JPS60179893A - Counting device of simple substance - Google Patents

Abstract

PURPOSE:To count up the number of pieces of a simple substance rapidly and exactly even if each unit weight is changed by dividing the whole simple substance into plural times when the fixed quantity of the simple substance is supplied and stored in a case or the like, weighing the supplied process sequentially to find out the weight of every divided feeding, subtract the weight value by the average weight of the simple substance and convert the divided value into the number of pieces. CONSTITUTION:A weight detector 15 can weight the simple substance 1A correctly by using a simple substance carrying device 10 as its tare and the weight of the discharged and placed simple substance 1A is continuously inputted to a counting condition decision control circuit 22 as a weight signal WS through an input circuit 23. The circuit 22 divides the gradually increased weight of the simple substance 1A sequentially by the average weight A and converts the divided value into the number pieces of the simple substances, and when the number pieces of the simple substance on a belt reaches the allowable maximum feeding number M, closes a simple substance feed valve 4. When the weight signal WS from the weight detector 15 is stabilized, te circuit 22 finds out the exact weight value, divides the weight value by the average weight A of the simple substance inputted from the data input device 28 to find out the number N1 of feed pieces.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a counting device for accurately counting the number of parts, products, products, etc. (hereinafter simply referred to as single units) whose unit weight varies based on weight measurement.

In the production process and product distribution process in factories, etc., there are many processes that involve supplying or storing a fixed number of single items with the same shape. At this time, it is necessary to accurately count and manage the number of heavy objects supplied and stored, and conventionally, the passing of individual objects has been detected one by one using a jancer, and the number has been directly counted. However, it takes time to accurately separate each unit, it is difficult to count quickly, and the unit separation device is large and requires a lot of space, which limits the layout space. Therefore, it had some drawbacks, such as not being suitable for the actual situation.

In addition, instead of directly counting the number of units as in the past, the total weight of the supplied and stored units (for example, 1 case) is weighed all at once, and the measured value is divided by the standard weight of one unit. There are also counting devices that count the number of single pieces. However, there was a fatal drawback that the unit weight of a single item itself fluctuated, and as a result, when the number of items to be measured increased, errors would accumulate, resulting in counting errors.

This invention was made due to the circumstances mentioned above,
It is an object of the present invention to provide a unit counting device that can quickly and accurately count the number of units even if the unit weight varies.

This invention will be explained below.

The present invention relates to a unit counting device, and relates to a weighing scale that measures the weight of a plurality of units, an average weight A of each unit, 1 of each unit (maximum fluctuation range α of the weight per unit, and maximum measurement error of the scale). Enter the data input means for inputting β, the weight value from the weighing scale, and each data from the data input means, divide the weight value by the average weight A to find the number N, and
<(Al1-β)/α is satisfied, and an arithmetic processing means is provided for outputting a counting result.

First, this invention will be explained in detail.

If the average weight of each unit whose unit weight fluctuates is A, the maximum variation range of the weight per unit is 10, and the maximum measurement error of the scale that measures the unit weight is ±β, then the number of units is N. The total weight W of the single unit is within the range of W=NX(A±α)±β =NA±(Nα+β) (1) using the weight scale described above. When calculating the number of pieces by dividing the weighing value of the weighing scale by the average weight A of the unit, if the fraction of the divided value is rounded off to the nearest whole number, it is necessary to avoid the cumulative error in order to avoid counting errors. Absolute value of (Nα + β) (Nα
+β) is required to be smaller than the average weight A of the single unit. That is, Nα+β<Al1 (2),
If we transform this equation (2), we get N < (Al1-β)/α (3
). As a result, the maximum permissible supply number M of single units that does not cause a counting error becomes the largest integer value among the numerical values N that satisfy the above equation (3). This invention is based on the theoretical basis of the maximum allowable supply number M determined as described above.

In other words, in this invention, when supplying a certain number of single units and storing them in a case, etc., instead of measuring the total weight after completing the supply of the entire number of single units, all the single units are divided into multiple units. The weight is measured sequentially during the feeding process. Then, the weight of each divided supply is calculated, and this weight value is divided by the average weight A of the individual pieces to convert it into the number of pieces. In this case, if the number of units to be dividedly supplied is always managed to be within the allowable maximum supply number M, a counting error will not occur even when the number is converted from the weight. By repeating such divisional supply of single units and accumulating error-free count values, there will be no total counting error even when the entire quantity of single units is finally supplied.

