JPH05730A - Particulate supply method and device thereof - Google Patents

Abstract

PURPOSE:To remove residual particulates from a storage tank and so on by dropping the particulates little by little while narrowing down opening of a butterfly valve after a prescribed quantity of particulates are supplied, and closing the butterfly valve when the whole quantity of the particulates are supplied. CONSTITUTION:A particulate supply device is provided with a pipe conduit 3 having a butterfly valve 5 driven so as to be opened/closed by means of an air cylinder 6 and a load cell to detect weight of a container. In the case of supplying particulates, the butterfly valve 5 is used in a large opening, so that the particulates can be dropped, and when the weight of the container reached the first prescribed value, a jogging contact point is opened, so that a limit switch can be operated. Thereby, the jogging operation is carried out by narrowing down the opening of the butterfly valve 5, and when the weight of the container reached the second prescribed value, the jogging contact point is closed, so that the operation of the limit switch can be released, and the butterfly valve 5 is closed by turning off a main switch. Thereby, the problems such as the particulates remain behind in a flow passage or are blown off from the flow passage can be solved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supplying various powders from a storage tank by dropping them into a container by a fixed amount, and
It relates to a device used for carrying out the method.

[0002]

2. Description of the Related Art In the fields of mixed feed preparation, food processing, pharmaceutical manufacturing, or mining, it is often necessary to extract a certain amount of powder from a storage tank, supply it, and mix it. In order to supply a certain amount of powder or granules in response to this need, the flow rate should be controlled. Conventional methods have been to adjust the opening of the slide gate and the rotation speed of the table feeder. Or, it is the adjustment of the rotation speed and pitch of the screw feeder.

No matter which of the above-mentioned devices is used, it is difficult to leave the powder particles in the feeding device and to make a complete payout. Residues can cause contamination if the powders they handle change. In addition, in the slide gate, powder particles may be blown out due to the pressure difference between the inside and the outside of the slide portion.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems associated with the supply of powder and granules, and to supply the powder and granules without remaining in the intermediate portion between the storage tank and the container, and It is to provide a supply method capable of accurately controlling the supply amount and a supply device used for the implementation.

[0005]

A method of providing a granular material according to the present invention comprises:
It is a method of dropping into a container placed below and supplying it, using a pipe line with a butterfly valve that is capable of jogging, opening the butterfly valve at a large opening to drop the powder and granules, while receiving The weight is measured continuously to detect the supply amount, and after a certain proportion of the total amount to be supplied has been supplied, the butterfly valve opening is reduced to perform the jogging operation. Thus, the powder and granular materials are dropped little by little, and the butterfly valve is closed and the supply is stopped when the supply of the entire amount is completed.

As shown in FIG. 1, the apparatus for supplying the granular material of the present invention has a container (2) arranged below a predetermined amount of the granular material (8) contained in a storage tank (1). (3) a device for dropping and supplying to a container, a pipeline (3) having a butterfly valve (5) that is driven to open and close by an air cylinder (6), and a load cell (4) for detecting the weight of a container
As a drive mechanism (7) for the air cylinder, as shown in FIGS. 2 and 3, a limit switch contact portion (75) that operates according to the rotation angle of the butterfly valve to enable the jogging operation of the butterfly valve, Main switch (7
3), a limit switch (72) and a jogging contact (74), and an electromagnetic valve (71) for controlling the air cylinder are provided, and the butterfly valve is opened at a large opening when the main switch is turned on, and the granular material When the container weight reaches the first predetermined value, the jogging contact is opened and the limit switch is operated to reduce the opening of the butterfly valve to a small amount for the jogging operation to reach the second predetermined value. When it reaches the limit, the jogging contact is closed, the limit switch is deactivated, the main switch is turned off, and the butterfly valve is closed.

In the example shown in FIG. 2, the limit switch contact portion has a structure which is opened and closed by a cam attached to the shaft of the butterfly valve, but a bar may be used instead of the cam.

[0008] This device may have a two-way pipe line, and each may have a butterfly valve driven separately.

[0009]

The air cylinder (6) rotates the butterfly valve (5) by turning on the main switch (73) and operating the solenoid valve (71) to fully open or close it. When the granular material falls from the storage tank (1) through the pipe line (3) into the container (2), the increase in the amount is read by the load cell (4) every moment.

