Welding device for high-temperature superconducting current lead superconducting stack

Abstract

The invention relates to the technical field of welding devices, and discloses a welding device for a high-temperature superconducting current lead superconducting stack, which comprises a fixed block, a pressing plate, a pressing block and a pressing bottom plate, an electric telescopic rod is arranged between the fixing block and the pressure applying plate, and a pressure sensor is installed at the bottom of the electric telescopic rod and transmits pressure signals outwards in real time. Limiting grooves are formed in the two sides of the bottom of the pressing plate and matched with telescopic side plates, and a pressing block is connected between the telescopic side plates on the two sides. The pressing bottom plate is arranged on the lower portion of the pressing plate, two grooves are symmetrically formed in the top of the pressing bottom plate, superconductive laminated strips are placed in the grooves, heating pieces are arranged in the grooves, and a zigzag water cooling flow channel is formed in the pressing bottom plate; the two side walls of the groove are each provided with a telescopic side plate comprising a telescopic sliding block, a spring and a limiting protruding block. The device is stable in installation, can accurately adjust the pressure applying force to enable the superconductive laminated strips to be uniformly stressed, is adaptive to the superconductive laminated strips with different specifications, can assist the strips to be stacked in order and realize rapid cooling, and effectively avoids the problems of pseudo soldering, strip damage and dislocation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding device, in particular to a welding device for high-temperature superconducting current lead superconducting stack. BACKGROUND

[0002] The high-temperature superconducting current lead is the core current supply component of the low-temperature magnet system. In the production of the current lead shunt section in the fusion field, the welding quality of the superconducting stack directly determines the current carrying capacity and operation stability of the current lead. Therefore, the welding device specially designed for the superconducting stack becomes the key equipment for the application of superconducting technology in this field.

[0003] In the current superconducting stack welding process, the conventional bolt connection method is often used to fix the welding device. Although this method can achieve basic fixation, it is easy to cause the device to shake during welding due to the influence of installation space and vibration, resulting in a decrease in welding precision. For pressure control, the existing technology mainly adjusts the pressure through a manual knob. Although this method can complete basic pressure application, it cannot real-time master the actual pressure value. Therefore, the superconducting tape is often damaged due to improper pressure control, or the solder adhesion is insufficient due to insufficient pressure, resulting in a virtual weld. For different specifications of superconducting stack tapes, the existing welding device is mainly designed for a single specification. Therefore, the whole device needs to be replaced to process different size tapes. Although this method can meet the welding requirements of a specific specification, the device has poor universality. Frequent replacement of the device not only increases the cost, but also greatly reduces the welding efficiency. Therefore, a welding device for high-temperature superconducting current lead superconducting stack is proposed. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a welding device for high-temperature superconducting current lead superconducting stack to at least solve one of the problems proposed in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a welding device for high-temperature superconducting current lead superconducting stack, comprising: The fixed block, the pressing plate, the pressing block and the pressing bottom plate are stably installed with the vacuum chamber through the fixing hole. The electric telescopic rod is arranged between the fixed block and the pressing plate. The bottom of the electric telescopic rod is provided with a pressure sensor. The pressure sensor transmits the pressure signal to the external display table in real time. A limiting groove is symmetrically formed on the bottom of the pressing plate. A telescopic side plate is adaptively installed in the limiting groove. At least two limiting grooves are formed on each side of the bottom of the pressing plate. Two telescopic side plates are adaptively installed in the limiting grooves on the same side. The pressing block is connected between the two telescopic side plates. The lower side of the pressing plate is provided with a pressing bottom plate, the top of the pressing bottom plate is symmetrically provided with two grooves for placing two superconducting strip materials at the same time, the width of the grooves and the pressing block is matched with the width of the superconducting strip material, the grooves are provided with heating pieces for heating the superconducting strip material, and the inside of the pressing bottom plate is provided with a zigzag water cooling channel; the zigzag water cooling channel is provided with a flow channel inlet, and the uniform welding of the superconducting strip material and the solder strip is realized by vacuum brazing technology. The two side walls of the groove are provided with telescopic side plates, the telescopic side plate comprises a telescopic slider, a spring and a limiting protruding block, the two ends of the spring are respectively connected with the inner end face of the telescopic slider and the inner wall of the pressing bottom plate, and the two ends of the telescopic slider are connected with the limiting protruding block.

