JP6154614B2 - Rotary weighing device and zero-point fluctuation correction method for rotary weighing device - Google Patents

Description

  The present invention relates to a rotary weighing device and a zero-point fluctuation correcting method for the rotary weighing device, and more specifically, a rotary weighing device in which the weighing device rotates along a circumference, and the weighing device receives by rotation. The present invention relates to a zero point variation correction method for correcting variation in zero point weight due to a vibration signal caused by aerodynamic force or the like.

  As this type of weighing device, there is a weight sorter in which a plurality of weighing instruments are provided around a rotating body, and the weight supplied to the weighing instrument is measured while rotating the rotating body, and sorted by weight rank ( For example, see Patent Document 1).

  FIG. 21 is a schematic plan view of the weight sorter disclosed in Patent Document 1. In this rotary type weight sorter, a plurality of, for example, 16 loads S1 to S16 and loads for detecting the loads S1 to S16 are detected around the turntable 2 rotating around the rotation center O. A measuring instrument comprising a sensor 5 is provided, and is rotated integrally with the turntable 2 in the direction of arrow A (counterclockwise) at a predetermined rotational speed.

  The article 13 is placed on each placement area partitioned by a bar provided at a predetermined interval on the supply conveyor 4 that goes straight in the direction of the arrow B in synchronization with the rotational speed of the placement platforms S1 to S16. .

  The movement of one crosspiece is configured to be synchronized with the rotation movement of 1/16 of one of the platforms S1 to S16 rotating on the circumference around the rotation center O, and is mounted on one mounting area. The articles 13 are sequentially supplied onto one of the platforms S1 to S16.

  In FIG. 21, the platforms S <b> 1 to S <b> 16 to which the article 13 is supplied in the article supply range near the lower side of the supply conveyor 4 rotate in the direction of arrow A with the article 13 being placed. The arithmetic circuit (not shown) of the weight sorter waits for the transient response signal of the load signal from the load sensor 5 that detects the weight of the platforms S1 to S16 on which the article 13 is mounted to converge and stabilize, and then the platforms S1 to S1. S16 reads the stable load signal when it reaches the vicinity b immediately before the distribution position (1) for first distributing the article 13, and calculates the weight value of the article 13. The weight rank of the article 13 is determined based on the calculated weight value and a preset boundary weight value. Then, according to the determined weight rank, the articles 13 are discharged and shaken by opening the gates of the platforms S1 to S16 at the corresponding distribution positions (1) to (8) of the discharge range shown in FIG. Divide.

  Each weighing instrument has a zero point weight value that fluctuates due to a zero point drift of the load sensor 5 or the load signal measurement circuit or adhesion of foreign matter during operation. For this reason, during the operation, automatic zero adjustment is performed to correct the zero fluctuation. In this automatic zero adjustment, after the articles 13 on the platforms S1 to S16 of each weighing instrument are discharged at the above-mentioned sorting position (8) at the latest, the platform S1 up to the position before the next article 13 is supplied. The zero point weight value when S16 is unloaded is obtained, and the fluctuation from the zero point weight value at rest is corrected.

  A rotary weight filling device is known as a rotary weighing device different from such a rotary weight sorter (see, for example, Patent Document 2). The filling device includes a plurality of platforms arranged in the circumferential direction of the rotating body, and a load such as a load cell that is provided corresponding to each platform and detects the weight of the container placed on the platform. A plurality of measuring devices each including a sensor, and the weight of a container filled with a filling article such as a liquid is measured by the measuring device while the rotating body is rotating.

  This Patent Document 2 describes correction of a measurement error caused by centrifugal force generated by rotating a rotating body and aerodynamic force (wind pressure) due to the shape of a container.

  Even when the container is not loaded with a filled article, centrifugal force acts on the tare weight of the container, so the zero point weight value of the container will be affected by the centrifugal force according to the rotational speed, If the rotational speed is constant, this centrifugal force acts on the load signal at a constant magnitude at any position on the circular orbit where the container rotates, so that the zero point fluctuation amount of each container is constant at any position. is there.

  Further, in addition to the centrifugal force, even if the aerodynamic force (wind pressure) due to the shape of the container acts on the zero point weight value of the container, if the rotational speed is constant, this aerodynamic force is on the circular orbit where the container rotates. Since the load signal acts on the load signal at a constant magnitude at any position, the zero point fluctuation amount of each container is constant at any position.

  In other words, if the rotational speed is constant, the zero point fluctuation amount is constant at any position on the circular orbit, so the zero point weight value when the platform is unloaded is obtained, and the fluctuation from the zero point weight value when stationary is obtained. Minutes can be corrected.

JP-A-5-31464 JP 2004-333308 A

  In the rotary type weight sorter disclosed in Patent Document 1, a rectangular parallelepiped storage box containing a rotation drive mechanism for rotationally driving the turntable 2 to which the mounts S1 to S16 are attached is placed on the mounts S1 to S16. Is installed below it so as to occupy a part of the rotating circular orbit.

  22 and 23 are a schematic plan view and a schematic side view showing the installation position of the storage box 40 that stores the rotation drive mechanism. The rectangular parallelepiped storage box 40 is installed from the bottom of the turntable 2 so as to occupy a part of the circular orbit where the platforms S1 to S16 rotate and to extend outward.

  In this case, the distance D1 between the lower surface of the mounting table S5 that passes above the storage box 40 and the upper surface 40a of the storage box 40 is the floor surface 41 on which the lower surface of the other mounting table S13 and the storage box 40 are installed. Is much narrower than the distance D2. Therefore, at the timing when each of the platforms S1 to S16 passes above the storage box 40, an aerodynamic force acts downward on the platforms S1 to S16 due to the relative air flow caused by the rotational movement of the platforms S1 to S16. To do.

  Thus, if there is a part that disturbs the air flow in a part on the circular orbit, even if the rotational speed is constant, the aerodynamic force of the storage box 40 acts on the platforms S1 to S16, A vibration signal is generated at the output of the load sensor 5 of each of the platforms S1 to S16, and the magnitude of the vibration signal varies depending on the positions of the platforms S1 to S16 on the circular track. That is, the zero point fluctuation amount of the measuring instruments of the platforms S1 to S16 is not constant, and varies depending on the position.

  Therefore, after the article 13 is discharged at the distribution position (8) described above, the zero point weight value acquisition position before the next article 13 is supplied and the article 13 in the vicinity b immediately before the first distribution position (1). The magnitude of the amplitude of the vibration signal caused by the aerodynamic force of the storage box 40 acting on the platforms S1 to S16, that is, the zero point variation amount, differs from the weight value acquisition position.

  Apart from the zero point fluctuation caused by the presence of a part that disturbs the air flow in a part of the circular orbit like the above-mentioned storage box 40, for example, the rotation of the turntable 2 to which the mounts S1 to S16 are attached. When there is a part that causes vibration signal generation on the shaft or the like and the rotating platforms S1 to S16 are at specific positions on the circular orbit, a mechanical impact force is generated between the rotating shaft and the bearing mechanism. May generate a vibration signal, and in this case, each of the platforms S1 to S16 receives a mechanical impact force at the same timing when each of the platforms S1 to S16 is in a different position, The magnitude of the amplitude of the vibration signal differs for each of the platforms S1 to S16, that is, for each measuring instrument.

  The magnitude of the amplitude of the vibration signal due to such mechanical impact force acting on the measuring instrument varies depending on the position of the measuring instrument and also differs for each measuring instrument even if the rotational speed is constant. That is, the zero point fluctuation amount of the measuring instrument is not constant, and becomes a different value for each position of the measuring instrument and for each measuring instrument.

  As described above, the load signal acquired from the load sensor of the measuring instrument includes the vibration signal caused by the non-uniform aerodynamic force on the circular orbit rotating like the above-mentioned storage box 40 and the mechanical impact force. Mixed with vibration signals. Therefore, in order to accurately perform the zero point adjustment, it is necessary to remove the zero point fluctuation due to these vibration signals.

  The present invention has been made in view of the above points, and corrects the zero point fluctuation amount due to the vibration signal caused by the aerodynamic force and mechanical impact force received by the rotating measuring instrument, and accurately adjusts the zero point. The purpose is to be able to do it.

  In order to achieve the above object, the present invention is configured as follows.

(1) The rotary measuring device of the present invention includes a driving unit that rotates the measuring instrument along a circumference around the center of rotation, and the measuring instrument that supplies articles at the supply position on the circumference. A rotary weighing device for measuring the weight of the article based on the load signal of
Weight acquisition means for acquiring a weight value based on a load signal from the weighing instrument;
A stationary zero-point weight value based on a load signal from a weighing instrument that is in an unloaded state in which the article is not supplied and is acquired by the weight acquisition unit, and on the circumference by the weight acquisition unit The weight acquisition is performed using, as a zero-point fluctuation component, a difference from a dynamic zero-point weight value based on a load signal from the rotating measuring device in the no-load state acquired at a plurality of weight acquisition positions. Storage means for storing in advance for each position;
And zero point weight correction means for correcting the weight value acquired at the plurality of weight acquisition positions by the weight acquisition means for each weight acquisition position based on the zero point fluctuation component stored in advance in the storage means. ,
The storage means stores in advance a dynamic correction value for each weight acquisition position,
The dynamic correction value is a state in which a sample article having a known weight, which is acquired at the plurality of weight acquisition positions by the weight acquisition unit, is supplied to the measuring instrument, and from the rotating measuring instrument. An error between the dynamic weight value of the sample article based on the load signal of the dynamic weight value corrected based on the zero point fluctuation component by the zero point weight correction means and the known weight,
The zero-point weight correcting means converts the weight value corrected for each weight acquisition position based on the zero-point fluctuation component into the corrected weight value, the known weight, and the dynamic value stored in advance in the storage means. Further, the zero point weight correction means corresponds to the corrected weight value based on the corrected weight value and the known weight. Conversion to a dynamic weight correction value is performed, and the corrected weight value is further corrected based on the dynamic weight correction value .

  According to the rotary weighing device of the present invention, the zero weight value based on the load signal from the weighing instrument that is stationary in a no-load state in which no article is supplied, and no weight values acquired at a plurality of weight acquisition positions on the rotation circumference. The difference from the dynamic zero point weight value based on the load signal from the weighing instrument rotating in the load state is stored in the storage means in advance as a zero point fluctuation component, and at a plurality of weight acquisition positions based on the load signal from the rotating weighing instrument. Since the weight value to be acquired is corrected for each weight acquisition position by the zero point fluctuation component stored in the storage means, the zero point fluctuation due to the vibration signal caused by the aerodynamic force received by the rotating measuring instrument is corrected to be accurate. It is possible to perform zero point adjustment.

(2) In a preferred embodiment of the rotary measuring device of the present invention, a plurality of the measuring devices are provided,
The storage means is acquired at the plurality of weight acquisition positions by the weight acquisition means and the stationary zero-point weight value acquired by the weight acquisition means based on a load signal from the stationary weighing instrument in the unloaded state. The difference from the dynamic zero point weight value based on the load signal from the rotating measuring instrument in the no-load state is stored in advance as the zero point fluctuation component for each weight acquisition position and for each measuring instrument. And
The zero point weight correction unit is configured to calculate the weight value acquired at the plurality of weight acquisition positions by the weight acquisition unit based on the zero point fluctuation component stored in the storage unit in advance, and It corrects for each measuring instrument.

  The mechanical impact force acting when a plurality of measuring instruments are located at a specific position on the rotation circumference is different not only in the rotating position of the measuring instrument but also in each measuring instrument. As a zero fluctuation component, the difference between the static zero weight value based on the load signal from the weighing instrument that is stationary in a no-load state that is not supplied and the dynamic zero weight value based on the load signal from the rotating weighing instrument, Each weight acquisition position and each weighing instrument is stored in advance in the storage means, and the weight value based on the load signal from the rotating weighing instrument is stored in the storage means for each weight acquisition position and for each weighing instrument. Further, since the correction is made with the zero point fluctuation component, the zero point fluctuation due to the vibration signal caused by the aerodynamic force and the mechanical impact force received by the rotating measuring instrument can be corrected and an accurate zero point adjustment can be performed.

(3) In another embodiment of the rotary metering device of the present invention, the driving means rotates the meter at different rotational speeds,
The storage means is acquired at the plurality of weight acquisition positions by the weight acquisition means and the stationary zero-point weight value acquired by the weight acquisition means based on a load signal from the stationary weighing instrument in the unloaded state. The difference from the dynamic zero-point weight value based on the load signal from the rotating measuring instrument in the unloaded state is used as the zero-point fluctuation component for each weight acquisition position and for each measuring instrument. Is stored in advance according to the rotation speed of
The zero point weight correction unit is configured to calculate the weight value acquired at the plurality of weight acquisition positions by the weight acquisition unit based on the zero point fluctuation component stored in the storage unit in advance, and For each measuring instrument, correction is made according to the rotational speed.

  The aerodynamic force and mechanical impact force received by the rotating measuring instrument vary depending on the rotational speed, but according to this embodiment, the stationary zero-point weight value based on the load signal from the measuring instrument that is stationary in an unloaded state when no article is supplied. And the dynamic zero-point weight value based on the load signal from the rotating measuring instrument as a zero-point fluctuation component for each weight acquisition position and for each measuring instrument in advance according to the rotational speed. Since the weight value based on the load signal from the rotating measuring instrument is corrected for each weight acquisition position and for each measuring instrument according to the rotation speed, the zero point fluctuation component stored in the storage means is corrected. Accurate zero adjustment can be performed by correcting the zero fluctuation due to the vibration signal according to the magnitude of the rotational speed caused by the aerodynamic force and mechanical impact force received by the rotating measuring instrument.

  (4) In still another embodiment of the rotary weighing device of the present invention, the plurality of weight acquisition positions include a zero-point weight acquisition position for acquiring a zero-point weight value of the measuring instrument in the no-load state during operation, An article weight acquisition position for acquiring a weight value of the article supplied to the measuring instrument at the supply position.

  According to this embodiment, the plurality of weight acquisition positions include a zero-point weight acquisition position for acquiring a zero-point weight value of an unloaded weighing instrument in which an article is not supplied during operation, and a weight of the article supplied to the weighing instrument. It is possible to perform precise zero adjustment by correcting the zero point weight acquisition position and the zero weight fluctuation of the article weight acquisition position due to the aerodynamic force received by the rotating measuring instrument. It becomes.

(5) The zero point variation correction method of the rotary weighing device according to the present invention includes a driving unit that rotates the weighing instrument along a circumference around the rotation center, and the article is supplied at a supply position on the circumference. A zero-point variation correction method for a rotary weighing device that measures the weight of the article based on a load signal from the weighing instrument,
A first step of obtaining a stationary zero-point weight value based on a load signal from a weighing instrument that is in an unloaded state where the article is not supplied and is stationary during the adjustment operation;
A second step of acquiring a dynamic zero-point weight value based on a load signal from the rotating measuring instrument in the unloaded state at a plurality of weight acquisition positions on the circumference during the adjustment operation;
A third step of storing the difference between the acquired stationary zero point weight value and the dynamic zero point weight value of the plurality of weight acquisition positions as a zero point fluctuation component for each of the weight acquisition positions;
In the third operation, the dynamic weight value of the sample article based on the load signal from the rotating measuring instrument is in a state where a sample article of a known weight is supplied to the measuring instrument during the adjustment operation. A fourth step of acquiring the dynamic weight value of the sample article for each of the plurality of weight acquisition positions, corrected based on the zero point variation component stored in
A fifth step of storing, as a dynamic correction value, an error between the dynamic weight value of the sample article acquired in the fourth step and the known weight for each of the plurality of weight acquisition positions;
During operation, the weight value based on the load signal from the weighing instrument acquired at the plurality of weight acquisition positions is corrected for each weight acquisition position based on the zero point fluctuation component stored in the third step. And a sixth step
During the operation operation, the weight value corrected in the sixth step is determined for each weight acquisition position based on the corrected weight value, the known weight, and the dynamic correction value stored in the fifth step. And a seventh step of further correcting ,
In the seventh step, the dynamic correction value is converted into a dynamic weight correction value corresponding to the corrected weight value based on the corrected weight value and the known weight, and the dynamic weight correction value Based on the above, the corrected weight value is further corrected .

  According to the zero point variation correction method of the rotary weighing device of the present invention, during the adjustment operation, a stationary zero point weight value based on a load signal from a weighing machine that is stationary in a no-load state in which an article is not supplied, and a rotational circumference The difference from the dynamic zero-point weight value based on the load signal from the weighing instrument that rotates in the no-load state acquired at multiple acquisition positions is stored as a zero-point fluctuation component, and the load signal from the rotating measuring instrument during operation is stored. Because the weight value acquired at the plurality of acquisition positions based on the above is corrected with the stored zero-point fluctuation component for each weight acquisition position, the zero-point fluctuation due to the vibration signal caused by the aerodynamic force received by the rotating measuring instrument is corrected. Thus, accurate zero adjustment can be performed.

