Automobile chassis welding device

Abstract

The present invention relates to the technical field of automobile welding, and in particular to an automobile chassis welding device, which comprises a frame; a positioning block and a positioning plate are provided on the frame, an axial adjustment member is provided on the frame, and the axial adjustment member can make the positioning block and the positioning plate approach each other or move away from each other; a plurality of connecting blocks are rotatably connected on both sides of the positioning plate, and every two adjacent connecting blocks are connected, and a plurality of the connecting blocks constitute a connecting cover that can be covered at the weld of a workpiece, and a rotating control member for controlling the rotation of the connecting block is provided on the positioning plate, and the first connecting block is connected to an inert gas vent pipe, and a sealing member is provided between every two adjacent connecting blocks. The present invention can accelerate the formation of an inert gas protective layer and slow down the oxidation rate of the weld.

Description

Technical Field

[0001] The invention relates to the technical field of automobile welding, in particular to an automobile chassis welding device. Background Art

[0002] The automobile chassis is an important part of riding a car. It is located at the bottom of the car and is mainly used to support the main components such as the body, engine and transmission, and connect the wheels so that the car can drive. In the production process of the automobile chassis, it is necessary to first process the steel, aluminum alloy, etc. into a preliminary shape, and then weld the processed metal parts. In the welding process of the automobile chassis, the selection of welding sequence and process has an important influence on the welding quality and efficiency. The weld and heat-affected zone react with oxygen in the air to form brittle oxides, which have an adverse effect on the quality of the welding, reduce the mechanical properties at the weld, increase welding defects, affect the appearance quality, and reduce the corrosion resistance at the weld.

[0003] In order to reduce the oxidation of the weld, the welding area should be thoroughly cleaned before welding, oil and other substances that may promote oxidation should be removed, welding parameters should be controlled, and anti-oxidation welding materials should be used. Shielding gas, such as argon gas, carbon dioxide, etc., can also be used to form a protective layer of shielding gas, thereby reducing the oxygen in the air from contacting the weld and slowing down the oxidation rate of the weld. The Chinese invention patent with the authorization announcement number CN112809134B discloses an automated welding equipment for automobile chassis, including a frame, a crossbeam, a welding head, a flipper, a top block and a vent strip, the crossbeam is connected to the frame, the welding head is movably connected to the crossbeam, the welding head welds the chassis, the chassis can be flipped by the flipper, after rough welding on one side of the chassis, spot welding is performed on the back of the chassis, and after the flipper is flipped, the top block and the vent strip spray argon gas outward.

[0004] With respect to the above-mentioned related technologies, the applicant believes that, in the above-mentioned application, air is blown toward the chassis through the top block and the ventilation strip to form an argon protective layer near the weld of the bottom plate rough welding, but the argon protective layer is formed slowly and the weld is oxidized during the blowing process. Summary of the invention

[0005] In order to solve the problems of slow formation of argon protective layer and fast oxidation speed of weld, the present invention provides an automobile chassis welding device.

[0006] The present invention provides an automobile chassis welding device, which adopts the following technical scheme: an automobile chassis welding device, comprising a frame; a positioning block and a positioning plate are provided on the frame, and an axial adjustment member is provided on the frame, and the axial adjustment member can make the positioning block and the positioning plate approach each other or move away from each other; a plurality of connecting blocks are rotatably connected on both sides of the positioning plate, and every two adjacent connecting blocks are connected, and the plurality of connecting blocks constitute a connecting cover that can be covered at the weld of the workpiece, and a rotating control member for controlling the rotation of the connecting block is provided on the positioning plate, and the first connecting block is connected to an inert gas ventilation pipe, and a sealing member is provided between every two adjacent connecting blocks.

[0007] By adopting the above technical solution, the positioning block cooperates with the positioning plate to fix the workpiece, and multiple connecting blocks are connected in pairs to form a connecting cover. The connecting cover can be set at the weld of the workpiece, and the inert gas flows along the internal channel of the connecting cover to reduce the oxygen at the weld of the rough welding, forming an inert gas protective layer, slowing down the oxidation rate of the weld, and being able to quickly form an inert gas protective layer. Compared with the previous direct release of inert gas to the weld, the inert gas is made to flow along the internal channel of the connecting cover, which can make the inert gas gather at the weld, improving the previous situation of inert gas overflowing everywhere, which can better slow down the oxidation rate of the weld and improve the quality of the weld, and can also reduce the amount of inert gas used, weakening the impact of inert gas on the staff. In the process of the inert gas circulating in the connecting cover, the inert gas gradually heats up, which can slow down the cooling rate of the weld and further improve the strength of the workpiece after processing.

[0008] The connection block is rotatably connected to the positioning plate. Before welding, the connection block is rotated upward to facilitate the workers to weld the workpiece and avoid conflicts between devices as much as possible. During the welding process, the connection block in the welded position can be rotated downward in time and covered on the weld. There is no need to wait for all welding to be completed before the connection cover is installed, which speeds up the formation of the inert gas protective layer, slows down the oxidation rate of the workpiece weld, and improves the strength of the workpiece after processing. A seal is set between two adjacent connection blocks. The seal seals the connection block at the end, so that the connection cover can gather inert gas and reduce the overflow of inert gas along the end connection block, thereby improving the anti-oxidation effect of the inert gas protective layer. As the next connection block moves downward, the seal opens the original connection block, allowing the inert gas in the connection cover to flow along the internal channel of the connection cover, controlling the flow of inert gas between the connection blocks, weakening the influence of inert gas on other places to be welded, and improving the stability of the device.

[0009] Optionally, the connecting block is composed of a top plate and two side plates connected to the bottom surface of the top plate, and the two side plates are arranged in parallel.

[0010] By adopting the above technical solution, the structure is simple and easy to install, so that every two adjacent connecting blocks are interconnected, which is convenient for the circulation of inert gas and can reduce the overflow of inert gas.

[0011] Optionally, the seal includes a sealing plate and a movable plate, the sealing plate is provided with a first ventilation hole, the movable plate is provided with a second ventilation hole connected to the first ventilation hole, the bottom surface of the movable plate is connected to a compression spring, and the top of the movable plate is connected to an adjustment rod that abuts against the bottom surface of the top plate of an adjacent connecting block.

[0012] By adopting the above technical solution, when the connecting block rotates downward and contacts the top surface of the workpiece, the compression spring on the bottom surface of the movable plate contacts the top surface of the workpiece. Under the action of the compression spring, the movable plate moves and closes the first vent on the sealing plate, reducing the overflow of the inert gas in the connecting block, so that the sealing gas can gather at the weld. When the next connecting block rotates, the top plate of the next connecting block abuts against the adjustment rod of the previous connecting block, so that the movable plate moves downward, opens the first vent, and the first vent is connected to the second vent, and the inert gas flows along the channel in the connecting cover. The influence of the inert gas on other positions to be welded is weakened, and there is no need to set up an additional power source for controlling the flow of inert gas between the connecting blocks, which is easy to use and improves the degree of automation of the device.

[0013] Optionally, a gap is left between the bottom surface of the sealing plate and the workpiece.

[0014] By adopting the above technical solution, the inert gas in the connection cover can flow in a direction, and the inert gas squeezes the oxygen in the connection cover, so that the oxygen in the connection cover is discharged, and the oxidation rate of the weld is slowed down.

[0015] Optionally, a turning assembly for turning the workpiece is connected to the frame.

[0016] By adopting the above technical solution, the workpiece is turned over, which makes it easier to weld both sides of the workpiece and facilitates the work of the staff.

[0017] Optionally, the flip assembly includes two connection frames, which are respectively arranged on one side of the frame, and the connection frames are rotatably connected to the frame.

[0018] By adopting the above technical solution, two connecting frames are provided, and the connecting frames rotate, thereby driving the workpiece to rotate, thereby improving the stability of the device.

[0019] Optionally, the axial adjustment member is provided with two groups and is respectively connected to one of the connecting frames, the axial adjustment member includes a first screw rod and a second screw rod with opposite threads, the bottom surface of the first screw rod is connected to the top surface of the second screw rod, the first screw rod rotates around its own axis, the two sides of the positioning plate are fixedly connected to the two first screw rods, and the positioning block is provided with two and corresponds one to one with the two second screw rods.

[0020] By adopting the above technical solution, the first screw rod and the second screw rod are rotated to make the positioning block and the positioning plate approach each other or move away from each other. The structure is simple, the device is mature, the stability of the device is improved, the control is convenient, and the accuracy of the device is improved.

[0021] Optionally, a plurality of through holes are opened on the positioning plate, a positioning cover is provided on the positioning plate, the positioning cover is arranged on the through hole, a pressure block is slidably inserted between the inner wall of the positioning cover and the inner wall of the through hole, and a pressure spring is provided between the inner top surface of the positioning cover and the top surface of the pressure block.

[0022] By adopting the above technical solution, when the positioning plate moves toward the workpiece, the pressure block abuts against the workpiece under the action of the pressure spring, and the positioning plate then moves downward and abuts against the workpiece, thereby reducing the bending of the workpiece during processing, improving the stability of the device, and improving the processing effect of the device.

[0023] In summary, the present invention includes the following beneficial technical effects:

[0024] 1. The connecting hood can be set on the weld of the workpiece, and the inert gas flows along the internal channel of the connecting hood to reduce the oxygen at the weld of the rough welding, form an inert gas protective layer, slow down the oxidation rate of the weld, and quickly form an inert gas protective layer. Compared with the previous release of inert gas directly to the weld, the inert gas flows along the internal channel of the connecting hood, which can make the inert gas gather at the weld, improving the previous situation of inert gas overflowing everywhere, which can better slow down the oxidation rate of the weld and improve the quality of the weld, and can also reduce the amount of inert gas used and weaken the impact of inert gas on the workers.

[0025] 2. As the inert gas circulates in the connection hood, the temperature of the inert gas gradually rises, which can slow down the cooling rate of the weld and further improve the strength of the workpiece after processing.

[0026] 3. Before welding, the connection block is rotated upward to facilitate the workers to weld the workpiece and avoid conflicts between devices as much as possible. During the welding process, the connection block in the welded position can be rotated downward and covered on the weld in time. There is no need to wait for all welding to be completed before the connection cover is installed. The formation speed of the inert gas protective layer is accelerated, the oxidation rate of the workpiece weld is slowed down, and the strength of the workpiece after processing is improved.

[0027] 4. Set up seals to control the flow of inert gas between connecting blocks, weaken the impact of inert gas on other places to be welded, improve the stability of the device, improve the degree of automation of the device, and improve processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the flip assembly and the fixing assembly in an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the positioning cover and the pressure spring in the embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the connecting block and the rotation control member in an embodiment of the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the moving plate and the adjusting rod in an embodiment of the present invention;

[0033] Figure 6 It is a cross-sectional schematic diagram of an exploded view of two adjacent connection blocks in an embodiment of the present invention;

[0034] Figure 7 Schematic diagram of the structure of the cylinder and the connecting plate in an embodiment of the present invention.

[0035] Explanation of the accompanying drawings: 1. frame; 11. workpiece; 2. welding part; 21. crossbeam; 22. welding head; 3. flip assembly; 31. rotating disk; 32. connecting frame; 4. fixing assembly; 41. positioning block; 42. positioning plate; 421. through hole; 422. positioning cover; 423. pressure spring; 424. pressure block; 43. axial adjustment member; 431. rotating motor; 432. first screw rod; 433. second screw rod; 5. connecting cover; 6. connecting block; 61. top plate; 62. side plate; 7. rotating control member; 71. cylinder; 72. connecting plate; 8. inert gas ventilation pipe; 9. sealing member; 91. sealing plate; 92. moving plate; 93. compression spring; 94. limiting strip; 95. first ventilation hole; 96. sliding groove; 97. second ventilation hole; 98. limiting groove; 99. adjustment groove; 910. adjustment rod. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0037] The following is combined with Figure 1 -Attached Figure 7 The present invention is described in further detail.

[0038] The embodiment of the present invention discloses a vehicle chassis welding device. Figures 1 to 7 , an automobile chassis welding device includes a frame 1, a welding part 2, a flip component 3, a fixing component 4 and a connecting cover 5.

[0039] Reference Figure 1 , frame 1 is vertically arranged on a horizontal plane.

[0040] Reference Figure 1 and Figure 2 The welding part 2 comprises a crossbeam 21 and a welding head 22. The crossbeam 21 is connected to the bottom surface of the top of the frame 1, and the welding head 22 is slidably connected to the crossbeam 21. The workpiece 11 is welded.

[0041] Reference Figure 1 and Figure 2 The flip assembly 3 includes two rotating disks 31, two connecting frames 32 and two flip motors. The rotating disks 31 are cylindrical in shape and are vertically arranged. The two rotating disks 31 are arranged on one side of the frame 1, and the two rotating disks 31 are arranged in parallel and spaced apart. The two connecting frames 32 are connected to one rotating disk 31, and the flip motor is connected to the frame 1. The output ends of the two flip motors are connected to one rotating disk 31, respectively (the flip motor is not shown in the figure). The workpiece 11 is driven to flip, which is convenient for welding on both sides of the workpiece 11 and convenient for the staff to operate.

[0042] Reference Figure 1 and Figure 2The fixing assembly 4 includes two positioning blocks 41, a positioning plate 42 and two groups of axial adjustment members 43. The two groups of axial adjustment members 43 are respectively connected to a connecting frame 32. The axial adjustment member 43 includes a rotating motor 431, a first screw rod 432 and a second screw rod 433. The first screw rod 432 and the second screw rod 433 are both cylindrical as a whole and vertically arranged. The top surface of the second screw rod 433 is connected to the bottom surface of the first screw rod 432. The first screw rod 432 and the second screw rod 433 are both rotatably connected to the connecting frame 32. The first screw rod 432 and the second screw rod 433 rotate around the axial direction of the first screw rod 432. The rotating motor 431 is connected to the connecting frame 32, the output end of the rotating motor 431 is connected to the top surface of the first screw rod 432, the side wall of the first screw rod 432 is provided with a positive thread, the side wall of the second screw rod 433 is provided with a reverse thread, the two sides of the positioning plate 42 are respectively fixedly connected to a first screw rod 432, the two positioning blocks 41 are respectively connected to a second screw rod 433, the rotating motor 431 is started, and the two positioning blocks 41 and the positioning plate 42 are driven to move axially along the first screw rod 432, one side of the workpiece 11 abuts against the two positioning blocks 41, and the other side of the workpiece 11 abuts against the positioning plate 42. The positioning blocks 41 and the positioning plate 42 cooperate to limit the position of the workpiece 11. When the connecting frame 32 rotates, the positioning blocks 41 and the positioning plate 42 rotate accordingly, and the device is stable.

[0043] Reference Figure 1 , Figure 2 and Figure 3 The positioning plate 42 is provided with a plurality of through holes 421 penetrating the positioning plate 42 in the vertical direction. A plurality of positioning covers 422 respectively covering the through holes 421 are connected to the side of the positioning plate 42 away from the positioning block 41. A pressure spring 423 and a pressure block 424 are arranged inside the positioning cover 422. The interior of the positioning cover 422 is hollow. The pressure block 424 is slidably inserted into the positioning cover 422. The pressure spring 423 is vertically arranged between the top wall inside the positioning cover 422 and the pressure block 424. When the positioning plate 42 moves toward the direction close to the workpiece 11, the pressure block 424 abuts against the workpiece 11 under the action of the pressure spring 423, and the positioning plate 42 continues to move downward and abuts against the workpiece 11, thereby reducing the bending of the workpiece 11 during the processing, improving the stability of the device, and improving the processing effect of the device.

[0044] Reference Figure 1 , Figure 2 and Figure 4, there are two connecting covers 5, which are respectively connected to one side of the positioning plate 42. The connecting covers 5 are filled with inert gas. Compared with the previous release of inert gas directly to the weld, the inert gas is circulated along the internal channel of the connecting cover 5, which can make the inert gas gather at the weld, improving the previous situation of inert gas overflowing everywhere, which can better slow down the oxidation rate of the weld and improve the quality of the weld, and can also reduce the amount of inert gas and weaken the impact of inert gas on the staff. In the process of the inert gas circulating in the connecting cover 5, the inert gas gradually heats up, which can slow down the cooling rate of the weld and further improve the strength of the workpiece 11 after processing.

[0045] Reference Figure 1 , Figure 2 and Figure 4 The connecting cover 5 is composed of a plurality of interconnected connecting blocks 6. A plurality of rotation control members 7 are arranged on the connecting plate 72. The plurality of rotation control members 7 correspond to the plurality of connecting blocks 6 one by one. The rotation control member 7 includes a cylinder 71. (In order to more clearly show the positional relationship of the connecting blocks 6 in this embodiment, Figure 1 and Figure 2 Cylinder 71 is not shown in FIG. Figure 7 One end of the cylinder 71 is hinged to the top surface of the positioning plate 42, a connecting plate 72 is provided between the connecting block 6 and the positioning plate 42, one side of the connecting plate 72 is hinged to the positioning plate 42, and the output end of the cylinder 71 is hinged to the top surface of the connecting plate 72. An inert gas box is connected to each of the two rotating disks 31, and the connecting block 6 close to the inert gas box is connected to the inert gas box through an inert gas ventilation pipe 8 (wherein the inert gas box is not shown in the figure), and the inert gas box injects inert gas into the connecting block 6 through the inert gas ventilation pipe 8, and the inert gas is such as helium, argon, etc. The connecting block 6 is rotatably connected to the positioning plate 42. Before welding, the connecting block 6 is rotated upward to facilitate the staff to weld the workpiece 11 and avoid conflicts between devices as much as possible. During the welding process, the connecting block 6 in the welded position can be rotated downward in time and covered on the weld. There is no need to wait for all welding to be completed before putting on the connecting cover 5, which speeds up the formation of the inert gas protective layer, slows down the oxidation rate of the weld of the workpiece 11, and improves the strength of the workpiece 11 after processing.

[0046] Reference Figure 1 and Figure 4 The connecting block 6 includes a top plate 61 and two side plates 62. The multiple connecting blocks 6 are arranged along the long side direction of the positioning plate 42. The two side plates 62 are both connected to the bottom surface of the top plate 61. The two side plates 62 are arranged in parallel in the wide side direction of the positioning plate 42.

[0047] Reference Figure 1 , Figure 4 , Figure 5 and Figure 6A sealing member 9 is provided between two adjacent connecting blocks 6. The sealing member 9 includes a sealing plate 91, a movable plate 92, two compression springs 93 and two limit strips 94. The sealing plate 91 is provided between the two side plates 62 and connected to the bottom surface of the top plate 61. A first vent hole 95 is provided on the sealing plate 91. A sliding groove 96 extending in the vertical direction is provided on the top plate 61. The movable plate 92 is slidably inserted in the sliding groove 96. A second vent hole 97 is provided on the movable plate 92. The second vent hole 97 is connected to the first vent hole 95. Two side plates 62 are provided with a vertically extending sliding groove 96. The movable plate 92 has a limit groove 98 extending therefrom, two limit strips 94 are respectively connected to one side of the movable plate 92 and are respectively slidably inserted into a limit groove 98, two compression springs 93 are both connected to the bottom surface of the movable plate 92, and an adjustment groove 99 extending along the vertical direction is provided on the top surface of the sealing plate 91. An adjustment rod 910 is connected to the movable plate 92, one end of the adjustment rod 910 extends out of the adjustment groove 99 and is slidably inserted into the adjustment groove 99, the top plate 61 of the adjacent connecting block 6 abuts against the adjusting rod 910, and when the connecting block 6 abuts against the workpiece 11, the movable plate 92 closes the first vent 95.

[0048] Reference Figure 1 , Figure 4 , Figure 5 and Figure 6 The seal 9 seals the connection block 6 at the end, so that the connection cover 5 can gather the inert gas, reduce the overflow of the inert gas along the end connection block 6, and thus improve the anti-oxidation effect of the inert gas protective layer. As the next connection block 6 moves downward, the seal 9 opens the original connection block 6, so that the inert gas in the connection cover 5 flows along the internal channel of the connection cover 5, controls the flow of the inert gas between the connection blocks 6, weakens the influence of the inert gas on other places to be welded, and improves the stability of the device.

[0049] The implementation principle of an automobile chassis welding device according to an embodiment of the present invention is as follows: start the flip motor, adjust the position of the connection frame 32, so that the connection frame 32 is set vertically, the positioning plate 42 is located above the positioning block 41, the workpiece 11 is placed on the two positioning blocks 41, the rotating motor 431 is started, the positions of the two positioning blocks 41 and the positioning plate 42 are adjusted, the position of the workpiece 11 relative to the connection frame 32 is limited, the workpiece 11 is roughly welded by the welding head 22, and after the rough welding, the connection block 6 is controlled to rotate by the cylinder 71 so that the connection block 6 is sleeved on the rough welding weld. The inert gas in the inert gas box enters into the connection block 6 through the inert gas ventilation pipe 8 and forms an inert gas protective layer at the weld. When the adjacent connection blocks 6 rotate, they abut against the adjusting rod 910 and open the first ventilation hole 95, so that the inert gas circulates between the connection blocks 6. After the rough welding, the flip motor is started to flip the workpiece 11, and fine welding is performed on the other side of the workpiece 11. After the welding is completed, the rotating motor 431 is started to remove the workpiece 11.

[0050] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automobile chassis welding device, comprising a frame (1), characterized in that: The frame (1) is provided with a positioning block (41) and a positioning plate (42), and the frame (1) is provided with an axial adjustment member (43), and the axial adjustment member (43) can make the positioning block (41) and the positioning plate (42) approach each other or move away from each other; A plurality of connection blocks (6) are rotatably connected to both sides of the positioning plate (42), and every two adjacent connection blocks (6) are connected. The plurality of connection blocks (6) form a connection cover (5) that can be arranged on a weld of a workpiece (11). A rotation control member (7) for controlling the rotation of the connection block (6) is provided on the positioning plate (42). The first connection block (6) is connected to an inert gas ventilation pipe (8), and a sealing member (9) is provided between every two adjacent connection blocks (6); The connecting block (6) is composed of a top plate (61) and two side plates (62) connected to the bottom surface of the top plate (61), and the two side plates (62) are arranged in parallel; The sealing member (9) comprises a sealing plate (91) and a movable plate (92); the sealing plate (91) is provided with a first vent hole (95); the movable plate (92) is provided with a second vent hole (97) connected to the first vent hole (95); the bottom surface of the movable plate (92) is connected to a compression spring (93); the top of the movable plate (92) is connected to an adjustment rod (910) that abuts against the bottom surface of a top plate (61) of an adjacent connecting block (6); When the adjacent connecting blocks (6) rotate, they abut against the adjusting rod (910) and open the first vent hole (95) to allow the inert gas to flow between the connecting blocks (6).

2. The automobile chassis welding device according to claim 1, characterized in that: A gap is left between the bottom surface of the sealing plate (91) and the workpiece (11).

3. The automobile chassis welding device according to claim 1, characterized in that: The frame (1) is connected to a turning assembly (3) for turning over a workpiece (11).

4. The automobile chassis welding device according to claim 3, characterized in that: The turnover assembly (3) comprises two connection frames (32), the two connection frames (32) being respectively arranged on one side of the frame (1), and the connection frames (32) being rotatably connected to the frame (1).

5. The automobile chassis welding device according to claim 4, characterized in that: The axial adjustment member (43) is provided with two groups and is respectively connected to one of the connection frames (32). The axial adjustment member (43) comprises a first screw rod (432) and a second screw rod (433) which are arranged with opposite threads. The bottom surface of the first screw rod (432) is connected to the top surface of the second screw rod (433). The first screw rod (432) rotates around its own axis. The two sides of the positioning plate (42) are fixedly connected to the two first screw rods (432). The positioning block (41) is provided with two and corresponds to the two second screw rods (433) one by one.

6. The automobile chassis welding device according to claim 1, characterized in that: The positioning plate (42) is provided with a plurality of through holes (421), the positioning plate (42) is provided with a positioning cover (422), the positioning cover (422) is arranged to cover the through hole (421), a pressure block (424) is slidably inserted between the inner wall of the positioning cover (422) and the inner wall of the through hole (421), and a pressure spring (423) is provided between the inner top surface of the positioning cover (422) and the top surface of the pressure block (424).

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