Pipe fitting cantilever bending tool
By designing a pipe cantilever bending fixture with adjustable clamping block connectors, the problem of needing to customize clamps for pipe fittings of different diameters in the existing technology is solved, and a convenient pipe bending stiffness test is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING JINGYI AUTOMATION EQUIP CO LTD
- Filing Date
- 2025-05-15
- Publication Date
- 2026-05-01
AI Technical Summary
When performing bending stiffness tests on pipe fittings of different diameters, existing universal testing machines require customized three-point bending test fixtures and kits, which increases the difficulty of the test and reduces efficiency.
Design a pipe cantilever bending fixture, including a first clamping block and a second clamping block, a clamping block connector with an adjustable distance between the clamping blocks, and a V-shaped clamping opening on the clamping block. It is suitable for universal testing machine fixtures, has variable clamping space, and is suitable for pipe fittings of different diameters.
It enables flexible clamping of pipe fittings of different diameters, reduces the difficulty of testing, improves testing efficiency, and facilitates the implementation of cantilever bending tests on pipe fittings.
Smart Images
Figure CN224189720U_ABST
Abstract
Description
Pipe cantilever bending fixture Technical Field
[0001] This application relates to the field of testing equipment technology, and more specifically, to a pipe cantilever bending fixture. Background Technology
[0002] In the research and development of industrial refrigeration equipment, it is necessary to analyze and predict the operating conditions of the compressor and the vibration damage and fatigue life of thin-walled metal pipe structures caused by road transportation. Among these considerations, stiffness testing of different pipe components under specific structural conditions is a crucial step in simulating and verifying the corresponding structural areas. Currently, commonly used universal testing machines require customized three-point bending test fixtures and corresponding kits for pipe components of different diameters when conducting bending stiffness tests, which brings inconvenience to the testing process. Summary of the Invention
[0003] The purpose of this application is to provide a pipe cantilever bending fixture to address at least one of the technical problems mentioned in the background art.
[0004] To achieve the above objectives, this application adopts the following technical solution:
[0005] This application provides a pipe cantilever bending fixture, characterized in that it includes a first clamping block and a second clamping block, and a clamping block connecting member for fixedly connecting to both the first clamping block and the second clamping block, wherein both the first clamping block and the second clamping block are movably engaged with the clamping block connecting member in a first direction.
[0006] A first clamping opening is formed on the first clamping block, and a second clamping opening is formed on the second clamping block. Both the first clamping opening and the second clamping opening are V-shaped openings. The first clamping opening and the second clamping opening are arranged opposite to each other in the first direction, which is the length direction of the clamping block connector. The second clamping block is used to be installed on the fixture of the universal testing machine.
[0007] Optionally, the first clamping block and the clamping block connector are detachably connected.
[0008] The beneficial effect of this technical solution is that the first clamp can be removed from the clamp connector first, then the bottom of the pipe to be tested can be placed on the two edges of the second clamp, and then the first clamp can be installed on the clamp connector to clamp the pipe to be tested, thus avoiding the first clamp from hindering the movement of the pipe to be tested when the pipe to be tested is placed in the second clamp.
[0009] Optionally, the first clamping block and the second clamping block are used to engage in the first direction.
[0010] The beneficial effects of this technical solution are as follows: In this way, the first clamp can be at least partially covered by the second clamping plate in the second direction, and the second clamp can be at least partially covered by the first clamping plate in the second direction. The space formed between the first clamp and the second clamp for clamping the pipe fitting to be tested can be varied more, thereby making the pipe fitting cantilever bending fixture applicable to a wider range of pipe diameters.
[0011] Optionally, the first clamping block includes a first clamping plate portion on which the first clamping opening is formed, and the second clamping block includes a second clamping plate portion on which the second clamping opening is formed. The first clamping plate portion and the second clamping plate portion are both parallel to the first direction, and the first clamping plate portion and the second clamping plate portion are used to stack in a second direction, which is perpendicular to the first direction.