(6) In another embodiment of the zero point fluctuation correction method of the rotary weighing device according to the present invention, a plurality of the measuring devices are provided, and in the third step, the zero point fluctuation component is set for each of the weight acquisition positions, and For each weighing device, in the sixth step, a weight value based on load signals from the plurality of weighing devices acquired at the plurality of weight acquisition positions is based on the stored zero-point variation component, Correction is performed for each weight acquisition position and for each weighing instrument.

  The mechanical impact force acting when a plurality of measuring instruments are at a specific position on the rotation circumference is different not only in the rotating position of the measuring instrument but also in each measuring instrument. During operation, the difference between the zero point weight value based on the load signal from the weighing instrument that is stationary in an unloaded state when no article is supplied and the dynamic zero point weight value based on the load signal from the rotating weighing instrument is As a variable component, it is stored for each weight acquisition position and for each measuring instrument, and during operation, the weight value based on the load signal from the rotating measuring instrument is stored for each weight acquisition position and for each measuring instrument. Since the correction is made with the zero point fluctuation component, it is possible to perform an accurate zero point adjustment by correcting the zero point fluctuation due to the vibration signal caused by the aerodynamic force and mechanical impact force received by the rotating measuring instrument.

(7) In another embodiment of the zero point variation correction method of the rotary measuring device of the present invention, the driving means rotates the measuring instrument at different rotational speeds.
In the third step, the zero point fluctuation component is stored according to the rotation speed for each weight acquisition position and for each weighing instrument,
In the fourth step, the dynamic weight value of the sample article is acquired according to the rotation speed for each of the plurality of weight acquisition positions,
In the fifth step, an error between the dynamic weight value of the sample article acquired in the fourth step and the known weight is used as a dynamic correction value according to the rotation speed for each of the plurality of weight acquisition positions. Remember,
In the sixth step, a weight value based on load signals from the plurality of weighing devices acquired at the plurality of weight acquisition positions is determined for each of the weight acquisition positions based on the stored zero point fluctuation component. Correct according to the rotation speed,
In the seventh step, the weight value corrected in the sixth step is acquired based on the corrected weight value, the known weight, and the dynamic correction value stored in the fifth step. For each position, the correction is further performed according to the rotation speed .

  The aerodynamic force and mechanical impact force received by the rotating measuring instrument vary depending on the rotational speed, but according to this embodiment, during the adjustment operation, it is based on a load signal from a measuring instrument that is stationary in an unloaded state where no article is supplied. The difference between the stationary zero point weight value and the dynamic zero point weight value based on the load signal from the rotating measuring instrument is previously determined according to the rotational speed as a zero fluctuation component for each weight acquisition position and for each measuring instrument. Since the weight value based on the load signal from the rotating weighing instrument is corrected for each weight acquisition position and for each weighing instrument according to the rotation speed, the stored zero-point fluctuation component is stored. Accurate zero adjustment can be performed by correcting the zero fluctuation due to the vibration signal according to the magnitude of the rotational speed caused by the aerodynamic force and mechanical impact force received by the rotating measuring instrument.

  According to the present invention, the zero-point weight value based on the load signal from the weighing instrument that is stationary in an unloaded state where no article is supplied, and the movement based on the load signal from the rotating weighing instrument acquired at a plurality of weight acquisition positions. The difference between the initial zero point weight value is stored in advance as a zero point fluctuation component, and the weight value acquired at the plurality of weight acquisition positions based on the load signal from the rotating measuring instrument is stored for each weight acquisition position. Since the zero-point fluctuation component stored in is corrected, the zero-point fluctuation caused by the aerodynamic force or the like caused by the aerodynamic force that varies depending on the rotational position received by the rotating measuring instrument can be corrected and precise zero adjustment can be performed. .

FIG. 1 is a plan view showing a schematic configuration of a rotary weight sorter according to an embodiment of the present invention. FIG. 2 is a diagram showing a plurality of weight ranks and their boundary weight values. FIG. 3 is a diagram illustrating a configuration example of a memory table of zero fluctuation components. FIG. 4 is a block diagram showing a control configuration of the weight sorter. FIG. 5 is a diagram schematically illustrating a configuration example of a filter. 6A and 6B are diagrams showing the configuration of the pulse generator, where FIG. 6A is a plan view and FIG. 6B is a partially longitudinal side view. FIG. 7 is a diagram showing pulses, (a) is a reset pulse, and (b) is a timing pulse. FIG. 8 is a diagram showing the relationship between the system state and the position of the mounting table. FIG. 9 is a diagram showing the platform on which the weight is to be acquired and the output points of the filter to be acquired in each system state. FIG. 10 is a diagram showing a platform on which the necessity of driving the cylinder that opens and closes the gate is to be verified in each system state. FIG. 11A is a flowchart for explaining the operation, and is a flowchart showing the highest priority processing. FIG. 11B is a flowchart showing processing subsequent to FIG. 11A. FIG. 12 is a flowchart showing details of step n7 in FIG. 11A. FIG. 13 is a flowchart showing a process for acquiring a weight value between the central control unit and each measurement unit. FIG. 14A is a flowchart showing processing in the still measurement mode. FIG. 14B is a flowchart showing processing subsequent to FIG. 14A. FIG. 15 is a flowchart showing the dynamic weight value measurement process. FIG. 16 is a flowchart showing details of the process of step n406-1 (PG1 ′) in FIG. FIG. 17A is a flowchart showing the processing of the system state P1. FIG. 17B is a flowchart showing processing subsequent to FIG. 17A. FIG. 17C is a flowchart showing processing subsequent to FIG. 17B. FIG. 17D is a flowchart showing processing subsequent to FIG. 17C. FIG. 17E is a flowchart showing processing subsequent to FIG. 17D. FIG. 17F is a flowchart showing processing subsequent to FIG. 17E. Figure 18A is a flowchart corresponding to FIG. 15 of the implementation of the invention. FIG. 18B is a flowchart showing processing subsequent to FIG. 18A. FIG. 19A is a diagram illustrating details of the process of step n412-1 (PG1 ″) in FIG. 18B. FIG. 19B is a flowchart showing processing subsequent to FIG. 19A. FIG. 19C is a flowchart showing processing subsequent to FIG. 19B. FIG. 20A is a flowchart corresponding to FIG. 17A. FIG. 20B is a flowchart corresponding to FIG. 17B. FIG. 20C is a flowchart corresponding to FIG. 17C. FIG. 20D is a flowchart corresponding to FIG. 17D. FIG. 20E is a flowchart corresponding to FIG. 17E. FIG. 21 is a schematic plan view of a conventional example. FIG. 22 is a schematic plan view of a weight sorter showing the arrangement of a storage box that stores a drive mechanism. FIG. 23 is a schematic side view of the weight sorter showing the arrangement of the storage boxes.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a plan view showing a schematic configuration of a rotary weight sorter according to an embodiment of the present invention, and portions corresponding to the above-described conventional example of FIG. 21 are given the same reference numerals.

The weight sorter 1 of this embodiment includes a turntable 2 that rotates at a predetermined rotation speed in the direction of arrow A around the rotation center O, and rotates around the turntable 2 together with the turntable 2. A plurality of, in this example, 16 mounts S1 to S16 are provided, and on the turntable 2, a control box 8 containing a centralized control unit and the like to be described later is provided. Each loading table S1~S16 is supported by a lower portion of the turntable 2 by the load sensor 5 ₁ to 5 ₁₆ consisting of a load cell (LC) for detecting the load, each load platform S1~S16 and the load sensors 5 _{1 to} 5 ₁₆ constitute 16 measuring instruments.

  An article 13 such as a seafood or an agricultural product, such as a fish, is dropped and supplied from the supply conveyor 4 onto the platforms S1 to S16. In the supply conveyor 4, the placement areas on which the articles 13 are individually placed are partitioned at predetermined intervals by a crosspiece or the like, and the articles 13 are conveyed in the direction indicated by the arrow B. One of the rotating platforms S1 to S16 and one of the placement areas of the supply conveyor 4 operate in synchronism, and one article 13 placed on each placement area is supplied to the supply conveyor 4 Are sequentially supplied to the platforms S1 to S16 that have been rotated and moved to the supply position below the transfer terminal.

  In the article supply range shown in FIG. 1, the articles 13 supplied from the supply conveyor 4 to the platforms S1 to S16 are rotated while their weight values are measured at a plurality of weight acquisition positions as will be described later, and the measured weights are measured. The weight rank is determined based on the value and a preset boundary weight value.

Each meter during running operation, since the zero point weight value, such as by zero drift or foreign matter of the load sensor 5 ₁ to 5 ₁₆ and the load signal measurement circuit varies, on the platform S1~S16 each measuring instrument After the article 13 is discharged, the zero point weight value when the loading platforms S1 to S16 are unloaded is obtained at the position Iz before the next article 13 is supplied, and the zero point variation from the zero point weight at rest is corrected. Automatic zero adjustment is performed.

  In this embodiment, as shown in FIG. 2, based on the measured weight value Wx of the article 13 and the boundary weight values Wc1 to Wc7, the weight rank of the article 13 is set to eight weight ranks (1 ) To (8).

・ Wx <Wc1 Weight rank (1)
・ Wc1 ≦ Wx <Wc2 Weight rank (2)
・ Wc2 ≦ Wx <Wc3 Weight rank (3)
……………………………………………………………
・ Weight rank (7) when Wc6 ≦ Wx <Wc7
・ When Wc7 ≦ Wx Weight rank (8)
The articles 13 whose weight ranks are determined are placed on the platforms S1 to S16 at the distribution positions (1) to (8) corresponding to the determined weight ranks in the discharge range along the circumferential direction shown in FIG. The gate is opened and discharged and distributed.

  In the following description, the articles S1 to S8 from when the article 13 is supplied to the platforms S1 to S16 at the supply position until the articles 13 are allocated at the allocation positions (1) to (8) corresponding to the weight rank of the article 13 will be described. In the rotation path of S16, the upstream side in the rotational direction (side closer to the supply position) is referred to as the front side, and the downstream side in the rotational direction (side away from the supply position) is referred to as the rear side.

  In this rotary type weight sorter 1, as in the conventional example, as shown in FIGS. 22 and 23 described above, a rotational drive mechanism for rotationally driving the turntable 2 to which the respective platforms S1 to S16 are attached. The rectangular parallelepiped storage box 40 occupies a part of the circular orbit of the rotating platforms S1 to S16 and is installed below the storage box 40.

  Therefore, at the timing when each of the platforms S1 to S16 passes above the storage box 40, an aerodynamic force acts downward on the platforms S1 to S16 due to the relative air flow caused by the rotational movement of the platforms S1 to S16. To do.

  Since there is a part that disturbs the flow of air in a part of the circular orbit where the platforms S1 to S16 rotate in this way, even if the rotational speed is constant, the aerodynamic force of the storage box 40 is When a vibration signal is generated at the output of each measuring instrument of each of the platforms S1 to S16 by acting on S1 to S16, the magnitude of the amplitude of the vibration signal differs depending on the rotational position of the platforms S1 to S16. Become. That is, the zero point fluctuation amount from the stationary zero point weight of the platforms S1 to S16 is not constant and takes different values depending on the rotational position. In this case, since the aerodynamic force by the storage box 40 acts on each of the platforms S1 to S16 at the same position on the circular orbit, the zero point fluctuation amount due to the vibration signal generated by the aerodynamic force has a rotational position and a rotational speed. If they are the same, each of the platforms S1 to S16 has a common value.

  On the other hand, for example, a portion that causes generation of a vibration signal exists on the rotation shaft of the turntable 2 to which the respective mounts S1 to S16 are attached, and each of the mounts S1 to S16 is at a specific position on the circular orbit. Sometimes, when a mechanical impact force acts between the rotating shaft and its bearing mechanism to generate a vibration signal, the platforms S1 to S16 are the same when they are on different positions on the circular track. You will receive impact force at the timing. In this case, even if each of the platforms S1 to S16 is at the same position, the amplitude of the vibration signal varies depending on the platforms S1 to S16, so that the zero point variation amount differs for each platform S1 to S16, that is, for each measuring instrument. It will be.

  In this embodiment, the zero point fluctuation amount due to the vibration signal caused by such aerodynamic force and mechanical impact force is corrected so that the zero point adjustment can be performed accurately.

Further, in this embodiment, as in the prior art, when the platforms S1 to S16 reach the vicinity b immediately before the sorting position (1) where the article 13 is first sorted, the weight value of the article 13 is acquired only once. instead of, as each load platform S1~S16 reaches in front of the distribution position of each rank (1) to (7), the load signal from the load sensor 5 ₁ to 5 ₁₆ of each loading table S1~S16 Thus, the weights are respectively acquired to determine the weight ranks, and the articles 13 are respectively distributed at the distribution positions of the determined weight ranks.

  In this embodiment, as shown in FIG. 1, in order to determine the weight rank by acquiring the weight value of the article 13 in front of each distribution position and determine the weight rank according to the determined weight rank. .. 8 are virtually defined along the circumference of the platforms S1 to S16, which are sections that divide the semicircular circumference into eight equal parts. Since the mounting bases S1 to S16 are arranged along the circumference, each of the outer peripheral positions 1, 2, 3,... 8 is a section that can correspond to one mounting base.

  The outer peripheral position 1 is located one section ahead of the first distribution position (1), and the outer peripheral positions 2 to 8 are positions corresponding to the distribution positions (1) to (7), respectively.

  In FIG. 1, boundaries between the outer peripheral positions 1 to 8 are indicated by virtual extension lines d1 to d8, and intermediate positions at the outer peripheral positions 1 to 7 are indicated by virtual extension lines I1 to I7.

  In this embodiment, the position on the circumference for obtaining the weight value for determining the weight rank of the article 13 supplied from the supply conveyor 4 to the platforms S1 to S16 is the distribution position (1) of the article 13. The positions of the virtual extension lines I1, I2, I3,... The virtual extension lines I1, I2, I3,... I7 are arranged on the circumference at intervals of 1/16 of one round section of the rotation circumference of the platforms S1 to S16.

  Further, the zero point drift correction weight acquisition position for the zero point adjustment is discharged after the articles 13 on the platforms S1 to S16 of each measuring instrument at the above-mentioned sorting position (8) at the latest, and then the next article 13 is supplied. The position of the virtual extension line Iz, which is the front position, is set, and at this zero point drift correction weight acquisition position Iz, the zero point weight value when the loading platforms S1 to S16 are unloaded is acquired.

  Further, in FIG. 1, a position that is four sections ahead of the virtual extension line I1, which is a weight acquisition position for distributing the article 13 at the first distribution position (1) (one section is 1/16 the length of the circumference). This section) is assumed to be a virtual extension line I0. The virtual extension line I0 is a position in the vicinity where the article 13 is supplied.

  From virtual extension lines I0 to I1, from virtual extension lines I0 to I2,..., Each distance from virtual extension lines I0 to I7, that is, each distance given by a ratio to the circumference of one rotation of the platform, This is referred to as a weight measurement interval when the virtual extension lines I1, I2,.

  When a plurality of weight acquisition positions are provided at different positions on the circumference of the platforms S1 to S16 rotating in this way, even if the rotational speed is constant, the aerodynamic force by the storage box 40 described above causes the aerodynamic force of the platforms S1 to S1. If a vibration signal is generated by acting on S16, the magnitude of the amplitude of the vibration signal, that is, the zero point fluctuation amount from the stationary zero point weight becomes a different value depending on the respective weight acquisition positions I1 to I7, Iz.

  Further, when the rotating platforms S1 to S16 are at specific positions on the circular orbit, if the above-described mechanical impact force acts to generate a vibration signal, even if the rotational speed is constant, the vibration The magnitude of the amplitude of the signal, that is, the zero point fluctuation amount from the stationary zero point weight is different for each of the weight value acquisition positions I1 to I7 and Iz, and is also different for each of the platforms S1 to S16, that is, for each measuring instrument. Become.

  Each weighing instrument acquires the zero point weight value when the loading platforms S1 to S16 are unloaded at the zero point drift correction weight acquisition position Iz, and performs zero adjustment to correct the fluctuation from the zero point weight at rest. However, for each of the weight acquisition positions I1 to I7 and Iz, there is a zero point fluctuation amount due to the vibration signal caused by the aerodynamic force and the mechanical impact force. The zero point fluctuation amount is calculated for each of the weight acquisition positions I1 to I7 and Iz. Different.

  Therefore, in order to accurately perform the zero point adjustment, it is necessary to remove the zero point fluctuation amount due to the vibration signal at the zero point drift correction weight acquisition position Iz and the respective weight acquisition positions I1 to I7.

  Therefore, in this embodiment, in order to correct the zero point fluctuation amount due to the vibration signal caused by the aerodynamic force and the mechanical impact force, the following is performed.

