Bobbin and winding device for heat treatment of superconducting wire

Abstract

The utility model discloses a bobbin and a winding device used for superconducting wire heat treatment, the bobbin comprises a first support plate, the first support plate is provided with a first fixing assembly, and the first fixing assembly is used for fixing a first end of a wire; the second supporting plate is provided with a second fixing assembly, the second fixing assembly is used for fixing a second end, opposite to the first end, of the wire, and the diameter of the second supporting plate is larger than that of the first supporting plate; the wire winding plate is of a table-shaped hollow structure with two through sides and is used for winding a wire, the wire winding plate comprises a first side edge and a second side edge which are oppositely arranged, the first side edge is connected with the first supporting plate, and the second side edge is connected with the second supporting plate. According to the utility model, the wire shaft can be vertically placed in the heat treatment process of the wire, so that the wire is prevented from sliding down after being heated and expanded in the heat treatment process to cause wire adhesion.

Description

Technical Field

[0001] The utility model relates to the technical field of superconducting wire heat treatment, in particular to a bobbin and a winding device for superconducting wire heat treatment. Background Art

[0002] Low-temperature superconducting materials, with their unique physical properties and broad application prospects, have become crucial materials in scientific research and industrial manufacturing. Their application is particularly indispensable in large-scale scientific facilities and high-end medical equipment. Niobium-tin (Nb3Sn) superconducting wire, a high-performance low-temperature superconducting material, has become a key material in the commercialization of low-temperature superconductivity due to its high critical current density.

[0003] Nb3Sn superconducting wire, with its unique superconducting properties, has been widely used in various fields. In large scientific facilities such as particle accelerators and fusion reactors, Nb3Sn superconducting wire is an ideal material for high-performance superconducting magnets, as it can withstand high magnetic fields and high current densities. Furthermore, in medical devices such as magnetic resonance imaging (MRI), Nb3Sn superconducting wire's unique superconducting properties provide higher sensitivity and resolution, significantly advancing the development of medical diagnostic and treatment technologies.

[0004] However, the preparation of Nb3Sn superconducting wire is not easy. During processing, niobium (Nb) and tin (Sn) elements remain independent of each other, requiring a series of complex heat treatments to form the superconducting Nb3Sn phase. Precise control of parameters such as temperature, pressure, and time is crucial during this process; even the slightest deviation can lead to a decrease in superconducting performance.

[0005] During the heat treatment of Nb3Sn superconducting wire, the winding device is one of the key pieces of equipment. Its design rationality directly affects the performance and yield of the superconducting wire. Currently, there are two main operation methods: winding first and then reacting, and reacting first and then winding.

[0006] Reaction-before-winding refers to the process of processing superconducting materials. Initially, through a specific chemical reaction or heat treatment, separate elements (such as Nb and Sn) react to form a superconducting phase (such as Nb3Sn). This resulting superconducting material is then wound onto a spool to form a superconducting wire. Because superconducting materials like Nb3Sn are brittle and prone to fracture or deformation during processing, the reaction-before-winding process often struggles to achieve ideal superconducting properties.

[0007] The winding-before-reaction method is to first wind the wire (usually composed of Nb and Sn elements, but the two still exist independently of each other) into a desired coil or magnet structure, and then perform a heat treatment process to make the Nb and Sn elements react to generate a superconducting Nb3Sn phase.

[0008] Compared with the process of reacting first and then winding, the process of winding first and then reacting can better control the morphology and performance of the wire during the heat treatment process, but it also faces some technical challenges.

[0009] In the existing winding-first-then-reacting process, the bobbin is generally cylindrical in shape and placed horizontally. During the heat treatment process, as the temperature rises, both the bobbin and the wire will deform due to thermal expansion. However, due to the different thermal expansion coefficients of the bobbin material and the wire material, the stress generated by the two during the expansion process is unevenly distributed. Especially at the upper end of the bobbin, due to the gravity of the wire at the lower end, the upper end wire is subjected to greater stress, thereby affecting its critical current carrying capacity. In addition, the horizontal placement of the bobbin may also cause the wire to slide down after thermal expansion, further reducing the distance between the wire turns, and even causing adhesion, seriously affecting the performance and yield of the superconducting wire.

