Multi-coil integrated inner skeleton and conduction-cooled superconducting magnet assembly

Abstract

The present application relates to a multi-coil integrated inner frame and a conduction-cooled superconducting magnet assembly, the inner frame has a cylindrical cavity on the inner side, a plurality of flange plates are arranged on the outer side, and a plurality of winding grooves for coil conductors are spaced apart; a coil lead-out groove is arranged on the vertical surface of the flange plate; a mounting groove for a quench trigger heater assembly is arranged on the flange plate; a plurality of mounting support structure fixing through holes are arranged on the flange plates at both ends; a plurality of mounting screw holes are arranged on the flange plate; and a plurality of mounting planes are arranged on the outer surface of the multi-coil integrated inner frame. The conduction-cooled superconducting magnet assembly is formed by winding a wire in each winding groove of the above multi-coil integrated inner frame to form a superconducting coil; a quench trigger heater assembly is tightly mounted on the outer surface of the outer layer insulation of the coil; a structure reinforcing layer is wound in the "U" shaped groove of the quench heater; and a support plate is mounted on the outer surface of the inner frame. The present application has a simple overall structure, is easy to manufacture and assemble, and has high reliability of the finished product.

Description

Technical Field

[0001] The present invention relates to a frame used in a conduction-cooled superconducting magnet, in particular to an integral frame for a multi-coil magnet structure, and a superconducting magnet assembly formed thereby, belonging to the technical field of superconducting magnets. Background Art

[0002] Superconducting magnet technology uses superconductors to make coils at ultra-low temperatures (liquid helium temperature, 4K, -269.15℃) with no wire resistance and therefore no electrical loss. It can allow ultra-high currents to pass through, thereby generating ultra-high magnetic fields, and uses ultra-high magnetic fields for some applications.

[0003] In superconducting magnet technology, there is a type of multi-coil technology that uses a common framework to wind superconducting coils, commonly used in magnetic resonance imaging. Furthermore, to break away from reliance on liquid helium refrigerants, small MRI superconducting magnets have recently transitioned from liquid helium immersion cooling to conduction cooling, a technology that is becoming increasingly mature.

[0004] At present, in the field of single-solenoid coils, the overall exoskeleton can be conveniently used to simplify the cooling mass structure; however, if the overall exoskeleton is used for multi-solenoid coils, the cooling mass structure will become more complicated, which is not conducive to reducing the weight of the cooling mass and improving the cooling efficiency.

[0005] Multi-solenoid coil technology often utilizes an integral internal skeleton structure. To achieve the most uniform temperature distribution possible, the skeleton must be constructed of high-thermal-conductivity metal materials, commonly copper, brass, aluminum, and aluminum alloys. On the one hand, the shrinkage of these materials is greater than that of the superconducting coil itself, making uniform compression of the coil skeleton and avoiding increased magnetic field inhomogeneity due to superconducting coil deformation a major design challenge. On the other hand, in addition to the robustness of the cold mass suspension support structure required for transportation and installation, the high stability of the magnetic field further necessitates a high preload to increase the overall stiffness of the suspension support structure. This, however, presents a conflict with the "soft" mechanical properties of the skeleton material.

[0006] Therefore, there is currently no suitable multi-coil integral inner skeleton engineering application solution, and further research and design are necessary. Summary of the Invention

[0007] The purpose of the present invention is to provide a multi-coil integral inner skeleton and conduction-cooled superconducting magnet assembly, which is integrally forged and processed from high thermal conductivity metal materials, and can meet the needs of multi-coil winding; at the same time, it improves the fixing structure to meet the strength requirements of suspension support and improves the mechanical reliability of transportation and use.

