A superconducting magnetic field thermal shielding device

Abstract

The present invention belongs to the technical field of thermal shielding, and specifically relates to a superconducting magnetic field thermal shielding device. A superconducting magnetic field thermal shielding device includes: a cooling device 1 for cooling a superconducting magnet; a thermal insulation cover 3 disposed outside the cooling device 1 for wrapping the cooling device 1; an automatic wrapping assembly includes a mounting ring 2 provided at the top of the cooling device 1, a rotating frame 22 is provided on one side of the mounting ring 2, a winding shaft 221 is rotatably connected between the two rotating frames 22, the thermal insulation cover 3 is wound around the outside of the winding shaft 221, a fixing block 21 is provided on the other side of the mounting ring 2, and a motor 24 is installed on one side of the mounting ring 2; by driving the rotating frame to rotate by the motor, the rotating frame can drive the thermal insulation cover to unwind when rotating under the limiting action of the fixing block, and the thermal insulation cover automatically unwinds and wraps on the outer surface of the cooling device during the rotation of the rotating frame, which can realize automatically wrapping the outside of the cooling device and reduce the manual operation time required for installation.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal shielding, and specifically relates to a thermal shielding device for a superconducting magnetic field. Background Art

[0002] A superconducting magnet is an electromagnet made of superconducting materials, which has extremely high current transmission efficiency and magnetic field generation ability at low temperatures. When a superconducting magnet is in use, it needs to be in an ultra-low temperature environment, so a cooling device is required to cool it in real time. A shielding device is used outside the cooling device to isolate the cooling device from the external environmental magnetic field and temperature.

[0003] A patent application with the publication number CN104319056A discloses a thermal shielding structure for a cooling device of a low-temperature superconducting magnetic field. In the present invention, fiberglass cloth is sewn on the adiabatic cover, and the structure is divided into upper and lower parts for convenient installation and disassembly. A circular hole is provided at the top of the adiabatic structure, and a cross-shaped opening is provided in the hole for convenient installation of the circuit.

[0004] In the above technical solution, the adiabatic cover will be wrapped outside the cooling device during use. However, when wrapping, it is necessary to manually fit the adiabatic cover on the outside of the cooling device and manually fit and fix the fixed corners. The operation is relatively cumbersome, and the insulating cover may shift during the wrapping process and needs to be manually adjusted, which is time-consuming.

[0005] Therefore, the present invention provides a thermal shielding device for a superconducting magnetic field. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A thermal shielding device for a superconducting magnetic field according to the present invention, the device includes: a cooling device for cooling the superconducting magnet; an adiabatic cover disposed outside the cooling device for wrapping the cooling device; an automatic wrapping assembly for unwinding and wrapping the adiabatic cover wound outside the cooling device around the outer circumference of the cooling device.

[0008] Preferably, the automatic wrapping assembly includes: a mounting ring disposed at the top of the cooling device. Two rotating frames are provided on one side of the mounting ring. A winding shaft is rotatably connected between the two rotating frames. The heat insulation quilt is wound around the outside of the winding shaft. A fixed block is provided on the other side of the mounting ring. A motor is installed on one side of the mounting ring. The motor drives the rotating frame to rotate to lay the heat insulation quilt on the outside of the cooling device; a displacement plate rotatably connected inside the mounting ring, and a plurality of third teeth are fixedly arranged at equal intervals at the bottom end of the displacement plate; a rotating arm provided on one side of the top of the mounting ring, with a telescopic rod provided inside the rotating arm. The bottom end of the rotating arm is fixedly connected to one side of the top end of the displacement plate through a connecting plate. A sliding hole for the connecting plate at the bottom end of the rotating arm to move is opened at the top of the mounting ring. The telescopic rod close to the rotating frame is fixedly connected to the rotating frame; a fixed arm fixed on the other side of the top of the mounting ring, and a telescopic rod is also provided inside the fixed arm, and one side of the telescopic rod inside the fixed arm is fixedly connected to the fixed block; a sliding column rotatably connected inside the mounting ring through a support plate. Four sliding columns are arranged at equal intervals inside the mounting ring. One end of one of the sliding columns is fixedly connected to the end of the rotating shaft of the motor. A moving gear is sleeved on the outside of the sliding column. The top end of the moving gear can be meshed with the displacement plate through the third teeth.

