JPS59623A - Combinational weighing device - Google Patents

Abstract

PURPOSE:To obtain a combinational weight close to a set weight, by calculating the supply amount to an empty combinational hopper on the basis of the weights of supplied combinational hoppers, and controlling the supply amounts of feeders to the hoppers. CONSTITUTION:Lumps are supplied to respective weighing hoppers 161-16n through a suppliers 11, a circular feeder 12, feeders 131-13n, and intermediate hoppers 141-14n, and stored therein, and weighers 171-17n weigh them. Their weight signals are summed up by a total weight arithmetic circuit 41. A target total weight arithmetic circuit 47 outputs a target total weight obtained by multiplying a target weight per weighing hopper by the total number N of the weighing hoppers, and a supply arithmetic circuit 52 subtracts the total weight of weighing hoppers which are not empty from the target weight; and the result is divided by the number of empty hoppers obtained from the weight signals of the weighers 171-17n through comparators 431-43n and a subtracter 46. A feeder control circuit 55 controls the supply amounts of the feeders 131-13n to empty weighing hoppers by the output of a divider 54 so that the supply amount to the empty weighing hoppers approximates to the output weight value of the divider 54.

Description

[Detailed Description of the Invention] This invention is a method of grouping multiple items such as confectionery, fruits, vegetables, etc. whose individual weights vary (hereinafter referred to as lumps) so that the weight is approximately constant. This invention relates to a combination weighing device that is used when filling bags into bags.

Even if an attempt is made to combine a plurality of lumps, each of which varies in size, into a set dose number, an error will occur between the set dose and the set value M. This error becomes more significant as the average weight of one lump increases.

As a solution to this problem, a combination V-listen device as shown in FIG. 1 has been used.

That is, in this combination weighing device, a plurality of lumps corresponding to approximately M of the set weight are fed to the feeders 11 to 1n as J2 to each of the combination hoppers 21 to 2n. Measuring device 3 installed every 20 minutes
1 liter each of the contained lumps by 1-3 days.
l [fi-! Jru. Then, based on the output of the 61-quantity meter 31-3, the combination of the predetermined number M of the combination hoppers is used to determine the combination of the items to be delivered! Heavy lifting is excluded for all different combinations. The combination that has the smallest difference from the set weight W between the vehicles in this combination is determined, and the lumps in the M combination poppers of this combination are taken out and gathered at the group locations i to 4, etc. do.

However, in the conventional combination weighing device with such a configuration, the combination i! has a small difference from the set weight. In order to consistently obtain mold weight, the number of il Mk devices (as well as the number of combined I poppers, feeders, etc.) must be increased so that the number of combinations is large. However, scales, feeders, etc. are expensive, so if a large number of them are used, the entire device becomes extremely expensive.Moreover, the Ti scale requires constant adjustment, making maintenance complicated and reducing the reliability of the G1 position. There were disadvantages such as inferiority.

The object of the present invention is to correct the above-mentioned drawbacks and provide a combination weighing device that can always provide combinations with a small difference in weight from the set weight without increasing the number of feeders, weighing devices, etc.

For each combination, the weight of the lump housed in the small collar is set to ω
Target weight per piece W/M obtained by dividing W by the predetermined combination number M
As the weight of the lumps in the M combinations of U-poppers increases, the combined weight of the aggregates in the M combinations of U-poppers also varies greatly. That is, as shown by the symbol a in FIG.
If it is wide with M in the center, the combination t which combines M combination small brim! The width of the variation in heavy collapse is also shown in Figure 2 with the symbol @b.
It becomes wider. Therefore, in order to ensure that the combined weight is always set to 1q as a value extremely close to the set weight W,
The amount of agglomerates fed by each feeder to each combination hopper must always be very close to W/M. The sum of 1■ is the target weight per piece W
This means that if the value obtained by multiplying /M by the number N of all combined hoppers (target total weight) is obtained, a combination weight with an extremely small difference in the set Φ stones can always be obtained.

Therefore, when each group feeds lumps to the hopper by each feeder, each group replenishes the space of the contents of the fed combination hopper, and increases the amount fed to the remaining empty combination hopper from all combinations. If the total weight of the contents of the hopper is controlled to approximate the target total weight, the difference between the set Φ and the set Φ will always be extremely small. I'm happy to be able to get ff1l. Controlling the amount of supply to the remaining empty combination hoppers in this way is much easier than controlling the amount of supply to all combination hoppers so that they all become W/M.

