Eccentric positioning device for preventing low temperature shrinkage of superconducting magnets

Abstract

The invention discloses an eccentric positioning device for preventing low temperature shrinkage of a superconducting magnet, comprising a push end positioning block (1), a floating end positioning block (2), a cylinder (3), a push end end plate (41), a floating end end plate (42) and an inner cone block (5); the push end end plate and the floating end end plate are connected to the cylinder, and a cone structure (61) is formed at both ends of the superconducting magnet shell; the floating end positioning block is mounted on the floating end end plate and is positioned by matching the cone structure through a cone surface, the push end positioning block is mounted on the push end end plate and is provided with a radial disc spring assembly (71); the inner cone block is mounted between the push end positioning block and the cone structure through an arc surface and a cone surface, and the superconducting magnet shell is coaxially mounted in the cylinder; an axial disc spring assembly (72) is installed between the inner cone block and the push end positioning block. The invention can realize accurate installation and positioning of the superconducting magnet at room temperature, and overcome the problem that the magnetic field center is not concentric with the warm hole due to the shrinkage of parts and components, and the magnetic field type and magnetic field strength do not meet the requirements.

Description

Technical Field

[0001] The invention relates to a superconducting magnet device, in particular to an eccentric positioning device for preventing low-temperature shrinkage of a superconducting magnet. Background Art

[0002] With the advancement of science and technology and the needs of special industries, more and more large-scale, high-mass, high-precision complex gyrotrons, ion accelerators and other magnets are being studied and manufactured. High precision is mainly reflected in the coaxiality requirements between the magnetic field center and the warm hole. If the coaxiality deviation between the magnetic field center axis and the inner cylinder of the magnet is too large (>0.1mm), the electron (ion) beam will not be able to move according to the predetermined trajectory, which will seriously affect the output power.

[0003] The existing frameless magnets are composed of assembly coils, and the outside is wrapped by a thick-walled hard aluminum tube. It is necessary to meet very high assembly requirements at room temperature and ensure that the assembly accuracy remains unchanged as much as possible at low temperature. It is necessary to use the thermal shrinkage characteristics of aluminum to pre-tighten the magnet to ensure that the magnet is assembled in place, and at the same time, shrink at low temperature to ensure the stability of the assembled magnet; there are tensioning end plates and wiring ports at both ends of the magnet. Therefore, the superconducting magnet is positioned with external positioning parts, and its fixation can only be placed on the external aluminum tube. When assembled at room temperature, after the superconducting magnet is adjusted and fixed in place, the concentricity of the magnet and the temperature hole can be ensured by means such as three-coordinate measurement at room temperature, but the magnet can only be positioned by the external aluminum shell when assembled into the thermostat. Since the aluminum tube shrinks a lot at low temperature, the axial and radial contraction of the aluminum tube at low temperature will cause the magnet to lose concentricity, positioning failure, and fail to meet the concentricity requirements, reducing the performance of the magnet, and the shear force of the positioning parts is easy to be sheared off.

[0004] With the increasing requirements for the power, size, weight, and precision of magnets, it is necessary to equip them with higher-strength static magnetic fields and higher precision in the processing and assembly of parts. Although at room temperature (300K), by controlling the processing precision and combining three-coordinate or laser trackers, the assembly precision of less than 0.1mm can be achieved to meet the coaxiality requirements. However, in the process of the superconducting magnet temperature dropping from 300K to 4K, it will inevitably cause the cold shrinkage deformation of its positioning parts, thereby destroying the concentricity of the magnet and even the positioning connectors or welds. In particular, for superconducting magnets that use materials with large thermal shrinkage coefficients (aluminum alloys) as positioning parts, the concentricity of the magnet is severely affected by the cold shrinkage of the parts, resulting in the superconducting magnet being unable to meet the use requirements. Summary of the invention

[0005] The purpose of the present invention is to provide an eccentric positioning device for superconducting magnets to prevent low-temperature shrinkage, which can realize the precise installation and positioning of the superconducting magnets, overcome the problem of the magnetic field center and the warm hole being not concentric due to the shrinkage of the components of the superconducting magnets, and avoid the situation where the magnet field type and magnetic field strength do not meet the requirements caused by the above problem, and also solve the problem of hard connection damage and magnet installation failure caused by the shrinkage of magnet components.

