Automatic welding device for rear cover of light axle housing

Abstract

This invention relates to the field of automotive parts processing and discloses an automatic welding device for a rear cover of a lightweight vehicle axle housing. A first roller conveyor transports the axle housing body and rear cover, which have already been spot-welded together, until the axle housing body reaches the position on the support plate and the transport stops. Then, a lifting cylinder extends, causing a lifting plate, a rotating shaft, and the support plate to rise vertically along a sliding rod, lifting the axle housing body workpiece until the rear cover is tightly against the recessed area of ​​the fixing block. Next, a micro motor drives a second gear to rotate, which in turn drives a first gear, the rotating shaft, and the support plate to rotate, performing the welding work. This eliminates the need for a person to rotate around the axle housing body during welding. After the external welding is completed, the micro motor stops rotating, and the support plate returns to its original cross-shaped distribution. The lifting cylinder retracts, causing the support plate to return to its original position. At this point, the first roller conveyor is restarted to transport the workpiece to the flipping station. This invention has the advantages and benefits of automatic axle housing flipping, eliminating the need for manual rotating welding, and providing fast and efficient welding.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing technology, and in particular to an automatic welding device for a lightweight axle housing rear cover. Background Technology

[0002] The axle housing is the assembly base on a vehicle for mounting the main reducer, differential, half shafts, and wheels. It is an important component of the drive axle and one of the main components of the running gear. A typical non-disconnectable drive axle housing is a rigid hollow beam supported on the left and right drive wheels. The cavity in the middle of the axle housing is used to install various components. One side of the cavity has a mounting hole for users to assemble and inspect components, and the other side has a rear cover to close the cavity.

[0003] Because the axle housing needs to accommodate a variety of components, its shape is usually complex and varied. The axle housing and the rear cover are not suitable for integrated production. When producing the axle housing, welding is usually chosen to connect the axle housing and the rear cover. During welding, the outer part of the connection between the axle housing and the rear cover is first spot-welded, then the entire outer part is welded, and finally the inner part is welded. However, the existing technology generally involves hoisting the spot-welded workpiece to the respective outer and inner welding stations for fixation, and then manually rotating and welding it. This results in a large amount of manual labor, and the workpiece needs to be manually flipped and hoisted between the inner and outer welding stages, leading to low welding efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic welding device for the rear cover of a lightweight vehicle axle housing, which solves the above-mentioned technical problems and achieves the effects of automatic flipping of the axle housing, no need for manual welding, and fast and efficient welding.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an automatic welding device for a lightweight vehicle axle housing rear cover, comprising a bracket, a first roller conveyor mounted on the bracket, the first roller conveyor comprising a first conveying roller, a cross-shaped receiving space formed in the middle of a plurality of first conveying rollers, a cross-shaped bearing plate disposed in the receiving space, a lifting plate disposed below the first conveying roller, sliding rods fixedly disposed at the four right angles of the bottom of the lifting plate, a rotating shaft rotatably disposed in the middle, the rotating shaft being fixedly connected to the cross-shaped bearing plate, the bracket comprising a connecting plate, lifting cylinders symmetrically disposed in the middle of the connecting plate, the piston rod of the lifting cylinders being fixedly connected to the lifting plate, sliding rods being slidably connected to the connecting plate, a gear one fixedly disposed on the outer wall of the rotating shaft, a micro motor fixedly disposed on the lifting plate, a gear two fixedly disposed at the output end of the micro motor, the gear two meshing with the gear one;

[0006] The top pressing device includes a U-shaped frame located on both sides of the support, a crossbar connected between the U-shaped frames, a fixed block rotatably mounted on the crossbar, the bottom of the fixed block being concave and adapted to the bottom of the rear cover, and the piston rod of the lifting cylinder extending and abutting against the rear cover inside the fixed block.

[0007] The overturning device includes a worktable located at the tail of the first conveying device. The worktable has rotatable rings at its front and rear ends. An upper fixed plate is obliquely and symmetrically fixed between the inner walls of the two rings, and a lower fixed plate is horizontally fixed. A lower pressure cylinder is symmetrically fixed at the front and rear ends of the upper fixed plate. A movable plate is fixed at the end of the lower pressure cylinder. A second roller conveyor is mounted on the movable plate. The two second roller conveyors are symmetrically arranged in a V-shape. A straight triangular prism is symmetrically mounted on the side of the lower fixed plate near the second roller conveyor. The inclined surfaces of the two straight triangular prisms are arranged opposite each other to limit the bridge shell body. An internal welding device is provided at the rear of the overturning device.

