Superconducting magnet system

Abstract

The superconducting magnet system comprises an installation platform and a superconducting magnet device, the superconducting magnet device comprises a pulse tube refrigerator, a superconducting magnetic coil and a cooling cavity structure, the pulse tube refrigerator comprises a cold head component and a pulse source component, and the pulse source component is installed on the installation platform; the cooling cavity structure comprises a vertical cavity and a horizontal cavity, the cold head component is installed at the top of the vertical cavity and provided with a cold disc connecting column, and the cold disc connecting column is provided with a first-stage cold disc and a second-stage cold disc; a first-stage suspension cold disc and a second-stage suspension cold disc are arranged in the vertical cavity, the first-stage suspension cold disc is connected with the top of the vertical cavity through a first heat insulation column, and the second-stage suspension cold disc is connected with the first-stage suspension cold disc through a second heat insulation column; the first-stage suspension cold disc is connected with the first-stage cold disc through a flexible connection copper conduction band, and the second-stage suspension cold disc is connected with the second-stage cold disc through a flexible connection copper conduction band; the second-stage suspension cooling disc is provided with a cantilever component, and the superconducting magnetic coil is installed on the cantilever component and located in the horizontal cavity.

Description

Technical Field

[0001] The present application relates to the field of superconducting magnet testing equipment, and in particular to a superconducting magnet system. Background Art

[0002] The cryogen-free superconducting magnet-cryostat system is one of the tools currently used in low-temperature scientific exploration. The role of this system is to provide a low-temperature magnetic field environment for samples in superconducting experiments. This type of system does not require cryogen to operate the superconducting magnet and can operate stably and cost-effectively for a long time.

[0003] The refrigerant-free superconducting magnet system is cooled by refrigeration devices such as GM refrigerators and pulse tube refrigerators. The vibration during the operation of the refrigeration device will affect the magnetic field environment, and there is still room for improvement. Summary of the invention

[0004] In order to reduce the influence of vibration during operation of a refrigeration device on the magnetic field of a superconducting magnet system, the present application provides a superconducting magnet system.

[0005] A superconducting magnet system provided in this application adopts the following technical solution: A superconducting magnet system comprises a mounting platform and a superconducting magnet device, wherein the superconducting magnet device comprises a pulse tube refrigerator, a superconducting magnetic coil and a cooling cavity structure, wherein the pulse tube refrigerator comprises a cold head component and a pulse source component, wherein the pulse source component is mounted on the mounting platform; wherein the cooling cavity structure comprises a vertical cavity and a horizontal cavity, wherein the vertical cavity is mounted on the mounting platform, wherein a vacuum valve is mounted on the side wall of the vertical cavity, wherein the horizontal cavity is connected to the side wall of the vertical cavity, wherein the cold head component is mounted on the top of the vertical cavity, wherein the cold head component is provided with a cold plate connecting column, wherein the cold plate connecting column is provided with a primary cold plate and a secondary cold plate, wherein the secondary cold plate is located on the primary cold plate , the first-level cold plate and the second-level cold plate are located in the vertical cavity; the inside of the vertical cavity is provided with a first-level suspended cold plate and a second-level suspended cold plate in sequence from top to bottom, the first-level suspended cold plate is connected to the top of the vertical cavity by a first insulation column, and the second-level suspended cold plate is connected to the first-level suspended cold plate by a second insulation column; the first-level suspended cold plate is connected to the first-level cold plate by a soft-connecting copper conductor, and the second-level suspended cold plate is connected to the second-level cold plate by a soft-connecting copper conductor; the second-level suspended cold plate is provided with a cantilever component, and the superconducting magnetic coil is installed at one end of the cantilever component away from the second-level suspended cold plate, and is located in the horizontal cavity.

