CN218671051U

CN218671051U - Quick assembly disassembly's scalable wear-resisting nipple

Info

Publication number: CN218671051U
Application number: CN202223196173.4U
Authority: CN
Inventors: 吴浩钧; 许保峰; 殷会海; 于士峰; 李博; 沈杨; 张军; 杨成益; 孟劲松; 信曼娜
Original assignee: Anhui Masteel Mining Resources Group Nanshan Mining Co Ltd
Current assignee: Anhui Masteel Mining Resources Group Nanshan Mining Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-03-21
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a technical field who relates to mine site pipeline links up equipment specifically is a scalable wear-resisting nipple that can be adapted to narrow and small space department between dustproof pump station and the underflow pump house and can quick assembly disassembly, can wash, prevent blockking up, has adopted following technical scheme: the water pipe assembly comprises a first bearing disk short pipe, a second bearing disk short pipe and a telescopic sealing structure arranged between the first bearing disk short pipe and the second bearing disk short pipe, wherein two ends of the telescopic sealing structure are arranged at corresponding ends of the first bearing disk short pipe and the second bearing disk short pipe through connecting components, and a water pipe is externally connected to the first bearing disk short pipe. The maintenance efficiency can be effectively improved, the maintenance operation difficulty is reduced, the service life of the equipment is prolonged, and the pressure bearing capacity of the pipeline is improved.

Description

Quick assembly disassembly's scalable wear-resisting nipple

Technical Field

The utility model relates to a technical field of mine site pipeline links up equipment specifically is one kind and can be adapted to narrow and small space department between dustproof pump station and the underflow pump house and can quick assembly disassembly, can wash, prevent scalable wear-resisting nipple of jam.

Background

The daily tailing conveying amount of a slag slurry pump in a dustproof pump station and an underflow pump room of a super fine crushing section of a concentrating mill reaches more than ten thousand tons, along with the increase of ore treatment capacity year by year, the equipment selection is gradually increased, the space in an underground pump room is small, the difficulty in mounting and dismounting a pipeline is very high, and the pipeline is easy to block at the position when being started and stopped. When equipment is overhauled, the pipeline can be detached after a slurry pump and a motor are moved, the overhauling progress is seriously affected, the expansion joint on the market cannot simultaneously meet the requirements of cleaning internal residues and installing the pipeline in a narrow space, and the overhauling operation which can be completed within one hour originally is often completed within 2-3 hours. The staff overhauls the degree of difficulty very big, for improving maintenance efficiency, reduces the maintenance operation degree of difficulty, and improve equipment's life improves the pipeline bearing capacity, and it needs to improve to find urgent.

Disclosure of Invention

The utility model aims at solving the prior art in not enough, so provide one kind and be adapted to narrow and small space department between dustproof pump station and the underflow pump house and can quick assembly disassembly, can wash, prevent the scalable wear-resisting nipple pipe of jam, improve maintenance efficiency, reduce the maintenance operation degree of difficulty, improve equipment's life improves the pipeline bearing capacity.

In order to realize the purpose, the telescopic wear-resistant nipple which can be quickly disassembled and assembled adopts the following technical scheme: the improved water pump comprises a first bearing disc short pipe, a second bearing disc short pipe and a telescopic sealing structure arranged between the first bearing disc short pipe and the second bearing disc short pipe, wherein two ends of the telescopic sealing structure are installed at corresponding ends of the first bearing disc short pipe and the second bearing disc short pipe through a connecting assembly, the first bearing disc short pipe is externally connected with a water pipe, and the water pipe is used for flushing internal blockage before pumping, so that the pressure-bearing capacity of a pipeline is improved, and blockage at the position is prevented.

On the basis of the above embodiment, the telescopic sealing structure comprises a flexible sealing element, and the connecting assembly comprises a pressing piece and a connecting piece, wherein the end part of the flexible sealing element is pressed and distributed at the corresponding ends of the first bearing disk short pipe and the second bearing disk short pipe, and the connecting piece is used for pressing the end part of the flexible sealing element and the corresponding ends of the first bearing disk short pipe and the second bearing disk short pipe.

On the basis of the above embodiment, the flexible sealing element is provided with a linking body, the pressing piece is provided with a linking convex body, and the linking body is hooped and arranged in a connecting groove of the linking convex body on the pressing piece.