[0008] The driving device includes a stepper motor, a gear three is fixedly provided at the output end of the stepper motor, and a rack is fixedly provided on the outer wall of the ring, with the gear and the rack meshing and connected.

[0009] By adopting the above technical solution, a first roller conveyor is set up to transport the bridge shell body and the rear cover that have been spot-welded together. The conveyor stops transporting the bridge shell body when it enters the position on the bearing plate. Then, the lifting cylinder extends and drives the lifting plate, the rotating shaft, and the bearing plate to rise vertically along the sliding rod, lifting the bridge shell body workpiece until the rear cover is tightly against the recessed part of the fixing block. Then, the micro motor drives the second gear to rotate, thereby driving the first gear, the rotating shaft, and the bearing plate to rotate for welding. There is no need for a person to rotate around the bridge shell body for welding, saving manpower and increasing welding efficiency. Since the rear cover abuts against the recessed part of the fixing block, it can also ensure that there is no weld seam at the weld, improving the welding quality. After the external welding is completed, the micro motor stops rotating and the bearing plate is returned to its original cross shape. The lifting cylinder retracts and drives the bearing plate back to its original position. At this time, the first roller conveyor is started to transport the workpiece to the flipping station.

[0010] Equipped with a flipping device, the first roller conveyor transports the workpiece to the lower fixed plate. Before flipping, the two inclined surfaces of the right triangular prism are opposite each other, ensuring the workpiece remains vertically in place and will not deviate. Even if there is a tendency to deviate, the inclined surfaces will block it and restore it to its original position. This eliminates the need for manual adjustment of the workpiece position, ensuring it remains centered on the lower fixed plate and preventing skewed transport, thus improving welding efficiency. The piston rod of the downward-pressing cylinder extends, driving the second roller conveyor downwards, confining and fixing the workpiece within the space between the right triangular prism and the second roller conveyor, achieving stable flipping. A stepper motor drives... The rotating ring rotates 180 degrees to flip the workpiece. The flipped workpiece is located on the second roller conveyor. Starting the second roller conveyor can stably continue to transport it forward to the inner welding station. This can realize the automatic flipping of the axle housing body after the outer welding is completed, further improving the overall welding efficiency. Since the parameters of the rear cover on the axle housing body of different car models are different, the extension and retraction of the cylinder piston rod can be adjusted after the flipping is completed to drive the axle housing body to move up and down. This makes it convenient for the second roller conveyor to smoothly transport the workpiece to the subsequent inner welding station. It can adapt to the flipping of rear covers of various axle housing models.

[0011] A further configuration of the present invention is as follows: the internal welding device includes a mounting plate, on which a column is provided, a U-shaped frame II is rotatably provided between the two columns, a steering motor is provided on the outside, the output end of the steering motor is fixedly connected to the U-shaped frame II, a bearing plate is fixedly provided in the middle of the U-shaped frame II, a rotating base is rotatably provided in the middle of the bearing plate, a rotating motor is fixedly provided at the bottom, the rotating motor is used to drive the rotating base to rotate, and a steering rod is provided on the rotating base, a rear cover receiving groove is provided in the middle of the steering rod, and clamping components are provided at both ends, an internal welding robotic arm is provided behind the column, and an internal welding welding head is provided at the tail end of the internal welding robotic arm.

[0012] By adopting the above technical solution, when the flipping is completed, the second U-shaped frame is in a vertical state. The drive motor drives the rotating base and the steering rod to rotate 90 degrees, so that the steering rod is located on the extension line of the second roller conveyor. At this time, the tower crane is used to assist in transferring the workpiece through the clamping components to the rotating rod until the rear cover is located in the rear cover receiving groove. The clamping components clamp the workpiece, the drive motor drives the steering rod to reset, and then the steering motor is adjusted to rotate the second U-shaped frame so that the opening of the rear cover of the workpiece is aligned with the inner welding head. The inner welding head is adjusted to enter the back cover for welding. Finally, the drive motor is started to rotate one revolution to complete the inner welding work, realizing the automation of the inner welding process and improving welding efficiency.

