JP2005180517A - Gate valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gate valve, capable of surely and easily conducting the control for moving a valve rod linearly and the control for expanding and contracting a valve element in the lateral direction in single drive/control system in which serial or continuous operation can be performed. <P>SOLUTION: In this gate valve, a first piston and a cylinder member 45 are provided on the outer peripheral surface of a valve rod 17 in a cylinder case 6, in a fixed section, the piston and the cylinder member 45 are moved in a body with the valve rod 17 linearly, and after that, only the outer cylinder member 45 is moved. The gate valve is provided with a first compressed air supply means and a second compressed air supply means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a gate valve used in a semiconductor manufacturing apparatus or the like.

The gate valve is used, for example, to separate two chambers. In the gate valve shown in FIG. 30, the tip of the valve rod 15 that moves up and down in the valve box 4 is placed against the paper surface. The two valve plates 1 and 1A that expand and move in the left-right direction are connected by a telescopic body 13, and a guide path 14 is provided in the valve rod 15, and compressed air is introduced into the gap 12 through the guide path 14. Thus, the seal member 3 of the valve plate 1 is brought into contact with the valve seat 21 (see Patent Document 1).
JP 2002-181205 A

  By the way, in such a gate valve, although the means for reciprocating the valve plates 1 and 1A in the left and right direction and the means for moving the valve rod 17 up and down are both controlled by compressed air, Introducing and discharging requires separate control mechanisms, and there is a problem that the control becomes complicated.

  In view of such a situation, the present invention provides a single drive / control system capable of performing a series and a continuous operation of a control for linearly moving a valve stem and a control for expanding and contracting a valve body in the left-right direction. It is an object to provide a gate valve that can be reliably and easily performed.

In order to achieve the above object, the gate valve according to the present invention comprises:
A valve box having a gate opening formed between a pair of side surfaces facing each other;
A first port connected to the valve box and serving as a pressure medium supply port when the gap between the gate openings is opened and closed, and a pressure medium supply port when the gap between the gate openings is opened from close The second port is a cylinder case defined at both ends,
It is accommodated movably between the valve box and the cylinder case, and a pressure medium introduction hole is formed through it in the axial direction. Further, two radial holes are formed in the radial direction at a predetermined interval. A valve stem,
A movable part assembly including at least one valve body attached to one end of the valve stem and capable of reciprocating in a direction approaching or separating from the gate opening;
A movable part control mechanism for controlling the amount of protrusion of the valve stem into the valve box and controlling the reciprocating movement of the movable part assembly;
The movable part control mechanism is configured such that the flow of the pressure medium flowing from the first port toward the second port or the first port from the second port with the first port released to the outside. It is controlled by the flow of pressure medium flowing toward the port side of
When the movable part assembly is in the state farthest away from the gate opening and the valve stem is in the state of most movement from the gate opening, the initial position of the movable part assembly,
Due to the flow of the pressure medium supplied to the first port, the valve stem is first moved inward of the valve box, and then the movable part assembly is moved toward the gate opening. The at least one valve body provided in the movable member assembly is brought into contact with the gate opening, thereby closing the gap between the gate openings.
The pressure medium accumulated in the movable part assembly by releasing the first port from a state in which at least one of the gate openings is closed by the valve body of the movable part assembly. Is discharged to the outside through the first port released to the outside from the pressure medium introduction hole of the valve stem, and the movable part assembly is moved from the gate opening. Along with the movement, the gap between the gate openings is opened, and the valve rod is moved to the initial state position by the flow of the pressure medium supplied from that state to the second port side. It is a feature.

  According to the gate valve having such a configuration, the linear movement of the valve stem and the movement of the valve body in the opening / closing direction are controlled by a single drive / control system in a series / continuous operation using a single piping path. can do.

Here, the movable part control mechanism is
A first piston which is slidably mounted on the outer periphery of the valve stem and has two radial holes formed at a predetermined interval;
A stopper member fixedly installed in the cylinder case;
A cylinder member that is slidable with respect to the first piston and that moves to the stopper member alone after the first piston is brought into contact with the stopper member and cannot move;
A locking means configured between the stopper member and the cylinder member for limiting one movement range of the cylinder member;
A valve for opening and closing two radial holes formed in the valve stem;
It is preferable to have.

  With such a configuration, the above-described piping path can be configured in one cylinder chamber.

  Moreover, it is preferable that a pressure medium supply means is connected to each of the first port and the second port.

  Further, it is preferable that a pressure medium lead-in / out cylinder is interposed between the second port and a pressure medium supply means for supplying a pressure medium to the second port.

  Moreover, it is preferable that the pressure medium lead-in / out cylinder is provided with a throttle valve.

  With such a configuration, the operation of the pressure medium lead-in / out cylinder can be delayed in time.

  Further, the movable part assembly includes one valve body and one counter plate, and one gate opening is closed by the one valve body, and the counter plate is connected to the other gate. It is preferable to contact the periphery of the opening.

  With such a configuration, the gate opening can be closed using only one valve element that is necessary at the minimum without preparing two valve elements, which contributes to a reduction in the number of parts. be able to.

  Furthermore, it is preferable that the counter plate is formed smaller than the valve body.

  Thus, reducing the size of the counter plate can contribute to cost reduction.

  Further, it is preferable that a flange portion for mounting a seal member is formed on the first piston.

  Further, it is preferable that a spring receiving portion is formed on the seal member mounting flange portion of the first piston, and a spring is interposed between the spring receiving portion and the cylinder member.

  If the spring is interposed in this way, the first piston can be arranged at the raised position by the biasing force of the spring in a state where the pressure medium is not introduced.

  Further, a rapid discharge valve is connected between the first port and a pressure medium supply means for supplying a pressure medium to the first port, and the pressure medium is supplied from the supply port of the rapid discharge valve. When the pressure medium is introduced in the opposite direction, it is preferable to open the pressure medium to the outside through the discharge port of the quick discharge valve.

  With such a configuration, the back pressure of the pressure medium when the gate valve is opened from the closed state can be quickly discharged.

  Here, the pressure medium is preferably compressed air.

  The pressure medium may be hydraulic.

  If such a pressure medium is employed, handling is easy.

  According to the gate valve of the present invention, the linear movement of the valve stem and the movement of the valve body in the left-right direction can be reliably and easily performed by a single drive / control system capable of continuous / continuous operation. it can. Moreover, the structure is compact.

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

  1 and 2 are a front view and a right side view of a gate valve according to an embodiment of the present invention.

  In this embodiment, for convenience, the state of FIG. 1 is the front face of the gate valve, the upper part of FIG. 1 is “upper” of the gate valve, the lower part of FIG. 1 is “lower” of the gate valve, and FIG. In the state, the left-right direction of the paper surface is described as the left-right direction of the gate valve.

  As shown in FIGS. 1 and 2, the outer casing of the gate valve 2 includes a substantially box-shaped valve box 4, a substantially cylindrical cylinder case 6, and a connecting member that connects the valve box 4 and the cylinder case 6. 8.

  In the pair of side plates of the valve box 4, rectangular gate openings 18 and 20 are formed. In addition, a valve rod 17 that can move linearly between the valve box 4 and the lower cylinder case 6 is accommodated, and a movable part assembly 22 attached to the tip of the valve rod 17 is attached to the valve box 4. When positioned below, the pair of gate openings 18 and 20 are open, and the left and right chambers A and B are in communication.

