Suspension support mechanism for small conductively cooled superconducting magnets

Abstract

The application relates to a suspension support mechanism of a small conductive cooling superconducting magnet, which comprises a cold mass support seat, a first low-thermal-conductivity pull rod, a joint support seat, a second low-thermal-conductivity pull rod and a normal-temperature support seat; the outer side of the cold mass is uniformly arranged with the cold mass support seat, and the inner side is arranged with a first low-thermal-conductivity pull rod spherical surface connection; the inner side of the upper and lower flanges of a vacuum container is fixed with the normal-temperature support seat, and the inner side is arranged with a second low-thermal-conductivity pull rod spherical surface connection; the second low-thermal-conductivity pull rod passes through the through holes in the upper and lower end plates of a cold shield; the first low-thermal-conductivity pull rod and the second low-thermal-conductivity pull rod are connected together through the joint support seat; the joint support seat is connected with a thermal-conductivity support belt; one end of the thermal-conductivity support belt is connected and fixed on the joint support seat; the other end of the thermal-conductivity support belt is connected and fixed on the upper end plate or the lower end plate of the cold shield. The application reduces the use quantity of the pull rod support assembly, realizes the support function, simplifies the internal structure of the superconducting magnet and reduces the heat leakage of the cooling system.

Description

Technical Field

[0001] This invention relates to a support and mounting structure for a small conductive cooling superconducting magnet, belonging to the field of superconducting magnet technology. Background Technology

[0002] Conductive cooling of superconducting magnets involves directly cooling the cold mass containing the superconducting coils with a cryostat. Steady-state operation does not require the use of refrigerants such as liquid helium, thus freeing superconducting devices from the constraints of helium resource shortages and becoming an important development direction for superconducting magnets. Because there is no container for storing liquid helium, the total mass and volume of the cold mass containing the superconducting coils are significantly reduced. However, due to limitations in the temperature uniformity of the cold mass, purely conductive cooling superconducting magnets are typically small. Compared to medium and large superconducting magnets, this allows for a more simplified internal suspension support structure.

[0003] In the laboratory research phase, most conductively cooled superconducting magnets are vertically placed with room-temperature apertures. Suspension supports primarily serve to withstand the weight of the cooled mass itself, so these systems are typically simplified to a vertical suspension configuration. The article "Design and Experiment of Conductively Cooled Cryogenic Superconducting Magnet System," published in the 5th issue (2015, Serial No. 207) of *Cryogenic Engineering*, introduces the structural design of a conductively cooled cryogenic superconducting magnet system, which employs a suspension support system.

[0004] However, with the increasing application of conductively cooled superconducting magnets in medical and industrial fields, factors such as long-distance transportation, earthquakes, and the periodic movement of the magnetic medium along the axis within a room-temperature aperture necessitate consideration of multi-degree-of-freedom stress safety issues in suspended support systems. Therefore, referring to large and medium-sized superconducting magnets, most product-level superconducting magnet solutions employ suspended support structures with six degrees of freedom constraint capabilities, primarily based on axial restraint, with the cold shield and cold mass supported separately. Thus, such conductively cooled superconducting magnets contain two independent six-degree-of-freedom suspended support structures. However, while reliability is improved, the complexity of the magnet's internal structure also increases, and the addition of support components increases heat leakage in the cooling system.

[0005] Compared to liquid helium immersion-cooled superconducting magnets, small conduction-cooled superconducting magnets have lighter cold mass and cold shields. If the same support method is used as the former, it is obviously "overly constrained".

[0006] Therefore, it is necessary to design the internal suspension support structure for small conductive cooling superconducting magnets appropriately in order to reduce heat leakage from the support, increase the degree of freedom of the support constraint to improve the performance of the magnet system, and simplify the manufacturing process by reducing the complexity of the support. Summary of the Invention

[0007] The purpose of this invention is to provide a suspension support mechanism for a small conductive cooling superconducting magnet, which aims to reduce heat leakage from the support, increase the degree of freedom of the support constraint to improve the performance of the magnet system, and simplify the manufacturing process by reducing the complexity of the support.