[0006] The device can be stably assembled in the welding environment, and the influence of structural deviation on the welding precision is avoided; through the cooperation of the electric telescopic rod and the pressure sensor, the pressing force can be monitored and adjusted in real time, so that the superconducting strip material is uniformly stressed, the solder and the strip material are fully bonded, and the strip material is prevented from being damaged due to excessive pressure; the combination structure of the telescopic side plate and the pressing block can flexibly adjust the pressing area, adapt to superconducting strip materials of different specifications, and improve the application range of the device; the double-groove design of the pressing bottom plate can simultaneously weld two superconducting strip materials, effectively improving the welding efficiency; the telescopic side plate can assist the superconducting strip material to be stacked neatly, reducing the misalignment of the strip material, and ensuring the welding quality; the zigzag water cooling channel can quickly guide out the heat after welding, and cooperate with the temperature sensor to realize accurate temperature control, so that the solder quickly and uniformly solidifies, and the resistance between the strips is prevented from increasing due to improper cooling; the rubber gasket can isolate the pressing block and the superconducting strip material, prevent the surface of the strip material from being scratched, and ensure the current-carrying performance of the superconducting strip material, so as to finally realize high-quality welding of the superconducting stack and meet the production requirements of the superconducting stack in the current lead shunt section of the fusion field.

[0007] Preferably, the material of the fixed block and the pressing plate is hard aluminum alloy, and the surface of the fixed block and the pressing plate is anodized to form a passivation layer, the groove spacing is matched with the width of the pressing block, the material of the pressing block is selected from stainless steel or titanium alloy, and the hardness is not less than a preset standard, so that the pressing block does not deform and does not damage the superconducting strip material during pressing, a fixed hole matched with the protruding rod of the wall surface of the vacuum chamber is formed on one side of the fixed block, the telescopic side plate and the pressing block are fixed through the same horizontal height screw hole, different width pressing blocks can be replaced to adjust the pressing area; the two sides of the telescopic side plate are integrally formed with limiting blocks, a temperature sensor is installed on the side surface of the pressing plate, the temperature sensor also transmits temperature signals to the external display table in real time, heating pieces for heating the superconducting strip material are arranged in the grooves, and rubber gaskets are arranged between the pressing block and the superconducting stack.

[0008] Preferably, the pressure sensor is a block structure, the pressure sensor is fixedly connected with the bottom of the electric telescopic rod, a signal transmission line of the pressure sensor is led out through a small hole pre-set in the side wall of the vacuum chamber, a rubber sealing ring is embedded in the inner wall of the small hole, the rubber sealing ring is made of high-temperature-resistant silicone rubber material, the temperature resistance range covers the temperature of the whole welding process, and the vacuum sealing property is ensured and the line is prevented from being abraded.

[0009] Preferably, the telescopic side plate comprises a telescopic slider, a spring and a limiting protruding block, two ends of the spring are respectively welded with the inner end face of the telescopic slider and the inner wall of the pressing bottom plate, the spring elastic coefficient meets the preset requirement, the telescopic slider is the limiting protruding block in the sliding process, and a wave-shaped groove corresponding to the limiting protruding block is arranged in the inside of the pressing bottom plate and perfectly matches the limiting protruding block in size, so that the superconducting tapes are ensured to be stacked in order.

[0010] Preferably, the material of the flow channel plate of the zigzag water cooling flow channel is copper, the zigzag water cooling flow channel is uniformly distributed in the inside of the pressing bottom plate in a snake shape, a quick connector is arranged at the inlet of the flow channel, the quick connector is convenient for being connected with an external cooling water pipeline, and the quick connection and circulation discharge of the cooling water are realized.

[0011] Preferably, the thickness of the rubber gasket is 1-3 mm, the surface of the rubber gasket is provided with uniformly distributed anti-skid lines, the edge of the rubber gasket adopts a round corner structure, the size of the rubber gasket is adapted to the pressing block, direct contact between the pressing block and the superconducting stack is avoided, the uniformity of pressure transmission is enhanced, and the surface of the superconducting tape is prevented from being scratched.

[0012] Preferably, the temperature sensor is a platinum resistance temperature sensor, the temperature sensor is installed in a reserved installation groove in the side of the pressing plate, a sealing washer is arranged on the inner wall of the installation groove, and the detection end of the temperature sensor is close to the area where the superconducting stack is located, so that the welding temperature is ensured to be collected in real time and accurately, and the data transmission delay is not more than a preset threshold value.

[0013] Preferably, a positioning boss is arranged on the upper surface of the pressing block, a positioning groove matched with the positioning boss is arranged at the corresponding position of the bottom of the pressing plate, and a flexible buffer pad is arranged between the positioning boss and the positioning groove, the material of the flexible buffer pad is polytetrafluoroethylene, the coaxial degree and stability of the installation of the pressing block are enhanced, and the pressure transmission effect is further optimized.

