Welding tool and welding method of coil connector

Abstract

The invention provides a welding tool and a welding method of a coil connector. The welding tool comprises a heating module, a first fixing piece and an elastic connecting piece. The two ends of the elastic connecting piece are connected with the first fixing piece and the heating module respectively, the connecting position of the elastic connecting piece on at least one of the first fixing piece and the heating module is adjustable in the target direction, and the target direction is the arrangement direction of the first fixing piece and the heating module; the first fixing piece and the heating module are located on the two sides of a to-be-welded part correspondingly and clamp the to-be-welded part. And heat emitted by the heating module melts the welding flux at the to-be-welded position of the to-be-welded part, and the to-be-welded position is welded. By means of the welding tool, the welding effect can be improved.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a welding tool and a welding method for a coil joint. Background Art

[0002] At present, coils are used in many electrical devices, and in many cases, multiple coils are connected and combined into a larger coil for use. The joints of multiple coils need to be welded, and the welding effect will have a great impact on the mechanical and electrical properties of the coil.

[0003] For a high-temperature superconducting coil wound by a high-temperature superconducting tape, it is usually in a multi-pancake structure, formed by stacking a plurality of flat pancake-shaped coils, and adjacent pancake-shaped coils need to be connected. In the related art, a worker uses a handheld welding gun to manually apply welding pressure to the strip joint of the pancake-shaped coil and control the heating time to achieve the welding of the coil joint.

[0004] However, the welding effect of this welding method is difficult to guarantee, and because the space where some coils are located is relatively small, the manual welding operation is difficult, which also affects the welding effect to a certain extent. Therefore, the welding effect of the coil joint still needs to be improved. Summary of the invention

[0005] The present application provides a welding tool and a welding method for a coil joint, and the welding tool can be used to improve the welding effect.

[0006] According to one aspect of the present application, there is provided a welding tool, comprising a heating module, a first fixing member and an elastic connecting member; Two ends of the elastic connector are respectively connected to the first fixing member and the heating module, and a connection position of the elastic connector on at least one of the first fixing member and the heating module is adjustable in a target direction, and the target direction is an arrangement direction of the first fixing member and the heating module; The first fixing member and the heating module are respectively located at two sides of the component to be welded, clamping the component to be welded; the heat emitted by the heating module melts the solder at the position to be welded of the component to be welded, and welds the position to be welded.

[0007] In one embodiment, the at least one component has a plurality of connection holes arranged along the target direction on two side surfaces in the auxiliary direction, and the auxiliary direction is perpendicular to the target direction; The end of the elastic connector is provided with a latch, and the latch is connected to the component where any of the connecting holes is located by being inserted into any of the connecting holes.

[0008] In one embodiment, the first fixing member is U-shaped, and the first fixing member includes a first plate-shaped portion, a second plate-shaped portion, and a third plate-shaped portion connected in sequence, and the first plate-shaped portion and the third plate-shaped portion are parallel; The first plate-shaped portion and the third plate-shaped portion each have a plurality of connection holes arranged along the target direction.

[0009] In one embodiment, a side of the first fixing member close to the heating module has a groove, and the groove is used to limit the part to be welded.

[0010] In one embodiment, a second fixing member is further included; The second fixing member is fixed to a side of the heating module away from the first fixing member and protrudes from the heating module in an auxiliary direction, and the auxiliary direction is perpendicular to the target direction; One end of the elastic connecting member is connected to a portion of the second fixing member protruding from the heating module, and the heating module is connected via the second fixing member.

[0011] In one embodiment, the heating module includes a heat-conducting block, a heating element, and a heat-conducting adhesive, wherein the heating element is embedded in the heat-conducting block, and the heat-conducting adhesive is filled in a gap between the heat-conducting block and the heating element; And / or, the heating module has a cooling channel, and the cooling channel is used to transmit a cooling medium to cool the position to be welded.

[0012] In one embodiment, a temperature detection component is further included, and the temperature detection component is arranged on a surface adjacent to the welding surface in the heating module.

[0013] In one embodiment, the surface of the heating module close to the first fixing member is a flat surface or a concave arc surface; And / or, the elastic connecting member includes a spring.

[0014] According to another aspect of an embodiment of the present application, a method for welding a coil joint is provided, comprising: Placing solder and a transfer sheet in sequence at the exposed coil joints of the coil to be welded, wherein the coil to be welded includes at least two pancake-shaped coils; Clamp the welding tool on the coil to be welded at the location of the coil joint; wherein the welding tool is the welding tool described in any of the above embodiments, the welding surface of the heating module in the welding tool is in contact with the adapter, and the first fixing member in the welding tool is arranged on the side of the coil to be welded away from the location of the coil joint; Controlling the heating module to generate heat and melt the solder, so that the adapter plate can be welded to the coil connector through the solder; Controlling the heating module to stop heating and cooling the coil joint; The welding tool is removed from the coil to be welded.

[0015] In one embodiment, the welding tool also includes a temperature detection component, and the temperature detection component is arranged on a surface adjacent to the welding surface in the heating module; the controlling the heating module to generate heat includes: based on the temperature detected by the temperature detection component, controlling the heating module to generate heat at a target temperature.

