JP2002068482A - Gate valve of hopper for powder and grain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gate valve of a hopper for powder and grain comprising a leadout pipe furnished at the bottom with a valve hole and a valve plate to open and close the valve hole, wherein it is possible to prevent such an occurrence as difficulty in the valve opening and closing operation or poor performance of shutting-off owing to biting-in of the powder and grain to the space between the leadout pipe bottom surface and the valve plate. SOLUTION: The bottom surface 8 of the leadout pipe 7 positioned vertically for leading out the powder and grain from the hopper body 4 and the valve hole 9 opened at the bottom surface 8 are inclined with respect to a horizontal plane, and the valve plate 10 to open and close the valve hole 9 is inserted from above aslant and drawn off about the plate surface direction extending along the bottom surface 8 of the leadout pipe 7. Thereby the valve plate 10 washes the powder and grain during the open period of valve to prevent attachment of the powder and grain, and when the valve is being opened and closed, the powder and grain is rubbed off from the valve plate 10 by the edge of the hole 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate valve of a granular hopper, and more particularly to a gate valve of a granular hopper capable of preventing a cutoff failure due to the adhesion of a granular material.

[0002]

2. Description of the Related Art Generally, a hopper for storing powder and granules is
At least the lower part of the hopper body, which is a container for storing the granular material, is formed in a funnel shape, and a lower end of the hopper body is provided with a gate valve for controlling the removal of the granular material.

As the gate valve, a rotary valve type, a ball valve type, a gate valve type having a rotor which rotates around a horizontal axis and has a plurality of grooves formed on its peripheral surface and extending parallel to the rotation axis is formed. and so on.

A gate valve of the gate valve type has an outlet pipe communicated with a lower end of a hopper body, a valve port opened at a lower end face of the outlet pipe, and a gate port inserted and removed in a plate surface direction along the lower end face of the outlet pipe. And a valve plate that opens and closes the valve port by being operated. The lower end face and the valve port of the outlet pipe are often set at right angles to the axis of the outlet pipe.
No.-1003773 (Japanese Utility Model Laid-Open No. 60-12534)
As shown in FIG. 3, the inclination may be made with respect to the axis of the outlet pipe. In the conventional example in which the valve port and the lower end face of the outlet pipe are inclined, the valve plate is inclined in parallel with the valve port and the lower end face of the outlet pipe, but the valve plate is oriented in a direction orthogonal to the axis of the outlet pipe. It is designed to be inserted and removed.

[0005]

By the way, in a general gate valve type gate valve in which a horizontally disposed valve plate moves in a horizontal direction, when the powder particles flowing down the outlet pipe are not fully opened, the valve is closed. It is blocked by the plate and accumulates on the valve plate, and when opening or closing the valve, powder particles are caught between the lower end surface of the outlet pipe and the valve plate, making it difficult to open or close the valve. There is a problem that the valve cannot be closed.

In a conventional gate valve of a gate valve type in which a valve plate tilted with respect to a horizontal plane is horizontally moved, the upper surface of the valve plate is washed by the flow of powder during opening, so that the upper surface of the valve plate is closed. Although it is difficult for the powder to accumulate, if the powder accumulates on the valve plate for any reason, even if the valve plate is moved in the opening and closing direction, the powder and the particle are not scraped off the valve plate, and the deposited powder and particle are disturbed. As a result, it becomes difficult to move the valve plate, or a poor closing that cannot be fully closed occurs.

[0007] The present invention solves this problem of the prior art,
Provided is a gate valve of a granular material hopper which can prevent the granular material from being caught between the lower end surface of the outlet pipe and the valve plate, thereby making opening / closing difficult or causing a cutoff failure. With the goal.

[0008]

According to the present invention, in order to achieve the above-mentioned object, the lower end face and the valve port of the outlet pipe are inclined with respect to a horizontal plane, and the valve plate is located below the outlet pipe. A technical means of being inserted and removed from an obliquely upward direction of the plate surface inclined along the end face and the valve port is employed.

According to the above configuration, when the valve is not fully opened and fully closed, the upper surface of the valve plate is washed by the flow of the granular material, so that the granular material does not accumulate on the upper surface of the valve plate. .

[0010] In addition, during the fully closed state, the granular material accumulates on the upper surface of the valve plate due to the pressure of the granular material. The granular material can be rubbed off from the valve plate at the lip of the valve port by being biased by the pressure and the own weight, and the granular material can be prevented from biting between the lower end surface of the outlet pipe and the valve plate.

