A metal material fatigue resistance detection device

Abstract

The present invention discloses a device for testing the fatigue resistance of metal materials. The present invention relates to the field of fatigue resistance testing technology and includes a bender, a stretcher, and a clamp. The bender is fixedly mounted on the top of the stretcher, and the clamp is arranged on the opposite sides of the bender and the stretcher. The bender includes a folding plate, the bottom end of which is fixedly connected to the stretcher, and the top of the folding plate is respectively fixedly connected to a hydraulic rod and a chuck. The end of the hydraulic rod away from the folding plate is fixedly connected to an extrusion plate, and the top of the chuck is sleeved with a threaded rod. The device for testing the fatigue resistance of metal materials has a circular groove at the bottom of the rotating gear, and the inner side of the circular groove is slidably mounted with a sleeve. In addition, the bottom of the sleeve is fixedly connected to the clamp, so that the clamp will move downward and clamp the metal material placed above the side plate to fix the metal material.

Description

Technical Field

[0001] The present invention relates to the technical field of fatigue resistance detection, in particular to a metal material fatigue resistance detection device. Background Art

[0002] Metal fatigue refers to the process by which materials and components, under cyclic stress or cyclic strain, gradually develop localized permanent cumulative damage in one or more locations, leading to cracks or sudden complete fracture after a certain number of cycles. When materials and structures are subjected to repeatedly changing loads, even if the stress value never exceeds the material's strength limit, or even falls below its elastic limit, failure may occur. This phenomenon of material and structure damage under repeated alternating loads is called metal fatigue failure.

[0003] Existing fatigue testing equipment can only perform unilateral fatigue testing on a metal material. In addition, the metal material needs to be fixed between tests. Sometimes the metal material will fall off under the drive of the motor or other external forces, thereby affecting the continuity of the fatigue testing. Summary of the Invention

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A metal material fatigue resistance testing device includes a bender, a stretcher, and a clamp, wherein the bender is fixedly mounted on the top of the stretcher, and the clamp is arranged on the opposite sides of the bender and the stretcher;

[0005] The bender includes a folding plate, the bottom end of the folding plate is fixedly connected to the stretcher, the top of the folding plate is fixedly connected to a hydraulic rod and a chuck respectively, the end of the hydraulic rod away from the folding plate is fixedly connected to an extrusion plate, and the top of the chuck is sleeved with a threaded rod; when the hydraulic rod moves upward and the metal material arranged above it is squeezed upward by the extrusion plate, it plays a role in detecting the bending fatigue degree of the metal material.

[0006] The stretcher includes a shaft seat, the top end of which is fixedly connected to the folding plate, a screw rod is rotatably mounted on the inner side of the shaft seat, and a stretching assembly is threadedly connected to the outer side of the screw rod;

[0007] The clamp includes a support frame, the outer side of the support frame is fixedly connected to a rib plate, a driving rod is provided on the side of the support frame away from the rib plate, the bottom end and the outer side of the driving rod are both threadedly connected to a limit block, the end face of the limit block is fixedly connected to the support frame, and a driver is sleeved on the outer side of the driving rod, and the driver is arranged above the limit block;

[0008] A forked plate is threadedly connected to the central portion of the outer side of the driving rod. The forked plate is arranged between the two limit blocks. A clamping assembly is fixedly mounted on the surface of the forked plate.

[0009] Preferably, the stretching assembly includes a slider, which is threadedly connected to the screw rod. External blocks are fixedly connected to both ends of the slider. A U-shaped bracket is fixedly connected to the end face of the external block. A vertical rod is fixedly connected to the inner side of the U-shaped bracket. A stacked plate is slidably mounted on the outer side of the vertical rod. A clamping block is inserted into the surface of the stacked plate, and a clamping plate is fixedly connected to the bottom of the clamping block. The clamping block is inserted into the stacked plate, so the size of the clamping plate can be changed to clamp different types of metal materials. The stacked plate is slidably mounted on the vertical rod, thereby clamping one end of the metal material.

