CN117038246A - Multi-coil jointless superconducting magnet and winding method - Google Patents

Abstract

The invention discloses a multi-coil jointless superconducting magnet and a winding method, which include a superconducting skeleton, an upper flange plate, a lower flange plate, a main coil part, an upper compensation coil part, a lower compensation coil part, and a main transition Slips, upper transition slips, lower transition slips, superconducting wires, and insulating films. The upper and lower ends of the superconducting skeleton are respectively fixed with upper flange plates and lower flange plates. The inner surface of the lower flange plate is There are wire inlet slots and wire outlet slots, a main coil part is provided on the superconducting skeleton, and an upper compensation coil part and a lower compensation coil part are respectively provided at the upper and lower ends of the main coil part, and the main transition slip Transition trunking is provided on the top. The advantage of the present invention is that there are no connecting joints between superconducting coils, which reduces the number of joints of the original superconducting magnet, reduces the energy loss of the superconducting magnet, thereby improving the long-term operating stability of the magnet, and reducing the number of joints of the superconducting magnet. Operational risks in repeated welding and disassembly of superconducting magnets.

Description

A multi-coil jointless superconducting magnet and its winding method

Technical field

The present invention relates to the technical field of superconducting magnets, specifically a multi-coil jointless superconducting magnet and a winding method.

Background technique

Efficient superconducting magnet technology and low-temperature refrigeration technology have been widely used in national economy, scientific experiments, national defense industry, nuclear magnetic resonance, magnetic levitation and other science and technology. Superconducting technology, as a technology with nearly zero resistance and zero energy consumption, enables superconducting magnets to achieve higher currents and stronger magnetic fields at lower voltages. It is widely used in integrated circuits, semiconductors, biomedicine, and new materials. It has extensive application and scientific research value in other fields. The main reason why superconducting magnets cannot achieve completely zero resistance at present is that the superconducting joint itself is an open-circuit connection structure. Currently, no welding material capable of superconducting has been found internationally, so the superconducting joint cannot be used at 4K (-269℃) Achieve zero resistance superconducting state. In this case, there is always a low-resistance heating loss in the entire current loop, causing the current in the loop to continue to decay as time increases.

In the superconducting magnet system, the superconducting joint is a fixed device that connects the two ends of multiple superconducting wires, or a fixed lead-out device in the transition section between the incoming and outgoing wire joints of the superconducting magnet and the external higher temperature zone.

In the existing superconducting magnet technology, after each coil is wound, there will be two connectors for the incoming and outgoing wires. For example, the Chinese patent document No. CN114360846A discloses a multi-coil combination high-field superconducting magnet and According to its production method, each coil wound has two joints. After soldering with solder, these joints are not superconducting at low temperatures, but have a heating resistance. For conduction-cooled superconducting magnets, the cooling power of a refrigerator in the 4K temperature range is only 0.8W to 1.5W. The heat loss of multiple sets of welded superconducting joints generally accounts for more than half of the overall heat loss of the superconducting magnet. Especially in closed-loop superconducting magnet systems (such as nuclear magnetic resonance imaging, nuclear magnetic resonance spectrometers, proton accelerators, etc.). Due to the continuous attenuation of the current, the magnetic field also exhibits a linear attenuation change. The energy loss of the superconducting magnet increases, making it impossible to achieve long-term stable magnetic field operation. Moreover, there are certain risks in the repeated welding and disassembly of superconducting magnet joints.

Contents of the invention

The technical problem to be solved by the present invention is how to provide a method that reduces the number of superconducting magnet joints, reduces the energy loss of the superconducting magnet, improves the long-term operating stability of the magnet, and reduces the stress of the superconducting magnet joints during repeated welding and disassembly. Risks of handling superconducting magnets.

