Magnet coil frame supporting closed-loop connection of stacked superconducting coils and method of use thereof

Abstract

The present invention provides a magnet coil frame and its use method for supporting the closed-loop connection of stacked superconducting coils in the field of superconducting magnet coils, comprising an upper cover plate, a lower cover plate, a coil frame, and a cylinder. The cylinder is distributed on the lower cover plate, the coil frame is connected between the upper and lower cover plates, and the joint of the coil frame is connected to the cylinder. The lead wires at the ends of the coil frame are connected to form a joint to form a closed coil. The joint of the closed coil is wound around the cylinder. When the lead wires at the ends of the coil frame change their position longitudinally, the cylinder provides spiral steering support for the lead wires at the ends of the coil frame and changes their position. The cylinder of the present invention provides support for the steering and connection of the stacked coils, solves the problem of closed-loop connection of stacked coils with high aspect ratios, and ensures the structural stability and compactness of the magnet coils. The coils are fixed by the stacked frame, so that easily damaged devices such as the closed coils are mechanically protected, greatly reducing maintenance and repair costs.

Description

Technical Field

[0001] The present invention relates to the field of superconducting magnet coils, and in particular to a magnet coil skeleton supporting closed-loop connections of stacked superconducting coils and a use method thereof. Background Art

[0002] The current common method for connecting stacked superconducting coils in a closed loop is to secure the coils to a frame and then draw out the superconducting tape to create the closed coils. This method not only results in a complex magnet coil structure, but also makes the drawn-out superconducting tape susceptible to damage, resulting in poor yield and high maintenance costs. Therefore, when assembling the stacked coils into a magnet, a support frame is required to properly secure the joints and coils. This invention addresses this problem.

[0003] A search of prior art patent documents revealed a Chinese utility model patent publication numbered CN212365637U, which discloses a liquid helium-free superconducting magnet coil bobbin structure. This structure, pertaining to the field of liquid helium-free superconducting magnets, addresses the problem of superconducting coil quenching caused by relative frictional heating between adjacent superconducting coils during initial excitation in current superconducting magnet coil bobbin structures. The structure comprises a frame body and a superconducting coil, wherein the frame body is provided with frame wire slots spaced along its axial direction. The frame body also includes an insulating frame within the frame wire slots, which has secondary wire slots for winding the superconducting coils. An epoxy resin layer is provided between adjacent layers of superconducting wire in the superconducting coil, thereby reducing relative slip friction between the superconducting wires in the superconducting coils and the probability of superconducting coil quenching caused by relative frictional heating between adjacent superconducting wires during superconducting coil excitation. Therefore, this document represents a different inventive concept from the method described herein. Summary of the Invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a magnet coil skeleton supporting the closed-loop connection of stacked superconducting coils and a method of using the same.

[0005] According to the present invention, a magnet coil bobbin supporting a closed-loop connection of stacked superconducting coils comprises an upper cover plate, a lower cover plate, a coil bobbin, and a cylinder. The cylinder is distributed on the lower cover plate, the coil bobbin is connected between the upper and lower cover plates, and the joint of the coil bobbin is connected to the cylinder.

[0006] The lead wires at the ends of the coil frame are connected to form a joint to form a closed coil, and the joint of the closed coil is wound around a cylinder. When the lead wires at the ends of the coil frame change their position longitudinally, the cylinder provides spiral steering support for the lead wires at the ends of the coil frame and changes their position.

[0007] In some embodiments, the cylinder includes a smooth cylinder, a first supporting cylinder, and a second supporting cylinder, wherein the smooth cylinder is distributed at one end of the lower cover plate, and the first supporting cylinder and the second supporting cylinder are distributed at the other end of the lower cover plate;

[0008] The smooth cylinder provides spiral steering support when the end lead wires of the coil skeleton change their positions longitudinally, and the joints made of the end lead wires of the coil skeleton are wound around the first supporting cylinder and the second supporting cylinder accordingly.

[0009] In some embodiments, the first supporting cylinder includes a first cylinder, a first protrusion, a second protrusion and a third protrusion, the third protrusion is distributed at one end of the first cylinder, the first protrusion is distributed at the other end of the first cylinder, and the second protrusions are distributed at intervals in the middle of the first cylinder.

