JP6137968B2 - Weighing device - Google Patents

Description

  The present invention relates to a weighing device. In particular, the present invention adjusts the objects to be weighed such as powders (detergents, fertilizers, etc.) and granules (resin pellets, grains, feeds, etc.) to a predetermined target weight and packer scales for filling containers such as bags. Relates to the weighing device.

  Packer scales are used to efficiently pack resin pellets, etc., which are raw materials for resin molding, into a target weight. This packer scale is an automatic weighing device that adjusts the objects to be weighed such as powders (detergents, fertilizers, etc.) and granules (resin pellets, grains, feeds, etc.) to a predetermined target weight and fills them in containers such as bags. It is a kind. Such a weighing device is generally composed of various devices such as a charging chute, a hopper, a hopper gate, a load cell, and an actuator, and various methods have been proposed according to the purpose of use.

  For example, when a weighing object less than the target weight of the object to be weighed is supplied, the object to be weighed is weighed and the weighing object after weighing is discharged, and the target weight and large loading There is known a weighing device including a plurality of medium throw-in weighing hoppers for discharging a difference from an object to be weighed discharged from the weighing hopper using a combination calculation (see, for example, Patent Document 1). Furthermore, in such a weighing device, as a configuration for reducing the error between the target weight and the weighing weight and performing high-precision weighing, the volume of the object to be weighed into the hopper and the replenishment charging by loss-in discharging, Devices that are intended to increase the speed and accuracy of weighing objects are also known (see, for example, Patent Document 2).

JP-A-8-278189 Japanese Laid-Open Patent Publication No. 10-54750

  However, the loss-in discharge has a problem that the measurement accuracy cannot be increased unless a very small amount of an object to be weighed is put in over a period of time. In other words, since the measurement accuracy cannot be increased when attempting to increase the measurement speed, it is difficult to increase the measurement speed in the configuration using the loss-in discharge.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a weighing device that can increase the weighing speed while maintaining high weighing accuracy.

  In order to solve the above-described problem, the weighing device according to the present invention measures the object to be weighed and discharges the object to be weighed after weighing by supplying the object to be weighed less than the target weight. A large input weighing hopper and an object to be weighed whose weights are adjusted at different ratios are respectively supplied to perform a combination operation based on the weight of the object to be weighed, and based on a result of the combination operation, A plurality of medium input weighing hoppers for discharging the weighing object, and the target input weight of the medium input weighing hopper having the smallest adjusted weight ratio among the plurality of medium input weighing hoppers is discharged by the entire weighing device. The weight is set to be equal to or less than an allowable error between the weight of the object to be weighed and the target weight.

  According to the above configuration, it is possible to make many types of different combination weights so that the minimum target input weight of the medium input weighing hopper is the lower limit and the maximum total value of the target input weights of the medium input weighing hopper is covered. Therefore, it is possible to increase the measurement speed while maintaining high measurement accuracy. In addition, since the design for minimizing the number of medium throw-in weighing hoppers can be easily performed, it is possible to prevent the apparatus from becoming large and expensive.

  The plurality of middle throw-in weighing hoppers may be configured such that there are seven or more types of weight ratios to be adjusted. According to this, after weighing most of the target weight using the large input weighing hopper, the combination calculation is performed based on the objects to be weighed in each of the multiple medium input weighing hoppers so that the weight ratio becomes 7 or more. Is done. Thus, by performing the combination calculation from seven or more weight ratios, the error from the target weight can be reduced without separately performing loss-in weighing.

  Each of the plurality of medium throw-in weighing hoppers may have a target throw weight set so that the ratio of the weight to be adjusted is a geometric sequence with a common ratio of 2. Thereby, different types of combination weights can be made maximally with a difference in the minimum target input weight so as to cover the maximum total value of the target input weights of the medium input weighing hopper.

  In the plurality of middle input weighing hoppers, the total value of the target weighing weights of the plurality of middle input weighing hoppers is the maximum value of the target weight value of the combination calculation by the plurality of middle input weighing hoppers and the large input weighing hopper. You may comprise by the minimum number which becomes more than a total value with the upper limit of the allowable measurement error. As a result, it is possible to reduce the number of medium throw-in weighing hoppers as much as possible while ensuring that proper weighing is performed in weighing using the combination calculation, thereby preventing an increase in the size of the device and reducing costs. it can.

  The plurality of medium throw-in weighing hoppers are weighed after the weighing object is put into the large throw-in weighing hopper and before the weight of the weighing object put into the large throw-in weighing hopper is weighed. You may be comprised so that a thing may be thrown in. As a result, the weighing speed of the entire packer scale can be increased without wasting the weighing stabilization period of the large input weighing hopper.

  Each of the plurality of medium throw-in weighing hoppers may be composed of four or more weighing hoppers each having one load cell and a holding part for an object to be weighed divided into two sections. According to this, since the medium throw-in weighing hopper that weighs an object to be weighed having seven or more kinds of weight ratios can be configured with substantially half the weighing hopper, it is possible to suppress an increase in the size of the weighing device.

  The weighing device includes: an input chute that supplies an object to be weighed to the large input weighing hopper; and a relay unit configured to be able to supply an object to be weighed from the input chute to each of the plurality of medium input weighing hoppers. The relay unit may include a cut gate that distributes the input of the objects to be weighed to be inserted into each section of the holding unit. According to this, the objects to be weighed supplied from the charging chute are distributed and input to each holding portion of each medium charging weighing hopper using the cut gate. As a result, an object to be weighed can be thrown into each holding portion of the medium throw-in weighing hopper having a simple structure and a structure divided into two easily and reliably.

  The relay portion includes a hollow communication portion provided corresponding to each of the intermediate charging weighing hoppers so that an object to be weighed passes in a vertical direction, and corresponds to each of the holding portions below the communication portion. The area of the discharge port provided may be larger as the discharge port inserted into the holding unit having a large weight ratio adjusted by the combination calculation. As a result, the time for opening the cut gate (open time) can be made closer to each other regardless of the input amount (target input weight) of the objects to be weighed in the holding units.

  The plurality of medium throw-in weighing hoppers may be set so that the holding portion with a smaller target throwing weight is combined with the holding portion with a larger target throwing weight. Thereby, it is possible to prevent the total amount of the target thrown weights that are put into the two holding portions of one middle throw-in weighing hopper from differing as much as possible depending on the middle throw-in weighing hopper.

  The weighing device may include a plurality of the large input weighing hoppers. According to this, since a plurality of large throw-in weighing hoppers are provided, it is possible to shift the input, weighing and discharge timings of the objects to be weighed for each large throw-in weighing hopper. As a result, it is possible to perform the input or discharge processing of the objects to be weighed in the other one large input weighing hopper during the measurement stabilization period in the one large input weighing hopper. Speed can be increased.

