JP3794910B2 - Granular hopper gate valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gate valve for a powder hopper, and more particularly to a gate valve for a powder hopper that can prevent a deadline due to adhesion of the powder.
[0002]
[Prior art]
In general, a hopper for storing powder particles has a funnel-shaped at least lower part of a hopper body that is a container for storing powder particles, and includes a gate valve for controlling the removal of the powder particles at the lower end of the hopper body. ing.
[0003]
As the gate valve, there are a rotary valve type, a ball valve type, a gate valve type, etc., which have a rotor that rotates around a horizontal axis and has a plurality of grooves formed on the peripheral surface extending in parallel with the rotation axis. .
[0004]
The gate valve of the gate valve type is inserted / extracted in the direction of the plate surface along the lower end surface of the outlet pipe connected to the lower end of the hopper body, the valve port opened at the lower end surface of the outlet pipe And a valve plate for opening and closing the valve opening. The lower end surface and the valve port of the outlet pipe are often set at right angles to the axis of the outlet pipe. For example, FIG. 3 of Japanese Utility Model Application No. 58-10000373 (Japanese Utility Model Publication No. 60-12534) is shown. Thus, it may be inclined with respect to the axis of the outlet pipe. In the conventional example in which the lower end surface of the valve port and the outlet pipe is inclined, the valve plate is inclined in parallel with the lower end surface of the valve port and the outlet pipe, but the valve plate is in a direction perpendicular to the axis of the outlet pipe. It is designed to be inserted and removed.
[0005]
[Problems to be solved by the invention]
By the way, in a general gate valve type gate valve in which a horizontally arranged valve plate moves in the horizontal direction, when the valve plate is not fully opened, the granular material flowing down the outlet pipe is blocked by the valve plate, Accumulated on the top, and when opening or closing the valve, it is difficult to open or close the valve due to powder particles being caught between the lower end surface of the outlet pipe and the valve plate, or the valve cannot be completely closed There is a problem of doing.
[0006]
The conventional gate valve type gate valve that horizontally moves the valve plate that is inclined with respect to the horizontal plane is cleaned by the flow of the granular material while the valve is open. However, if for some reason the particles accumulate on the valve plate, the particles will not rub off from the valve plate even if the valve plate is moved in the open / close direction. It may be difficult to move the valve plate, or a deadline failure may occur in which the valve plate cannot be fully closed.
[0007]
The present invention solves this problem of the prior art, and prevents the granular material from being caught between the lower end surface of the outlet pipe and the valve plate, thereby making it difficult to open and close or to cause a cutoff failure. It is an object of the present invention to provide a gate valve for a granular hopper.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a lead-out pipe that leads out the granular material from the hopper body that stores the powder, and a valve port that is opened at the lower end of the lead-out pipe so as to cross the lead-out pipe. In a gate valve of a granular hopper comprising a valve plate that opens and closes the valve port by being inserted and removed in a plate surface direction along the lower end surface of the outlet tube, the flow path in the outlet tube is upstream of the valve port. The flow passage is tapered from the side toward the valve port, and the cross-sectional area of the flow path is reduced by a factor of 2 from the upstream side of the valve port toward the valve port. And the valve port is formed in a triangle rotated around the one side so that the apex facing the one side is lowered, and the valve plate is formed on the lower end surface of the outlet pipe and the valve. From the diagonally upward direction of the plate surface inclined along the mouth Adopt the technical means that are disconnect.
[0009]
According to the configuration described above, when the valve plate 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 is not deposited on the upper surface of the valve plate.
[0010]
In addition, during full closure, the granular material accumulates on the upper surface of the valve plate due to the pressure of the granular material, but by pulling the valve plate diagonally upward and opening the valve opening, Thus, the granular material can be scraped off from the valve plate at the lip of the valve port, and the granular material can be prevented from biting between the lower end surface of the outlet tube and the valve plate.
[0011]
Furthermore, even when the flow rate of the granular material decreases at the minute opening and the granular material may stay on the upper surface of the valve plate, the adhesion force between the retained granular material and the valve plate is very weak. Therefore, when the valve plate is inserted obliquely downward and the valve port is closed, the powder particles staying 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 plate are It is possible to prevent the granular material from being caught between them . Further, since the valve port is formed in a triangular shape, the opening degree of the valve port can be easily controlled.
