Automobile rear axle welding device

Abstract

The invention belongs to the technical field of automobile axle welding, and discloses an automobile rear axle welding device which comprises a rack and a welding gun and further comprises a driving assembly arranged on the rack, the driving assembly comprises a driven gear, and the driven gear is detachably arranged on a shaft sleeve; the driving gear is meshed with the driven gear; an output shaft of the motor is coaxially connected with the driving gear; the limiting assembly is arranged on the rack and comprises two symmetrically arranged limiting rollers, and the limiting rollers are in rolling contact with the shaft sleeve; the limiting assembly further comprises a guide rail and a fixing bolt, the guide rail is arranged on the rack, and the limiting roller is slidably arranged on the guide rail through the fixing bolt; the cooling assembly is arranged on the rack and comprises 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 problem that in the prior art, a rear axle cannot be rotationally clamped and welded is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile axle welding, and specifically relates to an automobile rear axle welding device. Background Art

[0002] Refer to the paper "Design and Research of a Special Machine for Circumferential Welding of Three-Section Rear Axle of Automobile". The three-section rear axle of automobile is an important part of the automobile driving 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 three-section rear axles of automobiles needs to ensure quality while continuously improving production efficiency. In the production of rear axles, the welding of bridge packages and half-axle sleeves is relatively important, which involves the welding of three-section rear axles of automobiles. However, the three-section rear axle of an automobile will break under extreme conditions of use. For example, stress such as impact, vibration, and bending moment during vehicle driving will cause material fatigue accumulation and eventually break. The broken rear axle can be repaired by welding and continue to be used.

[0003] See attached Figure 1 According to the prior art, the three-section rear axle of an automobile needs to be clamped and fixed during welding to ensure the alignment and stable positioning between the bridge package and the half-axle sleeve, to prevent weld deviation or welding defects caused by any displacement or vibration, thereby ensuring the welding quality and the structural strength of the rear axle; at the same time, clamping and fixing can also reduce welding deformation, ensuring that the rear axle after welding meets strict dimensional accuracy requirements. The existing rear axle clamping device is fixed by clamping the axle sleeve, and welding is performed at the annular welding position by moving the position of the welding head. For example, referring to the existing document with the publication (announcement) number CN117206738A, a vehicle axle welding device is disclosed, including a workbench; a welding head, the welding head is arranged above the workbench, the welding head is connected to an external controller, and the welding head can be driven by the external controller to move on the X, Y, and Z axes; a placement plate, the placement plate is fixed 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 automobile middle bridge to the axle through the assembly mechanism inside the support frame, and then controls the welding head to move on the X, Y, and Z axes so that the welding head performs welding processing on the connection between the automobile middle bridge and the axle. Although the welding position can be annularly welded by moving the welding head, the cost of this multi-axis drive system is relatively high, and it requires a precise control system and a drive mechanism to ensure the precise movement of the welding head. Secondly, the position of the shaft sleeve and the bridge package is a ring seam, which only needs to be welded, and the movement of the welding head in three axial directions will increase the complexity of the welding process. Furthermore, when manually repairing the broken rear axle, it is necessary to hold a welding gun to weld the welding position. When the upper half of the gap is welded, since the rear axle is clamped and fixed and the lower half of the welding position is blocked by the frame, etc., 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 circle, which reduces the efficiency of welding and increases the labor intensity of manual labor. Summary of the invention

[0005] The purpose of this scheme is to provide a vehicle rear axle welding device to solve the problem that the rear axle cannot be rotated and clamped for welding in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention provides a rear axle welding device for an automobile, comprising a frame and a welding gun, and also comprising a driving assembly arranged on the frame, wherein the driving assembly comprises: A driven gear, the driven gear being detachably mounted on the shaft sleeve; A driving gear meshing with a driven gear; The motor has an output shaft coaxially connected with the driving gear.

[0007] The principle of this scheme is as follows: (1) First, the driven gear is fixed on the shaft sleeve. If the welding gun is fixed on the frame, after the welding gun has welded the point, the motor drives the driving gear to rotate, so that the driven gear drives the shaft sleeve to rotate, and then drives the rear axle to rotate as a whole, so that the next welding point moves to the welding head of the welding gun. (2) If the welding gun is manually held, 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 of the circle is transferred to the upper part, and then the lower half of the circle is welded.

