JP4707344B2 - Weighing system - Google Patents

Description

  The present invention relates to a weighing system, and more particularly to a weighing system capable of quickly diagnosing the presence or absence of an abnormality in a weighing head.

  Conventionally, a large number of articles are appropriately divided into a predetermined number of weighing hoppers, the weights of these articles are weighed by a weighing sensor, and the weight values are combined and calculated by a computer to obtain a preset weight. There is known a combination weighing device that employs a mechanism in which the closest combination is selected and packed.

  Incidentally, such a weighing hopper is detachably disposed on the combination weighing device in consideration of maintenance work such as cleaning. If the weighing hopper removed from the combination weighing device in the maintenance work is not correctly reattached to the combination weighing device, the weight of the article cannot be accurately measured.

  In addition, the failure of the weighing sensor (load cell or force balance) corresponding to the weighing hopper cannot be ignored as the number of weighing hoppers increases.

  The development of technology that makes it possible to diagnose weighing hoppers and weighing sensors (hereinafter collectively referred to as weighing heads) that have caused weighing failures in response to such situations has improved the reliability of combination weighing devices and It is desired from the viewpoint of improving the efficiency of repair work of the combination weighing device.

For example, after discharging the combination weighing value optimally combined with the combination weighing article and measuring them together, the presence or absence of a deviation from the weighing value is detected, so that the weighing head that caused the weighing error can be detected. A combination weighing system having an estimation function has been proposed (see Patent Document 1 as a conventional example).
JP 2000-193515 A

  However, in the combination weighing system shown in the above-mentioned conventional example, whether or not the weighing head that caused the weighing failure can be finally determined depends on the use state of the weighing head when the combination calculation is performed in the combination weighing device. Thus, there are cases in which such a measuring method of the weighing head lacks speediness and certainty.

  The present invention has been made in view of such circumstances, and the purpose of the present invention is to measure the specific measurement by the measurement head abnormality diagnosis mode in which a specific measurement head assumed to be used as a cause of measurement failure is always created. An object of the present invention is to provide a weighing system that quickly diagnoses the presence or absence of an abnormality in a head and reliably identifies the weighing head that has caused a measurement failure.

In order to solve the above-described problems, a weighing system according to the present invention includes a weighing hopper that is divided into a plurality of articles and a weighing sensor that measures an individual weight that is the weight of the article that is loaded into the weighing hopper. An article of a weighing hopper that has a plurality of weighing heads, is combined and weighed by selecting one of the weighed individual weight combinations that is within a preset allowable weight range, and is weighed in combination. A combination weighing device for discharging the combination weighing article to the outside, a weight measuring means for checking a weight by weighing the discharged combination weighing article, and a control means. However, after performing the combination weighing and selecting a specific weighing head from the plurality of weighing heads, the specific weighing head is preferentially included. The combination weighing is performed and the value of the combination weighing is acquired as a combination weight diagnosis value, while the weight of the combination weighing article corresponding to the combination weight diagnosis value is measured by the weight measuring unit and acquired as the check weight diagnosis value. Then, the combination weighing device is configured to execute abnormality diagnosis for the specific weighing head based on the combination weight diagnostic value and the check weight diagnostic value, and when the control unit performs abnormality diagnosis for the specific weighing head. However, by discharging the dummy combination weighing article to the outside, it is recognized that the combination weighing article corresponding to the combination weight diagnostic value has reached the weight measuring means .

As a result, the weighing system adopts a weighing head abnormality diagnosis mode that creates a situation in which a specific weighing head that is assumed to be a cause of weighing failure is used, and quickly diagnoses the presence or absence of an abnormality in that specific weighing head. It becomes possible. Further, according to such a configuration, the weight of the dummy combination weighing article is, for example, a weight outside the allowable weight range, and the control unit receives the weight value from the weight measurement unit as a boundary. Thereafter, the combination weighing article that reaches the weight measuring means can be identified as the one after the shift from the normal combination calculation mode to the weighing head abnormality diagnosis mode for the specific weighing head.

  The operation of the weighing head abnormality diagnosis mode is more specifically described. When the numerical value based on the difference between the combination weight diagnosis value and the check weight diagnosis value exceeds a predetermined allowable value, the control means detects an abnormality in the specific weighing head. Diagnose that there is.

  Here, an example of the weight measuring means is constituted by a weighing conveyor on which the combination weighing article is placed and a load cell connected to the weighing conveyor.

  And a storage unit that stores the combination weight diagnosis value and the check weight diagnosis value in association with the number of times of abnormality diagnosis for the specific weighing head, and the control means includes the combination weight diagnosis value and the check Each time the weight diagnosis value is read from the storage unit, the difference between the combination weight diagnosis value and the check weight diagnosis value can be calculated.

  As a result, the weighing system can cope with a time lag corresponding to the transport time of the combination weighing article to the weight measuring means, which occurs between the measurement of the combination weight diagnosis value and the check weight diagnosis value. The control means can appropriately read the combination weight diagnostic value and the check weight diagnostic value corresponding to the specific weighing head to be diagnosed and the number of times of abnormality diagnosis from the storage unit.