[0010] In some embodiments, the second supporting cylinder includes a second cylindrical body, a fourth protrusion, and a fifth protrusion. The fourth protrusion is distributed at one end of the second cylindrical body, and the fifth protrusions are distributed at intervals in the middle of the second cylindrical body.

[0011] In some embodiments, a thread track on the first supporting cylinder is formed between the first protrusion, the second protrusion, and the third protrusion, and a thread track on the second supporting cylinder is formed between the fourth protrusion, the fifth protrusion, and the other end of the second cylinder.

[0012] In some embodiments, the width of the thread tracks on the first supporting cylinder and the second supporting cylinder is greater than or equal to the width of the corresponding joint.

[0013] In some embodiments, the top lead wire of the coil bobbin is first wound around a smooth cylinder to reduce the longitudinal difference, and then butted with the end lead wire to form an end-to-end joint; the remaining adjacent middle lead wires of the coil bobbin are first wound around a smooth cylinder to reduce the longitudinal difference, and then butted in pairs to form an middle joint;

[0014] The head and tail joints are wound around the second supporting cylinder, and the middle joint is wound around the first supporting cylinder to form a coil closed loop connection.

[0015] In some embodiments, the coil skeleton includes a frame and a coil, the frames are stacked and connected, and the coils are respectively wound on the frames;

[0016] The frame includes an upper cake frame, a dividing plate and a lower cake frame. A dividing plate is provided between the upper cake frame and the lower cake frame to provide an isolation surface for the upper cake frame and the lower cake frame.

[0017] The coil includes an upper coil and a lower coil. The upper coil is wound on the upper frame, and the lower coil is wound on the lower frame. The lead wires of the upper coil and the lower coil are on the outermost sides of the coil, and the innermost turns of the upper coil and the lower coil are connected through the gap of the dividing plate.

[0018] The lead wire of the upper coil on the top frame is wound around a smooth cylinder to reduce the longitudinal difference, and then connected to the lead wires of the upper and lower coils of the second frame at the bottom to form an end-to-end joint;

[0019] In the two adjacent frames, the lead wires of the upper and lower coils of the upper frame are wound on a smooth cylinder to reduce the longitudinal difference, and then connected to the lead wires of the upper coil of the lower frame to form an intermediate joint;

[0020] The head and tail joints are wound around the second supporting cylinder, and the middle joint is wound around the first supporting cylinder to form a coil closed loop connection.

[0021] In some embodiments, a circular hole is provided on the upper cover plate, and the circular hole matches the cylinder.

[0022] The present invention also provides a method for using a magnet coil bobbin supporting a closed-loop connection of stacked superconducting coils, comprising the following steps:

[0023] S1. Wind the upper coil on the upper frame, and the lower coil on the lower frame. Connect the innermost lead wires of the upper and lower coils through the splitter. Stack multiple frames to assemble into a coil skeleton for an open-loop superconducting coil.

[0024] S2, winding the lead wire of the upper coil in the top frame around a smooth cylinder to reduce the longitudinal difference, and then connecting it with the lead wire of the lower coil in the second frame at the bottom to form an end-to-end joint;

[0025] S3. Wind the lead wire of the lower coil in the upper frame of the two adjacent frames around a smooth cylinder to reduce the longitudinal difference, and then connect it with the lead wire of the upper coil in the lower frame to form an intermediate joint;

[0026] S4, wrapping the head and tail joints around the second support cylinder along the thread track of the second support cylinder, and wrapping the middle joint around the first support cylinder along the thread track of the first support cylinder;

[0027] S5. Connect the upper cover, coil frame and lower cover in sequence through fixing parts.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The present invention provides support for the turning and connection of the stacked coils by using four cylinders on the lower cover plate, thereby solving the problem of closed-loop connection of stacked coils with high aspect ratios and ensuring the structural stability and compactness of the magnet coils;

[0030] (2) The present invention fixes the superconducting magnet coils through a support frame, and the superconducting coils are stacked and placed, and the closed coils and other easily damaged components are mechanically protected, which greatly reduces the maintenance and repair costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 Schematic diagram of the structure of the lower cover plate in the present invention;

