A high-temperature superconducting tape joint structure, a high-temperature superconducting magnet and a welding device

Abstract

The utility model discloses a kind of high-temperature superconducting tape joint structure, high-temperature superconducting magnet and welding device, joint structure is applied to high-temperature superconducting magnet, high-temperature superconducting magnet includes a plurality of pie-shaped coils sequentially stacked along the axial direction, the outgoing line end of a pie-shaped coil is provided with first tape, the incoming line end of another pie-shaped coil adjacent is provided with second tape;Including welding conductive block, welding conductive block is used to connect the first tape and second tape of two pie-shaped coils adjacent, and with top end surface of horizontal arrangement;First tape and second tape are all horizontally arranged in the top end surface of welding conductive block, and are staggered along the axial direction arrangement;The top end surface of first tape and second tape is at least partially covered with superconducting bridge tape, and first solder layer is arranged between first tape and second tape and superconducting bridge tape;The utility model effectively improves the resistance performance and quality stability of joint structure.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature superconducting magnet technology, specifically to a high-temperature superconducting tape joint structure, a high-temperature superconducting magnet, and a welding device. Background Technology

[0002] High-temperature superconducting materials, due to their advantages such as high critical temperature, high current-carrying capacity, and high critical magnetic field, have broad application prospects in fields such as high-field magnets, superconducting energy storage, large particle colliders, and superconducting magnetic resonance imaging. To avoid problems such as excessive heat generation, unsatisfactory magnetic fields, and difficulty in locating fault points, most existing high-temperature superconducting magnets are typically constructed by stacking disc coils axially. These disc coils are made by winding high-temperature superconducting tape. Due to limitations in manufacturing technology, the length of a single high-temperature superconducting tape is currently limited to only a few hundred meters. Therefore, a joint needs to be welded between the input and output ends of adjacent disc coils in a high-temperature superconducting magnet to connect them in series. The performance of this joint directly affects the performance and operation of the high-temperature superconducting magnet.

[0003] However, in the existing high-temperature superconducting magnet joints, the welding pressure applied by the welding head directly acts on the pancake coil of the high-temperature superconducting magnet during the welding process, which can easily lead to damage to the pancake coil and affect the quality performance of the high-temperature superconducting magnet. Therefore, there is an urgent need for a joint structure that can ensure the quality performance of high-temperature superconducting magnets. Utility Model Content

[0004] In view of this, the present invention provides a high-temperature superconducting tape joint structure, a high-temperature superconducting magnet and a welding device, to solve the problem that there is no joint structure in the prior art that can ensure the quality performance of high-temperature superconducting magnets.

[0005] In a first aspect, this utility model provides a high-temperature superconducting tape joint structure for use in high-temperature superconducting magnets. The high-temperature superconducting magnet includes multiple disc coils stacked sequentially along the axial direction. A first tape is provided at the output end of one disc coil, and a second tape is provided at the input end of an adjacent disc coil. The structure includes a welding conductive block for connecting the first and second tapes of two adjacent disc coils and has a horizontally positioned top surface. The first and second tapes are both horizontally positioned on the top surface of the welding conductive block and are staggered along the axial direction. The top surfaces of the first and second tapes are at least partially covered by a superconducting bridging tape, and a first solder layer is provided between the first and second tapes and the superconducting bridging tape.

[0006] The high-temperature superconducting tape joint structure according to this utility model has at least the following beneficial effects:

[0007] The first and second strips of two adjacent disc coils of a vertically arranged (i.e., in a vertical position) high-temperature superconducting magnet are connected by welding conductive blocks. The top surface of the welding conductive blocks is parallel to the horizontal direction, allowing the first strip at the output end of one disc coil and the second strip at the input end of the adjacent disc coil to be placed horizontally on the top surface of the welding conductive blocks. The first and second strips, which are offset along the axial direction, are covered and connected by a superconducting bridging strip with a relatively wide width, and the superconducting bridging strip is arranged parallel to the horizontal direction. In the process of preparing this high-temperature superconducting strip joint structure by descending the welding head in a vertical direction, firstly, the first solder layer located between the first strip and the superconducting bridging strip, and between the second strip and the superconducting bridging strip, is not easily lost due to gravity; secondly, the downward pressing direction of the welding head is perpendicular to the orientation of the first and second strips. The welding head is positioned to ensure that the lower end face of the welding head is aligned with the orientation of the first and second strips. This allows the first and second strips to be horizontal during welding without twisting their orientation, reducing damage to them and improving welding quality and efficiency. This ensures the quality of the high-temperature superconducting strip joint structure and effectively improves its resistance performance and quality stability. Consequently, the high-temperature superconducting magnet equipped with this joint structure exhibits low resistance and high mechanical strength. Thirdly, the welding conductive block provides stable support for the entire structure formed by the first, second, and superconducting bridging strips. This effectively prevents pressure from directly affecting the performance of the disc coil during welding, thus ensuring the high-temperature superconducting magnet equipped with this joint structure possesses high mechanical strength.

[0008] In one optional embodiment, a second solder layer is provided between the first strip and the second strip and the top surface of the welding conductive block;

[0009] And / or, a third solder layer is provided between the first strip and the second strip along the axial direction.

[0010] In one optional embodiment, the welding conductive block is provided with a first inclined portion and a second inclined portion at both ends along the horizontal direction; the first inclined portion is used for overlapping the outgoing end integrally formed with the first strip, and the second inclined portion is used for overlapping the incoming end integrally formed with the second strip.

