Fatigue life testing device for pipe

Abstract

The invention relates to the technical field of testing devices, and provides a fatigue life testing device for a pipe, the fatigue life testing device comprises a vibration table, a first connecting mechanism and a second connecting mechanism, the vibration table comprises a base and a working platform, and the vibration table enables the working platform to at least output disturbance force of which the amplitude changes randomly; the first connecting mechanism is arranged on the working platform, and the first connecting mechanism is connected with the first end of the pipe to be tested; the second connecting mechanism is arranged on the base and connected with the second end of the pipe to be tested. Through the arrangement, the to-be-tested pipe is connected through the first connecting mechanism and the second connecting mechanism, the vibrating table can be used for applying disturbing force within a preset amplitude range to the to-be-tested pipe, and the amplitude of the disturbing force randomly changes within the preset amplitude range; therefore, the fatigue stress suffered by the pipe to be tested in the rocket launching process can be effectively simulated, and the fatigue life of the pipe for connecting the two parts of the spatial load in the rocket launching process can be accurately measured.

Description

Technical Field

[0001] The present invention relates to the technical field of testing devices, and particularly to a fatigue life testing device for pipe materials. Background Art

[0002] In the aerospace field, due to the vibration during the rocket launch process for a certain period of time, all space payloads carried by the rocket need to have the ability to withstand this random vibration without damage. Therefore, during the development process of space payloads, corresponding mechanical vibration tests need to be carried out for the space payloads. In some space payloads, due to the complex structure itself, the mechanical responses of different components vary greatly, resulting in a large relative displacement between different components. The pipe material connecting the two components will bear this displacement and cannot be damaged. This ability to resist displacement without damage is the fatigue resistance. Fatigue refers to the development process in which a certain point or some points of a material bear disturbing stresses, and after a sufficient number of cyclic disturbances, cracks are formed or complete fracture occurs. The resulting local permanent structural change is called fatigue, and fatigue is the main cause of the failure of engineering structures and components.

[0003] In the prior art, the devices for fatigue testing can only apply disturbing forces with a constant amplitude to the parts to be tested. However, the disturbing forces during the rocket launch process are random disturbing forces with variable amplitudes. Using the fatigue testing devices in the prior art cannot effectively reflect the fatigue stresses experienced by the pipe materials connecting the two components of the space payload during the rocket launch process, and cannot accurately measure the fatigue life of the pipe materials during the rocket launch process.

[0004] Therefore, how to accurately measure the fatigue life of the pipe materials connecting the two components of the space payload during the rocket launch process is an important issue that the industry urgently needs to solve at present. Summary of the Invention

[0005] The present invention provides a fatigue life testing device for pipe materials, which is used to accurately measure the fatigue life of the pipe materials connecting the two components of the space payload during the rocket launch process.

[0006] The present invention provides a fatigue life testing device for pipe materials, including:

[0007] A vibration table, including a base and a working platform, the vibration table is adapted to make the working platform output at least disturbing forces with randomly varying amplitudes;

[0008] A first connection mechanism, arranged on the working platform, the first connection mechanism is adapted to be connected to the first end of the pipe material to be tested;

[0009] A second connection mechanism, arranged on the base, the second connection mechanism is adapted to be connected to the second end of the pipe material to be tested.

[0010] A fatigue life test device for pipe according to the present invention, the first connection mechanism includes:

[0011] A first fixing block is arranged on the working platform, and a first connecting column is arranged on the first fixing block;

[0012] A first connecting member, the first end of the first connecting member is threadedly connected to the first connecting column, the second end of the first connecting member is rotatably sleeved outside the first end of the pipe to be tested, and a first limiting structure is arranged between the second end of the first connecting member and the first end of the pipe to be tested, and the first limiting structure is adapted to limit the pipe to be tested away from the first connecting member.

[0013] A fatigue life test device for pipe according to the present invention, the first limiting structure includes:

[0014] A first outer flange is arranged outside the first end of the pipe to be tested;

[0015] A first inner flange is arranged inside the second end of the first connecting member, and one side of the first inner flange close to the first end of the first connecting member is adapted to abut against one side of the first outer flange close to the second end of the pipe to be tested.

