JP5070007B2 - Production system - Google Patents

Description

  The present invention relates to a production system capable of diagnosing a failure of a combination weigher using a measurement value of the combination weigher, and more particularly, in a production line in which an inspection device such as a combination weigher, a packaging machine, and a foreign object detection device is arranged. The present invention relates to a failure diagnosis technique for a combination weigher that is executed when the combination weigher receives a product defect detection signal from the product.

  In a conventional production system having a combination weigher for obtaining an optimum amount of articles to be weighed, a packaging machine capable of packaging (for example, bagging and packaging) a combination article composed of a plurality of articles to be weighed discharged from the combination weigher, and packaging A detection device that can detect an abnormality (such as a defective product) of a product and a sorting device that can remove a defective product from the production line are already incorporated.

  Examples of the above-described detection device include a foreign matter detection device such as an X-ray foreign matter detection device and a weight sorter capable of performing a weight check. For example, when a foreign object in a package is detected by the foreign object detection device, or when the package product is out of a predetermined weight range by a weight sorter, these devices detect a defect signal of the combination article of the detection device. It is transmitted to the sorting device installed in the latter stage (post process of the production line). Then, defective products are appropriately excluded from the production line using this distribution device.

  In Patent Document 1, when a sorting device installed at a subsequent stage of a foreign object detection device (here, a metal detection device) receives a metal detection signal from the metal detection device, the sorting device causes the package to contain metal. It is described that distribution can be eliminated. In the technique described in Patent Document 1, the form of a packaged product including foreign matter (metal) sent out from the packaging machine is different from the form of a packaged product not containing foreign matter (metal) according to the metal detection signal of the metal detection device. So that the packaging operation of the packaging machine is controlled. This facilitates the removal of the packaged product containing foreign matter (metal).

  In addition, it is thought that foreign materials, such as a metal, a stone, and a synthetic resin, mix in such a package item for various causes. For example, in a combination weigher, there may be a case where a piece of hopper is mixed into a packaged product due to damage due to wear of the hopper that stores an item to be weighed. As a portion where the hopper is likely to be worn, there is a bearing portion of a swing center portion of a gate that is swingably attached to an opening below the hopper body.

Therefore, in the technique described in Patent Document 2, the bearing portion is improved so that the bush of the bearing portion is not damaged and is not mixed into the packaged product as a foreign matter.
JP-A-63-148130 JP-A-8-135669

  In order to improve the yield and efficiency of the combination weigher described above, it is necessary to reduce the number of defective packages as much as possible. Therefore, the inventor of the present invention enters into a fault diagnosis operation of the combination weigher based on a detection signal in a detection device (for example, a foreign material detection device) that can determine whether the packaged product is good or bad (for example, foreign matter contamination). We believe that we can improve the yield and efficiency of the balance.

  For example, a combination weigher is equipped with a number of gated hoppers so that an optimum combination of articles to be weighed can be performed. Since the frequency of the gate opening / closing drive of the hopper of this combination weigher is high, if the hopper is used for a long period of time, the drive device for driving the hopper gate and the member connecting the gate will be disassembled and disassembled. It is considered that the parts of the hopper thus mixed are mixed into the package as foreign matters. In this case, the packaged product can be shipped for the first time by checking all the packaged products and collecting all the disassembled hopper parts. The longer the period until it can be detected that the hopper is disassembled, the more time and labor it takes to collect the disassembled hopper parts (that is, it is difficult to quickly return the combination weigher). Therefore, it is important to determine the timing for invoking the failure diagnosis of the combination weigher.

  By the way, if the hopper of the combination weigher breaks down for any reason, it is not possible to properly weigh the articles to be weighed using the hopper, so that the presence of defective products in the weight sorter and the failure of the weighing hopper It seems that it can be estimated. For example, Japanese Patent Application Laid-Open No. 2000-193515 discloses whether or not there is a deviation between an optimally combined combination weighing value and a weighing value after measuring the combined items together using a weight checker after discharging the combined articles. There has been proposed a combination weighing system having a function of estimating a weighing hopper that has caused a weighing defect by detecting. However, since the articles to be weighed in the weighing hopper that are not normal are not always selected as combination articles, the detection of defective products using such a weight sorter may not function effectively. That is, as in the technique described in this publication, it takes too much time to identify an abnormal weighing hopper in comparison between the combination weighing value and the post-weighing value. An example requiring a weighing cycle is shown), and it may be difficult to quickly return the combination weigher.

  The present invention has been made in view of such circumstances, and by appropriately setting the timing for invoking the failure diagnosis of the combination weigher, it is possible to quickly detect a failure such as a hopper of the combination weigher and to detect the combination weigher. The purpose is to provide a production system that can improve the yield and improve the efficiency.

In order to solve the above-mentioned problems, the present invention measures the weight of n (n is an integer greater than or equal to 2) supply hoppers, corresponding to each of the supply hoppers, and the articles to be weighed supplied from the supply hoppers. N weighing hoppers, and n weighing sensors arranged corresponding to each weighing hopper and capable of detecting the weight of the weighing object in the weighing hopper, wherein the weighing object is A combination process is executed for selecting a combination of the weighing hoppers in which the total weight of the articles to be weighed in the weighing sensor falls within a predetermined weight range at a weighing timing after a predetermined time from when the supply hopper is put into the weighing hopper. And a combination weigher that discharges the article to be weighed in the selected weighing hopper to the outside as a combination article;
A detection device capable of detecting an abnormality of the combination article;
With
When the combination weigher receives a detection signal from the detection device, a production system is provided in which a failure diagnosis of the combination weigher is executed at the weighing timing.

  In this way, the timing of activating the failure diagnosis of the combination weigher is set appropriately with the detection signal (foreign matter detection signal, etc.) output by the detection device as a trigger, so that the failure of the combination weigher hopper and the like can be promptly performed. Can be detected. Therefore, the combination weigher can be returned early, and the yield and efficiency of the combination weigher can be improved.

  For example, in the fault diagnosis, the measurement value of the k-th weighing hopper (k is an integer not less than 1 and not more than n) is sampled a predetermined number of times, and the change over time of the sampled measurement value increases. If it is in the direction, it may be diagnosed that the kth supply hopper corresponding to the kth weighing hopper is broken.

  Thereby, since the failure of the supply hopper of the combination weigher can be detected quickly, the supply hopper of the combination weigher can be returned early.

  In the fault diagnosis, the measurement value of the k-th weighing hopper (k is an integer not less than 1 and not more than n) is sampled for a predetermined number of times, and the change of the sampled measurement value with time is reduced. If it is in the direction, or if the sampled weighing value is an overdose exceeding a predetermined reference weight, it may be diagnosed that the k-th weighing hopper is broken.

  Thereby, since the failure of the weighing hopper of the combination weigher can be detected quickly, the weighing hopper of the combination weigher can be returned early.

The combination weigher is arranged corresponding to each of the supply hoppers, and includes n feeders for supplying the articles to be weighed to the supply hoppers,
In the fault diagnosis, the weighing value of the k-th weighing hopper (k is an integer not less than 1 and not more than n) is sampled a predetermined number of times, the sampled weighing value is near zero, and When the item to be weighed is supplied to the kth feeder corresponding to the kth weighing hopper, the kth weighing hopper, the kth supply hopper corresponding to the kth weighing hopper, or The kth feeder may be diagnosed as malfunctioning.