[0011] In one optional embodiment, multiple superconducting bridging strips are provided, the number of welded conductive blocks is the same as the number of superconducting bridging strips, and an insulating sheet is provided between two adjacent welded conductive blocks.

[0012] Secondly, this utility model also provides a high-temperature superconducting magnet, including a high-temperature superconducting tape joint structure provided in the first aspect above and a plurality of disc coils stacked sequentially along the axial direction.

[0013] Since high-temperature superconducting magnets include high-temperature superconducting tape joint structures, which have the same beneficial effects as high-temperature superconducting tape joint structures, they will not be elaborated here.

[0014] In one optional embodiment, a coil clamping plate is further included on both sides of the plurality of disc coils (100), the coil clamping plate being used to fix and position the plurality of disc coils, the welding conductive block being supported on the coil clamping plate, and a gap space being provided between the welding conductive block and the disc coil.

[0015] In one optional embodiment, the welded conductive block is provided with bolt holes at the positions corresponding to the through holes of the coil clamping plate, and the bolt holes and through holes are used for insulating bolts to pass through; during assembly, at least two of the insulating bolts extend beyond the coil clamping plate through the bolt holes and through holes at their ends facing away from their screw heads, and are tightened with insulating nuts;

[0016] And / or, an epoxy insulating ring is provided in the gap space between the welded conductive block and the disc coil, and the epoxy insulating ring has a through hole in the radial direction, the through hole being used for the lead-out end and lead-in end of the disc coil to pass through and extend to the outside of the epoxy insulating ring.

[0017] In one optional embodiment, the high-temperature superconducting magnet further includes a magnet skeleton, and at least one coil clamping plate is provided on each side of the magnet skeleton along the axial direction. The middle part of the coil clamping plate is provided with a through hole corresponding to the central hole of the magnet skeleton, and the diameter of the through hole is smaller than the diameter of the central hole. A plurality of disc coils are stacked on the outer peripheral surface of the magnet skeleton along the axial direction.

[0018] Thirdly, this utility model also provides a welding apparatus for welding and preparing the high-temperature superconducting strip joint structure provided in the first aspect above, the welding apparatus comprising:

[0019] Workbench;

[0020] A fixture is provided on the worktable. The fixture is used to clamp the high-temperature superconducting magnet in a vertical position and to make the welding conductive block horizontally arranged.

[0021] The welding rod is positioned directly above the welding conductive block and is driven to move vertically by the lifting assembly.

[0022] The welding head is positioned on the end face of the welding machine rod facing the welding conductive block. The welding head is horizontally positioned, and the vertical projection of the welding head falls within the range of the superconducting bridging strip.

[0023] The welding apparatus according to this utility model has at least the following beneficial effects:

[0024] By clamping and fixing the high-temperature superconducting magnet vertically (i.e., vertically) onto a fixture, the top surface of the welding conductive block is arranged parallel to the horizontal direction, allowing the first and second strips to be placed horizontally on the top surface of the welding conductive block. A wide superconducting bridging strip, also parallel to the horizontal direction, covers and connects the axially staggered first and second strips. In preparing the high-temperature superconducting strip joint structure, a first solder layer is first placed between the first strip and the superconducting bridging strip, and also between the second strip and the superconducting bridging strip. Then, the lifting assembly is activated to press down the welding head. After the welding head contacts the superconducting bridging strip, it is heated to a set welding temperature. Under the continuous downward pressure of the lifting assembly, the welding head applies a set welding pressure to the superconducting bridging strip. After a set time of holding at temperature and pressure, the first solder layer melts and flows into the connection gap between the first strip and the superconducting bridging strip, and also into the second strip. In the connection gap between the superconducting bridging strip and the superconducting bridging strip, through wetting and diffusion, the superconducting bridging strip, the first strip, and the second strip are firmly bonded together after the solder solidifies. Throughout the welding process, the downward pressing direction of the welding head is perpendicular to the direction of the first and second strips, ensuring that the lower end face of the welding head is consistent with the direction of the first and second strips. This allows the first and second strips to be in a horizontal state during welding without twisting their direction, reducing damage to the first and second strips and preventing solder loss due to gravity. This improves welding quality and efficiency, thereby ensuring the quality of the high-temperature superconducting strip joint structure. It effectively improves the resistance performance and quality stability of the high-temperature superconducting strip joint structure prepared by this welding device, resulting in high-temperature superconducting magnets equipped with the high-temperature superconducting strip joint structure prepared by this welding device exhibiting low resistance and high mechanical strength. Meanwhile, during the welding process of the high-temperature superconducting strip joint structure, the welding head applies pressure to the whole formed by the first strip, the second strip, and the superconducting bridging strip. The welding conductive block provides stable support for the whole formed by the first strip, the second strip, and the superconducting bridging strip. This effectively avoids the pressure from directly acting on the disc coil during the welding process, which could affect the performance of the disc coil. This ensures that the high-temperature superconducting magnet equipped with the high-temperature superconducting strip joint structure prepared by this welding device has high mechanical strength.