[0016] A fatigue life test device for pipe according to the present invention, the first fixing block is connected to the working platform by a first bolt, and a first connection hole for the first bolt to pass through is arranged on the first fixing block;

[0017] At least two groups of first threaded holes are arranged on the working platform, each group of first threaded holes are spaced apart along a first direction, and each group of first threaded holes are spaced apart along a second direction, the first direction is parallel to the direction of the disturbing force, the second direction is parallel to the working platform, and the second direction is perpendicular to the first direction;

[0018] The first bolt can be adapted to any one of the first threaded holes.

[0019] A fatigue life test device for pipe according to the present invention, the second connection mechanism includes:

[0020] A support frame is fixedly arranged on the base, and the support frame is located on one side of the first connection mechanism along the direction of the disturbing force;

[0021] A second fixing block is arranged on the support frame, and a second connecting column is arranged on the second fixing block;

[0022] A second connecting member, the first end of the second connecting member is threadedly connected to the second connecting column, the second end of the second connecting member is rotatably sleeved outside the second end of the pipe to be tested, and a second limiting structure is provided between the second end of the second connecting member and the second end of the pipe to be tested, and the second limiting structure is adapted to limit the pipe to be tested away from the second connecting member.

[0023] A fatigue life test device for pipes according to the present invention, the support frame includes:

[0024] Columns, there are a pair of them, the axis of the columns is perpendicular to the working platform, and the distribution direction of the columns is perpendicular to the direction of the disturbing force;

[0025] A cross beam is arranged between a pair of the columns, both ends of the cross beam are respectively connected to a pair of the columns, and the second fixing block is arranged on the cross beam.

[0026] A fatigue life test device for pipes according to the present invention, a pair of clamping arms are arranged at the end of the cross beam, an accommodating space for the column to pass through is formed between the pair of clamping arms, and there is a distance between the pair of clamping arms;

[0027] One ends of the pair of clamping arms away from the cross beam are detachably connected together by a third bolt.

[0028] A fatigue life test device for pipes according to the present invention, the second fixing block is connected to the cross beam by a second bolt, and a second connection hole for the second bolt to pass through is provided on the second fixing block;

[0029] A second threaded hole is provided on the cross beam, and the second threaded hole is adapted to the second bolt.

[0030] A fatigue life test device for pipes according to the present invention, a plurality of the first fixing blocks and the second fixing blocks are both provided, an included angle exists between the axes of the first connection holes of any two of the first fixing blocks, and an included angle exists between the axes of the second connection holes of any two of the second fixing blocks.

[0031] A fatigue life test device for pipes according to the present invention, a plurality of the first connection holes are provided on the first fixing block, and an included angle exists between the axes of any two of the first connection holes;

[0032] A plurality of the second connection holes are provided on the second fixing block, and an included angle exists between the axes of any two of the second connection holes.

[0033] The fatigue life test device for pipes provided by the present invention includes a vibration table, a first connection mechanism, and a second connection mechanism. The vibration table includes a base and a working platform, and the working platform of the vibration table can output at least a disturbing force with a randomly varying amplitude. The amplitude range of the expected disturbing force (referred to as the preset amplitude range) can be set for the vibration table according to the amplitude of the disturbing force actually received by the pipe to be tested during rocket launch. When the vibration table operates, the working platform can output a disturbing force that randomly varies within the preset amplitude range. The first connection mechanism is arranged on the working platform and is used to connect with the first end of the pipe to be tested. The second connection mechanism is arranged on the base and is used to connect with the second end of the pipe to be tested. With such a setting, the pipe to be tested is connected through the first connection mechanism and the second connection mechanism, the second end of the pipe to be tested remains stationary, and a disturbing force within the preset amplitude range is applied to the first end of the pipe to be tested by the vibration table, and the amplitude of the disturbing force randomly varies within the preset amplitude range. Thus, the fatigue stress experienced by the pipe to be tested during rocket launch can be effectively simulated, and further, the fatigue life of the pipe connecting two components of the space load during rocket launch can be accurately measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 is a schematic structural diagram of the fatigue life test device for pipes provided by the present invention;

[0036] Figure 2 is a front view of the fatigue life test device for pipes provided by the present invention;

[0037] Figure 3 is Figure 2 the sectional view taken along line A-A in

[0038] Figure 4 is a top view of the fatigue life test device for pipes provided by the present invention;

[0039] Figure 5 is Figure 4 the sectional view taken along line B-B in

[0040] Reference numerals:

[0041] 1. Shaking table; 2. Base; 3. Working platform; 4. Pipe to be tested; 5. First fixing block; 6. First connecting column; 7. First connecting piece; 8. First limiting structure; 9. First bolt; 10. First threaded hole; 11. Second fixing block; 12. Second connecting piece; 13. Column; 14. Cross beam; 15. Clamping arm; 16. Third bolt; 17. Second bolt. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0043] The following Figures 1 to 5 describes the fatigue life test device for pipes of the present invention.