[0008] To achieve the above-mentioned objectives, the present invention provides a suspension support mechanism for a small conductive cooling superconducting magnet, comprising a cold mass support base, a first low thermal conductivity tie rod, a joint support base, a second low thermal conductivity tie rod, and a room temperature support base;

[0009] The outer side of the cold mass is provided with an outer frame, and stainless steel rings are provided at both ends of the outer frame. More than three cold mass support seats are evenly distributed on the stainless steel rings at both ends.

[0010] The cold mass support seat has a through hole, through which the first low thermal conductivity pull rod passes;

[0011] The first low thermal conductivity pull rod is disposed along the axial direction of the cold mass toward the other end of the cold mass, and at the same time, the first low thermal conductivity pull rod is disposed outward along the diameter direction of the cold mass;

[0012] The room temperature support bases are fixed inside the upper and lower flanges of the vacuum container, matching the number and distribution of the cold mass support bases.

[0013] The ambient temperature support base is provided with a through hole, through which a second low thermal conductivity pull rod is inserted;

[0014] Through holes are provided on the upper and lower end plates of the cold screen; the second low thermal conductivity pull rod passes through the through holes without obstruction and is positioned in the direction of the cold mass;

[0015] The first low thermal conductivity tie rod and the second low thermal conductivity tie rod are connected together through the joint support seat;

[0016] A heat-conducting support belt is connected to the joint support seat;

[0017] One end of the thermally conductive support strip is connected and fixed to the joint support seat;

[0018] The other end of the thermally conductive support strip is connected and fixed to the upper or lower end plate of the cold shield.

[0019] As a further improvement of the present invention, each end of the cold mass is provided with 4 cold mass support seats; the cold mass support seats at each end are evenly distributed and the included angle between them is 90°.

[0020] Furthermore, the first low thermal conductivity pull rod disposed at the upper end of the cold mass is disposed adjacent to the first low thermal conductivity pull rod disposed at the lower end of the cold mass.

[0021] As a further improvement of the present invention, the angle between the axis of the first low thermal conductivity pull rod and the central axis of the cold mass is α, where α = 20° ± 5°.

[0022] As a further improvement of the present invention, the through holes provided on the upper and lower end plates of the cold screen are round holes, and the inner diameter of the through holes is more than 10 mm larger than the outer diameter of the second low thermal conductivity pull rod.

[0023] Furthermore, the inner diameter of the through hole is 20 mm larger than the outer diameter of the second low thermal conductivity pull rod.

[0024] As a further improvement of the present invention, the first low thermal conductivity pull rod and the second low thermal conductivity pull rod are double-ended screws;

[0025] The cold mass support and the normal temperature support are provided with through holes for the screw to pass through;

[0026] The joint support is a hollow structure, including a shell, with a mounting and fixing cavity in the middle of the shell;

[0027] The mounting cavity has an open window; both ends of the mounting cavity have through holes for the screw to pass through;

[0028] The first low thermal conductivity tie rod is connected to the cold mass support seat and the joint support seat through a screw and nut structure;

[0029] The second low thermal conductivity tie rod is connected to the room temperature support base and the joint support base by a screw and nut structure.

[0030] Furthermore, the inner diameter of the through holes provided on the cold mass support, the normal temperature support, and the joint support is 2-4 mm larger than the outer diameter of the screw through which it passes.

[0031] Furthermore, the through holes provided on the cold mass support, the normal temperature support, and the joint support have a concave spherical surface on the side near the nut fixing point;

[0032] A spherical washer is also provided on the screw that passes through the through hole, and the spherical surface of the spherical washer falls within the concave spherical surface;

[0033] The nut for fixing the screw is located on one side of the plane of the spherical washer.

[0034] Furthermore, at the root of the external thread of the screw, there are two symmetrical flat surfaces that form a wrench clamping part.

[0035] As a further improvement of the present invention, the cross-section of the thermally conductive support strip is "Z" shaped;

[0036] The other end of the thermally conductive support strip is connected and fixed to the upper or lower end plate of the cold shield near the joint support seat.

[0037] Furthermore, the thermally conductive support strip is made of hard aluminum alloy.

[0038] Furthermore, the outer side of the housing of the joint support seat is provided with a protrusion, and the protrusion is provided with a support belt hole;

[0039] The thermally conductive support strip is fixed to the protrusion of the joint support seat by fasteners passing through the support strip hole.