[0025] In one alternative embodiment, the system further includes a linear drive disposed on the worktable, the linear drive having a mounting plate that moves axially, and the lifting assembly disposed on the mounting plate. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 A partial three-dimensional structural diagram of a high-temperature superconducting magnet equipped with the joint structure of this embodiment, along with a welding head and welding rod;

[0028] Figure 2 for Figure 1 Front view structural diagram;

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is a cross-sectional side view of the joint structure in this embodiment.

[0031] Figure 5 This is a partial top view of the joint structure in this embodiment;

[0032] Figure 6 for Figure 5 A schematic diagram of the structure after the superconducting bridging strip has been removed.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100-Disc Coil;

[0035] 210 - First strip, 220 - Second strip, 230 - Superconducting bridging strip, 240 - First solder layer, 250 - Second solder layer, 260 - Third solder layer;

[0036] 300 - Welding conductive block, 310 - First inclined part, 320 - Second inclined part;

[0037] 400-Coil clamping plate;

[0038] 500-insulating sheet;

[0039] 610 - Insulating bolt, 620 - Insulating nut;

[0040] 700 - Epoxy Insulating Ring;

[0041] 810 - Welding rod; 820 - Welding head;

[0042] 900-Cooling copper block. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this embodiment. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this embodiment, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment according to the specific circumstances.

[0046] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0047] According to a first aspect of the present invention, a high-temperature superconducting strip joint structure is provided for use in a high-temperature superconducting magnet. The high-temperature superconducting magnet includes a plurality of disc coils 100 stacked sequentially along the axial direction. A first strip 210 is provided at the output end of one disc coil 100, and a second strip 220 is provided at the input end of the adjacent disc coil 100. The structure includes a welding conductive block 300, which is used to connect the first strip 210 and the second strip 220 of two adjacent disc coils 100, and has a horizontally arranged top surface. The first strip 210 and the second strip 220 are both horizontally arranged on the top surface of the welding conductive block 300 and are staggered along the axial direction. The top surfaces of the first strip 210 and the second strip 220 are at least partially covered by a superconducting bridging strip 230, and a first solder layer 240 is provided between the first strip 210 and the second strip 220 and the superconducting bridging strip 230.

[0048] In this embodiment, the high-temperature superconducting tape joint structure connects the first tape 210 and the second tape 220 of two adjacent disc coils 100 of a vertically arranged (i.e., in a vertical state) high-temperature superconducting magnet through a welding conductive block 300. The top surface of the welding conductive block 300 is arranged parallel to the horizontal direction, so that the first tape 210 at the output end of one disc coil 100 and the second tape 220 at the input end of the adjacent disc coil 100 can be placed horizontally on the top surface of the welding conductive block 300, and connected by a superconducting bridging tape with a relatively large width. 230 covers and connects the first strip 210 and the second strip 220, which are offset along the axial direction, and the superconducting bridging strip 230 is arranged parallel to the horizontal direction. During the process of preparing the high-temperature superconducting strip joint structure of this embodiment by using the welding head 820 to descend vertically, firstly, the first solder layer 240 located between the first strip 210 and the superconducting bridging strip 230, and between the second strip 220 and the superconducting bridging strip 230, is less likely to be lost due to gravity; secondly, the downward pressing direction of the welding head 820 is parallel to the first strip 210 and the second strip 220. The strips 220 are perpendicular to each other, ensuring that the lower end face of the welding head 820 is aligned with the orientation of the first strip 210 and the second strip 220. This allows the first and second strips 210 and 220 to be horizontal during welding without twisting their orientation, reducing damage to them, improving welding quality and efficiency, and thus ensuring the quality of the high-temperature superconducting strip joint structure in this embodiment. This also effectively improves the resistance of the high-temperature superconducting strip joint structure in this embodiment. The performance and quality stability enable the high-temperature superconducting magnet equipped with the high-temperature superconducting tape joint structure of this embodiment to have low resistance and high mechanical strength. In the third aspect, the welding conductive block 300 provides stable support for the whole formed by the first tape 210, the second tape 220 and the superconducting bridging tape 230, which can effectively avoid the pressure directly acting on the disc coil 100 during the welding preparation process and affecting the performance of the disc coil 100, thereby ensuring that the high-temperature superconducting magnet equipped with the high-temperature superconducting tape joint structure of this embodiment has high mechanical strength.

[0049] It should be noted that in this embodiment, the top surface of the welding conductive block 300 is arranged parallel to the horizontal direction, so that the first strip 210, the second strip 220 and the superconducting bridging strip 230 are all placed horizontally on the top surface of the welding conductive block 300. This allows for more uniform and effective pressure application during the welding process when the welding head 820 is driven down by the lifting component to prepare the welding, resulting in a straight joint structure and ensuring that the joint structure is not affected by stress.

[0050] It should be noted that in this embodiment, the welding conductive block 300 is set as a welding copper block. The welding copper block serves to provide a welding platform for the whole formed by the first strip 210, the second strip 220, and the superconducting bridging strip 230. That is, the welding copper block allows the welding head 820 to make better contact with the first strip 210, the second strip 220, and the superconducting bridging strip 230. The welding copper block has good thermal conductivity, so when welding to prepare the joint structure, the solder is heated evenly and can better wet the first strip 210, the second strip 220, and the superconducting bridging strip 230, thus producing a better quality joint structure. After welding, when cooling the coil, the good thermal conductivity of the welding copper block can cool the joint area more fully, preventing the formation of local high temperature areas, resulting in a larger critical current for the strip, lower resistivity, and reduced heat generation.