[0016] and / or, The welding tool also includes a cooling channel embedded in the heating module, and the cooling of the coil joint includes: transmitting a cooling medium in the cooling channel to cool the coil joint.

[0017] In the embodiment of the present application, the first fixing member and the heating module are respectively arranged on both sides of the part to be welded, and the part to be welded is clamped to weld the part to be welded; and the first fixing member and the heating module are connected by an elastic connecting member, and the connection position thereof is adjustable in the arrangement direction of the first fixing member and the heating module. In this way, the welding tool can be directly fixed to the part to be welded for welding, without the need for manual hand-held welding equipment, and the requirement for operating space is small, which can simplify the operation process and improve the welding consistency of different welding processes. In addition, based on the specific welding requirements of the part to be welded, the connection position of the elastic connecting member in the target direction can be adjusted to provide a suitable pulling force between the first fixing member and the heating module, and the elasticity can avoid excessive pulling force, so that the heating module can apply a suitable welding pressure to the part to be welded to achieve a better welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a welding tool provided in an embodiment of the present application; Figure 2 is a schematic diagram of welding using the welding tool provided in an embodiment of the present application; Figure 3 It is a structural schematic diagram of another welding tool provided in an embodiment of the present application; Figure 4 It is an exploded view of a welding tool provided in an embodiment of the present application; Figure 5 It is a schematic diagram of welding a coil using a welding tool provided in an embodiment of the present application; Figure 6 It is an exploded view of welding a coil using a welding tool provided in an embodiment of the present application; Figure 7 It is a flow chart of a coil joint welding method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0020] The terms used in one or more embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of the present application. The singular forms of "one", "said" and "the" used in one or more embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of the present application refers to and includes any or all possible combinations of one or more associated listed items. The term "at least one" in one or more embodiments of the present application refers to "one or more", and "multiple" refers to "two or more". The term "including" is an open description and should be understood as "including but not limited to", and may include other content on the basis of the content described.

[0021] It should be understood that, although the terms "first", "second", etc. may be used to describe various information in one or more embodiments of the present application, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present application, "first" may also be referred to as "second", and similarly, "second" may also be referred to as "first". Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0022] In many scenarios of electronic equipment, welding between components or parts is required, and the welding effect will greatly affect the working reliability of the electronic equipment. At present, high-temperature superconducting coils are widely used because they have high current density and can generate strong magnetic fields. It is usually necessary to weld the joints between high-temperature superconducting coils to assemble multiple coils into one for use, so that the coil can generate greater electromagnetic strength. For example, high-temperature superconducting coils can be used in nuclear fusion reaction devices, such as toroidal magnetic field (TF, toroidal field) coils, center solenoid (CS, centersolenoid) coils and poloidal magnetic field (PF, poloidal field) coils, etc., to perform a series of controls on the plasma so that the plasma reaches fusion reaction conditions to cause nuclear fusion reactions.

[0023] High-temperature superconducting coils are wound from high-temperature superconducting tapes, and the coils are usually wound into a pancake structure during the winding process. Each single pancake coil is a flat disc-shaped coil wound from a superconducting tape. High-temperature superconducting coils can be double-pancake structures or multi-pancake structures, which are obtained by stacking multiple single-pancake coils up and down, and the tapes in adjacent single-pancake coils need to be connected. The winding process of the pancake coil has a significant impact on its performance. For example, different winding diameters will lead to large differences in the current carrying capacity of the coil. During the winding process, it is also necessary to strictly control the relevant process details to avoid the occurrence of kinking, dislocation and sharp corners of the tape, reduce the probability of coil damage, and ensure the uniformity and reliability of the coil winding.

[0024] In one method, adjacent pancake coils can be wound with the same high-temperature superconducting tape. After one coil is wound, the high-temperature superconducting tape can be made to cross two turns to wind another pancake coil. However, the tape is more likely to be damaged at the cross-turn winding position, resulting in poor coil quality and low working reliability.

[0025] In another method, adjacent pancake coils are wound with different high-temperature superconducting tapes, and joints are left after winding. The adjacent coils are connected by welding the joints. In this method, the welding quality of the joints is particularly important. After welding, the joints of the pancake coils must have good electrical and mechanical properties and consistent uniformity. If the welding quality cannot be guaranteed, it will seriously affect the stability and reliability of the high-temperature superconducting coils.

[0026] In the related art, there are two main methods for welding high-temperature superconducting coil joints, namely manual welding and welding using tooling. Manual welding is a method in which the staff directly applies welding pressure and controls the heating time by holding a welding gun. This method is greatly affected by the staff's skills and experience, and the consistency of the welding process of different coils is difficult to ensure; and manual welding requires a large operating control, and the space at some coil joints is relatively small. Affected by the welding space, this method is difficult to weld the joints in a small space. In a related technology using tooling welding, the welding assembly is made rotatable, and the position of the coil joint is located by rotating the welding assembly and moving it; and the welding angle and welding pressure of the coil are adjusted by rotating the welding assembly to ensure the uniformity and mechanical properties of multiple strip joints after welding. Although this method can simultaneously meet the welding needs of strip joints of multiple pancake-shaped coils with different settings and directions, the overall structure is too complicated, and the complex structure will correspondingly limit its scope of application, and the operation difficulty is also correspondingly high.