[0034] Figure 3a Schematic diagram of the specific structure of the smooth cylinder in the present invention;

[0035] Figure 3b Schematic diagram of the specific structure of the first supporting cylinder in the present invention;

[0036] Figure 3c Schematic diagram of the specific structure of the second supporting cylinder in the present invention;

[0037] Figure 4 This is a schematic diagram of the output of a single-pancake coil in the prior art;

[0038] Figure 5 Schematic diagram of the structure of the coil in Example 3;

[0039] Figure 6 Schematic diagram of the structure of the frame in the present invention;

[0040] Figure 7a Schematic diagram of a closed-loop connection of two stacked coils using a first supporting cylinder in Example 4;

[0041] Figure 7b Schematic diagram of a closed-loop connection of two stacked coils using a second supporting cylinder in Example 4;

[0042] Figure 8a Schematic diagram of a closed-loop connection of multiple stacked coils using a first supporting cylinder in Example 5;

[0043] Figure 8b Schematic diagram of a closed-loop connection of multiple stacked coils using a second supporting cylinder in Example 5;

[0044] Figure 9a Schematic diagram of the winding of the joint on the first supporting cylinder in the present invention;

[0045] Figure 9b Schematic diagram of the winding of the joint on the second supporting cylinder in the present invention.

[0046] Numbers in the figure:

[0047] Upper cover plate 1, lower cover plate 2, coil skeleton 3, frame body 31, upper cake frame body 311, dividing plate 312, lower cake frame body 313, coil 32, upper cake coil 321, lower cake coil 322, smooth cylinder 4, first supporting cylinder 5, first cylinder 51, first protrusion 52, second protrusion 53, third protrusion 54, first connecting block 55, second supporting cylinder 6, second cylinder 61, fourth protrusion 62, fifth protrusion 63, second connecting block 64. DETAILED DESCRIPTION

[0048] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0049] Example 1

[0050] The present invention provides a magnet coil bobbin for supporting a closed-loop connection of stacked superconducting coils. The bobbin comprises an upper cover plate 1, a lower cover plate 2, a coil bobbin 3, and a cylinder. The cylinder is distributed on the lower cover plate 2, and the coil bobbin 3 is connected between the upper and lower cover plates 1 and 2, with the joint of the coil bobbin 3 connected to the cylinder. The upper cover plate 1 has four evenly distributed circular holes, which are connected to the cylinders in a one-to-one correspondence.

[0051] Working principle: The lead wires at the ends of the coil frame 3 are connected to form a joint to form a closed coil, and the joint of the closed coil is wound around a cylinder. When the lead wires at the ends of the coil frame 3 change their position longitudinally, the cylinder provides spiral steering support for the lead wires at the ends of the coil frame 3 and changes their position.

[0052] Example 2

[0053] This embodiment 2 is completed on the basis of embodiment 1. Through the structure of the first supporting cylinder 5 and the second supporting cylinder 6, a thread track is formed on the surface thereof, so that the corresponding joint is not easily damaged when winding. Specifically:

[0054] The cylinder includes a smooth cylinder 4, a first supporting cylinder 5 and a second supporting cylinder 6. The first supporting cylinder 5 and the second supporting cylinder 6 are respectively located on the straight edges of the lower cover 2 on both sides of the smooth cylinder 4. The smooth cylinder 4 is symmetrically distributed at one end of the lower cover 2, and the first supporting cylinder 5 and the second supporting cylinder 6 are symmetrically distributed at the other end of the lower cover 2. Figure 3a As shown, the smooth cylinder 4 is a flat cylinder, as shown in Figure 3b 、 3cAs shown, the first supporting cylinder 5 and the second supporting cylinder 6 are concave cylinders. The smooth cylinder 4 provides spiral steering support when the lead wire at the end of the coil bobbin 3 changes its position longitudinally. The first supporting cylinder 5 and the second supporting cylinder 6 are provided with a thread track, which allows the joint of the closed coil to change its position longitudinally.

[0055] like Figure 3b The first support cylinder 5 includes a first cylindrical body 51, a first protrusion 52, a second protrusion 53, and a third protrusion 54. The third protrusion 54 is located at one end of the first cylindrical body 51, the first protrusion 52 is located at the other end of the first cylindrical body 51, and multiple second protrusions 53 are spaced apart in the middle of the first cylindrical body 51. The first protrusion 52, the second protrusion 53, and the third protrusion 54 form a threaded track on the first support cylinder 5.

