JP7343887B2 - Opening/closing valve device for powder and granular materials - Google Patents

Description

The present invention relates to an on-off valve device for powder and granular materials.

2. Description of the Related Art Conventionally, there has been known an on-off valve device for powder and granular material that is provided in a transport path for transporting a fixed amount of powder and granular material at least in a downward direction. For example, the on-off valve device for powder and granular material described in Patent Document 1 includes a connecting pipe connected to the lower part of the drying hopper and extending diagonally downward, and a valve body that opens and closes the outlet of the connecting pipe. It is composed of a cylinder that moves the valve body toward the outlet.

Patent No. 5130338

However, in the case of the on-off valve device for powder and granular material described in Patent Document 1, in order to prevent the powder and granular material from being caught between the connection pipe and the valve body, the valve body is located at the outlet of the connection pipe. is not closed. That is, a gap is formed between the connecting pipe and the valve body to the extent that the powder cannot pass therethrough. Therefore, the high-temperature gas supplied to the drying hopper for drying the powder and granular material leaks through the gap.

Further, even if the on-off valve is used when the hopper is used for transportation, if the airtightness cannot be maintained due to jamming, this may cause transportation failure. Even in containers for powder or granular materials used for other purposes, there may be a problem that the on-off valve does not close completely when the density or pressure of the gas inside the container needs to be controlled.

SUMMARY OF THE INVENTION Therefore, the present invention provides an on-off valve device for powder and granular material, in which the outlet of the connecting pipe is opened to the valve while suppressing the powder and granular material from being caught between the valve element and the connecting pipe connected to a hopper. The challenge is to close it with the body.

In order to solve the above technical problem, according to one aspect of the present invention,
a connecting pipe having an inlet through which the granular material flows and an outlet opening at least downwardly through which the granular material flows out;
a cylindrical body provided in the connecting pipe so that the downstream end can be inserted into and taken out of the connecting pipe, the cylinder body comprising an upstream end provided with an upstream opening and a downstream end provided with a downstream opening;
a valve body that opens and closes the outlet;
a valve body moving mechanism that moves the valve body forward and backward in the opening direction of the outlet;
By moving the valve body toward the outlet by the valve body moving mechanism, the valve body first contacts the downstream end of the cylinder body to close the downstream opening, and then moves together with the cylinder body. An on-off valve device for powder and granular material is provided that closes the outlet.

According to the present invention, in the on-off valve device for powder and granular materials, the outlet of the connecting pipe is opened to the valve while suppressing the powder and granular material from being caught between the valve body and the connecting pipe connected to a hopper, etc. Can be closed by the body.

A diagram schematically showing an on-off valve device for powder and granular material according to Embodiment 1 of the present invention. Cross-sectional view of on-off valve device for powder and granular materials Perspective view of a cylinder in an on-off valve device for powder and granular materials Diagram showing the valve closing operation of the on-off valve device for powder and granular materials Diagram showing the valve closing operation following FIG. 4A Diagram showing the valve closing operation following FIG. 4B Diagram showing the state in which the valve closing operation is completed A diagram schematically showing an on-off valve device for powder and granular material according to Embodiment 2 of the present invention A perspective view of a cylindrical body in an on-off valve device for powder and granular material according to Embodiment 3 of the present invention A perspective view of a cylindrical body in an on-off valve device for powder and granular material according to Embodiment 4 of the present invention A diagram schematically showing an on-off valve device for powder and granular material according to Embodiment 5 of the present invention A diagram schematically showing an on-off valve device for powder and granular material according to Embodiment 6 of the present invention A diagram schematically showing an on-off valve device for powder and granular material according to Embodiment 7 of the present invention

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram schematically showing an on-off valve device for powder and granular material according to Embodiment 1 of the present invention. FIG. 2 is a sectional view of an on-off valve device for powder and granular materials. Note that the XYZ coordinate system shown in the figure is for facilitating understanding of the embodiments of the present invention, and is not intended to limit the invention. Further, the X-axis direction and the Y-axis direction indicate the horizontal direction, and the Z-axis direction indicates the vertical direction.

