Three-dimensional pull rod device with single-degree-of-freedom adjustment and use method

Abstract

The invention discloses a single-degree-of-freedom adjustment three-dimensional pull rod device and a use method, in the three-dimensional pull rod device, a second 300K pull rod seat and a first 300K pull rod seat are connected through a carbon fiber shaft capable of axially moving, and axial degree-of-freedom adjustment of a superconducting coil is realized. And the first 300K pull rod seat and the second 300K pull rod seat are connected through a radial adjusting bolt, so that the degree of freedom adjustment of the superconducting coil in the horizontal direction is realized. The carbon fiber pull rod is connected with the first 300K pull rod seat and the first low-temperature end pull rod seat through bolts, and meanwhile heat leakage is reduced through connection of the heat sink and the cold shield. And the second low-temperature end pull rod seat is fixedly connected with the coil framework and is in spherical contact with the first low-temperature end pull rod seat to increase thermal resistance. And the first low-temperature end pull rod seat and the second low-temperature end pull rod seat are connected through a radial adjusting bolt to realize the degree-of-freedom adjustment of the superconducting coil in the horizontal direction. Cold-state multi-degree-of-freedom adjustment of the position of the superconducting magnet coil can be achieved, and it is ensured that the position is accurate and the pull rod is stressed evenly.

Description

Technical Field

[0001] The present invention belongs to the technical field of superconducting magnets, and particularly relates to a three-dimensional tie rod device with single-degree-of-freedom adjustment and a usage method thereof. Background Art

[0002] Currently, thanks to the continuous progress of superconducting material manufacturing technology, superconducting magnets have been commercially applied on a large scale. A superconducting magnet mainly consists of key components such as a magnet body, a thermal radiation shielding layer, and a vacuum vessel. The connection between these components mainly relies on a tie rod structure. In a superconducting magnet system, as the main load-bearing structure, the tie rod mainly bears the gravity of the cold mass, the stress generated by cold shrinkage, and the pre-tightening force applied during the installation process.

[0003] In the actual assembly process, due to inevitable assembly errors, uneven load distribution may occur. Therefore, it is necessary to finely adjust the position of the magnet after the magnet assembly is completed to ensure that each tie rod is evenly stressed. For a horizontal-axis superconducting magnet system, a three-dimensional tie rod structure can achieve multi-directional load-bearing in the axial, radial, and normal directions, while reducing the number of tie rods to reduce the heat leakage of the system. However, in a low-temperature environment, the direct adjustment function of the three-dimensional tie rod is limited, and precise positioning of the magnet in a single direction cannot be achieved, which makes the process of adjusting the relative position of the magnet time-consuming and complex. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a three-dimensional tie rod device with single-degree-of-freedom adjustment and a usage method thereof, which can achieve single-degree-of-freedom adjustment of a single three-dimensional tie rod of a superconducting magnet in a low-temperature state, thereby precisely controlling the position of the magnet and making the force on each tie rod more balanced. In the magnet transportation state, it can provide buffering and keep the tie rod group in a state of mechanical equilibrium, avoiding tie rod fracture accidents.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A three-dimensional tie rod device with single-degree-of-freedom adjustment includes a first 300K tie rod seat; a second 300K tie rod seat; a 300K-end axial adjustment bolt; a 300K-end radial adjustment bolt; an upper carbon fiber shaft; a spring; a gasket; an upper adjustment nut; a ball pad; a bellows; a seal sleeve; a carbon fiber tie rod; a heat sink; a first low-temperature-end tie rod seat; a second low-temperature-end tie rod seat; a low-temperature-end radial adjustment bolt; a lower carbon fiber shaft; a lower cover plate; a lower adjustment nut; a threaded sleeve;

[0007] The second 300K tie rod seat is connected to the vacuum vessel. A bellows is welded to the lower end face of the second 300K tie rod seat. The bellows is welded to the seal sleeve, and the seal sleeve is adhesively bonded to the carbon fiber tie rod;

[0008] The first 300K pull rod seat is internally processed with a guide groove, and a thread is processed above the guide groove and a 300K end axial adjustment bolt is installed; an upper carbon fiber shaft, a spring, and a gasket are installed inside the guide groove. A spring is installed above the upper carbon fiber shaft, and a gasket is installed above the spring. The upper carbon fiber shaft can reciprocate axially along the guide groove. The first 300K pull rod seat is connected to the second 300K pull rod seat;

[0009] A threaded sleeve is fixedly connected to the upper end of the carbon fiber pull rod; a threaded sleeve is fixedly connected to the lower end of the carbon fiber pull rod. The threaded sleeve is bolted to the first low-temperature end pull rod seat, and the first low-temperature end pull rod seat is connected to the second low-temperature end pull rod seat. The second low-temperature end pull rod seat is bolted to the superconducting magnet skeleton. A lower carbon fiber shaft is installed between the first low-temperature end pull rod seat and the lower end cover plate. A spherical protrusion is processed on the end face of the lower carbon fiber shaft and is in point contact with the second low-temperature end pull rod seat.

