A high-temperature superconducting strand stretching device under a strong magnetic field

Abstract

This utility model discloses a high-temperature superconducting wire stretching device under a strong magnetic field, relating to the field of superconducting wire testing. It includes: a sealable Dewar; a test support, comprising a support frame with a stretching rod inside, the support frame partially extending into and sealingly connected to the sealable Dewar; the portion of the support frame extending into the sealable Dewar has upper and lower clamps distributed vertically, the lower clamp being fixed to the support frame, the upper clamp being connected to the stretching rod, and the stretching rod driving the upper clamp to stretch vertically; a magnet coil providing a strong magnetic field is provided on the outside of the sealable Dewar corresponding to the test sample. Using this solution, the mechanical properties of high-temperature superconducting wires can be tested for extended periods under stable low-temperature environments and strong background magnetic fields, improving the stability, accuracy, and applicability of the test, and providing more comprehensive and reliable data support for the research and application of high-temperature superconducting materials.

Description

Technical Field

[0001] This utility model relates to the field of superconducting strand testing, specifically to a high-temperature superconducting strand stretching device under a strong magnetic field. Background Technology

[0002] High-temperature superconducting materials such as Bi2Sr2Ca2Cu3O x First-generation high-temperature superconductivity and (RE)Ba2Cu3O x Second-generation high-temperature superconducting materials have achieved commercial production of hundreds of meters. Due to their strong current-carrying capacity under strong magnetic fields and their ability to maintain good current-carrying capacity even at temperatures higher than liquid helium, they are now widely used in various fields such as high-field experimental magnet coils, magnetic confinement nuclear fusion magnet coils, magnetic levitation trains, and superconducting power cables, becoming a future development trend.

[0003] In practical applications, high-temperature superconducting cables are often placed in strong magnetic field environments, causing them to experience significant Lorentz forces and inevitably leading to deformation of the superconducting material. When the internal strain of the superconducting material exceeds its irreversible strain, local defects such as cracks easily appear due to its inherent ceramic structure, resulting in a decrease in the critical current. Therefore, stress-strain testing of high-temperature superconducting materials and cables is of significant practical importance. However, the critical current of superconducting materials decreases with increasing magnetic field strength. Simply testing the stress-strain characteristics of the cable in its own field is insufficient to reflect the actual magnetic field environment. Traditional low-temperature tensile testing equipment based on tensile testing machines suffers from poor low-temperature stability and cannot apply strong magnetic fields, thus failing to fully assess the stress-strain characteristics of high-temperature superconducting cables under strong magnetic fields.

[0004] Existing stress-strain characteristic testing techniques for high-temperature superconducting cables typically only test the critical current characteristics under self-field conditions. This involves using a tensile testing machine, mounting a cryogenic Dewar at the bottom, fixing one end of the superconducting cable inside the Dewar, and mounting the other end of the cable at the top of the machine. The tensile force is gradually increased to adjust the strain on the cable, while simultaneously measuring the critical current. However, this existing technology has the following drawbacks:

[0005] First, existing technical solutions are limited by the use of open-type cryogenic Dewars. As the testing time increases, the cryogenic medium gradually evaporates. When the liquid level falls below the test area, it directly affects the cryogenic stability of the test environment, leading to fluctuations in test results and reducing test accuracy and data reliability.

[0006] Secondly, existing technologies cannot apply strong background magnetic fields to the testing system. Due to technological limitations, it is impossible to obtain stress-strain characteristic data of high-temperature superconducting cables under strong magnetic field conditions. This shortcoming restricts a comprehensive understanding and in-depth exploration of the behavior characteristics of high-temperature superconducting cables in complex electromagnetic environments. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention aims to provide a high-temperature superconducting strand stretching device under a strong magnetic field. This solution enables long-term testing of the mechanical properties of high-temperature superconducting strands under stable low-temperature environments and strong background magnetic fields, thereby improving the stability, accuracy, and applicability of the test and providing more comprehensive and reliable data support for the research and application of high-temperature superconducting materials.