[0051] It is understood that the axial direction mentioned in the text refers to the axial direction of the high-temperature superconducting magnet. The axial and horizontal directions mentioned in the text are located on the same horizontal plane, and the axial, horizontal, and vertical directions are perpendicular to each other. For ease of description, this embodiment uses... Figure 2 and Figure 4 The first direction, the second direction, and the third direction are described as the axial direction, the horizontal direction, and the vertical direction, respectively.

[0052] It is understandable that the axis of a high-temperature superconducting magnet in a vertical position is perpendicular to the vertical direction.

[0053] It is understandable that, such as Figure 5 and Figure 6 As shown, the projection of the first strip 210 along the axial direction at least partially overlaps with that of the second strip 220; the superconducting bridging strip 230 at least covers the portion of the first strip 210 and the second strip 220 whose projections along the axial direction overlap.

[0054] It should be noted that the first strip 210 is part of the output end of the disc coil 100, and the second strip 220 is part of the input end of the disc coil 100. Both the first strip 210 and the second strip 220 are high-temperature superconducting strips.

[0055] like Figures 2 to 4As shown, in some embodiments, a second solder layer 250 is provided between the first strip 210 and the second strip 220 and the top surface of the welding conductive block 300. With this arrangement, during the welding process of this embodiment, the second solder layer 250 located between the first strip 210 and the welding conductive block 300 and between the second strip 220 and the welding conductive block 300 melts and flows into the connection gap between the first strip 210 and the welding conductive block 300, and into the connection gap between the second strip 220 and the welding conductive block 300, respectively. Through wetting and diffusion, the welding conductive block 300, the first strip 210 and the second strip 220 are firmly bonded together after the solder solidifies. This helps to reduce the joint resistivity of the high-temperature superconducting strip joint structure of this embodiment and reduce heat generation.

[0056] To further improve the resistivity of the high-temperature superconducting tape joint structure in this embodiment, such as Figure 3 As shown, specifically, a third solder layer 260 is provided between the first strip 210 and the second strip 220 along the axial direction.

[0057] It should be noted that the first solder layer 240, the second solder layer 250, and the third solder layer 260 are all lead-tin, lead-bismuth, silver-tin, etc., ensuring that the melting points of the first solder layer 240, the second solder layer 250, and the third solder layer 260 are the same (the melting points are specifically between 130℃ and 200℃, which is relatively low). This allows the entire assembly formed by the first strip 210, the second strip 220, and the superconducting bridging strip 230 to be prepared by welding in only one welding process. The entire assembly formed by the first strip 210, the second strip 220, and the superconducting bridging strip 230 is then fixed to the welding conductive block 300. This can effectively improve the resistance performance and quality stability of the high-temperature superconducting strip joint structure in this embodiment.

[0058] like Figure 4 As shown, in some embodiments, the top of the welding conductive block 300 is planar, and the welding conductive block 300 has a first inclined portion 310 and a second inclined portion 320 at its two ends along the horizontal direction. The first inclined portion 310 is used for overlapping the output end integrally formed with the first strip 210, and the second inclined portion 320 is used for overlapping the input end integrally formed with the second strip 220. Through the transitional setting of the first inclined portion 310 and the second inclined portion 320, the input end and the output end can be tightly attached to the first inclined portion 310 and the second inclined portion 320 respectively, based on the first strip 210 and the second strip 220 being horizontally set on the top surface of the welding conductive block 300, thus avoiding damage to the high-temperature superconducting strip wound into a disc coil 100. It can be understood that the horizontal direction here refers to the tangent direction of the top point of the portion where the projection of the disc coil 100 along the vertical direction overlaps with the welding conductive block 300.

[0059] like Figure 4 As shown, specifically, the first inclined portion 310 and the second inclined portion 320 are symmetrically arranged about the geometric center of the welding conductive block 300 along the second direction. Both the first inclined portion 310 and the second inclined portion 320 extend away from the welding conductive block 300 and extend from the outside to the inside along the radial direction of the disc coil 100. It can be understood that "outer" here refers to the side away from the center of the disc coil 100 along the radial direction of the disc coil 100, and "inner" here refers to the side towards the center of the disc coil 100 along the radial direction of the disc coil 100.

[0060] Specifically, the connection between the first inclined portion 310 and the welded conductive block 300 is smoothly transitioned, and the connection between the second inclined portion 320 and the welded conductive block 300 is also smoothly transitioned.

[0061] Considering that the high-temperature superconducting magnet equipped with the high-temperature superconducting tape joint structure of this embodiment includes at least three disc coils 100, correspondingly, as Figure 1 and Figure 2 As shown, in this embodiment, at least two superconducting bridging strips 230 are also provided, that is, the number of superconducting bridging strips 230 is one less than the number of disc coils 100. The number of welding conductive blocks 300 is the same as the number of superconducting bridging strips 230. An insulating sheet 500 is provided between two adjacent welding conductive blocks 300. The insulating sheet 500 insulates and separates the two adjacent welding conductive blocks 300, ensuring the insulation between the welding conductive blocks 300, preventing current cross-flow between the welding conductive blocks 300, and avoiding short circuit of the disc coil 100.

[0062] Specifically, the insulating sheet 500 is also disposed between two adjacent superconducting bridging strips 230, which is beneficial to improving the insulation performance of the high-temperature superconducting strip joint structure in this embodiment.