[0014] Preferably, titanium nitride wear-resistant coatings are sprayed on the surfaces of the limiting protruding blocks at the two ends of the telescopic slider, the thickness of the coatings is uniform, and a high-temperature-resistant ceramic protection sleeve is sleeved on the outer side of the spring, the two ends of the sleeve are attached to the inner walls of the telescopic slider and the pressing bottom plate, sliding abrasion of the slider is effectively reduced, and the service life of the spring is prolonged.

[0015] Preferably, the inner wall of the meandering water cooling channel is coated with an anticorrosive coating, the coating material of the anticorrosive coating is polytetrafluoroethylene, a stainless steel filter screen device is arranged at the inlet of the channel, the filter screen aperture is not greater than a preset value, impurities carried by the cooling water can be intercepted, channel blockage is avoided, and the cooling efficiency is ensured to be stable.

[0016] Compared with the prior art, the welding device for the high-temperature superconducting current lead superconducting stack has the following beneficial effects: The fixing block is used for stably installing the device, so that the welding precision is not affected by installation shaking; the electric telescopic rod cooperates with the pressure sensor to transmit the pressure signal in real time, so that the pressing force can be accurately adjusted, the superconducting stack can be uniformly stressed, the solder can be fully bonded without damaging the stack, the problems of virtual welding or stack damage caused by uncontrollable pressing of the traditional device are solved; the pressing block is fixedly connected with the telescopic side plate, so that the pressing range of the pressing area can be adjusted by replacing the pressing block of different widths, the superconducting stack of different specifications can be adapted, and the problem of poor universality of the device is solved; the two recesses in the pressing bottom plate can simultaneously place two superconducting stack tapes, the welding efficiency is improved, and the problem of low efficiency of the traditional device that can only weld one superconducting stack tape at a time is solved; the telescopic side plate is used for assisting the stack to be stacked in order, the problem of welding quality affected by misalignment of the stack is avoided, and the problem of reduced current-carrying capacity caused by uneven stack is solved; the meandering water cooling channel arranged in the pressing bottom plate can ensure uniform solidification of the solder, and the problem of increased resistance between the tapes caused by slow cooling is solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole schematic view of the welding device of the present application; Figure 2 It is a schematic view of the fixing block and the pressing block of the present application; Figure 3 It is a schematic view of the telescopic side plate of the present application; Figure 4 It is a schematic view of the pressing bottom plate of the present application; Figure 5 It is a schematic view of the side sliding block of the pressing bottom plate of the present application; Figure 6 It is a top view of the side sliding block of the pressing bottom plate of the present application; Figure 7 It is a schematic view of the water cooling channel of the present application.

[0018] In the figure: 1, fixed block; 2, pressing plate; 21, limiting groove; 3, telescopic side plate; 4, pressing block; 5, pressing bottom plate; 6, telescopic side plate; 7, superconducting strip material; 8, flow channel inlet; 9, groove; 10, screw hole; 11, electric telescopic rod; 12, zigzag water cooling flow channel; 13, fixing hole; 14, pressure sensor; 15, limiting block; 16, telescopic sliding block; 17, limiting convex block; 18, spring. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0020] The present application provides a technical solution, a welding device for high-temperature superconducting current lead superconducting stack, please refer to Figures 1-7 , comprising: Fixed block 1, pressing plate 2, pressing block 4, pressing bottom plate 5; The electric telescopic rod 11 is arranged between the fixed block 1 and the pressing plate 2, the top end of the electric telescopic rod 11 is connected with the fixed block 1, the bottom end is connected with the pressing plate 2, the bottom of the electric telescopic rod 11 is provided with a pressure sensor 14, and the pressure sensor 14 transmits the pressure signal to the external display table in real time; The limiting groove 21 is symmetrically arranged at the bottom of the pressing plate 2, and the telescopic side plate 3 is fitted and arranged in the limiting groove 21; The top of the pressing block 4 is connected with the bottom of the telescopic side plate 3; The pressing plate 2 is provided below the pressing bottom plate 5, two grooves 9 are symmetrically arranged at the top of the pressing bottom plate 5, and two superconducting strip materials 7 are placed in the grooves 9 at the same time, the grooves 9 are arranged below the corresponding pressing blocks 4, the width of the grooves 9 and the width of the pressing blocks 4 are matched with the width of the superconducting strip materials 7, the grooves 9 are provided with heating pieces for heating the superconducting strip materials 7, the telescopic side plates 6 are arranged on the two side walls of the grooves 9, the zigzag water cooling flow channel 12 is arranged in the pressing bottom plate 5, and the flow channel inlet 8 is arranged on the side of the pressing bottom plate 5 and communicated with the zigzag water cooling flow channel 12; The two grooves 9 symmetrically arranged on the top of the pressing bottom plate 5 support the placement of two superconducting strip materials 7 at the same time, completely changing the limitation of the traditional device that can only weld one superconducting strip material 7 at a time, directly improving the welding efficiency by more than one time, and meeting the demand of large-scale production. Secondly, the electric telescopic rod 11 connects the fixed block 1 and the pressing plate 2, and cooperates with the bottom pressure sensor 14 to feedback the pressure signal in real time, so as to ensure that the pressing process is uniform and controllable, avoid the problems of damage to the superconducting strip material 7 caused by excessive pressure or virtual welding caused by insufficient pressure, significantly reduce the inter-band resistance, and reduce the degradation of current-carrying capacity. The telescopic side plate 3 is fixedly connected with the pressing block 4, and the pressing block 4 of different widths can be replaced to flexibly adjust the pressing area, adapt to superconducting strip materials 7 of different specifications, and improve the universality of the device. The zigzag water cooling channel 12 cooperates with the channel inlet 8 to realize rapid cooling, and cooperates with the temperature sensor to monitor the temperature in real time. The rubber gasket isolates the pressing block 4 and the superconducting strip material 7, and the multiple structures cooperatively guarantee the stability of the welding process, effectively avoid defects such as oxidation, bubbles and strip scratching, and greatly improve the welding quality and operation stability of the superconducting strip. In addition, the welding device is fixed in the vacuum chamber, and uniform welding of the superconducting strip material 7 can be realized through vacuum brazing technology.

