KR102077270B1 - Cylinder including inner fluid pathway and gate valve using the same - Google Patents

Abstract

In order to control the pressure of the opening / closing cylinder, as the flow path is formed inside the lifting cylinder, the cylinder according to the present invention for securing the fluidity of the insertion tube installed inside the lifting cylinder has one end opened to the outside of the cylinder tube and other A piston rod having a hollow formed at the end of which is opened into the interior of the cylinder tube, an insertion tube in which one end is inserted into the hollow and a protrusion protruding from the outer circumferential surface is formed in the other end, and the pressure of the insertion tube according to pressure transmitted to the insertion tube A support groove for supporting the protrusion is formed with an inner diameter larger than the protrusion to secure fluidity, and a flow path communicating with the insertion tube is formed to include a cylinder head cover that is fastened to the cylinder tube. Smooth pressure tank of the opening / closing cylinder by keeping the insertion tube stable As well as possible, this can be obtained an effect to improve the durability of the equipment.

Description

Cylinder with internal flow path and gate valve using the same {CYLINDER INCLUDING INNER FLUID PATHWAY AND GATE VALVE USING THE SAME}

The present invention relates to a cylinder including an internal flow path and a gate valve using the same, and more particularly, to a cylinder including an internal flow path through which a piston rod of a reciprocating driven cylinder can flow and a gate valve using the same. will be.

In the display process including semiconductor process, development of new materials and high-functional materials, and manufacturing process of aviation parts and nano devices, the process is performed in an environment in which vacuum is maintained. In particular, with the rapid development of the semiconductor industry in recent years, the corresponding vacuum industry is emerging as a core technology, and the development of the vacuum industry is rapidly developing into an industry that creates high added value.

One of the essential elements of the vacuum industry is a gate valve, which can separate the vacuum chambers in which a unit process is performed in a vacuum atmosphere by pressure, and also plays a role of blocking the outside, and sometimes has a constant pressure maintenance function. I have it.

The general gate valve may be composed of a valve body having an opening, a gate for opening and closing the opening, an opening and closing cylinder for driving the gate forward and backward toward the opening, and a lifting cylinder for raising and lowering the gate together with the opening and closing cylinder by lifting and driving the opening and closing cylinder. have.

In order to control the pressure of the opening and closing cylinder, such a gate valve forms a flow path for supplying or discharging fluid to the interior of the lift cylinder. Conventionally, in order to form a flow path inside the lift cylinder, a hollow is formed in the piston rod and is hollow. A flow path is formed in the interior of the elevating cylinder by installing a separate insertion tube inside the interior.

At this time, to securely support the insertion tube installed inside the elevating cylinder, and to prevent the pressure inside the cylinder from leaking through the joint between the insertion tube and the cylinder head cover, the insertion tube is welded to the cylinder head cover or bolted. Fix the insertion tube by fastening.

However, due to vibration due to reciprocating driving of the piston rod, concentricity between the piston rod and the insertion pipe, pressure acts on the insertion pipe, and when this pressure accumulates, the joint between the insertion pipe and the cylinder head cover is destroyed. have.

Republic of Korea Registered Patent No. 1317696 (Announcement of October 15, 2013)

An object of the present invention is to provide a cylinder and a gate valve using the same for securing the fluidity of the insertion tube installed in the interior of the elevating cylinder, by forming a flow path inside the elevating cylinder to adjust the pressure of the opening and closing cylinder .

The cylinder according to the present invention is a piston rod having one end open to the outside of the cylinder tube and the other end open to the inside of the cylinder tube, one end is inserted into the hollow, and the other end is formed with a protrusion projecting from the outer circumferential surface. A support groove for supporting the protrusion is formed with an inner diameter larger than the protrusion so that fluidity of the insertion tube is secured according to the pressure delivered to the insertion tube and the insertion tube, and a flow path communicating with the insertion tube is formed to form the cylinder It may include a cylinder head cover fastened to the tube.

