Gear product hardness detection equipment and detection method

Abstract

The invention discloses gear product hardness detection equipment and a detection method, and belongs to the technical field of detection equipment.The gear product hardness detection equipment comprises a bearing platform, supporting legs are fixedly installed at the four corners of the lower end face of the bearing platform, a control panel is fixedly installed on the left side of the upper end face of the bearing platform, and a detection equipment body is fixedly installed on the right side of the upper end face of the bearing platform; a disc is fixedly installed in the middle of the upper end face of the bearing platform. A half gear is arranged on the upper side of the disc. According to the scheme, by arranging the outer clamping mechanism and the inner clamping mechanism, the highly stable fixing effect is provided. The outer clamping mechanism is responsible for externally fixing the half gear to ensure that the outer edge of the half gear is tightly attached to the detection equipment; and the inner clamping mechanism provides support from the inside, and the central part of the gear is stably supported through accurate inner supporting force, so that the accuracy and reliability of hardness detection of the half gear are greatly improved, the problem of detection error or gear damage caused by unstable fixation is avoided, and a solid guarantee is provided for high-quality gear detection.

Description

Technical Field

[0001] The present invention relates to the technical field of testing equipment, and more specifically, to a gear product hardness testing device and a testing method. Background Art

[0002] Gears refer to mechanical components with gears on the wheel rim that continuously mesh to transmit motion and power. The application of gears in transmission has appeared very early. At the end of the 19th century, the principle of gear cutting was developed, and special machine tools and tools for gear cutting based on this principle appeared one after another. With the development of production, the smoothness of gear operation has received attention. After the gear processing is completed, a certain number of gears need to be sampled for hardness testing, usually by directly tapping and observing the changes in the gears from the surface.

[0003] A Chinese patent with the authorization publication number CN216900036U discloses a gear hardness detection device for mechanical processing. The output shaft of the starting motor rotates forward to drive the rotating shaft to rotate forward, which causes the L-shaped rack to move downward and drives the pressure block to move downward to detect the hardness of the gear. When the gear hardness detection is completed, the output shaft of the starting motor is reversed to drive the rotating shaft to reverse, which causes the L-shaped rack to move upward and drives the pressure block to move upward and reset and disengage from the gear. The gear with qualified hardness can be taken out from the stage. When the hardness of the gear is unqualified, the operator lifts up the second handle to drive the stage to move upward and disengage from the fixed plate, and pours the gear with unqualified hardness from the stage into the collection container. In this way, the hardness of the gear can be tested to prevent fragments from scattering on the ground, and the hardness detection is accurate.

[0004] Although the gear hardness testing device for machining can perform hardness testing on gears, poor fixing effect is a common problem in the actual gear hardness testing process, especially for half gears with special structures. If the gear is displaced or shakes during testing, it will not only affect the accuracy of the test results, but may also lead to serious consequences. For example, unstable fixation may cause the gear to be significantly displaced during the test, or even cause the gear to crack, causing equipment damage and safety risks. This problem poses a major challenge to the reliability of the test results and the safety of the equipment. It is urgent to improve the design of the fixing device to ensure the stability and safety of the gear during the entire testing process, thereby improving the detection accuracy and protecting the equipment from damage. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a gear product hardness testing device, which can provide a relatively stable fixing effect for special gear structures.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A gear product hardness testing device comprises a bearing platform, wherein support legs are fixedly installed at the four corners of the lower end surface of the bearing platform, a control panel is fixedly installed on the left side of the upper end surface of the bearing platform, a testing device body is fixedly installed on the right side of the upper end surface of the bearing platform, a disc is fixedly installed in the middle of the upper end surface of the bearing platform, a half gear is arranged on the upper side of the disc, an outer clamping mechanism is arranged on the outer side of the half gear, an inner clamping mechanism is arranged on the inner side of the half gear, an extension fixing mechanism and a card and fixing mechanism are arranged on the lower side of the half gear, the outer clamping mechanism comprises a telescopic rod fixedly installed on the upper end surface of the disc, a lifting plate is fixedly installed on the upper end surface of the telescopic rod, the half gear is placed on the upper side of the lifting plate, a guide cavity 1 is opened inside the disc, a pull rope is slidably connected inside the guide cavity 1, a slide groove 1 is connected to the right side of the guide cavity 1, a slide plate 1 is slidably connected inside the slide groove 1, one end of the pull rope is fixedly connected to the slide plate 1, and the other end of the pull rope is fixedly connected to the lifting plate.

