Pipeline butt welding auxiliary tool

Abstract

When a pipeline needs to be subjected to butt welding with a pipe neck of a hubbed flange, one end of the pipeline is placed in a partial length area of a pipeline alignment groove, and the position of an alignment frame relative to a jacking piece is adjusted, so that the extending length of the alignment frame relative to the pipeline is matched with the length of the pipe neck of the hubbed flange; in addition, the jacking piece can be kept at the position, close to the end, of the pipeline, then the jacking piece gets close to and abuts against the pipeline, the pipeline butt welding auxiliary tool is located at one end of the pipeline, then the pipe neck of the hubbed flange can be placed into the extending pipeline alignment groove for auxiliary alignment, and therefore butt welding of the pipeline and the pipe end of the hubbed flange can be assisted. The pipeline butt welding auxiliary tool can be suitable for butt welding of the pipe ends between two pipelines and butt welding of the pipe ends of the pipelines and hubbed flanges, and is good in universality.

Description

Technical Field

[0001] This utility model relates to pipeline welding, and in particular to an auxiliary tooling for pipeline butt welding. Background Technology

[0002] Some existing pipelines sometimes need to be butt-welded to another pipeline at one end. Before welding, a pipeline butt-welding auxiliary fixture can be used to assist in alignment. One existing pipeline butt-welding auxiliary fixture has an alignment frame fixed on a base. The alignment frame has two alignment plates at an included angle, forming a pipeline alignment groove. A pressure member is located on one side of the alignment frame and can be adjusted towards or away from the pipeline alignment groove. In use, the pipeline is placed into a portion of the pipeline alignment groove, and the pressure member presses against the pipeline near one end. At this point, the two alignment plates and the pressure member make contact with the pipeline at three points, thus positioning it on the pipeline. A portion of the alignment frame extends out, allowing the operator to hold another pipeline and place it into the pipeline alignment groove, quickly aligning it using the two alignment plates. Then, the other hand welds the joint.

[0003] Sometimes, the outer circumference of the pipeline is not smooth enough, and the jacking component needs to be placed near the end of the pipeline to ensure that the alignment bracket fits as closely as possible to the end area of ​​the pipeline, improving alignment accuracy. However, some pipelines need to be welded to the neck of a necked flange at the end. The neck of the necked flange is relatively short, and in order to avoid the flange plate portion of the necked flange, the extension of the alignment bracket relative to the pipeline is also relatively short. This requires the alignment bracket and jacking component to be moved back and placed against the pipeline at a position far from the end, affecting the accuracy of the pipe end welding. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes an auxiliary tooling for pipe welding, which is applicable to pipe end welding between two pipes and pipe end welding to a flange with a neck, and has good versatility.

[0005] The pipe welding auxiliary fixture according to an embodiment of the present invention includes a base, an alignment frame, and a pressing structure. The alignment frame is disposed on the base and includes two alignment plates arranged at an included angle, forming a pipe alignment groove between the two alignment plates. The pressing structure is disposed on the base and located on one side of the alignment frame, the pressing structure being opposite to the opening of the pipe alignment groove. The pressing structure is adjustablely positioned on the base and can move closer to or further away from the pipe alignment groove. The alignment frame is movably disposed on the base along the length direction of the pipe alignment groove, so that the distance between one end of the alignment frame and the pressing structure along the length direction of the pipe alignment groove is adjustable.

[0006] The pipe butt welding auxiliary fixture according to the embodiments of this utility model has at least the following beneficial effects: When it is necessary to butt weld a pipe to the neck of a flange with a neck, one end of the pipe is placed into a portion of the length of the pipe alignment groove, and the position of the alignment bracket relative to the pressure member is adjusted so that the length of the alignment bracket extending relative to the pipe matches the length of the flange with a neck, and the pressure member can be held in a position near the end of the pipe. Then, the pressure member approaches and abuts against the pipe, so that the pipe butt welding auxiliary fixture is positioned at one end of the pipe. The neck of the flanged pipe can be inserted into the extended pipe alignment groove for auxiliary alignment, thereby assisting in the butt welding of the pipe to the flanged pipe end. When two conventional pipes need to be butt welded, the position of the alignment bracket relative to the pressure member can be adjusted until the alignment bracket is in relatively even contact with the two conventional pipes respectively, and the pressure member abuts against the end of a certain pipe. The above-mentioned auxiliary tooling for pipe butt welding is applicable to the butt welding of the pipe ends between two pipes and the butt welding of the pipe ends to the flanged pipe end, and has good versatility.