  Note that examples of the weight of the dummy combination weighing article include a weight that exceeds the upper limit value of the allowable weight range or a weight that is less than the lower limit value of the allowable weight range.

  Here, after the weight of the dummy combination weighing article is weighed by the weight measuring unit, the control unit starts acquiring the check weight diagnostic value, so that the control unit The acquisition can be carried out without mistaking the start of weighing.

  Similarly, after the dummy combination weighing article is discharged to the outside, the control unit starts acquiring the combination weight diagnosis value, so that the control unit erroneously starts the measurement of the combination weight diagnosis value. The acquisition can be performed without it.

  As another method of using the difference, the control means may determine whether or not the measurement reference point of the weight measuring means is fluctuating based on the difference.

  According to the present invention, the presence or absence of an abnormality in a specific weighing head is quickly diagnosed by the weighing head abnormality diagnosis mode in which a situation in which a specific weighing head assumed as a cause of measurement failure is surely used is created. A weighing system can be obtained that reliably identifies the weighing head that caused the failure.

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

  FIG. 1 is a block diagram showing a system configuration of a weighing system according to an embodiment of the present invention.

  The weighing system 100 mainly includes a combination weighing device 1 that performs a combination weighing in which a plurality of articles are divided and weighed and one bag of articles within a preset allowable weight range is discharged to the outside. A packaging device 2 that packs one bag of articles discharged from the device 1 and a combination weighing article K that is packed and discharged by the packaging device 2 (packing pack of articles P constituting the combination weighing article) , Hereinafter referred to as a bag pack K), and the weight of the bag pack K transported by the transfer conveyor 3 (more precisely, the total weight of the articles P in the bag pack K, The weight of the pack bag is tared.) The weight checker 4 (weight measuring means) for checking the weight by measuring the weight, the inspection device 20 for inspecting the state of the packed pack K, the non-defective product of the packed pack K, Bad A swing type sorting device 22 for sorting the door, is constituted by.

Here, the combination weighing device 1 is arranged corresponding to the _n weighing hoppers H ₁ , H ₂ ... H _n and the respective weighing hoppers H ₁ , H _2. And weighing heads KH ₁ , KH ₂ ... KH _n comprising the weighing sensors (load cells LC ₁ , LC ₂ ... LC _n ). That is, each weighing hopper H _1, H ₂ ··· H _n, each weighing hopper H _1, H ₂ ··· H weight-on article P into _n load cells as possible weighing (individual weight) LC ₁ , LC ₂ ... Supported by LC _n .

The output side of each load cell LC ₁ , LC ₂ ... LC _{n is connected to} the input side of the corresponding operational amplifier AMPd ₁ , AMPd ₂ ... AMPd _n via the measurement signal lines a 1, a 2. operational amplifier AMPd _1, AMPd ₂ ··· AMPd _n respectively output side to the input side of the corresponding analog-digital converter _{a / Dd 1, a / Dd} 2 ··· a / Dd n of the analog-to-digital converter the _{a / Dd 1, a / Dd} 2 ··· a / Dd n of output side control unit via the I / O circuit 5 (CPU 6), is connected.

  An operation display unit 12 including a screen unit for displaying various display modes and an input unit such as an operation / stop switch and a function key is connected to the CPU 6 via the I / O circuit 5. Note that a storage unit (memory element) 7 such as a ROM or a RAM is connected to the CPU 6 via a bus line (not shown).

Thus, after the analog weighing signals generated by the load cells LC ₁ , LC ₂ ... LC _n are amplified by the operational amplifiers AMPd ₁ , AMPd ₂ ... AMPd _n , the analog / digital converters A / Dd ₁ , A the / Dd ₂ ··· a / Dd _n are converted into digital weight signals are inputted to the CPU6 through the I / O circuit 5, thereby CPU6 is, within the allowable weight range which combination of weighing values are set in advance performing a combination weighing of selecting the optimum combination of weighing hoppers H _1, H ₂ ··· H _n to fit.

  The weight checker 4 is a load cell LCC that weighs the weight of the bag pack K discharged from the transport conveyor 3, and a weight that places the bag pack K so that the load cell LCC can measure the weight of the bag pack K. And a conveyor V.

  The photoelectric sensor PH is installed in the vicinity of the carry-in side of the weighing conveyor V. Thereby, the position detection signal for detecting that the photoelectric sensor PH has reached the position where the weight of the packaged pack K carried into the weighing conveyor V can be measured is controlled via the I / O circuit 8 ( CPU 9).

  The output side of the load cell LCC is the input side of the operational amplifier AMPC, the output side of the operational amplifier AMPC is the input side of the analog / digital converter A / DC, and the output side of the analog / digital converter A / DC is the I / O circuit. 8 is connected to the CPU 9 via 8.

  An operation display unit 13 including a screen unit for displaying various display modes and an input unit such as an operation / stop switch or a function key is connected to the CPU 9 via the I / O circuit 8.