  Thereby, since the failure of the combination weigher (the failure of the supply hopper, the weighing hopper or the feeder) can be detected quickly, the combination weigher can be returned early.

  Here, the detection device may be an X-ray foreign matter detection device capable of detecting foreign matter in the combination article, and the detection signal is generated in the combination article using the X-ray foreign matter detection device. It may be a signal output from the X-ray foreign object detection device when a foreign object is detected.

  Further, the detection device may be a metal detection device capable of detecting a metal in the combination article, and the detection signal is generated when a metal is detected in the combination article using the metal detection device. A signal output from the metal detection device may be used.

  Further, the detection device may be a weight sorter capable of detecting the weight of the combination article, and the detection signal is obtained when the combination article outside the predetermined weight range is determined by the weight sorter. It may be a signal output from the weight sorter when detected at a frequency.

  The detection device may be a packaging machine capable of packaging the combination article, and the detection signal is output from the packaging machine when there is a seal failure of the combination article in the packaging machine. It may be a signal.

  The present invention has the above-described configuration, and by appropriately setting the timing of activating failure diagnosis of the combination weigher, it is possible to quickly detect a failure such as a hopper of the combination weigher and improve the yield of the combination weigher. And the effect of improving efficiency.

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

  FIG. 1 is a schematic diagram showing a configuration example of a production system according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a configuration example of an article supply system of the production system of FIG. FIG. 3 is a control block diagram of the production system of FIG.

  As shown in FIG. 1, the production system 100 of the present embodiment performs a combination process of the articles to be weighed P that can discharge the articles to be weighed P (see FIG. 2) for one bag within a predetermined weight range. An article supply system 50 for packaging (such as bagging and packaging) the articles to be weighed for one bag, transport conveyors 8 and 9 for transporting packages discharged from the article supply system 50, and transport conveyors 8 and 9. X-ray foreign matter detection device 4 for inspecting the presence or absence of foreign matter in the package to be transported, weight sorter 5 for checking the weight of the packaged product by weighing the packaged product, and sorting and sorting the defective packaged product. And a swing type distribution device 6 that performs the above-described operation.

  Note that the X-ray foreign matter detection device 4, the weight sorter 5, the sorting device 6, and the conveyors 8 and 9 are all known devices, and the detailed configurations of these devices 4, 5, 6, 8, 9 Description is omitted.

  Next, a specific configuration example of the article supply system 50 will be described in detail with reference to FIGS. 1 and 2.

  As shown in FIG. 1 and FIG. 2, the above-described article supply system 50 includes a supply device 1 that supplies an article to be weighed P to a combination weigher 2, a combination weigher 2 that obtains an optimum amount of an article to be weighed P, A packaging machine 3 capable of packing a combination article composed of a plurality of articles to be weighed P discharged from the combination scale 2 and a control device 40 are provided.

  The control device 40 is constituted by a microprocessor or the like, and as shown in FIG. 2, a CPU 26, a vibration control circuit 22, an A / D conversion circuit 23, a gate drive circuit 24, an I / O circuit 25, and an operation setting. A display 27 is provided. The operation setting indicator 27 is connected to the CPU 26, and using this operation setting indicator 27, operation ON-OFF control for operating the combination weigher 2, setting of various operation parameters, combinations described later. The calculation result can be displayed.

  As shown in FIG. 2, the combination weigher 2 includes a conical top cone 13 and a main feeder 14 on which the top cone 13 can be mounted and vibrated.

The supply device 1 is arranged above the top cone 13 and is constituted by, for example, a trough (large and long and thin container; trough) to which a vibrator is attached. When the article to be weighed P is put in the trough and the article to be weighed P is vibrated using a vibrator, the article to be weighed P is conveyed by vibration in the trough. Further, the supply device 1 has a discharge port 1 </ b> A for the article to be weighed P at a position facing the top of the top cone 13. Thereby, the articles P to be weighed supplied from the discharge port 1 </ b> A to the top cone 13 are uniformly distributed radially in the top cone 13 by the vibration energy of the main feeder 14. Further, a plurality of (here, n; n is an integer of 2 or more) linear feeder pans 15 ₁ to 15 _n on which the articles P to be weighed delivered from the top cone 13 are placed so as to be arranged around the top cone 13 are circles. It is arranged in a shape. These each linear feeder pan 15 ₁ ~ _n are linear feeder pan 15 ₁ corresponding to the ~ _n n pieces of linear feeder 16 ₁ ~ _n (feeder) is provided. Due to the vibration energy of each of the linear feeders 16 ₁ to _n, the article to be weighed P placed on the linear feeder pans 15 ₁ to _n is linearly conveyed by vibration, whereby the article to be weighed P is supplied to a supply hopper 17 ₁ described later. Supplied to ~ _n .

As shown in FIG. 2, the CPU 26 of the control device 40 vibrates to give a drive signal for vibration to the vibration portions (not shown) built in the supply devices _1, 14, 16 ₁ to _n. The control circuit 22 is used to control the supply operation of the article to be weighed P by the supply devices _1, 14, 16 ₁ to _n .

  In addition, a photoelectric level sensor 12 that detects the amount of the article P to be weighed on the top cone 13 is disposed at a position close to the top cone 13. The output side of the level sensor 12 is connected to the CPU 26 via the I / O circuit 25 of the control device 40. Based on the signal from the level sensor 12, the CPU 26 uses the vibration control circuit 22 to send a “link signal” (see FIG. 3) to the supply device 1 using the vibration control circuit 22 so as to keep the article P on the top cone 13 at a constant amount. Send. Thereby, supply operation | movement of the to-be-measured article P by the supply apparatus 1 is controllable. The “interlocking signal” is a signal sent from the combination weigher 2 (control device 40) to the supply device 1 when the amount of the articles to be weighed P supplied to the combination weigher 2 decreases. Is received by the supply device 1, the discharge of the article P to be weighed from the supply device 1 is appropriately executed.

Further, as shown in FIG. 2, below the linear feeder pans 15 ₁ to _n , n supply hoppers 17 ₁ to _n , n weighing hoppers 18 ₁ to _n , and n load cells 19 ₁ to n are provided. each _n (weight sensor), linear feeder 16 ₁ ~ _n (linear feeder pan 15 ₁ ~ _n) provided corresponding, are arranged in a circle.

Feed hopper 17 ₁ ~ _n receives the objects to be weighed articles P that are fed from the linear feeder pan 15 ₁ ~ _n, the gate when the weighing hoppers 18 ₁ ~ _n arranged beneath the feed hopper 17 ₁ ~ _n is empty Open and discharge the article P to be weighed to the weighing hoppers 18 ₁ to _n . Each weighing hopper 18 ₁ ~ _n, and the load cell 19 ₁ ~ _n are mounted, each load cell 19 ₁ ~ _n are the objects to be weighed articles P of the weighing hoppers 18 in ₁ ~ _n which corresponds to the load cell 19 ₁ ~ _n Measure the weight.