The present invention has focused on this point, and has made it possible to always obtain a combination weight with an extremely small difference from the set weight without increasing the number of feeders, scales, etc.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 3.4 shows an embodiment of the present invention, FIG. 3 is a schematic diagram of the mechanical section of the combination 31 machine, and FIG. 4 is a schematic diagram of the control section.

In FIG. 3, 11 is a circular feeder 12 that sequentially feeds the lumps.
It is a supply device that supplies to. N intermediate hoppers 141 to 14n are arranged in a circle below the periphery of the circular feeder 12, and a plurality of lumps are supplied through the feeders 131 to 13n, respectively. Weighing droppers 16+ to 16n are installed below the intermediate hoppers 14+ to 14n, respectively. When the discharge gates 151 to 15n are opened, the lumps stored in the intermediate hoppers 141 to 14n fall and are stored in the t1 collapse hoppers 161 to 16n, respectively.

Each of the weight hoppers 161 to 16n has a weighing device 17.
1 to 17n are installed. The scales 171 to 17n weigh the plurality of lumps housed in the small flanges 16+ to 16n, respectively, and display the weight. i Output weight signal.

A collecting chute 19 is installed below the 81 quantity hoppers 161 to 16n. it I hopper 161-1
The lumps stored in 6n are each placed in a total of 1 hopper 16.
When the discharge gates 181 to 18n of + to 16n are opened, the particles fall into the collection chute 19.

A packaging machine 21 is installed below the collection chute 19. At the bottom of the collection chute 19, at regular intervals,
Alternatively, a timing hopper 20'/J is installed which opens at the same timing as the packaging machine.

The opening and closing of the discharge gates 181 to 18n are controlled by the discharge control device 33 of the combined discharge device 30.

As shown in FIG. 4, the combined V discharge device 30 includes an 81 dark value storage circuit 31, a combination selection circuit 32, and a discharge control device 33.

The intermediate quantity signals from the S1ω devices 171 to 17n are sent to the measured value storage circuit 31 of the combined discharge device 30. The 31 weight storage circuit 31 stores the weights of the objects in the 31 hanging hoppers 1 (3+ to 16n).

The combination selection circuit 32 calculates the combined weight of the lumps obtained by combining a predetermined number M of weighing hoppers based on the weight signal of the contents of each it ffi hopper 161 to 16n stored in the weighing value storage circuit 31. A combination calculation unit 32a that calculates all different combinations, and a setter m
The weight setting section 321) that sets W in the setting device 17 compares the combined weight output of the combination calculation section 32a and the set weight output of the weight setting section 32b, and selects a combination 1 of weighing hoppers that has the smallest difference from the set weight. A combination discriminating section 32c that discriminates each other and outputs a combination I selection signal is provided.

When the discharge control device 33 receives the combination V sorting signal, it listens to the designated gate among the discharge gates 18+ to 18n, and after a certain period of time, transfers the discharged items to the intermediate hopper to the measuring instrument barrel. Opening/closing control is performed to open the discharge gate.

Further, each weight signal from each weighing device 17+ to 17n is sent to a supply amount control circuit 40 for controlling the amount of feeder supply to an empty weighing hopper, as shown in FIG.

The supply amount control circuit 40 includes a total weight calculation circuit 41, an empty hopper number detection circuit 42, a target total weight calculation circuit 47, a supply monitoring circuit 52, and a feeder control device 55.

The signals from each 4m hopper 171 to 17n are input to the arithmetic circuit/11, and all ffl M hoppers 161 to 1
The mm signals for 6n are added.

Further, the mm signals from each of the measuring instruments 171 to 170 are input to comparators 43+ to 43n of the empty hopper number detection circuit 42, respectively. The comparators 43+ to 43n are the zero setter 44
Compare the weight signal and the signal indicating the weight set to zero, and if the weight according to the weight signal is greater than zero, “
1'' is output to the bit adder 45, and in the case of zero, ``0'' is output to the bit adder 45.

Bit adder 45 adds the outputs of comparators 43+ to 43n. Therefore, the output of bit adder 45 represents the number of non-empty inter-B1 bobbers.