[0007] According to some embodiments of the present invention, the base is provided with a sliding groove along the length direction of the pipeline alignment groove, and the alignment frame is slidably disposed in the sliding groove.

[0008] According to some embodiments of the present invention, one end of the two alignment plates is joined together, the alignment frame is provided with a spot weld clearance through hole, the spot weld clearance through hole is located at the joint of the two alignment plates, the spot weld clearance through hole is connected to the bottom of the pipeline alignment groove, and the joint of the two alignment plates is located on the moving axis of the top pressure structure relative to the base.

[0009] According to some embodiments of the present invention, the spot welding clearance through hole is strip-shaped and extends along the length direction of the pipeline alignment groove, and at least two spot welding clearance through holes are provided and arranged at intervals along the length direction of the pipeline alignment groove.

[0010] According to some embodiments of the present invention, the base is provided with a clearance notch, which is opposite to and communicates with the spot-welded clearance through hole.

[0011] According to some embodiments of this utility model, the two alignment plates are integrally formed, and the alignment frame is an angle steel.

[0012] According to some embodiments of the present invention, the base is provided with a threaded through hole, the axis of the threaded through hole is set along the depth direction of the pipeline alignment groove, and the top pressure structure includes a threaded fastener, which is threadedly connected to the threaded through hole.

[0013] According to some embodiments of the present invention, the alignment frame further includes two alignment rollers, which are arranged along the length of the pipeline alignment groove. The two alignment rollers are rotatably connected to the two alignment plates in a one-to-one correspondence. The top pressing structure is rotatably provided with ball bearings, which are located at one end of the top pressing structure near the pipeline alignment groove.

[0014] According to some embodiments of the present invention, the top pressure structure further includes a mounting bracket, the ball bearing is rotatably disposed on the mounting bracket, the ball bearing portion is exposed relative to the mounting bracket, the mounting bracket is disposed at one end of the threaded fastener near the pipeline alignment groove, and the alignment bracket is detachably connected to the base.

[0015] According to some embodiments of the present invention, the mounting bracket includes a bracket body and a mounting nut, the ball bearing is rotatably connected to the bracket body, the mounting nut is fixedly connected to the bracket body, the threaded fastener is a bolt, and the mounting nut is threadedly connected to the bolt.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a three-dimensional schematic diagram of the pipe welding auxiliary tooling according to the first embodiment of the present utility model;

[0019] Figure 2 This is an exploded view of the pipe welding auxiliary tooling according to the first embodiment of the present invention;

[0020] Figure 3 This is a three-dimensional schematic diagram of the pipe welding auxiliary tooling according to the second embodiment of the present utility model;

[0021] Figure 4 This is the second embodiment of the present utility model. Figure 3 A cross-sectional view along the AA direction.

[0022] Figure label:

[0023] Base 100, slide 110, clearance notch 120;

[0024] Alignment frame 200, pipeline alignment groove 201, spot welding clearance through hole 202, alignment plate 210, alignment roller 220;

[0025] Top pressure structure 300, threaded fastener 310, ball bearing 320, mounting bracket 330, bracket body 331, mounting nut 332. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] Reference Figures 1 to 2 This utility model's first embodiment of a pipe welding auxiliary fixture includes a base 100, an alignment frame 200, and a pressing structure 300. The alignment frame 200 is disposed on the base 100 and includes two alignment plates 210 arranged at an included angle, forming a pipe alignment groove 201 between the two alignment plates 210. The pressing structure 300 is disposed on the base 100 and located on one side of the alignment frame 200, with the pressing structure 300 facing the opening of the pipe alignment groove 201. The pressing structure 300 is adjustablely positioned on the base 100 and can move closer to or further away from the pipe alignment groove 201. The alignment frame 200 is movably disposed on the base 100 along the length direction of the pipe alignment groove 201, so that the distance between one end of the alignment frame 200 and the pressing structure 300 along the length direction of the pipe alignment groove 201 is adjustable.