The combination processing by the control unit 40, n-number of weighing hoppers 18 ₁ weighing hoppers 18 ₁ combination of ~ _n should discharge the objects to be weighed articles P from the ~ _n (discharge combination) is determined, chosen for this discharge combination The gates of the weighing hoppers 18 ₁ to _n open, and the articles P to be weighed are discharged from the weighing hoppers 18 ₁ to _n onto the collecting chute 20. The collective chute 20 is provided below the weighing hoppers 18 ₁ to _n . A collective funnel 21 is disposed below the collective chute 20. The articles to be weighed P discharged from the weighing hoppers 18 ₁ to _n slide down on the collecting chute 20, are collected by the collecting funnel 21, and are temporarily stored in the collecting hopper (not shown).

As shown in FIG. 2, based on the control signal output from the CPU 26 of the control device 40, the gate drive circuit 24 of the control device 40 causes the supply hoppers 17 ₁ to _n and the weighing hoppers 18 ₁ to _n to The gate opening / closing operation is controlled. The output side of each load cell 19 ₁ to _n is connected to the input side of the A / D conversion circuit 23 of the control device 40 through an amplifier (not shown), and the output side of the A / D conversion circuit 23 is connected to the CPU 26. It is connected. Thereby, the above-described combination processing can be appropriately performed in the control device 40.

  In addition, the packaging machine 3 is arranged below the collective funnel 21, and as shown in FIG. 2, signals are transmitted and received between the CPU 26 and the packaging machine 3 via the I / O circuit 25 of the control device 40. Can be done. Specifically, when the combination weigher 2 (the control device 40) receives the “discharge command signal” (see FIG. 3) from the packaging machine 3, the gate of the above-described collective hopper is opened and the packaging machine for the articles P to be weighed. 3 is discharged. When the discharge of the article P to be weighed to the packaging machine 3 is completed, the combination weigher 2 transmits a “discharge completion signal” (see FIG. 3) to the packaging machine 3. Then, the article to be weighed P is packaged in the packaging machine 3.

  Here, in the production system 100 of the present embodiment, as shown in FIG. 3, an X-ray foreign matter detection device 4, a weight sorter 5, and a packaging machine 3 are used as detection devices that can detect an abnormality of a combination article. Illustrated.

  First, the contents of control of the production system 100 when the X-ray foreign object detection device 4 is used as an example of the detection device will be described.

  As shown in FIG. 3, when any foreign matter is detected in the combined article (packaged product) in the X-ray foreign matter detection device 4, the X-ray foreign matter detection device 4 sends a “foreign matter” to the control device 40 of the combination weigher 2. A detection signal "is transmitted. In this case, the control device 40 (CPU 26) uses the “foreign matter detection signal” output from the X-ray foreign matter detection device 4 as a detection signal for notifying the combination processing abnormality of the article P to be weighed in the combination weigher 2. Based on the above, after the combination process of the combination weigher 2 is temporarily interrupted, a failure diagnosis (details will be described later) of the combination weigher 2 is executed.

  As shown in FIG. 3, the X-ray foreign matter detection device 4 also transmits this “foreign matter detection signal” to the sorting device 6 via the weight sorter 5. Thereby, the packaged goods containing a foreign material are appropriately excluded from the production line by the sorting device 6.

  Next, the control content of the production system 100 when the weight sorter 5 is used as another example of the detection device will be described.

  As shown in FIG. 3, in the weight sorter 5, it is checked whether or not the weight of the combination article (packaged product) that has passed through the X-ray foreign matter detection device 4 is within a predetermined weight range. If the weight of the packaged product is within the weight range, the packaged product is processed as a non-defective product, and if the weight of the packaged product is outside the weight range, the packaged product is processed as a defective product. When the weight of the packaged product is out of the weight range, the “weight defect detection signal” is transmitted from the weight sorter 5 to the sorting device 6. Thereby, the packaged product outside the weight range is appropriately excluded from the production line by the sorting device 6. Further, in the weight sorter 5, when a packaged product outside the weight range is continuously detected at a predetermined frequency, a “weight failure frequent detection signal” is transmitted from the weight sorter 5 to the control device 40 of the combination weigher 2. Is done. In this case, the control device 40 (CPU 26) uses the “weight failure frequent occurrence detection signal” output from the weight sorter 5 as a detection signal notifying the abnormality of the combination processing of the article P to be weighed in the combination weigher 2. Based on the above, after the combination processing of the combination weigher 2 is temporarily interrupted, a failure diagnosis (details will be described later) of the combination weigher 2 is executed.

  Next, the control contents of the production system 100 when the packaging machine 3 is used as still another example of the detection device will be described.

  As shown in FIG. 3, when the article to be weighed P cannot be sealed well due to some cause in the packaging machine 3, a “seal failure detection signal” is transmitted from the packaging machine 3 to the control device 40 of the combination weigher 2. . For example, when the amount of the article to be weighed P that is put into the packaging machine 3 from the combination weigher 2 is too large, or the timing of the article to be weighed P that is put into the packaging machine 3 from the combination weigher 2 is the sealing timing of the packaging machine 3. If they do not match, the packaging machine 3 may not be able to seal the article to be weighed P well due to the biting of the article to be weighed P in the packaging machine 3 or the like. In this case, the control device 40 (CPU 26) uses the “seal failure detection signal” output from the packaging machine 3 as a detection signal for notifying the combination processing abnormality of the article P to be weighed in the combination weigher 2. In addition, the combination processing of the combination weigher 2 is temporarily interrupted, and then a failure diagnosis (details will be described later) of the combination weigher 2 is executed.

  Next, the detailed operation of the production system 100 of the present embodiment, including failure diagnosis of the combination weigher 2, will be described. The operation described below is realized by the control of the control device 40.

  FIG. 4 is a flowchart showing the operation of the production system of this embodiment.

  In order to understand the fault diagnosis of the combination weigher 2, it is necessary to know the operation cycle of the combination weigher 2. Therefore, first, the contents of this operation cycle will be outlined with reference to FIG. 4 and FIG.

FIG. 5 is a timing diagram showing an example of an operation cycle of the combination weigher. In FIG. 5, “weighing hopper gate open” refers to the time during which the gates of the weighing hoppers 18 ₁ to _n are open (more precisely, the time required from when the gate starts to open until it closes). At the timing when the combination weigher 2 receives the “discharge command signal”, the gates of the weighing hoppers 18 ₁ to 18 _n selected in the combination processing in the combination weigher 2 begin to open. “Supply hopper gate open” refers to the time during which the gates of the supply hoppers 17 ₁ to 17 _n are open (more precisely, the time required from when the gate starts to open until it closes). By "linear feeder ON", it refers to the time that linear feeder 16 ₁ ~ _n is vibrating. The “balance stabilization waiting time” is the time required for the weighing values of the weighing hoppers 18 ₁ to _n (output data of the load cells 19 ₁ to _n ) to be stabilized, and the supply hoppers 17 ₁ to 17 _n of one weighing cycle The starting point is when the gate begins to open. Initially the weighing article P is discharged from the feed hopper 17 ₁ ~ _n to the weighing hoppers 18 ₁ ~ _n, falling energy of the objects to be weighed articles P also transmitted to the weighing hoppers 18 ₁ ~ _n, weighing hoppers 18 ₁ ~ _n per se Since it vibrates, the measured value of the weighing hoppers 18 ₁ to 18 _n is not stable. Therefore, the “balance stabilization waiting time” is set from such a viewpoint.