[0040] The suspension support mechanism for the miniature conductive cooling superconducting magnet of the present invention uses a vacuum container as a fixed shell. A room temperature support base is fixed on the upper and lower flanges of the shell. Then, a second low thermal conductivity tie rod, a joint support base, and a first low thermal conductivity tie rod are connected in sequence. Finally, the tie rod is connected to both ends of the cold mass through a cold mass support base. The tie rod support assembly is a rigid assembly that can withstand tension well. Four sets of tie rod support assemblies are provided at each of the upper and lower ends of the cold mass. The tie rod support assemblies are inclined outwards, so as to withstand the forces of the three degrees of freedom of the cold mass.

[0041] The suspension support mechanism for the miniature conductive cooling superconducting magnet of the present invention has a concave spherical surface at the through hole of the screw connection part, which is then fixed with a spherical gasket to form a ball joint, thereby giving the tie rod support assembly a certain attitude angle adaptive adjustment function.

[0042] The suspension support mechanism for the miniature conductive cooling superconducting magnet of the present invention has the following advantages compared with existing suspension support structures:

[0043] 1. The first low thermal conductivity tie rod and the second low thermal conductivity tie rod are generally made of high-strength non-metallic composite material; two symmetrical flat surfaces are provided at the root of the external thread of the screw at both ends as wrench clamping parts, which can help fix the tie rod during the tightening of the nut, thereby making up for the defect that the external thread strength formed by the non-metallic composite material is relatively poor compared with the metal material, so that the entire tie rod support assembly is reliably connected.

[0044] The position of the parallel flat surface must be such that it protrudes outside the through hole after assembly, so that it can be easily fixed with clamping tools during the tightening of the nut, preventing it from rotating as the nut is tightened, and facilitating tightening.

[0045] 2. The thermally conductive support belt with a "Z" shape structure is used to assist in fixing the cold screen. The thermally conductive support belt is made of hard aluminum alloy, which can conduct heat efficiently and use the temperature of the cold screen to achieve thermal insulation of the joint support seat. At the same time, the material has high strength and can play a role in supporting the cold screen. The "Z" shape structure design can automatically adapt to the strain caused by cold contraction.

[0046] 3. For conductive cooling superconducting magnets, flexible conductive tape is used to connect the cold mass to the second-stage cold head of the helium refrigerator, and flexible conductive tape is also used to connect the cold shield to the first-stage cold head of the helium refrigerator. This allows for slight displacement of the suspended support structure under external forces. The connection points between the screws at both ends of the first and second low thermal conductivity pull rods and the cold mass support, ambient temperature support, and joint support are equipped with ball joints formed by the fit of concave spherical surfaces and spherical washers, enabling the pull rod support assembly to withstand impacts from various degrees of freedom with a certain acceleration. For the joint support, after the first and second low thermal conductivity pull rods are installed in place, a gap of 2–5 mm should be left between the ends of the two pull rods.

[0047] 4. The spherical gasket is preferably made of brass. If the spherical gasket is made of stainless steel, the spherical contact surface needs to be polished and passivated so that the ball joint component can play a good self-adjusting role and resist impact.

[0048] 5. The present invention preferably uses 8 sets of tie rod support components, with 4 sets as a group. The two groups provide opposite pulling forces to the cold mass in the axial direction. The two sets of tie rod components on the opposite side are staggered by a distance in the circumferential direction. Each set of tie rod components provides 2 to 3 degrees of freedom of constraint. At the same time, the cold screen and the cold mass share a set of tie rod support components, and no additional fasteners are needed.

[0049] The suspended support mechanism of this invention reduces the number of tie rod support components by half compared to conventional designs. After the equipment is installed, the axial direction of the cold mass is the main load-bearing direction, which is supported by four sets of tie rod support components at the top and bottom. During equipment transportation or earthquakes, its flexible support structure can provide constraints on the movement of all six degrees of freedom.

[0050] While fully realizing its supporting function, this invention simplifies the internal structure of the superconducting magnet and reduces heat leakage in the superconducting magnet cooling system. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the overall application state of the suspension support mechanism for the small conductive cooling superconducting magnet of the present invention.