[0010] Preferably, the driver includes an outer frame, the bottom of which is fixedly connected to a limit block, a free rod rotatably mounted on the outer side of the outer frame, the outer end of which is fixedly connected to a turning handle, an inner frame fixedly mounted on the inner side of the outer frame, the inner frame sleeved on the outer side of the driving rod, and the top of the driving rod fixedly connected to a turning block. When the turning handle is rotated forward, the free rod fixed to the inner end of the turning handle rotates accordingly, and then the free rod passes through the inner frame to squeeze the driving rod, thereby fixing the driving rod and preventing the position of the clamping assembly from moving again.

[0011] Preferably, the clamping assembly includes a support block, the outer side of the support block is fixedly connected to the bifurcation plate, the surface of the support block is fixedly connected to a side plate, and a clamping plate is provided above the side plate.

[0012] Preferably, a sleeve is fixedly connected to the top of the clamping plate, and a rotating tooth is provided at the end of the sleeve away from the clamping plate. The bottom of the rotating tooth is provided with a circular groove, and the sleeve is slidably mounted inside the circular groove. The bottom of the rotating tooth is provided with a circular groove, and the inner side of the circular groove is slidably mounted on the sleeve. In addition, the bottom of the sleeve is fixedly connected to the clamping plate, so that the clamping plate will move downward and clamp the metal material placed above the side plate to fix the metal material.

[0013] Preferably, the bottom of the rotating tooth is fixedly connected to a central shaft, the bottom of the central shaft is fixedly connected to a lower clamp, the central shaft is threadedly connected to the support block, and a fixer is inserted into the interior of the support block.

[0014] Preferably, the holder includes a tooth plate, the outer side of which is inserted into the interior of the support block, the bottom of which is fixedly connected to a fluctuating plate, the interior of the support block being provided with an oblique groove, and a retaining rod being slidably mounted within the oblique groove. As the fluctuating plate moves downward, it continuously presses the retaining rod slidably mounted within the oblique groove, and the retaining rod then slides downward along the oblique groove and compresses and secures the outer side of the central shaft, thereby preventing the central shaft from rotating due to vibration, thereby loosening the clamping plates and side plates that clamp the metal material.

[0015] Preferably, the lower clamp includes a No. 1 sleeve, the inner side of which is fixedly connected to the center shaft, the outer side of which is rotatably mounted with a deflection frame, the inner side of which is fixedly connected to an extension plate, the bottom of which is fixedly connected to a spring, and the end of the spring away from the extension plate is fixedly connected to a sliding plate.

[0016] Preferably, the outer side of the No. 1 shaft sleeve is fixedly connected to the No. 2 shaft sleeve, the inner side of the No. 2 shaft sleeve is slidably connected to the sliding plate, the bottom of the sliding plate is fixedly connected to the lower pressure frame, the bottom of the lower pressure frame is slidably connected to the lower clamping assembly, the inner side of the lower clamping assembly is fixedly connected to the No. 2 shaft sleeve, and an insertion rod is inserted into the top of the lower clamping assembly.

[0017] Preferably, the lower clamping assembly includes a bottom shell, the inner side of which is fixedly connected to the second shaft sleeve, the bottom of which is fixedly connected to a support, a push rod slidably mounted inside the support, and a clamping block fixedly connected to the end face of the push rod. The clamping block and the sleeve block are both slidably mounted below the lower pressing frame, so that the downward movement of the clamping block and the sleeve block achieves a clamping effect on the periphery of the metal material, and then pushes the push rod inward, thereby fixing the metal material.

[0018] Preferably, the top of the clamping block is slidably connected to the lower pressing frame, and a soft pad is fixedly connected to the side of the clamping block away from the push rod. A sleeve block is slidably mounted inside the lower pressing frame, and the interior of the sleeve block is sleeved onto the outside of the insertion rod. The other end of the metal material below is placed inside the sleeve block, and both sides of the metal material are clamped by the clamping block. The inner side of the clamping block is fixedly connected to a soft pad, and the soft pad can be freely changed to achieve the clamping effect of different metal materials.

