A device for testing the elongation of the film of an aged enameled aluminum wire

Abstract

This invention relates to the field of enameled aluminum wire testing technology and discloses a device for testing the elongation rate of the coating after aging of enameled aluminum wire. The device includes a base and a frame fixedly mounted on the top surface of the base. A test plate is slidably mounted on the inner wall of the frame. Tooling fixtures are provided on both the inner top surface of the frame and the top surface of the test plate. A drive structure for driving the test plate is provided on the frame. Two mounting seats are symmetrically fixedly mounted on the inner top surface of the frame. This invention achieves precise adjustment of the mounting plate height through a threaded transmission structure of a threaded sleeve and an adjusting screw. Combined with the slot limiting during the movement of the rotating sleeve, it ensures that the mounting plate always corresponds to the center position of the tooling fixture during feeding. Simultaneously, the gravity traction of the counterweight and the magnetic drive of the centering component automatically center and align the enameled aluminum wire sample, avoiding premature core wire breakage due to clamping misalignment or clamping distance deviation, reducing test data errors, and accurately reflecting the actual elongation rate of the coating after aging.

Description

Technical Field

[0001] This invention relates to the field of enameled aluminum wire testing technology, and in particular to a device for testing the elongation of the coating of enameled aluminum wire after aging. Background Technology

[0002] Enameled aluminum wire, with its advantages of lightweight and low cost, is widely used in the winding manufacturing of electrical equipment such as motors, transformers, and relays. The flexibility and anti-aging ability of its insulation film directly determine the service life of the equipment. During long-term service, enameled aluminum wire is subjected to environmental effects such as high temperature, humidity, and chemical corrosion, which can easily cause the film to become brittle and crack. The elongation of the film is a core indicator for evaluating its performance after aging.

[0003] In the clamping stage of the elongation test of the coating after aging of enameled aluminum wire, the staff needs to accurately place and fix the aged enameled aluminum wire sample between the two end fixtures. However, in actual operation, due to factors such as differences in manual clamping techniques and unclear fixture positioning references, it is easy for the actual clamping distance between the two ends of the enameled aluminum wire on the fixture to deviate. This clamping distance deviation will cause uneven stress on the sample during the subsequent tensile test. The end with shorter distance will bear greater tensile stress, which will not only cause the aluminum wire core or coating at that end to break prematurely, but also cause the test data of coating elongation to deviate from the true value, failing to accurately reflect the actual extensibility of the enameled aluminum wire coating after aging. At the same time, the premature breakage of the sample will cause the test process to be interrupted, increasing the time cost and material loss of repeated tests, seriously affecting the accuracy, stability and efficiency of the entire test work.

[0004] Therefore, it is necessary to design a device for testing the elongation rate of the coating after aging of enameled aluminum wire to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a device for testing the elongation rate of the coating film after aging of enameled aluminum wire.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A device for testing the elongation rate of enameled aluminum wire after aging includes a base and a frame fixedly mounted on the top surface of the base. A test plate is slidably mounted on the inner wall of the frame. Tooling fixtures are provided on both the inner top surface of the frame and the top surface of the test plate. A drive structure for driving the test plate is provided on the frame. Two mounting seats are symmetrically fixedly mounted on the inner top surface of the frame. A rotating sleeve is provided on the inner wall of the mounting seat. An adjusting screw is provided on the inner wall of the rotating sleeve. A mounting plate is fixedly mounted on the bottom end of the adjusting screw. A connecting plate is fixedly mounted between the opposite sides of the two mounting plates. An installation assembly is provided between the mounting seats, the rotating sleeve, and the adjusting screw. A feeding assembly for adapting to the tooling fixtures is provided on the side of the mounting plate. A centering assembly for aligning the enameled aluminum wire is provided on the side of the frame.

[0007] As a preferred embodiment of the present invention, the mounting assembly includes a shaft rotatably mounted on the inner wall of the mounting base, a rotating sleeve fixedly mounted on the outer wall of the shaft, torsion springs mounted on both ends of the shaft, and the two ends of the torsion springs being fixedly connected to the mounting base and the shaft, respectively. A guide plate is fixedly mounted on the inner wall of the mounting base, and three slots adapted to the outer wall of the rotating sleeve are provided on the side of the guide plate.

[0008] As a preferred embodiment of the present invention, the guide plate is made of rubber material, and the guide plate is arc-shaped with the center of the arc coaxial with the shaft.

