REBCO high-temperature superconducting magnet inner joint fastening device and fastening method

Abstract

The invention discloses an REBCO high-temperature superconducting magnet inner joint fastening device and fastening method, and relates to the technical field of REBCO high-temperature superconducting magnet development. Comprising a pressing plate and two pressing blocks. A through hole with an opening in one side is formed in the pressing plate, and the two pressing blocks are located in the through hole; a threaded hole communicated with the through hole is formed in the side, close to the opening, of the pressing plate and used for being in threaded connection with a bolt. The inner surface and the outer surface of the pressing block are both cambered surfaces, the inner diameter of the pressing block is consistent with the outer diameter of the inner connector, and the outer diameter of the pressing block is consistent with the inner diameter of the through hole. The magnet is simple in structure and convenient to operate, meets the requirement for rapid and firm fixing before winding, does not depend on adhesives, avoids related chemical and thermodynamic problems, and facilitates assembling and later maintenance of the magnet.

Description

Technical Field

[0001] This invention relates to the field of REBCO high-temperature superconducting magnet manufacturing technology, and in particular to a fastening device and method for fastening the internal joint of a REBCO high-temperature superconducting magnet. Background Technology

[0002] High-temperature superconducting technology, especially second-generation high-temperature superconducting tapes based on rare-earth barium copper oxide (REBCO) coatings, has shown enormous application potential in the field of strong-field magnets due to its excellent critical current density, high irreversible field, and good mechanical properties. It has become a core technology direction for cutting-edge scientific devices such as nuclear fusion, particle accelerators, magnetic resonance imaging, and high-energy physics experiments. As the requirements for magnetic field strength, stability, and reliability in these large-scale scientific projects increase, the development of large-scale, high-field, and even ultra-high-field REBCO superconducting magnets has become a current international research hotspot and focus of competition.

[0003] In the winding and manufacturing process of REBCO superconducting magnets, the reliable fixation of the internal joints of the superconducting tape is a crucial but often overlooked core step. The fixation effect of the internal joints directly affects the overall performance, operational stability, and service life of the magnet. Currently, the industry relies heavily on adhesives or simple binding methods for fixing internal joints. These traditional methods have significant limitations: adhesives have long curing times, which prolong the magnet manufacturing cycle; in the low-temperature environment of magnet operation, adhesives are prone to performance degradation, leading to a decrease in fixation strength and affecting the reliability of magnet operation; at the same time, adhesives may have potential chemical compatibility issues with the superconducting tape and other magnet components, thereby impairing superconducting performance; furthermore, the non-removable nature of adhesives greatly complicates the later inspection, maintenance, and troubleshooting of the magnet, increasing usage costs and safety risks. Simple binding methods suffer from insufficient fixation strength and uneven stress, failing to meet the stringent structural stability requirements of high-field magnets. Therefore, a novel internal joint fastening solution is urgently needed to overcome the shortcomings of existing technologies. Summary of the Invention

[0004] The main objective of this invention is to provide a fastening device and method for the internal joint of a REBCO high-temperature superconducting magnet, so as to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides a fastening device for the internal connector of a REBCO high-temperature superconducting magnet, comprising a pressure plate and two pressure blocks; the pressure plate has a through hole with an opening on one side, and the two pressure blocks are located inside the through hole; the side of the pressure plate near the opening is provided with a threaded hole communicating with the through hole, and the threaded hole is used for threading bolts; the inner and outer surfaces of the pressure blocks are both arc surfaces, the inner diameter of the pressure blocks is consistent with the outer diameter of the internal connector, and the outer diameter of the pressure blocks is consistent with the inner diameter of the through hole.

[0006] Furthermore, the material of the pressure plate is 304 stainless steel.

[0007] Furthermore, the material of the pressing block is copper.

[0008] Furthermore, the pressure plate is provided with threaded holes communicating with the through holes on both sides near the opening.

[0009] Furthermore, the pressure plate and the pressure block have the same thickness.

[0010] Furthermore, positioning holes are provided on the outer surface of the pressure block.

[0011] This invention also provides a method for fastening the internal joint of a REBCO high-temperature superconducting magnet, comprising the following steps: S1. Positioning: Place the inner connector to be connected at the predetermined fixed position on the magnet frame, and initially adjust its posture to make it in the most suitable state for winding and stress. S2. Place the pressure block accurately at the top of the inner connector, ensuring that the pressure block completely covers the connector area that needs to be tightened and is centered to ensure that the applied pressure is evenly distributed. S3. Place the pressure plate, ensuring good contact between the pressure plate and the pressure block; then screw the bolt into the threaded hole of the pressure plate. Initially, screw it in manually for a few turns, then use a tool to slowly rotate the bolt, gradually and steadily increasing the positive pressure on the pressure block. S4. Continue to tighten the bolts until the inner connector is firmly fixed to the magnet frame and cannot be moved by hand.

[0012] The present invention has the following beneficial effects: 1. The present invention has a simple structure and is easy to operate, which meets the need for quick and firm fixation before winding, and does not rely on adhesives, thus avoiding related chemical and thermodynamic problems, and facilitating the assembly and subsequent maintenance of magnets.

[0013] 2. By rotating the bolt, the positive pressure applied to the inner joint can be increased precisely and gradually, thereby achieving controllable adjustment of the friction force.

[0014] 3. This invention transforms the traditional passive fixing into an active mechanical locking, forming a strong mechanical bond between the inner connector and the magnet frame, which can effectively resist the impact of winding tension and electromagnetic force during operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a REBCO high-temperature superconducting magnet internal joint fastening device according to the present invention.

[0016] Figure 2 This is a schematic diagram of the clamping block of a REBCO high-temperature superconducting magnet internal connector fastening device according to the present invention.