  The present invention is configured as described above, and has an effect that weighing can be performed in a short time while improving weighing accuracy.

FIG. 1 is a conceptual diagram schematically showing the configuration of a weighing device according to the first embodiment of the present invention. FIG. 2 is a front view showing an arrangement example of each weighing hopper in the weighing apparatus shown in FIG. FIG. 3 is a top view of the weighing device shown in FIG. FIG. 4 is a conceptual diagram schematically showing the configuration of the weighing device according to the second embodiment of the present invention. FIG. 5 is a front view showing an arrangement example of each weighing hopper in the weighing apparatus shown in FIG. 6 is a top view of the weighing device shown in FIG. FIG. 7 is an enlarged view of the vicinity of the middle throw-in weighing hopper in the weighing apparatus shown in FIG. FIG. 8 is a conceptual diagram schematically showing the configuration of the weighing device according to the third embodiment of the present invention.

  Hereinafter, a specific configuration example of the weighing device according to the embodiment of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all of the drawings, and redundant description thereof may be omitted. Further, the following specific description merely illustrates the features of the weighing device according to the present invention. For example, when the following specific examples are described with appropriate reference numerals attached to the same or corresponding terms as the terms specifying the weighing device, the specific components are those of the corresponding weighing device. It is an example of a component. Therefore, the features of the weighing device are not limited by the following specific description.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS. The packer scale 101 that is a weighing device of the present embodiment includes a large input weighing unit 10 that performs large input (large amount input) of an object to be weighed (for example, resin pellets) to a packaging machine (not shown), and a packaging machine. The medium input weighing unit 20 in which the medium to be weighed in (medium amount input) is performed, the object to be weighed by the large input weighing unit 10 and the object to be weighed by the medium input weighing unit 20 A collecting chute 30 is also provided for discharging to the packaging machine.

  For convenience of the following explanation, in FIG. 1, the direction in which the objects to be weighed are distributed from the middle of the large input weighing unit 10 to the middle input weighing unit 20 is “left-right direction”. Further, in FIG. 1, for easy understanding, it is described that a large throw-in weighing hopper and a medium throw-in weighing hopper, which will be described later, are all arranged in a horizontal row, but in actuality, FIG. 2 and FIG. As shown, the three-dimensional arrangement is preferable from the viewpoint of miniaturization of the entire weighing device.

[Large input weighing unit]
The large input weighing unit 10 is provided with a plurality of (two in the present embodiment) in which the objects to be weighed are measured and the objects to be weighed are discharged after the objects to be weighed less than the target weight are supplied. Large input weighing hoppers 11L, 11R, and an input chute 12 for supplying an object to be weighed to a plurality of large input weighing hoppers 11L, 11R. The plurality of large throw-in weighing hoppers 11L and 11R are suspended and held by a packer scale frame (not shown) via a load cell 15 (see FIG. 2) below the throw chute 12, respectively. In FIG. 2, two load cells 15 are respectively attached in front of the large throw-in weighing hoppers 11L and 11R. However, two load cells 15 are similarly located behind the large throw-in weighing hoppers 11L and 11R. The large throw-in weighing hoppers 11L and 11R are suspended and held by a total of four load cells 15, respectively. The number of load cells 15 is not limited to this, and may be 3 or less, for example, or 5 or more.

  The charging chute 12 includes a hollow communication portion 13 through which an object to be weighed passes in the vertical direction, and a cut gate that distributes an object to be weighed into each of the plurality of large input weighing hoppers 11L and 11R below the communication portion 13. I have. In the present embodiment, the cut gate is configured as a plurality (two) of cut gates 14L, 14R provided to correspond to a plurality (two) of large input weighing hoppers 11L, 11R.

  The communication portion 13 is configured such that at least the lower end portion is divided according to the input ports 11La and 11Ra of the objects to be weighed of the large input weighing hoppers 11L and 11R. Specifically, the two large throw-in weighing hoppers 11L and 11R are arranged on the left and right below the communicating portion 13 of the throwing chute 12, and the communicating portion 13 is provided with a partition plate 13a for dividing the inside into left and right. Yes.

  Further, the lower end portion of the communication portion 13 is a communication portion partitioned by a partition plate 13a so as to correspond to the size of the input ports 11La, 11Ra of the objects to be weighed of the large input weighing hoppers 11L, 11R located below. It has a funnel shape (tapered shape) so that the area of the horizontal cross section in each of the 13 internal spaces becomes smaller as it goes downward.

  The cut gates 14L and 14R are configured to be rotatable around the rotation shafts 14La and 14Ra, respectively. When the cut gates 14L and 14R rotate about the rotation shafts 14La and 14Ra, an open state in which an object to be weighed is input to the large input weighing hoppers 11L and 11R corresponding to the cut gates 14L and 14R, and a large input measurement The closed state in which the input of the objects to be weighed into the hoppers 11L and 11R is switched (FIG. 1 shows the case where the cut gate 14L is in the open state and the cut gate 14R is in the closed state). The cut gates 14L and 14R are configured to be selectively opened (in an open state). In the present embodiment, the rotary actuators 16L and 16R for independently rotating the cut gates 14L and 14R around the respective rotation shafts 14La and 14Ra are provided, and the rotation can be controlled independently. It is possible.

  The large input weighing hoppers 11L and 11R temporarily hold the objects to be weighed in the communication parts 11Lb and 11Rb, and the communication parts 11Lb and 11Rb through which the objects to be weighed introduced from the upper input ports 11La and 11Ra circulate, Discharge gates 11Lc and 11Rc for discharging downward are provided.

  The large throw-in weighing hoppers 11L and 11R in the present embodiment are constituted by two weighing hoppers having the same capacity. For example, each of the large input weighing hoppers 11L and 11R is configured to be able to weigh an object to be weighed of about 25 kg. The weighing error of the large throw-in weighing hoppers 11L and 11R is set to ± 100 g, for example. About 98% of the target weight of the object to be weighed is weighed by such large input weighing hoppers 11L and 11R.

  In the large throw-in weighing unit 10 having such a configuration, an object to be weighed is thrown into each of the large throw-in weighing hoppers 11L and 11R through the internal spaces separated from the throw chute 12 by the partition plate 13a. At this time, the cut gates 14L and 14R provided at the discharge ports of the charging chute 12 are opened for a predetermined time so that a predetermined weight less than the target weight is input, so that the object to be weighed is largely input. It is put into the weighing hoppers 11L and 11R. Further, since the cut gates 14L and 14R are alternately opened, the objects to be weighed are alternately fed into the large throw-in weighing hoppers 11L and 11R, and are sequentially weighed by the corresponding load cells 15. In other words, with one cut gate 14R closed, the other cut gate 14L is opened for a predetermined time, and the object to be weighed is introduced into the corresponding large throw-in weighing hopper 11L, and the article to be weighed in the large throw-in weighing hopper 11L Weigh the weight.