[0008] To achieve the above-mentioned object of the invention, the first aspect of the present invention provides a multi-coil integral inner frame made of a metal material with high thermal conductivity;

[0009] The inner side is a cylindrical cavity, and the outer side is provided with a number of flange plates, which separate the winding slots of the coil conductors;

[0010] Flange plate, including end flanges on both sides and a number of spacer flanges;

[0011] A coil lead-out groove is provided on the vertical surface of the flange plate, and the coil lead-out groove extends from the bottom of the winding groove to the top of the groove;

[0012] The flange plate is provided with a mounting groove for the quench-triggered heater assembly, and the heater mounting groove and the coil lead lead groove are located at different angles of the flange plate;

[0013] The heater installation groove forms an embedded groove in the vertical surface of the flange plate; the heater installation groove forms a recess on the outer surface of the flange plate;

[0014] The flange plates at both ends are provided with a plurality of fixing holes for mounting the supporting structure; the fixing holes penetrate the radial direction of the flange plates and extend from the outer surface to the wall surface of the inner cylinder; the fixing holes are provided with countersunk holes on the wall surface of the inner cylinder;

[0015] The flange plate is provided with a number of mounting screw holes;

[0016] The outer surface of the multi-coil integral inner frame is provided with a plurality of mounting planes;

[0017] The mounting plane includes four evenly distributed support structure mounting planes; the flange plates within the support structure mounting planes are provided with fixing through holes and mounting screw holes; each flange plate is provided with a fixing through hole or a mounting screw hole;

[0018] Four other component installation areas are formed between the four support structure installation planes;

[0019] The installation plane is also provided with a wiring board installation plane and a quench protection diode assembly installation plane, which are arranged relatively in the area where other components are arranged;

[0020] Each flange plate within the terminal board mounting plane is provided with mounting screw holes; each flange plate within the quench protection diode assembly mounting plane is provided with mounting screw holes;

[0021] The heater installation slots are provided in the other two other component installation areas;

[0022] An insulating layer is provided on the outer surface of the multi-coil integral inner frame.

[0023] As a further improvement of the present invention, at least one coil lead-out groove is provided in the vertical surface of the flange plates on both sides of each winding groove.

[0024] As a further improvement of the present invention, at least one heater installation groove is provided in each of the other two component installation areas.

[0025] Furthermore, two heater installation slots are provided in the other two other component installation areas, one for installing the quench triggered heater assembly and the other as a spare installation slot.

[0026] As a further improvement of the present invention, the fixing through hole is located on the end flange and the first spacing flange adjacent to the end flange;

[0027] The fixing through holes are arranged in groups of four at both ends of the four support structure mounting planes, with a total of eight groups.

[0028] As a further improvement of the present invention, the insulating layer is an insulating varnish sprayed on the metal outer surface of the multi-coil integral inner skeleton;

[0029] The thickness of the insulating varnish layer is 50 to 100 μm.

[0030] Furthermore, the installation plane area on the multi-coil integral inner frame is not sprayed with insulating paint.

[0031] In a second aspect, the present invention provides a conduction-cooled superconducting magnet assembly, wherein superconducting coils are formed by winding wires in the winding slots of the multi-coil integral inner frame.

[0032] The outer surface of the superconducting coil is close to the bottom surface of the embedding groove;

[0033] Arranging a coil outer layer insulation on the outer surface of the superconducting coil;

[0034] Install a quench trigger heater assembly close to the outer surface of the outer insulation layer of the coil;

[0035] The quench heater assembly includes a quench heater, which is a "U"-shaped stainless steel sheet as a whole;

[0036] The bottom plate of the quench heater is arc-shaped and is in close contact with the outer surface of the cylindrical insulation of the outer layer of the coil;

[0037] The vertical plates on both sides of the quench heater are embedded in the heater installation groove, close to the vertical surface of the embedded groove;

[0038] The upper parts of the vertical plates on both sides of the quench heater protrude into the clearance groove;

[0039] The upper inner sides of the vertical plates on both sides of the quench heater are provided with wiring copper bars;

[0040] Connection holes for electrical connection are provided on the vertical plate and the wiring copper busbar;

[0041] A plurality of insulators are also provided on the outside of the quench heater;

