阅读说明：本技术 一种液化天然气装置用具有方便检修结构的低温阀 (Low-temperature valve with convenient maintenance structure for liquefied natural gas device ) 是由 李红 于 2021-01-04 设计创作，主要内容包括：本发明公开了一种液化天然气装置用具有方便检修结构的低温阀,包括连接端口主体、第一法兰盘主体、第二法兰盘主体和阀杆外壳主体,所述连接端口主体顶端固定连接有第一法兰盘主体,且第一法兰盘主体顶端贴合有第二法兰盘主体,所述第二法兰盘主体内部插设有阀杆外壳主体,所述第一法兰盘主体内部设置有检修机构,且检修机构包括第一腔室,所述第一法兰盘主体内部开设有第一腔室。本发明解决了低温阀不便进行检修的问题,通过检修机构和移动机构之间相互配合,改变了第一法兰盘主体和第二法兰盘主体之间的对接方式,且工作人员通过一定的操作便可对该装置整体内部进行检修,令工作人员检修的操作步骤更为简洁。(The invention discloses a low-temperature valve with a convenient maintenance structure for a liquefied natural gas device, which comprises a connecting port main body, a first flange main body, a second flange main body and a valve rod shell main body, wherein the first flange main body is fixedly connected to the top end of the connecting port main body, the second flange main body is attached to the top end of the first flange main body, the valve rod shell main body is inserted into the second flange main body, a maintenance mechanism is arranged in the first flange main body, the maintenance mechanism comprises a first cavity, and the first cavity is arranged in the first flange main body. The invention solves the problem that the low-temperature valve is inconvenient to overhaul, changes the butt joint mode between the first flange main body and the second flange main body by the mutual matching of the overhauling mechanism and the moving mechanism, and enables a worker to overhaul the whole inner part of the device through certain operation, thereby leading the operation steps of overhauling of the worker to be more concise.)

1. The utility model provides a liquefied natural gas device is with having convenient cryogenic valve who overhauls structure, includes connection port main part (111), first ring flange main part (112), second ring flange main part (113) and valve rod shell main part (114), connection port main part (111) top fixedly connected with first ring flange main part (112), and first ring flange main part (112) top laminating has second ring flange main part (113), second ring flange main part (113) inside is inserted and is equipped with valve rod shell main part (114), its characterized in that: the maintenance mechanism is arranged inside the first flange main body (112) and comprises a first cavity (211), the first cavity (211) is formed inside the first flange main body (112), the inner wall of the first cavity (211) is movably connected with a first arc-shaped plate (212) through a rotating shaft, the right side of the first arc-shaped plate (212) is hinged with a second arc-shaped plate (213), a sealing gasket (214) is glued on the inner wall of the first arc-shaped plate (212), the outer wall of the first flange main body (112) is fixedly connected with a first supporting plate (215), the top end of the first supporting plate (215) is fixedly connected with a side plate (216), a screw rod (217) is movably connected inside the side plate (216) through a bearing, the left side of the screw rod (217) is inserted inside the first flange main body (112), a threaded sleeve (218) is sleeved on the outer wall of the screw rod (217), and a first hinge rod (220) is movably connected on the outer wall, one end, far away from the outer wall of the threaded sleeve (218), of the first hinge rod (220) is movably connected to the outer wall of the first arc-shaped plate (212) through a rotating shaft, a side rod (223) is fixedly connected to the right side of the screw rod (217), a fixed handle (224) is fixedly connected to the right side of the side rod (223), and a rubber sleeve (225) is glued to the outer wall of the fixed handle (224).

2. The cryogenic valve for a liquefied natural gas apparatus according to claim 1, wherein the cryogenic valve has a structure facilitating maintenance, and wherein: the outer wall of the second flange plate main body (113) is provided with a moving mechanism, the moving mechanism comprises a fixed rod (311), the outer wall of the side plate (216) is fixedly connected with the fixed rod (311), the outer wall of the screw rod (217) penetrates through a first belt pulley (312), the inner wall of the first belt pulley (312) is fixedly connected with the outer wall of the screw rod (217), the outer wall of the fixed rod (311) penetrates through a second belt pulley (313), the inner wall of the second belt pulley (313) is fixedly connected with the outer wall of the fixed rod (311), the outer wall of the second belt pulley (313) is wound with a conveying belt (314), a first sliding groove (315) is formed in the side plate (216), a first sliding block (316) is connected in the first sliding groove (315) in a sliding manner, and a second supporting plate (318) is fixedly connected to the left side of the first sliding block (316), and second backup pad (318) left side fixedly connected with second connecting plate (319), second connecting plate (319) left side fixed connection is in second ring flange main part (113) outer wall, and second connecting plate (319) right side fixedly connected with rack plate (320), rack plate (320) bottom fixed connection is in second backup pad (318) outer wall, and rack plate (320) openly meshes there is gear (321), gear (321) inside runs through has dead lever (311), and dead lever (311) outer wall fixed connection is in gear (321) inner wall.

