Low-temperature superconducting magnet pull rod detection device

Abstract

The utility model belongs to the technical field of semiconductor low-temperature superconducting magnets, and particularly relates to a low-temperature superconducting magnet pull rod detection device, which comprises a tension bracket, a motor, a chain winding drum, a stretching chain, a tension meter and a liquid nitrogen cooling box. Wherein the liquid nitrogen cooling box is used for containing liquid nitrogen, during testing, after the pull rod is firmly installed, the liquid nitrogen is slowly poured into the liquid nitrogen cooling box, and the pull rod is immersed by the liquid nitrogen in the liquid nitrogen cooling box. According to the utility model, stretching detection can be effectively and accurately carried out on the bonded pull rod, the working environment of the pull rod in a low-temperature superconducting magnet can be highly restored, and the pull rod is in a low-temperature state during stretching detection, so that the measurement result is accurate, and the effective load of the pull rod can be known in advance before the pull rod is mounted on low-temperature superconducting magnet equipment; therefore, excitation failure or coil falling and the like caused by the loading problem of the pull rod during operation or transportation of the low-temperature superconducting magnet are avoided, the structure is simple, and the use is reliable.

Description

Technical Field

[0001] This invention belongs to the field of semiconductor low-temperature superconducting magnet technology, specifically a low-temperature superconducting magnet pull rod detection device. Background Technology

[0002] In a superconducting magnet system, in order to ensure the stable operation and normal transportation of the cryogenic superconducting magnet, a tie rod device is generally used to connect and fix the various components of the superconducting magnet in series. The tie rod device is used to support the weight of the superconducting magnet during stable operation and normal transportation, thus ensuring the stability and safety of the superconducting magnet system.

[0003] Because superconducting magnets are significantly affected by coil fluctuations during excitation, multiple axial and radial tie rods need to be evenly placed both above and below the magnet to ensure uniform force distribution. For example... Figure 1 As shown, the manufacturing of the tie rod requires a strict process. The material of the tie rod is selected based on the heat leakage calculation of the cryogenic magnet, such as carbon tie rod, G10 tie rod, or titanium alloy tie rod. After the material of the tie rod is determined, the size of the tie rod body 0011 suitable for the cryogenic superconducting magnet is selected according to the design requirements of the magnet. A suitable threaded connector 0012 is then selected for the insertion and bonding of the tie rod. The threaded connector 0012 has a wedge-shaped opening inside that corresponds to the end of the tie rod body 0011. After the end of the tie rod body 0011 is inserted into the corresponding wedge-shaped opening of the threaded connector 0012, epoxy resin is injected into it. After ensuring complete injection, the resin is allowed to solidify. During the resin solidification period, the tie rod body 0011 needs to be continuously rotated to ensure that the resin adheres evenly to the inside of the threaded connector 0012.

[0004] To avoid excessive stress on a particular tie rod due to unbalanced load distribution, each tie rod needs to be tested for tension after bonding. This is to prevent excitation failure or coil detachment of the cryogenic superconducting magnet during operation or transportation caused by tie rod load issues. Therefore, a cryogenic superconducting magnet tie rod testing device is needed. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this invention is to provide a low-temperature superconducting magnet pull rod detection device.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A cryogenic superconducting magnet pull rod testing device includes a tension bracket, a motor, a chain drum, a tension chain, a tension gauge, and a liquid nitrogen cooling box. The tension bracket has an upper mounting beam and a lower mounting beam. The upper mounting beam is located above the lower mounting beam. The liquid nitrogen cooling box is fixed to the lower mounting beam and is used to hold liquid nitrogen. The interior of the liquid nitrogen cooling box is provided with a threaded connector sleeve A.

[0008] The motor housing is fixed to the upper mounting beam. The drive end of the motor is connected to the chain drum and is used to drive the chain drum to rotate. One end of the tension chain is fixed to the outer circumferential surface of the chain drum. The other end of the tension chain is wound around the outer circumferential surface of the chain drum several times and then fixed to the housing of the tension gauge. The detection end of the tension gauge is connected to a threaded connector sleeve B.

[0009] In use, the threaded connector sleeve A is threadedly connected to the threaded connector at the bottom of the pull rod to be tested, and the threaded connector sleeve B is threadedly connected to the threaded connector at the top of the pull rod to be tested.

[0010] The threaded connector sleeve B is positioned vertically corresponding to the threaded connector sleeve A.

[0011] The threaded connector sleeve A is fixed to the bottom surface of the liquid nitrogen cooling box or the lower mounting beam via a universal joint A; the threaded connector sleeve B is connected to the detection end of the tension gauge via a universal joint B.

