JPS6045362B2 - Fixed amount dispensing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a fixed amount dispensing device.

Generally, a quantitative dispensing device has, for example, a storage hopper in the upper stage, a measuring hopper in the middle stage, and a storage hopper in the lower stage, and the material to be discharged from the storage hopper is put into the weighing hopper and the fixed amount is weighed all at once or in parts. Next, the objects to be weighed and dispensed are put into a storage hopper and sequentially dispensed.

When weighing at one time, both the weighing hopper and the storage hopper become large, taking up a large space and increasing the cost of the system.

Moreover, when weighing many types of materials, the stacking capacity becomes poor for small amounts of objects to be dispensed. Furthermore, if a large amount of material to be dispensed is fed from the weighing hopper to the storage hopper at one time, a large storage hopper is required and the next system may be affected. Therefore, if the weight is divided and weighed, the total weighing time will be longer because it must be weighed accurately each time. The present invention proposes a fixed amount dispensing device that solves these problems.In the fixed amount dispensing device that dispenses a fixed amount n times, an accumulation means is provided for accumulating the dispensing amount each time near the set amount of divided dispensing. Means is provided for setting the divided payout set amount to 112 of the remaining discharge amount when the remaining discharge amount obtained by subtracting the cumulative payout amount of the integration means from the set payout amount reaches a value close to the set payout amount. , a means is provided for automatically setting the final remaining discharge amount obtained by subtracting the accumulated payout amount up to that point from the fixed amount payout set amount after the payout according to the 112 set amount, and the final remaining discharge amount is set as the final remaining discharge amount. This configuration is provided with means for switching so that a predetermined payout amount in the latter half of the payout based on the final divided payout set amount is performed by a minute amount payout.

This makes it possible to carry out quick divided weighing and to prevent malfunctions such as overdosing. One embodiment will be described below based on the drawings. In the drawing, reference numeral 1 denotes a storage hopper for objects to be dispensed, and a main gate 2 for opening and closing the bottom opening of the hopper; The main gate 2 and the partial gate 3 are respectively driven by driving devices 4 and 5 such as cylinders.

Reference numeral 6 denotes a weighing hopper provided below the bottom opening of the storage hopper 1, which has a weighing device 7 consisting of a load cell or the like for weighing the object to be dispensed, and is driven by a driving device 8 such as a cylinder so that the bottom opening of the storage hopper 1 is It has a gate 9 that opens and closes.

Reference numeral 10 denotes a storage hopper provided below the bottom opening of the weighing hopper 6, and the objects to be delivered are sequentially transferred to the conveyor 1 by means of, for example, a screw feeder 11 provided below.
2 will be sent out.

In the case of dispensing in n installments, the weighing hopper 6 is a small one having a weighing capacity corresponding to approximately 1/n of the total dispensing amount. The total payout amount is now 500k9, and this is 5
I will explain this using an example of paying out in installments. 13 is a total payout amount setting device, and 500 kg is set.

Further, 14 is a divided payout amount setting device, and 100k9 is set. The divided amount signal generated by the divided payout amount setter 14 is inputted to the reference terminal of the comparator 15 as the lower limit divided signal a, and the divided amount signal passed through the multiplier 16 is inputted to the comparator 15 as the upper divided signal b. It is input to the Hlgh reference terminal. If the multiplier 16 is now set to 1.3, a 130k9 signal will be input to the Hlgtl reference terminal in contrast to the 100k9 signal input to the If)W reference terminal of the comparator 15. When the signal 1 input to the input terminal indicates between 100 and 130 kg, the comparator 15
outputs trigger signal c in the first half. At the same time, the lower limit division amount signal a is input to the reference terminal of another comparator 17, and when the signal 1 input to the input terminal indicates an amount of 100 kg or less, the second half trigger signal d is output. Further, the lower limit division amount/signal a of the division payout amount setter 14 is inputted to the reference terminal of the matching circuit 19 via the a terminal of the switch Jl8, and becomes a reference signal for metering. Next, installment dispensing starts, storage hopper 1
The main gate 2 is opened, and the objects to be dispensed are thrown into the weighing hopper 6.

Then, when the measuring device 7 generates the third measuring signal e of 100k9, even if it instantaneously exceeds 100k9, the coincidence circuit 19 determines that the measuring signal e from the divided payout amount setter 14 A coincidence signal f is generated by detecting coincidence with the lower limit division amount signal a. The coincidence signal f here is supplied to the drive device 4 of the main gate 2 of the storage hopper 41 to close the main gate 2. Then, after a certain period of time after the addition of the head difference is completed, the drive device 8 opens the gate of the weighing hopper 6 in response to the coincidence delay signal g generated from the delay circuit 20, and the object to be dispensed is discharged into the storage hopper 10. At the same time, the memory 21 takes in and stores the first discharge amount weighed in the weighing hopper 6 from the weighing signal e generated by the weighing device 7 according to the coincidence delay signal g, and the integrator 22 stores this and accumulates it. Output as discharge signal h. Then, the discharge completion detection circuit 23 detects that the weighing signal e has changed from a finite value to 0, and generates a discharge completion signal 1, and when the gate 9 of the weighing hopper 6 is closed, the drive device 8 closes the gate 9 of the weighing hopper 6, and then closes the gate 9 for a certain period of time. The ejection completion delay signal j generated later from the delay circuit 24
The drive 4 opens the main gate 2 of the storage hopper 1. Then, a second payout is performed. The second dispensing operation is the same as the first dispensing operation, but the only difference is that the integrator 22 adds the previously stored first dispensing amount to the second dispensing amount using the coincidence delay signal g. Add and memorize the amount of emissions,
The purpose is to output the sum as a cumulative discharge signal h.

