JPS6238321A - Constant weight feed device - Google Patents

Abstract

PURPOSE:To feed a predetermined constant by deciding a storage tank on which a weighing means is mounted and performing control according to the decision result. CONSTITUTION:For example, when the storage tank and a supply feeder 12a are mounted on a load cell 10, a gate circuit 18 supplies a constant from a constant setter 16a to a quantitative control part 14 with a signal from a discrimination sensor 30, a gate circuit 22 supplies a driving signal from a feeder controller 20a to the supply feeder, and a gate circuit 28 supplies an upper and a lower limit level from an upper and lower level setter 26a to a comparing part 24. When the storage tank and supply feeder mounted on the load cell 10 is replaced with 12b, the gate circuit 18 supplies the constant from the constant setter 16b to the quantitative control part 14 with the signal from the discrimination sensor 30, the gate circuit 22 sends the driving signal from a feeder controller 20b to the supply feeder, and the gate circuit 28 supplies the upper and lower limit levels from an upper and lower level setter 26b to the comparing part 24. Consequently, the operation efficiency of the device is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a constant weight feeding device for feeding articles of constant weight.

<Prior art> Conventionally, a device using the above-mentioned constant weight feeding device has a third
As shown in the figure, there is a constant ratio mixing device that mixes a plurality of articles at a constant weight ratio. This supplies a predetermined weight of articles to the mixing device 8 from constant weight feeders 2.4.6, each containing a different article. In addition, 2a, 4a.

6a is a control device for each constant weight feeding device 2.4.6. Each constant weight feeding device 2.4.6 includes, for example, a storage tank, a measuring device installed in the storage tank, a feeder for cutting articles from the storage tank, a measuring signal from the measuring device, a set value, etc. The feeder is controlled based on the constant of , and articles of a weight determined for each constant weight feeding device are fed to the mixing device 8.

<Problems to be Solved by the Invention> However, in the above-mentioned constant rate mixing apparatus, the number of raw materials may be very large in the production of a wide variety of products in small quantities.

In such a case, when changing the raw material, the previous raw material may remain in the storage tank and mix with the new raw material, so there is a problem that the inside of the storage tank must be thoroughly cleaned. In order to solve this problem, it is conceivable to make the storage tank and feeder separable from the measuring device, and to replace the storage tank and feeder together when changing the raw material.

However, if the properties of the previous product and the current product are significantly different, it is necessary to use a feeder that matches the properties, but the constants used for control must be changed depending on the feeder, and test runs are performed to determine the constants. There was a problem in that the decision had to be made and it was troublesome.

<Means for solving the problem> A means for solving the above problem has a plurality of storage tanks corresponding to a plurality of different types. Each of these storage tanks is provided with a supply device for supplying articles from inside the storage tank. This feeding device is adapted to the nature of the articles in the provided storage tank. Each storage tank is removably provided with a weighing means, and the weighing means weighs the articles in the storage tank to which it is attached. Based on the weighing signal from the weighing means and a predetermined constant, the supplying device provided in the storage tank equipped with the weighing means controls the supplying device so that articles of a constant weight are fed from the storage tank. Control means are provided.

Furthermore, storage means is provided for storing constants determined for each article. Furthermore, a supply means is provided for determining the storage tank in which the weighing means is attached and supplying a constant corresponding to the determination result from the storage means to the control means.

According to this means, when a storage tank different from the storage tank that was previously attached to the weighing means is attached to the weighing means in order to change the article to be supplied, the supplying means switches to the other storage tank. is determined, and a constant corresponding to the storage tank is supplied from the storage means to the control means.

<Example> This example has a plurality of loss-in-weight constant feed uniform type constant weight feeding devices as shown in Fig. 1, and each constant weight feeding device has a mixing device (
(not shown), however, in order to simplify the explanation, only one constant weight feeding device is shown.

This constant weight supply device includes, for example, a load cell 10 as a weighing means. This load cell 10 is provided with a storage tank and a supply feeder 12 in a detachable manner. 1st
Although only one storage tank and supply feeder 12 is shown in the figure, in reality, there are a plurality of storage tanks and supply feeders 12g, for example, three storage tanks and supply feeders 12g, each housing a different article therein.
12b and 12c are prepared, and one of them is attached to the load cell 1o. Each supply feeder is adapted to the nature of the articles in the storage tank in which it is provided, and supplies the articles in the storage tank to the mixing device.