As shown in FIG. 1, an on-off valve device 10 for powder or granular material according to the first embodiment is arranged on a transport path along which powder or granular material such as resin pellets used in resin molding is transported. In the case of the first embodiment, the on-off valve device 10 includes a drying hopper 50 that stores powder and granules and dries the stored powder and granules with high-temperature gas, and a conveyor pipe that connects to a resin molding machine (not shown). 52.

As shown in FIG. 2, the on-off valve device 10 for powder and granular material according to the first embodiment includes a housing 12, an upstream connecting pipe 14 connected to a drying hopper 50, and a downstream connecting pipe 14 connected to a conveying pipe 52. It has a side connecting pipe 16. Note that in this specification, "upstream side" and "downstream side" are based on the moving direction (conveyance direction) of the powder or granular material.

As shown in FIG. 2 , the upstream connecting pipe 14 is, for example, a circular pipe made of metal, and includes an inlet 14 a connected to the drying hopper 50 and an outlet 14 b that opens within the housing 12 . Further, the downstream connecting pipe 16 is, for example, a circular pipe made of metal, and includes an inlet 16 a that opens inside the housing 12 and an outlet 16 b that is connected to the conveying pipe 52 .

Further, as shown in FIG. 2, the outlet 14b of the upstream connecting pipe 14 opens diagonally downward. That is, the opening center line C, which is perpendicular to the plane containing the outlet 14b and passes through the center of the outlet 14b, extends diagonally downward. An inlet 16a of the downstream connecting pipe 16 is arranged below the outlet 14b of the upstream connecting pipe 14. Therefore, the powder flows out into the housing 12 from the outlet 14b of the upstream connecting pipe 14, and then flows downstream from the housing 12 through the inlet 16a of the downstream connecting pipe 16, as shown by the two-dot chain line. It flows into the side connecting pipe 16.

The on-off valve device 10 for powder and granular material also includes a valve body 18 that opens and closes the outlet 14b of the upstream connecting pipe 14, and a valve body 18 that opens and closes the outlet 14b of the upstream connecting pipe 14, and the valve body 18 in the opening direction of the outlet 14b (that is, the extending direction of the opening center line C). It has a valve body moving mechanism 20 that moves the valve body forward and backward.

In the case of the first embodiment, the valve body 18 is a disc-shaped valve body having a planar contact surface 18a that contacts the upstream connecting pipe 14. When the granular material is a hard substance, the valve body 18 is preferably made of a metal material in consideration of wear caused by contact between the granular material and the granular material. As a result, the metal upstream connecting pipe 14 and the valve body 18 come into metal contact, suppressing mutual wear, and extending the life of the powder on-off valve device 10 (at least one is made of a resin material or the like). compared to those made from non-metallic materials).

The valve body moving mechanism 20 is, for example, an air cylinder, and includes a rod 20a that moves forward and backward in the direction in which the opening center line C extends. A valve body 18 is attached to the tip of the rod 20a. Further, the valve body moving mechanism 20 is provided in the housing 12 so that the valve body 18 faces the outlet 14b of the upstream connecting pipe 14 in the extending direction of the opening center line C. As a result, the valve body moving mechanism 20 moves the valve body 18 forward toward the outlet 14b of the upstream connecting pipe 14, so that the valve body 18 comes into contact with the upstream connecting pipe 14 and closes the outlet 14b. Furthermore, the valve body moving mechanism 20 moves back the valve body 18 with the outlet port 14b closed, so that the outlet port 14b of the upstream connecting pipe 14 is opened.

The on-off valve device 10 for powder and granular material further includes a cylindrical body 22 in order to suppress the occurrence of biting of the powder and granular material between the upstream connecting pipe 14 and the valve body 18 .

In the case of the first embodiment, if particles are caught between the upstream connecting pipe 14 and the valve body 18, the outlet 14b of the upstream connecting pipe 14 cannot be completely closed. As a result, the high temperature gas in the drying hopper 50 will leak out through the outlet 14b which is not completely closed. In order to suppress the occurrence of such biting of powder or granular material, the on-off valve device 10 for powder or granular material has a cylindrical body 22.