[0006] The present invention is achieved in that:

[0007] A low-temperature shrinkage-proof eccentric positioning device for superconducting magnets, comprising a push-end positioning block, a floating-end positioning block, a cylinder, a push-end end plate, a floating-end end plate and an inner cone block; the push-end end plate and the floating-end end plate are respectively mounted on the two ends of the cylinder, and the two ends of the superconducting magnet shell are formed with a cone structure narrowing outward; a plurality of floating-end positioning blocks are respectively mounted on the floating-end end plate at intervals, and each floating-end positioning block is formed with a cone surface matching the cone structure, so that the superconducting magnet shell is matched and positioned at the floating end through the plurality of floating-end positioning blocks; a plurality of push-end positioning blocks are respectively mounted on the push-end end plate at intervals, and each push-end positioning block is aligned with the inner cone block. A radial disc spring assembly is locked and installed between the cone blocks, and an outer ring of the inner cone block is formed with an arc surface matching the inner side of the push-end positioning block, so that the inner arc surface of the push-end positioning block fits with the outer ring arc surface of the inner cone block; an inner ring of the inner cone block is formed with a cone surface matching the cone structure, so that a number of inner cone blocks are respectively installed between a number of push-end positioning blocks and the cone structure, so that the push end of the superconducting magnet housing is matched and positioned by a number of push-end positioning blocks and the inner cone blocks, so that the superconducting magnet housing is coaxially installed in the cylinder; an axial disc spring assembly is installed between the axial end face of each inner cone block and the push-end positioning block along the axial direction of the superconducting magnet housing.

[0008] At least two groups of radial disc spring components are embedded in each push-end positioning block through the mounting groove, and each group of radial disc spring components is arranged along the radial direction of the superconducting magnet shell.

[0009] The radial disc spring assemblies are all embedded in the mounting grooves of the push end positioning block, and the outer sides of the radial disc spring assemblies are locked by nuts so that the guide blocks of the radial disc spring assemblies do not protrude from the inner arc surface of the push end positioning block.

[0010] At least two groups of axial disc spring components are embedded in each push-end positioning block through a guide hole, and each group of axial disc spring components is arranged along the axial direction of the superconducting magnet housing.

[0011] The axial disc spring assembly includes a guide rod and a disc spring installed on the guide rod, and the axial direction of the disc spring is parallel to the axial direction of the superconducting magnet housing; one end of the guide rod is fixedly installed on the surface of the inner cone block, and the other end of the guide rod is inserted into the guide hole of the pushing end positioning block.

[0012] The plurality of pushing end positioning blocks are evenly arranged along the circumference of the outer wall of the superconducting magnet housing, and the plurality of inner cone blocks are evenly arranged along the circumference of the outer wall of the pushing end of the superconducting magnet housing, so that the plurality of inner cone blocks are installed at intervals between the superconducting magnet housing and the pushing end positioning blocks, and the plurality of floating end positioning blocks are evenly arranged along the circumference of the outer wall of the superconducting magnet housing.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention forms a cone structure at both ends of the superconducting magnet housing, and through the matching cone surface formed by the floating end positioning block and the inner cone block, the two ends of the superconducting magnet housing can be matched, positioned and installed, avoiding the problem of magnet eccentricity caused by the shrinkage of the aluminum housing, and ensuring that the magnet field type and magnetic field strength formed by the superconducting magnet meet the use requirements.

[0015] 2. The present invention installs an axial disc spring assembly while positioning one end of the superconducting magnet housing through the inner cone block. The disc spring arranged along the axial direction of the superconducting magnet housing provides a preload force to further ensure the fit between the cone structure and the cone surface, thereby ensuring that the magnet remains concentric in the low-temperature contraction state.

[0016] 3. In the present invention, a radial disc spring assembly is installed while reinforcing one end of the superconducting magnet housing by pushing an end positioning block. The preload force is provided by a butterfly spring arranged radially along the superconducting magnet housing, which can further avoid the overall height reduction of the superconducting magnet due to contraction and reduce the preload force requirement for the axial disc spring assembly to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an axial cross-sectional view of the eccentric positioning device for preventing low-temperature shrinkage of superconducting magnets according to the present invention;

[0018] Figure 2 yes Figure 1 AA cross-section diagram;

[0019] Figure 3 yes Figure 1 BB cross-section diagram.

