JP6058971B2 - On-off valve mechanism - Google Patents

Description

  The present invention relates to an on-off valve mechanism that moves a shaft member connected to a valve body in an axial direction to open and close an opening formed in a wall body by the valve body.

  As an open / close valve mechanism for moving the shaft member connected to the valve body in the axial direction and opening and closing the opening formed in the wall body by the valve body, for example, there is a discharge mechanism provided in the mixing tank of Patent Document 1 .

  The mixing tank of patent document 1 is for accommodating a granular material, Comprising: It is formed in the bottomed cylindrical shape by which upper direction was open | released. The lower end portion of the peripheral wall portion has a curved vertical cross section and is formed with a circular discharge port. The discharge mechanism supports a substantially disc-shaped discharge valve that opens and closes the discharge port, an air cylinder for driving the discharge valve, an air cylinder, and a discharge path that covers the movement path of the discharge valve and the discharge path of the granular material. And a valve box.

  The discharge valve is connected to the rod of the air cylinder. By extending the rod, the discharge valve is placed inside the discharge port to close the discharge port, and the discharge valve is positioned away from the discharge port. Thus, it is possible to switch between the open state where the discharge port is opened. When the discharge valve is closed, the front surface of the discharge valve (surface opposite to the rod) is arranged flush with the periphery of the discharge port. For this reason, the front surface of the discharge valve has a curved surface in which the upper and lower central portions are recessed in the axial direction from both upper and lower ends, and the axial height of the front edge of the discharge valve is not constant.

  The rod is connected to the approximate center of the discharge valve. Further, since the discharge valve is formed substantially symmetrically with respect to the central axis of the rod, the center of gravity of the discharge valve substantially coincides with the central axis of the discharge valve. Therefore, when viewed from the axial direction, the center of gravity of the discharge valve overlaps the rod.

JP 2001-205069 A

  In the discharge mechanism of Patent Document 1, since the center of gravity of the discharge valve overlaps with the rod when viewed from the axial direction, it is difficult to naturally return to the original state when the rod rotates for some reason and the discharge valve rotates. As described above, since the axial height of the front edge of the discharge valve is not constant, when the discharge valve rotates, the axial height of the front edge of the discharge valve changes. Therefore, when the discharge valve is rotated and disposed at the closed position, a step is generated between the front edge of the discharge valve and the periphery of the discharge port, and as a result, powder particles accumulate on this step. Problems arise. Therefore, it is desirable to be able to suppress the rotation of the discharge valve.

  Further, it is desirable that the rotation of the valve element can be suppressed even when the rod is moved manually in place of the air cylinder pressure.

  Then, an object of this invention is to provide the on-off valve mechanism which can suppress rotation of a valve body.

Means for Solving the Problems and Effects of the Invention

An on-off valve mechanism according to a first aspect of the present invention is a valve body that is disposed inside an opening formed in a wall body to close the opening and is disposed at a position away from the opening to open the opening. The valve body is positioned above the center of gravity of the valve body as viewed from the axial direction and above the center of the surface of the valve body opposite to the shaft member as viewed from the axial direction. And a support member that supports the shaft member so as to be movable in the axial direction, and the valve body closes the opening by moving the shaft member in the axial direction. It is possible to move between a closed position and an open position for opening the opening.

  According to this configuration, since the center of gravity of the valve body is located below the shaft member when viewed from the axial direction, the valve body is difficult to rotate around the shaft member, and even if it rotates, it remains in its original state. You can go back.

  According to this configuration, when viewed from the axial direction, the shaft member is displaced from the center of the surface opposite to the shaft member of the valve body, and the edge of the surface opposite to the shaft member of the valve body from the center axis of the shaft member. Since the length to the portion is not constant, when the valve body rotates around the shaft member, the length from the central axis of the shaft member to the edge of the valve body changes. Therefore, when the valve body rotates in the open position, if the valve body is moved in the direction of the closed position, the valve body comes into contact with the periphery of the opening and is not disposed inside the opening. Therefore, it can prevent reliably arrange | positioning inside an opening part in the state which the valve body rotated. Further, when the valve body comes into contact with the periphery of the opening, the shaft member can no longer move in the axial direction, so that it can be noticed that the valve body is rotating.