[0009] As a preferred embodiment of the present invention, the inner wall of the rotating sleeve is symmetrically provided with two sliding grooves, the top end of the adjusting screw is symmetrically fixedly installed with two sliders that are slidably connected to the sliding grooves, and the bottom end of the rotating sleeve is rotatably installed with a threaded sleeve that is screwed to the adjusting screw.

[0010] As a preferred embodiment of the present invention, the feeding assembly includes a mounting sleeve rotatably mounted on the side of a mounting plate. A support rod is slidably mounted on the inner wall of the mounting sleeve, and one end of the support rod passes through the side of the mounting plate. A clamping plate is fixedly mounted on the end of the support rod away from the mounting plate. A counterweight is fixedly mounted on the outer wall of the mounting sleeve. A magnetic sheet is fixedly mounted on both the outer wall of the mounting sleeve and the bottom surface of the counterweight. A spring is fitted on the end of the support rod away from the clamping plate, and the two ends of the spring are fixedly connected to the mounting plate and the support rod, respectively.

[0011] As a preferred embodiment of the present invention, the cross-sectional shape of the clamping plate is a right trapezoid.

[0012] As a preferred embodiment of the present invention, the centering component includes two telescopic damping rods symmetrically fixedly installed on the side of the frame. A vertical plate is fixedly installed at the bottom end of the telescopic damping rod. A guide opening is provided on the side of the vertical plate. Two guide strips corresponding to the guide opening are fixedly installed on the side of the vertical plate.

[0013] As a preferred embodiment of the present invention, the guide opening is arc-shaped and the center of the arc is coaxial with the shaft, and the two guide strips are arranged in a figure-eight shape.

[0014] As a preferred embodiment of the present invention, the centering component further includes four guide frames respectively fixedly installed on the sides of the two upright plates. A sliding plate is slidably installed on the inner wall of the guide frame. A lifting plate is fixedly installed between the ends of the two sliding plates located at the same end. Two springs are symmetrically fixedly installed on the side of the lifting plate. A finding plate is fixedly installed at the end of the spring. A fixing plate is fixedly installed on the side of the guide frame. A spring is fixedly installed between the fixing plate and the side of the lifting plate. A magnetic sheet is fixedly installed at the end of the sliding plate away from the lifting plate.

[0015] As a preferred embodiment of the present invention, the magnetic poles of magnetic sheet one and magnetic sheet two are opposite.

[0016] The present invention has the following beneficial effects: 1. In this invention, the threaded transmission structure of the threaded sleeve and the adjusting screw enables precise adjustment of the mounting plate height. Combined with the slot limit during the movement of the rotating sleeve, it ensures that the mounting plate always corresponds to the center position of the tooling fixture during feeding. At the same time, with the help of the gravity traction of the counterweight and the magnetic drive of the centering component, the enameled aluminum wire sample is automatically centered and aligned, avoiding the problem of premature core wire breakage caused by clamping misalignment or clamping distance deviation, reducing test data error, and accurately reflecting the actual elongation of the film after aging. 2. In this invention, a spring-driven flexible clamping structure is adopted. The elastic force of the spring is used to achieve adaptive clamping of the sample, avoiding deformation of the aluminum wire core or damage to the coating caused by rigid clamping. The counterweight always maintains a vertical downward posture, which can keep the sample in a vertical and suspended state throughout the clamping process, preventing the clamping effect from being affected by the bending of the sample. At the same time, it can adapt to the clamping requirements of different specifications of enameled aluminum wire, improving the adaptability of the device to aluminum wire substrate. 3. In this invention, the rotating sleeve's rotating feeding design allows the operator to rotate the mounting plate out of the frame to place the sample. Combined with the elastic reset structure of the shaft and torsion spring, the rotating sleeve can be quickly reset. The slot limit function of each operating position provides stable support for clamping, adjustment and other steps without the need for additional auxiliary fixing. The automatic centering function of the centering component eliminates the step of manually adjusting the sample position, shortens the clamping time, and improves the convenience and efficiency of the overall testing process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the device for testing the elongation of the coating film after aging of enameled aluminum wire proposed in this invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the device for testing the elongation of the coating film after aging of enameled aluminum wire proposed in this invention. Figure 2 ; Figure 3 This is a schematic diagram of the frame structure of a device for testing the elongation rate of enameled aluminum wire after aging, as proposed in this invention. Figure 4 This is a schematic diagram of the rotating sleeve and adjusting screw structure of a device for testing the elongation rate of enameled aluminum wire after aging, as proposed in this invention. Figure 5 This is an exploded structural diagram of the mounting base, rotating sleeve, and adjusting screw of the elongation test device for the film elongation rate of enameled aluminum wire after aging, as proposed in this invention. Figure 6 for Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the overall structure of the vertical plate of the elongation test device for the film elongation rate of enameled aluminum wire after aging, as proposed in this invention. Figure 8 for Figure 7 Enlarged structural diagram at point B.