[0009] Preferably, the telescopic rod is inserted into the inside of the rotating arm. A threaded rod is rotatably connected inside the rotating arm. The threaded rod is threadedly connected to the telescopic rod. The end of the threaded rod away from the telescopic rod is fixed with a second gear. A turntable is rotatably connected inside the mounting ring. The turntable is arranged below the moving gear. A plurality of second teeth are arranged at equal intervals in a circle close to the moving gear at the top end of the turntable. The moving gear can be meshed with the second teeth. A plurality of first teeth are arranged at equal intervals in a circle away from the moving gear at the top end of the turntable. The bottom end of the second gear is meshed with the turntable through the first teeth. The inside of the fixed arm is provided with the same structure as that inside the rotating arm.

[0010] Preferably, a bottom plate is arranged below the turntable. The bottom end of the bottom plate is closely attached to the bottom end inside the mounting ring. A plurality of second springs are fixedly arranged at equal intervals between the turntable and the bottom plate. A limiting ring is fixedly arranged at the outermost side of the top end of the turntable. The limiting ring is fixedly connected to the second teeth. The height of the limiting ring is greater than the height of the second teeth. The height of the limiting ring is equal to the height of the first teeth. A first spring is sleeved on the outside of the sliding column close to one end of the second teeth. One end of the first spring is fixedly connected to the sliding column. The other end of the first spring is fixedly connected to the moving gear. Slopes are arranged on both sides of the first teeth.

[0011] Preferably, there are two fixed blocks. The two fixed blocks are symmetrically distributed about the horizontal center line of the cooling device. A connecting rod is fixed on the side of the fixed block away from the mounting ring. The two fixed blocks are fixedly connected through the connecting rod. A limiting rod is arranged on the side of the fixed block close to the mounting ring inside the fixed block.

[0012] Preferably, four fixed suction cups are fixedly arranged at equal intervals on the outside of the mounting ring.

[0013] Preferably, a guiding rotating rod is fixed on the side of the rotating frames away from the winding shaft. On the side of the guiding rotating rod close to the cooling device, the heat insulation cover is closely attached to the outer surface of the guiding rotating rod. Two clamping columns are arranged above and below the side of the guiding rotating rod away from the winding shaft. The clamping columns are rotatably connected to the rotating frames. A fixing rod is fixed at one end of the heat insulation cover away from the winding shaft.

[0014] Preferably, a push rod is fixed at one end of the rotating frame away from the guiding rotating rod through a connecting block. The top end of a rotating column rotatably connected inside the fixing block is fixed with a first gear. A sector gear plate is arranged on the side of the first gear away from the limiting rod. The sector gear plate is rotatably connected to the fixing block. The first gear is meshed with the sector gear plate. The bottom end of the rotating column is fixed with a clamping cover. The inner diameter of the clamping cover matches the outer diameter of the fixing rod.

[0015] Preferably, a sliding rod is fixed at one end of the limiting rod close to the rotating column. A guiding groove is formed on one side of the rotating column. The sliding rod of the limiting rod extends into the guiding groove. A sliding hole for the lifting of the limiting rod is formed inside the fixing block.

[0016] Preferably, a torsion spring is fixed on the outer part of the winding shaft. The outer side of the torsion spring is fixedly connected to the rotating frame.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. For a superconducting magnetic field thermal shielding device described in the present invention, the rotating frames are driven to rotate by a motor. Under the limiting action of the fixing block, when the rotating frames drive the heat insulation cover to rotate, the heat insulation cover can be unrolled. The heat insulation cover is automatically unrolled and wrapped on the outer surface of the cooling device during the rotation of the rotating frames, so as to automatically wrap the outside of the cooling device and reduce the manual operation time required for installation.

[0019] 2. For a superconducting magnetic field thermal shielding device described in the present invention, by the telescopic rod telescoping inside the rotating arm, the distance between the fixing block and the rotating frame and the mounting ring can be automatically adjusted. And through the simultaneous movement of the fixing block and the rotating frame, the mounting ring can be positioned, so that the mounting ring is located in the middle of the top of the cooling device, preventing the position deviation of the mounting ring from affecting the wrapping of the heat insulation cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 is a perspective view of the shielding device and the cooling device of the present invention;

[0022] Figure 2 is a perspective view of the shielding device of the present invention;

[0023] Figure 3 is a schematic diagram of the internal structure of the mounting ring in the present invention;

[0024] Figure 4 is a schematic structural diagram of the motor in the present invention;

[0025] Figure 5 is a schematic internal structure diagram of the rotating arm in the present invention;

[0026] Figure 6 is a schematic structural diagram of the rotating frame in the present invention;

[0027] Figure 7 is a schematic structural diagram of the fixing block in the present invention;

[0028] Figure 8 is a schematic internal structure diagram of the fixing block in the present invention.

