KR100827347B1 - A valve open/close apparatus of screw assembling type - Google Patents

Abstract

The present invention relates to a screw-assembled valve opening and closing device comprising: a housing configured by assembling an upper cover and a lower body with each other as a screw, a cam shaft penetrated downwardly inside the housing, and an operation cam fixed to the cam shaft and interlocked with the cam shaft; In the screw-mounted valve opening and closing device comprising a controller for controlling the valve opening and closing according to the operation of the on / off switch terminal, and the on / off switch terminal operating by the operation cam, the upper portion of the upper cover A valve opening and closing indicator in which the valve opening and closing display plate is rotatably inserted; A cam shaft hole formed on an upper surface of the upper cover; A double stem consisting of a guide stem and a holder stem is configured between the cam shaft hole and the cam shaft so that the valve opening / closing indicator can be installed on the upper cover, and the user can assemble the upper cover and the lower body in the field to install the screw-type valve opening and closing device. In addition to completing the above, there is an advantage in that the assembly of the upper cover in the screw-type valve opening and closing device to match the point on the opening or closing of the valve opening and closing display plate.

Valve switchgear, stem, indicator, housing, holder, guide, camshaft, clamp, stopper

Description

A valve open / close apparatus of screw assembling type

1 is a perspective view of the screw assembly valve opening and closing device of the present invention.

2 is an exploded perspective view of a double stem structure according to the present invention.

Figure 3 is a cross-sectional view before assembly of the double stem structure according to the present invention.

4 is a cross-sectional view after assembling the double stem structure according to the present invention.

5 is an exploded perspective view of an assembly bolt according to the present invention;

Figure 6 is a tightening state diagram of the assembly bolt according to the present invention

Figure 7 is a loosened state of the assembly bolt according to the present invention

* Explanation of symbols for the main parts of the drawings *

11: housing 12: lower body

13: top cover 15: limit switch

16: On-switch terminal 17: Off-switch terminal

18: camshaft 22, 23: working cam

23: spring 24: guide stem

25: holder stem 26: female thread

27: male 28: camshaft

29: stem assembly 30: on-off valve indicator

31: casing 32: opening

34: valve opening and closing display board 35: axis of rotation

38,39: bolt connection 40: kick clamp bolt

42: bolt spring 47: stopper

The present invention relates to a screw-assembled valve opening and closing device, and more particularly, to a screw-assembled valve opening and closing device that can install the on-off valve indicator on the upper cover by extrapolating the double stem to the camshaft.

The screw assembly valve opening and closing device of the prior art is that the on-off valve installed on the passage through which the fluid passes through the limit switch is connected to the opening or closing of the passage by opening or closing the passage while the limit switch is connected to operate the on / off valve According to the on / off operation, it sends a signal to the controller, and the valve opening and closing indicator is configured at the bottom.

The screw-assembled valve opening and closing device is composed of a housing consisting of the assembly of the upper cover and the lower body, the valve opening and closing indicator is fixed to the lower housing by a separate casing.

An on / off switch terminal is provided inside the housing, a cam shaft through which the housing penetrates up and down, and a lower end thereof is connected to the operation shaft of the valve, and an operation of operating the on / off switch terminal while being installed on the cam shaft and rotating with the cam shaft. The cam is constructed.

The housing has a cylindrical shape and is coupled to the valve via a bracket.

The upper cover has a cylindrical shape, and a female screw is formed on the circumferential surface of the inner diameter, the lower body has a cylindrical shape, and a male thread is formed on the circumferential surface of the outer diameter, thereby tightening the upper cover and the lower body by tightening the female screw and the male screw. Are assembled together.

The valve opening and closing indicator is fixed to the lower body of the lower body by a bracket, and the valve opening and closing valve which can visually check the opening and closing state of the valve is inserted into the casing.

The housing is sealed by interlocking with the male screw of the lower body and the female screw of the upper cover, and the inner cover is sealed and explosion-proof by tightly assembled by screwing the lower end of the circumferential surface of the inner diameter of the upper cover and the upper end of the circumferential surface of the outer body. Cotton is formed.