The weighing signal from the load cell IO is supplied to the quantitative control section 14. The quantitative control unit 14 includes constant setters 16a, 16.
The constants selected by the gate circuit 18 from among the weight signals and constants are supplied to the quantitative control section 14, which controls the feeder controller 20a based on the weighing signal and the constants.

A control signal is supplied to 20b and 20c.

These feeder controllers 20a z 20b,
A drive signal is supplied to the supply feeder from one of 20c selected by the gate circuit 22.

The weighing signal of the load cell 1o is also supplied to the comparator 24. The comparison section 24 includes upper and lower limit level setters 24a, 24.
The upper and lower limit levels are supplied from one of b and 24c selected by the gate circuit 26, and when the weighing signal exceeds the upper limit level, the supply of articles to the storage tank is stopped,
When the weighing signal falls below the lower limit level, the supply of articles to the storage tank is started.

The gate circuits 18, 22, 26 are controlled by the identification signal from the identification sensor 3o. The identification sensor 3o is a storage tank and supply feeder 12 attached to the load cell 10.
This is done by, for example, detecting a difference in the wiring of a wire connector or by using a limit switch.

For example, if the storage tank and supply feeder 12a are attached to the load cell 10, the identification sensor? 30, the gate circuit 1st supplies a constant from the constant setter 16a to the quantitative control unit 14, the gate circuit 22 supplies a drive signal from the feeder controller 20a to the supply feeder, and the gate circuit 2nd supplies the upper and lower limits. The upper and lower limit levels are supplied from the level setter 26a to the comparison unit 24. In this state, if the storage tank and supply feeder 12 attached to the load cell IO is changed to 12b, the identification sensor 3
0, the gate circuit 18 sets the constant setter 1.
A constant is supplied from 6b to the quantitative control section 14, and the gate circuit 2
2 supplies the drive signal from the feeder controller 20b to the supply feeder, and the gate circuit 2 supplies the upper and lower limit levels to the comparator 24 from the upper and lower limit level setter 26b. The same applies when the storage tank and supply feeder 12 is changed to 12c.

Figure 2 uses a batch type constant weight feeder;
The feeder controller 20d% as in the embodiment of
One of the drive signals from 20e is selected by gate circuit 22 and supplied to the supply feeder.

Further, the feeder controller 20d is supplied with the apparent specific gravity selected by the gate circuit 34 from among the apparent specific gravity setters 32a and 32b. Similarly, the feeder controller 20e includes an apparent specific gravity setting device 36a.
Among the apparent specific gravity from 36b, one selected by gate circuit 38 is supplied.

Feeder controllers 20d% and 20e have constant
A control signal is supplied from the control unit 14. The quantity control section 14 is supplied with a weight signal from a load cell and a predetermined amount from a predetermined amount setting device 40, respectively. Further, one of the head amounts from the head setters 42a and 42b is selected by the gate circuit 44, and the quantitative control unit 14
is supplied to

Each gate circuit 22, 34, 44 is controlled by an identification signal from an identification sensor, similar to the embodiment shown in FIG.

Note that when a blending command is issued by a host computer or the like, erroneous operations can be prevented by mutually checking the blending command and the identification signal.

Effects> As described above, according to the present invention, the storage tank in which the weighing means is installed is determined, and a predetermined constant is supplied to the control means according to the determination result, so that the supplied article is There is no need for test runs to determine constants each time a change is made, improving work efficiency.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram of a first embodiment of a constant weight feeding device according to the present invention, Fig. 2 is a block diagram of a second embodiment of the same device, and Fig. 3 is a block diagram of a conventional FIG. 2 is a schematic diagram of a constant weight feeding device. 10... Weighing means, 12... Storage tank and supply feeder, 14.20a, 20b, 20c = control means, 16a, 16b, 16c... storage means,
18.30... Supply means.

Claims (1)

[Claims] (1) A plurality of storage tanks provided corresponding to a plurality of articles, and a supply for supplying articles from the storage tanks provided for each of the storage tanks according to the properties of the articles stored in each of the storage tanks. a weighing device configured to be detachably attached to each of the storage tanks for weighing articles in the storage tank; and a feeding device provided in the storage tank to which the weighing device is attached from the weighing device. control means for controlling the supply of a constant weight based on a signal and a predetermined constant, and a storage means for storing constants determined for each of the articles, respectively;
A constant weight supply device comprising: supply means for discriminating the storage tank in which the weighing means is attached and supplying the constant corresponding to the discrimination result from the storage means to the control means.