[0013] A further feature of the present invention is that the clamping assembly includes a bidirectional lead screw rotatably connected to the steering rod, the two ends of the bidirectional lead screw rotating in opposite directions and each being threadedly connected to a moving block, a clamping plate being fixedly provided on the top of the moving block, and the clamping plate being provided with an arc-shaped clamping groove for clamping the axle housing body.

[0014] By adopting the above technical solution, rotating the bidirectional lead screw drives the two moving blocks to move away from or towards each other. When they move away from each other, the main body of the bridge housing is released; when they move towards each other, the main body of the bridge housing is clamped in the arc-shaped clamping groove to limit the workpiece. This ensures the stability and safety of the rear cover relative to the inner welding head during internal welding, and facilitates the internal welding work.

[0015] A further feature of the present invention is that the height of the steering rod is equal to that of the roller of the second roller conveyor when the steering rod is laid flat.

[0016] By adopting the above technical solution, it is ensured that the workpiece can be stably conveyed onto the steering rod during the second roller conveyor.

[0017] A further feature of the present invention is that it also includes an external welding device, which includes an external welding robotic arm, and the tail end of the external welding robotic arm is provided with an external welding head.

[0018] By adopting the above technical solution, the external welding head is installed on the external welding robotic arm, realizing automated external welding and improving welding efficiency and accuracy.

[0019] A further configuration of the present invention is that the center lines of the two straight triangular prisms coincide with the center lines of the two second roller conveyors.

[0020] By adopting the above technical solution, the workpiece is stably fixed between the straight triangular prism and the second roller conveyor.

[0021] A further feature of the present invention is that the bearing plate includes a long vertical plate and a short horizontal plate, and limiting plates are symmetrically provided on both sides of the long vertical plate, with the limiting plates inclined outward and upward.

[0022] By adopting the above technical solution and setting the limiting plate at an angle, the workpiece will not deflect during vertical transport on the limiting plate. Even if there is a tendency to deflect, it will be blocked by the inclined surface at the top of the limiting plate and restored to its original position. The workpiece will always be on the long vertical plate of the bearing plate without manual adjustment and will not roll off. This makes it convenient for the subsequent lifting cylinder to lift the workpiece so that the back cover and the recessed part of the fixing block can abut together, further improving welding efficiency and ensuring welding safety.

[0023] A further feature of the present invention is that: four support columns are provided on the workbench, and a rotating wheel is fixedly provided on the top of the support columns, with the rotating wheel rotatably connected to the outer wall of the ring.

[0024] By adopting the above technical solution, rotational support for the ring can be achieved.

[0025] A further feature of the present invention is that the distance between the two rings is less than the length of the bridge housing body.

[0026] The beneficial effects of this invention are:

[0027] 1. This application uses a first roller conveyor to transport the bridge housing body and rear cover that have been spot-welded together. The conveyor stops transporting the bridge housing body when it enters the position on the bearing plate. Then, the lifting cylinder extends, driving the lifting plate, rotating shaft, and bearing plate to rise vertically along the sliding rod, lifting the bridge housing body workpiece until the rear cover is tightly against the recess of the fixing block. Then, the micro motor drives the second gear to rotate, thereby driving the first gear, rotating shaft, and bearing plate to rotate for welding. There is no need for a person to rotate around the bridge housing body for welding, saving manpower and increasing welding efficiency. Since the rear cover abuts against the recess of the fixing block, it can also ensure that there is no weld seam at the weld, improving welding quality. After the external welding is completed, the micro motor stops rotating, and the bearing plate is returned to its original cross shape. The lifting cylinder retracts, driving the bearing plate back to its original position. At this time, the first roller conveyor is started to transport the workpiece to the flipping station.

[0028] 2. This application incorporates a flipping device. The first roller conveyor transports the workpiece to the lower fixed plate. Before flipping, the two inclined surfaces of the straight triangular prism are opposite each other, ensuring that the workpiece is transported vertically without deviation. Even if there is a tendency to deviate, it will be blocked by the inclined surfaces and return to its original position. The workpiece can always be located in the middle of the lower fixed plate without manual adjustment, avoiding workpiece skew and improving welding efficiency. The piston rod of the downward-pressing cylinder extends, driving the second roller conveyor to move downward, limiting and fixing the workpiece within the limiting space between the straight triangular prism and the second roller conveyor, achieving stable flipping. The stepper motor drives the ring to rotate 180 degrees to achieve workpiece flipping. The flipped workpiece is located on the second roller conveyor. Starting the second roller conveyor can stably continue to transport it forward to the inner welding station, realizing automatic flipping of the bridge shell body after the outer welding is completed, further improving the overall welding efficiency.