3. The cryogenic valve for a liquefied natural gas apparatus according to claim 1, wherein the cryogenic valve has a structure facilitating maintenance, and wherein: the top end of the second flange main body (113) is provided with an auxiliary supporting mechanism, the auxiliary supporting mechanism comprises a fixing rod (311), the top end of the second flange main body (113) is fixedly connected with a first supporting column (411), a second cavity (412) is formed inside the first supporting column (411), the inner wall of the second cavity (412) is fixedly connected with a first spring (413), one end, far away from the inner wall of the second cavity (412), of the first spring (413) is fixedly connected with a second supporting column (414), the top end of the second supporting column (414) is movably connected with a second hinge rod (418) through a rotating shaft, one side, far away from the top end of the second supporting column (414), of the second hinge rod (418) is movably connected with a supporting sleeve (419) through the rotating shaft, a valve rod shell main body (114) penetrates through the inside of the supporting sleeve (419), and a rubber pad (420) is glued on the inner wall, third spout (421) have been seted up to valve rod shell main part (114) inside, and third spout (421) inside sliding connection has third slider (422), third slider (422) top fixedly connected with second spring (423), and second spring (423) keep away from the one end fixed connection on third slider (422) top in third spout (421) inner wall, third slider (422) outer wall fixedly connected with plate (424), and plate (424) bottom fixed connection in support cover (419) outer wall.

4. The cryogenic valve for a liquefied natural gas apparatus according to claim 1, wherein the cryogenic valve has a structure facilitating maintenance, and wherein: the outer wall of the screw rod (217) is glued with a first connecting plate (219), and the right side of the first connecting plate (219) is attached to the outer wall of the threaded sleeve (218).

5. The cryogenic valve for a liquefied natural gas apparatus according to claim 1, wherein the cryogenic valve has a structure facilitating maintenance, and wherein: a groove (221) is formed in the side plate (216), a ball (222) is movably connected to the inner wall of the groove (221) through a rotating shaft, and the bottom end of the ball (222) is attached to the outer wall of the screw (217).

6. The cryogenic valve for a liquefied natural gas apparatus according to claim 2, wherein the cryogenic valve has a structure facilitating maintenance, and wherein: the inner wall of the first sliding groove (315) is fixedly connected with a first fixing block (317), and the top end of the first fixing block (317) is attached to the outer wall of the first sliding block (316).

7. The cryogenic valve for a liquefied natural gas apparatus according to claim 2, wherein the cryogenic valve has a structure facilitating maintenance, and wherein: the front surface of the rack plate (320) is glued with a connecting block (322), and the connecting block (322) is made of rubber.

8. The cryogenic valve for a liquefied natural gas apparatus according to claim 3, wherein the cryogenic valve has a structure facilitating maintenance, and wherein: second spout (415) have been seted up to second cavity (412) inside, and second spout (415) inside sliding connection has second slider (416), second slider (416) right side fixed connection in second support column (414) outer wall, and second slider (416) top laminating has second fixed block (417), second fixed block (417) top fixed connection in second spout (415) inner wall.

Technical Field

The invention relates to the technical field of low-temperature valves, in particular to a low-temperature valve with a convenient maintenance structure for a liquefied natural gas device.

Background

The low-temperature valve comprises a low-temperature ball valve, a low-temperature gate valve, a low-temperature stop valve, a low-temperature safety valve, a low-temperature check valve, a low-temperature butterfly valve, a low-temperature needle valve, a low-temperature throttle valve, a low-temperature pressure reducing valve and the like, is mainly used for ethylene and liquefied natural gas devices, natural gas LPGLNG storage tanks, receiving bases and satellite stations, air separation equipment, petrochemical tail gas separation equipment, liquid oxygen, liquid nitrogen, liquid argon and carbon dioxide low-temperature storage tanks and tank cars, pressure swing adsorption oxygen production devices and other devices, and the output liquid low-temperature media such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, and needs to be gasified when the temperature is raised, the volume is expanded by hundreds of times when the gasification is carried out, the application of a low-temperature valve controls the temperature, prevents hidden troubles such as explosion, leakage and the like, it can be seen that the cryogenic valve for a lng plant of the present invention substantially meets the needs of people, but still has some problems.

