An automotive rear lower control arm welding device

Abstract

The present invention provides a welding device for the rear lower control arm of an automobile, which includes a base. A bracket and a side positioning block for positioning a connecting block are arranged at the upper end of the base. Two lower positioning columns for positioning the control arm are elastically telescopically arranged at the upper end of the base. A cylinder is arranged at the top of the bracket with its piston rod end facing downward. A flat plate is horizontally arranged at the end of the piston rod of the cylinder. The left and right sides of the lower end of the flat plate are respectively connected with a left connecting column and a right connecting column. The end of the right connecting column is connected with a positioning member for positioning the upper cover plate and the control arm. An inner horizontal welding assembly is connected to the left connecting column. The advantages of the present invention are as follows: After the control arm and the upper cover plate are positioned by the positioning member, the upper cover plate is automatically aligned by the displacement member, and the outer arc of the upper cover plate is rotationally welded and the inner horizontal welding of the connecting block is completed, with high automation and improved welding quality.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and particularly to a welding device for an automotive rear lower control arm. Background Art

[0002] An automotive multi-link suspension system can provide support for both the upper and lower parts of the wheels, and has good strength and stability. The rear lower control arm is an important component of the multi-link suspension, mainly bearing various forces and torques transmitted by the tire during vehicle driving, and is widely applicable to fuel vehicles and new energy vehicles. The rear lower control arm is composed of a connecting block, an upper cover plate, and an integrally formed control arm. Two circular holes are arranged on the bottom of the control arm and are distributed left and right. After the control arm is processed, it is necessary to perform circumferential welding on the outer circle of the upper cover plate and the outer arc of the upper end surface of the control arm, and perform transverse welding on the inner side of the connecting block and the control arm, as shown in Figure 6 , 7 , 8. Currently, the welding of the upper cover plate and the connecting block is completed manually. Not only is it necessary to repeatedly adjust the upper cover plate so that the axis of the upper cover plate coincides with the axis of the right hole at the bottom of the control arm, but also the upper cover plate needs to be aligned so that the left end face of the upper cover plate remains vertical. Then, it is necessary to clamp the connecting block and the upper cover plate while performing welding operations on the connecting block and the upper cover plate. During the welding process, it is also necessary to perform circumferential welding on the outer arcs of the front and back sides of the upper cover plate and transverse welding on the front and back sides of the connecting block, which is time-consuming and laborious and difficult to ensure the welding quality. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a welding device for an automotive rear lower control arm, which positions the control arm and the upper cover plate through a positioning member, and then automatically aligns the upper cover plate, performs circumferential welding on the outer arc of the upper cover plate, and performs transverse welding on the connecting block, with high automation and improved welding quality.

[0004] The present invention provides a welding device for a rear lower control arm of an automobile, comprising a base 1, wherein a bracket 2 and a side positioning block 3 for positioning a connecting block are arranged at the upper end of the base 1, and two lower positioning columns 4 for positioning the control arm are elastically and telescopically arranged at the upper end of the base 1, and a cylinder 5 is arranged downward at the top end of the bracket 2, and a flat plate 6 is transversely arranged at the end of the piston rod of the cylinder 5, and the left and right sides of the lower end of the flat plate 6 are respectively connected to a left connecting column and a right connecting column, and the end of the right connecting column is connected to a positioning member 7 for positioning an upper cover plate and a control arm. The left connecting column is connected to an inner horizontal welding component 11, and the inner horizontal welding component 11 is slidably equipped with a displacement member 9 driven by a servo motor 8, and the flat plate 6 and the right connecting column are provided with an outer arc welding component 12. A return component 10 is provided at the bottom of the displacement component 9. During the rightward movement of the displacement component 9, the displacement component 9 first drives the return component 10 to return the upper cover plate, and the displacement component 9 then drives the inner horizontal welding component 11 and the outer arc welding component 12 to weld the connecting block and the upper cover plate respectively.

[0005] Furthermore, the positioning member 7 is composed of a middle positioning plate 7.2 connected to an upper pressure plate 7.1 and a lower upper positioning column 7.3. The lower edge of the positioning plate 7.3 is provided with a rounded corner. The upper positioning column 7.3 corresponds to the lower positioning column 4 in upper and lower directions.