[0018] In the diagram: 11. Base; 12. Frame; 13. Test plate; 14. Tooling fixture; 15. Drive structure; 21. Mounting base; 22. Rotating sleeve; 23. Adjusting screw; 24. Mounting plate; 25. Connecting plate; 31. Shaft; 32. Torsion spring; 33. Guide plate; 34. Slot; 35. Slide groove; 36. Slider; 37. Threaded sleeve; 41. Mounting sleeve; 42. Support rod; 43. Clamping plate; 44. Counterweight; 45. Magnetic sheet one; 46. Spring one; 51. Telescopic damping rod; 52. Vertical plate; 53. Guide opening; 54. Guide strip; 61. Guide frame; 62. Slide plate; 63. Lifting plate; 64. Spring two; 65. Finding plate; 66. Fixing plate; 67. Spring three; 68. Magnetic sheet two. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1: This example describes a device for testing the elongation of the coating of enameled aluminum wire after aging, as disclosed in this example. Figure 1-8The system includes a base 11 and a frame 12 fixedly installed on the top surface of the base 11. A test plate 13 is slidably installed on the inner wall of the frame 12. Tooling fixtures 14 are provided on both the inner top surface of the frame 12 and the top surface of the test plate 13. A drive structure 15 for driving the test plate 13 is provided on the frame 12. Two mounting seats 21 are symmetrically fixedly installed on the inner top surface of the frame 12. A rotating sleeve 22 is provided on the inner wall of the mounting seat 21. An adjusting screw 23 is provided on the inner wall of the rotating sleeve 22. A mounting plate 24 is fixedly installed at the bottom end of the adjusting screw 23. A connecting plate 25 is fixedly installed between the opposite sides of the two mounting plates 24. An installation assembly is provided between the mounting seat 21, the rotating sleeve 22 and the adjusting screw 23. A feeding assembly for adapting to the tooling fixture 14 for feeding is provided on the side of the mounting plate 24. A centering assembly for aligning the enameled aluminum wire is provided on the side of the frame 12. The mounting assembly includes a shaft 31 rotatably mounted on the inner wall of the mounting base 21, a rotating sleeve 22 fixedly mounted on the outer wall of the shaft 31, torsion springs 32 mounted on both ends of the shaft 31, and the two ends of the torsion springs 32 are fixedly connected to the mounting base 21 and the shaft 31 respectively. A guide plate 33 is fixedly mounted on the inner wall of the mounting base 21. The guide plate 33 is made of rubber material and is arc-shaped with the center of the arc coaxial with the shaft 31. Three slots 34 adapted to the outer wall of the rotating sleeve 22 are opened on the side of the guide plate 33. Two sliding grooves 35 are symmetrically opened on the inner wall of the rotating sleeve 22. Two sliders 36 slidably connected to the sliding grooves 35 are symmetrically fixedly mounted on the top of the adjusting screw 23. A threaded sleeve 37 screwed to the adjusting screw 23 is rotatably mounted on the bottom of the rotating sleeve 22.