Therefore, the amount of emissions from the first to fourth times is, for example, 99k9, 10
If they are 2kg, 94k9 and 101kg,
Cumulative discharge signal h is 99+102+94+101=396
Achieve cumulative emissions of (K9). This cumulative discharge signal h
is subtracted from the total payout amount signal k set by the total payout amount setting unit 13 in the subtracter 25, and the remaining discharge signal 1 that realizes the remaining discharge amount is input to the input terminal of the comparator 15. In the above example, the remaining discharge signal 1 of 500-396=101 (Kg) will be input to the input terminal, and this remaining discharge signal 1 will be combined with the above divided amount signal a of 100k9 and 130k.
Since the signal is between the lower limit division amount signal b of 9, the comparator 15 generates the first half 1 to trigger signal c. This first half trigger signal c
Therefore, the first half memory 26 stores the remaining discharge signal 1 which is the output of the subtracter 25. The 112 multiplier 27 connected to the first half memory 26 generates a remaining discharge 2-divided signal m corresponding to the remaining discharge amount of the remaining discharge signal 26 divided by 1 and 2, 104×0.5=52 (K9). . At the same time, the switch 18 is switched to the b contact side by the first half trigger signal c, and the next measurement is performed based on this remaining discharge two-division signal m. On the other hand, the main gate 2 is opened again via the drive device 4 by the fourth ejection completion delay signal j of the delay circuit 24, and the first half of the final payout is performed.

Then, when the weighing device 7 generates the weighing signal e of 52k9, the coincidence circuit 19 generates the coincidence signal f to close the main gate 2 of the storage hopper 1, and the coincidence delay signal g causes the gate 9 of the weighing hopper 6 to close. is opened, and the integrator 22 integrates the discharge amount for the first half of the final round. Now, if the discharge amount is 54k9, the integrator 22 is 396+54=450(K
9), the subtracter 25 inputs the remaining discharge signal 1 of 50k9 to the input terminals of the comparators 15 and 17, and the first half trigger signal c of the comparator 15 disappears.
A second half trigger signal d of the comparator 17 is generated. This second half trigger signal d switches the switch 28 to the b contact side,
At the same time, the second half memory 29 stores the remaining discharge signal 1 of 50k9 from the subtracter 25. The stored remaining discharge signal 1 for 50kg becomes a reference input to the matching circuit 19 through the b contact of the switch 18, and subsequent weighing is performed based on this remaining discharge signal 1 for 50k9. Further, the remaining discharge signal 1 is input to the 0.8 multiplier 30, and the 80% signal n corresponding to 80% of the remaining discharge amount of 50 kg, 50×0.8=40 (K9), is the reference for the matching circuit 31. input to the terminal.
On the other hand, the main gate 2 is opened again via the drive device 4 by the ejection completion delay signal j of the delay circuit 24, and the second half of the final payout is performed.

When the weighing device 7 generates the weighing signal e corresponding to 40k9, the matching circuit 31 generates the precision weighing instruction signal p, the driving device 4 closes the main gate 2, and the driving device 5 closes the partial gate 3. It opens, switches to fine-feeding operation, and performs precision weighing. When the coincidence circuit 19 generates the coincidence signal f, the driving device 5 closes the partial gate 3 to complete the full payout operation. For dispensing in the second half of the final round, the last 1/5 of the remaining discharge amount is precisely weighed by adding a small amount, so that accurate dispensing is carried out and the overall measuring time can be shortened. In addition, when the remaining discharge amount of the final round becomes smaller than the installment payout setting amount, the first half memory 26, 1
The operation by the 12 multiplier 27 is omitted, and the operation is immediately shifted to the operation by the second half memory 29 and the 0.8 multiplier 30.

According to the present description, when the remaining discharge amount is close to not being smaller than the set split payout amount, it is possible to prevent malfunctions such as over-quantity that may occur when dispensing is performed based on the set split payout amount.

[Brief explanation of the drawing]

The drawings are configuration diagrams showing one embodiment of the present invention. 6...Measuring hopper, 7...Measuring device, 9...Gate, 10...Sump hopper, 1
3... Total payout amount setter, 4... Divisional payout amount setter, 15, 17... Comparator, 16
...1.3 Multiplier, 18, 28 ... Switch, 19 ... Matching circuit, 22 ... Multiplier, 25 ... Subtraction instrument, 26...first half memory, 27...112 multiplier, 29...
・Second half memory.

Claims (1)

[Claims] 1. In a fixed amount dispensing device that dispenses a fixed amount n times, an accumulating means is provided to accumulate the dispensing amount each time near the set dispensing amount in installments, and the remaining discharge amount is calculated by subtracting the accumulated dispensing amount of the accumulating means from the fixed dispensing set amount. A means is provided for setting the set installment payout amount to 1/2 of the remaining discharge amount when the set amount of divided payouts reaches a value close to the set amount, and after paying out the set amount by 1/2, the cumulative payout amount up to that point is set. A means is provided for automatically setting the final remaining discharge amount obtained by subtracting the fixed amount from the set fixed amount payout amount as the set installment payout amount, and the second half of the payout is set according to the final installment set amount set as the final remaining discharge amount. A quantitative dispensing device characterized by being provided with means for switching the dispensing amount so that the dispensing amount is a minute amount dispensing.