In order to solve the above technical problems, the present invention provides the following technical solutions:

A multi-coil jointless superconducting magnet, including a superconducting skeleton, an upper flange plate, a lower flange plate, a main coil part, an upper compensation coil part, a lower compensation coil part, a main transition slip, an upper transition slip, The lower transition slips, superconducting wires, and insulating films are attached. The upper and lower ends of the superconducting skeleton are respectively fixed with upper flange plates and lower flange plates. The inner surface of the lower flange plate is provided with inlet slots and outlet lines. Notch, a main coil part is provided on the superconducting skeleton, an upper compensation coil part and a lower compensation coil part are respectively provided at the upper and lower ends of the main coil part, and a transition wire trough is provided on the main transition slip;

The tap of the superconducting wire enters the main coil part through the wire inlet slot and is wound to form the main coil and then enters the upper compensation coil part. After laying the insulating film on the main coil, a main transition slip is set; the superconducting wire is compensated on the upper coil part. After the coil part is wound to form the upper compensation coil, its tap enters the lower compensation coil part through the transition slot. After laying the insulating film on the upper compensation coil, an upper transition slip is provided; the superconducting wire is wound in the lower compensation coil part to form the lower compensation coil. After the coil, its tap is led out through the outlet slot. After laying the insulation film on the lower compensation coil, set the lower transition slip.

This superconducting magnet winds multiple superconducting coils through one superconducting wire, which can realize the combination or nesting of multiple layer-wound solenoid coils. It is not limited to a certain coil and can obtain magnets with different magnetic field distribution requirements. , and there are no connecting joints between superconducting coils, which reduces the number of original superconducting magnet joints and reduces the energy loss of the superconducting magnet, thereby improving the long-term operating stability of the magnet and reducing the need for repeated welding and disassembly of superconducting magnet joints. There are operational risks in installing superconducting magnets.

Through the combination of multiple coils, not only the high uniformity winding requirements of nuclear magnetic resonance superconducting magnets, gradient magnet requirements and conduction cooling magnet requirements can be achieved, but also the interpolation of the same material, different number of layers, and number of turns can be achieved Combination to achieve various types of winding requirements for superconducting magnets.

Preferably, a first annular lead-out groove is provided on the inner wall and top surface of the top of the main transition slip, and a second annular lead-out groove is provided on the inner wall and bottom surface of the bottom of the main transition slip. The upper and lower ends of the transition line trough are are respectively connected with the first annular lead-out groove and the second annular lead-out groove.

Preferably, the upper transition slip is provided with an upper transition wire trough connected with the transition wire trough, a third annular lead-out groove is provided on the inner wall and top surface of the top of the upper transition slip, and the bottom of the upper transition slip is A fourth annular lead-out groove is provided on the inner wall and the bottom surface. The upper and lower ends of the upper transition wire trough are respectively connected with the third annular lead-out groove and the fourth lower annular lead-out groove. The first annular lead-out groove and the fourth annular lead-out groove are Corresponding settings.

Preferably, the curvature of the first annular lead-out groove, the second annular lead-out groove, the third annular lead-out groove and the fourth lower annular lead-out groove on the outside of the lead-out copper tile is not less than 30 times the diameter of the superconducting wire, and the transition wire trough is , the width of the upper transition wire trough is not less than 2.5 times the diameter of the superconducting wire, and the depth of the transition wire trough and the upper transition wire trough is greater than the diameter of the superconducting wire.

Preferably, the lower transition slip is provided with a lower transition wire trough, the upper transition slip is provided with a fifth annular lead-out groove on the inner wall and top surface of the top, and the upper and lower ends of the lower transition wire trough are respectively connected with the fifth wire trough. The annular lead-out slot is connected with the outlet slot.

Preferably, the arc of the fifth lower annular lead-out groove outside the lead-out copper tile is not less than 30 times the diameter of the superconducting wire, and the width of the lower transition wire groove is not less than 2.5 times the diameter of the superconducting wire. The depth is greater than the diameter of the superconducting wire.

Preferably, the arc of the fifth lower annular lead-out groove outside the lead-out copper tile is not less than 30 times the diameter of the superconducting wire, and the width of the lower transition wire groove is not less than 2.5 times the diameter of the superconducting wire. The depth is greater than the diameter of the superconducting wire.

Preferably, the upper flange plate and the lower flange plate are oxygen-free copper cooling flange plates.

Preferably, the materials of the main transition slips, upper transition slips and lower transition slips are non-magnetic metal materials or thermally conductive composite materials with high heat transfer efficiency.