[0063] It should be noted that the number of superconducting bridging strips 230 is one less than the number of disc coils 100. This means that if the high-temperature superconducting magnet equipped with the high-temperature superconducting tape joint structure of this embodiment includes three disc coils 100, then the high-temperature superconducting tape joint structure of this embodiment includes two superconducting bridging strips 230, and so on.

[0064] In specific applications, the insulating sheet 500 is made of materials such as G10, aluminum nitride, and Teflon.

[0065] According to a second aspect of the present invention, a high-temperature superconducting magnet is also provided, comprising the high-temperature superconducting strip joint structure provided in the first aspect of the present invention and a plurality of disc coils 100 stacked sequentially along the axial direction. In this embodiment, the high-temperature superconducting magnet connects the first strip 210 and the second strip 220 of two adjacent disc coils 100 of the vertically arranged (i.e., in a vertical position) high-temperature superconducting magnet via a welding conductive block 300. The top surface of the welding conductive block 300 is arranged parallel to the horizontal direction, such that the first strip 210 at the output end of one disc coil 100 and the second strip 220 at the input end of the adjacent other disc coil 100 can be horizontally placed on the top surface of the welding conductive block 300, and connected by a relatively wide superconducting bridging strip 23. The first strip 210 and the second strip 220, which are offset along the axial direction, are covered and connected, and the superconducting bridging strip 230 is arranged parallel to the horizontal direction. During the process of preparing the joint structure of the high-temperature superconducting magnet of this embodiment by using the welding head 820 to descend vertically, firstly, the first solder layer 240 located between the first strip 210 and the superconducting bridging strip 230, and between the second strip 220 and the superconducting bridging strip 230, is less likely to be lost due to gravity; secondly, the downward pressing direction of the welding head 820 is parallel to the first strip 210 and the second strip 220. The two strips 220 are perpendicular to each other, ensuring that the lower end face of the welding head 820 is aligned with the direction of the first strip 210 and the second strip 220. This allows the first strip 210 and the second strip 220 to be horizontal during welding without twisting their direction (i.e., the welding head 820 can apply pressure more evenly and effectively), reducing damage to the first strip 210 and the second strip 220, improving welding quality and efficiency, and thus ensuring the quality of the joint structure of the high-temperature superconducting magnet in this embodiment. This effectively improves the resistance performance and quality stability of the joint structure of the high-temperature superconducting magnet in this embodiment, giving the high-temperature superconducting magnet in this embodiment low resistance and high mechanical strength. Thirdly, the welding conductive block 300 provides stable support for the whole formed by the first strip 210, the second strip 220 and the superconducting bridging strip 230, effectively preventing the pressure from directly affecting the performance of the disc coil 100 during the welding preparation process, thereby ensuring that the high-temperature superconducting magnet in this embodiment has high mechanical strength.

[0066] like Figure 1 and Figure 2As shown, in some embodiments, the high-temperature superconducting magnet also includes coil clamping plates 400 located on both sides of multiple disc coils 100. The coil clamping plates 400 are used to fix and position the multiple disc coils 100. The welding conductive block 300 is supported on the coil clamping plate 400, and a gap space is provided between the welding conductive block 300 and the disc coil 100. With this arrangement, the coil clamping plate 400 provides support for the welding conductive block 300, and the welding conductive block 300 does not contact the disc coil 100. During the process of preparing the joint structure of the high-temperature superconducting magnet of this embodiment by using the welding head 820 to descend in the vertical direction, it is ensured that the pressure on the welding conductive block 300 is transmitted and diffused to the coil clamping plate 400, and basically does not diffuse to the disc coil. This more effectively avoids the pressure directly acting on the disc coil 100 during the welding preparation of the joint structure, thus preventing the performance of the disc coil 100 from being affected.

[0067] It should be noted that the coil clamping plates 400 located on both sides of the multiple disc coils 100 refer to the fact that the entire structure formed by the multiple disc coils 100 has coil clamping plates 400 on both sides along the axial direction, which better fixes and positions the multiple disc coils 100; there is at least one coil clamping plate 400 on each side, which can better support the welding conductive block 300 and is more conducive to avoiding the direct pressure on the disc coils 100 during the welding and preparation of the joint structure, thus avoiding the impact on the performance of the disc coils 100.

[0068] like Figure 1 and Figure 2 As shown, in some embodiments, the welded conductive block 300 is provided with bolt holes at the positions corresponding to the through holes of the coil clamping plate 400. The bolt holes and through holes are used for the insulating bolts 610 to pass through. During assembly, at least two insulating bolts 610 are used, with one end facing away from its screw head passing through the through hole of one side of the coil clamping plate 400, and then passing through the bolt holes in sequence, and then through the through hole of the other side of the coil clamping plate 400, extending to the outside of the coil clamping plate 400 and tightened with insulating nuts 620. This causes multiple welded conductive blocks 300 and insulating sheets 500 to press against each other and be fixed between the two coil clamping plates 400. This helps to enhance the reliability and durability of the joint structure of the high-temperature superconducting magnet in this embodiment, and avoids the problems of high heat generation, magnetic field not reaching the expected level, and difficulty in locating fault points in traditional joint structures.

