A high-coaxiality high-temperature superconducting magnet skeleton device

Abstract

The present invention discloses a high-coaxiality high-temperature superconducting magnet skeleton device. This device belongs to the field of high-temperature superconducting technology. The skeleton device comprises an outer skeleton, an inner skeleton, an S-end double-cone structure, an S-end force-bearing plate, an S-end upper insulating plate, an S-end bearing plate, an S-end lower insulating plate, an S-end inner fixing plate, an S-end upper end plate, a P-end double-cone structure, a P-end force-bearing plate, a P-end upper insulating plate, a P-end bearing plate, a P-end lower insulating plate, and a P-end lower end plate. Double-cone structures are mounted on both sides of the S-end upper end plate and the P-end lower end plate. The double-cone structure not only provides support but also ensures the coaxiality of the magnet and the dewar structure. The present invention addresses the issues of limited axial size of high-temperature superconducting magnets, high skeleton coaxiality, and application of axial preload force to the coils, thereby designing a novel skeleton. Therefore, the present invention eliminates the axial size restrictions of the magnet to a certain extent and meets the high coaxiality requirements between high-temperature superconducting coils, which facilitates the magnet to generate magnetic flux lines of a specific shape.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature superconductivity, in particular to a high-temperature superconducting magnet skeleton device with high coaxiality. Background Art

[0002] High-temperature superconducting magnets are mainly composed of high-temperature superconducting coils and coil frames, of which the coil frame is an important structural basis for ensuring the size and position accuracy requirements of the magnet. For high-temperature superconducting magnets that require a certain shape of magnetic lines of force, or magnets with a double-layer coil structure, high coaxiality and position accuracy are required between the inner and outer layers of superconducting coils. At the same time, due to the requirements of the magnetic line shape, the high-temperature superconducting magnet may be restricted in axial size and cannot be fixed or preloaded. When faced with the above multiple situations, the traditional frame design scheme cannot meet the above multiple requirements at the same time. This greatly limits the design of electromagnetic schemes and the processing technology of high-temperature superconducting magnets.

[0003] Therefore, it is urgent to provide a skeleton device to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-coaxiality high-temperature superconducting magnet skeleton device to solve the engineering and technical problems mentioned in the background technology, so as to effectively ensure the position accuracy requirements of the inner and outer layers of high-temperature superconducting coils in the mechanical structure to achieve the designed magnetic flux line configuration requirements.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A high-temperature superconducting magnet skeleton device with high coaxiality comprises: an outer skeleton and an inner skeleton, an S-end upper end plate and a P-end lower end plate are respectively provided at the upper and lower ends of the inner skeleton, an S-end inner fixing plate is provided on the lower side of the S-end upper end plate, the inner skeleton and the S-end inner fixing plate are nested inside the outer skeleton, an S-end force plate and a P-end force plate are respectively provided at both ends of the outer skeleton, an S-end force plate and a P-end force plate are respectively provided on the inner sides of the S-end force plate and the P-end force plate, the S-end force plate and the P-end force plate are tightly fitted with the outer skeleton through a matching surface, an S-end bearing plate and a P-end bearing plate are respectively provided on the inner side of the outer skeleton, the S-end bearing plate and the P-end bearing plate are consolidated on the outer skeleton through a positioning surface, an S-end lower insulating plate and a P-end lower insulating plate are respectively provided on the upper sides of the S-end bearing plate and the P-end bearing plate, and an operating hand hole and a heat sink mounting seat are provided on the cylinder surface of the outer skeleton. The S-end upper end plate and the P-end lower end plate are respectively provided with an S-end double-cone structure and a P-end double-cone structure. A high-temperature superconducting coil is installed between the S-end upper and lower insulating plates, and between the P-end upper and lower insulating plates. An inner layer of high-temperature superconducting coil is installed between the S-end inner fixing plate and the P-end lower end plate.