Preferably, a method for winding multi-coil jointless superconducting magnets is also provided, including the following steps:

Step 1: Fix the upper flange plate and the lower flange plate to the upper and lower ends of the superconducting skeleton respectively, and lay an insulating film on the inner surfaces of the upper and lower flange plates and the surface of the superconducting skeleton;

Step 2: The tap of the superconducting wire enters the main coil part through the wire inlet slot and is wound to form the main coil and then enters the upper compensation coil part. Then lay the insulating film on the main coil and then set the main transition slip;

Step 3: Lay insulation film on the upper and lower surfaces of the main transition slips;

Step 4: The superconducting wire is wound on the upper compensation coil part to form the upper compensation coil, and then its tap enters the lower compensation coil part through the transition slot, and then lays an insulating film on the upper compensation coil and then sets the upper transition slip;

Step 5: The superconducting wire is wound around the lower compensation coil to form the lower compensation coil, and its tap is led out through the outlet slot. Then, an insulating film is laid on the lower compensation coil and the lower transition slip is set.

Compared with the prior art, the beneficial effects of the present invention are:

This superconducting magnet winds multiple superconducting coils through one superconducting wire, which can realize the combination or nesting of multiple layer-wound solenoid coils. It is not limited to a certain coil and can obtain magnets with different magnetic field distribution requirements. , and there are no connecting joints between superconducting coils, which reduces the number of original superconducting magnet joints and reduces the energy loss of the superconducting magnet, thereby improving the long-term operating stability of the magnet and reducing the need for repeated welding and disassembly of superconducting magnet joints. There are operational risks in installing superconducting magnets.

Through the combination of multiple coils, not only the high uniformity winding requirements of nuclear magnetic resonance superconducting magnets, gradient magnet requirements and conduction cooling magnet requirements can be achieved, but also the interpolation of the same material, different number of layers, and number of turns can be achieved Combination to achieve various types of winding requirements for superconducting magnets.

Description of the drawings

Figure 1 is a schematic structural diagram of an embodiment of the present invention;

Figure 2 is a partial schematic diagram of an embodiment of the present invention;

Figure 3 is a schematic structural diagram of the superconducting wire after winding according to the embodiment of the present invention;

Figure 4 is a schematic diagram of the partial structure of the superconducting wire after winding according to the embodiment of the present invention;

Figure 5 is another partial structural schematic diagram of the superconducting wire after winding according to the embodiment of the present invention;

Figure 6 is a schematic structural diagram of the main transition slip according to the embodiment of the present invention;

Figure 7 is a schematic structural diagram of a transition slip according to an embodiment of the present invention;

Figure 8 is a schematic structural diagram of a transition slip according to an embodiment of the present invention.

Detailed ways

In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention will be further described with reference to the accompanying drawings.

In this application, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two elements or an interaction between two elements . For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In this application, unless otherwise expressly stated and limited, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. quantity. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of this application, "plurality" means two or more than two, unless otherwise explicitly and specifically limited.

Referring to Figures 1 to 3, this embodiment discloses a multi-coil jointless superconducting magnet, which includes a superconducting skeleton 1, an upper flange plate 2, a lower flange plate 3, a main coil part 4, and an upper compensation coil part. 5. Lower compensation coil part 6, main transition slips 7, upper transition slips 8, lower transition slips 9, superconducting wire 10 and insulating film (not shown in the figure), the superconducting skeleton 1 is a middle band through hole The core tube structure, the flanges at both ends of the superconducting skeleton 1 are slightly larger than the inner diameters of the upper flange plate 2 and the lower flange plate 3, and the flange plate 2 and the lower flange plate 3 are respectively fixed by bolts. In this embodiment, The upper flange plate 2 and the lower flange plate 4 are both oxygen-free copper cold-conducting flange plates. The flange plate 2 and the lower flange plate 3 play a role in fixing the superconducting magnet coil. When winding, Tighten each layer of superconducting wire 10 and the transition section between layers, and use oxygen-free copper, which has a higher material thermal conductivity than non-magnetic stainless steel at 4K deep and low temperature (-269°C), to cool the internal superconducting coil to achieve More uniform cooling temperature.