[0029] 3. Since the parameters of the rear cover of the axle housing body are different for different car models, the extension and retraction of the cylinder piston rod can be adjusted after the flipping is completed to drive the axle housing body to move up and down, so that the second roller conveyor can smoothly transport the workpiece to the subsequent inner welding station. It can adapt to the flipping of the rear cover of various axle housing models. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0032] Figure 2 This is the present invention. Figure 1 A partial schematic diagram of AA in the middle.

[0033] Figure 3 This is a schematic diagram of the carrier plate of the present invention.

[0034] Figure 4 This is a schematic diagram of the carrier plate of the present invention from another angle.

[0035] Figure 5 This is a schematic diagram of the flipping device of the present invention after it has been flipped.

[0036] Figure 6 This is a schematic diagram of the flipping device of the present invention before flipping.

[0037] In the diagram, 1. Support; 100. Connecting plate; 2. First roller conveyor; 200. First conveying roller; 3. Bearing plate; 300. Long vertical plate; 301. Short horizontal plate; 302. Limiting plate; 4. Lifting plate; 5. Sliding rod; 6. Rotating shaft; 7. Lifting cylinder; 8. Gear one; 9. Micro motor; 900. Gear two; 10. Top pressing device; 1001. U-shaped frame one; 1002. Horizontal bar; 1003. Fixing block; 11. Tilting device; 1101. Workbench; 1102. Ring; 1103. Upper fixing plate; 1104. Lower fixing plate; 1105. Downward pressing cylinder; 1106. Moving plate; 1107. Second roller conveyor; 1108. Straight triangular prism; 1109. Support column; 1 110. Rotary wheel; 12. Internal welding device; 1201. Mounting plate; 1202. Column; 1203. U-shaped frame II; 1204. Steering motor; 1205. Bearing plate; 1206. Rotating base; 1207. Rotating motor; 1208. Steering rod; 1209. Rear cover receiving groove; 1210. Internal welding robotic arm; 1211. Internal welding head; 13. Drive device; 1301. Stepper motor; 1302. Gear III; 1303. Rack; 14. Clamping assembly; 1401. Two-way lead screw; 1402. Moving block; 1403. Clamping plate; 1404. Arc-shaped clamping groove; 15. External welding device; 1501. External welding robotic arm; 1502. External welding head; 16. Bridge housing body. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] An example is an automatic welding device for a lightweight axle housing rear cover, such as... Figures 1-6 As shown, the system includes a support 1, on which a first roller conveyor 2 is mounted. The first roller conveyor 2 includes a first conveying roller 200. A cross-shaped receiving space is formed in the middle of multiple first conveying rollers 200. A cross-shaped bearing plate 3 is provided in the receiving space. A lifting plate 4 is provided below the first conveying roller 200. Sliding rods 5 are fixed at the four right angles at the bottom of the lifting plate 4. A rotating shaft 6 is provided in the middle. The rotating shaft 6 is fixedly connected to the cross-shaped bearing plate 3. The support 1 includes a connecting plate 100. A lifting cylinder 7 is symmetrically provided in the middle of the connecting plate 100. The piston rod of the lifting cylinder 7 is fixedly connected to the lifting plate 4. The sliding rods 5 are slidably connected to the connecting plate 100. A gear 8 is fixedly mounted on the outer wall of the rotating shaft 6. A micro motor 9 is fixedly mounted on the lifting plate 4. A gear 900 is coaxially fixed at the output end of the micro motor 9. The gear 900 meshes with the gear 8.

[0040] The top pressing device 10 includes a U-shaped frame 1001 located on both sides of the bracket 1, a crossbar 1002 connected between the U-shaped frames 1001, and a fixed block 1003 rotatably mounted on the crossbar 1002. The bottom of the fixed block 1003 is concave and adapted to the bottom of the rear cover. When the piston rod of the lifting cylinder (7) extends, the rear cover abuts against the fixed block 1003.