  That is, in the adjustment operation at the time of no load in which the articles 13 are not supplied to the weighing platforms S1 to S16, the stationary zero point weight value based on the load signal from the weighing platforms of the stationary loading platforms S1 to S16, and the weight At the acquisition positions I1 to I7 and Iz, the difference from the dynamic zero point weight value based on the load signal from the weighing device of the rotating platforms S1 to S16 is used as the zero point fluctuation component for each rotation speed, and the weight acquisition positions I1 to I1 are used. In the operation operation in which each of I7, Iz and each measuring instrument is obtained and stored in the memory, and the article 13 is supplied to the weighing platforms S1 to S16 to select the weight, the set rotational speed and weighing are set. And zero point fluctuation components corresponding to the weight acquisition positions I1 to I7, Iz are read from the memory, and the weight value based on the load signal from the measuring instrument acquired at the weight acquisition positions I1 to I7, Iz is Variable component It is to be corrected.

  Specifically, correction of the zero point fluctuation amount for each rotation speed, each weighing instrument, and each weight acquisition position is performed by the following procedures (1) to (4).

(1) Measurement of stationary zero point weight value of each measuring instrument To detect the zero point fluctuation that appears by rotating each measuring instrument in the no-load state, It is necessary to adjust the stationary zero point. For this reason, the stationary zero point weight value for each measuring instrument is measured.

  Since the stationary zero point weight value Wzs0 <s> at the time of non-rotating in a no-load state differs for each measuring instrument, the stationary zero point weight value is measured for each measuring instrument, and the stationary zero point weight value storage register Wrzs0 < s>, (s = 1 to 16). In addition, s shows the numbers 1-16 of each measuring instrument corresponding to each mounting base S1-16.

  The measurement of the stationary zero point weight value is performed by turning off the operation switch of the input unit 24 of the display setting unit 21 described later in an unloaded state where the articles 13 are not supplied to the platforms S1 to S16. Set to the stationary measurement mode that does not rotate the measuring instrument. As a result, the weight sorter 1 reads the load signal for each weighing instrument from the output of the stationary clock amount filter having the same filter characteristics as described later to obtain the stationary zero weight value Wzs0 <s> for each weighing instrument, Store in the stationary zero-point weight value storage register Wrzs0 <s>, (s = 1 to 16).

(2) Static zero-point adjustment of each measuring instrument This static zero-point adjustment is performed by the static zero-point weight value Wzs0 <s stored in the static zero-point weight value storage register Wrzs0 <s> (s = 1 to 16) in (1) above. s>.

Specifically, the zero adjustment switch of the input unit 24 of the display setting unit 21 is operated after confirming that the article 13 is not placed on any of the weighing platforms S1 to S16. When the operator operates, in all the measuring instruments, a calculation formula for calculating the weight value, for example, a measuring instrument of the mounting table S1,
Wn1 = K1. (Wa1-Wi1) -Wz1
The stationary zero point weight Wz1 in is replaced with the stationary zero point weight value Wzs0 <s> stored in the stationary weight value register Wrzs0 <s>, (s = 1 to 16). The calculation formula will be described later.

(3) Measurement of zero-point fluctuation component at the time of measuring instrument rotation and registration of zero-point fluctuation component in table memory Dynamics at the rotational speed used for operating operation when each of the platforms S1 to S16 is unloaded. The zero point weight value is acquired for each measuring instrument and for each weight acquisition position as follows and stored in the memory as a zero point fluctuation component. For the dynamic weight value, filters having different filter characteristics are used according to the weight acquisition position, as will be described later.

  In this embodiment, 16 measuring instruments s = 1 to 16 corresponding to the mounting platforms S1 to S16 are provided, and the rotation speed v can be set in 11 stages of v = 1 to 11. . Further, the weight acquisition positions of the article are seven positions I1 to I7 as described above, and the acquisition position of the zero-point drift correction weight value is one position Iz. The eight weight acquisition positions i including the weight acquisition positions I1 to I7 and the zero drift correction weight value acquisition position Iz of the article are represented as i = 1 to 7 and z.

  When the measuring instrument of the measuring instrument number s is rotated at the rotational speed v in an unloaded state where no article is supplied, the weight value acquired at the weight acquisition position i is expressed as the dynamic zero point weight value Wzd <s, v, i. It is expressed as>.

  During the adjustment operation, the rotating speed of each stage v = 1 to 11 is given in order during the rotating operation of the measuring instrument to rotate the measuring instrument for each rotating speed in an unloaded state, and for all the measuring instruments s = 1 to 16, respectively. The weight value at the article weight acquisition positions I1 to I7 (i = 1 to 7) and the zero point drift correction weight acquisition position Iz (i = z), that is, the dynamic zero point weight value Wzd <s, v, i>. get.

  In order to reduce the variation in weight measurement, the dynamic zero point weight which is an unloaded weight value for each weight acquisition position i for each weighing instrument s by rotating more than once (R times), for example, 5 times or more. R or more values Wzd <s, v, i> are obtained, the average value thereof is calculated, and the difference between the average value and the stationary zero-point weight value Wzs0 <s> for each measuring instrument s is calculated to obtain a zero fluctuation component. Let Czd <s, v, i>.

  These zero-point fluctuation components Czd <s, v, i> are stored in a table memory for each measuring instrument s, rotational speed v, and weight value acquisition position i.

  For example, a memory table is provided for each rotation speed in 11 stages from v = 1 to 11, and in each table, for example, for v = 1, as shown in FIG. Are registered as zero-point fluctuation components Czd <s, v, i> in the two-dimensional memory registers of the respective weight value acquisition positions i = 1 to 7 and z including the zero-point drift correction weight acquisition position.

  In the measurement of the zero point fluctuation component, the operator sets the rotation speed v at the input unit 24 of the display setting unit 21 described later, and turns on the operation switch. As a result, the dynamic weight measurement mode is set, and the measuring instrument rotates at the set rotation speed.

  Furthermore, when the operator confirms that no load is being supplied to the weighing instrument and the dynamic zero point fluctuation component detection mode switch is turned on, the dynamic zero point fluctuation component detection mode is set, and all the weighing instruments are set. For s = 1 to 16, dynamic zero point weight values Wzd <s, v, i> are acquired at weight acquisition positions i = 1 to 7, z (I1 to I7, Iz), and R average values are calculated. Then, the difference between the average value and the static zero point weight value Wzs0 <s> for each measuring instrument s is taken and registered in the memory as the zero point fluctuation component Czd <s, v, i>.

(4) Correction of Zero Fluctuation Amount During Operation Operation A measuring instrument that rotates at a set rotation speed v during operation operation in which the article 13 is supplied to each of the platforms S1 to S16 in the article supply range and sorted by gravity rank. The weight value of the article 13 placed on the platforms S1 to S16 of s is acquired at each weight acquisition position i. If the acquired weight value is Wxd <s, v, i>, the weighing instrument s The zero point fluctuation component Czd <s, v, i> corresponding to <s, v, i> which is the rotational speed v and the weight acquisition position i is called from the registered memory and subtracted as follows.

Wxd <s, v, i> −Czd <s, v, i>
Thereby, it is possible to cancel the zero point fluctuation amount due to the vibration signal caused by the aerodynamic force and the mechanical impact force, which is included in the weight value acquired during the operation operation.

  Next, the control configuration of the weight sorter 1 of FIG. 1 will be described based on the block diagram of FIG.

Analog load signal of the load sensor 5 ₁ to 5 ₁₆ for detecting a load of the load platform S1~S16 above respectively, are input to the respective measurement units ₆₁ through _16.

Each of the measurement units 6 _{1 to} 6 ₁₆ amplifies the analog load signal output from the load sensors 5 _{1 to} 5 ₁₆ and also includes an amplifier 7 incorporating an analog filter for removing high frequency noise, an arithmetic circuit 9, And a serial controller 10.

  The arithmetic circuit 9 includes an A / D converter (not shown) that converts an analog load signal output from the amplifier 7 into a digital load signal, and converts the A / D converted load signal into a dynamic weight value. At the time of acquisition, a CPU and a memory (not shown) that perform filtering according to the weight acquisition position are provided as will be described later.

16 units load signals generated by the respective measurement unit ₆₁ through ₁₆ of the serial centralized control unit 11 from the serial controller 10 provided in each of the measuring units ₆₁ through ₁₆ via a serial line SL1 It is sent to the controller 12.

The centralized control unit 11 includes a CPU (not shown) and a calculation control circuit 18 including a memory for storing the above-described table for the zero point variation and the like. The calculation control circuit 18 constitutes a pulse generator. A timing pulse Tp and a reset pulse Rp are given from an after-mentioned first and second photosensors PH1 and PH2 via an I / O circuit 16, and based on these pulses Tp and Rp, the rotational positions of the platforms S1 to S16 Recognize The central control unit 11 as a weight acquisition means collects the load signals of all the platforms S1 to S16 from the measurement units 6 _{1 to} 6 ₁₆ and measures the weight at a predetermined timing, that is, acquires the weight value. To do.

  Further, the arithmetic control circuit 18 of the central control unit 11 as the zero point weight correction means acquires the weight value, corrects the zero point fluctuation component, determines the weight rank based on the corrected weight value, and corresponds to the weight rank. In order to distribute the articles 13 at the distribution position, the driving of the cylinders cy1 to cy16 that opens and closes the gates of the platforms S1 to S16 via the I / O circuit 16 is controlled. Further, the arithmetic control circuit 18 of the centralized control unit 11 controls a motor 19 as a driving means via the I / O circuit 16 and the motor drive circuit 17, and thereby the rotation table 2 driven to rotate by the motor 19. The rotation speed is controlled to the set rotation speed.

  The arithmetic control circuit 18 of the central control unit 11 transmits the weight value corrected for the zero point fluctuation component, the determined weight rank, and the like to the display setting unit 21 outside the rotating body via the serial controller 20 of the central control unit 11. In the display setting unit 21, the data is received by the serial controller 22 via the serial line SL2.

  Communication between the central control unit 11 on the rotation side and the display setting unit 21 on the fixed side is performed by a rotary connector (not shown), and the power supplied to the display setting unit 21 side is for power supply (not shown). Power is supplied to the central control unit 11 side through the slip ring.

  The display setting unit 21 includes an arithmetic control circuit 23 including a CPU and a memory (not shown), a boundary weight value for determining a weight rank, a rotation speed, and the like, and various switches for correcting a zero variation component. An input unit 24 provided, a display unit 25 for displaying data sent from the centralized control unit 11, and an I / O circuit 26 are provided.

In this embodiment, as described above, each time the platforms S1 to S16 reach before the distribution positions (1) to (7) of the respective weight ranks, the load sensors 5 _{1 of the} platforms S1 to S16. based on the load signal from 5 _16, after correcting the zero point fluctuation component by measuring the weight, respectively, to determine the weight classes in the distribution position of the determined weight classes so distributes the articles 13, respectively, sorting position ( Among the items 1) to (7), the weight rank of the article that is distributed on the rear side is measured at the measurement position on the rear side, and the weight rank is determined. Therefore, as the article of the weight ranks of the rear side, the longer it takes until the article 13 is to measure the weight from being supplied to the load platform S1 to S16, the transient response of the load signal from the load sensor 5 ₁ to 5 ₁₆ Is smaller and converges and stabilizes, and the weight value can be obtained using a long time load signal.

In this embodiment, each of the measurement units 6 _{1 to} 6 ₁₆ is configured to acquire weight values using filters having different response times according to the weight acquisition positions, that is, filters having longer response times at the rear weight acquisition positions. It is composed.

Next, the configuration of the filter of the measuring unit ₆₁ through _16.

  This weight sorter 1 can be metered by setting various rotational speeds. Hereinafter, v is used when the rotation speed is expressed in 11 stages of 1 to 11 described above, and V is used when the rotation speed is expressed in rotations per minute (rpm).

  First, since the rotation speed (v = 1 stage) at the minimum weighing capacity is V = 10 rpm, 16 mounting platforms S1 to S16 rotate per rotation, the article 13 is mounted on all the mounting platforms S1 to S16. If it can be placed, the weighing capacity will be a rotation speed corresponding to 160 pieces / min.

  Further, assuming that the rotation speed (v = 11 stage) at the maximum weighing capacity is V = 20 rpm and the article 13 can be placed on all of the platforms S1 to S16, the weighing capacity is 320 pieces / minute. The rotation speed is equivalent to

  The rotation speed is set directly as the rotation speed per minute, or as the value of the weighing processing capacity per minute when the article 13 can be placed on all the platforms S1 to S16 indirectly.

In this embodiment, each measuring unit ₆₁ through _16, but the fixed filter and a variable filter for filtering the load signal converted A / D is provided, it will be described first fixed filter.

FIG. 5 schematically shows a shift register provided in each arithmetic circuit 9 of each of the measurement units 6 _{1 to} 6 ₁₆ and a block configuration of arithmetic processing.

Here, by the case of the article 13 when the rated capacity of the article 13 is not placed on the platform S1~S16 is placed, comprises a mounting base S1~S16 and load sensor 5 ₁ to 5 ₁₅ It is assumed that the natural frequency of the measuring instrument changes between 30 and 33 Hz.

The arithmetic circuit 9 of each of the measurement units 6 _{1 to} 6 ₁₆ corresponding to each of the platforms S1 to S16 includes an A / D conversion circuit 27 that converts the analog load signal output from the amplifier 7 into a digital load signal. I have. The A / D conversion circuit 27 converts the analog load signal into a digital load signal at a sampling interval of 1 msec, for example.

  The arithmetic circuit 9 is provided with a first shift register SFR1 composed of 30 serial cell registers. Each cell register stores one A / D sampling data that has been A / D converted by the A / D conversion circuit 27.

  Each time one A / D sampling data which is a measured value of the load signal is newly obtained from the A / D conversion circuit 27 every 1 msec, the cell register data is sequentially shifted to the right in FIG. By discarding one A / D sampling data at the right end and inputting the latest A / D sampling data, the latest 30 A / D sampling data are always stored.

  Further, every time one new A / D sampling data is stored in the first shift register SFR1, the average value of the latest 30 cell register data stored in the first shift register SFR1 It is calculated by the average value arithmetic circuit (AV1) 30 and given as input data to the second shift register SFR2.

  The second shift register SFR2 includes 33 serial cell registers, and is connected to the next stage of the first average value arithmetic circuit (AV1) 30.

  Each time the average value is newly calculated by the first average value arithmetic circuit (AV1) 30 at an interval of 1 msec, the second shift register SFR2 sequentially shifts the data in the cell register one by one in the right direction in FIG. The latest average value for 33 is always stored and the oldest average value at the right end is discarded.

  Each time a new average value is stored in the second shift register SFR2 at an interval of 1 msec, the second average value calculation circuit (AV2) 31 in the next stage is connected to the latest 33 of the second shift register SFR2. The average value of the cell register outputs is calculated.

  The first and second average value calculation circuits (AV1, AV2) 30, 31 and the first and second shift registers SFR1, SFR2 are not specially provided, and the average calculation data in the calculation circuit 9 is not provided. This is a schematic representation of the flow and calculation, and is executed in the CPU and the memory connected to the CPU.

  The first shift register SFR1 composed of 30 cell registers and the first average value arithmetic circuit (AV1) 30 serve as a notch filter for a noise signal having 30 msec as one cycle, and the second shift register SFR2 composed of 33 cell registers. The second average value calculation circuit (AV2) 31 becomes a notch filter for a noise signal having one cycle of 33 msec, and becomes a double notch filter.

The double notch filter is a filter for the natural vibration noise removal meter comprising a load platform S1~S16 and load sensor 5 ₁ to 5 _15, when a load signal includes a noise signal 30～33Hz, namely When one period includes vibration noise of 33 msec to 30 msec, a large damping effect is obtained.

  The supply position of the article 13 on the circumference varies depending on the difference in the mounting state of the article 13 on the supply conveyor 4 and the stickiness.

  In this embodiment, in the case of the rotational speed at the maximum weighing capacity, the platforms S1 to S16 after the article 13 is supplied on the platforms S1 to S16 are the positions of the virtual extension line I0 in FIG. The time to reach is set to a response time of the double notch filter of 63 msec or more. That is, the position of the virtual extension line I0 corresponds to the positions of the platforms S1 to S16 after 63 msec or more have elapsed since the article 13 was supplied the latest on the platforms S1 to S16 in the case of the rotational speed at the maximum weighing capacity. The position to reach.

  As another embodiment of the present invention, the position at which the article is supplied latest on the platforms S1 to S16 is set as the position of the virtual extension line I0, and thereafter, the process until the article reaches the virtual extension line I1. The response time of the natural vibration noise removing filter may be expected within 63 msec.

Since this double notch filter, it is an object of the smoothing of the natural vibration noise meter with a load platform S1~S16 and load sensor 5 ₁ to 5 _15, rotation speed and weight of the platform S1~S16 It is necessary to provide regardless of the acquisition position of the value.

Note that, the gate of the platform S1 to S16, when the gate mounting brackets, so-called, such as a cylinder for the gate opening and closing, tare weight applied to the load sensor 5 ₁ to 5 ₁₆ is sufficiently large relative to the weight of the article, the platform Since the change in the natural vibration period of the measuring instrument due to the presence or absence of articles on S1 to S16 is small, only one notch filter may be provided in the double notch filter.