  Here, in particular, in the packer scale 101 for adjusting the objects to be weighed such as powder (detergent, fertilizer, etc.) and granules (resin pellets, grains, feed, etc.) to a predetermined target weight, filling per bag Since it is necessary to weigh a heavy object whose amount is, for example, several tens of kilograms, the large input weighing hopper 11L, 11R that covers most of the weighing is used to ensure its size and strength. Many of the 11Rs are heavy, and for example, there are some large weighing hoppers 11L, 11R having a weight of 50 kg or more. Therefore, it takes a relatively long time for the impact caused by the objects to be weighed in the large throw-in weighing hoppers 11L and 11R to be settled to some extent and to be stably weighed.

  Therefore, for example, in the weighing stabilization period from when the object to be weighed is introduced into one large input weighing hopper 11L until the object to be weighed in the large input weighing hopper 11L is weighed, the other large input weighing hopper The cut gate 14R corresponding to 11R is opened, and a process of feeding an object to be weighed into the large throw-in weighing hopper 11R is performed. Then, in the weighing stabilization period of the other large throw-in weighing hopper 11R, the large throw-in weighing hopper 11L that has finished the weighing stabilization period weighs the object to be weighed into the large throw-in weighing hopper 11L and discharges it after weighing. The gate 11Lc is opened and the weighed object is discharged. Further, the large input weighing hopper 11L that has discharged the object to be weighed closes the discharge gate 11Lc and opens the corresponding cut gate 14L for a predetermined time so as to input the object to be weighed for the next time. Put the object to be weighed into. During this time, the weighing stabilization period ends in the large throw-in weighing hopper 11R. As a result, the weighed objects can be alternately discharged from the two large throw-in weighing hoppers 11L and 11R. In addition, by opening the discharge gates 11Lc and 11Rc of the large input weighing hoppers 11L and 11R, the objects to be weighed are sent to the packaging machine via the collecting chute 30.

[Medium input weighing unit]
The intermediate input weighing unit 20 performs a combination operation based on the weight of the objects to be weighed by supplying the objects to be weighed with the weights of the objects to be weighed adjusted at different ratios, and based on the result of the combination operation. A plurality of (seven in FIG. 1) medium input weighing hoppers 21A to 21G from which the objects to be weighed are discharged. The seven medium throw-in weighing hoppers 21A to 21G are configured such that the ratios of the weights to be adjusted (target throw weights) are different from each other. As a result, there are seven weight ratios (target values) adjusted by the combination calculation.

  Further, the medium throw-in weighing unit 20 includes relay units 22L and 22R that supply the objects to be weighed thrown into the throw chute 12 of the large throw-in weighing unit 10 to the medium throw-in weighing hoppers 21A to 21G. The relay portions 22L and 22R are hollow, branched upstream such that the upstream side communicates with the side of the charging chute 12 and the downstream side is positioned above the medium charging weighing hoppers 21A to 21D and 21E to 21G. It has relay part main bodies 22La and 22Ra. Moreover, the relay parts 22L and 22R have cut gates 22Ab to 22Gb provided at the respective outlets. The cut gates 22Ab to 22Gb are configured to be rotatable around the rotation shafts 22Ac to 22Gc, respectively. When the cut gates 22Ab to 22Gb are rotated about the rotation shafts 22Ac to 22Gc, an open state in which an object to be weighed 21A to 21G corresponding to each of the cut gates 22Ab to 22Gb and an intermediate input weighing are provided. The closed state for restricting the input of the objects to be weighed into the hoppers 21A to 21G is switched.

  The middle throwing weighing hoppers 21A to 21G are respectively connected to hollow communication portions 21Ab to 21Gb having loading ports 21Aa to 21Gb through which the objects to be weighed are thrown from above via relay portions 22L and 22R, and in the communication portions 21Ab to 21Gb. Are provided with discharge gates 21Ac to 21Gc for temporarily holding the objects to be weighed and discharging them downward.

  Each of the plurality of middle throw-in weighing hoppers 21 </ b> A to 21 </ b> G includes seven weighing hoppers each having one load cell 23.

  In the medium throw-in weighing unit 20 having such a configuration, an object to be weighed is thrown into each of the medium throw-in weighing hoppers 21A to 21G via the throwing chute 12 via the relay units 22L and 22R. At this time, adjustment is performed so that a predetermined weight of an object to be weighed is put into each of the middle throw-in weighing hoppers 21A to 21G so that the ratios of the weights to be thrown are different from each other. Specifically, the opening times of the cut gates 22Ab to 22Gb provided at the discharge ports of the relay units 22L and 22R are different from each other, and the areas of the discharge ports of the relay units 22L and 22R are This is realized by making it differ according to the ratio of the weights charged into the intermediate charging weighing hoppers 21A to 21G (for example, in proportion to the ratio).

  In the present embodiment, the medium input weighing hopper having the smallest adjusted weight ratio among the plurality of medium input weighing hoppers 21A to 21G is between the weight of the object to be weighed discharged on the entire packer scale and the target weight. The weight less than the allowable error is set as the target input weight. In the present embodiment, the allowable error of the packer scale 101 is set to 5 g, and the minimum target input weight is set to 5 g which is the same as the allowable error.

  Further, the maximum value of the weight to be weighed by the medium charging weighing hopper is set to 600 g. As described above, when the target weight of the entire packer scale 101 is 25 kg, when 98% of the target weight is weighed by the large input weighing hoppers 11L and 11R, the weight that the medium input weighing hoppers 21A to 21G should input is the target. 500 g which is 2% of the weight. Assuming that the weighing error of the large throw-in weighing hoppers 11L and 11R is ± 100 g, the maximum value to be weighed by the medium throw-in weighing hoppers 21A to 21G (the maximum total value of the target throwing weights) is 500 + 100 = 600 g.

  The difference between the minimum target input weight (5 g) while covering the maximum value 600 g of the weight to be weighed by the medium input weighing hopper with the minimum target input weight 5 g of the medium input weighing hopper set in this way as the lower limit. In order to maximize the types of different combination weights, it is preferable to set the target input weight of each of the medium input weighing hoppers so that the ratio of the adjusted weight is a geometric sequence with a common ratio of 2. As described above, when the target input weight of the medium input weighing hopper having the smallest adjusted weight ratio among the plurality of medium input weighing hoppers is 5 g, the medium input weighing hoppers 21A to 21G in the present embodiment are It is comprised so that it may become 5g, 10g, 20g, 40g, 80g, 160g, 320g in order with small input weight. At this time, the total value of the target throwing weights of the middle throwing weighing hoppers 21A to 21G is 635 g, and the weight to be thrown by the middle throwing weighing hoppers 21A to 21G is taken into account the weighing error of the large throwing weighing hoppers 11L and 11R. Can cover well.