The on-off valve mechanism according to a second aspect of the present invention is characterized in that, in the first aspect, the surface of the valve body opposite to the shaft member and the opening are circular when viewed from the axial direction. .

  According to this configuration, since the opening is a circular hole, it is easy to form the opening.

In the first or second invention, the on-off valve mechanism according to a third aspect of the present invention is such that when the valve body is in the closed position, the surface of the valve body opposite to the shaft member is the opening of the wall body. It is characterized by being arranged flush with the surroundings.

  According to this configuration, when the valve body is in the closed position, a step does not occur between the surface of the valve body opposite to the shaft member and the periphery of the opening of the wall body. In this case, it is possible to prevent the powder particles from collecting on the step.

The on-off valve mechanism according to a fourth aspect of the present invention is characterized in that, in the third aspect, the axial height of the edge portion of the surface of the valve body opposite to the shaft member is not constant.

  According to this configuration, since the axial height of the edge of the surface opposite to the shaft member of the valve body is not constant, the axial height of the edge changes when the valve body rotates. If the valve body is disposed inside the opening in a rotated state, a step is generated between the edge of the valve body and the periphery of the opening of the wall body. However, in the present invention, the rotation of the valve body can be suppressed. Therefore, it can suppress that a level | step difference arises.

The open / close valve mechanism according to a fifth invention is characterized in that, in the fourth invention, the surface of the valve body opposite to the shaft member is a curved surface.

  According to this configuration, for example, when the opening is formed in a curved portion of the wall body, the surface of the valve body opposite to the shaft member can be a curved surface along the curved portion of the wall body.

It is a schematic block diagram of the granular material mixing apparatus with which the on-off valve mechanism which concerns on embodiment of this invention was applied. It is a vertical sectional view of the on-off valve mechanism in FIG. It is sectional drawing along the III-III line in FIG. It is the figure which looked at the on-off valve mechanism in FIG. 1 from the cover part side. FIG. 5 is a cross-sectional view taken along line VV in FIG. 1. It is a perspective view of a valve body. It is sectional drawing of the on-off valve mechanism which concerns on other embodiment of this invention.

Embodiments of the present invention will be described below.
Here, an example in which the on-off valve mechanism of the present invention is applied to a powder and particle mixer will be described. The granular material mixer 1 of this embodiment is an apparatus for mixing granular materials such as resin pellets, and as shown in FIG. 1, a bottomed cylindrical tank 2 having an open top, An upper lid 4 detachably attached to the upper end opening of the tank 2, a motor 5, and a support frame 6 that supports the tank 2 and the motor 5 are provided. The granular material is introduced into the tank 2 from the upper end opening of the tank 2. The tank 2 is provided with an on-off valve mechanism 3 for discharging powder particles.

  The tank 2 includes a disk-shaped bottom portion 21 that is horizontally disposed and a cylindrical peripheral wall portion 22 that extends upward from an edge of the bottom portion 21. The lower end portion of the peripheral wall portion 22 has a curved vertical cross section. The inner surface of this curved portion is referred to as a curved surface 23.

  A rotating shaft 7 passes through the bottom portion 21, and a stirring blade 8 attached to the rotating shaft 7 is disposed in the tank 2. The rotating shaft 7 is transmitted with the driving force of the motor 5 via a power transmission mechanism (not shown) housed in the support frame 6. By driving the motor 5 and rotating the stirring blade 8, the powder particles in the tank 2 are stirred.