[0012] The beneficial effect of this technical solution is that by stacking the first clamping plate and the second clamping plate in the second direction, the first clamping opening can be at least partially covered by the second clamping plate in the second direction, and the second clamping opening can be at least partially covered by the first clamping plate in the second direction. The space formed between the first clamping opening and the second clamping opening for clamping the pipe fitting to be tested can be varied more, thereby making the pipe fitting cantilever bending fixture applicable to a wider range of pipe diameters.
[0013] Optionally, the first clamping block includes a plurality of first clamping plate portions arranged in the second direction, and the second clamping block includes a plurality of second clamping plate portions arranged in the second direction, wherein each first clamping plate portion and each second clamping plate portion is arranged alternately in the second direction.
[0014] The beneficial effects of this technical solution are as follows: the first clamping openings formed on each of the first clamping plates are arranged in the second direction, and each of the first clamping openings is used to directly contact the pipe to be tested; the second clamping openings formed on each of the second clamping plates are arranged in the second direction, and each of the second clamping openings is used to directly contact the pipe to be tested, thereby making the clamping of the first clamping block and the second clamping block on the pipe to be tested more stable and firm.
[0015] Optionally, the pipe cantilever bending fixture provided in this application includes two clamping block connectors. The first clamping block further includes a first connecting seat portion, and the first clamping plate portion is fixed to the first connecting seat portion. The second clamping block further includes a second connecting seat portion, and the second clamping plate portion is fixed to the second connecting seat portion. Both the first connecting seat portion and the second connecting seat portion are connected to the two clamping block connectors. In the third direction, the two clamping block connectors are located on opposite sides of the first clamping block, and in the third direction, the two clamping block connectors are located on opposite sides of the second clamping block, and the first direction, the second direction, and the third direction are perpendicular to each other.
[0016] The beneficial effect of this technical solution is that it makes the distance between the two clamping block connectors relatively far, so that the first clamping block, the second clamping block and the two clamping block connectors are fixedly connected to form a more solid whole, thereby improving the safety and reliability of the pipe cantilever bending fixture during the test.
[0017] Optionally, two connecting through holes are formed on the second connecting seat, and two threaded through holes are formed on the first connecting seat. The clamping block connector includes a screw portion and a limiting end fixed to one end of the screw portion. The two screw portions pass through the two connecting through holes one by one and cooperate with the two threaded through holes one by one. The limiting end is located on the side of the second connecting seat away from the first clamping block.
[0018] The beneficial effects of this technical solution are as follows: when adjusting the distance between the first clamping block and the second clamping block, rotating the two clamping block connectors causes the first clamping block to gradually approach the second clamping block. When the first clamping block and the second clamping block clamp the pipe to be tested, pressure is applied to the pipe to be tested through the contact between the limiting end and the second connecting seat, and the connection between the screw part and the threaded through hole.
[0019] Optionally, the pipe cantilever bending fixture provided in this application further includes a rod-shaped clamping member, one end of which is mounted on the second clamping block, and the rod-shaped clamping member is used for clamping by the fixture of the universal testing machine.
[0020] The beneficial effects of this technical solution are as follows: by specially setting a rod-shaped clamping member to connect the second clamping block and the fixture of the universal testing machine, the structure of the second clamping block can be simplified, the production of the second clamping block can be facilitated, the manufacturing time of the pipe cantilever bending fixture can be shortened, and the manufacturing efficiency of the pipe cantilever bending fixture can be improved.
[0021] Optionally, the rod-shaped clamping member is movably connected to the second clamping block.
[0022] The beneficial effect of this technical solution is that during the cantilever bending test of the pipe fitting, the pipe fitting under test will undergo a certain deformation, causing the rod-shaped clamping member to be movably connected to the second clamping block. This allows the connecting member between the rod-shaped clamping member and the second clamping block to adapt to the deformation of the pipe fitting under test, thereby keeping the force applied by the universal testing machine vertical.
[0023] Optionally, the pipe cantilever bending fixture provided in this application further includes a connecting bolt, wherein the rod-shaped clamping member and the second clamping block are pivotally connected by the connecting bolt, and the rod-shaped clamping member and the second clamping block are detachably connected by the connecting bolt, wherein the axial direction of the connecting bolt is perpendicular to the axial direction of the pipe to be tested.