[0069] It should be noted that both the insulating bolt 610 and the insulating nut 620 are made of insulating and strong materials such as G10, Teflon, and nylon. On the one hand, this ensures the insulation between the welded conductive blocks 300, preventing current cross-flow between them and avoiding short circuits in the disc coil 100. On the other hand, the shank of the insulating bolt 610 can support the welded conductive blocks 300, which can improve the positioning effect and also transmit and diffuse the pressure on the welded conductive blocks 300 to the two coil clamping plates 400 during the welding process of the joint structure. This can effectively prevent the pressure from directly affecting the disc coil 100 and its performance during the welding process of the joint structure.

[0070] It should be noted that the coil clamping plate 400 has at least two through holes along the axial direction, and the corresponding welding conductive block 300 and insulating sheet 500 have at least two bolt holes.

[0071] In practical applications, the insulating bolt 610 can be replaced by an insulating rod, with threaded portions on the outer walls of both ends of the insulating rod that match the insulating nut 620.

[0072] Understandably, the insulating bolts 610 and insulating nuts 620 can be used to assemble and fix multiple welded conductive blocks 300 and multiple insulating sheets 500 between the coil clamping plates 400 on both sides, which is simple to operate.

[0073] like Figure 2 and Figure 4 As shown, in some embodiments, an epoxy insulating ring 700 is provided in the gap space between the welding conductive block 300 and the disc coil 100. The epoxy insulating ring 700 has a through hole running radially through it, which allows the lead-out and lead-in ends of the disc coil 100 to pass through and extend to the outside of the epoxy insulating ring 700. By setting it in this way, the epoxy insulating ring 700 isolates the welding conductive block 300 and the disc coil 100 (that is, isolates the joint structure from the disc coil 100), which not only ensures that the welding temperature will not damage the disc coil 100 when welding the joint structure, but also enhances the stress resistance on the outside of the disc coil 100, optimizes the stress distribution on the outside of the disc coil 100, and is beneficial to improving the insulation performance and mechanical strength of the high-temperature superconducting tape joint structure of this embodiment.

[0074] Specifically, the bottom surface of the welding conductive block 300 facing the epoxy insulating ring 700 is set as an arc surface, which matches the outer surface of the epoxy insulating ring 700, so that the welding conductive block 300 is tightly attached to the outer surface of the epoxy insulating ring 700.

[0075] In some embodiments, the high-temperature superconducting magnet further includes a magnet skeleton, with at least one coil clamping plate 400 provided on each side of the magnet skeleton along the axial direction. A through hole is provided in the center of the coil clamping plate 400 corresponding to the central hole of the magnet skeleton, and the diameter of the through hole is smaller than the diameter of the central hole. Multiple disc-shaped coils 100 are stacked axially on the outer peripheral surface of the magnet skeleton. With this configuration, when the high-temperature superconducting magnet of this embodiment is clamped vertically on the fixture of the welding device, the inner wall of the through hole of the coil clamping plate 400 abuts against the outer peripheral surface of the fixture, while the inner wall of the central hole of the magnet skeleton does not contact the outer peripheral surface of the fixture. This ensures that the pressure on the welding conductive block 300 during the welding process is transmitted to the fixture via the coil clamping plate 400, and the magnet skeleton is essentially unaffected by force throughout the entire welding process.

[0076] like Figure 1 and Figure 2 As shown, in some embodiments, each coil clamping plate 400 is provided with a cooling copper block 900 between it and the nearest welding conductive block 300 along the axial direction, and each cooling copper block 900 is provided with an insulating sheet 500 on both sides along the axial direction; the inlet wire of the high-temperature superconducting magnet is welded to one of the cooling copper blocks 900, and the outlet wire of the high-temperature superconducting magnet is welded to the other cooling copper block 900; each cooling copper block 900 is connected to a copper braided cooling strip or other existing mature cooling structure to cool the outlet wire and the inlet wire of the high-temperature superconducting magnet.

[0077] In specific applications, the disc coil 100 in this embodiment is configured as a double disc coil.

[0078] Specifically, the cooling copper block 900 is also used to connect external current leads, so that current passes through the cooling copper block 900 into the disc coil 100.

[0079] It should be noted that, Figure 2 The middle part is a high-temperature superconducting magnet formed by welding five disc coils 100 together. This high-temperature superconducting magnet has an inlet wire end and an outlet wire end. The inlet wire end of the high-temperature superconducting magnet refers to... Figure 2 The inlet wire of the disc coil 100 located on the far left along the axial direction, and the outlet wire of the high-temperature superconducting magnet refer to... Figure 2 The lead wire end of the disc coil 100 located on the far right along the axial direction.

[0080] According to a third aspect of the present invention, a welding apparatus is also provided for welding the high-temperature superconducting strip joint structure provided in the first aspect of the present invention. The welding apparatus includes a worktable and a welding rod 810. The worktable is provided with a clamp for clamping a high-temperature superconducting magnet in a vertical position, and for arranging the welding conductive block 300 horizontally. The welding rod 810 is located directly above the welding conductive block 300 and is driven to move vertically by a lifting assembly. The welding head 820 is located on the end face of the welding rod 810 facing the welding conductive block 300. The welding head 820 is horizontally positioned, and its vertical projection falls within the range of the superconducting bridging strip 230.