[0008] This utility model is achieved through the following technical solution:

[0009] A high-temperature superconducting strand stretching device under a strong magnetic field includes:

[0010] Sealable Dewar;

[0011] The test stand includes a support frame with a tension rod inside, wherein a portion of the support frame can extend into the sealable Dewar and be sealed to the sealable Dewar.

[0012] The portion of the bracket that extends into the sealable Dewar has upper and lower clamps distributed vertically. The lower clamp can be fixed to the bracket, and the upper clamp is connected to a tension rod, which can drive the upper clamp to stretch up and down. The upper and lower clamps are used to hold the two ends of the test sample, respectively.

[0013] The test sample is equipped with a magnet coil on the outside of the sealable Dewar that can provide a strong magnetic field.

[0014] Compared to existing technologies, which are limited by the use of open-type cryogenic Dewars, the gradual evaporation of cryogenic media, and the inability to apply a strong background magnetic field to the testing system, this invention provides a high-temperature superconducting strand stretching device under a strong magnetic field. Using this solution, the mechanical properties of high-temperature superconducting strands can be tested for a long time under stable cryogenic environment and strong background magnetic field conditions, thereby improving the stability, accuracy, and applicability of the test and providing more comprehensive and reliable data support for the research and application of high-temperature superconducting materials. The specific design includes a sealable Dewar, in which the test sample, a high-temperature superconducting strand, can be tested. A test support can be mounted on the sealable Dewar, connected to a tensile testing machine. This support includes a frame with a space in the middle for a tension rod, and upper and lower clamps within the frame. The lower clamp is fixed inside the frame, while the upper clamp is suspended and connected to the lower end of the tension rod. During installation, the test sample is first placed between the upper and lower clamps. Then, the support is partially lowered into the sealable Dewar, and the upper opening of the frame and the sealable Dewar is sealed. This seals the testing environment, preventing the volatilization of the internal cryogenic medium and creating a stable cryogenic environment. Secondly, a magnet coil is placed on the outside of the sealable Dewar to provide a strong magnetic field inside, acquiring stress-strain characteristic data of the high-temperature superconducting cable under strong magnetic field conditions. This provides more comprehensive and reliable data support for the research and application of high-temperature superconducting materials. In addition, the axial spacing between the upper and lower clamps should be determined according to the length, width, quantity, and reserved gap of the actual sample to be tested.

[0015] Further optimization, to provide a longer test tensile stroke, includes a sealable Dewar comprising a test Dewar and a magnetic coil Dewar, both vertically distributed and internally connected. The support allows the test sample to be inserted into the magnetic coil Dewar, which provides a strong magnetic field. In this design, the test Dewar and the magnetic coil Dewar are vertically distributed and fixedly connected, with internal communication between them. The magnetic coil Dewar is used to provide a strong magnetic environment for the internal test sample by placing a magnetic coil around its periphery, while the upper test Dewar is cylindrical. During installation, the lower end of the support extends sequentially from below the test Dewar into the magnetic coil Dewar. This dual Dewar structure not only ensures the stability of the test environment but also integrates the functions of magnetic field generation and control.

[0016] For further optimization and to achieve a fixed connection, the bracket includes a support frame and a reaction frame connected in sequence, with a tension rod installed inside the support frame and the reaction frame. An upper flange is provided between the support frame and the reaction frame for a sealed connection with the top of the test Dewar. The support frame may include several circumferentially distributed support rods, and the reaction frame includes several circumferentially distributed reaction rods. To form a stable support structure, several partitions are sequentially spaced along the length of the reaction frame, and each reaction rod is fixedly connected via the partitions.

[0017] To achieve a detachable connection, both the upper and lower clamps include two fixed clamping blocks that can clamp each other. A groove for clamping the test sample is provided between the two fixed clamping blocks, and the two fixed clamping blocks are connected by several bolts.

[0018] To achieve further optimization and enable external insulation and energization of the test sample, the groove is provided with an insulating clamp and an energizing clamp in sequence from the inside to the outside, with the two opposing energizing clamps used to hold the test sample.

