JP4783641B2 - Weighing conveyor - Google Patents

Description

  The present invention relates to a weighing conveyor. More specifically, the present invention relates to a conveyor that conveys an object to be weighed from the carry-in end to the carry-out end, and a weighing conveyor provided with a weighing device for weighing the object to be weighed on the conveyor.

A weighing conveyor including a conveyor that transports an object to be weighed from a carry-in end to an unloading end and a weighing device that measures the weight of the object to be weighed on the conveyor is generally on the conveyor of the object to be weighed. During weighing, the weighing device reads the weighing signal at regular intervals, and removes the influence of vibration or the like based on the read plurality of weighing signals to obtain a highly accurate weighing value. Therefore, since it takes a certain time to weigh the object to be weighed, there is a correlation between the conveyor speed of the weighing conveyor and the weighing accuracy. (For example, see Patent Document 1 [0006] to [0007], Patent Document 2 [0009] to [0014])
In particular, the weighing accuracy is affected by vibrations caused by a conveyor driving motor or the like, impacts when the objects to be weighed are placed on the conveyor, and the like. Therefore, in order to eliminate these effects, in the conventional weighing conveyor, weighing is performed after a stable time has elapsed after the object to be weighed is placed on the conveyor, or the weighing signal is processed by an electric filter (for example, Patent Document 1 [0004] to [0005] and Patent Document 2 [0010]).

By the way, in the practical use of the weighing conveyor, the conveyor speed and the stabilization time are set so as to match the conveyance speed of the conveyance line in which the weighing conveyor is incorporated and to obtain higher weighing accuracy. On the other hand, the object to be weighed slides on the conveyor, or the object to be weighed slips with the conveyor when it enters the conveyor. Therefore, at the time of installing the weighing conveyor, in order to achieve more accurate weighing, the weighing work of the object to be weighed is performed, and the adjustment work to adjust the stabilization time after the boarding of the object to be weighed on the conveyor, the conveyor speed, etc. Is going.
JP 7-218325 A JP 2002-13971 A

  However, in the conventional adjustment work such as the stabilization time and the conveyor speed, the consistency with the conveyance speed of the conveyance line in which the weighing conveyor is incorporated, the conveyor of the objects to be weighed during conveyance on the conveyor and when entering the conveyor, It was difficult to discriminate the degree of sliding between the two, and the adjustment work at the time of installing the weighing conveyor was a work requiring skill.

  In addition, during operation after installation, due to some factors, the degree of slippage between the object to be weighed during transportation on the conveyor and when entering the conveyor fluctuates, and the flow and transportation of the object to be weighed Deviations from the line conveyance speed and deviations in the flow of the object to be weighed from the weighing may occur. However, it is difficult to discriminate these deviations visually, and it is difficult to detect a decrease in measurement accuracy during operation.

  Further, Patent Documents 1 and 2 do not disclose or suggest any means for solving the above problems.

  The present invention has been made in order to solve the above-described problems, and facilitates the adjustment work at the time of installing the weighing conveyor, and allows the flow of the objects to be weighed and the conveyance speed to be adjusted even during operation of the weighing conveyor. It is an object of the present invention to provide a weighing conveyor that can easily check the deviation and the deviation between the flow of the object to be weighed and the weighing operation.