[0019] The present invention provides a device for detecting fatigue resistance of metal materials. It has the following beneficial effects:

[0020] 1. The metal material fatigue resistance testing device has a circular groove at the bottom of the rotating tooth, and the inner side of the circular groove is slidably installed with the sleeve. In addition, the bottom of the sleeve is fixedly connected to the clamping plate, so the clamping plate will move downward and clamp the metal material placed above the side plate to fix the metal material.

[0021] 2. The metal material fatigue resistance detection device moves the hydraulic rod upward when both ends of the metal material are fixed, wherein the top end of the hydraulic rod is fixedly connected to the extrusion plate. Therefore, the metal material arranged above the extrusion plate will be squeezed upward by the extrusion plate, thereby playing the role of detecting the bending fatigue degree of the metal material.

[0022] Third, the metal material fatigue resistance testing device places one end of the metal material on a clamping plate, wherein the surface of the clamping plate is connected to the clamping block, which is inserted into the stacking plate. Therefore, the size of the clamping plate is interchangeable to play the role of clamping different types of metal materials. The stacking plate is slidably mounted on the vertical rod, thereby playing the role of clamping one end of the metal material.

[0023] 4. The metal material fatigue resistance testing device realizes the clamping effect on the periphery of the metal material by the downward movement of the lower pressure frame, wherein the clamping block and the sleeve block are both slidably installed under the lower pressure frame. Therefore, the downward movement of the clamping block and the sleeve block realizes the clamping effect on the periphery of the metal material, and then pushes the push rod inward to fix the metal material.

[0024] 5. The metal material fatigue resistance testing device, when the metal materials at both ends are fixed, slides the slider outward along the screw rod. At this time, the fixed metal material will be pulled in a single direction, so as to play the role of testing the ductility of the metal material. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the external structure of a metal material fatigue resistance detection device according to the present invention;

[0026] Figure 2 This is a schematic structural diagram of the bender of the present invention;

[0027] Figure 3 This is a schematic structural diagram of the stretching assembly of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the clamp of the present invention;

[0029] Figure 5 This is a schematic diagram of the cross-sectional structure of the driver of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the clamping assembly of the present invention;

[0031] Figure 7 Schematic diagram of the cross-sectional structure of the fixator of the present invention;

[0032] Figure 8 This is a schematic cross-sectional structural diagram of the lower card device of the present invention;

[0033] Figure 9 This is a structural diagram of the lower card assembly of the present invention.

[0034] In the figure: 1, bender; 2, stretcher; 3, clamp; 11, folding plate; 12, hydraulic rod; 13, extrusion plate; 14, chuck; 15, threaded rod; 21, shaft seat; 22, screw rod; 23, stretching assembly; 231, slider; 232, external block; 233, U-shaped bracket; 234, vertical rod; 235, stacked plate; 236, clamping block; 237, clamping plate; 31, support frame; 32, rib plate; 33, driving rod; 34, limit block; 35, driver; 36, fork plate; 37, clamping assembly; 351, outer frame; 352, turning handle; 353, free rod; 354, inner frame; 355, rotating block; 371, support block; 37 2. Side plate; 373. Center axis; 374. Rotating gear; 375. Clamp; 376. Fixer; 377. Lower clamp; 378. Circular groove; 379. Sleeve; 3761. Tooth plate; 3762. Fluctuating plate; 3763. Oblique groove; 3764. Push rod; 3771. No. 1 bushing; 3772. Deflection frame; 3773. Extension plate; 3774. Spring; 3775. Sliding plate; 3776. No. 2 bushing; 3777. Lower pressure frame; 3778. Insert rod; 3779. Lower clamp assembly; 7791. Bottom shell; 7792. Support; 7793. Push rod; 7794. Clamping block; 7795. Cushion; 7796. Bushing block. DETAILED DESCRIPTION

[0035] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described to better illustrate the principles of the invention and its practical application, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for specific applications.