[0021] The implementation principle of this embodiment is as follows: In the actual operation stage of the enameled aluminum wire film elongation test device after aging, the operator needs to first adjust the installation height of the test plate 13 precisely according to the length parameters of the enameled aluminum wire sample to be tested, so that the length between the two tooling fixtures 14 can correspond to the enameled aluminum wire to be tested. After the adjustment is completed, the threaded sleeve 37 equipped with the device needs to be rotated. Since the threaded sleeve 37 and the adjusting screw 23 are threadedly connected, and the adjusting screw 23 forms a sliding connection relationship with the slider 36 structure and the rotating sleeve 22 through the preset sliding groove 35, during the rotation of the threaded sleeve 37, the adjusting screw 23 will be driven to slide smoothly along the axis of the rotating sleeve 22 through the thread transmission action, thereby driving the mounting plate 24 connected to the adjusting screw 23 to complete the height adjustment until the mounting plate 24 is in a vertical downward state and can accurately correspond to the center position between the two tooling fixtures 14. After the height is adjusted to the correct position, the operator can begin clamping the enameled aluminum wire sample. During clamping, first pull the rotating sleeve 22 outwards, causing it to rotate the adjusting screw 23 and mounting plate 24 to the outside of the frame 12. Once the mounting plate 24 is completely rotated out of the frame 12, the operator can place the enameled aluminum wire sample to be tested stably on the feeding components on the sides of the two mounting plates 24. The sample is initially fixed using the clamping structure of the feeding components. Then, the rotating sleeve 22 is pushed back towards the frame 12. During the reverse movement of the rotating sleeve 22, aided by the elastic reset action of the shaft 31 and torsion spring 32, the integrated centering component automatically centers and aligns the enameled aluminum wire sample on the feeding components, ensuring that the center position of the sample precisely coincides with the center reference line of the feeding components. When the rotating sleeve 22 moves to a vertical position, both ends of the enameled aluminum wire sample will precisely extend into the inner clamping areas of the two tooling fixtures 14. At this point, the operator can directly operate... The tooling fixture 14 securely fixes both ends of the sample. After fixing, the rotating sleeve 22 is pushed further into the frame 12, causing the feeding assembly to move synchronously, so that the feeding assembly is completely separated from the enameled aluminum wire sample. This completes the sample clamping preparation. Then, the drive structure 15 built into the base 11 can be activated. The drive structure 15 drives the test plate 13 to move at a preset speed, thereby conducting a precise test on the elongation of the film after aging of the enameled aluminum wire. In addition, during the entire movement operation of the rotating sleeve 22, when it is at the highest point outside the frame 12, in the vertical clamping position, and in the test preparation position after being pushed to separate from the enameled aluminum wire sample, the outer wall of the rotating sleeve 22 can precisely engage with the preset slot 34 structure inside the mounting base 21. The limiting effect of the slot 34 achieves temporary fixation of the rotating sleeve 22, thereby providing stable support conditions for manual operation at each stage and improving the convenience and accuracy of clamping and testing operations.

[0022] Example 2: Based on Example 1, this example discloses a device for testing the elongation of the coating of enameled aluminum wire after aging, such as... Figure 4 As shown, the feeding assembly includes a mounting sleeve 41 rotatably mounted on the side of the mounting plate 24. A support rod 42 is slidably mounted on the inner wall of the mounting sleeve 41, and one end of the support rod 42 passes through the side of the mounting plate 24. A clamping plate 43 is fixedly mounted on the end of the support rod 42 away from the mounting plate 24. The cross-sectional shape of the clamping plate 43 is a right trapezoid. A counterweight 44 is fixedly mounted on the outer wall of the mounting sleeve 41. A magnetic sheet 45 is fixedly mounted on both the outer wall of the mounting sleeve 41 and the bottom surface of the counterweight 44. A spring 46 is fitted on the end of the support rod 42 away from the clamping plate 43, and the two ends of the spring 46 are fixedly connected to the mounting plate 24 and the support rod 42, respectively.

[0023] The implementation principle of this embodiment is as follows: During the rotation of the rotating sleeve 22 towards the outside of the frame 12 via the shaft 31, the mounting sleeve 41, which is rotatably connected to the mounting plate 24, moves synchronously. A counterweight 44 is specially mounted on the mounting sleeve 41. The counterweight 44, due to its own continuous weight, maintains a stable vertically downward position and will not change its vertical orientation with the rotation of the rotating sleeve 22. When the rotating sleeve 22 drives the mounting plate 24 to the preset loading position, the operator can directly place the enameled aluminum wire sample to be tested between the two clamps 43 on the mounting plate 24. At this time, the spring at the end of the support rod 42... The 46 releases an elastic force, driving the two clamping plates 43 to move towards each other and tightly adhere to the outer wall of the enameled aluminum wire, achieving rapid and flexible clamping of the sample and avoiding damage to the aluminum wire core or coating due to excessive clamping force. At the same time, under the vertical downward traction of the counterweight 44, the enameled aluminum wire sample clamped by the clamping plates 43 can always maintain a vertical hanging state, and will not be tilted or bent due to the rotation angle deviation of the rotating sleeve 22 or the uneven weight distribution of the sample itself. This ensures that the two ends of the sample can accurately correspond to the clamping area of ​​the tooling fixture 14 in the subsequent clamping process, laying a solid foundation for improving the accuracy of the coating elongation test.

