Metal rubber joint fatigue test tool

Abstract

The invention discloses a metal rubber joint fatigue test tool, and relates to the technical field of rubber joint test tools, the metal rubber joint fatigue test tool comprises a test seat, core shaft clamping assemblies and a joint main body, the top of the test seat is fixedly provided with a mounting rack, and the two core shaft clamping assemblies are respectively arranged on two sides of the test seat. When a rubber joint is tested, the sliding seat and the driving gear act synergistically, so that the turntable drives the clamping blocks to dynamically adjust the distance through the eccentric motion of the connecting rod, the real-time matching of the clamping surface and the rubber shrinkage amount is realized, and the axial load is ensured to be stably transmitted to a test piece. In addition, the ratchet wheel and pawl mechanism automatically maintains the clamping force in the returning stage, and slipping caused by sudden release of rubber elastic potential energy is avoided. And the rack is matched with the overturning gear, so that the clamping force can be adjusted after a certain stroke of return and when the elastic potential energy is attenuated, and automatic overturning is realized by matching with axial reciprocating motion, so that the result accuracy of the fatigue test tool is comprehensively improved.

Description

Technical Field

[0001] This invention relates to the field of rubber joint testing fixtures, specifically a metal-rubber joint fatigue testing fixture. Background Technology

[0002] Rubber joints are elastic connectors composed of rubber and metal components. They provide flexible connections and buffer vibration and impact, and are widely used in flexible connection positions to reduce vibration and noise. With the rapid development of China's rail transit industry, high speed, safety, and comfort have become important development trends in the design and manufacturing of rail vehicles. As a key flexible connector in locomotives and rolling stock, metal-rubber joints are lighter and more flexible than traditional rigid joints, effectively reducing vibration and noise. Their main structure consists of a metal outer casing, a metal core shaft, and a rubber cylinder, with the rubber material itself contributing to vibration and noise reduction.

[0003] Current clamping methods for rubber joint testing typically involve pressing the rubber joint into a fixed tooling sleeve with a certain interference fit, then mounting the sleeve on the test bench for radial and axial stiffness tests. Alternatively, threaded screws, bolts, or other screws can be used for tightening. However, these clamping methods result in a fixed clamping force. During actual axial testing, the rubber shrinks in diameter when stretched, causing a tiny gap between the inner diameter of the outer sleeve and the rubber layer. This can lead to slippage between the clamping components and the outer sleeve surface under high loads, preventing the axial force output by the loading device from being fully transmitted to the specimen. This instantaneous slippage can cause data jumps, resulting in insufficient preset thrust and making it difficult to guarantee the accuracy of fatigue testing of the rubber joint. Summary of the Invention

[0004] The purpose of this invention is to provide a fatigue testing fixture for metal-rubber joints to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a metal-rubber joint fatigue testing fixture, comprising a test seat, a mandrel clamping assembly, and a joint body, wherein a mounting frame is fixedly installed on the top of the test seat, and two mandrel clamping assemblies are respectively installed on both sides of the test seat;

[0006] The test stand is provided with a moving clamping component on the top. The moving clamping component includes two support frames symmetrically arranged on both sides of the joint body. The two support frames move closer together in the same direction so that the clamping surface keeps up with the amount of rubber shrinkage in real time.

[0007] The test stand is provided with a return locking component on the top, which includes a ratchet on the top of the test stand to maintain the original clamping force during the return.

[0008] Preferably, the process clamping component includes a sliding groove extending through the front and rear side walls of the mounting frame, with a support frame slidably connected to the inner wall of each sliding groove. Clamping blocks are slidably connected to the inner walls of the two adjacent support frames, and a handle is threaded into the internal parts of the support frames. The ends of the two adjacent handles are rotatably connected to the opposite sides of the two clamping blocks. A hydraulic push rod is fixedly mounted on the top of the test bench, and a slide block is fixedly connected to one end of the hydraulic push rod. The bottom of the slide block is slidably connected to the top surface of the test bench, and support rods are rotatably connected to the outer walls of both sides of the slide block. A drive gear is rotatably connected to the outer wall of each support rod.

[0009] Preferably, the top of the test stand is symmetrically fixedly connected with a vertical rod, and the inside of the vertical rod is slidably connected with a horizontal rod. The bottom of the horizontal rod is provided with toothed grooves at equal intervals corresponding to the drive gear, and the top of the drive gear meshes with the inner wall of the toothed groove.

