JPH10307055A - Multi measurement type quantitative feed apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quantitative feed apparatus which obtains a fill amount close to a predetermined target amount by measuring the amount of a powder body remaining in a measuring tank thereby detecting a weight of the powder body adhering to the measuring tank after the powder body is discharged, correcting the weight at a final time and feeding the powdery body. SOLUTION: At a first time, a zero point of a measuring apparatus is adjusted at a step S1, an auger or the like throw-in apparatus is driven to throw into a measuring tank at steps S2-S3, the throw-in apparatus is stopped at steps S4-S5, a weight of the measuring tank is detected at steps S6-S7, a discharge gate is opened thereby discharging to a container at a step S8, a weight of a powder body adhering in the measuring tank after completely discharged is detected at steps S9-S10, the weight of the adhering powder body detected at the step S10 is subtracted from the weight detected at the step S7, thereby calculating an actual weight of the discharged powder body at a step S11. The steps S2-S11 are repeated by a predetermined number of times. At a final time, a target weight value is set at a value obtained by subtracting accumulated actual weights of the discharged powder body up to the final time from a predetermined target amount, and steps except for steps corresponding to the steps S9-S11 of the first time are carried out, whereby a fill amount close to the predetermined target amount is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to lumps, powders,
Charge the granules or liquid from the charging device into the measuring tank and weigh,
When you want to obtain more than the weighing capacity of a small weighing machine with a hopper scale, packer scale, etc., which is discharged to the lower container, multi-metering quantitative supply that repeats charging, weighing, and discharging several times until the target specified amount is reached Related to the device.

[0002]