The inner surface of the lower flange plate 3 is provided with a wire inlet slot 301 and a wire outlet slot 302. The superconducting frame 1 is provided with a main coil part 4, and the upper and lower ends of the main coil part 4 are respectively provided with The upper compensation coil part 5 and the lower compensation coil part 6 are provided with a transition wire groove 701 on the main transition slip 7 .

Referring to Figures 3 to 5, the tap of the superconducting wire 10 enters the main coil part 4 through the wire inlet slot 301 and is wound to form the main coil and then enters the upper compensation coil part 5. An insulating film is laid on the main coil and then the main coil is set. Transition slip 7; the superconducting wire 10 is wound on the upper compensation coil part 5 to form an upper compensation coil, and its tap enters the lower compensation coil part 6 through the transition wire slot 701. An insulating film is laid on the upper compensation coil and then the upper transition is set. Slips 8; the superconducting wire 10 is wound around the lower compensation coil part 6 to form a lower compensation coil, and its tap is led out through the outlet slot 302. After laying an insulating film on the lower compensation coil, a lower transition slip 9 is provided.

This superconducting magnet winds multiple superconducting coils through one superconducting wire, which can realize the combination or nesting of multiple layer-wound solenoid coils. It is not limited to a certain coil and can obtain magnets with different magnetic field distribution requirements. , and there are no connecting joints between superconducting coils, which reduces the number of original superconducting magnet joints and reduces the energy loss of the superconducting magnet, thereby improving the long-term operating stability of the magnet and reducing the need for repeated welding and disassembly of superconducting magnet joints. There are operational risks in installing superconducting magnets.

Through the combination of multiple coils, not only the high uniformity winding requirements of nuclear magnetic resonance superconducting magnets, gradient magnet requirements and conduction cooling magnet requirements can be achieved, but also the interpolation of the same material, different number of layers, and number of turns can be achieved Combination to realize various types of winding requirements for superconducting magnets. Specifically, it can be applied to concave coils, chevron-shaped coils, long coil combination pairs, split coil pairs, hollow cylindrical coils, and gradient coil combinations for multiple coil combinations. Equivalent to solenoid-type coils and L-shaped coils with axially symmetrical structures, but they are not suitable for pie-type coils.

In addition, it should be noted that when designing multiple pairs of superconducting coils, most of them have symmetrical structures. In order to ensure that the center of the magnetic field is located at the exact center of the coil pair to obtain a higher central magnetic field intensity or to obtain a higher central magnetic field uniformity, The number of compensation coils generally appears in pairs, such as 2, 4, or 6 compensation coils, which are set according to actual needs. In this embodiment, the number of compensation coils is 2, but is not limited to 2. Multiple compensation coils can be wound on the main coil to divide the main transition slips 7 into multiple slips, and add additional slips. A slip is provided on the compensation coil.

Furthermore, the superconducting skeleton 1 is a material with a certain structural strength. For superconducting magnets that require heat treatment, it should also meet the requirements of high-temperature heat treatment. Its thermal expansion coefficient should be less than or equal to the thermal expansion coefficient of the superconducting wire, including but not limited to 5083 series aluminum alloy, 6061 series aluminum alloy, 304, 304L, 316L, 316LN, Ti6AlV4, Cr-based alloy, Ni-based alloy or other types of materials with higher structural strength.

Furthermore, the upper flange plate 2 and the lower flange plate 3 are provided with vertically penetrating slits, so that the upper flange plate 2 and the lower flange plate 3 have a Huff structure, eliminating the possibility of interference when the superconducting coil is excited. To produce an eddy current loss effect, the light holes on the upper flange plate 2 and the lower flange plate 3 are used to connect the external support structure of the magnet, and the two pairs of 2x2 bolt holes are used to fix the external cooling connectors and cool the superconducting wires.

