A silicon nitride ceramic bearing ball detection device

Abstract

The application discloses a kind of silicon nitride ceramic bearing ball detection devices, including box, upper clamping disc and lower clamping disc, still include multiple sliding tubes, each sliding tube is slidably provided with probe, sliding tube is slidably provided with push block, push block and probe are provided with pressure spring, the both ends of pressure spring are fixedly connected with push block and probe, when the bearing ball of different size is detected, so that multiple probes can be abutted with bearing ball, and after abutment, multiple sliding tubes are fixed by lifting assembly, and the abutment force between probe and bearing ball is limited, so that it not only can detect the multiple positions of different size bearing ball, but also make the abutment force between each position probe and bearing ball same, not only improve the detection efficiency of bearing ball, also improve detection accuracy.

Description

Technical Field

[0001] This invention relates to the field of bearing ball testing technology, and specifically to a silicon nitride ceramic bearing ball testing device. Background Technology

[0002] Silicon nitride ceramic bearing balls are high-performance bearing components made primarily of silicon nitride, and they possess advantages such as high hardness, corrosion resistance, and high temperature resistance.

[0003] To ensure the service life and reliability of bearing balls during application, it is necessary to test and evaluate the performance of bearing balls during the research and development stage. In the existing technology, it is difficult to test multiple points of bearing balls simultaneously, and it is also inconvenient to test bearing balls of different sizes. Summary of the Invention

[0004] The purpose of this invention is to provide a silicon nitride ceramic bearing ball testing device to overcome the above-mentioned shortcomings in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A silicon nitride ceramic bearing ball testing device includes a housing, an upper clamping plate and a lower clamping plate, and also includes multiple sliding tubes. Each sliding tube is slidably equipped with a probe, and a push block is slidably equipped on the sliding tube. A pressure spring is provided between the push block and the probe, and the two ends of the pressure spring are fixedly connected to the push block and the probe, respectively.

[0007] Multiple support rods are fixedly installed on the box body, and the multiple support rods correspond one-to-one with multiple sliding tubes and are slidably connected;

[0008] It also includes a lifting assembly, which, after the bearing ball comes into contact with multiple probes, causes the push block to slide, compresses the pressure spring, and limits the sliding tube;

[0009] The limiting component limits the probe during the sliding of the push block, and releases the limiting component on the probe when the push block completes its sliding.

[0010] Preferably, an abutment spring is provided between the sliding tube and the support rod. The two ends of the abutment spring are fixedly connected to the sliding tube and the support rod, respectively. The abutment spring is used to make the probe abut against the bearing ball during the placement of the bearing ball and to reset the sliding tube after the test.

[0011] Preferably, a pressure plate is slidably disposed on the sliding tube, a protrusion is fixedly disposed on the pressure plate, and an inclined groove is disposed on the push block, with the protrusion slidably disposed in the inclined groove.

[0012] Preferably, a return spring is provided between the push block and the sliding tube, and the two ends of the return spring are fixedly connected to the push block and the sliding tube respectively. The return spring is used to reset the push block and the pressure plate.

[0013] Preferably, the limiting component includes a limiting rod slidably disposed on the sliding tube, a limiting block fixedly disposed on the limiting rod, a limiting groove disposed on the probe, the limiting block engaging with the limiting groove, and the limiting rod abutting against the pressure plate.

[0014] Preferably, a limiting spring is provided between the limiting rod and the sliding tube, and the two ends of the limiting spring are fixedly connected to the limiting rod and the sliding tube, respectively.

[0015] Preferably, the lifting assembly includes a lifting rod slidably disposed on the housing, and a plurality of second friction plates are fixedly disposed on the lifting rod, the plurality of second friction plates corresponding one-to-one with a plurality of pressure plates and engaging in abutment cooperation;

[0016] A pressing spring is provided between the lifting rod and the housing. The two ends of the pressing spring are fixedly connected to the lifting rod and the housing, respectively. The pressing spring is used to press the pressure plate when the upper clamping plate moves down.

[0017] Preferably, a lifting seat is rotatably mounted on the lower clamping plate, and a base is fixedly mounted on the housing, with the lifting seat and the base being slidably connected.

[0018] A support spring is provided between the lifting seat and the base, and the two ends of the support spring are fixedly connected to the lifting seat and the base, respectively.

