JPH029286B2 - - Google Patents

Description

[Detailed description of the invention]

This invention combines and weighs multiple types of items by type, and then distributes the value obtained by subtracting the weight value of the item that has already been weighed from the set mixed weight value according to the size of the set weight value of the item to be weighed from now on. The present invention relates to a mixing and combination weighing method for a plurality of types of items, in which a mixture having a predetermined composition ratio is taken out at a predetermined mixed weight and a predetermined number of mixed items by correcting the preset weighing value. When weighing objects to be weighed with high precision and counting accuracy, combination weighing is performed. In combination weighing, when trying to obtain an item with a set weight value, the item is weighed in small amounts with n units of weighing machines with variations, and the combination of each divided weight value or each divided weight value is calculated as a unit weight. By performing a combination calculation on the combination of each divided number of pieces divided by the value, a combination that matches the set weighing value is selected, and the set weight or set number of items is obtained by discharging the item from the weighing machine of that combination. This is what I did. The above combination weighing targets a single type of item or a mixture of multiple types of items mixed in advance at a predetermined ratio, and these items can be weighed with high accuracy. However, it is impossible to obtain a mixture composed of a plurality of types of articles in a predetermined composition ratio and with a predetermined mixed weight or a predetermined mixed number. Therefore, this invention weighs a plurality of types of items using a plurality of combination weighing devices corresponding to each type of item, and for some types of items, set weight values are determined independently and a combination calculation is performed first. In addition to obtaining a weight value that matches this set weight value, for the remaining types of items, for each combination calculation, the difference between the set mixture weight value of the mixture and the already determined weight value is calculated as the set weight value for that type of item. The set weighing value is corrected by proportionally distributing it according to the magnitude of the value, and this correction is performed in a number of ways by changing the calculation order, and each of the set weighing values after correction obtained by this is By searching for the set weight value after correction of the calculation order that takes the value closest to the set weight value, and obtaining the weight value that matches the searched set weight value after correction, the mixture can be adjusted to the predetermined composition ratio and set. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is a mixing/combining/weighing device for a plurality of types of products, which is adapted to take out products according to their mixed weight or set number of products, and embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic diagram of a mixing and combination metering device for specifically explaining the present invention. As shown in the figure, the mixing and combination weighing device can handle multiple types of items (in the example,
Multiple combination weighing devices arranged corresponding to six types of items (A, B, C, D, E, F),
c, , , feeding devices 1, 2, 3, 4, 5, 6 for supplying the respective types of articles A, B, C, D, E, F to the respective combination weighing devices, and the respective combination weighing devices that have completed weighing. It consists of a collecting and discharging device 7 that collects the types of items and discharges them to a predetermined position. Further, each of the combination weighing devices . . . is composed of n weighing machines a . . . , f . The supply devices 1, ..., 6 supply the respective types of articles A,
The supply hoppers 8, . . . 13 loaded with ..., F and the respective combination weighing devices, . It consists of a large number of electromagnetic feeders 14...,..., 19..., and the collecting and discharging device 7 includes a collecting hopper 20 provided below the weighing hopper of each weighing machine,
It consists of a timing hopper 21 which temporarily stores the mixture introduced from this outlet and introduces it into the packaging device as appropriate. In the illustrated example, each combination weighing device,...
... are arranged in a ring, but they may be arranged in a plurality of rows facing each other or in a single row, and a supply device and a collecting and discharging device may be attached accordingly. Next, the weighing method of the present invention will be explained using the mixing and combination weighing device having the above configuration. Before this, we will define counting to mean measuring the number of items and measuring the weight, and since the count value is the measured value divided by the unit weight of the item, we will explain counting and measurement together. I'll decide. Now, each combination weighing device,..., is 5 each.
The mixture will be composed of six types of items A, ..., F, and the mixture will be mixed at a set composition ratio and a set mixed weight or a set number of mixed items. We will explain the case of taking it out. First, when a plurality of types of items A, ..., F are fed into each weighing hopper of the corresponding combination weighing device, ..., in small amounts with variations through each pool hopper, and divided weighing is performed. ,
The number of combinations of divided weighing values to obtain the set weighing values for each type of item is 31 for one type of item for five weighing machines, and 186 for six types of items. If the set weight values for each type of item A, ..., F are made independent of each other, that is, if each combination weighing device is separated and independent to weigh the corresponding type of item, then each type of item is There is no problem with accuracy when taking out the set weight value, but
Each type of item A obtained in this way,...