[0036] The first embodiment, as Figure 1-Figure 3 As shown, the present invention provides a technical solution: a metal material fatigue resistance detection device, comprising a bender 1, a stretcher 2 and a clamp 3, wherein the bender 1 is fixedly mounted on the top of the stretcher 2, and the clamp 3 is arranged on the opposite sides of the bender 1 and the stretcher 2.

[0037] The bender 1 includes a folding plate 11, the bottom end of which is fixedly connected to the stretcher 2. A hydraulic rod 12 and a chuck 14 are fixedly connected to the top of the folding plate 11. The end of the hydraulic rod 12 away from the folding plate 11 is fixedly connected to an extrusion plate 13, and a threaded rod 15 is sleeved on the top of the chuck 14. When both ends of the metal material are fixed, the hydraulic rod 12 is moved upward, with the top end of the hydraulic rod 12 fixedly connected to the extrusion plate 13. As a result, the metal material positioned above the extrusion plate 13 is squeezed upward by the extrusion plate 13, thereby detecting the bending fatigue degree of the metal material.

[0038] The stretcher 2 includes a shaft seat 21 , the top end of which is fixedly connected to the folding plate 11 , a screw rod 22 is rotatably mounted on the inner side of the shaft seat 21 , and a stretching assembly 23 is threadedly connected to the outer side of the screw rod 22 .

[0039] The stretching assembly 23 includes a slider 231, which is threadedly connected to the screw rod 22. External blocks 232 are fixedly connected to each end of the slider 231. A U-shaped bracket 233 is fixedly connected to the end face of the external block 232. A vertical rod 234 is fixedly connected to the inner side of the U-shaped bracket 233. A stacking plate 235 is slidably mounted on the outer side of the vertical rod 234. A clamping block 236 is inserted into the surface of the stacking plate 235, and a clamping plate 237 is fixedly connected to the bottom of the clamping block 236. Another piece of metal material is placed on the clamping plate 237. The surface of the clamping plate 237 is connected to the clamping block 236, which is inserted into the stacking plate 235. Therefore, the size of the clamping plate 237 can be changed to clamp different types of metal materials. The stacking plate 235 is slidably mounted on the vertical rod 234, thereby clamping one end of the metal material.

[0040] After the metal materials at both ends are fixed, the slider 231 is slid outward along the screw rod 22. At this time, the fixed metal materials will be pulled in one direction, so as to detect the ductility of the metal materials.

[0041] The second embodiment, as Figure 4-Figure 9As shown, the clamper 3 includes a support frame 31, and the outer side of the support frame 31 is fixedly connected to a rib plate 32, and a driving rod 33 is provided on the side of the support frame 31 away from the rib plate 32. The bottom end and the outer side of the driving rod 33 are both threadedly connected to a limit block 34, and the end face of the limit block 34 is fixedly connected to the support frame 31. The outer side of the driving rod 33 is sleeved with a driver 35, and the driver 35 is arranged above the limit block 34. The center part of the outer side of the driving rod 33 is threadedly connected to a fork plate 36, and the fork plate 36 is arranged at a position between the two limit blocks 34. The surface of the fork plate 36 is fixedly installed with a clamping assembly 37.

[0042] The driver 35 includes an outer frame 351, the bottom of which is fixedly connected to the limit block 34, a free rod 353 is rotatably installed on the outer side of the outer frame 351, the outer end of the free rod 353 is fixedly connected to the turning handle 352, an inner frame 354 is fixedly installed inside the outer frame 351, the inner frame 354 is sleeved on the outer side of the driving rod 33, and the top of the driving rod 33 is fixedly connected to the rotating block 355. By rotating the rotating block 355 forward, the driving rod 33 fixed at its bottom will rotate, and the fork plate 36 threadedly connected to the driving rod 33 will move downward, driving the clamping assembly 37 to adjust its position. When the position of the clamping assembly 37 is determined, the turning handle 352 is rotated forward, and the free rod 353 fixed on the inner end of the turning handle 352 will rotate accordingly. Then the free rod 353 will pass through the inner frame 354 to squeeze the driving rod 33, thereby fixing the driving rod 33 and preventing the position of the clamping assembly 37 from moving again.