[0042] Winding a structural reinforcement layer in the "U"-shaped groove of the quench heater;

[0043] Install a support plate on the outer surface of the multi-coil integral inner frame;

[0044] Install the cold end support base on the four support structure installation planes respectively;

[0045] The main body of the cold end support seat is a flat plate, and the main plate of the cold end support seat is made of a hard alloy of the same metal as the main metal of the coil integral inner frame;

[0046] Both ends of each cold end support base main body plate are respectively provided with suspension support mounting parts, and fixed mounting holes are respectively provided along the four sides of the suspension support mounting parts, and the fixed mounting holes correspond to the fixed through holes;

[0047] The stainless steel screws pass through the fixing holes and the fixing through holes at the same time to fix the two ends of the cold end support seat to the multi-coil integral inner frame. The nut heads of the stainless steel screws or the matching stainless steel nuts are located in the countersunk holes of the fixing through holes and do not protrude into the inner cylindrical area of ​​the multi-coil integral inner frame.

[0048] Each of the cold end support base main body flat plates is provided with a plurality of connection and mounting holes corresponding to the mounting screw holes;

[0049] The cold end support base main plate is connected to each flange plate through fasteners;

[0050] Install the terminal block on the terminal block mounting surface;

[0051] The terminal block is made of metal, and its main metal composition is the same as the metal composition of the multi-coil integral inner frame;

[0052] The terminal block is used to connect the lead-out terminals or taps of the superconducting coil;

[0053] The terminal board is provided with a mounting portion for mounting a high thermal conductivity connector, which is ultimately connected to the cold head of the refrigerator;

[0054] Install the lower support plate on the mounting plane of the quench protection diode assembly;

[0055] The lower support plate is made of metal, and its main metal composition is the same as the metal composition of the multi-coil integral inner frame;

[0056] The lower support plate is used to fix the quench protection diode assembly;

[0057] The wiring board and the lower support plate are provided with mounting holes, which are connected to the mounting screw holes on each flange plate through fasteners.

[0058] As a further improvement of the present invention, the suspension support mounting member is a lifting ear, and a lifting hole is provided in the lifting ear;

[0059] A suspension rod is passed through the suspension hole; two suspension rods are arranged opposite to each other along the installation plane direction of each supporting structure outside the multi-coil integral inner frame; a total of eight suspension rods, four groups of opposite suspension rods, are provided.

[0060] As a further improvement of the present invention, a high thermal conductivity soft metal foil is provided between the cold end support seat, the terminal block, the lower support plate and the mounting plane of the outer surface of each flange plate of the multi-coil integral inner skeleton.

[0061] The multi-coil integral inner frame and conduction-cooled superconducting magnet assembly of the present invention has the following advantages:

[0062] 1. The structure of the inner frame is convenient for winding multiple coils and installing and fixing the leads of each coil;

[0063] 2. The inner frame and the cold end support seat, terminal block, and lower support plate installed on it have the same main metal composition, so the cold shrinkage is similar, and the cold shrinkage is greater than that of the superconducting coil. After the support plates are assembled with the overall frame, they provide uniform axial compression force for each superconducting coil at the operating temperature (4K, -269.15℃);

[0064] 3. The multi-coil integral inner frame and superconducting magnet assembly have high thermal conductivity, solid and reliable structure, and uniform temperature distribution, which is conducive to improving the critical current of the superconducting conductor and thus increasing the stability margin of the superconducting magnet;

[0065] 4. A stainless steel to stainless steel threaded connection method is used around the cold end bearing point of the suspension support. This can withstand a greater suspension support pre-tightening force than the stainless steel to high thermal conductivity metal thread connection method, and can provide a more stable and uniform magnetic field for the magnetic resonance imaging device.