The measurement errors of each type of item are accumulated in the mixture in which F is collected, and the measurement accuracy from the perspective of the mixture decreases. Therefore, in this invention, there are a plurality of types of items A, the items whose set weight values can be independently determined.
For example, items A and B are designated from among ..., F, and combination calculations are given priority to obtain the set weight values for these types of items A and B, respectively, and the items conform to the set weight values. Obtain each combination and its measured value. Next, in this invention, the set weight values for the other types of items C, D, E, and F that make up the mixture are set independently, but they are made dependent on the results of the weight values for the items that have already been calculated. to correct. That is, the set weight value of item C is corrected as follows. In other words, the value obtained by subtracting the above-mentioned measurement values of items A and B from the set mixed weight value is calculated for the items C, D, E, and the items to be calculated from now on.
Correction is made according to the ratio of the set weight value of item C to the total set weight value of F. Then, a combination calculation of the divided measurement values is performed for the corrected set weight value of the item C to obtain a combination and its weight value that match the corrected set weight value. Next, the set weight value of item D is determined by subtracting the weight values of items A, B, and C for which the above calculation has been completed from the set mixed weight value of the mixture, according to the ratio of the set weight value of item D as described above. Allocate and correct. Then, a combination calculation of the divided measurement values is performed for the set weight value of the item D after the correction, and a combination matching the set weight value after the correction and its weight value are obtained. Thereafter, the set weight values of the remaining items E and F are corrected in the same way to obtain combinations and their weight values that match the corrected set weight values. The number of combinations of divided weighing values up to this point is for each type of item A, B, C, D, E, and F.
There are 31 combinations for a total of 186 combinations, and it is necessary to increase the number of combinations to further improve the measurement accuracy of the mixture. Therefore, in the present invention, items A and B are given priority in the combination calculation, but the order of calculations for the remaining items C, D, E, and F is switched, for example, D→C→E→F, Or D→E
→ By changing the order of C → F, etc., each weighing machine a..., b..., c..., d..., e
To increase the number of combinations of ..., f... without increasing the number of installed units. In other words, by swapping the calculation order of each type of item, the corrected set weight value of that type of item changes.In other words, by swapping the calculation order, the number of combinations can be multiplied by 41. The total number of combinations obtained is (31×2) +
(31 x 4 x 41) = 3038 combinations, and therefore this total number of combinations is sufficient to obtain the mixture closest to the set mixing measurement value. Next, the above-mentioned measuring method will be explained with specific numerical values as follows. Now, among the set mixed weight values of the mixture, the set mixed weight value is represented by W, the set mixed number of pieces is represented by N, and the set weight values and measured values of each type of item that make up the mixture are expressed as shown in the table below. I'll decide.

[Table] Furthermore, we will express the set weight value by the set weight value, and the measured value by the measured weight value, and set weight values for all types of items W _A ,... W _F and the set number N _A , ...Set N _F equally. In the above, FIG. 2 shows a block diagram for carrying out this measurement. 22 in the figure is the arithmetic control section mentioned above, which is composed of a microcomputer, etc.
Each of the weighing machines a..., b..., c..., d..., e... of the respective combination weighing devices,...
. . , f . . . and performs arithmetic operations, and also controls the weighing operation of the mixing and combination weighing device. 23 is a multiplexer constituted by an analog switch, etc., and 24 is an A/D converter. Reference numerals 25 and 26 are a mixing weight setting section and a mixing number setting section for setting a set mixing weight value W and a set mixing number N of the mixture. 27, 28, 29, 30, 3
1 and 32 are the set weight values W _A of each type of item,
Weighing setting section for setting W _B , W _C , W _D , W _E , W _F ,
33, 34, 35, 36, 37, and 38 are unit weight setting units that set the average unit weight of each type of item;
39, 40, 41, 42, 43, and 44 are number setting sections for setting the number of items of each type. With the above configuration, each type of item A, B, C,
D, E, F are stored in supply hoppers 8, ..., 13, and a large number of electromagnetic feeders 14 ..., ..., 19
Combination weighing device corresponding to...