  As described above, in the plurality of middle input weighing hoppers used for the combination calculation, the total value (635 g in the above example) of the respective target weighing weights of the plurality of middle input weighing hoppers is determined by the plurality of middle input weighing hoppers. The total value (the above example) of the maximum value (500 g in the above example) of the target weight value of the combination calculation and the upper limit value (100 g in the above example) of the weighing error allowed in the large input weighing hoppers 11L and 11R In the above example, the minimum number (seven in the above example) is 600 g) or more. As a result, it is possible to reduce the number of medium throw-in weighing hoppers as much as possible while ensuring that proper weighing is performed in weighing using the combination calculation, thereby preventing an increase in the size of the device and reducing costs. it can. Further, by setting the number of medium throw-in weighing hoppers and the respective target weighing weights based on such an idea, it is possible to easily perform an optimal design according to the target weighing weight.

  In the present embodiment, each of the cut gates 22Ab to 22Gb is set according to the target weighing weight and the weight of the weighing object that falls per unit time when the weighing object is put into the corresponding middle throwing weighing hoppers 21A to 21G. The gate is configured to be opened only during the gate opening time. In this case, when the medium throw-in weighing unit 20 throws an object to be weighed into the medium throw-in weighing hoppers 21A to 21G, first, during the gate opening time set in the corresponding cut gate 22Ab to 22Gb, the cut gate 22Ab ~ 22Gb is opened, and the objects to be weighed are put into the medium throw-in weighing hoppers 21A to 21G. After the gate opening time has elapsed, the cut gates 22Ab to 22Gb close the gate. The intermediate input weighing unit 20 measures the weight of the objects to be weighed in the intermediate input weighing hoppers 21 </ b> A to 21 </ b> G into which the objects to be weighed have been charged after a predetermined measurement stabilization period has elapsed after the objects to be weighed are added, I do.

  Further, in the present embodiment, in order to realize the target input weight, for example, the gate opening time of each of the cut gates 22Ab to 22Gb corresponding to the medium input weighing hoppers 21A to 21G is shortened as the target input weight is small. Set to Furthermore, the area of each discharge port of the relay units 22L and 22R is made different according to the ratio of the weight put into the corresponding medium throw-in weighing hoppers 21A to 21G (for example, in proportion to the ratio). As described above, the ratio of the target input weights of the objects to be weighed (targeted for the combination calculation) is 1: 2: 4: by making the target input weights different in the seven medium input weighing hoppers 21A to 21G. 8: 16: 32: 64.

  The maximum capacity of the intermediate charging weighers 21A to 21G may be the same (as long as at least the maximum 320 g has a capacity that can be measured), but depending on the target charging weight, the intermediate charging weighers 21A to 21G It is good also as varying the maximum capacity of. For example, the intermediate input weighing hoppers 21A to 21D for measuring 5 g, 10 g, 20 g, and 40 g use weighing hoppers having a maximum capacity of 0.5 liters, and the intermediate input weighing hoppers 21E for measuring 80 g and 160 g are used. 21F may use a weighing hopper having a maximum capacity of 1 liter, and the medium throw-in weighing hopper 21G for weighing 320 g may use a weighing hopper having a maximum capacity of 2 liters. Thus, by using the weighing hoppers having different maximum capacities according to the target throwing weight as the middle throwing weighing hoppers 21A to 21G, it is possible to prevent the packer scale 101 from being enlarged.

  In the present embodiment, among the seven medium throw-in weighing hoppers 21A to 21G, four medium throw-in weighing hoppers 21A to 21D configured as weighing hoppers having a small maximum capacity are large throw-in as shown in FIGS. Arranged in a line in the front-rear direction on the left side of the weighing unit 10, and the remaining three middle input weighing hoppers 21 </ b> E to 21 </ b> G having a larger maximum capacity are aligned in the front-rear direction on the right side of the large input weighing unit 10. It arrange | positions so that it may become. As described above, the placement area of the packer scale 101 can be reduced by efficiently arranging the medium throw-in weighing hoppers 21 </ b> A to 21 </ b> G in a line in the front-rear direction on the left and right sides on the side of the large throw-in weighing unit 10. Can do.

  Then, the objects to be weighed put in each of the medium throw-in weighing hoppers 21A to 21G are weighed, and the combination calculation is performed using the weighed weights, and any of the large throw-in weighing hoppers 11L and 11R is calculated from the target weight. The combination closest to the remaining weight obtained by subtracting the weight of the object weighed by one is calculated. As a result of the combination calculation, the discharge gates 21Ac to 21Gc of the medium input weighing hopper selected for the combination are opened, and the objects to be weighed selected for the combination are sent to the packaging machine via the collecting chute 30. According to the medium input weighing hoppers 21A to 21G having the target input weight as in the above example, together with the large input weighing hoppers 11L and 11R, it becomes possible to measure and discharge with an accuracy of ± 5 g with respect to the target weight.

  Such a combination calculation is performed in a time-overlapping manner with the input of the objects to be weighed into the large throw-in weighing hoppers 11L and 11R and the weighing process. Specifically, the charging cycle of the large charging weighing hoppers 11L and 11R is set based on the measuring cycle in the medium charging weighing hoppers 21A to 21G. For example, after an object to be weighed is put into one large throw-in weighing hopper 11L and the weighing stabilization period has elapsed, the weight of the object to be weighed thrown into the large throw-in weighing hopper 11L is measured. Then, a state in which an object to be weighed is put into each of the middle throwing weighing hoppers 21A to 21G. The weight to be weighed in the large throw-in weighing hopper 11L is weighed so that the weight to be weighed by the medium throw-in weighing hoppers 21A to 21G (the value obtained by subtracting the measured value in the large throw-in weighing hopper 11L) Is calculated, and the combination calculation is performed so as to obtain the weight. During this time, the weighing object is discharged from the large throw-in weighing hopper 11L, and the weighing object is thrown in the other large throw-in weighing hopper 11R, and the weighing stabilization period is started. One or a plurality of middle throwing weighing hoppers 21A to 21G selected for the combination calculation discharges the objects to be weighed, and then opens the corresponding cut gates 22Ab to 22Gb, thereby emptying the middle throwing weighing hoppers 21A to 21G. A new object to be weighed is introduced into 21G. Thereby, the combination calculation is always performed using all of the seven medium throw-in weighing hoppers 21A to 21G after the next time. Then, the next time, based on the weight of the object to be weighed put into the other large input weighing hopper 11R whose measurement stabilization period has ended (so that the value obtained by subtracting the measured value in the large input weighing hopper 11R from the target weight). ) Combination calculation is performed.