  Next, in addition to the above-described notch filter that is a fixed filter, a variable filter that changes the smoothing characteristic according to the rotational speed of the turntable 2 and the weight acquisition position will be described.

  The platforms S1 to S16 are moved in accordance with the rotational movement from the virtual extension line I0 to I1, I2,... I7 in FIG. 1, virtual extension lines I01 to I1, virtual extension lines I0 to I2, virtual extension lines I0 to I3, ... the virtual extension lines I0 to I7 and the weight measurement interval gradually increase, and the required time gradually increases at the same rotational speed.

  In this embodiment, a filter is provided for each of the virtual extension lines I1, I2, I3,... I7, depending on the value of the rotation speed and their weight acquisition positions, that is, the respective weight acquisition positions from the position of the virtual extension line I0. A filter having a large or small response time, that is, a variable filter having a large and small smoothing characteristic, is applied according to the time required for moving the platforms S1 to S16.

  As a result, a filter having a greater smoothing characteristic is applied to the load signal at the rear weight acquisition position on the rotation circumference of the platforms S1 to S16 so that an accurate weight value can be acquired.

  First, when the rotation speed is the highest, that is, when the maximum rotation speed (v = 11 stage) V = 20 rpm, the time required for one rotation is 3 seconds. Since the required time per section of 1/16 of one round is 3000/16 = 187.5 msec, in FIG. 1, the platforms S1 to S16 are 4 from the position of the virtual extension line I0 to the position of the virtual extension line I1. The required time for moving the section is 187.5 msec * 4 = 750 msec. Further, it is necessary to move through the sections of the virtual extension lines I1 to I2, the virtual extension lines I2 to I3, the virtual extension lines I3 to I4, the virtual extension lines I4 to I5, the virtual extension lines I5 to I6, and the virtual extension lines I6 to I7. The time is 187.5 msec.

  On the other hand, in the case of the minimum rotation speed (v = 1 stage), since the required time is doubled, the platforms S1 to S16 move for four sections from the position of the virtual extension line I0 to the position of the virtual extension line I1. Is 375 msec * 4 = 1500 msec. Further, it is necessary to move through the sections of the virtual extension lines I1 to I2, the virtual extension lines I2 to I3, the virtual extension lines I3 to I4, the virtual extension lines I4 to I5, the virtual extension lines I5 to I6, and the virtual extension lines I6 to I7. The time is 375 msec.

  Since the time required for the article 13 to move in each section may be expected as the response time by the filter, first, in the weight measurement interval from the virtual extension lines I0 to I1, the maximum rotational speed is 750 msec, and the minimum rotational speed is Can expect 1500 msec. Since these times can be estimated as the maximum value of the filter response time in setting the filter, they are called allowable response times.

  The allowable response time from the virtual extension line I0 to each virtual extension line I2, I3,... I7 increases by 187.5 msec at the maximum rotation speed and by 375 msec at the minimum rotation speed.

  That is, a filter having a response time corresponding to an allowable response time that differs depending on whether the rotation speed is maximum or minimum can be cascade-connected to the fixed filter (notch filter).

  As a general expression, when the rotation speed Vrpm is given, the time required for one rotation is (60 / V) sec. Therefore, the required time per 1/16 section (= 1 section) is (60 · V). ) * (1/16) = (15/4) * (1 / V) sec = (3750 / V) msec, and the virtual extension lines I0 to I1 are 4 sections, so that the allowable response time is (15000 / V) msec can be expected.

  The virtual extension lines I1 to I2, the virtual extension lines I2 to I3,..., The virtual extension lines I6 to I7, and the required time for each section, 187.5 msec at the maximum rotation speed, 375 msec at the minimum rotation speed, In general, in the case of Vrpm, the required time is (3750 / V) msec. Therefore, the allowable response time is increased by (3750 / V) msec at the virtual extension lines I2, I3,. .

  The response time of the filter provided per section after the virtual extension line I1 can be increased in increments of (3750 / V) msec in anticipation of a longer time load signal at the rear position. Even if a vibration signal is generated, the smoothing characteristic with respect to vibration noise can be increased at the output point of the filter corresponding to the measurement position at the rear position on the circumference, and a more stable weight value can be acquired.

  As an example of the variable filter, a case where an average value filter is used will be described.

  In the second shift register SFR2 and later constituting the fixed filter of FIG. 5, the average value of the second shift register SFR2 is obtained at intervals of 1 msec, whereas many cell registers are serially arranged taking up the average value of intervals of 10 msec. The average value is stored in the connected third shift register SFR3.

  The method of storing data in the third shift register SFR3 is the same as that of the first and second shift registers SFR1 and SFR2. First, the data in each cell register is sequentially shifted to the right by one and then the second shift register. Store the new data obtained from SFR2. This operation is performed at 10 msec intervals.

  This is because the vibration noise removed by the variable filter has a relatively small frequency compared to the natural frequency of the measuring instrument, that is, the period is long, so a lot of memory necessary to store the load signal for a long time is used. The shift processing time can be shortened.

  As another embodiment, a large number of memories may be used to store a load signal every 1 msec.

  When the rotation speed of the weight sorter 1 is set to the minimum value of 10 rpm, the cell registers constituting the third shift register SFR3 are prepared in a number sufficient to correspond to the minimum rotation speed. FIG. 5 shows a configuration corresponding to this minimum rotation speed of 10 rpm.

  One cell register data is sequentially shifted to the right in FIG. 5 every 10 msec, and the data is stored from the leftmost cell register having the output point I0. Therefore, in the case of the minimum rotation speed, the response time is 1500 msec. As a shift register up to the output point I1, 150 cell registers are connected.

  Furthermore, since the response time of 370 msec is expected up to the output point I2, 37 cell registers are connected. Since the same response time is expected until the output points I3, I4, I5, I6, and I7, 37 cell registers are connected in series, and a total of 150 + 37 * 6 = 372 cell registers are connected in series.

  These registers are configured in the RAM of the arithmetic circuit 9.

  On the other hand, when the maximum rotational speed is 20 rpm, the response time must be advanced, and the number of cell registers up to the output point I1 with a response time of 750 msec as described above is 75. In addition, since the number of cell registers prepared for each interval between the output points I2, I3,... I7 may be 18, a total of 75 + 18 * 6 = 183 cell registers are connected in series.

  When a rotational speed of, for example, 15 rpm is set between the rotational speeds of 10 rpm and 20 rpm, the number of cell registers connected in inverse proportion to the rotational speed is determined.

As a method of determining the number of connection registers, generally when a rotation speed, for example, 18 rpm is set,
Speed ratio: (20-18) / (20-10) = 1/5
The number of registers up to the output point I1 is 75+ (150−75) * (1/5) = 90.
The number of cell registers between the output points I1 to I2,..., And the output points I6 to I7 is 18+ (36-18) * (1/5) = 21 (the number after the decimal point is rounded down), and the total is 21 *. 6 = 126 is determined.

  As a general formula, when the value of the rotation speed V is set, the value of the rotation speed V may be replaced instead of the rotation speed 18 rpm. As the number of shift register cell registers is increased, the average value of sampling values for a long-time load signal is obtained. Therefore, as a filter, the smoothing characteristic for a long-period vibration signal is generally increased, and various shorter short-circuit values are obtained. Smoothness characteristics for periodic vibration signals are also increased.

  A filter that obtains an average value with a larger numerical value has a longer response time, but it can obtain a large smoothing characteristic for floor vibration that occurs suddenly at a weight measurement interval, and a smoothing characteristic for a transient response vibration signal is also large. .

  Next, setting of filter conditions will be described.

The rotation speed V is set from the input unit 24 of the display setting unit 21 in FIG. 4, and the measurement units 6 _{1 to} 6 ₁₆ corresponding to the platforms S _{1 to S 16} from the display setting unit 21 via the central control unit 11. Is provided via the serial line SL1.

When the rotational speed V is given, each of the measurement units 6 _{1 to} 6 ₁₆ performs the above calculation, and the number of cell registers corresponding to the rotational speed V and the memory address corresponding to the number are determined.

  Note that the value of the rotation speed V is not necessarily the set value itself, but the central control unit 11 measures the generation time interval between the reset pulse Rp and the timing pulse Tp from the first and second photosensors PH1 and PH2. It is good also as a rotational speed calculated based on the recognized generation time interval.

  Next, designation of the output point to the filter and output of the weight value from the filter will be described.

As shown in FIG. 1, in order to obtain the weight value of the filter in the vicinity of the positions of the virtual extension lines I1, I2,... I7 according to the rotational movement on the circumference of the platforms S1 to S16, these positions are obtained. to when the load platform S1 to S16 is reached, gives a read command of data of the filter as will be described later, the measurement unit ₆₁ through ₁₆ corresponding the central control unit 11 to a predetermined load platform S1 to S16.

  For example, assuming that the metering operation is performed at the rotational speed V = 10 rpm, the output point I1 is designated from the central control unit 11 to the corresponding measurement unit at the timing of obtaining the weight value at the position of the virtual extension line I1. When both the code to be placed and the platform number are given, the measurement unit corresponding to the platform of the designated number interprets this and each of the 150 cell registers from the output points I0 to I1 shown in FIG. Is calculated by the third average value calculation circuit (AV3) 32, and the set data of the data content code indicating the weight value, the mounting number and the average value is obtained via the serial controller 10. The acquired weight value is sent to the central control unit 11.

  If the position of the output point I2 is designated as the weight value for reading, the average value of the outputs of 150 + 37 = 187 cell registers between the output points I0 to I2 is calculated as the third average value arithmetic circuit (AV3) 32. And is sent to the central control unit 11 as an acquired weight value.

  Similarly, the acquired weight value is output up to the output point I7.

  For example, the output of the second average value calculation circuit (AV2) 31 is used as the output of the filter that acquires the zero point weight at the zero point drift correction weight acquisition position Iz.

 Further, in the stationary measurement mode in which the platforms S1 to S16 are not rotated, the filter characteristics of the respective weight acquisition positions I1 to I7 and Iz are common, and for example, the second average value calculation is performed for all the weight acquisition positions I1 to I7 and Iz. The output Iz of the circuit (AV2) 31 is used.

  As described above, the weight value that has passed through the filter having a larger smoothing characteristic is acquired and transmitted to the centralized control unit 11 as the positions of the mounting platforms S1 to S16 are in the rearward direction.

  Next, control in the central control unit 11 will be described.

  First, the creation of a system state for recognizing where each of the platforms S1 to S16 is located will be described.

  As shown in FIG. 1, the central control unit 11 outputs the filter output point corresponding to the weight acquisition position as described above at any one of the outer peripheral positions 1 to 7 for each of the platforms S1 to S16 rotating on the circumference. The weight value is acquired from the table, the zero point fluctuation of the acquired weight value is corrected, the weight rank is determined based on the corrected weight value, and the articles on the platforms S1 to S16 are allocated at the distribution position corresponding to the determined weight rank. Control to divide.

  The central control unit 11 recognizes the positions of the platforms S1 to S16 on the rotation circumference by the pulses from the pulse generator shown in FIGS. 6A and 6B, and on the circumference of the platforms S1 to S16. Create a system state corresponding to the location of.

  1 is supported by a column 28 provided at the rotation center O, and the columns 28 are also rotationally driven by the motor 19 described above, so that the platforms S1 to S16 are also rotationally driven. Is done.

  An optical sensor bar 29 is attached to the column 28, and the optical sensor bar 29 rotates around the rotation center O together with the column 28.

  A first photosensor PH1 composed of a light projecting / receiving element for generating a timing pulse Tp and a second photosensor PH2 composed of a light projecting / receiving element for generating a reset pulse Rp are attached to the tip of the optical sensor bar 29, and a fixing portion 37 is attached. Is attached with an annular ring 35. This annular ring 35 is provided with 16 timing pulse generation slits 33 at positions that divide the circumference into 16 equal parts, of which the timing pulse generation slit 33 overlaps the angle with one timing pulse generation slit 33. A reset pulse generating slit 34 that is slightly wider than the slit 33 is provided.

  When the mounting platforms S1 to S16 and the optical sensor bar 29 rotate, as shown in FIG. 7B in synchronization with the rotation of the mounting platforms S1 to S16, 16 timing pulses Tp generated per one rotation of the optical sensor bar 29; As shown in FIG. 7A, one reset pulse Rp generated per rotation of the optical sensor bar 29 is generated and read by the central control unit 11.

  The pulse width pwr of the reset pulse Rp is wider than the pulse width pwt of the timing pulse Tp. The central control unit 11 includes a clock pulse generation circuit that generates a pulse signal whose period is sufficiently shorter than the timing pulse width pwt. The reset pulse Rp and the timing pulse Tp are read by the arithmetic control circuit 18 of the central control unit 11 by the interrupt processing program having the highest priority activated by the pulse signal from the clock pulse generation circuit.

  The annular ring 35 is installed on the fixing portion 37 of the main body so that the line a in the annular ring 35 of FIG. 6 substantially overlaps the position of the line d1 shown in FIG. The optical sensor bar 29 is provided so as to overlap the position of the end g on the rotation advance side of the mounting table S1 in FIG.

  Then, when the end portion g on the rotation advance side of the mounting table S1 reaches the position of the line d1, the timing of generating the reset pulse Rp and the timing pulse Tp1 in FIGS. 7A and 7B is reached. Thereafter, the end g on the rotation advance side of the mounting table S1 reaches the line d2, the mounting table S1 completely overlaps the outer peripheral position 1, and the timing pulse Tp2 is generated by the next timing pulse generating slit 33. A state until the timing pulse Tp2 is generated is defined as a system state P1.

  Further, after the generation of the timing pulse Tp2, the stage S1 is completely overlapped with the outer peripheral position 2, and the timing pulse Tp3 is generated by the next timing pulse generating slit 33. The state until this timing pulse Tp3 is generated Is defined as a system state P2.

  Similarly, every time the timing pulses Tp3, Tp4,... Tp16... Are generated, the system state P3, P4,.

  In this way, the system state proceeds every time the timing pulse Tp is generated while the platforms S1 to S16 and the optical sensor bar 29 rotate around the circumference, and proceeds to the system states P1 to P16, and again the system state P1. Return to and repeat.

  In FIG. 7, when each system state is started, a time point (1) for designating an output point of a filter for obtaining a weight value of a predetermined stage, a time point (2) for reading the weight value of the designated output point, A time point (3) at which the weight rank is determined and the distribution signal is held (3) and a time point (4) at which the gate opening / closing cylinders of the platforms S1 to S16 are driven by the held distribution signal are also shown.

  When the system state starts, the central control unit 11 has a first predetermined time shown in FIG. 7, which is the time when the platforms S1 to S16 reach the positions of the virtual extension lines I1, I2,... I7, Iz in FIG. At time point (1) when time T01 (msec) has elapsed, an output point is designated in order to obtain a weight value from a predetermined filter output point of a measurement unit corresponding to a predetermined stage corresponding to the value of system state Px The transmission signal data to be generated is generated and transmitted to the corresponding measurement unit. Also, the weight value is transmitted from the corresponding measurement unit to the central control unit 11 and stored in the memory within the second predetermined time T0 (msec) up to the time point (2). The central control unit 11 corrects the zero-point fluctuation component of the acquired weight value, determines the weight rank by the time point (3) based on the corrected weight value, and distributes at the distribution position corresponding to the weight rank. The distribution signal is generated and held, and the driving of the gate opening / closing cylinder is started at the distribution position according to the distribution signal at the start time (4) of the next system state.

  FIG. 8 shows which stage S1 to S16 is located at which outer peripheral position 1 to 8 on the circumference of FIG. 1 in each system state P1 to P16.

  In the system state P1, the stage S1 starts to enter the outer peripheral position 1 until it completely enters and overlaps, that is, in FIG. 1, the end g on the rotation advance side of the stage S1 exceeds the virtual extension line d1. This corresponds to the period up to the extension line d2. During this period, the stage S16 is placed at the outer circumferential position 2, the stage S15 is placed at the outer circumferential position 3, the stage S14 is placed at the outer circumferential position 4, the stage S13 is placed at the outer circumferential position 5, and the stage S12 is placed at the outer circumferential position 6. The base S11 enters the outer peripheral position 7 and the mounting base S10 enters the outer peripheral position 8 and then completely enters and overlaps.

  In the system state P2, the stage S2 is at the outer peripheral position 1, the stage S1 is at the outer peripheral position 2, the stage S16 is at the outer peripheral position 3, the stage S15 is at the outer peripheral position 4, and the stage S14 is at the outer peripheral position 5. The stage S13 is placed at the outer peripheral position 6, the stage S12 is placed at the outer peripheral position 7, and the stage S11 is placed at the outer peripheral position 8, and then completely enters and overlaps.

  Similarly, as the system state advances, the platforms that enter the respective outer peripheral positions 1 to 8 are shifted one by one.

  In the state shown in FIG. 1, since the platforms S16 to S9 are completely overlapped with the outer peripheral positions 1 to 8, respectively, the system state S16 is completed as shown in FIG. Shows just before the start.

  Next, the system state and weight acquisition timing will be described.

