An automobile rear axle welding device

Abstract

The present invention belongs to the technical field of automobile axle welding, and discloses an automobile rear axle welding device, which includes a frame and a welding torch. It also includes a driving assembly arranged on the frame. The driving assembly includes a driven gear detachably arranged on a shaft sleeve; a driving gear meshing with the driven gear; and a motor, the output shaft of which is coaxially connected to the driving gear. It further includes a limiting assembly arranged on the frame. The limiting assembly includes two symmetrically arranged limiting rollers in rolling contact with the shaft sleeve. The limiting assembly also includes a guide rail and fixing bolts. The guide rail is arranged on the frame, and the limiting rollers are slidably arranged on the guide rail through the fixing bolts. It also includes a cooling assembly arranged on the frame. The cooling assembly includes a nozzle and a cold source tank, the cold source tank is communicated with the nozzle, and the air outlet end of the nozzle faces the bottom of the shaft sleeve. The present invention solves the problem in the prior art that the rear axle cannot be rotationally clamped and welded.

Description

Technical Field

[0001] This solution belongs to the technical field of automobile axle welding, and specifically relates to a welding device for an automobile rear axle. Background Technique

[0002] Referring to the paper "Design and Research of a Special Machine for Circular Seam Welding of the Three-section Automobile Rear Axle", the three-section automobile rear axle is an important part of the automobile running system, and its quality is related to the performance and driving safety of the vehicle. With the continuous improvement of automobile production technology, the production of the three-section automobile rear axle needs to continuously improve production efficiency while ensuring quality. In the production of the rear axle, the welding of the axle housing and the half shaft sleeve is relatively important, which involves the welding of the three-section automobile rear axle. And the three-section automobile rear axle will break under extreme use conditions. For example, stresses such as impact, vibration, and bending moment during vehicle driving will cause fatigue accumulation of materials and eventually break. The broken rear axle can be repaired by welding and continue to be used.

[0003] See the attached Figure 1 According to the prior art, when welding the three-section automobile rear axle, it needs to be clamped and fixed to ensure the alignment and stable positioning between the axle housing and the half shaft sleeve, prevent weld deviation or welding defects caused by any displacement or vibration, so as to ensure the welding quality and the structural strength of the rear axle; at the same time, clamping and fixing can also reduce welding deformation and ensure that the welded rear axle meets strict dimensional accuracy requirements. The existing rear axle clamping device clamps and fixes the shaft sleeve, and welds the annular welding position by moving the position of the welding head. For example, referring to the document with the existing publication (announcement) number CN117206738A, a welding device for an automobile axle is disclosed, including a workbench; a welding head, the welding head is arranged above the workbench, and the welding head is connected to an external controller, and the welding head can be driven to move on the X, Y, and Z axes through the external controller; a placement plate, the placement plate is fixedly connected above the workbench, and the placement plate is used to place the automobile axle; a support frame, the support frame is arranged above the workbench.

[0004] The above welding device places the automobile axle to be welded on the placement plate, and then installs the middle axle of the automobile on the axle through the assembly mechanism inside the support frame. Subsequently, the welding head is controlled to move on the X, Y, and Z axes, so that the welding head performs welding treatment on the connection between the middle axle of the automobile and the axle. Although the welding position can be circularly welded by the movement of the welding head, the cost of this multi-axis drive system is relatively high. It requires precise control systems and drive mechanisms to ensure the precise movement of the welding head. Secondly, the position of the shaft sleeve and the axle housing is a circumferential seam, and only needs to be welded full. However, the movement of the welding head in three axial directions will increase the complexity during the welding process. Moreover, when manually repairing the broken rear axle, it is necessary to hold a welding torch to weld the seam at the welding position. After the upper half of the gap is welded full, since the rear axle is clamped and fixed and the lower half of the welding position is blocked by the machine frame, etc., at this time, it is necessary to loosen the clamping of the rear axle and then rotate the rear axle half a circle to weld the lower half, which reduces the welding efficiency and increases the labor intensity of the workers. Summary of the Invention

[0005] The purpose of this solution is to provide an automobile rear axle welding device to solve the problem in the prior art that the rear axle cannot be rotationally clamped and welded.

