JP3400745B2 - Double cut-off valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double cut-out valve which is small in size, has a simple structure, and can reliably seal materials.

[0002]

2. Description of the Related Art Conventionally, for example, a rotary valve has been used as a cut-out valve used for discharging dust in a chute collected by a dust collector or the like. A rotary valve is a sliding valve that uses a sliding surface of a rotating body to perform opening and closing operations, and is attached to the lower portion of a chute and rotated to cut out. By using the rotary valve, it was possible to cut out the depressurized dust collector from the outside by cutting it off.

[0003]

However, in the conventional rotary valve described above, in order to smoothly rotate the rotating body, it is necessary to preliminarily form a gap between the rotating body and the casing, which causes pressure leakage. The structure was apt to occur. Further, when the fluid in the chute is a harmful gas, there is a possibility that the harmful gas may leak to the outside, and there are many problems in the sealing property. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a double cut-out valve having a good sealing property.

[0004]

According to the present invention, there is provided a double cut-out valve having an upper chute having a circular discharge port at a lower end and a conical side surface having a lower end diameter larger than an inner diameter of the circular discharge port. Then, an upper valve body that moves up and down to open and close the circular discharge port, a lower chute that is disposed opposite to the lower chute with a gap and has a circular charging port at the upper end, and the upper end diameter is the circular shape. It has an inverted conical side surface that is larger than the inner diameter of the charging port,
A lower valve body that moves up and down to open and close the circular inlet, an intermediate hopper that connects the upper chute and the lower chute and has a space in which the upper valve body and the lower valve body move up and down, and the upper valve body. And an elevating means for moving the lower valve body up and down.

Here, the elevating means is, for example, a linearly moving actuator such as a screw jack, an electric cylinder, an air cylinder, a hydraulic cylinder, or a hydraulic motor,
A combination of an electric motor with a cam or crank mechanism is used. In addition to the side surface of the cone, the side surface of the cone is
Including the side of the truncated cone. The inverted conical side surface has a shape in which the conical side surface is turned upside down. Since the upper valve body and the lower valve body can be moved up and down by the elevating means, the circular discharge port and the circular input port can be surely closed.
Also, in the double cut-out valve according to the present invention, the elevating means is composed of a linear driving means provided above the upper chute, and its output shaft is provided with an upper stopper and a lower stopper, respectively, and the upper portion. A compression spring is connected to an elevating rod that penetrates the valve body and the lower valve body, and a compression spring is disposed between the upper valve body and the lower valve body that are inserted through the elevating rod. The circular outlet is closed by the body and the circular inlet is opened by the lower valve body, and the circular outlet is opened by the upper valve body and the circular inlet by the lower valve body by lowering the elevating rod. It is also possible to perform mouth closure. In this way, since the compression spring is arranged between the upper valve body and the lower valve body, it is possible to interlock a plurality of valve bodies with one elevating means.

Further, in the double cut-out valve according to the present invention, the ascending / descending means is composed of a linear drive means provided above the upper chute, and its output shaft is provided with an upper stopper and a lower stopper, respectively. A compression spring is arranged between the upper valve body and the lower valve body, which is connected to an elevating rod that penetrates the upper valve body and the lower valve body, and a compression spring is disposed between the upper valve body and the lower valve body that are inserted into the elevating rod. When the distance between the upper stopper and the upper end of the upper valve body at this time is a slide length S1 and the ascending stroke of the lower valve body is an ascending / descending stroke S2, S1> S2 may be satisfied. it can. The linear drive means means a device that performs linear reciprocating motion, such as a screw jack, an electric cylinder, an air cylinder, and a hydraulic cylinder. With this configuration, when operating the lift rod to move the upper valve body or the lower valve body,
It is possible to always close one of the circular outlet and the circular inlet. Here, the elevating rod may have a hollow structure, and air may be ejected from the inside of the elevating rod to prevent clogging of the material. With this configuration, it is possible to prevent the material from being clogged and to perform the operation smoothly. Also, the upper shoot,
It is also possible that the axis of the shaft is inclined with respect to the vertical direction, and the elevating means is provided above the circular discharge port of the upper chute so as to project outward from the upper chute. With this configuration, the lifting means can be attached regardless of the shape of the upper chute, and the lifting means can be easily maintained. Further, the upper chute is provided so as to be connected to a discharge port of a screw conveyor provided in a horizontal direction, the elevating means is provided above the discharge port, and the upper valve body is provided while avoiding a screw shaft of the screw conveyor. And may be connected to the lower valve body. With this structure, the lifting means can be mounted above the screw shaft to prevent the lifting means from being damaged by dust, and can be easily mounted on a commercially available screw conveyor.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. As shown in FIG. 1, the first aspect of the present invention
The double cut-out valve 10 according to the embodiment of the present invention has an upper chute 12 having a circular discharge port 11 at its lower end, and a conical side surface 13 whose lower end diameter is larger than the inner diameter of the circular discharge port 11, and moves up and down to form a circular shape. The upper valve body 14 that opens and closes the discharge port 11, the lower chute 17 that is disposed opposite to the upper chute 12 below the upper chute 12 with a gap 15 and has a circular charging port 16 at the upper end, and the circular charging port 16 that has a circular upper end diameter. A lower valve body 19 having an inverted conical side surface 18 larger than the inner diameter and moving up and down to open and close the circular inlet 16.
And an intermediate hopper 20 which connects the upper chute 12 and the lower chute 17 and has a space in which the upper valve body 14 and the lower valve body 19 move up and down, and an elevating means for vertically moving the upper valve body 14 and the lower valve body 19. The air cylinder 21, which is an example of (linear drive means), is provided. This allows the powder 26 to be cut out by a predetermined amount. The details will be described below.

