Aluminum spot welding gun for welding

Abstract

The present invention relates to the field of welding technology, and specifically to an aluminum spot welding gun for welding, comprising: a gun body; a lifting welding assembly, the lifting welding assembly comprising a welding head driven to lift for spot welding an aluminum plate; a fixed positioning assembly, the fixed positioning assembly is used to fix the aluminum plate and limit the lifting height of the welding head; an oxidation reduction assembly, the oxidation reduction assembly comprising a sliding piece driven to lift, the sliding piece is fixedly connected to the outer wall of the welding head and at a lower position. The present invention can spray protective gas to the electric welding area through an external pipe connection during spot welding to reduce the oxidation of the spot welding part by oxygen in the air. At the same time, the sprayed protective gas can form an airflow in the welding area to take away the heat generated by welding, thereby helping to keep the welding temperature within an appropriate range and preventing oxidation caused by overheating.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to an aluminum spot welding gun for welding. Background Art

[0002] Spot welding is a common welding process, mainly used for connecting metal materials. Current and pressure are applied to the contact points of the metals, and the heat generated when the current passes through the metals is used to melt and connect the metals, so that they are combined together during the cooling process. Spot welding is commonly used for connecting aluminum plates, and is also widely used in automobile manufacturing, home appliances, electronic products and other fields.

[0003] Prior art, such as a spot welding gun for aluminum used for welding disclosed in publication number CN117798569A, during the process of resistance welding, the aluminum plates to be welded are overlapped and placed on a base, and the welding head is lowered to utilize the heat generated when the current passes through the metal and heat it, so as to melt and combine the overlapping aluminum materials together. However, during the welding process, when the aluminum comes into contact with oxygen, an aluminum oxide film will quickly form on the surface, and the aluminum oxide film will hinder the good bonding of the weld metal, resulting in insufficient strength at the joint. At the same time, the oxide layer may cause embrittlement of the heat-affected zone, reducing the toughness of the material. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides an aluminum spot welding gun for welding, which can effectively solve the problem in the prior art that aluminum plates are prone to oxidation during welding.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present invention provides an aluminum spot welding gun for welding, comprising:

[0007] Gun body;

[0008] A lifting welding assembly, the lifting welding assembly comprising a welding head driven to lift and lower for spot welding the aluminum plate;

[0009] A fixed positioning component, which is used to fix the aluminum plate and limit the lifting height of the welding head;

[0010] The oxidation reduction component includes a sliding plate that is driven to rise and fall, the sliding plate is fixedly connected to the outer wall of the welding head at a lower position, and the lower end surface of the sliding plate is symmetrically installed with two arc-shaped structures and jet boxes coaxially arranged with the welding head, and the inner arc surfaces of the two jet boxes are provided with air outlets at a lower position, and the outer arc surfaces of the two jet boxes are connected with an external pipe, and the external pipe has an electromagnetic valve embedded therein, and the external pipe is externally connected to a protective gas source.

[0011] Preferably, a U-shaped frame is fixedly installed on the upper end surface of the gun body, a first telescopic part is embedded in the U-shaped frame, the first telescopic part is electrically connected to a controller, a lifting rod is fixedly installed on the output end of the first telescopic part, a lifting box is fixedly installed on the lower end of the lifting rod, the welding head is fixedly connected to the welding head at a lower position of the inner wall of the lifting box, the welding head passes through the lifting box and extends to below it, a resistance heating element is fixedly installed on the outer wall of the welding head and at an upper position, a temperature detection element is fixedly installed on the outer wall of the welding head and at a middle position, and the resistance heating element and the temperature detection element are electrically connected to the controller.

[0012] Preferably, a second telescopic piece is fixedly installed on the lower end surface of the gun body, the telescopic end of the second telescopic piece passes through the gun body and is fixedly installed with a connecting head, a telescopic clamp is damped and slidably installed in the connecting head, an L-shaped connecting rod is fixedly installed on the side of the connecting head away from the telescopic clamp, a corrugated telescopic tube is fixedly installed on the upper end surface of the gun body, the corrugated telescopic tube is coaxially sleeved on the outer wall of the lifting rod, the corrugated telescopic tube is filled with hydraulic oil, a first fixing plate is fixedly installed on the upper end of the corrugated telescopic tube, a first spring is fixedly installed in the corrugated telescopic tube, two ends of the first spring are respectively fixed to the corrugated telescopic tube and the first fixing plate, a first airbag is fixedly installed on the upper end surface of the gun body and at a position away from the corrugated telescopic tube, a liquid-blocking ventilation membrane is embedded on the upper end surface of the first airbag, the first airbag is connected to the corrugated telescopic tube through a connecting pipe, a linkage frame is fixedly installed on the outer wall of the first fixing plate, and the lower end surface of the linkage frame is fixed to the L-shaped connecting rod.

