An automatic lifting device and lowering method for sample rod for superconducting wire RRR testing

Abstract

This invention discloses an automatic lifting device and method for lowering a sample rod in RRR (Reduced Rate of Change) testing of superconducting wires. The device includes a mounting bracket, a positioning part and a lifting part mounted on the mounting bracket, and a sample rod fixing part mounted on the lifting part. The lifting part is vertically movable. The sample rod is located on the sample rod fixing part and can be horizontally moved along it. A position adjustment part is provided on the outer periphery of the sample rod for fine-tuning its horizontal position. The positioning part is used to fix a Dewar flask, and the sample rod can freely rise and fall within the Dewar flask opening. This invention improves the automation level of the lowering process in RRR cryogenic testing of superconducting wires, significantly increases the efficiency of RRR cryogenic testing, reduces liquid helium evaporation during lowering, lowers testing costs, and powerfully promotes the development of equipment for superconducting wire production.

Description

Technical Field

[0001] This invention belongs to the field of low-temperature superconducting wire production technology, specifically relating to an automatic lifting device and a method for lowering a sample rod for RRR testing of superconducting wires. Background Technology

[0002] Superconducting wires are primarily used in the manufacture of high-field magnets, ultimately for large-scale scientific engineering projects and advanced equipment manufacturing, including new energy sources (ITER, CFETR), magnetic resonance imaging (MRI), and nuclear magnetic resonance (NMR). Currently, NbTi and Nb3Sn superconducting wires, as relatively mature superconducting products in terms of processing technology and application, are experiencing increasing demand both domestically and internationally. In recent years, with the deepening of research on superconducting wires, the need for marketization and industrialization has become increasingly urgent; therefore, the development of various related equipment and devices has also commenced.

[0003] Residual resistivity ratio (RRR) is one of the key indicators for evaluating the performance of superconducting wires. In the low-temperature testing of superconducting wires, the RRR test mainly includes three processes: Dewar pre-cooling, sample preparation, and testing. The testing process is further divided into multiple steps such as rod lowering, data acquisition, and analysis. The stability of the rod lowering process plays a crucial role in saving testing costs and ensuring the accuracy of test results.

[0004] Before testing begins, the sample rod, already loaded with liquid helium, must be placed in the Dewar flask containing the liquid helium. The tester erects the sample rod, attaches it to a simple lifting rod via a ring at its upper end, and then moves it to the center of the Dewar flask opening. The rod is then slowly lowered, ensuring it does not collide with the side wall of the Dewar flask opening during descent. Once the sample rod reaches the designated position, the tester presses down the baffle on the sample rod and locks the lifting rod, completing the lowering process. This method is not only inefficient but also fails to guarantee the stability of the lowering process, leading to significant liquid helium evaporation and greatly increasing testing costs. Furthermore, the lowering fixture has a low level of automation, is time-consuming and labor-intensive, and its functionality is no longer sufficient for on-site use requirements. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic lifting device and lowering method for a sample rod used in RRR testing of superconducting wires, which solves the problems of low efficiency, inability to guarantee rod lowering stability, high testing cost, and low degree of automation in low-temperature RRR testing of superconducting wires.

[0006] The technical solution adopted in this invention is an automatic lifting device for a sample rod used in RRR testing of superconducting wires, including a mounting bracket, a positioning part and a lifting part disposed on the mounting bracket, and a sample rod fixing part disposed on the lifting part; the lifting part can be displaced in the vertical direction; the sample rod is located on the sample rod fixing part and can be displaced horizontally along the sample rod fixing part; a position adjustment part is provided on the outer periphery of the sample rod for fine-tuning the horizontal position of the sample rod; the positioning part is used to fix the Dewar, and the sample rod can be freely raised and lowered within the Dewar opening.

[0007] Preferably, the lifting part includes a first linear guide rail, a first lead screw, a first slider, a connecting plate, a driving device, and a lifting bracket. The first linear guide rail is located on the mounting bracket. The driving device drives the first lead screw to move up and down through a power transmission device. The slider is located inside the first linear guide rail. The connecting plate is movably sleeved on the first lead screw and is fixedly connected to the lifting bracket and the first slider, respectively.

[0008] Preferably, a first lead screw nut seat is provided at the connection point between the connecting plate and the first lead screw.

[0009] Preferably, the sample rod fixing part includes a second linear guide rail, a second slider, a hook, and a limiting block. The second slider is located in the second linear guide rail and is connected to the hook. The sample rod is installed on the hook, and the limiting block is disposed at both ends of the second linear guide rail.