[0006] Furthermore, the displacement member 9 is composed of a middle horizontal bar 9.1 connecting the side thrust parts 9.4 and the mounting parts 9.3 on the left and right sides. A rack 9.2 is laterally arranged on the rear side of the upper end of the horizontal bar 9.1. A driving gear 15 meshing with the rack 9.2 is keyed on the output shaft of the servo motor 8. Partial teeth 9.5 are laterally arranged at the front end of the horizontal bar 9.1, and an avoidance groove 9.6 is opened on the left side of the front end of the horizontal bar 9.1.

[0007] Furthermore, the return assembly 10 includes a fixed tube 10.1 transversely arranged at the lower end of the mounting portion 9.3, a telescopic groove is transversely opened in the fixed tube 10.1, a telescopic rod 10.2 is slidably arranged in the telescopic groove, a first elastic member connecting the telescopic rod 10.2 and the telescopic groove is arranged in the telescopic groove, and a push block 10.3 is longitudinally arranged at the end of the telescopic rod 10.2.

[0008] Furthermore, the inner horizontal welding assembly 11 includes a fixing plate 11.1 horizontally connected to the left connecting column. On the front and rear sides of the upper end of the fixing plate 11.1, sliding holes 11.2 are transversely and symmetrically formed. A sliding rod 11.3 is transversely arranged in the sliding holes 11.2. A slider 11.4 that can be laterally pushed by the side pushing portion 9.4 is slidably fitted at the sliding holes 11.2 and the sliding rod 11.3. A second elastic member connecting the sliding holes 11.2 and the slider 11.4 is sleeved outside the sliding rod 11.3. A first welding torch is arranged at the bottom of the slider 11.4.

[0009] Furthermore, the first welding torch is inclined inwards and locked to the bottom of the slider 11.4 through a first locking bolt.

[0010] Furthermore, a guide block 14 for slidably fitting the cross bar 9.1 and the rack 9.2 is arranged at the rear end of the fixing plate 11.1.

[0011] Furthermore, the outer arc welding assembly 12 includes a locking gear 12.1 rotatable below the flat plate 6. The locking gear 12.1 can be locked by the cross bar 9.1 and is matched with the partial teeth 9.5. A first large gear 12.2 is coaxially connected above the locking gear 12.1. A small gear 12.3 is meshed with the right end of the first large gear 12.2. A second large gear 12.4 is coaxially connected above the small gear 12.3. A tooth ring 12.5 meshed with the second large gear 12.4 is rotatably arranged at the upper end of the right connecting column. Two fixing columns 12.6 are circumferentially and uniformly distributed along the axis of the tooth ring 12.5. A second welding torch is arranged at the bottom of the fixing column 12.6.

[0012] Furthermore, the second welding torch is inclined outwards and locked to the bottom of the fixing column 12.6 through a second locking bolt, and the second welding torch intersects with the axis of the tooth ring 12.5.

[0013] Furthermore, guide rods 13 are vertically and symmetrically arranged on the left and right sides of the upper end of the flat plate 6. The guide rods 13 are slidably fitted up and down on the bracket 2.

[0014] The advantages of the present invention are as follows: The control arm and the upper cover plate are positioned by the positioning member, and then the upper cover plate is automatically aligned by the displacement member. The outer arc of the upper cover plate is rotated and welded, and the inner horizontal welding of the connecting block is completed. The degree of automation is high and the welding quality is improved. The air cylinder drives the positioning member, the servo motor, the displacement member, the alignment component, the inner horizontal welding component, and the outer arc welding component to descend to the bottom through the flat plate, so that the welding torch is aligned with the welding position while the upper cover plate and the control arm are positioned. The connecting block is positioned by the side positioning block, and the upper positioning column presses the lower positioning column into the two holes of the control arm to prevent the control arm from rotating. After the positioning plate enters the inner circle of the upper cover plate, the pressing plate slightly presses the upper cover plate, so that the axis of the upper cover plate is in the correct position for subsequent alignment of the upper cover plate, thereby positioning the upper cover plate and the control arm. The servo motor drives the displacement member to move rightward through the rack, and the erection part of the displacement member drives the alignment component to move rightward, thereby aligning the upper cover plate. The side pushing part and part of the teeth drive the inner horizontal welding component and the outer arc welding component to weld the connecting block and the upper cover plate respectively. The pushing block on the telescopic rod contacts the side surface of the upper cover plate that can only rotate and aligns the upper cover plate. The pushing block presses the side surface of the upper cover plate under the action of the first elastic member and maintains the side pressure in the subsequent process, thereby positioning the upper cover plate. The side pushing block of the displacement member pushes the slider to move rightward along the sliding groove and the sliding rod. The slider drives the first welding torch to move rightward. The first welding torch performs horizontal welding on the inner sides of the connecting block and the control arm. The slider and the first welding torch move to the end. At the same time, part of the teeth of the displacement member mesh with the locking gear. The locking gear drives the second large gear to rotate through the first large gear and the small gear. The second large gear drives the tooth ring to rotate. The tooth ring drives the two fixed columns and the second welding torch to rotate. The second welding torch performs outer arc rotation welding on the outer ring of the upper cover plate. The first welding torch inclined inward can perform welding on the connecting block on the inner side of the control arm to ensure the welding quality. The second welding torch inclined outward performs rotation welding on the outer ring of the upper cover plate on the upper end surface of the control arm through rotation to ensure the welding quality, and the intersection of the axis of the second welding torch and the tooth ring can make the welding accurate and in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a perspective view of the present invention;