[0020] In the figure, 1 is a pushing end positioning block, 2 is a floating end positioning block, 3 is a cylinder, 41 is a pushing end end plate, 42 is a floating end end plate, 5 is an inner cone block, 6 is a superconducting magnet housing, 61 is a cone structure, 71 is a radial disc spring assembly, 72 is an axial disc spring assembly, and 8 is a nut. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] Please see attached Figure 1To Attachment Figure 3 , an anti-low-temperature shrinkage eccentric positioning device for a superconducting magnet, comprising a pushing end positioning block 1, a floating end positioning block 2, a cylinder 3, a pushing end end plate 41, a floating end end plate 42 and an inner cone block 5; the pushing end end plate 41 and the floating end end plate 42 are respectively installed at the two ends of the cylinder 3, and the two ends of the aluminum superconducting magnet shell 6 are formed with an outwardly narrowed cone structure 61; a plurality of floating end positioning blocks 2 are respectively installed on the floating end end plate 42 at intervals, and each floating end positioning block 2 is formed with a cone surface matching the cone structure 61, so that the superconducting magnet shell 6 is matched and positioned at the floating end through the plurality of floating end positioning blocks 2; a plurality of pushing end positioning blocks 1 are respectively installed on the pushing end end plate 41 at intervals, and a radial disc spring assembly 71 is locked and installed between each pushing end positioning block 1 and the inner cone block 5, and the radial disc spring assembly is locked by a nut Part 71, giving sufficient pre-tightening force to the superconducting magnet housing 6, the outer ring of the inner cone block 5 is formed with an arc surface matching the inner side of the pushing end positioning block 1, ensuring that the inner arc surface of the pushing end positioning block 1 fits with the outer ring arc surface of the inner cone block 5, and the nut is loosened after the installation of the superconducting magnet housing 6 is completed; the inner ring of the inner cone block 5 is formed with a conical surface matching the cone structure 61, so that several inner cone blocks 5 are respectively installed between several pushing end positioning blocks 1 and the cone structure 61, so that the pushing end of the superconducting magnet housing 6 is matched and positioned by several pushing end positioning blocks 1 and the inner cone block 5, so that the superconducting magnet housing 6 is coaxially installed in the cylinder 3; an axial disc spring assembly 72 is installed along the axial direction of the superconducting magnet housing 6 between the axial end face of each inner cone block 5 and the pushing end positioning block 1, thereby giving the superconducting magnet housing 6 sufficient axial pre-tightening force. Both ends of the superconducting magnet housing 6 are positioned by the conical surface, and combined with the preload provided by the radial disc spring assembly 71 and the axial disc spring assembly 72 at the pushing end of the superconducting magnet housing 6, the fit of the conical surface is ensured, and adaptive positioning is achieved when the height of the superconducting magnet housing 6 decreases due to radial contraction. The conical surface taper of the conical structure 61, the floating end positioning block 2, and the inner conical block 5 can be determined according to the material used, the expansion coefficient of the material, etc., and completed by fine machining.

[0023] At least two sets of radial disc spring assemblies 71 are embedded in each push-end positioning block 1 through a mounting groove (not shown in the figure), and each set of radial disc spring assemblies 71 is arranged along the radial direction of the superconducting magnet housing 6. The radial disc spring assemblies 71 provide radial pre-tightening force for the push-end positioning block 1 to ensure the fit between the cone structure 61 at both ends of the superconducting magnet housing 6 and the two cone surfaces, thereby alleviating the problem of the overall drop of the magnet caused by the contraction of the superconducting magnet housing 6.

[0024] The radial disc spring assembly 71 includes a disc spring, a ball pad and a guide block; the radial disc spring assembly 71 is matched and embedded in the installation groove of the push end positioning block 1, and the outer side of the radial disc spring assembly 71 is locked by a nut so that the guide block does not protrude from the inner arc surface of the push end positioning block 1. The ball pad is used to fine-tune the central axis of the guide block so that it passes through the center of the superconducting magnet housing 6, so that the disc spring gives the superconducting magnet housing 6 sufficient preload force. The radially arranged butterfly spring (disc spring) provides a guarantee for the radial stability of the superconducting magnet housing 6, and can also disperse the force of the axial disc spring assembly 72 to a certain extent, thereby reducing the requirement for the disc spring preload force of the axial disc spring assembly 71.

[0025] At least two groups of axial disc spring assemblies 72 are embedded in each push-end positioning block 1 through a guide hole (not shown in the figure), and each group of axial disc spring assemblies 72 is arranged along the axial direction of the superconducting magnet housing 6. The axial disc spring assemblies 72 provide an axial preload force for the push-end positioning block 1, and the axial and radial coordination can reliably ensure the precise fit between the cone structure 61 and the two cone surfaces, thereby solving the problem of the overall drop of the magnet due to the contraction of the superconducting magnet housing 6.