[0066] The present invention has a simple overall structure, is easy to manufacture and assemble, and can meet the requirements of efficient production and manufacturing of conduction-cooled superconducting magnet components for magnetic resonance imaging devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 This is a schematic diagram of the overall structure of the multi-coil integral inner skeleton of the present invention;

[0068] Figure 2 This is a front view of the overall structure of the multi-coil integral inner skeleton of the present invention;

[0069] Figure 3This is an overall cross-sectional view of the multi-coil integral inner skeleton of the present invention;

[0070] Figure 4 It is a structural schematic diagram of the quench triggered heater of the present invention;

[0071] Figure 5 A half-section diagram of the superconducting coil winding at the location of the quench trigger heater of the present invention;

[0072] Figure 6 Schematic diagram of the overall structure of the conduction-cooled superconducting magnet assembly of the present invention;

[0073] Figure 7 Schematic diagram of the end portion of the conduction-cooled superconducting magnet assembly of the present invention. DETAILED DESCRIPTION

[0074] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0075] The present invention mainly improves the multi-solenoid coil conduction cooling superconducting magnet assembly. First, the structure of the multi-coil overall inner frame is improved. The structure is as follows: Figure 1 、 Figure 2 、 Figure 3 As shown, the multi-coil integral inner skeleton 1 is integrally forged and processed from high thermal conductivity metal materials. The high thermal conductivity metal materials include T2 copper, T3 copper, H65~H80 brass, or aluminum-magnesium alloy, etc., which have high thermal conductivity but low hardness.

[0076] The multi-coil integral inner skeleton 1 serves as a winding skeleton for the superconducting coil conductor. The inner wall is a cylindrical cavity used as a magnetic field channel. A number of flange plates are provided on the outside to separate the winding grooves 10 for the coil conductor. The flange plates are symmetrically distributed from the outside to the inside, and include an end flange 11, a first spacing flange 12, a second spacing flange 13, and a third spacing flange 14. Among them, the first spacing flange 12, the second spacing flange 13, and the third spacing flange 14 serve as spacing flanges, and the number of the first spacing flange 12, the second spacing flange 13, and the third spacing flange 14 can be adjusted according to specific circumstances, and the flange thickness can also be adjusted according to requirements. In the embodiment of the multi-coil integral inner skeleton 1 of the present invention, the cavity between the end flanges 11 on both sides is divided into 6 winding grooves 10 by the spacing flanges.

[0077] Coil lead lead grooves 15 are provided on the flange plate (end flange 11, spacer flange), i.e., on both side walls of the winding groove 10. Preferably, the coil lead lead grooves 15 extend from the bottom of the winding groove 10 to the top of the groove. When the conductor of the superconducting coil is wound in the winding groove 10, the wire ends and taps are embedded in the coil lead lead grooves 15 and led out from the winding groove 10. The conventional method at present is to glue an insulating plate of extra thickness to the flange plate, and then cut grooves in the insulating plate to lead out the wire ends. The present invention directly opens the coil lead lead grooves 15 on the metal body of the flange plate, which can fully ensure that the surface of the inner skeleton formed by fine processing, i.e., the winding groove 10, which serves as the basis for winding the coil, has higher dimensional accuracy, thereby obtaining a superconducting coil with higher dimensional accuracy, thereby ensuring that the magnetic field non-uniformity is as close to the calculated value as possible.

[0078] The flange plate (end flange 11 and spacer flange), i.e., the side walls and end faces of the winding groove 10, also feature mounting recesses for the quench-trigger heater assembly, namely, heater mounting recesses 16. These recesses are located at different angles from the coil lead-out recess 15, allowing the lead-out point of the wire to be offset from the installation location of the quench-trigger heater assembly. In this embodiment of the present invention, two sets of heater mounting recesses 16 are provided along the entire perimeter of the flange plate, each set containing two heater mounting recesses 16, for mounting the quench-trigger heater assembly and serving as backup mounting recesses. These recesses 16 form recesses 161 within the flange plate's vertical surface, while recesses 162 are formed on the flange plate's outer surface.