By the way, when the valve opening and closing valve is installed in the upper cover, the valve opening and closing valve of the valve opening and closing indicator also rotates due to the rotation of the upper cover when the housing is assembled. Couldn't assemble to match the point.

In addition, the screw assembly valve opening and closing device of the prior art may adopt a method of assembling the valve opening and closing indicator on the upper portion of the upper cover after installing the housing assembled in the field on the fluid conduit, but the user can use the valve opening and closing display panel Not only was it difficult to match the point of opening or closing, but there was a problem that included risks and problems that caused inconvenience to users.

In addition, the screw assembly valve opening and closing device of the prior art, when disassembling the upper cover for defects of the valve opening and closing device to rotate the assembly bolts sufficiently, even if the assembly bolts are completely released, it is possible to know whether the assembly bolts are completely loosened. As a result, the threaded portion of the bolted portion could be damaged by continuously rotating the assembly bolt.

In addition, the conventional screw-assembled valve opening and closing device is difficult to rotate the upper cover when the assembly bolt is caught by the lower body when the upper cover is rotated to lock the upper cover to the lower body.

In addition, the screw assembly valve opening and closing device of the prior art has the most safety explosion-proof structure, but the valve opening and closing indicator is configured at the bottom of the valve is not easy to identify the user's eyes it was difficult to check the opening and closing state of the valve. .

  Accordingly, the present invention has been made in order to solve the above problems, the object is to form a cam shaft hole in the upper surface of the upper cover and to open and close the upper cover by configuring a double stem between the cam shaft hole and the cam shaft It is an object of the present invention to provide a screw-mounted valve opening and closing device configured as a valve indicator and fastening an upper cover and a lower body as a kick clamp bolt.

 In order to achieve the above object, the present invention provides a housing configured by assembling the upper cover and the lower body as screws and assembly bolts, a cam shaft installed through the lower portion of the housing, and fixed to the cam shaft and interlocked with the cam shaft. A screw-assembled valve opening and closing device comprising a cam, an on / off switch terminal operated by an actuating cam, and a controller for controlling valve opening and closing according to the operation of the on / off switch terminal, wherein the valve opening and closing display plate is located on the upper portion of the upper cover. A valve opening and closing indicator which is rotatably inserted; A cam shaft hole formed on an upper surface of the upper cover; It relates to a double stem between the cam shaft hole and the cam shaft.

The dual stem may include a guide stem having a hollow inner diameter formed therein and inserted into the cam shaft hole inner diameter, and a holder stem having a hollow inner diameter formed therein and inserted into the inner diameter of the guide stem.

In addition, the holder stem is in the shape of a jaw ring groove that the outer ring is extrapolated to the circumferential surface of the outer diameter;

In addition, the cam shaft hole is a projection formed on the circumferential surface of the inner diameter; The guide stem is a groove formed in the circumferential surface of the outer diameter; relates to the configuration.

In addition, the assembly bolt is a bolt lower body extending to the bolt head is configured, the end of the bolt lower body is configured with a bolt or a cover thread, and the bolt spring is extrapolated between the bolt head and the bolt screw.

In addition, the bolt spring is an outer diameter toward the center, the larger the pressurized coil spring.

In addition, the screw fastening end of the lower body bolt connection portion relates to a stopper is configured.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 to 4, in order to achieve the above object, the present invention includes a housing 11 coupled to the valve using a bracket, and a valve opening and closing indicator for displaying a valve opening and closing on an upper portion of the housing 11. It is composed.

The housing 11 consists of a lower body 12 and an upper cover 13 which are assembled to each other as screws and assembly bolts. The upper cover 13 includes a cam shaft hole 28, In particular, the lower body 12 has a dual stem composed of a guide stem 24 and a holder stem 25 between the cam shaft hole 28 and the cam shaft 18, and on / off inside the housing 11. The switch shaft 16 and 17, the cam shaft 18 penetrating the housing 11 up and down and connected to the operation shaft of the valve, and the cam shaft 18 is rotated together with the cam shaft 18 Operation cams 21 and 22 for activating the on / off switch terminals 16 and 17 are configured.