[0006] By adopting the above technical solution, during the operation of the superconducting magnet system, the pulse tube refrigerator plays a cooling role, and the pulse tube refrigerator absorbs heat through the cold head component, thereby achieving the purpose of cooling the superconducting magnetic coil. The main vibrating component in the refrigeration process of the pulse tube refrigerator is the pulse source component, and the pulse source component and the cold head component are separately installed on the installation platform, so that the vibration of the pulse source component is not easy to act on the superconducting magnetic coil. The superconducting magnetic coil is installed in the horizontal cavity of the cooling cavity structure, and the cooling cavity structure is evacuated through a vacuum valve to reduce the influence of the heat conduction of air molecules on the refrigeration process of the cold head component.

[0007] The cold head component cools the first-level suspended cold plate through the first-level cold plate, cools the second-level suspended cold plate through the second-level cold plate, and the second-level suspended cold plate cools the superconducting magnetic coil through the cantilever component, so that the superconducting magnetic coil is cooled down to the superconducting temperature range in a step-by-step cooling manner, making it easier for the superconducting magnetic coil to maintain a stable low-temperature state.

[0008] The superconducting magnetic coil is suspended and installed through a primary suspended cold plate, a secondary suspended cold plate, a first insulation column and a second insulation column. In addition, heat is transferred between the primary cold plate and the primary suspended cold plate through a soft-connected copper conductive tape, and heat is transferred between the secondary cold plate and the secondary suspended cold plate through a soft-connected copper conductive tape. This makes it difficult for the vibration of the cold head component to be transmitted to the primary suspended cold plate and the secondary suspended cold plate, which is beneficial to further reduce the vibration of the superconducting magnetic coil during operation and to maintain a stable magnetic field environment provided by the superconducting magnetic coil.

[0009] Optionally, the cooling cavity structure serves as a primary radiation barrier, the vertical cavity is an integral cylindrical structure, and the cold plate connecting column deviates from the center of the vertical cavity.

[0010] By adopting the above technical solution, the cooling cavity structure can serve as a primary radiation barrier to shield the thermal radiation effect of the room temperature environment, which is beneficial to reduce the impact of thermal radiation on the refrigeration work of the superconducting magnet system. The temperature of the cooling cavity structure is higher than that of the cold plate connecting column. The heat radiation of various parts of the inner wall of the vertical cavity has a greater probability of passing through the center of the vertical cavity. By making the cold plate connecting column deviate from the center of the vertical cavity, the thermal radiation effect of the vertical cavity on the cold plate connecting column can be reduced.

[0011] Optionally, a mounting seat plate is provided at one end of the cantilever member away from the secondary suspended cold plate, and the superconducting magnetic coil is mounted on the mounting seat plate; the mounting seat plate is provided with a secondary radiation barrier, and the secondary radiation barrier surrounds the superconducting magnetic coil.

[0012] By adopting the above technical solution, the temperature of the cooling cavity structure is higher than that of the superconducting magnetic coil and the cold head component. The cooling cavity structure will inevitably have a thermal radiation effect on the superconducting magnetic coil. By setting a secondary radiation barrier on the mounting plate, the effect of thermal radiation on the superconducting magnetic coil can be minimized.

[0013] Optionally, the superconducting magnetic coil has two coil lead wires, and the cantilever component is detachably connected to a plurality of wire pressing plates, and the wire pressing plates and the cantilever component jointly press the two coil lead wires.

[0014] By adopting the above technical solution, the coil pin wire is a local structure of the superconducting magnetic coil, and the temperature change of the coil pin wire will indirectly affect the superconducting working state of the superconducting magnetic coil. By using the wire pressing plate to press the coil pin wire onto the cantilever component, the coil pin wire can be subjected to a more reliable cooling effect, which is conducive to reducing the influence of the coil pin wire on the superconducting working state of the superconducting magnetic coil.

[0015] Optionally, the first heat-insulating column and the second heat-insulating column are both hollow tubes, and the peripheral walls of the hollow tubes are provided with through holes.

