Auxiliary welding device for outer joint of superconducting magnet

Abstract

The invention discloses a superconducting magnet outer joint welding auxiliary device, which belongs to the technical field of superconducting magnets, and comprises a lifting platform, a concave base, a concave slide way, two groups of bent clamp assemblies, an elastic component, a fastening screw rod and a threaded hole, a concave base is installed above the lifting table, a concave slide way is arranged in the concave base, the concave slide way and the two sets of bent clamp assemblies are installed in a nested and combined mode, and each set of bent clamp assembly is screwed and fixed with a superconducting tape through a screw; the pre-tightening spring is arranged between one side of the concave slide way and one side of the concave base and is matched with the concave slide way to provide tensioning force for the superconducting tape; a threaded hole is formed in the middle of the other side of the concave base. The fastening screw penetrates through the threaded hole and then applies pre-tightening force to the concave slide way. The problems that in the welding process of the high-temperature superconducting magnet, the tensile force needs to be manually provided, and the joint resistance is too large due to the fact that the pre-tightening force is not enough manually provided are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of superconducting magnets, and in particular relates to a superconducting magnet external joint welding auxiliary device. Background Art

[0002] In recent years, the second generation of high-temperature superconducting tapes cannot be produced over long distances due to the limitations of production technology and production scale. In large superconducting magnets (such as ITER nuclear fusion devices and high-field MRI magnets), due to the limited manufacturing length of superconducting tapes, seamless electrical connections between tapes need to be achieved through external joints. The performance of high-temperature superconducting external joints directly affects the overall stability of the magnet system. High-temperature superconducting external joints are the key technology for achieving electrical connections of high-temperature superconducting materials (such as YBCO, BSCCO, etc.). They are widely used in superconducting magnets, superconducting cables, superconducting current limiters and other equipment. Their performance directly affects the overall stability, efficiency and reliability of the superconducting system. The external joints of superconducting magnets need to be manually tightened during welding. The tightening force provided by humans is often not enough to make the superconducting tape and the external joint fully contact, resulting in excessive joint resistance of the superconducting magnet, and the superconducting tape is easily affected by various external mechanical stresses and bent and damaged, resulting in reduced fatigue life, changes in critical current density and critical temperature, and weakened bonding between superconducting tape layers. Summary of the invention

[0003] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0004] A superconducting magnet external joint welding auxiliary device comprises: a lifting platform, a concave base, a concave slideway, two groups of bent clamp assemblies, an elastic component, a fastening screw, and a threaded hole; the concave base is installed above the lifting platform, the concave slideway is arranged in the concave base, the concave slideway and the two groups of bent clamp assemblies are nested and assembled, and each group of bent clamp assemblies is tightened and fixed with a superconducting tape by screws; a pre-tightening spring is arranged between one side of the concave slideway and one side of the concave base, and cooperates with the concave slideway to provide tensioning force for the superconducting tape; a threaded hole is arranged in the middle of the other side of the concave base; and the fastening screw applies a pre-tightening force to the concave slideway after passing through the threaded hole.

[0005] The present invention has the following beneficial effects:

[0006] The present invention tightens the superconducting magnet strip through the bent clamp assembly to provide tension for the superconducting magnet outer joint, which can reduce the joint resistance generated by the superconducting magnet outer joint during welding, thereby reducing heat loss, improving magnetic field stability and uniformity, and enhancing the thermal stability of the magnet. Reducing the joint resistance can reduce the refrigeration load and improve the overall efficiency of the system.

[0007] The present invention can prevent the superconducting tape from being bent and damaged by setting a bending clamp assembly, reduce the influence of various external mechanical stresses on the tape, thereby avoiding problems such as reduced fatigue life of the superconducting tape, changes in critical current density and critical temperature, and weakening of interlayer bonding of the superconducting tape.

[0008] The invention can adjust the distance between two groups of curved clamp components through the special structure of the concave base, the concave slideway and the curved clamp component, so as to adapt to the superconducting magnets assembled by winding coils of different sizes.

[0009] The invention can vertically adjust the height of the bent clamp assembly through a lifting platform to adapt to superconducting magnets assembled from coils of different heights, so that the device of the invention is suitable for welding external joints of various superconducting magnets.

[0010] The present invention can push the concave slideway through the concave base by rotating the fastening screw to compress the preload spring.

[0011] When the bent clamp assembly fixes the superconducting tape, a tensile force is provided to the high-temperature superconducting tape so that the high-temperature superconducting tape can fully contact with the outer joint of the superconducting magnet.