[0021] The fixed block 1 and the pressing plate 2 are made of hard aluminum alloy, and the surface of the fixed block 1 and the pressing plate 2 is anodized to form a passivation layer. The material of the pressing block 4 is selected from stainless steel or titanium alloy, and the hardness is not less than the preset standard, so as to ensure that the pressing block 4 is not deformed and does not damage the superconducting strip material 7 during the pressing process. The welding device is arranged in the vacuum chamber, and a fixing hole 13 is formed in one side of the fixed block 1 and adapted to the protruding rod of the wall surface of the vacuum chamber, so as to realize the stable installation of the fixed block 1 and the vacuum chamber through the fixing hole 13. The hard aluminum alloy has low density, which can reduce the overall weight of the device, facilitate the installation and debugging in the vacuum chamber, and has good structural strength, which can withstand the pressure and temperature changes during the welding process. The passivation layer can effectively isolate air and water vapor, prevent the surface of the fixed block 1 and the pressing plate 2 from being oxidized and corroded, and prolong the service life of the device. The pressing block 4 is made of stainless steel or titanium alloy, and the hardness is not less than the preset standard, which can ensure that the pressing block 4 is not deformed during the pressing process, and can also avoid direct damage to the surface structure of the superconducting strip material 7 due to too hard material, and its high wear resistance can reduce the wear after long-term use, maintain the pressing precision, and further improve the consistency of the welding quality and the durability of the device.

[0022] At least two limiting grooves 21 are formed on each side of the bottom of the pressing plate 2, and two telescopic side plates 3 are respectively and adaptively installed in two limiting grooves 21 on the same side, and a pressing block 4 is connected between the two telescopic side plates 3. The pressing block 4 between the two telescopic side plates 3 can be replaced by a pressing block 4 with different widths, and the width of the groove 9 and the width of the pressing block 4 are accurately matched with the width of the superconducting strip material 7, which not only facilitates the adjustment of the width of the pressing area and provides more adjustment gears for replacing the pressing block 4, but also ensures the stability of the connection between the pressing block 4 and the telescopic side plate 3 after installation, avoids deviation during pressing, and ensures the accurate control of the pressing area.

[0023] The pressure sensor 14 is a block structure, the pressure sensor 14 is fixedly connected with the bottom of the electric telescopic rod 11, the signal transmission line of the pressure sensor 14 is led out through a small hole preset in the side wall of the vacuum chamber, a rubber sealing ring is embedded in the inner wall of the small hole, the rubber sealing ring is made of high-temperature-resistant silicone rubber material, and the temperature resistance range covers the whole welding temperature range, which not only ensures the vacuum sealing property but also avoids line wear; The pressure sensor 14 is a block structure and is fixedly connected with the bottom of the electric telescopic rod 11, the block structure increases the contact area of the pressure sensor 14 and the electric telescopic rod 11, ensures the accuracy and stability of pressure detection, can capture the pressure change in the pressing process in real time and transmit it to the external display platform, facilitates the accurate control of the pressure parameter by the operator, and avoids welding defects caused by pressure fluctuation; the signal transmission line of the pressure sensor 14 is led out through a small hole preset in the side wall of the vacuum chamber, and a rubber sealing ring embedded in the inner wall of the small hole is made of high-temperature-resistant silicone rubber material, and the temperature resistance range completely covers the temperature range of the whole welding process, which not only solves the contradiction between line leading-out and vacuum sealing, but also avoids the failure of the sealing element in the high-temperature environment, ensures the stability of the vacuum degree of the vacuum chamber, and eliminates the welding layer oxidation problem caused by air entering; at the same time, the rubber sealing ring is soft and can tightly wrap the signal transmission line, effectively avoiding the wear of the line caused by friction and vibration during the operation or debugging of the device, ensuring the continuous and stable signal transmission, reducing the probability of equipment failure, and improving the reliability and continuity of the welding process.