[0052] Figure 2 for Figure 1 Half-section view

[0053] Figure 3 for Figure 1 A schematic diagram of the overall structure of the cold mass (including the first low thermal conductivity tie rod);

[0054] Figure 4 This is a schematic diagram of the overall structure of the tie rod device;

[0055] Figure 5 This is a schematic diagram of the overall structure of the tie rod;

[0056] Figure 6 This is a cross-sectional view of the flat side of the tie rod;

[0057] Figure 7 This is a sectional view of the joint support.

[0058] Figure 8 This is a cross-sectional view of the joint support in use. Detailed Implementation

[0059] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0060] This invention relates to a room-temperature, vertically placed conductive-cooled superconducting magnet. The suspension support mechanism for this miniature conductive-cooled superconducting magnet is described in the following application configuration: Figure 1 , Figure 2 As shown.

[0061] The upper flange 11 and lower flange 12 of the vacuum container, the outer cylinder of the vacuum container (hidden in the figure), and the inner cylinder 15 of the vacuum container are connected together to form the vacuum container chamber. The upper flange 11 of the vacuum container is equipped with a helium refrigerator, which can output cooling capacity (up to 4K, -269.15℃).

[0062] The vacuum container chamber is equipped with a cold shield, which is composed of the upper end plate 21, the lower end plate 22, the outer cylinder (hidden in the figure), and the inner cylinder 24 of the cold shield connected together. The cold shield is a shielding chamber for the cold energy, and the upper end plate 21 of the cold shield is flexibly thermally connected to the first stage cold head of the helium refrigerator.

[0063] The target object to be fixed by this invention is located inside the cold screen. The cold mass of the superconducting magnet, referred to as cold mass 31, is used for conductive cooling. The cold mass 31 is in contact with the secondary cold head of the helium refrigerator through a flexible cold-conducting connection component (hidden in the figure). The inner side of the cold mass 31 is a skeleton inner cylinder 34, on which a superconducting coil 312 is provided, and the outer side is provided with an outer skeleton 311.

[0064] The suspension support mechanism for the miniature conductive cooling superconducting magnet of the present invention is specifically implemented as follows: Cold mass support seats 32 are provided at both ends (stainless steel rings) of the outer wall of the outer frame 311 of the cold mass 31. Each cold mass support seat 32 has a through hole through which a first low thermal conductivity pull rod 33 passes. The first low thermal conductivity pull rod 33 is positioned along the central axis of the cold mass 31 towards the other end of the cold mass 31 (i.e., the first low thermal conductivity pull rod 33 fixed on the lower cold mass support seat 32 is positioned upwards, while the first low thermal conductivity pull rod 33 fixed on the upper cold mass support seat 32 is positioned downwards). Simultaneously, the first low thermal conductivity pull rod 33 is positioned outwards along the horizontal direction of the cold mass 31. Further reference... Figure 2 (The image hides the upper cold mass support 32 and its supporting components such as the first low thermal conductivity pull rod 33; only the fixing plate 321 of the cold mass support 32 is shown.) A room temperature support 13 is provided inside the upper flange 11 (or lower flange 12) of the vacuum container. The room temperature support 13 has a through hole through which a second low thermal conductivity pull rod 14 is inserted. A through hole 23 is provided on the upper end plate 21 (or lower end plate 22) of the cold screen. The second low thermal conductivity pull rod 14 passes through the 23 and enters the cold screen cavity. Since the second low thermal conductivity pull rod 14 passes obliquely through the through hole 23, when the through hole 23 is a round hole, the diameter of the through hole 23 needs to be significantly larger than the outer diameter of the second low thermal conductivity pull rod 14, greater than 10 mm, preferably 20 mm. The end of the first low thermal conductivity pull rod 33 and the end of the second low thermal conductivity pull rod 14 are connected together by a joint support 4. The angle between the axis of the first low thermal conductivity pull rod 33 and the central axis of the cold mass 31 is α, where α = 20° ± 5°, and α = 18° in the figure. This allows the first low thermal conductivity pull rod 33 to apply both vertical and horizontal tension to the cold mass 31. If the angle α is too small, the horizontal component of the force that the pull rod support assembly can withstand is small and insufficient to resist the horizontal force of the cold mass 31. If the angle α is too large, the position of the room temperature support 13 on the upper and lower flanges of the vacuum container needs to be set outward, or even beyond the flange range of the vacuum container.

