Device for testing axial strain critical performance of superconducting wire

Abstract

The invention discloses a superconducting wire axial strain critical performance testing device, and relates to the technical field of superconducting wire testing. The device specifically comprises a mounting disc, an outer sleeve, an inner sleeve and a measuring module, wherein the outer sleeve is fixed on one side of the mounting disc; the inner sleeve is arranged in the outer sleeve and is rotationally connected to the mounting disc; the measuring module is arranged at one end, far away from the mounting disc, of the inner sleeve and comprises a cylindrical rotating disc fixedly connected with the inner sleeve, a rod-shaped fixed disc rotationally connected with the cylindrical rotating disc and a C-shaped spring, and the C-shaped spring is fixed on the same side of the cylindrical rotating disc and the rod-shaped fixed disc; a superconducting wire can be arranged on the peripheral wall of the C-shaped spring. Through left-right rotation of the cylindrical rotating disc, the C-shaped spring notch is opened or closed, so that the sample surface generates tensile or compressive strain, the effective test area during sample test is improved, meanwhile, the data uniformity of the superconducting wire in the test process is ensured, and positive and negative axial strain is effectively applied to the superconducting wire sample.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting wire testing, and in particular to a superconducting wire axial strain critical performance testing device. Background Art

[0002] Fusion energy, as a clean energy, is one of the energy sources that humans dream of. The Tokamak magnetic confinement nuclear fusion device is a reliable device for generating fusion energy, and the fully superconducting Tokamak is an important guarantee for achieving continuous operation of fusion reactors. Superconducting cables are important components of the Tokamak device, and their technology is a key technology for fusion engineering. Superconducting cables are made of twisted superconducting wires, so the study of the performance of superconducting wires is a very important task.

[0003] In the prior art, a superconducting wire axial strain critical performance test device adopts a U-shaped spring strain loading structure, in which the superconducting wire is fixed on the upper end plane of the U-shaped spring by soldering. If strain is generated on the upper end surface of the U-shaped spring, the superconducting wire will be strained together with the U-shaped spring due to being soldered on the end surface. The structure is simple in design and convenient for strain loading.

[0004] In the high-field magnet test experimental environment, due to space constraints, the volume of the axial strain critical performance test device is limited, affecting the effective test area during sample testing. Therefore, studying the strain loading structure that can provide a larger uniform strain area under the same volume is extremely important for testing the critical performance of superconducting wires / strips. Such research can improve test efficiency, increase the test area, and thus more accurately evaluate the performance of superconducting materials in practical applications.

[0005] Therefore, the present application aims to solve the problem of how to increase the effective test area ratio during sample testing in a small and limited space, while ensuring the uniformity of data of the superconducting wire during the testing process. Summary of the invention

[0006] The main purpose of the present invention is to provide a superconducting wire axial strain critical performance testing device, aiming to increase the effective test area during sample testing and ensure the uniformity of superconducting wire data during the testing process.

[0007] In order to achieve the above object, the present invention provides a superconducting wire axial strain critical performance testing device, comprising:

[0008] Installation disk;

[0009] An outer sleeve, fixed to one side of the mounting plate;

[0010] an inner sleeve, disposed inside the outer sleeve and rotatably connected to the mounting plate; and

[0011] A measuring module is arranged at one end of the inner sleeve away from the mounting plate, the measuring module comprises a cylindrical rotating disk fixedly connected to the inner sleeve, a rod-shaped fixed disk rotatably connected to the cylindrical rotating disk, and a C-shaped spring, one end of the rod-shaped fixed disk is fixed to the outer sleeve, and the C-shaped spring is fixed on the same side of the cylindrical rotating disk and the rod-shaped fixed disk;

[0012] The outer peripheral wall of the C-shaped spring can be provided with a superconducting wire, and both ends of the superconducting wire are led out to the outside of the inner sleeve.

[0013] Furthermore, the C-shaped spring is arranged on a side of the cylindrical rotating disk and the rod-shaped fixed disk close to the mounting disk.

[0014] Furthermore, the superconducting wire is soldered to the outer peripheral wall of the C-shaped spring.

[0015] Furthermore, an upper fixed column and a worm gear device are provided on the mounting plate, one end of the upper fixed column is fixed to the inner sleeve, and the other end is connected to the worm wheel in the worm gear device, so that the upper fixed column and the worm wheel rotate synchronously relative to the mounting plate.