[0010] Therefore, the present invention provides an improved bobbin and a winding device for heat treatment of superconducting wire. Utility Model Content

[0011] The purpose of the present invention is to provide a bobbin and a winding device for heat treatment of superconducting wires, which can realize vertical placement of the bobbin during the heat treatment of the wires, thereby preventing the wires from sliding down after thermal expansion, resulting in a reduction in the spacing between wire turns, and thus causing the wires to stick together.

[0012] The purpose of this utility model is achieved by the following technical solutions:

[0013] In one aspect, the present invention provides a spool, wherein the spool is a tapered spool, comprising:

[0014] a first supporting plate, wherein a first fixing assembly is provided on the first supporting plate, and the first fixing assembly is used to fix the first end of the wire;

[0015] a second support plate, wherein a second fixing assembly is provided on the second support plate, the second fixing assembly being used to fix a second end of the wire opposite to the first end, and the diameter of the second support plate being larger than the diameter of the first support plate;

[0016] The winding plate is a hollow structure with two sides through which the wire is wound. The winding plate includes a first side and a second side that are arranged opposite to each other. The first side is connected to the first support plate, and the second side is connected to the second support plate. The axial centerline of the winding plate is set to be perpendicular to the workbench, and the distance between the second support plate and the workbench is smaller than the distance between the first support plate and the workbench.

[0017] Beneficial effects of the above scheme: The present invention provides an orderly winding space for the wire by setting a winding plate with a hollow structure that passes through both sides, which not only makes the arrangement of the wire more orderly, but also enables the bobbin to be placed vertically during the heat treatment of the wire, so as to avoid the wire from sliding down after thermal expansion, resulting in a reduction in the spacing between the wire turns, and then causing the wire to stick together. Furthermore, the present invention enables both ends of the wire to be firmly fixed on the bobbin by setting a first fixing component and a second fixing component, which not only facilitates the installation and disassembly of the wire, but also ensures the orderliness of the wire during the winding and heat treatment process. Furthermore, the bobbin provides stable support for the wire through the relatively arranged first support plate and the second support plate. The design that the first support plate has a smaller diameter than the second support plate helps to maintain uniform tension of the wire during the winding process, avoid excessive slack or tightness, and thus protect the wire from damage.

[0018] Furthermore, the winding plate includes an outer surface and an inner surface that are arranged opposite to each other;

[0019] The spool further comprises:

[0020] A glass fiber cloth layer is coated on the outer surface of the winding plate and is used for winding the wire.

[0021] The beneficial effects of the above solution are as follows: The present invention coats the outer surface of the winding plate with one or more layers of fiberglass cloth. This, on the one hand, prevents the winding plate from oxidation and prevents metal ions in the winding plate from reacting with the wire during heat treatment, potentially damaging the wire. On the other hand, it provides a certain amount of friction for the wire, reducing the speed at which the expanded wire slides downward during heat treatment.

[0022] Furthermore, the flatness of the winding plate is 1-100 μm;

[0023] The flatness of the glass fiber cloth layer is 0.5mm to 1mm;

[0024] The glass fiber cloth layer has a temperature resistance greater than 600°C.

[0025] The beneficial effects of the above solution are: the flat winding board surface and glass fiber cloth layer not only make the wire winding process smoother and less likely to slip or dislocate, but also avoid uneven force on the expanded and sliding wire during heat treatment, resulting in stress concentration and uneven distribution, which in turn affects the performance of the wire (for example, reducing the critical current carrying capacity of the wire).

[0026] Furthermore, the first fixing assembly includes at least one group of first fixing holes, each group of first fixing holes is arranged at equal intervals on the periphery of the first support plate, and each group of first fixing holes includes two first fixing holes;

[0027] The second fixing assembly includes at least one group of second fixing holes. Each group of second fixing holes is arranged at equal intervals on the periphery of the second support plate, and each group of second fixing holes includes two second fixing holes.