  A substantially cylindrical discharge port forming portion 24 that protrudes outside the tank 2 is provided at the lower end portion (curved portion) of the peripheral wall portion 22. As shown in FIGS. 2 and 3, the inner peripheral surface of the discharge port forming portion 24 constitutes a discharge port 25 (opening). The discharge port 25 is a circular hole. The central axis of the discharge port 25 is A (see FIG. 2). Further, the diameter of the discharge port 25 increases toward the protruding tip in the vicinity of the protruding tip of the discharge port forming portion 24 and is constant in the other portions. Further, the protruding front end surface of the discharge port forming portion 24 is orthogonal to the axis A.

  2 and 3, the on-off valve mechanism 3 includes a discharge chute 30 attached to the discharge port forming portion 24, a shaft member 40 supported by the discharge chute 30 so as to be movable in the axial direction, and a shaft member. And a valve body 50 that is connected to one end of 40 and opens and closes the discharge port 25. The shaft member 40 is manually operated. By moving the shaft member 40 in the axial direction, the valve body 50 can move between a closed position for closing the discharge port 25 and an open position for opening the discharge port 25.

  As shown in FIG. 2, the discharge chute 30 is detachably attached to the discharge port forming portion 24 by the power clamp 9. The discharge chute 30 includes a substantially cylindrical valve cover part 31 attached to the discharge port forming part 24, a cylindrical chute part 32 connected to the lower part of the valve cover part 31, and a discharge of the valve cover part 31. The outlet forming portion 24 and a lid portion 33 attached to the opposite end portion are provided.

  The valve cover portion 31 covers the movement path of the valve body 50 and extends along the central axis A of the discharge port 25. The lower part of the valve cover 31 is open, and a chute 32 is connected to the opening. The granular material that has flowed into the valve cover portion 31 from the inside of the tank 2 through the discharge port 25 is discharged from the end portion of the chute portion 32 to the outside.

  The lid portion 33 has a configuration in which a disc-like lid body 33a that closes the end opening of the valve cover portion 31, a horizontally long flat plate portion 33b, and a substantially cylindrical boss portion 33c are overlapped and fixed. ing.

  As shown in FIGS. 3 and 4, the left end in FIG. 4 of the plate portion 33 b is connected to the outer peripheral portion of the valve cover portion 31 by a hinge 34. Further, the right end of the plate portion 33b in FIG. 4 is detachably attached to the outer peripheral portion of the valve cover portion 31 by a hook type clamp 35. Thereby, the lid | cover part 33 can be opened as shown with the dashed-two dotted line in FIG.

  As shown in FIGS. 2 and 3, a circular through hole is formed in the lid main body 33 a and the plate portion 33 b, and a sliding bearing 36 is installed inside the through hole. Further, the boss portion 33c is disposed so as to be coaxial with the through holes of the lid main body 33a and the plate portion 33b, and a sliding bearing 37 is provided inside the boss portion 33c.

  A shaft member 40 is inserted into the two slide bearings 36 and 37 so as to be movable in the axial direction. Thus, the shaft member 40 is supported by the discharge chute 30 (lid portion 33) so as to be movable in the axial direction. The central axis C1 of the shaft member 40 supported by the discharge chute 30 is parallel to the central axis A of the discharge port 25 (see FIG. 2).

  As shown in FIGS. 2 and 5, a groove portion 38 extending in the axial direction is formed on the inner peripheral surface of the boss portion 33c opposite to the plate portion 33b. Further, on the outer peripheral surface of the end portion of the shaft member 40 opposite to the valve body 50, a rotation preventing projection 41 that can be fitted into the groove portion 38 is projected. The shaft member 40 can be positioned in the circumferential direction and the rotation of the shaft member 40 can be restricted by fitting the rotation preventing projection 41 into the groove portion 38.

  A screw groove 39 is formed on the outer peripheral surface of the boss portion 33c on the side opposite to the plate portion 33b. Further, an annular rotary member 43 is connected to the end of the shaft member 40 opposite to the valve body 50 by a bolt 42 so as to be relatively rotatable, and a boss portion 33c is connected to the inner peripheral surface of the rotary member 43. A screw groove 44 that can be screwed into the screw groove 39 is formed.