[0017] Wherein, 1-pressure block; 2-pressure plate; 3-threaded hole. Detailed Implementation

[0018] To achieve the above objectives and effects, the technical means and structure adopted by the present invention will be described in detail with reference to the accompanying drawings, focusing on the features and functions of the preferred embodiments of the present invention.

[0019] like Figure 1-2 As shown, this invention provides a fastening device and method for the internal connector of a REBCO high-temperature superconducting magnet, including a pressure plate 2 and two pressure blocks 1. The pressure plate 2 has a through hole with an opening on one side, and the two pressure blocks 1 are located within the through hole. The pressure plate 2 has a threaded hole 3 communicating with the through hole on the side near the opening, and the threaded hole 3 is used for threading bolts. The inner and outer surfaces of the pressure blocks 1 are both arc surfaces. The inner diameter of the pressure block 1 is the same as the outer diameter of the internal connector, and the outer diameter of the pressure block 1 is the same as the inner diameter of the through hole. By screwing bolts into the threaded holes 3, a controllable positive pressure is applied to the pressure blocks 1, thereby generating static friction between the pressure blocks 1 and the internal connector, and between the internal connector and the magnet frame, thus achieving a firm fixation of the internal connector to the magnet frame.

[0020] The pressure plate 2 is made of 304 stainless steel, which has high strength and serves to bear pressure.

[0021] The pressure block 1 is made of copper, which has low hardness, to prevent damage to the brittle REBCO superconducting tape or crushing of the joint structure, thus protecting the inner joint.

[0022] In another embodiment, the pressure plate 2 is provided with threaded holes 3 communicating with the through hole on both sides near the opening, which can improve efficiency by applying pressure simultaneously from both sides.

[0023] In another embodiment, the pressure plate 2 and the pressure block 1 have the same thickness, and the outer surface of the pressure block 1 is provided with positioning holes, into which bolts can be abutted; the positioning holes are used to prevent the pressure block 1 from deviating during bolt pressure.

[0024] This invention also provides a method for fastening the internal joint of a REBCO high-temperature superconducting magnet, comprising the following steps: S1. Positioning: Place the inner connector to be connected at the predetermined fixed position on the magnet frame, and initially adjust its posture to make it in the most suitable state for winding and stress. S2. Place pressure block 1. Place pressure block 1 accurately at the upper end of the inner joint, ensuring that pressure block 1 completely covers the joint area that needs to be tightened, and that the position is centered to ensure that the applied pressure is evenly distributed. S3. Place pressure plate 2 to ensure good contact between pressure plate 2 and pressure block 1; then screw the bolt into the threaded hole 3 of pressure plate 2. At the beginning, you can screw it in by hand for a few turns, and then use a suitable tool (such as a wrench) to slowly rotate the bolt. The purpose is to gradually and steadily increase the positive pressure on pressure block 1. As the positive pressure increases, the static friction between the inner joint and the skeleton will gradually increase in sync. S4. Continue to tighten the bolts until the inner connector is firmly fixed to the magnet frame and cannot be moved by hand. At this point, you should feel a significant increase in the torque of the bolt tightening, indicating that sufficient tightening force has been achieved. Avoid using excessive force to tighten the bolts during the process to prevent damage to the brittle REBCO superconducting tape or crushing of the connector structure.

[0025] The above description is only a preferred embodiment of the present invention and not all embodiments. Anyone should know that structural changes made under the guidance of the present invention, and any technical solutions that are the same as or similar to the present invention, are within the protection scope of the present invention.

Claims

1. A fastening device for the internal joint of a REBCO high-temperature superconducting magnet, characterized in that, It includes a pressure plate and two pressure blocks; the pressure plate has a through hole with an opening on one side, and the two pressure blocks are located in the through hole; the side of the pressure plate near the opening is provided with a threaded hole communicating with the through hole, and the threaded hole is used to screw bolts; the inner and outer surfaces of the pressure blocks are both arc surfaces, the inner diameter of the pressure block is the same as the outer diameter of the inner connector, and the outer diameter of the pressure block is the same as the inner diameter of the through hole.

2. The REBCO high-temperature superconducting magnet internal connector fastening device as described in claim 1, characterized in that, The pressure plate is made of 304 stainless steel.

3. The REBCO high-temperature superconducting magnet internal joint fastening device as described in claim 2, characterized in that, The material of the pressing block is copper.

4. A REBCO high-temperature superconducting magnet internal joint fastening device as described in claim 1, 2, or 3, characterized in that, The pressure plate has threaded holes that communicate with the through holes on both sides near the opening.

5. The REBCO high-temperature superconducting magnet internal joint fastening device as described in claim 4, characterized in that, The pressure plate and the pressure block have the same thickness.

6. The REBCO high-temperature superconducting magnet internal connector fastening device as described in claim 4, characterized in that, The outer surface of the pressure block is provided with positioning holes.

7. A method for fastening the internal joint of a REBCO high-temperature superconducting magnet, characterized in that, The REBCO high-temperature superconducting magnet internal joint fastening device according to any one of claims 1-6 includes the following steps: S1. Positioning: Place the inner connector to be connected at the predetermined fixed position on the magnet frame, and initially adjust its posture to make it in the most suitable state for winding and stress. S2. Place the pressure block accurately at the top of the inner connector, ensuring that the pressure block completely covers the connector area that needs to be tightened and is centered to ensure that the applied pressure is evenly distributed. S3. Place the pressure plate, ensuring good contact between the pressure plate and the pressure block; then screw the bolt into the threaded hole of the pressure plate. Initially, screw it in manually for a few turns, then use a tool to slowly rotate the bolt, gradually and steadily increasing the positive pressure on the pressure block. S4. Continue to tighten the bolts until the inner connector is firmly fixed to the magnet frame and cannot be moved by hand.

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