FIG. 3 is a perspective view of a cylinder in the on-off valve device for powder and granular material according to the first embodiment.

As shown in FIG. 3, the cylinder 22 has a substantially cylindrical shape and includes an upstream end 22b provided with an upstream opening 22a and a downstream end 22d provided with a downstream opening 22c. .

As shown in FIG. 2, the cylindrical body 22 is provided in the upstream connecting pipe 14 so that its downstream end 22d can be taken in and out of the upstream connecting pipe 14. Specifically, in the case of the first embodiment, the cylindrical body 22 is movable in the opening direction of the outlet 14b of the upstream connecting pipe 14 (extending direction of the opening center line C). is housed within. That is, the outer diameter of the cylindrical body 22 is smaller than the inner diameter of the upstream connecting pipe 14. Therefore, as shown in FIG. 2, when the cylindrical body 22 is in a natural state without receiving any external force, its downstream end 22d is located outside the upstream connecting pipe 14 due to its own weight.

The upstream connecting tube 14 is provided with a plurality of convex stoppers 14d protruding from its inner peripheral surface 14c so that the cylinder 22 does not fall off from the upstream connecting tube 14 due to its own weight. On the other hand, as shown in FIG. 3, the cylindrical body 22 is formed with a shoulder portion 22e that comes into contact with a plurality of stoppers 14d of the upstream connecting pipe 14 to restrict downward movement. That is, the cylindrical body 22 includes a large diameter part 22f on the upstream side and a small diameter part 22g on the downstream side, and a shoulder part 22e is formed between the large diameter part 22f and the small diameter part 22g.

Note that the embodiment of the present invention does not limit the form of the stopper 14d that prevents the cylindrical body 22 from falling off from the upstream connecting pipe 14. However, the stopper 14d is not a single protrusion (i.e. an annular protrusion) continuously provided in the circumferential direction on the inner peripheral surface 14c of the upstream connecting pipe 14, but a plurality of intermittently provided in the circumferential direction. Preferably, it is a protrusion. Although the granular material passes through the inside of the cylindrical body 22, fine powder adhering to the granular material may enter the gap between the inner circumferential surface 14c of the upstream connecting pipe 14 and the cylindrical body 22. The stopper 14d is provided intermittently in the circumferential direction with respect to the inner peripheral surface 14c of the upstream connecting pipe 14 so that the fine powder can escape through the gap, that is, so that the stopper 14d does not restrict the movement of the fine powder. Preferably, it is a plurality of raised protrusions.

The mechanism by which the cylindrical body 22 prevents particles from being caught between the upstream connecting pipe 14 and the valve body 18 will be described with reference to FIGS. 4A to 4D.

4A to 4D are diagrams showing the valve closing operation of the on-off valve device for powder and granular material. In particular, FIG. 4D shows a state in which the valve closing operation is completed.

As shown in FIG. 4A, when the valve closing operation of the on-off valve device 10 for powder and granular material is started, first, the rod 20a of the valve body moving mechanism 20 moves forward, thereby causing the valve attached to the tip of the rod 20a to move forward. The valve body 18 moves toward the outlet 14b of the upstream connecting pipe 14. At this time, the valve body moving mechanism 20 moves the valve body 18 at the first speed V1.

As shown in FIG. 4B, before contacting the upstream connecting pipe 14, the contact surface 18a of the valve body 18 contacts the downstream end 22d of the cylindrical body 22, closing the downstream opening 22c of the cylindrical body 22. . As a result, transportation of the powder from the upstream connecting pipe 14 to the downstream connecting pipe 16 is stopped. Note that, at this time, powder may be caught between the valve body 18 and the cylindrical body 22, but this is not a problem (the reason for this will be described later).

As shown in FIG. 4C, in the case of the first embodiment, the valve body moving mechanism 20 moves the valve body at a second speed V2, which is lower than the first speed, after the valve body 18 contacts the cylinder body 22. Move the body 18. That is, the valve body moving mechanism 20 moves the valve body 18 while maintaining contact between the valve body 18 and the cylinder body 22 (in a state where the valve body 18 closes the downstream opening 22c of the cylinder body 22).