  In a state in which the rotation preventing projection 41 of the shaft member 40 is fitted into the groove portion 38 of the boss portion 33c and the shaft member 40 is unable to rotate, the screw groove 39 of the boss portion 33c and the screw groove 44 of the rotation member 43 are When the rotating member 43 is rotated relative to the shaft member 40 by meshing, the rotating member 43 moves in the axial direction while rotating along the screw groove 39 of the boss portion 33c, and accordingly, the shaft member 40 is rotated. Moves in the axial direction.

  As shown in FIGS. 2, 3, and 6, the valve body 50 includes a substantially cylindrical valve body 51 having a constant outer diameter and a disc part 52 having a larger diameter than the valve body 51 as a central axis. Are connected so that they match. The shaft member 40 is connected to the disc portion 52.

  As shown in FIG. 2, the central axis C2 of the valve body 50 is parallel to the central axis C1 of the shaft member 40 and is located below the central axis C1. The central axis C2 of the valve body 50 coincides with the central axis A of the discharge port 25, and the diameter of the valve body 51 is substantially the same as the diameter of the discharge port 25 on the curved surface 23 side. Accordingly, the surface of the valve main body 51 opposite to the disk portion 52 (hereinafter referred to as the front surface 51a) is circular when viewed from the axial direction of the shaft member 40 and the valve body 50.

  When closing the discharge port 25, the valve body 50 is configured such that the valve body 51 is disposed inside the discharge port 25 and the disc portion 52 is the discharge port forming unit, as shown by the solid line in FIGS. 2 and 3. It abuts on the tip of 24. At this time, the front surface 51 a of the valve main body 51 is disposed flush with the curved surface 23. On the other hand, when opening the discharge port 25, the valve body 50 is arrange | positioned in the position away from the discharge port 25, as shown with the dashed-two dotted line in FIG.

  The front surface 51a is curved with the same curvature as the portion of the curved surface 23 having the same height as the discharge port 25, and has an arcuate curved surface in both the horizontal cross section and the vertical cross section. Further, the front surface 51a is higher in the axial direction toward the lower side. That is, the axial height of the edge portion of the front surface 51a is not constant. Since the axial length of the valve body 50 is longer toward the lower side, the center of gravity G (see FIG. 2) of the valve body 50 is located below the central axis C2 of the valve body 50 when viewed from the axial direction. . Therefore, when viewed from the axial direction, the central axis C <b> 1 of the shaft member 40 is located above the center of gravity G of the valve body 50.

Next, the operation procedure of the on-off valve mechanism 3 will be described.
When closing the discharge port 25, the shaft member 40 is moved obliquely upward along the axial direction from the state indicated by the two-dot chain line in FIG. 2, and the rotation-preventing protrusion 41 of the shaft member 40 is grooved in the boss portion 33 c. 38. Thereby, while being able to position the valve body 50 and the shaft member 40 regarding the circumferential direction, rotation of the shaft member 40 is controlled. Then, the shaft member 40 is further moved obliquely upward, the screw groove 44 of the rotating member 43 is engaged with the screw groove 39 of the boss portion 33c, and the rotating member 43 is gripped and rotated. Thereby, the rotating member 43 moves along the axial direction while rotating along the screw groove 44, and accordingly, the shaft member 40 and the valve body 50 move in the axial direction. As shown in FIG. 2, when the shaft member 40 is moved in the axial direction until the disc portion 52 comes into contact with the tip of the discharge port forming portion 24, the front surface 51 a of the valve main body portion 51 is flush with the curved surface 23. Thus, the discharge port 25 is closed by the valve body 50.

  When opening the discharge port 25, a procedure reverse to the procedure for closing the discharge port 25 is performed. When the lid 33 is opened for cleaning the valve body 50, etc., as shown by a two-dot chain line in FIG. It removes from 33b and rotates the cover part 33 by using the hinge 34 as a fulcrum. Further, when removing the discharge chute 30 from the discharge port forming part 24 for cleaning or the like in the discharge chute 30, the power clamp 9 is removed.