The circular discharge port 11 of the upper chute 12 is provided so as to open vertically downward, and the upper chute 12 is provided with its axial center inclined with respect to the vertical direction except for the lower opening thereof. A flange 22 is provided on the upper end of the upper chute 12 and is connected to a flange 25a of a main body 25 such as a dust collector that discharges the powder 26 with a plurality of bolts 23 and nuts 24. The upper chute 12 has an outlet member 27 at its lower part. Main body of upper chute 12 and outlet member 2
7 are flanges 28 and 29 and a plurality of bolts 23, respectively.
Is fixed by. The circular outlet 11 is formed in the lower portion of the outlet member 27. The flange 20 a provided on the upper end of the substantially cylindrical intermediate hopper 20 is fixed to the flange 28 provided on the lower portion of the upper chute 12 with a plurality of bolts 23. In addition, the intermediate hopper 20
The side portion of is gradually reduced in diameter from the vicinity of the center and has a flange 32 at the lower end portion. The flange 32 of the intermediate hopper 20 is fastened and fixed to the flange 31 provided on the upper portion of the lower chute 17 forming the circular input port 16 by a plurality of bolts 23 and nuts 24, respectively. The lower side surface portion of the intermediate hopper 20 is gradually reduced in diameter downward and has an inverted conical side surface shape. Therefore, when the circular charging port 16 is opened, the powder 26 is easily dropped. There is.

The upper valve body 14 has a substantially frustoconical shape, and an elevating rod 34 is inserted through the center thereof. The periphery of the lower portion of the conical side surface 13 is sealed by a metal touch structure in which the inner corners of the circular discharge port 11 are in edge contact. Since the metal touch structure is used for sealing, the structure is simplified and the mechanical life is extended, and the edge-shaped abutment is used for sealing, so the bitten material can be cut off, causing trouble. Can be reduced. An inverted conical side surface 18 is provided at a lower portion of the lower valve body 19, and a conical side surface 33 having the same shape as the conical side surface 13 of the upper valve body 14 is provided at an upper portion thereof. Since the conical side surface 33 is provided, as shown in FIGS. 2 and 3, the powder 26 placed on the inclined surface portion of the conical side surface 33 falls outside the lower valve body 19 and the lower valve body 19 and the lifting rod. The powder 26 is prevented from being caught in a sliding portion between the powder 26 and the powder 34. Further, since the lower valve body 19 can be fitted inside the lower portion of the upper valve body 14, the minimum distance between the upper valve body 14 and the lower valve body 19 can be reduced, and the double cut-out valve 10 Can be miniaturized. It should be noted that the elevating rod has a hollow structure, and a plurality of holes are formed in its side part, and the holes are used to eject air from the inside of the elevating rod to prevent the material from being clogged. Is also possible.