[0006] To achieve the above purpose, this solution provides an automobile rear axle welding device, including a machine frame and a welding torch, and further includes a driving component arranged on the machine frame. The driving component includes:

[0007] A driven gear, which is detachably arranged on the shaft sleeve;

[0008] A driving gear, which meshes with the driven gear;

[0009] A motor, the output shaft of which is coaxially connected to the driving gear.

[0010] The principle of this solution is as follows: (1) First, the driven gear is inserted and fixed on the shaft sleeve. If the welding torch is fixedly arranged on the machine frame, after the welding torch welds this point position, the driving gear is rotated by the motor, so that the driven gear drives the shaft sleeve to rotate, and then drives the whole rear axle to rotate, so that the next welding point moves to the welding head of the welding torch. (2) If the welding torch is held manually, after welding the upper half of the circular welding position, the motor is started to drive the driving gear to rotate, so that the lower half is transferred to the upper part, and then the lower half is welded.

[0011] The effects of this solution are as follows: (1) By driving the drive roller to drive the shaft sleeve to rotate, the rear axle can rotate during the welding process, so that the welding head does not need complex multi-axis movement when welding the annular gap, simplifies the control system of the welding head, and reduces the equipment cost. (2) During manual welding, the rear axle can rotate during the welding process, eliminating the need for manual rotation of the rear axle, reducing the labor intensity of manual operation, shortening the welding time, and improving production efficiency. At the same time, it also avoids welding position deviation caused by manual rotation. (3) The welding device of this solution is applicable not only to automatic welding with a fixed welding torch but also to semi-automatic welding with a manually held welding torch, with high flexibility.

[0012] Furthermore, it also includes a limit component arranged on the frame. The limit component includes two symmetrically arranged limit rollers that are in rolling contact with the shaft sleeve; the limit component also includes a guide rail and a fixing bolt. The guide rail is arranged on the frame, and the limit roller is slidably arranged on the guide rail through the fixing bolt.

[0013] The principle and effects of this solution are as follows: (1) By means of two symmetric limit rollers, the two sides of the shaft sleeve are clamped to prevent the rear axle from moving during the welding process, thus ensuring the welding quality. (2) Due to different usage conditions of different vehicle models, the diameters of the rear axle shaft sleeves are different. In this solution, the position of the limit roller on the guide rail is adjusted according to the diameter of the shaft sleeve and locked with a fixing bolt, so as to adapt to rear axle shaft sleeves of different sizes, without the need to separately design and manufacture special welding equipment for each shaft sleeve diameter.

[0014] Furthermore, it also includes a cooling component arranged on the frame. The cooling component includes a nozzle and a cold source tank. The cold source tank is communicated with the nozzle, and the air outlet end of the nozzle faces the bottom of the shaft sleeve.

[0015] The principle and effects of this solution are as follows: During the welding process of the automotive rear axle, due to the action of high temperature, the metal material of the rear axle will expand rapidly. Without proper cooling, this process of thermal expansion and contraction will cause thermal stress and welding deformation in the welding area, and the welding deformation will affect the assembly quality of the rear axle shaft sleeve and the axle housing. In this solution, a cold source tank and a nozzle are used to cool down the deposited metal after welding, such as using nitrogen or argon, so as to reduce deformation and stress concentration.

[0016] Furthermore, the cooling assembly further includes an incomplete gear, a first rack, and a second rack; the incomplete gear is fixedly connected to the output shaft of the motor, the first rack and the second rack are arranged alternately, and the incomplete gear is arranged in cooperation with the first rack and the second rack; it further includes a first cylinder and a second cylinder with the same structure, the first rack is connected to the piston rod of the first cylinder, the second rack is connected to the piston rod of the second cylinder, the air outlets of the first cylinder and the second cylinder are communicated with the intake end of the nozzle through pipelines, the air inlets of the first cylinder and the second cylinder are communicated with the cold source tank through pipelines, the pistons of the first cylinder and the second cylinder are connected with compression springs, and the free ends of the compression springs are fixedly connected to the cylinder block.