[0028] The beneficial effects of the above scheme: The utility model provides multiple fixing points for the wires by opening multiple groups of fixing holes at equal intervals around the circumference of the first support plate and the second support plate. It can not only be used for wires of different lengths, but also can minimize the wire material occupied by the two ends of the wires due to fixation, thereby reducing costs.

[0029] Furthermore, each group of the first fixing holes includes two first fixing holes arranged along the diameter direction of the first support plate;

[0030] Each group of the second fixing holes includes two second fixing holes arranged along a diameter direction of the second support plate.

[0031] Furthermore, the winding plate includes an outer surface and an inner surface that are arranged opposite to each other, and a thread structure is provided on the outer surface, and the thread structure is used for winding the wire.

[0032] Beneficial effects of the above solution: The threaded structure of the utility model not only provides an orderly path for winding the wire, reduces the difficulty of the winding process, saves operation time, but also enhances the fixing effect of the wire on the winding plate.

[0033] Furthermore, the friction coefficient of the winding plate is 0.2-0.6;

[0034] The diameter of the virtual circle corresponding to the depression in the thread structure is greater than or equal to 1.0-1.5 times the diameter of the wire.

[0035] The above solution has the following beneficial effects: on the one hand, it can provide a certain friction force for the wire, reducing the speed of the wire sliding down after expansion during the heat treatment process; on the other hand, it can ensure that there is a certain distance between the turns of the wire.

[0036] In another aspect, the present invention provides a winding device for heat treatment of a superconducting wire, comprising:

[0037] the aforementioned spool;

[0038] The mounting portion has a first end connected to the first support plate, and a second end of the mounting portion opposite to the first end connected to the second support plate.

[0039] The beneficial effects of the above scheme: The utility model connects the first support plate and the second support plate through the installation part to form a stable frame structure, which enhances the overall structural stability of the winding device, enables it to withstand greater external loads and vibrations, and is not prone to deformation or damage.

[0040] Furthermore, the first supporting plate is provided with a first mounting hole.

[0041] A second mounting hole is formed on the second supporting plate, and the second mounting hole is coaxially arranged with the first mounting hole;

[0042] The mounting portion includes:

[0043] a mounting tube, wherein a first end of the mounting tube passes through the first mounting hole and the second mounting hole, and a second end of the mounting tube opposite to the first end is connected to an external fixing device;

[0044] A first positioning assembly and a second positioning assembly, wherein the first positioning assembly is arranged on the first supporting plate, the second positioning assembly is arranged on the second supporting plate, and the first positioning assembly and the second positioning assembly are connected to an external fixing device.

[0045] The beneficial effect of the above solution is that the present invention secures the spool by inserting a mounting tube through the first and second mounting holes and connecting the positioning assembly to an external fixture. When the spool needs to be removed or replaced, the mounting tube and positioning assembly can be simply removed from the mounting holes and fixture, eliminating the need for tedious disassembly.

[0046] Furthermore, the first positioning assembly includes a plurality of first positioning holes, and the first positioning holes are connected to an external fixing device;

[0047] The second positioning assembly includes a plurality of second positioning holes, and the second positioning holes are connected to an external fixing device.

[0048] The beneficial effects of the above scheme: The utility model realizes multi-point fixation between the winding device and the external fixing device by respectively setting multiple first positioning holes and second positioning holes on the first positioning component and the second positioning component, thereby enhancing the structural stability of the winding device and preventing loosening or deformation caused by vibration or external force.

[0049] Compared with the prior art, the beneficial effects of the present invention include at least:

[0050] The present invention provides an orderly winding space for the wire by setting a winding plate with a hollow structure that passes through both sides, which not only makes the arrangement of the wire more orderly, but also enables the center line of the winding plate to be set to be perpendicular to the workbench, that is, the bobbin is placed vertically during the heat treatment process of the wire, to avoid the wire sliding down after thermal expansion, resulting in a reduction in the spacing between the wire turns, and thus causing the wire to stick together. Furthermore, the present invention enables the two ends of the wire to be firmly fixed on the bobbin by setting a first fixing component and a second fixing component, which not only facilitates the installation and disassembly of the wire, but also ensures the orderliness of the wire during the winding and heat treatment process. Furthermore, by relatively setting the first support plate and the second support plate, the bobbin provides stable support for the wire. The design that the first support plate has a smaller diameter than the second support plate helps to maintain uniform tension of the wire during the winding process, avoid excessive relaxation or tightness, and thus protect the wire from damage.