[0010] Preferably, there are multiple second sliders and second hooks.

[0011] Preferably, the position adjustment unit includes a third linear guide rail fixed to the mounting bracket, a third slider located in the third linear guide rail, a second lead screw, a movable base plate, an adjusting rod, and a guide ring. The second lead screw is rotatably inserted into a second lead screw nut seat. The movable base plate is fixedly connected to the second lead screw nut seat and the third slider on one side and to the adjusting rod on the other side. The other end of the adjusting rod is detachably fixedly connected to the guide ring, and the sample rod is placed inside the guide ring.

[0012] Preferably, the adjusting rod is threadedly connected to the guide ring, and the length of the adjusting rod is adjustable.

[0013] Preferably, the guide ring is divided into two halves, one half is fixed and the other half is movable, and the two halves are locked together by a wing screw. A PTFE protective plate is provided inside the guide ring.

[0014] Preferably, the positioning part includes a positioning rod with adjustable length and an arc-shaped ring, the positioning rod is fixed on the mounting bracket, and the arc-shaped ring is detachably fixed on the positioning rod.

[0015] Preferably, the arc-shaped ring is threadedly connected to the positioning rod, and the radius of the arc-shaped ring is the same as the radius of the Dewar.

[0016] Preferably, both the lifting part and the position adjusting part are provided with proximity switches for limiting the travel.

[0017] Preferably, the mounting bracket has a walking section at its bottom.

[0018] Preferably, the mounting bracket is provided with a control system for controlling the lifting part and the position adjustment part, and the control system includes a control cabinet and a display screen.

[0019] Preferably, a constant temperature bath is provided on one side of the Dewar.

[0020] A method for lowering a sample rod for RRR testing of superconducting wires includes the following steps:

[0021] S1. Push the automatic lifting device to the front of the Dewar for RRR testing, and replace the arc ring to make it compatible with the diameter of the Dewar;

[0022] S2. Lower the lifting bracket to its lowest point and hang the sample rod on the hook;

[0023] S3. Raise the lifting bracket to the highest point and install the sample rod inside the guide ring;

[0024] S4. Adjust the length of the positioning rod. When the arc ring and the Dewar surface are completely in contact, if the sample rod can move freely up and down at the Dewar opening without any bumps, then fix the traveling part.

[0025] S5. Start lowering the rod, adjust the proximity switch position, input the descent speed, press the start button, and the sample rod will begin to descend. When it reaches the Dewar port, the position of the sample rod can be finely adjusted.

[0026] S6. When the sample rod descends to the set height, press the stop button and the tester will perform the RRR test.

[0027] S7. After the test is completed, input the rising speed, press the start button, the lifting bracket will rise to the highest point, open the guide ring, and slide the sample rod to the Dewar side;

[0028] S8. If you want to continue with another sample rod, follow steps S3, S5, S6, and S7.

[0029] S9. If you stop lowering the rod, lower the lifting bracket to the lowest point, remove the sample rod from the hook, and turn off the main power supply of the equipment.

[0030] Preferably, in step S4, if the Dewar diameter is the same for multiple RRR tests, the length of the positioning rod only needs to be adjusted once.

[0031] Preferably, in step S5, during the fine-tuning of the sample rod position, attention is paid to whether it touches the Dewar port. If an alarm is triggered, the rod-down action will stop immediately, the proximity switch position will be adjusted, and the rod-down action will continue only after confirmation.

[0032] Preferably, in step S5, the position of the proximity switch needs to be adjusted according to the diameter of the Dewar orifice used for testing, and only one adjustment is needed for Dewars of the same diameter.

[0033] The beneficial effects of this invention are as follows:

[0034] 1. This invention improves the automation level of the rod lowering process in the RRR low-temperature test of superconducting wires, realizes the automatic lifting and lowering and automatic centering functions of the sample rod, and ensures the stability of the rod lowering process;

[0035] 2. This invention greatly improves the efficiency of RRR cryogenic testing, reduces the amount of liquid helium evaporation during the rod lowering process, and lowers testing costs;

[0036] 3. This invention has significantly advanced the research and development process of equipment for the production of superconducting wires. Attached Figure Description

[0037] Figure 1 This is a front view of an automatic lifting device for a sample rod used in RRR testing of superconducting wires according to the present invention.

[0038] Figure 2 This is a side view of an automatic lifting device for a sample rod used in RRR testing of superconducting wires according to the present invention.