[0013] Preferably, a lifting base is slidably mounted on the lower end surface of the gun body, a pressure sensor is embedded on the upper end surface of the lifting base, the pressure sensor is signal-connected to the input end of the controller, two external brackets are symmetrically mounted on the outer wall of the lifting base and at a lower position, electromagnets are fixedly mounted on the upper end surfaces of the two external brackets, two iron blocks are symmetrically mounted on the lower end surface of the gun body, the electromagnets are magnetically connected to the iron blocks, and the electromagnets are electrically connected to the controller.

[0014] Preferably, a second fixing plate is fixedly installed on the outer wall of the welding head and above the sliding plate, a second spring is fixedly installed between the second fixing plate and the sliding plate, an inflation box is embedded in the external tube, and a third airbag is fixedly installed on the inner wall of the inflation box.

[0015] Preferably, a mounting bracket is fixedly mounted on one side of the gun body close to the sliding plate, a second airbag is fixedly mounted on one side of the mounting bracket close to the sliding plate, the second airbag is driven for compression, both sides of the second airbag are connected with ventilation pipes, and one end of the ventilation pipe away from the second airbag passes through the inflation box and is connected with the third airbag.

[0016] Preferably, fixed tooth plates are fixedly installed on both sides of the lifting box, two connecting plates are fixedly installed on both sides of the fixed tooth plates, and linkage compression plates are fixedly installed on the lower ends of the two connecting plates, and the linkage compression plates are fixedly connected to the upper end surface of the second airbag.

[0017] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0018] First, by setting up two jet boxes, during spot welding, the shielding gas can be connected to the electric welding area through an external pipe to spray it, so as to reduce the oxidation of the spot welding part by oxygen in the air. At the same time, the sprayed shielding gas can form an airflow in the welding area to take away the heat generated by welding, thereby helping to keep the welding temperature within an appropriate range and preventing oxidation caused by overheating. The thickness of the aluminum plate is used to allow the linkage pressure plate to squeeze the second airbag to different degrees, and the squeezed air is allowed to flow into the third airbag to expand the third airbag. The expanded third airbag will reduce its inner diameter, so that the shielding gas can be transported from the inner diameter of the third airbag at different flow rates according to the thickness of the aluminum plate to spray it to the spot welding part of the aluminum plate.

[0019] Second, through the set pressure sensor, after the welding head melts the aluminum plate, the pressure of the welding head squeezing the aluminum plate will be transmitted to the pressure sensor. After the pressure sensor senses the pressure of the welding head, the controller will cut off the power of the electromagnet, allowing the lifting base to drive the welded aluminum plate to slide downward, and at the same time, the first telescopic part drives the welding head to rise, so as to avoid the situation where the welding head exerts excessive pressure on the aluminum plate and causes spot welding failure. At the same time, the lifting base that slides downward can facilitate the replacement of welding points of the aluminum plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the decomposition structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the lifting welding assembly of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the fixed positioning assembly of the present invention;

[0025] Figure 5 It is a schematic diagram of the internal structure of the bellows expansion tube of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the oxidation reduction component of the present invention;

[0027] Figure 7 It is a schematic diagram of the side structure of the oxidation reduction component of the present invention.

[0028] Figure numerals: 1, gun body; 2, lifting welding assembly; 201, U-shaped frame; 202, first telescopic member; 203, lifting rod; 204, lifting box; 205, resistance heating element; 206, temperature detection element; 207, welding head; 3, fixed positioning assembly; 301, second telescopic member; 302, connecting head; 303, telescopic clamp; 304, L-shaped connecting rod; 305, linkage frame; 306, first airbag; 307, corrugated telescopic tube; 308, connecting tube; 309, first fixing plate ; 310, first spring; 311, iron block; 312, lifting base; 313, external bracket; 314, electromagnet; 315, pressure sensor; 4, oxidation reduction component; 401, fixed tooth plate; 402, connecting plate; 405, linkage compression plate; 406, mounting bracket; 407, second airbag; 408, ventilation pipe; 409, second fixed plate; 410, second spring; 411, sliding plate; 412, jet box; 413, external tube; 414, inflation box; 415, third airbag. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention will be further described below in conjunction with the embodiments.