[0017] The principle and effect of this solution are as follows: (1) The cold source in the cold source tank is replenished into the cylinder bodies of the first cylinder and the second cylinder through the air inlets. When the motor drives the incomplete gear to rotate, the incomplete gear intermittently drives the first rack and the second rack to move, thereby driving the piston rods of the cylinders to extend, so that the pistons in the cylinder bodies squeeze the cold source in the cylinder bodies, and the cold source is sprayed out from the nozzle through the air outlets. Since the output shaft of the motor rotates, it will also drive the shaft sleeve to rotate, so that the already welded area (upper half circle) rotates to the lower half circle. At this time, the nozzle sprays the cold source onto the already welded area to cool it down. (2) In the prior art, the welding area is cooled after welding is completed, which makes the welding area stay at a high temperature for a long time, easily causing problems such as grain coarsening and stress concentration in the heat affected zone (HAZ) of the welding part, thus affecting the welding quality and increasing the risk of welding deformation. In this solution, the rear axle is rotated during welding to cool the welding area, thereby controlling the temperature of the welding area, reducing the adverse effects of the heat affected zone, and reducing welding deformation. (3) In this solution, when all the annular welding positions are welded, the motor speed can also be increased to drive the rear axle to rotate quickly, so as to quickly cool the entire welding area.

[0018] Furthermore, the piston rods of the first cylinder and the second cylinder extend in opposite directions, the air inlets and air outlets of the first cylinder and the second cylinder are both arranged on the rear end covers of the cylinder bodies, and the first rack is connected to the piston rod of the first cylinder through a bracket.

[0019] The principle and effect of this solution are as follows: (1) When the motor drives the rear axle to rotate, it will inevitably cause the incomplete gear to rotate, which will cause one of the racks to move, and then cause the piston rod of the cylinder connected to the rack to move, so that the piston squeezes the cold source inside. At this time, the welded area in the upper half circle has not completely rotated to the lower half circle. Therefore, waste of the cold source will occur during the process of the welded area in the upper half circle rotating to the lower half circle. (2) In this solution, since the air inlets and outlets of the first cylinder and the second cylinder are both arranged on the rear end cover, that is, the piston is arranged in front of the air inlets and outlets, there will be no space between the rear end of the piston and the cylinder block. As a result, the cylinder blocks of the first cylinder and the second cylinder in the initial state will not be filled with the cold source. After the piston rod of the first cylinder or the second cylinder extends, space is generated in the cylinder block, and the cold source in the cold source tank enters the cylinder block through the air inlet. At the same time, when the incomplete gear rotates to disengage from one of the racks, the piston and the piston rod reset under the drive of the compression spring, so that the piston squeezes the cold source in the cylinder block, and the cold source passes through the air outlet into the nozzle. At this time, the welded area in the upper half circle has rotated to the lower half circle, and the cold source sprayed by the nozzle just sprays onto the welded area, thus avoiding waste of the cold source.

[0020] Further, two sliding grooves are symmetrically arranged on the frame, and the first rack and the second rack are respectively slidably arranged in the sliding grooves.

[0021] The principle and effect of this solution are as follows: This is the prior art. The sliding grooves play a role in positioning and guiding the movement of the first rack and the second rack, avoiding dislocation.

[0022] Further, it further includes a detection component. The detection component includes a slide rail and a slider. The slide rail is fixedly arranged on the frame, the slider is slidably arranged on the slide rail, the second rack is arranged in cooperation with the slider, a groove is formed in the slider, a movable plate is slidably arranged in the groove, a reverse switch is arranged on the slider, the reverse switch is electrically connected to the motor through a controller, a spring is connected to the movable plate, the free end of the spring is connected to the groove, the movable plate faces the air outlet end of the nozzle, and the movable plate is used to touch the reverse switch.