[0027] The embodiment of the present application provides a welding tool, which can improve the welding effect of the welded parts. The embodiment of the present application also relates to a welding method for coil joints, which can be used to weld coil joints of different coils, improve the welding effect of the coil joints, and ensure the working reliability of the coil. For example, the coil can be a toroidal magnetic field coil and a poloidal magnetic field coil in a nuclear fusion reaction device, and the nuclear fusion reaction device can be a spherical tokamak.

[0028] Figure 1 Schematic diagram of the structure of a welding tool provided in the embodiment of the present application. Figure 1 As shown, the welding tool 10 includes a heating module 101, a first fixing member 102 and an elastic connecting member 103. The two ends of the elastic connecting member 103 are respectively connected to the first fixing member 102 and the heating module 101, and the connection position of the elastic connecting member 103 on at least one of the first fixing member 102 and the heating module 101 is adjustable in a target direction, and the target direction is the arrangement direction of the first fixing member 102 and the heating module 101 (such as Figure 1 in the x direction).

[0029] The first fixing member 102 is used to fix the welding tool 10, such as fixing the welding tool 10 to the part to be welded. The heating module 101 is used to heat to melt the solder to achieve welding of the parts to be welded. The elastic connector 103 can provide a pulling force between the first fixing member 102 and the heating module 101. By adjusting the connection position of the elastic connector 103, the distance between the two ends of the elastic connector 103 can be changed, that is, the stretching degree of the elastic connector 103 is changed. The greater the stretching degree, the greater the pulling force that the elastic connector 103 can provide. Accordingly, when the distance between the first fixing member 102 and the heating module 101 is constant, the pulling force between the first fixing member 102 and the heating module 101 can be adjusted by adjusting the connection position of the elastic connector 103.

[0030] The connection position of the elastic connecting member 103 may be located at two side surfaces of the first fixing member 102 and the heating module 101, and the two side surfaces refer to two opposite surfaces in the auxiliary direction perpendicular to the target direction. Figure 1 In the figure, the auxiliary direction may be the y direction, such as the direction inward from the paper surface. The first fixing member 102, the heating module 101 and the elastic connecting member 103 may together surround a space, and the space may accommodate the components to be welded during welding.

[0031] In the embodiment of the present application, the number of the elastic connectors 103 may be at least two, and the at least two elastic connectors 103 are respectively connected to the first fixing member 102 and the heating module 101 from both sides to ensure connection stability. In some embodiments, the number of the elastic connectors 103 may also be three, four or more, and the elastic connectors 103 may be evenly distributed on both sides, which is not limited here.

[0032] In the embodiment of the present application, the component to be welded is arranged between the first fixing member 102 and the heating module 101 to weld the component to be welded. Figure 2 Schematic diagram of welding using the welding tool provided in the embodiment of the present application. Figure 2 As shown, the first fixing member 102 and the heating module 101 in the welding tool 10 are respectively located on both sides of the component to be welded 20, clamping the component to be welded 20, and the heating module 101 is attached to the position to be welded of the component to be welded 20. The heat emitted by the heating module 101 can melt the solder H at the position to be welded of the component to be welded 20, and weld the position to be welded.

[0033] When welding is performed using the welding fixture 10, the welding fixture 10 can be fixed on the component to be welded 20, and then the heating module 101 can emit heat to weld the component to be welded 20. In this way, welding can be performed without manually holding the welding equipment, avoiding the problem of poor welding process consistency caused by human techniques or experience in different welding processes, and ensuring that a relatively consistent welding effect can be achieved for different components to be welded.

[0034] During the welding process, the heating module 101 is pressed onto the welding position of the part to be welded 20, and the heating module 101 and the first fixing member 102 clamp the part to be welded 20 from both sides respectively, and the tensile force applied to the heating module 101 will be applied to the part to be welded 20 as welding pressure. Therefore, in the embodiment of the present application, the welding pressure applied by the heating module 101 can be adjusted by adjusting the connection position of the elastic connector 103. Since the welding effect is also related to the welding pressure applied during welding, the welding pressure is adjustable in the embodiment of the present application, so that a suitable welding pressure can be applied to each part to be welded to ensure a better welding effect. In addition, since the elastic connector 103 is elastic, it can be compatible with the error of the connection position to a certain extent, avoid the situation where excessive pressure is caused by inaccurate position, and avoid crushing the parts to be welded.

[0035] Regarding the connection position of the elastic connector 103, in one adjustment method, at least one of the first fixing member 102 and the heating module 101 has a plurality of connection structures (such as Figure 1The connection position of the elastic connector 103 can be adjusted by adjusting the connection structure L connected to the elastic connector 103. The connection structure L can be a structure protruding from the first fixing member 102 or the heating module 101, or can be a through hole or other forms of structure, which is not limited here.

[0036] In another adjustment method, an adjustment structure such as a slide rail is provided on at least one of the first fixing member 102 and the heating module 101, so that the elastic connecting member 103 can be moved on the slide rail and fixed when it moves to a certain position, so as to adjust the connection position of the elastic connecting member 103.