  Note that a storage unit (memory element) 10 such as a ROM or a RAM is connected to the CPU 9 via a bus line (not shown).

  Thus, the packaged pack K composed of a plurality of packed products is transported by the transport conveyor 3 and sent to the weighing conveyor V of the weight checker 4. Based on the detected output signal, the weight of the bag pack K is measured by the load cell LCC.

  The analog weighing signal of the bag pack K generated by the load cell LCC is amplified by the operational amplifier AMPC, converted into a digital weighing signal by the analog / digital converter A / DC, and passed through the I / O circuit 8 to the CPU 9. Is input.

  An example of the inspection device 20 is a foreign material inspection device capable of inspecting foreign materials such as metal pieces mixed in the bag of the packaged pack K, and is connected to the CPU 9 via the I / O circuit 8.

  Further, the CPU 6 and the CPU 9 are connected to each other via the serial communication I / O circuits 23 and 24 and the serial communication line 11, and various data can be transmitted and received between them. K weight data is appropriately transmitted and received between the CPU 6 and the CPU 9.

  The swing type sorting device 22 capable of sorting the packed pack K is connected to the CPU 9 via the I / O circuit 21, whereby the CPU 9 can send the weight data of the packed pack K output from the weight checker 4, Based on the output information of the inspection device 20 and the like, an appropriate sorting operation (for example, sorting of defective products out of the allowable weight range, sorting of defective products containing foreign matters, etc.) is executed by the swing type sorting device 22. That is, the non-defective packaged pack K is conveyed as it is to the subsequent process, while the defective packaged pack K is stored in the defective carton 25 by the swing operation of the swing sorter 22.

  Next, a configuration related to the weighing head abnormality diagnosis mode by the weighing system 100 will be described.

The control means (CPU 6) preferentially includes the specific measuring head after selecting the specific measuring head (the measuring target measuring head) from the measuring heads KH ₁ , KH ₂ ... KH _n ( Hereinafter, this is referred to as a “diagnostic weighing head group”), and the combination weighing is performed, and the value of the combination weighing is acquired as the combination weight diagnosis value.

That is, a specific weighing head (for example, the first weighing head KH ₁ ) is intentionally selected, and a situation is formed in which this specific weighing head KH ₁ is preferentially added to the combination operation of the combination weighing article K. .

  Further, the control means (CPU 9) is combined by the above-described diagnostic weighing head group, and the weight of the bag pack K corresponding to the combined weight diagnostic value is measured by the weight checker 4, and this weight value is checked. Configured to get as.

  Thus, the control means (one of the CPU 6 and the CPU 9) diagnoses an abnormality for a specific weighing head based on the combination weight diagnosis value and the check weight diagnosis value (the operation of this abnormality diagnosis will be described in detail later). Can be performed.

  Next, the configuration of the head check memory shown in FIG. 2 will be described.

  A head check memory for storing the combined weight diagnostic value measured by the diagnostic weighing head group, the check weight diagnostic value measured by the weight checker 4, and the absolute value of the difference between the combined weight diagnostic value and the check weight diagnostic value. However, it is built in the storage unit 10 connected to the CPU 9 for the following reason. The head check memory may be constituted by a predetermined area of the memory constituting the storage unit 10 or may be constituted by a dedicated memory separate from this.

  Further, here, the combined weight diagnostic value measured by the diagnostic measuring head group is transmitted to the CPU 9 (storage unit 10) via the serial communication line 11, and the abnormality diagnosis for the specific measuring head is executed by the CPU 9. It will be explained on the assumption.

  Specifically, the weight of the article P is weighed from the diagnostic weighing head group, and the combined weight value of these weights is sequentially transmitted to the CPU 9 that controls the weight checker 4 as a combined weight diagnostic value. Then, the sent combination weight diagnosis value is stored in the head check memory built in the storage unit 10 by the CPU 9.

  However, a time lag corresponding to the transport time of the bag pack K to the weight checker 4 occurs between the measurement time of the combination weight diagnosis value and the corresponding check weight diagnosis value measurement time (packed pack). A method for recognizing the arrival time of K to the weight checker 4 will be described later.)

  For this reason, after the combination weight diagnostic value of the bag pack K is measured by the diagnostic weighing head group, the subsequent bag is measured until the check weight diagnostic value of the bag pack K is measured by the weight checker 4. The weighing of the combination weight diagnostic value of the pack K is performed by the diagnostic weighing head group.

  Therefore, the storage unit 10 connected to the CPU 9 incorporates a head check memory as shown in FIG. 2, and a combined weight diagnosis for the bag pack K for each memory block (a set of unit memory areas corresponding to addresses). Value and check weight diagnostic value and the absolute value of the difference between the two are stored in association with a specific weighing head to be diagnosed (for example, identified by the number of the weighing head) and its weighing order (number of times of abnormality diagnosis). Will be.

For example, in the head check memory shown in FIG. 2, first, measurement is performed according to the number of times of abnormality diagnosis (here, 10 times) by the measurement weighing head group of various patterns including the _first weighing head KH _1. The combined weight diagnostic values A1 to A10 are sequentially written in the first row of the memory block (1) to the first row of the memory block (10) in association with the number of abnormality diagnoses.