[0010] Preferably, a turntable is fixedly connected to the outer wall of the end of the support rod away from the slide, and a connecting rod is eccentrically and movably connected to the other end face of the turntable. A connecting block is fixedly connected to the bottom of the support frame, and the other end of the connecting rod is movably connected to the bottom of the connecting block.

[0011] Preferably, the upper and lower surfaces of the support frame are symmetrically provided with sliding grooves II, and the inner wall of the sliding groove II is slidably connected to a slider. The inner wall of the sliding groove I is provided with a limiting groove corresponding to the slider, and the outer wall of the slider is slidably connected to the inner wall of the limiting groove.

[0012] Preferably, mounting plates are fixedly connected to both ends of the crossbar, and springs are fixedly connected to the outer walls of the two mounting plates on the side that are close to each other. The ends of the two springs that are close to each other are respectively fixedly connected to the outer walls of the two uprights on the side that are far apart.

[0013] Preferably, the inner wall of the ratchet is fixedly connected to the outer wall of the support rod, and the two drive gears are fixedly connected to an auxiliary block at opposite ends of the ratchet. The bottom of the auxiliary block meshes with the top of the ratchet. Mounting blocks are fixedly connected to both outer walls of the slide block, and a rotating rod is rotatably connected to the inner wall of the mounting block. A fixing block is fixedly connected to the top of the rotating rod, and a pawl is hinged to one end of the fixing block. A tension spring is fixedly connected to one side of the pawl, and the other end of the tension spring is fixedly connected to the top of the fixing block.

[0014] Preferably, the pawl forms an elastic structure with the fixing block via a tension spring, and the top of the pawl is pressed into the groove of the ratchet by the tension spring.

[0015] Preferably, a flipping gear is fixedly connected to the bottom of the rotating rod, and a rack is fixedly connected to the top surface of the test seat corresponding to the flipping gear, with one side of the flipping gear meshing with the rack.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. When testing the rubber joint, first use two clamping blocks to pre-tighten and fix the outer sleeve of the joint body. Then, install two mandrel clamping assemblies on both sides of the test seat and insert and fix the mandrel of the joint body. After fixing the mandrel and the outer sleeve respectively, the axial test can be performed by moving the clamping blocks, or the torsion test can be performed by rotating the two mandrel clamping assemblies respectively, or the axial test can be performed simultaneously under torsion.

[0018] 2. During the testing of rubber joints, the axial test is conducted by using two clamping blocks to move the outer sleeve of the joint body. Through the cooperation of the slide and the drive gear, the turntable can move the two clamping blocks closer to each other via the eccentric movement of the connecting rod. This allows the clamping force between the clamping blocks and the joint body to be automatically adjusted according to the axial movement distance during the axial test. The clamping surface keeps up with the shrinkage of the rubber in real time, ensuring that the axial output force can be stably transmitted to the specimen, thus helping to ensure the accuracy of the results of this fatigue testing fixture.

[0019] 3. During the rubber joint test, to avoid slippage at the beginning of the return stroke due to the large elastic potential energy accumulated during the forward stroke, if the clamping force decreases, a ratchet and pawl mechanism is used to automatically maintain the original clamping force during the return stroke, preventing slippage caused by the sudden release of elastic potential energy. A rack and pinion mechanism is used to automatically adjust the clamping force after a certain distance of return stroke when the elastic potential energy is lower. Simultaneously, it can automatically rotate to accommodate axial reciprocating movement, thus helping to ensure the accuracy of the fatigue test results. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 A side view of the structure with the mandrel clamping assembly removed.

[0022] Figure 3 This is a top view of the overall structure of the present invention;

[0023] Figure 4 This is a schematic diagram showing the connection relationship between the support frame and the slide groove of the present invention;

[0024] Figure 5 This is a schematic diagram illustrating the kinematic relationship between the support frame and the turntable of the present invention;

[0025] Figure 6 This is a schematic diagram illustrating the kinematic relationship between the ratchet and the auxiliary block in this invention.