[0039] Figure 3 This is a structural diagram of the RRR test sample rod of the present invention;

[0040] Figure 4 This is the RRR test sample substrate of the present invention.

[0041] The components include: 1. Mounting bracket; 2. Lifting unit; 3. Sample rod fixing unit; 4. Position adjustment unit; 5. Positioning unit; 6. Caster wheel; 7. Lifting bracket; 8. First lead screw; 9. Synchronous pulley; 10. Synchronous belt; 11. Stepper motor; 12. First lead screw nut seat; 13. First bearing seat; 14. First mounting base plate; 15. Second mounting base plate; 16. Connecting plate; 17. First linear guide rail; 18. First slider; 19. First proximity switch; 20. Second linear guide rail; 21. Second slider; 22. Fixing plate; 23. 24. Hook; 25. Limit block; 26. Third mounting base plate; 27. Servo motor; 28. Motor bracket; 29. ​​Second lead screw; 30. Coupling; 31. Second lead screw nut seat; 32. Second bearing seat; 33. Third linear guide; 34. Third slider; 35. Second proximity switch; 36. Moving base plate; 37. Adjusting rod; 38. Guide ring; 39. Positioning rod; 40. Arc ring; 41. Control cabinet; 42. Touch screen; 43. Sample rod; 44. Lifting ring; 45. Test substrate; 46. Superconducting wire; 47. Dewar. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer and more understandable, the technical solutions of this invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0043] like Figure 1 and Figure 2 As shown, the present invention provides an automatic lifting device for a sample rod for RRR testing of superconducting wires, including a mounting bracket 1, a positioning part 5 and a lifting part 2 disposed on the mounting bracket 1, and a sample rod fixing part disposed on the lifting part 2; the lifting part 2 can be displaced in the vertical direction; the sample rod 42 is located on the sample rod fixing part and can be displaced horizontally along the sample rod 42 fixing part; a position adjustment part 4 is provided on the outer periphery of the sample rod 42 for fine-tuning the horizontal position of the sample rod 42; the positioning part 5 is used to fix the Dewar, and the sample rod can be freely lifted and lowered within the Dewar opening.

[0044] Mounting bracket 1 is constructed from aluminum profiles, and the various structural parts are connected using corner fittings. The bottom of mounting bracket 1 is provided with a walking part, which in this embodiment is set as a caster wheel 6. The caster wheel 6 is equipped with a brake, which is used to lock the device after it reaches the designated position.

[0045] The lifting unit 2 includes a lifting bracket 7, a first lead screw 8, a synchronous pulley 9, a synchronous belt 10, a stepper motor 11, a first lead screw nut seat 12, a first bearing seat 13, a first mounting base plate 14, a second mounting base plate 15, a connecting plate 16, a first linear guide rail 17, a first slider 18, and a first proximity switch 19. The first mounting base plate 14, the second mounting base plate 15, and the first linear guide rail 17 are all fixed on the mounting bracket 1. The stepper motor 11 is fixed on the second mounting base plate 15, and its shaft end is provided with a synchronous pulley 9. The synchronous pulley 9 is connected to the shaft by a key. The lifting part 2 includes two sets of first bearing seats 13, one set of which is fixed on the second mounting base plate 15, and the other set is fixed on the first mounting base plate 14. The first lead screw 8 is fixed on the two sets of bearing seats, and a synchronous pulley 9 is provided on one side of the second mounting base plate 15. The synchronous pulley is fixedly connected to the first lead screw 8. In this embodiment, the connection is by a key, but welding can also be used. The synchronous belt 10 is connected to the two sets of synchronous pulleys 9, and the first lead screw 8 is driven by the stepper motor 11 for transmission. Two sets of first linear guides 17 are arranged on both sides of the lead screw 8. The first linear guides 17 are vertically arranged, and each set of first linear guides 17 has two sets of first sliders 18 that can slide on the first linear guides 17. Two sets of connecting plates 16 are fixed to the first linear guides 17 through the first sliders 18. One set of connecting plates 16 also has a first lead screw nut seat 12. The first lead screw nut seat 12 is connected to the first lead screw 8, and the connecting plate 16 is connected to the lifting bracket 7. A first proximity switch 19 is set at the highest and lowest points of the lifting bracket 7. The proximity switch can accurately reflect the position and stroke of the moving mechanism. The first proximity switch 19 realizes the start and stop of the action by detecting the connecting plate 16, preventing the lifting bracket 7 from exceeding the stroke range. The first lead screw nut seat is connected to the first lead screw, and the connecting plate 16 is connected to the lifting bracket. During operation, the stepper motor 11 drives the synchronous pulley 9 to rotate, and the synchronous pulley 9 drives the first lead screw 8 to rotate. The rotational motion of the first lead screw 8 is converted into the vertical motion of the lifting bracket 7 through the first lead screw nut seat 12. When the lifting bracket 7 reaches its maximum stroke, the first proximity switch 19 detects the signal and controls the stepper motor 11 to stop, thereby preventing the stroke from exceeding the range during the test.