[0031] Example: Refer to Figures 1 to 7 , an aluminum spot welding gun for welding, comprising:

[0032] Gun body 1;

[0033] The lifting welding assembly 2 includes a welding head 207 driven to lift and lower for spot welding the aluminum plate, and the lifting welding assembly 2 is used to drive the welding head 207 to lift and lower and heat it, and heat it to the melting point of the aluminum plate;

[0034] The fixed positioning component 3 is used to fix the aluminum plate and limit the lifting height of the welding head 207. The fixed positioning component 3 is used to fix the aluminum plate. After the aluminum plate is fixed, the lowering height of the welding head 207 can be adjusted according to the different thicknesses of the aluminum plate;

[0035] The oxidation reduction component 4 includes a sliding piece 411 that is driven to rise and fall, and the sliding piece 411 is fixedly connected to the outer wall of the welding head 207 and is located at a lower position. The lower end surface of the sliding piece 411 is symmetrically installed with two arc-shaped structures and jet boxes 412 that are coaxially arranged with the welding head 207. The inner arc surfaces of the two jet boxes 412 and the lower position are provided with air outlets. The outer arc surfaces of the two jet boxes 412 are connected with an external pipe 413, and a solenoid valve is embedded in the external pipe 413. The external pipe 413 is externally connected to a shielding gas source (the shielding gas can be argon because it is low in cost and can effectively protect the welding area. The output argon can be input into the external pipe 413 through an external air pump, so that the argon has a certain gas pressure and is sprayed toward the welding area).

[0036] Reference Figures 2 to 3 A U-shaped frame 201 is fixedly installed on the upper end surface of the gun body 1, and a first telescopic member 202 is embedded in the U-shaped frame 201. The first telescopic member 202 is electrically connected to a controller. A lifting rod 203 is fixedly installed on the output end of the first telescopic member 202, and a lifting box 204 is fixedly installed on the lower end of the lifting rod 203. The lifting box 204 is fixedly connected to a welding head 207 at a lower position of the inner wall, and the welding head 207 runs through the lifting box 204 and extends to the bottom thereof. A resistance heating element 205 is fixedly installed on the outer wall and upper position of the welding head 207, and a temperature detection element 206 is fixedly installed on the outer wall and middle position of the welding head 207. The resistance heating element 205 and the temperature detection element 206 are electrically connected to the controller. Through the setting of the first telescopic member 202 (the first telescopic member 202 is a cylinder), the first telescopic member 202 drives the welding head 207 to lift, and the welding head 207 can be heated by the resistance heating element 205).

[0037] Reference Figures 4 to 5A second telescopic member 301 is fixedly installed on the lower end surface of the gun body 1, and the telescopic end of the second telescopic member 301 passes through the gun body 1 and is fixedly installed with a connector 302, a telescopic clamp 303 is installed in the connector 302 for damping sliding, and an L-shaped connecting rod 304 is fixedly installed on the side of the connector 302 away from the telescopic clamp 303, and a corrugated telescopic tube 307 is fixedly installed on the upper end surface of the gun body 1. The corrugated telescopic tube 307 is coaxially sleeved on the outer wall of the lifting rod 203, and the corrugated telescopic tube 307 is filled with hydraulic oil. A first fixing plate 309 is fixedly installed on the upper end of the corrugated telescopic tube 307, and a first spring 310 is fixedly installed in the corrugated telescopic tube 307, and the two ends of the first spring 310 are respectively connected to the corrugated The bellows telescopic tube 307 and the first fixing plate 309 are fixed to each other. A first airbag 306 is fixedly installed on the upper end surface of the gun body 1 and at a position away from the bellows telescopic tube 307. A liquid-blocking ventilating membrane is embedded on the upper end surface of the first airbag 306. The first airbag 306 is connected to the bellows telescopic tube 307 through a connecting pipe 308. A linkage frame 305 is fixedly installed on the outer wall of the first fixing plate 309. The lower end surface of the linkage frame 305 is fixed to the L-shaped connecting rod 304. Through the setting of the second telescopic member 301 (the second telescopic member 301 is an electric telescopic rod), the second telescopic member 301 drives the connecting head 302 and the telescopic clamp 303 to descend to fix the aluminum plate to prevent the aluminum plate from shifting during the electric welding process.