[0041] The flipping device 11 includes a workbench 1101 located at the tail of the first conveying device. The workbench 1101 has two rotating rings 1102 at its front and rear ends. An upper fixed plate 1103 is obliquely and symmetrically fixed between the inner walls of the two rings 1102, and a lower fixed plate 1104 is horizontally fixed. A lower pressure cylinder 1105 is symmetrically fixed at the front and rear ends of the upper fixed plate 1103. A movable plate 1106 is fixed at the end of the lower pressure cylinder 1105. A second roller conveyor 1107 is mounted on the movable plate 1106. The two second roller conveyors are arranged symmetrically in a V-shape. A straight triangular prism 1108 is symmetrically mounted on the side of the lower fixed plate 1104 near the second roller conveyor 1107. The inclined surfaces of the two straight triangular prisms 1108 are arranged opposite each other to limit the bridge shell body 16. An inner welding device 12 is provided on the rear side of the flipping device 11.

[0042] The drive device 13 includes a stepper motor 1301, a gear 1302 fixedly mounted at the output end of the stepper motor 1301, and a rack 1303 fixedly mounted on the outer wall of the ring 1102, with the gear and rack 1303 meshing and connected.

[0043] The internal welding device 12 includes a mounting plate 1201, on which a column 1202 is provided. A U-shaped frame 1203 is rotatably provided between the two columns 1202. A steering motor 1204 is provided on the outside. The output end of the steering motor 1204 is fixedly connected to the U-shaped frame 1203. A bearing plate 1205 is fixedly provided in the middle of the U-shaped frame 1203. A rotating base 1206 is rotatably provided in the middle of the bearing plate 1205. A rotating motor 1207 is fixedly provided at the bottom. The rotating motor 1207 is used to drive the rotating base 1206 to rotate. A steering rod 1208 is provided on the rotating base 1206. A rear cover receiving groove 1209 is provided in the middle of the steering rod 1208. Clamping components 14 are provided at both ends. An internal welding robot arm 1210 is provided behind the column 1202. An internal welding welding head 1211 is provided at the tail end of the internal welding robot arm 1210.

[0044] The clamping assembly 14 includes a bidirectional lead screw 1401 rotatably connected to the steering rod 1208. The two ends of the bidirectional lead screw 1401 rotate in opposite directions and are threadedly connected to a moving block 1402. A clamping plate 1403 is fixedly provided on the top of the moving block 1402. The clamping plate 1403 is provided with an arc-shaped clamping groove 1404 for clamping the bridge housing body 16.

[0045] When the steering rod 1208 is laid flat, its height is equal to that of the roller of the second roller conveyor 1107.

[0046] The external welding device 15 includes an external welding robotic arm 1501, and the tail end of the external welding robotic arm 1501 is provided with an external welding head 1502.

[0047] The center lines of the two straight triangular prisms 1108 coincide with the center lines of the two second roller conveyors 1107.

[0048] The bearing plate 3 includes a long vertical plate 300 and a short horizontal plate 301. The long vertical plate 300 is symmetrically provided with limiting plates 302 on both sides, and the limiting plates 302 are inclined outward and upward.

[0049] Specifically, the workbench 1101 is provided with four support columns 1109, and a rotating wheel 1110 is fixed on the top of the support column 1109. The outer wall of the ring 1102 is rotatably connected to the rotating wheel 1110.

[0050] Specifically, the distance between the two rings 1102 is less than the length of the bridge shell body 16.

[0051] Its working principle is as follows: First, the external welding process: The first roller conveyor 2 is started to transport the bridge shell body 16 and the rear cover, which have been spot-welded together, so that the bridge shell body 16 enters the position on the bearing plate 3 and stops transporting. Due to the inclined setting of the limiting plate 302, the workpiece will not deflect vertically when transported on the limiting plate 302. Even if there is a tendency to deflect, it will be blocked by the inclined surface at the top of the limiting plate 302 and return to its original position. The workpiece will always be on the long vertical plate 300 of the bearing plate 3 without manual adjustment of the workpiece position and will not roll off. This makes it convenient for the subsequent lifting cylinder 7 to lift it up. When the rear cover and the fixed block 1003 are in contact, the lifting cylinder 7 is started to extend and drive the lifting plate 4, the rotating shaft 6, and the bearing plate 3. Plate 3 rises vertically along sliding rod 5, lifting the axle housing body 16 workpiece until the rear cover is tightly against the recess of fixing block 1003. Then, micro motor 9 drives gear 2 900 to rotate, thereby driving gear 1 8, rotating shaft 6, and bearing plate 3 to rotate for welding. External welding is performed using external welding head 1502 on external welding robotic arm 1501, eliminating the need for a person to rotate around the axle housing body 16 for welding, saving manpower and increasing welding efficiency. Since the rear cover abuts against the recess of fixing block 1003, it also ensures that there is no weld seam at the weld, improving welding quality. After external welding is completed, micro motor 9 stops rotating, and the bearing plate 3 returns to its original cross shape. Lifting cylinder 7 retracts, causing bearing plate 3 to return to its original position.