  According to the above configuration, since the plurality of large throw-in weighing hoppers 11L, 11R are provided, the timing of charging, weighing, and discharging the objects to be weighed can be shifted for each large throw-in weighing hopper 11L, 11R. Thereby, in the weighing stabilization period in one large throw-in weighing hopper (one of 11L and 11R), an object to be weighed or discharged in another large throw-in weighing hopper (the other of 11L and 11R) Therefore, the overall weighing speed in the plurality of large throw-in weighing hoppers 11L and 11R can be increased. In addition, by weighing the objects to be weighed into the large input weighing hoppers 11L and 11R until the weight of the objects to be weighed is weighed, the large input weighing hoppers 11L , 11R, the measuring speed of the entire packer scale 101 can be increased without wasting the measuring stabilization period.

  Furthermore, according to the above configuration, each large throw-in metering is performed at the lower end portion in the vicinity of the cut gates 14L and 14R while the communication portion 13 through which the object to be weighed passes in the throw chute 12 is shared by the plurality of large throw-in weighing hoppers 11L and 11R. The shape is divided according to the inlets 11La and 11Ra of the objects to be weighed in the hoppers 11L and 11R. Thereby, the structure of the upper part of the large throw-in weighing hoppers 11L and 11R can be simplified, and the weighing speed can be increased while suppressing the enlargement of the entire packer scale 101.

  For example, when two large throw-in weighing hoppers are provided, if two throw chutes are simply provided above each large throw-in weighing hopper, the installation area of the entire packer scale is greatly increased. In order to solve this, it is conceivable to reduce the horizontal cross-sectional area of the internal space of the input chute, but if this is done, the volume of the object to be weighed temporarily stored in the internal space of each input chute becomes small. It is necessary to maintain the volume of each input chute by increasing the height of the input chute. When the height of the input chute becomes high, the problem is that the place where the packer scale is installed is limited, and the risk and inefficiency of work increases due to the need to input the object to be weighed from a higher position. obtain. Therefore, the charging chute 12 itself has one diameter (the diameter is slightly larger than that of a single large charging weighing hopper), and the internal space is divided into large charging weighing hoppers 11L and 11R, An increase in the installation area of the packer scale can be suppressed without increasing the height of the input chute.

  In addition, since the cut gates 14L and 14R are selectively opened individually, the objects to be weighed can be quickly sorted and fed into the large throw-in weighing hoppers 11L and 11R. Then, by performing a combination operation in the medium throw-in weighing hoppers 21A to 21G so as to overlap with the sorting throw-in of the objects to be weighed into the large throw-in weighing hoppers 11L and 11R, two weighing processes are performed. It will overlap in time and the time required for the entire weighing process in a plurality of times can be further shortened.

  In addition, by providing the middle throw-in weighing unit 20 having the above-described configuration, after weighing most of the target weight using the large throw-in weighing hoppers 11L and 11R, a plurality of weight ratios are set so that the weight ratio becomes seven or more. The combination calculation is performed based on the objects to be weighed respectively put into the middle throwing weighing hoppers 21A to 21G. Thus, by performing the combination calculation from seven or more weight ratios, the error from the target weight can be reduced without separately performing loss-in weighing. Therefore, it is possible to increase the measurement speed while maintaining high measurement accuracy.

  Furthermore, in the above configuration, each of the plurality of medium throw-in weighing hoppers 21 </ b> A to 21 </ b> G is configured by seven weighing hoppers having one load cell 23. The weighing hoppers 21A to 21G can be loaded at the same timing, and the weighing speed can be further increased.

  In addition, in this embodiment, although the structure provided with seven middle throwing weighing hoppers 21A-21G was demonstrated, the aspect of this invention is not restricted to this. For example, eight or more medium throw-in weighing hoppers may be provided. Moreover, the arrangement | positioning aspect of each middle throwing weighing hopper is not restricted to the aspect of the said embodiment, Various arrangement | positioning can be carried out suitably. Further, various weight ratios of seven or more types realized by seven or more medium throw-in weighing hoppers are also suitably set. As long as there are seven or more types of weight ratios, a plurality of medium-throw weighing hoppers may have medium-throw weighing hoppers set to the same weight ratio.

  Moreover, in this embodiment, in order to throw in the objects to be weighed with different weights into the medium throw-in weighing hoppers 21A to 21G, the time when the cut gates 22Ab to 22Gb are opened is made different from each other. It is not limited to this. For example, the opening times of the cut gates 22Ab to 22Gb may be the same, and the opening degrees of the cut gates 22Ab to 22Gb may be different from each other.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The difference between the packer scale 102 of the present embodiment and the first embodiment is that, in the middle throw-in weighing unit 25, each of the plurality of middle throw-in weighing hoppers 24 </ b> A to 24 </ b> D has one load cell 23 and a hollow communication portion. That is, it is composed of four weighing hoppers having holding parts 24Aa to 24Da and 24Ab to 24Db for the objects to be weighed, which are divided into two sections by the partition plates 24Ac to 24Dc, respectively.

  In the present embodiment, two of the four medium throw-in weighing hoppers 24A to 24D are arranged in a line in the front-rear direction on the left side of the large throw-in weighing unit 10 as shown in FIG. Are arranged in a line in the front-rear direction on the right side of the large throw-in weighing unit 10. In this way, the placement area of the packer scale 102 can be reduced by efficiently arranging the medium throw-in weighing hoppers 24 </ b> A to 24 </ b> D in a line in the front-rear direction on the left and right sides on the side of the large throw-in weighing unit 10. Can do.

  Moreover, each holding | maintenance part 24Aa-24Da, 24Ab-24Db is equipped with discharge gate 24Ad-24Dd, 24Ae-24De which hold | maintains the to-be-measured object in the said holding | maintenance part 24Aa-24Da, 24Ab-24Db temporarily, and discharge | releases below. Yes. The discharge gates 24Ad to 24Dd and 24Ae to 24De, which are provided in each of the one middle input weighing hoppers 24A to 24D, are configured to be openable and closable independently of each other. The discharge gates 24Ad to 24Dd are configured to be rotatable about the rotation shafts 24Af to 24Df, and the discharge gates 24Ae to 24De are configured to be rotatable about the rotation shafts 24Ag to 24Dg. The discharge gates 24Ad to 24Dd corresponding to the one holding portion 24Aa to 24Da and the discharge gates 24Ae to 24De corresponding to the other holding portion 24Aa to 24Da are respectively driven by separate rotary actuators (not shown). As a result, the two holding portions 24Aa to 24Da and 24Ab to 24Db provided in the same medium throw-in weighing hoppers 24A to 24D can be driven independently.