  In FIG. 1, in the system state P1, the platforms S1 to S16 shown in () reach the outer peripheral positions 1 to 8. That is, the stage S1 is at the outer peripheral position 1, the stage S16 is at the outer peripheral position 2, the stage S15 is at the outer peripheral position 3, the stage S14 is at the outer peripheral position 4, the stage S13 is at the outer peripheral position 5, and the stage S12. Are placed in the outer peripheral position 6, the mounting base S 11 is in the outer peripheral position 7, and the mounting base S 10 is in the outer peripheral position 8. Further, the mounting table S7 passes through the zero point drift correction weight acquisition position Iz.

  For the stage S1, it is sufficient that the weight value can be acquired at the position of the virtual extension line I1 in FIG. 1. By this position, the average value of the cell register output of the shift register SFR3 up to the output point I1 of the filter in FIG. It only has to be read.

  For the stage S16, it is only necessary to obtain the weight value at the position of the virtual extension line I2 in FIG. 1. By this position, the average value of the cell register output of the shift register SFR3 up to the output point I2 of the filter in FIG. It only needs to be readable.

  Similarly, the platforms S15 to S12 need only be able to read the average values of the cell register outputs from the filter output points I3 to I6 in FIG. 5 up to the positions of the virtual extension lines I3 to I6 in FIG.

  Also for the mounting table S11, it is only necessary to obtain the weight value at the position of the virtual extension line I7 in FIG. 1, and it is only necessary to read the average value of the cell register output of the shift register SFR3 up to the filter output point I7 in FIG.

  The weight value read at the position of the virtual extension line I7 is determined as one of the weight ranks (6), (7), and (8) as described later.

  Since the weight rank (8) is determined at this point, the stage S11 no longer needs to acquire the weight value in the next system state P2, and even when the weight rank (8) is determined, the system state P1. The weight value read at the position of the virtual extension line I7 may be used as the weight value of the article.

  Therefore, in the system state P1, it is not necessary to acquire a weight value for the mounting table S10.

  As for the mounting table S7, the output point Iz of the filter in FIG. 5, that is, the output of the second average value calculation circuit (AV2) 31 may be read by the position of the virtual extension line Iz in FIG.

  FIG. 9 shows the platforms S1 to S16 from which the weight values are to be acquired and the output points I1 to I7 and Iz of the filters from which the weight values are to be read in the respective system states P1 to P16.

  In the system state P1, as described above, the weight values up to the filter output points I1, I2, I3, I4, I5, I6, and I7 are respectively obtained for the mounts S1, S16, S15, S14, S13, S12, and S11. What is necessary is just to acquire, and what is necessary is just to acquire the weight value of the output point Iz about the mounting base S7 which passes the weight acquisition position Iz for zero point drift correction | amendment.

  Further, in the system state P2, if the weight values up to the filter output points I1, I2, I3, I4, I5, I6, and I7 are obtained for the platforms S2, S1, S16, S15, S14, S13, and S12, respectively. The weight value of the output point Iz may be acquired for the stage S8 that passes through the zero point drift correction weight acquisition position Iz.

  Similarly, as the system state progresses, it is only necessary to shift one stage for obtaining the weight value.

  Based on FIG. 9, the central control unit 11 designates one of the filter output points I1 to I7 and Iz for the measurement unit 6k corresponding to the platform Sk of the platform number k for each system state. .

Filter example, the system state P1, as shown in FIG. 9, to specify the output point I1 of the filter with respect to the measuring unit ₆₁ corresponding to the platform S1, the measurement unit 6 ₁₆ corresponding to the platform S16 of specifying the output point I2, specify the output point I3 of the filter to the measurement unit 6 ₁₅ corresponding to the platform S15, similarly to below, the platform S14, S13, S12 corresponding to the measurement unit 6 _14, 6 _13, 6 ₁₂ output point of the filter to I4, I5, I6, specified, specifying the output point I7 of the filter to the measurement unit 6 ₁₁ corresponding to the platform S11, corresponding to the platform S7 specifying the output point Iz of the filter with respect to the measuring unit 6 _7.

Also, the system state P2, as shown in FIG. 9, the filter specifies the output point I1 of the filter with respect to the measuring unit 6 ₂ corresponding to the load platform S2, the measuring unit ₆₁ corresponding to the platform S1 Specifies the output point I2 of specifying the output point I3 of the filter to the measurement unit 6 ₁₆ corresponding to the platform S16, Similarly, the platform S15, S14, the measuring unit 6 ₁₅ corresponding to S13, 6 _14, 6 ₁₃ specifies the output point I4, I5, I6 of the filter, with respect, to specify the output point I7 of the filter to the measurement unit 6 ₁₂ corresponding to the load platform S12, corresponding to the platform S8 measurement specifying the output point Iz of the filter to the unit 6 _8.

  Similarly, one of the filter output points I1 to I7 and Iz is designated for the corresponding measurement unit in accordance with each system state P3 to P16.

  In each system state P1 to P16 in FIG. 10, a distribution signal is stored to determine whether it is necessary to drive the gate opening / closing cylinders of the platforms S1 to S16 for discharging and distributing the articles 13. Indicates the stage on which the output memory should be verified.

  In each of the system states P1 to P16, the stage on which the distribution output memory is to be verified is the stage that approaches the distribution positions (1) to (8) in FIG.

  Therefore, for example, in the system state P1, the platforms S16, S15, S14, S13, S12, S11. S10. S9 is each distribution position (1), (2), (3), (4). (5), (6). Since (7) and (8) are reached, these platforms S16, S15, S14, S13, S12, S11. S10. S9 is a platform to be verified.

  In the system state P2, the platforms S1, S16, S15, S14, S13, S12, S11. S10 is each distribution position (1), (2), (3), (4). (5), (6). Since (7) and (8) are reached, these platforms S1, S16, S15, S14, S13, S12, S11. S10 is the platform to be verified.

  Similarly, as the system state progresses, the stage on which the distribution output memory is to be verified is shifted by one.

  FIGS. 11A and 11B are flowcharts for explaining the operation of this embodiment, and are executed by the arithmetic control circuit 18 of the centralized control unit 11. The built-in clock generation circuit interrupts the CPU of the arithmetic control circuit 18 with, for example, a 1 msec clock pulse, and is processed with the highest priority. That is, it is executed with the highest priority every 1 msec. The slits 33 and 34 of the annular ring 35 are formed so that each of the pulses Tp and Rp has a pulse width sufficiently longer than 1 msec even when the rotation of the turntable 2 is fastest.

  First, as shown in FIG. 11A, it is determined whether or not the timing pulse Tp is at a high level (step n1). When the timing pulse Tp is not at a high level, the system state transition flag Fc is set to “0” because it is not the system state transition timing. To step n8 (step n17).

  In step n1, when the timing pulse Tp is at a high level, it is determined that the system state transition timing is “0” (step n2), and the flag Fc is “0”. When it is "0", the process proceeds to step n3, the system state transition flag Fc is set to "1", and it is determined whether or not the reset pulse Rp is at high level (step n4). Assuming that it is the transition timing to the state P1, "1" indicating the system state P1 is set in the counter Px indicating which system state it is, and the process proceeds to step n6 (step n5).

  In step n4, when the reset pulse Rp is not at the high level, “1” is added to the count value of the counter Px and the process proceeds to step n6, assuming that it is a transition timing to a system state other than the system state P1. Step n18).

  In step n6, "1" is set to the system state start flag Fs indicating that the system state of the count value of the counter Px has started, and the process proceeds to step n7.

  In step n7, the distribution output memory of a predetermined platform corresponding to the value of the system state Px shown in FIG. 10 is verified. For example, when the system state is P1, as shown in FIG. 10, the distribution output memories of the platforms S16 to S9 approaching the distribution positions (1) to (8) are verified. If the distribution output memory is “1”, the drive signal for the cylinder for opening and closing the platform is set, and the process proceeds to Step n9.

  This step n7 is processing corresponding to the above-mentioned time point (4) in FIG. 7, and details thereof are shown in FIG.

  As shown in FIG. 12, according to the value of the system state Px, a distribution output memory for a predetermined platform is tested, and a process for driving a cylinder for opening / closing the gate of the platform is performed.

For example, when the system state Px = 1 (system state P1), it is determined whether or not the distribution output memory MR16 of the mounting table S16 is “1” (step n7 ₁ −1) and is “1”. In some cases, the driving flag FV16 for driving the gate opening / closing cylinder of the mounting table S16 is set to “1” (step n7 ₁ -2), the distribution output memory MR16 is reset to “0”, and step n7 ₁ -4 (step n7 ₁ -3).

In step n7 ₁ -4, it is determined whether the sorting output memory MR15 of the platform S15 is "1", when it is "1", for driving the cylinder for gating the platform S15 It sets the drive flag FV15 to "1" (step n7 ₁ -5), and resets the sorting output memory MR15 to "0" and proceeds to the next step (step n7 ₁ -6).

  Similarly, the distribution output memories MR14, S13, S12, S11, and S10 of the platforms S14, S13, S12, S11, and S10 are verified, and processing is performed for driving the gate opening / closing cylinder.

In step n7 ₁ -21, it is determined whether the sorting output memory MR9 of the platform S9, "1", when it is "1", drives the cylinder for gating the platform S9 "1" is set in the drive flag FV9 for (step n7 ₁ -22), the flow proceeds to step n8 in FIG 11A resets the sorting output memory MR9 to "0" (step n7 ₁ -23).

Further, when the system state Px = 2, it is determined whether or not the distribution output memory MR1 of the mounting table S1 is “1” (step n7 ₂ −1), and when it is “1”, the mounting table S1. The drive flag FV1 for driving the gate opening / closing cylinder is set to “1” (step n7 ₂ -2), the distribution output memory MR1 is reset to “0”, and the process proceeds to step n7 ₂ -4 ( Step n7 ₂ -3).

In step n7 ₂ -4, it is determined whether or not the distribution output memory MR16 of the mounting table S16 is “1”. If it is “1”, the gate opening / closing cylinder of the mounting table S16 is driven. The drive flag FV16 is set to “1” (step n7 ₂ −5), the distribution output memory MR16 is reset to “0”, and the process proceeds to the next step (step n7 ₂ −5).

  In the same manner, the distribution output memories MR15, S14, S13, S12, and S11 of the platforms S15, S14, S13, S12, and S11 are verified, and processing is performed for driving the gate opening / closing cylinder.

In step n7 ₂ -21, it is determined whether or not the distribution output memory MR10 of the mounting table S10 is “1”. If it is “1”, the gate opening / closing cylinder of the mounting table S10 is driven. "1" is set in the drive flag FV10 for (step n7 ₂ -22), the flow proceeds to step n8 in FIG 11A resets the sorting output memory MR10 to "0" (step n7 ₂ -23).

Similarly, according to each of the system states P3 to P15, the distribution output memory of the predetermined platform shown in FIG. 10 is verified, and a process for driving the gate opening / closing cylinder is performed, and the system state Px = 16 When it is, it is determined whether or not the distribution output memory MR15 of the mounting table S15 is “1” (step n7 ₁₆ −1). When it is “1”, the gate opening / closing cylinder of the mounting table S15 is turned on. The drive flag FV15 for driving is set to “1” (step n7 ₁₆ -2), the distribution output memory MR15 is reset to “0”, and the process proceeds to step n7 ₁₆ −4 (step n7 ₁₆ −3).

In step n7 ₁₆ -4, it is determined whether or not the distribution output memory MR14 of the mounting table S14 is “1”. If it is “1”, the gate opening / closing cylinder of the mounting table S14 is driven. The drive flag FV14 is set to “1” (step n7 ₁₆ −5), the distribution output memory MR14 is reset to “0”, and the process proceeds to the next step (step n7 ₁₆ −6).

 Similarly, the distribution output memories MR13, S12, S11, S10, and S9 of the platforms S13, S12, S11, S10, and S9 are verified, and processing for driving the gate opening / closing cylinder is performed.

In step n7 ₁₆ -21, it is determined whether the distribution output memory MR8 of the mounting table S8 is "1". If it is "1", the gate opening / closing cylinder of the mounting table S8 is driven. The drive flag FV8 is set to “1” (step n7 ₁₆ −22), the distribution output memory MR8 is reset to “0”, and the process proceeds to step n8 in FIG. 11A (step n7 ₁₆ −23).

  In step n8 in FIG. 11A, it is determined whether or not the system state start flag Fs is “1”. If not, the process proceeds to step n19 in FIG. 11B. When the system state start flag Fs is “1”, it is determined that the system state is started, and “1” is added to the counter Co for measuring the first and second predetermined times T01 and T0 (step n9). ), Go to Step n10.

  The first predetermined time T01 corresponds to the time from when the system state starts until the platforms S1 to S16 reach the position of the virtual extension lines I1, I2,... I7 in FIG. Waiting for T01 to elapse, the output point of the filter for obtaining the weight value is designated for the measurement unit on the predetermined stage. The second predetermined time T0 corresponds to the time required for receiving the weight value from the measurement unit specifying the output point of the filter and making it readable, and the system state is the same as the first predetermined time T01. Measurement starts after it starts.

  In step n10, it is determined whether or not a first predetermined time elapsed flag F01 indicating that the first predetermined time T01 has elapsed is "0". If it is not "0", the first predetermined time T01 has already elapsed. The process proceeds to step n14, and when it is “0”, the process proceeds to step n11, where it is determined whether or not the count value of the counter Co has reached the first predetermined time T01, and when it is not the predetermined time T01, the process proceeds to step n14. Move.

  When the count value of the counter Co reaches the first predetermined time T01 in step n11, the first predetermined time elapsed flag F01 is set to “1” (step n12), and the process proceeds to step n13.

In step n13, an output command for designating a stage with a predetermined number corresponding to the system state Px shown in FIG. 9 and a filter output point is set in the register, and an output command flag F indicating that the output command has been set. “1” is set to ₀ , and the process proceeds to Step n14.

This step n13 is processing corresponding to the above-mentioned time point (1) in FIG. 7, and an output command for acquiring a weight value from a predetermined filter output point of a predetermined stage shown in FIG. 9 according to the system state. To the measurement unit. For example, when a system state P1, as shown in FIG. 9, the filter output point I1 of the filter with respect to the measuring unit ₆₁ corresponding to the platform S1, the measurement unit 6 ₁₆ corresponding to the platform S16 of the output point I2, the output point I3 of the filter to the measurement unit 6 ₁₅ corresponding to the platform S15, similarly to below, the output point I7 of the filter to the measurement unit 6 ₁₁ corresponding to the platform S11 , it transmits an output command for obtaining the weight value by specifying each output point Iz of the filter with respect to the measuring unit 6 ₇ corresponding to the platform S7. The reading of the weight value transmitted from the measurement units 6 ₁ , 6 _{16 to} 6 ₁₁ , 6 ₇ in response to this output command will be described later.

  In step n14, it is determined whether or not the count value of the counter Co has reached the second predetermined time T0. If not, the process proceeds to step n19 in FIG. 11B.

 When the count value of the counter Co reaches the second predetermined time T0, the counter Co is reset to “0”, and the system state start flag Fs and the first predetermined time elapsed flag F01 are reset to “0” (step n15 ), “1” is set to the second predetermined time elapsed flag Fr indicating that the second predetermined time T0 has elapsed, and the process proceeds to step n19 in FIG. 11B (step n16).

  In step n19 of FIG. 11B, it is determined whether or not the driving flag FV1 for driving the gate opening / closing cylinder of the mounting table S1 is “1”. The cylinder for driving is started to open the gate, and "1" is added to the counter C1 to measure the operating time T1 of the cylinder (step n20), and the count value of the counter C1 becomes the operating time T1. (Step n21), and when the operating time T1 is not reached, the process proceeds to step n23. When the operation time T1 is reached, the count value of the counter is reset on the assumption that the opening and closing of the gate is completed, and the drive flag FV1 of the mounting table S1 is reset to “0” and the process proceeds to step n23 (step n22).

  In step n23, it is determined whether or not the drive flag FV2 for driving the gate opening / closing cylinder of the mounting table S2 is "1". If it is "1", the gate opening / closing cylinder of the mounting table S2 is determined. Is started to open the gate, and "1" is added to the counter C2 to measure the operation time T1 (step n24), and it is determined whether or not the count value of the counter C2 has reached the operation time T1. However (step n25), when the operating time T1 is not reached, the process proceeds to step n27. When the operation time T1 is reached, the count value of the counter is reset on the assumption that the opening and closing of the gate is completed, and the drive flag FV2 of the mounting table S2 is reset to “0” and the process proceeds to step n27 (step n26).

  Thereafter, similarly, the same processing is performed for the platforms S3 to S15. In step n28, it is determined whether or not the drive flag FV16 for driving the gate opening / closing cylinder of the platform S16 is "1". When it is “1”, the gate opening / closing cylinder of the mounting table S16 is driven to start opening the gate, and “1” is added to the counter C16 in order to measure the operation time T1 (step n29). Then, it is determined whether or not the count value of the counter C16 has reached the operating time T1 (step n30). When the operation time T1 is reached, the count value of the counter C16 is reset because the gate opening / closing is completed, and the drive flag FV16 of the mounting table S16 is reset to “0” (step n31).