[0012]
In the present invention, it is preferable that the valve port is formed in an isosceles triangle .
[0013]
By configuring as described above, it is easy to control the opening degree of the valve opening.
[0014]
In addition, in this invention, a granular material means the aggregate | assembly of the solid particle | grains called a pulverized body, a pulverized particle, a pulverized powder, a pulverized material, a powdery material, a powdery body, etc. Fine powder, normal powder of 1 to 100 μm, coarse powder of 0.1 to 1 mm, granules of 1 mm or more, and the like are included.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
A gate valve of a granular hopper according to an embodiment of the present invention will be described in detail with reference to the drawings.
[0016]
FIG. 3 is a block diagram of a powder blending device using a gate valve of a powder hopper according to the present invention, which blends two raw material powder hoppers 1 and 1 and raw materials supplied from these. The raw material powder stored in one of the raw material powder hoppers 1 and 1, for example, salt powder is dropped into the mixing hopper 2 while being metered, and a predetermined amount of salt powder is stored in the mixing hopper 2. Then, another raw material powder such as sodium glutamate powder is dropped from the other one of the raw material hoppers 1 and 1 into the blending hopper 2 while being metered, and a predetermined amount of sodium glutamate is stored in the blending hopper 2, and thereafter these raw material powders It is comprised so that it may convey to the following process with the wind-powered conveying apparatus 3 connected to the mixing | blending hopper 2. FIG.
[0017]
Each raw material powder hopper 1 includes a hopper body 4 formed in a funnel shape with a lower bottom, and a gate valve 5 for controlling discharge of the raw material powder from the hopper body 4. 5 and a bellows-like flexible tube 6 are connected to the blending hopper 2.
[0018]
As shown in the cross-sectional view of FIG. 1, the gate valve 5 includes a lead-out pipe 7 that leads out the granular material from the hopper body 4 that stores the powder and the lead-out pipe 7 on the lower end surface 8 of the lead-out pipe 7. And a valve plate 10 that opens and closes the valve port 9 by being inserted and extracted in a plate surface direction along the lower end surface 8 of the outlet pipe 7.
[0019]
As a matter of course, the valve plate 10 is longer than the valve port 9 in the insertion / extraction direction and the plate width direction orthogonal to the valve port 9 in order to fully close the valve port 9.
[0020]
Further, the gate valve 5 opens the valve port 9 in the plate surface direction, the valve plate 10 fully opens the valve port 9 at a fully closed position where the valve port 9 is fully closed, and obliquely above the plate surface direction. Drive means 11 for moving forward and backward over the fully open position.
[0021]
The driving source of the driving unit 11 is not particularly limited, and an actuator, an electric motor, a motor, or the like that uses the pressure of a pressurized fluid such as compressed air, steam, pressurized oil, or pressurized water can be used. A cylinder 12 that utilizes the pressure of a pressure fluid that can be easily and delicately controlled easily and accurately is used. Further, 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.
[0022]
The piston rod 13, which is the output end of the cylinder 12, may be interlocked with the valve plate 10 through a transmission mechanism such as a belt, chain, link, etc. In this embodiment, in order to increase the operation accuracy, The valve plate 10 is directly connected to the piston rod 13 via the adapter 14.
[0023]
By the way, the flow path in the outlet pipe 7 is formed so as to taper from the upstream side of the valve port 9 toward the valve port 9.
[0024]
More specifically, as shown in the perspective view of FIG. 2, the lead-out pipe 7 includes a quadrilateral plate frame-shaped upper flange 71, an isosceles triangular frame-shaped lower flange 72, and an inner peripheral surface thereof. And a body 74 surrounding the formed flow path 73.
[0025]
The cross-sectional shape of the flow path 73 formed in the body 74 is a horizontal rectangle A on the upper surface of the upper flange 71, and the rectangle, width and height at a position lower than the upper surface of the upper flange 71 by a predetermined height. Are the same horizontal isosceles triangle B (shown with horizontal hatching), thereby reducing the cross-sectional area of the flow path 73 from the upstream side of the valve port 9 to the valve port 9 by a factor of two. ing.