[0024] The telescopic side plate 6 comprises a telescopic slider 16, a spring 18 and a limiting protruding block 17. The two ends of the spring 18 are respectively welded with the inner end face of the telescopic slider 16 and the inner wall of the pressing bottom plate 5, and the elastic coefficient of the spring 18 meets the preset requirement. The two ends of the telescopic slider 16 are connected with the limiting protruding block 17. The telescopic slider 16 is the limiting protruding block 17 in the sliding process. There is a wave-shaped groove in the inside of the pressing bottom plate 5 corresponding to the telescopic slider 16, and the size perfectly fits the telescopic slider 16, so as to ensure that the superconducting tapes are stacked in order. The telescopic side plate 6 is composed of the telescopic slider 16, the spring 18 and the limiting protruding block 17. The two ends of the spring 18 are respectively welded with the inner end face of the telescopic slider 16 and the inner wall of the pressing bottom plate 5, and the elastic coefficient of the spring 18 meets the preset requirement. This structure design realizes the elastic limiting function of the telescopic slider 16. After the superconducting stacked tapes 7 are put into the groove 9 of the pressing bottom plate 5, the telescopic slider 16 automatically adheres to the side of the superconducting stacked tapes 7 under the elastic force of the spring 18. Through the precise adaptation of the limiting protruding block 17 and the wave-shaped groove in the inside of the pressing bottom plate 5, the positioning and fixing of the superconducting stacked tapes 7 are realized, so as to ensure that the superconducting tapes and the solder tape are stacked in order, avoid misplacement and deviation in the welding process, and reduce the problem of increased resistance caused by poor contact between the tapes from the source. In addition, the elastic effect of the spring 18 enables the telescopic side plate 6 to adapt to superconducting stacked tapes 7 of different widths without the need for additional manual adjustment, thereby improving the operation convenience. The elastic limiting can also buffer slight vibration during the pressing process, reduce the impact on the superconducting stacked tapes 7, further protect the structural integrity of the tapes, and ensure the current-carrying capacity of the superconducting stack.

[0025] The surface of the limiting protruding block 17 at the two ends of the telescopic slider 16 is sprayed with a titanium nitride wear-resistant coating. The coating thickness is uniform. The outer side of the spring 18 is sleeved with a high-temperature-resistant ceramic protection sleeve. The two ends of the sleeve are attached to the inner wall of the telescopic slider 16 and the pressing bottom plate 5, which effectively reduces the sliding wear of the slider and prolongs the service life of the spring 18. The limiting protruding blocks 17 at both ends of the telescopic slider 16 are sprayed with a titanium nitride wear-resistant coating on the surface. Titanium nitride has high hardness and strong wear resistance, which can significantly reduce the sliding friction loss between the limiting protruding blocks 17 and the wave-shaped grooves inside the pressing bottom plate 5, reduce the structural wear caused by long-term repeated sliding, maintain the fitting accuracy of the limiting protruding blocks 17 and the wave-shaped grooves, and ensure the stable and reliable adjustment function of the telescopic side plate 6. The high-temperature-resistant ceramic protective sleeve on the outside of the spring 18 can effectively isolate the high temperature generated by the heating sheet during welding, prevent the spring 18 from losing elasticity and aging due to long-term exposure to high temperature, and prevent friction and wear between the spring 18 and the inner wall of the pressing bottom plate 5 and the telescopic slider 16, thereby prolonging the service life of the spring 18. The sleeve is attached to the inner wall of the telescopic slider 16 and the pressing bottom plate 5 at both ends, which also serves as a positioning function to prevent the spring 18 from shifting or twisting during telescopic movement, ensuring uniform transmission of the spring force of the spring 18 and maintaining the limiting and fixing effect of the telescopic side plate 6. These designs significantly reduce the maintenance frequency and cost of the device, and improve the long-term operation reliability and stability of the device.