[0026] In the diagram: 1. Test stand; 2. Mounting frame; 3. Mandrel clamping assembly; 6. Slide groove one; 7. Limiting groove; 8. Joint body; 4. Moving clamping component; 401. Support frame; 402. Clamping block; 403. Rotary handle; 404. Hydraulic push rod; 405. Slide seat; 406. Support rod; 407. Drive gear; 408. Vertical rod; 409. Horizontal rod; 410. Tooth groove; 411. Turntable; 412. Connecting rod; 413. Connecting block; 414. Slide groove two; 415. Slider; 416. Mounting plate; 417. Spring; 5. Return locking component; 501. Ratchet; 502. Auxiliary block; 503. Mounting block; 504. Rotating rod; 505. Fixing block; 506. Pawl; 507. Tension spring; 508. Reversing gear; 509. Rack. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1, please refer to Figures 1-6 The present invention provides a technical solution: a metal-rubber joint fatigue testing fixture, including a test seat 1, a mandrel clamping assembly 3, and a joint body 8. A mounting bracket 2 is fixedly installed on the top of the test seat 1, and two mandrel clamping assemblies 3 are respectively installed on both sides of the test seat 1.

[0029] The test stand 1 is equipped with a moving clamp component 4 on its top;

[0030] Furthermore, the process clamping component 4 also includes a sliding groove 6 that runs through the front and rear side walls of the mounting frame 2, and the inner walls of the sliding groove 6 are slidably connected to a support frame 401. The inner walls of the two support frames 401 that are close to each other are slidably connected to a clamping block 402. The support frame 401 is internally threaded with a handle 403. The two handles 403 that are close to each other are rotatably connected to the two clamping blocks 402 that are far apart. A hydraulic push rod 404 is fixedly installed on the top of the test seat 1, and one end of the hydraulic push rod 404 is fixedly connected to a slide 405. The bottom of the slide 405 is slidably connected to the top surface of the test seat 1, and the two outer walls of the slide 405 are rotatably connected to support rods 406. The outer walls of the support rods 406 are rotatably connected to drive gears 407.

[0031] More specifically, in this embodiment, when using this fatigue testing fixture, the joint body 8 to be tested is first placed from the side of the mounting frame 2 between the two clamping blocks 402. Then, a support frame 401 is slidably connected to the inner wall of the slide groove 6. The clamping blocks 402 are slidably connected to the inner walls of the two support frames 401 that are close to each other. A handle 403 is threaded into the inside of the support frame 401. The ends of the two handles 403 that are close to each other are rotatably connected to the two clamping blocks 402 that are far apart. Thus, the two clamping blocks 402 can be driven by rotating the handles 403. 02. The two mandrel clamping assemblies are brought closer together to pre-tighten and fix the joint body 8. Then, the two mandrel clamping assemblies 3 are installed on both sides of the test base 1 respectively. After pre-tightening and fixing the outer sleeve of the joint body 8, the two mandrel clamping assemblies 3 are installed on both sides of the test base 1 respectively, and the mandrel of the joint body 8 is inserted and fixed. After fixing the mandrel and the outer sleeve respectively, the axial test can be carried out by moving the clamping block 402, or the torsion test can be carried out by rotating the mandrel clamping assemblies 3 respectively, or the axial test can be carried out simultaneously under torsion.

[0032] Next, during the axial test, a hydraulic push rod 404 is fixedly installed on the top of the test base 1, and one end of the hydraulic push rod 404 is fixedly connected to a slide block 405. The bottom of the slide block 405 is slidably connected to the top surface of the test base 1, and the two outer walls of the slide block 405 are rotatably connected to support rods 406. The outer walls of the support rods 406 are rotatably connected to drive gears 407, so that the hydraulic push rod 404 can drive the two drive gears 407 to reciprocate axially. Then, a vertical rod 408 is symmetrically fixedly connected to the top of the test base 1, and a horizontal rod 409 is slidably connected inside the vertical rod 408. The bottom of the horizontal rod 409 is provided with toothed grooves 410 at equal intervals corresponding to the drive gears 407, and the top of the drive gears 407 meshes with the inner wall of the toothed grooves 410. So that when the drive gears 407 move axially, the toothed grooves 410 can be used to make the drive gears 407 rotate during the axial movement.

[0033] Next, a turntable 411 is fixedly connected to the outer wall of the end of the support rod 406 away from the slide block 405, and a connecting rod 412 is eccentrically and movably connected to the other end face of the turntable 411. A connecting block 413 is fixedly connected to the bottom of the support frame 401, and the other end of the connecting rod 412 is movably connected to the bottom of the connecting block 413. Thus, when the drive gear 407 can drive the turntable 411 to rotate through the support rod 406, the universal connecting rod 412 can be used to make the clamping block 402 move from the joint. When the outer sleeve of the main body 8 moves axially to one side, the rotation of the turntable 411 causes the connecting rod 412 connected to the upper end face of the turntable 411 to move eccentrically. Under the rotation of the turntable 411, it can move to the lower end face of the turntable 411, thereby pulling the two clamping blocks 402 and bringing the two clamping blocks 402 closer to each other. Thus, the clamping force between the clamping blocks 402 and the joint body 8 can be automatically adjusted according to the axial movement distance during the axial test.