  Further, when 10 bagging packs K that are combined and weighed by the diagnostic weighing head groups of various patterns reach the weight checker 4, their weights are respectively set as check weight diagnosis values W1 to W10 by the weight checker 4. The check weight diagnosis values W1 to W10 are weighed and sequentially written in the second row of the memory block (1) to the second row of the memory block (10) in association with the abnormality diagnosis count.

  When the weighing of the combined weight diagnostic values A1 to A10 and the weighing of the check weight diagnostic values W1 to W10 are completed over the entire abnormality diagnosis, the CPU 9 sets these weight values A1 to A10 and W1 to W10 as the number of abnormality diagnoses. Correspondingly, whenever reading from the head check memory, absolute values Z1 to Z10 of the difference between the two are calculated, and the values are calculated in the third row of the memory block (1) to the third row of the memory block (10). It is written sequentially.

  Thus, the weighing system 100 causes a time lag corresponding to the transport time of the bag pack K to the weight checker 4 that occurs between the weighing of the combination weight diagnostic values A1 to A10 and the weighing of the check weight diagnostic values W1 to W10. The CPU 9 is configured so that the CPU 9 can appropriately read the combination weight diagnosis values A1 to A10 and the check weight diagnosis values W1 to W10 corresponding to the specific weighing head to be diagnosed and the number of abnormality diagnosis thereof from the head check memory. Has been.

  According to the weighing system 100 described above, the presence or absence of an abnormality in a specific weighing head can be quickly determined by the weighing head abnormality diagnosis mode in which a situation in which a specific weighing head that is assumed to be a cause of measurement failure is always used is created. Diagnosis is possible, and as a result, the weighing head that causes the weighing failure can be reliably identified.

  Next, an operation example of the weighing head abnormality diagnosis mode for the diagnostic weighing head group including the specific weighing head executed by the weighing system 100 will be described with reference to the drawings.

  First, a method for causing the control means (CPU 9) for controlling the weight checker 4 to recognize the arrival point of the packed pack K discharged to the outside by the diagnostic weighing head group will be described.

  The time lag corresponding to the transfer time of the bag pack K described above to the weight checker 4 is not constant depending on the production line situation, and the time for the bag pack K to reach the weight checker 4 is accurately predicted. It is difficult to do.

  For this reason, it is indispensable for the CPU 9 that controls the weight checker 4 to accurately recognize that the diagnostic packed bag K has reached the weight checker 4.

  In response to such a problem, the combination weighing device 1 intentionally immediately before the diagnostic bag K is discharged to the outside, such as an excessive weight or a light weight with respect to the allowable weight range of the bag K. One dummy bag pack (dummy combination weighing article) having an unexpected weight is produced and discharged to the outside. When this dummy bag pack reaches the weight checker 4, the weight checker 4 outputs the weight data of the dummy bag pack to the CPU 9 as an unexpected weight value.

  Then, the CPU 9 changes from the normal combination calculation mode to the weighing head abnormality diagnosis mode for the specific weighing head, after reaching the weight checker 4 at the time when the unexpected weight value is received. It becomes possible to identify that it is after the transfer, and the CPU 9 can process the weight data of the packaged pack K measured by the weight checker 4 after that time as the check weight diagnosis value.

  Such a dummy packed pack is selected as a defective product by the swing type sorter 22 and stored in the carton 25.

  Here, an example of an unexpected weight value in the dummy bag pack will be described with reference to FIG. In FIG. 5, the horizontal axis represents the weight value of the packed pack, and the vertical axis represents the number of the packed pack. The number distribution curve (thick solid line) in the allowable weight range of the packed pack and the desired overweight range (thin) (Solid line) and a desirable light weight range (thin solid line).

  According to FIG. 5, the number distribution curve shows a normal distribution or a distribution close to the target weight T (two-dot chain line) between the upper and lower limits H and L of the allowable weight range of the bag pack K. .

  Here, the excess weight is a weight that sufficiently exceeds the upper limit value H of the allowable weight range of the bag pack K centering on the target weight T of the bag pack K, and the preferable overweight range is understood from FIG. As described above, the weight is equal to or greater than the upper limit value H of the allowable weight range plus the absolute value equivalent of the difference between the target weight T and the upper limit value H (ie, the weight equal to or greater than the target weight T plus two times the absolute value). It is.

  The light weight is a weight sufficiently smaller than the lower limit L of the allowable weight range of the bag pack K around the target weight T of the bag pack K. As will be understood, the weight is equal to or less than the weight obtained by subtracting the absolute value equivalent of the difference between the target weight T and the lower limit L from the lower limit value L of the allowable weight range (that is, less than the weight obtained by subtracting twice the absolute value from the target weight T). ).

  Thus, after the weight of the dummy combination weighing article is weighed by the weight checker 4, the CPU 9 starts obtaining the check weight diagnosis value, so that the CPU 9 obtains the check weight diagnosis value without mistaking the start of measurement. Can be performed.