[0026] The flow channel plate of the tortuous water cooling flow channel 12 is made of copper, and the tortuous water cooling flow channel 12 is uniformly distributed in the pressing bottom plate 5 in a serpentine shape. A quick connector is provided at the flow channel inlet 8 for easy connection with the external cooling water pipeline, realizing rapid access and circulation of cooling water. The tortuous water cooling flow channel 12 adopts a copper flow channel plate. Copper has excellent thermal conductivity, which can quickly transfer the heat of the superconducting stacked tape 7. Combined with the serpentine and uniform distribution of the flow channel design, the contact area between the cooling water flow and the flow channel plate is increased, making the cooling heat distribution more uniform, avoiding problems such as stress concentration and uneven solder solidification caused by too fast or too slow local cooling of the superconducting stack; the quick connector at the flow channel inlet 8 realizes rapid access and disconnection of cooling water, improving operation efficiency and meeting the rhythm demand of batch production; after the cooling water enters the tortuous water cooling flow channel 12 through the flow channel inlet 8, it circulates and flows, quickly taking away the heat required for solder solidification, greatly shortening the cooling time of the superconducting stack, not only shortening the overall manufacturing cycle, but also avoiding the increase in resistance between superconducting tapes due to slow cooling, ensuring the stable current-carrying performance of the superconducting stack. At the same time, the circulating cooling method is energy-saving and environmentally friendly, reduces water resource consumption, and improves the economy of the device.

[0027] The inner wall of the tortuous water cooling flow channel 12 is coated with a corrosion-resistant coating, and the coating material of the corrosion-resistant coating is polytetrafluoroethylene. A stainless steel filter screen device is built-in at the flow channel inlet 8. The filter screen has a pore size not greater than a predetermined value, which can intercept impurities carried by the cooling water, prevent the flow channel from being blocked, and ensure stable cooling efficiency. The inner wall of the zigzag water cooling flow channel 12 is coated with a polytetrafluoroethylene anticorrosive coating. Polytetrafluoroethylene has excellent corrosion resistance and high temperature resistance, which can effectively resist the corrosion of cooling water and corrosive gases and impurities that may be generated during the welding process on the inner wall of the flow channel, prevent rust and scale on the inner wall of the flow channel, maintain the smoothness of the flow channel, ensure the stability of the cooling water flow rate, and ensure the cooling efficiency. The stainless steel filter screen filter device built-in at the inlet 8 of the flow channel has a pore size not greater than a preset value, which can effectively intercept particles such as silt and impurities carried by the cooling water, prevent impurities from depositing and clogging the flow channel after entering the zigzag water cooling flow channel 12, avoid problems such as uneven distribution of cooling water flow and decrease of cooling efficiency caused by flow channel clogging, and ensure that each superconducting stacked tape 7 can be uniformly and quickly cooled, shorten the solder solidification time, and reduce the performance difference of the superconducting stack caused by uneven cooling. In addition, the combination of the anticorrosive coating and the filter screen filter device prolongs the service life of the zigzag water cooling flow channel 12, reduces the maintenance cost of the device, and ensures the long-term stable operation of the cooling system, providing a reliable guarantee for the consistency of the welding quality.

[0028] A rubber gasket is arranged between the pressing block 4 and the superconducting stacked tape 7, the thickness of the rubber gasket is 1mm-3mm, the surface of the rubber gasket is provided with evenly distributed anti-skid lines, the edge of the rubber gasket adopts a round corner structure, the size of the rubber gasket is matched with the pressing block 4, which can not only avoid direct contact between the pressing block 4 and the superconducting stack, but also enhance the uniformity of pressure transmission, and prevent scratching the surface of the superconducting tape at the same time; The thickness of the rubber gasket is set to 1mm-3mm, which can effectively buffer the pressure applied by the pressing block 4, avoid damage to the surface structure of the tape caused by direct contact between the pressing block 4 and the superconducting stacked tape 7, and ensure that the pressure is smoothly transmitted to the superconducting stacked tape 7, ensuring that the solder and the tape are fully bonded. The anti-skid lines evenly distributed on the surface of the rubber gasket increase the friction between the rubber gasket and the pressing block 4 and the superconducting stacked tape 7, avoid relative sliding during the pressing process, ensure the uniformity of pressure transmission, and reduce the problem of virtual welding caused by insufficient local pressure. The round corner structure of the gasket edge completely eliminates the risk of scratching the surface of the superconducting stacked tape 7 by sharp edges, further protects the integrity of the tape, and reduces the possibility of critical current reduction. In addition, the size of the rubber gasket is accurately matched with the pressing block 4, ensuring that the pressing area of the pressing block 4 is covered, so that the pressure is uniformly applied to the whole superconducting stacked tape 7, improving the consistency of the welding quality. At the same time, the rubber material has certain temperature resistance and can maintain stable performance in the temperature environment during the welding process, prolonging the service life of the gasket.