[0016] Furthermore, a current lead is passed through one end of the upper fixing column away from the inner sleeve, and the current lead is connected to the superconducting wire on the outer peripheral wall of the C-shaped spring to form a measurement loop.

[0017] Furthermore, one end of the current lead close to the testing device is crimped with a copper wire, and both ends of the superconducting wire are respectively connected to the corresponding copper wire.

[0018] Furthermore, one end of the outer sleeve away from the mounting plate is fixedly connected to a chassis, and one end of the rod-shaped fixed plate is fixedly connected to the chassis.

[0019] Furthermore, a bushing is provided between the cylindrical rotating disk and the rod-shaped fixed disk, and one end of the bushing is fixedly connected to the chassis.

[0020] Furthermore, a temperature chamber is provided at one end of the inner sleeve close to the measuring module, and a temperature control rod is fixedly connected to one end of the temperature chamber away from the measuring module. The temperature control rod passes through the upper fixed column, and the temperature chamber can approach and cover the measuring module.

[0021] Furthermore, an insulating block is provided between the copper wires, and the temperature control rod passes through the insulating block.

[0022] The above technical solution has the following advantages:

[0023] The present invention applies force to the upper fixed column through a worm gear device, and the upper fixed column applies force to the cylindrical rotating disk through the inner sleeve one and the inner sleeve two, and the cylindrical rotating disk applies force to one end of the C-shaped notch of the C-shaped spring, and the other end of the C-shaped notch is connected to the rod-shaped fixed disk, and the rod-shaped fixed disk, the chassis, the outer sleeve one, the outer sleeve two and the mounting disk are fixedly connected, and the C-shaped spring notch is caused to open or close through the left and right rotation of the cylindrical rotating disk, so that the sample surface generates tensile or compressive strain, thereby increasing the effective test area during sample testing, and ensuring the uniformity of data of the superconducting wire during the test process, effectively applying positive and negative axial strains to the superconducting wire sample, with high strain change resolution, and in the critical current test process, the strain is uniform and stable, and a larger sample strain uniform area is achieved with a smaller device volume, and the testable sample length is greatly increased; the sample strain loading structure is novel in design, reliable contact is achieved at low temperature, and a large current can be passed, with high test accuracy, and the operation is simple when replacing the sample, and the superconducting wire will not be damaged.

[0024] The present invention adopts the transmission method of an inner sleeve, an upper fixed column and a middle fixed column, thereby driving the cylindrical turntable to rotate, making the cylindrical turntable rotate more smoothly, avoiding the method of using a slender rod to transmit torque, thereby causing the slender rod to be strained due to the drive and causing the problem of transmission error. The current lead and the copper wire are both arranged inside the inner sleeve, ensuring that the positions of the current lead and the copper wire will not be affected by the transmission of the inner sleeve, thereby ensuring the stability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0026] Figure 1 It is a schematic diagram of the outer layer structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the middle layer structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the inner layer structure of the present invention;

[0029] Figure 4 It is a schematic diagram of the local structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the explosion structure of the measurement module of the present invention;

[0031] Figure 6 It is a schematic diagram of the local structure of the measurement module of the present invention.

[0032] In the figure: 1. current lead; 2. upper fixing column; 3. worm gear device; 4. mounting plate; 5. outer sleeve 1; 6. outer sleeve 2; 7. chassis; 8. inner sleeve 1; 9. inner sleeve 2; 10. measuring module; 11. rod-shaped fixed plate; 12. pin; 13. C-shaped spring; 14. cylindrical turntable; 15. bushing 1; 16. bushing 2; 17. ring piece 1; 18. ring piece 2; 19. insulating sheet; 20. temperature chamber rod; 21. temperature chamber; 22. copper wiring; 23. insulating block; 24. middle fixing column; 25. lock nut; 26. signal line vacuum connector. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0034] like Figures 1 to 5 As shown, a superconducting wire axial strain critical performance testing device includes a mounting disk 4, an outer sleeve, an inner sleeve and a measuring module 10, wherein the outer sleeve is fixed to one side of the mounting disk 4; the inner sleeve is arranged inside the outer sleeve and is rotatably connected to the mounting disk 4; the measuring module 10 is arranged at one end of the inner sleeve away from the mounting disk 4, the measuring module 10 includes a cylindrical rotating disk 14 fixedly connected to the inner sleeve, a rod-shaped fixed disk 11 rotatably connected to the cylindrical rotating disk 14, and a C-shaped spring 13, one end of the rod-shaped fixed disk 11 is fixed to the outer sleeve, and the C-shaped spring 13 is fixed to the same side of the cylindrical rotating disk 14 and the rod-shaped fixed disk 11; wherein, the outer peripheral wall of the C-shaped spring 13 can be provided with a superconducting wire, and the two ends of the superconducting wire are led out to the outside of the inner sleeve, because the end of the inner sleeve away from the mounting disk 4 needs to be placed in a low-temperature environment, it is preferred to lead the two ends of the superconducting wire to the room temperature end for convenient wiring detection, and the room temperature end is located on one side of the mounting disk 4.