On the other hand, the movable part assembly 22 is moved upward together with the valve rod 17 and the bellows 19 from the state shown in FIG. The opening 18 is closed, and the counter plate 25 disposed on the other is in contact with the peripheral surface of the other gate opening 20. Thereby, the space between the gate openings 18 and 20 is closed, and the space between the chambers A and B is blocked.

  The operation of the valve rod 17 and the movable part assembly 22 for moving the gate openings 18 and 20 from open to closed or from closed to open is configured in the cylinder case 6 as described later. It is controlled by the operation of the movable part control mechanism C. That is, the operation for opening or closing between the gate openings 18 and 20 or from closing to opening includes an operation in which the valve rod 17 moves linearly and an operation in which the movable part assembly 22 moves in the horizontal direction. These operations are controlled by the movable part control mechanism C.

  The configuration of the movable part control mechanism C configured in the cylinder case 6 will be described below with reference to FIGS. 3 to 6 in particular.

  That is, the movable part control mechanism C is mainly configured on the peripheral surface of the valve rod 17 in the cylinder case 6. The space in the cylinder case 6 is sealed by an upper lid 56 and a lower lid 60, and a first port 63 is defined on the lower side of the cylinder case 6 and a second port 62 is defined on the upper side. .

  As shown in FIGS. 3 and 6, the valve rod 17 that moves linearly in the center of the cylinder case 6 is composed of three members, an upper valve stem portion 68, a lower valve stem portion 69, and a tip valve stem portion 75. A piece 72 is accommodated in a valve chamber 71 defined between the upper valve stem portion 68 and the lower valve stem portion 69, and this piece 72 is moved by the urging force of the spring 64. Usually, it abuts against the inner step 76.

  A cylindrical first piston 30 as shown in FIG. 4 is slidably attached to the valve rod 17 on the outer peripheral surface of the valve rod 17. The valve rod 17 has a pressure medium introduction hole 50 formed in the axial direction. When compressed air is introduced from the lower first port 63 through the pressure medium introduction hole 50, the compressed air then passes through the valve rod 17 and the movable part assembly 22 in the valve box 4. Supplied to the side.

The first piston 30 mounted on the outer peripheral surface of the valve rod 17 is composed of an upper piston 31 formed in a substantially cylindrical shape and a lower piston 32 also formed in a substantially cylindrical shape.
The upper piston 31 and the lower piston 32 may be integrally connected, or may be simply abutted with each other. In the present embodiment, the separately formed ones are simply assembled in a contact state. Two flanges of a first seal member mounting flange portion 33 and a second seal member mounting flange portion 34 are provided on the substantially intermediate outer peripheral surface of the upper piston 31 and the upper end outer peripheral surface of the lower piston 32, respectively. The protrusions are formed, and O-rings 35 and 36 are attached to the flange portions 33 and 34, respectively.

  A recess 37 is formed on the inner peripheral surface of the upper piston 31 on the upper side of the flange portion 33, and a first cylinder chamber 38 is formed between the recess 37 and the outer peripheral surface of the valve rod 17. Yes. A recess 40 is formed on the lower end side of the upper piston 31, that is, on the inner peripheral surface of the contact portion with the lower piston 32, and the second cylinder is formed between the recess 40 and the outer peripheral surface of the valve rod 17. A chamber 41 is configured.

  On the other hand, radial holes 23 and 43 are formed in the upper piston 31 at a predetermined interval. A valve 161 and a second valve 162 are formed between the holes 23 and 43 and the radial holes 160 and 150 of the valve rod 17 (FIGS. 11 and 12).

Further, as shown in FIGS. 3 and 4, the second piston 32 in the lower piston 32 of the first piston 30
The lower surface of the sealing member mounting flange portion 34 functions as a spring receiving portion 44, and one end of the spring 64 is supported here.

  A substantially cup-shaped cylinder member 45 as shown in FIG. 5 is arranged on the outer periphery of the first piston 30 formed in this way.

  The cylinder member 45 includes an upper cylindrical member 51, a lower cylindrical member 52, and a substantially disk-shaped plate body 46, which are assembled by screws 53. The lower end portion of the valve rod 17 is fixed by a nut 48 after being fitted into a through hole 47 formed in the disk-like plate 46 of the cylinder member 45.

  Therefore, such a cylinder member 45 always moves integrally with the valve rod 17 in the vertical direction when the valve rod 17 moves in the vertical direction. In addition, when the compressed air is introduced into the lower first port 63 in the cylinder case 6 shown in FIG. 3, the cylinder member 45 is compressed into the pressure medium introduction hole 50 of the valve rod 17. Led.

  Further, passages 141 and 142 are formed in the radial direction in the upper cylindrical member 51 and the lower cylindrical member 52 of the cylinder member 45 so as to be spaced apart from each other by a predetermined distance. Further, a recess 143 is formed on the outer peripheral surfaces of the upper cylindrical member 51 and the lower cylindrical member 52 in order to allow the passages 141 and 142 to communicate with each other. Due to the recess 143 and the passages 141 and 142, a compressed air introduction passage is formed in the vertical direction between the outer peripheral surface of the cylinder member 45 and the inner peripheral surface of the cylinder case 6 that is in close contact therewith. . That is, in the gate valve 2 of the present embodiment, there are two types of passages: an internal passage that passes through the inside of the valve rod 17 and an external passage that passes through the outside of the cylinder member 45.

  Further, on the upper end side of the upper cylindrical member 51 of the cylinder member 45 shown in FIG. 5, a locking member 55 having a cylindrical shape and having a locking protrusion 55 a formed at the tip is integrally attached by a screw 54. It has been. As shown in FIG. 3, the locking member 55 is detachably locked to a stopper member 57 attached to the upper lid 56 of the cylinder case 6. That is, as will be described later, when the cylinder member 45 is moved away from the first piston 30 that has moved integrally and moved upward alone with the first piston 30 left, the cylinder member 45 is locked. The protrusion 55a is locked to the side wall surface of the stopper member 57 attached to the upper lid 56, and the lock means 58 is formed here.

  Further, as shown in FIG. 5, positioning step portions 65 and 66 are formed on the inner peripheral surface of the cylinder member 45. When the first piston 30 is assembled in the cylinder member 45, the two flange portions 34 and 33 of the first piston 30 are brought into contact with the positioning step portions 65 and 66, respectively. When the flange portions 34 and 33 of the first piston 30 are brought into contact with the positioning step portions 65 and 66, the upward movement of the first piston 30 in the cylinder member 45 is restricted.

  Next, the structure of the valve rod 17 will be described with reference to FIGS. 3 and 6.

As described above, the valve stem 17 is formed by connecting the upper valve stem portion 68, the lower valve stem portion 69, and the tip valve stem portion 75, which are formed to have substantially the same diameter. A valve chamber 71 is defined between the butted ends of the valve stem portion 69. A spring 64 is accommodated in the valve chamber 71, and the substantially convex piece 72 is pressed upward by the urging force of the compression spring 64. The piece 72 is formed so that the axial hole 73 and the radial hole 74 communicate with each other, and a seal member 77 is interposed at the tip of the piece 72. When such a piece 72 is accommodated in the valve chamber 71 and pressed upward by the urging force of the spring 64, the normally closed portion between the inner step portion 76 of the upper valve stem portion 68 and the piece 72 is closed. The valve V is configured.

  Accordingly, since the valve V is normally closed, the hole portion 50 a formed in the lower valve rod portion 69 of the valve rod 17 does not communicate with the hole portion 50 b formed in the upper valve rod portion 68. When a predetermined pressure is applied downward from the hole portion 50b of the upper valve rod portion 68 of the valve rod 17, the valve V is opened and the hole portions 50b and 50a are communicated with each other.