As shown in FIG. 5, when receiving the “discharge command signal” from the packaging machine 3, the combination weigher 2 (control device 40) opens the gates of the weighing hoppers 18 ₁ to 18 _n selected in the combination processing in the combination weigher 2. Open.

When the gates of the weighing hoppers 18 ₁ to _n are opened, the articles to be weighed P in the weighing hoppers 18 ₁ to _n are discharged to the collecting chute 20, so that the weighing hoppers 18 ₁ to _n from which the articles to be weighed P are discharged are discharged. In the supply hoppers 17 ₁ to _n corresponding to, the gates of the supply hoppers 17 ₁ to 17 _n are opened to supply the subsequent articles P to the weighing hoppers 18 ₁ to 18 _n . In this case, subsequent weighing the article P is, so as not to pass through the gates of the weighing hoppers 18 ₁ ~ _n, it is necessary to close the gates of the weighing hoppers 18 ₁ ~ _n at the right time. _If the gates of the supply hoppers 17 ₁ to _n are opened with a sufficient delay from the timing at which the gates of the weighing hoppers 18 ₁ to _n are opened, it is possible to reliably avoid passing the gates of the weighing hoppers 18 ₁ to _n of the subsequent articles P to be weighed. However, if it does so, the time of one measurement cycle will become long and the measurement capability of the combination scale 2 will fall. Therefore, in the present embodiment, for the purpose of improving the weighing capability of the combination weigher 2, as shown in FIG. 5, taking into account the arrival delay time to the weighing hoppers 18 ₁ to _n such as the dropping time of the article P to be weighed, “Weighing hopper gate open” and “supply hopper gate open” overlap.

When the gates of the supply hoppers 17 ₁ to _n are opened, the articles to be weighed P in the supply hoppers 17 ₁ to _n are discharged to the weighing hoppers 18 ₁ to 18 _n , so the supply hopper 17 from which the articles to be weighed P have been discharged. in linear feeder 16 ₁ ~ _n corresponding to ₁ ~ _n, by initiating the vibration of the linear feeder 16 ₁ ~ _n, and supplies the subsequent weighing the article P to the feed hopper 17 ₁ ~ _n. In this case, subsequent weighing the article P is, so as not to pass through the gate of the feed hopper 17 ₁ ~ _n, it is necessary to close the gate of the feed hopper 17 ₁ ~ _n at the right time. In the present embodiment, for the purpose of improving the weighing capability of the combination weigher 2 described above, as shown in FIG. 5, the arrival delay time to the supply hoppers 17 ₁ to 17 _n such as the drop time of the article P to be weighed is taken into consideration. “Supply hopper gate open” and “straight forward feeder ON” overlap.

When the “balance stabilization waiting time” has elapsed, the measured values of the weighing hoppers 18 ₁ to _n (output data of the load cells 19 ₁ to _n ) can be stabilized. Therefore, at the weighing timing after the “balance stabilization waiting time” has elapsed, the combination weigher 2 (the control device 40) performs a combination calculation using the output data of each load cell 19 ₁ to _n as the measured value of the article P to be weighed, and each load cell The combination process of selecting the combination of the weighing hoppers 18 ₁ to _n in which the total weight of the articles P to be weighed in 19 ₁ to _n is within a predetermined weight range can be appropriately executed. Thereafter, the combination weigher 2 waits for reception of the “discharge command signal” from the packaging machine 3 in the next weighing cycle.

  Thus, in the combination scale 2 of the production system 100 of this embodiment, the operation | movement which throws in into the packaging machine 3 the to-be-measured article P once is carried out during the measurement cycle, The operation | movement is the step of FIG. The process is executed based on S25.

  On the other hand, as shown in FIG. 5, the combination weigher 2 (the control device 40) receives a “detection signal” (for example, “foreign matter detection signal” of the X-ray foreign matter detection device 4) from the detection device during one weighing cycle. ), The failure diagnosis of the combination weigher 2 is performed after the elapse of the next “balance stabilization waiting time” (measurement timing). The failure diagnosis is executed based on step S18 in FIG.

That is, the failure diagnosis of the combination weigher 2 according to the present embodiment is based on the measurement values of the weighing hoppers 18 ₁ to 18 _n (originally if the combination weigher 2 ₁ has no inconvenience after the “balance stabilization waiting time” has elapsed (measurement timing)). Focusing on the fact that the output data of the load cells 19 ₁ to _n is stable, there is an important feature in executing using the measured value after the “balance stabilization waiting time” has elapsed.

  Hereinafter, the operation of the production system 100 according to the present embodiment will be described in more detail with reference to FIGS. 4, 6, and 7.

  FIG. 6 is a flowchart showing the weighing value sampling operation of the weighing hopper in step S17 of FIG. FIG. 7 is a flowchart showing the failure diagnosis operation of the combination weigher in step S18 of FIG.

In the following description, the k-th weighing hopper 18 _k is abbreviated as “weighing hopper k”, the k-th supply hopper 17 _k is abbreviated as “supply hopper k”, and the k-th linear feeder 16 _k is abbreviated as “straight forward feeder k”.

  First, in step S1 of FIG. 4, it is determined whether or not the “failure diagnosis flag” is ON.

  At the initial stage, since the “failure diagnosis flag” is set to OFF, the operation program of the production system 100 proceeds to step S2.

  Next, in step S2, it is determined whether or not a “detection signal” is received from the detection device.

  Next, when there is no “detection signal” received from the detection apparatus, the operation program proceeds to step S24.

  In step S24, it is determined whether or not a “combination weigh stop flag” (see step S209 in FIG. 7 described later) is ON. This “combination weigher stop flag” is a flag that is set to ON when necessary when the failure of the combination weigher 2 is diagnosed. Set to OFF.

  Therefore, the operation program proceeds to step S25, in which “normal processing program” is executed, and the operation program returns to step S1.

  Next, when the “detection signal” is received from the detection device, in the next step S2, the operation program can proceed to step S3.

  In step S3, the “failure diagnosis flag” is set to ON, and the operation program proceeds to step S4.

In step S4, after the repetitive processing flag “k” is initialized, in steps S5 to S7, the k-th (k is 1 or more and n or less) from the first to n-th weighing hoppers 18 ₁ to _n. 1) is set to the diagnostic flag Fk of the weighing hopper k.

  Then, since the “failure diagnosis flag” is ON, in the next step S1, the operation program can proceed to step S8.

  In step S8, the repeated processing flag “k” is initialized again, and the operation program proceeds to step S9.

Note that once the “failure diagnosis flag” is turned ON, the first to nth weighing hoppers 18 ₁ to _n are shown in later-described steps S9 to S19 unless the “failure diagnosis flag” is turned OFF in step S23. The process is repeated. Therefore, here, representatively, the processing of step S9 to step S19 in the k-th (k is an integer of 1 to n) weighing hopper k will be described.