[0007] Preferably, the outer skeleton is composed of multiple units, including the first mating surface at the S end, the first positioning surface at the S end, the second mating surface at the S end, the second positioning surface at the S end, and the first positioning surface at the P end. The surface between the first mating surface at the S end and the second positioning surface at the S end, which mates with the high-temperature superconducting coil, needs to be sprayed with polytetrafluoroethylene. Similarly, the surface between the second positioning surface at the P end and the upper insulating plate at the P end, which mates with the high-temperature superconducting coil, also needs to be sprayed with polytetrafluoroethylene.

[0008] Preferably, the S-end second positioning surface and the P-end second positioning surface of the outer frame mate with the S-end bearing end plate and the P-end bearing end plate, respectively, and are ultimately welded to the outer frame. The S-end bearing plate and the P-end bearing end plate may be provided depending on the specific magnet type. For magnets with two separate ends, bearing plates are required to adjust the high-temperature superconducting coils. The S-end bearing end plate and the P-end bearing end plate are provided with coil adjustment screw holes.

[0009] Preferably, the S-end bearing plate and the P-end bearing plate are provided with coil adjustment screw holes.

[0010] Preferably, the S-end bearing plate and the P-end bearing plate are tightly matched with the S-end lower insulating plate and the P-end lower insulating plate respectively; the S-end lower insulating plate and the P-end lower insulating plate are provided with bolt positioning holes.

[0011] Preferably, the first positioning surface of the outer skeleton is tightly fitted with the upper end plate of the S end to ensure radial and axial positioning accuracy.

[0012] Preferably, the S-end upper end plate is provided with an S-end positioning groove, an S-end second mating surface and an S-end positioning and fastening screw hole. The S-end positioning groove is used for the coaxial matching of the S-end double-cone structure, and the S-end second mating surface cooperates with the S-end internal fixing plate.

[0013] Preferably, one end of the S-end inner fixing plate is embedded in the S-end upper end plate and is provided with an S-end wedge-shaped welding groove. After the coil size is adjusted, the S-end inner fixing plate is fixed to the inner frame by welding.

[0014] Preferably, the two ends of the inner skeleton are respectively provided with a third matching surface at the S end, a first matching surface at the P end and a measurement reference surface.

[0015] Preferably, the third mating surface at the S end and the first mating surface at the P end respectively match with the inner diameters of the upper end plate at the S end and the lower end plate at the P end.

[0016] Preferably, the P-end lower end plate is provided with a P-end positioning groove, a P-end positioning fastening screw hole and a P-end lower end plate connecting hole.

[0017] Preferably, the P-end positioning groove cooperates with the P-end double-cone structure, the P-end double-cone structure is fixed by the P-end positioning fastening screw hole, and the P-end lower end plate cooperates with the P-end lower end plate positioning step of the P-end force plate.

[0018] Preferably, the outer frame is provided with an operating hand hole, which is convenient for operating the inner magnet and for leading out the wires. In addition, the outer frame should be provided with a heat sink mounting seat for installing the cooling device.

[0019] Preferably, the S-end force-bearing plate and the P-end force-bearing plate are provided with force-bearing grooves, which facilitate the positioning of the clamping device.

[0020] Preferably, welding grooves are provided at the edges where the outer layer skeleton, the P-end stress plate and the S-end stress plate are tightly fitted, for laser welding.

[0021] Preferably, welding grooves are provided at the edges where the upper end plate at the S end, the lower end plate at the P end, the inner frame and the outer frame are joined for laser welding.

[0022] Preferably, the upper insulating plate at the S end and the upper insulating plate at the P end are made of epoxy material. Similarly, the lower insulating plate at the S end and the lower insulating plate at the P end are also made of epoxy material, and bolt positioning holes are provided on the lower insulating plate at the S end and the P end.