[0031] When butt welding is required between the pipe and the neck of the flange with a neck, one end of the pipe is inserted into a portion of the pipe alignment groove 201, and the position of the alignment bracket 200 relative to the pressure member is adjusted so that the length of the alignment bracket 200 extending from the pipe matches the length of the flange neck, and the pressure member is held in a position near the end of the pipe. The pressure member then approaches and presses against the pipe, positioning the butt welding auxiliary tooling at one end of the pipe. The neck of the flange can then be inserted into the extended pipe neck. The alignment groove 201 is used for auxiliary alignment, which can assist in the butt welding of the pipeline to the end of the flange with neck. When two conventional pipelines need to be butt welded, the alignment bracket 200 can be adjusted relative to the top pressure member until the alignment bracket 200 is in relatively uniform contact with the two conventional pipelines respectively, and the top pressure member abuts against the end of a certain pipeline. The above-mentioned pipeline butt welding auxiliary tooling can be used for butt welding of the ends of two pipelines as well as butt welding of the ends of pipelines to flanges with neck, and has good versatility.

[0032] Specifically, the butt welding referred to in this utility model is applicable to butt welding of two pipes with basically the same diameter, as well as butt welding of a pipe and a pipe neck with basically the same diameter.

[0033] In this embodiment, the base 100 is provided with a sliding groove 110 along the length of the pipeline alignment groove 201, and the alignment frame 200 is slidably disposed in the sliding groove 110. By providing the sliding groove 110 on the base 100 and slidably connecting the alignment frame 200 to the sliding groove 110, the alignment frame 200 can move relative to the base 100. Since the top pressure member is installed on the base 100, the alignment frame 200 can move relative to the top pressure member along the length of the pipeline alignment groove 201 to adjust the distance between them. The structure is simple and easy to implement.

[0034] Specifically, when the auxiliary tooling is installed at the end of the pipeline, the top pressure member and the two alignment plates 210 of the alignment bracket 200 cooperate to clamp the end of the pipeline. At this time, the alignment bracket 200 is fixed relative to the pipeline and the base 100 along the length direction of the pipeline alignment groove 201. When the top pressure member is released, the alignment bracket 200 can slide relative to the base 100 and the pipeline along the length direction of the pipeline alignment groove 201.

[0035] It is conceivable that in other embodiments, a dovetail slider can be provided on the base 100 and a dovetail groove 110 can be provided on the alignment frame 200. The dovetail groove 110 extends along the length direction of the pipeline alignment groove 201, and the dovetail slider is slidably connected to the dovetail groove 110, so that the alignment frame 200 can move relative to the base 100.

[0036] In this embodiment, one end of the two alignment plates 210 is connected, and the alignment frame 200 is provided with a spot weld clearance through hole 202. The spot weld clearance through hole 202 is located at the joint of the two alignment plates 210 and is connected to the bottom of the pipeline alignment groove 201. The joint of the two alignment plates 210 is located on the moving axis of the top pressure structure 300 relative to the base 100.

[0037] Specifically, when pipes are connected to each other, or when a pipe is connected to the neck of a flange with a neck, a joint gap is created. Welding is then performed at this joint gap. However, the joint gap within the pipe alignment groove 201 cannot usually be directly welded; welding can only be performed after the auxiliary fixture is disassembled. This leaves approximately half of the joint gap unwelded during disassembly, potentially leading to insufficient connection stability between the two pipes. Therefore, a spot welding clearance hole 202 is provided on the alignment bracket 200. This hole directly connects to the bottom of the pipe alignment groove 201. When installing the auxiliary fixture, workers can directly spot weld the pipe portion within the alignment groove 201 through the clearance hole 202, thereby improving the connection stability at the joint when the auxiliary fixture is disassembled.