[0051] In addition, the utility model connects the first support plate and the second support plate through the mounting portion to form a stable frame structure, thereby enhancing the overall structural stability of the winding device, enabling it to withstand greater external loads and vibrations and not easily deformed or damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic cross-sectional view of a spool according to an embodiment of the present invention.

[0053] Figure 2 This is a structural schematic diagram of a spool according to an embodiment of the present utility model.

[0054] Figure 3 This is a structural diagram of the first support plate of an embodiment of the present utility model.

[0055] Figure 4 This is a structural diagram of the second support plate of an embodiment of the present utility model.

[0056] In the figure: 11, first support plate; 111, first fixing assembly; 112, first mounting hole; 12, second support plate; 121, second fixing assembly; 122, second mounting hole; 13, winding plate; 131, first side; 132, second side; 141, mounting tube; 142, first positioning assembly; 143, second positioning assembly. DETAILED DESCRIPTION

[0057] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make this disclosure more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the figures denote identical or similar structures, and thus repeated descriptions thereof will be omitted.

[0058] The words expressing positions and directions described in this utility model are all explained with reference to the accompanying drawings as examples, but they can be changed as needed, and all such changes are included in the protection scope of this utility model.

[0059] In response to the problems existing in the existing process, the present invention proposes a bobbin and a winding device for heat treatment of superconducting wires. The bobbin of the present invention is a conical bobbin, which is placed vertically on the workbench: (1) It can form a natural gradient distribution of the wire during the winding process. During the heat treatment process, as the temperature rises, the expansion of the wire on the conical bobbin will present a more uniform stress distribution. Compared with the cylindrical bobbin, the conical bobbin can better adapt to the deformation of the wire during the expansion process, avoid the occurrence of excessive force on a single point, and thus effectively reduce the decline in critical current carrying capacity. (2) It can utilize the effects of gravity and friction to make the wire more stable in place when it expands due to heat, effectively solving the problems of reduced turn spacing and adhesion caused by the wire sliding in the existing process, and improving the yield and performance stability of the superconducting wire. (3) It can optimize the heat transfer during the heat treatment process. Since the surface area of ​​the conical bobbin is relatively large, it can absorb and transfer heat more effectively, thereby accelerating the heat treatment process and improving production efficiency. At the same time, the tapered bobbin can also reduce the thermal stress concentration during the heat treatment process, further protecting the superconducting properties of the wire.

[0060] refer to Figure 1 and Figure 2 The bobbin of the present invention includes a winding plate 13 and a first support plate 11 and a second support plate 12 disposed opposite each other. Furthermore, to prevent oxidation of the winding plate 13 and to prevent metal ions in the winding plate 13 from reacting with the wire during heat treatment and damaging the wire, the bobbin of the present invention also includes a fiberglass cloth layer.

[0061] In use, the first support plate 11 and the second support plate 12 are both circular, and the winding plate 13 is a cylindrical structure. The temperature resistance of the glass fiber cloth layer is greater than or equal to 600°C.

[0062] The two ends of the wire of the present invention are respectively fixed on the first support plate 11 and the second support plate 12 .

[0063] In some preferred embodiments, a first fixing assembly 111 is provided on the first support plate 11 of the present invention. The first fixing assembly 111 is used to fix the first end of the wire.

[0064] refer to Figure 3 The first fixing assembly 111 includes at least one set of first fixing holes. Each set of first fixing holes is evenly spaced around the circumference of the first support plate 11, and each set of first fixing holes includes two first fixing holes. Furthermore, each set of first fixing holes includes two first fixing holes arranged along the diameter of the first support plate 11, respectively designated A and B.