[0026] The axial disc spring assembly 72 includes a guide rod and a disc spring mounted on the guide rod, and the axial direction of the disc spring is parallel to the axial direction of the superconducting magnet housing 6; one end of the guide rod is fixedly mounted on the surface of the inner cone block 5, and the other end of the guide rod is inserted into the guide hole of the push end positioning block 1. This not only realizes the stable assembly of the inner cone block 5, the push end positioning block 1 and the superconducting magnet housing 6, but also provides a guarantee for the axial stability of the superconducting magnet housing 6 through the axially arranged disc spring (disc spring).

[0027] The plurality of push-end positioning blocks 1 are evenly arranged along the circumference of the outer wall of the superconducting magnet housing 6, and the plurality of inner cone blocks 5 are evenly arranged along the circumference of the outer wall of the push end of the superconducting magnet housing 6, so that the plurality of inner cone blocks 5 are installed between the superconducting magnet housing 6 and the push-end positioning blocks 1 at intervals, and the plurality of floating end positioning blocks 2 are evenly arranged along the circumference of the outer wall of the superconducting magnet housing 6. It is ensured that the support force of the push-end positioning block 1, the floating end positioning block 2 and the inner cone block 5 on the end of the superconducting magnet housing 6 is more uniform and stable, which is conducive to maintaining the concentricity of the superconducting magnet housing 6.

[0028] After concentricity at room temperature, the temperature drops to 4.2K, and the aluminum superconducting magnet housing 6 shrinks significantly. The pre-tightening force of the radial disc spring assembly 71 and the axial disc spring assembly 72 ensures that the conical surface structure 61 at both ends of the superconducting magnet housing 6 cooperates with the conical surface of the floating end positioning block 2 and the inner annular arc surface of the inner cone block 5, thereby preventing the superconducting magnet housing 6 from being eccentric.

[0029] The number of the push end positioning block 1, the floating end positioning block 2 and the inner cone block 5 is determined according to the weight and size of the superconducting magnet. Preferably, three push end positioning blocks 1, three floating end positioning blocks 2 and three inner cone blocks 5 are provided.

[0030] The assembly process of the eccentric positioning device for preventing low temperature shrinkage of superconducting magnets of the present invention is as follows:

[0031] 1. The push end plate 41 is fixed horizontally. The push end plate 41 is a circular plate structure matching the cylinder 3. Three push end positioning blocks 1 are installed circumferentially on the push end plate 41 and fixed by welding. The three push end positioning blocks 1 are arranged at equal intervals of 120°.

[0032] 2. Install the radial disc spring assembly 71 of the push end positioning block 1. Both ends of each push end positioning block 1 are provided with mounting holes for installing two sets of radial disc spring assemblies 71. The radial disc spring assembly 71 includes disc springs arranged along the radial direction of the superconducting magnet housing 6, ball pads for installing the disc springs, and guide blocks for positioning the radial disc spring assembly 71. Each set of radial disc spring assemblies 71 is tightened with a nut 8 to ensure that the guide block does not protrude from the inner annular surface of the push end positioning block 1.

[0033] 3. Install three inner cone blocks 5 and their axial disc spring assemblies 72. The number of axial disc spring assemblies 72 can be determined according to the weight of the superconducting magnet housing 6. The axial disc spring assembly 72 includes a disc spring and a guide rod. Two guide rods are welded to the end surface of the inner cone block 5. The guide rods are used to install the disc spring so that the disc spring is arranged along the axial direction of the superconducting magnet housing 6. There are two guide holes on the push end positioning block 1. The guide rods are inserted into the guide holes accordingly. The arc surfaces of the three inner cone blocks 5 are respectively fitted with the three push end positioning blocks 1 one by one, and the conical surfaces of the three inner cone blocks 5 are respectively circumferentially fitted on the surface of the cone structure 61 of the push end of the superconducting magnet housing 6. The assembly of the positioning structure of the push end is completed.

[0034] 4. Insert one end of the superconducting magnet housing 6 into the positioning structure of the push end of the anti-eccentric positioning device, so that the push end of the superconducting magnet housing 6 is matched and positioned through a plurality of push end positioning blocks 1. Loosen the nut 8 used to tighten the radial disc spring assembly 71, so that the superconducting magnet housing 6 is pressed against the disc spring of the radial disc spring assembly 71. Under the pre-tightening force of the disc spring of the radial disc spring assembly 71, ensure that the height change of the superconducting magnet housing 6 in the radial direction after cold shrinkage is small.

[0035] 5. Insert the superconducting magnet housing 6 and the pushing end of the anti-eccentricity positioning device into the cylinder 3 , and weld and fix the pushing end plate 41 to the pushing end of the cylinder 3 .