[0012] An opening is formed at the top of the liquid nitrogen cooling box.

[0013] The liquid nitrogen cooling box has a cover at the top opening for sealing the top opening.

[0014] The liquid nitrogen cooling box has a liquid inlet on its side, and the liquid inlet is fitted with a removable cap.

[0015] The advantages and positive effects of this utility model are as follows:

[0016] This invention can effectively and accurately perform tensile testing on bonded tie rods, and can highly replicate the working environment of the tie rod in the cryogenic superconducting magnet. The tie rod is kept at a low temperature during the tensile test, thus ensuring accurate measurement results. The effective load of the tie rod can be known in advance before it is installed in the cryogenic superconducting magnet equipment, thereby avoiding excitation failure or coil detachment of the cryogenic superconducting magnet during operation or transportation caused by load problems of the tie rod. The structure is simple and the use is reliable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the tie rod to which this utility model applies;

[0018] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 3 This is a schematic diagram showing the arrangement of the pull rod in the liquid nitrogen cooling box during use.

[0020] In the diagram: 1 is the tension bracket, 101 is the upper mounting beam, 102 is the lower mounting beam, 2 is the motor, 3 is the tension chain, 4 is the tension gauge, 5 is the liquid nitrogen cooling box, 501 is the inlet, 6 is the threaded connector sleeve A, and 7 is the threaded connector sleeve B.

[0021] 001 is the pull rod, 0011 is the pull rod body, and 0012 is the threaded connector. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail.

[0023] A low-temperature superconducting magnet pull rod detection device, such as Figure 1-3 As shown, this embodiment includes a tension bracket 1, a motor 2, a chain drum, a tension chain 3, a tension gauge 4, and a liquid nitrogen cooling box 5. The tension bracket 1 has an upper mounting beam 101 and a lower mounting beam 102. The upper mounting beam 101 is located above the lower mounting beam 102. The liquid nitrogen cooling box 5 is fixed to the lower mounting beam 102 and is used to hold liquid nitrogen. The interior of the liquid nitrogen cooling box 5 is provided with a threaded connector sleeve A 6. The liquid nitrogen cooling box 5, filled with liquid nitrogen, is used to restore the working environment of the pull rod 001 in the low-temperature superconducting magnet, so that the pull rod 001 is in a low-temperature state during tensile testing, thereby accurately measuring the results.

[0024] The housing of motor 2 is fixed to the upper mounting beam 101. The drive end of motor 2 is connected to a chain drum (omitted in the figure) and is used to drive the chain drum to rotate. One end of the tension chain 3 is fixed to the outer circumferential surface of the chain drum. The other end of the tension chain 3 is wound several times around the outer circumferential surface of the chain drum and then fixed to the housing of the tension gauge 4. The detection end of the tension gauge 4 is connected to a threaded connector sleeve B 7. In this embodiment, motor 2 is a commercially available product, and its operation is controlled by an external controller. The specific installation structure between the chain drum, motor 2, and tension chain 3 all adopt existing technology. In this embodiment, tension gauge 4 is also a commercially available product, which communicates with the external controller to transmit the detected tension data.

[0025] Specifically, since the pull rod 001 is generally not allowed to be subjected to shear force, in this embodiment, the threaded connector sleeve B 7 and the threaded connector sleeve A 6 are positioned vertically correspondingly. The threaded connector sleeve A 6 can be further fixed to the bottom surface of the liquid nitrogen cooling box 5 or the lower mounting beam 102 via a universal joint A (omitted in the figure), and the threaded connector sleeve B 7 is further connected to the detection end of the tension gauge 4 via a universal joint B (omitted in the figure). Through the cooperation of the tension chain 3 with universal joints A and B, the pull rod 001 can always be in a natural vertical state and subjected to only axial tensile force during testing, ensuring accurate and reliable testing. Universal joints A and B, as well as their installation structures with other components, all utilize existing technologies. In this embodiment, universal joint B can be fixed to the threaded connector sleeve B 7 and the detection end of the tension gauge 4 by welding or using fasteners such as bolts. Universal joint A can be directly fixed to the lower mounting beam 102 by welding or using fasteners such as bolts and is also fixed to the threaded connector sleeve A 6. The bottom of the liquid nitrogen cooling box 5 has a through hole for installing universal joint A. It is necessary to ensure that the liquid nitrogen cooling box 5, universal joint A, and threaded connector sleeve A 6 do not leak after installation.