[0046] The sample rod fixing part 3 includes a second linear guide rail 20, a second slider 21, a fixing plate 22, a hook 23, and a limiting block 24. The second linear guide rail 20 is fixed to the top of the lifting bracket 7 and is horizontally arranged. The second slider 21 is located inside the second linear guide rail 20. The fixing plate 22 is connected to the second slider 21 by screws. A hook 23 is provided below the fixing plate 22, and a sample rod 42 is detachably installed on the hook 23. Several second sliders 21 and hooks 23 can be provided, and several sample rods 42 can be hung at the same time. The limiting block 24 is provided on both sides of the second linear guide rail 20 to prevent the second slider 21 from sliding out from both ends of the second linear guide rail 20, which would cause the sample rod to fall off. A heat preservation tank is also provided on one side of the Dewar 46, which can realize the preheating and constant temperature of the sample rod 42. This embodiment is provided with two sets of second sliders 21, two sets of fixing plates 22, and two sets of hooks 23, which can realize the low temperature test of one sample rod 42 and the preheating and constant temperature of one sample rod 42 at the same time. During operation, the sample rod fixing part 3 moves vertically under the drive of the lifting bracket 7, while the sample rod 42 moves horizontally through the second slider 21 and the second linear guide rail 20.

[0047] like Figure 3 and Figure 4 As shown, the sample rod 42 has a lifting ring 43 at the top and a test substrate 44 perpendicular to the sample rod at the bottom. The test substrate 44 is circular, and several superconducting wires 45 are arranged within the test substrate 44. The sample rod 42 is connected to the hook 23 via the lifting ring 43 at the top.

[0048] The position adjustment unit 4 includes a third mounting base 25, a servo motor 26, a motor bracket 27, a second lead screw 28, a coupling 29, a second lead screw nut seat 30, a second bearing seat 31, a third linear guide rail 32, a third slider 33, a second proximity switch 34, a movable base 35, an adjusting rod 36, and a guide ring 37. The third mounting base 25 is fixed on the mounting bracket 1. The motor bracket 27, the second bearing seat 31, and the third linear guide rail 32 are all fixed on the third mounting base 25. The servo motor 26 is fixed on the motor bracket 27. The servo motor 26 is connected to the second lead screw 28 through a coupling 29. The second lead screw 28 is fixed on the second bearing seat 31, which is located at both ends of the second lead screw 28. The third linear guide rail 32 is horizontally set, and the third slider 33 is located inside the third linear guide rail 32. The other side of the third slider 33 is fixedly connected to the movable base 35. The second lead screw nut seat 30 is set on the movable base 35 and connected to the second lead screw 28. An adjusting rod 36 is installed on the other side of the movable base 35. A guide ring 37 is provided at the end of the adjusting rod 36. The adjusting rod 36 and the guide ring 37 are connected by threads. The length can be adjusted according to the different diameters of the Dewar 46 to achieve accurate centering. The guide ring 37 is divided into two halves, one half is fixed and the other half is movable. The two halves are locked together by wing screws. A PTFE protective plate is provided on the inner surface of the guide ring 37 to prevent scratches on the sample rod, and also serves to guide and prevent the sample rod from shaking during descent. There is a gap between the sample rod 42 and the PTFE protective plate, with a single-sided gap of ±1mm. The position adjustment part 4 can be used to adjust the position of the sample rod 42 during lifting and lowering. Second proximity switches 34 are located at both ends of the moving base plate 35, with an adjustable stroke range. The position of the second proximity switches 34 is determined according to the diameter of the Dewar flare, ensuring that the sample rod 42 moves within the Dewar flare diameter range. During operation, the servo motor 26 drives the second lead screw 28 to rotate, which is converted into horizontal movement of the moving base plate 35 via the second lead screw nut seat 30. The moving base plate 35 then drives the adjusting rod 36 and the guide ring 37 to move horizontally, thereby achieving horizontal position adjustment of the sample rod 42.