[0037] Figure 1 Take the example that the connection position of the elastic connector 103 on the first fixing member 102 and the heating module 101 is adjustable, and the two components have multiple connection structures. The connection position of only one of the first fixing member 102 and the heating module 101 can also be adjustable, such as only one component has multiple connection structures. The following is an example in which the connection position of the elastic connector 103 is only adjustable on the first fixing member 102, and the connection position with the heating module 101 is fixed.

[0038] In the embodiment of the present application, the elastic connector 103 may include a spring, and the spring provides tension. For example, the spring may be a tension spring, and in a natural state, the coils in the spring may be tightly connected. In some embodiments, the elastic connector 103 may also include rubber or other elastic materials.

[0039] Figure 3 is a schematic diagram of the structure of another welding tool provided in an embodiment of the present application, Figure 4 : is an exploded view of a welding tool provided in an embodiment of the present application. Figure 3 and Figure 4 As shown, the first fixing member 102 and at least one of the components of the heating module 101 (the first fixing member 102 is taken as an example below) have multiple connection holes K arranged along the target direction on two side surfaces in the auxiliary direction, and the auxiliary direction is perpendicular to the target direction. The connection hole K may belong to an implementation method of the above-mentioned connection structure. For example, the multiple connection holes K may be arranged in a row only along the target direction, and the elastic connection member 103 is connected to one connection hole K. This method is not illustrated in the embodiment of the present application. For another example, Figure 3 and Figure 4 As shown, the plurality of connection holes K may be arranged in a plurality of rows and columns along the target direction ( Figure 3 Taking two rows as an example), if the target direction is the row direction and the column direction is the z direction, the elastic connecting member 103 is connected to a plurality of connecting holes K in the column direction.

[0040] Please continue to refer to Figure 3 and Figure 4 The elastic connector 103 has a pin X at its end, and the pin X is inserted into any connection hole K to connect the component where the connection hole K is located. For example, the elastic connector 103 includes a spring 1032 and a fixing block 1031 located at the end of the spring 1032, and the fixing block 1031 protrudes with the pin X. The elastic connector 103 can be connected to other components through the fixing block 1031, such as connecting to the sockets on other components. Figure 3 and Figure 4 Take the example that only one end of the spring 1032 is connected to the fixing block 1031, and the spring 1032 is connected to the first fixing member 102 through the fixing block 1031. In some embodiments, both ends of the spring 1032 may be connected to the fixing block 1031. The setting of the latch X on the fixing block 1031 needs to match the setting of the connecting hole K on the component.

[0041] In some ways, please continue to refer to Figure 3 and Figure 4 The elastic connector 103 may also include a bolt 1033, and both ends of the spring 1032 are connected with the bolt 1033, and connected with other components through the bolt 1033. For example, one end of the spring 1032 is connected to the fixing block 1031 through the bolt 1033, and the other end is connected to the heating module 101 through the bolt 1033.

[0042] For example, the fixing block 1031 of the elastic connecting member 103 has a plurality of ( Figure 3 and Figure 4 The fixing block 1031 may have two (for example) latches X, which are respectively inserted into a row of connecting holes K in the y direction of the first fixing member 102 to achieve the connection between the elastic connector 103 and the first fixing member 102. In some embodiments, the fixing block 1031 may also have only one latch X, or three or even more latches X. The setting of the latch X in the fixing block 1031 needs to match the above-mentioned connecting hole K set in the component to which it is connected (such as the first fixing member 102). In the embodiment of the present application, it is taken as an example that the fixing block 1031 of the elastic connector 103 has multiple latches X only in the y direction. In some embodiments, the fixing block 1031 of the elastic connector 103 may also have multiple rows and columns of latches X, that is, multiple rows of latches X are also arranged in the target direction, which is not limited here.

[0043] In one example, the end of the plug X is a deformable design, and after being inserted into the connection hole K, it can be engaged with the buckle structure in the connection hole K. When force is applied to the end of the plug X in a certain manner, the end of the plug X can be compressed and then pulled out of the connection hole K.

[0044] In one implementation of the first fixing member 102, please continue to refer to Figure 3 and Figure 4 , the first fixing member 102 is U-shaped, and the first fixing member 102 includes a first plate-shaped portion 1021, a second plate-shaped portion 1022, and a third plate-shaped portion 1023 connected in sequence, and the first plate-shaped portion 1021 and the third plate-shaped portion 1023 are arranged opposite to each other, such as the first plate-shaped portion 1021 and the third plate-shaped portion 1023 are parallel. The first plate-shaped portion 1021 and the third plate-shaped portion 1023 both have a plurality of connection holes K arranged along the target direction. For example, the connection hole K can be a through hole, or it can also be a blind hole opened from the outside of the plate-shaped portion. In the embodiment of the present application, the connection hole K is taken as an example of a through hole that penetrates the plate-shaped portion.

[0045] In some embodiments, the first fixing member 102 may also be in a flat plate or block shape. In this embodiment, the connecting hole K may be a blind hole opened on the side of the first fixing member 102 .