[0012] The present invention makes it easier to weld the external joints of the magnet, solves the problem of excessive joint resistance caused by the need for manual tension during the welding process of the high-temperature superconducting magnet and insufficient manual pre-tightening force, fills the gap in auxiliary welding of the external joints, and provides a guarantee for the stable operation of the superconducting magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of the superconducting magnet external joint welding auxiliary device of the present invention, wherein 1-lifting platform base, 2-lifting platform side rod, 3-concave base, 4-concave slideway, 5-bent clamp assembly, 8-threaded hole;

[0014] Figure 2 It is a side schematic diagram of the superconducting magnet external joint welding auxiliary device of the present invention, wherein 1-lifting platform base, 2-lifting platform side rod, 3-concave base, 4-concave slideway, 5-bent clamp assembly, 6-preload spring;

[0015] Figure 3 It is a schematic diagram of the bent clamp assembly of the superconducting magnet external joint welding auxiliary device of the present invention, wherein 5-bent clamp assembly;

[0016] Figure 4 It is a schematic diagram of the fastening screw of the superconducting magnet external joint welding auxiliary device of the present invention, wherein 7 is the fastening screw;

[0017] Figure 5It is a schematic diagram of the auxiliary welding strip of the superconducting magnet external joint welding auxiliary device of the present invention, wherein 3 is a concave base, 4 is a concave slide, 5 is a bent clamp assembly, 6 is a pre-tightening spring, 7 is a fastening screw, and 9 is a superconducting strip. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] The purpose of the present invention is to address the gaps in the prior art and provide an auxiliary welding structure for the external joints of a superconducting magnet. During the welding process of the superconducting joints, it is necessary to provide tensioning force to the superconducting tapes on both sides to ensure their full contact, thereby solving the problem of large joint resistance due to insufficient welding contact.

[0020] To achieve the above purpose, if Figure 1 , Figure 2 , Figure 5 As shown, the superconducting magnet external joint welding auxiliary device of the present invention comprises: a lifting platform, a concave base 3, a concave slide 4, two groups of bent clamp assemblies 5, an elastic component (i.e., a preload spring 6), a tightening screw 7, and a threaded hole 8. Among them, each group of bent clamp assemblies 5 is composed of a large clamp block and a small clamp block, and the upper parts of the large clamp block and the small clamp block are both set as a quarter-track type G10 block, and the outer diameter of the small clamp block is the same as the inner diameter of the large clamp block, and the two are assembled against each other. A concave base 3 is installed above the lifting platform, and a concave slide 4 is arranged in the concave base 3. The concave slide 4 and the two groups of bent clamp assemblies 5 are nested and assembled, and the bent clamp assemblies 5 are screwed to fix the superconducting tape 9, and the small clamp block and the large clamp block of the bent clamp assembly 5 clamp the superconducting tape 9.

[0021] Furthermore, the lifting platform includes two groups of lifting platform side rods 2 and two lifting platform bases 1 arranged on the inner sides above and below the two groups of lifting platform side rods 2. Each group of lifting platform side rods 2 includes two rods of the same length, cross-assembled in the middle, and rotatably connected. Sliding grooves are respectively arranged on the front and rear sides of the lifting platform on the same side of the two lifting platform bases 1, and sliding rods are respectively arranged in the two sliding grooves. The sliding rods are fixed to one end of the rods of the lifting platform side rods 2 by clamping or by other means, and the other end of the rods of the lifting platform side rods 2 is rotatably connected to the lifting platform base 1 on the opposite side. The sliding rods mechanically move in the sliding grooves to realize the adjustment of the lifting of the concave base 3. The present invention can also adopt lifting platforms with other structures, as long as the lifting platforms can enable the concave base 3 to realize the lifting function.

[0022] Further, such as Figure 3As shown, the upper part of the large clamp block or the small clamp block of each group of bending clamp assemblies 5 is set as a bending G10 pressure block, and the lower part is set as a rectangular protrusion. The sizes of the rectangular protrusions of the large clamp block or the small clamp block are the same. After the large clamp block or the small clamp block is abutted, the two rectangular protrusions are embedded in the groove of the concave slide 4 and match the groove of the concave slide 4.

[0023] Furthermore, Figure 5 As shown, two springs with preloaded force, namely, preloaded springs 6, are arranged on one side of the concave slideway 4. The two preloaded springs 6 cooperate with the concave slideway 4 to provide tension for the superconducting tape 9. The superconducting tape 9 is clamped by the curved clamp assembly 5 on the concave slideway 4. The two groups of curved clamp assemblies 5, the large clamp block and the small clamp block of each group are interlocked (assembled close to each other), and the superconducting tape 9 is placed between the two groups. The rectangular convex blocks of the lower half of the large clamp block and the small clamp block of each group of curved clamp assemblies 5 are provided with threaded holes, and the superconducting tape 9 is clamped by tightening the screws and penetrating the two threaded holes at the same time.

