阅读说明：本技术 用于超导磁体的防低温冷缩偏心定位装置 (Low-temperature cold contraction prevention eccentric positioning device for superconducting magnet ) 是由 董瑞学 成渝 朱思华 周杨 张喜虎 马树奎 黄崇津 于 2020-12-16 设计创作，主要内容包括：本发明公开了一种用于超导磁体的防低温冷缩偏心定位装置,包括推动端定位块(1)、浮动端定位块(2)、筒体(3)、推动端端板(41)、浮动端端板(42)和内侧锥块(5)；推动端端板和浮动端端板连筒体,超导磁体外壳两端形成锥体结构(61)；浮动端定位块装在浮动端端板上并通过锥面与锥体结构匹配定位,推动端定位块装在推动端端板上并设有径向碟簧组件(71)；内侧锥块通过弧面和锥面装在推动端定位块和锥体结构间,超导磁体外壳同轴装在筒体内；内侧锥块与推动端定位块间装有轴向碟簧组件(72)。本发明能实现超导磁体常温下精确安装定位,克服因零部件冷缩导致磁场中心与温孔不同心及磁体场型和磁场强度不满足要求的问题。(The invention discloses a low-temperature cold contraction prevention eccentric positioning device for a superconducting magnet, which comprises a pushing end positioning block (1), a floating end positioning block (2), a barrel (3), a pushing end plate (41), a floating end plate (42) and an inner side conical block (5); the push end plate and the floating end plate are connected with the cylinder body, and two ends of the superconducting magnet shell form a cone structure (61); the floating end positioning block is arranged on the floating end plate and is matched and positioned with the cone structure through a conical surface, and the pushing end positioning block is arranged on the pushing end plate and is provided with a radial disc spring assembly (71); the inner side conical block is arranged between the pushing end positioning block and the conical structure through the cambered surface and the conical surface, and the superconducting magnet shell is coaxially arranged in the barrel; an axial disc spring component (72) is arranged between the inner side conical block and the pushing end positioning block. The invention can realize the accurate installation and positioning of the superconducting magnet at normal temperature, and overcome the problems that the center of the magnetic field is not concentric with the temperature hole and the field type and the magnetic field strength of the magnet cannot meet the requirements due to the cold contraction of parts.)

1. A prevent low temperature shrinkage eccentric positioner for superconducting magnet, characterized by: comprises a pushing end positioning block (1), a floating end positioning block (2), a cylinder body (3), a pushing end plate (41), a floating end plate (42) and an inner side cone block (5); the pushing end plate (41) and the floating end plate (42) are respectively arranged at two ends of the cylinder body (3), and cone structures (61) which are narrowed outwards are formed at two ends of the superconducting magnet shell (6); a plurality of block floating end positioning blocks (2) are respectively installed on the floating end plate (42) at intervals, and each block floating end positioning block (2) is provided with a conical surface matched with the cone structure (61), so that the superconducting magnet shell (6) is positioned at the floating end in a matching way through the plurality of block floating end positioning blocks (2); a plurality of pushing end positioning blocks (1) are respectively installed on the pushing end plate (41) at intervals, a radial disc spring assembly (71) is installed between each pushing end positioning block (1) and the inner side conical block (5) in a locking mode, the outer ring of the inner side conical block (5) is provided with a cambered surface matched with the inner side of each pushing end positioning block (1), and the inner cambered surface of each pushing end positioning block (1) is attached to the outer ring cambered surface of the inner side conical block (5); the inner ring of the inner side conical block (5) is provided with a conical surface matched with the conical structure (61), so that a plurality of inner side conical blocks (5) are respectively and correspondingly arranged between a plurality of pushing end positioning blocks (1) and the conical structure (61), the pushing end of the superconducting magnet shell (6) is matched and positioned through the plurality of pushing end positioning blocks (1) and the inner side conical block (5), and the superconducting magnet shell (6) is coaxially arranged in the barrel body (3); an axial disc spring assembly (72) is arranged between the axial end face of each inner side conical block (5) and the pushing end positioning block (1) along the axial direction of the superconducting magnet shell (6).