The housing 11 has a cylindrical shape and consists of a lower body 12 and an upper cover 13. The upper cover 13 has a cylindrical shape and a female screw 26 is formed on the circumferential surface of the inner diameter. The lower body 12 has a cylindrical shape, and a male screw 27 is formed on the circumferential surface of the outer diameter.

The female screw 26 of the upper cover 13 and the male screw 27 of the lower body 12 are not absolute, and the male screw 27 of the upper cover 13 may form the female screw 26 of the lower body 12. It could be.

The upper cover 13 is provided with a valve opening and closing indicator for displaying the valve opening and closing while interlocking with the cam shaft (18).

The valve opening and closing indicator is fixed to the upper cover 13 by a hemispherical casing 31, an opening 32 is formed in a part of the outer wall of the casing 31, the inside of the casing 31 of the valve A valve opening / closing display plate 34 capable of visually confirming the open / close state is rotatably inserted, and a rotating shaft 35 interlocking with the cam shaft 18 while rotating the valve opening / closing display panel 34 is configured.

The lower end of the casing 31 is formed with a bolt fastening portion 14-1 protruding with a bolt hole formed at the center thereof, and a bolt fastening formed with a bolt hole formed at the center of the upper cover 13 as well. The part 14 is comprised.

The bolt fastening portions 14 and 14-1 are formed at four corners, and the bolt fastening portions 14-1 of the casing 31 coincide with the bolt fastening portions 14 of the upper cover 13. The inside of the casing 31 is sealed by being fastened.

The number of the bold fastening portions 14, 14-1 is not absolute, and the number can be reduced or increased by any amount in consideration of the assembly area of the upper cover 13 or the like.

 The cam shaft 18 penetrates up and down the housing 11 so that the lower end is connected to the valve shaft of the valve and rotates in conjunction with the opening and closing operation of the valve. A double stem is formed at the upper end of the cam shaft 18, a valve opening and closing indicator is coupled to the upper end of the cam shaft 18, and actuating cams 21 and 22 are coupled to a central portion of the cam shaft 18.

The tip of the cam shaft 18 protruding through the casing 31 of the valve opening and closing indicator is inserted and fixed in the direction of the central axis of the valve opening and closing display plate 34.

Accordingly, the valve opening and closing display plate 34 may visually check the opening and closing state of the valve while interlocking according to the opening and closing action of the opening and closing plate (not shown) of the valve coupled to the bottom surface of the housing 11.

That is, the valve opening / closing display plate 34 also rotates together with the valve by the camshaft 18 interlocked as the valve engages, and the opening / closing state of the valve is externally displayed through the opening 32 of the casing 31. Will be.

In the lower body 12, a limit switch 15 is installed to be adjacent to the operation cams 21 and 22, and a wiring connector is electrically connected to the limit switch 15 through a cable, and the housing 11 It is coupled to the lower body 12).

 The male screw 27 of the lower body 12 and the female screw 26 of the upper cover 13 are engaged with each other to rotate to seal the inside of the housing 11, and the lower end of the inner circumferential surface of the inner diameter of the upper cover 13 and the lower body. An explosion-proof surface is formed by mutually assembling by screwing the upper end part of the outer peripheral surface of outer diameter of (12).

The actuating cams 21 and 22 are coupled to the camshaft 18 to rotate together with the camshaft 18, and operate the on / off switch terminals of the limit switch 15 in accordance with the opening and closing operation of the valve.

The limit switch 15 is provided in the lower body 12 of the housing 11 and has on / off switch terminals 16 and 17 in the form of a leaf spring 23 that is mechanically operated.

The limit switch 15 is connected to the controller according to the open / closed state of the valve, while the ON and OFF operation switch terminals are operated by the operation cams 21 and 22, respectively. It sends a signal.