[0038] In this embodiment, the spot welding clearance through-hole 202 is strip-shaped and extends along the length of the pipe alignment groove 201. At least two spot welding clearance through-holes 202 are provided and arranged at intervals along the length of the pipe alignment groove 201. The spot welding clearance through-holes 202 are strip-shaped and arranged in multiples. When the butt joint is located at different positions within the pipe alignment groove 201, spot welding can be basically performed through the spot welding clearance through-holes 202. When the auxiliary tooling is installed in the pipe, the position of the alignment bracket 200 can be more flexible; and the impact of opening the spot welding clearance through-holes 202 on the structural strength of the alignment bracket 200 is minimized.

[0039] Specifically, three spot welding clearance through holes 202 are provided. It is conceivable that in other embodiments, one, two or more spot welding clearance through holes 202 may be provided, and those skilled in the art may choose according to actual needs.

[0040] In this embodiment, the base 100 is provided with a clearance notch 120, which is opposite to and connected to the spot welding clearance through hole 202. The clearance notch 120 facilitates the welding torch to avoid the base 100 and perform spot welding through the spot welding clearance through hole 202, reducing the risk of interference between the base 100 and the welding torch.

[0041] In this embodiment, the two alignment plates 210 are integrally formed, and the alignment frame 200 is made of angle steel. Using angle steel to make the alignment frame 200, with the two flanges of the angle steel forming the two alignment plates 210, is a simple and easy-to-implement manufacturing method.

[0042] In this embodiment, the base 100 is provided with a threaded through hole, the axis of which is set along the depth direction of the pipe alignment groove 201. The pressing structure 300 includes a threaded fastener 310, which is threadedly connected to the threaded through hole. By tightening the threaded fastener 310, which is threadedly connected to the threaded through hole of the base, the pressing structure 300 can be driven closer to the pipe alignment groove 201, thereby clamping and positioning itself on the pipe with the alignment frame 200; and the pressing structure 300 can also be driven away from the pipe alignment groove 201 to loosen the pipe and allow the auxiliary tooling to be disassembled. Using the threaded fastener 310 in conjunction with the threaded through hole to adjust the position of the pressing structure 300 is relatively simple and makes it easy to maintain the stability of the pressing structure 300 when pressing the pipe.

[0043] When the auxiliary fixture is installed on the pipeline, about half of the pipeline joint gap is blocked by the alignment bracket 200 and cannot be welded. Welding can only be carried out after the auxiliary fixture is removed. Therefore, the following improvements are made:

[0044] Reference Figures 3 to 4 In the second embodiment, the alignment frame 200 further includes two alignment rollers 220, which are arranged along the length of the alignment groove 201 of the pipeline. The two alignment rollers 220 are rotatably connected to the two alignment plates 210 in a one-to-one correspondence. The top pressure structure 300 is rotatably provided with ball bearings 320, which are located at one end of the top pressure structure 300 near the alignment groove 201 of the pipeline. When the auxiliary tooling is installed on the pipeline, the ball bearings 320 and the two alignment rollers 220 respectively abut against the pipeline. Since the alignment rollers 220 are arranged along the length of the alignment groove 201 of the pipeline, that is, the rotation axis of the alignment rollers 220 is balanced with the length of the alignment groove 201 of the pipeline, the auxiliary tooling can rotate around the central axis of the pipeline through the ball bearings 320 and the two alignment rollers 220. Thus, the area of ​​the butt joint that is blocked can be adjusted by rotation. The welding process of the entire circumferential butt joint can be completed without disassembling the auxiliary tooling, thereby improving the accuracy of the pipe end welding. It should be understood that, due to the presence of the alignment roller 220, this auxiliary tooling cannot move relative to the pipeline along the length of the pipeline alignment groove 201 when the top pressure structure 300 is not released.