Further, the materials of the main transition slips 7, the upper transition slips 8 and the lower transition slips 9 are non-magnetic metal materials or thermally conductive composite materials with high heat transfer efficiency, and have a high 4K low temperature thermal conductivity (- 269℃), the reference value should be no less than 300W/(m·K)@4K, and the thermal expansion coefficient is close to that of the superconducting wire 10. Its materials include but are not limited to TU00 high-conducting oxygen-free copper, TU0 high-conducting oxygen-free copper, TU1 High conductivity oxygen-free copper, silver-based alloy, gold-based alloy, etc. In this embodiment, the main transition slips 7, the upper transition slips 8 and the lower transition slips 9 are all made of oxygen-free copper tiles to achieve non-liquid helium conduction cooling and can meet the conduction cooling needs of high conductivity materials.

Further, referring to Figure 6, a first annular lead-out groove (not shown) is provided on the top inner wall and top surface of the main transition slip 7, and a third annular lead-out groove is provided on the bottom inner wall and bottom surface of the main transition slip 7. Two annular lead-out grooves 702, the upper and lower ends of the transition wire trough 701 are respectively connected with the first annular lead-out groove and the second annular lead-out groove 702.

Referring to Figure 7, the upper transition slip 8 is provided with an upper transition wire trough 801 connected with the transition wire trough 701, and a third annular lead-out groove 802 is provided on the inner wall and top surface of the top of the upper transition slip 8, so A fourth annular lead-out groove (not shown in the figure) is provided on the inner wall and bottom surface of the bottom of the transition slip 8. The upper and lower ends of the upper transition wire groove 801 are respectively connected with the third annular lead-out groove 802 and the fourth lower annular lead-out groove. Communicated, the first annular lead-out groove and the fourth annular lead-out groove are arranged correspondingly.

After the upper compensation coil is wound, in order to reduce the number of superconducting joints, the tap of the superconducting wire 10 is not led out from the upper flange plate 2, but is transferred to the lower compensation coil through the outer transition slot 70 of the main transition slip 7 Part 6 continues to wind. Specifically, referring to FIGS. 4 and 5 , when the number of winding layers of the upper compensation coil of the upper compensation coil part 5 is an even number, the superconducting wire 10 is led out from the third annular lead-out slot 802 to the upper transition wire slot 801 and then enters the transition wire slot 701 ; When the number of winding layers of the upper compensation coil of the upper compensation coil part 5 is an odd number, the superconducting wire 10 is led out to the transition wire slot 701 through the fourth annular lead-out groove and the first annular lead-out groove.

Referring to Figure 8, the lower transition slip 9 is provided with a lower transition wire trough 901. The top inner wall and top surface of the upper transition slip 9 are provided with a fifth annular lead-out slot 902. The lower transition wire trough 901 The upper and lower ends are connected to the fifth annular lead-out slot 902 and the outlet slot 302 respectively.

Specifically, referring to Figure 3, when the number of winding layers of the lower compensation coil of the lower compensation coil part 6 is an even number, the superconducting wire 10 is led out from the fifth annular lead-out slot 902 to the lower transition wire slot 901 and then out from the outlet slot 302; When the number of winding layers of the lower compensation coil of the lower compensation coil part 6 is an odd number, the superconducting wire 10 is directly led out from the outlet slot 302 .

Furthermore, the shapes of the first annular lead-out groove, the second annular lead-out groove 702, the third annular lead-out groove 802, the fourth lower annular lead-out groove and the fifth lower annular lead-out groove 902 are the same, and the first annular lead-out groove, The curvature of the second annular lead-out groove 702, the third annular lead-out groove 802, the fourth lower annular lead-out groove and the fifth lower annular lead-out groove 902 on the outside of the lead-out copper tile is not less than 30 times the diameter of the superconducting wire 10, and is a large radius transition. , the last turn of the annular lead-out section of the superconducting coil, the length of the annular lead-out groove is not less than 1/4 of the circumference of the copper tile to avoid cuts or sprains on the superconducting wire 10; the transition wire trough 701, the upper transition wire trough The width of the transition wire trough 801 and the lower transition wire trough 901 is not less than 2.5 times the diameter of the superconducting wire 10. The depth of the transition wire trough 701, the upper transition wire trough 801 and the lower transition wire trough 901 is greater than the diameter of the superconducting wire 10, ensuring that the transition wire trough 701 , there is enough space to fill the upper transition wire trough 801 and the lower transition wire trough 901 with potting glue. Specifically, Stycast low-temperature thermally conductive glue (AB type) is used to pott the wire troughs to ensure that the superconducting wire 10 is electrically insulated from the copper tile, and The superconducting wire 10 is not higher than the outer surface of the copper tile to prevent the superconducting wire 10 from being crushed when the outer binding wire is wound.