[0008] The effects of this solution are as follows: (1) The drive roller drives the shaft sleeve to rotate, so that 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, which 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, and there is no need to manually rotate the rear axle, which reduces the labor intensity of manual operation, reduces the welding time, and improves production efficiency. At the same time, it also avoids welding position deviation caused by manual rotation. (3) The welding device of this solution is not only suitable for automatic welding with a fixed welding gun, but also for semi-automatic welding with a manual handheld welding gun, and has high flexibility.

[0009] Furthermore, it also includes a limit assembly arranged on the frame, the limit assembly includes two symmetrically arranged limit rollers, and the limit rollers are in rolling contact with the shaft sleeve; the limit assembly 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.

[0010] The principle and effect of this solution are as follows: (1) Two symmetrical limiting rollers are used to clamp the two sides of the shaft sleeve to prevent the rear axle from moving during welding, thereby ensuring the welding quality. (2) Due to the different operating conditions of different models, the diameter of the rear axle sleeve is different. This solution adjusts the position of the limiting roller on the guide rail according to the diameter of the shaft sleeve and locks it with a fixing bolt to adapt to rear axle sleeves of different sizes, without the need to design and manufacture dedicated welding equipment for each shaft sleeve diameter.

[0011] 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 connected to the nozzle, and the air outlet end of the nozzle faces the bottom of the shaft sleeve.

[0012] The principle and effect of this scheme are as follows: During the welding process of the rear axle of the automobile, due to the high temperature, the metal material of the rear axle will expand rapidly. If it is not properly cooled, 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 sleeve and the bridge package. This sub-scheme uses a cold source tank and a nozzle to cool the deposited metal after welding, such as using nitrogen or argon, so as to reduce deformation and stress concentration.

[0013] Furthermore, the cooling component also 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 coordination with the first rack and the second rack; it also 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 connected to the air inlet end of the nozzle through a pipe, the air inlets of the first cylinder and the second cylinder are connected to the cold source tank through a pipe, the pistons of the first cylinder and the second cylinder are connected to a compression spring, and the free end of the compression spring is fixedly connected to the cylinder body.

[0014] The principle and effect of this scheme 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 inlet. 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 rod of the cylinder to extend, so that the piston in the cylinder body squeezes the cold source in the cylinder body, and the cold source is ejected from the nozzle through the air outlet. As the motor output shaft rotates, it also drives the shaft sleeve to rotate, so that the welded area (upper half circle) rotates to the lower half circle. At this time, the nozzle ejects the cold source to the welded area to cool it down. (2) The prior art is to cool down the welding area after welding is completed, which makes the welding area stay in a high temperature state for a long time, which is easy to cause coarse grains and stress concentration in the heat affected zone (HAZ) of the welding part, thereby affecting the welding quality and increasing the risk of welding deformation. In this scheme, the rear axle is rotated during the welding process to cool down 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, after all the annular welding positions are welded, the motor speed can be increased to drive the rear axle to rotate quickly, thereby quickly cooling the entire welding area.

[0015] Furthermore, the piston rods of the first cylinder and the second cylinder are arranged to extend in opposite directions, the air inlet and the air outlet of the first cylinder and the second cylinder are both arranged on the rear end cover of the cylinder body, and the first rack is connected to the piston rod of the first cylinder through a bracket.

[0016] The principle and effect of this scheme are as follows: (1) When the motor drives the rear axle to rotate, it will inevitably cause the incomplete gear to rotate, thereby causing one of the racks to move, and then causing the cylinder piston rod connected to the rack to move, causing the piston to squeeze the internal cold source. At this time, the area that has been welded in the upper half circle has not yet completely rotated to the lower half circle, so the cold source will be wasted in the process of rotating the upper half circle welding area to the lower half circle. (2) In this scheme, since the air inlet and air outlet of the first cylinder and the second cylinder are both arranged on the rear end cover, that is, the piston is arranged at the front end of the air inlet and air outlet, so that the rear end of the piston will not generate space with the cylinder body, and then the cylinder body of the first cylinder and the second cylinder in the initial state will not be filled with cold source. After the piston rod of the first cylinder or the second cylinder is extended, space is generated in the cylinder body, so that the cold source in the cold source tank enters the cylinder body through the air inlet. At the same time, when the incomplete gear rotates to no longer mesh with one of the racks, the piston and the piston rod are reset under the drive of the compression spring, so that the piston squeezes the cold source in the cylinder body, and the cold source enters the nozzle through the air outlet. At this time, the welding area of ​​the upper half circle has rotated to the lower half circle, and the cold source sprayed from the nozzle just sprays into the welding area, thereby avoiding the waste of the cold source.