2. The cold-shrink-prevention eccentric positioning device for a superconducting magnet according to claim 1, wherein: each pushing end positioning block (1) is at least embedded with two groups of radial disc spring assemblies (71) through mounting grooves, and each group of radial disc spring assemblies (71) are arranged along the radial direction of the superconducting magnet shell (6).

3. The low-temperature cold-shrink prevention eccentric positioning device for the superconducting magnet according to claim 1 or 2, wherein: the radial disc spring assembly (71) is embedded in the mounting groove of the pushing end positioning block (1), and the outer side of the radial disc spring assembly (71) is locked through a nut, so that a guide block of the radial disc spring assembly (71) does not protrude out of the inner arc surface of the pushing end positioning block (1).

4. The cold-shrink-prevention eccentric positioning device for a superconducting magnet according to claim 1, wherein: each pushing end positioning block (1) is at least embedded with two groups of axial disc spring assemblies (72) through a guide hole, and each group of axial disc spring assemblies (72) are arranged along the axial direction of the superconducting magnet shell (6).

5. The low-temperature cold-shrink prevention eccentric positioning device for the superconducting magnet according to claim 1 or 4, wherein: the axial disc spring assembly (72) comprises a guide rod and a disc spring arranged on the guide rod, and the axial direction of the disc spring is parallel to the axial direction of the superconducting magnet shell (6); one end of the guide rod is fixedly installed on the surface of the inner side conical block (5), and the other end of the guide rod is inserted into the guide hole of the pushing end positioning block (1).

6. The cold-shrink-prevention eccentric positioning device for a superconducting magnet according to claim 1, wherein: the positioning blocks (1) of the pushing ends are uniformly arranged along the circumferential direction of the outer side wall of the superconducting magnet shell (6), the inner conical blocks (5) are uniformly arranged along the circumferential direction of the outer side wall of the pushing ends of the superconducting magnet shell (6), the inner conical blocks (5) are installed between the superconducting magnet shell (6) and the positioning blocks (1) of the pushing ends at intervals, and the floating end positioning blocks (2) are uniformly arranged along the circumferential direction of the outer side wall of the superconducting magnet shell (6).

Technical Field

The invention relates to superconducting magnet equipment, in particular to a low-temperature cold contraction prevention eccentric positioning device for a superconducting magnet.

Background

With the progress of science and technology and the requirements of special industries, magnets such as complex gyrotron and ion accelerator with larger size, large mass and high precision are researched and manufactured. The high precision is mainly reflected in the coaxiality requirement of the magnetic field center and the warm hole, the coaxiality deviation of the magnetic field center shaft and the magnet inner cylinder is too large (>0.1mm), the electron (ion) beam cannot move according to a preset track, and the output power is seriously influenced.

For the existing frameless magnet which consists of an assembly coil and is wrapped by a hard aluminum pipe with thicker wall thickness, the assembly requirement is very high at normal temperature, the assembly precision is ensured to be unchanged as far as possible at low temperature, the magnet pre-tightening force is required to be exerted by utilizing the thermal shrinkage characteristic of aluminum, the magnet is ensured to be assembled in place, and the stability of the assembled magnet is ensured by the shrinkage at low temperature; the two ends of the magnet are provided with a tensioning end plate and a wiring port. Therefore, the superconducting magnet is positioned with an external positioning part, and the fixing of the superconducting magnet can only be arranged on an external aluminum tube. When the superconducting magnet is assembled at normal temperature, after the superconducting magnet is concentrically adjusted in place and fixed, the concentricity of the magnet and the warm hole can be ensured by means of three coordinates and the like at normal temperature, but the magnet can only be positioned by an external aluminum shell when assembled in the thermostat, and because the shrinkage of the aluminum tube is large at low temperature, the concentricity and the positioning failure of the magnet can be caused by the axial shrinkage and the radial shrinkage of the aluminum tube at low temperature, the requirement on concentricity is met, the performance of the magnet is reduced, and the shearing force of a positioning part is easy to shear.