[0065] During use, the first end of the wire is passed through a first fixing hole A of a group of first fixing holes and passed out from another first fixing hole B, and then the wire is wrapped with wire to fix the first end of the wire on the first support plate 11.

[0066] In some preferred embodiments, a second fixing assembly 121 is provided on the second support plate 12 of the present invention. The second fixing assembly 121 is used to fix the second end of the wire opposite to the first end.

[0067] refer to Figure 4 The second fixing assembly 121 includes at least one set of second fixing holes, each set of second fixing holes being equally spaced around the circumference of the second support plate 12, and each set of second fixing holes including two second fixing holes. Furthermore, each set of second fixing holes includes two second fixing holes arranged along the diameter of the second support plate 12, denoted as C and D, respectively.

[0068] During use, the second end of the wire is passed through a second fixing hole C of a set of second fixing holes and passed through another second fixing hole D, and then the wire is wrapped with wire to fix the second end of the wire on the second support plate 12.

[0069] In some preferred embodiments, in order to achieve vertical placement of the bobbin during the heat treatment of the wire and prevent the wire from sliding down after thermal expansion, resulting in a reduction in the spacing between the wire turns and further adhesion of the wire, the diameter of the second support plate 12 of the utility model is larger than the diameter of the first support plate 11, and the winding plate 13 is a table-shaped hollow structure with two sides through which is used to wind the wire.

[0070] Specifically, the winding plate 13 of the present invention includes a first side 131 and a second side 132 that are arranged opposite to each other. The first side 131 is connected to the first support plate 11, and the second side 132 is connected to the second support plate 12. Furthermore, the first side 131 is connected to the edge of the periphery of the first support plate 11, and the second side 132 is connected to the edge of the periphery of the second support plate 12. When in use, the size of the winding plate 13 can be adjusted by adjusting the diameters of the first support plate 11 and the second support plate 12 to adjust the winding capacity of the spool. In addition, the winding plate 13 of the present invention includes an outer surface and an inner surface that are arranged opposite to each other. The inner surface faces the hollow cavity, and the outer surface faces the external environment. When in use, the outer surface is used to wind the wire. When in use, the area of ​​the outer surface can be adjusted by adjusting the diameters of the first support plate 11 and the second support plate 12 to adjust the winding capacity of the outer surface.

[0071] Since the diameters of the first support plate 11 and the second support plate 12 are different, the bobbin can be placed vertically on the workbench during the heat treatment of the wire. At this time, the diameters of the first support plate 11 and the second support plate 12 are parallel to the workbench, the axis centerline of the winding plate 13 is perpendicular to the workbench, and the distance between the second support plate 12 and the workbench is smaller than the distance between the first support plate 11 and the workbench. During the heat treatment process, after the wire is heated and expanded, the force is evenly distributed, and there is no situation where a single point causes excessive force. In addition, the conical cone-shaped bobbin can effectively solve the problem of the wire sliding down after thermal expansion, the reduction in the spacing between the turns, and the wires sticking to each other. In actual application, those skilled in the art can adjust the diameter difference between the first support plate 11 and the second support plate 12 according to the expansion coefficient of the wire. For example: the larger the expansion coefficient, the larger the diameter difference between the first support plate 11 and the second support plate 12.

[0072] In some preferred embodiments, the spool of the present invention is suitable for winding wires of different diameters and lengths. Specifically, by adjusting the distance between the first support plate 11 and the second support plate 12 and the size of the winding plate 13, it can flexibly adapt to the needs of wires of different specifications.

[0073] During the heat treatment process, the superconducting wire may expand or contract due to thermal expansion and contraction. If the winding plate surface is uneven, the superconducting wire that is expanding and sliding may be subjected to uneven forces, resulting in stress concentration and uneven distribution. If the superconducting wire is subjected to stress during the heat treatment process, thermal stress may be generated within it, affecting the thermal stability of the superconducting material. Thermal stress may cause the superconducting material to deform or crack due to temperature fluctuations, thereby affecting its superconducting performance.