[0008] A spring is fixedly installed between the slide plate 1 and the inner wall of the slide groove 1, a clamping plate 1 is arranged on the outer side of the half gear, and the clamping plate 1 is fixedly connected to the slide plate 1. The external clamping mechanism is provided with three groups and is dispersedly arranged in a ring shape.

[0009] The inner clamping mechanism includes a slot 1 opened on the upper end surface of the half gear, an insertion rod 1 is fixedly installed on the upper end surface of the disc corresponding to the slot 1, a sliding groove 2 is opened inside the insertion rod 1, a slide plate 2 is slidably connected inside the slide groove 2, and the slide plate 2 is fixedly connected to the lifting plate.

[0010] An airbag is fixedly installed between the lower end surface of the second slide plate and the inner wall of the second slide groove, a sealed cavity is opened inside the lifting plate, and a connecting cavity is provided between the sealed cavity and the airbag.

[0011] A sliding groove three is provided on the upper end surface of the lifting plate, and the sliding groove three is communicated with the sealing chamber. A connecting rod is slidably connected inside the sliding groove three, and a piston plate is slidably connected inside the sealing chamber. A clamping plate two is provided on the inner side of the half gear, one end of the connecting rod is fixedly connected to the clamping plate two, and the other end of the connecting rod is fixedly connected to the piston plate. The internal clamping mechanism is provided in three groups and is dispersedly arranged in a ring shape.

[0012] The extension fixing mechanism includes a second slide plate having a memory alloy fixedly mounted on its upper end surface, a storage cavity is provided on the inner upper side of the first insertion rod, two groups of the storage cavities are provided and are symmetrically arranged, and an extension plate is slidably connected to the interior of the storage cavity.

[0013] A second guiding cavity is provided between the receiving cavity and the second slide groove, the memory alloy is slidably connected inside the second guiding cavity, and one end of the memory alloy is Y-shaped and extends to the inside of the receiving cavity and is fixedly connected to the extension plate.

[0014] The card and fixing mechanism includes a notch at the outer edge of the lifting plate, a support plate is arranged at the lower side of the notch, the support plate is fixedly connected to the disc, a slide rail is fixedly installed on the upper end of the support plate, and the slide rail is arranged inside the notch.

[0015] The slide rail is internally slidably connected with a slider, one end of the slider is fixedly installed with a transmission rod, the groove is internally fixedly installed with a fixed shaft, the transmission rod is rotatably connected with the fixed shaft, one side of the upper end surface of the transmission rod is fixedly installed with a second insertion rod, the outer surface of the half gear is provided with a second slot corresponding to the second insertion rod, and the card and fixing mechanism are provided in three groups and are dispersedly arranged in a ring shape.

[0016] A method for testing a gear product hardness testing device comprises the following steps: S1: External fixation: The telescopic rod drives the lifting plate to rise and drives the external clamping mechanism to operate, externally clamping and fixing the half gear to provide a preliminary fixing effect; S2: Internal fixation: The lifting plate rises and synchronously drives the internal clamping mechanism to operate, so that the internal clamping mechanism can fix the hollow hole of the half gear internally and cooperate with the external clamping mechanism to form a stable internal and external fixing effect; S3: Extension and fixation: When the half gear is placed, the first plug rod will be inserted into the inside of the first slot for preliminary limiting, and then the memory alloy will be driven to rise with the assistance of the internal clamping mechanism, so that the two sets of extension plates will be extended, and the first plug rod will be firmly fixed inside the first slot, thereby locking the half gear; S4: Carding and fixing: The lifting plate is raised while driving the carding and fixing mechanism to operate, insert the second plug rod into the second slot, and cooperate with the extended fixing mechanism to complete the carding and locking of the half gear, thereby improving the fixing effect.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) This solution provides a highly stable fixing effect by setting up an external clamping mechanism and an internal clamping mechanism. The external clamping mechanism is responsible for externally fixing the half gear to ensure that its outer edge fits tightly against the testing equipment; while the internal clamping mechanism provides support from the inside, and the center of the gear is firmly supported through precise internal support force. This design greatly improves the accuracy and reliability of half-gear hardness testing, avoids detection errors or gear damage caused by unstable fixing, and provides a solid guarantee for high-quality gear testing.