On the basis of the above embodiment, the connecting piece includes a mounting groove arranged on one side of the pressing piece opposite to the flexible sealing piece and a connector inserted in the mounting groove, and a thrust structure is mounted in the mounting groove.

On the basis of the above embodiment, the thrust structure comprises a mounting hole and a limiting body, the mounting hole is formed in the side portion of the pressing piece and communicated with the mounting groove, a screw, a spring and a thrust body are mounted inside the mounting hole, the thrust body is partially exposed on the inner side of the mounting groove, a thrust area matched with the thrust body is arranged on the connecting body, and the limiting body is suitable for controlling the thrust body to move forwards and backwards.

On the basis of the above embodiment, the thrust body and the thrust region adapting part are arranged in a spherical structure, the thrust region comprises a transition part and a thrust part, the transition part and the thrust part are arranged in an arc structure, and the corresponding radius of the transition part is larger than that of the thrust part.

On the basis of the above embodiment, the stopper includes an elastic portion installed inside the mounting groove and a separation portion connected to the elastic portion and slidably disposed inside the mounting groove, and the separation portion is adapted to control the thrust spherical structure to advance and retreat.

In addition to the above embodiment, the connecting body includes a body provided with the thrust region and a through hole provided in a middle portion of the body, and an active structure adapted to switch the advance and retreat states of the separating portion is installed in the through hole.

On the basis of the embodiment, the initiative structure is including setting up in the shoulder hole at connector middle part, shoulder hole internally mounted has spring and the inside driving lever that has run through of spring, be provided with the cushion cap one with the butt of spring tip and be located the cushion cap two at cushion cap one top on the driving lever, spacing piece is installed to the lateral part of cushion cap one, spacing arch is installed to the free end of spacing piece, be provided with on the connector with the locating hole one and the locating hole two of spacing protruding adaptation, lay about locating hole one and locating hole two, install the fixing base on the connector in the locating hole two outsides, fixing base internally mounted has the locking round pin that just is used for relieving spacing arch and locating hole two locking states through spring coupling.

On the basis of the embodiment, the separating part is provided with a through hole, the corresponding end head of the driving rod is inserted into the mounting groove in a socket mode and is provided with a limiting part close to the end head, and the through hole is suitable for corresponding to the end head of the driving rod and blocking the limiting part.

Compared with the prior art, the utility model discloses possess following beneficial effect: the problem of cleaning the blocked pipe can be solved before the pump is started by externally connecting a water pipe on the bearing disc short pipe I.

The inventor starts from the perspective of considering both high repair efficiency and low cost: the first bearing disk short pipe and the second bearing disk short pipe are arranged in a thick-thin structure, the first bearing disk short pipe and the second bearing disk short pipe are thick-thin and are favorable for being connected with pipelines of a dustproof pump station and an underflow pump room, flanges are uniformly arranged at the end parts of the first bearing disk short pipe and the second bearing disk short pipe, the end parts of flexible sealing parts are pressed and fixedly installed through the flanges and pressing parts through bolts, and then the first bearing disk short pipe and the second bearing disk short pipe are quickly installed. Meanwhile, the bearing disc short pipe I and the bearing disc pipeline II are matched with a flexible sealing element for thickness setting, the bearing capacity of the pipeline is improved, and the service life of the equipment is prolonged.

The inventor starts from the angle of improving the maintenance efficiency to the maximum extent: the mode cost that the connecting piece adopted the bolt is the lowest mode of cost in the present scheme, but there is certain problem, exactly this application scheme needs to be applicable to the narrow and small space of pump house department, because the space limitation degree in this department is great, need to adopt spanner or the professional equipment that the bolt was screwed up during bolted connection, adopt the space limitation, can consume longer time, but this time still is obviously reduced than maintenance time in the past, so after this inventor considers this problem, imagine a scheme that can install this structure fast and need not to adopt professional equipment or spanner just can install flexible seal spare (basically not receive the restriction of operating space or operating space can be very little, as long as can satisfy the regional place of pipeline removal and all can operate):