  In the present embodiment, when the valve body 50 is in the open position, the shaft member 40 is rotatable because it is supported only by the slide bearings 36 and 37, but the center of gravity G of the valve body 50 is the axis when viewed from the axial direction. By being positioned below the member 40, the shaft member 40 and the valve body 50 are difficult to rotate. Moreover, even if it rotates, it can return to the original state by the action of the center of gravity G of the valve body 50.

  Since the rotation of the valve body 50 can be suppressed when the valve body 50 is in the open position in this way, when the valve body 50 is moved to the closed position, the detent protrusion 41 of the shaft member 40 is formed in the groove portion 38 of the boss portion 33c. It can be fitted smoothly.

  If the axially extending groove portion is provided in almost the entire axial direction of the shaft member 40, and the rotation preventing protrusion that can be fitted to the groove portion of the shaft member 40 is provided on the inner peripheral surface of the boss portion 33c, Even if the valve body 50 is in the open position, it is possible to restrict the rotation of the shaft member 40 by fitting the anti-rotation protrusion and the groove portion. In this case, since the granular material accumulates in the groove portion of the shaft member. , Cleaning becomes difficult. In this embodiment, since rotation of the valve body 50 can be suppressed without providing a recessed part in the outer peripheral surface of the shaft member 40, the shaft member 40 is easy to clean.

  In the present embodiment, the shaft member 40 is displaced from the center of the front surface 51a of the valve body 50 when viewed from the axial direction, and the length from the center axis C1 of the shaft member 40 to the edge of the front surface 51a of the valve body 50 is long. Since the length is not constant, when the valve body 50 rotates around the shaft member 40, the length from the central axis C1 of the shaft member 40 to the edge of the front surface 51a changes. Therefore, when the valve body 50 rotates in the open position, when the valve body 50 is moved in the direction of the closed position, the valve main body 51 comes into contact with the tip of the discharge port forming portion 24 and is disposed inside the discharge port 25. Not. Therefore, it can prevent reliably that the valve body 50 is arrange | positioned inside the discharge port 25 with the state rotated. Further, when the valve main body 51 comes into contact with the tip of the discharge port forming portion 24, the shaft member 40 can no longer move in the axial direction, so that the operator can notice that the valve body 50 is rotating.

  Moreover, since the axial direction height of the edge part of the front surface 51a of the valve body 50 is not constant, when the valve body 50 rotates, the axial direction height of the edge part of the front surface 51a changes. If the valve body 50 is rotated and disposed inside the discharge port 25, a step is generated between the edge of the front surface 51 a of the valve body 50 and the periphery of the discharge port 25 of the curved surface 23. Then, since it can prevent arrange | positioning inside the discharge port 25 in the state which the valve body 50 rotated, it can prevent that a level | step difference arises. Due to the absence of the step, it is possible to prevent the powder particles from accumulating in the step and the stirring blade 8 from contacting the valve body 50.

  In the present embodiment, the axial movement of the shaft member 40 immediately before the valve body 50 is disposed at the closed position is performed using the screw mechanism of the rotating member 43 and the boss portion 33c. Therefore, since the axial movement of the shaft member 40 becomes slow, it is possible to prevent the disc portion 52 from strongly colliding with the discharge port forming portion 24 and to prevent the valve body 50 from being damaged or deformed.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

In the above embodiment, the periphery of the discharge port 25 on the inner surface of the tank 2 and the front surface 51a of the valve body 50 are both curved in an arc shape in both the horizontal section and the vertical section, but have other shapes. May be.
For example, as shown in FIG. 6, the lower end part of the surrounding wall part 122 may be truncated cone shape, and the discharge port 125 may be formed in this truncated cone part. In this case, the front surface 151a of the valve body 150 is formed in a curved surface having a circular horizontal section and a straight vertical section so that it is flush with the periphery of the discharge port 125 when in the closed position.