  Returning to FIG. 3, a quick discharge valve 78 is connected to the side wall portion of the lower lid 60 attached to the lower end of the cylinder case 6, and a supply port serving as a compressed air introduction hole is connected to the quick discharge valve 78. 79 and a discharge port 80 for discharging back pressure. A first compressed air supply means (not shown) is connected to the supply port 79 side. The supply port 79 and the discharge port 80 are each provided with a valve so that compressed air does not flow except in a predetermined direction. When compressed air is introduced into the quick discharge valve 78 from the first compressed air supply means via the supply port 79, the discharge port 80 is closed.

  Further, as will be described later, a second compressed air supply means is also provided on the upper lid 56 side of the cylinder case 6. A nipple 82 is connected to the side wall of the upper lid 56, and a compressed air lead-in / out cylinder 83 is further connected. The second compressed air supply means (not shown) is connected to the outlet 85 of the joint member 84 connected to the lower end side of the compressed air outlet / inlet cylinder 83. The outlet 85 of the joint member 84 is provided with a valve, and compressed air is introduced and discharged through the outlet 85. A throttle valve 87 is provided on the bottom wall of the compressed air lead-in / out cylinder 83.

  Hereinafter, the configuration of the compressed air lead-in / out cylinder 83 will be described with reference to FIGS. 3 and 7.

  The compressed air lead-in / out cylinder 83 has a bottomed cylindrical cylinder member 165 and an upper lid 88 that covers an upper opening of the cylinder member 165, and the nipple 82 is screwed to the upper lid 88. Further, a passage 89 is formed in the vertical direction on the side wall portion of the cylinder member 165 of the compressed air lead-in / out cylinder 83, and further, a radial passage 170 is formed in communication with the vertical passage 89. The throttle valve 87 is screwed to the lower end opening of the passage 89 in the vertical direction. The throttle valve 87 is connected via a piping member 91 to a passage 90 to which a joint member 84 is screwed.

  Further, a cylindrical piston 93 is slidably accommodated in the internal space 92 of the cylinder member 165 of the compressed air lead-in / out cylinder 83. A spring 94 is interposed on the lower end side of the piston 93. Further, between the upper lid 88 and the cylinder member 165 in the piston 93, a substantially cylindrical guide member 97 composed of a first rod-shaped portion 95 and a second rod-shaped portion 96 is installed so as not to move. A first chamber 98 is formed between the lower surface of the second rod-shaped portion 96 and the bottom surface of the cylinder member 165. Similarly, a second chamber 98 is formed between the first rod-shaped portion 95 and the upper lid 88. The room 99 is defined.

  In addition, a valve chamber 102 is formed inside the lower side of the first rod-shaped portion 95, and a piece 107 having an axial hole 104 and a radial hole 105 formed in the valve chamber 102 is a compression spring 112. It is housed so that it can move linearly. A normally closed valve W is configured between the piece 107 and the axial hole 101 formed in the first rod-like portion 95.

  Therefore, in the compressed air lead-in / out cylinder 83, the space between the second chamber 99 and the first chamber 98 arranged vertically is normally closed by the valve W.

Further, radial holes 108 and 109 are formed in the first rod-shaped portion 95 and the second rod-shaped portion 96, respectively. A cylinder chamber 110 is defined between the outer peripheral surface of the first rod-shaped portion 95 and the inner peripheral surface of the piston 93. In the state of FIG. 7, the cylinder chamber 110 does not communicate with the through hole 100 of the second rod-like portion 96, but the piston 93 moves downward while compressing the spring 94 from the state of FIG. When the taper surface 111a formed on the flange portion 111 of the 93 moves beyond the radial hole 109 of the second rod-shaped portion 96, the cylinder chamber 110 and the radial hole 109 of the second rod-shaped portion 96 communicate with each other. To do. Thereby, the through hole 100 of the second rod-shaped portion 96 is passed through the radial hole 109, the cylinder chamber 110, the radial hole 108 of the first rod-shaped portion 95, and the axial hole 101 of the first rod-shaped portion 95. It communicates with the second chamber 99 and then communicates with the cylinder case 6 of the gate valve 2 shown in FIG. 1 through the nipple 82, through which compressed air is introduced to the cylinder case 6 side. .

  In FIG. 7, the throttle valve 87 can throttle the amount of compressed air supplied from the outlet 85 side of the joint member 84 via the piping member 91. Thereby, it is possible to delay the time from when compressed air is supplied from the outlet 85 of the joint member 84 until the piston 93 in the compressed air outlet / inlet cylinder 83 operates.

  Next, the structure of the movable part assembly 22 attached to the tip of the valve rod 17 so as to be openable and closable will be described with reference to FIGS. 1, 2 and 8.

  A movable part assembly 22 that can be expanded and contracted in the left-right direction is attached to the tip of the valve stem 17. As shown in FIG. 1, a substantially rectangular valve body 24 that is long in the width direction is attached to one end portion on the left side of the movable portion assembly 22, and the other end portion is formed with a smaller diameter. A rectangular counter plate 25 is attached.

  As shown in FIG. 2, the dimension T of the counter plate 25 is formed larger than the dimension U of the vertical opening of the gate opening 20. Thereby, the counter plate 25 has a structure straddling the opening 20 when it abuts on the gate opening 20. The valve body 24 is provided with a seal member 163.

  Furthermore, the movable part assembly 22 has a valve cylinder 120, and further has a pair of pistons 118 and 119 that can move in the left-right direction in the valve cylinder 120. The pair of pistons 118 and 119 are movably attached to the side plates 122 and 123 via a pair of elastic members 121. Further, a seal member 124 is attached to the end side surfaces of the pistons 118 and 119, and sliding is guided by the seal member 124 while maintaining airtightness.

  On the other hand, a pressure chamber 125 is defined in the gap between the pair of pistons 118 and 119, and when compressed air is introduced into the pressure chamber 125, the pair of pistons 118 and 119 are separated from each other, that is, 2 and 8 are configured to move in the left-right direction.

Further, shafts 126 and 127 are connected to the pair of pistons 118 and 119 by screws, respectively, and side plates 128 and 129 are similarly attached to the other ends of the shafts 126 and 127 by screws. Bellows 130 and 131 are mounted between the pair of side plates 122 and 123 of the valve cylinder 120 and the side plates 128 and 129, respectively. In addition, bearings 132 and 133 are interposed on the outer circumferences of the shafts 126 and 127. Thereby, when compressed air is introduced from the lower valve rod 17 into the pressure chamber 125 in the valve cylinder 120, the pair of pistons 118 and 119 are moved away from each other, and accordingly, the shaft 126 and the side plate 128 are integrally moved to the left, and the shaft 127 and the side plate 129 are integrally moved to the right.
As shown in FIG. 2, the valve body 24 attached to one side plate 128 abuts on the gate opening 18, and the counter plate 25 attached to the side plate 129 is around the other gate opening 20. Contact the surface.

  On the contrary, when the compressed air in the pressure chamber 125 of the valve cylinder 120 is discharged through the valve rod 17, the pair of pistons 118 and 119 are restored to the original state by the restoring force of the elastic member 121. The valve body 24 moves away from the gate opening 18, and the counter plate 25 moves away from the other gate opening 20. As a result, the gate valve is opened.

  The gate valve 2 according to the present embodiment is configured as described above, and the operation thereof will be described below.