[0016] Figure 2 is a structural schematic diagram of the present invention;

[0017] Figure 3 is a front view of the present invention;

[0018] Figure 4 is a top view of the present invention;

[0019] Figure 5 is Figure 4 the A-A sectional view of;

[0020] Figure 6 is a structural schematic diagram of the present invention when the control arm, the connecting block, and the upper cover plate are placed;

[0021] Figure 7 It is a top view of the present invention when the control arm, connecting block, and upper cover plate are properly placed;

[0022] Figure 8 It is a cross-sectional view of the present invention when the flat plate moves down to the bottom and the positioning member positions the control arm and the upper cover plate;

[0023] Figure 9 It is a cross-sectional view of the present invention when the displacement member moves to the right and the push block returns the upper cover plate to its original position;

[0024] Figure 10 It is a cross-sectional view of the present invention when the displacement member moves to the right to the end and the welding torch completes welding;

[0025] Figure 11 is Figure 2 an enlarged view of part B of

[0026] Figure 12 is Figure 6 an enlarged view of part C of

[0027] Figure 13 is Figure 9 an enlarged view of part D of

[0028] Figure 14 It is a structural schematic diagram of the displacement member of the present invention;

[0029] Figure 15 It is a structural schematic diagram of the positioning member of the present invention. Detailed Embodiment

[0030] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Refer to Figures 1 to 15, the present invention provides an automotive rear lower control arm welding device, which includes a base 1. At the upper end of the base 1, there are a bracket 2 and a side positioning block 3 for positioning the connecting block. The side positioning block is L-shaped, and at the upper end of the side positioning block, there is a placement groove for placing the connecting block. The front and rear sides of the connecting block are defined by the inner side walls of the control arm, and the left and right sides of the connecting block are defined by the placement groove. At the upper end of the base 1, there are two lower positioning columns 4 for positioning the control arm, which are elastically telescopic. At the top of the bracket 2, a cylinder 5 is arranged downward. At the end of the piston rod of the cylinder 5, a flat plate 6 is arranged horizontally. On the left and right sides of the upper end of the flat plate 6, guide rods 13 are vertically and symmetrically arranged. The guide rods 13 are slidably fitted to the bracket 2 for up and down movement. The guide rods can guide the movement of the piston rod to ensure that there is no lateral deviation during its movement, so as to avoid damaging the cylinder. On the left and right sides of the lower end of the flat plate 6, a left connecting column and a right connecting column are respectively connected. At the end of the right connecting column, there is a positioning member 7 for positioning the upper cover plate and the control arm. An inner horizontal welding assembly 11 is connected to the left connecting column. A displacement member 9 driven by a servo motor 8 is slidably fitted on the inner horizontal welding assembly 11 for left and right movement. An outer arc welding assembly 12 is arranged on the flat plate 6 and the right connecting column. At the bottom of the displacement member 9, there is a return component 10. During the rightward movement of the displacement member 9, the displacement member 9 first drives the return component 10 to square the upper cover plate, and then the displacement member 9 drives the inner horizontal welding assembly 11 and the outer arc welding assembly 12 to weld the connecting block and the upper cover plate respectively. Place the control arm on the base and let the two lower positioning columns enter the two holes of the control arm to prevent the control arm from rotating. The side positioning column extends into the left side of the control arm. Place the connecting block and the upper cover plate on the side positioning column and the control arm respectively. The cylinder drives the flat plate to move downward. The flat plate drives the positioning member, the servo motor, the displacement member, the return component, the inner horizontal welding assembly, and the outer arc welding assembly to descend to the bottom through the left connecting column and the right connecting column. The positioning member positions the upper cover plate and the control arm and slightly presses the upper cover plate. The servo motor drives the displacement member to move rightward. The displacement member first drives the return component to square the upper cover plate, and then the displacement member drives the inner horizontal welding assembly and the outer arc welding assembly to weld the connecting block and the upper cover plate respectively (the inner sides of the connecting block and the control arm are horizontally welded, and the outer circle of the upper cover plate and the upper end face of the control arm are arc welded). After welding is completed, the servo motor drives the displacement member to move leftward to reset, and the displacement member drives the return component, the inner horizontal welding assembly, and the outer arc welding assembly to reset. Then the cylinder drives the flat plate to drive each component to move upward to reset.