Next, as a timer for measuring the display interval in the display unit 25 of the display setting unit 21 in FIG. 4, it is determined whether or not the display interval flag Fa is set to “1” (step n32), and is not set. When it is set, the counter Ca for measuring the display interval is incremented by “1” (step n33), and it is determined whether or not the count value of the counter Ca has reached the display interval Ta (step n33). n34). When the count value of the counter Ca is not equal to the display interval Ta, the process is terminated. When the count value reaches the display interval Ta, the count value of the counter Ca is reset (step n35), and the display interval flag Fa is set to “0”. Reset and finish (step n36)
FIG. 13 is a flowchart showing the process of acquiring the weight between the central control unit 11 and each of the measurement units 6 _{1 to} 6 _16. This processing program is a program with a lower priority than the above-described FIGS. 11A and 11B. It is.

  As shown in FIG. 13A, it is determined whether or not the output command flag F0 indicating that the output command for weight acquisition is set is “1” (step n101), and is “1”. In some cases, the output instruction flag F0 is reset to “0” (step n102), and the data output set in the predetermined output instruction register corresponding to the value of the current system state Px as shown in FIG. The command code, mounting number, and filter output point data sets are sequentially set in the serial controller 12 and transmitted to the corresponding measurement units, and the process ends (step n103).

  The measurement unit corresponding to each mounting number that receives these output commands calculates the average value up to the output point of the specified filter as the weight value, and sets the data content code, mounting number, and weight value for each It is set in the serial controller 10 and transmitted to the serial controller 12 of the centralized control unit 11.

As shown in FIG. 13B, the central control unit 11 determines whether or not there is a read request from the serial controller 12 (step n201). When there is a read request, the central control unit 11 determines a predetermined value corresponding to the mounting number k. The weight of the filter output transmitted from the measurement units 6 _{1 to} 6 ₁₆ is stored in the weight value register (WMRk) k = _{1 to 16,} and the process is terminated (step n202).

  The processing shown in FIG. 13 is performed at the second predetermined time T0 msec described above after transmitting an output command signal to each platform, that is, at the second predetermined time T0 msec shown in step n14 of FIGS. 7 and 11A described above. Executed.

  After the second predetermined time T0 elapses, processing such as correction of the zero-point fluctuation component of the acquired weight value, determination of the weight rank based on the corrected weight value, and update of the distribution output memory, etc. until the transition to the next system state Is done.

  Next, processing for correcting the zero point fluctuation amount caused by the above-described aerodynamic force and mechanical impact force will be described in detail.

  First, the measurement of the stationary zero point weight value of each measuring instrument and the stationary zero point adjustment will be described.

  The operator confirms that the article 13 is not loaded on the platforms S <b> 1 to S <b> 16 of each measuring instrument, and the input unit 24 of the display setting unit 21 connected to the central control unit 11. The operation switch is turned off, and the stationary measurement mode in which the weight value is acquired without rotating the measuring instrument is thereby entered.

In this static measurement mode, the central control unit 11 sequentially specifies the measurement units 6 _{1 to} 616 for the measuring instruments s = _{1 to 16} . The designated measurement units 6 _{1 to} 6 ₁₆ transmit, for example, the output of the second average value calculation circuit (AV2) 31 of FIG. 5 to the display setting unit 21 as the weight value of the A / D count level after passing through the filter. To do. That is, in the static measurement mode, the filter characteristics of the respective measuring instruments are made common.

   FIGS. 14A and 14B are flowcharts showing the process of the static measurement mode. In the measurement of the static zero-point weight value, no load 13 in which the article 13 is not placed on each of the platforms S1 to S16 of each measuring instrument. It is.

  As shown in FIG. 14A, it is determined whether or not the operation switch is ON (step n300). When the operation switch is ON, it is determined that it is a dynamic weight measurement mode for rotationally driving the measuring instrument, and the process proceeds to step n320. Then, the flag Ff indicating that the filter characteristics are shared is reset to “0”, and the process proceeds to a dynamic weight measurement mode described later.

In step n300, when the operation switch is not ON, it is determined that it is a stationary measurement mode in which the measuring instrument is not rotationally driven, and the process proceeds to step n301, where a flag Ff indicating that the characteristics of the filters of each measuring instrument are shared is set to “0”. It is determined whether or not it has been reset. If it has not been reset, that is, if the flag Ff is set to “1” and a common filter is set, the process proceeds to step n303. In step n301, when the flag Ff is reset to “0”, the flag Ff indicating that the filter characteristics of the respective measuring instruments are made common is set to “1”, and the output of the filter is set to, for example, 5 is transmitted to each of the measurement units 6 _{1 to} 6 ₁₆ so as to be set to the output of the second average value calculation circuit (AV2) 31 in FIG. 5 (step n302), and the process proceeds to step n303.

Next, the measuring instruments the platform S1, and updates by reading the still zero weight values, to display a still zero weight values, first, in step n303, to the measuring unit ₆₁ corresponding to the platform S1 Te, the routine goes to step n304 instructs to transmit an output of the second average value calculation circuit (AV2) 31, receives data from the measuring unit _61, based on the received data, metering of the platform S1 The weight value Wn1 of the vessel is calculated according to the following equation (step n305).

Wn1 = K1. (Wa1-Wi1) -Wz1
Here, K1 is the span coefficient of the mounting stage S1, Wa1 is the output of the received average value calculation circuit (AV2) 31, the weight value of the A / D count level, Wi1 is the weighing stage in the adjustment stage before this The A / D count level weight value of the output signal of the load sensor in an unloaded state is read into the central control unit 11 as Wa1, and is stored as a tare load (initial weight). Wz1 is a load sensor or This is the value (zero point weight) of the register that stores the drift of the measurement circuit and the weight drift amount due to the foreign matter on the mounting S1.

  The calculated weight value Wn1 is used as the stationary zero point weight value Wzs0 <1> of the weighing instrument of the mounting platform S1, and the stationary zero point weight value storage register Wrzs0 <s>, (s = 1) for the weighing instrument of the mounting platform S1 is updated. (Step n306), and the process proceeds to Step n307. Note that the register and the like for storing the weight value are configured by a memory in the arithmetic control circuit 18 of the centralized control unit 11.

  In step n307, the data is converted into display data, output to the display register of the arithmetic control circuit 23 of the display setting unit 21, and displayed on the display unit 25.

Next, as shown in FIG. 14B, the weighing device on the mounting table S2 is processed in the same manner as the weighing device on the loading table S1 (step n308). That is, the measurement unit 6 ₂ corresponding to the load platform S2, outputs commands to transmit the second average value calculation circuit (AV2) 31, based on the received data, the weighing platform S2 measuring instrument The weight value Wn2 is calculated, and the calculated weight value Wn2 is set as a stationary zero point weight value Wzs0 <2> of the weighing instrument of the platform S2, and a stationary zero point weight value storage register Wrzs0 <s> for the weighing instrument of the platform S2. (S = 2) is updated, converted into display data, output to the display register, and displayed on the display unit 25 of the display setting unit 21.

  Thereafter, similarly, the same processing is performed for the platforms S3, S4, S5,..., S16 (step n309), and the process proceeds to step n310.

  In step n310, a flag Fa indicating the driving of the timer for measuring the display interval is set, and whether or not the flag Fa has been set to “0” by the display interval measurement processing in steps n33 to n36 of FIG. 11B described above. When it is determined (step n311) and becomes “0”, it is determined that the display interval has elapsed, and the process returns to step n300.

  These static zero point weight values Wzs0 <s>, (s = 1 to 16) are internal count levels after A / D conversion, have a resolution four times the display level, and are ¼ level. Then, it is sent to the display register as the weight value of the display level, and is displayed on the display unit 25 of the display setting unit 21 as the display weight value.

  While the operation switch is OFF, the above processing is repeated as a display interval after elapse of a timer time of, for example, about 200 msec.

Therefore, when updating the static zero point weight value Wzs0 <s> and updating the display, the central control unit 11 designates reading of the A / D count level weight value for the measuring units 6 _{1 to} 6 ₁₆ for the measuring instruments s = _{1 to 16} And the reading thereof are repeatedly executed at a timer time interval of 200 msec.

  The operator can visually recognize the stationary zero point weight value on the stationary platforms S1 to S16 in the measuring instruments s = 1 to 16 updated at intervals of about 200 msec on the display unit 25 of the display setting unit 21. When an article is placed on the weighing platform, the article weight value can be visually recognized.

  Next, stationary zero adjustment of each measuring instrument is performed. In this stationary zero point adjustment, the operator checks the state in which no article is placed on the platforms S1 to S16 in any weighing instrument, and the operator uses the display setting unit 21 connected to the centralized control unit 11. The zero adjustment switch of the input unit 24 is turned on. This zero adjustment switch is effective only when the operation switch is OFF, that is, when the measuring instrument is not rotating.

  When the zero adjustment switch is turned on, the static zero-point weight value Wzs0 <s> stored in the static zero-point weight value storage register Wrzs0 <s> is set to, for example, the weighing instrument s = 1. It replaces with the data of Wz1 in the calculation formula of Wn1. The same processing is performed for the measuring instruments s = 2 to 16. Thus, the zero point adjustment is performed simultaneously for all the measuring instruments.

  Next, the measurement of the zero point fluctuation component during the rotation of the measuring instrument in the adjustment operation and the process of registering the zero point fluctuation component in the table memory will be described.

  The operator confirms that the article 13 is not placed on each of the platforms S1 to S16 of each measuring instrument, and rotates the rotation speed at the input unit 24 of the display setting unit 21 connected to the central control unit 11. Set v = 1 step (V = 10 rpm).

  Next, the operation switch is turned on to enter the dynamic weight measurement mode. As a result, a motor drive signal corresponding to the set speed is output from the motor drive circuit 17, and the measuring instrument rotates at the set rotation speed. Further, when a dynamic zero point fluctuation component detection mode switch that is effective only when the operation switch is ON is turned on, a dynamic zero point fluctuation component detection mode is set.

  FIG. 15 is a flowchart showing processing in the dynamic weight measurement mode.

  First, it indicates whether or not the second predetermined time T0 has passed, that is, the time required to receive the weight value from the measurement unit that designates the output point of the filter and to be able to read it. It is determined whether or not the flag Fr is “1” (step n400). When the flag Fr has elapsed, that is, when the flag Fr is “1”, the flag Fr is reset to “0” (step n401). Before shifting to the state, processing such as correction of the zero point fluctuation component of the acquired weight value, determination of the weight rank based on the corrected weight value, and update of the distribution output memory are performed.

  Specifically, it is determined whether or not the detection mode of the dynamic zero point fluctuation component is in effect, that is, whether or not the flag Fdz indicating that the dynamic zero point fluctuation component detection mode switch is turned on is “1”. (Step n402) When not in the dynamic zero point fluctuation component detection mode, the process proceeds to Step n403, and the programs PG1 to PG16 corresponding to the system states P1 to P16 are selected according to the value of the system state Px, as described later. (Steps n404-1 to n404-16).

  If the dynamic zero point fluctuation component detection mode is selected, the process proceeds to step n405, and the programs PG1 'to PG16' corresponding to the system states P1 to P16 are selected and executed (steps n406-1 to 406-16). . In the dynamic zero point fluctuation component detection mode, there is no load in which the article 13 is not placed on each of the platforms S1 to S16 of each measuring instrument. During execution of this dynamic zero point fluctuation component detection mode, display is performed. This is preferably displayed on the display unit 25 of the setting unit 21.

  FIG. 16 shows processing of the program PG1 ′ in the system state P1 in the dynamic zero point fluctuation component detection mode.

  Since the rotational speed v = 1 (one step) is set as described above, the dynamic zero point weight value Wzd <s, v, i> is Wzd <s, v, i> = Wzd <s, 1, i>.

  As shown in FIG. 16, in step n500, the weight value Wa1 for the mounting table S1 is read by the WMR1 register, and the weight value Wn1 is calculated by the following equation (step n501).

Wn1 = K1. (Wa1-Wi1) -Wz1
The weight value Wn1 is the weight value Wzd <1,1,1> at the weight acquisition position i = 1 at the rotational speed v = 1 stage of the measuring instrument (s = 1) of the mounting table S1. This weight value Wzd <1,1,1> is integrated in order to calculate the average value by rotating a plurality of times (R times) or more (step n502).

  Similarly, for the mounting table S16, the weight value Wa16 is read by the WMR16 register (step n503), the weight value Wn16 is calculated (step n504), and the rotation speed v of the weighing instrument (s = 16) of the mounting table S16 = 1 step. The weight values Wzd <16,1,2> at the weight acquisition position i = 2 at are integrated (step n505).

  Similarly, the weight values Wzd <15,1 for the platforms S15, S14, S13, S12, S11 passing through the respective weight acquisition positions I1 to I7 and the platform S7 passing through the zero point drift correction weight acquisition position Iz. , 3>, Wzd <14,1,4>, Wzd <13,1,5>, Wzd <12,1,6>, Wzd <11,1,7>, Wzd <7,1, z> Calculate and integrate (steps n506, 507, 508, 509, 510, 511).

  FIG. 16 shows the processing of the program PG1 ′ in the system state P1, for example, in the program PG2 ′ in the system state P2, the above-described tables S1, S16, S15, S14, S13. Instead of S12, S11, S7, S2, S1, S16, S15, S14. S13, S12, and S8, and as the system state progresses, one platform is shifted.

  After executing the programs PG1 ′ to PG16 ′ selected corresponding to the above system states P1 to P16, the process proceeds to steps n407-1 to n407-16 in FIG.

  In steps n407-1 to n407-16, for each system state, “1” is added to the counters Cp1 to Cp16 for counting the number of times the weight value is calculated and updated, and the counters Cp1 to Cp16 for all system states are added. It is determined whether or not the count value has reached the predetermined number R (step n408). When the count value reaches the predetermined number R, each integrated weight ΣWzd <s, v, i> is dynamically divided by the predetermined number R. The average value of the zero point weight value is calculated, the difference between this average value and the static zero point weight value Wzs0 <s> of the same measuring instrument is obtained, and this is registered in the memory table as the zero point fluctuation component Czd <s, v, i>. Then, the count values of the counters Cp1 to Cp16 and the flag Fdz are reset (step n409).

  Next, the operator sets the rotation speed v = 2 (two steps) to change the rotation speed, further turns on the dynamic zero point fluctuation component detection mode switch, executes the same processing as above, and rotates. The zero point fluctuation component C <s, 2, i> is stored in a two-dimensional table of the measuring instruments s = 1 to 16 and the weight value acquisition positions i = 1 to 7 and z corresponding to the speed v = 2.

  Similarly, a zero-point fluctuation component C <s, 3 is added to a two-dimensional table of measuring instruments s = 1 to 16 corresponding to v = 3 to 11 (steps 3 to 11) and weight value acquisition positions i = 1 to 7 and z. , I> to C <s, 11, i> are stored.

  Next, the correction of the zero point fluctuation amount during the operation of supplying the article 13 and selecting the weight will be described.

  At the time of operation, since it is not the dynamic zero point fluctuation component detection mode in step n402 in FIG. 15, the process proceeds to step n403 and steps n404-1 to n404-16, and the programs PG1 to PG16 according to system states P1 to P16. Select and execute.

 17A to 17F show processing of the program PG1 in the system state P1 in the operation operation.

 FIG. 17A shows an example in which the rotation speed v = 1 stage is set.

 First, in step n600, the weight value Wa1 for the mounting table S1 is read by the WMR1 register. The zero point fluctuation component Czd <1,1,1> corresponding to the weighing instrument s = 1, the rotation speed v = 1, and the weight value acquisition position i = 1 corresponding to the mounting table S1 is read from the table (step n601). Using this zero point fluctuation component, the weight value Wn1 is calculated by the following equation, that is, zero point correction is performed (step n602).

Wn1 = K1. (Wa1-Wi1) -Wz1-Czd <1,1,1>
Next, the calculated weight value Wn1 is converted into the weight value Wd1 of the display value level (step n603), the weight rank is determined based on the boundary weight value in FIG. 2 (step n604), and the process proceeds to step n605.

  In step n605, it is determined whether or not the determined weight rank is the weight rank (1). If it is the weight rank (1), the weight rank (1) is determined, and the distribution position ( In order to distribute to 1), “1” is set in the distribution output memory MR1 for the mounting table S1 (step n606). Next, the weighing completion sign of the mounting table S1 is set (step n607), the weight value of the mounting table S1 is determined (step n608), and the process proceeds to step n609 in FIG. 17B. The weight value determined in step n608 is used for display, output, and tabulation.

  If it is not the weight rank (1) in step n605, the weight value is acquired in the next system state P2 and the weight rank is determined. Therefore, the process proceeds to step n609 in FIG. 17B without determining the weight value.