[0024] The concave base 3 is fixed on the lifting platform, the curved clamp assembly 5 and the concave slide 4 are engaged, and the concave slide 4 is located in the concave base 3. One side of the two preload springs 6 is respectively fixed on one side of the concave base 3, and the other side of the two preload springs 6 abuts against one side of the concave slide 4, and the other side of the concave slide 4 abuts against the other side of the concave base 3. A threaded hole 8 is provided in the middle of the other side of the concave base 3. The tightening screw 7 is as shown in FIG. Figure 4 As shown, after the tightening screw 7 passes through the threaded hole 8, a pre-tightening force is applied to the concave slideway 4, and the pre-tightening force provided by the two pre-tightening springs 6 to the superconducting tape 9 fixed on the bent clamp assembly 5 is adjusted. Among them, the pre-tightening spring 6 can be set to one or two, or to other numbers, such as three to five, and other elastic devices besides springs can be used.

[0025] Furthermore, the bending fixture assembly 5 is made of G10 material or other suitable materials. The special bending structure can prevent the superconducting tape from bending and causing it to be subjected to mechanical stress to produce microcracks, dislocations and other defects, thereby affecting the overall performance of the superconducting tape.

[0026] Furthermore, the lifting platform is 100mm long, 45mm wide or other sizes, and the height is adjustable; the inner diameters of the large and small blocks of the bending clamp assembly 5 are 15mm and 10mm respectively, and the thickness is 5mm. The lower part is a cube or a rectangular block of other sizes with a length of 5mm, a width of 5mm, and a height of 5mm; the groove width of the concave base 3 is 30mm, and the groove width of the concave slide 4 is 5mm; the pre-loaded spring is 5mm long, and the fastening screw is 30mm long. The pre-loaded spring and the fastening screw can be of other lengths and can be set according to actual needs.

[0027] The lifting platform base 1 and the lifting platform side rod 2 are made of stainless steel, the concave base 3 is made of G10 material, the concave slide 4 is made of G10 material, the preload spring 6 is made of carbon steel material, and the fastening screw 7 is made of stainless steel material. The above components can also use other suitable materials. The superconducting tape 9 is a ReBCO second-generation high-temperature superconducting tape, and can also be other high-temperature superconducting tapes.

[0028] Further, such as Figure 5 As shown, when the outer joint of the superconducting magnet is welded, the double pancake coils in the superconducting magnet each extend a superconducting tape 9, and the outer joint of the superconducting magnet requires two tapes to provide a pre-tightening force for it, so that the two tapes can be fixed and fully contact the outer joint. The upper parts of the large and small clamping blocks of the bending clamp assembly 5 are both set as a quarter-track type G10 block, which is responsible for smoothly fitting the superconducting tape 9 to prevent it from bending. The lower parts of the large and small clamping blocks of the bending clamp assembly 5 are both set as a rectangular block with threaded holes, and the screws are responsible for pressing and fixing the superconducting tape; the lower parts of the large and small clamping blocks are embedded in the groove of the concave slide 4, and the spacing between the two sets of bending clamp assemblies 5 can be adjusted according to the width of the magnet. After the superconducting tape 9 is clamped, a pre-tightening force needs to be provided, and the pre-tightening spring 6 is continuously compressed by rotating the tightening screw 7 through the threaded hole 8 in the middle of one side of the concave base 3. The superconducting tape 9 is straightened and tightened so that the external joint and the superconducting tape 9 are in full contact, avoiding the problem of high joint resistance caused by insufficient contact during welding. The following is a clear and complete description of the technical solution in the embodiment of the present invention. It should be clear that the described embodiments are only partial examples of the present invention and do not cover all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should be included in the protection scope of the present invention.

[0029] It should be pointed out that in the specification, claims and the above-mentioned drawings of the present application, the terms "first", "second", etc. are only used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that, where appropriate, the data corresponding to these terms can be replaced with each other to better describe the embodiments of the present application. In addition, the terms "including", "having" and their various variations are intended to express a non-exclusive inclusion relationship. For example, a process, method, system, product or device that includes a series of steps or units is not limited to those steps or units that are explicitly listed, and can also cover other steps or units that are not explicitly listed but are inherent to these processes, methods, products or devices.

[0030] In this application, the positions or positional relationships represented by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. are determined based on the positions or positional relationships shown in the accompanying drawings. The use of these terms is mainly to more clearly describe the present application and its embodiments, and is not intended to limit the devices, elements or components involved to have specific positions, or to be constructed and operated according to specific positions.

