CN217861043U - Auxiliary assembly tool - Google Patents

Abstract

The application discloses supplementary erecting tool for the assembly flange straight tube relates to oil gas field construction operation equipment technical field. This supplementary assembling tool includes the supporting seat, the supporting seat includes first pedestal, second pedestal and two at least axis of rotation, first pedestal with the second pedestal sets up relatively, two at least axis of rotation rotationally set up in first pedestal with between the second pedestal, each the axis of rotation all be used for with the outer peripheral face contact of flange straight tube, and each the axis of rotation is followed the peripheral direction of flange straight tube sets up at interval in proper order, the flange straight tube can be for each the axis of rotation is rotatory, in order to adjust the position in the flange hole of flange straight tube. The scheme can solve the problem that the flange holes of the existing flange straight pipes are difficult to align.

Description

Auxiliary assembly tool

Technical Field

The application belongs to the technical field of oil and gas field construction operation equipment, and particularly relates to an auxiliary assembling tool.

Background

In oil and gas drilling or fracturing operations, a straight flange pipe is an indispensable component. Along with the popularization of large-drift-diameter wells in construction operation well sites, the application of large-drift-diameter flange straight pipes corresponding to the large-drift-diameter wells is more and more common. However, due to uneven ground of a construction operation well site and the heavy weight of the large-diameter flange straight pipe, the assembly is difficult in the process of connecting the large-diameter flange straight pipe, and the problems of difficult alignment of flange holes, low assembly efficiency and the like exist. At present, a well site is hoisted by a crane, a flange straight pipe is butted with a flange hole after being hoisted, and the problem that the flange hole is difficult to align still exists.

SUMMERY OF THE UTILITY MODEL

The purpose of this application embodiment is to provide an auxiliary assembly tool for the assembly flange straight tube can solve the difficult problem of flange hole alignment of present flange straight tube.

In order to solve the technical problem, the present application is implemented as follows:

the embodiment of the application provides an auxiliary assembly tool for the assembly flange straight tube, including the supporting seat, the supporting seat includes first pedestal, second pedestal and two at least axis of rotation, first pedestal with the second pedestal sets up relatively, two at least axis of rotation rotationally set up in first pedestal with between the second pedestal, each the axis of rotation all be used for with the outer peripheral face contact of flange straight tube, and each the axis of rotation is followed the peripheral direction of flange straight tube is interval setting in proper order, the flange straight tube can be for each the axis of rotation is rotatory, in order to adjust the position in the flange hole of flange straight tube.

In this application embodiment, will treat the flange straight tube of installation and place on the supporting seat, each axis of rotation of supporting seat and the outer peripheral face contact of flange straight tube, because area of contact between the two is less to make the frictional force between flange straight tube and the supporting seat less, the flange straight tube can rotate for each axis of rotation is nimble, with the position of adjusting the flange hole of this flange straight tube, make the flange hole of this flange straight tube align with the flange hole of adjacent flange straight tube, so that this flange straight tube installation, thereby improve the assembly efficiency of flange straight tube. Therefore, the problem that the flange holes of the existing flange straight pipes are difficult to align can be solved.

Drawings

FIG. 1 is an assembly view of a mounting flange straight tube of an auxiliary assembly tool disclosed in an embodiment of the present application;

fig. 2 to 3 are exploded views of the auxiliary assembly tool disclosed in the embodiment of the present application from different perspectives;

fig. 4 to 5 are structural views of the auxiliary assembling tool disclosed in the embodiment of the present application from different perspectives;

fig. 6 is a schematic structural view of the first seat disclosed in the embodiment of the present application;

fig. 7 to 9 are schematic structural views of the support member disclosed in the embodiment of the present application at different viewing angles;

fig. 10 to 11 are schematic structural views of the connection sleeve and the operation rod disclosed in the embodiment of the present application at different viewing angles;

FIG. 12 is a cross-sectional view of the attachment sleeve and lever disclosed in an embodiment of the present application;

fig. 13 to 14 are schematic structural views of a base disclosed in an embodiment of the present application at different viewing angles;

FIGS. 15-18 are assembly views from different perspectives of a flange straight tube mounted to an auxiliary assembly tool as disclosed in another embodiment of the present application;

fig. 19 to 20 are schematic structural views of an auxiliary assembly tool disclosed in another embodiment of the present application at different viewing angles.