[0019] Preferably, a plurality of guide columns are fixedly provided on the housing, a vertical rod is slidably provided on the guide columns, an abutment pin is fixedly provided on the vertical rod, a first friction plate is fixedly provided on the lifting seat, and the abutment pin is in frictional contact with the first friction plate.

[0020] Preferably, a rotating ring is rotatably provided on the upper clamping plate, and a top plate is fixedly provided on the rotating ring. The top plate is sleeved on the lifting rod and abuts against the lifting rod.

[0021] A guide rod is fixedly mounted on the rotating ring, a guide block is fixedly mounted on the guide rod, a guide groove is provided on the vertical rod, and the guide block is slidably mounted in the guide groove. The guide groove includes an inclined part and a vertical part.

[0022] In the above technical solution, the silicon nitride ceramic bearing ball detection device provided by the present invention has the following beneficial effects:

[0023] By installing probes on multiple sliding tubes, multiple probes can contact the bearing balls of different sizes during testing. After contact, the sliding tubes are limited and fixed by a lifting assembly, while the pressure spring is limited by the sliding of a push block. The limiting assembly then releases the probe's limitation, so the force of the pressure spring acts directly on the probe, creating a certain contact force between the probe and the bearing ball. This allows for testing of multiple positions on bearing balls of different sizes, and ensures that the contact force between the probe and the bearing ball is the same at each position. This improves both the efficiency and accuracy of bearing ball testing.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0025] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a schematic diagram of the overall internal structure of the box provided in an embodiment of the present invention;

[0028] Figure 2 Provided for embodiments of the present invention Figure 1 Enlarged view of point A in the image;

[0029] Figure 3 This is a schematic diagram of a sliding tube structure provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the pusher block structure provided in an embodiment of the present invention;

[0031] Figure 5 Provided for embodiments of the present invention Figure 1 Enlarged view of point B in the image;

[0032] Figure 6 This is a schematic diagram of the upper clamping disk structure provided in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the lower clamping disk structure provided in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Housing; 11. Base; 12. Guide column; 13. Motor; 14. Polygonal rod; 15. Electric telescopic rod; 16. Connecting plate; 17. Support rod; 2. Upper clamping plate; 21. Rotating ring; 22. Guide rod; 23. Guide block; 24. Top plate; 3. Lower clamping plate; 31. Lifting seat; 32. First friction plate; 33. Support spring; 4. Vertical rod; 41. Abutment pin; 42. Guide groove; 5. Lifting rod; 51. Second friction plate; 52. Pressing spring; 6. Sliding tube; 61. Probe; 62. Pressure plate; 63. Protrusion; 64. Limiting groove; 65. Abutment spring; 7. Push block; 71. Inclined groove; 72. Pressure spring; 73. Reset spring; 8. Limiting rod; 81. Limiting block; 82. Limiting spring. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0037] Please refer to 1-7. A silicon nitride ceramic bearing ball testing device includes a housing 1, an upper clamping plate 2, and a lower clamping plate 3. It also includes multiple sliding tubes 6, each with a probe 61 slidably mounted on it. A push block 7 is slidably mounted on each sliding tube 6, and a pressure spring 72 is positioned between the push block 7 and the probe 61. The two ends of the pressure spring 72 are fixedly connected to the push block 7 and the probe 61, respectively. Multiple support rods 17 are fixedly mounted on the housing 1, each support rod 17 corresponding to and slidably connected to one of the multiple sliding tubes 6. The system includes a lifting assembly that, after the bearing ball abuts against multiple probes 61, causes the push block 7 to slide, compressing the pressure spring 72 and limiting the sliding tube 6; a limiting assembly that limits the probes 61 during the sliding of the push block 7, and releases the limiting of the probes 61 when the push block 7 completes its sliding. By setting multiple support rods 17 and sliding tubes 6 slidably mounted on the support rods 17, when the bearing ball is placed on the lower clamping plate 3, the bearing ball contacts the multiple probes 61, and under the pushing action of the bearing ball, the probes 61... 1. The sliding tube 6 is pushed to slide, so that multiple probes 61 can contact the bearing balls when testing bearing balls of different sizes. After the bearing balls are placed, the sliding tube 6 is limited and fixed by the lifting assembly, and the push block 7 slides at the same time. Due to the limitation of the probe 61 by the limiting assembly, the push block 7 compresses the pressure spring 72 when it slides. After the push block 7 completes its sliding, that is, after the pressure spring 72 has completed its compression, the limiting assembly releases the limitation of the probe 61. At this time, the elastic force of the pressure spring 72 directly acts on the probe 61, increasing the contact force between the probe 61 and the bearing ball, so as to facilitate the testing of the friction resistance of the bearing ball. When the bearings are of different sizes, the probe 61 can contact the bearing ball. Under the action of the lifting assembly, the pressure springs 72 on multiple probes 61 are compressed by an equal amount, so that although multiple probes 61 are testing different positions of the bearing ball, their contact force with the bearing ball is the same, so as to test the friction resistance of the bearing ball during the bearing rotation process.