FIG. 1 is a configuration diagram showing an embodiment of the present invention, in which a single unit 1 whose weight fluctuates is housed in a main hopper 2 and a small sub-hopper 3 disposed near the main hopper 2. , the single body 1 accommodated in the main hopper 2 is discharged from the discharge pipe 2A to the single body conveying device 10 via the single body supply valve 4, and the single body 1 accommodated in the sub hopper 3 is discharged from the single body conveying device 10 through the single body supply valve 4. 5, and are similarly discharged one by one from the discharge pipe 3A to the unit conveyance device 10.

The unit conveyance device 10 constitutes a conveyor with a pair of rollers 12 and 13 and a belt 11 wound around these rollers 12 and 13, and transports the units discharged and placed on the belt 11 in the storage direction Q or for collection. It is driven in direction P via a motor 14, and the weight of the unit discharged and placed on the bell) 11 of the unit transfer device 10 is the weight of the unit integrated with the unit transfer device 10. It is designed to be detected by a detector 15. In addition, a storage case RC for storing the single unit is installed in the storage section of the unit transport device 1O, and a collection hopper 6 is installed in the collection unit, and the collection hopper 6 is equipped with a storage case RC for storing the unit. The collected single pieces are collected into the main hopper 2 from a collection pipe 8 via a collection blower 7. Furthermore, the weight signal WS from the weight detector 15 is inputted to the arithmetic processing/control means 20,
Data DT input from a data input device 28 such as a keyboard is also input to the arithmetic processing/control means 20, and the motor 14 is controlled to reversibly rotate and stop by the drive signal port S output from the arithmetic processing/control means. The single supply valve 4 is controlled by the single supply signal SP, and the sub-hopper 3
The unit cutting device 5 is controlled to cut out unit #-1 units by a cutting signal CT. Further, the display signal DP from the arithmetic processing/control means 20 is transmitted to the display device 30.
The data is entered into the system so that managers, operators, etc. can confirm the unit count.

Here, the arithmetic processing/control means 20 receives the weight signal wS from the weight detector 15 and the data D from the data input device 28.
an input circuit 23 as an interface for inputting T;
A counting condition determination control circuit 22 receives a signal from this input circuit 23 to perform counting processing, and also determines and controls various conditions to be described later, and calculates the average weight from the one weight cumulative value and the corresponding counted cumulative value. A cumulative correction control circuit 24 that corrects the average weight A, a floating average correction control circuit 28 that corrects the average weight A from the weight cumulative value of a certain interval and the corresponding cumulative weight value, and a floating average correction control circuit 28 that performs the correction calculation of the maximum fluctuation width α. a correction switching circuit 25 for switching the correction processing by the counting condition judgment control circuit 22 between the cumulative correction control circuit 24 and the floating average correction control circuit 26, and the counting condition judgment control circuit 22. It consists of an output circuit 21 serving as an interface for outputting the output data to each section, and a counting condition determination control circuit 22. Cumulative correction control circuit 24. Correction switching circuit 25. The floating average correction 11J11 circuit 2B and the maximum variation range calculation circuit 27 are interconnected, and can be configured by a computer system such as a microprocessor. In addition, one display device 30 includes a divided measurement number display 33 that displays the number of divisions to be measured when dividing and weighing a single unit, and an allowable maximum supply number excess/deficiency display 31 that displays excess or deficiency with respect to the allowable maximum supply number M. ,
Cumulative measurement number display 34 that displays the cumulative value of each weighed unit
and a target measurement quantity excess/deficiency indicator 32 that displays excess or deficiency with respect to the target measurement quantity of a single unit, and each display 3
1 to 34 are made up of light emitting diodes, liquid crystals, etc.

In such a configuration, the average weight of a single unit with weight fluctuation is A, the maximum variation width of the unit is α1, the maximum weighing error of the weight detector 15 is β, and a total of two units L are accurately counted and stored. The operation when stored in the case RC will be explained with reference to the drawings in FIGS. 2 and 3 (A) to (J).

First, the single unit to be weighed is supplied to the main hopper (2 and sub-hopper 3), and the empty storage case RC is transferred to the single unit conveying device 1.
0 as shown in the figure.