[0018] (2) This solution ensures the stable connection of the half gear inside the testing equipment by setting up an extension fixing mechanism and a snap-fit ​​fixing mechanism, effectively preventing vertical displacement. The extension fixing mechanism provides additional support, while the snap-fit ​​fixing mechanism accurately locks the gear position. The two work together to ensure the absolute stability of the gear during the testing process, thereby improving the accuracy and safety of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 The enlarged schematic diagram at A in the middle; Figure 4 For the present invention Figure 2 The enlarged schematic diagram of point B in the middle; Figure 5 For the present invention Figure 2 The enlarged schematic diagram at C in the middle; Figure 6 is a cross-sectional view of the extension fixing mechanism of the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic diagram at point D in the middle.

[0020] Description of the numbers in the figure: 1. Support platform; 2. Control panel; 3. Support leg; 4. Main body of testing equipment; 5. Disc; 6. Half gear; 7. Telescopic rod; 8. Lifting disc; 9. Pull rope; 10. Guide cavity 1; 11. Slide groove 1; 12. Slide plate 1; 13. Clamp plate 1; 14. Slot 1; 15. Insert rod 1; 16. Slide groove 2; 17. Slide plate 2; 18. Airbag; 19. Connecting cavity; 20. Sealing cavity; 21. Piston plate; 22. Slide groove 3; 23. Connecting rod; 24. Clamp plate 2; 25. Memory alloy; 26. Storage cavity; 27. Extension plate; 28. Guide cavity 2; 29. ​​Notch; 30. Support plate; 31. Slide rail; 32. Slider; 33. Transmission rod; 34. Insert rod 2; 35. Fixed shaft; 36. Slot 2; 37. Spring. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0022] See also Figures 1 to 7A gear product hardness testing device comprises a base 1, support legs 3 are fixedly installed at the four corners of the lower end surface of the base 1, a control panel 2 is fixedly installed on the left side of the upper end surface of the base 1, a testing device body 4 is fixedly installed on the right side of the upper end surface of the base 1, a disc 5 is fixedly installed in the middle of the upper end surface of the base 1, a half gear 6 is arranged on the upper side of the disc 5, an outer clamping mechanism is arranged on the outer side of the half gear 6, an inner clamping mechanism is arranged on the inner side of the half gear 6, and an extension fixing mechanism and a card and fixing mechanism are arranged on the lower side of the half gear 6 The outer clamping mechanism includes a telescopic rod 7 fixedly mounted on the upper end surface of the disc 5, a lifting plate 8 is fixedly mounted on the upper end surface of the telescopic rod 7, the half gear 6 is placed on the upper side of the lifting plate 8, a guide cavity 10 is opened inside the disc 5, a pull rope 9 is slidably connected inside the guide cavity 10, a slide groove 11 is connected on the right side of the guide cavity 10, a slide plate 12 is slidably connected inside the slide groove 11, one end of the pull rope 9 is fixedly connected to the slide plate 12, and the other end of the pull rope 9 is fixedly connected to the lifting plate 8.

[0023] In the actual gear hardness test process, poor fixing effect is a common problem, especially for the special structure of the half gear 6. If the gear is displaced or shaken during the test, it will not only affect the accuracy of the test results, but also may lead to serious consequences. For example, unstable fixation may cause the gear to be significantly displaced during the test process, or even cause the gear to crack, causing equipment damage and safety risks. This problem poses a major challenge to the reliability of the test results and the safety of the equipment. It is urgent to improve the design of the fixing device to ensure the stability and safety of the gear during the entire test process, thereby improving the test accuracy and protecting the equipment from damage. Therefore, this solution provides a highly stable fixing effect by setting an external clamping mechanism and an internal clamping mechanism. The external clamping mechanism is responsible for externally fixing the half gear 6 to ensure that its outer edge fits the test equipment tightly; while the internal clamping mechanism provides support from the inside, and the center of the gear is firmly supported through precise internal support force. This design greatly improves the accuracy and reliability of the hardness test of the half gear 6, avoids the test error or gear damage caused by unstable fixation, and provides a solid guarantee for high-quality gear testing.