[0035] The mounting plate 4 preferably adopts a flange plate to facilitate the installation of the inner sleeve and the outer sleeve. The outer sleeve is fixed to the flange plate, and the inner sleeve can rotate relative to the outer sleeve; the rotation of the inner sleeve can drive the cylindrical turntable 14 to rotate, and the rod-shaped turntable is fixed to the outer sleeve. Therefore, when the inner sleeve rotates, the cylindrical turntable 14 and the rod-shaped turntable respectively drive the two ends of the C-shaped spring 13 to generate strain, and the superconducting wire is fixed to the outer peripheral wall of the C-shaped spring 13, such as crimping, screwing, and preferably soldering to the outer peripheral wall of the C-shaped spring 13. If there is strain on the circumferential surface of the C-shaped spring 13, it will be strained together with the C-shaped spring 13. Since the diameter of the superconducting wire is generally less than or equal to 1 mm, the strain difference generated can be ignored. It is generally believed that the strain value of the superconducting wire is equal to the strain value of the end face of the C-shaped spring 13. The superconducting wire is soldered to the outer wall of the flange, which can increase the placement range of the superconducting wire and the testing range of the superconducting wire. At the same time, the two ends of the C-shaped spring 13 are respectively fixed by the cylindrical turntable 14 and the rod-shaped fixed plate 11, so that when the cylindrical turntable 14 and the rod-shaped fixed plate 11 rotate relatively, the superconducting wire is evenly stressed on the outer wall of the C-shaped spring 13, thereby improving the uniformity and accuracy of the stress on the superconducting wire.

[0036] Specifically, the top of the rod-shaped fixed disk 11 is a fan-shaped plane, and one end of the C-shaped plane of the C-shaped spring 13 is fixed by means of a pin 12. The top of the cylindrical rotating disk is a fan-shaped plane, and the other end of the C-shaped spring 13 is fixed on the fan-shaped plane of the cylindrical rotating disk by means of a pin 12. Steps are provided on both sides of the C-shaped circumferential surface of the C-shaped spring 13. The outer sleeve and the inner sleeve can both be integrated. The outer sleeve and the inner sleeve of the present application are preferably divided into multiple sections for easy assembly. Preferably, two sections are used, such as the outer sleeve is composed of an upper and lower outer sleeve 1 5 and an outer sleeve 2 6. The outer sleeve 1 5 and the outer sleeve 2 6 are connected by screws, which are used to transmit torsional force, structural support and protection. They are made of G10 material, and the outer sleeve 1 5 is fixed to the mounting disk 4. The inner sleeve is composed of an upper and lower inner sleeve 1 8 and an inner sleeve 2 9. The inner sleeve 1 8 and the inner sleeve 2 9 are connected by screws, which are used to transmit torsional force, structural support and protection. They are made of G10 material, and the inner sleeve 1 8 is rotatably connected to the mounting disk 4.

[0037] like Figure 4 As shown, the C-shaped spring 13 is preferably arranged on one side of the cylindrical rotating disk 14 and the rod-shaped fixed disk 11 close to the mounting disk 4, so as to ensure the required ambient temperature during subsequent tests.

[0038] like Figure 1 , Figure 2 and Figure 3As shown, as an embodiment of the present application, an upper fixed column 2 and a worm gear device 3 are provided on the mounting plate 4, one end of the upper fixed column 2 is fixed to the inner sleeve, and the other end is connected to the worm wheel in the worm gear device 3, so that the upper fixed column 2 and the worm wheel rotate synchronously relative to the mounting plate 4. The worm of the worm gear device 3 rotates on the mounting plate 4 and drives the worm wheel to rotate, and the rotation of the worm wheel drives the upper fixed column 2 to rotate synchronously.