[0029] In the figure: 1. Cooling device; 2. Mounting ring; 21. Fixing block; 211. Connecting rod; 212. Rotating column; 213. First gear; 214. Guide groove; 215. Sector tooth plate; 216. Limiting rod; 217. Clamping cover; 22. Rotating frame; 221. Winding shaft; 222. Torsion spring; 223. Guide rotating rod; 224. Push rod; 225. Clamping column; 23. Rotating arm; 231. Threaded rod; 232. Second gear; 233. Telescopic rod; 24. Motor; 241. Slide column; 242. Moving gear; 243. First spring; 25. Fixed suction cup; 26. Turntable; 261. First tooth; 262. Second tooth; 263. Limiting ring; 264. Base plate; 265. Second spring; 27. Displacement plate; 271. Third tooth; 28. Fixed arm; 3. Heat insulation cover; 31. Fixed rod. Detailed implementation manners

[0030] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0031] As Figures 1 to 3 shown, a superconducting magnetic field thermal shielding device according to an embodiment of the present invention includes: a cooling device 1 for cooling a superconducting magnet; a heat insulation cover 3 disposed outside the cooling device 1 for wrapping the cooling device 1; an automatic wrapping assembly for unwinding and wrapping the heat insulation cover 3 wound outside the cooling device 1 around the periphery of the cooling device 1;

[0032] When in use, the superconducting magnet will be installed inside the cooling device 1. During the operation of the superconducting magnet, in order to make it more stable, the thermal insulation cover 3 needs to be wrapped around the outside of the cooling device 1, which can isolate the cooling device 1 from the external superconducting magnetic field and temperature. When the thermal insulation cover 3 is wrapped around the outside of the cooling device 1, the thermal insulation cover 3 is wrapped around the outside of the cooling device 1 through an automatic wrapping assembly. The thermal insulation cover 3 is a multi-layer composite material. Wrapping the thermal insulation cover 3 around the outside of the cooling device 1 can isolate its temperature and superconducting magnetic field.

[0033] As Figures 1 to 5 shown, the automatic wrapping assembly includes: a mounting ring 2, arranged at the top of the cooling device 1. There are two rotating frames 22 arranged on one side of the mounting ring 2. A winding shaft 221 is rotatably connected between the two rotating frames 22. The thermal insulation cover 3 is wound around the outside of the winding shaft 221. A fixed block 21 is arranged on the other side of the mounting ring 2. A motor 24 is installed on one side of the mounting ring 2. The motor 24 is used to drive the rotating frame 22 to rotate and lay the thermal insulation cover 3 on the outside of the cooling device 1; a displacement plate 27, rotatably connected inside the mounting ring 2. A plurality of third teeth 271 are fixedly arranged at equal intervals at the bottom end of the displacement plate 27; a rotating arm 23, arranged on one side of the top of the mounting ring 2. A telescopic rod 233 is arranged inside the rotating arm 23. The bottom end of the rotating arm 23 is fixedly connected to one side of the top end of the displacement plate 27 through a connecting plate. A sliding hole for the movement of the connecting plate at the bottom end of the rotating arm 23 is opened at the top of the mounting ring 2. The telescopic rod 233 closer to the rotating frame 22 is fixedly connected to the rotating frame 22; a fixed arm 28, fixed on the other side of the top of the mounting ring 2. A telescopic rod 233 is also arranged inside the fixed arm 28, and one side of the telescopic rod 233 inside the fixed arm 28 is fixedly connected to the fixed block 21; a sliding column 241, rotatably connected inside the mounting ring 2 through a support plate. Four sliding columns 241 are arranged at equal intervals inside the mounting ring 2. One end of one of the sliding columns 241 is fixedly connected to the end of the rotating shaft of the motor 24. A moving gear 242 is sleeved on the outside of the sliding column 241. The top end of the moving gear 242 can be meshed with the displacement plate 27 through the third teeth 271;