[0016] By adopting the above technical solution, a hollow tube is used as the first insulation column and the second insulation column, and a through hole is set on the peripheral wall of the hollow tube, so that the through hole can have a barrier effect on the heat transfer process of the hollow tube, which is beneficial to increase the insulation effect of the first insulation column on the cooling cavity structure and the first-level suspended cold plate, and increase the insulation effect of the second insulation column on the first-level suspended cold plate and the second-level suspended cold plate.

[0017] Optionally, a plurality of through holes are provided, and the through holes are spaced apart along the axial direction of the hollow tube, and adjacent through holes are staggered along the circumferential direction of the hollow tube.

[0018] By adopting the above technical solution, adjacent through holes on the outer peripheral wall of the hollow tube are staggered in the circumferential direction, which can make the heat transfer path of the peripheral wall of the hollow tube more tortuous, thereby further improving the thermal insulation effect of the first thermal insulation column and the second thermal insulation column.

[0019] Optionally, the hollow tube is provided with two node filling columns, the node filling columns are interference fit with the hollow tube, the material of the node filling columns is the same as that of the hollow tube, and the two node filling columns are respectively located at both ends of the hollow tube.

[0020] By adopting the above technical solution, the two ends of the hollow tube are connection nodes, and the structural strength of the hollow tube connection nodes can be increased by arranging node filling columns at the two ends of the hollow tube.

[0021] Optionally, the first insulation column and the second insulation column are arranged in one-to-one correspondence, and the first insulation column and the second insulation column are integrally connected to form a long insulation column, and the long insulation column passes through the first-level suspended cold plate and is connected to the first-level suspended cold plate in a gap-fitting manner.

[0022] By adopting the above technical solution, the first insulation column and the second insulation column are integrally connected to form a long insulation column. The long insulation column simultaneously connects the first suspended cold plate and the second suspended cold plate, which can increase the stability of the installation state of the first suspended cold plate and the second suspended cold plate.

[0023] Optionally, a connecting sleeve is sleeved on the middle part of the long insulation column, and the connecting sleeve is a metal part. The connecting sleeve is fixedly connected to the long insulation column, and the connecting sleeve has an external thread. The connecting sleeve is threadedly connected to two limit nuts, and the two limit nuts jointly clamp the first-level suspended cold plate.

[0024] By adopting the above technical solution, the insulation material is usually a non-metallic material, and a metal connecting sleeve is set in the middle part of the long insulation column. The connecting sleeve is connected to the first-level suspended cold plate, which can strengthen the middle connection node of the long insulation column. When the connecting sleeve is connected to the first-level suspended cold plate, two limit nuts are used to suspend the first-level suspended cold plate in the middle part of the long insulation column, making the disassembly and assembly of the first-level suspended cold plate more convenient; on the other hand, the height position of the two limit nuts can be adjusted, so that the height position of the first-level suspended cold plate can be adjusted as needed.

[0025] Optionally, a connecting sleeve is sleeved on the middle part of the long thermal insulation column, and the connecting sleeve is a metal part. The connecting sleeve is fixedly connected to the long thermal insulation column, and the connecting sleeve includes an external thread section and an optical axis section, and a step surface is provided between the external thread section and the optical axis section; the external thread section is provided with a limiting nut, and the limiting nut and the step surface jointly clamp the primary suspended cold plate.

[0026] By adopting the above technical solution, when the connecting sleeve is connected to the first-level suspended cold plate, the first-level suspended cold plate is clamped together by the limit nut and the step surface, so that the disassembly and assembly of the first-level suspended cold plate is more convenient.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. The superconducting magnetic coil is suspended and installed through a primary suspended cold plate, a secondary suspended cold plate, a first insulation column and a second insulation column. Moreover, heat is transferred between the primary cold plate and the primary suspended cold plate through a soft-connected copper conductive tape, and heat is transferred between the secondary cold plate and the secondary suspended cold plate through a soft-connected copper conductive tape, so that the vibration of the cold head component is not easily transmitted to the primary suspended cold plate and the secondary suspended cold plate, which is beneficial to further reduce the vibration of the superconducting magnetic coil during operation.