[0038] Specifically, a retaining spring 65 is provided between the sliding tube 6 and the support rod 17. The two ends of the retaining spring 65 are fixedly connected to the sliding tube 6 and the support rod 17, respectively. The retaining spring 65 is used to ensure that the probe 61 abuts against the bearing ball during the placement of the bearing ball, and to reset the sliding tube 6 after the test. When the bearing ball is placed on the lower clamping plate 3, it pushes the sliding tube 6 to slide, compressing the retaining spring 65. This reaction force of the retaining spring 65 ensures that the probe 61 on the sliding tube 6 is in contact with the bearing ball. The sliding is limited and fixed by the lifting assembly, so that the reaction force of the compressed retaining spring 65 will not act on the probe 61 through the sliding tube 6. This avoids the phenomenon that the sliding distance of multiple sliding tubes 6 is different due to the different sizes of the bearing balls, resulting in different degrees of compression of the retaining spring 65 and different abutting forces between the probe 61 and the bearing ball. After the bearing ball is removed after testing, the retaining spring 65 pushes the sliding tube 6 to reset, improving the portability of the bearing ball testing process.

[0039] In a further embodiment of the present invention, a pressure plate 62 is slidably disposed on the sliding tube 6, a protrusion 63 is fixedly disposed on the pressure plate 62, and a groove 71 is disposed on the push block 7. The protrusion 63 is slidably disposed in the groove 71. When the bearing ball pushes the sliding tube 6 to slide, and under the action of the abutment spring 65, when the probes 61 on each sliding tube 6 abut against the bearing ball, the lifting assembly restricts the lateral sliding of the pressure plate 62, thereby restricting the sliding of the sliding tube 6 and pushing the pressure plate 62 to move downward. Because the sliding of the sliding tube 6 is restricted, when the pressure plate 62 moves downward, the push block 7 is pushed to slide through the cooperation of the protrusion 63 and the groove 71, compressing the pressure spring 72.

[0040] Furthermore, a return spring 73 is provided between the push block 7 and the sliding tube 6. The two ends of the return spring 73 are fixedly connected to the push block 7 and the sliding tube 6, respectively. The return spring 73 is used to reset the push block 7 and the pressure plate 62. When the pressure plate moves down and the push block 7 slides to compress the pressure spring 72, the return spring 73 extends. After the bearing ball has been tested and the lifting assembly is separated from the pressure plate 62, the push block 7, the pressure plate 62, and the pressure spring 72 are reset under the action of the return spring 73. Even if the bearing ball wears during the bearing ball rotation test, causing the probe 61 to extend a certain displacement under the action of the pressure spring 72, the return spring 73 can still be used to reset the push rod, the pressure plate 62, the pressure spring 72, and the probe 61 after the bearing ball test is completed.

[0041] Furthermore, the limiting component includes a limiting rod 8 slidably mounted on the sliding tube 6, a limiting block 81 fixedly mounted on the limiting rod 8, a limiting groove 64 mounted on the probe 61, the limiting block 81 engaging with the limiting groove 64, and the limiting rod 8 abutting against the pressure plate 62. A limiting spring 82 is provided between the limiting rod 8 and the sliding tube 6, with both ends of the limiting spring 82 fixedly connected to the limiting rod 8 and the sliding tube 6, respectively. Under the action of the limiting spring 82, the limiting block 81 on the limiting rod 8 engages with the limiting groove 64, fixing and limiting the probe 61, and ensuring the stability of the probe 61 before and during the compression process of the pressure spring 72.