[0065] The length of the second low thermal conductivity pull rod 14 is shorter than the length of the first low thermal conductivity pull rod 33. Therefore, the joint support 4 is located on the cold screen end plate (cold screen upper end plate 21 or cold screen lower end plate 22) where the through hole 23 through which the second low thermal conductivity pull rod 14 passes is located. A thermally conductive support strip 5 is also connected to the joint support 4 and connected to the nearby cold screen end plate. The cross-section of the thermally conductive support strip 5 is "Z" shaped, that is, the length of the thermally conductive support strip 5 has a certain amount of redundancy. The thermally conductive support strip 5 is made of a material with good thermal conductivity and good strength, such as hard aluminum alloy. The thermally conductive support strip connects the joint support 4 to the cold screen, and uses the temperature of the cold screen to achieve thermal insulation of the joint support 4 (and the first low thermal conductivity pull rod 33 and the second low thermal conductivity pull rod 14 connected to it). At the same time, the hard aluminum alloy has good strength and can support the cold screen, while the "Z" shape can automatically adapt to the additional strain caused by the contraction and expansion of related components due to cooling.

[0066] Further reference Figure 3 The cold mass 31 has four cold mass support seats 32 at both ends, and the four cold mass support seats 32 at each end are evenly distributed on the outer wall of the end. Each cold mass support seat 32 is fitted with one of the first low thermal conductivity tie rods 33. That is, the upper end of the cold mass 31 is provided with four sets of tie rod support assemblies, which are connected to the lower flange 12 of the vacuum container, while the lower end of the cold mass 31 is also provided with four sets of tie rod support assemblies, which are connected to the upper flange 11 of the vacuum container. The four sets of tie rod support assemblies at the top and bottom are arranged crosswise, thereby fixing the cold mass 31 in the vacuum container chamber.

[0067] In theory, only 3 sets of tie rod support components are needed on each side to achieve positioning and fixation (three points determine the plane), but using 4 sets of tie rod support components can form a backup; and the 4 sets of tie rod support components are spaced 90° apart from each other, so they can fully bear the horizontal left and right and front and back stresses, and then jointly bear the upward or downward force.

[0068] Furthermore, the tie rod support assembly at the upper end of the cold mass 31 and the tie rod support assembly at the lower end of the cold mass 31 are arranged adjacent to each other, thereby freeing up other surfaces on the cold mass 31 for the installation of electrical connection components and highly thermally conductive flexible connectors, etc.

[0069] The cold mass support 32, the first low thermal conductivity tie rod 33, the joint support 4, the second low thermal conductivity tie rod 14, and the room temperature support 13 are connected together to form a tie rod support assembly. The cold mass support 32 is fixed to the cold mass 31, while the room temperature support 13 is fixed to the upper and lower flanges of the vacuum container chamber. The cold mass support 32, the joint support 4, and the room temperature support 13 are preferably made of stainless steel for easy processing and welding; while the first low thermal conductivity tie rod 33 and the second low thermal conductivity tie rod 14 are preferably made of high-strength non-metallic composite material, which provides excellent thermal insulation and prevents cold loss.

[0070] refer to Figure 4 The first low thermal conductivity pull rod 33, the joint support 4, and the second low thermal conductivity pull rod 14 are preferably located on the same axis. Further reference Figure 5 The first low thermal conductivity pull rod 33 or the second low thermal conductivity pull rod 14 is a double-ended screw with external threads 61 at both ends; the external thread 61 end of the pull rod is inserted into the through hole of the cold mass support seat 32, or the through hole of the normal temperature support seat 13, or the through hole of the joint support seat 4, and is adjusted and locked by the nut 73.