The reason for decelerating from the first speed V1 to the second speed V2 is that before the valve body 18 and the upstream connecting pipe 14 come into contact (before the valve body 18 closes the outlet 14b of the upstream connecting pipe 14). This is to ensure time for the particulate material resting on the contact surface 18a of the valve body 18 on the outside of the cylinder 22 to fall from the valve body 18. In other words, if the valve body 18 comes into contact with the upstream connecting pipe 14 and the cylinder body 22 at approximately the same time, there is a possibility that particulate matter will be caught between the upstream connecting pipe 14 and the valve body 18. Because there is. Note that the first speed V1 is preferably as high as possible in order to quickly complete the valve closing operation. Further, the timing of deceleration from the first speed V1 to the second speed V2, that is, the timing of occurrence of contact between the valve body 18 and the cylinder body 22, can be known by detecting the stroke amount of the rod 20a, for example. However, the first speed V1 does not necessarily have to be high, and may be changed as appropriate as long as the second speed V2 is high enough not to cause biting of the powder or granules. For example, the first speed V1 and the second speed V2 may be the same.

Finally, as shown in FIG. 4D, the valve body 18 maintains contact with the cylindrical body 22, and the contact surface 18a of the valve body 18 is maintained in contact with the cylindrical body 22, and the contact surface 18a is It contacts the upstream connecting pipe 14. Thereby, the valve element 18 can close the outlet 14b of the upstream connecting pipe 14 in a state where no particulate material is caught between the upstream connecting pipe 14 and the valve element 18.

As shown in FIG. 4D, when the valve body 18 and the upstream connecting pipe 14 come into contact, the valve closing operation is completed, and the transportation of the powder from the upstream connecting pipe 14 to the downstream connecting pipe 16 is maintained in a stopped state. be done.

As described above, according to the first embodiment, in the on-off valve device for powder and granular material, the connection pipe is The outlet can be closed by a valve body.

(Embodiment 2)
The second embodiment is substantially the same as the first embodiment described above, except for the upstream connecting pipe and the valve body. Therefore, the on-off valve device for powder and granular material according to the second embodiment will be described with a focus on the upstream connecting pipe and the valve body.

FIG. 5 schematically shows an on-off valve device for powder and granular material according to Embodiment 2 of the present invention.

As shown in FIG. 5, in the powder on-off valve device 110 according to the second embodiment, the outlet 114b of the upstream connecting pipe 114 is the same as the upstream connecting pipe in the first embodiment shown in FIG. Unlike the outlet 14b of No. 14, it faces downward.

Therefore, the valve body 118 that closes the outlet 114b of the upstream connecting pipe 114 has a conical contact surface with the apex facing upward, unlike the valve body 18 in the first embodiment shown in FIG. 118a. As a result, the powder particles do not stay on the contact surface 118a of the valve body 118, but move toward the downstream side in the conveyance direction.

Similar to the first embodiment described above, the present second embodiment also suppresses particles from being caught between a connecting pipe connected to a hopper or the like and a valve body in an on-off valve device for powder or granules. In this state, the outlet of the connecting pipe can be closed by the valve body.

(Embodiment 3)
The third embodiment is substantially the same as the first embodiment described above, except for the cylinder. Therefore, the on-off valve device for powder and granular material according to the third embodiment will be described with a focus on the cylindrical body.

FIG. 6 is a perspective view of a cylindrical body in an on-off valve device for powder and granular material according to Embodiment 3 of the present invention.

As shown in FIG. 6, the cylinder body 222 in the on-off valve device for powder and granular material according to the third embodiment has a substantially cylindrical shape, and has an upstream end 222b provided with an upstream opening 222a; and a downstream end 222d provided with a downstream opening 222c. Further, the cylindrical body 222 is formed with a shoulder portion 222e that contacts a plurality of stoppers of the upstream connecting pipe to restrict downward movement. That is, the cylindrical body 222 includes a large diameter portion 222f on the upstream side and a small diameter portion 222g on the downstream side, and a shoulder portion 222e is formed between the large diameter portion 222f and the small diameter portion 222g. Further, in the cylinder 222, a plurality of flange portions 222h that are continuous in the circumferential direction are formed on the outer peripheral surface of the large diameter portion 222f.