[0079] A fixing through hole 17 for mounting the supporting structure is provided on the end flange 11, and preferably one of the spacer flanges (shown in the figure as the first spacer flange 12 adjacent to the end flange 11); the fixing through hole 17 passes through the radial direction of the flange plate, extending from the outer surface to the inner tube wall of the multi-coil integral inner skeleton 1; in particular, the fixing through hole 17 is provided with a countersunk hole 171 on the inner tube wall of the multi-coil integral inner skeleton 1.

[0080] The spacing flange of the multi-coil integral endoskeleton 1 also features mounting screw holes 18 for attaching components such as the terminal block and lower support plate to the endoskeleton. Unlike the through-holes 17 at each end, which penetrate both ends, these mounting screw holes 18 are blind holes located only on the outer surface of the spacing flange and do not penetrate the inner wall of the multi-coil integral endoskeleton 1.

[0081] The outer surface of the multi-coil integral inner frame 1 is machined to form several mounting surfaces 19. Specifically, four evenly spaced mounting surfaces are provided as support structure mounting surfaces 191 for mounting support structure components. Furthermore, depending on design requirements, a terminal block mounting surface 192 may be provided for mounting a terminal block for connecting the coil wire ends and taps, and a quench protection diode assembly mounting surface 193 may be provided for mounting a quench protection diode assembly for connecting the quench-triggered heater assembly. Specifically, eight areas are evenly spaced along the outer surface of the multi-coil integral inner frame 1. Four evenly spaced areas are provided as symmetrical support structure mounting surfaces 191. Of the remaining four evenly spaced areas, two opposing areas are provided for accommodating heater mounting slots 16, and the remaining two opposing areas are provided for accommodating terminal block mounting surfaces 192 and quench protection diode assembly mounting surfaces 193, respectively.

[0082] The multi-coil integral inner frame 1 of the present invention preferably also includes an insulating layer on its outer surface, preferably sprayed with insulating varnish with a thickness of 50 to 100 μm, to provide basic ground insulation for the superconducting coils and protective circuitry. The insulating layer should be positioned away from the mounting plane 19 to prevent degradation of thermal conductivity at the interface between the terminal block or support plate and the inner frame.

[0083] The multi-coil integral inner frame 1 of the present invention is integrally forged, then machined into a specific structure, and finally sprayed with insulating paint to be used as a finished product.

[0084] When the multi-coil integral inner frame 1 of the present invention is used, it is first set up on a winding machine, and according to the settings, a wire is wound in each winding slot 10 to form a superconducting coil 2. Figure 5 As shown; the outer surface of the wound superconducting coil 2 is substantially flush with the bottom of the embedding groove 161, and then the outer surface of the superconducting coil 2 is provided with a coil outer layer insulation 21. Then, a quench trigger heater assembly is installed against the outer surface of the coil outer layer insulation 21, and the quench heater assembly includes a quench heater 3 as shown Figure 4As shown, the entire structure is made of a U-shaped stainless steel sheet with a thickness of 0.3 mm to 0.6 mm. When energized, it can generate heat to heat the superconducting coil and accelerate the quenching of the coil. The bottom plate 31 of the quench heater 3 is arc-shaped and fits the cylindrical outer surface of the coil outer insulation 21. The vertical plates 32 on both sides of the quench heater 3 are embedded in the heater mounting groove 16, close to the vertical surface of the embedding groove 161. The upper parts of the vertical plates 32 on both sides of the quench heater 3 protrude into the said recess 162. The upper inner sides of the vertical plates 32 on both sides of the quench heater 3 are provided with a wiring copper busbar 33, which is preferably fixed to the inner side of the vertical plate 32 by brazing. The vertical plates 32 and the wiring copper busbar 33 are provided with connection holes 34 for electrical connection. The connection holes 34 are located in the recess 162, thereby reducing the overall external dimensions. A plurality of insulators 35 are also provided on the outer side of the quench heater 3 for insulating the quench heater 3 from the ground. After the quench trigger heater assembly is in place, the structural reinforcement layer 4 is wound in the "U"-shaped groove of the quench heater 3. At this point, the winding process is completed, the assembly can be removed, and the external structure can be installed to further form the superconducting magnet assembly.