[0042] In a further embodiment of the present invention, the lifting assembly includes a lifting rod 5 slidably disposed on a housing 1. Multiple second friction plates 51 are fixedly disposed on the lifting rod 5, each corresponding to and abutting against multiple pressure plates 62. A pressing spring 52 is disposed between the lifting rod 5 and the housing 1. The two ends of the pressing spring 52 are fixedly connected to the lifting rod 5 and the housing 1, respectively. The pressing spring 52 is used to press the pressure plates 62 when the upper clamping plate 2 moves downward. When the lifting rod 5 descends, the second friction plates 51 rub against the corresponding pressure plates 62, causing the pressure plates 62 to move downward. The protrusion 63 and the inclined groove 71 compress the pressing spring 72. When the second friction plates 51 rub against the corresponding pressure plates 62, because the pressure plates 62 and the sliding tube 6 are vertically slidably connected, the lifting rod 5 can press against the pressure plates 62 through the frictional contact between the second friction plates 51 and the pressure plates 62. The lateral sliding of the sliding tube 6 is restricted, and during the downward movement, the pressure plate 62 moves downward relative to the sliding tube 6, compressing the pressure spring 72. Furthermore, as the second friction plate 51 moves downward with the pressure plate 62, the pressure plate 62 abuts against the limiting rod 8, pushing the limiting rod 8 downward and compressing the limiting spring 82. When the pressure spring 72 is fully compressed, the limiting rod 8 moves downward until the limiting block 81 disengages from the limiting groove 64, and the probe 61 is no longer restricted. At this time, the pressure spring 72 acts on the probe 61, increasing the contact force between the probe 61 and the bearing ball. The increased contact force between the probe 61 and the bearing ball during bearing ball rotation detection means that the greater the contact force between the probe 61 and the bearing ball, the greater the friction. As mentioned in this paper, the contact force between each probe 61 and the bearing ball is the same, meaning that the friction force between each probe 61 and the bearing ball is the same when the bearing ball rotates.

[0043] In the embodiments provided by the present invention, a lifting seat 31 is rotatably mounted on the lower clamping plate 3, and a base 11 is fixedly mounted on the housing 1. The lifting seat 31 and the base 11 are slidably connected. A support spring 33 is provided between the lifting seat 31 and the base 11. The two ends of the support spring 33 are fixedly connected to the lifting seat 31 and the base 11, respectively. When the bearing ball is being tested, the bearing ball is placed on the lower clamping plate 3. Under the action of the weight of the bearing ball, the lower clamping plate 3 and the lifting seat 31 move downward. At the same time, the support spring 33 is compressed. Since the larger the volume of the bearing ball, the greater its weight, the greater the compression distance of the support spring 33, so that the middle part of the bearing ball is positioned so that it tends to face multiple probes 61, which facilitates the testing and improves the testing effect of bearing balls of different sizes.

[0044] Specifically, multiple guide posts 12 are fixedly installed on the housing 1, vertical rods 4 are slidably installed on the guide posts 12, and abutment pins 41 are fixedly installed on the vertical rods 4. A first friction plate 32 is fixedly installed on the lifting seat 31. The abutment pin 41 and the first friction plate 32 are in frictional contact. After the lifting seat 31 and the lower clamping plate 3 move down, the vertical rod 4 slides to make the abutment pin 41 abut against the first friction plate 32 on the lifting seat 31, thereby limiting and fixing the height of the lower clamping plate 3, and improving the portability of adjusting and fixing the height of the lower clamping plate 3.

[0045] In a further embodiment of the present invention, a rotating ring 21 is rotatably mounted on the upper clamping disc 2, and a top plate 24 is fixedly mounted on the rotating ring 21. The top plate 24 is sleeved on the lifting rod 5 and abuts against the lifting rod 5. A guide rod 22 is fixedly mounted on the rotating ring 21, and a guide block 23 is fixedly mounted on the guide rod 22. A guide groove 42 is provided on the vertical rod 4, and the guide block 23 is slidably mounted in the guide groove 42. The guide groove 42 includes an inclined portion and a vertical portion. When the upper clamping disc 2 moves downward to clamp the bearing ball, the rotating ring 21 moves downward along with the top plate 24 and the guide rod 22. The downward movement of the guide rod 22 causes the guide block 23 to move downward. Guide block 23 engages with the inclined portion of guide groove 42, allowing vertical rod 4 to slide on guide post 12. Abutment pin 41 abuts against first friction plate 32, limiting and fixing the height of lifting seat 31 and lower clamping plate 3. After abutment pin 41 abuts against first friction plate 32, guide block 23 enters the vertical portion of guide groove 42, limiting vertical rod 4 and allowing upper clamping plate 2 to continuously move downward. When top plate 24 is not moving downward, pressing spring 52 is in a compressed state. When top plate 24 moves downward, pressing spring 52 causes lifting rod 5 to move downward, thereby realizing the pressing of second friction plate 51 against pressure plate 62.