  In step S9, it is determined whether or not the diagnostic flag Fk of the weighing hopper k is “1”. At this stage, since the diagnosis flag Fk of the weighing hopper k is set to “1”, the operation program can proceed to step S10.

  Next, in step S10, it is determined whether or not the operation of the weighing hopper k is in the “balance stabilization waiting time”. If it is during the “balance stabilization waiting time”, the diagnostic flag Fk of the weighing hopper k is set to “2” in step S11.

  Then, in the next step S9, the diagnostic flag Fk of the weighing hopper k is not set to “1”, and the operation program can proceed to step S12.

  In step S12, it is determined whether or not the diagnostic flag Fk of the weighing hopper k is “2”. At this stage, since the diagnostic flag Fk of the weighing hopper k is set to “2”, the operation program can proceed to step S13.

  Next, in step S13, it is determined whether or not the operation of the weighing hopper k has passed the “balance stabilization waiting time”. If the “balance stabilization waiting time” has elapsed, the diagnostic flag Fk of the weighing hopper k is set to “3” in step S14. In addition, a sample counter (described later) for obtaining a measured value of the weighing hopper k is initialized.

  Then, in the next step S12, the diagnosis flag Fk of the weighing hopper k is not set to “2”, and the operation program can proceed to step S16.

  In step S16, it is determined whether or not the diagnostic flag Fk of the weighing hopper k is “3”. At this stage, since the diagnosis flag Fk of the weighing hopper k is set to “3”, the operation program can proceed to step S17.

  In step S17, it is determined whether or not the weighing value of the weighing hopper k (output data of the load cell k corresponding to the weighing hopper k) has been sampled a predetermined number of times. A specific sampling method will be described later. .

  In step S17, when the measured value of the weighing hopper k is sampled for a predetermined number of times, the operation program proceeds to step S18.

  In step S18, failure diagnosis of the combination weigher 2 is executed, and a specific diagnosis method will be described later.

  When the failure diagnosis of the combination weigher 2 ends, the process proceeds to step S19, and in step S19, the diagnosis flag Fk of the weighing hopper k is set to “0”.

  In step S20, the operation program increments the repetitive processing flag k by “1” and proceeds to step S21.

  In step S21, it is determined whether or not the processing flag k is “n + 1”. If it is not “n + 1”, the operation program returns to step S9, and the same is true for the (k + 1) -th weighing hopper (k + 1). Processing (processing shown in steps S9 to S19) is executed.

If the processing flag k is “n + 1” in step S21, the processing shown in step S9 to step S19 is performed for all the _first to _nth weighing hoppers 18 ₁ to _n , and therefore the operation program is Proceed to step S22.

In step S22, it is determined whether or not all diagnosis flags F1 to Fn of the weighing hoppers 18 ₁ to _n are set to “0”, and all the diagnosis flags F1 to Fn are not set to “0”. The operation program returns to step S8 via step S24, step S25 (when the combination stop flag is OFF), step S1 without turning off the “fault diagnosis flag”, and the processing after step S8 is performed again. Executed.

  In step S24, it is determined whether or not the “combination weigh stop flag” is ON. As described above, the “combination weigher stop flag” is a flag that is set to ON when necessary when a failure of the combination weigher 2 is diagnosed, and is a flag that is set to ON based on the diagnosis result of the combination weigher 2. is there.

  In step S24, when the “combination weigh stop flag” is set to ON, the operation program proceeds to step S26. And in step S26, the appropriate stop process by the failure of the combination scale 2 is performed. Therefore, in this case, the operation of failure diagnosis of the combination weigher 2 is forcibly terminated.

  If all the diagnosis flags F1 to Fn are set to “0” in step S22, the operation program proceeds to step S23, and in step S23, the “failure diagnosis flag” is turned off. Also in this case, the operation of failure diagnosis of the combination weigher 2 is completed. That is, if the “combination weigher stop flag” is not set to ON in step S24, the operation program proceeds to step S25, and then, in step S1, exits from the failure diagnosis operation of the combination weigher 2 and proceeds to step S2. move on.

  Thereafter, the same operation as described above is repeated.

  Next, the weighing value sampling operation of the weighing hopper k by the control device 40 will be described with reference to FIG.

  A program (hereinafter referred to as “sampling program”) that executes the weighing value sampling operation of the weighing hopper K is set so that it can be automatically activated at regular intervals.

First, in step S100, a repetitive processing flag k is initialized, and the sampling program proceeds to step S101. Here, the processing shown in steps S101 to S103 is repeated for the _first to _nth weighing hoppers 181 to _n . Therefore, representatively, the processing of step S101 to step S103 in the k-th weighing hopper k (k is an integer not less than 1 and not more than n) will be described.

  In step S101, it is determined whether or not the diagnostic flag Fk of the weighing hopper k is “3”. At the stage of executing the failure diagnosis of the combination weigher 2, as described above, the diagnosis flag Fk of the weighing hopper k is set to “3”. In this case, the sampling program proceeds to step S102.

  In step S102, the numerical value of the “sample counter” indicating the number of times the control device 40 has sampled the weighing value of the weighing hopper k (output data of the load cell k) is incremented by “1”, and the sampling program proceeds to step S103. . The numerical value of the “sample counter” is used to determine whether or not the weighing value of the weighing hopper k has been sampled a predetermined number of times in step S17 in FIG.

  In step S103, the control device 40 samples (reads) the weighing value of the weighing hopper k (output data of the load cell k), and stores this weighing value in an internal memory (not shown) such as a ROM or RAM.

  Next, in step S104, the sampling program increments the processing flag k by “1” and proceeds to step S105.

  In step S105, it is determined whether or not the processing flag k is “n + 1”. If it is not “n + 1”, the sampling program returns to step S100, and the same applies to the (k + 1) -th weighing hopper (k + 1). Processing (processing shown in steps S101 to S103) is executed.

If the processing flag k is “n + 1” in step S105, the processing shown in step S101 to step S103 is performed for all the _first to _nth weighing hoppers 18 ₁ to _n , so that the control device 40 The weighing value sampling operation of the weighing hopper k ends.

  Next, the operation of failure diagnosis of the combination weigher 2 by the control device 40 will be described with reference to FIG.

  Note that a program (hereinafter referred to as “diagnostic program”) for executing failure diagnosis of the combination weigher 2 is set so as to be activated in the process of step S18 of FIG.

  First, in step S103 of FIG. 6, the measured value of the weighing hopper k sampled by the control device 40 and stored in the internal memory is read in time series. Using the time series data of the measured values of the weighing hopper k, the following failure diagnosis is performed.

  In step S200, it is determined whether or not the change over time in the measured value of the weighing hopper k is in an increasing direction (for example, monotonically increasing).