In order to solve the above problems, the weighing conveyor according to the first aspect of the present invention includes a conveyor for conveying an object to be weighed from a loading end to an unloading end, and a weighing for weighing the object to be weighed on the conveyor. A weighing conveyor equipped with a device, a detection device that detects the passage of an object to be weighed near the carry-in end, a display device that can display a weighing section of the weighing conveyor at a predetermined time, and detection of the detection device A control device that controls the weighing device and the display device based on a signal and a preset conveyance speed, and synchronizes the start and end of the weighing and the display of the display device, and the display device. The display unit displays the measurement section so that the display section moves in the measurement section or an area parallel to the measurement section at the transport speed.
A weighing conveyor according to a second aspect of the present invention is a weighing conveyor provided with a conveyor for conveying an object to be weighed from a loading end to an unloading end, and a weighing device for weighing the object to be weighed on the conveyor. A detection device for detecting the passage of the object to be measured near the carry-in end, a display device capable of displaying the measurement section of the weighing conveyor at a predetermined time, a detection signal of the detection device, and a preset value. A control device for controlling the weighing device and the display device based on a conveying speed to synchronize the start and end of the weighing and the display of the display device, the display device on the conveyor The measurement section is displayed by irradiating light to a predetermined section or an area parallel to the measurement section.
A weighing conveyor according to a third aspect of the present invention is a weighing conveyor provided with a conveyor for conveying an object to be weighed from a loading end to an unloading end, and a weighing device for weighing the object to be weighed on the conveyor. A detection device for detecting the passage of the object to be measured near the carry-in end, a display device capable of displaying the measurement section of the weighing conveyor at a predetermined time, a detection signal of the detection device, and a preset value. A control device that controls the weighing device and the display device based on a conveyance speed to synchronize the start and end of the weighing and the display of the display device, and the display device starts the weighing Sometimes the upstream end in the transport direction of the weighing section is displayed, and the downstream end in the transport direction of the weighing section is displayed at the end of the weighing.
When configured as described above , synchronization between the flow of the object to be weighed and the conveying speed and synchronization between the flow of the object to be weighed P and the weighing operation can be easily performed by synchronizing the flow of the object to be weighed and the display on the display device. Since it can discriminate | determine, the adjustment operation | work at the time of installation of a measurement conveyor can be made easy. Further, even when the weighing conveyor is in operation, it is possible to easily check the deviation between the flow of the object to be weighed and the conveyance speed and the deviation between the flow of the object to be weighed and the weighing operation. Here, the weighing section is an area on the conveyor of the weighing conveyor, which is suitable for the weighing device to measure an object to be weighed, that is, the generated weighing error is small compared to other sections. Refers to a section.

  As described above, the weighing conveyor according to the present invention facilitates the adjustment work at the time of setting the weighing conveyor, the deviation between the flow of the object to be weighed and the conveyance speed and the weighing object even during the operation of the weighing conveyor. There is an effect that the deviation between the flow and the weighing operation can be easily confirmed.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 1 is a side view schematically showing a configuration of a weighing sorting line using a weighing conveyor according to an embodiment of the present invention. FIG. 2 is a plan view schematically showing the configuration of the weighing and sorting line of FIG.

  In FIG. 1, the weighing / sorting line 100 includes a transfer device 10, a weighing conveyor 20, and a sorting device 30. The objects to be weighed P are transported from the transport device 10, transferred and transported in the order of the weighing conveyor 20 and the sorting device 30, and sorted by the sorting device 30 based on the weighing result. .

  Here, the conveying apparatus 10 is configured to sequentially deliver the articles P from the sending end 10A using a conveying conveyor.

  The weighing conveyor 20 includes a conveyer 21 that conveys the object to be weighed P from the carry-in end 21A to the carry-out end 21B, a weighing device 22 that measures the weight of the object P being conveyed on the conveyor 21, and an object P to be weighed. A detection device 23 that detects the passage of the position near the carry-in end 21 </ b> A, a display device 24 that is arranged in parallel with the conveyor 21, and a control device 25.

  Here, in the weighing conveyor 20, the carry-in end 21 </ b> A is disposed close to the carry-out end 10 </ b> A of the transport device 10 so that the object P to be weighed sent from the send-out end 10 </ b> A gets into the conveyor 21.

  The conveyor 21 is configured such that the endless belt is driven by a driving device (not shown) such as a roller and a motor.

  The weighing device 22 is constituted by a load cell and is mounted so as to support the conveyor 21.

  The detection device 23 uses a photoelectric switch disposed in the vicinity of the carry-in end 21 </ b> A so that the light beam traverses the conveyance path of the measurement object P. Here, as shown in FIG. 2, the photoelectric switch includes a pair of light projecting units and light receiving units. Accordingly, by detecting the blockage of the light beam by the object to be weighed P, it is possible to detect the passing of the object to be weighed P at the position of the carry-in end 21A. Can do.