[0023] Preferably, polytetrafluoroethylene is sprayed on the curved surface between the third matching surface at the S end and the first matching surface at the P end that matches the high-temperature superconducting coil.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] When high-temperature superconducting magnets require high-precision magnetic flux lines and withstand high impact loads, the skeleton device of the present invention can effectively ensure the positional accuracy requirements of the inner and outer layers of high-temperature superconducting coils in the mechanical structure to achieve the designed magnetic flux line configuration. In addition, the double-cone structure adopted by the present invention can ensure the coaxial accuracy of the high-temperature superconducting magnet installed on the dewar structure. Compared with the traditional pull-rod support structure, the double-cone structure can withstand stronger load impact. The use of laser welding technology on the end plate structure and the skeleton structure can effectively reduce the limitations of the axial size on the magnet design. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present invention, the following will introduce the embodiment of the present invention with reference to the accompanying drawings. On this basis, those skilled in the art can obtain relevant implementation content according to the embodiment.

[0027] Figure 1 It is a front view of the high-temperature superconducting magnet skeleton device with high coaxiality of the present invention;

[0028] Figure 2 A cross-sectional view of a high-temperature superconducting magnet skeleton device with high coaxiality according to the present invention;

[0029] Figure 3 It is a cross-sectional view from another angle of the high-temperature superconducting magnet skeleton device with high coaxiality of the present invention.

[0030] Among them, 1-S end double cone structure, 2-S end force plate, 3-S end upper insulation plate, 4-S end bearing plate, 5-S end lower insulation plate, 6-outer skeleton, 7-heat sink mounting seat, 8-P end bearing plate, 9-P end lower insulation plate, 10-P end force plate, 11-P end upper insulation plate, 12-P end double cone structure, 13-S end upper end plate, 14-S end inner fixing plate, 15-inner skeleton, 16-P end lower end plate, 17-S end first mating surface, 18-S end first positioning surface, 19-S end positioning groove, 20-S end second mating surface, 21-S end wedge welding groove , 22-S end third mating surface, 23-S end positioning and fastening screw hole, 24-S end second positioning surface, 25-P end first mating surface, 26-P end first positioning surface, 27-P end positioning groove, 28-P end positioning and fastening screw hole, 29-P end lower end plate connection hole, 30-operating hand hole, 31-heat sink mounting screw hole, 32-cylindrical fixed table, 33-measuring reference surface, 34-P end lower end plate positioning step, 35-P end second positioning surface, 36-coil adjustment screw hole, 37-bolt positioning hole, 38-force groove, 39-welding groove, 40-P end second mating surface. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the examples of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Based on the examples in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "P end," "S end," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations of the present invention. Furthermore, the terms "first," "second," "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed," "retained," "packaged," "connected," etc. should be understood in a broad sense. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0034] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0035] like Figure 1 、 Figure 2 , Figure 3As shown, a high-coaxiality, high-temperature superconducting magnet skeleton assembly of the present invention comprises an outer skeleton 6 and an inner skeleton 15. The inner skeleton 15 is mounted with an S-end upper end plate 13 and a P-end lower end plate 16 at its upper and lower ends, respectively. An S-end inner retainer plate 14 is mounted below the S-end upper end plate 13. The inner high-temperature superconducting coils are axially dimensioned using the S-end inner retainer plate 14 and the P-end lower end plate 16, and an axial preload is applied to the coils. After the axial dimension of the HTS coils is adjusted, the S-end inner retainer plate 14 is secured to the inner skeleton 15 via laser welding. The P-end lower end plate 16 is tightly fitted onto the inner frame 15 via the P-end first mating surface 25, and is nested within the P-end first positioning surface 26 and the P-end lower end plate positioning step 34, positioning the inner frame 15 and the outer frame 6 in the radial direction for coaxiality. The P-end lower end plate 16 is fixed to the cylindrical fixing platform 32 of the outer frame 6 by screws, and finally the P-end lower end plate 16, the inner frame 15, and the P-end force plate 10 are welded into a whole by laser welding. The surface of the inner frame 15 between the S-end fixing plate 14 and the P-end lower end plate 16 is sprayed with polytetrafluoroethylene. The outer frame 6 is composed of a multi-end unit, including the S-end first mating end surface 17, the S-end first positioning surface 18, the S-end second positioning surface 24, the P-end second positioning surface 35, an operating hand hole 30 for facilitating the operation of the inner magnet coil, and a cylindrical fixing platform 32 fixed to the P-end lower end plate 16. The outer frame 6 is provided with a P-end force plate 10 and an S-end force plate 2 at both ends, respectively. The S-end force plate 2 and the P-end force plate 10 are respectively tightly fitted with the S-end first mating surface 17 and the P-end second mating surface 40 on the outer frame 6. In this embodiment, the outer magnet is divided into upper and lower ends, so the S-end bearing plate 4 and the P-end bearing plate 8 are provided on the inner side of the outer frame 6. The S-end bearing plate 4 and the P-end bearing plate 8 are respectively fitted with the S-end second positioning surface 24 and the P-end second positioning surface 35, and are fixed to the outer frame 6 by welding. The S-end upper insulating plate 3, the P-end upper insulating plate 11, the S-end lower insulating plate 5 and the P-end lower insulating plate 9 are respectively provided on the inner sides of the S-end force plate 2, the P-end force plate 10, the S-end bearing plate 4 and the P-end bearing plate 8, and the outer frame surface between the insulating plates is sprayed with polytetrafluoroethylene.