[0024] Example 3: Based on Example 1, this example discloses a device for testing the elongation of the coating of enameled aluminum wire after aging, such as... Figure 7 and Figure 8 As shown, the centering component includes two telescopic damping rods 51 symmetrically fixedly installed on the sides of the frame 12. A vertical plate 52 is fixedly installed at the bottom end of each telescopic damping rod 51. A guide opening 53 is provided on the side of the vertical plate 52. The guide opening 53 is arc-shaped, and the center of the arc is coaxial with the shaft 31. Two guide strips 54 corresponding to the guide openings 53 are fixedly installed on the side of the vertical plate 52. The two guide strips 54 are arranged in a V-shape. The centering component also includes four guide frames 61 respectively fixedly installed on the sides of the two vertical plates 52. A sliding plate 62 is slidably installed on the inner wall. A lifting plate 63 is fixedly installed between the ends of the two sliding plates 62 located at the same end. Two springs 64 are symmetrically fixedly installed on the side of the lifting plate 63. A flat plate 65 is fixedly installed at the end of the springs 64. A fixing plate 66 is fixedly installed on the side of the guide frame 61. A spring 67 is fixedly installed between the fixing plate 66 and the side of the lifting plate 63. A magnetic sheet 68 is fixedly installed at the end of the sliding plate 62 away from the lifting plate 63. The magnetic poles of the magnetic sheet 45 and the magnetic sheet 68 are opposite.

[0025] The implementation principle of this embodiment is as follows: During the process of the mounting plate 24 completing the height adjustment and rotating outward with the rotating sleeve 22, the mounting sleeve 41 on the side of the mounting plate 24 can be accurately embedded into the pre-set guide opening 53 on the side of the upright plate 52 through the guide strip 54, and the outer wall of the mounting sleeve 41 is adapted to the inner wall of the guide opening 53, and can slide smoothly along the extension direction of the guide opening 53. At the same time, the mounting sleeve 41 will pull the telescopic damping rod 51 connected to it in the process of entering the guide opening 53. The elastic extension and contraction of the telescopic damping rod 51 is used to compensate for the height difference after the mounting plate 24 is adjusted, so that the position of the upright plate 52 can adapt to the height change of the mounting plate 24, ensuring that the two always maintain a good fit. After the staff places the enameled aluminum wire sample to be tested between the clamping plates 43 and completes the initial clamping, the rotating sleeve 22 needs to be pushed in the opposite direction to move it back to the inside of the frame 12. During the process of the mounting sleeve 41 sliding in the opposite direction along the guide port 53, the magnetic plate 45 preset on the mounting sleeve 41 and the counterweight 44 will gradually move to the position opposite to the magnetic plate 68 on the upright plate 52. Since the magnetic poles of the magnetic plate 45 and the magnetic plate 68 are opposite, they will generate a magnetic force that attracts each other. Under the driving action of this magnetic force, the sliding plate 62 connected to the magnetic plate 68 will move along... The guide frame 61 slides smoothly along its track, simultaneously driving the lifting plates 63 on both sides to move towards each other. This, in turn, pushes the bottom of the lifting plate 63 to move towards the enameled aluminum wire. Through the limiting and pushing action of the bottom plate 65, the enameled aluminum wire sample slides slowly between the clamping plates 43, ultimately aligning the center position of the sample precisely with the center reference line of the clamping plates 43. This ensures that when the rotating sleeve 22 moves in the opposite direction to the vertical working position, both ends of the enameled aluminum wire can precisely correspond to the clamping area of ​​the tooling fixture 14, achieving precise clamping for subsequent tensile testing.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for testing the elongation rate of enameled aluminum wire after aging, comprising a base (11) and a frame (12) fixedly installed on the top surface of the base (11), wherein a test plate (13) is slidably installed on the inner wall of the frame (12), and tooling fixtures (14) are provided on both the inner top surface of the frame (12) and the top surface of the test plate (13), and a driving structure (15) for driving the test plate (13) to perform the test is provided on the frame (12), characterized in that, Two mounting seats (21) are symmetrically fixedly installed on the inner top surface of the frame (12). A rotating sleeve (22) is provided on the inner wall of the mounting seat (21). An adjusting screw (23) is provided on the inner wall of the rotating sleeve (22). A mounting plate (24) is fixedly installed at the bottom end of the adjusting screw (23). A connecting plate (25) is fixedly installed between the opposite sides of the two mounting plates (24). An installation assembly is provided between the mounting seat (21), the rotating sleeve (22) and the adjusting screw (23). A feeding assembly for adapting to the tooling fixture (14) is provided on the side of the mounting plate (24). A centering assembly for aligning the enameled aluminum wire is provided on the side of the frame (12).