[0043] The clamping assembly 37 includes a support block 371, the outer side of the support block 371 is fixedly connected to the fork plate 36, the surface of the support block 371 is fixedly connected to the side plate 372, a splint 375 is provided above the side plate 372, the top of the splint 375 is fixedly connected to a sleeve 379, the end of the sleeve 379 away from the splint 375 is provided with a rotating tooth 374, the bottom of the rotating tooth 374 is provided with a circular groove 378, the sleeve 379 is slidably installed inside the circular groove 378, the bottom of the rotating tooth 374 is fixedly connected to the center shaft 373, the bottom of the center shaft 373 is fixedly connected to the lower clamp 377, the center shaft 373 is threadedly connected to the support block 371, and a fixer 376 is inserted into the interior of the support block 371. One end of the metal material is placed inside the chuck 14, and then the threaded rod 15 is rotated downward to fix the metal material. The other end of the metal material is placed between the side plate 372 and the clamping plate 375. Before that, the metal material is above the extrusion plate 13. Then, the rotating gear 374 is rotated forward so that the center axis 373 fixedly connected to the rotating gear 374 will be threaded downward inside the support block 371. The bottom of the rotating gear 374 is provided with a circular groove 378, and the inner side of the circular groove 378 is slidably installed with the sleeve 379. In addition, the bottom of the sleeve 379 is fixedly connected to the clamping plate 375, so the clamping plate 375 will move downward and clamp the metal material placed above the side plate 372 to fix the metal material.

[0044] The fixer 376 includes a tooth plate 3761, the outer side of the tooth plate 3761 is inserted into the interior of the support block 371, the bottom of the tooth plate 3761 is fixedly connected to a wave plate 3762, the interior of the support block 371 is provided with an oblique groove 3763, and the interior of the oblique groove 3763 is slidably installed with a support rod 3764. When the clamping plate 375 and the side plate 372 clamp the metal material, the tooth plate 3761 moves downward, and the fluctuating plate 3762 fixed at the bottom of the tooth plate 3761 will move downward accordingly. The cross-sectional area of ​​the fluctuating plate 3762 increases from bottom to top. Therefore, as the fluctuating plate 3762 moves downward, it will continuously squeeze the supporting rod 3764 slidingly installed in the oblique groove 3763. At this time, the supporting rod 3764 will slide downward along the oblique groove 3763 and squeeze and fix the outer side of the central shaft 373 to prevent the central shaft 373 from rotating due to vibration, thereby causing the clamping plate 375 and the side plate 372 that clamp the metal material to loosen.

[0045] The lower clamp 377 includes a No. 1 shaft sleeve 3771, the inner side of which is fixedly connected to the central shaft 373, a deflection frame 3772 is rotatably mounted on the outer side of the No. 1 shaft sleeve 3771, an extension plate 3773 is fixedly connected to the inner side of the deflection frame 3772, a spring 3774 is fixedly connected to the bottom of the extension plate 3773, and a sliding plate 3775 is fixedly connected to the end of the spring 3774 away from the extension plate 3773. The outer side of the No. 1 shaft sleeve 3771 is fixedly connected to the No. 2 shaft sleeve 3776, the inner side of the No. 2 shaft sleeve 3776 is slidably connected to the sliding plate 3775, the bottom of the sliding plate 3775 is fixedly connected to the lower pressure frame 3777, the bottom of the lower pressure frame 3777 is slidably connected to the lower clamping assembly 3779, the inner side of the lower clamping assembly 3779 is fixedly connected to the No. 2 shaft sleeve 3776, and the top of the lower clamping assembly 3779 is inserted with an insertion rod 3778.