when the end part of the flexible sealing element is installed with any one of the bearing disc short pipe I and the bearing disc short pipe II, the connecting body penetrates through a hole of an upper flange of the short pipe and enters into an installation groove of the pressing piece, the end part of a driving rod on the connecting body enters into a through hole in advance, the separating part can compress the elastic part to the bottom of the installation groove under the action of the limiting part along with the continuous entering of the connecting body, the thrust body is released and moves to the inside of the installation groove to a final position under the action of a spring in the installation hole, the thrust body moves towards the inside of the installation hole along the end structure under the action of the end part of the connecting body along with the continuous entering of the connecting body and compresses the spring at the position, when the end part of the thrust body enters into the transition area, the thrust body can exert pressure on the transition area under the action of the spring, so that the connecting body continues to enter into the installation groove to the thrust body until the thrust body enters into the thrust part to complete the locking state of the connecting body, and can press the flexible sealing element at the same time; when needs overhaul the change, only need through pressing the locking round pin, relieve locking state with spacing arch and locating hole two, spring on the driving lever can play the driving lever outward, and then make spacing arch and locating hole one realize locking state, the driving lever end can be retrieved to first position, the separation part can move to the outside under the effect of elastic part, and then go out the thrust part with the thrust body and break away from, and then make the connector obtain the release, remove it from the mounting groove is inside can accomplish the dismantlement work of flexible sealing member tip and short pipe flange, when installing newly again, only need with the inside promotion of driving lever to the connector, until spacing arch and locating hole two are in locking state, again with the connector with correspond the mounting groove connect can.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;

FIG. 2 is a sectional view of the structure employed in example 1;

FIG. 3 is a schematic view of the entire structure of embodiment 3;

FIG. 4 is a sectional view of the structure employed in example 2;

FIG. 5 is a partial enlarged view of the portion A in FIG. 4;

FIG. 6 is a schematic view of the connection between the compression member and the flexible seal at A in FIG. 4;

FIG. 7 is a working diagram of the connection member at A in FIG. 4 connected to the compression member;

FIG. 8 is a view of the connection member with the compression member at position A in FIG. 4;

fig. 9 is a partially enlarged view of the second positioning hole a in fig. 4.

In the figure: 10. a short bearing disc pipe I; 20. a bearing disc short pipe II; 30. a retractable sealing structure; 31. a flexible seal; 32. an adaptor body; 40. a connecting assembly; 41. a pressing member; 42. a connecting member; 421. mounting grooves; 422. a linker; 4221. a body; 4222. a through hole; 42222. a driving lever; 422221, limit part; 42223. a limiting sheet; 42224. a first positioning hole; 42225. a second positioning hole; 42226. a fixed seat; 42227. a limiting bulge; 42228. a locking pin; 423. mounting holes; 424. a screw; 426. a thrust body; 427. a thrust region; 4271. a transition section; 4272. a thrust part; 428. a limiting body; 4281. an elastic portion; 4282. a separation section; 43. engaging the protrusion.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Example 1: as shown in figures 1 and 2, the quick-to-dismount telescopic wear-resistant short connecting pipe comprises a first bearing disc short pipe 10, a second bearing disc short pipe 20 and a telescopic sealing structure 30 arranged between the first bearing disc short pipe and the second bearing disc short pipe, wherein a water pipe is externally connected to the first bearing disc short pipe 10, and the problem of pipe blockage cleaning can be solved before a pump is started through the externally connected water pipe to the first bearing disc short pipe 10.

The two ends of the telescopic sealing structure 30 are mounted at the corresponding ends of the first bearing disk short pipe 10 and the second bearing disk short pipe 20 through the connecting assembly 40, the telescopic sealing structure 30 comprises a flexible sealing element 31, the connecting assembly 40 comprises a pressing piece 41 for pressing and arranging the end part of the flexible sealing element 31 at the corresponding end of the first bearing disk short pipe 10 and the second bearing disk short pipe 20 and a connecting piece 42 for connecting the pressing piece 41 with the corresponding end of the first bearing disk short pipe 10 and the corresponding end of the second bearing disk short pipe 20, in the embodiment, the connecting piece 42 adopts a bolt mode to connect the pressing piece 41 with the corresponding end of the first bearing disk short pipe 10 and the corresponding end of the second bearing disk short pipe 20 and fix the flexible sealing element 31, the flexible sealing element 31 adopts nitrile rubber, and in the embodiment, the pressing piece 41 adopts a flange.