[0085] like Figure 6 、 Figure 7 As shown, relevant support plates are installed on the installation plane 19. The relevant support plates include four cold end support bases 5, one wiring board 6, and one lower support plate 7:

[0086] (1) Install the cold end support seat 5 on the four support structure installation planes 191.

[0087] The main body of the cold end support base 5 is a flat plate. The material used for the main plate of the cold end support base 5 is the same as the primary metal used for the coil integral inner frame 1, but it uses a hard alloy of the corresponding metal. That is, when the coil integral inner frame 1 is made of copper or brass, the main plate of the cold end support base 5 is made of hard brass. When the coil integral inner frame 1 is made of aluminum-magnesium alloy, the main plate of the cold end support base 5 is made of hard aluminum alloy. The use of hard alloy for the main plate of the cold end support base 5 provides greater structural strength; however, at the same time, the same primary metal as the coil integral inner frame 1 ensures that the cold shrinkage of the two is as consistent as possible.

[0088] Both ends of the main plate of the cold end support seat 5 are respectively provided with lifting ears 51, and a lifting hole 52 is provided in the lifting ear 51; by inserting a lifting rod into the lifting hole 52 of the lifting ear 51, a total of 8 lifting rods are arranged along the axis in four directions of the circumference of the multi-coil integral inner skeleton 1, so as to suspend, support and fix the multi-coil integral inner skeleton 1 and its superconducting coils and other components thereon.

[0089] The cold end support base 5 is provided with a plurality of fixing holes 53 on its plate, corresponding to the fixing through-holes 17. Specifically, four fixing holes 53 are provided at each end of the cold end support base 5, surrounding the lifting lugs 51 and providing sufficient structural support. During installation, a stainless steel screw is inserted from the inside into the fixing through-holes 17, the screw head sinking into the countersunk hole 171, and the screw shaft extending through the fixing holes 53. The screw is then secured with a gasket and nut. Alternatively, a stainless steel screw can be inserted from the cold end support base 5 into the multi-coil integral inner frame 1, and the nut installed in the countersunk hole 171. However, in this case, the length of the stainless steel screw must be carefully calculated, and the depth of the countersunk hole 171 must be appropriately deepened to ensure that both the screw head and the nut are fully within the countersunk hole 171 and do not protrude from the inner cylindrical area of ​​the multi-coil integral inner frame 1. The threaded connection of the stainless steel screw and stainless steel nut provides significantly greater structural strength than that achieved with high thermal conductivity materials such as copper and aluminum, thereby enhancing the suspension support and fixing strength of the entire superconducting magnet assembly.

[0090] The cold-end support base 5 is provided with a plurality of connecting mounting holes 54, which correspond to mounting screw holes 18 on the exterior of the multi-coil integral endoskeleton 1. These holes are connected by screws, thereby increasing the contact surface between the cold-end support base 5 and the exterior surface of the multi-coil integral endoskeleton 1 and improving the efficiency of cooling transfer. Specifically, each flange plate is provided with fixing holes 17 or mounting screw holes 18, which connect to the cold-end support base 5. While providing structural strength, the cold-end support base 5 also conducts heat and cooling from the exterior of the multi-coil integral endoskeleton 1, enhancing heat and cooling transfer between the flange plates.

[0091] Furthermore, a high thermal conductivity soft metal foil, such as pure indium, high indium alloy, etc., is provided between the cold end support base 5 and the multi-coil integral inner skeleton 1 to enhance heat conduction / cold conduction.

[0092] (2) Install the terminal block 6 on the terminal block installation plane 192.