[0017] Furthermore, the frame is symmetrically provided with two slide grooves, and the first rack and the second rack are slidably arranged in the slide grooves respectively.

[0018] The principle and effect of this solution are: this is the existing technology, and the slide groove provides positioning and guiding functions for the movement of the first rack and the second rack to avoid dislocation.

[0019] Furthermore, it also includes a detection component, which includes a slide rail and a slider, the slide rail is fixed on the frame, the slider is slidably set on the slide rail, the second rack is cooperated with the slider, the slider is provided with a groove, a movable plate is slidably set in the groove, a reversing switch is provided on the slider, the reversing switch is electrically connected to the motor through a controller, the movable plate is connected to a spring, the free end of the spring is connected to the groove, the movable plate is opposite to the air outlet end of the nozzle, and the movable plate is used to touch the reversing switch.

[0020] 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.

[0021] Furthermore, the inner wall of the slide rail contacts the outer wall of the slide block.

[0022] 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.

[0023] 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.

[0024] The principle and effect of this scheme are as follows: (1) When the welding gun is welding, the welding material and the base material melt at high temperature and react chemically, causing the metal vapor in the weld area, the coating material, and the oxygen and nitrogen in the surrounding air to react chemically, generating a series of harmful gases and particulate matter. These toxic gases have health effects when inhaled by welders, so the toxic gases need to be sucked away during welding. (2) This scheme reduces the content of toxic gases in the welding area by driving the rear axle to rotate while the motor drives the cam to rotate and collide with the push-type suction pump.

[0025] Furthermore, it also includes a grinding wheel, which is coaxially fixedly connected to the output shaft of the motor, and the grinding wheel is arranged in coordination with the nozzle.

[0026] 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 grinding is required after cooling to make the weld area smooth. This solution uses a motor to rotate quickly, thereby driving the grinding wheel to rotate, and then grinding the welding area, and grinding the originally thicker welding area to the same outer diameter as the shaft sleeve. (2) During grinding, the nozzle sprays air into the grinding area, thereby blowing away the welding slag on the welding area.

[0027] Furthermore, it also includes a paint spraying assembly arranged on the frame, the paint spraying assembly includes a paint spraying gun and a push air pump, the push air pump is arranged in cooperation with a cam, the air outlet end of the push air pump is connected to the air inlet end of the paint spraying gun through a pipe, and the nozzle of the paint spraying gun is facing the welding position.

[0028] The principle and effect of this solution is that after grinding, the welding area needs to be painted to prevent corrosion of the welding area. This solution uses a motor to drive the cam to rotate, so that the cam intermittently collides and presses the air pump, thereby providing power for the paint spray gun to spray paint and maintain the welding position. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the prior art; Figure 2 This is a structural schematic diagram of a vehicle rear axle welding device according to the present invention; Figure 3 It is a schematic diagram of the structure of the cooling assembly of the present invention; Figure 4 The structure of the detection component and the nozzle of the present invention is shown in FIG. Figure 1 ; Figure 5 The structure of the detection component and the nozzle of the present invention is shown in FIG. Figure 2 ; Figure 6 It is a schematic structural diagram of the air intake assembly of the present invention; Figure 7It is a structural schematic diagram of the grinding wheel of the present invention; Figure 8 It is a structural schematic diagram of the paint spraying assembly of the present invention.