[0024] A spring 37 is fixedly installed between the slide plate 12 and the inner wall of the slide groove 11, a clamping plate 13 is arranged on the outer side of the half gear 6, and the clamping plate 13 is fixedly connected to the slide plate 12. There are three groups of external clamping mechanisms, which are dispersedly arranged in a ring shape.

[0025] First, align the slot 14 on the half gear 6 with the insertion rod 15 on the fixed plate and insert and place them, then drive the telescopic rod 7 to make the lifting plate 8 rise, and the lifting plate 8 will synchronously carry one end of the pull rope 9 to rise, and the other end of the pull rope 9 is fixedly connected to the slide plate 12 that is slidably connected inside the slide groove 11, so that the slide plate 12 will be driven to slide inward inside the slide groove 11, and the slide plate 12 will synchronously drive the splint 13 to move toward the half gear 6, and the three groups of splints 13 will synchronously move toward the half gear 6, so as to enhance the stable external clamping effect of the half gear 6, and the setting of the spring 37 is to enhance the reset effect so that the pull rope 9 and the splint 13 can return to their original positions.

[0026] The inner clamping mechanism includes a slot 14 formed on the upper end surface of the half gear 6, an insertion rod 15 is fixedly installed on the upper end surface of the disc 5 corresponding to the slot 14, a slide groove 2 16 is formed inside the insertion rod 15, a slide plate 2 17 is slidably connected inside the slide groove 2 16, and the slide plate 2 17 is fixedly connected to the lifting plate 8.

[0027] An airbag 18 is fixedly installed between the lower end surface of the second slide plate 17 and the inner wall of the second slide groove 16 . A sealed cavity 20 is opened inside the lifting plate 8 . A connecting cavity 19 is provided between the sealed cavity 20 and the airbag 18 .

[0028] A slide groove three 22 is provided on the upper end surface of the lifting plate 8, and the slide groove three 22 is communicated with the sealing chamber 20, and a connecting rod 23 is slidably connected inside the slide groove three 22, and a piston plate 21 is slidably connected inside the sealing chamber 20. A clamping plate two 24 is provided on the inner side of the half gear 6, one end of the connecting rod 23 is fixedly connected to the clamping plate two 24, and the other end of the connecting rod 23 is fixedly connected to the piston plate 21. There are three groups of internal clamping mechanisms, which are dispersedly arranged in a ring shape.

[0029] Secondly, the rise of the lifting plate 8 will drive the slide plate 2 17 to slide up inside the slide groove 2 16, thereby expanding the airbag 18 and sucking the gas inside the sealing chamber 20 through the connecting chamber 19, so that the piston plate 21 carries the connecting rod 23 to move outward inside the sealing chamber 20, and the clamp plate 24 fixedly installed at the other end of the connecting rod 23 moves outward synchronously and fits tightly against the inner wall of the hollow hole inside the half gear 6. The three groups of clamp plates 24 move synchronously for internal support and fixation, and cooperate with the external clamping mechanism to enhance greater stability.

[0030] The extension fixing mechanism includes a memory alloy 25 fixedly mounted on the upper end surface of the slide plate 2 17 , a receiving cavity 26 is opened on the inner upper side of the insertion rod 15 , and two groups of receiving cavities 26 are arranged symmetrically, and an extension plate 27 is slidably connected to the interior of the receiving cavity 26 .

[0031] A second guide cavity 28 is provided between the receiving cavity 26 and the second slide groove 16 , and the memory alloy 25 is slidably connected inside the second guide cavity 28 , and one end of the memory alloy 25 is Y-shaped and extends to the inside of the receiving cavity 26 and is fixedly connected to the extension plate 27 .

