A test device for continuously measuring the angular dependence of the magnetic field in superconducting tapes

Abstract

The present invention discloses a testing device for continuously measuring the angle dependence of a superconducting tape magnetic field. The testing device is composed of a transmission device, a conductive device and a basic frame, wherein the transmission device is the core part. The transmission device includes a scale dial, a worm, a worm wheel, a transmission shaft, a first bevel gear, a second bevel gear, a rotating shaft and a rotating plate. The transmission device can realize the rotation of the rotating plate at the bottom of the device at a specific angle by the scale disc at the top of the rotating device. The tape is fixed on the rotating plate and forms a desired angle with the magnetic field as the rotating plate rotates. The present invention energizes the current leads at both ends of the tape, measures the voltage at both ends of the tape, and obtains the critical current of the tape at the angle of the magnetic field according to the U‑I curve.

Description

Technical Field

[0001] The present invention belongs to the technical field of superconducting material performance measurement and testing, and in particular relates to a testing device for continuously measuring the magnetic field angle dependence of a superconducting tape, and explores the corresponding relationship between the current-carrying performance of the superconducting tape and its angle with the magnetic field. Background Art

[0002] High-temperature superconducting tapes currently have broad application prospects in superconducting cables, high-field magnets, accelerators, nuclear magnetic resonance and other fields. In different application scenarios and environments, the angle between the superconducting tape and the magnetic field is different. Due to the influence of the anisotropy of the superconducting tape, the current carrying performance of the superconducting tape is different under different magnetic field angles. Therefore, in order to predict the performance of the tape in actual application, it is necessary to test the current carrying performance of the tape under different magnetic field angles.

[0003] The existing method of testing the current carrying performance under different magnetic field angles is to change the angle between the tape and the magnetic field in the magnet by repeatedly changing the shape of the parts that fix the superconducting tape in the device. This method is relatively complicated and cumbersome. Each test can only test the current carrying performance of the superconducting tape under one magnetic field angle, and then the device is warmed up and the parts where the tape is fixed are changed again, so repeated welding and disassembly are required. This method is very inefficient and consumes a lot of liquid helium. Therefore, in one test process, the angle between the tape and the magnetic field can be changed to realize the test of the current carrying performance of the superconducting tape under multiple magnetic field angles, which can greatly improve the test efficiency and save liquid helium consumption. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a test device for continuously measuring the magnetic field angle dependence of superconducting tapes, which can realize the rotation of the scale plate at the top of the rotating device to make the rotating plate at the bottom of the device rotate at a specific angle, and the tape fixed on the rotating plate will form a required angle with the magnetic field as the rotating plate rotates. Through multiple measurements, the corresponding relationship between the current carrying performance of the superconducting tape and the magnetic field angle can be obtained.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A testing device for continuously measuring the angle dependence of a magnetic field of a superconducting tape, comprising a transmission device, a conducting device and a basic skeleton;

[0007] The transmission device includes a graduated dial, a worm, a worm wheel, a transmission shaft, a first bevel gear, a second bevel gear, a rotating shaft and a rotating plate; the graduated dial is connected to the worm, and the worm and the worm wheel are coupled to each other; the worm wheel is connected to the transmission shaft, and the other end of the transmission shaft is connected to the first bevel gear, and the first bevel gear and the second bevel gear are coupled to each other; the second bevel gear is connected to the rotating shaft, and the rotating plate is fixed on the rotating shaft; the worm is rotated by the graduated dial, and the worm wheel is driven to rotate; the first bevel gear is connected to the worm wheel through the transmission shaft, and rotates at the same angle as the worm wheel; the first bevel gear drives the second bevel gear to rotate, and the rotating plate on the rotating shaft is rotated;

[0008] The basic skeleton includes a cover plate, a support vertical plate, a stainless steel pipe, an intermediate fixed plate, a first fixed rod, a second fixed rod, a support block, a first side plate, a second side plate, a first bottom plate and a second bottom plate; the two support vertical plates are installed on the cover plate to fix the two ends of the worm; the two ends of the stainless steel pipe are respectively connected to the cover plate and the first bottom plate to fix the entire device; the first fixed rod is respectively connected to the cover plate and the first side plate, and the second fixed rod is respectively connected to the cover plate and the second side plate; the stainless steel pipe and the first fixed rod and the second fixed rod are all inserted into the hole of the intermediate fixed plate to ensure that the stainless steel pipe and the first fixed rod and the second fixed rod remain vertical in the test device; the support block is fixed to the first fixed rod by a nut to fix the transmission shaft; the first side plate, the second side plate and the first bottom plate and the second bottom plate are located at the bottom of the device, the upper ends of the first side plate and the second side plate are connected to the first fixed rod and the second fixed rod, and the middle is used to fix the rotating shaft; the first bottom plate and the second bottom plate are installed between the first side plate and the second side plate by bolts to form a cubic structure to fix each other;

[0009] The conductive device includes a copper braided belt and a copper block, which are used to energize the belt; the copper block is installed on a rotating plate, and the bottom is connected to the superconducting belt; the copper braided belt is externally connected to a current lead, and the bottom is connected to the copper block; the current lead is externally connected to a power source to energize the superconducting belt.