[0093] The terminal block 6 is preferably made of pure aluminum or pure copper, and the main metal composition is the same as the metal composition of the multi-coil integral inner skeleton 1; the terminal block 6 is also provided with insulating terminals, etc., for connecting the lead-out wire ends or taps of the superconducting coils.

[0094] At the same time, the terminal board 6 is also provided with a mounting portion for installing a high thermal conductivity connector, which is ultimately connected to the cold head of the refrigerator, that is, it is used as a low thermal resistance heat conduction channel between the cold mass and the cold head of the refrigerator; therefore, the terminal board 6 is provided with a mounting hole, which is connected to each flange plate to achieve cooling.

[0095] The high thermal conductivity soft metal foil is also provided between the terminal block 6 and the multi-coil integral inner frame 1 .

[0096] (3) Install the lower support plate 7 on the quench protection diode assembly mounting plane 193.

[0097] The lower support plate is made of pure aluminum or pure copper, and the main metal composition is the same as the metal composition of the multi-coil integral inner skeleton 1; the lower support plate is used to fix the quench protection diode assembly; at the same time, the lower support plate is connected to each flange plate to further enhance the heat conduction between the flanges.

[0098] The high thermal conductivity soft metal foil is also provided between the lower support plate 7 and the multi-coil integral inner frame 1.

[0099] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without departing from the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. Multi-coil integral inner skeleton, characterized by: Made of high thermal conductivity metal material; The inner side is a cylindrical cavity, and the outer side is provided with a number of flange plates, which separate the winding slots of the coil conductors; Flange plate, including end flanges on both sides and a number of spacer flanges; A coil lead-out groove is provided on the vertical surface of the flange plate, and the coil lead-out groove extends from the bottom of the winding groove to the top of the groove; The flange plate is provided with a mounting groove for the quench-triggered heater assembly, and the heater mounting groove and the coil lead lead groove are located at different angles of the flange plate; The heater installation groove forms an embedded groove in the vertical surface of the flange plate; the heater installation groove forms a recess on the outer surface of the flange plate; A plurality of fixing through holes for mounting the support structure are provided on the end flanges on both sides; the fixing through holes penetrate the radial direction of the flange plate and extend from the outer surface to the wall surface of the inner cylinder; the fixing through holes are provided with countersunk holes on the wall surface of the inner cylinder; The outer surface of the multi-coil integral inner frame is provided with a plurality of mounting planes; The mounting plane includes four evenly distributed support structure mounting planes; the flange plates within the support structure mounting planes are provided with fixing through holes and mounting screw holes; each flange plate is provided with a fixing through hole or a mounting screw hole; Four other component installation areas are formed between the four support structure installation planes; The installation plane is also provided with a wiring board installation plane and a quench protection diode assembly installation plane, which are relatively arranged in two other component installation areas; Each flange plate within the terminal board mounting plane is provided with mounting screw holes; each flange plate within the quench protection diode assembly mounting plane is provided with mounting screw holes; The heater installation slots are provided in the other two other component installation areas; The outer surface of the multi-coil integral inner frame is provided with an insulating layer; Install the cold end support base on the four support structure installation planes respectively; The main body of the cold end support seat is a flat plate, and the main plate of the cold end support seat is made of a hard alloy of the same metal as the main metal of the multi-coil integral inner frame; Both ends of each cold end support base main body plate are respectively provided with suspension support mounting parts, and fixed mounting holes are respectively provided along the four sides of the suspension support mounting parts, and the fixed mounting holes correspond to the fixed through holes; The stainless steel screws pass through the fixing holes and the fixing through holes at the same time to fix the two ends of the cold end support seat to the multi-coil integral inner frame. The nut heads of the stainless steel screws or the matching stainless steel nuts are located in the countersunk holes of the fixing through holes and do not protrude into the inner cylindrical area of ​​the multi-coil integral inner frame. Each of the cold end support base main body flat plates is provided with a plurality of connection and mounting holes corresponding to the mounting screw holes; The cold end support seat main body flat plate is connected to each flange plate through fasteners.