[0028] 2. By using the wire pressing plate to press the coil lead wires onto the cantilever component, the coil lead wires can be cooled more reliably, which is beneficial to reducing the influence of the coil lead wires on the superconducting working state of the superconducting magnetic coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0030] Figure 2 It is a schematic diagram of the state in which the first protective cover and the second protective cover are removed in Example 1.

[0031] Figure 3 It is a schematic diagram for reflecting the relative position relationship between the cold head component and the superconducting magnetic coil in Example 1.

[0032] Figure 4 It is a schematic diagram for illustrating the relative position relationship between the cold head component and the superconducting magnetic coil in another perspective in Example 1.

[0033] Figure 5 It is a schematic diagram used to reflect the connection relationship between the primary suspended cold plate and the secondary suspended cold plate in Example 2.

[0034] Figure 6 It is a schematic diagram used to reflect the connection relationship between the primary suspended cold plate and the secondary suspended cold plate in Example 3.

[0035] Figure 7 It is a schematic diagram used to reflect the connection relationship between the primary suspended cold plate and the secondary suspended cold plate in Example 4.

[0036] Description of reference numerals: 10. Superconducting magnet device; 1. Pulse tube refrigerator; 11. Cold head component; 111. Cold plate connecting column; 112. First-stage cold plate; 113. Second-stage cold plate; 12. Pulse source component; 13. Vacuum valve; 2. Superconducting magnetic coil; 21. Coil pin line; 3. Cooling cavity structure; 31. Vertical cavity; 311. Upper cylinder section; 312. Lower cylinder section; 32. Horizontal cavity; 33. Room temperature upper flange; 41. First-stage suspended cold plate; 42. Second-stage suspended cold plate; 51. First thermal insulation column; 511. First rod seat; 52. Second thermal insulation column; 521. Second rod seat; 53. Through hole; 54. Node filling column; 55. Long insulation column; 56. Connecting sleeve; 561. External thread; 562. External thread section; 563. Optical axis section; 57. Limit nut; 581. Spring washer; 582. Insulation gasket; 6. Soft-connected copper guide belt; 7. Cantilever member; 71. Mounting seat plate; 72. Secondary radiation barrier; 73. Wire pressing plate; 20. Mounting platform; 30. Shock-absorbing bracket; 40. First protective cover; 50. Second protective cover; 501. Upper cover body; 502. Lower cover body; 503. Horizontal cover body; 504. Mounting port; 60. Window component. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-7 This application is described in further detail.

[0038] Example 1 The present application embodiment discloses a superconducting magnet system. Figure 1-Figure 3 The superconducting magnet system includes a mounting platform 20 and a superconducting magnet device 10. The superconducting magnet device 10 includes a pulse tube refrigerator 1, a superconducting magnetic coil 2 and a cooling cavity structure 3. The pulse tube refrigerator 1 includes a cold head component 11 and a pulse source component 12. The cold end heat exchanger of the pulse tube refrigerator 1 is located at the cold head component 11, and the compressor of the pulse tube refrigerator 1 is located at the pulse source component 12. The mounting platform 20 is provided with a shock-absorbing bracket 30, and the pulse source component 12 is mounted on the mounting platform 20 through the shock-absorbing bracket 30. The cooling cavity structure 3 is installed on the mounting platform 20.

[0039] The mounting platform 20 is provided with a first protective cover 40 and a second protective cover 50. The first protective cover 40 is used to cover the pulse source component 12 and the shock-absorbing bracket 30, and the second protective cover 50 is used to cover the cooling cavity structure 3. The cooling cavity structure 3 is provided with a vacuum valve 13. The cold head component 11 is installed on the top of the cooling cavity structure 3. The superconducting magnetic coil 2 is located on the inner side of the cooling cavity structure 3. The cold head component 11 is used to cool the superconducting magnetic coil 2. The superconducting magnetic coil 2 can generate a 7T magnetic field.

