JPH10197321A - Apparatus for head correction of filling and metering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute a precise and adaptive filling correction automatically by a method wherein a computing part executes a statistical processing operation to a plurality of metered data so as to output a filling correction value. SOLUTION: A metering machine 1 meters a content, to be filled, so as to be filled into a container. An autochecker(A/C) 2 measures the weight of the container which contains the content filled by the metering machine 1. A CPU system 3 (a computing part) executes a statistical processing operation to a plurality of metered data so as to output a filling correction value. That is to say, the CPU system 3 fetches the weight value of a result measured by the A/C 2 as an input, it executes the statistical processing operation, it judges the existence of the correction amount, and it feeds back a change correction amount to the metering machine 1. Thereby, a manual operation by man power is not required, a system can be automated as a whole, and a production line can be controlled integrally as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically compensating for a drop that occurs when various powder detergents are weighed in a container.

[0002]

2. Description of the Related Art In a conventional apparatus of the same kind, when an accurate amount of powder is filled into a container in a production line for detergents or the like, a plurality of times of filling are performed. FIG. 3 is a conceptual block diagram of a correction filling device according to a conventional method. In this figure, reference numeral 1 denotes a weighing machine, which weighs contents to be filled and fills the containers.
Reference numeral 2 denotes an A / C (automatic checker) for a container containing contents filled by the weighing machine 1.
Measure the weight. Reference numeral 3 denotes a CPU system,
The weight value obtained as a result of measurement by the A / C (auto checker) 2 is input as an input, and the X (average value) and σ
(Variation). This result is periodically checked by the operator to determine whether or not the free fall amount has been changed, and the changed free fall amount is input to the weighing machine 1.

Next, a more specific description will be given with reference to FIG. Reference numeral 4 denotes a damper opening / closing motor, reference numeral 5 denotes a sector gate, and reference numeral 7 denotes a metering completion solenoid. First, starting from a state in which the sector gate 5 is closed, first, the sector gate 5 is opened to start feeding powder into the weighing hopper 12 described below. Then, the metering completion solenoid 7 is attached to the lower part thereof, and operates the rod connected to the sector gate 5 so that the sector gate 5 is operated.
Is closed, and charging of the powder is stopped. The above cycle is repeated for each of the rough filling and the correction filling. When the prescribed total filling amount is reached, the container (the following carton 1)
4) The content is dropped to end one filling / weighing operation.

[0004] Reference numeral 6 denotes a display for displaying the state of filling / weighing. Reference numeral 12 denotes a weighing hopper, which temporarily stores the powder received from the upper part in FIG. 2, and when the powder reaches a predetermined amount, the content is dropped downward by an on-off valve attached to the lower part. . Reference numeral 10 denotes a timing cam discharge motor that controls the opening and closing of the on-off valve. This is controlled by the control unit 18 described below. Reference numeral 8 denotes a weighing sensor, which measures the weight of the powder stored in the weighing hopper 12. Reference numeral 9 denotes a force balance coil, which converts the weight value into a voltage and outputs the voltage. For example, 0V if the measured weight value is 0kg, 5V if it is 5kg
The voltage value of is output. Reference numeral 13 denotes a charging hopper which guides powder falling from the weighing hopper 12. Sign 1
4 is a carton, and the powder is finally packed in this container. A control unit 18 controls the entire weighing machine.

[0005] Here, the head has the following meaning. In FIG. 4, when the content to be weighed is to be weighed by a predetermined amount, when the specified weight is reached, the sector gate 5 is closed via a rod connected to the lower end of the weighing complete solenoid 7. However, since the sector gate 5 is not closed momentarily, some contents flow out until it is closed, and the contents remain between the sector gate 5 and the weighing hopper 12 because the weighing hopper remains. Extra content will be sent to 12. This extra amount is called the head here. In order to correct the head drop amount, the sector gate 5 may be closed earlier in anticipation of the head drop amount. In order to automatically perform the operation of closing the sector gate 5 early in anticipation of this drop, conventionally, in the same type of apparatus, when filling a container with an accurate amount of powder in a manufacturing line such as a detergent, The amount of head is manually input to the CPU system 3 in FIG. 3 in advance by a human. At this time, after the filling is performed first, in the weighing machine in the filling device, the weighing data at the time of filling is input to the CPU system 3 in the device and calculated, and then the average value and the statistical variation of the amount are measured. Is calculated, and the operator of the apparatus periodically checks the calculation result, feeds back the correction amount of the filling drop to the CPU system 3 as necessary, and fills the deviation from the specified amount with the correction amount of the dropping amount. Is taken.