[0052] Secondly, the flipping process: The first roller conveyor 2 continues to transport the workpiece between the two inclined surfaces of the straight triangular prism 1108 on the lower fixed plate 1104, ensuring that the workpiece is transported horizontally and vertically without deflection. Even if there is a tendency to deflect, it will be blocked by the inclined surfaces and return to its original position. The workpiece position is always kept in the middle of the lower fixed plate 1104 without manual adjustment, preventing the workpiece from being transported crookedly. Then, the piston rod of the lower pressure cylinder 1105 extends, driving the second roller conveyor 1107 to move downward, limiting the workpiece within the straight triangular prism 1108. Within the limited space between the workpiece and the second roller conveyor 1107, the workpiece is fixed and achieves stable flipping. The stepper motor 1301 drives the ring 1102 to rotate 180 degrees to achieve workpiece flipping. The flipped workpiece is located on the second roller conveyor 1107. The extension and retraction of the cylinder piston rod is adjusted to drive the bridge housing body 16 to move up and down until the bottom of the workpiece on the second roller conveyor 1107 is level with the bottom of the horizontal steering rod 1208. The second roller conveyor 1107 is started and the workpiece is transferred to the inner welding station with the help of the tower crane.

[0053] Finally, the internal welding process: After the flipping is complete, the U-shaped frame 1203 is in a vertical position. The drive motor 1207 rotates the rotating base 1206 and the steering rod 1208 by 90 degrees, so that the steering rod 1208 is located on the extension line of the second roller conveyor 1107. At this time, the tower crane is used to assist in transferring the workpiece through the clamping assembly 14 to the rotating rod until the rear cover is located in the rear cover receiving groove 1209. The bidirectional lead screw 1401 is rotated to drive the two moving blocks 1402 to move closer to each other, clamping the bridge housing body 16. The workpiece is limited within the arc-shaped clamping groove 1404 to ensure the stability and safety of the rear cover relative to the inner welding head during internal welding, facilitating the internal welding work. The rotating motor 1207 drives the steering rod 1208 to reset, and then the steering motor 1204 is adjusted to rotate the U-shaped frame 1203 so that the opening of the rear cover of the workpiece is aligned with the inner welding head. The inner welding head is then adjusted to enter the interior of the rear cover for welding. Finally, the rotating motor 1207 is started to rotate one revolution to complete the internal welding work, realizing the automation of the internal welding process and improving welding efficiency.