[0039] The end of the upper fixed column 2 away from the inner sleeve is penetrated by a current lead 1, which is connected to the superconducting wire on the outer peripheral wall of the C-shaped spring 13 to form a measurement circuit. It should be noted that the middle fixed column 24 is concentrically fixed to the end of the inner sleeve 1 8, and the middle fixed column 24 penetrates the current lead 1 to fix and support the current lead 1. The middle part of the current lead 1 is encapsulated in the inner sleeve 1 8 and the inner sleeve 2 9, and the two ends of the two current leads 1 extend out of the inner sleeve 1 8 and the inner sleeve 2 9 respectively. The inner sleeve 1 8 and the inner sleeve 2 9 are concentrically nested in the outer sleeve 1 5 and the outer sleeve, and the current lead 1 can be connected to the superconducting wire soldered on the outer wall of the C-shaped spring 13, which is convenient for detecting the specific value of the superconducting wire.

[0040] like Figures 4 to 6 As shown, as an embodiment of the present application, the end of the current lead 1 close to the test device is crimped with a copper connection 22, and the two ends of the superconducting wire are respectively connected to the corresponding copper connection 22. Specifically, the two ends of the superconducting wire are respectively connected to a ring piece 17 and a ring piece 2 18, and the ring piece 1 17 and the ring piece 2 18 are respectively connected to the corresponding copper connection 22, and the two ends of the superconducting wire are extended to connect the ring piece 1 17 and the ring piece 2 18 respectively.

[0041] Among them, the copper wiring 22 is made of Cu and superconducting material composite to improve the current carrying capacity. An insulating block 23 is also provided between the copper wiring 22. The copper wiring 22 frame is supported by the insulating block 23, so that the current can flow into the current lead 1, and pass through the copper wiring 22, ring piece 17 and the superconducting wire outside the C-shaped spring 13 in turn, and finally flow out from the ring piece 2 18, the copper wiring 22 on the other side and the current lead 1. The copper wiring 22 is preferably symmetrically arranged inside the inner sleeve 2 9, but the C-shaped spring 13 is installed with ring pieces 1 17 and ring pieces 2 18 at the opening, resulting in the misalignment of ring pieces 1 17, ring pieces 2 18 and the corresponding copper wiring 22. Therefore, the present application has additional copper wiring 22 fixedly installed on the insulating block 23, so that two adjacent copper wirings 22 are connected by a conductive arc block, and a superconducting wire is used to connect the two adjacent copper wirings 22 to the outer wall of the C-shaped spring 13, thereby realizing a closed loop.

[0042] It should be noted that the ring piece 17 and the ring piece 2 18 are only used for soldering and fixing the superconducting wire to improve the current carrying capacity to prevent the ring piece 1 17 and the ring piece 2 18 from heating up seriously. The two ends of the superconducting wire can be directly extended to the corresponding copper connection 22. The ring piece 17 and the ring piece 2 18 are for wiring the superconducting wire, which is convenient for welding the superconducting wire on the ring piece 1 17 and the ring piece 2 18. The ring piece 1 17 is fixed to the bottom end of the rod-shaped fixed disk 11 through the insulating sheet 19, and the ring piece 2 18 is fixed to the table bolt at the bottom of the cylindrical rotating disk 14, so that the current can flow in from the current lead 1, and pass through the copper connection 22 and the superconducting wire outside the C-shaped spring 13 in turn, and finally flow out from the copper connection 22 and the current lead 1 on the other side.

[0043] like Figure 4 and Figure 5 As shown, specifically, the superconducting wire to be tested is fixed on the circumferential surface of the C-shaped spring 13 by soldering, and its two ends are respectively wound around the C-shaped notch and led to the ring piece 1 17 and the ring piece 2 18. The ring piece 1 17 and the ring piece 2 18 are respectively connected to the two copper wires 22 by welding through the superconducting wire. The ring piece 1 17 and the ring piece 2 18 are used to support the superconducting wire. The ring piece 1 17 and the ring piece 2 18 are preferably made of copper, and can also be made of silver, aluminum, stainless steel or tin-silver-copper alloy. The copper wire 22 is pressed with indium and fixed with screws. The current lead 1 is insulated and fixed in the upper fixed column 2 and led to the room temperature end. The room temperature end of the upper fixed column 2 is installed with a signal line vacuum connector 26. The signal line vacuum connector 26 can, on the one hand, relieve the pressure on the inner sleeve, facilitate the recovery of the helium overflowing from the inner sleeve, reduce costs, and facilitate subsequent use. On the other hand, it can extend into the wire and can be connected to the temperature measuring component of the C-shaped spring 13. The inner sleeve of the signal line vacuum connector 26 is provided with a temperature chamber 21 at one end close to the measuring module 10, and a temperature control rod is fixedly connected to the end of the temperature chamber 21 away from the measuring module 10. A lock nut 25 is installed at the center of the upper fixed column 2, and a temperature chamber rod 20 is passed through the center of the lock nut 25. One end of the temperature chamber rod 20 is connected to the temperature chamber 21, and the temperature chamber 21 concentrically covers the measuring module 10. The temperature control rod is adjusted so that the temperature chamber 21 covers the measuring module 10 or is away from the measuring module 10, so as to meet the environment required for the test; the temperature control rod passes through the insulating block 23, and the insulating block 23 is used to separate two oppositely arranged copper wirings 22 to insulate the copper wirings 22 to avoid short circuits.