[0040] When the superconducting magnet system is working, the vacuum device evacuates the inside of the cooling cavity structure 3 through the vacuum valve 13, and the cold head component 11 of the pulse tube refrigerator 1 cools the superconducting magnetic coil 2. Since the cold head component 11 and the pulse source component 12 are separately arranged, the vibration of the pulse source component 12 is not easy to affect the superconducting magnetic coil 2.

[0041] The cooling cavity structure 3 is made of metal material, and the outer surface of the cooling cavity structure 3 is a polished surface, so that the cooling cavity structure 3 can shield the thermal radiation of the room temperature environment, that is, the cooling cavity structure 3 serves as a primary radiation barrier.

[0042] Reference Figure 2 and Figure 3 The cooling cavity structure 3 includes a vertical cavity 31 and a horizontal cavity 32. The vertical cavity 31 is installed on the installation platform 20. The vertical cavity 31 includes an upper cylinder section 311 and a lower cylinder section 312. The lower end of the upper cylinder section 311 is connected to the upper end of the lower cylinder section 312. The lower end of the lower cylinder section 312 is a closed end. The upper cylinder section 311 is provided with a room temperature upper flange 33. The cold head component 11 is installed on the top of the upper cylinder section 311 through the room temperature upper flange 33. The vacuum valve 13 is connected to the side wall of the upper cylinder section 311, and the horizontal cavity 32 is connected to the side wall of the lower cylinder section 312. The horizontal cavity 32 is a square cylinder structure. The horizontal cavity 32 is provided with a window component 60 for placing a sample. The window component 60 is connected to the superconducting magnetic coil 2, and the window component 60 is located within the 7T magnetic field provided by the superconducting magnetic coil 2.

[0043] Reference Figure 1The second protective cover 50 includes an upper cover body 501, a lower cover body 502 and a horizontal cover body 503. The upper cover body 501 is used to cover the upper cylinder section 311, the lower cover body 502 is used to cover the lower cylinder section 312, and the horizontal cover body 503 is used to cover the horizontal cavity 32. The horizontal cover body 503 is provided with an installation port 504 for avoiding the window component 60.

[0044] Reference Figure 2 and Figure 3 The cold head component 11 is provided with a cold plate connecting column 111, and the cold plate connecting column 111 is staggered with the center line of the vertical cavity 31. The cold plate connecting column 111 is provided with a primary cold plate 112 and a secondary cold plate 113. The secondary cold plate 113 is located below the primary cold plate 112. The primary cold plate 112 and the secondary cold plate 113 are located in the vertical cavity 31.

[0045] Reference Figure 3 and Figure 4 A primary suspended cold plate 41 and a secondary suspended cold plate 42 are sequentially arranged inside the vertical cavity 31 from top to bottom. A plurality of first insulation columns 51 are arranged between the primary suspended cold plate 41 and the room temperature upper flange 33. First rod seats 511 are respectively arranged at both ends of the first insulation column 51, wherein the first rod seat 511 is connected to the room temperature upper flange 33, and another first rod seat 511 is connected to the primary suspended cold plate 41. A plurality of second insulation columns 52 are arranged between the secondary suspended cold plate 42 and the primary suspended cold plate 41, and second rod seats 521 are respectively arranged at both ends of the second insulation column 52, wherein one second rod seat 521 is connected to the primary suspended cold plate 41, and another second rod seat 521 is connected to the second suspended cold plate. The first insulation column 51 and the second insulation column 52 are made of G10 glass fiber material.