[0023] The principle and effect of this scheme are as follows: (1) During welding, it is necessary to detect whether the welding area is fully welded. If the welding area is not fully welded, it will directly affect the stability of the welded joint, resulting in gaps or cracks in the welded area. In the prior art, the welding area is inspected after welding. If problems are found, rework and correction are required, which not only adds extra time and cost, but also affects the welding quality and structure due to repeated repairs. Therefore, it is necessary to monitor in real time whether the welding area is not fully welded during the welding process, and to perform repair welding immediately. (2) In this scheme, when the incomplete gear rotates to mesh with the second rack, the second rack will push the slider to move to the maximum stroke on the slide rail, and after the welding area rotates to the lower half of the circle, the nozzle will spray gas to the welding area. If the welding area is fully welded, the gas sprayed from the nozzle will be partially blocked by the weld layer, and the movable plate will not be pushed by the gas due to the action of the spring, thereby resisting the reversing switch. If the welding area is not fully welded, part of the gas ejected from the nozzle will not be unobstructed, that is, the gas flow rate blowing to the movable plate is larger, thereby overcoming the effect of the spring to push the movable plate to make it resist the reversal switch. When the reversal switch is resisted and the internal contact is turned on, it indicates that the welding area at that location is not fully welded. Then the controller controls the motor to reverse, thereby driving the welding area to reset to the initial welding position, and the welding gun performs re-welding on that position. At the same time, the movable plate is reset under the drive of the spring, and the reversal switch contacts are disconnected after losing the resistance. (3) This solution can immediately detect and deal with the situation of incomplete welding by real-time monitoring whether the welding area is fully welded during the welding process, avoiding the situation where the problem is discovered after the welding is completed and rework is required. Compared with the prior art that performs detection after the welding is completed, this solution can reverse the motor to the welding gun area for re-welding when the welding area is not fully welded through the cooperation of the movable plate and the reversal switch, thereby saving the time and cost required for rework and improving welding quality and production efficiency.

[0024] Furthermore, the inner wall of the slide rail contacts the outer wall of the slide block.

[0025] The principle and effect of this solution are as follows: since the inner wall of the slide rail contacts the outer wall of the slider, when the second rack pushes the slider to move to the maximum stroke in the slide rail, the slider is clamped in the slide rail to prevent the slider from falling and resetting.

[0026] Furthermore, it also includes an air suction component arranged on the frame, the air suction component includes a cam and a push-type air suction pump, the cam is coaxially fixedly connected to the output shaft of the motor, the cam and the push-type air suction pump are arranged in coordination, the push-type air suction pump is connected to a suction nozzle through a pipeline, and the suction nozzle is arranged on one side of the welding gun.

[0027] The principle and effect of this solution are as follows: (1) During welding, the welding material and the base material melt at high temperature and undergo chemical reactions, causing chemical reactions among the metal vapor, coating material in the weld area, and oxygen, nitrogen, etc. in the surrounding air, generating a series of harmful gases and particulate matters. These toxic gases have health impacts when inhaled by welders, so it is necessary to suck away the poisonous gases during welding. (2) In this solution, while the motor drives the rear axle to rotate during welding, the cam rotates and collides with the pressing air pump, thereby sucking away the poisonous gases and particulate matters in the welding area to reduce the content of poisonous gases in the welding area.

[0028] Furthermore, it further includes a grinding wheel, the grinding wheel is coaxially and fixedly connected to the output shaft of the motor, and the grinding wheel is arranged in cooperation with the nozzle.

[0029] The principle and effect of this solution are as follows: (1) During the welding process, defects such as uneven welds and welding slag will be generated, so it is necessary to perform grinding after cooling to make the weld area smooth. In this solution, the motor rotates rapidly, thereby driving the grinding wheel to rotate, and then grinding the welding area, and grinding the originally thicker welding area to be the same as the outer diameter of the shaft sleeve. (2) During grinding, the nozzle sprays air towards the grinding area to blow away the welding slag on the welding area.

[0030] Furthermore, it further includes a painting assembly arranged on the frame. The painting assembly includes a paint spray gun and a pressing air pump. The pressing air pump is arranged in cooperation with the cam. The air outlet end of the pressing air pump is communicated with the air inlet end of the paint spray gun through a pipeline, and the nozzle of the paint spray gun faces the welding position.

[0031] The principle and effect of this solution are as follows: After grinding, it is necessary to paint the welding area to prevent the welding area from being corroded. In this solution, the motor drives the cam to rotate, making the cam intermittently collide with the pressing air pump, thereby providing power for the paint spray gun to paint and maintain the welding position. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of the prior art;

[0033] Figure 2 is a schematic structural diagram of a welding device for an automotive rear axle according to the present invention;

[0034] Figure 3 is a schematic structural diagram of the cooling component of the present invention;

[0035] Figure 4 is a schematic structural diagram of the detection component and the nozzle of the present invention Figure 1 ;

[0036] Figure 5 is a schematic structural diagram of the detection component and the nozzle of the present invention Figure 2 ;

[0037] Figure 6 It is a schematic structural diagram of the air intake component of the present invention;

[0038] Figure 7 It is a schematic structural diagram of the grinding wheel of the present invention;

[0039] Figure 8 It is a schematic structural diagram of the paint spraying component of the present invention.