[0044] like Figure 3 and Figure 4 As shown, one end of the outer sleeve away from the mounting plate 4 is fixedly connected to the chassis 7, and one end of the rod-shaped fixed plate 11 is fixedly connected to the chassis 7. The outer sleeve can be integrally formed with the chassis 7, or can be separately provided. For example, the present application adopts the split installation of the outer sleeve and the chassis 7. Specifically, the chassis 7 is fixed to the outer sleeve 2 6 by means of threads or pins, and the chassis 7 can pass helium or nitrogen into the outer sleeve 2 6 to meet the required low temperature environment.

[0045] like Figure 4 and Figure 5 As shown, a bushing is provided between the cylindrical rotating disk 14 and the rod-shaped fixed disk 11, and one end of the bushing is fixedly connected to the chassis 7. The bushing can be made of brass or tin bronze, and can be integrated or split. The preferred bushing of the present application is divided into a bushing 15 and a bushing 2 16. The rod-shaped fixed disk is concentrically bushed in the hollow of the cylindrical rotating disk with bushing 15 and bushing 2 16, and the two can rotate relative to each other. The bushing is used to reduce the friction between the rod-shaped fixed disk and the cylindrical rotating disk, and avoid the use of lubricating oil in a low temperature environment. At low temperatures, the fluidity of the oil film deteriorates, and it is difficult to form an effective lubricating film, thereby failing to effectively reduce friction.

[0046] like Figures 1 to 5 As shown, the strain is loaded at the room temperature end, and the worm gear device 3 is driven by a spline screwdriver to apply force to the upper fixed column 2, the upper fixed column 2 applies force to the inner sleeve 1 8, the inner sleeve 1 8 transmits the force to the inner sleeve 2 9, the inner sleeve 2 9 applies force to the cylindrical turntable 14, the cylindrical turntable 14 applies force to one end of the C-shaped notch of the C-shaped spring 13, and the other end of the C-shaped notch is connected to the rod-shaped fixed plate 11. The rod-shaped fixed plate 11, the chassis 7, the outer sleeve 1 5, the outer sleeve 2 6 and the mounting plate 4 are fixedly connected. The left and right rotation of the cylindrical turntable 14 causes the notch of the C-shaped spring 13 to open or close, so that the sample surface produces tensile or compressive strain.

[0047] like Figure 4 As shown, when the temperature required for the test needs to be adjusted, the temperature cavity rod 20 can drive the temperature cavity 21 to move back and forth, creating a constant temperature environment with variable temperature for the C-shaped spring 13. The current transmission from room temperature to the low temperature end uses a hollow copper tube current lead 1. The hollow structure can use the liquid helium evaporation return gas to cool the current lead 1 and take away the Joule heat generated by the power-on. The current transmission between the current lead 1 and the sample uses a high-temperature superconducting tape, which further reduces the generation of Joule heat and reduces the consumption of liquid helium. However, the current lead 1 needs to be fixed with indium pressed on the copper wire 22, so the end of the current lead 1 and the copper wire 22 that is close to each other must be flat. The current lead 1 is connected to the copper wire 22 by indium pressing, and the superconducting material is welded in the notch of the copper wire 22, and is connected to the superconducting wire to be tested to form a test current loop. The voltage measurement uses one or two pairs of potential wires, and the measurement method is the four-lead method.

[0048] The present invention plays a great role in the critical performance test of axial positive and negative strain of superconducting wires under different temperatures and different background magnetic fields; it is suitable for the critical performance test experiment of axial strain of superconducting wires, and its sample axial strain loading structure is novel in design. Compared with other axial strain loading structures, it has the characteristics of uniform strain and large uniform strain area. This structure can be reliably contacted at low temperature and can pass large current. The operation is simple when replacing samples without damaging the superconducting wire.