[0032] Secondly, the sliding plate 2 17 rises, which drives the memory alloy 25 to rise, and pushes the two groups of extension plates 27 at the other end of the memory alloy 25 to extend out from the inside of their respective storage chambers 26, and cooperates with the half gear 6 in the rising state to clamp the extension plate 27 on the upper side of the slot 1 14, thereby completing the clamping and fixing effect of the half gear 6.

[0033] The card and fixing mechanism includes a slot 29 at the outer edge of the lifting plate 8, a support plate 30 is arranged on the lower side of the slot 29, the support plate 30 is fixedly connected to the disc 5, and a slide rail 31 is fixedly installed on the upper end of the support plate 30, and the slide rail 31 is arranged inside the slot 29.

[0034] A slider 32 is slidably connected inside the slide rail 31, a transmission rod 33 is fixedly installed at one end of the slider 32, a fixed shaft 35 is fixedly installed inside the groove 29, the transmission rod 33 is rotatably connected to the fixed shaft 35, a second plug rod 34 is fixedly installed on one side of the upper end surface of the transmission rod 33, and a second slot 36 is provided on the outer surface of the half gear 6 corresponding to the second plug rod 34. There are three groups of card and fixing mechanisms, which are dispersedly arranged in a ring shape.

[0035] When the lifting plate 8 rises, the fixed shaft 35 inside the slot 29 and the transmission rod 33 rotatably connected to the fixed shaft 35 will rise, and the slider 32 fixedly installed at one end of the transmission rod 33 will slide inside the arc-shaped slide rail 31. Therefore, as the transmission rod 33 rises, the slider 32 will move along the trajectory of the slide rail 31, thereby driving the transmission rod 33 to deflect around the fixed shaft 35, so that the insertion rod 2 34 on the other end of the transmission rod 33 is inserted into the slot 2 36 on the half gear 6, and cooperates with the extended fixing mechanism to provide a complete clamping fixing effect. After the fixing is completed, the detection equipment body 4 can be driven by the control panel 2 to perform hardness detection on the half gear 6.

[0036] This solution ensures the stable connection of the half gear 6 inside the detection device by setting an extension fixing mechanism and a snap-fit ​​fixing mechanism, effectively preventing vertical displacement. The extension fixing mechanism provides additional support, while the snap-fit ​​fixing mechanism accurately locks the gear position. The two work together to ensure the absolute stability of the gear during the detection process, improving the accuracy and safety of the detection.

[0037] A method for testing a gear product hardness testing device comprises the following steps: S1: External fixation: The telescopic rod 7 drives the lifting plate 8 to rise, and drives the external clamping mechanism to operate, externally clamping and fixing the half gear 6 to provide a preliminary fixing effect; S2: Internal fixation: The lifting plate 8 rises, and the internal clamping mechanism is driven to operate synchronously, so that the internal clamping mechanism fixes the hollow hole of the half gear 6 internally, and cooperates with the external clamping mechanism to form a stable internal and external fixing effect; S3: Extension and fixation: When the half gear 6 is placed, the insertion rod 15 is inserted into the slot 14 for preliminary positioning, and then the memory alloy 25 is driven to rise with the assistance of the internal clamping mechanism, so that the two sets of extension plates 27 are extended, and the insertion rod 15 is firmly fixed in the slot 14, thereby locking the half gear 6; S4: locking and fixing: while the lifting plate 8 rises, the locking and fixing mechanism is driven to operate, the second insertion rod 34 is inserted into the second slot 36, and the extended fixing mechanism is cooperated to complete the locking and locking of the half gear 6, thereby improving the fixing effect.

