Guide pipe welding tool

Abstract

The utility model provides a catheter welding tool, and relates to the technical field of medical instruments. The guide pipe welding tool comprises a frame body, a first heating mold and a second heating mold. The first heating mold is arranged on the frame body in a sliding manner and is provided with a first through hole, and a first welding area is arranged on the inner wall of the first through hole; the second heating mold is provided with a second through hole coaxial with the first through hole, and the inner wall of the second through hole is provided with a second welding area; the second through hole and the first through hole are used for containing a first pipe body, a second pipe body and a third pipe body in sequence, the first heating mold slides on the frame body so that the two ends of the second pipe body can be located in a first welding area and a second welding area respectively, and the second pipe body abuts against the first pipe body in the second welding area; the third pipe body can move in the axial direction of the first through hole so that the second pipe body can abut against the third pipe body in the first welding area. According to the tool, three sections of pipe bodies can be welded at a time, the welding positions of the pipe bodies do not need to be calibrated, the welding time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a catheter welding tool. Background Art

[0002] With the continuous advancement of medical imaging technology, angiography catheters, as a key medical device for percutaneous angiography, are gaining increasing attention. The primary function of angiography catheters is to provide a guide, enabling the smooth introduction of contrast agents into the blood vessels, thereby producing clear angiographic results. To achieve this function, the catheters must possess appropriate hardness, elasticity, flexibility, and torsional strength, as well as excellent X-ray transparency and shape memory. Furthermore, the catheter wall should be smooth to enhance imaging performance and minimize the risk of thrombosis.

[0003] During the manufacturing process of angiographic catheters, the tube body is usually divided into a braided section, a non-braided section, and a tip tube. The hardness of each section is designed to decrease in sequence to reduce damage to the blood vessels. The different sections of the tube body are usually connected by segmented welding. Common welding methods include hot air welding, laser welding, and metal mold welding. However, these welding methods often face the problems of long welding cycles and the possibility of the tube body adhering to the mold during the welding process in actual applications, resulting in low production efficiency and unstable product quality. In addition, the heating position of the welding equipment is usually located inside the mold, resulting in the invisible position of the weld point during the welding process. The operator can only mark the length on the outside of the tube body. This operation method is not only highly repetitive, but also has the risk of wrong weld points. Utility Model Content

[0004] The purpose of this application is to provide a catheter welding tool, which can complete the welding of three sections of the pipe body at one time, the welding positions of different sections are adjustable, and there is no need to calibrate the welding position of the pipe body during the welding process, thereby improving production efficiency.

[0005] An embodiment of the present application provides a catheter welding tool, comprising: a frame; a first heating mold, the first heating mold is slidably arranged on the frame, the first heating mold has a first through hole extending therethrough, and the inner wall of the first through hole is provided with a first welding area; a second heating mold, the second heating mold has a second through hole coaxial with the first through hole, and the inner wall of the second through hole is provided with a second welding area; the second through hole and the first through hole are used to sequentially accommodate the first tube body, the second tube body and the third tube body, the first heating mold slides on the frame so that the two ends of the second tube body are respectively located in the first welding area and the second welding area, and the second tube body abuts the first tube body in the second welding area; the third tube body can move along the axial direction of the first through hole so that the second tube body abuts the third tube body in the first welding area.

[0006] The catheter welding fixture includes a frame, a first heating mold, and a second heating mold. The first heating mold has a first through-hole extending therethrough, and the inner wall of the first through-hole is provided with a first welding area specifically for welding the first tube body to the second tube body. The second heating mold has a second through-hole coaxial with the first through-hole, and the inner wall of the second through-hole is provided with a second welding area for welding the second tube body to the third tube body. The first heating mold is slidably mounted on the frame, allowing it to be adjusted as needed so that the distance between the first welding area and the second welding area is consistent with the length of the second tube body. In addition, the third tube body can move axially along the first through-hole so that the second and third tube bodies accurately abut at the first welding area, thereby improving welding accuracy. Through this fixture design, three sections of tube body can be welded together in one go using metal mold welding on the welding fixture. The welding positions of different sections of the fixture are adjustable to meet the requirements of different tube lengths. Moreover, there is no need to calibrate the welding position of the tube body during the welding process, which shortens welding time and improves production efficiency. The visual welding area makes it easier for operators to determine the welding position, thereby improving alignment accuracy during the welding process and significantly reducing the risk of misaligned welds. Furthermore, the design of the tooling improves the stability of the pipe during welding, reduces deformation of the pipe due to high temperatures or mechanical forces, and enhances welding reliability. Therefore, the catheter welding tooling provided by this application not only improves welding quality and production efficiency, but also meets the welding requirements of catheters of various lengths.