[0071] Furthermore, a flat surface 62 is provided at the root of the external thread 61 (i.e., the inner side of the tie rod); see reference. Figure 6 Along the axis of the pull rod, two symmetrical flat surfaces 62 are preferably provided at the same position to form a clamping part for wrench operation. When the wrench tightens the nut 73 for adjustment and locking, the flat surface 62 near the nut 73 is clamped by the wrench at the same time to prevent the pull rod from rotating with it. Since the pull rod is made of non-metallic composite material, the strength of its external thread 61 is also poor. Therefore, by clamping the flat surface 62 by the wrench, the stress on the pull rod during tightening can also be improved, and the external thread 61 can be protected.

[0072] The specific structure of the joint support 4 is referenced. Figure 7 The joint support 4 has a hollow structure, including a shell 41, with a mounting cavity 42 in the middle. The mounting cavity 42 has an open window, allowing fasteners to be inserted into the mounting cavity 42 from the outside, and a wrench to be inserted for operation. Both ends of the mounting cavity 42 are provided with pull rod holes 43, the diameter of which is 2-4 mm larger than the outer diameter of the pull rod (first low thermal conductivity pull rod 33, or second low thermal conductivity pull rod 14) through which it passes. The inner side of the pull rod hole 43 is machined to form a concave spherical surface 44. The shell 41 of the joint support 4 has a protrusion 45 on its exterior, with a support strip hole 46 inside for installing the thermally conductive support strip 5.

[0073] When using the joint support 4, refer to... Figure 8The external thread 61 end of the pull rod (first low thermal conductivity pull rod 33, or second low thermal conductivity pull rod 14) is inserted into the pull rod hole 43, with the end located within the mounting and fixing cavity 42. A spherical washer 71, a spring washer 72, and a locking nut 73 are then sequentially fitted onto the rod. The spherical surface of the spherical washer 71 rests within the concave spherical surface 44. The locking nut 73 is tightened with a wrench to fix the pull rod onto the joint support 4. The spherical washer 71 is preferably made of brass, as brass has self-lubricating properties and can adaptively adjust its posture angle within the concave spherical surface 44. Alternatively, the spherical washer 71 can be made of stainless steel, but in this case, the spherical contact surface needs to be polished and passivated.

[0074] The through holes on the cold mass support 32 and the normal temperature support 13 are also set with reference to the tie rod hole 43 on the joint support 4, and the outer side is provided with a concave spherical surface. In use, the external thread 61 end of the tie rod (first low thermal conductivity tie rod 33 or second low thermal conductivity tie rod 14) is inserted into the through hole, and then passes through the spherical washer 71, spring washer 72 and locking nut 73 in sequence to connect and fix it. Through the cooperation of the spherical washer 71 and the concave spherical surface, the tie rod also has the function of adaptively adjusting the attitude angle.

[0075] Furthermore, the protrusion 45 is fixedly connected to the thermally conductive support strip 5. The support strip mounting screw 74 passes through the support strip hole 46 on the protrusion 45 and into the thermally conductive support strip 5, and then is screwed into the nut 75 to achieve fixation; of course, the two can also be directly connected by rivets. The other end of the thermally conductive support strip 5 is also connected and fixed to the cold screen end plate (cold screen upper end plate 21, or cold screen lower end plate 22) by fasteners (screws, nuts, or rivets).

[0076] The suspension support mechanism for the small conductive cooling superconducting magnet of the present invention uses a vacuum container as a fixed shell (composed of an upper flange 11, a lower flange 12, an outer cylinder, and an inner cylinder 15). A room temperature support seat 13 is fixed on the upper and lower flanges of the shell. Then, a second low thermal conductivity pull rod 14, a joint support seat 4, and a first low thermal conductivity pull rod 33 are connected in sequence. Finally, it is connected to both ends of the cold mass 31 through a cold mass support seat 32. The pull rod support assembly is a rigid assembly that can withstand tension well. Four sets of pull rod support assemblies are provided at each of the upper and lower ends of the cold mass 31. The pull rod support assemblies are also inclined outwards, so as to withstand the force of the cold mass 31 in all directions. The joint support 4 is also provided with a protrusion 45, which connects to the heat-conducting support strip 5 and is finally fixed to the upper and lower end plates of the cold screen. The heat-conducting support strip 5 is made of hard aluminum alloy, which can conduct heat efficiently and use the temperature of the cold screen to achieve thermal insulation of the joint support 4. At the same time, the material has high strength and can play the role of supporting the cold screen. The "Z" shaped structure design can automatically adapt to the strain caused by cold contraction.