On the upper part of the upper cover 13, a valve opening / closing indicator in which the valve opening / closing display plate 34 is rotatably inserted is formed, and a stem assembly 29 having a cam shaft hole 28 therethrough is formed.

 The camshaft hole 28 is configured with the camshaft 18. A double stem is disposed between the camshaft hole 28 and the camshaft 18, and a valve opening and closing indicator is formed on the upper surface of the upper cover 13. A rotating shaft 35 is formed on the cam shaft 18 to cooperate with the valve opening and closing display plate 34 so that the valve opening and closing display panel 34 rotates by the rotation of the cam shaft 18.

The dual stem is composed of a guide stem 24 and a holder stem 25, the guide stem 24 is a hollow cylindrical through the inner diameter and is inserted into the inner peripheral surface of the cam shaft hole 28, the holder stem ( 25 is a hollow cylindrical through which the inner diameter is penetrated, and the lower end constitutes a protruding flange, and is inserted into the inner circumferential surface of the guide stem 24, and the cam shaft 18 is inserted into the penetrated inner diameter of the holder stem 25.

The holder stem 25 has a hollow cylindrical shape with a penetrating inner diameter and a lower end protruding to a certain height, and the shape of the holder stem 25 is ⊥-shaped. It is engraved.

The holder stem 25, which is placed on the ring ring groove, is assembled by inserting into the inner diameter of the guide stem 24, thereby forming an explosion-proof surface between the holder stem 25 and the guide stem 24.

That is, the inner diameter of the o-ring is in close contact with the o-ring groove of the holder stem 25, and the outer diameter of the o-ring is in close contact with the inner diameter of the guide stem 24, thereby maintaining confidentiality between the holder stem 25 and the guide stem 24. Will be.

The cam shaft hole 28 has a protrusion formed on a circumferential surface of the inner diameter, and the guide stem 24 has a groove formed on the outer circumferential surface of the outer diameter.

When the guide stem 24 is inserted into the cam shaft hole 28, the groove of the guide stem 24 is bound to the projection of the cam shaft hole 28, thereby guiding the guide stem 24 to the cam shaft hole 28.

On the other hand, between the lower end of the guide stem 24 and the upper flange of the holder stem 25

O Rings or snap rings are posted, but no ring or snap rings are required.

The guide stem 24 is one-touch coupled to the cam shaft hole 28 by grooves and protrusions to rotate in the cam shaft hole 28 without deviating from the cam shaft hole 28.

The length of the cam shaft hole 28 and the length of the guide stem 24 are the same, and the length of the guide stem 24 and the holder stem 25 excluding the flange from the holder stem 25 are also the same, and the guide stem ( The inner diameter of 24 and the outer diameter of the flange of the holder stem 25 are the same.

Even though the outer diameter of the guide stem 24 and the flange outer diameter of the holder stem 25 are the same, the guide stem 24 is coupled to the cam shaft hole 28 because the guide stem 24 is one-touch coupled to the cam shaft hole 28. It does not penetrate.

The outer diameter of the flange of the holder stem 25 is not absolute, and the outer diameter of the holder stem 25 may be reduced or increased in consideration of the area of the stem assembly 29.

On the other hand, the guide hole of about 2 degrees is formed at the inner diameter end of the flange portion of the holder stem (25).

In other words, the guide is chamfered to an inner diameter of about 2 ° and the length of the chamfer is formed quite long.

According to the present invention having the above-described configuration, the on / off valve indicator 30 assembled to the upper cover 13 by being opened or closed according to the user's use is integrally assembled by a bolt, and the valve inside the on / off valve indicator 30 is The opening and closing display panel 34 is configured to interlock with the rotating shaft 35.

In the upper cover 13, the guide stem 24 is fixedly installed by turning to the inner diameter of the cam shaft hole 28 of the stem assembly 29, and the holder stem 25 of the ring ring is inserted into the guide ring groove. It is installed in the inner diameter of 24.

The guide stem 24 and the holder stem 25 are also assembled into open or immersed according to the user's use.