[0007] In one possible implementation, the above-mentioned catheter welding tool also includes a clamp, which is located on the side of the first heating mold away from the second heating mold. The clamp has a third through hole that is coaxial with the first through hole to clamp the third tube body. The clamp is slidably arranged on the frame so that the third tube body can move axially along the first through hole.

[0008] By providing a clamp on the frame, the third tube body can be safely and firmly clamped to avoid displacement of the tube body during welding, thereby improving the accuracy and reliability of welding. In addition, the clamp is slidably arranged on the frame, and the position of the third tube body can be easily adjusted so that the third tube body can be docked with the second tube body in the first welding area.

[0009] In a possible implementation, the frame includes a slide rail and a slider. The extension direction of the slide rail is consistent with the axial direction of the first through hole. The slider can move toward the extension direction of the slide rail, and the clamp is provided on the slider.

[0010] By designing the structure of the slide rail and the slider, the slider can move along the slide rail. The clamp is set on the slider, and the clamp can move along the extension direction of the slide rail with the slider, making it easy to adjust the position of the clamp as needed to adapt to the welding of different pipe bodies.

[0011] In a possible implementation, a sliding groove is provided on one of the components of the slide rail and the slider, and a protrusion that cooperates with the sliding groove is provided on the other component.

[0012] Furthermore, by providing a matching structure of the slide groove and the protrusion, the connection stability between the slider and the slide rail is enhanced, so that the slider slides smoothly, the reliability of the operation is improved, and loosening or jamming during operation is avoided.

[0013] In a possible implementation, the catheter welding tool further includes a first shell and a second shell, the first heating mold is accommodated in the first shell, the second heating mold is accommodated in the second shell, and both the first shell and the second shell are movably connected to the slide rail.

[0014] The first heating mold and the second heating mold are respectively accommodated in the first shell and the second shell. The shell protects and fixes the heating film. The first shell and the second shell are movably connected to the slide rail. Therefore, during the welding process, the positions of the first heating mold and the second heating mold can be adjusted as needed to facilitate better welding of the pipe body.

[0015] In one possible implementation, the slide rail is provided with a plurality of limiting holes arranged along the extension direction of the slide rail, and the first shell and the second shell are provided with at least one limiting rod, and at least one limiting rod can enter the limiting hole to selectively fix the first shell and the second shell to the limiting hole of the slide rail.

[0016] By setting a limit hole and a limit rod structure on the slide rail, the first shell and the second shell are limited. Since the slide rail is provided with a plurality of limit holes arranged and distributed along the extension direction of the slide rail, the positions of the first shell and the second shell can be adjusted as needed. Furthermore, under the action of the limit structure, the heating mold can be kept in a predetermined position during the welding process, thereby improving the welding accuracy.

[0017] In one possible implementation, a first heating coil is provided on the first heating mold, and the first heating coil is located outside the first welding area so as to heat the first welding area; a second heating coil is provided on the second heating mold, and the second heating coil is located outside the second welding area so as to heat the second welding area.

[0018] The first heating coil and the second heating coil are respectively located outside the first welding area and the second welding area, which can effectively heat the welding area and improve the welding efficiency and welding quality.

[0019] In a possible implementation, the hole wall of the first through hole has a first coating, and the hole wall of the second through hole has a second coating.

[0020] The first coating and the second coating are used to reduce the friction between the tube body and the inner walls of the first heating mold and the second heating mold respectively, reducing the sticking phenomenon of the tube body during welding, reducing processing time, and improving welding smoothness.

[0021] In a possible implementation, the catheter welding tool further includes a welding mandrel, which is used to sequentially penetrate the third tube body, the second tube body, and the first tube body fixed to the catheter welding tool to position the three tube bodies.

[0022] By inserting a welding core shaft into the first heating mold and the second heating mold, multiple tubes can be inserted sequentially during the welding process, and support can be provided for the tubes, thereby improving the accuracy and stability of welding, and improving the efficiency of welding and the integration of the process.

[0023] In a possible implementation, the welding core shaft has a first end and a second end opposite to each other, the second end faces one side of the second through hole, and an outer diameter of the first end is greater than an outer diameter of the second end.