[0038] Reference Figure 4 A lifting base 312 is slidably installed on the lower end surface of the gun body 1, and a pressure sensor 315 is embedded on the upper end surface of the lifting base 312. The pressure sensor 315 is connected to the input end signal of the controller. Two external brackets 313 are symmetrically installed on the outer wall of the lifting base 312 and at the lower position. Electromagnets 314 are fixedly installed on the upper end surfaces of the two external brackets 313. Two iron blocks 311 are symmetrically installed on the lower end surface of the gun body 1. The electromagnet 314 is magnetically connected to the iron block 311, and the electromagnet 314 is electrically connected to the controller. Through the setting of the electromagnet 314, the electromagnet 314 can be energized by the external power supply of the controller and generate electromagnetic adsorption on the lower end surface of the iron block 311, so as to keep the lifting base 312 at a certain height.

[0039] Reference Figure 6 to Figure 7 A second fixed plate 409 is fixedly installed on the outer wall of the welding head 207 and above the sliding plate 411, a second spring 410 is fixedly installed between the second fixed plate 409 and the sliding plate 411, an inflation box 414 is embedded in the external tube 413, a third air bag 415 is fixedly installed on the inner wall of the inflation box 414, and the third air bag 415 adjusts the air intake of the protective gas by the thickness of the aluminum plate.

[0040] Reference Figure 6 to Figure 7A mounting frame 406 is fixedly installed on one side of the gun body 1 close to the sliding sheet 411, and a second airbag 407 is fixedly installed on one side of the mounting frame 406 close to the sliding sheet 411. The second airbag 407 is driven for compression, and ventilation pipes 408 are connected on both sides of the second airbag 407. One end of the ventilation pipe 408 away from the second airbag 407 passes through the inflation box 414 and is connected to the third airbag 415. The gas inside the second airbag 407 is squeezed by the second airbag 407, and is transported to the inside of the third airbag 415 through the ventilation pipe 408. The inner wall of the third airbag 415 allows the protective gas to circulate. After the gas is input, the third airbag 415 will expand to reduce the inner wall diameter to reduce the circulation of the protective gas.

[0041] Reference Figure 6 to Figure 7 Fixed tooth plates 401 are fixedly installed on both sides of the lifting box 204, and two connecting plates 402 are fixedly installed on both sides of the fixed tooth plates 401. Linkage compression plates 405 are fixedly installed at the lower ends of the two connecting plates 402. The linkage compression plates 405 are fixedly connected to the upper end surfaces of the second airbags 407. Through the setting of the linkage compression plates 405, the linkage compression plates 405 will compress the second airbags 407 during the process of being driven to lift, so that the air inside the second airbags 407 is transported to the inside of the third airbags 415.

[0042] The working principle of the present invention is as follows:

[0043] The aluminum plate to be spot welded is placed on the upper end surface of the lifting base 312, and the second telescopic member 301 is opened. The telescopic end of the second telescopic member 301 drives the connecting head 302 and the telescopic clamp 303 to descend to clamp and fix the aluminum plate on the upper end surface of the lifting base 312. For aluminum plates of different thicknesses, the second telescopic member 301 will drive the connecting head 302 and the telescopic clamp 303 to descend to different degrees to fix and clamp the aluminum plate. The telescopic clamp 303 adjusts the length of the outward sliding extension according to the shape and size of the aluminum plate to spot weld the aluminum plate near the center. When the connecting head 302 is lowered to fix the aluminum plate, it will also drive the L-shaped connecting rod 304, the linkage frame 305 and the first fixing plate 309 to descend. During the descending process, the first fixing plate 309 compresses the bellows expansion tube 307 and the first spring 310, so that the hydraulic oil filled in the bellows expansion tube 307 flows to the first airbag 306 through the connecting pipe 308. At the same time, during the descending process of the linkage frame 305, the first airbag 306 is compressed, so that the air inside the first airbag 306 is discharged outward through the liquid-blocking vent membrane, so that the first airbag 306 can be The air inside the bag 306 is discharged to contain the hydraulic oil. After the air is discharged, the first air bag 306 will be squeezed by the downward movement of the linkage frame 305, causing the hydraulic oil to produce a certain amount of hydraulic oil, and the hydraulic pressure will be transmitted to the inside of the bellows telescopic tube 307 through the connecting pipe 308, and the hydraulic oil inside the bellows telescopic tube 307 will produce hydraulic pressure to cooperate with the descending linkage frame 305 to limit the descending distance of the connecting head 302 and the telescopic clamp 303, so that the hydraulic oil squeezed inside the bellows telescopic tube 307 can be effectively discharged to the outside, and then the bellows telescopic tube 307 will not have When squeezed, the hydraulic oil flows back to the bellows expansion tube 307 through the resilience of the first spring 310, and the external air re-enters the first airbag 306. It should be noted that the thickness of the aluminum plates is different. When the connecting head 302 and the expansion clamp 303 are driven down to clamp the aluminum plate, the L-shaped connecting rod 304 drives the linkage frame 305 to drive the first fixing plate 309 to compress the bellows expansion tube 307 to a length equal to the distance that the connecting head 302 and the expansion clamp 303 are driven down to clamp the aluminum plate.