[0046] Reference Figure 4 The first-stage suspended cold plate 41 is connected to the first-stage cold plate 112 by a soft-connected copper conductive tape 6, and the second-stage suspended cold plate 42 is connected to the second-stage cold plate 113 by a soft-connected copper conductive tape 6; the second-stage suspended cold plate 42 is provided with a cantilever component 7, and the cantilever component 7 is located in the horizontal cavity 32. The end of the cantilever component 7 away from the second-stage suspended cold plate 42 is provided with a mounting seat plate 71, and the superconducting magnetic coil 2 is installed on the mounting seat plate 71. The mounting seat plate 71 is provided with a second-stage radiation barrier 72, and the second-stage radiation barrier 72 is a metal part with a cylindrical structure, and the second-stage radiation barrier 72 surrounds the superconducting magnetic coil 2.

[0047] Reference Figure 4 The superconducting magnetic coil 2 has two coil pin wires 21, which are niobium-titanium wires of the superconducting magnetic coil 2. The cantilever component 7 is detachably connected with a plurality of wire pressing plates 73 by screws, and the wire pressing plates 73 and the cantilever component 7 jointly press the two coil pin wires 21.

[0048] The implementation principle of a superconducting magnet system in the embodiment of the present application is as follows: during the operation of the superconducting magnet system, the pulse tube refrigerator 1 plays a cooling role, and the pulse tube refrigerator 1 absorbs heat through the cold head component 11, thereby achieving the purpose of cooling the superconducting magnetic coil 2. The main vibrating component in the refrigeration process of the pulse tube refrigerator 1 is the pulse source component 12, and the pulse source component 12 and the cold head component 11 are separately installed on the installation platform 20, so that the vibration of the pulse source component 12 is not easy to act on the superconducting magnetic coil 2. The superconducting magnetic coil 2 is installed in the horizontal cavity 32 of the cooling cavity structure 3, and the cooling cavity structure 3 is evacuated through the vacuum valve 13 to reduce the influence of the heat conduction of air molecules on the refrigeration process of the cold head component 11.

[0049] The cold head component 11 cools the first-level suspended cold plate 41 through the first-level cold plate 112, cools the second-level suspended cold plate 42 through the second-level cold plate 113, and the second-level suspended cold plate 42 cools the superconducting magnetic coil 2 through the cantilever component 7, so that the superconducting magnetic coil 2 is cooled to the superconducting temperature range in a step-by-step cooling manner, so that the superconducting magnetic coil 2 can more easily maintain a stable low-temperature state.

[0050] The superconducting magnetic coil 2 is suspended and installed through a primary suspended cold plate 41, a secondary suspended cold plate 42, a first insulation column 51 and a second insulation column 52, and heat is transferred between the primary cold plate 112 and the primary suspended cold plate 41 through a soft-connected copper conductive tape 6, and heat is transferred between the secondary cold plate 113 and the secondary suspended cold plate 42 through a soft-connected copper conductive tape 6, so that the vibration of the cold head component 11 is not easily transmitted to the primary suspended cold plate 41 and the secondary suspended cold plate 42, which is beneficial to further reduce the vibration of the superconducting magnetic coil 2 during operation and to maintain the stability of the magnetic field environment provided by the superconducting magnetic coil 2.

[0051] Example 2 Reference Figure 5 The difference between this embodiment and embodiment 1 is that the first heat-insulating column 51 and the second heat-insulating column 52 are both hollow tubes, and the peripheral wall of the hollow tube is provided with a through hole 53. The through hole 53 is a waist-shaped hole, and the length direction of the through hole 53 is relatively inclined to the length direction of the hollow tube. There are a plurality of through holes 53, and the through holes 53 are spaced apart along the axial direction of the hollow tube, and adjacent through holes 53 are staggered along the circumferential direction of the hollow tube. The through holes 53 can hinder the heat transfer process of the hollow tube, so that the tube wall of the hollow tube transfers heat in a tortuous path, so as to enhance the heat insulation effect of the hollow tube.