The subtracter 46 extracts the bit adder 4 from the total combination hopper number N set in the combination U hopper number setter 51, which will be described later.
Subtract the output of 5. Therefore, the output of subtractor 46 (NL) represents the number of empty capacity hoppers.

The divider 48 of the target total weight calculation circuit 47 is connected to the weight setting section 3
The set weight W set in 2b is input to the combination number setting device 49.
is set to 1=divided by the number M of one predetermined combination. I5:
Therefore, the output W/M of the hopper remover 48 represents the target weight for each 4-hanging hopper when the set weight W is obtained by combining M small hl quantity hoppers. .

The number N of total il quantity hoppers is set and stored in the combined hopper number setting device 51. The multiplier 50 multiplies the output W/M of the divider 48 by the total combination hopper number N set in the hopper number setting device 51. Therefore, the output (W/M) of this multiplier 50 XN represents the sum of the weights of all weighing hoppers, that is, the target total weight, when the weights of the contents in all g1 quantity hoppers 161 to 16n are set to the target weight W/M. .

The subtracter 53 of the supply performance n circuit 52 subtracts the total weight of the total weight calculation circuit 41 from the target total weight of the multiplier 50.

Therefore, the output of the subtractor 53 represents the difference between the target total weight obtained by multiplying the target weight per piece by the number of weighing hoppers and the total weight of all weighing hoppers at the current stage. Divider 54
represents the number of empty hoppers from the output of the subtractor 53, and subtractor 4
Divide by the output of 6.

Upon receiving the output of the divider 54, the feeder controller 55 controls each feeder that supplies the mass to the empty weighing hopper so that the weight of the empty weighing hopper approximates the weight represented by the output of the divider. Control the supply amount.

Next, the operation of the combination weighing device according to the above embodiment will be specifically explained.

The lumps pass through the feeder 71 and the circular feeder 12, and then are sent to intermediate hoppers 14+ by feeders 131 to 13n, respectively.
~14n, and is stored in each weighing hopper 1'61-16n via intermediate hoppers 141-14n, and weighed by weighing devices 17+-17n, respectively.

Therefore, among the N total weighing hoppers 161 to 16n, one ffl fit hopper is already filled with lumps by each feeder, and the remaining (N, -1> weighing hoppers are discharged). Assuming that the tI quantity hoppers 161 to 16n are empty, the weight signals from each weighing device 17+ to 17n corresponding to each tI amount hopper 161 to 16n are sent to the comparators 431 to 43n.
, it is detected whether or not it is empty, and the attenuator 46 outputs a signal indicating the empty number (N-1>).

Further, each weight signal is enhanced by a total weight calculation circuit 41.

From the target total weight calculation circuit 47, the target weight per piece W/
The target total weight (W/M
)XN is output.

The supply m arithmetic circuit 52 subtracts the total weight of l- non-empty weighing hoppers from this target total weight, and divides it by the number of empty hoppers (N-1). Based on the output of the divider 54,
The feeder control circuit 55 adjusts the lumps of each feeder in the empty weighing hopper so that the amount fed by the feeder to the empty (N-L) hoppers approaches the weight represented by the output of the divider 54. control the amount of supply. In this way, the remaining empty t1 amount hopper is also filled with agglomerates.

When the supply to all it I hoppers 16+ to 16n is completed in this way, the combination t! The selection circuit 32 selects a predetermined combination of M shadows 1 based on the weight signals stored in the weighing value storage circuit 31 for all weighing hoppers 161 to 16n.
The combination weights of the combinations of weighing hoppers are highlighted for all different combinations U, and the combination of weighing hoppers that has the smallest difference from the set weight W set in the weight setting section 32b is selected, and a combination selection signal is sent. The discharge control device 33 opens the discharge gates of the M it lit small blobs designated by the combination I! sorting signal and discharges them into the collecting chute 19. The lumps are collected. They are grouped together in chute 19 and sent to timing hopper 2.
When 0 is heard, it falls to another device M21 and is packed in a bag.

When one round of combined U discharge is completed in this way, next,
The empty fft lfi hopper that has already been discharged receives lumps from each feeder under the control of the output of the supply amount control circuit 40, and the same operation is repeated sequentially for the combination weighing.