[0034] Next, the upper and lower surfaces of the support frame 401 are symmetrically provided with sliding grooves 414, and the inner wall of the sliding groove 414 is slidably connected to the slider 415. The inner wall of the sliding groove 6 is provided with a limiting groove 7 corresponding to the slider 415, and the outer wall of the slider 415 is slidably connected to the inner wall of the limiting groove 7. Thus, the stability of the clamping block 402 during movement can be ensured through the cooperation between the slider 415 and the sliding groove 414.

[0035] As described above, during the axial test of the rubber joint, the two clamping blocks 402 drive the outer sleeve of the joint body 8. Through the cooperation of the slide block 405 and the drive gear 407, the turntable 411 can drive the two clamping blocks 402 to move closer to each other through the eccentric movement of the connecting rod 412. Thus, the clamping force between the clamping blocks 402 and the joint body 8 can be automatically adjusted according to the axial movement distance during the axial test. The clamping surface keeps up with the shrinkage of the rubber in real time, ensuring that the axial output force can be stably transmitted to the specimen, thereby helping to ensure the accuracy of the results of this fatigue test fixture.

[0036] In Example 2, based on the above examples, a return locking component 5 is provided on the top of the test seat 1;

[0037] Furthermore, the inner wall of the ratchet 501 is fixedly connected to the outer wall of the support rod 406. The two drive gears 407 are fixedly connected to the ratchet 501 at opposite ends. The bottom of the auxiliary block 502 meshes with the top of the ratchet 501. Mounting blocks 503 are fixedly connected to both outer walls of the slide block 405. A rotating rod 504 is rotatably connected to the inner wall of the mounting block 503. A fixing block 505 is fixedly connected to the top of the rotating rod 504. A pawl 506 is hinged to one end of the fixing block 505. A tension spring 507 is fixedly connected to one side of the pawl 506. The other end of the tension spring 507 is fixedly connected to the top of the fixing block 505.

[0038] More specifically, in the embodiment, during the axial movement process, that is, when the clamping block 402 moves axially from the middle of the outer sleeve of the joint body 8 to one side, the rubber is stretched by the outer sleeve, so that the rubber accumulates a large elastic potential energy during the process. In order to avoid slippage when the clamping force decreases at the beginning of the return stroke, the inner wall of the ratchet 501 is fixedly connected to the outer wall of the support rod 406. The two drive gears 407 are fixedly connected to the ratchet 501 at opposite ends, and the bottom of the auxiliary block 502 meshes with the top of the ratchet 501. Thus, during the rotation of the drive gear 407, the ratchet 501 will be rotated synchronously by the setting of the auxiliary block 502, which in turn drives the support rod 406 to rotate, thereby realizing the rotation of the turntable 411.

[0039] Next, mounting blocks 503 are fixedly connected to both outer walls of the slide block 405, and a rotating rod 504 is rotatably connected to the inner wall of the mounting block 503. A fixing block 505 is fixedly connected to the top of the rotating rod 504, and a pawl 506 is hinged to one end of the fixing block 505. A tension spring 507 is fixedly connected to one side of the pawl 506, and the other end of the tension spring 507 is fixedly connected to the top of the fixing block 505. The pawl 506 and the fixing block 505 form an elastic structure through the tension spring 507, and the top of the pawl 506 is pressed into the groove of the ratchet 501 by the tension spring 507. Thus, during the axial movement, the drive gear 407 can drive the ratchet 501 to rotate normally through the auxiliary block 502 through the cooperation of the pawl 506 and the ratchet 501. When preparing to return, the pawl 506 will restrict the ratchet 501, preventing it from rotating during the return process. This allows the clamping force to be maintained automatically during the return trip, preventing slippage caused by sudden release of elastic potential energy;