Description of the reference numerals:

100-flange straight pipe, 110-flange hole;

200-a supporting seat, 201-a fifth connecting piece, 202-a first nut, 203-a second nut, 204-a third nut, 205-a fourth nut, 210-a first seat body, 220-a second seat body, 230-a rotating shaft, 240-a first connecting piece, 250-a second connecting piece, 260-a third connecting piece, 270-a fourth connecting piece, 280-a first bearing and 290-a second bearing;

300-connecting the belt;

400-rotating tool, 410-operating part;

500-supporting frame, 510-base, 511-third base, 512-first connecting rod, 520-supporting piece, 521-supporting frame, 522-second connecting rod, 530-connecting sleeve, 531-unthreaded hole, 532-threaded hole and 540-operating rod;

610-third connector, 620-fourth connector.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The auxiliary assembly tool provided in the embodiments of the present application is described in detail through specific embodiments and application scenarios thereof with reference to the accompanying drawings.

As shown in fig. 1 to 20, the present embodiment discloses an auxiliary assembly tool for assembling a flange straight pipe 100, but the auxiliary assembly tool may also be used for assembling other structures, and is not limited herein. This supplementary assembling tool includes supporting seat 200, supporting seat 200 includes first pedestal 210, second pedestal 220 and two at least axis of rotation 230, first pedestal 210 sets up with second pedestal 220 relatively, two at least axis of rotation 230 rotationally set up between first pedestal 210 and second pedestal 220, each axis of rotation 230 all is used for the outer peripheral face contact with flange straight tube 100, the outer peripheral face of each axis of rotation 230 and the outer peripheral face of flange straight tube 100 are the arcwall face promptly, and each axis of rotation 230 sets up along the peripheral direction interval in proper order of flange straight tube 100, thereby ensure that each axis of rotation 230 all can rotate in a flexible way. The straight flange pipes 100 are rotatable about respective rotational axes 230 to adjust the positions of the flange holes 110 of the straight flange pipes 100.

In the embodiment of the present application, the flange straight pipes 100 to be mounted are placed on the supporting base 200, each rotating shaft 230 of the supporting base 200 contacts with the outer peripheral surface of the flange straight pipe 100, and because the contact area between the two is small, the friction force between the flange straight pipe 100 and the supporting base 200 is small, the flange straight pipe 100 can rotate relative to each rotating shaft 230, so as to adjust the position of the flange hole 110 of the flange straight pipe 100, and align the flange hole 110 of the flange straight pipe 100 with the flange hole of the adjacent flange straight pipe, so that the flange straight pipe 100 is mounted conveniently, and the assembly efficiency of the flange straight pipe 100 is improved. Therefore, the embodiment of the application can solve the problem that the alignment of the flange holes 110 of the existing flange straight pipe 100 is difficult.

As shown in fig. 15 to 20, in an alternative embodiment, the supporting base 200 further includes a first connecting member 240 and a second connecting member 250, the first connecting member 240 is connected between the first end of the first base 210 and the first end of the second base 220, and the second connecting member 250 is connected between the second end of the first base 210 and the second end of the second base 220, so as to improve the connection firmness between the first base 210 and the second base 220. At least two rotating shafts 230 are located between the first connecting piece 240 and the second connecting piece 250, the auxiliary assembling tool further comprises a connecting band 300, two ends of the connecting band 300 are respectively connected with the first connecting piece 240 and the second connecting piece 250, and the supporting seat 200 and the connecting band 300 form a limiting hole surrounding the flange straight tube 100, so that the flange straight tube 100 is limited. The external equipment adjusts the height of the supporting seat 200 through the connecting belt 300, so that the flange straight pipe 100 placed on the supporting seat 200 and the adjacent flange straight pipe are at the same height; the flanged straight pipe 100 is then rotated so that the flange holes 110 of the flanged straight pipe 100 are aligned with the flange holes of an adjacent flanged straight pipe. Therefore, the auxiliary assembling tool in the embodiment of the application has a simple structure and is easy to operate. Alternatively, the external device may be a crane or the like, and is not limited thereto.