[0036] The S-end upper end plate 13 and the P-end lower end plate 16 are provided with an S-end positioning groove 19 and a P-end positioning groove 27. The outer diameters of one end of the S-end double-cone structure 1 and the P-end double-cone structure 12 are respectively fixed in the positioning grooves of the two end plates and fixed to the S-end positioning and fastening screw holes 23 and the P-end positioning and fastening screw holes 28 by bolts. The outer diameters of the symmetrical cone structures of the double-cone structures are machined with high coaxiality. The S-end positioning groove 19 and the P-end positioning groove 27 are machined with high coaxiality after the high-temperature magnet is assembled. The fit between the double-cone structure and the positioning groove is set with tolerance fit.

[0037] The S-end stress plate 2 and the P-end stress plate 10 are provided with welding grooves 39 at the joints with the outer frame 6, and stress grooves 38 are provided on the end faces to facilitate the positioning of the coil clamping device, and the axial size adjustment of the outer coil is mainly to apply pre-tightening force to the S-end stress plate and the P-end stress plate.

[0038] The S-end upper insulating plate 3, the P-end upper insulating plate 11, the S-end lower insulating plate 5, and the P-end lower insulating plate 9 are made of epoxy material. Bolt positioning holes 37 are provided on the S-end lower insulating plate 5 and the P-end lower insulating plate 9 for bolt adjustment of the coil.

[0039] The outer frame 6 has a hand hole 30 for accessing the inner magnet and a heat sink mounting base 7. The hand hole 30 facilitates access to the inner magnet's cooling tape and measurement cables. The heat sink mounting base 7 is primarily used for installing a copper heat sink and welding the cooling tape to cool the entire outer frame.

[0040] The S-end upper end plate 13 is provided with an S-end positioning groove 19, an S-end second mating surface 20 and an S-end positioning and fastening screw hole 23. The S-end positioning groove 19 is used for the coaxial matching of the S-end double-cone structure 1, and the S-end second mating surface 20 is matched with the S-end inner fixing plate 14.

[0041] One end of the S-end inner fixing plate 14 is embedded in the S-end upper end plate 13 and is provided with an S-end wedge-shaped welding groove 21. After the coil size is adjusted, the S-end inner fixing plate 14 is fixed to the inner frame 15 by welding.

[0042] The inner frame 15 is provided with an S-end third mating surface 22, a P-end first mating surface 25 and a measurement reference surface 33 at both ends. The S-end third mating surface 22 and the P-end first mating surface 25 respectively mate with the inner diameters of the S-end upper end plate 13 and the P-end lower end plate 16.

[0043] The S-end bearing plate 4 and the P-end bearing plate 8 are provided with coil adjustment screw holes 36 .

[0044] The cylindrical fixing platform 32 is provided with screw holes to be fixedly connected to the P-end lower end plate 16 .