  Similarly, after the dummy combination weighing article is discharged to the outside, the CPU 6 starts acquiring the combination weight diagnostic value, so that the CPU 6 executes the acquisition of the combination weight diagnostic value without mistakenly starting the measurement. Can do.

  Next, details of the operation of the weighing head abnormality diagnosis mode in the weighing system 100 will be described based on the flowcharts shown in FIGS. 3 and 4.

  FIG. 3 is a flowchart showing the operation of the main processing routine and the weighing operation of the combined weight diagnosis value by the weighing system, and FIG. 4 is a flowchart showing the weighing operation and the abnormality diagnosis operation of the check weight diagnosis value by the weighing system. is there. These operations are automatically task-processed by an OS (Operating System).

  When the operation start switch of the operation display unit 12 (or operation display unit 13) shown in FIG. 1 is pressed, a plurality of measurement menus are displayed on the display screen, and a specific measurement is performed by an appropriate operation on the operation display unit 13. It becomes possible to start the weighing head abnormality diagnosis mode for the head.

For example, after the maintenance work such as replacement or cleaning of the weighing hopper _{H 1, H 2 ··· H n} , the operator, by selecting the abnormality diagnosis mode for metering head _{KH 1, KH 2 ··· KH n} , after the CPU6 to control the metering head _{KH 1, KH 2 ··· KH n} , which was selected a specific metering head (diagnosed) from among a plurality of weighing heads _{KH 1, KH 2 ··· KH n} , this particular The packaged pack K combined by the diagnostic weighing head group including the weighing heads is discharged from the combination weighing device 1.

  When executing this mode as shown below, instructions of various input procedures performed by the operator are displayed as messages on the display screen. In addition, the abnormality diagnosis program is read from the storage unit 10 (or storage unit 7) into the CPU 9 (or CPU 6), and this program is executed by the CPU 9 (or CPU 6). It is executed with control.

Of course, it is possible to cause the CPU 6 that controls the weighing heads KH ₁ , KH _2, ... KH _n to process all of the series of operations in the weighing head abnormality diagnosis mode. It is possible to cause the CPU 9 to be controlled to perform processing, and it is also possible to appropriately distribute these operations to both the CPU 6 and the CPU 9.

  First, the operation of the main processing routine and the weighing operation of the combined weight diagnostic value by the weighing system shown in FIG. 3 will be described.

  First, it is determined whether or not it is time to execute combination weighing by the combination weighing device 1 (step S301). Once the combination weighing execution timing is entered (Yes in step S301), this state is maintained until the normal combination weighing operation (the operation shown in step S316) is executed. If it does, it will remove | deviate from the execution timing of combination measurement (step S301 will be in No state).

  Here, if it is out of the execution timing of the combination weighing (No in step S301), the weighing system 100 maintains the standby state until the execution timing of the combination weighing is entered without performing the combination weighing by the combination weighing device 1. To do.

  On the other hand, if the execution timing of combination weighing is entered (Yes in step S301), it is determined whether or not a start request to the weighing head abnormality diagnosis mode has been received (step S302). The start request to the weighing head abnormality diagnosis mode may be based on an operator's input operation or may be automatically generated on the system side every predetermined time.

  If there is no request for starting the weighing head abnormality diagnosis mode (No in step S302), it is subsequently determined whether or not the diagnosis mode flag is set (ON) (step S306), but the diagnosis mode flag is still set at this stage. If not (No in step S306), the weighing system 100 performs a normal combination weighing operation (step S316), and then returns to the step of determining the execution timing of the combination weighing (step S301).

  On the other hand, if there is a request to start the weighing head abnormality diagnosis mode (Yes in step S302), one light weight or overweight dummy bag packed pack is discharged by the combination weighing device 1 (step S303).

  Subsequently, the diagnosis mode flag is set (step S304), the head check memory is set to zero (cleared), and the measurement head abnormality diagnosis mode start request is canceled (cleared) (step S305).

  Thereafter, the weighing system 100 returns to the step of determining the execution timing of the combination weighing (step S301). However, since the state that has entered the execution timing of the combination weighing is maintained, the weighing head abnormality diagnosis mode in the step S302 is maintained. Proceed to the step of determining whether or not there is a start request.

  Here, since the start request for the weighing head abnormality diagnosis mode is cleared, the weighing system 100 proceeds to the step of determining whether or not the diagnosis mode flag is set, which is shown in step S306. Then, since the diagnostic mode flag is set in step S304, the weighing system 100 proceeds to a step of determining whether or not the No1 weighing head check completion flag is set (step S307).

At this stage, the No. 1 weighing head check completion flag is not set, and the weighing system 100 proceeds to the step of discharging the package pack K by the No. 1 weighing head priority combination shown in Step S308, and the weighing system 100 moves to the specific weighing head. The first weighing head KH ₁ is selected, and the packaged pack K (first) combined by the diagnostic weighing head group including the weighing head KH ₁ is discharged (step S308).