[0045] In the second embodiment, the top pressure structure 300 further includes a mounting bracket 330, a ball bearing 320 is rotatably disposed on the mounting bracket 330, a portion of the ball bearing 320 is exposed relative to the mounting bracket 330, the mounting bracket 330 is disposed on one end of the threaded fastener 310 near the pipeline alignment groove 201, and the alignment bracket 200 is detachably connected to the base 100.

[0046] The ball bearing 320 is mounted on the threaded fastener 310 via the mounting bracket 330. The alignment bracket 200 is detachably connected to the base 100, which is the auxiliary tooling of the second embodiment. The threaded fastener 310 and the base 100 of the auxiliary tooling of the first embodiment can be used to improve the versatility between parts.

[0047] In the second embodiment, the mounting bracket 330 includes a bracket body 331 and a mounting nut 332. A ball bearing 320 is rotatably connected to the bracket body 331, and the mounting nut 332 is fixedly connected to the bracket body 331. The threaded fastener 310 is a bolt, and the mounting nut 332 is threadedly connected to the bolt. The mounting bracket 330 is directly threadedly connected to the threaded fastener 310 via the mounting nut 332, thereby achieving detachable installation onto the threaded fastener 310. The structure is simple and the installation is convenient.

[0048] Specifically, the frame body 331 includes a cylinder and a limiting plate. The limiting plate is located inside the cylinder and surrounds the cylinder to form a chamber that allows the ball bearing 320 to roll. This chamber has an opening. After the ball bearing 320 is inserted into the cylinder, the limiting plate restricts the position of the ball bearing 320, allowing it to protrude through the opening. When the mounting frame 330 is installed onto one end of the threaded fastener 310, one end of the threaded fastener 310 abuts against the limiting plate to prevent the limiting plate from loosening relative to the cylinder and to maintain partial exposure of the ball bearing 320. The limiting plate can be made of a self-lubricating material to reduce wear on the ball bearing 320. The alignment roller 220 can be made of, for example, polyurethane to prevent the pipeline from slipping freely relative to the alignment roller 220.

[0049] It is conceivable that in other embodiments, the mounting bracket 330 may also be equipped with a magnet, and the threaded fastener 310 may be made of iron and detachably installed at the threaded fastener 310 by magnetic attraction; the top pressing structure 300 may also be equipped with a ball joint sleeve, which has a spherical cavity, and the ball 320 is rotatably connected in the cavity. The ball joint sleeve may be connected to one end of the threaded fastener 310 by snap-fit, magnetic attraction or threaded connection.

[0050] Specifically, the alignment bracket 200 is slidably placed into the groove 110 of the base 100, making the two detachably connected. It is conceivable that in some embodiments, the alignment bracket 200 may also be detachably connected to the base 100 by magnetic attraction.

[0051] Specifically, in the first embodiment of the auxiliary tooling, a threaded fastener 310 is threadedly connected to a base 100, and an alignment frame 200 is slidably mounted on the base 100. The alignment frame 200 is composed of two alignment plates 210 joined together. In the second embodiment of the auxiliary tooling, a threaded fastener 310 is threadedly connected to a base 100, and a mounting bracket 330 is threadedly mounted on the threaded fastener 310. One end of the mounting bracket 330 has an exposed ball bearing 320. The alignment frame 200 is slidably mounted on the base 100, and the alignment frame 200 has two alignment rollers 220. The auxiliary tooling of the first embodiment can be manufactured by mounting the mounting bracket 330 with the ball bearing 320 on the threaded fastener 310 and replacing the alignment frame 200 with the alignment rollers 220. This allows the auxiliary tooling of the second embodiment to be produced using the original auxiliary tooling of the first embodiment, reusing some parts, reducing material and processing costs, and eliminating the need to remanufacture all parts.