The plurality of flange portions 222h are guided by the inner peripheral surface of the upstream connecting pipe. The plurality of flange portions 222h also play a role of reducing the contact area of the cylinder 222 with the inner circumferential surface of the upstream connecting pipe, that is, a role of reducing the frictional force generated between the upstream connecting pipe and the cylinder 222. do.

Note that the number of flange portions 222h is not limited to two, and may be one. In order to suppress rattling of the cylindrical body 222 within the upstream connecting pipe, the number of flange portions 222h is preferably two or more.

Similar to the first embodiment described above, the present third embodiment also suppresses particles from getting caught between a connecting pipe connected to a hopper or the like and a valve body in an on-off valve device for powder and granules. In this state, the outlet of the connecting pipe can be closed by the valve body.

(Embodiment 4)
This Embodiment 4 is substantially the same as the above-described Embodiment 1 except for the cylinder. Therefore, the on-off valve device for powder and granular material according to the fourth embodiment will be described with a focus on the cylindrical body.

FIG. 7 is a perspective view of a cylindrical body in an on-off valve device for powder and granular material according to Embodiment 4 of the present invention.

As shown in FIG. 7, the cylindrical body 322 in the on-off valve device for powder and granular material according to the fourth embodiment has a substantially cylindrical shape, and has an upstream end 322b provided with an upstream opening 322a; A downstream end 322d is provided with a downstream opening 322c. Further, the cylindrical body 322 is formed with a shoulder portion 322e that contacts a plurality of stoppers of the upstream connecting pipe to restrict downward movement. That is, the cylindrical body 322 includes a large diameter part 322f on the upstream side and a small diameter part 322g on the downstream side, and a shoulder part 322e is formed between the large diameter part 322f and the small diameter part 322g. Further, in the cylinder 322, a plurality of protrusions 322h are formed on the outer circumferential surface of the large diameter portion 322f, which are separated into upstream and downstream sides and are provided intermittently in the circumferential direction.

From another perspective, the plurality of protrusions 322h are configured by forming a plurality of grooves extending from the upstream end 322b toward the downstream end 322d in a flange portion continuous in the circumferential direction.

The plurality of protrusions 322h are guided by the inner circumferential surface of the upstream connecting pipe, similar to the flange portion 222h of the third embodiment described above. The plurality of protrusions 322h also play a role of reducing the contact area of the cylinder 322 with the inner circumferential surface of the upstream connecting pipe, that is, a role of reducing the frictional force generated between the upstream connecting pipe and the cylinder 322. do. Furthermore, even if fine powder adhering to the powder particles enters the gap between the inner peripheral surface of the upstream connecting pipe and the cylindrical body 322, the fine powder will be removed from the plurality of protrusions, unlike in the case where a flange is provided. It is easy to slip out of the gap between the upstream connecting pipe and the cylindrical body 322 through the space between 322h and 322h.

Similar to the first embodiment described above, this fourth embodiment also suppresses particles from being caught between a connecting pipe connected to a hopper or the like and a valve body in an on-off valve device for powder or granules. In this state, the outlet of the connecting pipe can be closed by the valve body.

(Embodiment 5)
In the case of the first to fourth embodiments described above, when the cylinder housed in the upstream connecting pipe is not in contact with the valve body, its downstream end is located outside the upstream connecting pipe due to its own weight. . Embodiment 5 is a different method, in which the downstream end of the cylinder is located outside the upstream connecting pipe. Embodiment 5 will be described with a focus on this different point.

FIG. 8 schematically shows an on-off valve device for powder and granular material according to Embodiment 5 of the present invention.

As shown in FIG. 8, in the powder flow on-off valve device 410 according to the fifth embodiment, the cylinder body 422 is moved toward the outlet port 414b of the upstream connecting pipe 414 by a biasing member 424 such as a disc spring. is energized. As a result, the downstream end 422d (ie, the downstream opening 422c) of the cylindrical body 422 is located outside the upstream connecting pipe 414. When pushed by the valve body against the biasing force of the biasing member 424, the downstream end 422d of the cylinder body 422 moves into the upstream connecting pipe 414. In the case of the fifth embodiment, a circumferential groove 414d for accommodating the biasing member 424 is formed on the inner circumferential surface 414c of the upstream connecting pipe 414, and the flange portion 422h for receiving the biasing member 424 is formed on the cylindrical body 422. It is set in.