Each weighing machine a..., b..., c...
..., d..., e..., f... are fed into each weighing hopper via each pool hopper with small variations, and when the preparation for packaging is completed, the start signal S is calculated. It is sent to the control unit 22. The arithmetic control unit 22 receives the start signal S and sends a selection signal λ to the multiplexer 23, and first selects the item A.
The divided weight values (analog signals) of the five weighing machines a..., f... which are weighing the respective types of articles are sequentially selected, and each divided weight value is sequentially passed from the multiplexer 23. , A/D converter 24
is converted into a digital signal by the arithmetic control section 22.
At the same time, each division weight value divided by the unit weight value of each type of item is stored in each register corresponding to each weighing machine a, . . . , f, . . . Here, when a mixture is taken out with emphasis on the component weight of each type of item, that is, each set weight value W _A , ..., W _F at a set mixed weight value W (),
Constituent number of each type of item, i.e. set value
The weighing method will be explained in detail by dividing it into _{the case () where a mixture with emphasis on N A ,} . First, in the case of () above, the arithmetic control unit 22 divides the items A and B, for which the set weight values W _A and W _B can be independently determined, to obtain the set weight value W _A for item A. Combination calculations of weight values are performed with priority over other types of items C, D, E, and F, and the combinations and their combined weights are stored. Then, the combination that is equal to or closest to the set weight value W _A is selected to obtain the weighed weight value W _A '. Similarly, for item B, a combination equal to or closest to the set weight value W _B is selected to obtain the weighed weight value W _B '. Items A and B that constitute the mixture as described above
After determining the measured weight values W _A ′, W _B ′, the arithmetic and control unit 22 next performs a combination calculation of the divided weight values of each weighing machine C . . . that weighs the article C. Then, from the set weight value W of the mixture, both of the above measured weight values are calculated.
The value after subtracting W _A ′ and W _B ′ is calculated as the remaining items C, D,
The set weight value W _C of item C is corrected by distributing it according to the ratio of the constituent weights of E and F, and the corrected set weight value W _C1
Select the combination that is equal to or closest to , and obtain the weighed weight value W _C '. The formula for how to correct the set weight value W _C is as follows:
As mentioned above, if the set weight value W _A = W _B ... = W _F , the set weight value after correction W _C1 =
It is expressed as W-(W _A ′+W _B ′)/4. Next, the calculation control unit 22 subtracts the measured weight values W _A ′, W _B ′ and the measured weight value W _C1 ′ of the item C, which has already been calculated, from the set weight value W of the mixture.
Allocate the remaining items D, E, and F according to the ratio of their constituent weights, correct the set weight value W _D of item D, and select the combination that is equal to or closest to the corrected set weight value W _D1 . Obtain the measured weight value W _D ′. The set weight value W _D1 ′ after correction is expressed as W _D1 ={W−(W _A ′+W _B ′+W _C ′)}/3. Similarly, the arithmetic control unit 22 calculates W _E1 ={W−
(W _A ′+W _B ′+W _C ′+W _D ′)}/2 and W _E1 = {W−
(W _A ′+W _B ′+W _C ′+W _D ′+W _E ′)}/1 Select a combination that matches the corrected set weight values W _E1 , W _F1 and calculate the weighed weight values W _E ′, W _F ′ is obtained. As a result of the above, each constituent weight has a measured weight value.
Set a mixture composed of multiple types of items A, _B , _C , _D , E, and F, which are W A ′, W B ′, W _C ′, W D ′, W _E ′, and W _F ′. The mixed weight value W can be obtained. However, under the condition that the set mixed weight value W is satisfied, the set weight value after correction for each type of product
In order for the four parties W _C1 , W _D1 , W _E1 , and W _F1 to simultaneously obtain the values closest to the set weight values W _C , W _D , W _E , and W _F , in other words, to further improve the weighing accuracy of the product C ，
Replace the calculation order of D, E, F and set weight W _C ,
Correction is performed in a number of ways based on W _D , W _E , and W _F . There are 41 corrected set weight values that can be obtained by this, which is 24 different values, and when expressed along with the calculation order, they are W _C1 , W _C2 ...W _C24 , W _D1 , W _D2 , respectively.