The metering system 100, while obtaining the sum of the weight of the metered articles by diagnostic metering head group including a metering head KH ₁ as combination weight diagnostic value A1, as shown in FIG. 2, the combination weight diagnostic value A1 Is written in the first row of the memory block (1) of the head check memory (step S309).

  Subsequently, after adding 1 to the number of abnormality diagnosis (initial value is zero) (step S310), the number of abnormality diagnosis is assumed to be a predetermined numerical value N (the total number of abnormality diagnosis in FIG. , N will be described on the assumption that N = 10.) (Step S311).

  Since the value of the number of abnormality diagnosis is 1, this value is not equal to the numerical value N (10) (No in step S311), and the weighing system 100 returns to the step of determining the execution timing of the combination weighing (step S301). . And after passing each determination step shown to step S301, step S302, step S306, and step S307 by the determination similar to what was already demonstrated, the discharge | emission step of the packaging pack K by No1 measuring head priority combination of step S308 To.

Here, the weighing system 100 again selects the _first weighing head KH ₁ as a specific weighing head, and combines it with the diagnostic weighing head group including the weighing head KH ₁ . th) to drain (step S308), while obtaining the sum of the weight of articles weighed by the diagnostic metering head group including the metering head KH ₁ as combination weight diagnostic value A2, as shown in FIG. 2 The combined weight diagnosis value A2 is written in the first row of the memory block (2) of the head check memory (step S309).

  Subsequently, after adding 1 to the number of abnormality diagnosis (step S310), it is determined whether or not the number of abnormality diagnosis is equal to a predetermined numerical value N (step S311).

  Since the value of the number of times of abnormality diagnosis is 2, this value is not equal to the numerical value N (10) (No in step S311), and the weighing system 100 again returns to the step of determining the execution timing of the combination weighing (step S301). Return.

  Thereafter, until the abnormality diagnosis count becomes equal to the numerical value N (10), that is, until the combination weight diagnosis values A3 to A10 are written in the first row of the memory blocks (3) to (10) of the head check memory. A similar process is executed, but the description thereof is omitted.

  When the number of abnormality diagnoses becomes equal to the numerical value N (10) (Yes in step S311), the No1 weighing head check completion flag is set, and the abnormality diagnosis number is cleared (set to zero) (step S312). ), The weighing system 100 returns to the step (step S301) of determining the presence or absence of the execution timing of the combination weighing.

  Then, in each of the determination steps shown in step S301, step S302, step S306, and step S307, in the step of determining whether or not the No1 weighing head check completion flag is set in step S307, the flag is set in step S312. Since it is set (Yes in Step S307), the weighing system 100 proceeds to a step of determining whether or not the No. 2 weighing head check completion flag is set shown in Step S313.

Here, although a detailed flow is not shown with a dotted line in FIG. 3, the weighing system 100 selects the _second weighing head KH ₂ as a specific weighing head, and this weighing head KH ₂ is selected. _The package pack K weighed in combination by the diagnostic weighing head group including ₂ is discharged, and the combined weights of the articles weighed by the diagnostic weighing head group including the weighing head KH ₂ are combined weight diagnostic values A1 to A10. As a result, the combination weight diagnostic values A1 to A10 are written in the first row of the memory blocks (1) to (10) of the head check memory. The description of the detailed operation of acquiring the combination weight diagnostic values A1 to A10 for the weighing head KH ₂ is the same as that for the _first weighing head KH ₁ already described, and is omitted. To do.)

Here, the head check memory shown in FIG. 2 is cleared after the abnormality diagnosis of the _first measuring head KH ₁ is completed and before the abnormality diagnosis of the second measuring head KH ₂ is started. The head check memory can be used for the second weighing head KH ₂ .

Thereafter, the weighing system 100 selects all the remaining weighing heads KH ₃ , KH ₄ ... KH _n as specific weighing heads (in FIG. 3, 14 are assumed as the number n of weighing heads), Although the same processing is executed, the detailed flow of these processing is attached with a dotted line, illustration is omitted, and the explanation is also omitted.

  Thus, when the No14 head check completion flag shown in step S314 is set (Yes in step S314), the diagnosis mode flag and the data processing start mode flag (described later) and the No1 to No14 weighing head check completion flag are released (OFF). (Step S315).

  Subsequently, the weighing system 100 executes a normal combination weighing operation (step S316), and the weighing system 100 returns to the combination weighing execution timing presence / absence determination step shown in step S301 to execute the next combination weighing. The standby state is maintained until the timing is entered.

  Next, the weighing operation and the abnormality diagnosis operation of the check weight diagnosis value by the weighing system shown in FIG. 4 will be described.

  First, it is determined whether or not the data processing start mode flag is set (step S401). At this stage, the data processing start mode flag is not set, and the weighing system 100 sets the diagnosis mode flag shown in step S402. It progresses to the step which determines the presence or absence of a set. The diagnostic mode flag is set in step S304 after the weighing system 100 has received the diagnostic mode start request in step S302 already described.