Further, even when the flow rate of the powder particles decreases at the time of the minute opening, the powder particles may stay on the upper surface of the valve plate, the adhesion between the staying powder particles and the valve plate is extremely high. When the valve plate is inserted obliquely downward and the valve port is closed, the powder particles that remain on the upper side of the valve plate are surely scraped off by the lip of the valve port, and the lower end surface of the outlet pipe and the valve are closed. It is possible to prevent the granular material from being caught between the plate and the plate.

Further, in the present invention, it is preferable that the valve port is formed in a triangular shape with one side as a center and a vertex opposed to the one side rotated downward.

With the above-described configuration, the control of the opening degree of the valve port is simplified.

In the present invention, the term "granules" refers to aggregates of solid particles called pulverized bodies, pulverized particles, pulverized powders, pulverized materials, powders, powders, etc. Fine powder of １1 μm, ordinary powder of 1 to 100 μm, coarse powder of 0.1 to 1 mm, granules of 1 mm or more, etc. are included.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gate valve of a granular hopper according to one embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 3 is a block diagram of a powder / granule blending apparatus using the gate valve of the powder / granular hopper according to the present invention. The apparatus is provided with two raw powder hoppers 1, 1 and supplied from these. And a mixing hopper 2 for mixing the raw materials. The raw material powder, for example, the salt powder stored in one of the raw material powder hoppers 1 and 1 is dropped into the mixing hopper 2 while being measured, and a predetermined amount of the salt powder is stored in the mixing hopper 2. After that, the other raw material powders, for example, sodium glutamate powder, are dropped from the other of the raw material hoppers 1 and 1 into the blending hopper 2 while being measured, and a predetermined amount of sodium glutamate is stored in the blending hopper 2. The raw material powder is transported to the next step by the wind power transport device 3 connected to the compounding hopper 2.

Each raw material powder hopper 1 includes a hopper body 4 formed in a funnel shape with a lower part tapered downward, and a gate valve 5 for controlling the discharge of the raw material powder from the hopper body 4. It is connected to the compounding hopper 2 via the gate valve 5 and the bellows-shaped flexible tube 6.

As shown in the cross-sectional view of FIG. 1, the gate valve 5 is provided with a discharge pipe 7 for discharging the powder from the hopper body 4 for storing the powder and a lower end face 8 of the discharge pipe 7. There is provided a valve port 9 opened so as to cross the outlet pipe 7, and a valve plate 10 which opens and closes the valve port 9 by being inserted and removed in a plate surface direction along a lower end surface 8 of the outlet pipe 7.

Naturally, the valve plate 10 is longer than the valve port 9 in the insertion / removal direction and the plate width direction perpendicular to the valve port 9 in order to fully close the valve port 9.

The gate valve 5 has a valve plate 10 in the plate surface direction, a fully closed position in which the valve plate 10 fully closes the valve port 9, and a valve port in a direction obliquely above the plate surface. A drive means 11 is provided for moving forward and backward over a fully open position where the shutter 9 is fully opened.

The drive source of the drive means 11 is not particularly limited, and an actuator, an electric motor, a motor, and the like utilizing the pressure of a pressure fluid such as compressed air, steam, pressurized oil, or pressurized water can be used. The operation principle is simple, delicate control is simple, and the cylinder 12 that utilizes the pressure of the pressure fluid that can be accurately performed is used. As the pressure fluid for driving the cylinder 12, compressed air that hardly causes a problem of contamination of the raw material powder is used.

The piston rod 13, which is the output end of the cylinder 12, may be connected to the valve plate 10 via a transmission mechanism such as a belt, a chain, and a link. However, in this embodiment, the operation accuracy is improved. For this purpose, the valve plate 10 is directly connected to the piston rod 13 via the adapter 14.

The flow path in the outlet pipe 7 is formed so as to be tapered from the upstream side of the valve port 9 toward the valve port 9.

More specifically, as shown in the perspective view of FIG. 2, the lead-out pipe 7 has a quadrangular plate frame-shaped upper flange 71,
It comprises an isosceles triangular frame-shaped lower flange 72 and a body 74 surrounding a flow path 73 formed between these inner peripheral surfaces.

The cross-sectional shape of the flow passage 73 formed in the body 74 is a horizontal rectangle A on the upper surface of the upper flange 71, and the rectangular shape and the width at a position lower than the upper surface of the upper flange 71 by a predetermined height. And the height is the same, so as to form a horizontal isosceles triangle B (shown with horizontal hatching), so that the cross-sectional area of the flow path 73 is changed from the upstream side of the valve port 9 to the valve port 9
Towards one half.