[0046] Please continue to refer to Figure 3 and Figure 4 , a groove C may be provided on one side of the first fixing member 102 close to the heating module 101, and the groove C is used to limit the part to be welded, so as to ensure the overall stability of the welding fixture 10. For example, for the U-shaped first fixing member 102, the groove C is located on the inner side of the second plate-shaped portion 1022. The shape of the groove C can be designed according to the shape and size of the part to be welded. In this way, the part to be welded can be clamped from the arrangement direction of the first fixing member 102 and the heating module 101. In some embodiments, the groove C may not be provided on the first fixing member 102 (such as the second plate-shaped portion 1022), and the part to be welded may be clamped from another direction by the first plate-shaped portion 1021 and the third plate-shaped portion 1023, such as a locking structure is provided on the first plate-shaped portion 1021 and the third plate-shaped portion 1023. For example, a groove may be provided on the first plate-shaped portion 1021 and the third plate-shaped portion 1023.

[0047] Take the part to be welded as a coil, such as a high-temperature superconducting coil with a multi-pancake structure as an example. Figure 5 is a schematic diagram of welding a coil using a welding tool provided in an embodiment of the present application, Figure 6 1 is an exploded view of a coil being welded using a welding tool provided in an embodiment of the present application. Figure 5 and Figure 6As shown, the high temperature superconducting coil 202 is wound on the coil frame 201. The coil frame 201 includes a first frame part 2011 and a second frame part 2012. The first frame part 2011 and the second frame part 2012 are both annular structures, and the second frame part 2012 is sleeved on the outer ring surface of the first frame part 101. The first frame part 2011 is an annular cylinder, and the second frame part 2012 is an annular plate. The second frame part 2012 divides the outer ring surface of the first frame part 2011 into two areas, and the pancake-shaped high temperature superconducting coil 202 is wound in the two areas. The first frame part 2011 is provided with welding holes for connecting the high temperature superconducting coil 202, and the strip joints of the high temperature superconducting coil 202 in the two areas are exposed from the welding holes.

[0048] In the embodiment of the present application, when welding the strip joint, solder P1, such as a solder sheet, can be placed in the welding hole first. Then, a flux paste is placed on the solder sheet, and the adapter sheet P2 of the superconducting strip is placed on the flux paste, and then the heating module 101 in the welding tool 10 is extended into the welding hole J to weld the high-temperature superconducting coil 202 on both sides of the second skeleton part 2012. For example, the adapter sheet P2 can be a whole piece, or it can also be composed of multiple sections of superconducting strips arranged (such as a superconducting stack). The side of the first fixing member 102 close to the heating module 101 can have a groove, which can match the width of the second skeleton part 2012 to clamp the second skeleton part 2012. The heating module 101 and the first fixing member 102 in the welding tool 10 clamp the high-temperature superconducting coil and its skeleton from the inside and outside of the coil skeleton 201 of the high-temperature superconducting coil, respectively, so as to realize the welding of the strip joint of the high-temperature superconducting coil from the inside of the coil.

[0049] By welding from the inside of the coil, the superconducting tape of the innermost turn of the high-temperature superconducting coil can be welded together. The flatness of the tape joint is high, and there are fewer additional interfering parts, which can ensure that the welding difficulty is low and the welding effect is good. The welding surface of the heating module 101 (that is, its surface close to the first fixing member 102) can match the shape of the specific welding position in the part to be welded. For example, the welding surface of the heating module 101 can be a plane.

[0050] In some embodiments, the strip joint of the high-temperature superconducting coil is located on the outside. In this way, the coil skeleton may not be provided with welding holes, and the strip joint is directly exposed. In this way, the heating module 101 may be arranged on the outside of the coil, and the first fixing member 102 may be arranged on the inside of the coil, and the strip joint of the high-temperature superconducting coil may be welded from the outside. In this way, since the outside is a convex arc surface, the welding surface of the heating module 101 may be a concave arc surface accordingly, so as to match the shape of the welding position, ensure a large welding contact area, and ensure a good welding effect.

[0051] In the embodiment of the present application, welding can be performed after the high-temperature superconducting coil is wound, which can greatly reduce the damage to the superconducting tape caused by the cross-turn segment. Since the magnetic field is strong and the electromagnetic force is large on the outside of the coil, the requirements for the tape joint are higher, and the probability of problems in the joint welding from the outer arc surface is high. In the embodiment of the present application, welding is performed from the inside of the coil, which can reduce the welding difficulty and improve the reliability of the joint. In addition, welding is performed on the inside of the coil, which is not covered with other tapes. If the joint is damaged, it can be quickly and conveniently repaired or the tape replaced.

[0052] In some embodiments, the welding tool 10 can also be used to weld stress points set outside the coil, such as placing solder between the outermost turn and the second to last turn of the coil for welding, so as to adjust the stress of the coil and reduce the risk of damage to the coil due to bending.

[0053] In some embodiments, please continue to refer to Figure 3 and Figure 4 The welding tool 10 further includes a second fixing member 104. The second fixing member 104 is fixed to a side of the heating module 101 away from the first fixing member 102, and protrudes from the heating module 101 in the auxiliary direction. The second fixing member 104 is used to connect the elastic connecting member 103 and the heating module 101 to avoid position conflicts caused by the direct connection between the elastic connecting member 103 and the heating module 101. One end of the elastic connecting member 103 can be connected to a portion of the second fixing member 104 protruding from the heating module 101, and the heating module 101 is connected through the second fixing member 104.