The flexible sealing element 31 is connected with any one of the first bearing disk short pipe 10 and the second bearing disk short pipe 20 in advance, then the first bearing disk short pipe 10 and the second bearing disk short pipe 20 are connected with corresponding pipelines through self flanges and bolts, and finally the first bearing disk short pipe 10, the second bearing disk short pipe 20 and the flexible sealing element 31 are installed, when the first bearing disk short pipe 10 and the second bearing disk short pipe 20 are connected with corresponding pipelines, the end parts can be as close as possible, so that a part of space can be released to complete installation processing of the end part of the flexible sealing element 31 and the other one of the first bearing disk short pipe 10 and the second bearing disk short pipe 20, further the pipeline is quickly disassembled and assembled, the overhauling work is improved, the overhauling work difficulty degree is reduced, and the traditional expansion joint repairing cannot be operated. Meanwhile, the first bearing disc short pipe 10 and the second bearing disc pipeline 20 are arranged in a thickness mode and matched with the flexible sealing element 31 for use, the pressure bearing capacity of the pipeline is improved, and the service life of the equipment is prolonged.

Example 2: as shown in fig. 4 to 9, a structure of the connecting member 42 different from the above embodiment is adopted, because if the connecting member 42 is a bolt, the cost is the lowest cost in the current scheme, but there is a certain problem that the scheme of the present application needs a narrow space suitable for a pump room, because the space limitation is large, a wrench or a special device for screwing a bolt is needed when the bolt is connected, and the space limitation consumes a long time, but the time is still significantly reduced compared with the conventional maintenance time, so the inventor considers the problem and imagines a scheme that the flexible sealing member 31 can be installed quickly without using a special device or a wrench when the structure is installed, specifically as follows:

the connecting member 42 includes an installation groove 421 disposed on one side of the pressing member 41 opposite to the flexible sealing member 31, and a connecting body 422 inserted into the installation groove 421, the pressing member 41 is preferably an annular disk in this embodiment, a thrust structure is installed inside the installation groove 421, the thrust structure includes an installation hole 423 disposed on a side of the pressing member 41 and communicated with the installation groove 421, a screw 424, a spring, and a thrust body 426 are installed inside the installation hole 423, the thrust body 426 is pressed inside the installation hole 423 through the screw 424 via the spring, and a portion of the thrust body 426 is exposed inside the installation groove 421, the connecting body 422 penetrates through a hole on an end flange of the short tube and is provided with a thrust area 427 adapted to the thrust body 426 thereon, the mating portions of the thrust body 426 and the thrust area 427 are arranged in a spherical structure, the thrust area 427 includes a transition portion 4271 and a thrust portion 4272, the transition portion 4271 and the thrust portion 4272 are both arranged in an arc structure, and a corresponding radius of the transition portion 4271 is greater than a corresponding radius of the thrust portion 4272. The spherical structure of the thrust body 426 presses the transition portion 4271 due to the action of the spring after the connection body 422 enters, so that the connection body 422 is further forced to enter until the thrust body 426 and the thrust portion 4272 are in a fitting state until the connection body 422 presses the flexible sealing member 31 between the pressing member 31 and the end flange of the short pipe, and only the connection body 422 needs to be axially pressed, which is basically not limited by the operation space.

The thrust structure further comprises a limiting body 428 which is suitable for controlling the pushing body 426 to advance and retreat, the limiting body 428 comprises an elastic part 4281 which is installed inside the installation groove 421 and a separating part 4282 which is connected with the elastic part 4281 and is arranged inside the installation groove 421 in a sliding mode, and the separating part 4282 is suitable for controlling the pushing body 426 to advance and retreat in a spherical structure. The separation portion 4282 axially moves relative to the mounting groove 421, and when the external force is released, the separation portion 4282 performs a restoring operation under the action of the elastic portion 4281, and the elastic portion 4281 may be a spring or a reed.

The connection body 422 includes a body 4221 provided with the thrust region 427 and a through hole 4222 arranged along the axis at the middle part of the body 4221, and a driving structure suitable for switching the advance and retreat states of the separation part 4282 is installed in the through hole 4222.