[0056] like Figure 3c The second support cylinder 6 comprises a second cylindrical body 61, a fourth protrusion 62, and a fifth protrusion 63. The fourth protrusion 62 is located at one end of the second cylindrical body 61, and a plurality of fifth protrusions 63 are spaced apart in the middle of the second cylindrical body 61. A threaded track is formed on the second support cylinder 6 between the fourth protrusion 62, the fifth protrusion 63, and the other end of the second cylindrical body 61.

[0057] Preferably, multiple third protrusions 54 are spaced apart at one end of the first cylinder 51, and multiple first protrusions 52 are spaced apart at the other end of the first cylinder 51, thereby reducing the weight of the first support cylinder 5. Multiple fourth protrusions 62 are spaced apart at one end of the second cylinder 61, thereby reducing the weight of the second support cylinder 6.

[0058] Because coil 32 is made of superconducting tape, and superconducting materials have a high aspect ratio, bending the tape in the width direction can easily damage the tape. Therefore, in this embodiment, the width of the threaded tracks on the first and second support cylinders 5 and 6 is greater than or equal to the width of the corresponding joints, preventing damage to the superconducting tape when wound around the threaded tracks.

[0059] Working principle: The top lead wire of the coil frame 3 is first wound around the smooth cylinder 4 to reduce the longitudinal difference, and then butted with the end lead wire to form the end joint; the remaining adjacent middle lead wires of the coil frame 3 are first wound around the smooth cylinder 4 to reduce the longitudinal difference, and then butted in pairs to form the middle joint; Figure 9b As shown, the head and tail joints are wound around the spiral track of the second support cylinder 6, as shown in FIG. Figure 9a As shown, the middle joint is wound around the spiral track of the first supporting cylinder 5 to form a coil closed loop connection.

[0060] Example 3

[0061] This embodiment 3 is completed on the basis of embodiment 2. The coils 32 are connected in pairs through lead wires to form a closed loop connection. Specifically:

[0062] like Figure 5-6 As shown, the coil skeleton 3 includes a frame 31 and a coil 32. The frames 31 are stacked and connected, and the coils 32 are wound on the frames 31 respectively. The frame 31 includes an upper frame 311, a dividing plate 312 and a lower frame 313. A dividing plate 312 is provided between the upper frame 311 and the lower frame 313. The dividing plate 312 provides an isolation surface for the upper frame 311 and the lower frame 313. The coil 32 includes an upper coil 321 and a lower coil 322. The upper coil 321 is wound on the upper frame 311, and the lower coil 322 is wound on the lower frame 313. As shown Figure 6 As shown, the innermost lead wires of the upper pancake coil 321 and the lower pancake coil 322 are connected through the gap of the dividing plate 312, as shown in FIG. Figure 5 As shown, the lead wires of the outermost turns of the upper pancake coil 321 and the lower pancake coil 322 are on the outermost sides of the coils for easy connection.

[0063] Working principle: Connect the innermost turn lead wires of the upper pancake coil 321 and the lower pancake coil 322, then wind the lead wire of the upper pancake coil 321 in the top frame 31 around the smooth cylinder 4 to reduce the longitudinal difference, and then connect it to the lead wire of the lower pancake coil 322 in the bottom frame 31 to form an end-to-end joint. Then, wind the lead wire of the lower pancake coil 322 in the top frame 31 around the smooth cylinder 4 to reduce the longitudinal difference, and then connect it to the lead wire of the upper pancake coil 321 in the adjacent lower frame 31 to form an intermediate joint, and so on, until it is connected to the lead wire of the upper pancake coil 321 in the bottom frame 31, so that the coil skeleton 3 forms a closed loop connection. Finally, as Figures 9a-9b As shown, the head and tail joints are connected around the second support cylinder 6 along the thread track of the second support cylinder 6, and the middle joint is connected around the first support cylinder 5 along the thread track of the first support cylinder 5.