[0040] The reference numerals in the accompanying drawings of the specification include: welding torch 1, driving component 2, motor 21, limiting component 3, limiting roller 31, guide rail 32, cooling component 4, nozzle 41, incomplete gear 42, first rack 43, second rack 44, first cylinder 45, second cylinder 46, air outlet 47, air inlet 48, piston 49, compression spring 410, bracket 411, detection component 5, slide rail 51, slider 52, movable plate 53, reverse switch 54, spring 55, air intake component 6, cam 61, push-button air suction pump 62, suction nozzle 63, grinding wheel 7, paint spraying component 8, paint spraying gun 81, shaft sleeve 9, axle housing 10, welding area 11. Specific embodiments

[0041] The following will clearly and completely describe the concept and technical effects generated by the present invention in combination with the embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present invention:

[0042] Embodiment:

[0043] Please refer to Figure 2 , an automobile rear axle welding device, including a frame (not shown in the figure) and a welding torch 1. The welding torch 1 uses a welding torch 1 that can automatically replenish welding wire. A driving component 2 is provided on the frame. The driving component 2 includes a driving gear and a driven gear (not shown in the figure). The driving gear meshes with the driven gear. The driving gear is connected with a motor 21. The output end of the motor 21 is connected with a speed reducer, and the output end of the speed reducer is coaxially and fixedly connected with the driving gear. The driven gear is a detachable driven gear. During welding, the driven gear is passed through and fixed on the shaft sleeve 9, and then the rear axle housing 10 is placed in the card slot through the limiting card slot and the housing 10 can rotate in the card slot. Then, the motor 21 is started, and the driving gear is driven to rotate by the motor 21, so that the driven gear drives the shaft sleeve 9 to rotate, and then drives the whole rear axle to rotate. If the welding torch 1 is manually held, after welding the upper half of the annular welding position, the motor 21 is started to drive the driving gear to rotate, so that the lower half is transferred to the upper part, and then the lower half is welded, so that the rear axle can rotate during the welding process without manual rotation of the rear axle.

[0044] To prevent the rear axle from moving during the welding process and thus ensure the welding quality, a limiting component 3 is also provided on the frame. The limiting component 3 includes two symmetrically arranged limiting rollers 31, and the limiting rollers 31 are in rolling contact with the shaft sleeve 9. Through the two symmetric limiting rollers 31, both sides of the shaft sleeve 9 are clamped to prevent the rear axle from moving during the welding process. Since the diameters of the rear axle shaft sleeves of different vehicle models are different, it is necessary to adapt to rear axle shaft sleeves 9 of different sizes. The limiting component 3 further includes a guide rail 32 and fixing bolts. The guide rail 32 is provided on the frame, and the limiting rollers 31 are slidably arranged on the guide rail 32 through the fixing bolts. By correspondingly adjusting the position of the limiting rollers 31 on the guide rail 32 according to the diameter of the shaft sleeve 9 and locking with the fixing bolts, different-sized rear axle shaft sleeves 9 can be adapted.

[0045] Please refer to Figure 2 and Figure 3 During the welding process of the automotive rear axle, due to the action of high temperature, the metal material of the rear axle will expand rapidly. Without proper cooling, this process of thermal expansion and contraction will cause thermal stress and welding deformation in the welding area, and the welding deformation will affect the assembly quality of the rear axle shaft sleeve 9 and the axle housing 10. A cooling component 4 is also provided on the frame. The cooling component 4 includes a nozzle 41 and a cold source tank (not shown in the figure). The cold source tank is communicated with the nozzle 41, and nitrogen is provided in the cold source tank. The air outlet end of the nozzle 41 faces the bottom of the shaft sleeve 9. The cooling component 4 further includes an incomplete gear 42, a first rack 43, and a second rack 44. The incomplete gear 42 is fixedly connected to the output shaft of the reducer connected to the motor 21. The first rack 43 and the second rack 44 are arranged vertically and staggered. The incomplete gear 42 is arranged in cooperation with the first rack 43 and the second rack 44, so that the incomplete gear 42 intermittently meshes with the first rack 43 and the second rack 44. The cooling component 4 further includes a first cylinder 45 and a second cylinder 46 with the same structure. The first rack 43 is connected to the piston rod of the first cylinder 45, and the second rack 44 is connected to the piston rod of the second cylinder 46. The air outlet 47 of the first cylinder 45 and the second cylinder 46 is communicated with the air inlet end of the nozzle 41 through a pipeline, and the air inlet 48 of the first cylinder 45 and the second cylinder 46 is communicated with the cold source tank through a pipeline. A compression spring 410 is connected to the piston 49 of the first cylinder 45 and the second cylinder 46, and the free end of the compression spring 410 is fixedly connected to the cylinder block.