In this way, the amount of lumps supplied to the empty weighing hopper is always controlled so that the total weight of the contents in all weighing hoppers becomes the target total amount l, so that the amount of lumps supplied to the empty weighing hopper is When the sum of the weights of the stored items is larger than (W/M)XL, the amount supplied to the remaining (N-1) empty hoppers is each smaller than W/M, and the total weighing hopper < The total weight of the (N) stored items is controlled to be (W/M)XN. On the other hand, if it is smaller than (W/M)xL, the supply to the remaining empty small brim is controlled so that each of them is larger than W/M and the total sum is (W/M)xN. Ru. therefore,
Even if the number of gl quantity small flanges is small, the combination weight that always has an extremely small difference from the set weight will be 11 times.

In addition, in the event that a failure occurs in the weighing hopper, weighing machine, discharge gate, etc., no combination calculations will be performed on the weighing device collar, and no lumps will be supplied or discharged.
It is also possible to set a prohibition command to the combination selection circuit 32.

In addition, in the above embodiment, as a combination U hopper, fft
Although the case where the IT hoppers 161 to 16n are used has been described, as shown in FIG.
A storage hopper may also be combined. That is,
Two storage hoppers are provided for each I hopper, and the weighed lumps in the weighing hoppers 161 to 16n can be stored in any empty storage hoppers 22+ to 222n by adding discharge gates 181 to 18. So, M
The weight signals of the contents of the storage hoppers are combined by a combination U selection circuit. Then, the discharge gates of the M selected small memory bags from among the competitive games 1 to 231 to 232n are opened, and they are collected one by one at the collection gate 19.

In this case as well, the amount of supply to the empty storage hopper is
The amount of noida supplied is controlled so that it approaches the value calculated by the calculation circuit 52.

As explained above, in the combination weighing device of the present invention, the amount to be fed to the empty combination hopper is calculated based on the weight of the already supplied combination small collar, and based on this calculation result, the amount to be fed to the empty combination hopper is calculated. Since the feed rate of the feeder is controlled, the weight can always be obtained for combinations with a small difference from the set weight without increasing the number of feeders, scales, etc.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram showing a conventional combination weighing device, Figure 2
The figure shows the relationship between the variation in the weight of the items contained in the breakage popper and the variation in the combined weight. Figure 3 is a schematic configuration diagram showing the mechanism of an embodiment of the present invention. Figure 4 is the control unit. FIG. 5 is a schematic diagram showing another embodiment of the mechanism section. 11... Iha feeder, 12... Circular feeder, 131-1.3 n... Feeder, 16
1~16n...81 amount hopper, 171~17
n...Measuring instrument, 18s~182n...
Discharge gate, 19...Collection chute, 22+~
222n... Memory hopper, 23s~232o
...to υ1 output game 1, 30... combination discharge device, 31... weighing value storage circuit, 32...
... Combination selection circuit, 33 ... Emission control device, 40 ... Supply amount control circuit, 41 ...
・All type l calculation circuit, 42...Empty hopper number detection circuit, 47...Target total weight calculation circuit, 52...
. . . Supply/output calculation circuit, 55 . . . Feeder control circuit. Patent applicant: Anritsu Electric Co., Ltd. 41 Agent: Makoto Hayakawa, patent attorney Figure 1 Figure 2

Claims (1)

[Claims] A plurality of feeders that respectively feed lumps to a plurality of combination hoppers; and a plurality of fil AIs that detect the weight of the lumps fed to each combination small hopper and output a weight signal.
Container: Select the combination of the combination poppers according to the predetermined number of combinations that has the smallest difference between the sum of the weights of the lumps stored in the combination V hopper and the setting @ stone according to the weight signal, and combine them. a combination discharge device that discharges; a target weight per piece obtained by dividing the set weight by the number of pieces in the combination;
a target total weight calculation circuit that calculates a target total weight multiplied by the number of combined hoppers;
An empty hopper number detection circuit for detecting the number of empty combination hoppers behind the combination poppers: dividing the difference between the target total weight and the total weight by the number of empty hoppers to calculate the number of empty hoppers per empty hopper; and a feeder control device that controls the feeding period of the lumps by the feeder to the empty combination hopper based on the output of the feeding amount calculation circuit. A combination weighing device.