  After the “balance stabilization waiting time” has elapsed (measurement timing), the measured value of the weighing hopper k should be stable against time changes. Nevertheless, if the change over time of the weighing value of the weighing hopper k is in the increasing direction, the weighing value of the weighing hopper k cannot be said to be in a normal state. In this case, even if an attempt is made to close the gate of the supply hopper k due to damage to the bearing portion or the coupling mechanism of the gate of the supply hopper k corresponding to the measurement hopper k (as shown in FIG. 5, the supply hopper k is closed at the measurement timing). The gate of the supply hopper k may be in a continuous full open state, a continuous half open state, or an incomplete open / close state. That is, if the gate of the supply hopper k breaks down and the gate is not properly opened and closed, the article P to be weighed continues to be supplied from the supply hopper k to the weighing hopper k even at the weighing timing. It is considered that the change over time in the measured value of increases.

  Therefore, if the change over time of the weighing value of the weighing hopper k is in an increasing direction, the diagnostic program diagnoses that the gate of the k-th supply hopper k corresponding to the k-th weighing hopper k has failed, The process proceeds from step S200 to step S201.

  In step S201, the diagnosis result of the combination weigher 2 (the gate of the k-th supply hopper k is broken) is notified to the operator by appropriate notification means (for example, the operation setting indicator 27 of the control device 40 shown in FIG. 2). Informed. Thereafter, in step S209, the “combination weigher stop flag” is set to ON, and the operation of the fault diagnosis of the combination weigher 2 ends. This “combination weigh stop flag” is used in step S24 in FIG. 4 to determine whether or not to execute the combination weigh stop process in step S26 in FIG. On the other hand, when the time-dependent change in the measured value of the weighing hopper k is not in the increasing direction, the diagnostic program proceeds from step S200 to step S202.

  In step S202, it is determined whether or not the change over time of the measured value of the weighing hopper k is in a decreasing direction (for example, monotonously decreasing).

  As described above, even when the change over time in the measurement value of the weighing hopper k is in the decreasing direction, the measurement value of the measurement hopper k cannot be said to be in a normal state. In this case, even if an attempt is made to close the gate of the weighing hopper k due to the damage of the bearing portion of the gate of the weighing hopper k or the coupling mechanism (as shown in FIG. 5, the weighing hopper k is closed at the weighing timing). There is a possibility that the gate of the hopper k is in a continuous half-open state or an incompletely opened / closed state. In other words, if the gate of the weighing hopper k fails and the gate is not properly opened and closed, the articles to be weighed P are gradually discharged from the weighing hopper k to the collecting chute 20 even at the weighing timing. It is considered that the change over time in the measured value of the hopper k decreases.

  Therefore, when the time-dependent change of the measurement value of the weighing hopper k is in the decreasing direction, the diagnosis program diagnoses that the gate of the kth weighing hopper k is broken, and proceeds from step S202 to step S203.

  In step S203, the diagnostic result of the combination weigher 2 (the gate of the k-th weighing hopper k is broken) is notified to the operator by appropriate notification means (for example, the operation setting indicator 27 of the control device 40 shown in FIG. 2). Informed. Thereafter, in step S209, the “combination weigher stop flag” is set to ON, and the operation of the fault diagnosis of the combination weigher 2 ends. On the other hand, when the time-dependent change in the measured value of the weighing hopper k is not in the decreasing direction, the diagnostic program proceeds from step S202 to step S204.

  In step S204, it is determined whether or not the weighing value of the weighing hopper k is near “0 g”.

  After the “balance stabilization waiting time” has elapsed (weighing timing), since the article P to be weighed is supplied into the weighing hopper k, the weighing value of the weighing hopper k should not be “0 g”. Nevertheless, if the weighing value of the weighing hopper k is near “0 g”, the weighing value of the weighing hopper k cannot be said to be normal. In this case, even if an attempt is made to open the gate of the supply hopper k in the “supply hopper gate open” (see FIG. 5) due to damage to the bearing portion of the gate of the supply hopper k and the coupling mechanism corresponding to the weighing hopper k, There is a possibility that the gate has fallen into a fully closed state. In addition, even if an attempt is made to close the gate of the weighing hopper k due to damage to the bearing portion of the gate of the weighing hopper k or the coupling mechanism, there is a possibility that the gate of the weighing hopper k is continuously opened. Further, due to the failure of the linear feeder k, there is a possibility that the linear feeder k is in an inoperable state in “straight forward feeder ON” (see FIG. 5).

  That is, when the gate of the supply hopper k fails and the gate is fully closed, or when the linear feeder k fails and the linear feeder k becomes inoperable, the article P to be weighed is supplied to the weighing hopper k. Since it is not possible, the measured value of the weighing hopper k is considered to be around “0 g”. Further, when the gate of the weighing hopper k breaks down and the gate is fully opened, it is considered that the measured value of the weighing hopper k is close to “0 g” because the article P to be weighed cannot be held in the weighing hopper k.

  However, even if the supply device 1 that is the supply source of the article to be weighed P fails for some reason, the article to be weighed P cannot be supplied to the linear feeder k. Therefore, in step S205, it is determined whether or not the weighing object P is present on the top cone 13. For example, the diagnostic program may determine the presence / absence of the article P to be weighed on the top cone 13 based on the level signal output from the level sensor 12. Further, the diagnosis program may determine the presence / absence of the article P to be weighed on the top cone 13 based on a weight signal output from a weight sensor (not shown) built in the main feeder 14.

  Therefore, if the change over time in the measurement value of the weighing hopper k is near “0 g”, the diagnostic program proceeds from step S204 to step S205.

  In step S205, the presence / absence of the article P to be weighed on the top cone 13 is determined. When the article P to be weighed on the top cone 13 exists, the diagnostic program reads the gate of the kth weighing hopper k, the gate of the kth supply hopper k corresponding to the kth weighing hopper k, or k It is diagnosed that the kth linear feeder k corresponding to the th weighing hopper k is broken, and the process proceeds from step S205 to step S208.

  In step S208, the diagnosis result of the combination weigher 2 (any one of the gate of the k-th weighing hopper k, the gate of the k-th supply hopper k, and the k-th straight feeder k) is informed appropriately. The operator is notified by means (for example, the operation setting display 27 of the control device 40 shown in FIG. 2). Thereafter, in step S209, the “combination weigher stop flag” is set to ON, and the operation of the fault diagnosis of the combination weigher 2 ends.

  Further, when the article to be weighed P on the top cone 13 does not exist, the diagnosis program diagnoses that the article to be weighed P is not supplied to the linear feeder k (for example, diagnoses a failure of the supply device 1). The process proceeds from step S205 to step S209. Thereafter, in step S209, the “combination weigher stop flag” is set to ON, and the operation of the fault diagnosis of the combination weigher 2 ends. On the other hand, when the time-dependent change in the measurement value of the weighing hopper k is not near “0 g”, the diagnostic program proceeds from step S204 to step S206.

  In step S206, it is determined whether or not the measured value of the weighing hopper k is an excessive amount equal to or greater than a predetermined reference weight. As the reference weight, for example, about twice the total weight of the normal articles P to be weighed into the weighing hopper k may be set.