[0019] In a further optimization, both the upper and lower clamps have externally connected current leads for their energized clamping blocks. These current leads can pass through the insulating and fixing clamping blocks, and are sealed through the test chamber to connect to external electrical components. A first current lead is connected to the upper clamp, and a second current lead is connected to the lower clamp.

[0020] To further optimize the system and ensure the stable fixation of the test sample while facilitating current conduction, indium sheets are filled in the circumferential gap of the energized clamping block.

[0021] For further optimization and to achieve automatic control of the tensile force, the test bracket also includes a stepper motor. The stepper motor is fixedly connected to the top of the support frame, and the output end of the stepper motor can extend into the support frame and is connected to the upper end of the tension rod via a force sensor. The stepper motor is equipped with a stroke device. The tension rod is designed to not only move axially up and down to accommodate testing samples of different lengths, but also achieve precise control and monitoring of the tensile force through the precise connection between the force sensor and the stroke device.

[0022] Further optimization involves a sealed connection method where a tension bellows is installed within the support frame. The lower end of the tension bellows is sealed to the upper flange, while the upper end of the tension bellows encloses the tension rod in a sealed sleeve. Both the upper and lower ends of the tension bellows have axial through-holes for the tension rod to pass through. Since the lower end of the tension bellows is sealed and fixed to the upper flange, while the upper end is sealed to the tension rod, when the tension rod moves axially, it moves the upper end of the tension bellows. At this time, the volatile medium emitted from the test dewar and the through-hole in the middle of the upper flange can only enter the tension bellows, achieving a seal and preventing leakage.

[0023] In a further optimization, the sealable Dewar is filled with a cooling medium. The cooling medium can be liquid nitrogen or liquid helium.

[0024] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0025] 1. This invention provides a high-temperature superconducting wire stretching device under a strong magnetic field. By employing a sealable Dewar design, it effectively solves the problem of volatilization of cryogenic media (such as liquid nitrogen or liquid helium) during long-term testing, thereby ensuring the stability and durability of the cryogenic testing environment. This stability is crucial for accurately measuring the performance changes of high-temperature superconducting cables under stress and strain, significantly improving the accuracy and reliability of test data.

[0026] 2. This invention provides a high-temperature superconducting wire stretching device under a strong magnetic field, integrating a magnet Dewar, which can provide a stable and adjustable strong background magnetic field during testing. This enables in-depth research on the stress-strain characteristics of high-temperature superconducting cables under strong magnetic field conditions, filling a gap in existing technology in this field. Test data under strong magnetic field conditions are of great significance for understanding the physical mechanisms of high-temperature superconducting materials, optimizing material properties, and developing new superconducting applications.

[0027] 3. This utility model provides a high-temperature superconducting strand tensile device under a strong magnetic field. The testing device integrates multiple functions such as fixing, tensile testing, cooling, sealing, measurement, and control, forming a highly integrated testing system. This design not only simplifies the testing process and reduces operational difficulty but also improves testing efficiency. Furthermore, the integrated control system enables automated control of the testing process, further enhancing the convenience and accuracy of the test. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0029] Figure 1A schematic diagram of the high-temperature superconducting strand stretching device under a strong magnetic field provided by this utility model;

[0030] Figure 2 A schematic diagram of the lower structure of the bracket provided by this utility model;

[0031] Figure 3 A schematic diagram of the upper clamp structure provided by this utility model;

[0032] Figure 4 This is a schematic diagram of the lower clamp structure provided by this utility model.

[0033] The attached diagram shows the markings and corresponding component names:

[0034] 1. Stepper motor, 2. Force sensor, 3. Tension bellows, 4. Upper flange, 5. Test Dewar, 6. Reaction frame, 7. Magnet coil Dewar, 8. Magnet coil, 9. Stroke device, 10. Support frame, 11. First current lead, 12. Tension rod, 13. Partition, 14. Upper clamp, 15. Test sample, 16. Lower clamp, 17. Second current lead, 18. Bolt, 19. Fixing clamp, 20. Insulating clamp, 21. Energized clamp. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0036] Example 1:

[0037] This embodiment 1 provides a high-temperature superconducting strand stretching device under a strong magnetic field, such as... Figures 1-4 As shown, it includes:

[0038] Sealable Dewar;

[0039] The test stand includes a support frame with a tension rod 12 inside the support frame. A portion of the support frame can extend into the sealable Dewar and be sealed to the sealable Dewar.