[0040] Next, mounting plates 416 are fixedly connected to both ends of the crossbar 409. Springs 417 are fixedly connected to the outer walls of the two mounting plates 416 that are close to each other. The ends of the two springs 417 that are close to each other are fixedly connected to the outer walls of the two uprights 408 that are far apart. Thus, during the axial return movement, since the drive gear 407 cannot rotate, it will drive the crossbar 409 to move, so as to achieve normal axial return movement. Then, a flipping gear 508 is fixedly connected to the bottom of the rotating rod 504. The top surface of the test seat 1 is fixedly connected to the flipping gear 508. A rack 509 is attached, and one side of the reversing gear 508 meshes with the rack 509. After moving a certain distance in the axial return stroke, the reversing gear 508 will mesh with the rack 509 to drive the rotating rod 504 to rotate. This will cause the pawl 506 to disengage from the ratchet 501. At this time, the drive gear 407 is no longer restricted to rotation. Also, due to the return stroke, the stretching of the rubber is relaxed and buffered. Thus, the spring 417 can drive the crossbar 409 back to the center position between the two uprights 408 through the rebound force.

[0041] Then, during the axial movement in another direction, the ratchet 506 can be shifted by the engagement of the flip gear 508 and the rack 509, moving from one side under the ratchet 501 to the other side under the ratchet, achieving unidirectional rotation in another direction to match the axial movement from the middle of the outer sleeve to both ends, and can automatically flip to adapt to the axial reciprocating movement.

[0042] As described above, during the rubber joint test, to avoid slippage when the clamping force decreases during the return stroke due to the large elastic potential energy accumulated in the rubber during the forward stroke, the ratchet 501 and pawl 506 work together to automatically maintain the original clamping force during the return stroke, preventing slippage caused by the sudden release of elastic potential energy. The rack 509 and the reversing gear 508 work together to automatically adjust the clamping force when the elastic potential energy is lower after a certain distance of return stroke. Simultaneously, it can automatically rotate to accommodate axial reciprocating movement, thus helping to ensure the accuracy of the fatigue test results.

[0043] Working principle: During the axial test, the hydraulic push rod 404 can drive the two drive gears 407 to move axially back and forth. When the drive gears 407 move axially, the tooth grooves 410 can make the drive gears 407 rotate during the axial movement.

[0044] When the drive gear 407 can drive the turntable 411 to rotate through the support rod 406, the universal connecting rod 412 can cooperate to make the clamping block 402 move axially from the middle of the outer sleeve of the joint body 8 to one side. At this time, due to the rotation of the turntable 411, the connecting rod 412 connected to the upper end face of the turntable 411 moves eccentrically and can move to the lower end face of the turntable 411 under the rotation of the turntable 411. This can pull the two clamping blocks 402 and bring them closer to each other. Thus, the clamping force between the clamping block 402 and the joint body 8 can be automatically adjusted according to the axial movement distance during the axial test.

[0045] Then, during the axial movement, as the drive gear 407 rotates, the auxiliary block 502 synchronously drives the ratchet 501 to rotate, which in turn drives the support rod 406 to rotate, thus rotating the turntable 411. During the axial movement, the drive gear 407 can drive the ratchet 501 to rotate normally through the auxiliary block 502, thanks to the cooperation between the pawl 506 and the ratchet 501. When preparing to return, the pawl 506 restricts the ratchet 501, preventing it from rotating during the return process. This ensures that the original clamping force is automatically maintained during the return, preventing slippage caused by the sudden release of elastic potential energy.

[0046] During the axial return stroke, since the drive gear 407 cannot rotate, it will drive the crossbar 409 to move to achieve normal axial return stroke. Then, the bottom of the rotating rod 504 is fixedly connected to the flip gear 508, and the top surface of the test seat 1 is fixedly connected to the rack 509 corresponding to the flip gear 508. One side of the flip gear 508 meshes with the rack 509. After the axial return stroke has moved a certain distance, the flip gear 508 will mesh with the rack 509 to drive the rotating rod 504 to rotate. This will cause the pawl 506 to disengage from the ratchet 501. At this time, the drive gear 407 is no longer restricted by rotation. Since the return stroke has been a certain distance, the stretching of the rubber is relaxed and buffered. Thus, the spring force of the spring 417 can drive the crossbar 409 back to the center position between the two uprights 408.

[0047] Then, during the axial movement in another direction, the ratchet 506 can be shifted by the engagement of the flip gear 508 and the rack 509, moving from one side below the ratchet 501 to the other side below, achieving unidirectional rotation in another direction to match the axial movement from the middle of the outer sleeve to both ends, and can automatically flip to adapt to the axial reciprocating movement.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fatigue testing fixture for a metal-rubber joint, comprising a test seat (1), a mandrel clamping assembly (3), and a joint body (8), characterized in that: The test stand (1) is fixedly mounted with a mounting bracket (2), and the two mandrel clamping assemblies (3) are respectively mounted on both sides of the test stand (1); The test seat (1) is provided with a process moving clamp component (4) on the top. The process moving clamp component (4) includes two support frames (401) symmetrically arranged on both sides of the joint body (8) so that the clamping surface can keep up with the amount of rubber shrinkage in real time by moving the two support frames (401) in the same direction. The test seat (1) is provided with a return locking component (5) at the top. The return locking component (5) includes a ratchet (501) provided at the top of the test seat (1) to maintain the original clamping force during the return.