Optionally, the first connector 240 and the second connector 250 may be studs, and the support seat 200 further includes a first nut 202, a second nut 203, a third nut 204, and a fourth nut 205, where the first nut 202 and the second nut 203 are respectively in threaded fit with two ends of the first connector 240, and the third nut 204 and the fourth nut 205 are respectively in threaded fit with two ends of the second connector 250, so as to improve stability of the support seat 200.

In an alternative embodiment, the supporting seat 200 further includes a fifth connecting member 201, the fifth connecting member 201 is connected between the first seat 210 and the second seat 220, and in the height direction of the supporting seat 200, an orthographic projection of the fifth connecting member 201 is located between the first connecting member 240 and the second connecting member 250, so as to further improve the connection stability between the first seat 210 and the second seat 220. Further alternatively, the fifth connecting member 201 may be disposed at the bottom of the first seat 210 and the bottom of the second seat 220, and in the height direction of the supporting seat 200, the orthographic projection of the fifth connecting member 201 is located between the orthographic projections of the two adjacent rotating shafts 230, so as to avoid interference on the rotating shafts 230 on the basis of ensuring the connection firmness between the first seat 210 and the second seat 220.

Alternatively, the fifth connecting member 201 may be a bolt, but may also be other connecting fasteners, and is not limited herein.

Alternatively, the straight flange pipe 100 can be driven to rotate manually, but the weight of the straight flange pipe 100 is large, and therefore the operation is laborious. Therefore, in another optional embodiment, the auxiliary assembly tool further includes a rotation tool 400, the rotation tool 400 includes a first positioning portion, a second positioning portion and an operation portion 410, one end of the first positioning portion and one end of the second positioning portion are both connected to the operation portion 410, the other end of the first positioning portion and the other end of the second positioning portion are respectively used for inserting into different flange holes 110 of the flange straight pipe, the first positioning portion and the second positioning portion are respectively matched with different flange holes 110 in a positioning manner, the flange straight pipe 100 is driven to rotate by the operation portion 410, and at this time, the flange straight pipe 100 is driven to rotate by driving the operation portion 410, which is labor-saving and convenient to operate.

Optionally, the first positioning portion and the second positioning portion may both be located at one end of the operation portion 410, and the first positioning portion and the second positioning portion are disposed at an interval, and at this time, the other end of the operation portion 410 is a free end, and the length of the free end may be increased, so as to extend the length of the force arm, so as to save more labor.

In another alternative embodiment, the first seat 210 has a first limiting groove, the second seat 220 has a second limiting groove, the first limiting groove and the second limiting groove are both disposed opposite to the outer peripheral surface of the straight flange pipe 100, the outer peripheral surface of each rotating shaft 230 protrudes out of the groove bottom of the first limiting groove, so that a first gap exists between the first limiting groove and the outer peripheral surface of the straight flange pipe 100, and the outer peripheral surface of each rotating shaft 230 protrudes out of the groove bottom of the second limiting groove, so that a second gap exists between the second limiting groove and the outer peripheral surface of the straight flange pipe 100. In the process of installing the flange straight pipe 100, once the rotating shaft 230 is deformed or damaged, the flange straight pipe 100 is supported in the first limiting groove and the second limiting groove, so that the flange straight pipe 100 is prevented from falling off, and the safety is improved.

In yet another alternative embodiment, the auxiliary assembly tool further includes a support frame 500, and the support frame 500 may be directly placed on the ground. The supporting frame 500 includes a base 510 and a supporting member 520, the supporting member 520 is movably disposed on the base 510, the base 510 is disposed on an end of the supporting member 520 away from the base 510, and the supporting member 520 can move relative to the base 510 to adjust a height of the supporting base 200. According to the scheme, the supporting seat 200 is placed on the supporting frame 500, so that the supporting seat 200 can be more stable, and the installation of the flange straight pipe 100 is facilitated; moreover, the support seat 200 is adjusted by the support frame 500, so that the controllability is higher, and the installation efficiency of the flange straight pipe 100 is improved.