  The detection device 23 is installed in the vicinity of the carry-in end 21 </ b> A so that the detection position is a position where it is possible to reliably estimate the time when the object P is loaded onto the conveyor 21. That is, the detection device 23 is adjusted in position according to the object to be weighed to reliably detect the passage of the object to be weighed P, and the time required for getting on the conveyor 21 after detection is substantially constant. It is installed in such a position. Thereby, since the control apparatus 25 can acquire the measurement start time more accurately, the measurement accuracy can be further improved.

  The display device 24 is arranged to display the weighing section 24A by emitting light in the weighing section 24A, more precisely, the area 24A parallel to the weighing section. Specifically, the display device 24 is configured by a light emitting body such as an LED or a light bulb arranged in a band shape, or a band-shaped electric bulletin board, a liquid crystal panel, or the like. The display device 24 is disposed in parallel with the extending direction of the conveyor 21. More precisely, the display device 24 is disposed in a region parallel to the weighing section 24A at the minimum in the extending direction of the conveyor 21. Here, the weighing section 24A is an area on the conveyor 21 that extends in the extending direction of the conveyor 21, and the weighing device 22 measures the object P, that is, the generated measurement error is relatively different from that of the other sections. This refers to a small section (hereinafter, the measurement section and its parallel area are collectively referred to as a measurement section 24A).

  In the present embodiment, the measurement section 24A is a section connecting the upstream end 21D and the downstream end 21E. Here, as shown in FIGS. 1 and 2, the upstream end 21 </ b> D means that the object to be weighed is in a position where the object to be weighed P starts to ride on the conveyor 21 from the carry-in end 21 </ b> A and the bottom surface is completely mounted on the conveyor 21. The position of the tip of the object P is used. That is, it coincides with the position of the front end of the object to be weighed P in the situation where the rear end of the object to be weighed P is located above the central axis of the roller on the carry-in end 21A side of the conveyor 21. As shown in FIGS. 1 and 2, the downstream end 21 </ b> E is positioned so as to approach the carry-out end 21 </ b> B and the tip of the object P to be separated from the conveyor 21. That is, it coincides with the upper position of the central axis of the roller on the carry-out end 21B side of the conveyor 21.

  The control device 25 includes a control unit 25A configured with a general arithmetic device such as a CPU, and an input unit 25B configured with a general input device such as a touch panel and a keyboard.

The control unit 25A controls the weighing device 22 and the display device 24 on the basis of the detection signal of the detection device 23 and the preset transport speed V _T , and synchronizes the start and end of measurement with the display on the display device 24. It is configured to let you. Further, the conveyor 21 is controlled based on the conveyor speed V _C input from the input unit 25B. In addition, the drive control of the conveyor 21 can also be comprised so that the drive device of the conveyor 21 may perform. Furthermore, it is also possible to configure the control unit 25A to control the distribution operation of the distribution device 30 described later.

  The control device means not only a single control device but also a control device group in which a plurality of control devices cooperate to execute control. Therefore, the control device 25 does not need to be configured by a single control device, and a plurality of control devices are arranged in a distributed manner so that they cooperate to control the operation of the weighing conveyor 20. You can also.

  As shown in FIG. 2, the sorting device 30 is arranged at the carry-out end 21B of the conveyor 21, and sorts the object P sent from the carry-out end 21B to a plurality of sort destinations B1 and B2. Here, a sorting conveyor having a conveyor 32 and a movable arm 31 is used. The movable arm 31 is arranged so as to advance and retreat on the conveyor 32 so that the objects P to be weighed on the conveyor 32 can be paid out to the side of the conveyor 32 (distribution destination B2 in FIGS. 1 and 2).

  Next, the adjustment work at the time of installation of the measurement conveyor 20 of this invention is demonstrated.

The weighing and sorting line is synchronized with the production speed or packaging speed of the weighing object P arranged on the upstream side of the weighing and sorting line 100 in the flow direction of the weighing object P (hereinafter referred to as the upstream side). A transport speed V _{T of} 100 is determined. Alternatively, according to the interval at which the objects to be weighed P are conveyed or the length between the front end and the rear end of the objects to be weighed, the plurality of objects to be weighed P are not mounted on the weighing conveyor 20 and weighed and sorted. transporting speed V _T of the line 100 is determined.