[0074] When a superconducting wire is subjected to large stress, plastic deformation may occur, which will affect the microstructure of the superconducting material and thus its superconducting performance. For example, the lattice structure inside the superconducting material may change due to stress, resulting in a decrease in superconducting performance. Furthermore, high stress may cause cracks to expand within the superconductor and even cause the superconductor to break and damage, which will have a serious impact on the integrity and performance of the superconducting wire. In addition, during the operation of the superconducting magnet structure, large mechanical deformation may induce delamination of the superconducting tape in local locations, reducing the electromagnetic performance of the superconducting device. Furthermore, stress may also cause the resistivity of the superconducting material to increase, thereby reducing its superconducting performance.

[0075] In some preferred embodiments, to prevent uneven stress on the expanded and slumped conductor during heat treatment, leading to stress concentration and uneven distribution, which could affect conductor performance (e.g., reduce the conductor's critical current carrying capacity), the outer surface of the winding plate 13 of the present invention has a flatness of 1-100 μm. During use, the glass fiber cloth layer covering the outer surface of the winding plate 13 has a flatness of 0.5 mm to 1 mm. Furthermore, the glass fiber cloth layer has a coefficient of friction of 0.2-0.6.

[0076] To ensure uniform stress on the wire during heat treatment, reduce the rate of downward movement due to expansion, and prevent chemical reactions between the wire and metal ions in the metal winding plate 13, one or more layers of fiberglass cloth are wrapped around the outer surface of the winding plate 13 before the wire is wound. This provides a flatness of 0.5 to 1 mm and a coefficient of friction of 0.2 to 0.6. This reduces the material requirements for the winding plate 13 and reduces production costs. For example, ordinary stainless steel can be used to make the winding plate 13.

[0077] In some other embodiments, the outer surface of the winding plate 13 of the present invention is provided with a threaded structure for winding a wire. In practice, the diameter of the virtual circle corresponding to the depression in the threaded structure is greater than or equal to 1.0-1.5 times the diameter of the wire. Preferably, the diameter of the virtual circle corresponding to the depression in the threaded structure is greater than or equal to 3 mm. In actual practice, the coefficient of friction of the winding plate 13 is 0.2-0.6.

[0078] To increase winding speed while ensuring the distance between turns is greater than 1.0-1.5 times the diameter of the wire and ensuring equal spacing between adjacent turns, the wire is wound into the depressions of the threaded structure. In practice, before winding the wire, one or more layers of fiberglass cloth are wrapped around the outer surface of the winding plate 13 to obtain a fiberglass cloth layer with a flatness of 0.5mm to 1mm and a friction coefficient of 0.2-0.6. After wrapping the fiberglass cloth layer, the wire is wound into the position of the fiberglass cloth layer corresponding to the depression of the threaded structure by groping for the threaded structure provided on the outer surface of the winding plate 13.

[0079] In summary, the present invention provides an orderly winding space for the wire by setting a winding plate 13 with a hollow structure that passes through both sides. This not only makes the arrangement of the wire more orderly, but also enables the bobbin to be placed vertically during the heat treatment of the wire, so as to avoid the wire sliding down after being heated and expanded during the heat treatment, resulting in a reduction in the spacing between the wire turns, and thus causing the wire to stick together. Furthermore, the present invention enables the two ends of the wire to be firmly fixed on the bobbin by setting a first fixing component 111 and a second fixing component 121, which not only facilitates the installation and disassembly of the wire, but also ensures the orderliness of the wire during the winding and heat treatment process. Furthermore, by relatively setting the first support plate 11 and the second support plate 12, the bobbin provides stable support for the wire. The design that the diameter of the first support plate 11 is smaller than that of the second support plate 12 helps to maintain uniform tension of the wire during the winding process, avoid excessive relaxation or tightness, and thus protect the wire from damage.

[0080] In addition, the utility model also introduces a winding device for heat treatment of superconducting wires.

[0081] The utility model discloses a winding device for heat treatment of a superconducting wire, comprising the above-mentioned bobbin and a mounting portion.