[0038] Method of use: First, align the slot 14 on the half gear 6 with the insertion rod 15 on the fixed plate and insert and place it, then drive the telescopic rod 7 to make the lifting plate 8 rise, and the lifting plate 8 will synchronously carry one end of the pull rope 9 to rise, and the other end of the pull rope 9 is fixedly connected to the slide plate 12 that is slidably connected inside the slide groove 11, so that the slide plate 12 will be driven to slide inward inside the slide groove 11, and the slide plate 12 will synchronously drive the clamping plate 13 to move toward the half gear 6, and the three groups of clamping plates 13 will synchronously move toward the half gear 6, so as to enhance the stable external clamping effect of the half gear 6, and the setting of the spring 37 is to enhance the reset effect so that the pull rope 9 and the clamping plate 13 can return to their original positions; Secondly, the lifting plate 8 rises and drives the second slide plate 17 to slide up inside the second slide groove 16, thereby expanding the airbag 18 and sucking the gas inside the sealing chamber 20 through the connecting chamber 19, so that the piston plate 21 carries the connecting rod 23 to move outward inside the sealing chamber 20, and the second clamping plate 24 fixedly installed at the other end of the connecting rod 23 moves outward synchronously and adheres to the inner wall of the hollow hole inside the half gear 6. The three groups of second clamping plates 24 move synchronously to perform internal support and fixation, and cooperate with the external clamping mechanism to enhance strong stability; Secondly, the sliding plate 2 17 rises, driving the memory alloy 25 to rise, and pushing the two groups of extension plates 27 at the other end of the memory alloy 25 to extend out from the inside of their respective storage chambers 26, and cooperate with the half gear 6 in the rising state to clamp the extension plate 27 on the upper side of the slot 1 14, completing the clamping and fixing effect of the half gear 6; Secondly, when the lifting plate 8 rises, the fixed shaft 35 inside the slot 29 and the transmission rod 33 rotatably connected to the fixed shaft 35 will rise, and the slider 32 fixedly installed at one end of the transmission rod 33 will slide inside the arc-shaped slide rail 31. Therefore, as the transmission rod 33 rises, the slider 32 will move along the trajectory of the slide rail 31, thereby driving the transmission rod 33 to deflect around the fixed shaft 35, so that the insertion rod 2 34 on the other end of the transmission rod 33 is inserted into the slot 2 36 on the half gear 6, and cooperates with the extended fixing mechanism to provide a complete clamping fixing effect. After the fixing is completed, the detection equipment body 4 can be driven by the control panel 2 to perform hardness detection on the half gear 6.

[0039] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gear product hardness testing device, comprising a support platform (1), wherein support legs (3) are fixedly mounted at four corners of the lower end surface of the support platform (1), characterized in that: A control panel (2) is fixedly mounted on the left side of the upper end surface of the support platform (1), a detection device body (4) is fixedly mounted on the right side of the upper end surface of the support platform (1), a disc (5) is fixedly mounted in the middle of the upper end surface of the support platform (1), a half gear (6) is arranged on the upper side of the disc (5), an outer clamping mechanism is arranged on the outer side of the half gear (6), an inner clamping mechanism is arranged on the inner side of the half gear (6), an extension fixing mechanism and a card fixing mechanism are arranged on the lower side of the half gear (6), the outer clamping mechanism comprises a fixedly mounted on the upper end surface of the disc (5), and a clamping mechanism is arranged on the inner side of the half gear (6). A telescopic rod (7), a lifting plate (8) is fixedly mounted on the upper end surface of the telescopic rod (7), the half gear (6) is placed on the upper side of the lifting plate (8), a guide cavity (10) is provided inside the disc (5), a pull rope (9) is slidably connected inside the guide cavity (10), a slide groove (11) is provided on the right side of the guide cavity (10), a slide plate (12) is slidably connected inside the slide groove (11), one end of the pull rope (9) is fixedly connected to the slide plate (12), and the other end of the pull rope (9) is fixedly connected to the lifting plate (8).

2. The gear product hardness testing device according to claim 1, characterized in that: A spring (37) is fixedly installed between the slide plate 1 (12) and the inner wall of the slide groove 1 (11), a clamping plate 1 (13) is arranged on the outer side of the half gear (6), and the clamping plate 1 (13) is fixedly connected to the slide plate 1 (12). The external clamping mechanism is provided in three groups and is dispersedly arranged in a ring shape.

3. The gear product hardness testing device according to claim 2 is characterized in that: The inner clamping mechanism comprises a slot 1 (14) formed on the upper end surface of the half gear (6); an insertion rod 1 (15) is fixedly mounted on the upper end surface of the disc (5) corresponding to the slot 1 (14); a slide groove 2 (16) is formed inside the insertion rod 1 (15); a slide plate 2 (17) is slidably connected inside the slide groove 2 (16); and the slide plate 2 (17) is fixedly connected to the lifting disc (8).