The active structure comprises a stepped hole arranged in the middle of the connecting body 422, a spring is arranged in the stepped hole, a driving rod 42222 penetrates through the spring, a first bearing platform abutted to the end of the spring and a second bearing platform positioned at the top of the first bearing platform are arranged on the driving rod 42222, a straight avoiding area is arranged on the lateral side of the first bearing platform, a limiting sheet 42223 (a sheet structure with certain rigidity and elastic deformation capacity) is arranged on the lateral side (the straight avoiding area), a limiting protrusion 42227 is arranged at the free end of the limiting sheet 42223, a first positioning hole 42224 and a second positioning hole 42225 which are matched with the limiting protrusion 42227 are arranged on the connecting body 422, the first positioning hole 42224 and the second positioning hole 42225 are arranged in an up-and-down mode, a fixed seat 42226 is arranged on the connecting body 422 on the outer side of the second positioning hole 42225, and a locking pin 42228 which is connected through the spring and used for releasing the locking state of the limiting protrusion 42227 and the second positioning hole 42225 is arranged in the fixed seat 42226. The separating portion 4282 is provided with a through hole, the driving rod 42222 is inserted into the mounting groove 421 corresponding to the end and is provided with a limit portion 422221 near the end, and the through hole is suitable for passing through the driving rod 42222 corresponding to the end and blocking the limit portion 422221.

When the flexible sealing member 31 is used, when the end of the flexible sealing member 31 is first installed on any one of the first bearing disk short pipe 10 and the second bearing disk short pipe 20, the connecting body 422 penetrates through the hole of the flange on the short pipe and enters into the installation groove 421 of the pressing member 41, the end of the active rod 42222 on the connecting body 422 enters into the through hole in advance, as the connecting body 422 continues to enter, the separation part 4282 compresses the elastic part 4281 towards the bottom of the installation groove 421 under the action of the limit part 422221, the thrust body 426 is released and moves towards the inside of the installation groove 421 to the final position under the action of the spring inside the installation hole 423, as the connecting body 422 continues to enter, the thrust body 426 moves towards the inside of the installation hole 423 along the end structure under the action of the end part of the connecting body 422 and compresses the spring at the position, when the end of the thrust body 426 enters the transition area 4271, the thrust body 426 presses the transition area 4271 under the action of the self spring, so that the connecting body 422 continues to enter into the installation groove 421 until the thrust body 426 enters into the thrust part 4272 to complete the locking state of the connecting body 422, and at the same time, the flexible sealing member 31 is pressed; when maintenance and replacement are needed, the limit boss 42227 and the second positioning hole 42225 are unlocked only by pressing the locking pin 42228, the spring on the active rod 42222 can eject the active rod 42222 outwards, so that the limit boss 42227 and the first positioning hole 42224 are locked, the end head of the active rod 42222 can be recovered to the initial position, the separating part 4282 can move outwards under the action of the elastic part 4281, the thrust body 426 is separated from the thrust part 4272, the connecting body 422 is released, the connecting body 422 is removed from the inside of the mounting groove 421, the disassembly work of the end part of the flexible sealing element 31 and the short pipe flange can be completed, when a new product is installed again, the active rod 42222 only needs to be pushed towards the inside of the connecting body 422 until the limit boss 42227 and the second positioning hole 42225 are in a locking state, and then the connecting body 422 is connected with the corresponding mounting groove 421.

Example 3: as shown in fig. 3, the following modifications are made on the basis of one of the above embodiments: the flexible sealing element 31 is provided with a connecting body 32, the pressing piece 41 is provided with a connecting convex body 43, and the connecting body 32 is hooped in a connecting groove of the connecting convex body 43 on the pressing piece 41. When the flexible sealing element 31 is connected with the corresponding short pipe flange, the flexible sealing element is firstly installed and connected through the connecting groove and the engaging convex body 43 on the pressing piece 41, and the end part of the flexible sealing element 31 can be better pressed and processed through the mode.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. The substitution may be of partial structures, devices, method steps, or may be a complete solution. The technical solutions and the inventive concepts of the present invention should be covered by the protection scope of the present invention by adding equivalent substitutions or changes.