[0082] refer to Figure 1 The first end of the mounting portion of the present invention is connected to the first support plate 11, and the second end of the mounting portion opposite to the first end is connected to the second support plate 12. When used, the mounting portion includes: a mounting tube 141, a first positioning assembly 142 and a second positioning assembly 143.

[0083] In some preferred embodiments, the first support plate 11 of the present invention is provided with a first mounting hole 112, and the second support plate 12 is provided with a second mounting hole 122, and the second mounting hole 122 is coaxially arranged with the first mounting hole 112. During use, the first end of the mounting tube 141 passes through the first mounting hole 112 and the second mounting hole 122, and the second end of the mounting tube 141, opposite the first end, is connected to an external fixing device.

[0084] In some preferred embodiments, the first positioning assembly 142 of the present invention is disposed on the first support plate 11, and the second positioning assembly 143 is disposed on the second support plate 12. The first positioning assembly 142 and the second positioning assembly 143 are connected to an external fixing device. During use, the first positioning assembly 142 includes a plurality of first positioning holes, and the second positioning assembly 143 includes a plurality of second positioning holes. Both the first positioning holes and the second positioning holes are connected to the external fixing device.

[0085] The fixing device of the present invention includes a fixing rod and a first and second triangular plate. Furthermore, the fixing rod is perpendicular to the workbench, with one end of the fixing rod fixed to the workbench. The first triangular plate includes a first hole that matches the fixing rod, and the second triangular plate includes a second hole. During use, the first triangular plate is provided with a plurality of first positioning protrusions that match the plurality of first positioning holes, and the second triangular plate is provided with a plurality of second positioning protrusions that match the plurality of second positioning holes.

[0086] During use, the mounting tube 141 is sleeved onto the fixing rod, and the bobbin is mounted on the fixing rod by inserting the first end of the mounting tube 141 through the first mounting hole 112 and the second mounting hole 122. One end of the fixing rod is inserted into the first hole, and the first positioning protrusion is inserted into the first positioning hole. Then, the second positioning protrusion is inserted into the second positioning hole, and the other end of the fixing rod is inserted into the second hole. This achieves the purpose of securing the winding device to the external fixing device. Finally, the winding device is placed in a heat treatment system to heat treat the wire to obtain a niobium tin (Nb3Sn) superconducting wire.

[0087] In actual application, glass fiber cloth is wrapped on the outer surface of the winding plate 13 to obtain a glass fiber cloth layer with a flatness of 0.5mm to 1mm and a friction coefficient of 0.2-0.6. Then, the first end of the wire is fixed in a first fixing hole A that passes through a group of first fixing holes and passes through another first fixing hole B, and then the wire is wrapped with a wire to fix the first end of the wire on the first support plate 11. Then, the wire is wound on the outer surface of the winding plate 13. Finally, the second end of the wire is passed through a second fixing hole C of a group of second fixing holes and passes through another second fixing hole D, and then the wire is wrapped with a wire to fix the second end of the wire on the second support plate 12. The wire is wound on the winding device. Furthermore, the wire is composed of niobium (Nb) and tin (Sn) elements, but the Nb and Sn elements still exist independently of each other before heat treatment.

[0088] In summary, the utility model realizes multi-point fixation between the winding device and the external fixing device by respectively setting multiple first positioning holes and second positioning holes on the first positioning component 142 and the second positioning component 143, thereby enhancing the structural stability of the winding device and preventing loosening or deformation caused by vibration or external force.

[0089] Compared with the traditional winding device with a cylindrical bobbin, the winding device with a conical bobbin of the utility model: (1) can significantly improve the critical current carrying capacity of the superconducting wire by optimizing the stress distribution and preventing the wire from sliding, making it more stable and reliable. (2) can effectively solve the problems of wire adhesion and reduced turn spacing in the existing process, thereby improving the yield and quality stability of the superconducting wire. (3) can optimize the heat treatment process, for example: increase the winding rate, speed up the production speed, and reduce the production cost. (4) has a wide range of applications. It is not only applicable to Nb3Sn superconducting wires, but can also be extended to other types of superconducting materials.