[0054] By way of example, the second fixing member 104 may be a plate-shaped structure, and the surface of the portion of the second fixing member 104 protruding from the heating module 101 close to the first fixing member 102 is connected to the elastic connecting member 103. By way of another example, the second fixing member 104 may also be a U-shaped structure, and the two end surfaces of the U-shaped structure are connected to the elastic connecting member 103. The elastic connecting member 103 may be connected to the second fixing member 104 by bolts, and the connection may be a fixed connection or a threaded connection.

[0055] like Figure 3 and Figure 4 As shown, the second fixing member 104 can be fixed to the surface of the heating module 101 away from the first fixing member 102 by screws. In some embodiments, the second fixing member 104 can also be directly attached to the surface of the heating module 101 away from the first fixing member 102, or the second fixing member 104 can also be clamped with the side of the heating module 101 away from the first fixing member 102. In some embodiments, the second fixing member 104 can also be omitted, and the end of the heating module 101 away from the first fixing member 102 has a certain protruding structure, and the elastic connecting member 103 is connected by using the protruding structure.

[0056] In the present application, please continue to refer to Figure 3 and Figure 4 , the heating module 101 may include a heat-conducting block 1011 and a heating element 1012, and the heating element 1012 is embedded in the heat-conducting block 1011. The heating element 1012 emits heat, and the heat is transferred to the welding surface through the heat-conducting block 1011, and then transferred to the position to be welded to melt the solder to achieve welding. The heat-conducting block 1011 can be made of a material with high thermal conductivity, such as the material of the heat-conducting block 1011 includes copper. The heating element 1012 may include a plurality of heating rods arranged in sequence. The heating element 1012 may also be a heating plate or other forms of heating devices, which are not limited here. By way of example, the heating element 1012 can be connected to an external power supply, and heat is achieved based on the current transmitted by the external power supply.

[0057] When the welding tool 10 is used to weld the aforementioned high-temperature superconducting coil, the heat-conducting block 1011 needs to be welded through the welding hole on the coil frame for the tape joint. The width of the heat-conducting block 1011 can be substantially the same as the width of the welding hole reserved on the coil frame, and the length can be less than the length of the welding hole, such as being equal to the length of the superconducting tape patch during welding. In some embodiments, the size of the heat-conducting block 1011 can also be greater than or equal to the size of the required welding area.

[0058] In one embodiment, the heating module 101 may further include a thermally conductive adhesive (not shown in the figure), which is filled in the gap between the heat conductive block 1011 and the heating element 1012. For example, the thermally conductive adhesive may be a resin material, such as 2850 epoxy adhesive. The thermally conductive adhesive may fix the heating rod, and may also utilize its high thermal conductivity to transfer the heat generated by the heating rod to the heat conductive block 1011 more quickly.

[0059] Please continue to refer to Figure 3 and Figure 4 The heating module 101 has a cooling channel 1013, which is used to transmit a cooling medium. After welding the position to be welded, the position is cooled. The temperature of the welding area is quickly reduced, and the time that the high-temperature superconducting tape is in a high-temperature state is reduced, thereby achieving the purpose of protecting the superconducting tape from damage. In this way, there is no need to set up more other cooling structures, and the overall welding tooling structure can be simplified. The cooling channel 1013 can be located on the side of the heating element 1012 away from the welding surface to avoid affecting the welding effect.

[0060] The cooling channel 1013 can be embedded in the heat conductive block 1011. The cooling channel 1013 can also be connected to a cooling pipe located outside the heating module 101, and the cooling medium is exchanged with an external cooling device through the cooling pipe. For example, the cooling pipe can be directly embedded in the heat conductive block 1011 as the cooling channel 1013. The cross-section of the cooling channel 1013 can be circular or rectangular or other shapes, which are not limited here. If the cooling medium can be a liquid such as water, liquid nitrogen and liquid helium, the cooling medium can flow in the cooling channel. Or the cooling medium can also be a solid or gaseous medium, such as the cooling medium can include cold helium (which is a gas), which is not limited here.

[0061] In some embodiments, the welding tool 10 also includes a temperature detection component 105, which is arranged near the welding surface in the heating module 101, such as being arranged on an adjacent surface of the welding surface. For example, the temperature detection component 105 can be a PT100 platinum thermal resistor. During the welding process, the temperature detection component 105 can be used to monitor the temperature near the welding surface, and the monitored temperature can be fed back to the temperature controller. The temperature controller controls the current flowing to the heating element 1012 according to the real-time monitored temperature, and adjusts the heating temperature of the heating element 1012, thereby achieving the purpose of accurately controlling the welding temperature.

[0062] In the embodiment of the present application, the overall structure of the welding tool 10 is simple, and it can not only weld the strip joint inside the coil, but also be used to weld the strip joint outside the coil, and has a wide range of applications. The welding tool 10 can be directly fixed on the part to be welded, and can be welded simply and quickly regardless of the angle of the part to be welded or the relationship with the horizontal plane. The welding flexibility is high, and through a simple modular design, the welding requirements under various conditions can be met. In addition, the welding pressure at the welding position can be provided by the elastic connector 103 in the welding tool 10, and the welding pressure can be flexibly adjusted and has a certain compatibility, ensuring that the welding is performed with a suitable welding pressure, which can improve the welding effect. In addition, after the welding is completed, the welding tool 10 can achieve rapid cooling to avoid the superconducting tape at the joint being in a high temperature state for a long time, and can protect the superconducting tape from being damaged; the welding temperature can also be flexibly controlled based on the actual welding situation, which can ensure that the welding controllability is high and provide a better welding effect.