Then, the conveyor speed V _C is input as V _C = V _T from the input unit 25B of the control device 25. Thereby, the conveyor 21 is driven at a predetermined speed.

Further, the upstream end 21D is determined from the size of the measurement object P, and the measurement section 24A is determined. Then, the measuring time T _M is calculated as T _M = L ₁ / V _T from the length of the measuring section 24A, that is, the measuring section length L ₁ and the conveyance speed V _T. Further, the stabilization time T _S is calculated as T _S = L ₂ / V _T from the length between the arrangement position of the detection device 23 and the upstream end 21D, that is, the boarding distance L ₂ and the conveyance speed V _T. Then, the measurement section 24A, the measurement time T _M and the stabilization time T _S are input from the input unit 25B of the control device 25.

In addition, about the input method of the measurement area 24A, it performs according to the setting method of the display apparatus 24 to be used. Alternatively, the weighing section length L ₁ , the boarding distance L ₂ , and the conveyance speed V _T are input from the input unit 25B of the control device 25, and the control unit 25A is operated by the weighing section 24A, the weighing time T _M, and the stabilization time T _S. Can be automatically calculated and set.

Then, the control device 25 controls the display device 24 to cause the measuring section 24A to emit light during the measuring time T _M after a time delay of the stable time T _S from the time when the detecting device 23 detects the object P to be measured. . Further, the control device 25 controls the weighing device 22 to start weighing, that is, reading the weighing signal, after a time delay of the stable time T _S from the time when the detection device 23 detects the object P to be weighed. That is, the control device 25 assumes that the measurement start time is when the stable time T _S has elapsed from the detection time by the detection device 23, and the measurement end time is when the measurement time T _M has elapsed from the measurement start time. And the display device 24 are controlled. Thereby, the start and end of measurement and the display on the display device 24 can be synchronized. In addition, since the reading of the inaccurate measurement value can be prevented by such control in consideration of the stable time T _S , the synchronization of the flow of the object to be measured P and the conveyance speed V _T, and the object to be weighed P The synchronization between the flow and the weighing operation can be made more accurate.

  Here, a weighing test using the object P is performed. In the weighing test, the synchronization between the flow of the object P to be weighed on the weighing conveyor 20 and the display on the display device 24 is visually confirmed as follows.

First, it is confirmed whether there is a deviation between the flow of the object P to be measured and the stabilization time T _S. Specifically, after the object to be weighed P transported from the transfer device 10 starts to transfer to the weighing conveyor 20, the position of the tip of the object to be weighed P and the upstream end 21D of the weighing section 24A when the display device 24 is turned on. The presence or absence of misalignment is confirmed visually.

Next, to confirm the presence or absence of a deviation of the conveying speed V _T and the flow of the objects to be weighed P. Specifically, when the display device 24 is turned off, whether or not there is a deviation between the tip of the object P to be measured and the position of the downstream end 21E of the weighing section 24A is visually confirmed.

  When the display device 24 is turned on, it is possible to confirm the appropriateness of the set position of the upstream end 21D by visually checking whether or not the rear end of the object P is completely on the conveyor 21. it can.

When any of these deviations is confirmed, the flow of the object to be weighed P is adjusted by adjusting the conveyor speed V _C of the weighing conveyor 20, the weighing section 24 A, the weighing time T _M and the stabilization time T _S. And the display of the display device 24 are adjusted so as to be synchronized. For example, when there is a case where a rectangular object P in a plan view is inclined and conveyed in a plan view, the upstream end 21D is further set to the downstream side, the weighing section length L ₁ , the boarding distance L ₂ , weighing time T _M , and stabilization time T _S are corrected and recalculated and adjusted. In addition, when the object to be weighed P slips on the conveyor 21, the flow of the object to be weighed P becomes slower than the transport speed V _T , so the conveyor speed V _C is set faster than the transport speed V _T. The flow of the object P is adjusted so as to be synchronized with the display on the display device 24.

  Next, the above confirmation operation is performed even during operation of the weighing conveyor 20 of the present invention. When a deviation is confirmed in these confirmations, the setting of the weighing conveyor 20 is readjusted. This can improve the decrease in measurement accuracy. In addition, in the readjustment of the setting of the weighing conveyor 20, it is not necessary to stop the weighing conveyor 20. That is, it can be readjusted so that these shifts are eliminated while the weighing conveyor is operating.