[0046] The specific working conditions are as follows: Nitrogen in the cold source tank is supplemented into the cylinders of the first cylinder 45 and the second cylinder 46 through the air inlet 48. When the motor 21 drives the incomplete gear 42 to rotate, the incomplete gear 42 intermittently drives the first rack 43 and the second rack 44 to move up and down alternately, thereby driving the piston rod of the first cylinder 45 or the second cylinder 46 to extend, so that the piston 49 in the cylinder squeezes the nitrogen in the cylinder, and the nitrogen is sprayed out from the nozzle 41 through the air outlet 47. And when the output shaft of the motor 21 rotates, it will also drive the shaft sleeve 9 to rotate, so that the already welded area (upper half circle) rotates to the lower half circle. At this time, the cold source sprayed from the nozzle 41 cools the already welded area. In this embodiment, the rear axle is rotated during the welding process to cool the welding area, thereby controlling the temperature of the welding area, reducing the adverse effects of the heat affected zone, and reducing welding deformation. And after all the circumferential welding positions are welded, the rotation speed of the motor 21 can be increased to drive the rear axle to rotate quickly, so as to quickly cool the entire welding area.

[0047] Since the motor 21 drives the rear axle to rotate, it will inevitably cause the incomplete gear 42 to rotate, which will cause one of the racks to move, and then cause the piston rod of the cylinder connected to the rack to move, so that the piston 49 squeezes the nitrogen inside. At this time, the already welded area of the upper half circle has not completely rotated to the lower half circle. Therefore, nitrogen will be wasted during the process of the upper half circle welding area rotating to the lower half circle. By setting the extending directions of the piston rods of the first cylinder 45 and the second cylinder 46 to be opposite, that is, the piston rod of the first cylinder 45 extends downward, the piston rod of the second cylinder 46 extends upward, and the air inlets 48 and air outlets 47 of the first cylinder 45 and the second cylinder 46 are both arranged on the rear end cover of the cylinder, and the first rack 43 is connected to the piston rod of the first cylinder 45 through the bracket 411. Through the above settings, since the air inlets 48 and air outlets 47 of the first cylinder 45 and the second cylinder 46 are both arranged on the rear end cover, that is, the piston 49 is arranged in front of the air inlet 48 and the air outlet 47, there will be no space between the rear end of the piston 49 and the cylinder body. Therefore, the cylinders of the first cylinder 45 and the second cylinder 46 in the initial state will not be filled with nitrogen. After the piston rod of the first cylinder 45 or the second cylinder 46 extends, a space is generated in the cylinder, so that the nitrogen in the cold source tank enters the cylinder through the air inlet 48. At the same time, when the incomplete gear 42 rotates to disengage from one of the racks, the piston 49 and the piston rod are reset under the drive of the compression spring 410, so that the piston 49 squeezes the nitrogen in the cylinder, and the nitrogen is introduced into the nozzle 41 through the air outlet 47. At this time, the welding area of the upper half circle has rotated to the lower half circle, and the nitrogen sprayed from the nozzle 41 just sprays onto the welding area, thus avoiding the waste of nitrogen.