[0040] The portion of the bracket that extends into the sealable Dewar has an upper clamp 14 and a lower clamp 16 distributed vertically. The lower clamp 16 can be fixed to the bracket, and the upper clamp 14 is connected to the tension rod 12, and the tension rod 12 can drive the upper clamp 14 to stretch vertically. The upper clamp 14 and the lower clamp 16 are respectively used to clamp the two ends of the test sample 15.

[0041] The test sample 15 is equipped with a magnet coil 8 on the outside of the sealable Dewar that can provide a strong magnetic field.

[0042] Compared to existing technologies, which are limited by the use of open-type cryogenic Dewars, the gradual evaporation of the cryogenic medium, and the inability to apply a strong background magnetic field to the testing system, this invention provides a high-temperature superconducting strand tensile device under a strong magnetic field. This solution enables long-term testing of the mechanical properties of high-temperature superconducting strands under stable cryogenic environments and strong background magnetic fields, improving the stability, accuracy, and applicability of the test, and providing more comprehensive and reliable data support for the research and application of high-temperature superconducting materials. Specifically, the device includes a sealable Dewar, in which the test sample 15, a high-temperature superconducting strand, can be tested. A test bracket can be installed on the sealable Dewar, connected to a tensile testing machine. The bracket includes a space in the middle for placing a tensile rod 12, and an upper clamp 14 and a lower clamp 16 are installed within the bracket. The lower clamp 16 is fixed within the bracket, while the upper clamp 14 is suspended and connected to the lower end of the tensile rod 12. During installation, the test sample 15 is first installed in the upper clamp. Between the upper clamp 14 and the lower clamp 16, the support is then partially lowered into the sealable Dewar, and the upper opening of the support and the sealable Dewar is sealed. This seals the test environment, preventing the volatilization of the internal cryogenic medium and creating a stable cryogenic environment. Secondly, a magnet coil 8 is installed on the outside of the sealable Dewar to provide a strong magnetic field inside, acquiring stress-strain characteristic data of the high-temperature superconducting cable under strong magnetic field conditions, thus providing more comprehensive and reliable data support for the research and application of high-temperature superconducting materials. Furthermore, the axial distance between the upper clamp 14 and the lower clamp 16 should be determined based on the actual length, width, number, and reserved gap of the sample to be tested.

[0043] In this embodiment, to provide a longer test tensile stroke, the sealable Dewar includes a test Dewar 5 and a magnetic coil Dewar 7, which are vertically distributed and internally connected. The support allows the test sample 15 to be inserted into the magnetic coil Dewar 7, which provides a strong magnetic field. In this design, the test Dewar 5 and the magnetic coil Dewar 7 are vertically distributed and fixedly connected, with internal communication between them. The magnetic coil Dewar 7 is used to provide a strong magnetic environment for the internal test sample 15 by arranging magnetic coils 8 around its periphery. The upper test Dewar 5 is vertically cylindrical. During installation, the lower end of the support can sequentially extend from below the test Dewar 5 into the magnetic coil Dewar 7. This dual Dewar structure not only ensures the stability of the test environment but also integrates the generation and control functions of the magnetic field.

[0044] In this embodiment, to achieve a fixed connection, the bracket includes a support frame 10 and a reaction frame 6 connected in sequence. A tension rod 12 is internally disposed between the support frame 10 and the reaction frame 6. An upper flange 4 is provided between the support frame 10 and the reaction frame 6, and the upper flange 4 is used for a sealed connection with the top of the test Dewar 5. The support frame 10 may include a plurality of circumferentially distributed support rods, and the reaction frame 6 includes a plurality of circumferentially distributed reaction rods. To form a stable support structure, a plurality of partitions 13 are sequentially spaced along the length of the reaction frame 6, and each reaction rod is fixedly connected by the partitions 13.