2. The multi-coil integral inner skeleton according to claim 1, characterized in that: At least one coil lead-out groove is provided in the vertical surface of the flange plate on both sides of each winding groove.

3. The multi-coil integral inner skeleton according to claim 1, characterized in that: In addition, there are more than one heater installation slot in the two other component installation areas.

4. The multi-coil integral inner skeleton according to claim 3, characterized in that: The other two other component installation areas are each provided with two heater installation slots, one for installing the quench triggered heater assembly and the other as a spare installation slot.

5. The multi-coil integral inner skeleton according to claim 1, characterized in that: The fixing through holes are located on the end flange and the first spacing flange adjacent to the end flange; The fixing through holes are arranged in groups of four at both ends of the four support structure mounting planes, with a total of eight groups.

6. The multi-coil integral inner skeleton according to claim 1, characterized in that: The insulating layer is an insulating varnish sprayed on the metal outer surface of the multi-coil integral inner frame; The thickness of the insulating varnish layer is 50~100μm.

7. The multi-coil integral inner skeleton according to claim 6, characterized in that: The installation plane area on the multi-coil integral inner frame is not sprayed with insulating paint.

8. A conduction-cooled superconducting magnet assembly, characterized in that: The multi-coil integral inner frame comprises the multi-coil integral inner frame according to any one of claims 1 to 7, wherein each winding groove of the multi-coil integral inner frame is wound with a wire to form a superconducting coil; The outer surface of the superconducting coil is close to the bottom surface of the embedding groove; Arranging a coil outer layer insulation on the outer surface of the superconducting coil; Install a quench trigger heater assembly close to the outer surface of the outer insulation layer of the coil; The quench trigger heater assembly includes a quench heater, which is a "U"-shaped stainless steel sheet as a whole; The bottom plate of the quench heater is arc-shaped and is in close contact with the outer surface of the cylindrical insulation of the outer layer of the coil; The vertical plates on both sides of the quench heater are embedded in the heater installation groove, close to the vertical surface of the embedded groove; The upper parts of the vertical plates on both sides of the quench heater protrude into the clearance groove; The upper inner sides of the vertical plates on both sides of the quench heater are provided with wiring copper bars; Connection holes for electrical connection are provided on the vertical plate and the copper busbar; A plurality of insulators are also provided on the outside of the quench heater; Wrap the structural reinforcement layer in the "U"-shaped groove of the quench heater; Installing a support plate on the outer surface of the multi-coil integral inner frame; Install the terminal block on the terminal block mounting surface; The terminal block is made of metal, and its main metal composition is the same as the metal composition of the multi-coil integral inner frame; The terminal block is used to connect the lead-out terminal or tap of the superconducting coil; The terminal board is provided with a mounting portion for mounting a high thermal conductivity connector, which is ultimately connected to the cold head of the refrigerator; Install the lower support plate on the mounting plane of the quench protection diode assembly; The lower support plate is made of metal, and its main metal composition is the same as the metal composition of the multi-coil integral inner frame; The lower support plate is used to fix the quench protection diode assembly; The wiring board and the lower support plate are provided with mounting holes, which are connected to the mounting screw holes on each flange plate through fasteners.

9. The conduction-cooled superconducting magnet assembly according to claim 8, wherein: The suspension support mounting member is a lifting ear, and a lifting hole is provided in the lifting ear; A suspension rod is passed through the suspension hole; two suspension rods are arranged opposite to each other along the installation plane direction of each supporting structure outside the multi-coil integral inner frame; a total of eight suspension rods, four groups of opposite suspension rods, are provided.

10. The conduction-cooled superconducting magnet assembly according to claim 8, wherein: A high-thermal-conductivity soft metal foil is provided between the cold-end support seat, the terminal board, the lower support plate and the mounting plane of the outer surface of each flange plate of the multi-coil integral inner skeleton.

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