Then, the data input device 28 inputs the average weight A, maximum fluctuation α, and maximum weighing error β, and also inputs the value of the target weighing number Z, and controls the counting condition judgment via the input circuit 23. input to circuit 22; The counting condition judgment control circuit 22 calculates a value determined by the formula (Al1-β)lα from the average weight A, the maximum fluctuation range α, and the maximum weighing error β, and calculates the allowable maximum supply which is the maximum integer value less than this value. The number M is determined and stored in the memory, and the input target measurement number Z is also stored in the memory.Then, the counting condition determination control circuit 22 outputs the divided measurement number display 33 and the cumulative measurement number via the output circuit 21. Clear the measured quantity display 34, set the display of the allowable maximum supply quantity excess/deficiency indicator 31 to "-M", and set the display of the target measured quantity excess/deficiency indicator 32 to "-Z°" (third (see figure (A)), 1 display 31 to 34
The symbol "-" indicates a shortage, and the symbol "+" indicates an excess, and when there is no excess or deficiency, it is indicated as "θ".

Next, the counting condition determination control circuit 22 outputs the single supply signal SP via the output circuit 21 to open the single supply valve 4,
The single unit l stored in the main hopper 2 is discharged from the pipe 2
From A, the single body is placed on the bell (11) of the single body conveying device 10 as shown in the single body IA in FIG.

In this case, the weight detector 15 is designed to be able to purely measure the weight of the unit 1^ using the unit transport device ]O as a tare, and the weight of the unit IA released and placed is the weight signal wS.
The data is continuously inputted to the counting condition determination control circuit 22 via the input circuit 23 as a signal. The counting condition judgment control circuit 22 sequentially divides the gradually increasing weight of the single IA by the average weight A to convert it into the number of single IA, and starts supplying the single IA when the number of single IA (Bell) 11 approaches the maximum allowable supply number M. Close valve 4. Then, the counting condition determination control circuit 22 detects the weight detector 1.
When the weight signal wS from No. 5 becomes stable, an accurate weight value is determined, and the number Nl to be supplied is determined by dividing by the average weight A of each unit input from the data input device 28. At this time, the display on the allowable maximum supply quantity indicator 31 is updated to "Ml-M" as shown in FIG. 3(B), and the display on the divided weighing quantity display 33 is also updated to "Nl". be done. and,
Since no counting error occurs if Nl≦X, the counting condition determination control circuit 22 outputs the drive signal DS via the output circuit 21.
is applied to the motor 14, and the bell) 11 of the single unit transport device IO is driven in the Q direction to move the single unit IA into the storage case R as shown in Fig. 2.
Release and store in C like IB. At this time, the display of the allowable maximum supply quantity excess/deficiency indicator 31 is "-M", the display of the target measurement quantity excess/deficiency indicator 32 is "Ml-Z", and the display of the divided measurement quantity display 33 is "0". ”, the display on the cumulative measurement number display 34 is updated to “N1” (see Fig. 3).
See C). In addition, if the correction switching circuit 25 specifies the floating average correction control circuit 26, the current unit weight WS is divided by the number N1 to determine the average weight A', and this value is used as the new average weight of the unit. Correct as A.

On the other hand, if N>M, there is a possibility that a counting error has occurred, so the counting condition determination control circuit 22 supplies a drive signal DS for collection to the motor 14 via the output circuit 21.
The belt 11 of the single unit conveying device 10 is driven at low speed in the P direction, and the single IA placed on the belt 11 is gradually released into the recovery hopper 6 (single IC), and the released single IC
from the recovery pipe 8 to the main hopper 2 via the recovery floor.
At the same time, the counting condition determination control circuit 22 continuously detects the gradually decreasing weight of the single IA based on the repeated signal from the weight detector 15. At this time, the weight signal group is successively divided by the average weight A to convert it into the number of individual pieces IA, and when the number of single pieces on the belt 11 becomes smaller than the allowable maximum supply side laM, the driving of the motor 14 is stopped. The counting condition determination control circuit 22 calculates an accurate weight value when the weight signal wS from the weight detector 15 becomes stable, divides the weight value by the average weight A, and calculates the number N. Display device 30 at this time
The display will be as shown in Figure 3 (D). If the number Nbi is less than the maximum allowable supply number M, the above storage operation in the storage case RC will be performed, and if the number N1 is larger than the maximum allowable supply number M. Then, the above-mentioned collection operation to the collection hopper 6 is repeated.