Similarly to the first embodiment described above, in the fifth embodiment, in the on-off valve device for powder and granule, it is possible to suppress the powder and granule from being caught between the connecting pipe connected to the hopper and the like and the valve body. In this state, the outlet of the connecting pipe can be closed by the valve body.

(Embodiment 6)
In the first to fifth embodiments described above, the cylindrical body is housed in the upstream connecting pipe such that its downstream end can be moved in and out of the upstream connecting pipe, and the entire body is movable. Unlike this, in the sixth embodiment, the entire cylinder is not movably housed within the upstream connecting pipe. Embodiment 6 will be described with a focus on this different point.

FIG. 9 schematically shows an on-off valve device for powder and granular material according to Embodiment 6 of the present invention.

As shown in FIG. 9, in the on-off valve device 510 for powder and granular material according to the sixth embodiment, the upstream end 522b of the cylindrical body 522 is fixed to the upstream connecting pipe 514. Therefore, the cylindrical body 522 cannot move within the upstream connecting pipe 514.

Instead of being immovable, the barrel 522 is made from an elastic material such as rubber. When the cylindrical body 522 is in its natural state (that is, when it is not in contact with the valve body and its downstream opening 522c is open), its downstream end 522d is located outside the upstream connecting pipe 514. .

The cylindrical body 522 is pushed by the valve body and elastically deforms in the opening direction of the outlet 514b of the upstream connecting pipe 514 (extending direction of the opening center line C), that is, in the compression direction. Thereby, the downstream end 522d of the cylindrical body 522 moves into the upstream connecting pipe 514.

Similarly to Embodiment 1 described above, this sixth embodiment also suppresses particles from getting caught between a connecting pipe connected to a hopper or the like and a valve body in an on-off valve device for powder and granules. In this state, the outlet of the connecting pipe can be closed by the valve body.

(Embodiment 7)
In the seventh embodiment, the upstream end of the cylindrical body is fixed to the upstream connecting pipe as in the sixth embodiment described above. However, in a different way, the downstream end of the cylinder can be moved in and out of the upstream connecting pipe. Embodiment 7 will be described with a focus on this different point.

FIG. 10 schematically shows an on-off valve device for powder or granular material according to Embodiment 7 of the present invention.

As shown in FIG. 10, in the on-off valve device 610 for powder and granular material according to the sixth embodiment, the upstream end 622b of the cylindrical body 622 is fixed to the upstream connecting pipe 614. Therefore, the cylindrical body 622 cannot move within the upstream connecting pipe 614.

Instead of being immovable, the cylindrical body 622 is made of a material such as a resin material or rubber, and has a bellows shape that can be compressed and deformed in the opening direction of the outflow port 614b of the upstream connecting pipe 614 (extending direction of the opening center line C). is formed. When the cylindrical body 622 is in its natural state (that is, when it is not in contact with the valve body and its downstream opening 622c is open), its downstream end 622d is located outside the upstream connecting pipe 614. .

The cylinder body 622 is pushed by the valve body and elastically deforms in the opening direction of the outlet 614b of the upstream connecting pipe 614 (the direction in which the opening center line C extends), that is, in the compression direction. Thereby, the downstream end 622d of the cylindrical body 622 moves into the upstream connecting pipe 614.

Similarly to Embodiment 1 described above, this seventh embodiment also suppresses particles from being caught between a connecting pipe connected to a hopper or the like and a valve body in an on-off valve device for powder or granules. In this state, the outlet of the connecting pipe can be closed by the valve body.

Although the present invention has been described above with reference to a plurality of Embodiments 1 to 7, the embodiments of the present invention are not limited to these. For example, it will be appreciated by those skilled in the art that at least one embodiment can be combined in whole or in part with at least a portion of the embodiments described above to provide further embodiments of the present invention. it is obvious.