[0026] Specifically, in this embodiment, the upper end of the liquid nitrogen cooling box 5 has an opening, allowing liquid nitrogen to be poured directly into it. A lid can be provided at the upper opening of the liquid nitrogen cooling box 5 to seal it, preventing liquid nitrogen from vaporizing and overflowing, and to provide insulation. The specific installation structure of the lid can be adjusted arbitrarily according to usage requirements. Figure 3 As shown, a liquid nitrogen cooling box 5 may be further provided with a liquid inlet 501 on its side. The liquid inlet 501 is equipped with a removable cover. The liquid inlet 501 can be used to assist in the input or output of liquid nitrogen in the liquid nitrogen cooling box 5. The liquid inlet 501 is normally closed by the cover.

[0027] Working principle:

[0028] During use, place the tension bracket 1 stably on the ground, and put the pull rod 001 to be tested into the liquid nitrogen cooling box 5. Connect the threaded connector sleeve A 6 to the threaded connector 0012 at the bottom of the pull rod 001 through threads, and connect the threaded connector sleeve B 7 to the threaded connector 0012 at the top of the pull rod 001 through threads. After confirming that it is firmly installed, slowly pour liquid nitrogen into the liquid nitrogen cooling box 5 so that the pull rod 001 is submerged in liquid nitrogen in the liquid nitrogen cooling box 5 to simulate the low temperature environment of the pull rod 001 in the low temperature superconducting magnet, so as to make the measurement parameters more accurate.

[0029] Initially, the tension gauge is reset to zero. Motor 2 drives the chain drum to rotate and wind up the tension chain 3. The tension chain 3 slowly pulls the tension gauge 4 upwards, stretching the pull rod 001. When the reading on the tension gauge 4 reaches a preset value (five times the weight of the cryogenic superconducting magnet in this embodiment), motor 2 stops working, and the pull rod 001 stops stretching. After 10 minutes, motor 2 restarts, driving the chain drum to rotate and releasing the tension chain 3. The pull rod 001 is then removed from the liquid nitrogen cooling box 5 and checked for any partial detachment. If no detachment occurs, the pull rod 001 is considered intact and can continue to be used.

Claims

1. A low-temperature superconducting magnet pull rod detection device, characterized in that: The device includes a tension bracket (1), a motor (2), a chain drum, a tension chain (3), a tension gauge (4), and a liquid nitrogen cooling box (5). The tension bracket (1) has an upper mounting beam (101) and a lower mounting beam (102). The upper mounting beam (101) is located above the lower mounting beam (102). The liquid nitrogen cooling box (5) is fixed to the lower mounting beam (102) and is used to hold liquid nitrogen. The liquid nitrogen cooling box (5) has a threaded connector sleeve A (6) inside. The outer casing of the motor (2) is fixed to the upper mounting beam (101). The drive end of the motor (2) is connected to the chain drum and is used to drive the chain drum to rotate. One end of the tension chain (3) is fixed to the outer circumferential surface of the chain drum. The other end of the tension chain (3) is wound around the outer circumferential surface of the chain drum several times and then fixed to the outer casing of the tension gauge (4). The detection end of the tension gauge (4) is connected to a threaded connector sleeve B (7). In use, the threaded connector sleeve A (6) is threadedly connected to the threaded connector (0012) at the lowest end of the pull rod (001) to be tested, and the threaded connector sleeve B (7) is threadedly connected to the threaded connector (0012) at the highest end of the pull rod (001) to be tested.

2. The low-temperature superconducting magnet pull rod detection device according to claim 1, characterized in that: The threaded connector sleeve B (7) and the threaded connector sleeve A (6) are positioned vertically in a corresponding manner.

3. The low-temperature superconducting magnet pull rod detection device according to claim 2, characterized in that: The threaded connector sleeve A (6) is fixed to the bottom surface of the liquid nitrogen cooling box (5) or the lower mounting beam (102) via a universal joint A; the threaded connector sleeve B (7) is connected to the detection end of the tension gauge (4) via a universal joint B.

4. The low-temperature superconducting magnet pull rod detection device according to claim 1, characterized in that: An opening is formed at the top of the liquid nitrogen cooling box (5).

5. The low-temperature superconducting magnet pull rod detection device according to claim 4, characterized in that: The liquid nitrogen cooling box (5) has a cover at the upper opening for sealing the upper opening of the liquid nitrogen cooling box (5).

6. The low-temperature superconducting magnet pull rod detection device according to claim 1, characterized in that: The liquid nitrogen cooling box (5) has a liquid inlet (501) on its side, and the liquid inlet (501) is fitted with a removable cover.

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