[0030] The figure marks in the drawings of the specification include: welding gun 1, drive assembly 2, motor 21, limit assembly 3, limit roller 31, guide rail 32, cooling assembly 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 assembly 5, slide rail 51, slider 52, movable plate 53, reversing switch 54, spring 55, suction assembly 6, cam 61, push-type suction pump 62, suction nozzle 63, grinding wheel 7, paint spraying assembly 8, paint spraying gun 81, shaft sleeve 9, bridge package 10, welding area 11. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the concept and technical effects of 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 part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention: Example: See also Figure 2 A welding device for a rear axle of an automobile includes a frame (not shown in the figure) and a welding gun 1. The welding gun 1 is a welding gun 1 that can automatically fill the welding wire. A driving assembly 2 is provided on the frame. The driving assembly 2 includes a driving gear and a driven gear (not shown in the figure). The driving gear is meshed with the driven gear. The driving gear is connected to a motor 21. The output end of the motor 21 is connected to a reducer. The output end of the reducer is coaxially fixedly connected with the driving gear. The driven gear is a detachable driven gear. During welding, the driven gear is fixed on the shaft sleeve 9 by passing the driven gear through the shaft sleeve 9, and then the rear axle bridge package 10 is placed into the slot through the limit slot so that the bridge package 10 can rotate in the slot, and 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 rear axle as a whole to rotate. If the welding gun 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 of the circle is transferred to the upper side, and then the lower half of the circle is welded, so that the rear axle can be rotated during the welding process without manual rotation of the rear axle.

[0032] In order to prevent the rear axle from moving during the welding process and thus ensure the welding quality, a limiting assembly 3 is also provided on the frame. The limiting assembly 3 includes two symmetrically arranged limiting rollers 31, and the limiting rollers 31 are in rolling contact with the shaft sleeve 9. The two symmetrical limiting rollers 31 are used to clamp the two sides of the shaft sleeve 9 to prevent the rear axle from moving during the welding process. Since the diameters of the rear axle shaft sleeves of different models are different, it is necessary to adapt to rear axle shaft sleeves 9 of different sizes. The limiting assembly 3 also includes a guide rail 32 and a fixing bolt. The guide rail 32 is provided on the frame, and the limiting roller 31 is slidably provided on the guide rail 32 through the fixing bolt. By adjusting the position of the limiting roller 31 on the guide rail 32 according to the diameter of the shaft sleeve 9 and locking it with the fixing bolt, the rear axle shaft sleeves 9 of different sizes can be adapted.

[0033] See also Figure 2 and Figure 3 During the welding process of the rear axle of the automobile, due to the high temperature, the metal material of the rear axle will expand rapidly. If proper cooling is not performed, 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 sleeve 9 and the bridge package 10. A cooling assembly 4 is also provided on the frame, and the cooling assembly 4 includes a nozzle 41 and a cold source tank (not shown in the figure). The cold source tank is connected to the nozzle 41, and nitrogen is provided in the cold source tank. The gas outlet end of the nozzle 41 faces the bottom of the shaft sleeve 9. The cooling assembly 4 also 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 staggered up and down, and the incomplete gear 42 is matched 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 assembly 4 also 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, 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 connected to the air inlet end of the nozzle 41 through a pipeline, the air inlet 48 of the first cylinder 45 and the second cylinder 46 is connected to the cold source tank through a pipeline, and the piston 49 of the first cylinder 45 and the second cylinder 46 is connected to the compression spring 410, and the free end of the compression spring 410 is fixedly connected to the cylinder body.

[0034] The specific working conditions are as follows: the nitrogen in the cold source tank is supplemented to the cylinder bodies 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 body squeezes the nitrogen in the cylinder body, and the nitrogen is ejected from the nozzle 41 through the air outlet 47. And because the output shaft of the motor 21 rotates, it will also drive the shaft sleeve 9 to rotate, so that the welded area (upper half circle) rotates to the lower half circle, and the nozzle 41 sprays the cold source to the welded area to cool it down. 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 welding of the annular welding positions is completed, the speed of the motor 21 can be accelerated to drive the rear axle to rotate quickly, and the entire welding area can be quickly cooled.

[0035] When the motor 21 drives the rear axle to rotate, it will inevitably cause the incomplete gear 42 to rotate, thereby causing one of the racks to move, and then causing the cylinder piston rod connected to the rack to move so that the piston 49 squeezes the internal nitrogen. At this time, the area that has been welded in the upper half circle has not yet completely rotated to the lower half circle, so nitrogen will be wasted in the process of rotating the upper half circle welding area to the lower half circle. By setting the piston rod extension directions of the first cylinder 45 and the second cylinder 46 in opposite directions, that is, the piston rod extension direction of the first cylinder 45 is downward, and the piston rod extension direction of the second cylinder 46 is upward, and the air inlet 48 and the air outlet 47 of the first cylinder 45 and the second cylinder 46 are both set on the rear end cover of the cylinder body, the first rack 43 is connected to the piston rod of the first cylinder 45 through the bracket 411. By the above arrangement, since the air inlet 48 and the air outlet 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 at the front end of the air inlet 48 and the air outlet 47, so that the rear end of the piston 49 will not generate space with the cylinder body, and then the cylinder body 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 is extended, a space is generated in the cylinder body, so that the nitrogen in the cold source tank enters the cylinder body through the air inlet 48. At the same time, when the incomplete gear 42 rotates to not mesh with 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 body, and the nitrogen passes into the nozzle 41 through the air outlet 47, and at this time, the welding area of ​​the upper half circle has rotated to the lower half circle, and the nitrogen sprayed by the nozzle 41 just sprays to the welding area, thereby avoiding the waste of nitrogen.