  Now, it is assumed that the movable part assembly 22 is in the lower position in the valve box 4 as shown in FIGS. 1 and 2. That is, the valve body 24 is located below the gate opening 18 while being close to the counter plate 25, and is separated from the gate opening 18. As a result, the gate openings 18 and 20 are in communication.

  The operation of the gate valve 2 from the open state to the closed state will be described with reference to FIGS. 3 and 9 to 12.

  First, compressed air is introduced into the first port 63 of the cylinder case 6 from the first compressed air supply means connected to the supply port 79 of the quick exhaust valve 78 as indicated by an arrow E. Then, the compressed air is introduced from the first port 63 into the pressure medium introduction hole 50 in the valve rod 17. At this time, in the valve stem 17, the radial hole 150 in the valve stem 17 is closed. That is, the second valve 162 is closed. Further, the valve V positioned above this is also closed. Therefore, the compressed air supplied from the first compressed air supply means into the first port 63 cannot escape anywhere through the inside of the valve rod 17. Thereby, the compressed air introduced into the first port 63 is accumulated in the first port 63, thereby pressing the disk-shaped plate body 46 of the cylinder member 45 upward from below. . Accordingly, the cylinder member 45, the first piston 30, and the valve rod 17 are integrally moved upward, and the state shown in FIG. 10 is obtained. As shown in FIG. 10, when the cylinder member 45 and the first piston 30 are integrally moved in the cylinder case 6, first, the distal end portion 31 a of the first piston 30 is attached to the upper lid 56. It comes into contact with the stopper member 57. As a result, the upward movement of the first piston 30 is stopped and remains at this position.

  At this time, the back pressure existing in the second port 62, that is, between the cylinder member 45 and the upper lid 56, is led out toward the compressed air lead-in / out cylinder 83 through the nipple 82.

  As shown in FIG. 10, the back pressure discharged to the compressed air lead-in / out cylinder 83 side, that is, compressed air, is first accommodated in the second chamber 99, and the axial hole 101 passes through the second chamber 99. Further, the piece 107 is pressed downward. Thereby, the valve W of the piece 107 is opened. Then, the compressed air in the second chamber 99 passes through the valve W and is supplied into the first chamber 98 below. Then, it passes through the passage 90 and is quickly discharged from the outlet 85 of the joint member 84. In this way, the back pressure is discharged when the gate valve 2 is closed.

  On the other hand, as shown in FIG. 10, in the state where the tip portion 31 a of the upper piston 31 is in contact with the stopper member 57, the tip portion of the valve rod 17 in the valve box 4 moves upward.

In this state, since the compressed air continues to be introduced to the first port 63 side, only the outer cylinder member 45 is in relation to the upper piston 31 of the first piston 30 that has already become immovable. Moves further upward, and the state shown in FIG. 11 is obtained. In the state of FIG. 11, the tip of the valve stem 17 is substantially at the same height as the gate openings 18 and 20.

  As shown in FIG. 11, when the outer cylinder member 45 moves upward, the locking projection 55a of the locking member 55 is locked to the side wall portion of the stopper member 57, and the locking means 58 is formed here. . Thereby, the cylinder member 45 is also moved upward in the same manner as the first piston 30. At this time, the radial hole 150 in the valve rod 17 and the radial hole 43 of the first piston 30 are communicated with each other. That is, the second valve 162 is opened. When the second valve 162 is thus opened, the compressed air introduced into the valve rod 17 from the first port 63 side is guided to the outside as indicated by the arrows in FIG. , Through the passage 142 on the lower side of the cylinder member 45, to rise through the recess 143 on the cylinder member 45, further on the passage 141 on the upper side of the cylinder member 45, and further above the flange portion 33 of the first piston 30. Passes through the radial hole 23 formed in the first cylinder chamber 38 and reaches the first cylinder chamber 38.

  Thereafter, as indicated by an arrow F in FIG. 12, the first piston 30 is pressed downward. When the first piston 30 is pressed downward, the radial hole 23 formed in the first piston 30 communicates with the radial hole 160 formed in the valve rod 17. As a result, the first valve 161 is opened.

  Accordingly, the compressed air that has passed through the first valve 161 is guided upward through the pressure medium introduction hole portion 50 b of the valve rod 17, and inside the valve cylinder 120 of the movable part assembly 22 accommodated in the valve box 4. To be supplied.

  Thus, the compressed air is accommodated in the pressure chamber 125 by introducing the compressed air into the valve cylinder 120. In the valve box 4 at this time, the valve rod 17 has already moved upward when the state shown in FIGS. 9 to 11 is reached. In other words, the upward movement operation of the valve stem 17 has been completed.

  When the compressed air is introduced into the pressure chamber 125 of the valve cylinder 120 while the valve rod 17 is at a high position in the valve box 4, the pair of pistons 118 and 119 are moved in the left-right direction in FIGS. Move to.

  Thus, when the pair of pistons 118, 119 move in the left-right direction in FIGS. 2 and 8, one valve element 24 moves to the left, thereby contacting the gate opening 18 and closing the gate opening 18. Is done. On the other hand, the counter plate 25 moves to the right and comes into contact with the peripheral portion of the gate opening 20. Since compressed air is further introduced into the pressure chamber 125 from this state, communication with the chamber A chamber B is blocked.

  In this way, the operation from opening to closing of the gate valve is completed.

  Next, the operation of the gate valve from closing to opening will be described with reference to FIGS. The operation from closing to opening of the gate valve is substantially the reverse operation from opening to closing, compressed air is introduced from the compressed air lead-in / out cylinder 83 side, and back pressure is discharged from the first port 63 side. First, when the gate valve 2 is in a closed state, the position of the movable part assembly 22 is at the position shown in FIG. FIG. 13 is in the same position as FIG.

That is, as shown in FIG. 13, the lock means 58 functions on the upper side of the cylinder member 45, and the cylinder member 45 is in a state where it cannot move. The valve rod 17 is in the raised position. From the state of FIG. 13, first, the discharge port 80 of the quick discharge valve 78 is released to the outside. Thereby, the compressed air in the pressure chamber 125 of the valve cylinder 120 presses the piece 107 downward. Then, the valve V is opened, the compressed air flows through the valve V and the inside of the piece 107 to the first port 63, and is further discharged to the outside from the discharge port 80 of the quick discharge valve 78.

  In this way, the compressed air in the valve cylinder 120 is discharged from the quick discharge valve 78 through the valve rod 17. On the other hand, even if compressed air is introduced from the outlet 85 on the compressed air outlet / inlet cylinder 83 side from such a state, the second port 62 is not opened anywhere in the state of FIG. The compressed air flowing in the direction of arrow G from the valve cylinder 120 side passes through the outer recess 143, and the compressed air that passes through the passage 142 passes through the holes 43 and 150, passes through the first valve 161, and is 1 to port 63. Accordingly, in FIG. 13, when the pressure in the chamber 166 becomes smaller than the urging force of the spring 64, the lower piston 32 moves upward, and the state shown in FIG. 14 is obtained. As a result, the first piston 30 composed of the lower piston 32 and the upper piston 31 moves upward, and the distal end portion 31 a of the upper piston 31 comes into contact with the end surface of the stopper member 57. Thereby, the upward movement of the first piston 30 is stopped, and both the first piston 30 and the cylinder member 45 are stopped at the upper position. In the valve box 4 at this time, the valve body 24 is completely separated from the gate opening 18, but the valve rod 17 is still in the upper position.

  The operation when the second compressed air supply means is operated to move the valve rod 17 downward from the state of FIG. 14 will be described. Compressed air from the second compressed air supply means is supplied from the outlet 85 of the joint member 84.