[0077] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A suspension support mechanism for a small conductive cooling superconducting magnet, characterized in that, It includes a cold mass support base, a first low thermal conductivity tie rod, a joint support base, a second low thermal conductivity tie rod, and a room temperature support base; The outer side of the cold mass is provided with an outer frame, and stainless steel rings are provided at both ends of the outer frame. More than three cold mass support seats are evenly distributed on the stainless steel rings at both ends. The cold mass support seat has a through hole, through which the first low thermal conductivity pull rod passes; The first low thermal conductivity pull rod is disposed along the axial direction of the cold mass toward the other end of the cold mass, and at the same time, the first low thermal conductivity pull rod is disposed outward along the diameter direction of the cold mass; The room temperature support bases are fixed inside the upper and lower flanges of the vacuum container, matching the number and distribution of the cold mass support bases. The ambient temperature support base is provided with a through hole, through which a second low thermal conductivity pull rod is inserted; Through holes are provided on the upper and lower end plates of the cold screen; the second low thermal conductivity pull rod passes through the through holes without obstruction and is positioned in the direction of the cold mass; The first low thermal conductivity tie rod and the second low thermal conductivity tie rod are connected together through the joint support seat; A heat-conducting support belt is connected to the joint support seat; One end of the thermally conductive support strip is connected and fixed to the joint support seat; The other end of the thermally conductive support strip is connected and fixed to the upper or lower end plate of the cold shield. The first low thermal conductivity pull rod and the second low thermal conductivity pull rod are double-ended screws; The cold mass support and the normal temperature support are provided with through holes for the screw to pass through; The joint support is a hollow structure, including a shell, with a mounting and fixing cavity in the middle of the shell; The mounting cavity has an open window; both ends of the mounting cavity have through holes for the screw to pass through; The first low thermal conductivity tie rod is connected to the cold mass support seat and the joint support seat through a screw and nut structure; The second low thermal conductivity tie rod is connected to the room temperature support base and the joint support base by a screw and nut structure; The through holes provided on the cold mass support, the normal temperature support, and the joint support have a concave spherical surface on the side near the nut fixing point. A spherical washer is also provided on the screw that passes through the through hole, and the spherical surface of the spherical washer falls within the concave spherical surface; The nut for fixing the screw is located on one side of the plane of the spherical washer.

2. The suspension support mechanism for the miniature conductive cooling superconducting magnet as described in claim 1, characterized in that, The cold mass has four cold mass support seats at each end; the cold mass support seats at each end are evenly distributed and the included angle between them is 90°.

3. The suspension support mechanism for a small conductive cooling superconducting magnet as described in claim 2, characterized in that, The first low thermal conductivity pull rod at the upper end of the cold mass is arranged adjacent to the first low thermal conductivity pull rod at the lower end of the cold mass.

4. The suspension support mechanism for the small conductive cooling superconducting magnet as described in claim 3, characterized in that, The angle between the axis of the first low thermal conductivity pull rod and the central axis of the cold mass is α, where α = 20° ± 5°.

5. The suspension support mechanism for the miniature conductive cooling superconducting magnet as described in claim 1, characterized in that, The through holes provided on the upper and lower end plates of the cold screen are round holes, and the inner diameter of the through holes is more than 10 mm larger than the outer diameter of the second low thermal conductivity pull rod.

6. The suspension support mechanism for a small conductive cooling superconducting magnet as described in claim 1, characterized in that, At the root of the external thread of the screw, there are two symmetrical flat surfaces that form a wrench clamping part.

7. The suspension support mechanism for a small conductive cooling superconducting magnet as described in claim 1, characterized in that, The cross-section of the thermally conductive support strip is "Z" shaped; The other end of the thermally conductive support strip is connected and fixed to the upper or lower end plate of the cold shield near the joint support seat.

8. The suspension support mechanism for a small conductive cooling superconducting magnet as described in claim 7, characterized in that, The outer side of the housing of the joint support is provided with a protrusion, and the protrusion is provided with a support belt hole; The thermally conductive support strip is fixed to the protrusion of the joint support seat by fasteners passing through the support strip hole.

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