A drive chain pre-production wear test device and a test method thereof

Abstract

The application discloses a transmission chain pre-production wear test device and a test method thereof in the technical field of transmission chain production and processing, which comprises an outer frame, a plurality of transmission gears are rotationally arranged in the outer frame at equal intervals, a transmission chain is connected to the transmission gears, a second fixed shaft is fixedly connected to the transmission gears, a second gear is arranged on the second fixed shaft, a rotation adjusting assembly is arranged on the second fixed shaft, and the rotation adjusting assembly is used for adjusting the connection mode of the second gear and the second fixed shaft. A plurality of groups of transmission chains can be subjected to wear tests by using one group of power sources, so that the rotation speeds of the transmission chains are the same, the experimental results are more accurate, the transmission chains subjected to wear tests are replaced by using the rotation adjusting assembly without affecting the tests of other transmission chains, and the transmission chain wear test is better.

Description

Technical Field

[0001] This invention relates to the field of transmission chain processing technology, specifically to a wear testing device and method for transmission chains before production. Background Technology

[0002] As a transmission component, the transmission chain needs to undergo destructive wear testing after processing and production to test its actual service life. For transmission chains of the same model produced in batches, wear testing is conducted by sampling, and the number of samples to be tested depends on the production quantity.

[0003] Existing transmission chain wear tests are all conducted individually and are time-consuming. If multiple transmission chains are to be tested for wear simultaneously, it will consume a lot of energy. If multiple transmission chains are driven by one drive source to conduct wear tests synchronously, after one transmission chain shows wear, the worn transmission chain cannot be removed individually. All test transmission chains need to be suspended and replaced.

[0004] Based on this, the present invention designs a wear testing device and method for transmission chains before production to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a wear testing device and method for transmission chains before production, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wear testing device for a transmission chain before production, comprising an outer frame, wherein a plurality of transmission gears are rotatably arranged inside the outer frame and are equally spaced, the plurality of transmission gears being connected to a transmission chain, a second fixed shaft being fixedly connected to each transmission gear, a second gear being disposed on the second fixed shaft, and a rotation adjustment component being disposed on the second fixed shaft, the rotation adjustment component being used to adjust the connection mode of the second gear and the second fixed shaft, such that the second gear can be fixedly connected to the second fixed shaft or rotatably connected to the second fixed shaft, a first fixed shaft being disposed on the outer frame, a first gear being rotatably connected to the first fixed shaft, and a limit fixing component being disposed at one end of the first fixed shaft, the limit fixing component being used to adjust the position of the first fixed shaft according to the length of the transmission chain.

[0007] As a further embodiment of the present invention, the limiting and fixing assembly includes a connecting frame, which is disposed on one side of the first fixing shaft. A connecting groove is provided on the outer frame, and the connecting frame is slidably disposed inside the connecting groove. A first spring is fixedly connected to one end of the connecting frame, and the other end of the first spring is fixedly connected to the first fixing shaft. The bottom of the first fixing shaft is slidably disposed inside the connecting groove. A locking plate is fixedly connected to the top of the connecting frame. Sliding grooves are provided on both sides of the outer frame of the connecting groove. A threaded rod is slidably connected to the locking plate, and the bottom of the threaded rod is slidably disposed inside the sliding groove.