2. Description of the Related Art Conventionally, as the simplest method of this type of apparatus, as shown in FIG. 5, when a weighing machine having a target predetermined amount of 15 kg and a weighing amount of 5 kg is used, three steps of charging, weighing and discharging are required. The measurement is repeated a number of times, but an error of a predetermined amount is added to an error for each number of times of weighing. That is, a weighing error occurs in the values of W1, W2, and W3 for each set value of 5 kg. Therefore, as shown in FIG. In addition, as shown in FIG. 6, an error generated in the first time and the second time is calculated from a target predetermined amount at the time of the third weighing to correct the input amount. The error will remain as a predetermined error. Accordingly, as shown in FIG. 6, the third target weight setting, which is the final measurement, is set to a value obtained by subtracting the first and second measurement values W1 and W2 from the target predetermined amount T. Finally, a correction by additional injection is performed. In any of these methods, the zero point of the weighing machine is adjusted each time before each injection, and then the injection, the measurement, and the discharge are repeated. Therefore, the condition is that the granules to be measured have no adhesion. That is, in the case of a powdery substance having adherence, since the powdery substance adheres in the measuring tank, the actual discharge amount each time changes by the amount of the adhered substance. There is a problem that emission cannot be obtained. In order to avoid the measurement error due to adhesion, the gross measurement method of measuring the entire container such as a bag is generally used for the measurement of the powdery material having adhesion as described above. If the target predetermined amount is increased together with the decrease in accuracy, the weighing of the weighing machine must be increased, and the problem of filling the target predetermined amount of the granular material larger than the weighing with a small weighing machine cannot be achieved. is there.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a multi-purpose multi-ply / measurement / discharge system in which the above-mentioned adhesive powders are repeatedly input, weighed, and discharged a plurality of times using a single weighing machine to obtain a predetermined amount larger than the weighing amount. By using the weighing method, the actual discharge amount excluding the powder particles attached to the measuring tank is calculated every time by the remaining amount measurement, and finally, the target weight set value is corrected based on the actual discharge amount,
It is an object of the present invention to provide a quantitative supply device capable of obtaining a filling amount close to a target predetermined amount without lowering the measuring capacity.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to a multi-metering fixed-quantity feeding apparatus, wherein a target predetermined amount is first divided into a plurality of times and a target weight is set within the weighing amount. After the zero adjustment of the weighing machine is performed, the powder in the charging hopper is driven into a weighing tank by driving a charging device such as an auger, and the weight of the weighing tank falls within the above set weight range. When it becomes, stop the charging device, wait for the weight signal to stabilize, and provide a stage to detect the weight of the weighing tank, then open the discharge gate of the weighing tank, discharge the powder and granules to the container provided below, and discharge After completion, the process proceeds to the stage of detecting the weight of the granular material attached to the measuring tank by the so-called remaining amount measuring step of detecting the weight of the measuring tank again, and then detecting the remaining amount from the previously detected weight. The actual weight discharged into the container after subtracting the weight of Calculate the amount and finish the initial weighing. From the second time onward, from the stage of charging the powder and granules by driving the charging device to the stage of calculating the actual weight discharged into the container from detecting the amount of adhesion to the measuring tank by measuring the remaining amount In the last round, the target weight set value is first set to a value obtained by subtracting the accumulated discharge weight from the previous time from the target predetermined amount, and then the remaining weight measurement and the actual weight of the discharged Each stage excluding the calculation stage is performed to obtain a filling amount in the container close to the target predetermined amount. In addition, as an additional invention, in the final measurement, the value obtained by subtracting the average value of the amount of adhered powder of each time from the remaining measurement value before the final measurement is added to the final measurement value to obtain the actual discharge amount. Thus, it is configured to obtain a filling amount in the container closer to the target predetermined amount.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention comprises a weighing tank provided with a charging device, a funnel, a discharge gate, and the like, and an instruction controller for processing a weight signal and outputting a drive signal to the charging device and the discharge gate. When using a weighing machine to fill a container provided below the weighing machine with a predetermined amount of adherent powdery material that is larger than the weighing, first set the value obtained by dividing the predetermined amount into a plurality of times within the weighing range. The target weight in the weighing is set beforehand, and the weight of the granules previously input into the measuring tank is detected and stored in the instruction controller until immediately before the final weighing, and the After discharging the powder into the container, the actual weight discharged into the container is calculated and stored each time by detecting the weight of the granular material adhering to the weighing tank, and the target weight is discharged every time from the predetermined amount in the final weighing. Set by subtracting the accumulated value of the actual weight, and weigh the weight within the set range. It was placed in the bath, it is intended to obtain a charge close to the target predetermined amount by discharging it into a container.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall configuration diagram of a multi-metering type quantitative supply apparatus according to an embodiment of the present invention. In this figure, 1
Is a charging hopper, into which the granular material 12 is injected from the charging port 2. For example, by driving the auger 3 by the motor 4, the granular material 12 is charged into the measuring tank 5 provided below the charging hopper 1. You. A discharge gate 6 is provided at a lower portion of the measuring tank 5, and is closed during the measurement by a gate driving device such as an air cylinder 7 and opened after the completion of the measurement. The weighing tank 5 is provided with a load cell 8 as weighing means, and an analog weighing signal generated from the load cell 8 is transmitted to an instruction controller 9 and processed as a weight. The instruction controller 9 has built-in target weight setting means (not shown), a comparator, a head weight setting means, and the like. When the weighing tank 5 reaches the target weight, a signal is transmitted to the motor 4 to transmit the powder The loading is stopped.
When the measurement is completed, a signal is transmitted from the instruction controller 9 to the air cylinder 7 to open the discharge gate 6, and the weighed powder 12 is transferred to the container 11 via the chute 10 provided below the weighing tank 5. Is discharged.

FIG. 2 shows a flowchart of the multi-weighing in the embodiment of the present invention. FIG. 3 is a flow chart showing a process in which the target predetermined amount is set to 15 kg,
It shows each numerical example when the above-mentioned target predetermined amount is obtained repeatedly. Therefore, the embodiments will be described with reference to these drawings in order. Here, for example, assuming that the target predetermined amount to be filled in the container 11 is 15 kg, the weighing capacity of the weighing machine is 6 kg.
It is necessary to divide the weighing into 3 times for kg. Therefore, the target weight settings t1 and tn (t2) for each time are set in advance to 5 kg as shown in FIG. Of course, the allowable range and the amount of head are taken into account in this setting. Therefore, first, in step S1, when the zero point of the weighing machine is adjusted by the load cell 8 of the weighing means and the instruction controller 9, the auger is driven in step S2, and in step S3, the powder or granular material 12 in the charging hopper 1 is driven.
Is charged into the measuring tank 5. Next, when the weight falls within the set weight range in step S4, the drive of the auger is stopped in step S5 to stop the feeding of the powder and granules, and in step S6, the measurement value W1 is waited until the measurement value stabilizes. Is detected as 5.2 kg. Then, step S8
When the discharge gate 6 is opened, the powder 12 in the measuring tank is discharged to the container 11, the discharge gate 6 is closed, and step S
After confirming the stability of the weighing value in step 9, the weighing value w1 of the granular material attached to the weighing tank is detected as 0.3 kg as shown in FIG. 3 in step S10.
By subtracting w1 from 1, the weight W1a discharged to the container 11 is calculated as 5.2 kg-0.3 kg = 4.9 kg. This completes the initial charging, weighing, and discharging.