[0024] The beneficial effects of this technical solution are as follows: that is, during the cantilever bending test of the pipe fitting, when the pipe fitting under test deforms, the rod-shaped clamping member and the second clamping block will pivot about the connecting bolt as the axis, and after the cantilever bending test of the pipe fitting is completed, it is convenient to disassemble, transport and store the cantilever bending tooling.
[0025] The technical solution provided in this application can achieve at least one of the following beneficial effects:
[0026] The pipe cantilever bending fixture provided in this application allows for adjustment of the distance between the first clamping block and the second clamping block, which in turn allows for adjustment of the distance between the first clamping opening and the second clamping opening. This makes the space formed between the first clamping opening and the second clamping opening for clamping the pipe fitting to be tested variable, thus enabling the pipe cantilever bending fixture to be used for clamping pipe fittings of different diameters. This alleviates the current problem of needing to customize three-point bending test fixtures and corresponding kits for pipe fittings of different diameters, reduces the difficulty of testing, improves the efficiency of testing, and makes it more convenient to conduct pipe cantilever bending tests.
[0027] The additional technical features and advantages of this application will become more apparent from the following description or from practical application. Attached Figure Description
[0028] To more clearly illustrate the technical solutions of the specific embodiments of this application, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0029] Figure 1 is a three-dimensional structural schematic diagram of one embodiment of the pipe cantilever bending fixture provided in this application;
[0030] Figure 2 is a three-dimensional structural schematic diagram of one embodiment of the rod-shaped clamping member provided in this application;
[0031] Figure 3 is a partial three-dimensional structural schematic diagram of an embodiment of the pipe cantilever bending fixture provided in this application for a pipe cantilever bending test. The first clamping block has not yet been installed in this figure.
[0032] Figure 4 is a three-dimensional structural schematic diagram of an embodiment of the pipe cantilever bending fixture provided in this application for a pipe cantilever bending test. In this figure, the first clamping block and the second clamping block have not yet clamped the pipe to be tested.
[0033] Figure 5 is a three-dimensional structural schematic diagram of an embodiment of the pipe cantilever bending fixture provided in this application for a pipe cantilever bending test. In this figure, the first clamping block and the second clamping block clamp the pipe to be tested.
[0034] Figure label:
[0035] 01. Screw section; 02. First clamping plate section;
[0036] 03. Second clamping plate; 04. Connecting bolts;
[0037] 05. Rod-shaped clamping component; 06. Limiting end;
[0038] 07. First connecting seat; 08. Second connecting seat;
[0039] 9. Clamping block connector; 10. Second clamping jaw;
[0040] 11. Second clamping block; 12. Bench vise;
[0041] 13. Pipe fitting to be tested; 14. First clamping block;
[0042] 15. First clamp. Detailed Implementation
[0043] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0044] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0046] As shown in Figures 1 to 5, when using a universal testing machine to perform bending stiffness tests on pipe fittings, it is necessary to customize three-point bending test fixtures and corresponding kits for pipe fittings of different diameters. The customization process is cumbersome, which increases the difficulty of the test, reduces the efficiency of the test, and causes inconvenience to the test.
[0047] This application provides a pipe cantilever bending fixture including a first clamping block 14 and a second clamping block 11, and a clamping block connector 09 for fixedly connecting to both the first clamping block 14 and the second clamping block 11. Both the first clamping block 14 and the second clamping block 11 are movably engaged with the clamping block connector 09 in a first direction.
[0048] A first clamping opening 15 is formed on the first clamping block 14, and a second clamping opening 10 is formed on the second clamping block 11. Both the first clamping opening 15 and the second clamping opening 10 are V-shaped openings. The first clamping opening 15 and the second clamping opening 10 are arranged opposite to each other in the first direction, which is the length direction of the clamping block connector 09. The second clamping block 11 is used to be installed on the fixture of the universal testing machine.