[0026]
The cross-sectional shape of the flow path 74 is further changed from the horizontal isosceles triangle to the horizontal isosceles by rotating the apex facing the base downward from the horizontal isosceles triangle. The triangle and the base are common, and change to an isosceles triangle C (shown with double hatching) inclined by, 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, and may be lower or higher.
[0027]
When the flow path in the outlet pipe 7 is formed so as to taper from the upstream side of the valve port 9 toward the valve port 9 in this way, the raw material powder falling from the hopper body 4 to the outlet pipe 7 is smooth. Then, it flows down to the valve port 9.
[0028]
Further, if the shape of the valve port 9 is formed in a triangle rotated around the one side so that the apex opposite to the one side is lowered, it is advantageous because the opening degree of the valve port 9 can be easily controlled.
[0029]
By the way, as shown in FIG. 1, in this embodiment, in order to prevent the raw material powder falling from the raw material powder hopper 1 through the gate valve 5 and falling into the flexible tube 6 from scattering to the surroundings as 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 if necessary, a valve plate 15 is provided which covers the gate valve 5 from four sides. A guide rail 16 is provided that guides 10 so that it moves in sliding contact with the lower end surface 8 and the valve port 9 of the outlet pipe 7 inclined with respect to the horizontal plane.
[0030]
Further, the cylinder 12 is fixed to a mounting cylinder part 17 continuously projecting obliquely upward on one side of the casing 15, and a piston of a granular material is attached to a piston rod 13 which has entered the mounting cylinder part 17. In order to prevent adhesion to the 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 tubular expandable cover 18 is covered.
[0031]
Although not shown in the figure, the attachment cylinder portion 17 is provided with an inspection port and an inspection port lid that opens and closes the inspection port from the outside as necessary.
[0032]
According to this gate valve 5, when the valve port 9 is closed by the valve plate 10, the supply of the raw material powder from the raw material powder hopper 1 to the blending hopper 2 is stopped, and the valve plate 10 is lifted obliquely upward in the plate surface direction. When the mouth 9 is opened, the raw material powder is dropped from the raw material powder hopper 1 to the blending hopper 2.
[0033]
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 by the pressure and weight of the raw material powder is It may adhere to the plate 10.
[0034]
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 easily urged by the upper edge of the valve port 9 while being urged by the pressure of the raw material powder and its own weight. Since it is scraped off from the valve plate 10, 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.
[0035]
In particular, in this embodiment, as described above, the valve plate 10 is guided by the guide rail 16 so as to be in sliding contact with the lower end surface 8 and the valve port 9 of the outlet tube 7, so that it adheres to the upper surface of the valve plate 10. The raw material powder is surely scraped off by the lip of the valve port 9, and the raw material powder is more reliably prevented from being sandwiched between the lower end surface 8 of the outlet pipe 7 and the valve plate 10 when the valve is opened. It is more reliably prevented that the opening of the valve becomes difficult due to the powder particles being caught between the lower end surface 8 of the outlet pipe 7 and the valve plate 10.
[0036]
By the way, in this embodiment, after the valve port 9 is fully opened, when the supply amount of the raw material powder from the raw material powder hopper 1 to the blending hopper 2 approaches a predetermined amount, the valve plate 10 is inclined obliquely downward in the plate surface direction from the fully open position. When the flow rate of the raw material powder is reduced by moving a predetermined amount, for example by half-opening the valve port 9, and the supply amount of the raw material powder further approaches the predetermined amount, the flow rate of the raw material powder is further reduced by opening the valve port 9. The amount of the raw material powder supplied to the blending hopper 2 is accurately controlled by fully closing the valve port 9 when the feed amount to the blending hopper 2 reaches a predetermined amount.
[0037]
While the valve port 9 is fully opened or half-opened and the raw material powder is supplied to the blending hopper 2, 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 surface.