[0044] By opening the first telescopic member 202, the lifting rod 203, the lifting box 204 and the welding head 207 are driven to descend, the resistance heating element 205 heats the welding head 207, and the temperature detection element 206 monitors the heating temperature. The descending welding head 207 drives the sliding piece 411 to descend, and the descending sliding piece 411 will first contact the aluminum plate. As the welding head 207 continues to descend, the sliding piece 411 will slide upward on the outer wall of the welding head 207 and compress the second spring 410. At this time, one of the solenoid valves set in the external pipe 413 will open to allow the protective gas to be transported from the electromagnet 314 to the jet box 412 and sprayed from the air outlet. The sprayed protective gas will be from the lower end of the welding head 207 to the aluminum plate The protective gas is circulated between the welding heads 207 and the welding heads 207, and the air inside the welding heads 207 is taken away (the lower end of the existing welding heads may be provided with a concave shape, and the one-way spraying of the protective gas can effectively take away the air in the concave groove). As the welding head 207 continuously descends and contacts the surface of the aluminum plate, the solenoid valves provided in the spray box 412 are all opened to spray the protective gas, and the air in the area where the welding head 207 contacts the aluminum plate is replaced with the protective gas (argon gas) and the welding area is fully protected. Argon gas is an inert gas that does not react with aluminum or welding materials, and can effectively remove oxygen from the air to avoid the formation of aluminum oxide film. At the same time, the sprayed argon gas can form an airflow in the welding area to take away the heat generated by welding, thereby helping to keep the welding temperature within an appropriate range and preventing oxidation caused by overheating;

[0045] When the lifting box 204 is driven to descend, the fixed tooth plate 401 is driven to descend, and the fixed tooth plate 401 drives the connecting plate 402 to descend. The descending connecting plate 402 drives the linkage compression plate 405 to compress the second airbag 407, so that the air inside the second airbag 407 is transported to the inside of the third airbag 415 through the ventilation pipe 408. Prior to this, the descending distance of the lifting box 204 has been limited by the aluminum plate with a certain thickness. Therefore, when the aluminum plate is thicker, the lifting box 204 is driven to descend a shorter distance. When the aluminum plate is thinner, the lifting box 204 descends a longer distance. Therefore, the lifting box 204 descends and drives the lifting tooth plate 404 to drive the linkage compression plate 405 to compress the second airbag 407. The air flow delivered by the As the thickness of the aluminum plate changes, the inside of the third airbag 415 will expand by delivering air. The third airbag 415 is annular, and the expanded third airbag 415 will reduce the inner wall diameter. A thicker aluminum plate will make the inner wall diameter of the third airbag 415 larger, so that the flow rate of the protective gas delivered through the external tube 413 will increase (a thicker aluminum plate may require a longer time of spot welding to melt, so that a larger flow rate of the protective gas can effectively protect and conduct heat), and a thinner aluminum plate will make the inner wall diameter of the third airbag 415 smaller, so that the flow rate of the protective gas delivered through the external tube 413 will decrease (a thinner aluminum plate may require a shorter time of spot welding to melt, so that a smaller flow rate of the protective gas can effectively protect and conduct heat).