[0036] 6. Install three floating end positioning blocks 2 on the floating end end plate 42 and weld them for reinforcement. The three floating end positioning blocks 2 are evenly spaced at 120°, and the floating end positioning blocks 2 are inserted into the floating end of the cylinder 3. The conical surfaces of the three floating end positioning blocks 2 are respectively circumferentially attached to the surface of the conical structure 61 of the floating end of the superconducting magnet housing 6, so that the floating end of the superconducting magnet housing 6 is matched and positioned by a plurality of floating end positioning blocks 2, thereby ensuring the matching and pressing of the conical surface and the conical structure 61. Finally, the floating end end plate 42 is welded and fixed to the floating end of the cylinder 3. The concentric installation of the superconducting magnet is completed.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An eccentric positioning device for preventing low temperature shrinkage of superconducting magnets, characterized by: The invention comprises a push end positioning block (1), a floating end positioning block (2), a cylinder (3), a push end end plate (41), a floating end end plate (42) and an inner cone block (5); the push end end plate (41) and the floating end end plate (42) are respectively mounted on the two ends of the cylinder (3); and the two ends of the superconducting magnet housing (6) are formed with cone structures (61) that narrow outward; a plurality of floating end positioning blocks (2) are respectively mounted on the floating end end plate (42) at intervals, and each floating end positioning block (2) is formed with a cone surface that matches the cone structure (61), so that the superconducting magnet housing (6) is matched and positioned at the floating end by the plurality of floating end positioning blocks (2); a plurality of push end positioning blocks (1) are respectively mounted on the push end end plate (41) at intervals, and each push end positioning block (1) is locked with the inner cone block (5). A radial disc spring assembly (71) is tightly installed, and the outer ring of the inner cone block (5) is formed with an arc surface that matches the inner side of the push end positioning block (1), so that the inner side arc surface of the push end positioning block (1) fits with the outer ring arc surface of the inner cone block (5); the inner ring of the inner cone block (5) is formed with a cone surface that matches the cone structure (61), so that a plurality of inner cone blocks (5) are respectively installed between a plurality of push end positioning blocks (1) and the cone structure (61), so that the push end of the superconducting magnet housing (6) is matched and positioned by the plurality of push end positioning blocks (1) and the inner cone block (5), so that the superconducting magnet housing (6) is coaxially installed in the cylinder (3); an axial disc spring assembly (72) is installed between the axial end surface of each inner cone block (5) and the push end positioning block (1) along the axial direction of the superconducting magnet housing (6).

2. The eccentric positioning device for preventing low temperature shrinkage of superconducting magnets according to claim 1 is characterized in that: At least two groups of radial disc spring components (71) are embedded in each push-end positioning block (1) through a mounting groove, and each group of radial disc spring components (71) is arranged along the radial direction of the superconducting magnet housing (6).

3. The eccentric positioning device for preventing low temperature shrinkage of superconducting magnets according to claim 1 or 2, characterized in that: The radial disc spring assembly (71) is embedded in the installation groove of the push end positioning block (1), and the outer side of the radial disc spring assembly (71) is locked by a nut so that the guide block of the radial disc spring assembly (71) does not protrude from the inner arc surface of the push end positioning block (1).

4. The eccentric positioning device for preventing low temperature shrinkage of superconducting magnets according to claim 1 is characterized in that: At least two groups of axial disc spring assemblies (72) are embedded in each push-end positioning block (1) through a guide hole, and each group of axial disc spring assemblies (72) is arranged along the axial direction of the superconducting magnet housing (6).

5. The eccentric positioning device for preventing low temperature shrinkage of superconducting magnets according to claim 1 or 4, characterized in that: The axial disc spring assembly (72) comprises a guide rod and a disc spring mounted on the guide rod, wherein the axial direction of the disc spring is parallel to the axial direction of the superconducting magnet housing (6); one end of the guide rod is fixedly mounted on the surface of the inner cone block (5), and the other end of the guide rod is inserted into the guide hole of the push end positioning block (1).

6. The eccentric positioning device for preventing low temperature shrinkage of superconducting magnets according to claim 1 is characterized in that: The plurality of push-end positioning blocks (1) are evenly arranged along the circumference of the outer wall of the superconducting magnet housing (6), and the plurality of inner cone blocks (5) are evenly arranged along the circumference of the outer wall of the push end of the superconducting magnet housing (6), so that the plurality of inner cone blocks (5) are installed at intervals between the superconducting magnet housing (6) and the push-end positioning blocks (1), and the plurality of floating end positioning blocks (2) are evenly arranged along the circumference of the outer wall of the superconducting magnet housing (6).

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