[0008] As a further embodiment of the present invention, the rotation adjustment assembly includes a rotating cylinder, which is fixedly sleeved outside the second fixed shaft. A sliding cylinder is rotatably connected to the outside of the rotating cylinder. A plurality of equidistantly distributed limiting plates are rotatably connected to the bottom of the sliding cylinder. A torsion spring for resetting is fixedly connected to the limiting plate. A connecting cylinder is slidably connected to the outside of the sliding cylinder. The connecting cylinder has a fixing groove for aligning with the limiting plate. One end of the limiting plate can pass through the fixing groove and is located on the outside of the connecting cylinder. A support plate is fixedly connected to the bottom of the connecting cylinder. The support plate has an alignment opening. A convex shaft for engaging with the alignment opening is fixedly connected to the bottom of the second gear. A second washer is fixedly connected to the bottom end of the connecting cylinder. A first washer is provided at the bottom of the second washer. Both the second washer and the first washer are... A second spring is connected between the second and first washers, and the second fixed shaft is sleeved on the outside of the second fixed shaft. A first limiting plate is fixedly connected to the second fixed shaft at the top of the rotating cylinder. A second limiting plate is fixedly connected to the connecting groove at the bottom of the first washer. Several connecting shafts are fixedly connected to the top of the second gear at equal intervals. A connecting disc is rotatably connected to the top of the connecting shaft. Several fixed blocks are fixedly connected to the top of the second gear at equal intervals. An insert block is slidably connected to the top of the fixed block. A slide rail is provided on one side of the fixed block. A slider is slidably connected inside the slide rail. The top of the slider is fixedly connected to the insert block. A third spring for resetting is fixedly connected to one side of the slider. An insertion port for docking with the insert block is provided on the second fixed shaft. A reset cylinder is slidably connected to the top of the connecting cylinder.

[0009] As a further embodiment of the present invention, a drive motor is fixedly connected inside the outer frame, and the output end of the drive motor is fixedly connected to the bottom of the second fixed shaft.

[0010] As a further embodiment of the present invention, the first gear is the same size as the second gear.

[0011] As a further embodiment of the present invention, the inner walls of the connecting cylinder are all smooth walls, and the sliding cylinder can be completely fitted with the inner wall of the connecting cylinder.

[0012] As a further embodiment of the present invention, photoelectric switches are fixedly connected to the upper ends of the outer frames on both sides of the connecting groove.

[0013] A method for wear testing of a transmission chain before production, the method comprising the following steps:

[0014] Step 1: Connect one end of the experimental transmission chain to the second gear and the other end to the first gear;

[0015] Step 2: Fix the second gear on the second fixed shaft using the rotation adjustment assembly, and fit the first gear onto the first fixed shaft. Adjust the first fixed shaft to a suitable distance using the limiting and fixing assembly.

[0016] Step 3: Conduct a wear test on the transmission chain by rotating the transmission gear to drive the second gear to rotate as well;

[0017] Step 4: After the transmission chain wears down, its overall length will be stretched. After stretching, the distance between the first gear and the second gear will increase. At this time, the limiting and fixing component will drive the first fixed shaft to slide and compare with the initial position to complete the recording of the wear of the transmission chain.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. Multiple transmission chains can be tested for wear using a single power source. This saves energy and ensures that the rotation speed of each transmission chain is the same. As a comparative test, the test results are more accurate. Furthermore, by rotating the adjustment component, the worn transmission chain can be replaced without affecting the test of other transmission chains, resulting in a better effect during the transmission chain wear test. Attached Figure Description

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

[0021] Figure 2 Schematic diagram of the position rotation adjustment component;

[0022] Figure 3 This is a schematic diagram of the overall structure of the limiting and fixing component;

[0023] Figure 4 This is a schematic diagram of the exploded structure of the rotation adjustment component;

[0024] Figure 5 A schematic diagram of the explosive structure of the connecting cylinder, sliding cylinder, rotating cylinder, and second spring;

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the insert and the fixing frame;

[0026] Figure 7 This is a flowchart of the method of the present invention.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Outer frame; 2. Connecting groove; 3. Photoelectric switch; 4. Slide groove; 5. First gear; 6. First fixed shaft; 7. First spring; 8. Connecting frame; 9. Locking plate; 10. Threaded rod; 11. Reset cylinder; 12. Second gear; 13. Transmission gear; 14. Drive motor; 15. Transmission chain; 16. Connecting disc; 17. Connecting shaft; 18. Insert block; 19. Fixing block; 20. Connecting cylinder; 21. Support plate; 22. Alignment port; 23. Second spring; 24. First gasket; 25. First limiting plate; 26. Insertion port; 27. Second fixed shaft; 28. Second limiting plate; 29. ​​Rotating cylinder; 30. Sliding cylinder; 31. Limiting plate; 32. Fixed groove; 33. Second gasket; 34. Slide rail; 35. Slider; 36. Third spring. Detailed Implementation