Next, assuming that the n-th time in the flowchart is the second time, the target weight setting tn is 5 as t2 as described above.
Since the kg is set, the auger is driven in step S12, and the powder or granules 12 in the charging hopper 1 are driven in step S13.
Is again put into the measuring tank 5, and when the weight falls within the range of the set weight t2 in step S14, the drive of the auger is stopped in step S15 to stop the feeding of the powder and granules, and in step S16, the stabilization of the measured value is awaited. The measured value Wn at that time, that is, W2, is detected as 5.1 kg in step S17. So S
At 18, the discharge gate 6 is opened, and the powder 12 in the measuring tank is discharged to the container 11, and the gate is closed to execute step S19.
Then, in step S20, 0.4 kg is detected with the measured value wn of the powder or granules adhering to the measuring tank as w2 in step S20. Therefore, in step S21, the weight W2a discharged to the container 11 in the second measurement is 5.1 kg-0.4 kg =
Calculated as 4.7 kg. This completes the second charging, weighing, and discharging.

[0009] By repeating the charging, measuring, and discharging three times as described above, a target predetermined amount of 15 kg is obtained, so that the final round of the flowchart is the third round. Therefore, in this final round, the second discharge weight is calculated in step S21, and a value obtained by subtracting the first discharge amount W1a and the second discharge amount W2a from the target predetermined amount T is set as the target weight. Here, as described above, W1a and W2a are 4.9 kg and 4.7 kg, respectively, so that the set value is T− (W1a + W2a) = 15 kg− (4.9+
4.7) kg = 5.4 kg. After the target weight is set as described above, the zero point of the weighing machine is adjusted in step S31, and then the auger is driven in step S32 to drive the auger in step S32.
When the granules are put into the measuring tank at 33 and the weight falls within the above set weight range at step S34, the drive of the auger is stopped at step S35 to stop the feeding of the granules. Next, step S36
Waits for the weighing value to stabilize, and then at step S37, the weighing value W
e is detected. Now, this measured value We is 5.5k as W3.
Assuming that g is detected, the total weight of the granules discharged into the container 11 at this time is assumed to be 0 (4.9 + 4.7 + 5.5), assuming that the amount adhering to the measuring tank in the third measurement is zero.
It is calculated as kg = 15.1 kg. Therefore, the error with respect to the target predetermined amount can be the error of the last time.
That is, in the final measurement, zero point correction is performed while 0.4 kg of the last remaining amount remains on the measuring tank.
Assuming that the second deposition is 0, it is assumed that 0.4 is directly deposited on the measuring tank. In addition, if an appropriate adhesion measure is taken with respect to the adhesion of the granular material to the measuring tank, the error is minimized and high accuracy is secured. Finally, in step S38, the discharge gate 6 is opened, the powder 12 in the measuring tank 5 is discharged to the container 11, the gate 6 is closed, and a series of cycles is completed.

[0010] In the above, it was assumed that the amount of the granular material adhered to the measuring tank at the time of the final measurement was 0. However, since the amount of adhesion repeats growth and dropping, one method for correcting the amount of adhesion is, for example, as described above. In the case of weighing three times, the average value of the first and second remaining weighing values w1 and w2 from the second remaining weighing value, that is, (0.3
+0.4) kg / 2 = 0.35 kg is subtracted from the final measured value to obtain the actual discharge amount. Here, assuming that the last input weighing value is 5.5 kg, the discharge amount to the container is 5.5 kg + (0.4−0.35) kg = 5.55 kg.
Therefore, the total discharge amount of the granular material into the container is (4.9+
(4.7 + 5.55) kg = 15.15 kg.