[0010] A usage method of a three-dimensional pull rod device with single-degree-of-freedom adjustment, applicable to the above three-dimensional pull rod device with single-degree-of-freedom adjustment, includes:

[0011] Step 1: Adjust the 300K end axial adjustment bolt so that the screwing length between it and the second 300K pull rod seat is adjusted to be the same; adjust the 300K end radial adjustment bolt to make the second 300K pull rod seat coaxial with the first 300K pull rod seat, and adjust the low-temperature end radial adjustment screw rod to make the second low-temperature end pull rod seat coaxial with the first low-temperature end pull rod seat;

[0012] Step 2: Install the second 300K pull rod seat on the vacuum vessel and install the second low-temperature end pull rod seat on the low-temperature skeleton;

[0013] Step 3: Rotate the 300K end radial adjustment bolt and the low-temperature end radial adjustment bolt counterclockwise or clockwise in sequence to make the magnet translate in a single horizontal direction, thereby adjusting the relative position between the magnet and the vacuum vessel in the horizontal direction; without adjusting the length of the carbon fiber pull rod, rotate the 300K end axial adjustment bolt counterclockwise or clockwise in sequence to make the magnet move vertically, thereby adjusting the relative position between the magnet and the vacuum vessel in the vertical direction;

[0014] Step 4: Rotate the 300K end axial adjustment bolt counterclockwise or clockwise further to compress the spring, thereby changing the vibration damping stiffness of the entire magnet.

[0015] The beneficial effects of the present invention are:

[0016] A spring is arranged inside the second 300K pull rod seat of the present invention, which can reduce the vibration of the magnet during transportation. At the same time, the vibration damping stiffness can be changed according to the weight of the magnet to ensure that the skeleton will not collide with external components during transportation.

[0017] The present invention is provided with a radial adjustment bolt and an axial adjustment bolt between the first and second 300K tie rod seats. At the same time, the tie rod group is provided with a bellows, which can realize the adjustment of the relative position between the framework and the 300K container in a single direction under normal temperature or low temperature conditions.

[0018] A spring is arranged between the axial adjustment bolt of the present invention and the carbon fiber shaft, which can reduce the impact force of the tie rod during transportation. At the same time, the damping stiffness is adjustable to adapt to various road conditions, avoiding excessive stress on a single tie rod and causing fracture.

[0019] The lower end of the carbon fiber shaft of the present invention is processed with a spherical protrusion, which increases the contact thermal resistance between the tie rod group and the low-temperature framework and reduces the conduction heat leakage of the tie rod group to the magnet. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the three-dimensional tie rod device with single-degree-of-freedom adjustment of the present invention;

[0021] Figure 2 is a sectional view of the high-temperature end of the three-dimensional tie rod device with single-degree-of-freedom adjustment of the present invention;

[0022] Figure 3 is a sectional view of the low-temperature end of the three-dimensional tie rod device with single-degree-of-freedom adjustment of the present invention;

[0023] Figure 4 is a schematic diagram of the low-temperature end of the three-dimensional tie rod device with single-degree-of-freedom adjustment of the present invention;

[0024] Figure 5 is a schematic structural diagram of the high-temperature structure of the three-dimensional tie rod device with single-degree-of-freedom adjustment of the present invention.