[0029] Please see Figure 1-7 This invention provides a technical solution: a wear testing device for a transmission chain before production, comprising an outer frame 1, wherein a plurality of transmission gears 13 are rotatably arranged inside the outer frame 1 and are equally spaced, the plurality of transmission gears 13 being connected to a transmission chain 15, a second fixed shaft 27 being fixedly connected to the transmission gears 13, a second gear 12 being disposed on the second fixed shaft 27, and a rotation adjustment component being disposed on the second fixed shaft 27, the rotation adjustment component being used to adjust the connection mode of the second gear 12 and the second fixed shaft 27, such that the second gear 12 can be fixedly connected to the second fixed shaft 27 or rotatably connected to the second fixed shaft 27, a first fixed shaft 6 being disposed on the outer frame 1, a first gear 5 being rotatably connected to the first fixed shaft 6, and a limit fixing component being disposed at one end of the first fixed shaft 6, the limit fixing component being used to adjust the position of the first fixed shaft 6 according to the length of the transmission chain;

[0030] In practical application, the above scheme involves connecting one end of the experimental transmission chain to the second gear 12 and the other end to the first gear 5. The second gear 12 is fixed to the second fixed shaft 27 via a rotation adjustment assembly, and the first gear 5 is connected to the first fixed shaft 6. The first fixed shaft 6 is adjusted to a suitable distance via a limiting and fixing assembly, allowing the transmission chain 15 to rotate and transmit power through the transmission gear 13. This enables multiple transmission chains to undergo wear tests simultaneously. If one transmission chain experiences wear and stretching, the rotation adjustment assembly will adjust the position of the first gear 5. The wear data of the transmission chain can then be compared without stopping the rotation of the transmission gear 13. By rotating the adjustment component to change the connection relationship between the second fixed shaft 27 and the second gear 12, the second fixed shaft 27 no longer rotates with the second gear 12. This allows the worn transmission chain to be removed from the second gear 12, and then a new transmission chain to be tested for wear can be replaced. The advantage of this method is that multiple transmission chains can be tested for wear using a single power source. This saves energy and ensures that the rotation speed of each transmission chain is the same. As a comparative experiment, the experimental results are more accurate. Furthermore, by rotating the adjustment component, the worn transmission chain can be replaced without affecting the experiments of other transmission chains, resulting in better performance during the wear test.

[0031] As a further embodiment of the present invention, the limiting and fixing assembly includes a connecting frame 8, which is disposed on one side of the first fixing shaft 6. A connecting groove 2 is provided on the outer frame 1, and the connecting frame 8 is slidably disposed inside the connecting groove 2. A first spring 7 is fixedly connected to one end of the connecting frame 8, and the other end of the first spring 7 is fixedly connected to the first fixing shaft 6. The bottom of the first fixing shaft 6 is slidably disposed inside the connecting groove 2. A locking plate 9 is fixedly connected to the top of the connecting frame 8. Sliding grooves 4 are respectively provided on the outer frame 1 on both sides of the connecting groove 2. A threaded rod 10 is slidably connected to the locking plate 9, and the bottom of the threaded rod 10 is slidably disposed inside the sliding groove 4.

[0032] When the above scheme is put into practical use, after one end of the first gear 5 is connected to the transmission chain and the other end of the transmission chain is connected and fixed to the second gear 12, the transmission chain is completely straightened by sliding the connecting frame 8 inside the connecting groove 2. After straightening, the connecting frame 8 is pulled to slide, so that the first spring 7 is stretched to a certain length. Then, the connecting frame 8 is fixed at this position by the threaded rod 10. In this way, when the transmission chain wears and is stretched, the elastic force of the first spring 7 will pull the first fixed shaft 6 and the first gear 5 to move together. The initial position of the first fixed shaft 6 is recorded. When the first fixed shaft 6 is displaced, it can be determined that the transmission chain has been worn and stretched. In this way, it is easy to fix transmission chains of various lengths, and the result can be obtained intuitively after the transmission chain wears and deforms.