The cylinder head cover is formed with a through hole through which the insertion tube penetrates, and the support groove is formed in a form in which a cover body part fastened to the cylinder tube and one surface facing the cover body part are recessed and fastened to the cover body part, It may include a fastening portion in which the flow path is opened to the support groove.

The through hole has an inner diameter larger than the outer diameter of the insertion tube so that the fluidity of the insertion tube is secured with respect to the pressure transmitted in the radial direction of the insertion tube, and the insertion tube with respect to the pressure transmitted in the longitudinal direction of the insertion tube The support groove may have a depth greater than the thickness of the protrusion so as to ensure the fluidity of the.

The cylinder may further include a first seal disposed between one surface of the protrusion facing the cover body part and the cover body part, and a second sealing between the back surface of the protrusion facing the fastening part and the support groove.

The first sealing and the second sealing may be made of an elastic material to be stretchable when the insertion tube flows with respect to the pressure transmitted in the longitudinal direction of the insertion tube.

The cylinder further comprises a cylinder rod cover facing the cylinder head cover and fastened to the cylinder tube and a piston disposed in the cylinder tube to be reciprocally driven in the longitudinal direction of the cylinder tube, , The cover body portion is formed with a first pressure control flow path for pressure control for reciprocating driving of the piston rod, and the cylinder rod cover is formed with a second pressure to form a pressure opposite to the pressure formed through the first pressure control flow path A pressure regulating flow passage may be formed.

The protrusion may be a fastening ring having an outer diameter larger than the outer diameter of the insertion tube and screwed to the other end of the insertion tube.

The protrusion may be a protrusion protruding integrally formed from the other end of the insertion tube so as to have an outer diameter larger than the outer diameter of the insertion tube.

On the other hand, the gate valve according to the present invention is a valve body formed with an opening, a gate disposed inside the valve body to open and close the opening, an opening and closing cylinder supporting the gate and forward / reverse the gate toward the opening, and It includes a lifting cylinder for supporting the opening and closing cylinder and elevating the opening and closing cylinder, wherein the lifting cylinder is a piston rod having one end open to the outside of the cylinder tube and the other end open to the inside of the cylinder tube, the piston rod having one end A support groove that is inserted into the hollow and has a larger inner diameter than the protrusion so as to secure the fluidity of the insertion tube according to the pressure through the insertion pipe and the pressure to be transmitted to the insertion pipe at which the protrusion protrudes from the outer circumferential surface is formed. This is formed, the flow path communicating with the insertion tube is formed A flow path connected to the insertion tube and the hollow, including a cylinder head cover fastened to the cylinder tube, may be used as a flow path for adjusting the pressure of the opening and closing cylinder.

The elevating cylinder is provided in a pair, and a flow path formed in any one of the pair of elevating cylinders communicates with the inside of the opening / closing cylinder to be used as a pressure supply channel for advancing the gate, and among the pair of elevating cylinders The flow path formed in the other one may be used as a pressure discharge flow path for discharging the pressure inside the opening and closing cylinder when pressure is supplied to the inside of the opening and closing cylinder through the pressure supply flow path.

In order to connect the opening / closing cylinder to the pair of lifting cylinders, a lifting block is respectively connected to the pair of piston rods, and the pressure supply passage passes through any one of the pair of lifting blocks, and the pressure The discharge passage may penetrate the other of the pair of lifting blocks.

The cylinder according to the present invention and the gate valve using the same can form a flow path inside the elevating cylinder to control the pressure of the opening / closing cylinder. By maintaining a stable support state of the insertion tube inside, it is possible not only to smoothly regulate the pressure of the opening and closing cylinder, but also to derive the effect of improving the durability of the equipment.

1 is a perspective view showing a gate valve according to an embodiment of the present invention.
2 is an exploded perspective view showing a gate valve according to an embodiment of the present invention.
Figure 3 is a cross-sectional perspective view of the lifting cylinder of the gate valve according to an embodiment of the present invention.
4 is a cross-sectional view schematically showing a pressure flow of a gate valve according to an embodiment of the present invention.