[0049] The positioning part 5 includes a positioning rod 38 and an arc-shaped ring 39. The positioning rod 38 is fixed to the mounting bracket 1, and its length is adjustable to accommodate Dewar 46 units of different diameters. The arc-shaped ring 39 is fixed to the end of the positioning rod, and the two are connected by threads. The radius of the arc-shaped ring 39 is the same as that of the Dewar 46, and it is designed with various specifications required for testing, facilitating disassembly and replacement. A PTFE protective plate is provided on the inner surface of the arc-shaped ring to prevent damage to the Dewar 46 during positioning.

[0050] The control system includes a control cabinet 40 and a touch screen 41, both fixed on the mounting bracket 1. The control system integrates automatic lifting start / stop, position adjustment jogging, speed setting, and extreme position alarm functions on the touch screen, enabling human-machine interactive operation.

[0051] A method for lowering a sample rod for RRR testing of superconducting wires specifically includes the following steps:

[0052] S1. Push the automatic lifting device to the front of the Dewar 46 for RRR testing, and replace the arc ring 39 according to the usage requirements to make it suitable for the diameter of Dewar 46.

[0053] S2. Lower the lifting bracket 7 to the lowest point, and then hang the sample rod 42 that has been loaded with samples on the hook.

[0054] S3. Slowly raise the lifting bracket 7 to the highest point, slide one of the sample rods 42 to the guide ring 37 by hand, open the guide ring 37, place the sample rod 42 inside the guide ring 37, and then lock the guide ring 37.

[0055] S4. Adjust the length of the positioning rod 38. When the arc ring 39 and the surface of the Dewar 46 are completely in contact, observe whether the center of the Dewar 46 opening is located on the lifting center line of the sample rod 42. If the sample rod 42 can be freely lifted and lowered without bumping, then lock the universal wheel 6.

[0056] S5. Begin the lowering of the sample rod. Adjust the position of the proximity switch, input the descent speed as required, and press the start button. The sample rod 42 will begin to descend slowly. When it reaches the Dewar 46 port, the position of the sample rod can be finely adjusted using the position adjustment jog button.

[0057] S6. When the sample rod 42 descends to the set height, press the stop button and the tester will begin the RRR test.

[0058] S7. After the test is completed, input the rising speed, press the start button to raise the lifting bracket 7 to the highest point, the tester puts on anti-frostbite gloves, opens the guide ring 37, and slides the sample rod 42 to the side of the Dewar 46.

[0059] S8. If you want to continue with another sample rod 42, operate it according to steps S3, S5, S6, and S7.

[0060] S9. If you stop lowering the rod, lower the lifting bracket 7 to the lowest point, then remove the sample rod from the hook by hand and turn off the main power of the equipment.

[0061] In step S4, if the Dewar 46 diameter is the same for multiple RRR tests, the length of the positioning rod 38 can be adjusted once.

[0062] In step S5, during the fine-tuning of the position of sample rod 42, be sure to check whether it touches the Dewar 46 port. If an alarm is triggered, the rod-down action will stop immediately. Adjust the proximity switch position and confirm before continuing to lower the rod.

[0063] In step S5, the position of the proximity switch needs to be adjusted according to the diameter of the Dewar 46 port used for testing. For Dewar 46 ports of the same diameter, the adjustment only needs to be done once.

[0064] This invention improves the automation level of the rod-down process in the RRR cryogenic test of superconducting wires, while greatly improving the efficiency of RRR cryogenic testing, reducing the amount of liquid helium volatilization during the rod-down process, lowering testing costs, and strongly promoting the research and development process of equipment for superconducting wire production.

Claims

1. An automatic lifting device for a sample rod used in RRR testing of superconducting wires, characterized in that, The device includes a mounting bracket, a positioning part and a lifting part disposed on the mounting bracket, and a sample rod fixing part disposed on the lifting part; the lifting part can be displaced in the vertical direction; the sample rod is located on the sample rod fixing part and can be displaced horizontally along the sample rod fixing part; a position adjustment part is provided on the outer periphery of the sample rod for fine-tuning the horizontal position of the sample rod; the positioning part is used to fix the Dewar, and the sample rod can be freely raised and lowered within the Dewar opening; the position adjustment part includes a third linear guide rail fixed to the mounting bracket, a third slider located in the third linear guide rail, a second lead screw, a movable base plate, an adjusting rod, and a guide ring; the second lead screw is rotatably inserted into a second lead screw nut seat; one side of the movable base plate is fixedly connected to the second lead screw nut seat and the third slider, and the other side is fixedly connected to the adjusting rod; the other end of the adjusting rod is detachably fixedly connected to the guide ring, and the sample rod is placed inside the guide ring.

2. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 1, characterized in that, The lifting unit includes a first linear guide rail, a first lead screw, a first slider, a connecting plate, a driving device, and a lifting bracket. The first linear guide rail is located on the mounting bracket. The driving device drives the first lead screw to move up and down through a power transmission device. The slider is located inside the first linear guide rail. The connecting plate is movably sleeved on the first lead screw and is fixedly connected to the lifting bracket and the first slider, respectively.

3. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 2, characterized in that, A first lead screw nut seat is provided at the connection point between the connecting plate and the first lead screw.

4. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 1, characterized in that, The sample rod fixing part includes a second linear guide rail, a second slider, a hook, and a limiting block. The second slider is located in the second linear guide rail and is connected to the hook. The sample rod is installed on the hook, and the limiting block is disposed at both ends of the second linear guide rail.

5. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 4, characterized in that, The second slider and the hook are provided in several quantities.

6. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 1, characterized in that, The adjusting rod is threadedly connected to the guide ring, and the length of the adjusting rod is adjustable.

7. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 1, characterized in that, The guide ring is divided into two halves, one half is fixed and the other half is movable. The two halves are locked together by a wing screw. A PTFE protective plate is provided inside the guide ring.

8. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 1, characterized in that, The positioning part includes an adjustable positioning rod and an arc-shaped ring. The positioning rod is fixed to the mounting bracket, and the arc-shaped ring is detachably fixed to the positioning rod.

9. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 8, characterized in that, The arc-shaped ring is connected to the positioning rod by a thread, and the radius of the arc-shaped ring is the same as the radius of the Dewar.

10. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 1, characterized in that, Both the lifting part and the position adjustment part are equipped with proximity switches for limiting the travel.

11. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 1, characterized in that, The mounting bracket has a walking section at its bottom.

12. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 1, characterized in that, The mounting bracket is equipped with a control system for controlling the lifting and position adjustment parts, and the control system includes a control cabinet and a display screen.

13. The automatic lifting device for the sample rod of superconducting wire RRR testing according to claim 1, characterized in that, A constant temperature bath is provided on one side of the Dewar.

14. A method for lowering a sample rod for RRR testing of superconducting wires, characterized in that, Includes the following steps: S1. Push the automatic lifting device for the sample rod of the superconducting wire RRR test according to any one of claims 1 to 13 to the front of the RRR test Dewar, and replace the arc ring to make it compatible with the diameter of the Dewar; S2. Lower the lifting bracket to its lowest point and hang the sample rod on the hook; S3. Raise the lifting bracket to the highest point and install the sample rod inside the guide ring; S4. Adjust the length of the positioning rod. When the arc ring and the Dewar surface are completely in contact, if the sample rod can move freely up and down at the Dewar opening without any bumps, then fix the traveling part. S5. Start lowering the rod, adjust the proximity switch position, input the descent speed, press the start button, and the sample rod will begin to descend. When it reaches the Dewar port, the position of the sample rod can be finely adjusted. S6. When the sample rod descends to the set height, press the stop button and the tester will perform the RRR test. S7. After the test is completed, input the rising speed, press the start button, the lifting bracket will rise to the highest point, open the guide ring, and slide the sample rod to the Dewar side; S8. If you want to continue with another sample rod, follow steps S3, S5, S6, and S7. S9. If you stop lowering the rod, lower the lifting bracket to the lowest point, remove the sample rod from the hook, and turn off the main power supply of the equipment.

15. The method for lowering the sample rod for RRR testing of superconducting wires according to claim 14, characterized in that, In step S4, if the Dewar diameter is the same for multiple RRR tests, the length of the positioning rod only needs to be adjusted once.

16. The method for lowering the sample rod for RRR testing of superconducting wires according to claim 14, characterized in that, In step S5, during the fine-tuning of the sample rod position, pay attention to whether it touches the Dewar port. If an alarm is triggered, the rod lowering action will stop immediately. Adjust the proximity switch position and continue lowering the rod only after confirming that it is in the correct position.

17. The method for lowering the sample rod for RRR testing of superconducting wires according to claim 14, characterized in that, In step S5, the position of the proximity switch needs to be adjusted according to the diameter of the Dewar orifice used for testing. For Dewars of the same diameter, the adjustment is only required once.

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