As described above, the weighing conveyor 20 according to the present invention synchronizes the flow of the object to be weighed P with the transport speed _VT and synchronizes the flow of the object to be weighed P with the weighing operation with the flow of the object to be weighed P. Since it can be easily determined by synchronization with the display of the display device 24, the adjustment work at the time of installation of the weighing conveyor 20 can be facilitated. In addition, since the synchronization or deviation between the flow of the object to be weighed P and the display on the display device 24 can be easily confirmed even during the operation of the weighing conveyor 20, it is possible to accurately predict a decrease in weighing accuracy.

  The above-described embodiment is an example, and various modifications can be made without departing from the spirit of the present invention, and the present invention is not limited to the above-described embodiment. For example, the display device 24 may be configured to display the weighing section 24A of the conveyor 21 at a predetermined time. Examples 1 to 3 of the weighing conveyor 20 of the present invention will be described as examples.

[Modification 1]
FIG. 3 is a side view schematically showing a configuration of a weighing / sorting line using the weighing conveyor of the first modification.

As shown in FIG. 3, in the first modification, the display method of the display device 24 of the weighing conveyor 20 is modified. That is, the control device 25 lights (displays) only a part of the lighting section (display section) 24B of the weighing section 24A, and the time of the stable time T _S from the time when the detection device 23 detects the measurement object P. After the delay, the lighting unit 24B starts to be lit from the upstream end 21D, and the lighting unit 24B is lit so as to move in the measurement section 24A to the downstream end 21E over a measurement time T _M at a constant speed. Thus, since the lighting unit 24B emits light as run in parallel with the weighed articles P on the conveyor 21, the user of the measuring conveyor 20, the synchronization with the conveyance speed V _T and the flow of the objects to be weighed P, and Synchronization between the flow of the object to be weighed P and the weighing operation can be more easily determined.

[Modification 2]
FIG. 4 is a plan view schematically showing the configuration of a weighing / sorting line using the weighing conveyor of the second modification.

As shown in FIG. 4, in the modification 2, the display device 24 of the weighing conveyor 20 is changed. In other words, the display device 24 is configured to display the measurement section 24 </ b> A by irradiating the measurement section 24 </ b> A with light instead of the belt-like light emitter. Specifically, the display device 24 is configured by an irradiation device that irradiates the belt 21 with belt-shaped light. Then, the control device 25 controls the display device 24, and after the time delay of the stabilization time T _S from the time when the detection device 23 detects the measurement object P, the control device 25 applies the band-shaped light to the measurement section 24A for the measurement time T _M. Irradiate during The measurement section 24A is adjusted by adjusting the irradiation range or irradiation angle of the display device 24. Thereby, the installation space of the display device 24 can be reduced. Further, since it is possible to so as to overlap the object to be weighed P on the conveyor 21 displays the metering section 24A, the user of the weighing conveyor in synchronization with the conveying speed V _T and the flow of the objects to be weighed P, and weighing It is possible to more easily determine the synchronization between the flow of the object P and the weighing operation.

  Further, a spotlight in which the display device 24 irradiates light only at one place and a driving device that can move the irradiation position of the spotlight along the transport direction of the weighing conveyor 20 can also be used. Accordingly, similarly to the first modification, the irradiated portion (display unit) can be turned on so as to move in the measurement section 24A. For example, when the control device 25 controls the drive device of the display device 24, the irradiated portion can be turned on so as to move in the weighing section 24A.

[Modification 3]
FIG. 5 is a plan view schematically showing a configuration of a weighing / sorting line using the weighing conveyor of the third modification.

As shown in FIG. 5, in the third modification, the conveyor 21 of the weighing conveyor 20 is configured by a plurality of endless belts 21A arranged in parallel, and the display device 24 is provided below at least one gap between the endless belts 21A. Is arranged. Accordingly, the display device 24 can be accommodated in the weighing conveyor 20, so that the installation space for the display device 24 can be omitted. Further, since the objects to be weighed P on the conveyor 21 can be displayed a metering section 24A so as to illuminate from below, a user of the weighing conveyor in synchronization with the conveying speed V _T and the flow of the objects to be weighed P, and It is possible to more easily determine the synchronization between the flow of the object P and the weighing.