  In FIG. 13, the compressed air that has flowed from the first chamber 98 into the through hole 100 has no escape and remains at that position. On the other hand, the compressed air that has passed through the throttle valve 87 flows into the radial passage 167 via the vertical passage 89 and is further introduced into the valve chamber 102. The pressure in the valve chamber 102 indicates the arrow H. In this manner, the piston 93 is pressed downward. As a result, the piston 94 moves downward while the spring 94 is compressed, and the state shown in FIG. 14 is obtained. As a result, the hole 109 of the second rod-shaped portion 96 communicates with the cylinder chamber 110, flows as indicated by the arrows I, J, and K, and flows from the nipple 82 into the cylinder case 6.

  Then, the compressed air flowing through the nipple 82 is introduced into the second port 62 as shown in FIG. Then, the compressed air introduced into the second port 62 presses the cylinder member 45 downward and releases the locking means 58. Thereafter, the cylinder member 45, the first piston 30, and the valve rod 17 are integrally moved together to be in the state shown in FIG. As a result, the valve stem 17 moves to the lower position and returns to the position shown in FIG. Then, the back pressure in the first port 63 is discharged to the outside from the discharge port 80 of the quick discharge valve 78.

  In this way, the gate valve 2 is operated from opening to closing or from closing to opening.

As described above, according to the present invention, in order to open and close the gate valve, the linear movement of the valve rod 17 and the control for moving the valve body 24 in the left-right direction are combined into one piping path. And can be controlled in a series of operations. That is, in the gate valve of the present invention, a series / continuous operation can be performed by a single drive / control system. Therefore, control is easy. In addition, the control is not a structure in which the valve body 24 is directly operated or the movable part assembly 22 is directly operated, both in the case of opening from the closed state and in the case of opening from the closed state. Can be performed. This increases the reliability of the gate valve. In particular, when the valve rod 17 is pushed downward, the operation of the piston 93 in the compressed air lead-in / out cylinder can be delayed in time because the compressed air lead-in / out cylinder 83 includes the throttle valve 87. That is, the introduction of compressed air from the compressed air supply means into the cylinder case 6 can be delayed in time.

  As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example at all. For example, in the above embodiment, the quick discharge valve 78 is provided on the cylinder case 6 side. However, the quick discharge valve 78 may be replaced by an electromagnetic valve. Further, two valve bodies 24 may be provided without providing the counter plate 25. Moreover, in the said Example, although compressed air is employ | adopted as a pressure medium, it replaces with this and can also employ | adopt hydraulics as a pressure medium.

  In addition, when employ | adopting oil_pressure | hydraulic as a pressure medium, of course, appropriate changes, such as a sealing material, are performed compared with the case where compressed air is used. For example, when the back pressure is released to the outside from the quick discharge valve, it is preferable to return it to an oil reservoir such as an oil unit.

  Furthermore, although the shape of the gate openings 18 and 20 in the above embodiment is rectangular, it can also be applied to a round gate valve.

  In the above-described embodiment, the gate valve is described which is effective particularly when the vertical installation space is sufficient. However, when the vertical installation space is limited, the cylinder case 6 is replaced with the valve box 4. It can also be provided substantially in parallel.

  FIGS. 17 to 21 show a gate valve effective for installation in a narrow place in the vertical direction. In this embodiment, a part of members having the same effects as the above embodiment will be described with the same reference numerals. In addition, the gate valve shown in FIGS. 17 to 21 can be installed in any direction, up, down, left, and right. In the following explanation, upper, lower, left, and right are used for the convenience of explanation. is there. In other words, the gate valve can be installed in an upside-down position or a 90-degree tilted position.

  FIG. 17 shows the entire gate valve. FIG. 18 is a side sectional view of the valve box portion shown in FIG. 17, and FIG. 19 is a movable part assembly constructed in the valve box 4 shown in FIG. FIG. 20 is an enlarged sectional view of the cylinder case 6 shown in FIG. 17, and FIG. 21 is a partially enlarged sectional view of FIG. In addition, in FIG. 17, it is the figure which looked at the inside of the valve box 4 of FIG.

  As shown in FIG. 17, in this gate valve 200, the cylinder case 6 is not arranged up and down with respect to the valve box 4 as in the above embodiment, but is arranged side by side with the valve box 4. The length is shortened and the whole is made compact. The valve body 24 for opening and closing the gate opening 18 is formed in a round shape. Further, in the cylinder case 6 and the valve box 4, valve rod portions 17A and 17B for linearly moving the valve body 24 are accommodated, respectively. A pressure medium introduction hole 50 is formed through these valve stem portions 17A and 17B. Moreover, these valve stem parts 17A and 17B are connected via the piping member 211 in the cover member 219, and are moved up and down integrally. Further, the valve box 4 and the cylinder case 6 are connected by a plate-like connecting member 260.

  In other words, in the present embodiment, the valve stem portions 17A and 17B move simultaneously from the state of FIG. 17 toward the cover member 219, whereby the valve body 24 moves downward. On the contrary, when the valve stem portions 17A and 17B move upward from the lower position of the cover member 219, the valve body 24 approaches the height position of the gate openings 18 and 20. Note that flanges 201 and 201 are attached to the outside of the valve box 4, respectively.

On the other hand, a compressed air lead-in / out cylinder 83 similar to that shown in FIG. 3 is connected to the upper end portion of the cylinder case 6 arranged side by side on the valve box 4.

  Further, the movable part control mechanism C for controlling the opening / closing operation of the valve body 24 with respect to the gate opening 18, that is, the movement of the valve body 24 and the counter plate 25 in the left-right direction in FIG. 6 between the two. According to this movable part control mechanism C, as shown in an enlarged view in FIG. 19, it is defined between the pair of pistons 118 and 119 from the air introduction port 203 in the valve cylinder 120 accommodated in the valve box 4. When the compressed air is introduced into the pressure chamber 125, the pair of pistons 118 and 119 are expanded and moved in the left-right direction. When the pair of pistons 118 and 119 expand and move, the springs 205 and 206 are compressed, and the pistons 118 and 119 move away from each other, that is, in the left-right direction. Along with this, the shaft 126 attached to the substantially central portion of the pistons 118 and 119 moves to the left, the shaft 127 moves to the right, and the valve body 24 contacts the gate opening 18. Further, the counter plate 25 abuts on the peripheral surface of the other gate opening 20. As a result, the round gate valve is closed. A bellows 207 is mounted between the pistons 118 and 119, the valve body 24, and the counter plate 25 in this embodiment.

  As shown in FIG. 17, the valve stem 17 according to the present embodiment is roughly composed of a valve stem portion 17 </ b> A in the valve box 4 and a valve stem portion 17 </ b> B in the cylinder case 6. As shown in FIG. 20, the valve stem portion 17B of the first valve stem component 208 is a long and main valve stem component 208, a second valve stem component 209 having a flange portion 209a, and a tip. The valve stem 17 is composed of four members as a whole.

  In the valve stem portion 17B, after the plate body 46 of the bottomed cylindrical cylinder member 240 is fitted to the tip of the first valve stem component 208, the second valve stem component 209 is moved to the first valve stem component 208. The cylinder member 240 is integrated with the valve stem portion 17B by being screwed into the internal thread of the valve stem component 208. The cylinder member 240 always moves integrally with the valve stem portion 17B.

  The cylinder member 240 of this embodiment includes a substantially cup-shaped first cylinder member 261 having a plate body 46, and a second cylinder screwed to the front end side of the first cylinder member 261 by a screw 222. A locking member 55 that constitutes the locking means 58 is attached to the tip of the second cylinder member 223.