2. The device for testing the elongation rate of enameled aluminum wire after aging according to claim 1, characterized in that, The mounting assembly includes a shaft (31) rotatably mounted on the inner wall of the mounting base (21), a rotating sleeve (22) fixedly mounted on the outer wall of the shaft (31), torsion springs (32) mounted on both ends of the shaft (31), and the two ends of the torsion springs (32) are fixedly connected to the mounting base (21) and the shaft (31) respectively. A guide plate (33) is fixedly mounted on the inner wall of the mounting base (21), and three slots (34) adapted to the outer wall of the rotating sleeve (22) are provided on the side of the guide plate (33).

3. The device for testing the elongation rate of the coating film after aging of enameled aluminum wire according to claim 2, characterized in that, The guide plate (33) is made of rubber material. The guide plate (33) is arc-shaped and the center of the arc is coaxial with the shaft (31).

4. The device for testing the elongation rate of the coating film after aging of enameled aluminum wire according to claim 2, characterized in that, The inner wall of the rotating sleeve (22) has two symmetrically opened sliding grooves (35). The top end of the adjusting screw (23) is symmetrically fixed with two sliders (36) that are slidably connected to the sliding grooves (35). The bottom end of the rotating sleeve (22) is rotatably installed with a threaded sleeve (37) that is screwed to the adjusting screw (23).

5. The device for testing the elongation rate of the coating film after aging of enameled aluminum wire according to claim 2, characterized in that, The feeding assembly includes a mounting sleeve (41) rotatably mounted on the side of the mounting plate (24). A support rod (42) is slidably mounted on the inner wall of the mounting sleeve (41), and one end of the support rod (42) passes through the side of the mounting plate (24). A clamping plate (43) is fixedly mounted on the end of the support rod (42) away from the mounting plate (24). A counterweight (44) is fixedly mounted on the outer wall of the mounting sleeve (41). A magnetic sheet (45) is fixedly mounted on both the outer wall of the mounting sleeve (41) and the bottom surface of the counterweight (44). A spring (46) is fitted on the end of the support rod (42) away from the clamping plate (43), and the two ends of the spring (46) are fixedly connected to the mounting plate (24) and the support rod (42) respectively.

6. The device for testing the elongation rate of enameled aluminum wire after aging according to claim 5, characterized in that, The cross-sectional shape of the clamp (43) is a right trapezoid.

7. The device for testing the elongation rate of the coating film after aging of enameled aluminum wire according to claim 5, characterized in that, The centering component includes two telescopic damping rods (51) symmetrically fixedly installed on the side of the frame (12). A vertical plate (52) is fixedly installed at the bottom end of the telescopic damping rod (51). A guide opening (53) is opened on the side of the vertical plate (52). Two guide strips (54) corresponding to the guide opening (53) are fixedly installed on the side of the vertical plate (52).

8. The device for testing the elongation of the coating of enameled aluminum wire after aging according to claim 7, characterized in that, The guide opening (53) is arc-shaped and the center of the arc is coaxial with the shaft (31). The two guide bars (54) are arranged in a figure-eight shape.

9. The device for testing the elongation of the coating of enameled aluminum wire after aging according to claim 7, characterized in that, The centering component also includes four guide frames (61) fixedly installed on the sides of the two upright plates (52). A sliding plate (62) is slidably installed on the inner wall of the guide frame (61). A lifting plate (63) is fixedly installed between the ends of the two sliding plates (62) located at the same end. Two springs (64) are symmetrically fixedly installed on the side of the lifting plate (63). A finding plate (65) is fixedly installed at the end of the spring (64). A fixing plate (66) is fixedly installed on the side of the guide frame (61). A spring (67) is fixedly installed between the fixing plate (66) and the side of the lifting plate (63). A magnetic sheet (68) is fixedly installed at the end of the sliding plate (62) away from the lifting plate (63).

10. The device for testing the elongation of the coating of enameled aluminum wire after aging according to claim 9, characterized in that, The magnetic poles of magnetic sheet one (45) and magnetic sheet two (68) are opposite.

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