In a further alternative embodiment, one end of the support seat 200, which is away from the flange straight tube 100, is provided with a third connecting portion 260 and a fourth connecting portion 270, the third connecting portion 260 and the fourth connecting portion 270 may be flange structures, and the support seat 200 is connected to the support 520 through the third connecting portion 260 and the fourth connecting portion 270, specifically, one ends of the first seat body 210 and the second seat body 220 of the support seat 200, which are away from the flange straight tube 100, are provided with the third connecting portion 260 and the fourth connecting portion 270, and the first seat body 210 and the second seat body 220 are both connected to the support 520 through the third connecting portion 260 and the fourth connecting portion 270, optionally, the third connecting portion 260 and the fourth connecting portion 270 and the first seat body 210 may be an integrated structure, and the third connecting portion 260 and the fourth connecting portion 270 and the second seat body 220 may also be an integrated structure. Third connecting portion 260 and fourth connecting portion 270 interval set up, in auxiliary assembly tool's direction of height, the orthographic projection of the rotation center axle of flange straight tube 100 is located between the orthographic projection of third connecting portion 260 and the orthographic projection of fourth connecting portion 270, make the focus of flange straight tube 100 fall between third connecting portion 260 and fourth connecting portion 270, at the rotatory in-process of flange straight tube 100, with the stability that improves flange straight tube 100, avoid supporting seat 200 slope or even turn on one's side and lead to flange straight tube 100 to drop.

Alternatively, the orthographic projection of the rotation center axis of the flange straight pipe 100 is located in the middle of the orthographic projection of the third connecting portion 260 and the orthographic projection of the fourth connecting portion 270 in the height direction of the auxiliary assembly tool, thereby further improving the stability of the flange straight pipe 100.

Optionally, one surface of the supporting member 520 facing the supporting seat 200 has a first protrusion and a second protrusion, the first protrusion and the second protrusion are disposed opposite to each other, the auxiliary assembly tool further includes a third connecting member 610 and a fourth connecting member 620, the first protrusion is connected to the third connecting member 260 through the third connecting member 610, the second protrusion is connected to the fourth connecting member 270 through the fourth connecting member 620, and at least a portion of the third connecting member 260 and the fourth connecting member 270 is located between the first protrusion and the second protrusion, so as to increase a connection area between the supporting seat 200 and the supporting member 520, and improve stability of the supporting seat 200.

Alternatively, the third connecting member 610 and the fourth connecting member 620 may be both cylindrical pins, which have good positioning performance, and prevent the supporting seat 200 from moving or shaking along the axial direction of the cylindrical pins, although the third connecting member 610 and the fourth connecting member 620 may also be other fasteners, such as studs, bolts, etc., and are not limited herein.

In another alternative embodiment, the base 510 includes a third body 511 and a first connecting rod 512, and the bottom surface of the third body 511 can be larger, so as to improve the stability of the whole auxiliary assembly tool. The first connecting rod 512 is disposed on the third seat 511, the supporting member 520 includes a supporting frame 521 and a second connecting rod 522, the second connecting rod 522 is connected to the supporting seat 200 through the supporting frame 521, the second connecting rod 522 is movably connected to the first connecting rod 512, and the second connecting rod 522 can move relative to the first connecting rod 512 to adjust the height of the supporting seat 200. The support frame 521 has a larger support surface, so that the support base 200 can be conveniently arranged; in addition, the inside of the supporting frame 521 is a cavity, so that the weight of the supporting frame 521 is small, and the supporting frame 500 can be conveniently detached and moved.