[0010] Furthermore, by calculating the transmission ratios among the scale rotating disk, the worm, the worm wheel, the first bevel gear and the second bevel gear, the proportional relationship between the scale rotation angle and the rotation angle of the rotating shaft is obtained.

[0011] Furthermore, by testing the current-carrying performance of the tape under multiple magnetic field angles, the corresponding relationship between the magnetic field angle and the current-carrying performance of the superconducting tape is obtained.

[0012] Furthermore, the rotating plate has four through holes for placing four copper blocks; one side of the copper block is flush with the bottom of the rotating plate, and both ends of the superconducting tape are welded to a copper block respectively, so that the four copper blocks connect two superconducting tapes, and the current-carrying performance of the two superconducting tapes is measured in turn.

[0013] Furthermore, the stainless steel tube is a hollow tube, the copper braided belt is inserted from the upper end thereof and comes out from the bottom end and is welded together with the copper block. There are two stainless steel tubes in total, two copper braided belts are placed inside each tube, and each copper braided belt is wrapped with a low-temperature tape for insulation.

[0014] Furthermore, the side of the support block is fixed to the first fixed rod by a nut, and the transmission shaft passes through the hole in the center of the support block; there are four support blocks in total, and the first and second support blocks are equipped with bearings to position the device while ensuring that the transmission shaft keeps rotating.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The device of the present invention can realize the test of the current carrying performance of the superconducting tape under multiple magnetic field angles in one experimental process, thereby improving the test efficiency. The device of the present invention can install two superconducting tapes in one experimental process, and can test the current carrying performance of the two superconducting tapes separately without taking out the device, thereby improving the test efficiency and saving liquid helium resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An overall view of a test device for continuously measuring the angular dependence of a magnetic field of a superconducting tape according to the present invention;

[0018] Figure 2 The bottom part of the test device for continuously measuring the angle dependence of the magnetic field of a superconducting tape of the present invention is Figure 1 ;

[0019] Figure 3 The bottom part of the test device for continuously measuring the angle dependence of the magnetic field of a superconducting tape of the present invention is Figure 2 .

[0020] In the figure, 1-support vertical plate, 2-worm, 3-scale turntable, 4-worm wheel, 5-cover plate, 6-transmission shaft, 7-support block, 8-first fixed rod, 9-second fixed rod, 10-middle fixed plate, 11-stainless steel pipe, 12-first bevel gear, 13-second bevel gear, 14-rotating shaft, 15-rotating plate, 16-copper block, 17-first bottom plate, 18-second bottom plate, 19-first side plate, 20-second side plate, 21-superconducting tape. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the embodiments of the present invention or the existing technical solutions, the drawings required for describing the existing technologies and embodiments are briefly introduced below.

[0022] like Figure 1-3As shown, a test device for continuously measuring the angle dependence of the magnetic field of a superconducting tape of the present invention comprises a transmission device, a conductive device and a basic frame. According to one embodiment of the present invention, the bottom of the test device of the present invention is immersed in liquid helium during the test process. The elements of the transmission device, the conductive device and the basic frame are interlaced with each other, and the entire device is connected and fixed by a stainless steel tube 11 and a first fixing rod 8 and a second fixing rod 9 in the basic frame.

[0023] The transmission device includes a graduated dial 3, a worm 2, a worm wheel 4, a transmission shaft 6, a first bevel gear 12, a second bevel gear 13, a rotating shaft 14 and a rotating plate 15; the graduated dial 3 is connected to the worm 2, and the worm 2 and the worm wheel 4 are coupled to each other. The worm wheel 4 is connected to the transmission shaft 6, and the other end of the transmission shaft 6 is connected to the first bevel gear 12, and the first bevel gear 12 and the second bevel gear 13 are coupled to each other. The second bevel gear 13 is connected to the rotating shaft 14, and the rotating plate 15 is fixed on the rotating shaft 14. The worm 2 is rotated by selecting the graduated dial 3, and the worm wheel 4 is driven to rotate. Since the first bevel gear 1 is connected to the worm wheel 4 through the transmission shaft 6, it will rotate at the same angle as the worm wheel 4. The first bevel gear 12 will drive the second bevel gear 13 to rotate, and then the rotating plate 15 on the rotating shaft 14 will rotate.