[0063] In summary, in the embodiment of the present application, the first fixing member and the heating module are respectively arranged on both sides of the part to be welded, and the part to be welded is clamped to weld the part to be welded; and the first fixing member and the heating module are connected by an elastic connecting member, and the connection position thereof is adjustable in the arrangement direction of the first fixing member and the heating module. In this way, the welding tool can be directly fixed to the part to be welded for welding, without the need for manual hand-held welding equipment, and the requirement for operating space is small, which can simplify the operation process and improve the welding consistency of different welding processes. Moreover, based on the specific welding requirements of the part to be welded, the connection position of the elastic connecting member in the target direction can be adjusted to provide a suitable pulling force between the first fixing member and the heating module, and the elasticity can avoid excessive pulling force, thereby enabling the heating module to apply a suitable welding pressure to the part to be welded, so as to achieve a better welding effect.

[0064] Figure 7 1 is a flow chart of a coil joint welding method provided in an embodiment of the present application. The welding method is implemented using the aforementioned welding tool 10, and the welding method can be cross-referenced with the above-mentioned introduction to the welding process. Figure 7 As shown, the method includes: Step 702: placing solder and a transfer sheet in sequence at the exposed coil joints of the coil to be welded, wherein the coil to be welded includes at least two pancake-shaped coils.

[0065] For example, the coil to be welded may include a high temperature superconducting coil with a multi-pancake structure. The high temperature superconducting coil may be a central solenoid coil, a poloidal magnetic field coil, and a toroidal magnetic field coil lamp coil in a nuclear fusion reaction device. After these coils are wound, the method provided in the embodiment of the present application may be used to weld the joints of adjacent coils.

[0066] The plurality of coils in the coil to be welded all include coil joints, which may be exposed. For example, a welding hole is provided on the inner side of the coil frame of the coil to be welded, and the coil joint is exposed through the welding hole. Alternatively, the coil joint of the coil to be welded is located on the outer arc surface and is directly exposed. The coil joints of the two coils may be switched with a conductive adapter to connect the two coils. The material of the adapter may be the same as that of the coil to be welded, such as a high-temperature superconducting tape.

[0067] The location of the coil joint is the welding position. When welding the coil to be welded, solder (such as solder sheet) can be placed at the welding position first, and then a transition piece can be added to the solder. For example, the transition piece can be obtained by stacking multiple sections of high-temperature superconducting tapes, or a complete piece of high-temperature superconducting material. The length of the transition piece is relatively long, such as multiple times the width of the high-temperature superconducting tape, to ensure that the resistance at the joint is small. If the current passing through the coil is small, the length of the transition piece can also be appropriately shortened.

[0068] Step 704, clamp the welding tool on the coil to be welded at the location of the coil joint; wherein the welding surface of the heating module in the welding tool contacts the adapter plate, and the first fixing part in the welding tool is arranged on the side of the coil to be welded away from the location of the coil joint.

[0069] The welding jig is the above-mentioned welding jig 10. After the materials required for welding are set at the welding position of the coil to be welded, the welding jig can be used for welding. The heating module and the first fixing member in the welding jig can be respectively set on both sides of the coil to be welded, so that the heating module is attached to the welding position, that is, where the coil joint is located, and the first fixing member is set on the side of the coil to be welded away from the coil joint. If the welding position is located on the inner side of the coil, the heating module is set on the inner side of the coil, and the first fixing member is set on the outer side of the coil, and is engaged with the outer side of the coil skeleton. Then, the elastic connecting member is connected between the heating module and the first fixing member, and a suitable connection position is set to provide suitable welding pressure for welding.

[0070] Step 706: Control the heating module to generate heat to melt the solder, so that the adapter plate can weld the coil joint through the solder.

[0071] After the welding fixture is installed, the heating module in the welding fixture can be controlled to generate heat to transfer heat to the welding position, so that the solder at the welding position melts and the adapter is welded to the coil joint through the solder.

[0072] In an embodiment of the present application, when the welding tool includes a temperature detection component, the temperature detection component is arranged on a surface adjacent to the welding surface in the heating module. The control of heating of the heating module may include: based on the temperature detected by the temperature detection component, controlling the heating module to generate heat at a target temperature. By way of example, the temperature detection component is connected to a temperature controller, and the temperature controller is also used to control the heating module, such as controlling a heating element in the heating module. The temperature controller controls the temperature emitted by the heating element based on the temperature of the welding surface detected by the temperature detection component, to ensure that welding is performed at an appropriate temperature.

[0073] Step 708: Control the heating module to stop heating and cool the coil joint.

[0074] In the case where the adapter is connected to the coil joint by solder, the heating module can be controlled to stop heating, thereby cooling the welding position to solidify the solder. In an embodiment of the present application, the welding tool may further include a cooling channel embedded in the heating module. The cooling of the coil joint includes: transmitting a cooling medium in the cooling channel to cool the coil joint. For example, an external cooling device may be controlled to transmit a cooling medium to the cooling channel so that the cooling medium is transmitted in the cooling channel, and the cold is transmitted to the welding position to quickly cool the welding position and avoid damage to the coil. In some embodiments, the coil joint may also be cooled naturally.