[0046] A motor 13 and an electric telescopic rod 15 are fixedly installed on the housing 1. A polygonal rod 14 is fixedly installed on the output shaft of the motor 13. The polygonal rod 14 is slidably connected to the upper clamping plate 2. A connecting plate 16 is fixedly installed at the telescopic end of the electric telescopic rod 15. The connecting plate 16 is rotatably connected to the upper clamping plate 2. The electric telescopic rod 15 controls the lifting and lowering of the upper clamping plate 2, thereby achieving the clamping effect on the bearing ball. Regardless of the lifting and lowering distance of the upper clamping plate 2, the motor 13 can drive the upper clamping plate 2, the bearing ball, and the lower clamping plate 3 to rotate through the polygonal rod 14.

[0047] Working principle: When testing the bearing ball, the bearing ball is placed on the lower clamping plate 3. Under the gravity of the bearing ball, the lower clamping plate 3 and the lifting seat 31 move downward, compressing the support spring 33. This allows the middle area of ​​bearing balls of different sizes to correspond to multiple probes 61. During the placement of the bearing ball, the bearing ball, under its own gravity, pushes the sliding tube 6 to slide, compressing the abutment spring 65. During this process, the abutment spring 65 causes the probes 61 on the sliding tube 6 to contact the bearing ball, and then the electrical... The telescopic rod 15 extends, causing the upper clamping plate 2 to move downwards. Simultaneously, the rotating ring 21, guide rod 22, and top plate 24 move downwards. During the downward movement of the guide rod 22, the guide block 23 engages with the inclined portion of the guide groove 42, causing the vertical rod 4 to slide. The abutment pin 41 abuts against the first friction plate 32, limiting the height of the lifting seat 31 and the lower clamping plate 3. At the same time, the top plate 24 moves downwards, releasing the restriction on the lifting rod 5. Under the action of the pressing spring 52, the lifting rod 5 and the second friction plate 51 move downwards, and the second friction plate... The friction pad 51 rubs against the corresponding pressure plate 62, restricting the sliding of the sliding tube 6. The second friction pad 51 presses down on the pressure plate 62, causing it to move downwards. During this downward movement, the push block 7 slides through the cooperation of the protrusion 63 and the inclined groove 71, compressing the pressure spring 72. The return spring 73 stretches. When the pressure plate 62 completes its downward movement, i.e., when the pressure spring 72 is fully compressed, the pressure plate 62 presses down on the limiting rod 8, causing it to slide and disengage the limiting block 81 from the limiting groove 64. At this point, the pressure spring... The force of 72 acts on the probe 61, creating a certain contact force between the probe 61 and the bearing ball. Then, the upper clamping plate 2 continues to move downward, cooperating with the lower clamping plate 3 to clamp and fix the bearing ball. Subsequently, the motor 13 starts and drives the upper clamping plate 2, the bearing ball, and the lower clamping plate 3 to rotate through the polygonal rod 14. The wear resistance of the bearing ball is tested by the friction between the probe 61 and the bearing ball during rotation. In addition, multiple probes 61 are in contact with the bearing ball, and multiple positions of the bearing ball are detected simultaneously.

[0048] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A silicon nitride ceramic bearing ball testing device, comprising a housing (1), an upper clamping plate (2), and a lower clamping plate (3), characterized in that, It also includes multiple sliding tubes (6), each of which is slidably provided with a probe (61), and a push block (7) is slidably provided on the sliding tube (6). A pressure spring (72) is provided between the push block (7) and the probe (61), and the two ends of the pressure spring (72) are fixedly connected to the push block (7) and the probe (61) respectively. Multiple support rods (17) are fixedly installed on the box body (1), and the multiple support rods (17) correspond one-to-one with multiple sliding tubes (6) and are slidably connected; It also includes a lifting assembly, which, after the bearing ball comes into contact with multiple probes (61), causes the push block (7) to slide, compresses the pressure spring (72), and limits the sliding tube (6); The limiting component limits the probe (61) during the sliding process of the push block (7), and releases the limiting component on the probe (61) when the push block (7) finishes sliding.