[0029] A temperature sensor is installed on the side surface of the pressing plate 2, which is a platinum resistance temperature sensor. The temperature sensor is installed in a reserved mounting groove on the side surface of the pressing plate 2, and a sealing washer is arranged on the inner wall of the mounting groove. The detection end of the temperature sensor is close to the area where the superconducting stacked tape 7 is located, ensuring real-time and accurate collection of welding temperature, and the data transmission delay does not exceed the preset threshold. The temperature sensor is a platinum resistance temperature sensor. The platinum resistance temperature sensor has the advantages of high measurement accuracy, strong stability, and fast temperature response speed, can accurately capture the temperature change in the welding process, and provides real-time and reliable temperature data for the operator. The temperature sensor is installed in the reserved installation groove on the side surface of the pressing plate 2. The sealing gasket on the inner wall of the installation groove fixes the position of the sensor and enhances the sealing of the device, avoiding the influence of the installation gap on the vacuum degree inside the vacuum chamber. The detection end of the temperature sensor is close to the area where the superconducting strip material 7 is located, which shortens the response distance of temperature detection, ensures that the collected temperature data are highly consistent with the actual temperature of the superconducting strip material 7, and effectively avoids the problems of insufficient heating or overheating caused by temperature measurement deviation. Insufficient heating will lead to insufficient melting of the solder, affecting the bonding effect. Overheating may damage the internal structure of the superconducting strip material 7 and reduce the current-carrying capacity. Through accurate temperature measurement and real-time monitoring, the operator can adjust the heating parameters in time to ensure that the welding temperature is maintained in the optimal interval of 200-210°C, ensuring that the solder is completely melted and fully wets the surface of the strip material, and improving the stability and reliability of the welding quality.

[0030] A positioning boss is arranged on the upper surface of the pressing block 4, and a positioning groove matched with the positioning boss is arranged at the corresponding position of the bottom of the pressing plate 2. A flexible buffer pad is arranged between the positioning boss and the positioning groove. The flexible buffer pad is made of polytetrafluoroethylene, which enhances the coaxiality and stability of the installation of the pressing block 4 and further optimizes the pressure transmission effect. The positioning boss arranged on the upper surface of the pressing block 4 is accurately matched with the positioning groove at the bottom of the pressing plate 2. This structure design can quickly realize the coaxial alignment of the pressing block 4 and the pressing plate 2, avoid eccentricity during installation, ensure that the pressing center of the pressing block 4 is consistent with the stress center of the superconducting strip material 7, make the pressure uniformly distributed in the entire welding area of the superconducting strip material 7, and reduce the problems of uneven distribution of solder and resistance difference between strips caused by local pressure unevenness. The flexible buffer pad arranged between the positioning boss and the positioning groove is made of polytetrafluoroethylene. Polytetrafluoroethylene has the characteristics of high temperature resistance, wear resistance, and good flexibility, which can buffer the impact force transmitted by the electric telescopic rod 11 during pressing, avoid damage to the pressing block 4 or the pressing plate 2 caused by rigid contact, and reduce the influence of vibration on the superconducting strip material 7, further protecting the structure of the strip material. In addition, the flexible buffer pad can also fill the small gap between the positioning boss and the positioning groove, improve the tightness and stability of the connection, ensure that the pressing block 4 does not displace during pressing, maintain the pressing accuracy, and still ensure the consistency of the welding quality after long-term use, prolonging the service life of the core components of the device.

[0031] The present scheme: before welding, the surface of the superconducting strip material 7 is wiped with alcohol to remove the oxide layer, the superconducting strip material 7 and the solder tape are stacked in sequence and then placed in the groove 9 of the pressing bottom plate 5, the heating sheet is placed at the bottom of the groove 9 in advance, the telescopic side plate 6 is adjusted to make the limiting protruding block 17 adapt to the wave-shaped groove, and the superconducting strip material 7 is ensured to be stacked in order; the rubber gasket is placed on the superconducting strip material 7, the device is installed in the vacuum chamber through the fixing hole 13 of the fixing block 1, the electric telescopic rod 11 is started to drive the pressing plate 2 to move downward, the pressing block 4 applies pressure to the superconducting strip material 7 through the rubber gasket, the pressure sensor 14 feeds back the pressure signal to the external display platform in real time, and the preset pressure is maintained; after the vacuum device is started to make the vacuum chamber reach the preset vacuum degree, the heating sheet is started to heat, the temperature sensor monitors the temperature in real time and maintains at 200-210℃, and the solder is completely melted after heat preservation for 20 minutes; after the heat preservation is completed, cooling water is introduced into the zigzag water cooling channel 12 through the flow channel inlet 8, and when the temperature sensor displays that the temperature has dropped to below 185℃, the solder is completely solidified after standing for 1 minute, the related devices are turned off, the electric telescopic rod 11 is loosened, and the superconducting strip material 7 after welding is taken out.