[0006]

In the above-described conventional apparatus, since a human manually inputs the correction amount to the filling apparatus, problems of responsiveness and correction accuracy are inevitable. There is also a problem that it is difficult to integrally manage online data exchange with devices before and after the filling device in the production line. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a correction filling device that can automatically perform accurate and responsive filling correction in a powder filling line.

[0007]

According to the first aspect of the present invention,
In a filling device that fills powder into a sequentially supplied container, a supply unit that supplies the powder, a temporary storage in which the powder supplied from the supply unit is temporarily stored, and a storage in the temporary storage A weighing unit that weighs the powder to be measured, a calculation unit that performs a statistical process on the plurality of weighing data measured by the weighing unit, and outputs a filling correction value, and a supply unit based on the filling correction value. And a control unit for automatically controlling the correction amount. According to a second aspect of the present invention, in the head correction device according to the first aspect, the arithmetic unit calculates a moving average value for the plurality of continuous weighing data, and the moving average value is predetermined. After calculating the difference between this and the target value for the amount exceeding the value range of, the difference is multiplied by a coefficient, and the sum of the result and the initial correction value is set as the above-described filling correction value. Features. Claim 3
According to the invention as set forth in claim 1,
The control unit automatically controls the supply correction amount by controlling the opening and closing of the supply gate with respect to the supply unit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for correcting and filling powder according to one embodiment of the present invention will be described below with reference to the drawings. FIG.
FIG. 3 is a conceptual block diagram of the correction filling device according to the embodiment. In this figure, the same reference numerals are given to the same components as those in the block diagram of FIG. 3 according to the conventional method described above, and the description will be simplified. That is, the weighing machine 1 and the A / C (auto checker) 2 are the same as those in FIG. Reference numeral 3 denotes a CPU system. In the present embodiment, the weight value obtained as a result of measurement by the A / C (auto checker) 2 is input as an input, and after performing statistical processing, whether or not the correction amount has been changed. And the change correction amount is fed back to the weighing machine 1. This correction filling device is a device that takes out the container to be filled from the packed box in the production line, a device that supplies this container to the filling line,
A series of manufacturing lines are configured together with equipment for packing a fixed number of filled containers.

Next, the present invention will be described with reference to FIG. In the reference numerals 4 to 14 in FIG. 2, the same reference numerals are given to the same components as those in FIG. Reference numeral 15 denotes a CPU, which performs overall control. A force balance amplifier 16 receives an output signal from the force balance coil 9. Reference numeral 17 denotes a sequencer and the CPU
In cooperation with the control unit 15, the sequence of the entire weighing machine is controlled. Here, reference numerals 4 to 7, 12 to 12 in FIG.
14 corresponds to the weighing machine 1 in FIG. 1, reference numerals 8 to 11 in FIG. 2 correspond to the A / C (auto checker) 2 in FIG.
17 respectively correspond to the CPU system 3 of FIG.

Next, the operation of the correction filling device will be described with reference to FIGS. First, at an upstream stage of the present apparatus on a production line, after an empty container is taken out of a box filled with containers to be filled, the container is transported to the present apparatus by a transport conveyor. This is Calton 1 in Figure 2.
4 corresponds to this. Thereafter, the powder is first charged into the weighing hopper 12 by the weighing machine 1 of the present apparatus. At this time, the head correction amount is performed using a value manually input to the CPU system 3 in advance by a human. The operation at this time is as follows. First, the rod at the lower portion is moved by the metering completion solenoid 7, and the sector gate 5 is opened. Then, powder is poured into the measuring hopper 12 from above.

Referring now to FIG. 2, the weighing hopper 1
The weight of the powder stored in 2 is measured by a weighing sensor 8 and when the weight reaches a specified weight, the weight is converted into a voltage value by a force balance coil 9 and output.
This output is input to the force balance amplifier 16 and also to the weighing complete solenoid 7, where the sector gate 5 is closed via the rod connected to the lower end of the weighing complete solenoid 7 and the first time. Is completed. When the powder is thus stored in the weighing hopper 12, the lower valve of the weighing hopper 12 is opened under the control of the sequencer 17, and the entire contents therein are put in the charging hopper 1.
It is dropped to the carton 14 via 3. After the above processing, the container of the filled carton 14 is transferred to the automatic checker 2 in FIG. 1 by the transfer means. The auto checker 2 weighs the carton 14. This weighing data is taken into the CPU system 3. The CPU system 3 calculates the average value: X and the variation: σ from the above measurement data and obtains the variation deviation amount according to the setting parameter, and then sends the value of the calculation result to the weighing machine 1 in FIG. Feedback. The weighing machine 1 performs the next filling according to this value. The procedure in this case is similar to the first filling case described above.