Furthermore, by repeating the same weighing operation for the unit 1 as described above, the unit 1 is weighed and the number of units 1 is converted. In this case, the display on the special permissible maximum supply quantity excess/deficiency indicator 31, which is characterized by the number of pieces supplied from the main hopper 2 of the single unit 1, becomes "N2-M" as shown in FIG. The display on the display 33 is updated to 'N2°'. Supply quantity N
If 2 is less than the allowable maximum supply number M, the single IA released onto the belt 11 is stored in the storage case RC by performing the same storage operation as described above. The display state of the display device 30 in this case is as shown in FIG. 3(F). In addition, if the supplied number N2 is larger than the allowable maximum supplied number M, a collection operation similar to that described above is performed to collect some of the individual IAs, and the number N2' is determined by weighing again. The state will be as shown in Figure 3 (G).

By repeating the above-mentioned collection operation several times, the cumulative measured quantity gradually approaches the target measured quantity Z. FIG. 3(H) shows a state in which the target measured quantity Z is short by Y pieces.

In this way, when the number of single pieces is insufficient with respect to the target weighing number Z by Y pieces, the counting condition determination control circuit 22 outputs a cutting signal CT to the single piece cutting device 5 via the output circuit 21. As a result, the unit cutting device 5 cuts out the units 1 one by one from the sub-hopper 3 and discharges them. Therefore, by applying the cutting signal CT to the cutting device 5 seven times, a total of Y pieces of single l are released one by one from the sub-hopper 3 through the discharge pipe 3A onto the bell) 11. . Note that since the discharge of the single body l by the single body cutting device 5 is generally much slower in supplying speed than the discharge by the single body supply valve 4, it is used only for the final adjustment of a small number of pieces. The number Y at this time satisfies Y<M, and is preferably as small as possible. To be on the safe side, a discharge number detector such as a photoelectric sensor may be provided in the discharge pipe 3A to count the number of discharged particles. In this case, the display i on the display device 30 will be as shown in FIG. The display will be as shown in Figure 3 (J).

In this way, the number of divided measurements each time is always set to the maximum allowable supply number M
Since the measurement of the unit 1 is repeated under the following conditions, the total quantity of the unit 1 can be calculated without any counting error. If the correction switching circuit 25 specifies the cumulative correction control circuit 24, the cumulative weight of the two individual pieces is divided by the number Z to find the average weight A°, and this value is corrected as the new average weight A. . In this way, the storage case RC that has accurately stored the single unit 1 by the target weighing number Z (II) is transported to the next process, and the empty storage case that has been further transported to the storage section is It is inferior to repeating the storage φ collection operation, and the storage case RC in which two individual pieces are counted and stored in sequence can be transported to the next process.

On the other hand, in order to correct the maximum variation range α of the weight of the single unit L, as shown in FIG. ) The single pieces 1 are fed one by one onto the belt 11 of the single piece conveying device 10 via the single piece cutting device 5, and the weight is measured each time one single piece is fed, and the weight is measured for each piece based on the increase in weight. The weight is calculated and the data is sequentially stored in the maximum fluctuation range calculation circuit 27. Then, from the stored multiple weighing data groups, the maximum weight 7 per single piece is calculated.
Taking 1nw and the minimum weight A & Tl, the maximum fluctuation range α゛ is α” = (＾bet - A & TI)/2 ・・・・・・・・・(
4) and correct this α' as the new maximum fluctuation width α.

Note that the weight detector 15 in the above embodiment can be configured with a load cell, a differential transformer, an encoder, etc., and the display device 30 may be replaced with a printing device, an audio output device, or other output device, or it may be replaced with a printing device, an audio output device, or other output device. A configuration in which they are juxtaposed may also be used. In addition, when the allowable maximum supply number M is exceeded, the removal of individual items may be carried out by a conveyor driven by the bell) 11 of the individual item conveying device 1O, or by a device such as a scraper, a gripper, or a vacuum suction device. The average correction may be performed for each division of the supply range, or may be performed by accumulating a certain number of measurements and sequentially erasing old data.

Further, when correcting the maximum variation range α of the unit weight, instead of supplying it from the unit cutting device 5, it may be possible to manually weigh one unit and input it from the data input device.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. i2 is a configuration diagram for explaining an example of its operation, and FIGS.
) are diagrams for explaining an example of the operation of the present invention according to a display example of a display device, and FIG. 4 is a configuration diagram showing an example of the operation of the present invention. 1, IA~IC...Single unit, 2...Main hopper, 2
A...Discharge pipe, 3...Sub hopper, 3A...
Discharge pipe, 4...Single supply valve, 5...Single cutting device, 6...Collection hopper, 7...Collection floor, 8...
・Recovery pipe, 10 single conveyance device, 11...belt,
12.13...Roller, l4...Motor, 15...
・Weight detector, 20... Arithmetic processing/control means, 21.
...Output circuit, 22...Counting condition judgment control circuit, 23
...Input circuit, 24...Cumulative correction control circuit, 25.
...Correction switching circuit, 2B...Floating average correction control circuit,
27... Maximum fluctuation range calculation circuit, 28... Data input device, 30... Display device, 31... Allowable maximum supply quantity excess/deficiency indicator, 32... Target measurement quantity excess/deficiency indicator,
33...Divided measurement number display, 34...Cumulative measurement number display.弗 4 弗 3 (A)<B)