[0046] When the welding head 207 heats and melts the aluminum plate, the welding head 207 continues to apply pressure, and the actual pressure will penetrate the molten aluminum plate and be transmitted to the pressure sensor 315. The upper end surface of the pressure sensor 315 is flush with the upper end surface of the lifting base 312. After detecting the pressure, the pressure sensor 315 will send a signal to the controller. After detecting the signal, the controller will control the electromagnet 314 to cut off the power. The electromagnet 314 with the power cut off will stop magnetically adsorbing with the iron block 311, and let the lifting base 312 drive the clamped aluminum plate to slide down, so as to avoid the welding head 207 from applying excessive pressure to the aluminum plate, resulting in welding failure of the spot welding part of the aluminum plate, and at the same time facilitate the replacement of the spot welding position of the aluminum plate, and the controller will send a signal to the first telescopic member 202, so that the first telescopic member 202 drives the welding head 207 to rise, and repeat the above process for the next spot welding.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aluminum spot welding gun for welding, characterized in that: include: Gun body; A lifting welding assembly, the lifting welding assembly comprising a welding head driven to lift and lower for spot welding the aluminum plate; A fixed positioning component, which is used to fix the aluminum plate and limit the lifting height of the welding head; An oxidation reduction component, the oxidation reduction component includes a sliding plate that is driven to rise and fall, the sliding plate is fixedly connected to the outer wall of the welding head and is located at a lower position, the lower end surface of the sliding plate is symmetrically equipped with two arc-shaped injection boxes that are coaxially arranged with the welding head, the inner arc surfaces of the two injection boxes are provided with air outlets at a lower position, the outer arc surfaces of the two injection boxes are connected with an external pipe, the external pipe is embedded with an electromagnetic valve, and the external pipe is externally connected to a shielding gas source; A U-shaped frame is fixedly installed on the upper end surface of the gun body, a first telescopic member is embedded in the U-shaped frame, the first telescopic member is electrically connected to a controller, a lifting rod is fixedly installed on the output end of the first telescopic member, a lifting box is fixedly installed on the lower end of the lifting rod, the lower part of the inner wall of the lifting box is fixedly connected to the welding head, the welding head passes through the lifting box and extends to the bottom thereof, a resistance heating element is fixedly installed on the outer wall of the welding head and at an upper position, a temperature detection element is fixedly installed on the outer wall of the welding head and at a middle position, and the resistance heating element and the temperature detection element are electrically connected to the controller; A second fixing plate is fixedly installed on the outer wall of the welding head and above the sliding plate, a second spring is fixedly installed between the second fixing plate and the sliding plate, an inflatable box is embedded in the external pipe, and a third airbag is fixedly installed on the inner wall of the inflatable box; A mounting frame is fixedly mounted on one side of the gun body close to the sliding sheet, a second air bag is fixedly mounted on one side of the mounting frame close to the sliding sheet, the second air bag is driven to be compressed, two sides of the second air bag are connected with ventilation pipes, an end of the ventilation pipe away from the second air bag passes through the inflation box and is connected with the third air bag; Fixed tooth plates are fixedly installed on both sides of the lifting box, two connecting plates are fixedly installed on both sides of the fixed tooth plates, and linkage compression plates are fixedly installed on the lower ends of the two connecting plates, and the linkage compression plates are fixedly connected to the upper end surface of the second airbag.

2. An aluminum spot welding gun for welding according to claim 1, characterized in that: A second telescopic member is fixedly installed on the lower end surface of the gun body, the telescopic end of the second telescopic member passes through the gun body and is fixedly installed with a connecting head, a telescopic clamp is damped and slidably installed in the connecting head, an L-shaped connecting rod is fixedly installed on the side of the connecting head away from the telescopic clamp, a corrugated telescopic tube is fixedly installed on the upper end surface of the gun body, the corrugated telescopic tube is coaxially sleeved on the outer wall of the lifting rod, the corrugated telescopic tube is filled with hydraulic oil, a first fixing plate is fixedly installed on the upper end of the corrugated telescopic tube, a first spring is fixedly installed in the corrugated telescopic tube, the two ends of the first spring are respectively fixed to the corrugated telescopic tube and the first fixing plate, a first airbag is fixedly installed on the upper end surface of the gun body and at a position away from the corrugated telescopic tube, a liquid-blocking ventilation membrane is embedded on the upper end surface of the first airbag, the first airbag is connected to the corrugated telescopic tube through a connecting pipe, a linkage frame is fixedly installed on the outer wall of the first fixing plate, and the lower end surface of the linkage frame is fixed to the L-shaped connecting rod.

3. The aluminum spot welding gun for welding according to claim 1, characterized in that: A lifting base is slidably installed on the lower end surface of the gun body, and a pressure sensor is embedded on the upper end surface of the lifting base. The pressure sensor is connected to the input signal of the controller. Two external brackets are symmetrically installed on the outer wall of the lifting base and at a lower position. Electromagnets are fixedly installed on the upper end surfaces of the two external brackets. Two iron blocks are symmetrically installed on the lower end surface of the gun body. The electromagnets are magnetically connected to the iron blocks, and the electromagnets are electrically connected to the controller.

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