When a predetermined amount, for example, 90 to 95% of the total amount of powder or granular material has fallen into the container, a signal is given to the jogging contact (74) to turn it off, and the limit switch (72) is activated. to enable.

When the limit switch circuit operates, the butterfly valve (5) first moves in the closing direction. Because of the cam (75) that rotates with the valve in the process, the limit switch is turned on and the butterfly valve, which was moving in the closing direction, is moved in the opposite opening direction. Then, the limit switch is turned off, and the butterfly valve moves in the closing direction again.

A jogging operation is performed by repeating such opening and closing motions, and the powdery particles gradually drop. This situation is as shown in FIG.

When it is detected by the load cell (4) that a predetermined amount of powder or granular material has fallen into the container (2), the main switch (73) is turned off and the solenoid valve and the air cylinder are operated. , Close the butterfly valve completely to complete the supply.

There is a powder or granular material that is still falling in the pipe after the butterfly valve is closed, and this additional amount is not detected by the load cell when the valve is closed, which may cause an error. Although the amount is small and usually negligible, measure the amount of powder particles falling during jogging operation and the time required for the particles to pass from the butterfly valve to enter the container. By doing so, the additional amount can be predicted. Therefore, if necessary, the drive device may be set so that the butterfly valve is closed at the time when the amount of drop is subtracted from the amount of the drop, so that accurate supply can be performed.

Further, in the structure of the limit switch contact portion described above, the opening of the butterfly valve during the jogging operation can be arbitrarily set by adjusting the shape of the cam and the mounting angle of the bar.

[0016]

EFFECTS OF THE INVENTION According to the present invention, there is no problem that the powdery particles remain in the flow channel or blow out from the flow channel due to the use of the conventional table feeder, screw feeder, slide discharger, etc. Amount can be supplied.

Since the device of the present invention has a simple structure and can be manufactured using ready-made parts, the cost is low and the maintenance is easy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view partially conceptually showing an example of an apparatus for supplying a powder or granular material of the present invention.

FIG. 2 is a side view showing a part of a main portion of the apparatus shown in FIG. 1 in section.

FIG. 3 is a conceptual explanatory diagram showing an example of a control part of the apparatus of FIG.

FIG. 4 is a graph showing the opening of the butterfly valve over time, showing the method of operating the device of the present invention.

[Explanation of symbols]

1 tank 2 containers 3 pipelines 4 load cell 5 butterfly valve 6 air cylinders 7 Air cylinder drive mechanism 71 Solenoid valve 72 Limit switch 73 Main switch 74 Jogging contact 75 Limit switch contact (cam) 8 powder

Claims (4)

[Claims] 1. A method for dropping a predetermined amount of powder or granular material contained in a storage tank into a container arranged below and supplying the powder or granular material, the method comprising using a conduit having a butterfly valve capable of jogging operation, and performing butterfly operation. Open the valve at a large opening to drop the powder and granules, measure the weight of the container in the meantime to continuously detect the supply amount, and a certain proportion of the total amount to be supplied is After being supplied, the butterfly valve is throttled to perform a jogging operation to drop the granular material little by little, and the butterfly valve is closed and the supply is stopped when the entire amount has been supplied. Method of supplying granules. 2. An apparatus for dropping and supplying a predetermined amount of powder or granular material contained in a storage tank (1) to a container (2) arranged below, which is opened and closed by an air cylinder (6). A butterfly valve (5) having a conduit (3) having a butterfly valve (5) and a load cell (4) for detecting the weight of the container, and operating as an air cylinder drive mechanism (7) according to the rotation angle of the butterfly valve. Is provided with a limit switch contact part (75) for enabling the jogging operation and a solenoid valve (71) connected to the main switch (73), the limit switch (72) and the jogging contact (74) for controlling the air cylinder. , When the main switch is turned on, the butterfly valve is opened with a large opening to drop the powder and granules, and when the weight of the container reaches the first predetermined value, the jogging contact is made. By opening the point and operating the limit switch, the opening of the butterfly valve is narrowed down to perform the jogging operation, and when the second predetermined value is reached, the jogging contact is closed and the limit switch operation is released. A device for supplying powder and granules configured to turn off the switch and close the butterfly valve. 3. The apparatus according to claim 2, wherein the limit switch contact portion has a structure of a cam or a bar attached to the shaft of the butterfly valve. 4. The apparatus according to claim 2, wherein the pipe line is of a two-way type, each of which is provided with a butterfly valve driven separately.