[0031] In addition, some of the above terms may have other meanings besides being used to indicate orientation or positional relationships. For example, in some cases, the term "on" may also be used to indicate a certain dependency or connection relationship. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific context. At the same time, the terms "installation", "setting", "provided with", "connection", "connected", "socketing", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

Claims

1. A superconducting magnet external joint welding auxiliary device, characterized in that: include: A lifting platform, a concave base (3), a concave slideway (4), two groups of bent clamp assemblies (5), an elastic component (6), a tightening screw (7), and a threaded hole (8); the concave base (3) is installed above the lifting platform, the concave slideway (4) is arranged inside the concave base (3), the concave slideway (4) and the two groups of bent clamp assemblies (5) are nested and assembled, and each group of bent clamp assemblies (5) is tightened and fixed with a superconducting tape (9) by screws; a preload spring (6) is arranged between one side of the concave slideway (4) and one side of the concave base (3), and cooperates with the concave slideway (4) to provide a tensioning force for the superconducting tape (9); a threaded hole (8) is arranged in the middle of the other side of the concave base (3); and the tightening screw (7) passes through the threaded hole (8) to apply a preload force to the concave slideway (4).

2. The superconducting magnet external joint welding auxiliary device according to claim 1, characterized in that: Each set of bending clamp components (5) is composed of a large clamp block and a small clamp block. The upper parts of the large clamp block and the small clamp block are both configured as a quarter-track block, and the outer diameter of the small clamp block is the same as the inner diameter of the large clamp block. The two clamp blocks are assembled against each other to clamp the superconducting tape (9); the lower parts are both configured as rectangular convex blocks. The rectangular convex blocks of the large clamp block or the small clamp block have the same size. After the large clamp block or the small clamp block is assembled against each other, the two rectangular convex blocks are embedded in the groove of the concave slideway (4) and match the groove of the concave slideway (4).

3. The superconducting magnet external joint welding auxiliary device according to claim 2, characterized in that: The rectangular parallelepiped protrusions at the lower parts of the large clamp block and the small clamp block of each set of bent clamp components (5) are provided with threaded holes, and the superconducting tape (9) is clamped by tightening a screw that penetrates the two threaded holes at the same time.

4. The superconducting magnet external joint welding auxiliary device according to claim 1, characterized in that: The lifting platform comprises two groups of lifting platform side rods (2) and two lifting platform bases (1) arranged on the inner sides above and below the two groups of lifting platform side rods (2); wherein each group of lifting platform side rods (2) comprises two rods of the same length, which are cross-assembled in the middle and rotatably connected; sliding grooves are respectively arranged on the front side and the rear side of the lifting platform on the same side of the two lifting platform bases (1), and sliding rods are respectively arranged in the two sliding grooves, the sliding rods are fixed to one end of the rods of the lifting platform side rods (2) by clamping or by other means, and the other end of the rods of the lifting platform side rods (2) is rotatably connected to the lifting platform base (1) on the opposite side; the sliding rods mechanically move in the sliding grooves to achieve the adjustment of the lifting and lowering of the concave base (3).

5. The superconducting magnet external joint welding auxiliary device according to claim 2, characterized in that: The large clamp block and the small clamp block are both configured as G10 blocks or are made of other suitable materials.

6. The superconducting magnet external joint welding auxiliary device according to claim 1, characterized in that: The elastic component (6) is configured as a preloaded spring.

7. The superconducting magnet external joint welding auxiliary device according to claim 6, characterized in that: The concave base (3) is fixed on the lifting platform, and one or two preload springs (6) are provided. One side of the one or two preload springs (6) is respectively fixed on one side of the concave base (3), and the other side abuts against one side of the concave slideway (4), and the other side of the concave slideway (4) abuts against the other side of the concave base (3).

8. The superconducting magnet external joint welding auxiliary device according to claim 6, characterized in that: Three to five preload springs (6) are provided, one side of each preload spring (6) is fixed to one side of the concave base (3), the other side abuts against one side of the concave slideway (4), and the other side of the concave slideway (4) abuts against the other side of the concave base (3).

9. The superconducting magnet external joint welding auxiliary device according to claim 1, characterized in that: The superconducting tape (9) is a ReBCO second generation high temperature superconducting tape.

10. The superconducting magnet external joint welding auxiliary device according to claim 2 or 3, characterized in that: The lower parts of the large clamp block and the small clamp block of each set of bending clamp components (5) are cubes or rectangular blocks of other sizes with a length of 5 mm, a width of 5 mm and a height of 5 mm.

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