  In step n609 of FIG. 17B, it is determined whether or not there is a weighing completion sign for the mounting table S16. If there is no weighing completion sign, the weight value for the loading table S16 is read by the weight value register WMR16 (step n610). A zero point fluctuation component Czd <16,1,2> corresponding to the weighing instrument s = 16, the rotation speed v = 1, and the weight value acquisition position i = 2 corresponding to the mounting table S16 is called from the table (step n611). Using this zero point fluctuation component, the weight value Wn16 is calculated by the following equation, that is, zero point correction is performed (step n612).

Wn16 = K16 · (Wa16−Wi16) −Wz16−Czd <16,1,2>
Next, the weight value (internal count level) Wn16 of the article on the mounting table S16 is converted into the display value level weight value Wd16 (step n613), the weight rank is determined (step n614), and the process proceeds to step n615.

  In step n615, it is determined whether or not the determined weight rank is the weight rank (2). If the weight rank is (2), the weight of the mounting table S16 is determined (step n618). Next, the weighing completion sign of the mounting table S16 is set (step n619), and “1” is set in the distribution output memory MR16 for the mounting table S16 in order to distribute to the distribution position (2) in the next system state P2. Set (step n620), then proceed to step n621 in FIG. 17C.

  If the determined weight rank is not the weight rank (2) in step n615, it is determined whether or not the determined weight rank is the weight rank (1) (step n616). In step n615, when the weight rank is not (2), the article has a weight that is equal to or higher than the weight rank (3) or has a weight in the vicinity of the boundary weight value Wc1 between the weight rank (1) and the weight rank (2). Considered rank (1). Therefore, in step n616, it is determined whether or not the weight rank (1), and if it is the weight rank (1), since it has already passed the distribution position (1), the weight rank (2) is determined. At the same time, the weight value is fixed to the lower limit weight value Wc1 of the weight rank (2), and the process proceeds to Step n619 (Step n617). That is, the article is a weight rank (1) having a weight in the vicinity of the boundary weight value Wc1 between the weight rank (1) and the weight rank (2), but has already passed the sorting position (1). In order to assign rank (2) to the distribution position (2) in the next system state P2, “1” is set in the distribution output memory MR16, and the weight value is the lower limit weight value of the weight rank (2). Wc1 is determined so that an error as a weight measurement value is reduced.

  In step n616, when it is not the weight rank (1), it is equal to or higher than the weight rank (3). Therefore, the weight value is obtained and the weight rank is determined in the next system state P2, so that the weight value is not determined. The process moves to step n621 in FIG. 17C.

  In step n621 of FIG. 17C, it is determined whether or not there is a weighing completion sign for the mounting table S15. If there is no weighing completion sign, the weight value for the loading table S15 is read from the weight value register WMR15 (step n621).

  The zero point fluctuation component Czd <15,1,3> corresponding to the weighing instrument s = 15, the rotation speed v = 1, and the weight value acquisition position i = 3 corresponding to the mounting table S15 is called from the table (step n623). Using this zero point fluctuation component, the weight value Wn15 is calculated by the following equation, that is, zero point correction is performed (step n624).

Wn15 = K15 · (Wa15−Wi15) −Wz15−Czd <15,1,3>
Next, the weight value (internal count level) Wn15 of the article on the platform S15 is converted into the display value level weight value Wd15 (step n625), the weight rank is determined (step n626), and the process proceeds to step n627.

  In step n627, it is determined whether or not the determined weight rank is the weight rank (3). If the weight rank is (3), the weight of the mounting table S15 is determined (step n630). Next, the weighing completion sign of the mounting table S15 is set (step n631), and “1” is set in the distribution output memory MR15 for the mounting table S15 in order to distribute to the distribution position (3) in the next system state P2. It sets (step n632) and moves to step n633 in FIG. 17D.

  In the above step n627, when the determined weight rank is not the weight rank (3), it is determined whether or not the determined weight rank is the weight rank (2) (step n628) and is the weight rank (2). Sometimes, the article is a weight rank 2 having a weight in the vicinity of the boundary weight value Wc2 between the weight rank (2) and the weight rank (3), but has already passed the sorting position (2). 3), and the weight value is fixed to the lower limit weight value Wc2 of the weight rank (3), and the process proceeds to Step n631 (Step n629).

  In step n628, when it is not the weight rank (2), since it is equal to or higher than the weight rank (4), the weight rank is determined based on the weight value acquired in the next system state P2. Move to step n633 of 17D.

  In step n633 of FIG. 17D, the same processing is performed for the mounting table S14. In step n634, the same processing is performed for the mounting table S13. Further, in step n635, the same processing is performed for the mounting table S12. The process moves to step n636.

  In step n636 of FIG. 17E, it is determined whether or not there is a weighing completion sign for the mounting table S11. If there is no weighing completion sign, the weight value for the loading table S11 is read from the weight value register WMR11 (step n637).

  A zero point fluctuation component Czd <11,1,7> corresponding to the weighing instrument s = 11, the rotation speed v = 1, and the weight value acquisition position i = 7 corresponding to the mounting table S11 is called from the table (step n638). Using this zero point fluctuation component, the weight value Wn17 is calculated by the following equation, that is, zero point correction is performed (step n639).

Wn11 = K11 · (Wa11−Wi11) −Wz11−Czd <11,1,7>
Next, the weight value (internal count level) Wn11 of the article on the mounting table S11 is calculated, converted to the weight value Wd11 of the display value level (step n640), the weight rank is determined (step n641), and step n642 is entered. Move.

  In step n642, it is determined whether or not the determined weight rank is the weight rank (7). If the weight rank is the weight rank (7), the weight of the mounting table S11 is determined (step n646). Next, the weighing completion sign of the mounting table S11 is set (step n647), and “1” is set in the distribution output memory MR11 for the mounting table S11 in order to distribute to the distribution position (7) in the next system state P2. Set (step n648), then proceed to step n649 in FIG. 17F.

  In the above step n642, when the determined weight rank is not the weight rank (7), it is determined whether or not the determined weight rank is the weight rank (6) (step n643) and is the weight rank (6). Sometimes the article is a weight rank (6) having a weight in the vicinity of the boundary weight value Wc6 between the weight rank (6) and the weight rank (7), but has already passed the sorting position (6). The rank (7) is determined, and the weight value is fixed to the lower limit weight value Wc6 of the weight rank (7), and the process proceeds to Step n647 (Step n644).

  In step n643, when the determined weight rank is not the weight rank (6), it is the weight rank (8). Therefore, the weight value of the platform S11 is determined, and this weight value is stored in the temporary storage memory. The system state P2 is transferred to step n649 of FIG. 17F (step n645).

  In step n649 of FIG. 17F, it is determined whether or not there is a weighing completion sign of the mounting table S10. If there is a weighing completion sign, the process proceeds to step n653. When there is no weighing completion sign, the determined weight value of the mounting table S10 stored in the previous system state P16 is read from the temporary storage memory, and the weight value of the mounting table 10 is determined (step n650). Next, the weighing completion sign of the mounting table S10 is set (step n651), and “1” is set in the distribution output memory MR10 for the mounting table S10 in order to distribute to the distribution position (8) in the next system state P2. The setting is completed (step n652), and the measurement completion sign of the stage S9 that moves outside the discharge range in the next system state is reset (step n653), and the process proceeds to step n654.

  In step n654, the weight value for the mounting table S7 is read from the weight value register WMR7.

  A zero point fluctuation component Czd <7,1, z> corresponding to the weighing instrument s = 7, the rotation speed v = 1, and the weight value acquisition position i = Iz corresponding to the mounting table S7 is called from the table (step n655). The zero point fluctuation component is corrected by the following equation (step n656).

Wn7 = K7 · (Wa7−Wi7) −Wz7−Czd <7,1, z>
Next, in order to take a plurality (P) of moving averages, the data is stored as the latest data in the zero-point drift shift register of the weighing instrument of the platform S7 composed of P cell registers, and the oldest value is discarded. . When the old data is “0”, Wn7 is stored in all the cell registers (step n657), the average value Wn7a of the P cell registers is calculated (step n658), and this average value Wn7a is loaded. The amount of fluctuation due to the zero point drift of the measuring instrument in S7 is added to the previous zero point correction amount Wz7 for automatic zero point correction, and the process is finished as a new zero point correction amount Wz7 (step n659).

  In this manner, in the system state P1, the weight values are read as shown in FIGS. 17A to 17E for the platforms S1 and S16 to S11 corresponding to the system state P1 shown in FIG. As shown in FIG. 17F, the processing is performed according to the weight value stored in the previous system state P16, and for the mounting S7, the zero point drift amount due to moisture adhering to the measuring instrument or the like. The zero point fluctuation amount is corrected.

  In the next system state P2, for the platforms S2, S1, S16 to S12 corresponding to the system state P2 shown in FIG. 9, the processing including reading the weight value and correcting the zero point variation is performed in the same manner as in FIGS. 17A to 17E. As in FIG. 17F, the stage S11 is processed according to the weight value stored in the previous system state P1, and the zero point fluctuation amount is corrected for the stage S8.

  In the same manner, as the system state advances, the stage is shifted one by one as shown in FIG. 9, and the same processing as in FIGS. 17A to 17F is performed.

  As described above, according to the present embodiment, the zero point variation amount caused by the aerodynamic force and the mechanical impact force included in the weight value acquired during the operation operation can be canceled, so that the zero point adjustment can be accurately performed. This enables measurement accuracy.

In rotary checkweighers 1 configured above mentioned, the centrifugal force acts according to the weight of the size of the article 13 placed on the measuring instrument, but as described above, the rotational speed and weight acquisition positions Filters with different filter characteristics are used.

  For this reason, the response characteristic of the load signal that rises from the time when the article 13 is placed on the platforms S1 to S16 also varies depending on the weight acquisition position, and the centrifugal force from the time after the article 13 is placed on the platforms S1 to S16. Since it acts on the load signal, it is affected by the response characteristics of the filter.

  As a result, the error of the article weight value to which the centrifugal force is applied varies depending on the article weight acquisition position and the rotation speed. It also depends on the weight of the article.

In the present embodiment, the error of the dynamic weight value of the article is corrected, and the correction is performed in the following procedure.

  First, the error amount of the dynamic weight value of an article is obtained by preparing a plurality of, for example, seven sample articles having a known weight and using seven measuring instruments.

  Since the magnitude of the centrifugal force acting on the article varies depending on the rotation speed, it is determined for each rotation speed of v = 1 to 11 steps. The centrifugal force is not different for each measuring instrument and is common.

  First, seven sample articles having a known weight M ′ are prepared. The operator sets the weight M ′ of the sample article from the input unit 24 of the display setting unit 21 connected to the central control unit 11. The set value of the weight M ′ is converted into the value M of the internal count level.

  During the rotating operation of the measuring instrument during the adjustment operation, the operator turns on the dynamic weight correction value detection mode switch of the input unit 24 of the display setting unit 21 to appropriately supply the sample article on the measuring instrument mounting table. Then, the dynamic weight value of the sample article subjected to the centrifugal force is measured for each rotation speed and for each of the article weight value acquisition positions I1 to I7.

However, the dynamic weight value of the sample article corresponds to the zero point fluctuation component Czd <s, v, i> for each article weight value acquisition position i corresponding to the measuring instrument s, the rotation speed v, and the article weight value acquisition position i. calls, determined by correcting the above mentioned and zeros variation as well. The dynamic weight value of the sample article is not different for each measuring instrument s, and varies depending on the rotational speed v and the article weight value acquisition position i.

Therefore, for each rotation speed during the adjustment operation, each measuring instrument is measured a plurality of times for each article weight value acquisition position. However, since the dynamic weight value of the sample article is the same value (s = c) for each measuring instrument s if the rotational speed and the weight value acquisition position are the same, the rotational speed v = 1 to 11 (step). When the weight value of the sample article measured at the article weight value acquisition position i = 1 to 7 is represented by Wmd <c, v, i>,
When v = 1 (step), Wmd <c, 1,1> to Wmd <c, 1,7>
Wmd <c, 2,1> to Wmd <c, 2,7> at v = 2 (stage)
...
Wmd <c, 11,1> to Wmd <c, 11,7> at v = 11 (stage)
Measured several times (Q times) or more, and these measured values are aggregated in a totaling register common to each measuring instrument for each article weight value acquisition position, for each rotational speed v, and for the article weight value. For each acquisition position i, the plurality of average values Wma <v, i>
Wma <1,1> to Wma <1,7> at v = 1 (stage)
Wma <2,1> to Wma <2,7> at v = 2 (stage)
...
Wma <11,1> to Wma <11,7> at v = 11 (stage)
Asking.

The difference between the weight value M set as the weight value of the sample article and the above average value of the sample article obtained as the dynamic weight value including the action of centrifugal force at each article weight value acquisition position is determined by the centrifugal force. This is an error that occurs at each weight value acquisition position. With this error as a dynamic weight correction value D <v, i>, M-Wma <1,1> = D <1 at each rotation speed and at each article weight value acquisition position at v = 1 (step). , 1>
M-Wma <1,2> = D <1,2>
...
M-Wma <1,7> = D <1,7>
At v = 2 (stage), M-Wma <2,1> = D <2,1>
M-Wma <2,2> = D <2,2>
...
M-Wma <2,7> = D <2,7>
...
At v = 11 (stage), M-Wma <11,1> = D <11,1>
M-Wma <11,2> = D <11,2>
...
M-Wma <11,7> = D <11,7>
The centrifugal force error for each rotation speed and each weight value acquisition position is registered in the memory table as a dynamic correction value D <v, i>.

  However, this dynamic correction value is a value applied when the weight of the article is M.

At the time of an operation operation in which an article is supplied to a weighing instrument and is subjected to weight selection, for example, the rotation speed v = 1 (stage) is set. For example, for the measured weighing instrument s = 1 of the mounting stage S1, the article weight is set. The zero point fluctuation amount of the weight measurement value Wn1 acquired at the value acquisition position i = 1 is calculated from the zero point correction amount table based on s = 1, v = 1, i = 1 based on the zero point fluctuation component Cdz <1,1,1>. Call
Wn1 = k1. (Wa1-Wi1) -Wz1-Czd <1,1,1>
And the zero point variation is corrected.

When the weight value Wn1 of the article including the centrifugal force error in which the zero point fluctuation amount is corrected is obtained,
Since the magnitude of the centrifugal force is proportional to the weight (mass) of the article, D <1,1> corresponding to the rotational speed v and the article weight value acquisition position i is called from the dynamic correction amount memory table. ,
(Wn1 / M) ・ D <1,1>
And the dynamic weight correction value corresponding to the size of the article weight value, and finally the accurate weight value Wn1 ′,
Wn1 ′ = Wn1 + (Wn1 / M) · D <v, i>
Calculate as

FIG. 18A is a flowchart for explaining the operation of the present embodiment, which corresponds to FIG. 15 described above, and corresponding steps are denoted by the same step numbers and description thereof is omitted.

In the present embodiment, when it is not the dynamic zero point fluctuation component detection mode in step n402, the process proceeds to step n410, whether or not it is the dynamic weight correction value detection mode, that is, the dynamic weight correction value detection mode. it is determined whether the flag Fdm is "1" indicating, when non-dynamic weight correction value detection mode proceeds to the same step n403 as above mentioned.

  When the dynamic weight correction value detection mode is set in step n410, the process proceeds to step n411 in FIG. 18B.

  In step n411, the programs PG1 ″ to PG16 ″ corresponding to the system states P1 to P16 are selected and executed according to the value of the system state Px.

  19A and 19B show processing of the program PG1 ″ in the system state P1 in the dynamic weight correction value detection mode.

  FIGS. 19A and 19B show an example in which the rotation speed v = 1 stage is set.

  The weight value Wa1 for the stage S1 is read by the WMR1 register (step n700). The zero point fluctuation component Czd <1,1,1> corresponding to the measuring instrument s = 1, the rotation speed v = 1, and the weight value acquisition position i = 1 corresponding to the mounting table S1 is called from the table (step n701). Using this zero point fluctuation component, the weight value Wn1 is calculated by the following equation, that is, zero point correction is performed (step n702).

Wn1 = K1. (Wa1-Wi1) -Wz1-Czd <1,1,1>
Next, it is determined whether or not the calculated weight value Wn1 is larger than a threshold value Wmt for determining the presence or absence of the sample article, that is, whether or not the sample article is placed on the stage S1 (step n703). When the value Wn1 is not larger than the threshold value Wmt, the process proceeds to step n706.

  In step n703, when the weight value Wn1 is larger than the threshold value Wmt, the weight value Wn1 is used as the weight value Wm when the weighing device is common (s = c), the rotational speed v = 1, and the weight value acquisition position i = 1. <C, 1, 1> In order to add up the weight values of the sample articles for each weight acquisition position i, the values are integrated in the integration register and the process proceeds to step n705 (step n704), and provided for each weight value acquisition position i. “1” is added to the count value of the counter, and the process proceeds to step n706.

  In step n706, the weight value Wa16 for the mounting table S16 is read by the WMR16 register. The zero point fluctuation component Czd <16,1,2> corresponding to the weighing device s = 16, the rotation speed v = 1, and the weight value acquisition position i = 2 corresponding to the mounting table S16 is called from the table (step n707).