Furthermore, the outer diameter of the main transition slip 7 is larger than the outer diameters of the upper compensation coil and the lower compensation coil.

Further, the type of the superconducting wire 10 is a round wire, a rectangular wire, a small cable composed of a composite multi-strand wire, etc., including but not limited to NbTi/Cu, Nb3Sn, Bi2212, iron wire, Bi2223, YBCO and other low-temperature or High temperature superconducting materials.

This embodiment also provides a method for winding a multi-coil jointless superconducting magnet, which specifically includes the following steps:

Step 1: Fix the upper flange plate 2 and the lower flange plate 3 to the upper and lower ends of the superconducting skeleton 1 through bolts respectively, on the inner surfaces of the upper flange plate 2 and the lower flange plate 3 and the surface of the superconducting skeleton 1 Lay a layer of insulation film;

Step 2: The tap of the superconducting wire 10 enters the main coil part 4 through the wire inlet slot 301 and is wound to form a main coil and then enters the upper compensation coil part 5. Then, an insulating film is laid on the main coil and the main transition slip 7 is fixed;

Step 3: Lay insulation film on the upper and lower surfaces of the main transition slip 7;

Step 4: The superconducting wire 10 is wound around the upper compensation coil part 5 to form an upper compensation coil, and then an insulating film is laid on the upper compensation coil and then an upper transition slip 8 is provided. When the number of winding layers of the upper compensation coil is an even number, the superconducting wire 10 is wound to form an upper compensation coil. The wire 10 is led out from the third annular lead-out groove 802 on the upper transition slip 8 to the upper transition wire trough 801, and then is led from the transition wire trough 701 to the lower compensation coil part 6; when the number of winding layers of the upper compensation coil is an odd number, the super The wire 10 is led out from the fourth annular lead-out groove at the bottom of the upper transition slip 8 and the first annular lead-out groove on the main transition slip 7 to the transition wire groove 701 and then to the lower compensation coil part 6;

Step 5: The superconducting wire 10 is wound on the lower compensation coil part 6 to form a lower compensation coil, and then an insulating film is laid on the lower compensation coil and then the lower transition slip 9 is set. The number of winding layers of the lower compensation coil of the lower compensation coil part 6 is an even number. When It is led out from the outlet slot 302.

Through the above winding method and optimized coil winding process, multiple sets of coils can be wound with one wire, which reduces the number of original superconducting joints, greatly reduces the energy loss of the superconducting magnet, and improves the long-term operation of the magnet. The stability also reduces the operational risks of superconducting magnet joints during repeated welding and disassembly.

It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as illustrative and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is therefore intended that all claims falling within the claims All changes within the meaning and scope of equivalent elements are encompassed by the present invention, and any reference signs in a claim should not be construed as limiting the claim involved.

The above-described embodiments only represent implementation modes of the invention. The protection scope of the present invention is not limited to the above-mentioned embodiments. For those skilled in the art, several modifications and changes can be made without departing from the concept of the present invention. Improvements, these all belong to the protection scope of the present invention.

Claims (10)