  On the other hand, a cylindrical first piston 224 is interposed on the outer periphery of the second valve stem component 209 and the third valve stem component 210. The first piston 224 moves slidably with respect to the valve stem components 209 and 210. A spring 225 is interposed between the flange portion 224 a of the first piston 224 and the plate body 46 of the cylinder member 240.

  Further, the first piston 224 is formed with radial holes 226 and 227 spaced apart from each other by a predetermined interval.

  On the other hand, the piece 230 is accommodated in the valve chamber 71 defined in the connecting portion between the second valve stem component 209 and the third valve stem component 210, and the head 230a of the piece 230 is The hole 230b is formed in the third valve stem component 210, and the hole 230b guides the sliding of the piece 230 in the axial direction.

  Further, the piece 230 is in contact with the distal end portion of the second valve stem component 209 in the state shown in FIG. 21 by the urging force of the compression spring 231. Thereby, the valve N is normally closed by the seal member 232 mounted on the piece 230.

  Seal members 233 and 234 are attached to the outer periphery of the second valve stem component 209 and the third valve stem component 210. Further, a stopper member 57 having a partially bulged outer periphery is installed on the wall surface of the upper cover 56 of the cylinder case 6, and a locking member 55 formed in a cylindrical shape is provided at the lower end of the stopper member 57. A bulging portion 57a for locking the locking projection 55a is formed. The upper and lower inner peripheral surfaces of the locking protrusion 55a of the locking member 55 are formed with a taper T. Similarly, the upper and lower outer surfaces of the bulging portion 57a of the stopper member 57 are also formed with a taper T.

  A second port 62 is configured between the lower surface of the upper lid 56 and the cylinder member 240, and a first port 63 is configured between the lower surface of the cylinder member 240 and the lower lid 60. That is, in this embodiment, the gate valve is opened from the closed state by introducing the compressed air into the second port 62 from the state of FIG. 17 as will be described later. In addition, the compressed air is introduced into the first port 63 from the state where the gate valve is opened, so that the gate valve is opened and closed.

  Further, in this embodiment, when the pressure in the second port 62 becomes higher than the locking force of the locking means 58, the rising means first releases the locking means 58 and then pushes the cylinder member 240 downward. It is done. In this case, the valve stem portion 17B is also pushed down. When the valve stem portion 17B is pushed down, together with this, the valve stem portion 17A is pushed down in the valve box 4.

  On the other hand, a quick discharge valve 78 is connected to the lower lid 60 of the cylinder case 6 of the present embodiment. The structure of the quick discharge valve 78 is the same as that of the above embodiment.

  The gate valve 200 according to the present embodiment is configured as described above. The operation will be described below, and the configuration will be described in more detail. That is, also in the case of this gate valve 200, the control for linearly moving the valve stem portions 17A and 17B and the control for expanding and contracting the valve body 24 in the left-right direction are the same as in the above embodiment. It is characterized by a single drive / control system capable of continuous / continuous operation.

  FIGS. 22 to 25 show operations in order from the valve closed state to the valve open state of the gate valve 200.

Now, the valve body 24 is in the upper position in the valve box 4 as shown in FIG. That is, as shown in FIGS. 18 and 19, the gate opening 18 is closed. At this time, in the cylinder case 6, as shown in FIG. 22, the movable part assembly 120 is in the upper position. In this state, compressed air is continuously introduced into the first port 63 as indicated by the arrow P through the quick discharge valve 78 connected to the lower lid 60 of the cylinder case 6. Thus, the valve closed state is maintained. In the first port 63, the compressed air is introduced, so that the cylinder member 240 is pressed upward as indicated by the arrow Q, but has already reached the upper limit position. Never move. On the other hand, the compressed air introduced into the first port 63 passes through the axial hole 241 formed in the first cylinder member 261 and the radial hole 242 formed in the first cylinder member 261, and then the cylinder member The outer peripheral passage 243 between the cylinder 240 and the cylinder case 6 is further raised, and passes through the radial hole 244 formed in the second cylinder member 223 and the radial hole 226 formed in the first piston 224. It is introduced on the inner peripheral side of one piston 224. A part of the compressed air thus introduced to the inner peripheral side of the first piston 224 passes through the radial hole 228 of the third valve stem component 210 and presses the piece 230 downward. Since the valve N configured in the above is closed, there is no flow from the valve N. On the other hand, most of the compressed air introduced to the inner peripheral side of the first piston 224 flows in the order of arrow R and arrow S through the outer periphery of the third valve stem component 210, and the valve box 4 The valve cylinder 120 is led out. Since the pistons 118 and 119 are expanded in the left-right direction in FIG. 18 by the compressed air led to the valve cylinder 120, the gate opening 18 is closed.

  In order to open the gate valve 200 with the state of FIG. 22 as an initial state, first, as shown in FIG. 23, the discharge port 80 of the quick discharge valve 78 connected to the lower lid 60 is opened. To be released. As a result, the back pressure in the first port 63 is discharged as indicated by the arrow W. Then, since the pressure in the first port 63 is reduced, the compression stays in the axial hole 241 of the cylinder member 240, the radial hole 242 of the cylinder member 240, the outer peripheral passage 243, the radial hole 244, and the like. Air is exhausted. Then, since the pressure of the compressed air that has been pressing the piece 230 downward is lost, the valve N is opened. When the valve N is opened, the compressed air in the valve stem portion 17A to which the valve cylinder 120 is connected flows toward the valve N side as indicated by the arrow X, and further the third valve element component 210 Through the radial hole 228, the radial hole 226 of the first piston 224, further through the radial hole 244 of the second cylinder member 223, and further through the outer peripheral passage 243, the radial hole 242 and the axial hole 241, It is introduced into the first port 63 and led out to the outside from the first port 63 as indicated by an arrow W.

  Next, the state shown in FIG. 24 is followed. In FIG. 24, as indicated by the arrow Y, the compressed air is introduced into the second port 62 from the pressure derivation cylinder 83 side. That is, compressed air is supplied into the second port 62 through the outlet 85 of the joint member 84 connected to the compressed air outlet / inlet cylinder 83 shown in FIG. At this time, since the compressed air lead-in / out cylinder 83 is provided with the throttle valve 87 as in the above-described embodiment, the compressed air is supplied from the lead-out inlet 85 of the joint member 84 and then into the cylinder case 6. There is a time delay before the compressed air is actually introduced. Thus, when the compressed air is introduced into the cylinder case 6 with a time delay as indicated by the arrow Y, the compressed air is led to the side through the passage formed in the stopper member 57, and Then, when the compressed air in the second port 62 becomes higher than a predetermined pressure, the state shown in FIG. 25 is reached after the state shown in FIG. 24, and the lock means 58 is released. As a result, the cylinder member 240 receives a force in the direction of the arrow Z and moves downward in a lump. At this time, the valve stem portion 17B also moves integrally. The compressed air in the second port 62 passes through the axial hole 252 formed in the second cylinder member 223, passes through the axial hole 252 of the first cylinder member 261, and further passes through the first cylinder member 261. Through the radial hole 253 and introduced into the cylinder chamber 254.

  The compressed air introduced into the cylinder chamber 254 presses the first piston 224 upward as indicated by the arrow D. Thereby, the first piston 224 moves slightly upward from the state of FIG. 23 to the state of FIG. In FIG. 23, even if the first piston 224 is moved slightly upward, the cylinder member 240 includes the first piston 224 and is integrated with the valve stem member 17B. It moves below the case 6. Thus, in the state of FIG. 25, the valve stem portion 17 </ b> A moves downward in the valve box 4, and the valve stem 17 </ b> A is at a position farthest from the gate opening 18. That is, in the state of FIG. 25, the valve stem portions 17A and 17B are moved downward in the entire stroke.