  Using this zero point fluctuation component, the weight value Wn16 is calculated by the following equation, that is, zero point correction is performed (step n708).

Wn16 = K16 · (Wa16−Wi16) −Wz16−Czd <16,1,2>
Next, the process proceeds to step n709 in FIG. 19B, and it is determined whether or not the calculated weight value Wn16 is larger than the threshold value Wmt, that is, whether or not the sample article is placed on the stage S1 (step n709). When the weight value Wn1 is not larger than the threshold value Wmt, the process proceeds to step n712.

  In step n709, when the weight value Wn1 is larger than the threshold value Wmt, the weight value Wn16 is set to the weight value Wm of the weighing device common (s = c), the rotational speed v = 1, and the weight value acquisition position i = 2. <C, 1, 2> In order to add up the weight values of the sample articles for each weight acquisition position i, the values are integrated in the integration register and the process proceeds to step n711 (step n710), and provided for each weight value acquisition position i. “1” is added to the count value of the counter, and the process proceeds to Step n712.

  Hereinafter, the processing is similarly performed for the platforms S15, S14, S13, and S12 (step n712 to step n715), and the process proceeds to step n716 in FIG. 19C.

  In step n716, the weight value Wa11 for the mounting table S11 is read by the WMR11 register (step n716). The zero point variation component Czd <11,1,7> corresponding to the weighing instrument s = 11, the rotation speed v = 1, and the weight value acquisition position i = 7 corresponding to the mounting table S11 is called from the table (step n717). Using this zero point fluctuation component, the weight value Wn11 is calculated by the following equation, that is, zero point correction is performed (step n718).

Wn11 = K11 · (Wa11−Wi11) −Wz11−Czd <11,1,7>
Next, it is determined whether or not the calculated weight value Wn11 is larger than the threshold value Wmt (step n719). When the weight value Wn11 is larger than the threshold value Wmt, the weight value Wn11 is shared by the weighing instruments (s = c). In order to sum up the weight value of the sample product for each weight acquisition position i, the rotation speed v = 1 and the weight value acquisition position i = 7, the weight value Wm <c, 1,7>. Integration is performed and the process proceeds to step n721 (step n720), "1" is added to the count value of the counter provided for each weight value acquisition position i, and the process proceeds to step n722.

  In order to forcibly discharge the sample article on the mounting table at the distribution position (8), “1” is set in the distribution output memory MR10 of the mounting table S10 that approaches the distribution position (8) in the next system state. (Step n722). That is, the process proceeds to step n413 in FIG. 18B.

  In step n413 in FIG. 18B, it is determined whether or not the number of sample weight values measured at the weight value acquisition positions i = 1 to 7 is equal to or more than Q, which is a plurality of times. ,finish.

  If Q is greater than or equal to Q in step n413, the weight value accumulated in the accumulation register is divided by the count value of the counter for each weight value acquisition position i = 1 to 7, and the average value Wma <1, 1 > To Wma <1,7> (step n414), and the difference between the weight value M of the sample article and the calculated average values Wma <1,1> to Wma <1,7> is a dynamic weight correction value. D <1,1> to D <1,7> are registered in the memory table (step n415), and the integration register, counters Cm <1> to Cm <7>, and flag Fdm are reset and the process ends (step n416). .

  As described above, FIGS. 19A and 19B show an example in which the rotation speed v = 1 is set. Next, the dynamic speed correction value is set by setting the rotation speed v = 2 to 11, respectively. D <2,1> to D <2,7>, D <3,1> to D <3,7>, D <4,1> to D <4,7>, ... D <10,1> ˜D <10,7> and D <11,1> to D <11,7> are similarly calculated and registered in the memory table.

20A to 20E show processing of the program PG1 of the system state P1 in the operation operation of the present embodiment, and are flowcharts corresponding to the above-described FIGS. 17A to 17E, and corresponding steps have the same step numbers. The description is omitted.

  20A to 20E show an example in which the rotation speed v = 1 stage is set.

In step n602 of Fig. 20A, as above mentioned, with a zero point fluctuation component CZD <1, 1, 1>, calculates a weight value Wn1 to correct the amount zero point variation, it proceeds to step N660. In step n660, the weight correction amount D <c, 1,1> corresponding to the rotational speed v = 1 and the weight value acquisition position i = 1 is called from the table, and the weight value Wn1 is corrected by the following equation, The target weight value is corrected (step n661).

Wn1 '= Wn1 + D <c, 1,1>. (Wn1 / M)
Then, by converting the weight values Wn1' corrected display value level weight value Wd1 (step N603), proceeds to subsequent steps similar upper predicate N604.

In step n612 of FIG. 20B, as above mentioned, with a zero point fluctuation component Czd <16,1,2>, calculates a weight value Wn16 to correct the amount zero point variation, it proceeds to step N662. In step n662, the weight correction amount D <c, 1,2> corresponding to the rotational speed v = 1 and the weight value acquisition position i = 2 is called from the table, and the weight value Wn16 is corrected by the following equation, The target weight value is corrected (step n663).

Wn16 ′ = Wn16 + D <c, 1, 2> (Wn16 / M)
Then, by converting the weight values Wn16' corrected display value level weight value WD16 (step N613), it proceeds to subsequent steps similar upper predicate N614.

In step n624 of Fig. 20C, as above mentioned, with a zero point fluctuation component Czd <15,1,3>, calculates a weight value Wn15 to correct the amount zero point variation, proceeds to step N664. In step n664, the weight correction amount D <c, 1,3> corresponding to the rotational speed v = 1 and the weight value acquisition position i = 3 is called from the table, and the weight value Wn15 is corrected by the following equation, The target weight value is corrected (step n665).

Wn15 ′ = Wn15 + D <c, 1, 3> (Wn15 / M)
Then, by converting the weight values Wn15' corrected display value level weight value WD15 (step N625), it proceeds to subsequent steps similar upper predicate N626.

  Next, in step n633 of FIG. 20D, the same process including the correction of the dynamic weight value is performed for the stage S14, the same process is performed for the stage S13 in step n634, and further, in step n635, the stage is placed. The same processing is performed for S12, and the process proceeds to step n636 in FIG. 20E.

In step n636 of Fig. 20E, as above mentioned, with a zero point fluctuation component Czd <11,1,7>, calculates a weight value Wn11 to correct the amount zero point variation, it proceeds to step N666. In step n666, the weight correction amount D <c, 1,7> corresponding to the rotational speed v = 1 and the weight value acquisition position i = 7 is called from the table, and the weight value Wn11 is corrected by the following equation, The target weight value is corrected (step n666).

Wn11 ′ = Wn11 + D <c, 1, 7> (Wn11 / M)
Then, by converting the weight values Wn11' corrected display value level weight value WD11 (step N640), it proceeds to subsequent steps similar upper predicate N642.

(Other embodiments)
In each of the above-described embodiments, each stage of all the rotational speeds v = 1 to 11 used in the rotary weight sorter is individually set and operated for each set rotational speed. Although the zero point fluctuation component was calculated for each container and each weight value acquisition position, the zero point fluctuation component generated by the centrifugal force and the aerodynamic force changes in proportion to the square of the rotation speed.

  Therefore, when the difference between two adjacent rotation speeds is small, the zero point fluctuation component is assumed to change in proportion to the change in the rotation speed, and the number of rotation speed settings for the adjustment operation for detecting the zero point fluctuation component is reduced. For example, for v = 1 to 11 steps, v = 1, 4, 7, and 11 steps, and for zero to 4 steps, 4 to 7 steps, and 7 to 11 speed points As for the fluctuation component, the difference between the zero point fluctuation components at the two ends may be obtained by proportionally dividing the difference between the rotation speeds in the middle.

  Further, the zero point fluctuation component for each measuring instrument and for each weight acquisition position may be expressed as a function of the rotational speed by a method such as a least square method.

  If the rotational speed is set using a numerical value (rpm) that directly represents the rotational speed instead of a step value, two values are calculated based on the zero point fluctuation component acquired according to the rotational speed set at the time of the adjustment operation. The zero point fluctuation component at an arbitrary rotational speed between the rotational speeds can be calculated with a proportional distribution as described above.

  Also, during operation, instead of obtaining the zero fluctuation component based on the set rotation speed value, it is equipped with a rotation speed detecting means, and the zero fluctuation is caused by the rotation speed of the measuring instrument detected by the actual rotation speed detecting means. The component may be obtained.

  As an example of this rotational speed detection means, for example, in the process of FIG. 11A described above, which is executed with the highest priority at a time interval of 1 msec, the system state Px = 1 is set, and then the system state Px = 11 is set. Until the system state changes to Px = 11, the counter value is moved to the rotation speed memory register and an operation for resetting the counter is executed. When reading the rotational speed, if the value stored in the rotational speed memory register is read, this value represents the required time between 10/16 rotations, so that the rotational speed can be calculated.

  In each of the above-described embodiments, the zero-point fluctuation component is obtained for each rotation speed, weighing instrument, and weight acquisition position. However, the above-described part that causes a vibration signal on the rotating shaft equipped with the turntable equipped with the weighing instrument. If the vibration signal generated by the mechanical impact force acting on the rotating bearing mechanism at a specific position on the rotating circle can be ignored in terms of weighing accuracy, You may make it obtain | require for every rotation speed and a weight value acquisition position as a common value.

  In each of the embodiments described above, the zero point drift correction weight acquisition position has been described as the Iz position where the article is not supplied. For example, when the weight value is equal to or less than the threshold value, the article placement that determines that there is no article placement is performed. When a detection means is provided, another position such as the weight acquisition position of the article, for example, the above-described weight acquisition position I7 may be used as the zero point drift correction weight acquisition position.

  In each of the embodiments described above, a plurality of article weight acquisition positions are provided in addition to the zero point drift correction weight acquisition position Iz. However, as in the conventional example of FIG. Also good.

  In the above-described embodiment, the present invention is applied to a rotary weight sorter. However, the present invention is not limited to a weight sorter, and may be applied to a rotary weight filling device and other rotary weighing devices. .

1 rotary Checkweigher 2 turntable 4 supply conveyor 5 _{1-5 16} load sensor ₆₁ through ₁₆ measurement unit 9 arithmetic circuit 11 central control unit 18 the arithmetic control circuit 21 displays setting unit 24 input unit 25 display unit S1~S16 Stand

Claims (7)

Drive means for rotating the measuring instrument along a circumference around the center of rotation, and the weight of the article is determined based on a load signal from the measuring instrument supplied with the article at a supply position on the circumference. A rotary weighing device for measuring,
Weight acquisition means for acquiring a weight value based on a load signal from the weighing instrument;
A stationary zero-point weight value based on a load signal from a weighing instrument that is in an unloaded state in which the article is not supplied and is acquired by the weight acquisition unit, and on the circumference by the weight acquisition unit The weight acquisition is performed using, as a zero-point fluctuation component, a difference from a dynamic zero-point weight value based on a load signal from the rotating measuring device in the no-load state acquired at a plurality of weight acquisition positions. Storage means for storing in advance for each position;
And zero point weight correction means for correcting the weight value acquired at the plurality of weight acquisition positions by the weight acquisition means for each weight acquisition position based on the zero point fluctuation component stored in advance in the storage means. ,
The storage means stores in advance a dynamic correction value for each weight acquisition position,
The dynamic correction value is a state in which a sample article having a known weight, which is acquired at the plurality of weight acquisition positions by the weight acquisition unit, is supplied to the measuring instrument, and from the rotating measuring instrument. An error between the dynamic weight value of the sample article based on the load signal of the dynamic weight value corrected based on the zero point fluctuation component by the zero point weight correction means and the known weight,
The zero-point weight correcting means converts the weight value corrected for each weight acquisition position based on the zero-point fluctuation component into the corrected weight value, the known weight, and the dynamic value stored in advance in the storage means. Further, the zero point weight correction means corresponds to the corrected weight value based on the corrected weight value and the known weight. It is converted into a dynamic weight correction value, and based on the dynamic weight correction value, the corrected weight value is further corrected.
A rotary weighing device characterized by that. A plurality of the measuring instruments;
The storage means is acquired at the plurality of weight acquisition positions by the weight acquisition means and the stationary zero-point weight value acquired by the weight acquisition means based on a load signal from the stationary weighing instrument in the unloaded state. The difference from the dynamic zero point weight value based on the load signal from the rotating measuring instrument in the no-load state is stored in advance as the zero point fluctuation component for each weight acquisition position and for each measuring instrument. And
The zero point weight correction unit is configured to calculate the weight value acquired at the plurality of weight acquisition positions by the weight acquisition unit based on the zero point fluctuation component stored in the storage unit in advance, and It corrects for each measuring instrument.
The rotary weighing device according to claim 1. The drive means rotates the measuring instrument at different rotational speeds,
The storage means is acquired at the plurality of weight acquisition positions by the weight acquisition means and the stationary zero-point weight value acquired by the weight acquisition means based on a load signal from the stationary weighing instrument in the unloaded state. The difference from the dynamic zero-point weight value based on the load signal from the rotating measuring instrument in the unloaded state is used as the zero-point fluctuation component for each weight acquisition position and for each measuring instrument. Is stored in advance according to the rotation speed of
The zero point weight correction unit is configured to calculate the weight value acquired at the plurality of weight acquisition positions by the weight acquisition unit based on the zero point fluctuation component stored in the storage unit in advance, and For each measuring instrument, correction is made according to the rotational speed.
The rotary measuring device according to claim 1 or 2. The plurality of weight acquisition positions acquire a zero-point weight acquisition position for acquiring a zero-point weight value of the weighing instrument in an unloaded state during operation, and a weight value of the article supplied to the weighing instrument at the supply position. Including an article weight acquisition position to be
The rotary weighing device according to any one of claims 1 to 3. Drive means for rotating the measuring instrument along a circumference around the center of rotation, and the weight of the article is determined based on a load signal from the measuring instrument supplied with the article at a supply position on the circumference. A zero variation correction method for a rotary weighing device to be measured,
A first step of obtaining a stationary zero-point weight value based on a load signal from a weighing instrument that is in an unloaded state where the article is not supplied and is stationary during the adjustment operation;
A second step of acquiring a dynamic zero-point weight value based on a load signal from the rotating measuring instrument in the unloaded state at a plurality of weight acquisition positions on the circumference during the adjustment operation;
A third step of storing the difference between the acquired stationary zero point weight value and the dynamic zero point weight value of the plurality of weight acquisition positions as a zero point fluctuation component for each of the weight acquisition positions;
In the third operation, the dynamic weight value of the sample article based on the load signal from the rotating measuring instrument is in a state where a sample article of a known weight is supplied to the measuring instrument during the adjustment operation. A fourth step of acquiring the dynamic weight value of the sample article for each of the plurality of weight acquisition positions, corrected based on the zero point variation component stored in
A fifth step of storing, as a dynamic correction value, an error between the dynamic weight value of the sample article acquired in the fourth step and the known weight for each of the plurality of weight acquisition positions;
During operation, the weight value based on the load signal from the weighing instrument acquired at the plurality of weight acquisition positions is corrected for each weight acquisition position based on the zero point fluctuation component stored in the third step. And a sixth step
During the operation operation, the weight value corrected in the sixth step is determined for each weight acquisition position based on the corrected weight value, the known weight, and the dynamic correction value stored in the fifth step. to, look including a seventh step of further correcting,
In the seventh step, the dynamic correction value is converted into a dynamic weight correction value corresponding to the corrected weight value based on the corrected weight value and the known weight, and the dynamic weight correction value And further correcting the corrected weight value based on
A zero-point fluctuation correction method for a rotary weighing device. A plurality of the measuring instruments;
In the third step, the zero point fluctuation component is stored for each weight acquisition position and for each weighing instrument,
In the sixth step, a weight value based on load signals from the plurality of weighing devices acquired at the plurality of weight acquisition positions is determined for each weight acquisition position based on the stored zero point fluctuation component, and , Correct for each weighing instrument,
The zero point fluctuation | variation correction method of the rotary type measuring apparatus of Claim 5. The drive means rotates the measuring instrument at different rotational speeds,
In the third step, the zero point fluctuation component is stored according to the rotation speed for each weight acquisition position and for each weighing instrument,
In the fourth step, the dynamic weight value of the sample article is acquired according to the rotation speed for each of the plurality of weight acquisition positions,
In the fifth step, an error between the dynamic weight value of the sample article acquired in the fourth step and the known weight is used as a dynamic correction value according to the rotation speed for each of the plurality of weight acquisition positions. Remember,
In the sixth step, a weight value based on load signals from the plurality of weighing devices acquired at the plurality of weight acquisition positions is determined for each of the weight acquisition positions based on the stored zero point fluctuation component. Correct according to the rotation speed,
In the seventh step, the weight value corrected in the sixth step is acquired based on the corrected weight value, the known weight, and the dynamic correction value stored in the fifth step. For each position, further correction according to the rotational speed,
The zero point fluctuation | variation correction method of the rotary type measuring device of Claim 5 or 6.

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