[0081] In this embodiment, the welding apparatus clamps and fixes the high-temperature superconducting magnet in a vertical position (i.e., upright) onto a fixture. At this time, the top surface of the welding conductive block 300 is arranged parallel to the horizontal direction, allowing the first strip 210 and the second strip 220 to be placed horizontally on the top surface of the welding conductive block 300. The first strip 210 and the second strip 220, which are offset axially, are covered and connected by a wide superconducting bridging strip 230, which is arranged parallel to the horizontal direction. When welding to prepare the high-temperature superconducting strip joint structure, the first strip 210 and... A first solder layer 240 is provided between the superconducting bridging strips 230 and between the second strip 220 and the superconducting bridging strip 230. Then, the lifting assembly is activated to press down the welding head 820. After the welding head 820 abuts against the superconducting bridging strip 230, it is heated to a set welding temperature. Then, under the continuous downward pressure of the lifting assembly, the welding head 820 applies a set welding pressure to the superconducting bridging strip 230. After a set time of heat and pressure holding, the first solder layer 240 melts and flows into the connection gap between the first strip 210 and the superconducting bridging strip 230, and also flows into the second strip 220. In the connection gap between the superconducting bridging strip 20 and the superconducting bridging strip 230, through wetting and diffusion, the superconducting bridging strip 230, the first strip 210, and the second strip 220 are firmly bonded together after the solder solidifies. Throughout the welding process, the downward pressing direction of the welding head 820 is perpendicular to the orientation of the first strip 210 and the second strip 220, ensuring that the lower end face of the welding head 820 is aligned with the orientation of the first strip 210 and the second strip 220. This achieves bonding of the first strip 210 and the second strip 220 without twisting their orientation. The welding process is carried out in a horizontal position (i.e., the welding head 820 can apply pressure more evenly and effectively), which can reduce damage to the first strip 210 and the second strip 220, and avoid the loss of solder due to gravity, thereby improving the welding quality and welding efficiency. This ensures the quality of the high-temperature superconducting strip joint structure and effectively improves the resistance performance and quality stability of the high-temperature superconducting strip joint structure prepared by the welding device of this embodiment. As a result, the high-temperature superconducting magnet assembled with the high-temperature superconducting strip joint structure prepared by the welding device of this embodiment has low resistance and high mechanical strength performance. Meanwhile, during the welding process of the high-temperature superconducting strip joint structure, the welding head 820 applies pressure to the whole formed by the first strip 210, the second strip 220, and the superconducting bridging strip 230. The welding conductive block 300 provides stable support for the whole formed by the first strip 210, the second strip 220, and the superconducting bridging strip 230. This effectively avoids the pressure from directly acting on the disc coil 100 during the welding process, which could affect the performance of the disc coil 100. This ensures that the high-temperature superconducting magnet equipped with the high-temperature superconducting strip joint structure prepared by the welding device of this embodiment has high mechanical strength performance.

[0082] Specifically, the lifting assembly is configured as a servo electric cylinder. A pressure sensor is installed between the moving end of the servo electric cylinder and the welding rod 810. Both the pressure sensor and the servo electric cylinder are connected to the control system. The pressure sensor monitors the pressure applied by the welding head 820 to the entire structure consisting of the first strip 210, the second strip 220, the superconducting bridging strip 230, and the first solder layer 240. The measured pressure value is transmitted to the control system. When the measured pressure value is less than the set welding pressure value, a first signal is transmitted to increase the loading of the servo electric cylinder. When the measured pressure value is greater than the set welding pressure value, a second signal is transmitted to decrease the loading of the servo electric cylinder. This achieves precise control of the welding pressure, thereby ensuring the quality of the joint structure obtained by welding.

[0083] In practical applications, the lifting component can also be set as a linear motor, cylinder, etc.

[0084] Specifically, a heating rod is installed inside the welding head 820.

[0085] Specifically, the fixture includes a support vertically mounted on the workbench, a support column on one side of the support along the axial direction, the support column being used to insert into the through hole of the coil clamping plate 400, and an external threaded part on the end of the support column away from the support for threaded connection of the clamping nut. When the high-temperature superconducting magnet is clamped and fixed on the fixture in a vertical state, the high-temperature superconducting magnet in a vertical state is first inserted into the support column, so that the coil clamping plate 400 of the high-temperature superconducting magnet that is relatively close to the support abuts against the support. Then, the clamping nut is tightened into the external threaded part until the clamping nut abuts against the side wall of the coil clamping plate 400 of the high-temperature superconducting magnet that is relatively far away from the support, thereby clamping and fixing the high-temperature superconducting magnet in a vertical state on the fixture, and making the welding conductive block 300 located at the top and parallel to the bottom end face of the welding head 820.

[0086] Considering that the high-temperature superconducting magnet equipped with the high-temperature superconducting strip joint structure provided in the first aspect of this embodiment includes at least three disc coils 100, that is, the high-temperature superconducting strip joint structure provided in the first aspect of this embodiment includes multiple integrals formed by first strip 210, second strip 220 and superconducting bridging strip 230 arranged sequentially along the axial direction, in order to achieve the welding preparation of multiple integrals formed by first strip 210, second strip 220 and superconducting bridging strip 230 of the high-temperature superconducting strip joint structure provided in the first aspect of this embodiment with only one clamping, and to improve welding efficiency, the welding device further includes a linear driver disposed on the worktable, the linear driver being provided with a mounting plate that moves along the axial direction, and a lifting assembly disposed on the mounting plate. Because the welding head 820 can be driven to move vertically by the lifting assembly and axially by the linear actuator, after the welding head 820 completes the welding of one of the integrals formed by the first strip 210, the second strip 220 and the superconducting bridging strip 230 and is driven to rise by the lifting assembly, the linear actuator is then activated to move the welding head 820 axially until the welding head 820 is directly above another integral formed by the first strip 210, the second strip 220 and the superconducting bridging strip 230 to be welded. Then the lifting assembly is activated to lower the welding head 820 to prepare the integral formed by the first strip 210, the second strip 220 and the superconducting bridging strip 230. The above actions are repeated until all integrals formed by the first strip 210, the second strip 220 and the superconducting bridging strip 230 are welded.

