JPS6232326A - Fixing quantity charging device - Google Patents

Abstract

PURPOSE:To supply the goods by fixed weight with simple work by providing goods feeder which supplies an almost fixed quantity of unit goods and a means which produces a signal in proportion to the supply quantity from the goods feeder or the like. CONSTITUTION:The goods of fixed capacity are supplied in order by the goods feeders 2 and 4, the proportional signal producing means, a storage means and a comparison means. The plural goods of the respective goods of the fixed capacity which are supplied in this way are extracted and weighed by a weighing means 54. An average value of the weights of the plural goods is calculated by average value calculating means 78, 80 and 82. This average value is regarded as the real weight of the plural goods. Then, a deviation between the weight corresponding to the supply quantity determined in advance, namely, the target weight and the average value indicates the deviation between the true weight and the target weight. The arithmetic to divide a multiplication value of the deviation and a set value by the average value is performed with arithmetic means 88 and 90. This arithmetic value indicates the deviation with respect to the set value corresponding to the deviation of the weight. This variation is subtracted from the set value with a subtraction means 92 and the goods can be supplied by the fixed weight.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a quantitative filling device for filling a container with a fixed volume of an article, such as powder or granules.

<Prior Art> The quantitative filling device described above is widely used because it has the advantage of high filling speed. However, when the density of the articles stored inside the device changes, the filling speed of the container increases. Articles may have different fill weights even while maintaining a given volume.

Generally, commercial transactions for fillers are often conducted based on weight rather than volume, so it is desirable that the fill weight is constant.

For this reason, conventionally, after a container is filled with a quantitative filling device, a weighing conveyor is installed midway through the line that transports the container, and by weighing the filled material, information indicating the trend of the filled weight can be obtained. The amount of filling from a quantitative filling device has been controlled based on the information.

In addition, a scale is placed near the quantitative filling device, and a worker extracts an appropriate number of filled containers from the conveyance line, weighs the filling in each container, and then adjusts the quantitative filling device based on each weighed value. Some had manual adjustment of filling volume.

<Problems to be Solved by the Invention> However, the method using the above-mentioned weighing conveyor has the problem that the weighing conveyor is expensive and takes up a large space. In addition, although the above-mentioned problems do not occur when a worker weighs using a scale, there is a problem in that it is troublesome to weigh each time.

The object of the present invention is to provide a quantitative feeding device that solves the above two problems at the same time.

Means for Solving the Problems> The present invention, like the conventional fixed-quantity supply apparatus, comprises an article supply apparatus in which the unit supply amount of articles is almost constant, and a signal proportional to the supply amount from this article supply apparatus. When the output of the proportional signal generating means and the stored value of the storing means match, the article supplying device stops and comparison means for providing a signal.

The present invention further includes a weighing means for weighing the articles supplied from the article supplying device in a stationary state. A means for outputting a value of 0 is provided. The calculation means calculates the deviation between the weight corresponding to the predetermined supply amount and the average value. The calculation means multiplies this deviation by the set value and divides it by the average value (7), and subtracts this calculated value from the set value and stores it in the storage means.

According to the present invention, a constant volume of articles can be sequentially supplied by the article supply device, the proportioning means, the storage means, and the comparison means. A plurality of articles are extracted from the supplied fixed volume of articles and weighed by a measuring means. The average value of the weights of the plurality of articles is calculated by the average value calculation means. This average value is taken as the true weight of the multiple items. The deviation between the weight corresponding to the determined supply amount, that is, the target weight, and the average value represents the deviation between the true weight and the target weight. The calculated value is
It represents the deviation from the set value corresponding to the above-mentioned weight deviation. By subtracting this deviation from the set value, articles can be supplied at a constant weight.

<Example> This embodiment has a hopper 2 as shown in FIG.

A screw feeder number is provided in this hopper 2, and this screw feeder 4 is rotated by a motor 6. 8.10 is a pulley, 12 is a belt, 14
is an electromagnetic clutch. The volume of the article (for example, powder) supplied to the container 16 by one rotation of the screw feeder 4 is approximately constant. Screw feeder 4
On the other hand, a circular plate with a hole in only one place is provided.