  The eight holding portions 24Aa to 24Da and 24Ab to 24Db constituted by these four medium throw-in weighing hoppers 24A to 24D are configured such that the ratios of the adjusted weights (target throwing weights) are different from each other. . As a result, the middle input weighing unit 25 in the present embodiment has eight types of weight ratios (target values) adjusted by the combination calculation.

  Also in the middle charging weighing hoppers 24A to 24D in the present embodiment, the target charging weights to the holding portions 24Aa to 24Da and 24Ab to 24Db are 5 g, 10 g, 20 g, 40 g, 80 g, 160 g, 320 g, and 640 g in ascending order. Configured. In this way, the objects to be weighed (targeted for combination calculation) are made different by changing the target throwing weights of the eight holding portions 24Aa to 24Da and 24Ab to 24Db of the four medium throwing weighing hoppers 24A to 24D. The ratio of the target input weight is 1: 2: 4: 8: 16: 32: 64: 128.

  In the present embodiment, the total of the target input weights that are input to the two holding portions 24Aa to 24Da and 24Ab to 24Db of the one intermediate input weighing hoppers 24A to 24D does not differ as much as possible depending on the intermediate input weighing hoppers 24A to 24D. In addition, the holding unit with the smaller target input weight is set to be combined with the holding unit with the larger target input weight. For example, the target charging weight of the holding portion 24Aa of the intermediate charging weighing hopper 24A is 5 g, the target charging weight of the holding portion 24Ab is 640 g, the target charging weight of the holding portion 24Ba of the intermediate charging weighing hopper 24B is 10 g, and the holding portion 24Bb The target charging weight is 320 g, the target charging weight of the holding portion 24Ca of the medium charging weighing hopper 24C is 20 g, the target charging weight of the holding portion 24Cb is 160 g, and the target charging weight of the holding portion 24Da of the medium charging weighing hopper 24D is The target input weight of the holding unit 24Db is 80 g at 40 g. As a result, the size of the intermediate charging weighing hoppers 24A to 24D and the loadable weight of the load cell 23 can be reduced as much as possible, and the entire weighing device can be reduced in size.

  Further, the medium throw-in weighing unit 25 includes relay units 26L and 26R that supply an object to be weighed put into the throw chute 12 of the large throw-in weighing unit 10 to the medium throw-in weighing hoppers 24A to 24D. Each of the relay portions 26L and 26R has a hollow relay portion main body 26La branched such that the upstream side communicates with the side of the charging chute 12 and the downstream side is positioned above the medium charging weighing hoppers 24A to 24D. , 26Ra. On the downstream side of the relay section main bodies 26La and 26Ra, communication sections 26Ae to 26De are provided corresponding to the intermediate input weighing hoppers 24A to 24D so that the objects to be weighed pass in the vertical direction. Each of the communication portions 26Ae to 26De has a discharge port at a position corresponding to each of the insertion ports of the holding portions 24Aa to 24Da and 24Ab to 24Db of the medium charging weighing hoppers 24A to 24D. Specifically, at the downstream end of the communication portions 26Ae to 26De, the partition plates 26Ad, which are provided so as to be substantially flush with the partition plates 24Ac to 24Dc of the medium throw-in weighing hoppers 24A to 24D when viewed from above. 26Dd is provided.

  Moreover, the relay parts 26L and 26R have cut gates 26Ab to 26Db provided at the respective discharge ports. The cut gates 26Ab to 26Db are configured to be rotatable around the rotation shafts 26Ac to 26Dc, respectively. When the cut gates 26Ab to 26Db are rotated about the rotation shafts 26Ac to 26Dc, the cut gate 26Ab corresponding to any one of the pair of holding portions 24Aa to 24Da and 24Ab to 24Db of the intermediate charging hoppers 24A to 24D. Opening the discharge port area of ˜26Db and putting the object to be weighed into any one of the holding portions 24Aa to 24Da and 24Ab to 24Db, and putting the object to be weighed into the intermediate charging hoppers 24A to 24D The closed state to be restricted is switched.

  In the present embodiment, the area of each discharge port corresponding to each holding portion 24Aa to 24Da and 24Ab to 24Db of the intermediate charging weighing hoppers 24A to 24D, which is provided on the downstream side of the relay portion main bodies 26La and 26Ra, is adjusted by a combination calculation. The discharge port inserted into the holding part having a large weight ratio (target value) has a larger area. Thereby, the time for opening the cut gates 26Ab to 26Db (gate opening time) can be made close to each other regardless of the input amount (target value) of the objects to be weighed into the holding portions 24Aa to 24Da and 24Ab to 24Db. . In addition, the area of the discharge port provided in relay part main body 26La and 26Ra does not necessarily need to be the same opening time in cut gates 26Ab to 26Db corresponding to all holding parts 24Aa to 24Da and 24Ab to 24Db. That is, it is cut so that the weights of the objects to be weighed in the holding portions 24Aa to 24Da and 24Ab to 24Db become the preset weights until the weighing of the large throw-in weighing hoppers 11L and 11R is completed. The opening time of the gates 26Ab to 26Db and the area of the discharge port may be determined. It is good also as making only the opening time of cut gate 26Ab-26Db differ by making all the area of a discharge port the same.

  In addition, in order to make the stabilization period of the intermediate input weighing hoppers 24A to 24D as long as possible in order to stably perform the measurement in the intermediate input weighing hoppers 24A to 24D without increasing the measuring time of the entire packer scale, The shorter the charging time of the objects to be weighed into the weighing hoppers 24A to 24D, the better. Therefore, it is preferable to shorten the opening / closing time of the cut gates 26Ab to 26Db. However, if the closing speed of the cut gates 26Ab to 26Db is increased too much, noise may be generated or equipment may be damaged. For this reason, when closing the cut gates 26Ab to 26Db, it is preferable to make the speed immediately before closing slower than before that. Therefore, the cut gates 24A to 24D are configured such that the speed from the predetermined position from the open state to the closed state until reaching the closed state is slower than the speed from the open state to reaching the predetermined position. It is preferable. Furthermore, the cut gates 24A to 24D preferably have a speed when moving from the closed state to the open state to be equal to or higher than a speed required to reach a predetermined position from the closed state.

  In the medium throw-in weighing unit 25 having such a configuration, the objects to be weighed are respectively provided to the holding portions 24Aa to 24Da and 24Ab to 24Db of the medium throw-in weighing hoppers 24A to 24D from the throw chute 12 through the relay units 26L and 26R. Is inserted. For example, taking the middle throw-in weighing hopper 24D shown in FIG. 7 as an example, with the holding parts 24Da and 24Db both empty, first, an object to be weighed is placed on one of the holding parts 24Da and 24Db (here, 24Da). throw into. At this time, the cut gate 26Db in the closed state rotates in the direction around the holding shaft 24Db around the rotation shaft 26Dc, and the holding portion 24Db corresponding to the holding portion 24Db is held in the closed state with the insertion port of the relay portion main body 26Ra being closed. By opening the insertion port of the relay unit main body 26Ra corresponding to the part 24Da, a predetermined amount (target value) of an object to be weighed is introduced only into the holding part 24Da.