  The operation from the closing to the opening of the gate valve 200 has been described above. Hereinafter, the operation from the opened state to the closed state of the gate valve will be described with reference to FIGS. .

  Now, the valve body 24 is in the lower position in the valve box 4. As a result, the gate opening 18 is open. Further, the pair of pistons 118 and 119 of the valve cylinder 120 are in positions closest to each other. At this time, the valve stem portion 17B in the cylinder-case 6 is positioned at the lowest position as shown in FIG. Further, the plate body 46 of the cylinder member 240 is in contact with the lower lid 60 of the cylinder case 6.

  In the state of FIG. 26, that is, the initial state of valve opening, compressed air is introduced into the second port 62 as indicated by the arrow Y. Thereby, the cylinder member 240 receives the force in the arrow Z direction. The valve N is closed.

  The state shown in FIG. 26 is changed to the state shown in FIG. That is, the back pressure in the second port 62 is discharged in the arrow YY direction through the nipple 82, the compressed air lead-in / out cylinder 83, and the joint member 84 shown in FIG. Then, compressed air is introduced into the first port 63 through the quick discharge valve 78 connected to the lower lid 60 as indicated by an arrow P. The cylinder member 240 is first pressed in the arrow Q direction by the introduction of the compressed air in the arrow P direction. Compressed air passing from the axial hole 241 of the cylinder member 240 through the radial hole 242, further through the outer peripheral passage 243, and further through the radial hole 226 of the first piston 224 becomes the third valve stem component 210. The piece 230 is pressed downward through the radial hole 228. However, since the valve N formed on the lower surface of the piece 230 is closed, there is no flow from here.

  Therefore, in FIG. 27, the compressed air flowing in the direction of arrow Q is used exclusively to move the cylinder member 240 upward. When the cylinder member 240 and the first piston 224 move upward together with the valve stem portion 17B by the compressed air in the direction of arrow Q, first, the tip end portion 224b of the first piston 224 comes into contact with the stopper member 57. . Thereby, the further movement of the 1st piston 224 is controlled. Even in this state, the cylinder member 240 is pressed in the direction of the arrow Q from below, so that the cylinder member 240 further moves toward the upper lid 56 alone while leaving the first piston 224, and the locking member 55 The locking projection 55 a is locked to the stopper member 57. Thereafter, as the pressure increases on the first port 63 side, the locking means 58 is configured as shown in FIG. Thus, when the locking means 58 is reliably configured, the upward movement of the cylinder member 240 and the valve stem portion 17B is stopped. At this time, in the valve box 4, the upward movement of the valve stem portion 17 </ b> A is completed, and the valve body 24 is disposed at the same position as the gate opening 18. When compressed air is further introduced into the first port 63 from the state of FIG. 28 in the direction of arrow P, the compressed air in the first port 63 presses the cylinder member 240 in the direction of arrow Q while From the axial hole 241 to the radial hole 242, the outer peripheral passage 243, the radial hole 244 of the second cylinder member 223, the radial hole 226 of the first piston 224, and the third valve stem component 210. It passes through the gap between the outer periphery and the inner periphery of the first piston 224, passes through the radial hole 227 of the first piston 224, and is introduced into the cylinder chamber 250 defined on the inner periphery of the cylinder member 240. The compressed air introduced into the cylinder chamber 250 presses the first piston 224 downward in the state shown in FIG. 28, so that the first piston 224 moves downward while compressing the spring 225. Then, the first piston 224 moved downward contacts the flange portion 229a of the second valve stem component 209 as shown in FIG.

  Thus, when the first piston 224 reaches a position where it abuts on the flange portion 209a of the second valve stem component 209, the radial direction formed in the third valve element component 210 that has not been communicated so far. The hole 228 communicates with the radial hole 229 of the second valve stem component 209. As a result, as shown in FIG. 29, the compressed air on the second port 62 side passes through the radial hole 229 of the second valve stem component 209 and the arrow ZZ even when the valve N is closed. It flows as shown in. As a result, the compressed air is introduced from the valve stem portion 17B into the valve stem portion 17A. Thereby, the compressed air is introduced into the pressure chamber 125 in the valve cylinder 120 in the valve box 4, the pair of pistons 118 and 119 is expanded, and the gate opening 18 is closed by the valve body 24. Become. The counter plate 25 is in contact with the outer periphery of the other gate opening 20.

  In this way, the operation from opening to closing of the gate valve 200 is completed.

  As described above, the gate valve according to another embodiment of the present invention has been described. Even in this embodiment, the control of the movement of the valve stem in the vertical direction and the movement of the valve body in the horizontal direction can be performed continuously and continuously. This can be done reliably and easily with a simple single drive / control system. Further, the structure is compact, and is particularly effective in a place where there is no installation space in the vertical direction.

FIG. 1 is a partially cutaway front view of a gate valve according to an embodiment of the present invention. 2 is a right sectional view of FIG. FIG. 3 is an enlarged cross-sectional view showing a movable part control mechanism configured in the cylinder case shown in FIG. FIG. 4 is a cross-sectional view of the first piston shown in FIG. FIG. 5 is an enlarged cross-sectional view of the cylinder member shown in FIG. FIG. 6 is an enlarged sectional view showing the structure of the joint portion of the valve stem shown in FIG. FIG. 7 is an enlarged cross-sectional view of the compressed air lead-in / out cylinder shown in FIG. FIG. 8 is an enlarged cross-sectional view of the movable part assembly shown in FIG. FIG. 9 shows the action of the movable part control mechanism in the cylinder case, and is a sectional view in an initial state in which the gate valve is opened. FIG. 10 is a cross-sectional view showing a state in which compressed air is introduced into the first port from the state of FIG. 9 and the first piston is stopped. FIG. 11 is a cross-sectional view when compressed air is further introduced from the state of FIG. 10 and the locking means of the cylinder member functions. FIG. 12 is a cross-sectional view showing a state where the movable part assembly is at the uppermost position and the gate valve is fully closed. FIG. 13 is a cross-sectional view when the discharge port of the quick discharge valve is released to close the gate valve from the closed state. FIG. 14 is a cross-sectional view when the valve stem moves downward from the state of FIG. FIG. 15 is a cross-sectional view showing a state where the locking means of the first cylinder is released from the state of FIG. 14 and the cylinder member has moved downward. FIG. 16 is an enlarged cross-sectional view showing a state where the valve rod is further lowered from the state of FIG. 15 and the gate valve is fully opened. FIG. 17 is a sectional view showing a gate valve according to another embodiment of the present invention. 18 is a side sectional view of the valve box shown in FIG. FIG. 19 is an enlarged cross-sectional view of the movable part control mechanism configured in the valve box shown in FIG. 20 is an enlarged cross-sectional view of the cylinder case shown in FIG. FIG. 21 is a partially enlarged sectional view of FIG. FIG. 22 is a cross-sectional view of the cylinder case when the gate valve according to another embodiment shown in FIG. 17 is completely closed. FIG. 23 is a cross-sectional view of the inside of the cylinder case when switching is made to release the back pressure in order to open the gate valve from the state of FIG. FIG. 24 is a cross-sectional view of the cylinder case when the compressed air is introduced into the compressed air lead-in / cylinder from the state of FIG. 23 and the compressed air is supplied into the cylinder case with a time delay. FIG. 25 is a sectional view of the inside of the cylinder case when the gate valve is completely opened. FIG. 26 is a cross-sectional view showing an initial state in the operation from the valve open state to the valve close of the gate valve according to another embodiment. FIG. 27 is a cross-sectional view of the inside of the cylinder case when switching is made to release the back pressure in order to close the gate valve from the state of FIG. FIG. 28 is a cross-sectional view of the inside of the cylinder case when compressed air is introduced into the first port from the state shown in FIG. 27 and the valve stem moves upward to the final movement region. FIG. 29 is a cross-sectional view of the inside of the cylinder case when the gate valve is completely closed. FIG. 30 is a cross-sectional view of a conventional gate valve disclosed in Japanese Patent Application Laid-Open No. 2002-181205.