The cross-sectional shape of the flow path 74 is obtained by further rotating the horizontal isosceles triangle such that a vertex opposed to the base is lowered around the base of the isosceles triangle. It changes to an isosceles triangle C (indicated by double hatching) which has a common base with the right isosceles triangle and is inclined at, for example, 30 ° with respect to the horizontal plane. The height of the inclined isosceles triangle may be the same as the height of the horizontal isosceles triangle, or may be lower or higher.

In this way, when the flow path in the outlet pipe 7 is formed so as to be tapered from the upstream side of the valve port 9 toward the valve port 9, the raw material dropped from the hopper body 4 to the outlet pipe 7 is formed. The powder flows down smoothly to the valve port 9.

Further, it is advantageous to form the valve port 9 into a triangular shape in which the shape of the valve port 9 is rotated around one side so that the vertex facing the one side is lowered, since the opening degree of the valve port 9 can be easily controlled. .

By the way, as shown in FIG. 1, in this embodiment, if necessary, the raw material powder falling from the raw material hopper 1 through the gate valve 5 to the flexible tube 6 scatters around. The gate valve 5 to prevent
Is provided from all sides, and if necessary, in order to prevent the valve plate 10 from being separated from the lower end surface of the outlet pipe 7 and the valve port 9, the valve plate 10 is placed on a horizontal plane. A guide rail 16 is provided to guide the slide pipe 7 so as to slide in contact with the lower end face 8 and the valve port 9 of the outlet pipe 7 inclined.

Further, the cylinder 12 is fixed to a mounting cylinder 17 which extends continuously obliquely upward on one side of the casing 15, and the piston rod 13 which protrudes into the mounting cylinder 17 has powder particles. In order to prevent the body from adhering to the piston rod 13 and to prevent a small amount of oil adhering to the piston rod 13 from being mixed into the raw material powder, a bellows-like tubular elastic cover 18 is provided.

Although not shown in the drawing, if necessary, the mounting cylinder portion 17 is provided with an inspection opening and an inspection opening cover for opening and closing the inspection opening from the outside.

According to this gate valve 5, when the valve port 9 is closed with the valve plate 10, the supply of the raw material powder from the raw material powder hopper 1 to the compounding hopper 2 is stopped, and the valve plate 10 is moved obliquely upward in the plate surface direction. When the valve port 9 is opened by pulling up, the raw material powder is dropped from the raw material powder hopper 1 to the compounding hopper 2.

When the valve port 9 is fully closed by the valve plate 10,
The raw material powder in the outlet pipe 7 is blocked by the valve plate 10, and the raw material powder pressed against the valve plate 10 may adhere to the valve plate 10 due to the pressure and the weight of the raw material powder.

However, when the valve plate 10 is lifted obliquely upward in the plate surface direction, the raw material powder adhering to the upper surface of the valve plate 10 is urged by the pressure of the raw material powder and its own weight while the upper edge of the valve port 9 is urged. As a result, the raw material powder does not bite between the lower end surface 8 of the outlet pipe 7 and the upper surface of the valve plate 9, and the valve port 9 can be smoothly opened to the fully open position. it can.

In particular, in this embodiment, as described above,
Since the valve plate 10 is guided by the guide rail 16 so as to be in sliding contact with the lower end surface 8 of the outlet pipe 7 and the valve port 9, the raw material powder adhering to the upper surface of the valve plate 10 is reliably removed from the valve port 9. The raw material powder is scraped off by the edge, and when the valve is opened,
Is more reliably prevented from being caught between the lower end surface 8 of the valve and the valve plate 10, and it is difficult to open the valve due to the granular material being caught between the lower end surface 8 of the outlet pipe 7 and the valve plate 10. Is more reliably prevented.

In this embodiment, when the supply amount of the raw material powder from the raw material powder hopper 1 to the compounding hopper 2 approaches a predetermined amount after the valve port 9 is fully opened, the valve plate 10 is moved from the fully open position to the plate surface direction. The material powder is moved obliquely downward by a predetermined amount. For example, by half-opening the valve port 9, the flow rate of the raw material powder is reduced. By reducing the flow rate of the powder to a small amount and fully closing the valve port 9 when the supply amount to the mixing hopper 2 reaches a predetermined amount, the supply amount of the raw material powder to the mixing hopper 2 is accurately controlled.

During the supply of the raw material powder to the compounding hopper 2 with the valve port 9 fully open or half open, the upper surface and the tip surface of the valve plate 10 are washed with the flowing raw material powder. The raw material powder does not adhere to the upper surface or the tip surface.