The terms or words used in the specification and claims should not be interpreted as being limited to ordinary or dictionary meanings, and the inventor can appropriately define the concept of terms in order to best describe his or her invention. Based on the principle that it should be interpreted as meanings and concepts consistent with the technical spirit of the present invention. Therefore, the configuration shown in the embodiments and drawings described in this specification is only an embodiment of the present invention and does not represent all of the technical spirit of the present invention, and there may be various equivalents and modifications that can replace them. It should be understood that there is.

Hereinafter, a gate valve according to the present invention will be described with reference to the accompanying drawings.

1 is a perspective view showing a gate valve according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a gate valve according to an embodiment of the present invention.

1 and 2, the gate valve 100 according to an embodiment of the present invention may include a valve body 200, a gate 300 and an opening / closing cylinder 400.

The valve body 200 may be provided in an enclosure shape in which the upper / lower portions are opened and closed by the upper plate 210 and the lower plate 220. A pair of openings 230 communicating in the front / rear direction may be formed in the valve body 200. Of course, between the upper plate 210 and the upper surface of the valve body 200 and between the lower plate 220 and the lower surface of the valve body 200, the first sealing for maintaining airtightness inside the valve body 200 ( 211) and the second sealing 221 may be installed. Also, as the valve body 200 is disposed between the vacuum chambers (not shown), in order to maintain airtightness between the valve body 200 and the vacuum chambers (not shown), the front and rear surfaces of the valve body 200 are maintained. The third sealing 231 in a form surrounding the edge of the opening 230 may be respectively installed.

The gate 300 may have a larger area than the opening 230 corresponding to the opening 230 formed in the valve body 200. The gate 300 may be disposed inside the valve body 200. Of course, a fourth sealing 310 for maintaining airtightness between the gate 300 and the valve body 200 may be installed on one side of the gate 300 facing the valve body 200.

The opening / closing cylinder 400 is disposed inside the valve body 200 and behind the gate 300. The opening / closing cylinder 400 drives the gate 300 forward / backward toward the opening 230. The internal configuration of the opening / closing cylinder 400 is already well-known and well-known in the art, so a detailed description of the configuration will be omitted.

As such, the gate 300 is supported by the opening / closing cylinder 400, and may open or close the opening 230 formed in the valve body 200 according to the reciprocating driving of the opening / closing cylinder 400. The opening and closing cylinder 400 may increase or decrease the number of the gate 300 in consideration of the size of the gate 300 and the individual output of the opening and closing cylinder 400.

On the other hand, the gate valve 100, with the reciprocating driving of the gate 300 by the opening and closing cylinder 400, the gate 300 in the passage of the opening 230 in communication with each other must be completely separated vacuum chambers (not shown) The board can be exchanged or entered. Therefore, the gate valve 100 should be configured to elevate the opening / closing cylinder 400 supporting the gate 300.

To this end, the gate valve 100 may include a first lifting cylinder 500 and a second lifting cylinder 600.

3 is a cross-sectional perspective view of a lifting cylinder of a gate valve according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view briefly showing a pressure flow of a gate valve according to an embodiment of the present invention.

3 and 4, the first lifting cylinder 500 and the second lifting cylinder 600 support the support frame 700 together.

The first lifting cylinder 500 includes a first lifting cylinder head cover 510, a first lifting cylinder tube 520, a first lifting cylinder rod cover 530, a first lifting piston 540, and a first lifting piston rod. It may include (550).

The first lifting cylinder head cover 510 is disposed under the valve body 200. The first elevating cylinder tube 520 extends from the rim of the first elevating cylinder head cover 510 toward the valve body 200. The first lifting cylinder rod cover 530 is fastened to the open section of the first lifting cylinder tube 520 to close the inside of the first lifting cylinder 500. The first lifting piston 540 is disposed inside the first lifting cylinder tube 520. The first elevating piston rod 550 is connected to the first elevating piston 540 and penetrates the first elevating cylinder rod cover 530 and is exposed toward the valve body 200. The first lifting piston 540 is driven up and down according to the pressure inside the first lifting cylinder 500, and the first lifting piston rod 550 is driven up and down according to the lifting driving of the first lifting piston 540.