[0049] The cantilever bending fixture for pipe fittings provided in this application, when performing a cantilever bending test, externally fixes the pipe fitting 13 to be tested, specifically by clamping it with a bench vise 12, ensuring the pipe fitting 13 is horizontally positioned. The second clamping block 11 is installed on the fixture of the universal testing machine, with the first direction being vertical, and the first clamping block 14 positioned above the second clamping block 11. The distance between the first clamping block 14 and the second clamping block 11 is adjusted so that the other end of the pipe fitting 13 can extend horizontally between the first clamping block 14 and the second clamping block 11. The bottom of the pipe fitting 13 rests on the two edges of the second clamping opening 10. The distance between the first clamping block 14 and the second clamping block 11 is readjusted so that the first clamping block 14 gradually moves downward and the two edges of the first clamping opening 15 press against the top of the pipe fitting 13 to be tested. At this time, the positions of the first clamping block 14, the second clamping block 11 and the clamping block connector 09 are fixed, and the position of the pipe fitting 13 to be tested is also fixed. The universal testing machine is started so that the clamps of the universal testing machine move downward in the vertical direction, and at the same time, the pipe fitting cantilever bending fixture moves downward. Since the position of the end of the pipe fitting 13 to be tested that is fixed externally remains unchanged, the pipe fitting cantilever bending fixture begins to apply bending force to the pipe fitting 13 to be tested, and then the bending stiffness test begins.
[0050] The pipe cantilever bending fixture provided in this application allows for adjustment of the distance between the first clamping block 14 and the second clamping block 11, which in turn allows for adjustment of the distance between the first clamping opening 15 and the second clamping opening 10. This makes the space formed between the first clamping opening 15 and the second clamping opening 10 for clamping the pipe fitting 13 to be tested variable, thus enabling the pipe cantilever bending fixture to be suitable for clamping pipe fittings 13 of different diameters. This alleviates the current problem of needing to customize three-point bending test fixtures and corresponding kits for pipe fittings of different diameters, reduces the difficulty of testing, improves the efficiency of testing, and makes it more convenient to conduct pipe cantilever bending tests.
[0051] Optionally, the first clamping block 14 is detachably connected to the clamping block connector 09. In this way, the first clamping block 14 can be removed from the clamping block connector 09 first, then the bottom of the pipe to be tested 13 can be placed on the two edges of the second clamping opening 10, and then the first clamping block 14 can be installed on the clamping block connector 09 to clamp the pipe to be tested 13, so as to avoid the first clamping block 14 from obstructing the movement of the pipe to be tested 13 when the pipe to be tested 13 is placed in the second clamping opening 10.
[0052] Optionally, the first clamping block 14 and the second clamping block 11 are used to engage in the first direction. In this way, the first clamping opening 15 can be at least partially covered by the second clamping plate in the second direction, and the second clamping opening 10 can be at least partially covered by the first clamping plate in the second direction. The space formed between the first clamping opening 15 and the second clamping opening 10 for clamping the pipe fitting 13 to be tested can be varied more, thereby making the pipe cantilever bending fixture applicable to a wider range of pipe diameters of the pipe fitting 13 to be tested.
[0053] Optionally, the first clamping block 14 includes a first clamping plate portion 02, on which the first clamping opening 15 is formed. The second clamping block 11 includes a second clamping plate portion 03, on which the second clamping opening 10 is formed. Both the first clamping plate portion 02 and the second clamping plate portion 03 are parallel to the first direction. The first clamping plate portion 02 and the second clamping plate portion 03 are used to stack in a second direction, which is perpendicular to the first direction. By stacking the first clamping plate portion 02 and the second clamping plate portion 03 in the second direction, the first clamping opening 15 can be at least partially covered by the second clamping plate portion 03 in the second direction, and the second clamping opening 10 can be at least partially covered by the first clamping plate portion 02 in the second direction. The space formed between the first clamping opening 15 and the second clamping opening 10 for clamping the pipe fitting 13 to be tested can be varied more, thereby making the pipe fitting cantilever bending fixture applicable to a wider range of pipe diameters of the pipe fitting 13 to be tested.