  Since the weight of the middle throw-in weighing hopper 24D itself is known, it is thrown into the holding portion 24Da by subtracting the weight of the middle throw-in weighing hopper 24D from the weight measured by the load cell 23 supporting the middle throw-in weighing hopper 24D. The weight of the object to be weighed is measured.

  Thereafter, the cut gate 25Da rotates around the rotation shaft 26Dc in the direction of the holding unit 24Da, and only the insertion port of the relay unit main body 26Ra corresponding to the other of the holding units 24Da and 24Db (here, 24Db) is opened for a predetermined time. By setting the state, a predetermined amount of the object to be weighed is also introduced into the holding portion 24Db.

  Since the weights of the objects to be weighed put into the intermediate charging weighing hopper 24D and the holding unit 24Da are known, the weight of the medium charging weighing hopper 24d and the weight charged into the holding unit 24Da from the weight weighed by the load cell 23. By subtracting the weight of the weighing object, the weight of the weighing object put into the holding unit 24Db is measured.

  The weights of the objects to be weighed in all the holding parts 24Aa to 24Da and 24Ab to 24Db are measured, and these values are sent to a control device (not shown). The control device performs combination calculation using the weights of the eight kinds of objects to be weighed based on the predetermined ratio. Then, the discharge gates 24Ad to 24Dd and 24Ae to 24De of the holding portions 24Aa to 24Da and 24Ab to 24Db corresponding to the weight selected for the combination calculation are opened, and the objects to be weighed having the weight selected for the combination calculation are discharged. .

  The holding objects 24Aa to 24Da and 24Ab to 24Db from which the objects to be weighed are discharged are newly loaded with the objects to be weighed, and the weights of the objects to be weighed are measured. A combination operation is performed using the weight.

  Also in the above-described configuration, since a plurality of large throw-in weighing hoppers 11L and 11R are provided, the timing of charging, weighing and discharging the objects to be weighed can be shifted for each large throw-in weighing hopper 11L and 11R. Thereby, in the weighing stabilization period in one large throw-in weighing hopper (one of 11L and 11R), an object to be weighed or discharged in another large throw-in weighing hopper (the other of 11L and 11R) Therefore, the overall weighing speed in the plurality of large throw-in weighing hoppers 11L and 11R can be increased.

  In addition, by providing the medium throw-in weighing unit 25 having the above-described configuration, after weighing most of the target weights using the large throw-in weighing hoppers 11L and 11R, a plurality of weight ratios are obtained so that the weight ratio becomes seven or more. The combination calculation is performed based on the objects to be weighed respectively inserted into the holding portions 24Aa to 24Da and 24Ab to 24Db of the medium charging weighing hoppers 24A to 24D. Thus, by performing the combination calculation from seven or more weight ratios, the error from the target weight can be reduced without separately performing loss-in weighing. Therefore, it is possible to increase the measurement speed while maintaining high measurement accuracy. In addition, in the present embodiment, the medium input weighing hopper for weighing the objects to be weighed having seven or more kinds of weight ratios can be configured by the four weighing hoppers 24A to 24D, which are substantially half, so that the measuring device is enlarged. Can be suppressed.

  Further, the object to be weighed supplied from the charging chute 12 is passed through the communication portions 26Ae to 26De formed for the respective medium charging weighing hoppers 24A to 24D, and the cut gates 26Ab to 26Db are provided below the communication portions 26Ae to 26De. It is used to sort and put into the holding portions 24Aa to 24Da and 24Ab to 24Db of the respective intermediate charging weighing hoppers 24A to 24D. Thereby, the objects to be weighed can be thrown into the holding portions 24Aa to 24Da and 24Ab to 24Db of the middle throwing weighing hoppers 24A to 24D having a simple structure and divided into two easily and reliably.

  In addition, in this embodiment, although the structure provided with four middle throwing weighing hoppers 24A-24D each having two holding | maintenance part 24Aa-24Da, 24Ab-24Db was demonstrated, the aspect of this invention is not restricted to this. . For example, five or more medium throw-in weighing hoppers each having two holding portions may be provided. Moreover, the arrangement | positioning aspect of each middle throwing weighing hopper is not restricted to the aspect of the said embodiment, Various arrangement | positioning can be carried out suitably. In addition, various weight ratios of seven or more types realized by four or more medium throw-in weighing hoppers each having two holding portions are also suitably set. As long as there are seven or more types of weight ratios, in the plurality of holding parts, the holding parts that are set to the same weight ratio (whether the holding parts that are set to the same weight ratio exist in the same medium input weighing hopper It may be present (whether present in a separate middle input weighing hopper).

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The difference between the packer scale 104 of the present embodiment and the first embodiment is that there is only one large throw-in weighing hopper 41 constituting the large throw-in weighing unit 40.

  Correspondingly, the large throw-in weighing unit 40 includes a throw chute 42 for feeding an object to be weighed to the large throw-in weighing hopper 41. The input chute 42 includes a hollow communication portion 43 through which an object to be weighed passes in the vertical direction, and cut gates 44L and 44R for switching whether or not the object to be weighed into the large input weighing hopper 41 can be inserted below the communication portion 43. ing. In the present embodiment, the cut gates 44L and 44R are configured to be rotatable around the rotation shafts 44La and 44Ra, respectively. When the cut gates 44L and 44R rotate about the rotation shafts 44La and 44Ra, an open state in which an object to be weighed is input to the large input weighing hopper 41 corresponding to each of the cut gates 44L and 44R, and the large input weighing hopper 41 The closed state that restricts the input of the object to be weighed into the switch is switched. The cut gates 44L and 44R are configured to be opened (become open) at the same time. Note that the rotation axes of the cut gates 44L and 44R may be configured coaxially.

  The large input weighing hopper 41 includes a communication part 41b through which an object to be weighed through the upper input port 41a flows, and a discharge gate 41c for temporarily holding the object to be measured in the communication part 41b and discharging it downward. ing.