[0045] The working principle of the present invention is as follows:

[0046] In this embodiment of the present invention, a high-coaxiality high-temperature superconducting magnet skeleton device is described. During use, one end of the S-end double-cone structure 1 and the P-end double-cone structure 12 are fixed to the vacuum dewar, and one end is fixed to the S-end positioning groove 19 of the S-end upper end plate 13 and the P-end positioning groove 27 of the P-end lower end plate 16 of the high-temperature magnet. The double-cone structures are fixed to the magnet end plates via S-end positioning and fastening screw holes 23 and P-end positioning and fastening screw holes 28. The positioning outer circles on both sides of the double-cone structures ensure high coaxiality between the high-temperature magnet and the vacuum dewar. The high-temperature coil of the outer magnet is mounted on the outer skeleton 6. Axial preload and dimensional adjustment are applied to the high-temperature superconducting coil via the S-end force plate 2, the S-end bearing plate 4, the P-end force plate 10, and the P-end bearing plate 8. After the coil dimensional adjustment is satisfactory, the force plate and the outer skeleton 6 are laser welded together to form a single unit. The inner magnets are first fixed to the inner frame 15 via the P-end first mating surface 25, with the P-end lower end plate 16 then being used to adjust the axial dimensions of the inner coil and apply axial preload. After adjusting the axial dimensions of the inner coil, the S-end inner fixed plate 14 is laser welded to the inner frame 15, leaving an S-end wedge-shaped welding groove 21 at the upper end of the S-end inner fixed plate 14. The assembled inner magnets are then nested into the outer frame 6, with the P-end lower end plate 16 secured in axial position via the P-end first positioning surface 26 and nested within the P-end lower end plate positioning step 34. The P-end lower end plate 16 is then secured to the cylindrical fixing platform 32 via the P-end lower end plate connection hole 29. The S-end upper end plate 13 is then pressed between the inner and outer skeletons. The coaxiality between the inner skeleton 15 and the outer skeleton 6 is determined by the fit between the outer diameter of the S-end upper end plate 13 and the first positioning surface 18 of the S-end, and the radial fit between the outer diameter of the P-end lower end plate 16 and the P-end force plate 10. After the inner and outer magnets are assembled, the S-end positioning groove 19 on the S-end upper end plate 13 and the P-end positioning groove 27 on the P-end lower end plate 16 are subjected to high coaxial machining. Then, the outer diameter of the double-cone structure is fine-machined to the machined dimensions to ensure the overall coaxiality of the magnet and the double-cone structure. A finely machined measurement reference surface is left on the inner side of the inner skeleton 15 as the reference for the final coaxiality measurement.

[0047] The above shows and describes 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 to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention claimed. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature superconducting magnet skeleton device with high coaxiality, characterized in that: The invention comprises an outer frame (6) and an inner frame (15), wherein an S-end upper end plate (13) and a P-end lower end plate (16) are respectively provided at the upper and lower ends of the inner frame (15), an S-end inner fixed plate (14) is provided on the lower side of the S-end upper end plate (13), and the inner frame (15) and the S-end inner fixed plate (14) are nested inside the outer frame (6), an S-end force plate (2) and a P-end force plate (10) are provided at both ends of the outer frame (6), an S-end upper insulating plate (3) and a P-end upper insulating plate (11) are respectively provided on the inner sides of the S-end force plate (2) and the P-end force plate (10), and an S-end bearing plate ( 4) and a P-end bearing plate (8), an S-end lower insulating plate (5) and a P-end lower insulating plate are respectively provided on the upper sides of the S-end bearing plate (4) and the P-end bearing plate (8), and an operating hand hole (30) and a heat sink mounting seat (7) are respectively provided on the cylinder surface of the outer frame (6); a high-temperature superconducting coil is installed between the S-end upper insulating plate (3) and the S-end lower insulating plate (5), and between the P-end upper insulating plate (11) and the P-end lower insulating plate (9), an inner layer of high-temperature superconducting coil is installed between the S-end inner fixing plate (14) and the P-end lower end plate, and an S-end double-cone structure (1) and a P-end double-cone structure (12) are respectively provided on both sides of the S-end upper end plate (13) and the P-end lower end plate; The outer layer skeleton (6) is composed of a multi-end unit, including a first mating surface (17) at the S end, a first positioning surface (18) at the S end, a second positioning surface (24) at the S end, a second positioning surface (35) at the P end, an operating hand hole (30) for facilitating operation of the inner magnet coil, and a cylindrical fixing platform (32) fixed to the lower end plate (16) at the P end.