[0048] During welding, it is necessary to detect whether the welding area is penetrated. If the welding area is not penetrated, it will directly affect the stability of the welded joint, resulting in gaps or cracks in the welded part. In the prior art, the welding area is detected after welding. If problems are found, rework and correction are required, which not only increases additional time and cost, but also affects the welding quality and structure due to repeated repairs. Therefore, it is necessary to monitor in real time during welding whether the welding area is not penetrated and perform repair welding immediately. Please refer to Figure 4 and Figure 5 , it further includes a detection component 5. The detection component 5 includes a slide rail 51 and a slider 52. The slide rail 51 is fixedly arranged on the frame. The second rack 44 is arranged in cooperation with the slider 52. The slider 52 is slidably arranged on the slide rail 51, and the inner wall of the slide rail 51 abuts against the outer wall of the slider 52, so that the slider 52 can be clamped in the slide rail 51 to prevent the slider 52 from falling and resetting. However, the clamping force between the slider 52 and the slide rail 51 is less than the thrust of the second rack 44 on the slider 52, so that the second rack 44 can push the slider 52 to move to the maximum stroke of the slide rail 51 and clamp the slider 52 at the limit position. A groove 521 is formed in the slider 52, and a movable plate 53 is slidably arranged in the groove 521. A reverse switch 54 is arranged on the slider 52. The reverse switch 54 is electrically connected to the motor 21 through a controller. The movable plate 53 is connected with a spring 55, and the free end of the spring 55 is connected with the groove 521. The movable plate 53 faces the air outlet end of the nozzle 41, and the movable plate 53 is used to touch the reverse switch 54.

[0049] The specific working conditions are as follows: Please refer to Figure 4 , when the incomplete gear 42 rotates to mesh with the second rack 44, the second rack 44 will push the slider 52 to move to the maximum stroke on the slide rail 51. After the welding area rotates to the lower half circle, the nozzle 41 sprays gas to the welding area. If the welding area is full, part of the gas sprayed by the nozzle 41 will be blocked by the weld layer, and the movable plate 53 will not be pushed by the gas due to the action of the spring 55 and thus will not touch the reverse switch 54. Please refer to Figure 5 , if the welding area is not full, part of the gas sprayed by the nozzle 41 will not be blocked, that is, the gas flow blowing towards the movable plate 53 is greater, so as to overcome the action of the spring 55 and push the movable plate 53 to touch the reverse switch 54. When the reverse switch 54 is touched and the internal contacts are connected, it indicates that the welding area at this place is not full. Then, the controller controls the motor 21 to reverse, so as to drive the welding area to reset to the initial welding position, and the welding torch 1 performs repair welding on this position. At the same time, the movable plate 53 resets under the drive of the spring 55, and the contacts of the reverse switch 54 disconnect after losing the touch.

[0050] During welding with the welding torch 1, the welding material and the base material melt at high temperature and undergo chemical reactions, causing chemical reactions among the metal vapor in the weld area, the coating material, and the oxygen, nitrogen, etc. in the surrounding air, generating a series of harmful gases and particulate matters. These toxic gases have health impacts when inhaled by the welding workers, so it is necessary to suck away the poisonous gases during welding. Please refer to Figure 6 , and it also includes a suction assembly 6 provided on the frame. The suction assembly 6 includes a cam 61 and a push-button suction pump 62. The push-button suction pump 62 uses a suction pump in the prior art. The cam 61 is coaxially and fixedly connected to the output shaft of the motor 21. The cam 61 is arranged in cooperation with the push-button suction pump 62. The push-button suction pump 62 is connected with a suction nozzle 63 through a pipeline, and the suction nozzle 63 is arranged on one side of the welding torch 1. During welding, while the motor 21 drives the rear axle to rotate, the cam 61 rotates and collides with the push-button suction pump 62, thereby sucking away the poisonous gases and particulate matters in the welding area to reduce the content of poisonous gases in the welding area.

[0051] During the welding process, defects such as uneven welds and welding slag will be generated, so it is necessary to polish after cooling to make the weld area smooth. Please refer to Figure 7 , the output end of the speed reducer connected to the motor 21 is detachably connected with a grinding wheel 7, and the grinding wheel 7 is arranged in cooperation with the nozzle 41. By the rapid rotation of the motor 21, the grinding wheel 7 is driven to rotate, and then the welding area is polished, and the originally thicker welding area is polished to be the same as the outer diameter of the shaft sleeve 9.

[0052] The frame is also provided with a painting assembly 8. The painting assembly 8 includes a paint gun 81 and a push-button air pump (not shown in the figure). The push-button air pump is arranged in cooperation with the cam 61. The air outlet end of the push-button air pump is communicated with the air inlet end of the paint gun 81 through a pipeline, and the nozzle of the paint gun faces the welding position. After the polishing is completed, it is necessary to paint the welding area. By driving the cam 61 to rotate by the motor 21, the cam 61 intermittently collides with the push-button air pump, thereby providing power for the paint gun 81 to paint the welding position.