[0052] The hollow tube is provided with two node filling columns 54, which are interference fit with the hollow tube, and the material of the node filling columns 54 is the same as that of the hollow tube, and the two node filling columns 54 are respectively located at both ends of the hollow tube. The node filling columns 54 can strengthen the strength of the connection part of the hollow tube, making the installation state of the hollow tube more stable and reliable.

[0053] Example 3 Reference Figure 6 The difference between this embodiment and the first embodiment is that the first heat-insulating column 51 is only provided with a first rod seat 511 at the upper end, and the second heat-insulating column 52 is only provided with a second rod seat 521 at the lower end. The first heat-insulating column 51 and the second heat-insulating column 52 are arranged one by one, and the first heat-insulating column 51 and the second heat-insulating column 52 are integrally connected to form a long heat-insulating column 55, which passes through the first-stage suspension cold plate 41 and is connected to the first-stage suspension cold plate 41 in a clearance fit manner.

[0054] The middle part of the long heat-insulating column 55 is sleeved with a connecting sleeve 56, which is a metal part. The connecting sleeve 56 is fixedly connected to the long heat-insulating column 55, and the connecting sleeve 56 has an external thread 561. The connecting sleeve 56 is threadedly connected with two limit nuts 57, and the two limit nuts 57 jointly clamp the primary suspension cold plate 41. The limit sleeve is sleeved with a spring washer 581 and two insulation washers 582, which are respectively located at the upper and lower sides of the primary suspension cold plate 41, and the spring washer 581 is located on the side of the insulation washer 582 away from the primary suspension cold plate 41, and the limit nut 57 and the insulation washer 582 jointly clamp the spring washer 581.

[0055] When the connecting sleeve 56 is connected to the first-level suspended cold plate 41, two limit nuts 57 are used to suspend the first-level suspended cold plate 41 in the middle part of the long insulation column 55, so that the disassembly and assembly of the first-level suspended cold plate 41 is more convenient; on the other hand, the height position of the two limit nuts 57 can be adjusted, so that the height position of the first-level suspended cold plate 41 can be adjusted as needed.

[0056] Example 4 Reference Figure 7 The difference between this embodiment and embodiment 3 is that the structure of the connecting sleeve 56 of this embodiment is different from that of embodiment 3. The connecting sleeve 56 includes an external thread section 562 and an optical axis section 563. The outer diameter of the external thread section 562 is smaller than the outer diameter of the optical axis section 563. The external thread section 562 is located below the optical axis section 563. There is a step surface between the external thread section 562 and the optical axis section 563, and the step surface is arranged downward.

[0057] In this embodiment, only one limiting nut 57 is provided, and the limiting nut 57 is threadedly connected to the external thread section 562 . The limiting nut 57 and the step surface jointly clamp the primary suspended cold plate 41 .

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A superconducting magnet system, characterized in that: Comprising a mounting platform (20) and a superconducting magnet device (10), the superconducting magnet device (10) comprising a pulse tube refrigerator (1), a superconducting magnetic coil (2) and a cooling cavity structure (3), the pulse tube refrigerator (1) comprising a cold head component (11) and a pulse source component (12), the pulse source component (12) being mounted on the mounting platform (20); The cooling cavity structure (3) comprises a vertical cavity (31) and a horizontal cavity (32); the vertical cavity (31) is mounted on the mounting platform (20); a vacuum valve (13) is mounted on the side wall of the vertical cavity (31); the horizontal cavity (32) is connected to the side wall of the vertical cavity (31); the cold head component (11) is mounted on the top of the vertical cavity (31); the cold head component (11) is provided with a cold plate connecting column (111); the cold plate connecting column (111) is provided with a primary cold plate (112) and a secondary cold plate (113); the secondary cold plate (113) is located below the primary cold plate (112); and the primary cold plate (112) and the secondary cold plate (113) are located in the vertical cavity (31); A primary suspended cold plate (41) and a secondary suspended cold plate (42) are sequentially arranged inside the vertical cavity (31) from top to bottom; the primary suspended cold plate (41) is connected to the top of the vertical cavity (31) via a first insulation column (51), and the secondary suspended cold plate (42) is connected to the primary suspended cold plate (41) via a second insulation column (52); the primary suspended cold plate (41) is connected to the primary cold plate (112) via a soft connection copper conductive tape (6), and the secondary suspended cold plate (42) is connected to the secondary cold plate (113) via a soft connection copper conductive tape (6); the secondary suspended cold plate (42) is provided with a cantilever component (7), and the superconducting magnetic coil (2) is installed at one end of the cantilever component (7) away from the secondary suspended cold plate (42), and is located in the horizontal cavity (32).