  In the above embodiment, the discharge port 25 has a circular shape when viewed from the axial direction of the shaft member 40 in the shape of the opening on the inner surface of the tank 2. Also good. In this case, the front surface 51a of the valve body 50 has a shape other than a circular shape when viewed from the axial direction.

  In the said embodiment, although the valve body 50 is formed in the substantially cylindrical shape with which the shaft member 40 and a central axis are parallel, the shape of the valve body 50 is not limited to this. As long as the valve body 50 has a front surface 51 a that is flush with the inner surface of the tank 2 when disposed inside the discharge port 25, the valve body 50 may not be substantially cylindrical.

  In order to adjust the position of the center of gravity of the valve body 50, the valve body 50 may be provided with a weight. The lower the center of gravity of the valve body 50, the more reliably the rotation of the valve body 50 can be suppressed.

  In the above embodiment, the center of gravity G of the valve body 50 is located below the center of the front surface 51a of the valve body 50 when viewed from the axial direction, but the center of gravity of the valve body 50 is The valve body 50 may be configured to coincide with the center of the front surface 51a or to be positioned above the center. In this modification, the shaft member 40 is coupled to the valve body 50 so as to be positioned above the center of gravity of the valve body 50 when viewed from the axial direction.

  In the above embodiment, the shaft member 40 is located above the center of the front surface 51a of the valve body 50 when viewed from the axial direction. However, the shaft member 40 is located more than the center of gravity of the valve body 50 when viewed from the axial direction. As long as it is located above, it may coincide with the center of the front surface 51a when viewed from the axial direction.

  In the embodiment described above, the axial movement of the shaft member 40 is manually performed, but the axial movement may be performed using an apparatus such as an air cylinder.

  In the said embodiment, although the example which applied the on-off valve mechanism of this invention to the granular material mixer was given and demonstrated, if the on-off valve mechanism of this invention is an apparatus provided with the wall body in which the opening part was formed, Further, the present invention can be applied to other than the powder mixer 1. The wall body may be flat, and in this case, the surface of the valve body opposite to the shaft member is a flat surface.

1 Powder mixing machine 2 Tank (wall)
3 Open / Close Valve Mechanism 21 Bottom 22, 122 Peripheral Wall 23 Curved Surface 24 Discharge Port Forming Portion 25, 125 Discharge Port (Opening)
30 Discharge chute (support member)
33 Lid 33a Lid body 33b Plate 33c Boss 36, 37 Slide bearing 38 Groove 39 Screw groove 40 Shaft member 41 Anti-rotation protrusion 43 Rotating member 44 Screw groove 50, 150 Valve body 51 Valve body 51a, 151a Front surface 52 yen Board

Claims (5)

A valve body that is disposed inside the opening formed in the wall body and closes the opening, and is disposed at a position away from the opening to open the opening;
Connected to the valve body so as to be positioned above the center of gravity of the valve body when viewed from the axial direction and above the center of the surface of the valve body opposite to the shaft member when viewed from the axial direction. A shaft member,
A support member that supports the shaft member so as to be movable in the axial direction;
An on-off valve mechanism characterized in that the valve body is movable between a closed position for closing the opening and an open position for opening the opening by moving the shaft member in the axial direction. Off valve mechanism according to claim 1 in which the surface and the opening on the opposite side to the shaft member of said valve body, characterized in that it is a circular shape when viewed from the axial direction. The surface of the said valve body on the opposite side to the said shaft member when the said valve body is a closed position is arrange | positioned with the circumference | surroundings of the said opening part of the said wall body, The Claim 1 or 2 characterized by the above-mentioned. The on-off valve mechanism described. The on-off valve mechanism according to claim 3 , wherein an edge of a surface of the valve body opposite to the shaft member has a constant height in the axial direction. The on-off valve mechanism according to claim 4 , wherein a surface of the valve body opposite to the shaft member is a curved surface.

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