[0024] The basic frame includes a cover plate 5, a support vertical plate 1, a stainless steel pipe 11, an intermediate fixing plate 10, a first fixing rod 8, a second fixing rod 9, a supporting block 7, a first side plate 19, a second side plate 20, a first bottom plate 17 and a second bottom plate 18;

[0025] The two supporting upright plates 1 are installed on the cover plate 5 to fix the two ends of the worm 2; the two ends of the stainless steel pipe 11 are respectively connected to the cover plate 5 and the first bottom plate 17 to fix the entire device; the first fixing rod 8 is respectively connected to the cover plate 5 and the first side plate 19, and the second fixing rod 9 is respectively connected to the cover plate 5 and the second side plate 20; the stainless steel pipe 11 and the first fixing rod 8 and the second fixing rod 9 are all inserted into the hole of the middle fixing plate 10 to ensure that the stainless steel pipe 11 and the first fixing rod 8 and the second fixing rod 9 remain vertical in the test device; the support block 7 is fixed to the first fixing rod 8 by a nut to fix the transmission shaft 6; the first side plate 19, the second side plate 20 and the first bottom plate 17 and the second bottom plate 18 are located at the bottom of the test device, and the upper ends of the first side plate 19 and the second side plate 20 are connected to the first fixing rod 8 and the second fixing rod 9, and the middle is used to fix the rotating shaft 14; the first bottom plate 17 and the second bottom plate 18 are installed between the first side plate 19 and the second side plate 20 by bolts to form a cubic structure to fix each other.

[0026] The conductive device includes a copper braided belt and a copper block 16, which are used to energize the belt. The copper block 16 is installed on the rotating plate 15, and the bottom is connected to the superconducting belt; the copper braided belt is externally connected to a current lead, and the bottom is connected to the copper block 16; the current lead is externally connected to a power source, so that the superconducting belt can be energized. By testing the current carrying performance of the belt under multiple magnetic field angles, the corresponding relationship between the magnetic field angle and the current carrying performance of the superconducting belt can be obtained.

[0027] By calculating the transmission ratios among the scale rotating disk 3, the worm 2, the worm wheel 4, the first bevel gear 12 and the second bevel gear 13, the proportional relationship between the scale rotation angle and the rotation angle of the rotating shaft 14 is obtained.

[0028] The rotating plate 15 has four through holes for placing four copper blocks 16. One side of the copper block 16 is flush with the bottom of the rotating plate 15, and the two ends of the superconducting tape are welded to a copper block 16 respectively, so that the four copper blocks 16 can connect two superconducting tapes, and the current carrying performance of the two superconducting tapes can be measured in sequence, which saves resources and improves the test efficiency.

[0029] The stainless steel tube 11 is a hollow tube, with a copper braid inserted from the upper end and exiting from the bottom end to be welded to the copper block 16. There are two stainless steel tubes 11, each with two copper braids placed inside. Each copper braid needs to be wrapped with a low-temperature tape for insulation.

[0030] The side of the support block 7 is fixed to the first fixing rod 8 by a nut, and the transmission shaft 6 passes through the hole in the center of the support block 7. There are four support blocks 7, and the first and second ones are equipped with bearings to position the device while ensuring that the transmission shaft 6 can keep rotating.

[0031] During the operation of the device, the two ends of the superconducting tape to be tested are first welded to the copper block 16, and then the test device is placed in a low-temperature container. By rotating the scale turntable 3, the rotating plate 15 at the bottom of the device can be rotated at a specific angle through the transmission device worm 2, worm wheel 4, transmission shaft 6, first bevel gear 12, second bevel gear 13, and rotating shaft 14. The copper block 16 is fixed on the rotating plate 15, so the superconducting tape on the copper block 16 also rotates at a specific angle, thereby forming a certain angle with the magnetic field. By energizing the superconducting tape, the current-carrying performance of the superconducting tape under the magnetic field angle can be measured. By changing the angle between the tape and the magnetic field for multiple times, the magnetic field angle dependence of the superconducting tape can be measured.