Subsequently, the change deviation amount in the above description of the operation will be described using a more specific example. A)
First, every time weighing is performed by the weighing machine, the weighing data is taken into the CPU system 3. B) A moving average value is obtained from these data. As an example, consider a case where the number of moving averages is set to three. Each time the data is weighed, the data taken into the CPU system 3 is sequentially converted to X1, X2, X
3, X4, X5, ..., and the moving average value is x1, x2, x
Assuming 3, ..., x1 to x3 are defined as follows. x1 = (X1 + X2 + X3) / 3 x2 = (X2 + X3 + X4) / 3 x3 = (X3 + X4 + X5) / 3... In other words, for continuous data, data for the number of samples defined by the number of moving averages while sequentially shifting samples to be handled one by one sequentially. And the moving average is taken.

C) Next, when the number of times continuously exceeding the width of a numerical value allowable as a predetermined deviation (referred to as dead zone width) exceeds a certain set number of times,
An error between the moving average value and the correction target value is calculated. As an example, the correction target value is 10 g, and the dead zone width is plus / minus.
It is assumed that the weight is 10 g in both minus directions. At this time, x
1 is within the dead zone width, but if it exceeds 10 g successively with x2 and x3, the error Y is calculated as follows. Y = (x2 + x3) / 2-10g D) Subsequently, the error Y obtained in the above C) is multiplied by a feedback coefficient to calculate a deviation correction amount. Here, assuming that the feedback coefficient is 0.5, the deviation correction amount Z is calculated as follows. Z = Y × 0.5 E) Finally, the deviation correction amount is added to the initial deviation amount to obtain the next correction amount. This next correction amount is fed back to the weighing machine 1. As an example, assuming that the initial deviation amount is 50 g, the next deviation amount is: R0 = 50 g + Z (first correction) R1 = R0 + Z (second correction)

Finally, Tables 1 and 2 show the results from examples using the filling device according to the invention. Here, Table 1 shows a comparison between before and after the introduction of the device, and Table 2 shows a case where only the deviation correction is performed and a case where the measurement time is optimized and the entire measurement conditions are reviewed. Are the results. It is desirable to take the weighing time as long as possible in order to suppress the variation in the amount, but this requires optimization as it affects the overall processing time. Table 1,
From Table 2, it can be clearly seen that the numerical value of each item is clearly improved.

[Table 1]

[Table 2]

[0015]

As described above, according to the correction filling device of the present invention, the following effects can be obtained. 1. Since manual operation by hand becomes unnecessary,
The entire system can be automated, and integrated management of the entire production line becomes possible. 2. By the processing centered on the CPU, it is possible to obtain an accurate and responsive correction value for the measurement data from the filling device, and thereby to provide an accurate deviation feedback. 3. Due to the above-mentioned improvement, the error in the amount of powder filling is reduced, and the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a correction filling device for powder according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an apparatus for correcting and filling powder according to an embodiment of the present invention.

FIG. 3 is a block diagram of a conventional correction filling device for powder.

FIG. 4 is a configuration diagram of a correction filling device for powder according to a conventional technique.

[Explanation of symbols]

 1: weighing machine, 2: A / C (auto checker), 3: CPU system

Continuation of the front page (72) Inventor Akinobu Aota 1-3-7 Honjo, Sumida-ku, Tokyo Inside Rion Co., Ltd. (72) Inventor Kazuyuki Naito 1-3-7 Honjo, Sumida-ku, Tokyo Lion Engineering Co., Ltd.

Claims (3)

[Claims] 1. A filling device for filling powder into a sequentially supplied container, comprising: a supply section for supplying powder; a temporary storage for temporarily storing powder supplied from the supply section; A measuring unit for measuring the powder stored in the temporary storage, a calculating unit for performing statistical processing on the plurality of measurement data measured by the measuring unit, and outputting a filling correction value; And a control unit for automatically controlling the correction amount of the supply based on the value. 2. The calculation unit calculates a moving average value for the plurality of continuous weighing data, and calculates a moving average value exceeding a predetermined value range. 2. The apparatus according to claim 1, wherein after calculating a difference between the difference and a target value, the difference is multiplied by a coefficient, and a sum of the result and an initial correction value is used as the filling correction value. 3. 3. The head correction device according to claim 1, wherein the control unit controls the opening and closing of a supply gate of the supply unit to automatically control a supply correction amount.