[0046] The lower clamping assembly 3779 includes a bottom shell 7791, the inner side of which is fixedly connected to the No. 2 shaft sleeve 3776, the bottom of the bottom shell 7791 is fixedly connected to a support 7792, a push rod 7793 is slidably installed inside the support 7792, the end face of the push rod 7793 is fixedly connected to a clamping block 7794, the top of the clamping block 7794 is slidably connected to the lower pressure frame 3777, the side of the clamping block 7794 away from the push rod 7793 is fixedly connected to a soft pad 7795, the inner part of the lower pressure frame 3777 is slidably installed with a sleeve block 7796, and the inner part of the sleeve block 7796 is sleeved on the outer side of the insertion rod 3778. The other end of the metal material at the bottom is placed inside the sleeve block 7796, and the two sides of the metal material are clamped by the clamping block 7794, wherein the inner side of the clamping block 7794 is fixedly connected with a soft pad 7795, and the soft pad 7795 can be changed at will to clamp different metal materials. Then, the deflection frame 3772 is rotated to rotate the extension disk 3773 fixed on the inner side thereof, and the spring 3774 fixed at the bottom thereof is stretched and lengthened, thereby fixing the spring 3774 on the other side. The sliding plate 3775 on one end will slide downward along the inner side of the No. 2 shaft sleeve 3776, and the bottom of the sliding plate 3775 is fixedly connected to the lower pressure frame 3777, so the lower pressure frame 3777 will move downward, and the clamping block 7794 and the sleeve block 7796 are both slidably installed under the lower pressure frame 3777. Therefore, the clamping block 7794 and the sleeve block 7796 move downward to achieve the clamping effect on the periphery of the metal material, and then push the push rod 7793 inward, thereby fixing the metal material.

[0047] The clamping assembly 37 is used to fine-tune the position and fix the metal material, while the overall large-scale adjustment is performed by the driver 35.

[0048] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. A metal material fatigue resistance testing device, comprising a bender (1), a stretcher (2) and a clamp (3), characterized in that: The bender (1) is fixedly mounted on the top of the stretcher (2), and the clamp (3) is arranged on opposite sides of the bender (1) and the stretcher (2); The bender (1) comprises a folding plate (11), the bottom end of the folding plate (11) is fixedly connected to the stretcher (2), the top of the folding plate (11) is fixedly connected to a hydraulic rod (12) and a clamp (14), the end of the hydraulic rod (12) away from the folding plate (11) is fixedly connected to an extrusion plate (13), and the top of the clamp (14) is sleeved with a threaded rod (15); The stretcher (2) includes a shaft seat (21), the top end of the shaft seat (21) is fixedly connected to the folding plate (11), a screw rod (22) is rotatably mounted on the inner side of the shaft seat (21), and a stretching assembly (23) is threadedly connected to the outer side of the screw rod (22); The clamp (3) includes a support frame (31), the outer side of the support frame (31) is fixedly connected to a rib plate (32), a driving rod (33) is provided on the side of the support frame (31) away from the rib plate (32), the bottom end and the outer side of the driving rod (33) are both threadedly connected to a limit block (34), the end face of the limit block (34) is fixedly connected to the support frame (31), the outer side of the driving rod (33) is sleeved with a driver (35), and the driver (35) is arranged above the limit block (34); A forked plate (36) is threadedly connected to the central portion of the outer side of the driving rod (33); the forked plate (36) is arranged between the two limit blocks (34); and a clamping assembly (37) is fixedly mounted on the surface of the forked plate (36); The stretching assembly (23) comprises a slider (231), the slider (231) being threadedly connected to the screw rod (22), both ends of the slider (231) being fixedly connected to external blocks (232), the end surface of the external block (232) being fixedly connected to a U-shaped bracket (233), the inner side of the U-shaped bracket (233) being fixedly connected to a vertical rod (234), the outer side of the vertical rod (234) being slidably mounted with a stacking plate (235), the surface of the stacking plate (235) being inserted with a clamping block (236), and the bottom of the clamping block (236) being fixedly connected to a clamping plate (237).