[0032] The positioning member 7 is composed of a pressing plate 7.1 on the upper side and an upper positioning post 7.3 on the lower side connected by a positioning plate 7.2 in the middle. The lower edge of the positioning plate 7.3 is provided with a chamfered corner, and the chamfered corner is provided to enable the positioning plate to smoothly enter the inner ring of the upper cover plate. The upper positioning post 7.3 corresponds to the lower positioning post 4 up and down. The air cylinder drives the flat plate and the positioning member to move downward, and the upper positioning post presses the lower positioning post into the two holes of the control arm to prevent the control arm from rotating. After the positioning plate enters the inner ring of the upper cover plate, the pressing plate slightly presses the upper cover plate, so that the axis of the upper cover plate is in the correct position (the axis of the arc-shaped inner wall in the middle of the control arm and the axis of the right hole at the bottom of the control arm coincide, and the axis of the upper cover plate can coincide with the axis of the right hole at the bottom of the control arm), so as to correct the upper cover plate subsequently, and thus position the upper cover plate and the control arm well.

[0033] Refer to Figure 2 , Figure 11 , Figure 14 , the displacement member 9 is composed of a cross bar 9.1 in the middle connecting the side pushing parts 9.4 and the erection parts 9.3 on the left and right sides. A rack 9.2 is horizontally arranged at the rear side of the upper end of the cross bar 9,1. A driving gear 15 meshing with the rack 9.2 is keyed on the output shaft of the servo motor 8. Part of the teeth 9.5 are horizontally arranged at the front end of the cross bar 9.1. An avoidance groove 9.6 is opened at the left side of the front end of the cross bar 9.1. The servo motor drives the driving gear to rotate, and the driving gear makes the displacement member move rightward through the rack. The erection part of the displacement member drives the alignment assembly to move rightward, so as to align the upper cover plate. The side pushing part and the part of the teeth drive the inner horizontal welding assembly and the outer arc welding assembly to weld the connecting block and the upper cover plate respectively.

[0034] The alignment assembly 10 includes a fixed tube 10.1 horizontally arranged at the lower end of the erection part 9.3. A telescopic groove is horizontally opened in the fixed tube 10.1. A telescopic rod 10.2 is slidably fitted in the telescopic groove. A first elastic member connecting the telescopic rod 10.2 and the telescopic groove is arranged in the telescopic groove. A pushing block 10.3 is longitudinally arranged at the end of the telescopic rod 10.2. When the displacement member moves rightward, the erection part of the displacement member drives the alignment assembly to move rightward. The pushing block on the telescopic rod contacts the side surface of the upper cover plate that can only rotate and aligns the upper cover plate (when the staff places the upper cover plate, it will basically deflect a little). The pushing block presses the side surface of the upper cover plate under the action of the first elastic member and maintains the side pressure in the subsequent process, so as to position the upper cover plate.

[0035] The inner horizontal welding assembly 11 includes a fixing plate 11.1 horizontally connected to the left connecting column. On the front and rear sides of the upper end of the fixing plate 11.1, sliding holes 11.2 are transversely and symmetrically formed. A receiving hole for a sliding rod and a second elastic member to extend into is provided at the right end of the sliding hole. A sliding rod 11.3 is transversely arranged in the sliding hole 11.2. A slider 11.4 that can be laterally pushed by a lateral pushing portion 9.4 is slidably fitted at the sliding hole 11.2 and the sliding rod 11.3. A second elastic member connecting the sliding hole 11.2 and the slider 11.4 is sleeved outside the sliding rod 11.3. A first welding torch is provided at the bottom of the slider 11.4. When the displacement member moves rightward, the lateral pushing block of the displacement member pushes the slider to move rightward along the sliding groove and the sliding rod. The slider drives the first welding torch to move rightward. The first welding torch performs horizontal welding on the inner sides of the connecting block and the control arm. After the slider and the first welding torch move rightward to the end, the welding is completed. When the displacement member moves leftward to reset, the slider and the first welding torch move leftward to reset under the action of the second elastic member.