Under the continuously increasing requirements of the power, size, weight, precision and the like of the magnet, a static magnetic field with higher field strength and higher part processing and assembling precision are required to be equipped. Although under the condition of normal temperature (300K), the assembly precision below 0.1mm can be achieved by controlling the processing precision and combining a three-coordinate or laser tracker, and the coaxiality requirement is met. However, when the temperature of the superconducting magnet is reduced from 300K to 4K, the cold shrinkage deformation of the positioning parts of the superconducting magnet is inevitably caused, so that the concentricity of the magnet is damaged, and even the positioned connecting piece or the welding seam is damaged. Particularly, for a superconducting magnet using a material with a large thermal contraction coefficient (aluminum alloy) as a positioning part, the concentricity of the magnet is seriously affected by the cold shrinkage of the part, so that the superconducting magnet cannot meet the use requirement.

Disclosure of Invention

The invention aims to provide a low-temperature cold-contraction prevention eccentric positioning device for a superconducting magnet, which can realize accurate installation and positioning of the superconducting magnet, overcome the problem that the center of a magnetic field and a temperature hole are not concentric due to cold contraction of parts of the superconducting magnet, avoid the situation that the field pattern and the magnetic field strength of the magnet cannot meet the requirements caused by the problem, and solve the problems of damage of a hard connecting piece and installation failure of the magnet caused by cold contraction of the parts of the magnet.

The invention is realized by the following steps:

a low-temperature cold contraction prevention eccentric positioning device for a superconducting magnet comprises a pushing end positioning block, a floating end positioning block, a barrel, a pushing end plate, a floating end plate and an inner side taper block; the push end plate and the floating end plate are respectively arranged at two ends of the cylinder body, and cone structures which are narrowed outwards are formed at two ends of the superconducting magnet shell; a plurality of block floating end positioning blocks are respectively installed on the floating end plates at intervals, and each block floating end positioning block is provided with a conical surface matched with the cone structure, so that the superconducting magnet shell is positioned at the floating end in a matching way through the plurality of block floating end positioning blocks; a plurality of pushing end positioning blocks are respectively arranged on the pushing end plate at intervals, a radial disc spring assembly is locked and arranged between each pushing end positioning block and the inner side cone block, and the outer ring of the inner side cone block is provided with a cambered surface matched with the inner side of each pushing end positioning block so that the inner cambered surface of each pushing end positioning block is attached to the outer ring cambered surface of the inner side cone block; the inner ring of the inner side conical block is provided with a conical surface matched with the conical structure, so that the inner side conical blocks in the blocks are respectively and correspondingly arranged between the pushing end positioning blocks and the conical structure, and the pushing end of the superconducting magnet shell is matched and positioned with the inner side conical block through the pushing end positioning blocks, so that the superconducting magnet shell is coaxially arranged in the cylinder; an axial disc spring assembly is arranged between the axial end face of each inner side conical block and the pushing end positioning block along the axial direction of the superconducting magnet shell.

And each pushing end positioning block is at least embedded with two groups of radial disc spring assemblies through mounting grooves, and each group of radial disc spring assemblies are arranged along the radial direction of the superconducting magnet shell.

The radial disc spring assemblies are all embedded in the mounting grooves of the pushing end positioning blocks, the outer sides of the radial disc spring assemblies are locked through nuts, and the guide blocks of the radial disc spring assemblies do not protrude out of the inner side cambered surfaces of the pushing end positioning blocks.

Each pushing end positioning block is at least embedded with two groups of axial disc spring assemblies through a guide hole, and each group of axial disc spring assemblies are arranged along the axial direction of the superconducting magnet shell.

The axial disc spring assembly comprises a guide rod and a disc spring arranged on the guide rod, and the axial direction of the disc spring is parallel to the axial direction of the superconducting magnet shell; one end of the guide rod is fixedly installed on the surface of the inner side conical block, and the other end of the guide rod is inserted into the guide hole of the pushing end positioning block.