2. A metal material fatigue resistance detection device according to claim 1, characterized in that: The driver (35) comprises an outer frame (351), the bottom of the outer frame (351) is fixedly connected to the limit block (34), a free rod (353) is rotatably mounted on the outer side of the outer frame (351), the outer end of the free rod (353) is fixedly connected to a turning handle (352), an inner frame (354) is fixedly mounted inside the outer frame (351), the inner frame (354) is sleeved on the outer side of the driving rod (33), and the top of the driving rod (33) is fixedly connected to the rotating block (355).

3. The metal material fatigue resistance detection device according to claim 1, characterized in that: The clamping assembly (37) comprises a support block (371), the outer side of the support block (371) is fixedly connected to the bifurcated plate (36), the surface of the support block (371) is fixedly connected to a side plate (372), and a clamping plate (375) is provided above the side plate (372).

4. A metal material fatigue resistance detection device according to claim 3, characterized in that: The top of the splint (375) is fixedly connected to a sleeve (379), and a rotating tooth (374) is provided at one end of the sleeve (379) away from the splint (375). A circular groove (378) is provided at the bottom of the rotating tooth (374), and the sleeve (379) is slidably installed inside the circular groove (378).

5. The metal material fatigue resistance detection device according to claim 4, characterized in that: The bottom of the rotating tooth (374) is fixedly connected to a central shaft (373), the bottom of the central shaft (373) is fixedly connected to a lower clamp (377), the central shaft (373) is threadedly connected to the support block (371), and a fixer (376) is inserted into the interior of the support block (371).

6. The metal material fatigue resistance detection device according to claim 5, characterized in that: The fixer (376) includes a tooth plate (3761), the outer side of the tooth plate (3761) is inserted into the interior of the support block (371), the bottom of the tooth plate (3761) is fixedly connected to a wave plate (3762), the interior of the support block (371) is provided with an oblique groove (3763), and the interior of the oblique groove (3763) is slidably installed with a support rod (3764).

7. The metal material fatigue resistance detection device according to claim 6, characterized in that: The lower clamp (377) includes a No. 1 shaft sleeve (3771), the inner side of the No. 1 shaft sleeve (3771) is fixedly connected to the central shaft (373), the outer side of the No. 1 shaft sleeve (3771) is rotatably mounted with a deflection frame (3772), the inner side of the deflection frame (3772) is fixedly connected to an extension plate (3773), the bottom of the extension plate (3773) is fixedly connected to a spring (3774), and the end of the spring (3774) away from the extension plate (3773) is fixedly connected to a sliding plate (3775).

8. The metal material fatigue resistance detection device according to claim 7, characterized in that: The outer side of the No. 1 shaft sleeve (3771) is fixedly connected to the No. 2 shaft sleeve (3776), the inner side of the No. 2 shaft sleeve (3776) is slidably connected to the sliding plate (3775), the bottom of the sliding plate (3775) is fixedly connected to the lower pressure frame (3777), the bottom of the lower pressure frame (3777) is slidably connected to the lower clamping assembly (3779), the inner side of the lower clamping assembly (3779) is fixedly connected to the No. 2 shaft sleeve (3776), and the top of the lower clamping assembly (3779) is inserted with an insertion rod (3778).

9. The metal material fatigue resistance detection device according to claim 8, characterized in that: The lower clamping assembly (3779) includes a bottom shell (7791), the inner side of the bottom shell (7791) is fixedly connected to the second shaft sleeve (3776), the bottom of the bottom shell (7791) is fixedly connected to a support (7792), a push rod (7793) is slidably installed inside the support (7792), and the end face of the push rod (7793) is fixedly connected to a clamping block (7794).

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