2. The silicon nitride ceramic bearing ball testing device according to claim 1, characterized in that, An abutment spring (65) is provided between the sliding tube (6) and the support rod (17). The two ends of the abutment spring (65) are fixedly connected to the sliding tube (6) and the support rod (17) respectively. The abutment spring (65) is used to make the probe (61) abut against the bearing ball during the placement of the bearing ball, and to reset the sliding tube (6) after the detection.

3. The silicon nitride ceramic bearing ball testing device according to claim 1, characterized in that, A pressure plate (62) is slidably disposed on the sliding tube (6), a protrusion (63) is fixedly disposed on the pressure plate (62), and a groove (71) is disposed on the push block (7), with the protrusion (63) slidably disposed in the groove (71).

4. The silicon nitride ceramic bearing ball detection device according to claim 3, characterized in that, A reset spring (73) is provided between the push block (7) and the sliding tube (6). The two ends of the reset spring (73) are fixedly connected to the push block (7) and the sliding tube (6) respectively. The reset spring (73) is used to reset the push block (7) and the pressure plate (62).

5. The silicon nitride ceramic bearing ball testing device according to claim 3, characterized in that, The limiting component includes a limiting rod (8) slidably disposed on the sliding tube (6), a limiting block (81) fixedly disposed on the limiting rod (8), a limiting groove (64) disposed on the probe (61), the limiting block (81) and the limiting groove (64) engaging and cooperating, and the limiting rod (8) abutting against the pressure plate (62).

6. The silicon nitride ceramic bearing ball testing device according to claim 5, characterized in that, A limiting spring (82) is provided between the limiting rod (8) and the sliding tube (6), and the two ends of the limiting spring (82) are fixedly connected to the limiting rod (8) and the sliding tube (6) respectively.

7. The silicon nitride ceramic bearing ball testing device according to claim 3, characterized in that, The lifting assembly includes a lifting rod (5) slidably disposed on the housing (1), and a plurality of second friction plates (51) are fixedly disposed on the lifting rod (5). The plurality of second friction plates (51) correspond one-to-one with a plurality of pressure plates (62) and abut against each other. A pressing spring (52) is provided between the lifting rod (5) and the box (1). The two ends of the pressing spring (52) are fixedly connected to the lifting rod (5) and the box (1) respectively. The pressing spring (52) is used to press the pressure plate (62) when the upper clamping plate (2) moves down.

8. The silicon nitride ceramic bearing ball testing device according to claim 7, characterized in that, A lifting seat (31) is rotatably mounted on the lower clamping plate (3), and a base (11) is fixedly mounted on the box body (1). The lifting seat (31) and the base (11) are slidably connected. A support spring (33) is provided between the lifting seat (31) and the base (11), and the two ends of the support spring (33) are fixedly connected to the lifting seat (31) and the base (11) respectively.

9. The silicon nitride ceramic bearing ball testing device according to claim 8, characterized in that, Multiple guide posts (12) are fixedly installed on the housing (1), and vertical rods (4) are slidably installed on the guide posts (12). Abutment pins (41) are fixedly installed on the vertical rods (4), and a first friction plate (32) is fixedly installed on the lifting seat (31). The abutment pins (41) and the first friction plate (32) are in frictional contact.

10. A silicon nitride ceramic bearing ball testing device according to claim 9, characterized in that, The upper clamping plate (2) is rotatably provided with a rotating ring (21), and a top plate (24) is fixedly provided on the rotating ring (21). The top plate (24) is sleeved on the lifting rod (5) and abuts against the lifting rod (5). A guide rod (22) is fixedly installed on the rotating ring (21), a guide block (23) is fixedly installed on the guide rod (22), a guide groove (42) is provided on the vertical rod (4), and the guide block (23) is slidably installed in the guide groove (42). The guide groove (42) includes an inclined part and a vertical part.

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