4. The gear product hardness testing device according to claim 3 is characterized in that: An air bag (18) is fixedly installed between the lower end surface of the second slide plate (17) and the inner wall of the second slide groove (16); a sealed cavity (20) is provided inside the lifting plate (8); and a connecting cavity (19) is provided between the sealed cavity (20) and the air bag (18).

5. The gear product hardness testing device according to claim 4, characterized in that: A third slide groove (22) is provided on the upper end surface of the lifting plate (8), and the third slide groove (22) is communicated with the sealing chamber (20). A connecting rod (23) is slidably connected inside the third slide groove (22), and a piston plate (21) is slidably connected inside the sealing chamber (20). A second clamping plate (24) is provided on the inner side of the half gear (6), one end of the connecting rod (23) is fixedly connected to the second clamping plate (24), and the other end of the connecting rod (23) is fixedly connected to the piston plate (21). The internal clamping mechanism is provided in three groups and is dispersedly arranged in a ring shape.

6. The gear product hardness testing device according to claim 5, characterized in that: The extension fixing mechanism comprises a second slide plate (17) having a memory alloy (25) fixedly mounted on its upper end surface, the first insertion rod (15) having a storage cavity (26) formed on its inner upper side, the storage cavity (26) being provided with two groups and symmetrically arranged, and an extension plate (27) being slidably connected to the interior of the storage cavity (26).

7. The gear product hardness testing device according to claim 6, characterized in that: A second guide cavity (28) is provided between the receiving cavity (26) and the second slide groove (16), the memory alloy (25) is slidably connected inside the second guide cavity (28), and one end of the memory alloy (25) is arranged in a Y shape and extends to the inside of the receiving cavity (26) and is fixedly connected to the extension plate (27).

8. The gear product hardness testing device according to claim 7, characterized in that: The clamping and fixing mechanism comprises a notch (29) formed at the outer edge of the lifting plate (8), a support plate (30) being provided at the lower side of the notch (29), the support plate (30) being fixedly connected to the disc (5), a slide rail (31) being fixedly mounted at the upper end of the support plate (30), and the slide rail (31) being arranged inside the notch (29).

9. The gear product hardness testing device according to claim 8, characterized in that: The slide rail (31) is slidably connected to a slider (32) inside, a transmission rod (33) is fixedly mounted on one end of the slider (32), a fixed shaft (35) is fixedly mounted inside the notch (29), the transmission rod (33) is rotatably connected to the fixed shaft (35), a second insertion rod (34) is fixedly mounted on one side of the upper end surface of the transmission rod (33), a second slot (36) is formed on the outer surface of the half gear (6) corresponding to the second insertion rod (34), and the card and fixing mechanism is provided in three groups and is dispersedly arranged in a ring shape.

10. A method for testing the hardness of a gear product according to claims 1 to 9, characterized in that: The steps include: S1: External fixation: The telescopic rod (7) drives the lifting plate (8) to rise, and drives the external clamping mechanism to operate, externally clamping and fixing the half gear (6), providing a preliminary fixing effect; S2: Internal fixation: The lifting plate (8) rises, and synchronously drives the internal clamping mechanism to operate, so that the internal clamping mechanism internally supports and fixes the hollow hole of the half gear (6), and cooperates with the external clamping mechanism to form a stable internal and external fixing effect; S3: Extension and fixation: When the half gear (6) is placed, the first insertion rod (15) is inserted into the interior of the first slot (14) to perform preliminary positioning, and then the memory alloy (25) is driven upward with the assistance of the internal clamping mechanism, so that the two sets of extension plates (27) are extended, and the first insertion rod (15) is firmly fixed inside the first slot (14), thereby locking the half gear (6); S4: locking and fixing: the lifting plate (8) is raised while driving the locking and fixing mechanism to operate, inserting the second insertion rod (34) into the second slot (36), and cooperating with the extension fixing mechanism to complete the locking and locking of the half gear (6), thereby improving the fixing effect.

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