[0034] When the heat insulation cover 3 is wrapped around the outside of the cooling device 1, first place the mounting ring 2 on the top of the cooling device 1, then fix one end of the heat insulation cover 3 through the fixing block 21, start the motor 24 to drive the rotating frame 22 to rotate, and during the rotation process, the heat insulation cover 3 outside the winding shaft 221 will be unrolled. During the process of the motor 24 driving the rotating frame 22 to rotate, the third tooth 271 can be meshed and connected with the moving gear 242. During the rotation of the rotating frame 22, start the motor 24 to drive the sliding column 241 to rotate, the sliding column 241 drives the moving gear 242 outside it to rotate, the moving gear 242 drives the displacement plate 27 to rotate through the third tooth 271, and when the displacement plate 27 rotates, it will drive the rotating arm 23 fixedly connected to the rotating frame 22 to rotate through the connecting plate. The rotating arm 23 drives the rotating frame 22 to rotate through the telescopic rod 233, and when the rotating frame 22 rotates, it can drive the heat insulation cover 3 to be wrapped around the outside of the cooling device 1.

[0035] As Figures 1 to 5 shown, the telescopic rod 233 is inserted into the inside of the rotating arm 23. A threaded rod 231 is rotatably connected inside the rotating arm 23. The threaded rod 231 is threadedly connected to the telescopic rod 233. One end of the threaded rod 231 away from the telescopic rod 233 is fixed with a second gear 232. A turntable 26 is rotatably connected inside the mounting ring 2. The turntable 26 is arranged below the moving gear 242. A plurality of second teeth 262 are equidistantly arranged in a circle near the moving gear 242 at the top of the turntable 26. The moving gear 242 can be meshed and connected with the second teeth 262. A plurality of first teeth 261 are equidistantly arranged in a circle away from the moving gear 242 at the top of the turntable 26. The bottom end of the second gear 232 is meshed with the turntable 26 through the first teeth 261. The inside of the fixed arm 28 is provided with the same structure as the inside of the rotating arm 23;

[0036] When installing the mounting ring 2, the telescopic rod 233 extends out of the inside of the rotating arm 23 to the maximum length, and before positioning, the moving gear 242 is in a state of being meshed and connected with the second teeth 262. When positioning, start the motor 24 to drive the moving gear 242 to rotate. The moving gear 242 drives the turntable 26 to rotate through the second teeth 262. The second teeth 262 drive the second gear 232 to rotate through the first teeth 261. The second gear 232 drives the threaded rod 231 to rotate. At this time, the threaded rod 231 drives the telescopic rod 233 to retract into the inside of the rotating arm 23. During this process, the fixing block 21 and the rotating frame 22 will automatically tighten the same distance, and the mounting ring 2 can be fixed on the top of the cooling device 1.

[0037] As Figures 1 to 5As shown in the figure, a bottom plate 264 is provided below the turntable 26. The bottom end of the bottom plate 264 is tightly attached to the bottom end inside the mounting ring 2. A plurality of second springs 265 are fixedly arranged at equal intervals between the turntable 26 and the bottom plate 264. The outermost side of the top end of the turntable 26 is fixedly provided with a limiting ring 263. The limiting ring 263 is fixedly connected to the second tooth 262. The height of the limiting ring 263 is greater than the height of the second tooth 262, and the height of the limiting ring 263 is equal to the height of the first tooth 261. A first spring 243 is sleeved on the outer side of the sliding column 241 near one end of the second tooth 262. One end of the first spring 243 is fixedly connected to the sliding column 241, and the other end of the first spring 243 is fixedly connected to the moving gear 242. Slopes are arranged on both sides of the first tooth 261;

[0038] When fixing the mounting ring 2, the telescopic rod 233 retracts into the inside of the rotating arm 23. At this time, the moving gear 242 is in a meshing state with the second tooth 262, and the limiting ring 263 limits the moving gear 242. The second gear 232 continuously rotates to drive the telescopic rod 233 to retract into the inside of the rotating arm 23. When the fixing block 21 and the rotating frame 22 come into contact with the outer side of the cooling device 1, they will not be able to move further. At this time, the telescopic rod 233 is fixed, the threaded rod 231 is fixed by the telescopic rod 233, and the threaded rod 231 fixes the second gear 232. At this time, the turntable 26 will continue to rotate. During the rotation process, due to the limitation of the second gear 232, when the first tooth 261 rotates, it will push the turntable 26 downward along the slope on its surface. The turntable 26 moves downward to squeeze the limiting ring 263, and the limiting ring 263 and the second tooth 262 will also descend at the same time. When the turntable 26 descends to the lowest position under the guidance of the first tooth 261, the second tooth 262 disengages from the moving gear 242, and at the same time, the limitation of the limiting ring 263 on the moving gear 242 is also released. At this time, the elastic force of the first spring 243 will push the moving gear 242 to slide on the outer side of the sliding column 241. After the moving gear 242 slides, it meshes with the third tooth 271, which enables the moving gear 242 to drive the displacement plate 27 to rotate. At the same time, the area of the moving gear 242 close to the limiting ring 263 will always support on the top end of the limiting ring 263. At this time, the turntable 26 can always be in the lowest position, and the first tooth 261 is no longer meshed with the second gear 232, realizing automatic fixation and connection switching.