On the inside of the lower body 12, the cam shaft 18 and the cam shaft 18, the lower end of which penetrates up and down through the housing 11 and is connected to the operating shaft of the valve. Actuating cams 21 and 22 are installed to operate the on / off switch terminals 16 and 17 while rotating together with the cam shaft 18.

Looking at the cross-sectional view before and after assembly of the screw-type valve opening and closing device double stem structure as shown in Figure 3, 4,

 When the on-off valve indicator 30, the upper cover 13, and the lower body 12 assembled in the above state are shipped, the user will assemble the upper cover 13 to the lower body 12 at the site. When the cover 13 is turned clockwise to start locking, the camshaft 18 is naturally fitted along a 2 ° guide hole formed inside the holder stem 25, and the allowable dimension in the holder stem 25 is processed or assembled. While fully cushioning the upper cover 13 is assembled to the lower body 12 to the end.

The on-off valve indicator 30 is assembled to the upper cover 13 as a bolt, but the explosion-proof performance is improved by the holder stem 25 that is already assembled, and the upper cover 13 and the lower body 12 are screw-assembled. In the explosion-proof structure of the upper cover 13 is to be configured to be equipped with an integrated on-off valve indicator 30.

In addition, the end portion of the extension portion 12 of the upper cover 13 is formed with a bolt-shaped portion 38 is formed with a rounded ear-shaped protrusion is formed in the center of the protrusion through the hole penetrated up and down.

At the end of the extension part 15 of the lower body 12, a rounded ear-shaped protrusion is formed, and a bolt fastening part 39 having a bolt hole formed up and down is formed in the center of the protrusion.

In the state where the upper cover 13 and the lower body 12 are screwed together, the bolt fastening portion 38 of the upper cover 13 and the bolt fastening portion 39 of the lower body 12 coincide with the bolt fastening portion ( The lower body 12 and the upper cover 13 are assembled by tightening as an assembly bolt, that is, a kick clamp bolt 40 through 38 and 39.

5 to 7, the upper cover 13 has the same shape as the bowl upside down, and at the end is formed a screw fastening portion 38 protruding from the upper and lower threaded hole 45 is formed It is.

 The lower body 12 is shaped like a bowl, and a bolt fastening hole 46 is formed at the end of the lower body 12, and a bolt fastening part 39 protruding is formed by female threads formed at the bolt fastening hole 46. .

The kick clamp bolt 40 is composed of a hexagonal wrench bolt head 41 engraved in a hexagonal center of the head and a cylindrical lower bolt body 44 extending to the bolt head 41 and the lower bolt body ( 44, a male screw bolt 43 is formed at the end, and between the bolt head 41 and the bolt screw 43, a bolt spring 42 made of a compression coil is extrapolated so as not to be detached, and the bolt head 41 is removed. The loosening identification washer 48 is comprised between and the bolt spring 42. As shown in FIG.
The flat washer of the general mechanical parts is placed between the lower part of the bolt head and the threaded part and is larger than the bolt hole so that the bolt head is not inserted into the bolt hole when the bolt is tightened. However, the loosening washer 48 is a flat washer. It is inserted into the inside of the screw hole (45) of the upper cover (13) and has a larger outer diameter than the outer diameter of the end of the bolt spring (42) and somewhat larger than the outer diameter of the head of the kick clamp bolt (40).
When the upper cover 13 and the lower cover 12 are assembled (the kick clamp bolt 40 is tightened), the unlocking washer 48 is inserted into the screw hole 45 and the kick clamp bolt 40 ), The head part of the screw hole 45 is in a state of blocking the loosening identification washer 48 through the gap between the outer diameter of the kick clamp bolt 40 and the inner diameter of the screw hole 45. When the upper cover 13 and the lower cover 12 are disassembled (the kick clamp bolt 40 is released), the unlocking washer 48 is screwed by the extension of the bolt spring 42. 45) As it is exposed to the outside, it is easy to check with the naked eye.
Therefore, if the loosening washer 48 can be visually confirmed, it can be seen that the kick clamp bolt 40 is not tightened, so that the upper cover 13 and the lower cover 12 are not assembled. On the contrary, if the loosening washer 48 cannot be visually confirmed, it can be seen that the kick clamp bolt 40 has been tightened, indicating that the upper cover 13 and the lower cover 12 are assembled. .
In addition, by painting red or yellow on the loosening washer 48 so that the loosening identification washer 48 can be easily seen by the naked eye, the loosening washer 48 is provided inside and outside the screw hole 45. By facilitating the distinction of whether the upper cover 13 and the lower cover 12 may be easy to see whether it is assembled.