[0033] As a further embodiment of the present invention, the rotation adjustment assembly includes a rotating cylinder 29, which is fixedly sleeved outside the second fixed shaft 27. A sliding cylinder 30 is rotatably connected to the outside of the rotating cylinder 29. A plurality of equidistantly distributed limiting plates 31 are rotatably connected to the bottom of the sliding cylinder 30. A torsion spring for resetting is fixedly connected to the limiting plate 31. A connecting cylinder 20 is slidably connected to the outside of the sliding cylinder 30. The connecting cylinder 20 has a fixing groove 32 for aligning with the limiting plate 31. One end of the limiting plate 31 can pass through the fixing groove 32 and is located on the outside of the connecting cylinder 20. A support plate 21 is fixedly connected to the bottom of the connecting cylinder 20. An alignment opening 22 is provided on the support plate 21. A convex shaft for engaging with the alignment opening 22 is fixedly connected to the bottom of the second gear 12. A second washer 33 is fixedly connected to the bottom of the connecting cylinder 20. A first washer 24 is provided at the bottom of the second washer 33. Both the second washer 33 and the first washer 24 are sleeved. Outside the second fixed shaft 27, a second spring 23 is connected between the second gasket 33 and the first gasket 24. A first limiting piece 25 is fixedly connected to the second fixed shaft 27 at the top of the rotating cylinder 29. A second limiting piece 28 is fixedly connected to the connecting groove 2 at the bottom of the first gasket 24. A plurality of connecting shafts 17 distributed at equal intervals are fixedly connected to the top of the second gear 12. A connecting disc 16 is rotatably connected to the top of the connecting shaft 17. A plurality of fixing blocks 19 distributed at equal intervals are fixedly connected to the top of the second gear 12. An insert block 18 is slidably connected to the top of the fixing block 19. A slide rail 34 is provided on one side of the fixing block 19. A slider 35 is slidably connected inside the slide rail 34. The top of the slider 35 is fixedly connected to the insert block 18. A third spring 36 for resetting is fixedly connected to one side of the slider 35. An insertion port 26 for docking with the insert block 18 is provided on the second fixed shaft 27. A reset cylinder 11 is slidably connected to the top of the connecting cylinder 20.

[0034] When the above solution is put into practical use, after connecting one end of the transmission chain and the second gear 12, and fixing the second gear 12 to the second fixed shaft 27, the second gear 12 is directly sleeved on the connecting cylinder 20 and slid downwards until the convex shaft at the bottom of the second gear 12 is inserted into the alignment port 22. The second gear 12 is then pressed down further, causing the connecting cylinder 20 to compress the second spring 23 and slide downwards. Figure 4-5As shown, due to the sliding connection between the rotating cylinder 29 and the sliding cylinder 30, the rotation of the second fixed shaft 27 will not affect the connecting cylinder 20. After the sliding limit plate 31 of the second gear 12 extends from the top of the insert block 18, the second gear 12 can be released. Under the elastic force of the second spring 23, the connecting cylinder 20 and the second gear 12 are pushed to slide upward. At this time, the limit plate 31 presses the top of the insert block 18 from inside the fixed groove 32, pushing the insert block 18 to slide along the slide rail 34 and stretch the third spring 36. The insert block 18 will gradually slide along the fixed groove 32 towards the second fixed shaft 27 until the insert block 18 is inserted into the insertion port 26 on the second fixed shaft 27. When the insert block 18 is inserted into the insertion port 26, the rotation of the second fixed shaft 27 will drive the second gear 12 to rotate together, thus completing the transmission from the second fixed shaft 27 to the second gear 12. The wear test is carried out by driving the transmission chain to rotate through the second fixed shaft 27. Finally, the reset cylinder 11 is sleeved on the top of the connecting cylinder 20.