  Since the articles P to be weighed in the weighing hopper k are discharged to the collecting chute 20 every weighing cycle, the weighing value of the weighing hopper k is normally set after the “balance stabilization waiting time” has elapsed (weighing timing). The total weight of the articles to be weighed P should be greatly deviated from being excessive. In spite of this, if the weighing value of the weighing hopper k is an excessive amount (for example, more than twice the total weight of the normal objects to be weighed P), the weighing value of the weighing hopper k is in a normal state. I can't say that. In this case, even if it is attempted to open the gate of the weighing hopper k in the “opening of the weighing hopper gate” (see FIG. 5) due to the damage of the bearing portion of the gate of the weighing hopper k and the coupling mechanism, It may be in a closed state. That is, when the gate of the weighing hopper k fails and the gate is fully closed, the article P to be weighed cannot be discharged from the weighing hopper k to the collecting chute 20. For this reason, in the weighing hopper K, since the first article to be weighed P and the subsequent article to be weighed P are added together, it is considered that the weighing value of the weighing hopper k becomes excessive.

  Therefore, when the weighing value of the weighing hopper k is excessive, the diagnosis program diagnoses that the gate of the k-th weighing hopper k is broken, and proceeds from step S206 to step S207.

  In step S207, the diagnostic result of the combination weigher 2 (the gate of the k-th weighing hopper k is broken) is notified to the operator by appropriate notification means (for example, the operation setting indicator 27 of the control device 40 shown in FIG. 2). Informed. Thereafter, in step S209, the “combination weigher stop flag” is set to ON, and the operation of the fault diagnosis of the combination weigher 2 ends. On the other hand, if the weighing value of the weighing hopper k is not excessive, the diagnostic program diagnoses that the combination weigher 2 has not failed, and sets the “combination stop flag” in step S209 to ON without setting the combination weigher 2 to ON. Finish the fault diagnosis.

As mentioned above, the combination weigher 2 production system 100 of this embodiment, n (n is an integer of 2 or more) and a supply hopper 17 ₁ ~ _n of, in response to the supply hopper 17 every ₁ ~ _n distribution is a n-number of weighing hoppers 18 ₁ ~ _n for weighing the weight of the objects to be weighed articles P supplied from the supply hopper 17 ₁ ~ _n, is arranged to correspond to the weighing hoppers 18 each ₁ ~ _n, weighing hoppers 18 _{1 N} load cells 19 ₁ to _n that can detect the weight of the article P to be weighed in _n .

In this combination weigher 2, the weighing hoppers 18 ₁ to _n whose total weight of the articles P to be weighed in the load cells 19 ₁ to _n falls within a predetermined weight range at the weighing timing after the “balance stabilization waiting time” has elapsed in the combination weigher 2. A combination process for selecting a combination is executed, and the articles to be weighed P in the selected weighing hoppers 18 ₁ to 18 _n are discharged to the outside as combined articles. Moreover, in this embodiment, the presence or absence of abnormality of the combination article is detected by various detection devices. As an example of this detection device, in this embodiment, there are an X-ray foreign matter detection device 4, a weight sorter 5, and a packaging machine 3. When the combination weigher 2 (the control device 40) receives a detection signal from the detection device, a failure diagnosis of the combination weigher 2 is executed at the above-described measurement timing.

  In this way, the timing for invoking the failure diagnosis of the combination weigher 2 is appropriately set in response to a detection signal (foreign matter detection signal or the like) output by a detection device such as the X-ray foreign matter detection device 4. A failure such as a hopper of the combination scale 2 can be detected quickly. Therefore, the combination balance 2 can be returned early, and the yield and efficiency of the combination balance 2 can be improved.

  For example, as described above, the weighing value of the k-th weighing hopper k (k is an integer not less than 1 and not more than n) is sampled by the number of times of sampling, and the time-dependent change of the sampled weighing value is in the increasing direction. In this case, there is some inconvenience in opening and closing the gate of the kth supply hopper k corresponding to the kth weighing hopper k, and it is diagnosed that the gate is broken.

Thereby, since the gate failure of the supply hoppers 17 ₁ to _n of the combination weigher 2 can be detected quickly, the supply hoppers 17 ₁ to 17 _n of the combination weigher 2 can be returned early.

  In addition, when the change of the sampled measurement value with time is in a decreasing direction, or when the sampled measurement value is an excessive amount exceeding a predetermined reference weight, nothing is done to open and close the gate of the k-th measurement hopper k. Such inconvenience occurs, and it is diagnosed that the gate is broken.

Thereby, since the gate failure of the weighing hoppers 18 ₁ to _n of the combination weigher 2 can be detected quickly, the weighing hoppers 18 ₁ to _n of the combination weigher 2 can be returned early.

Further, the combination weigher 2 of the present embodiment is arranged to correspond to the feed hopper 17 every ₁ ~ _n, comprises n linear feeder 16 ₁ ~ _n supplies weighing articles P to the feed hopper 17 ₁ ~ _n In the present embodiment, failure diagnosis of the following combination weigher 2 can also be performed.

  When the sampled measured value is close to zero and the item P to be weighed is supplied to the kth linear feeder k corresponding to the kth weighing hopper, the gate of the kth weighing hopper, k The gate of the k-th supply hopper corresponding to the th-th weighing hopper k or the k-th linear feeder corresponding to the k-th weighing hopper k is diagnosed as malfunctioning.

As a result, the failure of the combination weigher 2 (the gate of the supply hoppers 17 ₁ to _n , the gate of the weighing hoppers 18 ₁ to _n or the failure of the linear feeders 16 ₁ to _n ) can be detected quickly. Return is possible.

As described above, based on the level signal output from the level sensor 12 and the weight signal output from the weight sensor built in the main feeder 14, the presence or absence of the article P to be weighed on the top cone 13 can be determined. As a result, it is possible to grasp whether or not the article to be weighed P is supplied to the k-th linear feeder k. Further, by confirming the measurement value of the (k + 1) -th weighing hopper (k + 1) or the (k-1) -th weighing hopper (k-1) located on both sides of the k-th weighing hopper k, k It may be ascertained whether or not the article P to be weighed is supplied to the th-th linear feeder k.
(Modification)
FIG. 8 is a schematic diagram showing a configuration example of a production system according to a modification of the present invention. FIG. 9 is a control block diagram of the production system of FIG.

  In the production system 100 of the above-described embodiment, the X-ray foreign matter detection device 4, the weight sorter 5, and the packaging machine 3 are illustrated as examples of the detection device that can detect abnormality of the combined article. In the production system 110 of this modification, as shown in FIG. 9, a metal detection device 7 that can detect metal in the combined article is used instead of the X-ray foreign matter detection device 4.

  Therefore, the control contents of the production system 110 when the metal detection device 7 is used as an example of the detection device will be described. In addition, since the other structure and operation | movement of the production system 110 by this modification are the same as the structure and operation | movement of the production system 100 of the above-mentioned embodiment, these description is abbreviate | omitted.

  As shown in FIG. 9, when any metal is detected in the combination article (packaged product) in the metal detection device 7, a “metal detection signal” is sent from the metal detection device 7 to the control device 40 of the combination weigher 2. Sent. In this case, the control device 40 (CPU 26) uses the “metal detection signal” output from the metal detection device 7 as a detection signal notifying the abnormality of the combination processing of the article P to be weighed in the combination weigher 2. In addition, after the combination processing of the combination weigher 2 is temporarily suspended, the above-described failure diagnosis of the combination weigher 2 is executed. As shown in FIG. 9, the metal detection device 7 also transmits a “metal detection signal” to the sorting device 6 via the weight sorter 5. Thereby, the package containing metal is appropriately excluded from the production line by the sorting device 6.