The plurality of pushing end positioning blocks are uniformly arranged along the circumferential direction of the outer side wall of the superconducting magnet shell, the plurality of inner side cone blocks are uniformly arranged along the circumferential direction of the outer side wall of the pushing end of the superconducting magnet shell, the plurality of inner side cone blocks are installed between the superconducting magnet shell and the pushing end positioning blocks at intervals, and the plurality of floating end positioning blocks are uniformly arranged along the circumferential direction of the outer side wall of the superconducting magnet shell.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention forms cone structures at two ends of the superconducting magnet shell, and the matching conical surfaces formed by the floating end positioning block and the inner side cone block enable the two ends of the superconducting magnet shell to be positioned and installed in a matching way, thereby avoiding the eccentric problem of the magnet caused by the contraction of the aluminum shell and ensuring that the field type and the magnetic field intensity of the magnet formed by the superconducting magnet meet the use requirements.

2. According to the superconducting magnet, one end of the superconducting magnet shell is positioned through the inner side conical block, the axial disc spring assembly is installed, the disc spring axially arranged along the superconducting magnet shell provides pretightening force, the fit degree of the cone structure and the conical surface is further ensured, and the magnet is guaranteed to be concentric under the low-temperature shrinkage state.

3. According to the invention, the radial disc spring assembly is installed while one end of the superconducting magnet shell is reinforced by the pushing end positioning block, and the disc spring arranged along the radial direction of the superconducting magnet shell provides pretightening force, so that the overall height reduction of the superconducting magnet caused by shrinkage can be further avoided, and the pretightening force requirement on the axial disc spring assembly can be reduced to a certain extent.

Drawings

FIG. 1 is an axial cross-sectional view of the low temperature cold-shrink prevention eccentric positioning device for a superconducting magnet of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

fig. 3 is a sectional view taken along line B-B of fig. 1.

In the figure, a pushing end positioning block 1, a floating end positioning block 2, a barrel 3, a pushing end plate 41, a floating end plate 42, an inner side cone block 5, a superconducting magnet shell 6, a cone 61 structure, a radial disc spring assembly 71, an axial disc spring assembly 72 and a nut 8 are arranged.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

Referring to fig. 1 to 3, a low-temperature cold contraction prevention eccentric positioning device for a superconducting magnet includes a push end positioning block 1, a floating end positioning block 2, a cylinder 3, a push end plate 41, a floating end plate 42 and an inner side taper block 5; the pushing end plate 41 and the floating end plate 42 are respectively installed at two ends of the cylinder 3, and cone structures 61 which are narrowed outwards are formed at two ends of the aluminum superconducting magnet shell 6; a plurality of block floating end positioning blocks 2 are respectively installed on the floating end plate 42 at intervals, and a conical surface matched with the cone structure 61 is formed on each block floating end positioning block 2, so that the superconducting magnet shell 6 is positioned at the floating end in a matching way through the block floating end positioning blocks 2; a plurality of pushing end positioning blocks 1 are respectively installed on the pushing end plate 41 at intervals, a radial disc spring assembly 71 is locked and installed between each pushing end positioning block 1 and the inner side conical block 5, the radial disc spring assembly 71 is locked through nuts, enough pre-tightening force is given to the superconducting magnet shell 6, an outer ring of the inner side conical block 5 is provided with a cambered surface matched with the inner side of each pushing end positioning block 1, the inner cambered surface of each pushing end positioning block 1 is ensured to be attached to the outer ring cambered surface of the inner side conical block 5, and the nuts are loosened after the superconducting magnet shell 6 is installed; the inner ring of the inner side conical block 5 is formed with a conical surface matched with the conical structure 61, so that a plurality of inner side conical blocks 5 are respectively and correspondingly arranged between a plurality of pushing end positioning blocks 1 and the conical structure 61, and the pushing end of the superconducting magnet shell 6 is matched and positioned through the plurality of pushing end positioning blocks 1 and the inner side conical blocks 5, so that the superconducting magnet shell 6 is coaxially arranged in the barrel 3; an axial disc spring assembly 72 is arranged between the axial end face of each inner side conical block 5 and the pushing end positioning block 1 along the axial direction of the superconducting magnet shell 6, so that sufficient axial pre-tightening force is given to the superconducting magnet shell 6. Both ends of the superconducting magnet shell 6 are positioned in a matched manner through conical surfaces, and the pre-tightening force provided by the radial disc spring assembly 71 and the axial disc spring assembly 72 at the pushing end of the superconducting magnet shell 6 is combined to ensure the fitting degree of the conical surfaces, so that the self-adaptive positioning when the height is reduced due to the radial contraction of the superconducting magnet shell 6 is realized. The conical taper of the cone structure 61, the floating end positioning block 2 and the inner side cone block 5 can be determined according to the adopted materials, the expansion coefficient of the materials and the like, and the conical taper is finished through finish machining.