[0087] In practical applications, the linear actuator can be set as an electric cylinder, pneumatic cylinder, linear motor, or ball screw nut assembly, as long as it can accurately drive the mounting plate to move back and forth along the axial direction.

[0088] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the appended invention.

Claims

1. A high-temperature superconducting tape joint structure, applied to a high-temperature superconducting magnet, the high-temperature superconducting magnet comprising a plurality of disc coils (100) stacked sequentially along the axial direction, wherein a first tape (210) is provided at the output end of one disc coil (100), and a second tape (220) is provided at the input end of the adjacent disc coil (100); characterized in that, The device includes a welding conductive block (300) for connecting a first strip (210) and a second strip (220) of two adjacent disc coils (100), and has a horizontally arranged top surface; the first strip (210) and the second strip (220) are both horizontally arranged on the top surface of the welding conductive block (300) and are staggered along the axial direction; the top surfaces of the first strip (210) and the second strip (220) are at least partially covered by a superconducting bridging strip (230), and a first solder layer (240) is provided between the first strip (210) and the second strip (220) and the superconducting bridging strip (230).

2. The high-temperature superconducting tape joint structure according to claim 1, characterized in that, A second solder layer (250) is provided between the first strip (210) and the second strip (220) and the top surface of the welding conductive block (300); And / or, a third solder layer (260) is provided between the first strip (210) and the second strip (220) along the axial direction.

3. The high-temperature superconducting tape joint structure according to claim 1, characterized in that, The welding conductive block (300) has a first inclined portion (310) and a second inclined portion (320) at both ends along the horizontal direction; the first inclined portion (310) is used to overlap the outgoing end integrally formed with the first strip (210), and the second inclined portion (320) is used to overlap the incoming end integrally formed with the second strip (220).

4. The high-temperature superconducting tape joint structure according to claim 1, characterized in that, Multiple superconducting bridging strips (230) are provided, and the number of welding conductive blocks (300) and superconducting bridging strips (230) is the same. An insulating sheet (500) is provided between two adjacent welding conductive blocks (300).

5. A high-temperature superconducting magnet, characterized in that, It includes the high-temperature superconducting tape joint structure according to any one of claims 1 to 4 and a plurality of disc coils (100) stacked sequentially along the axial direction.

6. A high-temperature superconducting magnet according to claim 5, characterized in that, It also includes coil clamping plates (400) located on both sides of the plurality of disc coils (100), the coil clamping plates (400) on both sides are used to fix and position the plurality of disc coils (100), the welding conductive block (300) is supported on the coil clamping plate (400), and a gap space is provided between the welding conductive block (300) and the disc coil (100).

7. A high-temperature superconducting magnet according to claim 6, characterized in that, The welding conductive block (300) is provided with bolt holes at the positions corresponding to the through holes of the coil clamping plate (400). The bolt holes and through holes are used for insulating bolts (610) to pass through. During assembly, at least two of the insulating bolts (610) extend through the bolt holes and through holes to the outside of the coil clamping plate (400) with one end away from its screw head, and are tightened with insulating nuts (620). And / or, an epoxy insulating ring (700) is provided in the gap space between the welding conductive block (300) and the disc coil (100), the epoxy insulating ring (700) having a through hole in the radial direction, the through hole being used for the lead-out end and lead-in end of the disc coil (100) to pass through and extend to the outside of the epoxy insulating ring (700).

8. A high-temperature superconducting magnet according to claim 6 or 7, characterized in that, The high-temperature superconducting magnet also includes a magnet skeleton, and at least one coil clamping plate (400) is provided on each side of the magnet skeleton along the axial direction. The coil clamping plate (400) has a through hole in the middle corresponding to the central hole of the magnet skeleton. The diameter of the through hole is smaller than the diameter of the central hole. Multiple disc coils (100) are stacked on the outer peripheral surface of the magnet skeleton along the axial direction.

9. A welding apparatus, used for welding and preparing the high-temperature superconducting strip joint structure according to any one of claims 1 to 4, characterized in that, The welding apparatus includes: Workbench; A fixture is provided on the worktable. The fixture is used to clamp the high-temperature superconducting magnet in a vertical position and to make the welding conductive block (300) horizontally arranged. The welding rod (810) is positioned directly above the welding conductive block (300) and is driven to move vertically by the lifting assembly; A welding head (820) is disposed on the end face of the welding machine rod (810) facing the welding conductive block (300). The welding head (820) is horizontally disposed, and the projection of the welding head (820) in the vertical direction falls within the range of the superconducting bridging strip (230).

10. A welding apparatus according to claim 9, characterized in that, It also includes a linear drive disposed on the worktable, the linear drive having a mounting plate that moves axially, and the lifting assembly disposed on the mounting plate.

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