Alternatively, a driving mechanism, such as a motor and a lead screw, may be disposed on the first connecting rod 512 to drive the second connecting rod 522 to move relative to the first connecting rod 512, and to avoid the driving mechanism from being affected by the external environment, the driving mechanism needs to be disposed inside the first connecting rod 512, which increases the size of the first connecting rod 512 and is relatively high in cost. Therefore, in a further alternative embodiment, the supporting frame 500 further includes a connecting sleeve 530, the connecting sleeve 530 has an optical hole 531 and a threaded hole 532 which are communicated, a diameter of the optical hole 531 is larger than a diameter of the threaded hole 532, an end of the first connecting rod 512 facing away from the third seat 511 is in threaded fit with the threaded hole 532, a connecting area between the connecting sleeve 530 and the first connecting rod 512 is larger at this time, an end of the second connecting rod 522 facing away from the supporting seat 200 is supported in the connecting sleeve 530 through the optical hole 531, a connecting area between the connecting sleeve 530 and the second connecting rod 522 is larger at this time, and the connecting sleeve 530 can rotate relative to the first connecting rod 512 to adjust a height at which the second connecting rod 522 is located. The connecting sleeve 530 can also displace relative to the first connecting rod 512 when rotating relative to the first connecting rod 512, the second connecting rod 522 is inserted into the light hole 531 of the connecting sleeve 530, the bottom of the light hole 531 provides a supporting force for the second connecting rod 522, and an assembly gap exists between the side walls of the second connecting rod 522 and the light hole 531, so as to meet the purpose that the second connecting rod 522 rotates relative to the connecting sleeve 530, and meanwhile, the supporting seat 200 and the second connecting rod 522 can be prevented from rotating along with the connecting sleeve 530.

In a further alternative embodiment, the auxiliary assembly tool further includes a lever 540, the lever 540 is disposed on the outer periphery of the connection sleeve 530, and the connection sleeve 530 is driven to move relative to the first connection rod 512 by the lever 540. In this case, the length of the lever 540 is increased to increase the length of the moment arm, so that the operator can drive the connection sleeve 530 to rotate with a smaller driving force. Alternatively, the operating rod 540 and the connecting sleeve 530 may be fixedly connected by welding or the like, which is not limited in this respect.

Alternatively, the number of levers 540 may be at least two, with each lever 540 being spaced around the outer circumference of the attachment sleeve 530 to provide a plurality of operating positions for the operator.

In an alternative embodiment, the first seat 210 is provided with a first mounting hole, the second seat 220 is provided with a second mounting hole, the two ends of the rotating shaft 230 are respectively provided with a first connecting portion and a second connecting portion, the supporting seat 200 further includes a first bearing 280 and a second bearing 290, the first bearing 280 is disposed in the first mounting hole, the first connecting portion is rotatably connected with the first seat 210 through the first bearing 280, the second connecting portion is disposed in the second mounting hole, and the second connecting portion is rotatably connected with the second seat 220 through the second bearing 290. Because the bearing has the characteristic of reducing the friction coefficient of the mechanical load and has better precision, performance and reliability, the rotating shaft 230 is rotatably connected with the first seat 210 and the second seat 220 through the first bearing 280 and the second bearing 290, which is beneficial to improving the rotating flexibility of the rotating shaft 230; and the first bearing 280 and the second bearing 290 are both rigid structures, which can bear larger load, and are beneficial to protecting the first seat body 210 and the second seat body 220.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the present embodiments are not limited to those precise embodiments, which are intended to be illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope of the appended claims.

Claims (10)

1. The utility model provides an auxiliary assembly tool for assembling flange straight tube (100), its characterized in that includes supporting seat (200), supporting seat (200) include first pedestal (210), second pedestal (220) and two at least axis of rotation (230), first pedestal (210) with second pedestal (220) set up relatively, two at least axis of rotation (230) rotationally set up in between first pedestal (210) and second pedestal (220), each axis of rotation (230) all be used for with the outer peripheral face contact of flange straight tube (100), and each axis of rotation (230) along the peripheral direction of flange straight tube (100) sets up at interval in proper order, flange straight tube (100) can be for each axis of rotation (230) is rotatory, in order to adjust the position of flange hole (110) of flange straight tube (100).

2. The auxiliary assembling tool according to claim 1, wherein the supporting seat (200) further comprises a first connecting member (240) and a second connecting member (250), the first connecting member (240) is connected between the first end of the first seat (210) and the first end of the second seat (220), the second connecting member (250) is connected between the second end of the first seat (210) and the second end of the second seat (220), the at least two rotating shafts (230) are located between the first connecting member (240) and the second connecting member (250), the auxiliary assembling tool further comprises a connecting band (300), two ends of the connecting band (300) are connected with the first connecting member (240) and the second connecting member (250), and the supporting seat (200) and the connecting band (300) form a limiting hole surrounding the straight flange pipe (100).