[0032] Although the above describes the illustrative specific embodiments of the present invention to facilitate those skilled in the art to understand the present invention, and it should be clear that the present invention is not limited to the scope of the specific embodiments, for those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A test device for continuously measuring the angular dependence of the magnetic field of a superconducting tape, characterized in that: It includes a transmission device, a conductive device and a basic frame; The transmission device comprises a graduated dial (3), a worm (2), a worm wheel (4), a transmission shaft (6), a first bevel gear (12), a second bevel gear (13), a rotating shaft (14) and a rotating plate (15); the graduated dial (3) and the worm (2) are connected, the worm (2) and the worm wheel (4) are coupled to each other; the worm wheel (4) is connected to the transmission shaft (6), the other end of the transmission shaft (6) is connected to the first bevel gear (12), the first bevel gear (12) and the second bevel gear (13) are coupled to each other. The second bevel gear (13) is connected to the rotating shaft (14), and the rotating plate (15) is fixed on the rotating shaft (14); the worm (2) is rotated by the scale dial (3), thereby driving the worm wheel (4) to rotate; the first bevel gear (12) is connected to the worm wheel (4) by the transmission shaft (6), and rotates at the same angle as the worm wheel (4); the first bevel gear (12) drives the second bevel gear (13) to rotate, thereby causing the rotating plate (15) on the rotating shaft (14) to rotate; The basic frame comprises a cover plate (5), a supporting upright plate (1), a stainless steel pipe (11), an intermediate fixing plate (10), a first fixing rod (8), a second fixing rod (9), a supporting block (7), a first side plate (19), a second side plate (20), a first bottom plate (17) and a second bottom plate (18); the two supporting upright plates (1) are mounted on the cover plate (5) and are used to fix the two ends of the worm (2); the two ends of the stainless steel pipe (11) are respectively connected to the cover plate (5) and the first bottom plate (17) to fix the entire device; the first fixing rod (8) is respectively connected to the cover plate (5) and the first side plate (19), and the second fixing rod (9) is respectively connected to the cover plate (5) and the second side plate (20); the stainless steel pipe (11) and the first fixing rod (8), the second fixing rod (9) are respectively connected to the cover plate (5) and the second side plate (20); The rods (9) are inserted into the holes of the middle fixing plate (10) to ensure that the stainless steel tube (11) and the first fixing rod (8) and the second fixing rod (9) remain vertical in the test device; the support block (7) is fixed to the first fixing rod (8) by a nut to fix the transmission shaft (6); the first side plate (19), the second side plate (20) and the first bottom plate (17) and the second bottom plate (18) are located at the bottom of the device, the upper ends of the first side plate (19) and the second side plate (20) are connected to the first fixing rod (8) and the second fixing rod (9), and the middle is used to fix the rotating shaft (14); the first bottom plate (17) and the second bottom plate (18) are installed between the first side plate (19) and the second side plate (20) by bolts to form a cubic structure, which plays a role of mutual fixing; The conductive device comprises a copper braided belt and a copper block (16) for energizing the belt; the copper block (16) is mounted on a rotating plate (15) and connected to the superconducting belt at the bottom; the copper braided belt is externally connected to a current lead and connected to the copper block (16) at the bottom; the current lead is externally connected to a power source to energize the superconducting belt; The rotating plate (15) has four through holes for accommodating four copper blocks (16); one side of the copper block (16) is flush with the bottom surface of the rotating plate (15); two ends of the superconducting tape are respectively welded to a copper block (16); the four copper blocks (16) are thus connected to two superconducting tapes, and the current carrying performance of the two superconducting tapes is measured in turn.

2. A test device for continuously measuring the angle dependence of the magnetic field of a superconducting tape according to claim 1, characterized in that: By calculating the transmission ratios among the scale dial (3), the worm (2), the worm wheel (4), the first bevel gear (12) and the second bevel gear (13), a proportional relationship between the rotation angle of the scale dial and the rotation angle of the rotating shaft (14) is obtained.

3. A test device for continuously measuring the angle dependence of the magnetic field of a superconducting tape according to claim 1, characterized in that: By testing the current-carrying performance of the tape under multiple magnetic field angles, the corresponding relationship between the magnetic field angle and the current-carrying performance of the superconducting tape was obtained.

4. A test device for continuously measuring the angle dependence of the magnetic field of a superconducting tape according to claim 1, characterized in that: The stainless steel tube (11) is a hollow tube, and the copper braided belt is inserted from the upper end thereof and exits from the lower end thereof to be welded to the copper block (16). There are two stainless steel tubes (11) in total, and two copper braided belts are placed inside each of the two stainless steel tubes. Each copper braided belt is wrapped with a low-temperature tape for insulation.

5. A test device for continuously measuring the angle dependence of the magnetic field of a superconducting tape according to claim 1, characterized in that: The side of the support block (7) is fixed to the first fixing rod (8) by means of a nut, and the transmission shaft (6) passes through a hole in the center of the support block (7); there are four support blocks (7) in total, wherein the first and second support blocks are provided with bearings to position the device while ensuring that the transmission shaft (6) keeps rotating.

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