[0024] The larger outer diameter of the first end effectively positions the welding mandrel during welding, preventing it from shifting during welding and ensuring welding accuracy. Furthermore, the larger outer diameter of the first end provides a better support surface, helping to withstand the pressure and stress of the pipe during welding and preventing workpiece deformation due to thermal expansion or mechanical forces during welding. The smaller outer diameter of the second end allows the welding mandrel to easily pass through the second through-hole, facilitating quick assembly and disassembly during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of the structure of the slide rail, slider and clamp provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the structure of a slider provided in an embodiment of the present application;

[0028] Figure 3 This is the state before the catheter welding tool provided in the embodiment of the present application is started;

[0029] Figure 4 This is the state of the catheter welding tool provided in the embodiment of the present application after startup.

[0030] Icons: 101-slide rail; 102-slide groove; 103-slider; 104-clamp; 1041-third through hole; 105-first screw; 201-first shell; 202-first heating mold; 2021-first thread; 203-first heating coil; 204-first welding area; 205-first coating; 206-second screw; 301-second shell; 302-second heating mold; 3021-second thread; 303-second heating coil; 304-second welding area; 305-second coating; 306-third screw; 401-welding mandrel; 4011-first end; 4012-second end; 402-first tube; 403-second tube; 404-third tube; 405-first welding point; 406-second welding point. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0036] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0037] Example

[0038] Figure 1 A schematic diagram of the structure of the slide rail 101, the slider 103 and the clamp 104 provided in an embodiment of the present application; Figure 2 A schematic structural diagram of the slider 103 provided in an embodiment of the present application; Figure 3 This is the state before the catheter welding tool provided in the embodiment of the present application is started; Figure 4 This is the state after the catheter welding tool provided in the embodiment of the present application is started; please refer to Figure 1-Figure 4 .

[0039] This embodiment provides a welding tool, including: a frame; a first heating mold 202, the first heating mold 202 is slidably set on the frame, the first heating mold 202 has a first through hole running through it, and the inner wall of the first through hole is provided with a first welding area 204; a second heating mold 302, the second heating mold 302 has a second through hole coaxial with the first through hole, and the inner wall of the second through hole is provided with a second welding area 304; the second through hole and the first through hole are used to accommodate the first tube body 402, the second tube body 403 and the third tube body 404 in sequence, the first heating mold 202 slides on the frame so that the two ends of the second tube body 403 are respectively located in the first welding area 204 and the second welding area 304, and the second tube body 403 abuts the first tube body 402 in the second welding area 304; the third tube body 404 can move along the axial direction of the first through hole so that the second tube body 403 abuts the third tube body 404 in the first welding area 204.

[0040] In the catheter welding tool, the frame can provide overall support, improve the stability of the pipe body during welding, thereby reducing the deformation of the pipe body caused by high temperature or mechanical force, and improving the reliability of welding; the first heating mold 202 and the second heating mold 302 are slidably arranged on the frame, so that their positions can be adjusted as needed; the first heating mold 202 has a first through hole running through it, and the inner wall of the first through hole is provided with a first welding area 204, the second heating mold 302 has a second through hole coaxial with the first through hole, and the inner wall of the second heating mold 302 is provided with a second welding area 304, wherein the first welding area 204 and the second welding area 304 are used for the pipe body Welding; the second through hole and the first through hole sequentially accommodate the first tube body 402, the second tube body 403, and the third tube body 404, so that one end of the first tube body 402 is located in the second welding area 304, the two ends (welding ends) of the second tube body 403 are respectively located in the first welding area 204 and the second welding area 304, and one end of the third tube body 404 is located in the first welding area 204; thus, after the tooling is started, the welding of the three sections of the tube body can be completed at one time. There is no need to calibrate the welding position of the tube body during the welding process, which shortens the welding time and improves production efficiency. Moreover, the welding position of different sections of the tooling is adjustable to meet the requirements of different lengths of the tube body. In addition, the visual welding area makes it easier for operators to judge the welding position, so that the alignment accuracy during the welding process is improved and the risk of wrong welding points is significantly reduced.

[0041] Among them, such as Figure 1 As shown, the frame includes a slide rail 101 and a slider 103. The extension direction of the slide rail 101 is consistent with the axial direction of the first through hole, and the slider 103 can move in the extension direction of the slide rail 101; a clamp 104 is provided on the slider 103, and the slider 103 and the clamp 104 are threadedly fixedly connected by a first screw 105, so that the clamp 104 can move along the extension direction of the slide rail 101 along with the slider 103 on the slide rail 101.