[0053] The above are only embodiments of the present invention. Common knowledge such as specific structures and characteristics known in the solutions is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. An automobile rear axle welding device, comprising a frame and a welding torch (1), characterized in that, It further includes a driving assembly (2) provided on the frame, and the driving assembly (2) includes: A driven gear detachably provided on the shaft sleeve (9); A driving gear meshing with the driven gear; A motor (21) whose output shaft is coaxially connected to the driving gear; It further includes a cooling assembly (4) provided on the frame. The cooling assembly (4) includes a nozzle (41) and a cold source tank. The cold source tank is communicated with the nozzle (41), and the gas outlet end of the nozzle (41) faces the bottom of the shaft sleeve (9). The cooling assembly (4) further includes an incomplete gear (42), a first rack (43) and a second rack (44). The incomplete gear (42) is fixedly connected to the output shaft of the motor (21). The first rack (43) and the second rack (44) are arranged in a staggered manner, and the incomplete gear (42) is cooperatively arranged with the first rack (43) and the second rack (44). It further includes a first cylinder (45) and a second cylinder (46) with the same structure. The first rack (43) is connected to the piston rod of the first cylinder (45), and the second rack (44) is connected to the piston rod of the second cylinder (46). The air outlets (47) of the first cylinder (45) and the second cylinder (46) are communicated with the air inlet end of the nozzle (41) through a pipeline. The air inlets (48) of the first cylinder (45) and the second cylinder (46) are communicated with the cold source tank through a pipeline. The pistons (49) of the first cylinder (45) and the second cylinder (46) are connected with compression springs (410), and the free ends of the compression springs (410) are fixedly connected to the cylinder block. The extending directions of the piston rods of the first cylinder (45) and the second cylinder (46) are opposite. The air inlets (48) and the air outlets (47) of the first cylinder (45) and the second cylinder (46) are both arranged on the rear end cover of the cylinder block. The first rack (43) is connected to the piston rod of the first cylinder (45) through a bracket (411).

2. The welding device for the rear axle of an automobile according to claim 1, characterized in that: It further includes a limiting assembly (3) provided on the frame. The limiting assembly (3) includes two symmetrically arranged limiting rollers (31) which are in rolling contact with the shaft sleeve (9). The limiting assembly (3) further includes a guide rail (32) and fixing bolts. The guide rail (32) is provided on the frame, and the limiting rollers (31) are slidably arranged on the guide rail (32) through the fixing bolts.

3. A welding device for an automotive rear axle according to claim 1, characterized in that: Two chutes are symmetrically arranged on the frame, and the first rack (43) and the second rack (44) are respectively slidably arranged in the chutes.

4. The welding device for the rear axle of an automobile according to claim 1, characterized in that: It further includes a detection component (5), the detection component (5) includes a slide rail (51) and a slider (52), the slide rail (51) is fixedly arranged on the frame, the slider (52) is slidably arranged on the slide rail (51), the second rack (44) is cooperatively arranged with the slider (52), the slider (52) is provided with a groove (521), an activity plate (53) is slidably arranged in the groove (521), a reverse switch (54) is arranged on the slider (52), the reverse switch (54) is electrically connected to the motor (21) through a controller, the activity plate (53) is connected with a spring (55), the free end of the spring (55) is connected with the groove (521), the activity plate (53) faces the air outlet end of the nozzle (41), and the activity plate (53) is used for touching the reverse switch (54).

5. The welding device for the rear axle of an automobile according to claim 4, characterized in that: The inner wall of the slide rail (51) abuts against the outer wall of the slider (52).

6. The welding device for an automobile rear axle according to claim 1, characterized in that: It further includes a suction component (6) arranged on the frame, the suction component (6) includes a cam (61) and a pressing suction pump (62), the cam (61) is coaxially and fixedly connected to the output shaft of the motor (21), the cam (61) is cooperatively arranged with the pressing suction pump (62), the pressing suction pump (62) is connected with a suction nozzle (63) through a pipeline, and the suction nozzle (63) is arranged on one side of the welding torch (1).

7. The welding device for the rear axle of an automobile according to claim 1, characterized in that: It further includes a grinding wheel (7), the grinding wheel (7) is coaxially and fixedly connected to the output shaft of the motor (21), and the grinding wheel (7) is cooperatively arranged with the nozzle (41).

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