Optical detectors 20 are placed opposite each other with this disk 18 in between.
a X20b is provided. This optical detector 20a
, 20b generates the number of rotations of the screw feeder 4, that is, the volume of the article supplied to the container]6 can be detected.

The pulses from the optical detectors 20a, 20b are
counter 24 through AND gate 22 as shown in the figure.
supplied to In addition, the setting pulse storage section 2 shown in FIG.
6, the number N of pulses to be formed is set by a numeric keypad (not shown) via the OR gate 2B. The number of pulses N is determined based on the article supply volume per revolution of the screw feeder 4 and the density of this article (assuming that this density remains constant). This is the number of revolutions of the screw feeder 4 necessary for feeding.

This number of rotations is determined theoretically, and in reality, it is not always possible to supply the test weight of articles into the container 16 with this number of pulses due to various factors. So, just in case,
Set the above number of pulses, perform a test run, and correct the number of pulses based on the results.

First, the correction method will be explained. Assume that the motor 6 is now rotating and the electromagnetic clutch 14 is disengaged. When the push button switch 50 is closed in this state,
The Q output of F, F (flip-flop) 32 becomes H level and energizes the driver 34- of the electromagnetic clutch 14. As a result, the electromagnetic clutch 14 is connected, the screw feeder 48 rotates, and the supply of articles to the container 16 is started. On the other hand, as the output of F-F32 becomes I (level), the OMV (one-shot multivibrator) 36 generates a pulse, and the Q output of F'-F1a becomes H.
level, the AND gate 22 is opened, and the pulses of the optical detectors 20a and 20b are counted by the counter 24.

When the count value of the counter 24 and the stored value N of the set pulse storage section 26 match, the output of the comparator 40 is ! Rubel, OM V 42 generates a pulse, F・F3
2 is reset, the driver 34 is deenergized, and the electromagnetic clutch 14 is disengaged. However, the screw feeder 4 continues to rotate due to a delay in the operation of the driver 34 and the electromagnetic clutch 14. When this rotation stops, the I of the comparator 40
(The output of timer H activated by the level output becomes H level, OMV46 generates a pulse, and F-I"3B
is reset. As a result, the count of the counter 24 is accumulated by the accumulator 4B and the counter 24 is reset.
is loaded on a scale 54 shown in FIG. 3 and weighed. This measurement signal is digitalized by an A/D converter 56.

Thereafter, this is repeated n times, and n container rollers are loaded on the scale 544.

As a result of being repeated n times, the weighing signal of the scale 54 (the weight of the articles in n containers) is written, and the accumulated value of the accumulator 48 (the optical detector 20a % 20b is generated during n feedings). pulse m
Suppose that the number) becomes M. If you operate the conversion key 5 days in this state, the audience will be W, the value Ko divided by the divider 60.
(number of pulses per Ig) is stored in the storage unit 62.

At the same time, a divider 64 divides M7 by n (n is given by the counter 50) to calculate the number of pulses per supply, and a subtracter 66 subtracts the set pulse N from this calculated value MT/n. and the deviation P (driver 34
When the screw feeder receives a stop signal due to the time delay of the electromagnetic clutch 14 and performs the actual filling operation, the setting section 70 stores the target weight Wo (which may be larger or smaller than the test weight) in the storage section 72. ), the multiplier 74 . Ko and WO are multiplied at , and P is subtracted from this multiplication value (the number of revolutions at which the screw feeder 4 is rotated to fill the target weight of the container) and the number of revolutions to fill the container, and the OR gate is The set pulse is supplied to the set pulse storage unit 26 via 28 and stored therein.

In FIG. 2, the dividers 60, 64, subtracters 66, 76, and multiplier 1 are shown to be performing calculation operations even when the conversion key 58 and setting section 70 are not operated. , the calculation operation may be performed only when the conversion key 58 or the setting section 70 is operated.

If the density of the article changes even if the weight is set, it becomes impossible to supply the article to the container 16 according to the target weight. This change in density does not occur suddenly, but gradually due to humidity, storage conditions, etc.