[0038]
However, the flow rate of the raw material powder along the upper surface of the valve plate 10 becomes slow just before the valve closing, in which the opening of the valve port 9 is narrowed down and the flow rate of the raw material powder is remarkably slowed. The raw material powder tends to stay on the upper surface, and the raw material powder may adhere to the upper surface of the valve plate 10.
[0039]
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 if the flow of the raw material powder is accelerated, the valve plate 10 is inclined. By moving downward, the raw material powder staying on the upper surface of the valve plate 10 can be easily scraped off by the V-shaped lip of the valve port 9. Accordingly, the valve port 9 can be smoothly fully closed without the raw material powder being caught between the lower end surface 8 of the outlet pipe 7 and the valve plate 10.
[0040]
In particular, in this embodiment, as described above, the valve plate 10 is guided by the guide rail 16 so as to be in sliding contact with the lower end surface 8 and the valve port 9 of the outlet tube 7, so that it adheres to the upper surface of the valve plate 10. The raw material powder is surely scraped off by the rim of the valve port 9, 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 opening / closing valve.
[0041]
Thus, according to the gate valve 5, the raw material powder staying on or adhering to the upper surface of the valve plate 10 is scraped off by the lip of the valve port 9 when the valve is opened or closed. Since the lower end surface 8 and the valve plate 10 are not bitten, the gate valve 5 can be opened and closed smoothly, and the shutoff failure of the gate valve 5 can be prevented.
[0042]
【The invention's effect】
As described above, in the gate valve of the granular hopper according to the present invention, the lower end surface and the valve port of the outlet pipe are inclined with respect to the horizontal plane, and the valve plate has the lower end face of the outlet pipe and Since the valve plate is inserted and removed from the diagonally upward direction of the plate surface along the valve port, when the valve plate is moved in the valve opening direction, the valve is opened at the valve port edge while being urged by the pressure and weight of the granular material. The effect that powder particles are rubbed off from the plate, which prevents the powder particles from being caught between the lower end surface of the outlet pipe and the valve plate, and can be opened until it is fully opened. Can be obtained.
[0043]
Further, according to the present invention, since the upper surface of the valve plate is washed with the flow of the granular material when the valve is opened, the granular material is not deposited on the valve body during the valve opening, Can be prevented from adhering to the valve body.When the valve is opened, the granular material that has adhered to or accumulated on the valve body is 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 occurrence of a deadline or a deadline defect.
[0044]
Furthermore, according to the present invention, even if the granular material may stay or adhere to the upper surface of the valve plate when the valve is opened, the adhesion between the granular material and the valve plate in this case is weak. Therefore, by moving the valve plate in the valve closing direction, the granular material on the valve plate is scraped off at the lip of the valve port, and the granular material is placed between the lower end surface of the outlet pipe and the valve plate. Can be prevented, and the gate valve can be closed smoothly, and the valve can be reliably closed to the fully closed position.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of the present invention.
FIG. 2 is a perspective view of the outlet tube of the present invention.
FIG. 3 is a configuration diagram of a powder blending apparatus using the present invention.
[Explanation of symbols]
4 Hopper body 5 Gate valve 7 Lead pipe 8 Lower end surface 9 Valve port 10 Valve plate

Claims (2)

A lead-out pipe for deriving the powder from the hopper body that stores the powder, a valve port that is opened at the lower end of the lead-out pipe so as to cross the lead-out pipe, and a plate surface along the lower end surface of the lead-out pipe In a gate valve of a granular hopper comprising a valve plate that opens and closes the valve port by being inserted and removed in a direction,
The flow path in the outlet pipe is formed to taper from the upstream side of the valve port toward the valve port, and the cross-sectional area of the flow channel is reduced by half from the upstream side of the valve port to the valve port. The lower end surface of the outlet pipe and the valve port are inclined with respect to a horizontal plane, and the valve port is formed in a triangle rotated around one side so that the apex facing the one side is lowered, A gate valve for a granular hopper, wherein the valve plate is inserted and removed from a diagonally upward direction of the plate surface inclined along the lower end surface and the valve port of the outlet pipe. The said valve port is formed in the isosceles triangle, The gate valve of the granular material hopper of Claim 1 characterized by the above-mentioned.

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