Each pushing end positioning block 1 is at least embedded with two groups of radial disc spring assemblies 71 through mounting grooves (not shown in the figure), and each group of radial disc spring assemblies 71 are arranged along the radial direction of the superconducting magnet shell 6. Radial pretightening force is provided for the pushing end positioning block 1 through the radial disc spring assembly 71, so that the fitting degree between the cone structures 61 at the two ends of the superconducting magnet shell 6 and the two conical surfaces is ensured, and the problem of overall magnet descending caused by contraction of the superconducting magnet shell 6 is solved.

The radial disc spring assembly 71 comprises a disc spring, a ball pad and a guide block; the radial disc spring assembly 71 is embedded in the mounting groove of the pushing end positioning block 1 in a matching mode, the outer side of the radial disc spring assembly 71 is locked through a nut, the guide block does not protrude out of the inner arc surface of the pushing end positioning block 1, the ball pad is used for finely adjusting the central axis of the guide block, the central axis of the guide block passes through the center of the superconducting magnet shell 6, and therefore the disc spring can provide enough pretightening force for the superconducting magnet shell 6. The radial stability of the superconducting magnet shell 6 is guaranteed through the radial butterfly springs (disc springs), and the stress of the axial disc spring assembly 72 can be dispersed to a certain extent, so that the requirement on the disc spring pre-tightening force of the axial disc spring assembly 71 is reduced.

At least two sets of axial disc spring assemblies 72 are embedded in each pushing end positioning block 1 through a guide hole (not shown in the figure), and each set of axial disc spring assembly 72 is arranged along the axial direction of the superconducting magnet shell 6. Axial pretightening force is provided for the pushing end positioning block 1 through the axial disc spring assembly 72, and the cone structure 61 can be reliably attached to the two conical surfaces in an accurate fit manner due to the axial and radial matching, so that the problem of overall descending of the magnet caused by contraction of the superconducting magnet shell 6 is solved.

The axial disc spring assembly 72 comprises a guide rod and a disc spring arranged on the guide rod, and the axial direction of the disc spring is parallel to the axial direction of the superconducting magnet shell 6; one end of the guide rod is fixedly installed on the surface of the inner side conical block 5, and the other end of the guide rod is inserted into the guide hole of the push end positioning block 1. The stable assembly of the inner side conical block 5, the pushing end positioning block 1 and the superconducting magnet shell 6 is realized, and the axial stability of the superconducting magnet shell 6 is guaranteed through the axially arranged belleville springs (disc springs).

The plurality of push end positioning blocks 1 are uniformly arranged along the circumferential direction of the outer side wall of the superconducting magnet shell 6, the plurality of inner side conical blocks 5 are uniformly arranged along the circumferential direction of the outer side wall of the push end of the superconducting magnet shell 6, the plurality of inner side conical blocks 5 are installed between the superconducting magnet shell 6 and the push end positioning blocks 1 at intervals, and the plurality of floating end positioning blocks 2 are uniformly arranged along the circumferential direction of the outer side wall of the superconducting magnet shell 6. The supporting force of the pushing end positioning block 1, the floating end positioning block 2 and the inner side taper block 5 on the end part of the superconducting magnet shell 6 is ensured to be more uniform and stable, and the concentricity of the superconducting magnet shell 6 is favorably maintained.