[0039] As Figures 1 to 8 shown in the figure, there are two fixing blocks 21. The two fixing blocks 21 are symmetrically distributed about the horizontal center line of the cooling device 1. A connecting rod 211 is fixedly arranged on the side of the fixing block 21 away from the mounting ring 2. The two fixing blocks 21 are fixedly connected through the connecting rod 211. A limiting rod 216 is arranged on the side of the fixing block 21 close to the mounting ring 2;

[0040] When the fixing block 21 is tightened so that the mounting ring 2 is installed at the top of the cooling device 1, in order to position the fixing block 21 to a position that does not affect the wrapped heat insulation quilt 3, the fixing block 21 needs to be supported by the limiting rod 216, and the limiting rod 216 is used for the contact between the fixing block 21 and the cooling device 1.

[0041] As Figures 1 to 3 shown, four fixing suction cups 25 are fixedly arranged at equal intervals on the outer part of the mounting ring 2;

[0042] After the positioning of the mounting ring 2 is completed, the mounting ring 2 needs to be fixed at the top of the cooling device 1. At this time, the fixing suction cup 25 is pushed to make it adsorb on the top of the cooling device 1.

[0043] As Figures 1 to 6 shown, a guiding rotating rod 223 is fixedly arranged on the side of the rotating frames 22 away from the winding shaft 221. The guiding rotating rod 223 is close to the cooling device 1, and the heat insulation quilt 3 is tightly attached to the outer surface of the guiding rotating rod 223. Two clamping columns 225 are arranged above and below the side of the guiding rotating rod 223 away from the winding shaft 221. The clamping columns 225 are rotatably connected to the rotating frames 22, and a fixing rod 31 is fixedly arranged at one end of the heat insulation quilt 3 away from the winding shaft 221;

[0044] Before wrapping, the heat insulation quilt 3 is wound around the outer part of the winding shaft 221. One end of the heat insulation quilt 3 pulled out will be limited by the guiding rotating rod 223, so that the heat insulation quilt 3 is tightly attached to the surface of the cooling device 1. At the same time, one end of the heat insulation quilt 3 pulled out will be clamped by the clamping columns 225, which is more convenient for its installation.

[0045] As Figures 1 to 8 shown, one end of the rotating frame 22 away from the guiding rotating rod 223 is fixedly provided with a push rod 224 through a connecting block. A rotating column 212 is rotatably connected inside the fixing block 21. A first gear 213 is fixedly arranged at the top of the rotating column 212. A sector gear plate 215 is arranged on the side of the first gear 213 away from the limiting rod 216. The sector gear plate 215 is rotatably connected to the fixing block 21. The first gear 213 is meshed with the sector gear plate 215. A card cover 217 is fixedly arranged at the bottom end of the rotating column 212. The inner diameter of the card cover 217 matches the outer diameter of the fixing rod 31;

[0046] Before the heat-insulating cover 3 is wrapped, the fixing rod 31 needs to be fixed inside the clamping cover 217. Through the limit of the fixing rod 31 by the clamping cover 217, the fixing rod 31 can pull one end of the heat-insulating cover 3 to assist the heat-insulating cover 3 in unrolling and wrapping the cooling device 1. At this time, the motor 24 drives the rotating frame 22 to rotate towards the opening direction of the clamping cover 217. At this time, the rotating frame 22 drives the fixing rod 31 to rotate. When the fixing rod 31 approaches the fixing block 21, it will be filled into the inside of the clamping cover 217. At the same time, the push rod 224 will push the sector gear plate 215 to rotate. The sector gear plate 215 drives the first gear 213 to rotate 180°. At this time, the first gear 213 drives the clamping cover 217 to rotate 180° through the rotating column 212. At this time, the clamping cover 217 can fix the fixing rod 31 inside it, so that one end of the heat-insulating cover 3 is fixed. Subsequently, the motor 24 drives the rotating frame 22 to rotate in the reverse direction. At this time, the fixing rod 31 is in a fixed state. When the rotating frame 22 rotates, it can unfold the heat-insulating cover 3 and wrap it around the outside of the cooling device 1, and the automatic fixing of the fixing rod 31 can be realized.