Most of the low temperature valves that present liquefied natural gas device used are integral type structural design, when wearing and tearing fracture or valve rod bending appear in the inside valve-stem nut of low temperature valve, because the inconvenient staff of butt joint mode between the ring flange opens, further limited the staff to the inside maintenance condition of low temperature valve, lead to the staff can not in time carry out the solution of pertinence to the problem that appears, thereby reduced the holistic practicality and the ease of use of the device, therefore need for a liquefied natural gas device with the low temperature valve that has convenient maintenance structure to solve above-mentioned problem urgently.

Disclosure of Invention

The invention aims to provide a low-temperature valve with a convenient maintenance structure for a liquefied natural gas device, which aims to solve the problem that the butt joint mode between flanges in the background technology is inconvenient for a worker to open, so that the worker cannot timely and pertinently solve the problems.

In order to achieve the purpose, the invention provides the following technical scheme: a low-temperature valve with a convenient maintenance structure for a liquefied natural gas device comprises a connecting port main body, a first flange main body, a second flange main body and a valve rod shell main body, wherein the top end of the connecting port main body is fixedly connected with the first flange main body, the top end of the first flange main body is attached with the second flange main body, the valve rod shell main body is inserted in the second flange main body, a maintenance mechanism is arranged in the first flange main body and comprises a first cavity, the first cavity is arranged in the first flange main body, the inner wall of the first cavity is movably connected with a first arc-shaped plate through a rotating shaft, the right side of the first arc-shaped plate is hinged with a second arc-shaped plate, a sealing gasket is glued on the inner wall of the first arc-shaped plate, the outer wall of the first flange main body is fixedly connected with a first supporting plate, and the top end of the, the side plate is internally and movably connected with a screw rod through a bearing, the left side of the screw rod is inserted into the first flange plate main body, the outer wall of the screw rod is sleeved with a threaded sleeve, the outer wall of the threaded sleeve is movably connected with a first hinge rod through a rotating shaft, one end, far away from the outer wall of the threaded sleeve, of the first hinge rod is movably connected with the outer wall of the first arc plate through the rotating shaft, a side rod is fixedly connected to the right side of the screw rod, a fixed handle is fixedly connected to the right side of the side rod, and a rubber.

Preferably, the outer wall of the second flange main body is provided with a moving mechanism, the moving mechanism comprises a fixed rod, the outer wall of the side plate is fixedly connected with the fixed rod, the outer wall of the screw rod penetrates through a first belt pulley, the inner wall of the first belt pulley is fixedly connected with the outer wall of the screw rod, the outer wall of the fixed rod penetrates through a second belt pulley, the inner wall of the second belt pulley is fixedly connected with the outer wall of the fixed rod, the outer wall of the second belt pulley is wound with a conveyor belt, the inner part of the side plate is provided with a first chute, the inner part of the first chute is connected with a first slide block in a sliding manner, the left side of the first slide block is fixedly connected with a second support plate, the left side of the second support plate is fixedly connected with a second connecting plate, the left side of the second connecting plate is fixedly connected, the rack plate is fixedly connected to the outer wall of the second supporting plate at the bottom end, the gear is meshed with the front face of the rack plate, a fixing rod penetrates through the inside of the gear, and the outer wall of the fixing rod is fixedly connected to the inner wall of the gear.

Preferably, the top end of the second flange main body is provided with an auxiliary supporting mechanism, the auxiliary supporting mechanism comprises a fixed rod, the top end of the second flange main body is fixedly connected with a first supporting column, a second cavity is formed in the first supporting column, the inner wall of the second cavity is fixedly connected with a first spring, one end of the first spring, far away from the inner wall of the second cavity, is fixedly connected with a second supporting column, the top end of the second supporting column is movably connected with a second hinge rod through a rotating shaft, one side, far away from the top end of the second supporting column, of the second hinge rod is movably connected with a supporting sleeve through a rotating shaft, a valve rod shell main body penetrates through the supporting sleeve, a rubber pad is glued on the inner wall of the supporting sleeve, a third sliding groove is formed in the valve rod shell main body, a third sliding block is slidably connected in the third sliding groove, and the top end of, and the one end fixed connection that the third slider top was kept away from to the second spring is in third spout inner wall, third slider outer wall fixedly connected with plate, and plate bottom fixed connection supports the cover outer wall in.