After the normal temperature is concentric, the temperature is reduced to 4.2k, the contraction of the aluminum superconducting magnet shell 6 is large, and the conical surface structures 61 at the two ends of the superconducting magnet shell 6 are matched with the conical surface of the floating end positioning block 2 and the inner ring cambered surface of the inner side conical block 5 through the pretightening force of the radial disc spring assembly 71 and the axial disc spring assembly 72, so that the superconducting magnet shell 6 is prevented from being eccentric.

The number of the pushing end positioning blocks 1, the floating end positioning blocks 2 and the inner side conical blocks 5 is determined according to the weight and the size of the superconducting magnet. Preferably, three pushing end positioning blocks 1, three floating end positioning blocks 2 and three inner side conical blocks 5 are arranged.

The assembly process of the low-temperature cold-contraction prevention eccentric positioning device for the superconducting magnet comprises the following steps:

1. the pushing end plate 41 is horizontally fixed, the pushing end plate 41 is of a circular plate-shaped structure matched with the barrel 3, three pushing end positioning blocks 1 are circumferentially installed on the pushing end plate 41 and are welded and fixed, and the three pushing end positioning blocks 1 are arranged at 120-degree intervals.

2. The radial disc spring assemblies 71 of the pushing end positioning blocks 1 are installed, and installation holes are formed in two ends of each pushing end positioning block 1 and used for installing two groups of radial disc spring assemblies 71. The radial disc spring assemblies 71 comprise disc springs radially arranged along the superconducting magnet shell 6, ball pads used for mounting the disc springs and guide blocks used for positioning the radial disc spring assemblies 71, each radial disc spring assembly 71 is tightened by a nut 8, and the inner ring surface of the guide block, which does not protrude out of the positioning block 1 of the pushing end, is ensured.

3. Three inner conical blocks 5 and axial disc spring assemblies 72 thereof are mounted, the number of the axial disc spring assemblies 72 can be determined according to the weight of the superconducting magnet shell 6, and each axial disc spring assembly 72 comprises a disc spring and a guide rod; two guide rods are welded on the end face of the inner side conical block 5 and used for installing butterfly springs, the butterfly springs are arranged along the axial direction of the superconducting magnet shell 6, two guide holes are formed in the pushing end positioning block 1, and the guide rods are correspondingly inserted into the guide holes. The cambered surfaces of the three inner side conical blocks 5 are respectively and correspondingly attached to the three pushing end positioning blocks 1 one by one, and the conical surfaces of the three inner side conical blocks 5 are respectively and circumferentially attached to the surface of a conical structure 61 of the pushing end of the superconducting magnet shell 6. And finishing the assembly of the positioning structure of the pushing end.

4. One end of the superconducting magnet shell 6 is inserted into a positioning structure of a pushing end of the eccentricity-preventing positioning device, so that the pushing end of the superconducting magnet shell 6 is positioned in a matching mode through a plurality of pushing end positioning blocks 1. And loosening the nut 8 for tensioning the radial disc spring assembly 71 to enable the superconducting magnet shell 6 to be tightly pressed on the disc spring of the radial disc spring assembly 71, and ensuring that the height change of the superconducting magnet shell 6 after cold contraction is smaller in the radial direction under the action of the pretightening force of the disc spring of the radial disc spring assembly 71.

5. The superconducting magnet shell 6 and the pushing end of the anti-eccentricity positioning device are inserted into the barrel 3, and the pushing end plate 41 is welded and fixed on the pushing end of the barrel 3.

6. Three floating end positioning blocks 2 are mounted on the floating end plate 42 and welded and reinforced, the three floating end positioning blocks 2 are arranged at equal intervals of 120 degrees, 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 and circumferentially attached to the surface of the cone structure 61 of the floating end of the superconducting magnet shell 6, so that the floating end of the superconducting magnet shell 6 is matched and positioned through the plurality of floating end positioning blocks 2, the conical surfaces are guaranteed to be matched and pressed with the cone structure 61, and finally the floating end plate 42 is welded and fixed on the floating end of the cylinder 3. I.e. the concentric mounting of the superconducting magnet is completed.

The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.