[0047] As Figures 1 to 8 As shown in the figure, a sliding rod is fixed at one end of the limiting rod 216 close to the rotating column 212. A guiding groove 214 is formed on one side of the rotating column 212. The sliding rod of the limiting rod 216 extends into the inside of the guiding groove 214. A sliding hole for the lifting of the limiting rod 216 is formed inside the fixing block 21.

[0048] After the fixing block 21 is positioned, the limiting rod 216 will affect the wrapping of the heat-insulating cover 3. Therefore, when the rotating column 212 rotates, it will drive the sliding rod of the limiting rod 216 to move through the guiding groove 214. At the same time, under the limiting action of the sliding hole inside the fixing block 21, the limiting rod 216 can move linearly upward. At this time, the limiting rod 216 is separated from the cooling device 1, which can prevent the limiting rod 216 from affecting the wrapping of the heat-insulating cover 3 on the cooling device 1.

[0049] As Figures 1 to 6 As shown in the figure, a torsion spring 222 is fixed on the outside of the winding shaft 221, and the outer side of the torsion spring 222 is fixedly connected to the rotating frame 22;

[0050] After the rotating frame 22 unrolls the heat-insulating cover 3 to wrap the cooling device 1, the torsion spring 222 will tighten due to the rotation of the winding shaft 221. When the heat-insulating cover 3 wraps the cooling device 1, the pulling force of the torsion spring 222 pulls the winding shaft 221 in the reverse direction, and the winding shaft 221 drives the heat-insulating cover 3 to tighten, and the heat-insulating cover 3 can be pulled tightly against the outer surface of the cooling device 1.

[0051] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A superconducting magnetic field heat shielding device, characterized in that: The device includes: A cooling device (1) for cooling the superconducting magnet; An insulating blanket (3) is arranged outside the cooling device (1) and is used to wrap the cooling device (1); An automatic wrapping component, used to unfold the insulation blanket (3) rolled up on the outside of the cooling device (1) and wrap it around the outer periphery of the cooling device (1); The automatic wrapping assembly comprises: a mounting ring (2) arranged at the top of a cooling device (1); two rotating frames (22) are arranged on one side of the mounting ring (2); a reel (221) is rotatably connected between the two rotating frames (22); a heat-insulating blanket (3) is wound around the outside of the reel (221); a fixing block (21) is arranged on the other side of the mounting ring (2); a motor (24) is installed on one side of the mounting ring (2); the motor (24) is used to drive the rotating frame (22) to rotate so as to lay the heat-insulating blanket (3) outside the cooling device (1); A displacement plate (27) is rotatably connected to the inside of the mounting ring (2), and a plurality of third teeth (271) are fixed at equal intervals on the bottom end of the displacement plate (27); A rotating arm (23) is arranged on one side of the top of the mounting ring (2); a telescopic rod (233) is arranged inside the rotating arm (23); the bottom end of the rotating arm (23) is fixedly connected to one side of the top of the displacement plate (27) via a connecting plate; a sliding hole for moving the connecting plate at the bottom of the rotating arm (23) is provided at the top of the mounting ring (2); and the telescopic rod (233) on one side close to the rotating frame (22) is fixedly connected to the rotating frame (22); A fixed arm (28) is fixed to the other side of the top of the mounting ring (2), a telescopic rod (233) is also provided inside the fixed arm (28), and one side of the telescopic rod (233) inside the fixed arm (28) is fixedly connected to the fixed block (21); A sliding column (241) is rotatably connected to the inside of the mounting ring (2) via a support plate. Four sliding columns (241) are arranged at equal intervals inside the mounting ring (2). One end of one of the sliding columns (241) is fixedly connected to the end of the rotating shaft of the motor (24). A moving gear (242) is sleeved on the outside of the sliding column (241). The top end of the moving gear (242) can be meshed and connected with the displacement plate (27) via a third tooth (271).