[0075] Step 710: remove the welding tool from the coil to be welded.

[0076] After the coil joint is cooled, the welding of the coil to be welded is completed, and the welding tooling can be disassembled at this time, for example, the elastic welding part is first disassembled, and then the heating module and the first fixing part are disassembled.

[0077] In the embodiment of the present application, the welding joint is welded by clamping the welding tool on the coil to be welded, and the welding convenience is high. The welding process does not need to consider the placement of the coil, and there is no need to make complex adjustments to the welding tool, which can simplify the welding process and improve welding efficiency. The welding pressure can be adjusted by adjusting the connection position of the elastic connector in the target direction, so that it can be ensured that the appropriate welding pressure is applied to the coil joint to achieve a better welding effect. In addition, after the welding is completed, it can be cooled quickly to avoid the superconducting tape at the joint being in a high temperature state for a long time, which can protect the superconducting tape from damage; the welding temperature can also be flexibly controlled based on the actual welding situation, which can ensure that the welding controllability is high and provide a better welding effect.

[0078] The above describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0079] Those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application. In the above embodiments, the description of each embodiment has its own emphasis, and for parts not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0080] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The optional embodiments do not describe all the details in detail, nor do they limit the present application to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can understand and use the present application well.

Claims

1. A welding tool, characterized in that: It includes a heating module, a first fixing member and an elastic connecting member; Two ends of the elastic connector are respectively connected to the first fixing member and the heating module, and a connection position of the elastic connector on at least one of the first fixing member and the heating module is adjustable in a target direction, and the target direction is an arrangement direction of the first fixing member and the heating module; The first fixing member and the heating module are respectively located at two sides of the component to be welded, clamping the component to be welded; the heat emitted by the heating module melts the solder at the position to be welded of the component to be welded, and welds the position to be welded.

2. The welding tool according to claim 1, characterized in that: The at least one component has a plurality of connection holes arranged along the target direction on two side surfaces in the auxiliary direction, and the auxiliary direction is perpendicular to the target direction; The end of the elastic connector is provided with a latch, and the latch is connected to the component where any of the connecting holes is located by being inserted into any of the connecting holes.

3. The welding tool according to claim 2, characterized in that: The first fixing member is U-shaped, and comprises a first plate-shaped portion, a second plate-shaped portion and a third plate-shaped portion connected in sequence, and the first plate-shaped portion and the third plate-shaped portion are parallel; The first plate-shaped portion and the third plate-shaped portion each have a plurality of connection holes arranged along the target direction.

4. The welding tool according to any one of claims 1 to 3, characterized in that: A groove is provided on one side of the first fixing member close to the heating module, and the groove is used to limit the part to be welded.

5. The welding tool according to any one of claims 1 to 3, characterized in that: Also includes a second fixing member; The second fixing member is fixed to a side of the heating module away from the first fixing member and protrudes from the heating module in an auxiliary direction, and the auxiliary direction is perpendicular to the target direction; One end of the elastic connecting member is connected to a portion of the second fixing member protruding from the heating module, and the heating module is connected via the second fixing member.

6. The welding tool according to any one of claims 1 to 3, characterized in that: The heating module comprises a heat-conducting block, a heating element and a heat-conducting adhesive, wherein the heating element is embedded in the heat-conducting block, and the heat-conducting adhesive is filled in the gap between the heat-conducting block and the heating element; And / or, the heating module has a cooling channel, and the cooling channel is used to transmit a cooling medium to cool the position to be welded.

7. The welding tool according to any one of claims 1 to 3, characterized in that: It also includes a temperature detection component, which is arranged on a surface adjacent to the welding surface in the heating module.

8. The welding tool according to any one of claims 1 to 3, characterized in that: The surface of the heating module close to the first fixing member is a flat surface or a concave arc surface; And / or, the elastic connecting member includes a spring.

9. A method for welding a coil joint, characterized in that: include: Placing solder and a transfer sheet in sequence at the exposed coil joints of the coil to be welded, wherein the coil to be welded includes at least two pancake-shaped coils; Clamp the welding tool at the location of the coil joint on the coil to be welded; wherein the welding tool is the welding tool according to any one of claims 1 to 8, the welding surface of the heating module in the welding tool is in contact with the adapter, and the first fixing member in the welding tool is arranged on the side of the coil to be welded away from the location of the coil joint; Controlling the heating module to generate heat and melt the solder, so that the adapter plate can be welded to the coil connector through the solder; Controlling the heating module to stop heating and cooling the coil joint; The welding tool is removed from the coil to be welded.

10. The method according to claim 9, characterized in that The welding tool further includes a temperature detection component, which is disposed on a surface of the heating module adjacent to the welding surface; the controlling the heating module to generate heat includes: controlling the heating module to generate heat at a target temperature based on the temperature detected by the temperature detection component; and / or, The welding tool also includes a cooling channel embedded in the heating module, and the cooling of the coil joint includes: transmitting a cooling medium in the cooling channel to cool the coil joint.

Images