Explanation of symbols

2 Gate valve 3 Seal member 4 Valve box 6 Cylinder case 8 Connecting member 12 Gap 13 Stretch body 14 Guide path 17 Valve rod 17A, 17B Valve rod portion 18, 20 Gate opening 19 Bellows 22 Movable portion assembly 23, 43 Radial direction Hole 24 Round valve body 25 Counter plate 30 Piston 31 Upper piston 31a Tip 32 Lower piston 33 Seal member mounting flange 35, 36 O-ring 37 Recess 38 First cylinder chamber 40 Recess 41 Second cylinder chamber 43, 150 Radial hole 45 Cylinder member 46 Plate body 47 Through hole 48 Nut 50a Hole portion 50b Hole portion 50b Hole portion 50 Pressure medium introduction hole 51 Upper cylindrical member 52 Lower cylindrical member 53 Screw 54 Screw 55a Locking protrusion 55 Locking Member 56 upper lid 57 stopper member 57a bulging portion 58 locking means 60 lower lid 62 first port 63 second Port 64 Spring 65, 66 Positioning step portion 68 Upper valve stem portion 69 Lower valve stem portion 71 Valve chamber 72 Block 73 Axial hole 74 Radial hole 75 Tip valve stem portion 76 Inner step portion 77 Seal member 78 Rapid discharge valve 79 Supply port 80 Discharge port 82 Nipple 83 Compressed air lead-in / out cylinder 84 Joint member 85 Lead-in port 87 Valve 88 Upper cover 89 Passage 90 Passage 91 Piping member 92 Internal space 93 Piston 95 Rod-shaped portion 96 Rod-shaped portion 97 Guide member 98 First chamber 99 Second chamber 100 Through hole 101 Axial hole 102 Valve chamber 104 Axial hole 105 Radial hole 107 Piece 108, 109 Radial hole 110 Cylinder chamber 111a Tapered surface 111 Flange 118, 119 Piston 120 Valve cylinder 121 Elastic member 122 , 123 Side plate 124 Seal member 125 Pressure chamber 126, 127 Shaft 128, 129 Side plate 130 Bellows 141, 142 Passage 143 Recess 160, 150 Radial hole 161 Valve 162 Valve 163 Seal member 165 Cylinder member 166 Passage 170 Passage 200 Gate valve 201 Flange 203 Air inlet 207 Bellows 208 Valve stem component 209a Flange portion 209 Valve rod component 210 Valve rod component 260 Connection member 261 Cylinder member 211 Piping member 219 Cover member 223 Cylinder member 224 Piston 224a Flange portion 224b Tip portions 226 and 227 Radial hole 228 Radial hole 229a Flange portion 229 Diameter Direction hole 230a Head 230 Piece 232 Seal member 233, 234 Seal member 240 Cylinder member 241 Axial hole 242 Radial hole 243 Peripheral passage 244 Radial hole 250 Cylinder chamber 251 Axial radial hole 25 2 Axial hole 253 Radial hole 254 Cylinder chamber C Movable part control mechanism

Claims (12)

A valve box having a gate opening formed between a pair of side surfaces facing each other;
A first port connected to the valve box and serving as a pressure medium supply port when the gap between the gate openings is opened and closed, and a pressure medium supply port when the gap between the gate openings is opened from close The second port is a cylinder case defined at both ends,
It is accommodated movably between the valve box and the cylinder case, and a pressure medium introduction hole is formed through it in the axial direction. Further, two radial holes are formed in the radial direction at a predetermined interval. A valve stem,
A movable part assembly including at least one valve body attached to one end of the valve stem and capable of reciprocating in a direction approaching or separating from the gate opening;
A movable part control mechanism for controlling the amount of protrusion of the valve stem into the valve box and controlling the reciprocating movement of the movable part assembly;
The movable part control mechanism is configured such that the flow of the pressure medium flowing from the first port toward the second port or the first port from the second port with the first port released to the outside. It is controlled by the flow of pressure medium flowing toward the port side of
When the movable part assembly is in the state farthest away from the gate opening and the valve stem is in the state of most movement from the gate opening, the initial position of the movable part assembly,
Due to the flow of the pressure medium supplied to the first port, the valve stem is first moved inward of the valve box, and then the movable part assembly is moved toward the gate opening. The at least one valve body provided in the movable member assembly is brought into contact with the gate opening, thereby closing the gap between the gate openings.
The pressure medium accumulated in the movable part assembly by releasing the first port from a state in which at least one of the gate openings is closed by the valve body of the movable part assembly. Is discharged to the outside through the first port released to the outside from the pressure medium introduction hole of the valve stem, and the movable part assembly is moved from the gate opening. Along with the movement, the gap between the gate openings is opened, and the valve rod is moved to the initial state position by the flow of the pressure medium supplied from that state to the second port side. Characteristic gate valve. The movable part control mechanism is
A first piston which is slidably mounted on the outer periphery of the valve stem and has two radial holes formed at a predetermined interval;
A stopper member fixedly installed in the cylinder case;
A cylinder member that is slidable with respect to the first piston and that moves to the stopper member alone after the first piston is brought into contact with the stopper member and cannot move;
A locking means configured between the stopper member and the cylinder member for limiting one movement range of the cylinder member;
A valve for opening and closing two radial holes formed in the valve stem;
The gate valve according to claim 1, comprising:   2. The gate valve according to claim 1, wherein pressure medium supply means is connected to each of the first port and the second port.   4. The gate according to claim 3, wherein a pressure medium lead-in / out cylinder is interposed between the second port and a pressure medium supply means for supplying a pressure medium to the second port. valve.   The gate valve according to claim 4, wherein the pressure medium lead-in / out cylinder is provided with a throttle valve.   The movable part assembly includes one valve body and one counter plate, and one gate opening is closed by the one valve body, and the counter plate has the other gate opening. The gate valve according to claim 1, wherein the gate valve is brought into contact with a peripheral portion of the gate valve.   The gate valve according to claim 6, wherein the counter plate is formed smaller than the valve body.     The gate valve according to claim 1, wherein the first piston has a flange portion for mounting a seal member.   The seal member mounting flange portion of the first piston includes a spring receiving portion, and a spring is interposed between the spring receiving portion and the cylinder member. The gate valve described.   A rapid discharge valve is connected between the first port and the pressure medium supply means for supplying the pressure medium to the first port, and the pressure medium is introduced from the supply port of the rapid discharge valve. The gate valve according to claim 1, wherein when the pressure medium is introduced in the reverse direction, the pressure medium is opened to the outside through the discharge port of the rapid discharge valve.     The gate valve according to claim 1, wherein the pressure medium is compressed air.     The gate valve according to claim 1, wherein the pressure medium is hydraulic.

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