The air cylinder 21 is provided above the circular outlet 11 of the upper chute 12 so as to project outward from the upper chute 12, and the output shaft 35 of the air cylinder 21 is fixed to the elevating rod 34 by a fixing means such as screwing. It is connected.
Above and below the lifting rod 34, upper stoppers 36,
A lower stopper 37 is provided, and the upper valve body 14 and the lower valve body 1 are provided.
The upper valve body 14 and the lower valve body 19 which are vertically urged by a compression spring 38 arranged in the middle of 9 are held so as not to move further up and down. here,
The positional relationship between the upper and lower stoppers 36, 37 and the upper valve body 14 and the lower valve body 19 will be described. As shown in Figure 1,
When the elevating rod 34 is in the neutral position, the upper valve body 14 and the lower valve body 19 are in close contact with the circular outlet 11 of the upper chute 12 and the circular inlet 16 of the lower chute 17, respectively. In this state, the upper stopper 3
6 and the upper end of the upper valve body 14, and between the lower stopper 37 and the lower end of the lower valve body 19, gaps L1 and L, respectively.
2 and the upper valve body 14 and the lower valve body 19 are in close contact with the circular discharge port 11 and the circular input port 16 only by the compression spring 38, respectively. As shown in FIG. 2, when the elevating rod 34 is lowered, the opening of the circular outlet 11 by the upper valve body 14 and the closing of the circular inlet 16 by the lower valve body 19 can be performed, and as shown in FIG. As the lifting rod 34 is raised, the upper valve body 14
The circular outlet 11 can be closed by the above, and the circular inlet 16 can be opened by the lower valve body 19.

As shown in FIG. 3, the distance between the upper stopper 36 and the upper end of the upper valve disc 14 when the elevating rod 34 is raised is set to a slide length S1, and the raising stroke of the lower valve disc 19 is increased or decreased. If S2, S1> S2
Have a relationship. In addition, as shown in FIG.
4 is lowered, the lower stopper 37 and the lower valve body 1
If the distance from the lower end of 9 is the slide length S3 and the descending stroke of the upper valve body 14 is the ascending / descending stroke S4, there is a relationship of S3> S4. S1-S2 = S3-S4
The difference is that the upper valve body 1 described with reference to FIG.
4 is equal to the sum L1 + L2 of the distances between the upper stopper 36 and the lower stopper 37 and the lower stopper 37. By preliminarily forming the gaps L1 and L2, when the lifting rod 34 is moved up and down, as shown in FIG.
Since the upper valve body 14 or the lower valve body 19 can securely close one of the corresponding circular discharge port 11 or circular input port 16 as shown in, the sealing performance can be improved. Further, the sealing is performed by the compression spring 38, and even when the machine stops due to a power failure or the like, the circular outlet 11
Alternatively, since either one of the circular charging ports 16 is always closed, no harmful gas leaks from the lower chute 17.

Next, the operating state of the double cut-out valve 10 will be described with reference to FIGS. As shown in FIG. 1, if the powder 26 falls inside the upper chute 12 when the circular outlet 11 is closed by the upper valve body 14, the powder 26 is blocked by the upper valve body 14. And stacked in the upper chute 12. Next, as shown in FIG. 2, when the air cylinder 21 is operated to lower the output shaft 35 and the elevating rod 34 connected to the output shaft 35, the upper stopper 36 provided on the upper part of the elevating rod 34 causes the upper stopper 36 to move to the upper valve. It contacts the upper end of the body 14 and pushes the upper valve body 14 downward. At this time, the lower valve body 19 receives a downward force from the upper valve body 14 via the compression spring 38, but the inverted conical side surface 18 fits into the circular insertion opening 16 of the lower chute 17 and moves further downward. Since it is not possible, lower valve body 1
9 is in a state where the circular insertion port 16 is still closed. Then, the lower stopper 37 provided at the lower part of the elevating rod 34 moves downward in a state of being separated from the lower valve body 19.

When the upper valve body 14 is pushed down and the circular outlet 11 is opened, the powder 26 drops into the intermediate hopper 20 along the conical side surface 13 of the upper valve body 14. At this time, since the circular charging port 16 is closed, the powder 26 is stored in the intermediate hopper 20 as it is. Next, the output shaft 35 of the air cylinder 21 and the lifting rod 34
2 is stopped and raised, only the upper valve body 14 is raised from the state shown in FIG. 2 with the circular inlet 16 being closed by the lower valve body 19. Then, the upper valve body 14 comes into contact with the circular discharge port 11 to close it, and subsequently, as shown in FIG. 3, the lower stopper 37 comes into contact with the lower end of the lower valve body 19 and pushes it up. At this time, the upper valve body 14 receives an upward force from the lower valve body 19 via the compression spring 38, but the conical side surface 13 is fitted into the circular discharge port 11 of the upper chute 12 and moves further upward. Therefore, the upper valve body 14 is in a state where the circular outlet 11 is kept closed. When the lower valve body 19 is pushed up and the circular charging port 16 is opened, the powder 26 falls along the conical side surface 33 of the lower valve body 19 and the side surface portion of the intermediate hopper 20 and is charged into the lower chute 17. . By repeating this procedure, it is possible to continuously cut out the powder 26 in a fixed amount in a surely sealed state.