That is, the bolt spring 42 is configured to be smaller than the outer diameter of the bolt screw 43 and the bolt head 41 while the inner diameter of the edge is slightly larger than the outer diameter of the lower bolt body (44).

When disassembling the upper cover 13, if the bolt clamp 43 is separated from the female screw of the bolt fastening hole 46 by rotating the kick clamp bolt 40, the kick clamp bolt 40 by the bolt spring 42 Naturally, the disassembler knows that the kick clamp bolt 40 is completely called and no longer rotates the kick clamp bolt 40, thereby preventing the screw thread of the bolt fastening portion 39 from being damaged.

In addition, the explosion-proof valve opening and closing device of the screw-type tightening structure is that the two assembly bolts of the assembly bolts are used to prevent people from opening without special tools because of explosion-proof regulations, the kick clamp bolt 40 is an explosion-proof locking bolt as the upper cover ( 13) by fixing a separate tab in the upper cover 13, the kick clamp bolt 40 is not separated from the upper cover 13, so that the decomposer will not lose the kick clamp bolt (40).

That is, as shown in FIG. 7, the compressed bolt spring 42 is compressed when the bolt spring 42 compressed when the upper cover 13 is disassembled is separated from the female screw of the bolt fastening hole 46. While stretching, the compressive force acts as the stretching force, so that the bolt spring 42 springs up.

The bolt spring 42 has a janggo-type compressed coil spring, that is, the outer diameter is larger toward the center, that is, the appearance is like a main plate egg like the bolt spring 42 of FIG.

The loosening washer 48 has a role of slipping so that the kick clamp bolt 40 is not tightened while the kick clamp bolt 40 is tightened and the kick clamp bolt 40 is loosened, and the loosening washer 48 is screwed ( Protruding by the force of the bolt spring 42 out of 45) the disassembler checks the loosening of the kick clamp bolt 40 to protect the bolt spring 42 while making it easy to remove the upper cover (13).

The vault-type bolt spring 42 is formed with a smaller outer diameter toward the edge than the outer diameter of the center, so that when the bolt spring 42 is compressed when the upper cover 13 is assembled, a spring line having a small outer diameter has a large outer diameter. Insertion into the inner diameter of the line has the effect of reducing the overall length of the kick clamp bolt 40.

In addition, the high-mounted bolt spring 42 serves to raise the kick clamp bolt 40 up and tightened to the bottom portion so that the deformation of the bolt spring 42 is not.

 Since the overall length of the kick clamp bolt 40 is reduced, the length of the bolt coupling parts 38 and 39 can be reduced, thereby making the overall structure of the housing 5 compact.

On the other hand, a cylindrical stopper 47 is formed at the lower end of the bolt fastening hole 46 of the bolt fastening part 39 in the lower body 12 so that the kick clamp bolt 40 is assembled when the upper cover 13 is assembled. Do not rotate any more.
When assembling the upper cover 13 and the lower cover 12, the male screw of the kick clamp bolt 40 is inserted into the screw hole 45 of the upper cover 13, the bolt fastening hole of the lower cover 12 Advance by screwing with female thread of (46).
When the kick clamp bolt 40 is advanced, the bottom surface of the kick clamp bolt 40 comes into contact with the top surface of the stopper 47 formed at the lower end of the bolt fastening hole 46, and thus the kick clamp is driven by the stopper 47. The bolt 40 can no longer be tightened.