[0035] When the drive chain needs to be replaced due to wear, press down on the reset cylinder 11 so that it contacts the limiting plate 31, and push the limiting plate 31 to slide inward into the fixing groove 32. Then, press down on the second gear 12 through the connecting plate 16 so that the second gear 12 and the connecting cylinder 20 slide down together. When the insert 18 disengages from the limiting plate 31, it will be reset under the elastic force of the third spring 36. At this time, the limiting plate 31 is pressed into the fixing groove 32 by the reset cylinder 11. Slowly release the connecting plate 16 so that the connecting cylinder 20 drives the second gear 12 to rise under the elastic force of the second spring 23, and pushes the reset cylinder 11 to rise. At this time, the limiting plate 31 is located inside the fixing groove 32 and will not affect the rise of the insert 18. When the insert 18 disengages from the insertion port 26, the drive chain can be replaced.

[0036] As a further embodiment of the present invention, a drive motor 14 is fixedly connected inside the outer frame 1, and the output end of the drive motor 14 is fixedly connected to the bottom of the second fixed shaft 27.

[0037] When the above scheme is put into practical use, the drive motor 14 drives a set of transmission gears 13 to rotate, and through the transmission chain 15, several sets of transmission gears 13 rotate synchronously. This ensures that the rotation speed of several transmission gears 13 is the same, and the wear test effect on the transmission chain is the same.

[0038] As a further embodiment of the present invention, the size of the first gear 5 is the same as the size of the second gear 12;

[0039] When the above scheme is put into practical use, the same size ensures that the tension at both ends of the transmission chain is the same after the transmission chain is fixed.

[0040] As a further embodiment of the present invention, the inner walls of the connecting cylinder 20 are all smooth walls, and the sliding cylinder 30 can be completely fitted with the inner wall of the connecting cylinder 20;

[0041] When the above solution is put into actual use, the two parts fit together perfectly, so that the sliding cylinder 30 will not shift in position when it slides up and down outside the connecting cylinder 20, making the sliding more stable.

[0042] As a further embodiment of the present invention, a photoelectric switch 3 is fixedly connected to the upper end of the outer frame 1 on both sides of the connecting groove 2;

[0043] When the above solution is put into actual use, when the transmission chain is worn and stretched, the first fixed shaft 6 will be pulled to slide under the elastic force of the first spring 7. The first fixed shaft 6 will slide to the inside of the photoelectric switch 3, thus blocking the signal of the photoelectric switch 3, thereby completing the signal of transmission chain wear.

[0044] A method for wear testing of a transmission chain before production, the method comprising the following steps:

[0045] Step 1: Connect one end of the experimental transmission chain to the second gear 12 and the other end to the first gear 5;

[0046] Step 2: Fix the second gear 12 onto the second fixed shaft 27 using the rotation adjustment assembly, and fit the first gear 5 onto the first fixed shaft 6. Adjust the first fixed shaft 6 to a suitable distance using the limiting and fixing assembly.

[0047] Step 3: Conduct a wear test on the transmission chain by rotating the second gear 12, which is driven by the rotation of the transmission gear 13.

[0048] Step 4: After the transmission chain wears out, its overall length will be stretched. After stretching, the distance between the first gear 5 and the second gear 12 will increase. At this time, the limiting and fixing component will drive the first fixed shaft 6 to slide and compare with the initial position to complete the recording of the wear of the transmission chain.

[0049] Working principle: One end of the experimental transmission chain is sleeved on the second gear 12, and the other end is sleeved on the first gear 5. The second gear 12 is fixed on the second fixed shaft 27 by a rotation adjustment component. The first gear 5 is sleeved on the first fixed shaft 6. After the first gear 5 is connected to the transmission chain at one end and the other end of the transmission chain is connected and fixed to the second gear 12, the transmission chain is completely straightened by sliding the connecting frame 8 inside the connecting groove 2. After straightening, the connecting frame 8 is continued to slide, so that the first spring 7 is stretched to a certain length. Then, the connecting frame 8 is fixed at this position by the threaded rod 10. In this way, when the transmission chain wears and is stretched, the elastic force of the first spring 7 will pull the first fixed shaft 6 and the first gear 5 to move together. The initial position of the first fixed shaft 6 is recorded. When the first fixed shaft 6 is displaced, it can be determined that the transmission chain has been worn and stretched.