[0045] In this embodiment, to achieve a detachable connection, both the upper clamp 14 and the lower clamp 16 include two fixed clamping blocks 19 that can clamp each other. A groove for clamping the test sample 15 is opened between the two fixed clamping blocks 19, and the two fixed clamping blocks 19 are connected by several bolts 18.

[0046] In this embodiment, in order to achieve external insulation and energization of the test sample 15, an insulating clamp 20 and an energizing clamp 21 are arranged sequentially from the inside to the outside in the groove, and the two opposing energizing clamps 21 are used to clamp the test sample 15.

[0047] In this embodiment, both the energized clamps 21 in the upper clamp 14 and the lower clamp 16 are externally connected to current leads. These current leads can pass through the insulating clamp 20 and the fixing clamp 19, and are sealed through the test chamber to connect to external electrical components. A first current lead 11 is connected to the upper clamp 14, and a second current lead 17 is connected to the lower clamp 16.

[0048] In this embodiment, to ensure the stable fixation of the test sample 15 and facilitate the conduction of current, the circumferential gap of the energized clamp 21 is filled with indium sheets.

[0049] In this embodiment, to achieve automatic control of the stretching, the test bracket also includes a stepper motor 1. The stepper motor 1 is fixedly connected to the top of the support frame 10, and the output end of the stepper motor 1 can extend into the support frame 10 and is connected to the upper end of the tension rod 12 through a force sensor 2. The stepper motor 1 is equipped with a stroke device 9. The design of the tension rod 12 not only allows it to move axially up and down to adapt to the testing requirements of different lengths of the test sample 15, but also enables precise control and monitoring of the tensile force through the precise connection between the force sensor 2 and the stroke device 9.

[0050] In this embodiment, as a sealing connection method, the support frame 10 is further provided with a tensile bellows 3, the lower end of which is sealed to the upper flange 4; the upper end of the tensile bellows 3 is sealed and fitted inside the tensile rod 12; both the upper and lower ends of the tensile bellows 3 have through holes in the axial direction for the tensile rod 12 to pass through. Since the lower end of the tensile bellows 3 is sealed and fixed to the upper flange 4, while the upper end is sealed to the tensile rod 12, when the tensile rod 12 moves along its axial direction, it can drive the upper end of the tensile bellows 3 to move. At this time, the medium volatilized at the through hole in the middle of the test dewar 5 and the upper flange 4 can only enter the tensile bellows 3, thus achieving a seal and preventing leakage.

[0051] In this embodiment, the sealable Dewar is filled with a cooling medium. The cooling medium can be liquid nitrogen or liquid helium.

[0052] In addition, in this embodiment, the testing device of this solution is also equipped with a control system. This system, through circuit connections, is used to start and stop the device, set the applied tensile stress value and the applied varying current value, and realize the control of key components such as the motor, sensor, current source, and voltage testing device. The superconducting strands are placed between copper plates in a specially designed clamping fixture. A pressing process is used to ensure a tight fit between the copper plates and the surface of the superconducting strands to achieve good contact. Under a preset tensile force, the critical current test of the superconducting strands can also be performed using the "four-lead method".

[0053] With the superconducting strand under a preset tension, to ensure structural stability and reliable electrical connection, we first precisely place the superconducting strand between two specially made copper plates. Then, using high-strength bolts 18, we firmly press this assembly into the energized clamp 21, ensuring no loosening or poor contact occurs during testing. The upper clamp 14 and lower clamp 16 are used to fix both ends of the superconducting strand, and an extensometer is used to calibrate the strand. By moving the upper end of the tension bellows 3 and the tension rod 12 upwards, an appropriate pre-tension is applied to ensure the strand is in a naturally vertical state. Liquid nitrogen is injected into the Dewar 5 to one-third of its full height. The support is then vertically and stably placed in the designated position on the Dewar. The flange 4 on the upper part of the test Dewar 5 seals the support and the Dewar. After stabilization, the magnetic field of the magnet Dewar is set using an external magnetic field control system, while a computer control system gradually applies tensile stress.