Claims

1. An automatic welding device for a light vehicle axle housing rear cover, characterized in that: The system includes a support frame (1), on which a first roller conveyor (2) is mounted. The first roller conveyor (2) includes a first conveying roller (200). A cross-shaped receiving space is formed in the middle of a plurality of first conveying rollers (200). A cross-shaped bearing plate (3) is provided in the receiving space. A lifting plate (4) is provided below the first conveying rollers (200). A sliding rod (5) is fixed at the four right angles at the bottom of the lifting plate (4), and a rotating shaft (6) is rotatably provided in the middle. The rotating shaft (6) is fixedly connected to the cross-shaped bearing plate. The bracket (1) includes a connecting plate (100), and a lifting cylinder (7) is symmetrically provided in the middle of the upper part of the connecting plate (100). The piston rod of the lifting cylinder (7) is fixedly connected to the lifting plate (4). The sliding rod (5) is slidably connected to the connecting plate (100). The outer wall of the rotating shaft (6) is fixedly provided with a gear one (8). The lifting plate (4) is fixedly provided with a micro motor (9). The output end of the micro motor (9) is fixedly provided with a gear two (900). The gear two (900) meshes with the gear one (8). The top pressing device (10) includes a U-shaped frame (1001) located on both sides of the bracket (1), a crossbar (1002) is connected between the U-shaped frames (1001), a fixed block (1003) is rotatably provided on the crossbar (1002), the bottom of the fixed block (1003) is concave and adapted to the bottom of the rear cover, and the piston rod of the lifting cylinder (7) extends to press the rear cover against the fixed block (1003); The flipping device (11) includes a worktable (1101) located at the tail of the first conveying device. The worktable (1101) has rotatable rings (1102) at both its front and rear ends. An upper fixing plate (1103) is obliquely and symmetrically fixed between the inner walls of the two rings (1102), and a lower fixing plate (1104) is horizontally fixed. A lowering cylinder (1105) is symmetrically fixed at both the front and rear ends of the upper fixing plate (1103). A movable plate is fixed at the end of the lowering cylinder (1105). 1106), the movable plate (1106) is provided with a second roller conveyor (1107), the two second roller conveyors (1107) are arranged symmetrically in a V shape, the lower fixed plate (1104) is symmetrically provided with straight triangular prisms (1108) on the side close to the second roller conveyor (1107), the slope surfaces of the two straight triangular prisms (1108) are arranged opposite each other to limit the bridge shell body (16), and the rear side of the flipping device (11) is provided with an inner welding device (12); The driving device (13) includes a stepper motor (1301), a gear three (1302) is fixedly provided at the output end of the stepper motor (1301), and a rack (1303) is fixedly provided on the outer wall of the ring (1102), and the gear three (1302) and the rack (1303) are meshed and connected. The internal welding device (12) includes a mounting plate (1201), on which columns (1202) are provided. A U-shaped frame (1203) is rotatably provided between the two columns (1202), and a steering motor (1204) is provided on the outside. The output end of the steering motor (1204) is fixedly connected to the U-shaped frame. A bearing plate (1205) is fixedly provided in the middle of the U-shaped frame (1203), and a rotating base (1205) is rotatably provided in the middle of the bearing plate (1205). 6) A rotating motor (1207) is fixed at the bottom. The rotating motor (1207) is used to drive the rotating base (1206) to rotate. A steering rod (1208) is provided on the rotating base (1206). A rear cover receiving groove (1209) is provided in the middle of the steering rod (1208), and clamping components (14) are provided at both ends. An internal welding robotic arm (1210) is provided behind the column (1202). An internal welding welding head (1211) is provided at the tail end of the internal welding robotic arm (1210). The clamping assembly (14) includes a bidirectional lead screw (1401) rotatably connected to the steering rod (1208). The two ends of the bidirectional lead screw (1401) rotate in opposite directions and are threadedly connected to a moving block (1402). A clamping plate (1403) is fixedly provided on the top of the moving block (1402). The clamping plate (1403) is provided with an arc-shaped clamping groove (1404) for clamping the bridge housing body (16).

2. The automatic welding device for the rear cover of a light vehicle axle housing according to claim 1, characterized in that: When the steering rod (1208) is laid flat, it is at the same height as the roller of the second roller conveyor (1107).

3. The automatic welding device for the rear cover of a light vehicle axle housing according to claim 1, characterized in that: It also includes an external welding device (15), which includes an external welding robotic arm (1501) and an external welding head (1502) at the tail end of the external welding robotic arm (1501).

4. The automatic welding device for the rear cover of a light vehicle axle housing according to claim 1, characterized in that: The center lines of the two straight triangular prisms (1108) coincide with the center lines of the two second roller conveyors (1107).

5. The automatic welding device for the rear cover of a light truck axle housing according to claim 1, characterized in that: The bearing plate (3) includes a long vertical plate (300) and a short horizontal plate (301). The long vertical plate (300) is symmetrically provided with limiting plates (302) on both sides. The limiting plates (302) are inclined outward and upward.

6. The automatic welding device for a lightweight vehicle axle housing rear cover according to claim 1, characterized in that: The workbench (1101) is provided with four support columns (1109), and a rotating wheel (1110) is fixedly provided on the top of the support column (1109). The outer wall of the ring (1102) is rotatably connected to the rotating wheel (1110).

7. The automatic welding device for a lightweight vehicle axle housing rear cover according to claim 1, characterized in that: The distance between the two rings (1102) is less than the length of the bridge housing body (16).

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