[0050] When one end of the transmission chain is connected to the second gear 12 and the second gear 12 is fixed on the second fixed shaft 27, the second gear 12 is directly sleeved on the connecting cylinder 20 and slid downwards until the convex shaft at the bottom of the second gear 12 is inserted into the alignment port 22. The second gear 12 is then pressed down further, causing the connecting cylinder 20 to compress the second spring 23 and slide downwards. Figure 4-5 As shown, due to the sliding connection between the rotating cylinder 29 and the sliding cylinder 30, the rotation of the second fixed shaft 27 will not affect the connecting cylinder 20. After the sliding limit plate 31 of the second gear 12 extends from the top of the insert block 18, the second gear 12 can be released. Under the elastic force of the second spring 23, the connecting cylinder 20 and the second gear 12 are pushed to slide upward. At this time, the limit plate 31 presses the top of the insert block 18 from inside the fixed groove 32, pushing the insert block 18 to slide along the slide rail 34 and stretch the third spring 36. The insert block 18 will gradually slide along the fixed groove 32 towards the second fixed shaft 27 until the insert block 18 is inserted into the insertion port 26 on the second fixed shaft 27. When the insert block 18 is inserted into the insertion port 26, the rotation of the second fixed shaft 27 will drive the second gear 12 to rotate together, thus completing the transmission from the second fixed shaft 27 to the second gear 12. The wear test is carried out by driving the transmission chain to rotate through the second fixed shaft 27. Finally, the reset cylinder 11 is sleeved on the top of the connecting cylinder 20.

[0051] When the drive chain needs to be replaced due to wear, press down on the reset cylinder 11 so that it contacts the limiting plate 31, and push the limiting plate 31 to slide inward into the fixing groove 32. Then, press down on the second gear 12 through the connecting plate 16 so that the second gear 12 and the connecting cylinder 20 slide down together. When the insert 18 disengages from the limiting plate 31, it will be reset under the elastic force of the third spring 36. At this time, the limiting plate 31 is pressed into the fixing groove 32 by the reset cylinder 11. Slowly release the connecting plate 16 so that the connecting cylinder 20 drives the second gear 12 to rise under the elastic force of the second spring 23, and pushes the reset cylinder 11 to rise. At this time, the limiting plate 31 is located inside the fixing groove 32 and will not affect the rise of the insert 18. When the insert 18 disengages from the insertion port 26, the drive chain can be replaced.

Claims

1. A wear testing device for a transmission chain before production, comprising an outer frame (1), characterized in that: The outer frame (1) is rotatably equipped with a plurality of equally spaced transmission gears (13), which are connected together to a transmission chain (15). A second fixed shaft (27) is fixedly connected to each transmission gear (13), and a second gear (12) is provided on the second fixed shaft (27). A rotation adjustment component is provided on the second fixed shaft (27) to adjust the connection between the second gear (12) and the second fixed shaft (27), so that the second gear (12) can be fixedly connected to the second fixed shaft (27) or rotatably connected to the second fixed shaft (27). A first fixed shaft (6) is provided on the outer frame (1), and a first gear (5) is rotatably connected to the first fixed shaft (6). A limit fixing component is provided at one end of the first fixed shaft (6) to adjust the position of the first fixed shaft (6) according to the length of the transmission chain. The rotation adjustment assembly includes a rotating cylinder (29), which is fixedly sleeved outside the second fixed shaft (27). A sliding cylinder (30) is rotatably connected to the outside of the rotating cylinder (29). Several equidistant limiting plates (31) are rotatably connected to the bottom of the sliding cylinder (30). A torsion spring for resetting is fixedly connected to the limiting plate (31). A connecting cylinder (20) is slidably connected to the outside of the sliding cylinder (30). A fixing groove (32) for aligning with the limiting plate (31) is provided on the connecting cylinder (20). The limiting plate (31) is rotatably connected to the outside of the sliding cylinder (30). 1) One end can pass through the fixing groove (32) and be set on the outside of the connecting cylinder (20). The bottom of the connecting cylinder (20) is fixedly connected to a support plate (21). The support plate (21) has an alignment port (22). The bottom of the second gear (12) is fixedly connected to a convex shaft for mating with the alignment port (22). The bottom end of the connecting cylinder (20) is fixedly connected to a second gasket (33). The bottom of the second gasket (33) is provided with a first gasket (24). The second gasket (33) and the first gasket (24) are both sleeved on the second fixing shaft (27). Externally, a second spring (23) is connected between the second gasket (33) and the first gasket (24). A first limiting plate (25) is fixedly connected to the second fixed shaft (27) at the top of the rotating drum (29). A second limiting plate (28) is fixedly connected to the connecting groove (2) at the bottom of the first gasket (24). A plurality of connecting shafts (17) are fixedly connected to the top of the second gear (12) in an equidistant manner. A connecting disc (16) is rotatably connected to the top of the connecting shaft (17). A plurality of connecting discs (16) are fixedly connected to the top of the second gear (12) in an equidistant manner. Equally spaced fixed blocks (19) are provided. A plug (18) is slidably connected to the top of the fixed block (19). A slide rail (34) is provided on one side of the fixed block (19). A slider (35) is slidably connected inside the slide rail (34). The top of the slider (35) is fixedly connected to the plug (18). A third spring (36) for resetting is fixedly connected to one side of the slider (35). A socket (26) for docking with the plug (18) is provided on the second fixed shaft (27). A reset cylinder (11) is slidably connected to the top of the connecting cylinder (20).