Claims

1. The utility model provides a quick assembly disassembly's scalable wear-resisting nipple, its characterized in that includes basin nozzle stub (10), basin nozzle stub two (20) and sets up scalable seal structure (30) between the two, and the both ends of scalable seal structure (30) are installed in the corresponding end of basin nozzle stub (10) and basin nozzle stub two (20) through coupling assembling (40), and a water pipe is external to basin nozzle stub (10).

2. The quick-release telescopic wear-resistant nipple of claim 1, wherein the telescopic sealing structure (30) comprises a flexible sealing member (31), and the connecting assembly (40) comprises a pressing member (41) for pressing the end of the flexible sealing member (31) against the corresponding ends of the first basin stub (10) and the second basin stub (20), and a connecting member (42) for pressing the pressing member (41) against the corresponding ends of the first basin stub (10) and the second basin stub (20).

3. A quick release telescopic wear nipple according to claim 2, in which the flexible seal (31) is provided with an engagement body (32), the pressure member (41) is provided with an engagement projection (43), and the engagement body (32) is mounted around the connection groove of the engagement projection (43) of the pressure member (41).

4. The quick-release retractable wear-resistant nipple of claim 2, wherein the connecting member (42) comprises a mounting groove (421) formed on the side of the pressing member (41) opposite to the flexible seal member (31), and a connecting body (422) inserted into the mounting groove (421), and a thrust structure is mounted inside the mounting groove (421).

5. The quick-mounting and dismounting telescopic wear-resistant nipple according to claim 4, wherein the thrust structure comprises a mounting hole (423) and a limiting body (428) which are arranged at the side of the pressing member (41) and communicated with the mounting groove (421), a screw (424), a spring and a thrust body (426) are mounted in the mounting hole (423), the thrust body (426) is partially exposed at the inner side of the mounting groove (421), a thrust region (427) which is matched and mounted with the thrust body (426) is arranged on the connecting body (422), and the limiting body (428) is suitable for controlling the thrust body (426) to advance and retreat.

6. The quick-release telescopic wear-resistant nipple of claim 5, wherein the fitting portions of the thrust body (426) and the thrust region (427) are arranged in a spherical structure, the thrust region (427) comprises a transition portion (4271) and a thrust portion (4272), the transition portion (4271) and the thrust portion (4272) are arranged in an arc structure, and the corresponding radius of the transition portion (4271) is larger than that of the thrust portion (4272).

7. The quick-assembly and disassembly telescopic wear-resistant nipple of claim 5, wherein the stopper (428) comprises an elastic part (4281) mounted inside the mounting groove (421) and a separating part (4282) connected with the elastic part (4281) and slidably arranged inside the mounting groove (421), and the separating part (4282) is adapted to control the pushing body (426) to advance and retreat in a spherical structure.

8. The quick-release retractable wear-resistant nipple of claim 7, wherein said connecting body (422) comprises a body (4221) provided with a thrust region (427) and a through hole (4222) provided in the middle of the body (4221), the through hole (4222) having a driving structure mounted therein for switching the forward and backward movement of the separating portion (4282).

9. The quick-assembly and disassembly telescopic wear-resistant nipple according to claim 8, wherein the active structure comprises a stepped hole arranged in the middle of the connecting body (422), a spring is arranged in the stepped hole, an active rod (42222) penetrates through the interior of the spring, a first bearing platform abutted against the end of the spring and a second bearing platform positioned on the top of the first bearing platform are arranged on the active rod (42222), a limiting piece (42223) is arranged on the side of the first bearing platform, a limiting protrusion (42227) is arranged at the free end of the limiting piece (42223), a first positioning hole (42224) and a second positioning hole (42225) matched with the limiting protrusion (42227) are arranged on the connecting body (422), the first positioning hole (42224) and the second positioning hole (42225) are arranged up and down, a fixed seat (42226) is arranged on the connecting body (422) on the outer side of the second positioning hole (42225), and a locking pin (42228) which is connected through the spring and used for releasing the locking state of the limiting protrusion (42227) and the second positioning hole (42225) is arranged inside the fixed seat (42226).

10. The quick-release retractable wear-resistant nipple of claim 8, wherein a through hole is provided on the separating portion (4282), the driving rod (42222) is inserted into the mounting groove (421) corresponding to the end and provided with a limit portion (422221) near the end, and the through hole is adapted to pass through the driving rod (42222) corresponding to the end and block the limit portion (422221).