[0064] Example 4

[0065] This embodiment 4 is completed on the basis of embodiment 3, and two frames 31 are stacked to form a closed loop connection. Specifically:

[0066] like Figures 7a-7b As shown, the lead wire of the upper pancake coil 321 of the upper frame 31 is first wound around the smooth cylinder 4, so that the lead wire is changed in position in the longitudinal direction by rotational winding, so that it is kept on the same horizontal line with the lead wire of the lower pancake coil 322 of the lower frame 31, and then the two lead wires are docked to form a head-to-tail joint, and the head-to-tail joint is wound around the bottom of the second support cylinder 6 according to its own longitudinal height.

[0067] The lead wire of the lower pancake coil 322 of the upper frame 31 is first wound on the smooth cylinder 4, so that the lead wire is changed in position in the longitudinal direction by rotational winding, so that it is kept on the same horizontal line with the lead wire of the upper pancake coil 321 of the lower frame 31, and then the two lead wires are connected to form an intermediate joint, and the intermediate joint is wound on the first support cylinder 5 according to its own longitudinal height.

[0068] Example 5

[0069] This embodiment 5 is completed on the basis of embodiment 3, and multiple frames 31 are stacked to form a closed loop connection. Specifically:

[0070] like Figures 8a-8b As shown, four smooth cylinders 4 are stacked in pairs, placed on either side of the lower cover 2, with the height of the two stacked smooth cylinders 4 higher than the lead wires of the upper coil 321 of the upper frame 31. Two first support cylinders 5 are stacked, with the threaded track of the top of each first support cylinder 5 higher than the lead wires of the upper coil 321 of the middle frame 31.

[0071] The lead wire of the upper pancake coil 321 of the upper frame 31 is first wound around the smooth cylinder 4, so that the lead wire changes its position in the longitudinal direction through rotational winding, so that it is kept on the same horizontal line as the lead wire of the lower pancake coil 322 of the lower frame 31, and then the two lead wires are docked to form an end-to-end joint, and the end-to-end joint is wound around the bottom thread track of the second support cylinder 6 according to its own longitudinal height.

[0072] The lead wire of the lower pancake coil 322 of the upper frame 31 is first wound around the smooth cylinder 4, so that the lead wire is changed in position in the longitudinal direction by rotational winding, so that it is kept on the same horizontal line with the lead wire of the upper pancake coil 321 of the middle frame 31, and then the two lead wires are connected to form an intermediate joint, and the intermediate joint is wound around the corresponding thread track of the first support cylinder 5 according to its own longitudinal height.

[0073] The lead wire of the lower pancake coil 322 of the middle frame 31 is first wound on the smooth cylinder 4, so that the lead wire is changed in position in the longitudinal direction by rotational winding, so that it is kept on the same horizontal line with the lead wire of the upper pancake coil 321 of the lower frame 31, and then the two lead wires are connected to form an intermediate joint, and the intermediate joint is wound on the corresponding thread track of the first support cylinder 5 according to its own longitudinal height.

[0074] More specifically, as the number of frames 31 increases, the number of stacked coils 32 increases. As the number of coils 32 increases, the height of the first supporting cylinder 5 for surrounding the intermediate joint and the smooth cylinder 4 for providing a turning direction for the lead-out strip also increases accordingly. The smooth cylinder 4 can provide a turning direction for multiple lead-out wires, and multiple intermediate joints can be wound around the first supporting cylinder 5.

[0075] like Figures 8a-8b As shown, the closed loop connection of 3 stacked coils is hidden in the figure for the convenience of display. Figure 1 The preferred embodiment of the frame of some components, such as the upper cover 1, and increases the height between the stacked coils 32. In addition, the winding method of the joint on the first support cylinder 5 and the second support cylinder 6 is Figure 9a-9b More connection methods of the stacked coil 32 can be found in Figures 8a-8b , just increase the height of the corresponding cylinder.

[0076] Example 6

[0077] The present invention further provides a method for using the magnet coil bobbin supporting the closed-loop connection of stacked superconducting coils according to any one of embodiments 1 to 5, comprising the following steps:

[0078] S1. Wind the upper coil 321 on the upper frame 311 and the lower coil 322 on the lower frame 313. Connect the innermost lead wires of the upper coil 321 and the lower coil 322 through the splitter 312. Stack multiple frames 31 to form the coil bobbin 3 of the open-loop superconducting coil.