[0042] like Figure 1 and Figure 2 As shown, the clamp 104 is located on the side of the first heating mold 202 away from the second heating mold 302, and the clamp 104 has a third through hole 1041 that is coaxial with the first through hole to clamp the third tube body 404. That is to say, the clamp 104 is slidably set on the frame, and the third tube body 404 can move axially along the first through hole; during welding, the third tube body 404 is firmly clamped in the third through hole 1041, so the third tube body 404 will not be displaced or fall off, thereby improving the accuracy and reliability of welding; moreover, since the clamp 104 is slidably set on the frame, during welding, the operator can adjust the position of the clamp 104 as needed, so that the third tube body 404 can accurately abut one end of the second tube body 403 in the welding area, thereby completing the welding.

[0043] In the embodiment of the present application, one of the slide rail 101 and the slider 103 is provided with a slide groove 102, and the other is provided with a protrusion that cooperates with the slide groove 102. In other words, there are at least two solutions for making the slide rail 101, the slide groove 102, and the slider 103 work together: as an example, the slide rail 101 is provided with a slide groove 102, and the slider 103 is provided with a protrusion that cooperates with the slide groove 102, so that the slider 103 moves along the extension direction of the slide rail 101 on the slide groove 102; as an example, the slider 103 is provided with a slide groove 102, and the slide rail 101 is provided with a protrusion that cooperates with the slide groove 102, so that the slider 103 can directly move along the extension direction of the slide rail 101.

[0044] like Figure 3 or Figure 4 As shown, a first shell 201 and a second shell 301 are provided on the slide rail 101 , the first heating mold 202 is accommodated in the first shell 201 , and the second heating mold 302 is accommodated in the second shell 301 . Both the first shell 201 and the second shell 301 are movably connected to the slide rail 101 .

[0045] In an embodiment of the present application, as an example, a plurality of limiting holes (screw holes) arranged and distributed along the extension direction of the slide rail 101 are provided on the slide rail 101, and the first shell 201 and the second shell 301 are fixed to the slide rail 101 using the second screw 206 and the third screw 306 respectively, so as to facilitate position adjustment; during welding, the positions of the first shell 201 and the second shell 301 on the slide rail 101 can be adjusted as needed, and then fixed using the second screw 206 and the third screw 306. In this way, after the tooling is started, the shell can not only protect the first heating mold 202 and the second heating mold 302, but also enable the first heating mold 202 and the second heating mold 302 to be accurately fixed during the welding process without offset, thereby improving the accuracy of welding.

[0046] In an embodiment of the present application, a first heating coil 203 is provided on the first heating mold 202, and the first heating coil 203 is located on the outside of the first welding area 204 so as to heat the first welding area 204; a second heating coil 303 is provided on the second heating mold 302, and the second heating coil 303 is located on the outside of the second welding area 304 so as to heat the second welding area 304.

[0047] As an example, a first thread 2021 is provided at the first welding area 204 on the first heating mold 202 to be fixedly connected to the first heating coil 203, and a second thread 3021 is provided at the second welding area 304 on the second heating mold 302 to be fixedly connected to the first heating coil 203. In this way, the first heating coil 203 and the second heating coil 303 can be aligned with the first welding area 204 and the second welding area 304, respectively. During welding, the welding areas can be heated more effectively, thereby improving welding efficiency and welding quality.

[0048] In an embodiment of the present application, the inner walls of the first heating mold 202 and the second heating mold 302, that is, the walls of the first through hole and the second through hole, are coated with a first coating 205 and a second coating 305, respectively, to reduce the friction between the tube body and the inner walls of the first heating mold 202 and the second heating mold 302. In traditional mold welding, a release agent that reduces friction needs to be added after processing a certain number of products. The catheter welding tool provided in the present application eliminates the need for repeated application of a release agent by coating the inner surface of the mold. During welding, due to the reduction in frictional resistance, the tube body can slide more smoothly in the through hole, reducing the jamming of the tube body during the welding process, thereby reducing welding time and improving production efficiency.

[0049] The catheter welding tool provided herein also includes a welding mandrel 401. This mandrel 401 is sequentially inserted into a third tube body 404, a second tube body 403, and a first tube body 402, all of which are secured to the catheter welding tool, to position the three tube bodies. The welding mandrel 401 has a first end 4011 and a second end 4012, opposing each other. The second end 4012 faces toward the second through hole, and the outer diameter of the first end 4011 is greater than the outer diameter of the second end 4012. The welding core shaft 401 is inserted into the first heating mold 202 and the second heating mold 302. When inserting the welding core shaft 401, the second end 4012 (small end) is inserted from the first heating mold 202 and the second heating mold 302 in sequence, and exits from the right side of the second heating mold 302; after confirming the welding point distance, the first tube body 402, the second tube body 403 and the third tube body 404 are inserted in sequence from the left side of the welding core shaft 401, that is, the first end 4011 (large end) of the welding core shaft 401. After welding is completed, the tube body is pulled out from the first end 4011 of the welding core shaft 401.