[0044] As Figures 1 to 5 shown, the fatigue life test device for pipes provided by the embodiment of the present invention includes a shaking table 1, a first connecting mechanism and a second connecting mechanism.

[0045] Specifically, the shaking table 1 is placed on the ground. The shaking table 1 includes a base 2 and a working platform 3. The working platform 3 of the shaking table 1 can at least output disturbing forces with randomly varying amplitudes.

[0046] The amplitude range of the expected disturbing force (referred to as the preset amplitude range) can be set for the shaking table 1 according to the amplitude of the disturbing force actually received by the pipe 4 to be tested during rocket launch. When the shaking table 1 operates, the working platform 3 can output disturbing forces that randomly vary within the preset amplitude range.

[0047] The first connecting mechanism is arranged on the working platform 3 and is used to connect with the first end of the pipe 4 to be tested.

[0048] The second connecting mechanism is arranged on the base 2 and is used to connect with the second end of the pipe 4 to be tested.

[0049] With such a setting, the fatigue life test device for pipes based on the shaking table 1 provided by the embodiments of the present invention connects the pipe 4 to be tested through the first connection mechanism and the second connection mechanism. The second end of the pipe 4 to be tested remains stationary, and the shaking table 1 is used to apply a disturbing force within a preset amplitude range to the first end of the pipe 4 to be tested, and the amplitude of the disturbing force randomly varies within the preset amplitude range. Thus, the fatigue stress experienced by the pipe 4 to be tested during the rocket launch process can be effectively simulated, and further, the fatigue life of the pipe for connecting two components of the space load during the rocket launch process can be accurately measured.

[0050] In the embodiments of the present invention, the first connection mechanism includes a first fixing block 5 and a first connecting member 7, and the first fixing block 5 is arranged on the working platform 3.

[0051] A first connecting column 6 is arranged on the first fixing block 5. The first end of the first connecting member 7 is threadedly connected to the first connecting column 6. The second end of the first connecting member 7 is rotatably sleeved outside the first end of the pipe 4 to be tested, and a first limiting structure 8 is arranged between the second end of the first connecting member 7 and the first end of the pipe 4 to be tested. The first limiting structure 8 can limit the pipe 4 to be tested from moving away from the first connecting member 7.

[0052] In this embodiment, the first limiting structure 8 includes a first outer flange and a first inner flange. The first outer flange is arranged outside the first end of the pipe 4 to be tested, and the first inner flange is arranged inside the second end of the first connecting member 7. Refer to Figure 5 , one side of the first inner flange close to the first end of the first connecting member 7 can abut against one side of the first outer flange close to the second end of the pipe 4 to be tested. Through the interaction between the first inner flange and the first outer flange, the pipe 4 to be tested can be restricted from moving away from the first connecting column 6 and the first connecting member 7.

[0053] Specifically, the first inner flange can be integrally connected to the first connecting member 7. For example, the first inner flange and the first connecting member 7 are integrally formed. The first outer flange on the pipe 4 to be tested is a post-processing. Specifically, the first connecting member 7 and the first inner flange can be sleeved outside the first end of the pipe 4 to be tested, and then the first outer flange is processed on the first end of the pipe 4 to be tested by welding.

[0054] In this embodiment, the first fixing block 5 is fixed to the working platform 3 by using a first bolt 9.

[0055] In a specific embodiment, a first threaded hole 10 is arranged on the working platform 3, and a first connecting hole is arranged on the first fixing block 5. The first connecting hole can allow the first bolt 9 to pass through. After the first bolt 9 passes through the first fixing block 5, the nut end of the first bolt 9 abuts against the first fixing block 5, and the first bolt 9 is threadedly connected to the first threaded hole 10 of the working platform 3.

[0056] There are at least two groups of the first threaded holes 10. To facilitate the description of the distribution of the first threaded holes 10, it is now stipulated that the direction parallel to the direction of the disturbing force is the first direction. Referring to Figure 1 the direction indicated by x in Figure 1 and parallel to the working platform 3, and the direction perpendicular to the first direction is the second direction. Referring to Figure 1 the direction indicated by y in

[0057] The first threaded holes 10 in each group are spaced along the first direction, and the first threaded holes 10 in each group are spaced along the second direction. That is to say, there are multiple first threaded holes 10, and the multiple first threaded holes 10 are arranged in rows and columns on the working platform 3.