  Although not shown, the display device 24 can also be configured to display the weighing section 24A by displaying a display tool in the weighing section 24A or a section parallel to the weighing section 24A. For example, methods such as the appearance of a board and the alignment of flags and poles are suitable.

Furthermore, the display device 24 can be configured to display only the upstream end 21D and the downstream end 21E by a method such as light emission, light projection, or posting. Then, the control device 25 controls the display device 24 to display the upstream end 21D at the start of measurement, that is, after the time delay of the stabilization time T _S from the time when the detection device 23 detects the object P. The downstream end 21E may be displayed at the end of measurement, that is, when the measurement time T _{M has} elapsed after the start of display. Thereby, the display device 24 displays only both ends of the weighing section 24A, so that the display device 24 can be made compact.

  The weighing conveyor according to the present invention facilitates the adjustment work at the time of installation of the weighing conveyor, the deviation between the flow of the object to be weighed and the conveying speed, and the flow of the object to be weighed and the weighing operation even during the operation of the weighing conveyor. This is useful as a weighing conveyor that can easily check the deviation.

It is a side view which shows roughly the structure of the measurement selection line using the measurement conveyor of embodiment of this invention. It is a top view which shows roughly the structure of the measurement selection line of FIG. It is a top view which shows roughly the structure of the measurement selection line using the measurement conveyor of the modification 1. It is a side view which shows roughly the structure of the measurement selection line using the measurement conveyor of the modification 1. It is a top view which shows roughly the structure of the measurement selection line using the measurement conveyor of the modification 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Conveying device 10A Sending end 20 Weighing conveyor 21 Conveyor 21A Loading end 21B Unloading end 21D Upstream end 21E Downstream end 22 Weighing device 23 Detection device 24 Display device 24A Weighing section 24B Lighting unit 25 Control device 25A Control unit 25B Input unit 30 Sorting device 31 Conveyor 32 Movable arm 100 Weighing and sorting line B1, B2 Sorting destination L ₁ Measuring section length L ₂ Boarding distance P Weighed object V _C Conveyor speed V _T Conveying speed

Claims (3)

A weighing conveyor comprising a conveyor for conveying an object to be weighed from a carry-in end to an unloading end, and a weighing device for weighing the object to be weighed on the conveyor,
A detection device for detecting the passage of the object to be weighed near the carry-in end; and
A display device capable of displaying the weighing section of the weighing conveyor at a predetermined time;
A control device that controls the weighing device and the display device based on a detection signal of the detection device and a preset conveyance speed, and synchronizes the start and end of the measurement and the display of the display device; Prepared ,
The display device is a weighing conveyor that displays the weighing section so that the display unit moves in the weighing section or a region parallel to the weighing section at the transport speed. A weighing conveyor comprising a conveyor for conveying an object to be weighed from a carry-in end to an unloading end, and a weighing device for weighing the object to be weighed on the conveyor,
A detection device for detecting the passage of the object to be weighed near the carry-in end; and
A display device capable of displaying the weighing section of the weighing conveyor at a predetermined time;
A control device that controls the weighing device and the display device based on a detection signal of the detection device and a preset conveyance speed, and synchronizes the start and end of the measurement and the display of the display device; Prepared,
The display device displays the metering section by irradiating light in a region parallel to the predetermined section or the metering section on the conveyor, weighing conveyor. A weighing conveyor comprising a conveyor for conveying an object to be weighed from a carry-in end to an unloading end, and a weighing device for weighing the object to be weighed on the conveyor,
A detection device for detecting the passage of the object to be weighed near the carry-in end; and
A display device capable of displaying the weighing section of the weighing conveyor at a predetermined time;
A control device that controls the weighing device and the display device based on a detection signal of the detection device and a preset conveyance speed, and synchronizes the start and end of the measurement and the display of the display device; Prepared,
The display device, the display of the conveyance direction upstream end of the metering section at the start of metering, and displays a conveying direction downstream end of the metering zone at the end of the metering, weighing conveyor.

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