FIG. 4A shows an embodiment in which the flow chart of FIG. 2 and the numerical example of FIG. 3 are converted into a weighing cycle pattern, and FIG. FIG.
In A, after the first and second charging, weighing, and discharging, the weight of the powder and granules adhered to the measuring tank 5 is always detected by the remaining amount measurement, and immediately after the second remaining amount measurement, the weighing machine is set to the zero point. This shows that the correction is started for the third time, that is, the last time of charging, measuring, and discharging. In addition, FIG. 4B of the conventional example shows that the zero point correction of the weighing machine is performed each time without performing the remaining amount measurement. Therefore, in the embodiment of the present invention, the zero point adjustment time for one measurement in one weighing cycle is shortened and the weighing capacity is improved as compared with the conventional example.

[0012]

According to the present invention, when it is desired to fill a container with a larger weight of a granular material by using a weighing machine with a small weight, and when batch-weighing an adhesive granular material,
Using a multi-weighing method that repeats charging, weighing, and discharging multiple times, until the final time, always measure the amount of remaining powder to detect the amount of powder particles attached after each discharge, and accumulate actual discharge from the target predetermined amount. By subtracting the amount and correcting the target set weight at the final time, the filling amount close to the target predetermined amount can be obtained with high accuracy, and at the same time, the zero adjustment time can be partially shortened. is there. In addition, a more accurate filling can be ensured by correcting the actual discharge amount by predicting the adhesion amount at the last measurement from the average value of the adhesion amount up to that time. Furthermore, there is also an effect that an initial defective product due to the powder particles adhering to the measuring tank can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a multi-measuring quantitative supply device according to an embodiment of the present invention.

FIG. 2 is a flowchart of multi-weighing in the embodiment of the present invention.

FIG. 3 is a diagram showing a numerical example when the target predetermined amount is 15 kg and the number of times of weighing is three in the embodiment of the present invention.

FIG. 4 shows a weighing cycle pattern diagram A when the number of times of weighing is set to 3 in the embodiment of the present invention and a weighing cycle pattern diagram B in a conventional example.

FIG. 5 is a flowchart when the number of times of weighing is 3 in the conventional example.

FIG. 6 is a flowchart when the number of times of weighing is set to three in another example of the related art.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 input hopper 2 input port 3 auger 4 motor 5 measuring tank 6 discharge gate 7 air cylinder 8 load cell 9 instruction controller 10 chute 11 container 12 powder

Claims (2)

[Claims] 1. A charging hopper having a charging device, a load cell, a weighing tank having a discharge gate, etc., and an instruction for processing a weight signal from the load cell and outputting a drive signal to the charging device and the discharge gate. A weighing machine provided with a controller, setting a target weight within the weighing obtained by dividing the target predetermined amount into a plurality of times, adjusting the zero point of the weighing machine, and charging the powdery material in the charging hopper by the charging device into the measuring tank. And when the weight of the measuring tank is within the set weight range, the charging device is stopped, and the step of detecting the weight is performed, and the particles in the measuring tank are discharged and filled into a lower container. After that, the first weighing is performed in a remaining amount measuring step of detecting the weight of the powder and granules attached in the measuring tank, and a step of calculating the actual discharged weight by subtracting the weight detected in the remaining amount measurement from the previously detected weight. Excluding the above zero adjustment stage Each step is repeated a predetermined number of times before the final weighing, and in the final weighing, the target weight set value is set to a value obtained by subtracting the accumulated discharge actual weight before the final weighing from the target predetermined amount, and the remaining amount of the first weighing is set. A multi-metering quantitative supply apparatus characterized in that a filling amount close to a target predetermined amount is obtained by performing each step excluding the amount measuring step. 2. In the final weighing, a value obtained by subtracting the average weight value of each remaining weighing value from the remaining weighing value before the last weighing is added to the final weighing value to obtain an actual discharge amount. The multi-metering quantitative supply device according to claim 1, characterized in that: