Automobile coaxial air conditioner pipe welding tool

Abstract

The application relates to a coaxial air conditioner pipe welding tool for a vehicle, which comprises a bottom plate and a clamping assembly. The clamping assembly comprises a support, a rotating disc, a fixing piece and a clamping piece. The support is connected to the bottom plate and is provided with a welding port. The rotating disc is coaxially arranged with the welding port and is rotationally connected to the support. The rotating axis of the rotating disc is collinear with the axis of the welding port. The rotating disc is coaxially provided with a through port. The welding port and the through port are used for passing the coaxial air conditioner pipe. The fixing piece and the clamping piece are both connected to the rotating disc and are used for jointly clamping the coaxial air conditioner pipe so that the axis of the coaxial air conditioner pipe is collinear with the axis of the through port. The coaxial air conditioner pipe is arranged between the fixing piece and the clamping piece. The fixing piece and the clamping piece jointly clamp the coaxial air conditioner pipe and make the coaxial air conditioner pipe coaxial with the through port. The coaxial air conditioner pipe extends out of the through port and the welding port. A welding gun is aligned with the position to be welded. The rotating disc is driven to rotate. The welding gun uniformly welds between the inner pipe and the outer pipe, thereby improving the welding quality.

Description

Technical Field

[0001] This application relates to the field of automotive parts, and in particular to a welding fixture for automotive coaxial air conditioning pipes. Background Technology

[0002] As people become increasingly environmentally conscious, R134a refrigerant, widely used in automotive air conditioning systems due to its high global warming potential (GWP=1300), is gradually being replaced by the new generation refrigerant R1234yf. However, R1234yf's cooling capacity is slightly insufficient compared to R134a. Therefore, it is necessary to introduce coaxial air conditioning pipes (intermediate heat exchanger IHX) into automotive air conditioning systems to compensate for the insufficient cooling capacity of R1234yf by increasing the subcooling at the expansion valve inlet and raising the compressor suction temperature.

[0003] The coaxial air conditioning pipe in automobiles effectively utilizes the low-pressure pipe to transfer heat from the high-pressure pipe. The inner pipe contains a low-temperature, low-pressure refrigerant at 5-10 degrees Celsius, while the outer pipe contains a high-temperature, high-pressure refrigerant at 70-80 degrees Celsius. Heat from the high-temperature pipe is transferred to the low-temperature pipe, achieving secondary heat exchange in the air conditioning system and improving the cooling efficiency of the air conditioner.

[0004] To prevent refrigerant leakage at both ends of the coaxial tube, the inner circumferences of both ends of the outer tube are typically coaxially welded to the outer circumference of the inner tube. A welding machine generally consists of a frame with a welding torch and a worktable. The worktable holds the workpiece, and the welding torch processes it. For circumferential welds with high coaxiality, the instability of manual handling during the process of moving the welding torch makes it difficult to control the weld quality. Summary of the Invention

[0005] To improve welding quality, this application provides a welding fixture for automotive coaxial air conditioning pipes.

[0006] The welding fixture for automotive coaxial air conditioning pipes provided in this application adopts the following technical solution:

[0007] A welding fixture for automotive coaxial air conditioning pipes includes a base plate and a clamping assembly. The clamping assembly includes a bracket, a turntable, a fixing member, and a clamping member. The bracket is connected to the base plate and has a welding port. The turntable is coaxially arranged with the welding port and is rotatably connected to the bracket. The rotation axis of the turntable is collinear with the axis of the welding port. The turntable is coaxially provided with a through-hole. Both the welding port and the through-hole are used for the coaxial air conditioning pipe to pass through. The fixing member and the clamping member are both connected to the turntable and are used to clamp the coaxial air conditioning pipe together, so that the axis of the coaxial air conditioning pipe is collinear with the axis of the through-hole.

[0008] By adopting the above technical solution, the coaxial air conditioning pipe is placed between the fixing component and the clamping component. The fixing component and the clamping component together clamp the coaxial air conditioning pipe and make the coaxial air conditioning pipe coaxial with the through-hole. The coaxial air conditioning pipe extends from the through-hole and the welding port. The welding gun is used to aim at the place to be welded, and the turntable is driven to rotate. The welding gun evenly welds the inner pipe and the outer pipe, thereby improving the welding quality.

[0009] Preferably, the bracket has an annular groove on the side facing the turntable, the annular groove is coaxially arranged with the welding joint, and the turntable has a ring body coaxially arranged on the side facing the annular groove, the ring body being slidably embedded in the annular groove.

[0010] By adopting the above technical solution, the ring body is slidably embedded in the ring groove, and the ring groove guides the rotation of the turntable, making it easier to control the rotation axis of the turntable to be collinear with the weld joint.

[0011] Preferably, the fixing member has a positioning groove at one end facing the through-hole axis, and the clamping member has a limiting groove at one end facing the through-hole axis. Both the positioning groove and the limiting groove are used for embedding the coaxial air conditioning pipe.

[0012] By adopting the above technical solution, the positioning groove facilitates the placement of the coaxial air conditioning pipe, ensuring the relative position of the coaxial air conditioning pipe and the welding torch is determined. This ensures that when the coaxial air conditioning pipe is placed, the welding torch is precisely positioned at the gap between the inner and outer pipes. The limiting groove limits the coaxial air conditioning pipe, preventing it from easily falling off the clamping assembly after the fixing and clamping components have secured it. Furthermore, it prevents the coaxial air conditioning pipe from moving relative to the clamping assembly, ensuring that the relative position of the welding torch and the coaxial air conditioning pipe remains unchanged during the rotation of the turntable, thus improving welding quality.

[0013] Preferably, the fixing member is fixedly connected to the turntable, and the clamping member includes a clamping block. The clamping block is slidably connected to one end of the turntable away from the bracket. The sliding direction of the clamping block is along the radial direction of the turntable. The fixing member and the clamping block are used to jointly clamp the coaxial air conditioning pipe.

[0014] By adopting the above technical solution, the clamping block is moved away from the axis of the opening, and then the coaxial air conditioning pipe is placed on the fixing part. This reduces the interference of the clamping block on the placement of the coaxial air conditioning pipe. After placement, the clamping block is moved to clamp the coaxial air conditioning pipe together with the fixing part. The operation is simple and convenient for installing the coaxial air conditioning pipe.

[0015] Preferably, the clamping member further includes an abutment block and a first spring. The abutment block is fixedly connected to one end of the turntable away from the bracket. The abutment block is located on the side of the clamping block away from the through-hole axis. One end of the first spring is connected to the abutment block, and the other end of the first spring is connected to the clamping block.

[0016] By adopting the above technical solution, the first spring facilitates the automatic reset of the clamping block, reducing the number of operation steps for workers. In addition, the first spring facilitates the clamping block and the fixing component to clamp the coaxial air conditioning pipe together, improving the stability of the coaxial air conditioning pipe fixation and improving the welding quality.

[0017] Preferably, the turntable has a guide groove at one end away from the support, the length direction of the guide groove is along the radial direction of the turntable, and the clamping block has a guide block at one end facing the turntable, the guide block is slidably embedded in the guide groove, and the sliding direction of the guide block is parallel to the length direction of the guide groove.

[0018] By adopting the above technical solution, the guide groove guides the sliding of the guide block, which facilitates the sliding of the first spring-driven clamping block and the fixing parts to clamp the coaxial air conditioning pipe together, making the operation simple and improving the welding efficiency.

[0019] Preferably, it further includes a locking post. The fixing component includes a fixing block and a connecting plate. The fixing block is fixedly connected to the end of the turntable away from the bracket. The fixing block and the clamping block are used to clamp the coaxial air conditioning pipe together. The connecting plate is connected to the end of the fixing block near the clamping block. The connecting plate has a through-hole. The length direction of the through-hole is parallel to the sliding direction of the clamping block. The end of the clamping block facing the connecting plate is connected to a connecting post. The through-hole is used for the connecting post to pass through. The end of the connecting post passing through the through-hole has a locking port. The length direction of the locking port is parallel to the end face of the connecting plate away from the clamping block. The locking post is used to connect to the inner wall of the locking port.

[0020] By adopting the above technical solution, the coaxial air conditioning pipe is placed on the fixed block, and the clamping block is controlled to slide so that the connecting column passes through the through hole. The locking column slides into the locking hole to lock the connecting column and the connecting plate, so that the coaxial air conditioning pipe is not easy to move during the rotation of the turntable, thus improving the welding quality.

[0021] Preferably, it also includes a second spring. The end face of the connecting plate away from the clamping block is radially opposite to the turntable. The end of the fixing block facing the connecting plate is provided with a sliding groove. The length direction of the sliding groove is parallel to the length direction of the locking port. One end of the second spring is connected to the bottom of the sliding groove, and the other end of the second spring is connected to the locking pin.

[0022] By adopting the above technical solution, centrifugal force is generated during the rotation of the turntable. Under the influence of the centrifugal force of the turntable, the locking column overcomes the spring force and extends into the locking port to automatically lock the connecting column and the connecting plate. The operation is simple and improves welding efficiency and welding quality.

[0023] Preferably, the outer diameter of the locking pin decreases as it moves further away from the bottom of the sliding groove.

[0024] By adopting the above technical solution, it is easy for the locking pin to align with the locking port and pass through the locking port to lock the connecting pin and the connecting plate, and the second spring can press the locking pin against the inner wall of the locking port, making the locking stable and improving the welding quality.

[0025] Preferably, the turntable has teeth on its outer periphery, the gear is rotatably connected to the bracket, the rotation axis of the gear is parallel to the axis of the opening, and the outer periphery of the gear meshes with the teeth.

[0026] By adopting the above technical solution, the rotation of the gears drives the turntable to rotate, which is simple to operate and easy to control.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. Place the coaxial air conditioning pipe between the fixing component and the clamping component. The fixing component and the clamping component together clamp the coaxial air conditioning pipe and make the coaxial air conditioning pipe coaxial with the through-hole. The coaxial air conditioning pipe extends from the through-hole and the welding port. Use the welding gun to aim at the place to be welded, drive the turntable to rotate, and the welding gun will evenly weld between the inner pipe and the outer pipe to improve the welding quality.

[0029] 2. The positioning groove facilitates the placement of the coaxial air conditioning pipe, ensuring the relative position of the coaxial air conditioning pipe and the welding torch is determined. This ensures that when the coaxial air conditioning pipe is placed, the welding torch is precisely positioned at the gap between the inner and outer pipes. The limiting groove limits the coaxial air conditioning pipe, preventing it from easily falling off the clamping assembly after the fixing and clamping components have secured it. It also prevents the coaxial air conditioning pipe from moving relative to the clamping assembly, ensuring that the relative position of the welding torch and the coaxial air conditioning pipe remains unchanged during the rotation of the turntable, thus improving the welding quality.

[0030] 3. During the rotation of the turntable, centrifugal force is generated. Under the influence of the centrifugal force of the turntable, the locking pin overcomes the spring force and extends into the locking port to automatically lock the connecting pin and the connecting plate. The operation is simple and improves welding efficiency and welding quality. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a welding fixture for automotive coaxial air conditioning pipes.

[0032] Figure 2 This is a schematic diagram of the internal structure of a welding fixture for a coaxial air conditioning pipe in an automobile after it has been cut open.

[0033] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0034] Figure 4 This is a schematic diagram of the internal structure of a welding fixture for automotive coaxial air conditioning pipes after being cut open, mainly used to demonstrate the clamping components.

[0035] Figure 5 This is a cross-sectional view of a welding fixture for automotive coaxial air conditioning pipes.

[0036] Explanation of reference numerals in the attached drawings: 1. Base plate; 2. Clamping assembly; 21. Bracket; 211. Welding joint; 212. Annular groove; 22. Turntable; 221. Ring body; 222. Through-hole; 223. Guide groove; 224. Tooth; 23. Fixing component; 231. Fixing block; 2311. Positioning groove; 2312. Sliding groove; 232. Connecting plate; 2321. Through-hole; 24. Clamping component; 241. Clamping block; 2411. Guide block; 2412. Limiting groove; 2413. Connecting post; 2414. Locking port; 242. Abutment block; 243. First spring; 3. Locking component; 31. Locking post; 32. Second spring; 4. Driving component; 41. Drive motor; 42. Drive shaft; 43. Gear; 5. Welding torch. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0038] This application discloses a welding fixture for automotive coaxial air conditioning pipes. (Refer to...) Figure 1 A welding fixture for automotive coaxial air conditioning pipes includes a base plate 1, a clamping assembly 2, a locking component 3, a driving component 4, and a welding torch 5. The clamping assembly 2 is provided in two parts, including a bracket 21, a turntable 22, a fixing component 23, and a clamping component 24.

[0039] Reference Figure 2 and Figure 3 Two supports 21 are fixedly connected to both ends of the base plate 1, and the supports 21 are perpendicular to the base plate 1. Each support 21 has a welding joint 211, and the two welding joints 211 are coaxially arranged. One end of the support 21 facing the other support 21 has an annular groove 212, which is coaxial with the welding joint 211. The inner diameter of the annular groove 212 is larger than the inner diameter of the welding joint 211. A turntable 22 is coaxially arranged with the welding joint 211. One end of the turntable 22 facing the annular groove 212 has a ring body 221, which is slidably embedded in the annular groove 212. The annular groove 212 is a trapezoidal groove, and the cross-section of the ring body 221 is trapezoidal along the axial direction of the ring body 221. The turntable 22 is attached to the bracket 21 on the side facing the annular groove 212. The turntable 22 is coaxially provided with a through-hole 222. The inner diameter of the through-hole 222 is equal to the inner diameter of the welded joint 211 and is larger than the outer diameter of the coaxial air conditioning pipe. Both the welded joint 211 and the through-hole 222 are used for the coaxial air conditioning pipe to pass through. The rotation axis of the turntable 22 is collinear with the axis of the through-hole 222.

[0040] Reference Figure 3 and Figure 4The fixing member 23 includes a fixing block 231 and a connecting plate 232, and the clamping member 24 includes a clamping block 241, an abutment block 242, and a first spring 243. The turntable 22 has a guide groove 223 at one end away from the bracket 21. The guide groove 223 is a trapezoidal groove, and its length direction is along the radial direction of the turntable 22. The clamping block 241 has a guide block 2411 at one end facing the turntable 22. The cross-section of the guide block 2411 is trapezoidal, and the guide block 2411 is slidably embedded in the guide groove 223. The sliding direction of the guide block 2411 is parallel to the length direction of the guide groove 223.

[0041] Reference Figure 3 and Figure 4 A fixing block 231 is fixedly connected to the end of the turntable 22 away from the bracket 21. The end of the fixing block 231 facing the axis of the opening 222 is provided with a positioning groove 2311, and the end of the clamping block 241 facing the axis of the opening 222 is provided with a limiting groove 2412. Both the positioning groove 2311 and the limiting groove 2412 are used for the insertion of the end of the outer tube, so that the axis of the outer tube is collinear with the axis of the turntable 22. The fixing block 231 and the clamping block 241 are used to clamp the coaxial air conditioning pipe together. An abutment block 242 is fixedly connected to the end of the turntable 22 away from the bracket 21. The abutment block 242 is located on the side of the clamping block 241 away from the axis of the opening 222. One end of the first spring 243 is fixedly connected to the abutment block 242, and the other end of the first spring 243 is fixedly connected to the clamping block 241.

[0042] Reference Figure 5 The connecting plate 232 is fixedly connected to the end of the fixing block 231 near the clamping block 241. There are two connecting plates 232, which are located on both sides of the guide groove 223. The length direction of the connecting plate 232 away from the clamping block 241 is along the radial direction of the turntable 22. The connecting plate 232 is provided with a through hole 2321, the axis of which is parallel to the length direction of the guide groove 223. The clamping block 241 is connected to a connecting post 241 at the end facing the connecting plate 232. 3. The axis of the connecting post 2413 is parallel to the length direction of the guide groove 223. The end of the connecting post 2413 away from the abutment block 242 is provided with a rounded corner. The through hole 2321 is used for the connecting post 2413 to pass through. The outer wall of the connecting post 2413 is slidably connected to the inner wall of the through hole 2321. The end of the connecting post 2413 passing through the through hole 2321 is provided with a locking hole 2414. The axis of the locking hole 2414 is parallel to the length direction of the end of the connecting plate 232 away from the clamping block 241.

[0043] Reference Figure 5The locking component 3 includes a locking pin 31 and a second spring 32. The fixing block 231 has a sliding groove 2312 at one end facing the connecting plate 232. The axis of the sliding groove 2312 is collinear with the axis of the locking port 2414. One end of the second spring 32 is fixedly connected to the bottom of the sliding groove 2312, and the other end of the second spring 32 is fixedly connected to the locking pin 31. The outer diameter of the locking pin 31 decreases as it moves away from the second spring 32. The outer wall of the locking pin 31 is used to slide and connect to the inner wall of the locking port 2414.

[0044] Reference Figure 2 and Figure 3 The driving component 4 includes a drive motor 41, a drive shaft 42, and a gear 43. The motor housing of the drive motor 41 is fixedly connected to one end of a bracket 21 away from the other bracket 21. The motor shaft of the drive motor 41 is coaxially fixedly connected to the drive shaft 42. The two ends of the drive shaft 42 are rotatably connected to the two brackets 21 respectively. The rotation axis of the drive shaft 42 is parallel to the axis of the through port 222. The gear 43 is located between the two brackets 21 and is coaxially fixedly connected to the outer periphery of the drive shaft 42. There are two gears 43, which are respectively attached to the two brackets 21. The outer periphery of the turntable 22 is provided with teeth 224, and the outer periphery of the gear 43 meshes with the teeth 224.

[0045] Reference Figure 1 The welding torch 5 is fixedly connected to the end of the bracket 21 away from the other bracket 21, and the nozzle of the welding torch 5 is aimed at the joint between the inner tube and the outer tube.

[0046] The implementation principle of the welding fixture for a coaxial air conditioning pipe in this application embodiment is as follows: The coaxial air conditioning pipe is passed through a welding port 211, a through port 222, another through port 222, and another welding port 211 in sequence. The fixing block 231 is moved to the end away from the axis of the through port 222, and the two ends of the outer pipe are respectively embedded in the positioning groove 2311. At this time, the two ends of the coaxial air conditioning pipe are respectively located in the two welding ports 211. The first spring 243 restores its deformation and pushes the fixing block 231 to slide, so that the connecting post 2413 extends into the through port 2321. At this time, the fixing block 231 and the clamping block 241 together clamp the two ends of the coaxial air conditioning pipe. Turn on the drive motor 41, which controls the drive shaft 42 to rotate. The gear 43 rotates and meshes with the teeth 224, thereby driving the turntable 22 to rotate. The rotation of the turntable 22 generates centrifugal force. Affected by the centrifugal force, the locking pin 31 overcomes the elastic force of the second spring 32 and extends into the locking port 2414, locking the fixing block 231 and the clamping block 241. Turn on the welding gun 5 to weld the joint between the inner and outer tubes. After the welding is completed, turn off the welding gun 5 and the drive motor 41. The second spring 32 returns to its deformation, the locking pin 31 resets, and the clamping block 241 slides away from the axis of the port 222 to remove the processed coaxial air conditioning pipe.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A welding fixture for automotive coaxial air conditioning pipes, characterized in that: The utility model relates to a coaxial air conditioner pipe clamping device, including bottom plate (1) and clamping assembly (2), clamping assembly (2) includes support (21), carousel (22), fixed part (23) and clamping part (24), support (21) is connected to bottom plate (1), support (21) is equipped with welding interface (211), carousel (22) is coaxial with welding interface (211) and is arranged, carousel (22) rotation is connected to support (21), the rotation axis of carousel (22) is collinear with the axis of welding interface (211), carousel (22) is coaxial and is equipped with mouth (222), welding interface (211) and mouth (222) are all used for for coaxial air conditioner pipe to pass through, fixed part (23) and clamping part (24) are all connected to carousel (22), fixed part (23) and clamping part (24) are used for together clamping coaxial air conditioner pipe, so that the axis of coaxial air conditioner pipe is collinear with the axis of mouth (222); The utility model relates to a coaxial air conditioner pipe clamping device, including bottom plate (1) and clamping assembly (2), clamping assembly (2) includes support (21), carousel (22), fixed part (23) and clamping part (24), support (21) is connected to bottom plate (1), support (21) is equipped with welding interface (211), carousel (22) is coaxial with welding interface (211) and is arranged, carousel (22) rotation is connected to support (21), the rotation axis of carousel (22) is collinear with the axis of welding interface (211), carousel (22) is coaxial and is equipped with mouth (222), welding interface (211) and mouth (222) are all used for for coaxial air conditioner pipe to pass through, fixed part (23) and clamping part (24) are all connected to carousel (22), fixed part (23) and clamping part (24) are used for together clamping coaxial air conditioner pipe, so that the axis of coaxial air conditioner pipe is collinear with the axis of mouth (222); The utility model relates to a coaxial air conditioner pipe clamping device, including bottom plate (1) and clamping assembly (2), clamping assembly (2) includes support (21), carousel (22), fixed part (23) and clamping part (24), support (21) is connected to bottom plate (1), support (21) is equipped with welding interface (211), carousel (22) is coaxial with welding interface (211) and is arranged, carousel (22) rotation is connected to support (21), the rotation axis of carousel (22) is collinear with the axis of welding interface (211), carousel (22) is coaxial and is equipped with mouth (222), welding interface (211) and mouth (222) are all used for for coaxial air conditioner pipe to pass through, fixed part (23) and clamping part (24) are all connected to carousel (22), fixed part (23) and clamping part (24) are used for together clamping coaxial air conditioner pipe, so that the axis of coaxial air conditioner pipe is collinear with the axis of mouth (222); The utility model relates to a coaxial air conditioner pipe clamping device, including bottom plate (1) and clamping assembly (2), clamping assembly (2) includes support (21), carousel (22), fixed part (23) and clamping part (24), support (21) is connected to bottom plate (1), support (21) is equipped with welding interface (211), carousel (22) is coaxial with welding interface (211) and is arranged, carousel (22) rotation is connected to support (21), the rotation axis of carousel (22) is collinear with the axis of welding interface (211), carousel (22) is coaxial and is equipped with mouth (222), welding interface (211) and mouth (222) are all used for for coaxial air conditioner pipe to pass through, fixed part (23) and clamping part (24) are all connected to carousel (22), fixed part (23) and clamping part (24) are used for together clamping coaxial air conditioner pipe, so that the axis of coaxial air conditioner pipe is collinear with the axis of mouth (222); The utility model relates to a coaxial air conditioner pipe clamping device, including bottom plate (1) and clamping assembly (2), clamping assembly (2) includes support (21), carousel (22), fixed part (23) and clamping part (24), support (21) is connected to bottom plate (1), support (21) is equipped with welding interface (211), carousel (22) is coaxial with welding interface (211) and is arranged, carousel (22) rotation is connected to support (21), the rotation axis of carousel (22) is collinear with the axis of welding interface (211), carousel (22) is coaxial and is equipped with mouth (222), welding interface (211) and mouth (222) are all used for for coaxial air conditioner pipe to pass through, fixed part (23) and clamping part (24) are all connected to carousel (22), fixed part (23) and clamping part (24) are used for together clamping coaxial air conditioner pipe, so that the axis of coaxial air conditioner pipe is collinear with the axis of mouth (222); The utility model relates to a coaxial air conditioner pipe clamping device, including bottom plate (1) and clamping assembly (2), clamping assembly (2) includes support (21), carousel (22), fixed part (23) and clamping part (24), support (21) is connected to bottom plate (1), support (21) is equipped with welding interface (211), carousel (22) is coaxial with welding interface (211) and is arranged, carousel (22) rotation is connected to support (21), the rotation axis of carousel (22) is collinear with the axis of welding interface (211), carousel (22) is coaxial and is equipped with mouth (222), welding interface (211) and mouth (222) are all used for for coaxial air conditioner pipe to pass through, fixed part (23) and clamping part (24) are all connected to carousel (22), fixed part (23) and clamping part (24) are used for together clamping coaxial air conditioner pipe, so that the axis of coaxial air conditioner pipe is collinear with the axis of mouth (222) Further comprising a second spring (32), the end face of the connecting plate (232) away from the clamping block (241) is along the radial direction of the rotating disc (22), one end of the fixing block (231) is provided with a sliding groove (2312), the length direction of the sliding groove (2312) is parallel to the length direction of the locking port (2414), one end of the second spring (32) is connected to the groove bottom of the sliding groove (2312), and the other end of the second spring (32) is connected to the locking column (31). The outer diameter of the locking column (31) decreases away from the groove bottom of the sliding groove (2312).