[0079] S2, the lead wire of the upper pancake coil 321 in the top frame 31 is wound around the smooth cylinder 4 to reduce the longitudinal difference, and then connected to the lead wire of the lower pancake coil 322 in the second bottom frame 31 to form an end-to-end joint;

[0080] S3. In the two adjacent frames 31, the lead wire of the lower pancake coil 322 in the upper frame 31 is wound around the smooth cylinder 4 to reduce the longitudinal difference, and then connected to the lead wire of the upper pancake coil 321 in the lower frame 31 to form an intermediate joint;

[0081] S4, wrap the head and tail joints around the second support cylinder 6 along the thread track of the second support cylinder 6, and wrap the middle joint around the first support cylinder 5 along the thread track of the first support cylinder 5;

[0082] S5. Connect the upper cover 1 and the lower cover 2 to the upper and lower sides of the coil bobbin 3 respectively through flat head locking screws.

[0083] Example 7

[0084] This embodiment 7 is completed on the basis of any one of embodiments 1-3, using multiple frames 31 stacked and connected, winding the coil to form a coil skeleton 3, and then closing the coil skeleton 3 to form a permanent magnet. Specifically:

[0085] Multiple coils 32 are wound around corresponding frames 31 to form a coil skeleton 3. Coils 32 are superconducting coils, and stacking of superconducting coils can generate a strong magnetic field. Multiple coils 32 are then closed and connected according to the method of the above embodiment to form a closed-loop magnet coil. Due to the zero resistance characteristic of superconducting materials, their magnetic field decays very slowly, and for a certain period of time, they can be used as a permanent magnet with a strong magnetic field.

[0086] More specifically, considering that multiple frames 31 are required in this embodiment, in order to save the volume of the magnet, the closed coil needs to be installed on the inner side of the frame 31 and needs to be fixed to prevent it from moving due to mechanical vibration of the magnet.

[0087] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0088] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A magnet coil skeleton supporting a closed-loop connection of stacked superconducting coils, characterized in that: It comprises an upper cover plate (1), a lower cover plate (2), a coil frame (3) and a cylinder, wherein the cylinder is distributed on the lower cover plate (2), the coil frame (3) is connected between the upper cover plate (1) and the lower cover plate (2), and the joint of the coil frame (3) is connected to the cylinder; The lead wires at the ends of the coil frame (3) are connected to form a joint to form a closed coil, and the joint of the closed coil is wound around the cylinder. When the lead wires at the ends of the coil frame (3) change their positions longitudinally, the cylinder provides spiral steering support for the lead wires at the ends of the coil frame (3) and changes their positions; The cylinder comprises a smooth cylinder (4), a first supporting cylinder (5) and a second supporting cylinder (6), wherein the smooth cylinder (4) is distributed at one end of the lower cover plate (2), and the first supporting cylinder (5) and the second supporting cylinder (6) are distributed at the other end of the lower cover plate (2); The smooth cylinder (4) provides spiral steering support when the lead wire at the end of the coil frame (3) changes position longitudinally, and the joint made of the lead wire at the end of the coil frame (3) is wound around the first supporting cylinder (5) and the second supporting cylinder (6) accordingly; The first supporting cylinder (5) comprises a first cylinder (51), a first protrusion (52), a second protrusion (53) and a third protrusion (54), wherein the third protrusion (54) is distributed at one end of the first cylinder (51), the first protrusion (52) is distributed at the other end of the first cylinder (51), and the second protrusion (53) is distributed at intervals in the middle of the first cylinder (51).

2. The magnet coil bobbin supporting the closed-loop connection of stacked superconducting coils according to claim 1, characterized in that: The second supporting cylinder (6) comprises a second cylinder (61), a fourth protrusion (62) and a fifth protrusion (63), wherein the fourth protrusion (62) is distributed at one end of the second cylinder (61), and the fifth protrusion (63) is distributed at intervals in the middle of the second cylinder (61).