[0058] The first bolt 9 can be adapted to any one of the first threaded holes 10. By connecting the first bolt 9 to different first threaded holes 10, the installation position of the first fixing block 5 on the working platform 3 can be adjusted, so as to adapt to the installation of the test pipe 4 with different distances between the two ends in the first direction and the second direction, that is, it can adapt to the installation of test pipes 4 with different shapes and sizes.

[0059] In the embodiment of the present invention, the second connection mechanism includes a support frame, a second fixing block 11 and a second connecting member 12.

[0060] The support frame is fixedly arranged on the base 2. Along the direction of the disturbing force, the support frame is located on one side of the first connection mechanism, and the second fixing block 11 is arranged on the support frame.

[0061] The second fixing block 11 is provided with a second connecting column. The first end of the second connecting member 12 is threadedly connected to the second connecting column. The second end of the second connecting member 12 is rotatably sleeved outside the second end of the test pipe 4. A second limiting structure is arranged between the second end of the second connecting member 12 and the second end of the test pipe 4, and the second limiting structure can limit the test pipe 4 from moving away from the second connecting member 12.

[0062] In this embodiment, the second limiting structure includes a second outer flange and a second inner flange. The second outer flange is arranged outside the second end of the test pipe 4, and the second inner flange is arranged inside the second end of the second connecting member 12. One side of the second inner flange close to the first end of the second connecting member 12 can abut against one side of the second outer flange close to the first end of the test pipe 4. Through the interaction between the second inner flange and the second outer flange, the test pipe 4 can be restricted from moving away from the second connecting column and the first connecting member 7.

[0063] Specifically, the second inner flange can be connected to the second connecting member 12 to form an integral structure. For example, the second inner flange and the second connecting member 12 are integrally formed. The second outer flange on the pipe to be tested 4 is a post-processing part. Specifically, the second connecting member 12 and the second inner flange can be sleeved on the outside of the second end of the pipe to be tested 4, and then the second outer flange can be processed at the second end of the pipe to be tested 4 by welding.

[0064] In the embodiment of the present invention, the support frame includes a column 13 and a cross beam 14.

[0065] There are a pair of columns 13. The axes of the pair of columns 13 are parallel to each other and are both perpendicular to the working platform 3. The distribution direction of the columns 13 is perpendicular to the direction of the disturbing force. That is, the axes of the columns 13 are parallel to the third direction, and the distribution direction of the pair of columns 13 is parallel to the second direction.

[0066] The cross beam 14 is arranged between the pair of columns 13. The axis of the cross beam 14 is parallel to the second direction. The two ends of the cross beam 14 are respectively connected to the pair of columns 13. The cross beam 14 and the pair of columns 13 together form the above-mentioned support frame, and the second fixing block 11 is arranged on the cross beam 14.

[0067] The support frame can be set in a structural form in which the cross beam 14 can move up and down relative to the working platform 3. By adjusting the height of the cross beam 14, the height of the second fixing block 11 can be correspondingly adjusted, so as to adapt to the installation of the pipe to be tested 4 with different distances in the third direction between its two ends. That is, it can adapt to the installation of pipes to be tested 4 with various shapes and sizes.

[0068] In a specific embodiment, a pair of clamping arms 15 are arranged at the end of the cross beam 14. An accommodating space for the column 13 to pass through is formed between the pair of clamping arms 15. The clamping arms 15 have a certain deformation ability. In the natural state, there is a spacing between the pair of clamping arms 15.

[0069] The pair of clamping arms 15 are detachably connected together at the end away from the cross beam 14 by using the third bolt 16 and the nut.

[0070] After the column 13 passes through between the pair of clamping arms 15, the third bolt 16 and the nut are screwed. Through the clamping action of the nut end of the third bolt 16 and the nut on the pair of clamping arms respectively, the distance between the pair of clamping arms 15 can be reduced, and the clamping force of the pair of clamping arms 15 on the column 13 and the frictional force between the pair of clamping arms 15 and the column 13 can be increased, so that the end of the cross beam 14 and the column 13 can be relatively fixed.