However, immediately before closing the valve in which the flow rate of the raw material powder is remarkably reduced by narrowing the opening degree of the valve port 9 to a small value, the valve plate 1 is closed.
0, the flow of the raw material powder along the upper surface of the valve plate 10 becomes slower, which makes it easier for the raw material powder to stay on the upper surface of the valve plate 10, and the valve plate 10
There is a possibility that the raw material powder adheres to the upper surface of the substrate.

However, since the adhesive force acting between the raw material powder staying on the upper surface of the valve plate 10 and the valve plate 10 is weak enough to be released by making the flow of the raw material powder faster, the valve plate The raw material powder retained on the upper surface of the valve plate 10 can be easily scraped off by the V-shaped rim of the valve port 9 by moving the port 10 obliquely downward. Therefore, the valve port 9 can be completely closed smoothly without the raw material powder being caught between the lower end surface 8 of the outlet pipe 7 and the valve plate 10.

In particular, in this embodiment, as described above,
Since the valve plate 10 is guided by the guide rail 16 so as to be in sliding contact with the lower end surface 8 of the outlet pipe 7 and the valve port 9, the raw material powder adhering to the upper surface of the valve plate 10 is reliably removed from the valve port 9. It is scraped off by the rim, and the raw material powder is more reliably prevented from being caught between the lower end surface 8 of the outlet pipe 7 and the valve plate 10 at the time of the opening / closing valve.

As described above, according to the gate valve 5, the raw material powder that has accumulated or adhered to the upper surface of the valve plate 10 is scraped off by the rim of the valve port 9 at the time of valve opening and valve closing, and is led out. Since it does not get caught between the lower end face 8 of the pipe 7 and the valve plate 10, the gate valve 5 can be opened and closed smoothly, and a poor closing of the gate valve 5 can be prevented.

[0042]

As described above, in the gate valve of the granular hopper according to the present invention, the lower end face and the valve port of the outlet pipe are inclined with respect to the horizontal plane, and the valve plate is connected to the outlet port. Since the valve is inserted and removed from the obliquely upward direction of the plate surface inclined along the lower end surface of the pipe and the valve port, when the valve plate is moved in the valve opening direction, the valve port is biased by the pressure of the granular material and its own weight. At the rim of the powder particles are scraped off from the valve plate,
The particulate matter is prevented from being caught between the lower end face of the outlet pipe and the valve plate, and the valve can be opened until it is fully opened smoothly.
The effect described above can be obtained.

Further, according to the present invention, since the upper surface of the valve plate is washed by the flow of the particulate material when the valve is opened, the particulate material accumulates on the valve body during the opening of the valve and also during the opening of the valve. Since the particles can be prevented from adhering to the valve element, the particles adhering to or accumulating on the valve element during valve opening may be caught between the lower end surface of the outlet pipe and the valve plate when the valve is closed or opened. It is also possible to obtain an effect that it is possible to prevent the opening and closing of the opening / closing unit from becoming difficult, and to prevent the occurrence of a deadline failure.

Further, according to the present invention, even if the particulate matter stays or adheres to the upper surface of the valve plate when the valve is minutely opened, the attachment of the particulate matter to the valve plate in this case is possible. Since the adhering force is weak, the powder on the valve plate is scraped off at the rim of the valve port by moving the valve plate in the valve closing direction, and the gap between the lower end surface of the outlet pipe and the valve plate is removed. As a result, it is possible to prevent the granular material from biting, to smoothly close the gate valve, and to obtain an effect that the valve can be reliably closed to the fully closed position.

[Brief description of the drawings]

FIG. 1 is a sectional view of the present invention.

FIG. 2 is a perspective view of an outlet pipe of the present invention.

FIG. 3 is a configuration diagram of a granular material blending apparatus using the present invention.

[Description of Signs] 4 Main body of hopper 5 Gate valve 7 Outlet tube 8 Lower end surface 9 Valve port 10 Valve plate

Claims (2)

[Claims] 1. An outlet pipe for discharging powder particles from a hopper main body storing the powder particles, a valve port opened at a lower end of the outlet pipe so as to cross the outlet pipe, and a lower portion of the outlet pipe. In a gate valve of a granular hopper having a valve plate that opens and closes the valve port by being inserted and removed in a plate surface direction along an end surface, a lower end surface of the outlet pipe and the valve port are inclined with respect to a horizontal plane. A gate valve for a granular hopper, wherein the valve plate is inserted and withdrawn from an obliquely upward direction of a plate surface inclined along the lower end surface and the valve port of the outlet pipe. 2. The gate valve for a granular hopper according to claim 1, wherein the valve port is formed as a triangle having one side thereof as a center and a vertex opposed to the one side rotated downward.