As shown in Figure 6, when assembling the upper cover 13 to rotate the kick clamp bolt 40, the kick clamp bolt 40 is no longer rotated by the stopper 40, the assembler is the kick clamp bolt 40 It can be seen that the) is completely tightened to prevent the damage of the thread of the bolt fastening portion 39 by no longer forcibly rotating the kick clamp bolt (40).

In other words, even when the kick clamp bolt 40 is turned to a large force to the end, a constant gap is maintained so that the top spring is not deformed or damaged by the bolt head 41.

As described above, the present invention has the advantage that the valve opening and closing indicator can be installed on the upper cover by configuring a dual stem of the guide stem and the holder stem between the cam shaft and the cam shaft hole of the upper cover in the screw-type valve opening and closing device have.

In addition, the present invention has the advantage that the on-off valve indicator, the upper cover and the lower body is shipped as an assembly, the user can complete the screw assembly valve opening and closing device by assembling the upper cover and the lower body in the field.

 In addition, the present invention has the advantage that the point can be matched to the opening or closing of the valve opening and closing display panel when assembling the upper cover in the screw-type valve opening and closing device.

 In addition, the present invention has the advantage that the explosion-proof performance by the guide stem and the holder stem is added to improve the explosion-proof performance.

In addition, the present invention has the advantage that by assembling the upper cover and the lower body with the kick clamp bolt, the kick clamp bolt is spontaneously raised by the force of the bolt spring when the upper cover is disassembled to prevent damage to the bolt fastening portion.

In addition, the present invention has the advantage of reducing the overall length of the kick clamp bolt by using the high-mounted bolt spring.

In addition, the present invention has the advantage of protecting the bolt spring by easily identifying that the disassembly of the upper cover to loosen the kick clamp bolt can be used to identify the loosening washer.

Claims (7)

 A housing formed by assembling the upper cover and the lower body with screws and assembly bolts, a cam shaft penetrating downwards inside the housing, an operation cam fixed to the cam shaft and interlocked with the cam shaft, and on / off operated by the operation cam In the screw-type valve opening and closing device comprising a switch terminal and a controller for controlling the valve opening and closing according to the operation of the on / off switch terminal, A valve opening / closing indicator having a valve opening / closing display plate rotatably inserted in an upper portion of the upper cover; A cam shaft hole formed on an upper surface of the upper cover; A guide stem inserted into the inner diameter of the cam shaft hole and having a hollow inner diameter; And a holder stem inserted into the inner diameter of the guide stem and having a hollow inner diameter. The cam shaft is inserted into the inner diameter of the holder stem and the valve opening and closing plate is rotated by the rotation of the cam shaft.       (delete) The method of claim 1, The holder stem is a U-shaped groove ring groove is formed in the outer ring circumferential shape of the outer diameter; is composed of a screw-assembled valve opening and closing device characterized in that the explosion-proof surface is configured with the holder stem and the guide stem by the o-ring. The method of claim 1, The cam shaft hole is a projection formed on the circumferential surface of the inner diameter; The guide stem is a groove formed on the circumferential surface of the outer diameter; screw assembly valve opening and closing device, characterized in that the guide stem is assembled to the cam shaft hole by the groove of the guide stem is fixed to the projection of the cam shaft hole. The method of claim 1, The assembly bolt is composed of a lower bolt body extending to the bolt head and the end of the lower bolt bolt body is composed of a bolt spring of the compression coil extrapolated between the bolt head and the bolt screw; when disassembling the upper cover Screw assembly valve opening and closing device characterized in that the assembly bolt is raised by the bolt spring when the assembly bolt is sufficiently rotated. The method of claim 5, The bolt spring is screw-mounted valve opening and closing device, characterized in that the outer diameter is a janggo-type compression coil springs toward the center. The method of claim 5, The screw fastening end of the lower body bolt fastening portion is a stopper is configured screw stopper valve opening and closing device characterized in that the bolt screw is no longer rotated.

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