2. The high-temperature superconducting magnet skeleton device with high coaxiality according to claim 1, characterized in that: The first matching surface (17) at the S end is tightly matched with the inner diameter surface of the force-bearing plate (2) at the S end, and the upper insulating plate (3) at the S end is sleeved on the first matching surface (17) at the S end.

3. The high-coaxiality high-temperature superconducting magnet skeleton device according to claim 1, characterized in that: The second positioning surface (24) at the S end and the second positioning surface (35) at the P end cooperate with the S end bearing plate (4) and the P end bearing plate (8), respectively. The S end bearing plate (4) and the P end bearing plate (8) are fixed to the outer frame (6) by welding.

4. The high-coaxiality high-temperature superconducting magnet skeleton device according to claim 3, characterized in that: The S-end bearing plate (4) and the P-end bearing plate (8) are provided with coil adjustment screw holes (36).

5. The high-coaxiality high-temperature superconducting magnet skeleton device according to claim 3, characterized in that: The S-end bearing plate (4) and the P-end bearing plate (8) are tightly matched with the S-end lower insulating plate (5) and the P-end lower insulating plate (9), respectively; the S-end lower insulating plate (5) and the P-end lower insulating plate (9) are provided with bolt positioning holes (37).

6. The high-coaxiality high-temperature superconducting magnet skeleton device according to claim 1, characterized in that: The first positioning surface (18) at the S end of the outer layer skeleton (6) is tightly fitted with the upper end plate (13) at the S end to ensure radial and axial position accuracy.

7. The high-temperature superconducting magnet skeleton device with high coaxiality according to claim 6, characterized in that: The S-end upper end plate (13) is provided with an S-end positioning groove (19), an S-end second matching surface (20) and an S-end positioning fastening screw hole (23); the S-end positioning groove (19) is used for coaxial matching of the S-end double-cone structure (1); and the S-end second matching surface (20) matches the S-end inner fixing plate (14).

8. The high-temperature superconducting magnet skeleton device with high coaxiality according to claim 7, characterized in that: One end of the S-end inner fixing plate (14) is embedded in the S-end upper end plate (13) and is provided with an S-end wedge-shaped welding groove (21). After the coil size is adjusted, the S-end inner fixing plate (14) is fixed to the inner frame (15) by welding.

9. The high-temperature superconducting magnet skeleton device with high coaxiality according to claim 8, characterized in that: The two ends of the inner skeleton (15) are respectively provided with an S-end third mating surface (22), a P-end first mating surface (25), and a measurement reference surface (33).

10. The high-temperature superconducting magnet skeleton device with high coaxiality according to claim 9, characterized in that: The third matching surface (22) at the S end and the first matching surface (25) at the P end respectively match the inner diameters of the upper end plate (13) at the S end and the lower end plate (16) at the P end.

11. The high-temperature superconducting magnet skeleton device with high coaxiality according to claim 10, characterized in that: The P-end lower end plate (16) is provided with a P-end positioning groove (27), a P-end positioning fastening screw hole (28), and a P-end lower end plate connecting hole (29).

12. The high-temperature superconducting magnet skeleton device with high coaxiality according to claim 11, characterized in that: The P-end positioning groove (27) cooperates with the P-end double-cone structure (12), and the P-end double-cone structure (12) is fixed through the P-end positioning fastening screw hole (28), and the P-end lower end plate (16) cooperates with the P-end lower end plate positioning step (34) of the P-end force plate (10).

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