[0025] In the figure: 1 - the first 300K tie rod seat; 2 - the second 300K tie rod seat; 3 - the 300K end axial adjustment bolt; 4 - the 300K end radial adjustment bolt; 5 - the upper carbon fiber shaft; 6 - the spring; 7 - the gasket; 8 - the upper adjustment nut; 9 - the ball pad; 10 - the bellows; 11 - the seal sleeve; 12 - the carbon fiber tie rod; 13 - the heat sink; 14 - the first low-temperature end tie rod seat; 15 - the second low-temperature end tie rod seat; 16 - the low-temperature end radial adjustment bolt; 17 - the lower carbon fiber shaft; 18 - the lower end cover plate; 19 - the lower adjustment nut; 20 - the threaded sleeve. Detailed Embodiments

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0027] As Figures 1 - 5As shown in the figure, the present invention provides a three-dimensional tie rod device with single-degree-of-freedom adjustment, including a first 300K tie rod seat 1; a second 300K tie rod seat 2; a 300K end axial adjustment bolt 3; a 300K end radial adjustment bolt 4; an upper carbon fiber shaft 5; a spring 6; a gasket 7; an upper adjustment nut 8; a ball gasket 9; a bellows 10; a seal sleeve 11; a carbon fiber tie rod 12; a heat sink 13; a first low-temperature end tie rod seat 14; a second low-temperature end tie rod seat 15; a low-temperature end radial adjustment bolt 16; a lower carbon fiber shaft 17; a lower cover plate 18; a lower adjustment nut 19; and a threaded sleeve 20.

[0028] The second 300K tie rod seat 2 is connected to the vacuum vessel. In one embodiment, the second 300K tie rod seat 2 is connected to the vacuum vessel by threads, and a sealing ring is installed between the second 300K tie rod seat 2 and the vacuum vessel. The bellows 10 is welded to the lower end face of the second 300K tie rod seat 2, the bellows 10 is welded to the seal sleeve 11, and the seal sleeve 11 is adhesively bonded to the carbon fiber tie rod 12 to achieve the seal between the tie rod group and the vacuum of the vacuum vessel interlayer.

[0029] The first 300K tie rod seat 1 is machined with a guide groove, and a 300K end axial adjustment bolt 3 is installed with threads above the guide groove; the upper carbon fiber shaft 5, the spring 6, and the gasket 7 are installed inside the guide groove. The spring 6 is installed above the upper carbon fiber shaft 5, and the gasket 7 is installed above the spring 6. The upper carbon fiber shaft 5 can move axially back and forth along the guide groove to achieve the relative position adjustment in the vertical direction between the framework and the vacuum vessel. The first 300K tie rod seat 1 is connected to the second 300K tie rod seat 2. In one embodiment, the first 300K tie rod seat 1 and the second 300K tie rod seat 2 are connected by a 300K end radial adjustment bolt 4 to achieve the adjustment of the degree of freedom in the horizontal direction of the tie rod group.

[0030] The threaded sleeve 20 is fixedly connected to the upper end of the carbon fiber tie rod 12. The threaded sleeve 20 is connected to the upper adjustment nut 8 by a bolt. The lower surface of the upper adjustment nut 8 is machined with a conical surface and is connected with the ball gasket 9 in a ball pair. The ball gasket 9 is installed in the positioning groove machined on the upper end face of the second 300K tie rod seat 2. The heat sink 13 can be installed in the middle of the carbon fiber tie rod 12. The heat sink 13 is connected to the cold shield to reduce the heat leakage conducted by the tie rod. The threaded sleeve 20 is also fixedly connected to the lower end of the carbon fiber tie rod 12. The threaded sleeve 20 is connected to the lower adjustment nut 19 by a bolt. The lower surface of the lower adjustment nut 19 is machined with a conical surface and is connected with the ball gasket 9 in a ball pair. The ball gasket 9 is installed in the positioning groove machined on the lower end face of the first low-temperature end tie rod seat 14.

[0031] The first low-temperature end tie rod seat 14 is connected to the second low-temperature end tie rod seat 15. In one embodiment, they can be connected by the low-temperature end radial adjustment bolt 16. The second low-temperature end tie rod seat 15 is bolted to the superconducting magnet skeleton. A lower carbon fiber shaft 17 is installed between the first low-temperature end tie rod seat 14 and the lower end cover plate 18. The end face of the lower carbon fiber shaft 17 is machined with a spherical protrusion and is in point contact with the second low-temperature end tie rod seat 15 to reduce the conduction heat leakage of the tie rod group to the magnet.

[0032] The vacuum vessel needs to provide several horizontal planes for the installation of the second 300K tie rod seat 2. Before installing the tie rod group, it is necessary to adjust the 300K end axial adjustment bolt 3 so that the screwed length between it and the second 300K tie rod seat 2 is adjusted to be the same; adjust the 300K end radial adjustment bolt 4 to make the second 300K tie rod seat 2 coaxial with the first 300K tie rod seat 1, and adjust the low-temperature end radial adjustment screw 16 to make the second low-temperature end tie rod seat 15 coaxial with the first low-temperature end tie rod seat 14.