[0050] The working principle of the catheter welding tool provided in the embodiment of the present application is as follows:

[0051] When welding, before starting, it is necessary to confirm the length of the second tube body 403, adjust the distance between the first shell 201 and the second shell 301, so that the distance between the first heating coil 203 and the second heating coil 303 on the tooling is the length of the second tube body 403, and then use the second screw 206 and the third screw 306 to fix the first shell 201 and the second shell 301 respectively; after confirming the distance between the welding points, insert the first tube body 402, the second tube body 403 and the third tube body 404 in turn from the left large end of the welding core shaft 401, and then start the tooling; after the tooling is started, the third through hole 1041 of the clamp 104 is firmly clamped The third tube body 404, the slider 103 slides along the extension direction of the slide rail 101, and moves the third tube body 404 in the direction close to the second tube body 403. Since the length of the second tube body 403 has been confirmed, the first welding point 405 and the second welding point 406 will accurately fall on the first heating coil 203 and the second heating coil 303 respectively; after the heating is completed, the clamp 104 will release the third tube body 404, and the first tube body 402, the second tube body 403 and the third tube body 404 will be welded to each other at the first welding point 405 and the second welding point 406. Finally, the three sections of the tube body are pulled out from the large end of the welding core shaft 401 to complete one welding work.

[0052] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A catheter welding tool, characterized in that: include: frame; a first heating mold, the first heating mold being slidably disposed on the frame, the first heating mold having a first through hole extending therethrough, and an inner wall of the first through hole being provided with a first welding area; a second heating mold, wherein the second heating mold has a second through hole coaxial with the first through hole, and an inner wall of the second through hole is provided with a second welding area; The second through hole and the first through hole are used to sequentially accommodate the first tube body, the second tube body and the third tube body, and the first heating mold slides on the frame so that the two ends of the second tube body are respectively located in the first welding area and the second welding area, and the second tube body abuts the first tube body in the second welding area; the third tube body can move along the axial direction of the first through hole so that the second tube body abuts the third tube body in the first welding area.

2. The catheter welding tool according to claim 1, characterized in that: It also includes a clamp, which is located on the side of the first heating mold away from the second heating mold. The clamp has a third through hole that is coaxial with the first through hole to clamp the third tube body. The clamp is slidably set on the frame so that the third tube body can move axially along the first through hole.

3. The catheter welding tool according to claim 2, characterized in that: The frame includes a slide rail and a slider. The extension direction of the slide rail is consistent with the axial direction of the first through hole. The slider can move toward the extension direction of the slide rail. The clamp is provided on the slider.

4. The catheter welding tool according to claim 3, characterized in that: A sliding groove is provided on one of the components of the slide rail and the slider, and a protrusion matched with the sliding groove is provided on the other component.

5. The catheter welding tool according to claim 3, characterized in that: It also includes a first shell and a second shell, the first heating module is accommodated in the first shell, the second heating module is accommodated in the second shell, and the first shell and the second shell are both movably connected to the slide rail.

6. The catheter welding tool according to claim 5, characterized in that: The slide rail is provided with a plurality of limiting holes arranged and distributed along the extension direction of the slide rail, and the first shell and the second shell are provided with at least one limiting rod, and the at least one limiting rod can enter the limiting hole to selectively fix the first shell and the second shell to the limiting hole of the slide rail.

7. The catheter welding tool according to any one of claims 1 to 6, characterized in that: The first heating mold is provided with a first heating coil, and the first heating coil is located outside the first welding area so as to heat the first welding area; The second heating mold is provided with a second heating coil, and the second heating coil is located outside the second welding area so as to heat the second welding area.

8. The catheter welding tool according to any one of claims 2 to 6, characterized in that: The hole wall of the first through hole has a first coating layer, and the hole wall of the second through hole has a second coating layer.

9. The catheter welding tool according to any one of claims 2 to 6, characterized in that: It also includes a welding core shaft, which is used to sequentially penetrate the third tube body, the second tube body and the first tube body fixed on the catheter welding tool to position the three tube bodies.

10. The catheter welding tool according to claim 9, characterized in that: The welding core shaft has a first end and a second end opposite to each other, the second end faces one side of the second through hole, and the outer diameter of the first end is greater than the outer diameter of the second end.

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