...W _D24 , W _E1 , W _E2 , ...W _E24 , W _F1 , W _F2 ...
…Represented by W _F24 . Then, among these, the set weight value after correction of the X-th calculation order that can obtain the value closest to the set weight value (the one that requires the least correction)
Search W _CX , W _DX , W _EX , W _FX . Next, the searched corrected set weight values W _CX , W _DX , W _EX , W _FX
Combinations that are compatible with each type of item C, D,
Select from among 31 combinations of E and F divided measurement values. After that, the arithmetic control unit 22 sends a discharge signal ω to the weighing hopper of each weighing machine a..., b... corresponding to the combination that matches the independently determined set weight values W _A and W _B.
and discharges the items A and B with the measured weight values W _a ′ and W _b ′ to the collection hopper 20, and the arithmetic control unit 22 outputs the corrected set weight values W _CX and W retrieved as described above. Each weighing machine corresponding to the combination suitable for _DX , W _EX , W _FX c..., d..., e..., f
It also sends _a discharge signal _{to the} weighing hopper _of .
By discharging F to the collecting hopper 20, the mixture can be taken out at a set composition weight ratio and at a set mixing weight. Next, we will specifically explain the weighing method () when taking out a mixture with a set number N of mixed items with emphasis on the composition number ratio of each type of item, that is, the set number N _A , . . _. , NF. In this case, as in the case of () above, the arithmetic control unit 22 gives priority to the calculations for items A and _B whose set numbers N _A and N B can be determined independently, and performs the calculations for each item A and B. Memorize the combination and number of combinations. Then, the combination closest to the set weight values W _A and W _B is selected from among the combinations that are equal to the set numbers N _A and N _B , respectively. Or, if there is no combination equal to the respective set numbers N _A and N _B , the set numbers N _A and N _B
Set weight value among combinations with one more piece than
Select the combination that is closest to the weight of W _A and W _B plus their respective unit weights. Items A and B that constitute the mixture as described above
Once the numbers N _A ′ and N _B ′ to be measured have been determined, the calculation control section 22 performs calculations for other types of items C, D, E, and F. In this calculation, as in the case of (), the value obtained by subtracting the number of items to be weighed that has already been determined by the combination calculation from the set number N of the mixture is calculated as the size of the set number of items for which the combination calculation has not yet been performed. Allocate accordingly and correct the set number. Expressing this in a formula, if N _C = N _D = N _E = N _F ,
Setting number after correction N _C1 = {N-(N _A ′+N _B ′)}/4 N _D1 = {N-(N _A ′+N _B ′+N _C ′)}/3 N _E1 = {N-(N _A ′+N _B ′+N _C ′+N _D ′)}/2 N _F1 = {N −(N _A ′+N _B ′+N _C ′+N _D ′+N _E ′)}/1. Furthermore, the calculation control unit 22 controls the items C, D, E,
If the calculation order of F is changed and the set number is corrected for each calculation order, and the corrected set number obtained by this is expressed with a subscript, N _C1 , N _C2 , ..., N _C24 , N _D1 , N _D2 , ..., N _D24 N _E1 , N _E2 , ..., N _E24 , N _F1 , N _F2 ..., N _F24 , and there are 24 types for each operation order. And among these, each set number N _C ,
N _CX , N _DX , N _EX of the X-th calculation order that has been corrected to be the most equal to all four of N _D , N _E , N _F ,
N _FX is searched, and a combination matching this is selected from among the combinations of divided measurement values of each type of item C, D, E, and F. In addition, when selecting a combination that matches the set number of items after correction, select the combination that is closest to the set weight W _C , W _D , W _E , W _F of each type of item C, D, E, F. , and if there is no combination that matches the set number of items after correction, select the combination that is closest to the set weight of that type of item plus the unit weight from among the combinations with one more item than this. do. After that, each weighing machine a..., b..., c..., d corresponds to each combination selected as above.