Preferably, the outer wall of the screw rod is glued with a first connecting plate, and the right side of the first connecting plate is attached to the outer wall of the threaded sleeve.

Preferably, the side plates are provided with grooves, the inner walls of the grooves are movably connected with balls through rotating shafts, and the bottom ends of the balls are attached to the outer wall of the screw rod.

Preferably, the inner wall of the first sliding groove is fixedly connected with a first fixed block, and the top end of the first fixed block is attached to the outer wall of the first sliding block.

Preferably, the front face of the rack plate is glued with a connecting block, and the connecting block is made of rubber.

Preferably, a second sliding groove is formed in the second chamber, a second sliding block is connected to the inside of the second sliding groove in a sliding mode, the right side of the second sliding block is fixedly connected to the outer wall of the second supporting column, a second fixing block is attached to the top end of the second sliding block, and the top end of the second fixing block is fixedly connected to the inner wall of the second sliding groove.

Compared with the prior art, the invention has the beneficial effects that: the liquefied natural gas device is provided with a first cavity, a first arc plate, a second arc plate, a sealing gasket, a first supporting plate, a side plate, a screw rod, a screw sleeve, a first connecting plate, a first hinge rod, a groove, a ball, a side lever, a fixed handle and a rubber sleeve, wherein the rubber sleeve is rotated firstly, the screw rod is driven to rotate inside the side plate through the fixed handle, the screw sleeve on the outer wall of the screw rod is moved, the first hinge rod is driven to rotate by taking a rotating shaft of the outer wall of the screw sleeve as a center while the screw sleeve moves, the first hinge rod drives the first arc plate to rotate inside the first cavity, the problem that the low-temperature valve is inconvenient to overhaul is solved, and a worker can overhaul a valve nut inside the low-temperature valve conveniently through the mechanism;

the low-temperature valve maintenance device is also provided with a fixed rod, a first belt pulley, a second belt pulley, a conveyor belt, a first chute, a first slide block, a first fixed block, a second support plate, a second connecting plate, a rack plate, a gear and a connecting block, wherein the screw rotates and drives the first belt pulley to rotate, the first belt pulley rotates and drives the conveyor belt to rotate, the conveyor belt synchronously drives the second belt pulley to rotate, the second belt pulley simultaneously drives the fixed rod to rotate, the fixed rod rotates and drives the gear to rotate, the gear drives the rack plate to move, the rack plate moves and drives the second connecting plate and the second support plate to move, the second connecting plate drives the second flange main body to move, the second support plate drives the first slide block to move in the first chute, the problem that the low-temperature valve is inconvenient to maintain is solved, and the maintenance mechanism and the moving mechanism are matched with each other, the butt joint mode between the first flange main body and the second flange main body is changed, and a worker can overhaul the whole interior of the device through certain operation, so that the operation steps of overhauling the worker are simpler;

in addition, still be provided with first support column, the second cavity, first spring, the second support column, the second spout, the second slider, the second fixed block, the second hinge rod, support the cover, the rubber pad, the third spout, the third slider, second spring and plate, produce the promotion to first support column when second ring flange main part removes, first support column drives inside second support column and removes, drive the second hinge rod and remove when the second support column removes, the effect that the second hinge rod produced the promotion to supporting the cover, it removes to support the cover drive plate, it removes to drive the third slider inside the third spout when the plate removes, the inconvenient problem of overhauing of low-temperature valve has been solved, make the staff when overhauing, protect the valve rod, avoid appearing the phenomenon of buckling.

Drawings

FIG. 1 is a schematic front sectional view of the present invention;

FIG. 2 is a schematic top cross-sectional view of the present invention;

FIG. 3 is a schematic view in elevation, partially in section, of the maintenance mechanism and the movement mechanism of the present invention;

FIG. 4 is a schematic front view, partially in section, of an auxiliary support mechanism according to the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 2 according to the present invention;

FIG. 6 is an enlarged view of the structure at B in FIG. 2 according to the present invention;

FIG. 7 is an enlarged view of the structure at C in FIG. 3 according to the present invention;

FIG. 8 is an enlarged view of the structure of FIG. 3 according to the present invention;

FIG. 9 is an enlarged view of the structure at E in FIG. 3 according to the present invention;

FIG. 10 is an enlarged view of the structure at F in FIG. 3 according to the present invention;

FIG. 11 is an enlarged view of the structure at G of FIG. 4 according to the present invention;

fig. 12 is an enlarged view of the structure at H in fig. 4 according to the present invention.