3. The sub-assembly tool according to claim 1, further comprising a rotation tool (400), wherein the rotation tool (400) comprises a first positioning portion, a second positioning portion and an operation portion (410), one end of the first positioning portion and one end of the second positioning portion are connected to the operation portion (410), the other end of the first positioning portion and the other end of the second positioning portion are respectively used for being inserted into different flange holes (110) of the straight flange pipe, and the straight flange pipe (100) is driven to rotate by the operation portion (410).

4. The auxiliary assembling tool according to claim 1, wherein the first seat (210) is provided with a first limiting groove, the second seat (220) is provided with a second limiting groove, the first limiting groove and the second limiting groove are both disposed opposite to the outer peripheral surface of the straight flange pipe (100), the outer peripheral surface of each rotating shaft (230) protrudes from the bottom of the first limiting groove, so that a first gap exists between the first limiting groove and the outer peripheral surface of the straight flange pipe (100), and the outer peripheral surface of each rotating shaft (230) protrudes from the bottom of the second limiting groove, so that a second gap exists between the second limiting groove and the outer peripheral surface of the straight flange pipe (100).

5. The auxiliary assembly tool according to claim 1, further comprising a support frame (500), wherein the support frame (500) comprises a base (510) and a support (520), the support (520) is movably disposed on the base (510), the support base (200) is disposed at an end of the support (520) facing away from the base (510), and the support (520) is movable relative to the base (510) to adjust a height of the support base (200).

6. The auxiliary assembling tool according to claim 5, wherein one end of the support seat (200) facing away from the straight flange pipe (100) is provided with a third connecting portion (260) and a fourth connecting portion (270), the support seat (200) is connected with the support member (520) through the third connecting portion (260) and the fourth connecting portion (270), the third connecting portion (260) and the fourth connecting portion (270) are arranged at intervals, and in the height direction of the auxiliary assembling tool, the orthographic projection of the rotation central axis of the straight flange pipe (100) is located between the orthographic projection of the third connecting portion (260) and the orthographic projection of the fourth connecting portion (270).

7. The auxiliary assembly tool of claim 5, wherein the base (510) comprises a third seat body (511) and a first connecting rod (512), the first connecting rod (512) is disposed on the third seat body (511), the support (520) comprises a supporting frame (521) and a second connecting rod (522), the second connecting rod (522) is connected to the supporting seat (200) through the supporting frame (521), the second connecting rod (522) is movably connected to the first connecting rod (512), and the second connecting rod (522) is movable relative to the first connecting rod (512) to adjust the height of the supporting seat (200).

8. The auxiliary assembling tool as claimed in claim 7, wherein the supporting frame (500) further comprises a connecting sleeve (530), the connecting sleeve (530) has a light hole (531) and a threaded hole (532) which are communicated with each other, the diameter of the light hole (531) is greater than that of the threaded hole (532), one end of the first connecting rod (512) facing away from the third seat (511) is in threaded fit with the threaded hole (532), one end of the second connecting rod (522) facing away from the supporting seat (200) is supported in the connecting sleeve (530) through the light hole (531), and the connecting sleeve (530) can rotate relative to the first connecting rod (512) to adjust the height of the second connecting rod (522).

9. The auxiliary fitting tool according to claim 8, further comprising an operation rod (540), wherein the operation rod (540) is disposed on an outer circumferential surface of the connection sleeve (530), and the connection sleeve (530) is driven to move relative to the first connection rod (512) by the operation rod (540).

10. The auxiliary assembling tool according to claim 1, wherein the first seat (210) is provided with a first mounting hole, the second seat (220) is provided with a second mounting hole, the two ends of the rotating shaft (230) are respectively provided with a first connecting portion and a second connecting portion, the supporting base (200) further comprises a first bearing (280) and a second bearing (290), the first bearing (280) is disposed in the first mounting hole, the first connecting portion is rotatably connected with the first seat (210) through the first bearing (280), the second connecting portion is disposed in the second mounting hole, and the second connecting portion is rotatably connected with the second seat (220) through the second bearing (290).

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