Therefore, the operator sometimes extracts filled containers from the conveyance line and loads them onto the scale 54. With this, the scale 5
An appropriate number of containers 1G are loaded on the scale 5.
It is assumed that the measurement signal of No. 4 becomes W,'.

In this state, when a filling correction key (not shown) is operated, -' is divided by WO by the divider 7 days, and then divided by r by the divider 82 to obtain the average weight: Wm. Subtractor 84 subtracts target weight vlO from this average weight Wm.
Find the deviation △W by subtracting . At the same time, the value PC stored in the set pulse storage section 26 and the value 100 stored in the storage section 68 are added by an adder 86 to calculate the total number of pulses. This total number of pulses is divided by the average weight Wm using the divider 8B, and 1g
The number of pulses per hit is determined to be 1, and this is stored in the storage unit 62, and at the same time, it is multiplied by ΔW in a multiplier 90 to determine the number of pulses ΔP corresponding to the deviation type amount. This ΔP is subtracted from Pc by a subtracter 92 and stored in the set pulse storage section 26.

Thereafter, the filling operation is performed in the same manner as described above.

In the above explanation, by operating the filling correction key, the divider 78.82.8B, the subtractor 84.92, and the adder 86 are
Although the buttons have been explained so that the multiplier 90 performs calculation operations, each of the above-mentioned calculation units always performs calculation operations, and only when the filling correction key is operated, the setting pulse storage section 26 and the storage section 6
2 may be stored.

In addition, in the above explanation, it is assumed that the deviation P from →Pc is constant, but if there is a high possibility that it is not constant, calculate the rotation speed each time separate filling is performed,
The average value is calculated, W('TE divided by ') is calculated and stored in the storage unit 62, and Pc is calculated from the above average value.
is subtracted, the deviation P is obtained and stored in the storage unit 68, and from now on W
Subtract P from the multiplication value of o and ′ to find Pc, and multiply ΔW and ′ to attack △P to obtain the Pc just found.
ΔP may be subtracted from the value and stored in the set pulse storage unit 26.

In the above embodiment, articles are placed on the scale 54 in order,
Although the accumulated value was obtained by leaving it on the scale, if an accumulator is provided and the accumulated value is obtained using the accumulator, there is no need to leave the article on the scale 54. Further, the number of articles placed on the scale 54 is counted by a counter, and when the count value reaches a predetermined value,
By automatically performing the above-mentioned correction calculation, the work of operating the filling correction key can be omitted.

Further, in the above explanation, a screw feeder 4 with a constant supply amount per rotation was used, but a screw feeder 4 with a constant supply amount per unit time may also be used.
The number of pulses in the above embodiments may all be used as time.

Effects> As described above, according to the present invention, articles can be fed at a constant weight by a simple operation of placing the articles on the static weighing means. Moreover, the static weighing means is less expensive and requires less installation space than a weighing conveyor.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the main parts of one embodiment of the quantitative filling device according to the present invention, Fig. 2 is a block diagram of other parts of the embodiment, and Fig. 5 is a diagram showing the mechanical configuration of the embodiment. It is. 2.4... Article supply device, 24... Proportional signal generation means, 26... Storage means, 40... Comparison means, 54.
... Measuring means, 78.80.82 ... Average value calculation means, 84 ... Deviation calculation means, 88.90 ... Calculation means, 92 ... Subtraction means. Patent applicant Yamato Seiko Co., Ltd. Agent Satoshi Shimizu and two other talented individuals

Claims (1)

[Claims] (1) A product supply device whose unit supply amount is almost constant, a means for generating a signal proportional to the supply amount of this product supply device, and a memory that stores a predetermined setting value proportional to the supply amount. means, comparing means for supplying a stop signal to the article supplying device when the output of the proportional signal generating means and the stored value of the storage means match, and weighing the article supplied from the article supplying device in a stationary state. means for calculating the average value of the weights of articles weighed multiple times by the measuring means; and means for calculating the deviation between the weight corresponding to the set value and the average value. , a quantitative determination method comprising: arithmetic means for obtaining a divided value by dividing the multiplied value of the deviation and the set value by the average value; and a subtraction means for subtracting the divided value from the set value and storing it in the storage means. filling equipment.