In the figure: 111. a connection port body; 112. a first flange main body; 113. a second flange main body; 114. a valve stem housing body; 211. a first chamber; 212. a first arc-shaped plate; 213. a second arc-shaped plate; 214. a gasket; 215. a first support plate; 216. a side plate; 217. a screw; 218. a threaded sleeve; 219. a first connecting plate; 220. a first hinge lever; 221. a groove; 222. a ball bearing; 223. a side lever; 224. fixing a handle; 225. a rubber sleeve; 311. fixing the rod; 312. a first pulley; 313. a second pulley; 314. a conveyor belt; 315. a first chute; 316. a first slider; 317. a first fixed block; 318. a second support plate; 319. a second connecting plate; 320. a rack plate; 321. a gear; 322. connecting blocks; 411. a first support column; 412. a second chamber; 413. a first spring; 414. a second support column; 415. a second chute; 416. a second slider; 417. a second fixed block; 418. a second hinge lever; 419. a support sleeve; 420. a rubber pad; 421. a third chute; 422. a third slider; 423. a second spring; 424. and (4) a plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-12, an embodiment of the present invention is shown: a low-temperature valve with a convenient maintenance structure for a liquefied natural gas device comprises a connecting port main body 111, a first flange main body 112, a second flange main body 113 and a valve rod shell main body 114, wherein the top end of the connecting port main body 111 is fixedly connected with the first flange main body 112, the top end of the first flange main body 112 is attached with the second flange main body 113, the valve rod shell main body 114 is inserted in the second flange main body 113, a maintenance mechanism is arranged in the first flange main body 112 and comprises a first cavity 211, the first cavity 211 is arranged in the first flange main body 112, the inner wall of the first cavity 211 is movably connected with a first arc-shaped plate 212 through a rotating shaft, the right side of the first arc-shaped plate 212 is hinged with a second arc-shaped plate 213, a sealing gasket 214 is glued on the inner wall of the first arc-shaped plate 212, the outer wall of the first flange main body 112 is, and first backup pad 215 top fixedly connected with curb plate 216, curb plate 216 is inside to have screw rod 217 through bearing swing joint, and inside screw rod 217 left side was inserted and is located first ring flange main part 112, screw rod 217 outer wall cover is equipped with swivel nut 218, and the outer wall of swivel nut 218 has first articulated mast 220 through pivot swing joint, the one end that the outer wall of swivel nut 218 was kept away from to first articulated mast 220 is through pivot swing joint in first arc 212 outer wall, screw rod 217 right side fixedly connected with side lever 223, and side lever 223 right side fixedly connected with fixed handle 224, the outer wall glue of fixed handle 224 has rubber sleeve 225.

The outer wall of the second flange main body 113 is provided with a moving mechanism, and the moving mechanism comprises a fixed rod 311, the outer wall of the side plate 216 is fixedly connected with the fixed rod 311, the outer wall of the screw 217 penetrates through a first belt pulley 312, the inner wall of the first belt pulley 312 is fixedly connected with the outer wall of the screw 217, the outer wall of the fixed rod 311 penetrates through a second belt pulley 313, the inner wall of the second belt pulley 313 is fixedly connected with the outer wall of the fixed rod 311, the outer wall of the second belt pulley 313 is wound with a conveyor belt 314, the outer wall of the first belt pulley 312 is wound with the conveyor belt 314, the inner part of the side plate 216 is provided with a first chute 315, the inner part of the first chute 315 is slidably connected with a first slide block 316, the left side of the first slide block 316 is fixedly connected with a second support plate 318, the left side of the second support plate 318 is fixedly connected with, the bottom end of the rack plate 320 is fixedly connected to the outer wall of the second supporting plate 318, the gear 321 is engaged with the front surface of the rack plate 320, the fixing rod 311 penetrates through the inside of the gear 321, and the outer wall of the fixing rod 311 is fixedly connected to the inner wall of the gear 321.