[0033] Install the second 300K tie rod seat 2 of the tie rod group on the vacuum vessel. When installing, it is necessary to install a sealing rubber ring between the second 300K tie rod seat 2 and the vacuum vessel and lock it with bolts. Install the second low-temperature end tie rod seat 15 on the low-temperature skeleton and lock it with bolts.

[0034] Generally, multiple groups of tie rods are symmetrically arranged along the horizontal and vertical planes for a superconducting magnet. There will be a certain angle between each group of tie rods and the magnet, and between the vacuum vessel. Here, it is assumed that Z represents the vertical direction, and X and Y represent the horizontal directions. Assume that it is necessary to adjust the relative position of the magnet and the vacuum vessel in the horizontal direction. Rotate the 300K end radial adjustment bolt 4 or the low-temperature end radial adjustment bolt 16 counterclockwise or clockwise in turn to make the magnet translate in a single horizontal direction. Assume that it is necessary to adjust the relative position of the magnet and the 300K dewar in the vertical direction. Without adjusting the length of the carbon fiber tie rod 12, rotate the 300K end axial adjustment bolt 3 counterclockwise or clockwise in turn to make the magnet move in the vertical direction.

[0035] A spring is installed between the upper carbon fiber shaft 5 and the second 300K tie rod seat 2, which can achieve vibration damping of the magnet during transportation. If it is necessary to adjust the vibration damping stiffness, rotate the 300K end axial adjustment bolt 3 counterclockwise or clockwise to further compress the spring 6, thereby changing the vibration damping stiffness of the entire magnet.

[0036] Therefore, according to the embodiments of the present invention, a method for using a three-dimensional tie rod device with single-degree-of-freedom adjustment is also provided, including the following steps:

[0037] Step 1. Adjust the screwing length of the 300K end axial adjustment bolt 3 to be the same as that between the second 300K tie rod seat 2; adjust the 300K end radial adjustment bolt 4 to make the second 300K tie rod seat 2 coaxial with the first 300K tie rod seat 1, and adjust the cryogenic end radial adjustment screw 16 to make the second cryogenic end tie rod seat 15 coaxial with the first cryogenic end tie rod seat 14. Among them, the vacuum vessel provides several horizontal planes for the installation of the second 300K tie rod seat 2.

[0038] Step 2. Install the second 300K tie rod seat 2 on the vacuum vessel. A sealing rubber ring can be installed between the second 300K tie rod seat 2 and the vacuum vessel during installation and locked with bolts. Install the second cryogenic end tie rod seat 15 on the cryogenic framework and lock it with bolts.

[0039] Step 3. Rotate the 300K end radial adjustment bolt 4 and the cryogenic end radial adjustment bolt 16 counterclockwise or clockwise in sequence to make the magnet translate in a single horizontal direction, thereby adjusting the relative position of the magnet and the vacuum vessel in the horizontal direction; without adjusting the length of the carbon fiber tie rod, rotate the 300K end axial adjustment bolt 3 counterclockwise or clockwise in sequence to make the magnet move in the vertical direction, thereby adjusting the relative position of the magnet and the vacuum vessel in the vertical direction.

[0040] Step 4. Rotate the 300K end axial adjustment bolt 3 counterclockwise or clockwise to further compress the spring 6, thereby changing the vibration damping stiffness of the entire magnet.