[0036] During welding, it is necessary to check whether the welding area is fully penetrated. If the welding area is not fully penetrated, 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 the welding area in real time during the welding process to see if there is any incomplete penetration, and to perform repair welding immediately. Please refer to Figure 4 and Figure 5 , and also includes a detection component 5, which includes a slide rail 51 and a slider 52. The slide rail 51 is fixed on the frame, and the second rack 44 is matched with the slider 52. The slider 52 is slidably arranged on the slide rail 51, and the inner wall of the slide rail 51 is in contact with 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, but 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 the slider 52 is clamped at the extreme position. The slider 52 is provided with a groove 521, and a movable plate 53 is slidably provided in the groove 521. A reversing switch 54 is provided on the slider 52, and the reversing switch 54 is electrically connected to the motor 21 through the controller. The movable plate 53 is connected to a spring 55, and the free end of the spring 55 is connected to the groove 521. The movable plate 53 is opposite to the air outlet end of the nozzle 41, and the movable plate 53 is used to touch the reversing switch 54.

[0037] 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, and after the welding area rotates to the lower half circle, the nozzle 41 sprays gas to the welding area. If the welding area is fully welded, the gas sprayed by the nozzle 41 will be partially blocked by the welding layer, and the movable plate 53 will not be pushed by the gas due to the action of the spring 55, thereby resisting the reversing switch 54. Please refer to Figure 5 If the welding area is not fully welded, part of the gas ejected from the nozzle 41 will not be unobstructed, that is, the gas flow rate blowing toward the movable plate 53 is larger, thereby overcoming the effect of the spring 55 to push the movable plate 53 to make it contact the reversing switch 54. When the reversing switch 54 is contacted and the internal contact is turned on, it indicates that the welding area at this location is not fully welded, and the controller controls the motor 21 to reverse, thereby driving the welding area to reset to the initial welding position, and the welding gun 1 performs repair welding on this position. At the same time, the movable plate 53 is reset under the drive of the spring 55, and the contact of the reversing switch 54 is disconnected after losing the contact.

[0038] When welding with a welding gun 1, the welding material and the base material melt at high temperature and react chemically, causing the metal vapor in the weld area, the coating material, and the oxygen and nitrogen in the surrounding air to react chemically, generating a series of harmful gases and particulate matter. These toxic gases have health effects when inhaled by welders, so the toxic gases need to be sucked away during welding. Figure 6 , and also includes an air suction component 6 arranged on the frame, the air suction component 6 includes a cam 61 and a push-type air suction pump 62, the push-type air suction pump 62 adopts an air pump of the prior art, the cam 61 is coaxially fixedly connected to the output shaft of the motor 21, the cam 61 and the push-type air suction pump 62 are arranged in coordination, the push-type air suction pump 62 is connected to a suction nozzle 63 through a pipeline, and the suction nozzle 63 is arranged on one side of the welding gun 1. When welding, while the motor 21 drives the rear axle to rotate, the cam 61 rotates and collides with the push-type air suction pump 62, thereby sucking away the poisonous gas and particulate matter in the welding area to reduce the content of poisonous gas in the welding area.

[0039] During the welding process, defects such as uneven welds and slag are generated, so grinding is required after cooling to make the weld area smooth. Figure 7 The output end of the 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. The motor 21 rotates rapidly, thereby driving the grinding wheel 7 to rotate, thereby grinding the welding area, and grinding the originally thick welding area to the same outer diameter as the shaft sleeve 9.