Claims (10)

[Claims] (1) A weighing scale that measures the weight of a plurality of single units, and data for inputting the average weight A of the single units, the maximum variation range α of the weight per single unit, and the maximum weighing error β of the weighing scale. Input the weight value from the weighing scale and each data from the data input means, divide the weight value by the average weight A to find the number N, and calculate N < (A/
2-β)/α is satisfied and outputs a counting result. (2) The unit according to claim 1, wherein the arithmetic processing means has at least one of a display device, a printing device, or an audio output device, and is capable of outputting the counting results, input data, etc. Counting device. (3) Divide the plurality of units and weigh them using the weight scale, and automatically calculate the average weight A by dividing the cumulative total of each divided weight value by the cumulative total of the corresponding divided count values. A single counting device according to claim 1, which is modified to: (4) Divide the plurality of units and weigh them using the weight scale, and select the latest divided weight value and the corresponding divided weight value among each divided weight value and the divided count value corresponding to this divided weight value. The average weight A is automatically calculated by accumulating a certain number of measurements in order from numerical data to oldest data, and dividing the certain cumulative value of the divided weighing values by the constant cumulative value of the corresponding divided count values. A single counting device according to claim 1, which is modified to: (5) The arithmetic processing means has at least one of an output device such as a display device, a printing device, or an audio output device, and divides the plurality of units and weighs them with the weighing needle, and each division measurement value and the corresponding divided count values are accumulated, and a cumulative count rod, a target cumulative count value, a difference between the cumulative count value and the target cumulative count value, etc. are outputted from the output device. A single counting device according to claim 1. (6) The plurality of units are sequentially weighed one by one using the weight scale, and the maximum variation range α of the weight of the unit is automatically corrected based on each measured value obtained. A single counting device according to scope 1. (7) A main hopper that accommodates the unit, and the weight of the unit discharged from this hopper and placed on a conveyor is measured, and the placed unit is conveyed by the conveyor to a storage case or a collection hopper. A weight scale is used to transport the collection unit discharged from the collection hopper to the main ho
a data input means for inputting the average weight A of the single unit, the maximum variation range α of the weight per unit of the single unit, and the maximum weighing error β of the weighing scale; Input the weight value and each data from the data input means, divide the weight value of the placed single unit by the average weight A to find the number N, and calculate N < (Al1-β)/α
Determine the maximum permissible supply number M of the maximum integer value that satisfies
In the above case, a calculation processing/control means configured to drive the conveyor to discharge the placed single unit to the collection hopper, and each manual data from the data input means and the calculation processing / A stand-alone counting device characterized by comprising a display device for displaying the arithmetic processing results of the control means. (8) A sub-hopper for storing single bodies equipped with a single-piece cutting device whose release amount is controlled by the arithmetic processing/control means is arranged in parallel with the main hopper. Counting device. (9) The arithmetic processing/control means includes an input circuit for inputting data, a counting condition determination control circuit for performing necessary counting processing and condition determination based on the input data from the input circuit, and a cumulative total of the weight value. A cumulative correction control circuit that corrects the value, a floating average correction control circuit that corrects the average weight A, a maximum fluctuation range calculation circuit that performs correction calculation of the maximum fluctuation range α, and processing of the counting condition determination control circuit. 8. A single counting device according to claim 7, comprising an output circuit for outputting a result. (10) The @ display device includes a divided measurement number display that displays the number of divided measurements when the single unit is divided and weighed, and an allowable maximum supply number excess or deficiency that displays the excess or deficiency with respect to the allowable maximum supply number M. Claim 1, comprising: a display, a cumulative measurement number display that displays the cumulative value of the weighed units, and a target measurement number excess/deficiency indicator that displays excess or deficiency with respect to the target measurement number of the unit. A single counting device as described in item 7.