1. A multi-coil jointless superconducting magnet, characterized by: including a superconducting skeleton, an upper flange plate, a lower flange plate, a main coil part, an upper compensation coil part, a lower compensation coil part, and a main transition slip , upper transition slips, lower transition slips, superconducting wires, insulating films, the upper and lower ends of the superconducting skeleton are respectively fixed with upper flange plates and lower flange plates, and the inner surface of the lower flange plate is provided with The main coil part is provided on the superconducting skeleton, the upper and lower ends of the main coil part are respectively provided with upper compensation coil part and the lower compensation coil part, and the main transition slip is provided with There are transitional trunking; The tap of the superconducting wire enters the main coil part through the wire inlet slot and is wound to form the main coil and then enters the upper compensation coil part. After laying the insulating film on the main coil, a main transition slip is set; the superconducting wire is compensated on the upper coil part. After the coil part is wound to form the upper compensation coil, its tap enters the lower compensation coil part through the transition slot. After laying the insulating film on the upper compensation coil, an upper transition slip is provided; the superconducting wire is wound in the lower compensation coil part to form the lower compensation coil. After the coil, its tap is led out through the outlet slot. After laying the insulation film on the lower compensation coil, set the lower transition slip. 2. A multi-coil jointless superconducting magnet according to claim 1, characterized in that: a first annular lead-out groove is provided on the inner wall and top surface of the top of the main transition slip, and the main transition slip is A second annular lead-out groove is provided on the inner wall and bottom surface of the bottom, and the upper and lower ends of the transition wire trough are respectively connected with the first annular lead-out groove and the second annular lead-out groove. 3. A multi-coil jointless superconducting magnet according to claim 2, characterized in that: the upper transition slip is provided with an upper transition slot connected to the transition slot, and the upper transition slip is A third annular lead-out groove is provided on the inner wall and top surface of the top, a fourth annular lead-out groove is provided on the inner wall and bottom surface of the upper transition slip, and the upper and lower ends of the upper transition wire groove are respectively connected with the third annular lead-out groove and The fourth lower annular lead-out groove is connected, and the first annular lead-out groove and the fourth annular lead-out groove are arranged correspondingly. 4. A multi-coil jointless superconducting magnet according to claim 3, characterized in that: the first annular lead-out groove, the second annular lead-out groove, the third annular lead-out groove and the fourth lower annular lead-out groove The arc outside the lead-out copper tile is not less than 30 times the diameter of the superconducting wire, the width of the transition wire trough and the upper transition wire trough is not less than 2.5 times the diameter of the superconducting wire, and the depth of the transition wire trough and the upper transition wire trough is greater than superconducting wire diameter. 5. A multi-coil jointless superconducting magnet according to claim 1, characterized in that: a lower transition slot is provided on the lower transition slip, and the inner wall and top surface of the top of the upper transition slip are A fifth annular lead-out trough is provided, and the upper and lower ends of the lower transition wire trough are respectively connected with the fifth annular lead-out trough and the outlet slot. 6. A multi-coil jointless superconducting magnet according to claim 5, characterized in that: the arc of the fifth lower annular lead-out groove outside the lead-out copper tile is not less than 30 times the diameter of the superconducting wire, and the The width of the lower transition wire trough is not less than 2.5 times the diameter of the superconducting wire, and the depth of the lower transition wire trough is greater than the diameter of the superconducting wire. 7. A multi-coil jointless superconducting magnet according to claim 1, characterized in that: both the upper flange plate and the lower flange plate are provided with vertically penetrating slits, so that the upper flange plate and the lower flange plate have a Huff structure. 8. A multi-coil jointless superconducting magnet according to claim 1, characterized in that: the upper flange plate and the lower flange plate are oxygen-free copper cooling flange plates. 9. A multi-coil jointless superconducting magnet according to claim 1, characterized in that: the materials of the main transition slips, upper transition slips and lower transition slips are non-magnetic metal materials or high-transmission slips. Thermal efficiency of thermally conductive composites. 10. A method for winding a multi-coil jointless superconducting magnet according to any one of claims 1 to 9, characterized in that it includes the following steps: Step 1: Fix the upper flange plate and the lower flange plate to the upper and lower ends of the superconducting skeleton respectively, and lay an insulating film on the inner surfaces of the upper and lower flange plates and the surface of the superconducting skeleton; Step 2: The tap of the superconducting wire enters the main coil part through the wire inlet slot and is wound to form the main coil and then enters the upper compensation coil part. Then lay the insulating film on the main coil and then set the main transition slip; Step 3: Lay insulation film on the upper and lower surfaces of the main transition slips; Step 4: The superconducting wire is wound on the upper compensation coil part to form the upper compensation coil, and then its tap enters the lower compensation coil part through the transition slot, and then lays an insulating film on the upper compensation coil and then sets the upper transition slip; Step 5: The superconducting wire is wound around the lower compensation coil to form the lower compensation coil, and its tap is led out through the outlet slot. Then, an insulating film is laid on the lower compensation coil and the lower transition slip is set.