2. The fatigue testing fixture for a metal-rubber joint according to claim 1, characterized in that, The process clamping component (4) further includes a sliding groove (6) that runs through the front and rear side walls of the mounting frame (2), and the inner wall of the sliding groove (6) is slidably connected to a support frame (401). The inner walls of the two support frames (401) that are close to each other are slidably connected to a clamping block (402). The support frame (401) is threaded with a handle (403). The two handles (403) that are close to each other are rotatably connected to the two clamping blocks (402) that are far apart. The top of the test seat (1) is fixedly installed with a hydraulic push rod (404), and one end of the hydraulic push rod (404) is fixedly connected to a slide (405). The bottom of the slide (405) is slidably connected to the top surface of the test seat (1), and the two outer walls of the slide (405) are rotatably connected to a support rod (406). The outer wall of the support rod (406) is rotatably connected to a drive gear (407).

3. The fatigue testing fixture for a metal-rubber joint according to claim 2, characterized in that, The test stand (1) is symmetrically fixedly connected to the top of a vertical rod (408), and a horizontal rod (409) is slidably connected inside the vertical rod (408). The bottom of the horizontal rod (409) is provided with toothed grooves (410) at equal intervals corresponding to the drive gear (407), and the top of the drive gear (407) meshes with the inner wall of the toothed groove (410).

4. The fatigue testing fixture for a metal-rubber joint according to claim 3, characterized in that, The support rod (406) is fixedly connected to a turntable (411) on the outer wall of one end away from the slide (405), and a connecting rod (412) is eccentrically connected to the other end face of the turntable (411). A connecting block (413) is fixedly connected to the bottom of the support frame (401), and the other end of the connecting rod (412) is movably connected to the bottom of the connecting block (413).

5. The fatigue testing fixture for a metal-rubber joint according to claim 4, characterized in that, The upper and lower surfaces of the support frame (401) are symmetrically provided with sliding grooves (414), and the inner wall of the sliding groove (414) is slidably connected to a slider (415). The inner wall of the sliding groove (6) is provided with a limiting groove (7) corresponding to the slider (415), and the outer wall of the slider (415) is slidably connected to the inner wall of the limiting groove (7).

6. The fatigue testing fixture for a metal-rubber joint according to claim 5, characterized in that, The two ends of the crossbar (409) are fixedly connected to the mounting plates (416), and the outer walls of the two mounting plates (416) that are close to each other are fixedly connected to the springs (417). The ends of the two springs (417) that are close to each other are respectively fixedly connected to the outer walls of the two uprights (408) that are far apart.

7. The fatigue testing fixture for a metal-rubber joint according to claim 6, characterized in that, The inner wall of the ratchet (501) is fixedly connected to the outer wall of the support rod (406). The two drive gears (407) are fixedly connected to the ratchet (501) with one end facing away from each other. The bottom of the auxiliary block (502) meshes with the top of the ratchet (501). The two outer walls of the slide (405) are fixedly connected to the mounting blocks (503). The inner wall of the mounting block (503) is rotatably connected to the rotating rod (504). The top of the rotating rod (504) is fixedly connected to the fixing block (505). One end of the fixing block (505) is hinged to the pawl (506). One side of the pawl (506) is fixedly connected to the tension spring (507). The other end of the tension spring (507) is fixedly connected to the top of the fixing block (505).

8. The fatigue testing fixture for a metal-rubber joint according to claim 7, characterized in that, The pawl (506) forms an elastic structure with the fixing block (505) through the tension spring (507), and the top of the pawl (506) is pressed into the groove of the ratchet (501) by the tension spring (507).

9. The fatigue testing fixture for a metal-rubber joint according to claim 8, characterized in that, The bottom of the rotating rod (504) is fixedly connected to a reversing gear (508), and the top surface of the test seat (1) is fixedly connected to a rack (509) corresponding to the reversing gear (508), and one side of the reversing gear (508) meshes with the rack (509).

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