[0052] It should be understood that, under certain requirements, the auxiliary tooling of the second embodiment can also be made into the auxiliary tooling of the first embodiment by disassembling the mounting bracket 330 and replacing the alignment bracket 200.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pipe butt welding auxiliary tooling, characterized in that, include: Base (100); Alignment frame (200) is disposed on the base (100). The alignment frame (200) includes two alignment plates (210) arranged at an included angle, and a pipeline alignment groove (201) is formed between the two alignment plates (210). A top pressure structure (300) is disposed on the base (100) and located on one side of the alignment frame (200). The top pressure structure (300) is opposite to the slot of the pipeline alignment groove (201). The top pressure structure (300) is disposed on the base (100) in an adjustable position and can be close to or away from the pipeline alignment groove (201). The alignment frame (200) is movably disposed on the base (100) along the length direction of the pipeline alignment groove (201) so that the distance between one end of the alignment frame (200) and the top pressure structure (300) along the length direction of the pipeline alignment groove (201) is adjustable.

2. The auxiliary tooling for pipe butt welding according to claim 1, characterized in that: The base (100) is provided with a sliding groove (110) along the length direction of the pipeline alignment groove (201), and the alignment frame (200) is slidably disposed in the sliding groove (110).

3. The auxiliary tooling for pipe butt welding according to claim 1, characterized in that: The two alignment plates (210) are joined at one end, and the alignment frame (200) is provided with a spot weld clearance through hole (202). The spot weld clearance through hole (202) is located at the joint of the two alignment plates (210), and the spot weld clearance through hole (202) is connected to the bottom of the pipeline alignment groove (201). The joint of the two alignment plates (210) is located on the moving axis of the top pressure structure (300) relative to the base (100).

4. The auxiliary tooling for pipe butt welding according to claim 3, characterized in that: The spot welding clearance through hole (202) is strip-shaped and extends along the length direction of the pipeline alignment groove (201). At least two spot welding clearance through holes (202) are provided and are arranged at intervals along the length direction of the pipeline alignment groove (201).

5. The auxiliary tooling for pipe butt welding according to claim 3, characterized in that: The base (100) is provided with a clearance notch (120), which is opposite to and connected to the spot weld clearance through hole (202).

6. The auxiliary tooling for pipe butt welding according to claim 3, characterized in that: The two alignment plates (210) are integrally formed, and the alignment frame (200) is an angle steel.

7. The auxiliary tooling for pipe butt welding according to claim 1, characterized in that: The base (100) is provided with a threaded through hole, the axis of which is set along the depth direction of the pipeline alignment groove (201), and the top pressure structure (300) includes a threaded fastener (310), which is threadedly connected to the threaded through hole.

8. The auxiliary tooling for pipe butt welding according to claim 7, characterized in that: The alignment frame (200) also includes two alignment rollers (220), which are arranged along the length of the pipeline alignment groove (201). The two alignment rollers (220) are rotatably connected to the two alignment plates (210) in a one-to-one correspondence. The top pressing structure (300) is rotatably provided with ball bearings (320), which are located at one end of the top pressing structure (300) near the pipeline alignment groove (201).

9. The auxiliary tooling for pipe butt welding according to claim 8, characterized in that: The top pressure structure (300) also includes a mounting bracket (330), the ball bearing (320) is rotatably mounted on the mounting bracket (330), the ball bearing (320) is partially exposed relative to the mounting bracket (330), the mounting bracket (330) is located at one end of the threaded fastener (310) near the pipeline alignment groove (201), and the alignment bracket (200) is detachably connected to the base (100).

10. The auxiliary tooling for pipe butt welding according to claim 9, characterized in that: The mounting bracket (330) includes a bracket body (331) and a mounting nut (332). The ball bearing (320) is rotatably connected to the bracket body (331), and the mounting nut (332) is fixedly connected to the bracket body (331). The threaded fastener (310) is a bolt, and the mounting nut (332) is threadedly connected to the bolt.

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