[0054] Optionally, the first clamping block 14 includes a plurality of first clamping plate portions 02 arranged in the second direction, and the second clamping block 11 includes a plurality of second clamping plate portions 03 arranged in the second direction. Each first clamping plate portion 02 and each second clamping plate portion 03 is arranged in an alternating manner in the second direction. This arranges the first clamping openings 15 formed on each first clamping plate portion 02 in the second direction, with each first clamping opening 15 directly contacting the pipe fitting 13 to be tested. Similarly, arranges the second clamping openings 10 formed on each second clamping plate portion 03 in the second direction, with each second clamping opening 10 directly contacting the pipe fitting 13 to be tested. This makes the clamping of the first clamping block 14 and the second clamping block 11 more stable and secure. In this embodiment, "a plurality" refers to at least two.
[0055] Optionally, the pipe cantilever bending fixture provided in this embodiment includes two clamping block connectors 09. The first clamping block 14 further includes a first connecting seat portion 07, and the first clamping plate portion 02 is fixed to the first connecting seat portion 07. The second clamping block 11 further includes a second connecting seat portion 08, and the second clamping plate portion 03 is fixed to the second connecting seat portion 08. Both the first connecting seat portion 07 and the second connecting seat portion 08 are connected to the two clamping block connectors 09. In the third direction, the two clamping block connectors 09 are located on opposite sides of the first clamping block 14, and in the third direction, the two clamping block connectors 09 are located on opposite sides of the second clamping block 11, with the first direction, the second direction, and the third direction being mutually perpendicular. This makes the two clamping block connectors 09 relatively far apart, thereby forming a more robust whole after the first clamping block 14, the second clamping block 11, and the two clamping block connectors 09 are fixedly connected, achieving the purpose of improving the safety and reliability of the pipe cantilever bending fixture during the test. Of course, only one clamping block connector 09 can be provided, or two clamping block connectors 09 can be located on both sides of the first clamping block 14 in the second direction.
[0056] Optionally, two connecting through holes are formed on the second connecting seat, and two threaded through holes are formed on the first connecting seat. The clamping block connector 09 includes a screw portion 01 and a limiting end 06 fixed to one end of the screw portion 01. The two screw portions 01 pass through the two connecting through holes one by one and engage with the two threaded through holes one by one. The limiting end 06 is located on the side of the second connecting seat away from the first clamping block 14. In this embodiment, the clamping block connector 09 is preferably a bolt with a larger length. When adjusting the distance between the first clamping block 14 and the second clamping block 11, the two clamping block connectors 09 are rotated to make the first clamping block 14 gradually move closer to the second clamping block 11. When the first clamping block 14 and the second clamping block 11 clamp the pipe to be tested 13, pressure is applied to the pipe to be tested 13 through the abutment between the limiting end 06 and the second connecting seat, and the connection between the screw portion 01 and the threaded through hole. In one embodiment of this application, the connecting through hole is also a threaded hole; in another embodiment of this application, the threaded through hole is a non-threaded structure, and the screw part 01 passes through the non-threaded through hole and is connected to the nut.
[0057] Optionally, the pipe cantilever bending fixture provided in this application embodiment further includes a rod-shaped clamping member 05. One end of the rod-shaped clamping member 05 is mounted on the second clamping block 11, and the rod-shaped clamping member 05 is used for clamping by the fixture of the universal testing machine. By specially setting the rod-shaped clamping member 05 to connect the second clamping block 11 and the fixture of the universal testing machine, compared to forming a clamping structure between the second clamping block 11 and the fixture of the universal testing machine, the structure of the second clamping block 11 can be simplified, the production of the second clamping block 11 can be facilitated, the manufacturing time of the pipe cantilever bending fixture can be shortened, and the manufacturing efficiency of the pipe cantilever bending fixture can be improved.
[0058] Optionally, the rod-shaped clamping member 05 is movably connected to the second clamping block 11. During the cantilever bending test of the pipe fitting, the pipe fitting 13 under test will undergo a certain deformation. By movably connecting the rod-shaped clamping member 05 and the second clamping block 11, the connecting member between the rod-shaped clamping member 05 and the second clamping block 11 can adapt to the deformation of the pipe fitting 13 under test, thereby keeping the force applied by the universal testing machine vertical.