2. The wear testing device for a transmission chain before production as described in claim 1, characterized in that: The limiting and fixing assembly includes a connecting frame (8), which is disposed on one side of the first fixed shaft (6). A connecting groove (2) is provided on the outer frame (1). The connecting frame (8) is slidably disposed inside the connecting groove (2). A first spring (7) is fixedly connected to one end of the connecting frame (8). The other end of the first spring (7) is fixedly connected to the first fixed shaft (6). The bottom of the first fixed shaft (6) is slidably disposed inside the connecting groove (2). A locking plate (9) is fixedly connected to the top of the connecting frame (8). Sliding grooves (4) are provided on the outer frame (1) on both sides of the connecting groove (2). A threaded rod (10) is slidably connected to the locking plate (9). The bottom of the threaded rod (10) is slidably disposed inside the sliding groove (4).

3. The wear testing device for a transmission chain before production as described in claim 1, characterized in that: A drive motor (14) is fixedly connected inside the outer frame (1), and the output end of the drive motor (14) is fixedly connected to the bottom of the second fixed shaft (27).

4. The wear testing device for a transmission chain before production as described in claim 2, characterized in that: The first gear (5) is the same size as the second gear (12).

5. The wear testing device for a transmission chain before production as described in claim 1, characterized in that: The inner walls of the connecting cylinder (20) are all smooth walls, and the sliding cylinder (30) can be completely fitted with the inner wall of the connecting cylinder (20).

6. The wear testing device for a transmission chain before production as described in claim 2, characterized in that: Photoelectric switches (3) are fixedly connected to the upper ends of the outer frames (1) on both sides of the connecting groove (2).

7. A method for testing wear of a transmission chain before production, applicable to the wear testing device for a transmission chain before production as described in any one of claims 1-6, characterized in that, The method includes the following steps: Step 1: Connect one end of the experimental transmission chain to the second gear (12) and the other end to the first gear (5); Step 2: Fix the second gear (12) on the second fixed shaft (27) by rotating the adjustment assembly, and fit the first gear (5) onto the first fixed shaft (6). Adjust the first fixed shaft (6) to a suitable distance by using the limiting and fixing assembly. Step 3: The wear test of the transmission chain is carried out by rotating the transmission gear (13) to drive the second gear (12) to rotate together; Step 4: After the transmission chain wears out, its overall length will be stretched. After stretching, the distance between the first gear (5) and the second gear (12) will increase. At this time, the limiting and fixing component will drive the first fixed shaft (6) to slide and compare the initial position to complete the recording of the wear of the transmission chain.

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