Next, a double cut-out valve 40 according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. The double cut-out valve 40 has the same shape as the double cut-out valve 10 except for the shapes of the upper chute and the output shaft of the air cylinder. The same numbers are given and explanations are omitted.
An upper chute 41 of the double cut-out valve 40 is provided so as to be connected to a discharge port 43 of a screw conveyor 42 provided in a horizontal direction, and an air cylinder 44, which is an example of an elevating means (linear drive means), has a discharge port 43. Is connected to the elevating rod 34 on which the upper valve body 14 and the lower valve body 19 are attached while avoiding the screw shaft 46 of the screw conveyor 42. The details will be described below. The screw conveyor 42 has a casing 47 having a U-shaped cross section and an upper lid.
Is provided with a rotatable screw shaft 46, screws 48 and 49 are attached thereto, and a dust collecting fan 50 is provided at the end portion on the side of the discharge port 43. The direction of the rotary blades of the screw 49 is opposite to the direction of the rotary blades of the screw 48, and dust such as dust collected at the end of the screw conveyor 42 by the dust collecting fan 50 is transferred to the screw 4
It is configured to be dropped into the discharge port 43 at 9.

An opening 51 is formed above the discharge port 43 of the screw conveyor 42, and an air cylinder 44 is attached to the opening 51 via a length adjusting member 51a. On the output shaft 45 of the air cylinder 44, the respective upper portions of the avoidance brackets 52 and 53 standing upright on the left and right of the screw shaft 46 are attached via attachment members 46a. The lower part is connected to the elevating rod 34 via a mounting member 53a. Since the avoidance brackets 52 and 53 are attached with a sufficient gap formed in the vertical direction of the screw shaft 46, they do not collide with the screw shaft 46 even if the air cylinder 44 is started and moved vertically. . In addition,
The other structure and operation of the double cut-out valve 40 are substantially the same as those of the double cut-out valve 10 described in the first embodiment, and the description thereof will be omitted. Although the embodiments according to the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, in the present embodiment, an air cylinder is used as the lifting means. However, in addition to this, linear driving means such as a screw jack, an electric cylinder, and a hydraulic cylinder can also be used. Also, the side surfaces of the upper and lower valve bodies are conical or inverted conical, but they can also be spherical so that a gap is created even when the closing angle deviates due to an air cylinder installation error or the like. Can be sealed without. In addition, a circular outlet,
Also, the sealing of the circular insertion port is performed by the metal touch structure, but rubber or plastic for sealing may be laid at the contacting portions. Further, it is possible to adhere a resin sheet having lubricity to the sliding surfaces of the intermediate hopper and the upper and lower valve bodies to smoothly drop the powder.

[0016]

In a double cut valve of claims 1 to 5, wherein according to the present invention, since it is possible to vertically moving the upper valve member and the lower valve body with lifting means, it can be made compact size, also, Since the moving direction of the upper valve body and the lower valve body is the same as the moving direction of the powder, it is possible to reduce failures due to biting. Particularly, in the double cut-out valve according to claim 1 , since the compression spring is arranged between the upper valve body and the lower valve body, it is possible to interlock a plurality of valve bodies with one elevating means. . In the double cut-out valve according to claim 2 , since the slide length S1 of the elevating rod is larger than the elevating stroke S2 of the valve body, one valve body moves up and down before the other valve body opens. Since the other chute is slid and the other chute is closed, a reliable seal can be made, and the spring has a seal structure, so there are few failures. In the double cut-out valve according to the third aspect , since the inside of the lifting rod has a hollow structure and air can be jetted from the inside to prevent the material from being clogged, maintenance work can be omitted. Claim
In the double cut-out valve described in 4 , the elevating means can be attached so as to project outward from the inclined upper chute, so that the elevating means need not be inclined and attached, and the manufacturing is simplified. Further, in the double cut-out valve according to the fifth aspect , since the elevating means can be provided at a position avoiding the screw shaft of the screw conveyor, the manufacture and mounting of the double cut-out valve can be simplified.

[Brief description of drawings]

FIG. 1 is a front sectional view of a double cut-out valve according to a first embodiment of the present invention.