[0049] The titanium alloy strain loading skeleton is used, which can make the sample strain reach ±0.7%, the opening displacement of the C-shaped spring 13 can reach ±1mm, and the worm gear transmission device can ensure the strain control accuracy of ±0.001%. The temperature control uses a pair of heating plates to control the temperature and a pair of thermometers to feedback the temperature in real time; the heating plates are fixed on both sides of the cylindrical turntable 14, heating and evaporating liquid helium, and the helium rises into the temperature chamber 21 to form a constant temperature environment with the temperature required for the experiment. The thermometer is fixed on the circumferential surface of the C-shaped spring 13 to accurately measure and feedback the ambient temperature of the superconducting sample to be tested. In the experiment, the heating plate can be adjusted according to the feedback temperature of the thermometer to realize a closed-loop temperature control system; changes in the temperature range of 4.2K-40K can be achieved, and the temperature control accuracy can reach ±0.1K.

[0050] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A superconducting wire axial strain critical performance testing device, characterized in that: include: Installation disk (4); An outer sleeve fixed to one side of the mounting plate (4); An inner sleeve, arranged inside the outer sleeve and rotatably connected to the mounting plate (4); as well as A measuring module (10) is arranged at one end of the inner sleeve away from the mounting plate (4), the measuring module (10) comprising a cylindrical rotating disk (14) fixedly connected to the inner sleeve, a rod-shaped fixed disk (11) rotatably connected to the cylindrical rotating disk (14), and a C-shaped spring (13), one end of the rod-shaped fixed disk (11) is fixed to the outer sleeve, and the C-shaped spring (13) is fixed on the same side of the cylindrical rotating disk (14) and the rod-shaped fixed disk (11); The outer peripheral wall of the C-shaped spring (13) can be provided with a superconducting wire, and both ends of the superconducting wire are led out to the outside of the inner sleeve.

2. The superconducting wire axial strain critical performance testing device according to claim 1, characterized in that: The C-shaped spring (13) is arranged on one side of the cylindrical rotating disk (14) and the rod-shaped fixed disk (11) close to the mounting disk (4).

3. The superconducting wire axial strain critical performance testing device according to claim 1, characterized in that: The superconducting wire is soldered to the outer peripheral wall of the C-shaped spring (13).

4. The superconducting wire axial strain critical performance testing device according to claim 1, characterized in that: An upper fixed column (2) and a worm gear device (3) are provided on the mounting plate (4); one end of the upper fixed column (2) is fixed to the inner sleeve, and the other end is connected to a worm wheel in the worm gear device (3), so that the upper fixed column (2) and the worm wheel rotate synchronously relative to the mounting plate (4).

5. The superconducting wire axial strain critical performance testing device according to claim 4, characterized in that: A current lead (1) passes through one end of the upper fixing column (2) away from the inner sleeve, and the current lead (1) is connected to the superconducting wire on the outer peripheral wall of the C-shaped spring (13) to form a measurement circuit.

6. The superconducting wire axial strain critical performance testing device according to claim 5, characterized in that: One end of the current lead (1) close to the test device is crimped with a copper wire (22), and both ends of the superconducting wire are respectively connected to the corresponding copper wire (22).

7. The superconducting wire axial strain critical performance testing device according to claim 1, characterized in that: One end of the outer sleeve away from the mounting plate (4) is fixedly connected to a chassis (7), and one end of the rod-shaped fixed plate (11) is fixedly connected to the chassis (7).

8. The superconducting wire axial strain critical performance testing device according to claim 7, characterized in that: A bushing is provided between the cylindrical rotating disk (14) and the rod-shaped fixed disk (11), and one end of the bushing is fixedly connected to the chassis (7).

9. The superconducting wire axial strain critical performance testing device according to claim 6, characterized in that: A temperature chamber (21) is provided at one end of the inner sleeve close to the measuring module (10); a temperature control rod is fixedly connected to one end of the temperature chamber (21) away from the measuring module (10); the temperature control rod passes through the upper fixed column (2); and the temperature chamber (21) is capable of approaching and sealing the measuring module (10).

10. The superconducting wire axial strain critical performance testing device according to claim 9, characterized in that: An insulating block (23) is also provided between the copper wires (22), and the temperature control rod passes through the insulating block (23).

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