  If the diagnosis mode flag is not set (No in step S402), the weighing system 100 returns to the data processing start mode flag setting presence / absence determination step shown in step S401, and goes through the determination step shown in step S401. The determination operation shown in step S402 is executed again.

  On the other hand, if the diagnosis mode flag is set (Yes in step S402), it is determined whether or not the weight data of the packed pack K measured by the weight checker 4 exists (step S403).

  If there is no weight data (No in step S403), the weighing system 100 returns to the data processing start mode flag setting presence / absence determination step shown in step S401, and the determination steps shown in step S401 and step S402. Then, the determination operation shown in step S403 is performed again.

  On the other hand, if there is weight data (Yes in step S403), the weight value is read (step S404). Subsequently, it is determined whether or not the read weight value is an unexpected weight value (a weight value existing in either the excessive weight range or the light weight range) (step S405).

  If the weight value is not an unexpected weight value (No in step S405), the weighing system 100 returns to the data processing start mode flag setting presence / absence determination step shown in step S401, and steps S401 and S402. Through the determination step shown in step S403 and the weight reading step shown in step S404, the determination operation shown in step S405 is re-executed.

  On the other hand, if the weight value is an unexpected weight value (Yes in step S405), the weighing system 100 determines that the weight checker 4 has received the dummy bag pack, and the data processing start mode flag is set. (Step S406).

  Then, the weighing system 100 returns to the data processing start mode flag setting presence / absence determination step shown in step S401. Then, since the data processing start mode flag is set in step S406, the weighing system 100 proceeds to the determination step of the presence / absence of the weight data of the bag pack K measured by the weight checker 4 shown in step S407.

  If there is no weight data (No in step S407), the weighing system 100 returns to the data processing start mode flag setting presence / absence determination step shown in step S401, and goes through the determination step shown in step S401. The determination operation shown in step S407 is performed again.

  On the other hand, if the weight data is present (Yes in step S407), the weight value is read (step S408). Subsequently, the read weight value is written in the second row of the memory block (1) of the head check memory as shown in FIG. 2 as the check weight diagnosis value W1 (step S409).

  Here, every time this check weight diagnosis value is written to the head check memory, the number of times of writing corresponding to the number of times of abnormality diagnosis already described is counted (the number of times of writing is incremented by 1). It is determined whether or not N (the same numerical value as the numerical value N (10) shown in step S311) is equal (step S410).

  If the count is not equal to the predetermined numerical value N (No in step S410), the weighing system 100 returns to the data processing start mode flag setting presence / absence determination step shown in step S401, and shows in step S401. If the weight data of the succeeding bag pack K measured by the weight checker 4 in step S407 is present (Yes in step S407), the weight value is read again (step S408). As shown in FIG. 2, the weight value is written as the check weight diagnosis value W2 in the second row of the memory block (2) of the head check memory (step S409), and the number of times of writing is counted again.

  Thereafter, until the number of times of writing becomes equal to N (10), that is, until the check weight diagnostic values W3 to W10 are written in the second row of the memory blocks (3) to (10) of the head check memory. A similar process is executed, but the description thereof is omitted.

When the number of times of writing becomes equal to the numerical value N (10) (Yes in step S410), the weighing system 100 will be described with a specific weighing head (here, the first weighing head KH ₁ is assumed). Each time the combination weight diagnosis values A1 to A10 and the check weight diagnosis values W1 to W10 are read from the head check memory, the combination weight diagnosis values A1 to A10 and the check weight diagnosis are executed. An absolute value of a difference from the values W1 to W10 is calculated, and an average value of the absolute values is calculated (step S411).

  Subsequently, it is determined whether or not the average value calculated in step S411 exceeds a predetermined allowable value (step S412).

Here, unless the average value thereof exceeds the allowable value (No in step S412), the metering system 100 determines that no abnormal state with respect to this particular metering head KH _1, the following specific measuring In order to execute the same processing for the diagnostic weighing head group including the head (second weighing head KH ₂ ), the process returns to the data processing start mode presence / absence determination step shown in step S401.

On the other hand, if the average value exceeds the allowable value (No in step S412), the weighing system 100 determines that the specific weighing head is in an abnormal state, and gives a predetermined warning to the operator. Is issued (step S413). After that, the weighing system 100 performs the same processing on the diagnostic weighing head group including the next specific weighing head (second weighing head KH ₂ ), so that the data processing start mode shown in step S401 is performed. Return to the presence / absence determination step.

  According to the abnormality diagnosis operation of a specific weighing head by weighing the combination weight diagnosis value and the check weight diagnosis value described above, the specific weighing head is intentionally selected, and the diagnostic weighing including this The total weight of the articles combined by the head group is acquired as the combined weight diagnostic value and the check weight diagnostic value, and the abnormality diagnosis for a specific weighing head is quickly performed based on the method of averaging the absolute value of the difference between the two weight values. It becomes possible to do.