That is, in a broad sense, the on-off valve device for powder and granular material according to the embodiment of the present invention is a connection that includes an inlet through which the powder and granular material flows and an outlet that opens at least downward and through which the powder and granular material flows out. a tube, an upstream end provided with an upstream opening, and a downstream end provided with a downstream opening, the tube provided in the connecting pipe such that the downstream end can be inserted into and taken out of the connecting pipe; a valve body that opens and closes the outlet, and a valve body moving mechanism that moves the valve body forward and backward in the opening direction of the outlet, and the valve body is moved by the valve body moving mechanism to open and close the outlet. By moving towards the cylinder, it first contacts the downstream end of the cylinder to close the downstream opening, and then moves together with the cylinder to close the outlet.

Further, the on-off valve device for powder and granular material according to the embodiment of the present invention is applicable not only to a drying hopper that stores powder and granular material and dries it with high-temperature gas, but also to a transportation hopper that requires airtightness for transporting powder and granular material, for example. may be connected to. That is, on a conveyance path where it is necessary to selectively convey the powder or granular material, an on-off valve device for the powder or granular material may be installed as a means for realizing the selective transportation.

INDUSTRIAL APPLICATION This invention is applicable to the opening-and-closing valve apparatus installed in the conveyance path which conveys powder and granular materials.

10 Opening/closing valve device 14 Connecting pipe (upstream connecting pipe)
14a Inflow port 14b Outflow port 18 Valve body 20 Valve body movement mechanism 22 Cylindrical body 22a Upstream opening 22b Upstream end 22c Downstream opening 22d Downstream end

Claims (10)

a connecting pipe having an inlet through which the granular material flows and an outlet opening at least downwardly through which the granular material flows out;
a cylindrical body provided in the connecting pipe so that the downstream end can be inserted into and taken out of the connecting pipe, the cylinder body comprising an upstream end provided with an upstream opening and a downstream end provided with a downstream opening;
a valve body that opens and closes the outlet;
a valve body moving mechanism that moves the valve body forward and backward in the opening direction of the outlet;
By moving the valve body toward the outlet by the valve body moving mechanism, the valve body first contacts the downstream end of the cylinder body to close the downstream opening, and then moves together with the cylinder body. closing the outlet ;
The cylindrical body is housed within the connecting pipe so as to be movable in the opening direction,
The cylindrical body includes at least one flange portion guided by an inner circumferential surface of the connecting pipe,
An on-off valve device for powder and granular material, wherein at least one groove extending from the upstream end toward the downstream end is formed in the flange portion of the cylindrical body.
The on-off valve device for powder and granular material according to claim 1 , further comprising a biasing member that biases the cylindrical body toward the outlet.
The on-off valve device for powder and granular material according to claim 1 or 2 , wherein the cylinder body and the valve body are made of a metal material.
The on-off valve device for powder and granular material according to claim 1, wherein the cylindrical body is elastically deformable and has an upstream end fixed to the connecting pipe.
The on-off valve device for powder or granular material according to claim 4 , wherein the cylinder is made of an elastic material.
The outlet of the connecting pipe opens diagonally downward,
The on-off valve device for powder and granular material according to any one of claims 1 to 5 , wherein a contact surface of the valve body that contacts the connecting pipe is planar.
an outlet of the connecting pipe opens downward;
The on-off valve device for powder and granular material according to any one of claims 1 to 5 , wherein a contact surface of the valve body that contacts the connecting pipe has a conical shape.
The valve body moving mechanism moves the valve body at a first speed until it contacts the cylindrical body, and moves the valve body at a first speed lower than the first speed after contacting the cylindrical body. The on-off valve device for powder and granular material according to any one of claims 1 to 7 , which is moved at a speed of 2.
The on-off valve device for powder and granular materials according to any one of claims 1 to 8 , wherein the inlet of the connecting pipe is connected to a drying hopper that accommodates the powder and granules and dries them using high-temperature gas.
The on-off valve device for powder and granular material according to any one of claims 1 to 8 , wherein the inlet of the connecting pipe is connected to a transport hopper that transports the powder and granular material.

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