[0041] Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A three-dimensional pull rod device with single degree of freedom adjustment, characterized in that: The invention comprises a first 300K tie rod seat (1); a second 300K tie rod seat (2); a 300K end axial adjustment bolt (3); a 300K end radial adjustment bolt (4); an upper end carbon fiber shaft (5); a spring (6); a gasket (7); an upper end adjustment nut (8); a ball gasket (9); a bellows (10); a sealing sleeve (11); a carbon fiber tie rod (12); a heat sink (13); a first low-temperature end tie rod seat (14); a second low-temperature end tie rod seat (15); a low-temperature end radial adjustment bolt (16); a lower end carbon fiber shaft (17); a lower end cover plate (18); a lower end adjustment nut (19); and a threaded sleeve (20). The second 300K tie rod seat (2) is connected to the vacuum container, a bellows (10) is welded to the lower end surface of the second 300K tie rod seat (2), the bellows (10) is welded to the sealing sleeve (11), and the sealing sleeve (11) is glued to the carbon fiber tie rod (12); The first 300K tie rod seat (1) is internally processed with a guide groove, the upper part of the guide groove is processed with a thread and a 300K end axial adjustment bolt (3) is installed; the upper end carbon fiber shaft (5), a spring (6) and a gasket (7) are installed inside the guide groove, the upper part of the upper end carbon fiber shaft (5) is installed with a spring (6), and the upper part of the spring (6) is installed with a gasket (7); the upper end carbon fiber shaft (5) can reciprocate along the axial direction of the guide groove, and the first 300K tie rod seat (1) is connected to the second 300K tie rod seat (2); The upper end of the carbon fiber tie rod (12) is fixedly connected to a threaded sleeve (20); the lower end of the carbon fiber tie rod (12) is fixedly connected to a threaded sleeve (20); the threaded sleeve (20) is bolted to a first low-temperature end tie rod seat (14); the first low-temperature end tie rod seat (14) is connected to a second low-temperature end tie rod seat (15); and the second low-temperature end tie rod seat (15) is bolted to a superconducting magnet skeleton; a lower end carbon fiber shaft (17) is installed between the first low-temperature end tie rod seat (14) and the lower end cover plate (18); the end surface of the lower end carbon fiber shaft (17) is processed with a spherical protrusion and is in point contact with the second low-temperature end tie rod seat (15).

2. The three-dimensional pull rod device with single degree of freedom adjustment according to claim 1, characterized in that: The second 300K tie rod seat (2) is connected to the vacuum container via threads.

3. The three-dimensional pull rod device with single degree of freedom adjustment according to claim 2, characterized in that: A sealing ring is installed between the second 300K tie rod seat (2) and the vacuum container.

4. The three-dimensional pull rod device with single degree of freedom adjustment according to claim 1, characterized in that: The first 300K tie rod seat (1) and the second 300K tie rod seat (2) are connected via a 300K end radial adjustment bolt (4).

5. The three-dimensional pull rod device with single degree of freedom adjustment according to claim 1, characterized in that: A heat sink (13) is installed in the middle of the carbon fiber pull rod (12), and the heat sink (13) is connected to the cold screen.

6. The three-dimensional pull rod device with single degree of freedom adjustment according to claim 1, characterized in that: The first low-temperature end tie rod seat (14) and the second low-temperature end tie rod seat (15) are connected via a low-temperature end radial adjustment bolt (16).

7. The three-dimensional pull rod device with single degree of freedom adjustment according to claim 1, characterized in that: A spring is installed between the upper carbon fiber shaft (5) and the second 300K pull rod seat (2).

8. A method for using a three-dimensional tie rod device with single degree of freedom adjustment, applicable to the three-dimensional tie rod device with single degree of freedom adjustment as claimed in any one of claims 1 to 7, characterized in that: include: Step 1: Adjust the axial adjustment bolt (3) at the 300K end so that the screwing length between it and the second 300K tie rod seat (2) is adjusted to be consistent; adjust the radial adjustment bolt (4) at the 300K end so that the second 300K tie rod seat (2) is coaxial with the first 300K tie rod seat (1); adjust the radial adjustment screw (16) at the low temperature end so that the second low temperature end tie rod seat (15) is coaxial with the first low temperature end tie rod seat (14); Step 2: Install the second 300K tie rod seat (2) on the vacuum container, and install the second low-temperature end tie rod seat (15) on the low-temperature frame; Step 3: rotate the 300K end radial adjustment bolt (4) and the low temperature end radial adjustment bolt (16) counterclockwise or clockwise in sequence to make the magnet move in a single horizontal direction, thereby adjusting the relative position of the magnet and the vacuum container in the horizontal direction; without adjusting the length of the carbon fiber pull rod, rotate the 300K end axial adjustment bolt (3) counterclockwise or clockwise in sequence to make the magnet move in the vertical direction, thereby adjusting the relative position of the magnet and the vacuum container in the vertical direction; Step 4: Rotate the 300K end axial adjustment bolt (3) counterclockwise or clockwise to further compress the spring (6), thereby changing the vibration damping stiffness of the entire magnet.

9. The method for using the three-dimensional tie rod device with single degree of freedom adjustment according to claim 8, characterized in that: In step 2, when the second 300K tie rod seat (2) is installed on the vacuum container, a sealing rubber ring is installed between the second 300K tie rod seat (2) and the vacuum container, and is tightened with bolts.

10. The method for using the three-dimensional tie rod device with single degree of freedom adjustment according to claim 8, characterized in that: Use bolts to lock the second low-temperature end tie rod seat (15) and the low-temperature frame.

Images