The first lifting block 560 is fastened to the upper portion of the first lifting piston rod 550 exposed to the outside. The first lifting block 560 may be elevated together with the first lifting piston rod 550. The first lifting block 560 is connected to the opening / closing cylinder 400.

Here, since the detailed configuration of the second lifting cylinder 600 is symmetrical to the detailed configuration of the first lifting cylinder 500, a detailed description of the detailed configuration of the second lifting cylinder 600 will be omitted. However, for the detailed configuration of the second elevating cylinder 600, a separate reference numeral from the detailed constitution of the first elevating cylinder 500 will be assigned to distinguish the pressure pressure discharge passage and the pressure discharge passage, which will be described later.

Subsequently, the second lifting cylinder 600 includes a second lifting cylinder head cover 610, a second lifting cylinder tube 620, a second lifting cylinder rod cover 630, a second lifting piston 640, and a second lifting cylinder. It may include a lifting piston rod (650). In addition, the second lifting block 660 is fastened to the upper portion of the second lifting piston rod 650. The second lifting block 660 may be elevated together with the second lifting piston rod 650. The first lifting block 560 is connected to the opening / closing cylinder 400.

Here, the first pressure control flow path 501 between the first lifting cylinder head cover 510 and the first lifting piston 540 and between the second lifting cylinder head cover 610 and the second lifting piston 640 Is formed, between the first lifting cylinder rod cover 530 and the first lifting piston 540 and between the second lifting cylinder rod cover 630 and the second lifting piston 640, the second pressure regulating flow path ( 502) are formed respectively. A first pressure regulating pipe 501a is fastened to the first pressure regulating flow passage 501, and a second pressure regulating pipe 502a is fastened to the second pressure regulating flow passage 502.

When pressure is supplied through the first pressure regulating tube 501a and the first pressure regulating flow passage 501, the first elevating cylinder 500 and the second elevating cylinder 600 may raise and close the opening and closing cylinder 400. . Conversely, when the pressure of the first pressure regulating pipe 501a and the first pressure regulating flow passage 501 is released and the pressure is supplied through the second pressure regulating pipe 502a and the second pressure regulating flow passage 502, the first The lifting cylinder 500 and the second lifting cylinder 600 may lower the opening / closing cylinder 400.

As such, the opening / closing cylinder 400 and the gate 300 may be elevated together by the first lifting cylinder 500 and the second lifting cylinder 600.

Here, the flow path for supplying pressure to the inside of the opening and closing cylinder 400 for reciprocating driving of the opening and closing cylinder 400, and for discharging the internal pressure of the opening and closing cylinder 400, the first lifting cylinder 500 and the second lifting It can be formed in the interior of the cylinder 600.

That is, a first hollow 551 may be formed in the first lifting piston rod 550, and a first insertion tube 552 may be inserted into the first hollow 551. The first insertion pipe 552 is supported by the first lifting cylinder head cover 510, and the first lifting cylinder head cover 510 has a first pressure pressure discharge passage 510a communicating with the first insertion pipe 552. Is formed. A pressure supply pipe 510b may be fastened to the first pressure pressure discharge channel 510a.

In addition, a second pressure supply passage 561 communicating with the first hollow 551 is formed in the first lifting block 560. The second pressure supply flow path 561 is opened into the opening and closing cylinder 400.

Therefore, the pressure supplied through the pressure supply pipe (510b), the opening and closing cylinder through the first pressure supply flow path (510a), the first insertion pipe 552, the first hollow 551 and the second pressure supply flow path (561) ( 400), and accordingly, the opening / closing cylinder 400 may advance the gate 300.

Meanwhile, when the opening / closing cylinder 400 is driven forward, the pressure inside the opening / closing piston 400 should be discharged to the outside.