FIG. 2 is a front sectional view of the double cut-out valve when a lifting rod is lowered.

FIG. 3 is a front cross-sectional view of the double cut-out valve when a lifting rod is lifted.

FIG. 4 is a front sectional view of a double cutout valve according to a second embodiment of the present invention.

FIG. 5 is a side sectional view of the same.

[Explanation of symbols]

10: double cut-out valve, 11: circular discharge port, 12: upper chute, 13: conical side face, 14: upper valve body, 15: gap, 16: circular input port, 17: lower chute, 18: reverse conical side face, 19: Lower valve body, 20: Intermediate hopper, 20
a: flange, 21: air cylinder (elevating means), 2
2: flange, 23: bolt, 24: nut, 25: body part, 25a: flange, 26: powder, 27: outlet member, 28, 29: flange, 31, 32: flange, 3
3: conical side surface, 34: lifting rod, 35: output shaft, 3
6: Upper stopper, 37: Lower stopper, 38: Compression spring, 40: Double cut-out valve, 41: Upper chute, 4
2: screw conveyor, 43: discharge port, 44: air cylinder, 45: output shaft, 46: screw shaft, 46a:
Mounting member, 47: Casing, 48, 49: Screw, 50: Dust collecting fan, 51: Opening portion, 51a: Length adjusting member, 52, 53: Avoidance bracket, 53a: Mounting member

Claims (5)

(57) [Claims] 1. An upper chute having a circular discharge port at a lower end, an upper valve body having a conical side surface having a lower end diameter larger than an inner diameter of the circular discharge port, and moving up and down to open and close the circular discharge port. The lower chute is disposed below the upper chute with a gap and has a circular charging port at the upper end, and has an inverted conical side surface having an upper end diameter larger than the inner diameter of the circular charging port, and is vertically moved. A lower valve body that opens and closes a circular inlet, an intermediate hopper that connects the upper chute and the lower chute, and has a space in which the upper valve body and the lower valve body move up and down; and the upper valve body and the lower valve body. possess an elevating means for vertically moving, moreover, the lifting means disposed above the upper chute linear
It consists of driving means, and its output shaft is up and down respectively.
Upper and lower stoppers are provided with the upper valve body and the lower valve body
Connected to the lifting rod that penetrates the
A compression spring is provided between the upper valve body and the lower valve body.
Is arranged, and the upper part is lifted by the lifting rod.
The circular outlet is closed by the valve body and the lower valve body is closed.
Open the circular inlet and lower the lifting rod.
And the opening of the circular outlet by the upper valve body
And a double cut-out valve, wherein the circular inlet is closed by the lower valve body . 2.Upper chute with circular outlet at the bottom
When, Has a conical side surface with a lower end diameter larger than the inner diameter of the circular outlet.
And an upper valve body that moves up and down to open and close the circular outlet, The upper chute is arranged facing each other with a gap below the upper chute.
A lower chute with a circular slot at the end, If the upper end diameter is larger than the inner diameter of the circular inlet,
And a lower valve body that moves up and down to open and close the circular inlet, The upper valve body is connected to the upper chute and the lower chute.
And the lower valve body moves up and down Intermediate hopper with space
When, Elevating means for vertically moving the upper valve body and the lower valve body,
Have, and The elevating means is a straight line provided above the upper chute.
It consists of driving means, and its output shaft is up and down respectively.
Upper and lower stoppers are provided with the upper valve body and the lower valve body
Connected to the lifting rod that penetrates the
A compression spring is provided between the upper valve body and the lower valve body.
Is placed, and when the lifting rod is raised
Adjust the distance between the upper stopper and the upper end of the upper valve disc.
Ride length S1 and the rising stroke of the lower valve body
S1> S2 when the lifting stroke is S2
A double cut-off valve. 3. The double cut-out valve according to claim 1 , wherein the elevating rod has a hollow structure, and air is ejected from the inside of the elevating rod to prevent material clogging. Double cutout valve. 4. The double cutout valve according to any one of claims 1 to 3 , wherein the upper chute is provided with its axis inclined with respect to the vertical direction, and the elevating means is provided on the upper chute. A double cut-out valve which is provided above the circular discharge port and is provided so as to project outward from the upper chute. 5. A double cut valve according to any one of claims 1 to 3, wherein the chute, provided connected to the outlet of the screw conveyor which is provided in a horizontal direction, said elevation means Is a double cut-off valve, which is connected to the upper valve body and the lower valve body above the discharge port while avoiding the screw shaft of the screw conveyor.