[0059] Optionally, the pipe cantilever bending fixture provided in this embodiment further includes a connecting bolt 04. The rod-shaped clamping member 05 and the second clamping block 11 are pivotally connected by the connecting bolt 04. The rod-shaped clamping member 05 and the second clamping block 11 are detachably connected by the connecting bolt 04. The axial direction of the connecting bolt 04 is perpendicular to the axial direction of the pipe fitting 13 to be tested. That is, during the pipe cantilever bending test, when the pipe fitting 13 to be tested deforms, the rod-shaped clamping member 05 and the second clamping block 11 will pivot about the connecting bolt 04. After the pipe cantilever bending test is completed, the pipe cantilever bending fixture is easy to disassemble, transport, and store.
[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A pipe cantilever bending fixture, characterized in that, The device includes a first clamping block and a second clamping block, and a clamping block connector for fixedly connecting the first clamping block and the second clamping block. The first clamping block and the second clamping block are both movably engaged with the clamping block connector in a first direction. A first clamping opening is formed on the first clamping block, and a second clamping opening is formed on the second clamping block. Both the first clamping opening and the second clamping opening are V-shaped openings. The first clamping opening and the second clamping opening are arranged opposite to each other in the first direction, which is the length direction of the clamping block connector. The second clamping block is used to be mounted on the fixture of the universal testing machine.
2. The pipe cantilever bending fixture according to claim 1, characterized in that, The first clamping block is detachably connected to the clamping block connector.
3. The pipe cantilever bending fixture according to claim 1, characterized in that, The first clamping block and the second clamping block are used for insertion in the first direction.
4. The pipe cantilever bending fixture according to claim 3, characterized in that, The first clamping block includes a first clamping plate portion, on which the first clamping opening is formed. The second clamping block includes a second clamping plate portion, on which the second clamping opening is formed. Both the first clamping plate portion and the second clamping plate portion are parallel to the first direction. The first clamping plate portion and the second clamping plate portion are used to stack in a second direction, which is perpendicular to the first direction.
5. The pipe cantilever bending fixture according to claim 4, characterized in that, The first clamping block includes a plurality of first clamping plate portions arranged in the second direction, and the second clamping block includes a plurality of second clamping plate portions arranged in the second direction, wherein each first clamping plate portion and each second clamping plate portion is arranged alternately in the second direction.
6. The pipe cantilever bending fixture according to claim 4, characterized in that, The device includes two clamping block connectors. The first clamping block further includes a first connecting seat portion, and a first clamping plate portion is fixed to the first connecting seat portion. The second clamping block further includes a second connecting seat portion, and the second clamping plate portion is fixed to the second connecting seat portion. Both the first connecting seat portion and the second connecting seat portion are connected to the two clamping block connectors. In a third direction, the two clamping block connectors are located on opposite sides of the first clamping block, and in the third direction, the two clamping block connectors are located on opposite sides of the second clamping block, and the first direction, the second direction, and the third direction are perpendicular to each other.
7. The pipe cantilever bending fixture according to claim 6, characterized in that, Two connecting through holes are formed on the second connecting seat, and two threaded through holes are formed on the first connecting seat. The clamping block connector includes a screw part and a limiting end fixed to one end of the screw part. The two screw parts pass through the two connecting through holes one by one and cooperate with the two threaded through holes one by one. The limiting end is located on the side of the second connecting seat away from the first clamping block.
8. The pipe cantilever bending fixture according to any one of claims 1 to 7, characterized in that, It also includes a rod-shaped clamping member, one end of which is mounted on the second clamping block, and the rod-shaped clamping member is used for clamping by the fixtures of the universal testing machine.
9. The pipe cantilever bending fixture according to claim 8, characterized in that, The rod-shaped clamping member is movably connected to the second clamping block.
10. The pipe cantilever bending fixture according to claim 9, characterized in that, It also includes a connecting bolt, the rod-shaped clamping member and the second clamping block are pivotally connected by the connecting bolt, the rod-shaped clamping member and the second clamping block are detachably connected by the connecting bolt, and the axial direction of the connecting bolt is perpendicular to the axial direction of the pipe to be tested.