An auxiliary supporting mechanism is arranged at the top end of the second flange main body 113, and the auxiliary supporting mechanism comprises a fixing rod 311, a first supporting column 411 is fixedly connected to the top end of the second flange main body 113, a second chamber 412 is arranged in the first supporting column 411, a first spring 413 is fixedly connected to the inner wall of the second chamber 412, a second supporting column 414 is fixedly connected to one end of the first spring 413 far away from the inner wall of the second chamber 412, a second hinge rod 418 is movably connected to the top end of the second supporting column 414 through a rotating shaft, a supporting sleeve 419 is movably connected to one side of the second hinge rod 418 far away from the top end of the second supporting column 414 through a rotating shaft, a valve rod housing main body 114 penetrates through the supporting sleeve 419, a rubber pad 420 is glued to the inner wall of the supporting sleeve 419, a third sliding groove 421 is arranged in the valve rod housing main body 114, a third sliding block 422 is slidably connected to the inside of the third sliding, and one end of the second spring 423, which is far away from the top end of the third sliding block 422, is fixedly connected to the inner wall of the third sliding groove 421, the outer wall of the third sliding block 422 is fixedly connected with a plate 424, and the bottom end of the plate 424 is fixedly connected to the outer wall of the supporting sleeve 419.

The outer wall of the screw 217 is glued with a first connecting plate 219, and the right side of the first connecting plate 219 is attached to the outer wall of the threaded sleeve 218, so that the threaded sleeve 218 is prevented from wearing the outer wall of the first flange plate main body 112.

The side plate 216 is internally provided with a groove 221, the inner wall of the groove 221 is movably connected with a ball 222 through a rotating shaft, and the bottom end of the ball 222 is attached to the outer wall of the screw 217, so that the screw 217 can rotate more conveniently.

The inner wall of the first sliding groove 315 is fixedly connected with a first fixing block 317, and the top end of the first fixing block 317 is attached to the outer wall of the first sliding block 316.

The connecting block 322 is glued to the front surface of the rack plate 320, and the connecting block 322 is made of rubber, so that the moving range of the gear 321 is limited, and the abrasion of the gear 321 to the outer wall of the second supporting plate 318 is avoided.

Second runner 415 is seted up to inside the second chamber 412, and the inside sliding connection of second runner 415 has second slider 416, and second slider 416 right side fixed connection is in second support column 414 outer wall, and the laminating of second slider 416 top has second fixed block 417, and second fixed block 417 top fixed connection is in second runner 415 inner wall, makes the inside better removal that can of second chamber 412 of second support column 414, and reduces the wearing and tearing of second slider 416 to second runner 415 inner wall.

The working principle is as follows: the rubber sleeve 225 is rotated first, the screw 217 is driven to rotate inside the side plate 216 through the fixed handle 224, the screw 217 drives the ball 222 to rotate inside the groove 221 when rotating, the threaded sleeve 218 on the outer wall of the screw 217 moves, the threaded sleeve 218 drives the first hinge rod 220 to rotate by taking a rotating shaft on the outer wall of the threaded sleeve 218 as a center when moving, and the first hinge rod 220 drives the first arc-shaped plate 212 to rotate inside the first cavity 211.

The screw 217 rotates and drives the first belt pulley 312 to rotate, the first belt pulley 312 rotates and drives the transmission belt 314 to rotate, the transmission belt 314 synchronously drives the second belt pulley 313 to rotate, the second belt pulley 313 simultaneously drives the fixing rod 311 to rotate, the fixing rod 311 rotates and drives the gear 321 to rotate, the gear 321 drives the rack plate 320 to move, the rack plate 320 moves and drives the second connecting plate 319 and the second supporting plate 318 to move, the second connecting plate 319 drives the second flange main body 113 to move, and the second supporting plate 318 drives the first sliding block 316 to move inside the first sliding groove 315.

When the second flange main body 113 moves, the first support column 411 is pushed, the first support column 411 drives the second support column 414 inside to move, the second support column 414 moves while driving the second sliding block 416 to move inside the second sliding groove 415, the second support column 414 synchronously drives the second hinge rod 418 to move, the second hinge rod 418 pushes the support sleeve 419, the support sleeve 419 drives the plate 424 to move, the plate 424 moves while driving the third sliding block 422 to move inside the third sliding groove 421, the third sliding block 422 extrudes the second spring 423 when moving inside the third sliding groove 421, and the second spring 423 is elastically deformed.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.