The discharge signal ω is sent to the weighing hopper of ......, e..., f..., and the number of components is N _A ′, N _B ′, N _C ′, N _D ′,
Multiple types of items A, B, C, which are N _E ′, N _F ′,
A mixture constituted by D, E, and F can be taken out with a preset mixed number N and a value close to the preset mixed weight value W. In addition, in the example, the set weight value W _A = W _B ... = W _F
The set number N _A = N _B =... = N _F , and therefore the unit weight of each item is also the same. However, the unit weight of each type of item is different, and the set weight of each item is the same. Even if the value and number of settings are different,
By performing the above-mentioned distribution by correcting each set weight value and set number of pieces according to the difference, the mixture can be taken out at an arbitrary constituent weight ratio or constituent number ratio, and at a set mixed weight or set mixed number. In addition, in the example, there are two types of items for which combination calculations can be performed with priority over other types of items, that is, items for which set weight values can be set independently, but there may be one or three or more types of items. Alternatively, it may be eliminated altogether and the measurement may be performed based only on the corrected set measurement value. As explained above, the present invention weighs a plurality of types of items using a plurality of combination weighing devices corresponding to each type of item, and for some types of items, set weight values are determined independently and the set weight values are determined first and then combined. Perform calculations to obtain a weight value that matches this set weight value, and
For the remaining types of products, for each combination calculation, the difference between the set mixing measurement value of the mixture and the already determined measurement value is proportionally distributed according to the size of the set measurement value of that type of product, and the set measurement value is calculated. The value is corrected, and this correction is performed in a number of ways by changing the calculation order, and each calculation order that takes the value closest to each set measurement value among the corrected set weight values obtained thereby. A mixed weighing method for multiple types of items that searches for corrected set weight values and obtains weight values that match the searched corrected set weight values. The mixture can be taken out with high measurement accuracy at a set component weight ratio or a set component number ratio, and also at a set mixed weight or a set mixed number. Furthermore, since the number of combinations is increased by changing the order of calculation of combinations between the respective types of items, the number of weighing machines to be installed can be reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the mixing and combination weighing device according to the present invention, and FIG. 2 is a block diagram for explaining the weighing method of the present invention. A, B, C, D, E, F...Multiple types of items, ,,,,...Multiple combination weighing devices.

Claims (1)

[Claims] 1. Using a combination weighing device consisting of n weighing machines, weighing an item in small amounts with each weighing machine in small amounts, and performing a combination calculation on the combination of each divided weighing value. In the combination weighing method, a combination that matches the set weight value is selected by the method, and the items are discharged from the weighing machines of that combination. Different types of items are weighed separately with each weighing machine of the combination weighing device corresponding to each type of item, and set weight values are determined independently for some types of items and combined with priority given to other types of items. Calculation is performed to obtain a weight value that conforms to the set weight value above, and for the remaining types of items for which the combination calculation has not been performed, the set mixture weight value of the mixture has already been determined for each combination calculation. The difference from the measured value of other items is distributed according to the size of the set weight value of that type of item, and the set weight value is corrected to obtain a weight value that matches the set weight value after correction. A mixed combination weighing method for multiple types of items. 2 Using a combination weighing device consisting of n weighing machines, each weighing machine divides the product into small amounts with variations, and performs a combination calculation on the combination of each divided weighing value to match the set weight value. In a combination weighing method, a combination of items is selected and the items are discharged from the weighing machines of that combination. For each type of item, set weight values are determined independently, and combination calculations are performed with priority over other types of items to obtain weight values that match the set weight values above, and combination calculations are performed. For the remaining types of items that have not yet been determined, for each combination calculation, the difference between the set mixture weight value of the mixture and the weight value of the other item that has already been determined is calculated as the size of the set weight value of that type of item. Allocate accordingly and correct the set measurement value,
Furthermore, this correction is performed in a number of ways by changing the calculation order among the remaining types of items for which the combination calculation has not been performed, and the set weight of each of the corrected set weight values obtained by this is Mixing of multiple types of items characterized in that a set weight value after correction of the calculation order that takes the value closest to the value is searched, and a weight value matching the searched set weight value after correction is obtained. Combination weighing method.