To this end, a first pressure discharge flow path 661 communicating with the inside of the opening / closing cylinder 400 is formed inside the second lifting block 660. The first pressure discharge flow path 661 communicates with the second hollow 651 formed in the second lifting piston rod 650. A second insertion pipe 652 is inserted into the second hollow 651, and the second insertion pipe 652 is supported by the second lifting cylinder head cover 610. The second lifting cylinder head cover 610 is formed with a second pressure discharge passage 610a communicating with the second insertion pipe 652. A pressure discharge pipe 610b may be fastened to the second pressure discharge flow path 610a.

Accordingly, when the opening / closing cylinder 400 is driven forward, the pressure inside the opening / closing cylinder 400 is the first pressure regulating flow path 502, the second hollow 651, the second insertion pipe 652, and the second pressure discharge flow path. It may be discharged to the outside of the opening and closing cylinder 400 through the (610a) and the pressure discharge pipe (610b).

As described above, a first insertion pipe 552 inserted into the first elevating cylinder 500 is included in a flow path for supplying pressure into the opening and closing cylinder 400 for reciprocating driving of the opening and closing cylinder 400. The flow path for discharging the internal pressure of the opening / closing cylinder 400 includes a second insertion pipe 652 formed inside the second lifting cylinder 600.

At this time, the first insertion pipe 552 inserted into the first hollow 551 is affected by the reciprocating driving of the first lifting piston rod 550, and the second insertion pipe 652 inserted into the second hollow 651 ) May be affected by reciprocating driving of the second lifting piston rod 650.

Accordingly, the gate valve 100 has a first protruding portion 553 and a second protruding portion 653 formed at the lower end portion of the first insertion pipe 552 and the lower end portion of the second insertion pipe 652, respectively. The structures of the first lifting cylinder head cover 510 and the second lifting cylinder head cover 610 are improved.

That is, the first lifting cylinder head cover 510 may include a first cover body portion 511 and a first fastening portion 512. The first cover body part 511 may be fastened to the lower end of the first lifting cylinder tube 520. The first fastening part 512 may be fastened to the first cover body part 511. A first through hole 511a through which the first insertion tube 552 penetrates may be formed in the first cover body part 511. The first through hole 511a has an inner diameter larger than the outer diameter of the first insertion tube 552 so that the fluidity of the first insertion tube 552 can be secured even in the pressure transmitted in the radial direction of the first insertion tube 552. It is desirable to have.

In addition, a first support groove 512a may be formed on one surface of the first fastening portion 512 facing the first cover body portion 511. Likewise, the first support groove 512a is larger than the outer diameter of the first protrusion 553 so that fluidity of the first insertion tube 552 can be secured even in the pressure transmitted in the radial direction of the first insertion tube 552. It can have an inner diameter. In addition, the depth of the first support groove 512a is greater than the thickness of the first protrusion 553 so that the fluidity of the first insertion tube 552 can be secured even in the pressure transmitted in the longitudinal direction of the first insertion tube 552. Large is preferred. At this time, a first buffering seal may be disposed between one surface of the first protrusion 553 facing the first cover body part 511 and the first cover body part 511, and the first fastening part 512 may be disposed. A second buffer seal 555 may be disposed between the back surface of the first protruding portion 553 and the first support groove 512a. It is preferable that the first buffer seal 554 and the second buffer seal 555 are made of an elastic material so that the first insertion pipe 552 is stretchable when flowing in the longitudinal direction.

Similarly, since the detailed configuration of the second lifting cylinder head cover 610 is symmetrical to the detailed configuration of the first lifting cylinder head cover 510, detailed description of the detailed configuration of the second lifting cylinder head cover 610 is omitted. For the detailed configuration of the second elevating cylinder head cover 610 in order to distinguish the above-described pressure supply flow path from the pressure discharge flow path, a separate reference numeral from the detailed configuration of the first elevating cylinder head cover 510 is given. I will do it.

The second lifting cylinder head cover 610 includes a second cover body portion 611 and a second fastening portion 612. A second through hole 611a is formed in the second cover body portion 611. A second support groove 612a is formed in the second fastening portion 612. A third buffer seal 654 and a fourth buffer seal 655 are installed in the second protrusion 653.