[0071] When it is necessary to adjust the position of the cross beam 14, turn the third bolt 16 and the nut to increase the distance between a pair of clamping arms 15, reduce the clamping force of the pair of clamping arms 15 on the column 13 and the frictional force between the pair of clamping arms 15 and the column 13, so that the end of the cross beam 14 can slide relative to the column 13.

[0072] On one side where the pair of clamping arms 15 are close to each other, a rubber pad is provided to increase the frictional force between the clamping arms 15 and the column 13, ensuring the stability of the relative position between the cross beam 14 and the column 13.

[0073] In this embodiment, the second fixing block 11 is connected to the cross beam 14 through the second bolt 17.

[0074] A second connection hole is provided on the second fixing block 11, and the second connection hole can allow the second bolt 17 to pass through. A second threaded hole is provided on the cross beam 14, and the second threaded hole is adapted to the second bolt 17. After the second bolt 17 passes through the second fixing block 11, the nut end of the second bolt 17 abuts against the second fixing block 11, and the second bolt 17 is threadedly connected to the second threaded hole of the cross beam 14.

[0075] In some embodiments, the installation position of the second fixing block 11 on the cross beam 14 is fixed. Specifically, the second fixing block 11 can be fixed at the middle position of the cross beam 14.

[0076] In other embodiments, the position of the second fixing block 11 on the cross beam 14 can be adjusted along the second direction, and the distance between the second fixing block 11 and the first fixing block 5 along the second direction can be further adjusted to improve the adaptability to the test pipe 4 with different distances between the two ends in the second direction.

[0077] Specifically, a plurality of second threaded holes are provided on the cross beam 14, and the plurality of second threaded holes are spaced apart along the second direction. The second bolt 17 can be adapted to any one of the second threaded holes. By connecting the second bolt 17 to different second threaded holes, the installation position of the second fixing block 11 on the cross beam 14 can be adjusted.

[0078] In some embodiments, a plurality of first connection holes are provided on the first fixing block 5, and an included angle exists between the axes of any two first connection holes. When connecting different first connection holes to the first threaded holes 10 on the working platform 3, the axial directions of the first connection columns 6 on the first fixing block 5 are different, that is, the installation postures of the first fixing block 5 on the working platform 3 are different, and test pipes 4 with different extending directions at the first end can be connected.

[0079] A plurality of second connection holes are provided on the second fixed block 11, and an included angle exists between the axes of any two second connection holes. When different second connection holes are connected to the second threaded holes on the cross beam 14, the axial directions of the second connection columns on the second fixed block 11 are different, that is, the installation postures of the second fixed block 11 on the cross beam 14 are different, and the test pipes 4 with different extension directions at the second end can be connected.

[0080] By comprehensively adjusting the installation posture of the first fixed block 5 on the workbench 3 and the installation posture of the second fixed block 11 on the cross beam 14, the installation posture of the test pipe 4 on the vibration table 1 can be adjusted, so that the fatigue life of the test pipe 4 in the first direction, the second direction and the third direction can be measured.

[0081] In some other embodiments, the first connection mechanism includes a plurality of first fixed blocks 5, and an included angle exists between the axes of the first connection holes of any two first fixed blocks 5. When different first fixed blocks 5 are connected to the first threaded holes 10 on the workbench 3, the axial directions of the first connection columns 6 on different first fixed blocks 5 are different, and the installation postures of different first fixed blocks 5 on the workbench 3 are different, and the test pipes 4 with different extension directions at the first end can be connected.

[0082] The second connection mechanism includes a plurality of second fixed blocks 11, and an included angle exists between the axes of the second connection holes of any two second fixed blocks 11. When different second fixed blocks 11 are connected to the second threaded holes on the cross beam 14, the axial directions of the second connection columns on different second fixed blocks 11 are different, and the installation postures of different second fixed blocks 11 on the cross beam 14 are different, and the test pipes 4 with different extension directions at the second end can be connected.

[0083] By replacing different first fixed blocks 5 and second fixed blocks 11, the installation posture of the test pipe 4 on the vibration table 1 can be adjusted, so that the fatigue life of the test pipe 4 in the first direction, the second direction and the third direction can be measured.

[0084] In summary, the fatigue life test device for pipes provided by the embodiments of the present invention can measure the fatigue life of test pipes 4 with different shapes and sizes in the first direction, the second direction and the third direction by adjusting the installation position and installation posture of the first fixed block 5 on the workbench 3, the installation position of the cross beam 14 on the column 13, and the installation position and installation posture of the second fixed block 11 on the cross beam 14.