2. A superconducting magnetic field heat shielding device according to claim 1, characterized in that: The telescopic rod (233) is inserted into the interior of the rotating arm (23). The interior of the rotating arm (23) is rotatably connected to a threaded rod (231). The threaded rod (231) and the telescopic rod (233) are threadedly connected. A second gear (232) is fixed to one end of the threaded rod (231) away from the telescopic rod (233). The interior of the mounting ring (2) is rotatably connected to a rotating disk (26). The rotating disk (26) is arranged below the moving gear (242). A circle of the top end of the rotating disk (26) close to the moving gear (242) is provided with a plurality of second teeth (262) at equal intervals. The moving gear (242) can be meshed with the second teeth (262). A circle of the top end of the rotating disk (26) away from the moving gear (242) is provided with a plurality of first teeth (261) at equal intervals. The bottom end of the second gear (232) is meshed with the rotating disk (26) via the first teeth (261). The interior of the fixed arm (28) is provided with the same structure as the interior of the rotating arm (23).

3. A superconducting magnetic field heat shielding device according to claim 2, characterized in that: A bottom plate (264) is arranged below the rotating disk (26), the bottom end of the bottom plate (264) is closely attached to the bottom end of the inside of the mounting ring (2), a plurality of second springs (265) are fixed at equal intervals between the rotating disk (26) and the bottom plate (264), a limiting ring (263) is fixed to the outermost side of the top of the rotating disk (26), the limiting ring (263) is fixedly connected to the second tooth (262), the height of the limiting ring (263) is greater than the height of the second tooth (262), and the height of the limiting ring (263) is equal to the first tooth (261), a first spring (243) is sleeved on one end of the outer side of the sliding column (241) close to the second tooth (262), one end of the first spring (243) is fixedly connected to the sliding column (241), the other end of the first spring (243) is fixedly connected to the moving gear (242), and slopes are arranged on both sides of the first tooth (261).

4. A superconducting magnetic field heat shielding device according to claim 3, characterized in that: A connecting rod (211) is fixed to a side of the fixing block (21) away from the mounting ring (2), the two fixing blocks (21) are fixedly connected via the connecting rod (211), and a limiting rod (216) is provided inside the fixing block (21) on a side close to the mounting ring (2).

5. A superconducting magnetic field heat shielding device according to claim 1, characterized in that: Four fixing suction cups (25) are fixed at equal intervals on the outside of the mounting ring (2).

6. A superconducting magnetic field heat shielding device according to claim 1, characterized in that: A guide rotating rod (223) is fixed on the side of the rotating frame (22) away from the winding shaft (221), the guide rotating rod (223) is close to the side of the cooling device (1), the heat insulating blanket (3) is closely attached to the outer surface of the guide rotating rod (223), two clamping columns (225) are arranged above and below the side of the guide rotating rod (223) away from the winding shaft (221), the clamping columns (225) are rotatably connected to the rotating frame (22), and a fixing rod (31) is fixed to the end of the heat insulating blanket (3) away from the winding shaft (221).

7. A superconducting magnetic field heat shielding device according to claim 6, characterized in that: A push rod (224) is fixed to one end of the rotating frame (22) away from the guide rotating rod (223) via a connecting block. A rotating column (212) is rotatably connected inside the fixed block (21). A first gear (213) is fixed to the top of the rotating column (212). A fan-shaped toothed plate (215) is provided on one side of the first gear (213) away from the limiting rod (216). The fan-shaped toothed plate (215) is rotatably connected to the fixed block (21). The first gear (213) is meshingly connected to the fan-shaped toothed plate (215). A card cover (217) is fixed to the bottom end of the rotating column (212). The inner diameter of the card cover (217) matches the outer diameter of the fixed rod (31).

8. A superconducting magnetic field heat shielding device according to claim 7, characterized in that: A sliding rod is fixed to one end of the limiting rod (216) close to the rotating column (212), a guide groove (214) is provided on one side of the rotating column (212), the sliding rod of the limiting rod (216) extends into the inside of the guide groove (214), and a sliding hole for lifting the limiting rod (216) is provided in the inside of the fixed block (21).

9. A superconducting magnetic field heat shielding device according to claim 1, characterized in that: A coil spring (222) is fixed to the outside of the winding shaft (221), and the outer side of the coil spring (222) is fixedly connected to the rotating frame (22).

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