[0054] The tension rod 12 moves upward, and the distance traveled is measured by the stroke device 9; the tension value is measured by the force sensor 2, and the movement stops when the set tension value is reached. Furthermore, when the superconducting strand is subjected to a preset tension, the critical current can be tested by energizing the superconducting strand using the "four-lead method".

[0055] The superconducting strand testing device of this scheme integrates the functions of fixing and stretching strands, and can also perform performance tests under tensile stress and magnetic field, and the tensile stress and magnetic field strength can be easily adjusted.

[0056] Example 2:

[0057] Based on Example 1, this Example 2 further provides the operational steps for testing the strain and fatigue characteristics of sample 15; the specific steps are as follows:

[0058] 1. Tensile strain characteristics test of strand under background field:

[0059] (1) Preparation of test sample 15: The superconducting strand is placed between the copper plates of the special fitting fixture, and the copper plate is pressed tightly against the surface of the superconducting strand through the pressing process. Two current leads are welded at a distance of 3 cm in the middle of the strand.

[0060] Adjust the clamp spacing to the preset value and reset it to zero. Then, vertically and slowly insert the sample into the clamp from below the support. After precise positioning, clamp it with bolt 18. Then, connect the two current leads welded on the strand to the test circuit of the test support.

[0061] Inject liquid nitrogen into the Dewar up to one-third of the way down from the bottom of the test Dewar 5. Once the liquid nitrogen has stabilized, place the test bracket vertically and stably inside the Dewar and check the sealing connection.

[0062] (2) Control system settings; Open the test control system panel and program, and create a new tensile test file. Set the tensile program parameters and prepare the critical current test system.

[0063] Turn on the power to the superconducting magnet measurement and control system and activate the magnet Dewar. Set parameters such as recording time, and adjust the magnetic field to the target background magnetic field strength to confirm magnetic field stability.

[0064] (3) Perform the tensile test; start the stepper motor 1, and precisely control the tensile rod 12 to move to the sample's natural tensile state through the tensile system control panel, and then reset the recording system to zero. Set and start the low-speed tensile program, apply a small tensile force initially, observe the system response, and ensure that the data reading is stable.

[0065] Once the initial set tensile force value is reached, the critical current value of the superconducting strand is measured and recorded after energization. The set tensile force value is then gradually increased, and the critical current is measured and recorded synchronously after stabilization.

[0066] (4) Data collection and analysis; Read and collect test data, including current-voltage curves, force-displacement curves, strain-time curves, etc. Analyze the data to evaluate the critical current and tensile strain characteristics of the superconducting strands under the background field.

[0067] (5) Restore the device; after the test is completed, unload the tension rod 12 to the initial position. Disassemble the test sample 15, clean and restore the test device to the initial state to prepare for the next test.

[0068] 2. Tensile fatigue characteristics test of the stock wire under background field:

[0069] (1) Preparation of test sample 15: The superconducting strand is placed between the copper plates of the special fitting fixture, and the copper plate is pressed tightly against the surface of the superconducting strand through the pressing process. Two current leads are welded at a distance of 3 cm in the middle of the strand.

[0070] Adjust the clamp spacing to zero, slowly and vertically insert the sample into the clamp from below the support, and clamp it with bolt 18 after positioning. Then connect the two current leads welded on the strand to the test circuit of the test support.

[0071] Inject liquid nitrogen into the Dewar up to one-third of the way down from the bottom of the test Dewar 5. Once the liquid nitrogen has stabilized, place the test bracket vertically and stably inside the Dewar and check the sealing connection.

[0072] (2) Control system setup; Open the test control system panel and program, and create a new tensile fatigue test file. Set the cyclic tensile parameters, including tensile force amplitude, number of cycles, loading speed, etc. Prepare the critical current test system.

[0073] Turn on the power to the superconducting magnet measurement and control system and activate the magnet Dewar. Set the recording time and other parameters on the system display screen, and adjust the magnetic field to the target background magnetic field strength to confirm that the magnetic field is stable.