[0085] Moreover, through a large number of tests and use, it is proved that the fatigue life test device for pipes provided by the embodiments of the present invention is practical and effective, and the accuracy of the measurement results is relatively high.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fatigue life test device for pipe materials, characterized in that, Comprising: A shaking table, including a base and a working platform, the shaking table being adapted to cause the working platform to output at least a disturbing force with randomly varying amplitude; A first connecting mechanism, arranged on the working platform, the first connecting mechanism being adapted to be connected to the first end of the pipe to be tested; A second connecting mechanism, arranged on the base, the second connecting mechanism being adapted to be connected to the second end of the pipe to be tested.

2. The fatigue life test device for pipe materials according to claim 1, characterized in that The first connecting mechanism includes: A first fixing block, arranged on the working platform, and a first connecting column is arranged on the first fixing block; A first connecting member, the first end of the first connecting member is threadedly connected to the first connecting column, the second end of the first connecting member is rotatably sleeved outside the first end of the pipe to be tested, and a first limiting structure is arranged between the second end of the first connecting member and the first end of the pipe to be tested, the first limiting structure being adapted to limit the pipe to be tested away from the first connecting member.

3. The fatigue life test device for pipe materials according to claim 2, characterized in that, The first limiting structure includes: A first outer flange, arranged outside the first end of the pipe to be tested; A first inner flange, arranged inside the second end of the first connecting member, and one side of the first inner flange close to the first end of the first connecting member is adapted to abut against one side of the first outer flange close to the second end of the pipe to be tested.

4. The fatigue life testing device for pipe materials according to claim 2, characterized in that, The first fixing block is connected to the working platform by a first bolt, and a first connecting hole for the first bolt to pass through is arranged on the first fixing block; At least two groups of first threaded holes are arranged on the working platform, each group of first threaded holes are spaced apart along a first direction, and each group of first threaded holes are spaced apart along a second direction, the first direction is parallel to the direction of the disturbing force, the second direction is parallel to the working platform, and the second direction is perpendicular to the first direction; The first bolt can be adapted to any one of the first threaded holes.

5. The fatigue life test device for pipe materials according to claim 4, characterized in that, The second connecting mechanism includes: A support frame, fixedly arranged on the base, and the support frame is located on one side of the first connecting mechanism along the direction of the disturbing force; A second fixing block, arranged on the support frame, and a second connecting column is arranged on the second fixing block; A second connecting member, the first end of the second connecting member is threadedly connected to the second connecting column, the second end of the second connecting member is rotatably sleeved outside the second end of the pipe to be tested, and a second limiting structure is arranged between the second end of the second connecting member and the second end of the pipe to be tested, the second limiting structure being adapted to limit the pipe to be tested away from the second connecting member.

6. The fatigue life test device for pipe materials according to claim 5, characterized in that, The support frame includes: A pair of columns, the axes of the columns are perpendicular to the working platform, and the distribution direction of the columns is perpendicular to the direction of the disturbing force; A cross beam, arranged between the pair of columns, both ends of the cross beam are respectively connected to the pair of columns, and the second fixing block is arranged on the cross beam.

7. The fatigue life test device for pipe materials according to claim 6, characterized in that, A pair of clamping arms are arranged at the end of the cross beam, and an accommodation space for the column to pass through is formed between the pair of clamping arms, and there is a spacing between the pair of clamping arms; One ends of the pair of clamping arms away from the cross beam are detachably connected together by a third bolt.

8. The fatigue life testing device for pipe materials according to claim 6, characterized in that, The second fixing block is connected to the cross beam by a second bolt, and a second connection hole for the second bolt to pass through is provided on the second fixing block; A second threaded hole is provided on the cross beam, and the second threaded hole is adapted to the second bolt.

9. The fatigue life test device for pipe materials according to claim 8, characterized in that, A plurality of the first fixing blocks and the second fixing blocks are provided. An included angle exists between the axes of the first connection holes of any two of the first fixing blocks, and an included angle exists between the axes of the second connection holes of any two of the second fixing blocks.

10. The fatigue life test device for pipe materials according to claim 8, characterized in that, A plurality of the first connection holes are provided on the first fixing block, and an included angle exists between the axes of any two of the first connection holes; A plurality of the second connection holes are provided on the second fixing block, and an included angle exists between the axes of any two of the second connection holes.

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