2. A superconducting magnet system according to claim 1, characterized in that: The cooling cavity structure (3) serves as a primary radiation barrier, the vertical cavity (31) is an integral cylindrical structure, and the cold plate connecting column (111) deviates from the center of the vertical cavity (31).

3. A superconducting magnet system according to claim 2, characterized in that: An end of the cantilever component (7) away from the secondary suspended cold plate (42) is provided with a mounting seat plate (71), and the superconducting magnetic coil (2) is mounted on the mounting seat plate (71); the mounting seat plate (71) is provided with a secondary radiation barrier (72), and the secondary radiation barrier (72) surrounds the superconducting magnetic coil (2).

4. A superconducting magnet system according to claim 1, characterized in that: The superconducting magnetic coil (2) has two coil lead wires (21), and the cantilever component (7) is detachably connected to a plurality of wire pressing plates (73), wherein the wire pressing plates (73) and the cantilever component (7) jointly press the two coil lead wires (21).

5. A superconducting magnet system according to claim 1, characterized in that: The first heat-insulating column (51) and the second heat-insulating column (52) are both hollow tubes, and the peripheral walls of the hollow tubes are provided with through holes (53).

6. A superconducting magnet system according to claim 5, characterized in that: A plurality of through holes (53) are provided, and the through holes (53) are spaced apart along the axial direction of the hollow tube, and adjacent through holes (53) are staggered along the circumferential direction of the hollow tube.

7. A superconducting magnet system according to claim 6, characterized in that: The hollow tube is provided with two node filling columns (54), the node filling columns (54) are interference fit with the hollow tube, the material of the node filling columns (54) is the same as that of the hollow tube, and the two node filling columns (54) are respectively located at two ends of the hollow tube.

8. A superconducting magnet system according to claim 1, characterized in that: The first heat-insulating column (51) and the second heat-insulating column (52) are arranged in a one-to-one correspondence, and the first heat-insulating column (51) and the second heat-insulating column (52) are integrally connected to form a long heat-insulating column (55). The long heat-insulating column (55) passes through the first-level suspended cold plate (41) and is connected to the first-level suspended cold plate (41) in a clearance-fitting manner.

9. A superconducting magnet system according to claim 8, characterized in that: A connecting sleeve (56) is sleeved on the middle part of the long heat-insulating column (55). The connecting sleeve (56) is a metal part. The connecting sleeve (56) is fixedly connected to the long heat-insulating column (55). The connecting sleeve (56) has an external thread (561). The connecting sleeve (56) is threadedly connected to two limit nuts (57). The two limit nuts (57) jointly clamp the primary suspended cold plate (41).

10. A superconducting magnet system according to claim 8, characterized in that: A connecting sleeve (56) is sleeved on the middle part of the long heat-insulating column (55); the connecting sleeve (56) is a metal part and is fixedly connected to the long heat-insulating column (55); the connecting sleeve (56) comprises an external thread section (562) and an optical axis section (563); a step surface is provided between the external thread section (562) and the optical axis section (563); the external thread section (562) is provided with a limiting nut (57); the limiting nut (57) and the step surface jointly clamp the primary suspended cold plate (41).

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