[0040] The frame is also provided with a paint spraying assembly 8, which includes a paint spraying gun 81 and a pressing air pump (not shown in the figure). The pressing air pump is arranged in cooperation with the cam 61, and the air outlet of the pressing air pump is connected to the air inlet of the paint spraying gun 81 through a pipeline, and the nozzle of the paint spraying gun is directed toward the welding position. After the grinding is completed, the welding area needs to be painted, and the cam 61 is driven to rotate by the motor 21, so that the cam 61 intermittently collides with the pressing air pump, thereby providing power for the paint spraying gun 81 to spray paint on the welding position.

[0041] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A vehicle rear axle welding device, comprising a frame and a welding gun (1), characterized in that: It also includes a driving assembly (2) arranged on the frame, the driving assembly (2) including: A driven gear, the driven gear being detachably mounted on the shaft sleeve (9); A driving gear meshing with a driven gear; A motor (21), wherein an output shaft of the motor (21) is coaxially connected to the driving gear.

2. The automobile rear axle welding device according to claim 1, characterized in that: The invention also comprises a limiting assembly (3) arranged on the frame, wherein the limiting assembly (3) comprises two symmetrically arranged limiting rollers (31), wherein the limiting rollers (31) are in rolling contact with the shaft sleeve (9); the limiting assembly (3) also comprises a guide rail (32) and a fixing bolt, wherein the guide rail (32) is arranged on the frame, and the limiting roller (31) is slidably arranged on the guide rail (32) via the fixing bolt.

3. The automobile rear axle welding device according to claim 1, characterized in that: It also includes a cooling assembly (4) arranged on the frame, the cooling assembly (4) including a nozzle (41) and a cold source tank, the cold source tank being in communication with the nozzle (41), and an air outlet end of the nozzle (41) facing the bottom of the shaft sleeve (9).

4. The automobile rear axle welding device according to claim 3, characterized in that: The cooling assembly (4) further comprises 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 alternately, and the incomplete gear (42) is arranged in coordination with the first rack (43) and the second rack (44); and further comprises a first cylinder (45) and a second cylinder (46) of the same structure, the first rack (43) and the first cylinder (45) being movable. The piston (49) of the first cylinder (45) and the second cylinder (46) are connected to each other, 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 connected to the air inlet end of the nozzle (41) through a pipeline, the air inlet (48) of the first cylinder (45) and the second cylinder (46) are connected to the cold source tank through a pipeline, and the pistons (49) of the first cylinder (45) and the second cylinder (46) are connected to a compression spring (410), and the free end of the compression spring (410) is fixedly connected to the cylinder body.

5. The automobile rear axle welding device according to claim 4, characterized in that: The piston rods of the first cylinder (45) and the second cylinder (46) are arranged to extend in opposite directions; 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 body; and the first rack (43) is connected to the piston rod of the first cylinder (45) via a bracket (411).

6. The automobile rear axle welding device according to claim 4, characterized in that: The frame is symmetrically provided with two slide grooves, and the first rack (43) and the second rack (44) are respectively slidably arranged in the slide grooves.

7. The automobile rear axle welding device according to claim 4, characterized in that: The invention also comprises a detection component (5), wherein the detection component (5) comprises a slide rail (51) and a slider (52), wherein the slide rail (51) is fixedly arranged on the frame, and the slider (52) is slidably arranged on the slide rail (51), the second rack (44) is arranged in cooperation with the slider (52), the slider (52) is provided with a groove (521), a movable plate (53) is slidably arranged in the groove (521), a reversing switch (54) is arranged on the slider (52), and the reversing switch (54) is electrically connected to the motor (21) through a controller, the movable plate (53) is connected to a spring (55), and the free end of the spring (55) is connected to the groove (521), the movable plate (53) is directly opposite to the air outlet end of the nozzle (41), and the movable plate (53) is used to touch the reversing switch (54).

8. The automobile rear axle welding device according to claim 7, characterized in that: The inner wall of the slide rail (51) abuts against the outer wall of the slide block (52).

9. The automobile rear axle welding device according to claim 1, characterized in that: The machine also includes an air suction component (6) disposed on the frame, the air suction component (6) including a cam (61) and a push-type air suction pump (62), the cam (61) being coaxially fixedly connected to an output shaft of the motor (21), the cam (61) and the push-type air suction pump (62) being arranged in coordination, the push-type air suction pump (62) being connected to a suction nozzle (63) via a pipeline, and the suction nozzle (63) being arranged on one side of the welding gun (1).

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

Images