[0090] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limiting the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the utility model without departing from the principles and purpose of the utility model. All of these changes should fall within the scope of protection of the claims of the present invention.

Claims

1. A spool, characterized in that: include: A first support plate (11), wherein a first fixing assembly (111) is provided on the first support plate (11), and the first fixing assembly (111) is used to fix a first end of a wire; a second support plate (12), wherein a second fixing assembly (121) is provided on the second support plate (12), the second fixing assembly (121) being used to fix a second end of the wire opposite to the first end, and the diameter of the second support plate (12) is greater than the diameter of the first support plate (11); A winding plate (13), the winding plate (13) is a hollow structure with two sides through, used for winding a wire, the winding plate (13) includes a first side (131) and a second side (132) arranged opposite to each other, the first side (131) is connected to the first support plate (11), the second side (132) is connected to the second support plate (12), the axial center line of the winding plate is arranged to be perpendicular to the workbench, and the distance between the second support plate and the workbench is smaller than the distance between the first support plate and the workbench.

2. The spool according to claim 1, wherein The winding plate (13) comprises an outer surface and an inner surface which are arranged opposite to each other; The spool further comprises: A glass fiber cloth layer is coated on the outer surface of the winding plate (13) and is used for winding the wire.

3. The spool according to claim 2, wherein The flatness of the winding plate (13) is 1-100 μm; The flatness of the glass fiber cloth layer is 0.5mm to 1mm; The glass fiber cloth layer can withstand a temperature greater than 600°C.

4. The spool according to claim 1, wherein The first fixing assembly (111) comprises at least one group of first fixing holes, each group of first fixing holes being arranged at equal intervals on the periphery of the first support plate (11), and each group of first fixing holes comprising two first fixing holes; The second fixing assembly (121) comprises at least one group of second fixing holes, each group of second fixing holes being arranged at equal intervals on the periphery of the second support plate (12), and each group of second fixing holes comprising two second fixing holes.

5. The bobbin according to claim 4, wherein Each group of the first fixing holes comprises two first fixing holes arranged along the diameter direction of the first support plate (11); Each group of the second fixing holes includes two second fixing holes arranged along the diameter direction of the second support plate (12).

6. The spool according to claim 1, wherein The winding plate (13) comprises an outer surface and an inner surface arranged opposite to each other, wherein a thread structure is provided on the outer surface, and the thread structure is used for winding a wire.

7. The bobbin according to claim 6, wherein The friction coefficient of the winding plate (13) is 0.2-0.6; The diameter of the virtual circle corresponding to the depression in the thread structure is greater than or equal to 1.0-1.5 times the diameter of the wire.

8. A winding device for heat treatment of superconducting wire, characterized in that: include: The spool according to any one of claims 1 to 7; A mounting portion, wherein a first end of the mounting portion is connected to the first support plate (11), and a second end of the mounting portion opposite to the first end is connected to the second support plate (12).

9. The winding device for heat treatment of superconducting wire according to claim 8, characterized in that: The first support plate (11) is provided with a first mounting hole (112). A second mounting hole (122) is provided on the second support plate (12), and the second mounting hole (122) is coaxially arranged with the first mounting hole (112); The mounting portion includes: a mounting tube (141), wherein a first end of the mounting tube (141) passes through the first mounting hole (112) and the second mounting hole (122), and a second end of the mounting tube (141) opposite to the first end is used for connecting to an external fixing device; A first positioning assembly (142) and a second positioning assembly (143), wherein the first positioning assembly (142) is arranged on the first support plate (11), and the second positioning assembly (143) is arranged on the second support plate (12), and the first positioning assembly (142) and the second positioning assembly (143) are used to connect an external fixing device.

10. The winding device for superconducting wire heat treatment according to claim 9, characterized in that: The first positioning component (142) includes a plurality of first positioning holes, and the first positioning holes are used to connect to an external fixing device; the second positioning component (143) includes a plurality of second positioning holes, and the second positioning holes are used to connect to an external fixing device.

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