  According to the present invention, it is possible to quickly detect a failure such as a hopper of the combination weigher and to improve the yield and efficiency of the combination weigher by appropriately setting the timing at which the failure diagnosis of the combination weigher is activated. Therefore, the present invention is useful for a production system having a combination weigher that obtains an appropriate amount of articles to be weighed.

It is the schematic diagram which showed the example of a structure of the production system by embodiment of this invention. It is the schematic diagram which showed the structural example of the article supply system of the production system of FIG. It is a control block diagram of the production system of FIG. It is the flowchart which showed operation | movement of the production system of embodiment of this invention. It is the timing figure which showed the example of the driving cycle of the combination scale. It is the flowchart which showed the measurement value sampling operation | movement of the measurement hopper in step S17 of FIG. It is the flowchart which showed the operation | movement of the failure diagnosis of the combination weigher in step S18 of FIG. It is the schematic diagram which showed the structural example of the production system by the modification of this invention. It is a control block diagram of the production system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Supply apparatus 2 Combination balance 3 Packing machine 4 X-ray foreign material detection apparatus 5 Weight sorter 6 Sorting apparatus 7 Metal detection apparatuses 8 and 9 Conveyor 12 Level sensor 13 Top cone 14 Main feeder 15 ₁ to _n Straight feeder pan 16 ₁ ~ _n linear feeder 17 ₁ ~ _n feed hopper 18 ₁ ~ _n weighing hoppers 19 ₁ ~ _n load cell 20 collecting chute 21 set the funnel 22 the vibration control circuit 23 A / D converter circuit 24 a gate drive circuit 25 I / O circuit 26 CPU
27 Operation setting indicator 40 Control device 100, 110 Production system P Article to be weighed

Claims (6)

n (n is an integer of 2 or more) supply hoppers, corresponding to each of the supply hoppers, n feeders for supplying the articles to be weighed to the supply hopper, corresponding to each of the supply hoppers N weighing hoppers for weighing the objects to be weighed supplied from the supply hopper, and corresponding to each weighing hopper, and detecting the weight of the objects to be weighed in the weighing hoppers N weighing sensors that can be used, and at a weighing timing after a certain time has elapsed since the article to be weighed is put into the weighing hopper from the supply hopper, the total weight of the articles to be weighed in the weighing sensor is predetermined. A combination for executing a combination process for selecting the combination of the weighing hoppers within the weight range and discharging the to-be-measured articles in the selected weighing hopper to the outside as a combination article And,
A detection device capable of detecting an abnormality of the combination article;
With
When the combination weigher receives a detection signal from the detection device, a failure diagnosis of the combination weigher is executed at the weighing timing. In the failure diagnosis, the kth (k is an integer between 1 and n) The weighing value of the weighing hopper is sampled for a predetermined number of samples, the sampled weighing value is near zero, and the article to be weighed is supplied to the k-th feeder corresponding to the k-th weighing hopper. when is supplied, the k-th weighing hopper, k-th supply hopper corresponding to the k-th weighing hopper or the k-th production system supplier is, Ru is diagnosed of,. n feeding hoppers (n is an integer of 2 or more), n weighing hoppers arranged corresponding to each of the feeding hoppers, for weighing the weight of the articles to be weighed supplied from the feeding hoppers, and the weighing It is arranged corresponding to each hopper, and has n weighing sensors that can detect the weight of the article to be weighed in the weighing hopper, and the article to be weighed is put into the weighing hopper from the supply hopper And a combination process for selecting a combination of the weighing hoppers in which the total weight of the articles to be weighed in the weighing sensor falls within a predetermined weight range at a weighing timing after a predetermined time from the weighing sensor, and in the selected weighing hopper A combination scale for discharging the article to be weighed to the outside as a combination article;
A detection device capable of detecting an abnormality of the combination article;
With
When the combination weigher receives a detection signal from the detection device, a failure diagnosis of the combination weigher is executed at the weighing timing,
The detection device is an X-ray foreign matter detection device capable of detecting foreign matter in the combination article, and the detection signal is detected when a foreign matter is detected in the combination article using the X-ray foreign matter detection device. production system Ru signal der output from the X-ray foreign material detecting device. n feeding hoppers (n is an integer of 2 or more), n weighing hoppers arranged corresponding to each of the feeding hoppers, for weighing the weight of the articles to be weighed supplied from the feeding hoppers, and the weighing It is arranged corresponding to each hopper, and has n weighing sensors that can detect the weight of the article to be weighed in the weighing hopper, and the article to be weighed is put into the weighing hopper from the supply hopper And a combination process for selecting a combination of the weighing hoppers in which the total weight of the articles to be weighed in the weighing sensor falls within a predetermined weight range at a weighing timing after a predetermined time from the weighing sensor, and in the selected weighing hopper A combination scale for discharging the article to be weighed to the outside as a combination article;
A detection device capable of detecting an abnormality of the combination article;
With
When the combination weigher receives a detection signal from the detection device, a failure diagnosis of the combination weigher is executed at the weighing timing,
The detection device is a metal detection device capable of detecting metal in the combination article, and the detection signal is detected when metal is detected in the combination article using the metal detection device. production system Ru signal der output from. n feeding hoppers (n is an integer of 2 or more), n weighing hoppers arranged corresponding to each of the feeding hoppers, for weighing the weight of the articles to be weighed supplied from the feeding hoppers, and the weighing It is arranged corresponding to each hopper, and has n weighing sensors that can detect the weight of the article to be weighed in the weighing hopper, and the article to be weighed is put into the weighing hopper from the supply hopper And a combination process for selecting a combination of the weighing hoppers in which the total weight of the articles to be weighed in the weighing sensor falls within a predetermined weight range at a weighing timing after a predetermined time from the weighing sensor, and in the selected weighing hopper A combination scale for discharging the article to be weighed to the outside as a combination article;
A detection device capable of detecting an abnormality of the combination article;
With
When the combination weigher receives a detection signal from the detection device, a failure diagnosis of the combination weigher is executed at the weighing timing,
The detection device, the a combination product packaging packing machine, wherein the detection signal, the when there is a seal failure of the combined article in the packaging machine, the signal der Ru raw output from the packaging machine Production system. In the failure diagnosis, the measurement value of the k-th weighing hopper (k is an integer not less than 1 and not more than n) is sampled for a predetermined number of times, and the time-dependent change of the sampled measurement value increases. 5. The production system according to claim 1, wherein in some cases, the k-th supply hopper corresponding to the k-th weighing hopper is diagnosed as having a failure. In the failure diagnosis, the measurement value of the k-th weighing hopper (k is an integer not less than 1 and not more than n) is sampled for a predetermined number of times, and the change with time of the sampled measurement value decreases. 5. The method according to claim 1, wherein the k-th weighing hopper is diagnosed as having a failure when the sampled weight value is an excessive amount that exceeds a predetermined reference weight. Production system.

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