[0032] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A soldering apparatus for a high temperature superconducting current lead superconducting stack, characterized by, Include: Fixed block (1), pressure plate (2), pressing block (4) and pressing bottom plate (5); The fixed block (1) and pressure plate (2) are provided with an electric telescopic rod (11), the bottom of the electric telescopic rod (11) is provided with a pressure sensor (14), and the pressure sensor (14) transmits pressure signals to the external display table in real time; The bottom of the pressure plate (2) is symmetrically provided with a limiting groove (21), and the limiting groove (21) is adapted to be installed with a telescopic side plate (3). Each side of the bottom of the pressure plate (2) is provided with at least two limiting grooves (21), and the limiting grooves (21) on the same side are adapted to be installed with the telescopic side plate (3). Two telescopic side plates (3) are connected with the pressing block (4). The bottom of the pressure plate (2) is provided with a pressing bottom plate (5), the top of the pressing bottom plate (5) is symmetrically provided with two grooves (9), the grooves (9) are located directly below the pressing block (4), the grooves (9) are placed with superconducting strip material (7), the width of the grooves (9) and the pressing block (4) is adapted to the width of the superconducting strip material (7), the grooves (9) are provided with heating fins for heating the superconducting strip material (7), and the pressing bottom plate (5) is provided with a zigzag water cooling channel (12). The two side walls of the groove (9) are provided with telescopic side plates (6), the telescopic side plates (6) comprise telescopic sliders (16), springs (18) and limiting convex blocks (17), the two ends of the spring (18) are connected with the inner end face of the telescopic slider (16) and the inner wall of the pressing bottom plate (5), and the two ends of the telescopic slider (16) are connected with the limiting convex block (17).

2. A soldering device for high temperature superconducting current lead superconducting stacks according to claim 1, characterized in that: The material of the fixed block (1) and the pressure plate (2) is hard aluminum alloy, and the surface of the fixed block (1) and the pressure plate (2) is treated by anodic oxidation to form a passivation layer.

3. A soldering device for high temperature superconducting current lead superconducting stacks according to claim 1, characterized in that: The fixed block (1) is provided with a fixed hole (13) on one side, and the fixed block (1) is arranged in the vacuum chamber through the fixed hole (13).

4. A soldering device for high temperature superconducting current lead superconducting stacks according to claim 1, characterized in that: The side of the pressure plate (2) is provided with a temperature sensor, the temperature sensor is a platinum resistance temperature sensor, and the detection end of the temperature sensor is close to the area where the superconducting strip material (7) is located.

5. A soldering apparatus for high temperature superconducting current lead superconducting stacks according to claim 1, characterized in that: The two sides of the telescopic side plate (3) are integrally formed with limiting blocks (15), and the limiting blocks (15) are adapted to the limiting grooves (21).

6. A soldering apparatus for high temperature superconducting current lead superconducting stacks according to claim 1, characterized in that: The material of the pressing block (4) is stainless steel or titanium alloy, the pressing block (4) and the superconducting strip are provided with a rubber gasket, and the surface of the rubber gasket is provided with uniformly distributed anti-skid lines.

7. A soldering apparatus for high temperature superconducting current lead superconducting stacks according to claim 1, characterized in that: The upper surface of the pressing block (4) is provided with a positioning boss, the bottom of the pressure plate (2) is provided with a positioning groove matched with the positioning boss, and the positioning boss and the positioning groove are provided with a flexible buffer pad.

8. A soldering apparatus for high temperature superconducting current lead superconducting stacks according to claim 1, characterized in that: The flow channel plate of the zigzag water cooling channel (12) is made of copper, and the zigzag water cooling channel (12) is uniformly distributed in the pressing bottom plate (5) in a serpentine shape.

9. A soldering apparatus for high temperature superconducting current lead superconducting stacks according to claim 1, characterized in that: The limiting convex block (17) is sprayed with a titanium nitride wear-resistant coating on the surface, the spring (18) is sleeved with a ceramic protective sleeve on the outside, and the ceramic protective sleeve is attached to the inner wall of the telescopic sliding block (16) and the pressing bottom plate (5) at both ends.

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