  Also in the above configuration, after weighing most of the target weight using the large throw-in weighing hopper 41, the objects to be weighed respectively loaded into the multiple medium throw-in weighing hoppers 21A to 21G so as to have a weight ratio of seven or more types. Based on this, a combination operation is performed. Thus, by performing the combination calculation from seven or more weight ratios, the error from the target weight can be reduced without separately performing loss-in weighing. Therefore, it is possible to increase the measurement speed while maintaining high measurement accuracy.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various improvements, changes, and modifications can be made without departing from the spirit of the present invention. For example, the components in the plurality of embodiments may be arbitrarily combined. For example, the large input weighing unit 40 of the third embodiment may be combined with the middle input weighing unit 25 of the second embodiment. In the above embodiment, the description has been made based on the large throw-in weighing unit including one or two large throw-in weighing hoppers. However, three or more large throw-in weighing hoppers may be provided.

  Moreover, in the said embodiment, the aspect which controls the quantity of the to-be-measured object thrown into each middle throwing weighing hopper 21A-21G in the middle throwing weighing part 20 by the gate open time of corresponding cut gate 22Ab-22Gb was demonstrated. However, it is not limited to this. For example, as an aspect of controlling the input of the objects to be weighed into each of the intermediate input weighing hoppers 21A to 21G, an aspect of controlling by weighing the weight of the intermediate input weighing hoppers 21A to 21G while introducing the objects to be weighed may be adopted. Good. For example, while the cut gates 22Ab to 22Gb are opened, the weight of the objects to be weighed in the intermediate input weighing hoppers 21A to 21G is measured at predetermined time intervals, and the target measured weight is reached from a plurality of measured values obtained thereby. Predict the time to do. For example, by performing a smoothing process such as a moving average on a plurality of measurement values, the ratio of the change in the measurement weight over time is obtained, and the time to reach the target measurement weight is calculated from the ratio. The closing control of the cut gates 22Ab to 22Gb is performed based on the time to reach the target weighing weight thus predicted. Even in such a case, the objects to be weighed finally put into the medium throw-in weighing hoppers 21A to 21G are weighed after the stabilization period has elapsed.

  As in the above-described embodiment, when controlling the input of the objects to be weighed into the intermediate input weighing hoppers 21A to 21G only by the gate opening time, the change in the specific gravity of the objects to be weighed due to the change of the type of the objects to be weighed or the external The weight of the object to be weighed may be relatively large due to the impact of the impact. On the other hand, by controlling the input of the object to be weighed based on the weight of the object being weighed, it is possible to suppress variations in the input weight of the object to be weighed and to achieve high accuracy without reducing the processing speed of the entire weighing device. Weighing can be performed.

  Moreover, it is good also as performing the injection control of the to-be-measured object based on the weight of the to-be-measured object in the above with respect to the large throw-in weighing hopper 11L, 11R, or 41. FIG.

  The weighing device of the present invention is useful for increasing the weighing speed while maintaining high weighing accuracy.

11L, 11R, 41 Large input weighing hoppers 21A to 21G Medium input weighing hopper 12 Input chute 13 Communication portion 14L, 14R Cut gate 13a Partition plate

Claims (8)

A large input weighing hopper for weighing the object to be weighed and supplying the object to be weighed after being weighed by supplying an object to be weighed less than the target weight;
By supplying the objects to be weighed with the weights adjusted at different ratios, a combination operation based on the weight of the objects to be weighed is performed, and the objects to be weighed are discharged based on the result of the combination operation. A plurality of medium throw-in weighing hoppers,
The target input weight of the medium input weighing hopper having the smallest adjusted weight ratio among the plurality of medium input weighing hoppers is an allowable error between the weight of the object to be weighed discharged by the entire weighing device and the target weight. Set to the following weights,
In the plurality of middle input weighing hoppers, the total value of the target weighing weights of the plurality of middle input weighing hoppers is the maximum value of the target weight value of the combination calculation by the plurality of middle input weighing hoppers and the large input weighing hopper. A weighing device composed of the minimum number that is equal to or greater than the total value with the upper limit of the allowable weighing error. A large input weighing hopper for weighing the object to be weighed and supplying the object to be weighed after being weighed by supplying an object to be weighed less than the target weight;
By supplying the objects to be weighed with the weights adjusted at different ratios, a combination operation based on the weight of the objects to be weighed is performed, and the objects to be weighed are discharged based on the result of the combination operation. A plurality of medium throw-in weighing hoppers,
The target input weight of the medium input weighing hopper having the smallest adjusted weight ratio among the plurality of medium input weighing hoppers is an allowable error between the weight of the object to be weighed discharged by the entire weighing device and the target weight. Set to the following weights,
Each of the plurality of medium throw-in weighing hoppers has a load cell and a holding part of an object to be weighed divided into two sections,
An input chute for supplying an object to be weighed to the large input weighing hopper;
A relay unit configured to be able to supply an object to be weighed from the charging chute to each of the plurality of medium charging weighing hoppers,
The said relay part is a weighing | measuring apparatus provided with the cut gate which distribute | divides input of the to-be-measured object thrown into each division of the said holding | maintenance part. A large input weighing hopper for weighing the object to be weighed and supplying the object to be weighed after being weighed by supplying an object to be weighed less than the target weight;
By supplying the objects to be weighed with the weights adjusted at different ratios, a combination operation based on the weight of the objects to be weighed is performed, and the objects to be weighed are discharged based on the result of the combination operation. A plurality of medium throw-in weighing hoppers,
The target input weight of the medium input weighing hopper having the smallest adjusted weight ratio among the plurality of medium input weighing hoppers is an allowable error between the weight of the object to be weighed discharged by the entire weighing device and the target weight. Set to the following weights,
Each of the plurality of medium throw-in weighing hoppers has a load cell and a holding part of an object to be weighed divided into two sections,
The plurality of middle throw-in weighing hoppers are combined with the holding unit having a larger target throwing weight as the holding unit having a smaller target throwing weight in a combination of two holding parts divided into two sections in one middle throwing weighing hopper. A weighing device that is set to be   The weighing device according to any one of claims 1 to 3, wherein the plurality of medium throw-in weighing hoppers are configured so that there are seven or more kinds of weight ratios to be adjusted.   The weighing device according to any one of claims 1 to 4, wherein each of the plurality of medium throwing weighing hoppers is set with a target throwing weight so that a ratio of weights to be adjusted becomes a geometric sequence having a common ratio of 2. .   The plurality of medium throw-in weighing hoppers are weighed after the weighing object is put into the large throw-in weighing hopper and before the weight of the weighing object put into the large throw-in weighing hopper is weighed. The weighing device according to any one of claims 1 to 5, wherein the weighing device is configured to be charged with an object. The relay portion includes a hollow communication portion provided corresponding to each of the intermediate charging weighing hoppers so that an object to be weighed passes in the vertical direction.
The area of the discharge port provided corresponding to each of the holding units below the communication unit has a larger area as the discharge port is inserted into the holding unit having a large weight ratio adjusted by the combination calculation. The weighing device according to claim 2 .   The weighing device according to claim 1, comprising a plurality of large throw-in weighing hoppers.

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