2. The coaxial air-conditioning pipe welding tool for automobile of claim 1, wherein: The side of the support (21) facing the rotating disc (22) is provided with an annular groove (212), the annular groove (212) is coaxially arranged with the welding port (211), the side of the rotating disc (22) facing the annular groove (212) is coaxially provided with an annular body (221), and the annular body (221) is slidingly embedded in the annular groove (212).

3. The coaxial air-conditioning pipe welding tool for automobile of claim 1, wherein: The end of the fixing part (23) facing the axis of the through port (222) is provided with a positioning groove (2311), the end of the clamping part (24) facing the axis of the through port (222) is provided with a limiting groove (2412), and the positioning groove (2311) and the limiting groove (2412) are used for embedding the coaxial air conditioner pipe.

4. The coaxial air conditioning pipe welding tool for automobile of claim 1, wherein: The end of the rotating disc (22) away from the support (21) is provided with a guide groove (223), the length direction of the guide groove (223) is along the radial direction of the rotating disc (22), the end of the clamping block (241) facing the rotating disc (22) is provided with a guide block (2411), the guide block (2411) is slidingly embedded in the guide groove (223), and the sliding direction of the guide block (2411) is parallel to the length direction of the guide groove (223).

5. The coaxial air conditioning pipe welding tool for automobile of claim 1, wherein: Further comprising a gear (43), the outer periphery of the rotating disc (22) is provided with a tooth (224), the gear (43) is rotationally connected to the support (21), the rotation axis of the gear (43) is parallel to the axis of the through port (222), and the outer periphery of the gear (43) is engaged with the tooth (224).

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