Thus, the gate valve 100 is provided with a first protrusion 553 at the lower end of the first insertion tube 552 and a second protrusion 653 at the lower end of the second insertion tube 652, and the first lifting By improving the structure of the cylinder head cover 510 and the second lifting cylinder head cover 610, it is possible to transmit smooth pressure through the first insertion pipe 552 and the second insertion pipe 652, and the first In addition to stably supporting the insertion tube 552 and the second insertion tube 652, it is possible to improve the durability of the first insertion tube 552 and the second insertion tube 652.

On the other hand, in the above description, the pressure supply flow paths have been described with respect to an embodiment using the internal flow path of the first elevating cylinder 500 and the internal flow path of the second elevating cylinder 600. The internal flow path of the two elevating cylinder 600 is used, and the pressure discharge flow paths may be modified to make the internal flow path of the first elevating cylinder 500.

The embodiments of the present invention described above and illustrated in the drawings should not be interpreted as limiting the technical spirit of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and a person having ordinary knowledge in the technical field of the present invention can improve and modify the technical spirit of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention as long as it is apparent to those skilled in the art.

100: gate valve 200: valve body
300: gate 400: opening and closing cylinder
500: first elevating cylinder 501: first pressure regulating flow path
501a: first pressure regulating tube 502: second pressure regulating flow passage
502a: 2nd pressure regulating tube 510: 1st lifting cylinder head cover
510a: 1st pressure supply flow path 510b: Pressure supply pipe
511: first cover body portion 511a: first through hole
512: first fastening section 512a: first support groove
520: first lifting cylinder tube 530: first lifting cylinder rod cover
540: first lifting piston 550: first lifting piston rod
551: 1st hollow 552: 1st insertion tube
553: 1st protrusion 554: 1st buffer sealing
555: 2nd buffer sealing 560: 1st lifting block
561: 2nd pressure supply flow path
600: second lifting cylinder 610: second lifting cylinder head cover
610a: Second pressure discharge flow path 610b: Pressure discharge pipe
611: second cover body portion 611a: the second through hole
612: 2nd fastening part 612a: 2nd support groove
620: 2nd lifting cylinder tube 630: 2nd lifting cylinder rod cover
640: 2nd lifting piston 650: 2nd lifting piston rod
651: 2nd hollow 652: 2nd insertion tube
653: 2nd protrusion 654: 3rd buffer sealing
655: 4th buffer sealing 660: 2nd lifting block
661: 1st pressure discharge flow path

Claims (11)

