JPS5818611B2 - 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 weighing hopper in the middle stage, and a storage hopper in the lower stage.The material to be discharged from the storage hopper is put into the weighing hopper, the fixed amount is weighed all at once or in parts, and then The objects to be weighed and dispensed are then put into a storage hopper and are sequentially dispensed.

When measuring in one go, both the weighing hopper and the storage hopper become large, requiring a large space and increasing the cost of the system.

Moreover, when weighing many types of materials, accuracy deteriorates for small amounts of objects to be dispensed.

In addition, if a large amount of material to be dispensed is fed from the weighing hopper to the storage hopper at once, 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-quantity dispensing device that solves these problems, and one embodiment thereof will be described below with reference to the drawings.

In the drawings, reference numeral 1 denotes a storage hopper for objects to be delivered, which includes a main gate 2 for opening and closing the bottom opening, and a main gate 2 provided on the main gate 2 for storing objects to be delivered with a smaller amount than the amount delivered by the main gate 2. The main gate 2 and the partial gate 3 are each driven by drive devices 4 and 5 such as cylinders, respectively.

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 drive device 8 such as a cylinder so that the bottom portion of the weighing hopper is It has a gate 9 that opens and closes the opening.

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 delivered to a carry-out conveyor 12 by, for example, a screw feeder 11 provided below.

In the case of dispensing in n installments, the weighing hopper 6 is of a small size and has a weighing capacity approximately equivalent to l/n of the total dispensing amount.

- Let's explain this using an example where the total amount to be paid out is 500 kg and this is divided into five portions.

13 is a total payout position setting device, and 500 kg is set.

Further, 14 is a split payout position setting device, and 100 kg is set.

A divided payout setting amount of 100 ky is stored in the memory 15 based on the divided amount signal a generated by the divided payout setting device 14.

Next, partial dispensing is started, the main gate 2 of the storage hopper 1 is opened, and the objects to be disbursed are put into the weighing hopper 6.

Then, when the weighing device 7 generates a weighing signal of 100 kg (even if it is instantaneous), the matching circuit 16 detects that the weighing signal matches the divided amount signal a from the memory 18. A match signal C is generated.

This coincidence signal C is fed to the drive 4 of the main gate 2 of the storage hopper 1 to close it.

Then, after a certain period of time after the head difference has been added, the drive device 8 opens the gate 9 of the weighing hopper 6 in response to the coincidence delay signal d generated from the delay circuit 17, and the object to be dispensed is discharged into the storage hopper 10.

At the same time, the memory 18 takes in and stores the first discharge amount weighed in the weighing hopper 6 from the weighing signal generated by the weighing device 7 according to the coincidence delay signal d.
9 stores this and outputs it as a cumulative discharge signal e.

Then, the discharge completion detection circuit 20 detects that the weighing signal S becomes 0 from the finite value and generates a discharge completion signal f, and the drive device 8 closes the gate 9 of the weighing hopper 6 and delays it after a certain period of time. The drive 4 opens the main gate 2 of the storage hopper 1 due to the ejection completion delay signal g generated by the circuit 21 .

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 19 adds the second dispensing amount to the first dispensing amount previously stored by the coincidence delay signal d, The purpose is to output the total as a cumulative discharge signal e.

Therefore, the amount of discharge from the first to fourth times is, for example, 102 kg, 9
If 9 kg, 106 kg, and 104 are 9, the cumulative emission signal e is 102 + 99 + 106 + 104 = 4
11 (Achieve cumulative emissions of i < ψ.

22 is a comparator for detecting that the realized amount of the cumulative ejection signal e has become smaller than the divided dispensing set amount; the cumulative ejection signal e is added to one input, and the total dispensing position setting device 13 is added to the other input. A coarse dispensing signal i obtained by subtracting the divided dispensing signal a of the divided dispensing position setting device 14 from the total dispensing amount signal is added, and when the cumulative dispensing signal e exceeds the coarse dispensing signal i, a trigger signal j is generated.

This trigger signal j causes the memory 23 to store a remaining discharge signal k obtained by subtracting the cumulative discharge signal e from the total discharge amount signal.

In the above example, 500-411=89 remaining discharge signals k are stored.

The contents of the memory 15 storing the divided amount signal a are rewritten by this remaining discharge signal k, and subsequent measurements are performed based on this remaining discharge signal k.

Further, the remaining discharge signal is manually inputted to a 0.8 multiplication factor 24, and the 80% signal 1 corresponding to the remaining discharge amount 89×0.8=71.2□ (kψ) is input to the matching circuit 25.

On the other hand, the main gate 2 is opened again via the drive device 4 by the ejection completion delay signal g from the delay circuit 21, and the final payout is performed.

When the weighing device 7 generates a weighing signal m corresponding to 71.2 kg, the matching circuit 25 generates a precision weighing instruction signal m.
is generated, the drive device 4 closes the main gate 2, and the drive device 5 opens the partial gate 3 to perform precise metering by adding a small amount.

When the coincidence circuit 16 generates the coincidence signal C, the drive device 5 closes the partial gate 3 and completes the full payout operation.

At this time, in the final dispensing, the last 115 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.

As described above, according to the present invention, there is provided a main gate and a partial gate that precisely pays out a payout amount smaller than the payout amount by the main gate, and usually rapid payout is performed by the main gate, and even if the split payout amount is temporarily When the set amount is reached, the main gate is closed and dispensing is stopped, and the dispensing amount at that time is measured, so prompt dispensing can be carried out every time.
When the accumulated amount is subtracted from the fixed amount payout setting amount and the difference becomes smaller than the split payout setting amount, the subtraction amount is set as the final installment payout amount, and before the end of this final payout, the main gate Since it is possible to switch to precision dispensing using a partial gate, even if there is a large error in the quick dispensing up to that point, precise dispensing can be performed in the final round, and as a whole, rapid dispensing in the middle is possible. Regardless of □, it can be measured extremely accurately and has great industrial value.

[Brief explanation of drawings]

The drawing is a configuration diagram showing an embodiment of the present invention. 1... Storage hopper, 2... Main gate, 3... Partial gate, 6... Weighing hopper, 7... Weighing device, 9...Gate, 10...Storage hopper, 13...Full dispensing position setting device, 14...Division dispensing position setting device,
15...memory, 16...matching circuit,
19...Integrator, 22...Comparator, 2
3... Memory, 24... 0.8 multiplier, 25... Matching circuit.

Claims (1)

[Claims] 1. Set the main gate that dispenses the object to be weighed into the weighing hopper, the partial gate that precisely dispenses the object to be weighed with a smaller amount than the amount dispensed by the main gate, and the divided dispensing amount that divides the fixed amount into l/n. a dividing dispensing amount setting means; a gate driving means for closing the main gate and stopping dispensing when the dispensing amount to the weighing hopper temporarily matches the set amount of the dividing dispensing amount setting means; an accumulating means for accumulating the payout amount; and a means for automatically setting the subtracted amount as the final installment payout set amount when the difference obtained by subtracting the cumulative amount from the fixed fixed payout set amount becomes smaller than the split payout set amount. and a means for switching to precision dispensing using the partial gate before the final divided dispensing set amount is finished being put into the weighing hopper.