[Modification]
Heretofore, an example has been described in which all of the weighing heads KH ₁ , KH ₂ ... KH _n in the combination weighing device 1 are selected as specific weighing heads and an abnormality diagnosis is performed for this. For example, if the weighing head which is highly likely to be in an abnormal state by an operator can be predicted in advance, the above-described abnormality diagnosis is performed only on such a weighing head. It is also possible.

  Further, the example has been described in which the combination weight diagnostic value shown in step S309 in FIG. 3 and the check weight diagnostic value shown in step S411 in FIG. 4 are used in the weighing head abnormality diagnosis mode. For example, the control means (CPU 6 or CPU 9) can determine the presence or absence of measurement reference point fluctuation (zero fluctuation) of the weight checker 4 based on the difference between the combination weight diagnostic value and the check weight diagnostic value. It is.

  More specifically, if the sign of the numerical value obtained by subtracting the check weight diagnostic value from the combined weight diagnostic value for each diagnosis is always the same, the control means can estimate that the measurement reference point of the weight checker 4 is fluctuating. .

  The weighing system according to the present invention can quickly diagnose the presence or absence of an abnormality in the weighing head, and is useful for a weighing system including a combination weighing device including a plurality of weighing heads.

1 is a block diagram showing a system configuration of a weighing system according to an embodiment of the present invention. It is the figure which showed schematic structure of the head check memory. It is the flowchart which showed the operation | movement of the main process routine by the measurement system, and the measurement operation | movement of a combination weight diagnostic value. It is the flowchart which showed the measurement operation | movement and abnormality diagnosis operation | movement of the check weight diagnostic value by a measurement system. Taking the weight value of the packed pack on the horizontal axis and the number of packed packs on the vertical axis, the number distribution curve (thick solid line) and the desired overweight range (thin solid line) in the allowable weight range of the packed pack and desirable It is the figure which drew the lightweight weight range (thin solid line).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combination measuring device 2 Packaging apparatus 3 Conveyor 4 Weight checker 5, 8, 21, 23, 24 I / O circuit 6, 9 Control means (CPU)
7,10 storage unit 11 serial communication line 12 and 13 the operation display unit 20 inspection apparatus 22 swing type sorter 25 cartons K bagged pack P article V measuring conveyor PH photoelectric sensor H ₁ · · · H _n weighing hoppers LC ₁ ... LC _n , LCC Load cell KH ₁ ... KH _n Weighing heads A1 to A10 Combined weight diagnosis values W1 to W10 Check weight diagnosis values Z1 to Z10 Absolute value of difference n Number of weighing heads N Total number of abnormality diagnosis

Claims (8)

The measured individual weight having a plurality of weighing heads, each of which includes a weighing hopper that is divided into a plurality of articles, and a weighing sensor that measures an individual weight that is a weight of the article that is put into the weighing hopper. A combination weighing device that performs combination weighing so as to select one of the combinations within a preset allowable weight range, and discharges a combination weighing article that is an article of the combination weighing weigher to the outside;
A weight measuring means for performing a weight check by measuring a weight of the discharged combination weighing article;
Control means,
After the control unit performs the combination weighing and selects a specific weighing head from the plurality of weighing heads, the control unit performs the combination weighing so as to preferentially include the specific weighing head, and performs the combination weighing. A value is obtained as a combined weight diagnostic value, while a weight of a combination weighing article corresponding to the combined weight diagnostic value is measured by the weight measuring means to obtain a checked weight diagnostic value,
Thereafter, an abnormality diagnosis for the specific weighing head is performed based on the combination weight diagnosis value and the check weight diagnosis value ,
When the control means executes an abnormality diagnosis for the specific weighing head, the combination weighing device discharges the dummy combination weighing item to the outside, so that the combination weighing item corresponding to the combination weight diagnosis value becomes the weight. A weighing system that recognizes that it has reached a measuring means .   2. The weighing system according to claim 1, wherein when the numerical value based on a difference between the combined weight diagnostic value and the check weight diagnostic value exceeds a predetermined allowable value, the control unit diagnoses that there is an abnormality in the specific weighing head. .   The weighing system according to claim 2, wherein the weight measuring unit includes a weighing conveyor on which the combination weighing article is placed and a load cell connected to the weighing conveyor. A storage unit that stores the combination weight diagnosis value and the check weight diagnosis value in association with the number of times of abnormality diagnosis for the specific weighing head;
The weighing system according to claim 2, wherein the control unit calculates a difference between the combination weight diagnosis value and the check weight diagnosis value every time the combination weight diagnosis value and the check weight diagnosis value are read from the storage unit. The weight of the dummy combination weighing articles, the allowable weight range metering system according to claim 1, wherein a weight of less than the lower limit of the weight or the permissible weight range exceeds the upper limit. After the weight of the dummy combination weighing article is weighed by the weight measuring means, said control means measuring system of claim 1, wherein for starting the acquisition of the check weight diagnostic value. After said dummy combination weighing article is discharged to the outside, said control means measuring system of claim 1, wherein for starting the acquisition of the combination weight diagnostic value.   The weighing system according to claim 2, wherein the control unit determines whether or not the measurement reference point of the weight measuring unit is fluctuated based on the difference.

Images