A piston rod having one end open to the outside of the cylinder tube and another end open to the inside of the cylinder tube;
One end is inserted into the hollow is constrained to the piston rod and the other end is formed with a protruding portion protruding from the outer peripheral surface; And
A support groove is formed having a larger inner diameter than the protrusion and supports the protrusion so that the fluidity of the insertion tube is secured even at the pressure transmitted from the piston rod to the insertion tube, and a flow path communicating with the insertion tube is formed so that the cylinder It includes a cylinder head cover fastened to the tube;
The cylinder head cover
A cover main body having an inner diameter larger than the outer diameter of the insertion tube and having a through hole through which the insertion tube penetrates to be secured to the cylinder tube so that fluidity of the insertion tube is secured against pressure transmitted in the radial direction of the insertion tube; And
The support groove, which is recessed to a depth greater than the thickness of the protrusion, is formed so as to secure the fluidity of the insertion tube with respect to the pressure transmitted in the longitudinal direction of the insertion tube, and is fastened to the cover body, and is opened to the support groove. It includes; a fastening portion in which the flow path is formed,
A first buffering seal disposed between one surface of the protruding portion facing the cover body portion and the cover body portion, and performing a cushioning function and a sealing function between the cover body portion and the protruding portion when the projecting portion moves in a plane; and
And a second buffering seal disposed between the rear surface of the protrusion toward the fastening part and the support groove, and performing a cushioning function and a sealing function between the fastening part and the protrusion when the protrusion moves in a plane. Cylinder comprising an inner flow path. delete delete delete According to claim 1,
The first buffer seal and the second buffer seal
Cylinder comprising an inner flow path, characterized in that it is made of an elastic material so as to be stretchable when the flow of the insertion tube against the pressure transmitted in the longitudinal direction of the insertion tube. According to claim 1,
A cylinder rod cover facing the cylinder head cover and fastened to the cylinder tube; And
The piston is fastened to the piston rod and is disposed inside the cylinder tube so as to be reciprocally driven in the longitudinal direction of the cylinder tube.
A first pressure regulating flow path for regulating pressure for reciprocating driving of the piston rod is formed in the cover body part,
A cylinder including an inner flow path, characterized in that a second pressure regulating flow path forming a pressure opposite to the pressure formed through the first pressure regulating flow path is formed in the cylinder rod cover. According to claim 1,
The protrusion is
Cylinder having an outer diameter larger than the outer diameter of the insertion tube, characterized in that the fastening ring is screwed to the other end of the insertion tube. According to claim 1,
The protrusion is
A cylinder including an inner flow path, characterized in that it is a protruding jaw integrally formed from the other end of the insertion tube so as to have an outer diameter larger than the outer diameter of the insertion tube. A valve body having an opening;
A gate disposed inside the valve body to open and close the opening;
An opening / closing cylinder supporting the gate and moving the gate forward / backward toward the opening; and
It includes; lifting cylinder for supporting the opening and closing cylinder and elevating the opening and closing cylinder;
The lifting cylinder
A piston rod having one end open to the outside of the cylinder tube and another end open to the inside of the cylinder tube;
One end is inserted into the hollow is constrained to the piston rod and the other end is formed with a protruding portion protruding from the outer peripheral surface; And
A support groove is formed having a larger inner diameter than the protrusion and supports the protrusion so that the fluidity of the insertion tube is secured even at the pressure transmitted from the piston rod to the insertion tube, and a flow path communicating with the insertion tube is formed so that the cylinder It includes a cylinder head cover fastened to the tube;
The cylinder head cover
A cover main body having an inner diameter larger than the outer diameter of the insertion tube and having a through hole through which the insertion tube penetrates to be secured to the cylinder tube so that fluidity of the insertion tube is secured against pressure transmitted in the radial direction of the insertion tube; And
The support groove is recessed to a depth greater than the thickness of the protrusion so that the fluidity of the insertion tube is secured against the pressure transmitted in the longitudinal direction of the insertion tube is fastened to the cover body, and is opened to the support groove It includes; a fastening portion in which the flow path is formed,
A first buffering seal disposed between one surface of the protruding portion facing the cover body portion and the cover body portion, and performing a cushioning function and a sealing function between the cover body portion and the protruding portion when the protruding portion is moved in a plane; and
Including a second buffering seal disposed between the back surface of the projection toward the fastening portion and the support groove, and performs a buffer function and a sealing function between the fastening portion and the projection when the projection moves in a plane.
A gate valve, characterized in that the insertion pipe and the flow path connected to the hollow are used as a flow path for adjusting the pressure of the opening and closing cylinder. The method of claim 9,
The lifting cylinder is provided in a pair,
The flow path formed in any one of the pair of lifting cylinders communicates with the inside of the opening / closing cylinder and is used as a pressure supply flow path for advancing the gate.
A flow path formed in the other of the pair of lifting cylinders is a gate valve, characterized in that when the pressure is supplied to the inside of the opening and closing cylinder through the pressure supply passage, as a pressure discharge passage for discharging the pressure inside the opening and closing cylinder . The method of claim 10,
In order to connect the opening and closing cylinders to the pair of lifting cylinders, lifting blocks are respectively connected to the pair of piston rods,
The pressure supply passage passes through any one of the pair of lifting blocks,
The pressure discharge passage gate valve, characterized in that through the other of the pair of lifting blocks.

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