3. The magnet coil bobbin supporting the closed-loop connection of stacked superconducting coils according to claim 2, characterized in that: A thread track on the first supporting cylinder (5) is formed between the first protrusion (52), the second protrusion (53) and the third protrusion (54), and a thread track on the second supporting cylinder (6) is formed between the fourth protrusion (62), the fifth protrusion (63) and the other end of the second cylinder (61).

4. The magnet coil bobbin supporting the closed-loop connection of stacked superconducting coils according to claim 3, characterized in that: The width of the thread tracks on the first supporting cylinder (5) and the second supporting cylinder (6) is greater than or equal to the width of the corresponding joint.

5. The magnet coil bobbin supporting the closed-loop connection of stacked superconducting coils according to claim 1, characterized in that: The top lead wire of the coil frame (3) is first wound around the smooth cylinder (4) to reduce the longitudinal difference, and then docked with the end lead wire to form a head-to-tail joint; the remaining adjacent middle lead wires of the coil frame (3) are first wound around the smooth cylinder (4) to reduce the longitudinal difference, and then docked in pairs to form a middle joint; The head and tail joints are wound around the second supporting cylinder (6), and the middle joint is wound around the first supporting cylinder (5) to form a coil closed loop connection.

6. The magnet coil bobbin for supporting closed-loop connection of stacked superconducting coils according to claim 5, characterized in that: The coil skeleton (3) comprises a frame (31) and a coil (32), the frame (31) is stacked, and the coil (32) is wound around the frame (31) respectively; The frame (31) includes an upper cake frame (311), a dividing plate (312) and a lower cake frame (313), wherein the dividing plate (312) is provided between the upper cake frame (311) and the lower cake frame (313), and the dividing plate (312) provides an isolation surface for the upper cake frame (311) and the lower cake frame (313); The coil (32) comprises an upper coil (321) and a lower coil (322), wherein the upper coil (321) is wound on the upper frame (311), and the lower coil (322) is wound on the lower frame (313), the lead wires of the upper coil (321) and the lower coil (322) are at the outermost sides of the coils, and the innermost turns of the upper coil (321) and the lower coil (322) are connected through the gap of the dividing plate (312); The lead wire of the upper pancake coil (321) on the top frame (31) is wound around the smooth cylinder (4) to reduce the longitudinal difference, and then connected to the lead wire of the lower pancake coil (322) on the bottom frame (31) to form an end-to-end joint; In two adjacent frames (31), the lead wire of the lower pancake coil (322) on the upper frame (31) is wound around the smooth cylinder (4) to reduce the longitudinal difference, and then connected to the lead wire of the upper pancake coil (321) on the lower frame (31) to form an intermediate joint; The head and tail joints are wound around the second supporting cylinder (6), and the middle joint is wound around the first supporting cylinder (5) to form a coil closed loop connection.

7. The magnet coil bobbin supporting the closed-loop connection of stacked superconducting coils according to claim 1, characterized in that: The upper cover plate (1) is provided with a circular hole, and the circular hole matches the cylinder.

8. The method for using a magnet coil bobbin for supporting closed-loop connection of stacked superconducting coils according to claim 6, characterized in that: The following steps are involved: S1, winding the upper pancake coil (321) on the upper pancake frame (311), winding the lower pancake coil (322) on the lower pancake frame (313), and connecting the innermost turn lead wires of the upper pancake coil (321) and the lower pancake coil (322) through the dividing plate (312), stacking a plurality of the frames (31) to assemble the coil skeleton (3) of the open-loop superconducting coil; S2, winding the lead wire of the upper pancake coil (321) in the top frame (31) around the smooth cylinder (4) to reduce the longitudinal difference, and then connecting it with the lead wire of the lower pancake coil (322) in the bottom frame (31) to form an end-to-end joint; S3, in two adjacent frames (31), the lead wire of the lower pancake coil (322) in the upper frame (31) is wound around the smooth cylinder (4) to reduce the longitudinal difference, and then connected to the lead wire of the upper pancake coil (321) in the lower frame (31) to form an intermediate joint; S4, wrapping the head and tail joints around the second supporting cylinder (6) along the threaded track of the second supporting cylinder (6), and wrapping the middle joint around the first supporting cylinder (5) along the threaded track of the first supporting cylinder (5); S5, connecting the upper cover plate (1), the coil frame (3), and the lower cover plate (2) in sequence via fixing members.

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