[0074] (3) Fatigue test initiation: Initiate the fatigue test program to subject the superconducting wire to cyclic stretching under a background magnetic field. Measure and record the critical current once within each preset cycle. Observe the sample status in real time and record any damage or performance changes during the fatigue process.

[0075] (4) Data collection and analysis; Read and collect test data, including current-voltage curves, force-displacement curves, strain-time curves, etc. Analyze the data to evaluate the critical current, fatigue performance, and reliability of the superconducting strands under the background field.

[0076] (5) Restore the device; after the test is completed, unload the tension rod 12 to the initial position. Disassemble the test sample 15, clean and restore the test device to the initial state to prepare for the next test.

[0077] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high-temperature superconducting strand stretching device under a strong magnetic field, characterized in that, include: Sealable Dewar; The test stand includes a support, a tension rod (12) inside the support, and the support can partially extend into the sealable Dewar and be sealed to the sealable Dewar; The bracket extends into the sealable Dewar and has an upper clamp (14) and a lower clamp (16) distributed vertically. The lower clamp (16) can be fixed to the bracket. The upper clamp (14) is connected to the tension rod (12), and the tension rod (12) can drive the upper clamp (14) to stretch vertically. The upper clamp (14) and the lower clamp (16) are used to clamp the two ends of the test sample (15), respectively. The test sample (15) has a sealable dewar with a magnet coil that can provide a strong magnetic field on its exterior.

2. The high-temperature superconducting strand stretching device under a strong magnetic field according to claim 1, characterized in that, The sealable Dewar includes a test Dewar (5) and a magnet coil Dewar (7) that are distributed vertically and internally connected. The support can extend the test sample (15) into the magnet coil Dewar (7), which can provide a strong magnetic field inside.

3. The high-temperature superconducting strand stretching device under a strong magnetic field according to claim 2, characterized in that, The bracket includes a support frame (10) and a reaction frame (6) connected in sequence. A tension rod (12) is provided inside the support frame (10) and the reaction frame (6). An upper flange (4) is provided between the support frame (10) and the reaction frame (6). The upper flange (4) is used for a sealed connection with the top of the test Dewar (5).

4. The high-temperature superconducting strand stretching device under a strong magnetic field according to claim 3, characterized in that, The upper clamp (14) and the lower clamp (16) each include two fixed clamping blocks (19) that can clamp each other. A groove for clamping the test sample (15) is opened between the two fixed clamping blocks (19). The two fixed clamping blocks (19) are connected by several bolts.

5. The high-temperature superconducting strand stretching device under a strong magnetic field according to claim 4, characterized in that, The groove is provided with an insulating clamp (20) and an energized clamp (21) from the inside to the outside. The two opposing energized clamps (21) are used to clamp the test sample (15).

6. The high-temperature superconducting strand stretching device under a strong magnetic field according to claim 5, characterized in that, The energized clamps (21) in the upper clamp (14) and lower clamp (16) are all externally connected to current leads.

7. The high-temperature superconducting strand stretching device under a strong magnetic field according to claim 5, characterized in that, The circumferential gap of the energized clamp (21) is filled with indium sheets.

8. The high-temperature superconducting strand stretching device under a strong magnetic field according to claim 3, characterized in that, The test bracket also includes a stepper motor (1), which is fixedly connected to the top of the support frame (10), and the output end of the stepper motor (1) can extend into the support frame (10) and is connected to the upper end of the tension rod (12) through the force sensor (2); the stepper motor (1) is provided with a stroke device (9).

9. The high-temperature superconducting strand stretching device under a strong magnetic field according to claim 8, characterized in that, The support frame (10) is also provided with a tension bellows (3), the lower end of the tension bellows (3) is sealed to the upper flange (4); the upper end of the tension bellows (3) is sealed inside the tension rod (12); the upper and lower ends of the tension bellows (3) are both provided with through holes in the axial direction for the tension rod (12) to pass through.

10. A high-temperature superconducting strand stretching device under a strong magnetic field according to any one of claims 1 to 9, characterized in that, The sealable Dewar is filled with a cooling medium.

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