[0036] Refer to Figure 8 , Figure 12 , the first welding torch is inclined inward and locked to the bottom of the slider 11.4 through a first locking bolt. The welding position of the connecting block is on the inner side of the control arm. The inclined inward first welding torch moves horizontally to weld the connecting block to ensure the welding quality.

[0037] Guide blocks 14 for slidably fitting a cross bar 9.1 and a rack 9.2 are provided at the rear end of the fixing plate 11.1. The guide blocks are distributed on both sides of the driving gear, and the lateral movement of the displacement member is ensured through the guide blocks.

[0038] Refer to Figure 2 , Figure 4 , Figure 5, the outer arc welding assembly 12 includes a locking gear 12.1 that rotates below the flat plate 6. The locking gear 12.1 can be locked by the cross bar 9.1 and cooperates with a part of the teeth 9.5. The part of the teeth drives the locking gear to rotate. After the part of the teeth disengages from the locking gear, the locking gear is locked by the cross bar of the displacement member. A first large gear 12.2 is coaxially connected above the locking gear 12.1. A small gear 12.3 is engaged with the right end of the first large gear 12.2. A second large gear 12.4 is coaxially connected above the small gear 12.3. A tooth ring 12.5 that meshes with the second large gear 12.4 is rotatably provided at the upper end of the right connecting column. Two fixing columns 12.6 are circumferentially and uniformly distributed along the axis of the tooth ring 12.5. A second welding torch is provided at the bottom of the fixing column 12.6. When the displacement member moves to the right, the push block returns the upper cover plate to the correct position and keeps it pressing against the upper cover plate laterally. Then, a part of the teeth of the displacement member meshes with the locking gear. The locking gear drives the second large gear to rotate through the first large gear and the small gear. The second large gear drives the tooth ring to rotate. The tooth ring drives the two fixing columns and the second welding torch to rotate around. The second welding torch performs outer arc circumferential welding on the outer ring of the upper cover plate and the upper end surface of the control arm. After the welding is completed, the displacement member moves to the left to reset. The part of the teeth of the displacement member drives the tooth ring and the second welding torch to reverse and reset. Then, the part of the teeth disengages from the locking gear, and the locking gear is locked by the cross bar of the displacement member.

[0039] The second welding torch is tilted outward and locked to the bottom of the fixing column 12.6 by a second locking bolt. The second welding torch intersects with the axis of the tooth ring 12.5. The welding position of the outer ring of the upper cover plate is on the upper end surface of the control arm. The second welding torch tilted outward performs welding by rotating around to ensure the welding quality. Moreover, the intersection of the second welding torch and the axis of the tooth ring can make the welding accurate and in place.

[0040] The specific working process of the present invention is as follows: Place the control arm on the base, and the two lower positioning columns enter the two holes of the control arm to prevent the control arm from rotating. The side positioning column extends into the left side of the control arm. Place the connecting block and the upper cover plate above the side positioning column and the control arm respectively, as Figure 6 , Figure 7 shown. The air cylinder drives the flat plate to move downward. The flat plate drives the positioning member, the servo motor, the displacement member, the return component, the inner horizontal welding component, and the outer arc welding component to descend to the bottom through the left connecting column and the right connecting column. The first welding torch and the second welding torch are aligned with the welding position. The upper positioning column presses the lower positioning column into the two holes of the control arm to prevent the control arm from rotating. The positioning plate enters the inner ring of the upper cover plate, and then the pressing plate slightly presses the upper cover plate so that the axis of the upper cover plate is in the correct position for the subsequent return of the upper cover plate, thereby positioning the upper cover plate, the control arm, and the connecting block, as Figure 8As shown, the servo motor drives the displacement member to move rightward. The erection part of the displacement member drives the alignment component to move rightward. The push block on the telescopic rod contacts the side surface of the upper cover plate that can only rotate and aligns the upper cover plate (when the staff places the upper cover plate, it will basically deflect a little). Under the action of the first elastic member, the push block presses against the side surface of the upper cover plate and maintains the side pressure during the subsequent process, thereby positioning the upper cover plate. As Figure 9 shown, then the displacement member continues to move rightward. The side push block of the displacement member pushes the slider to move rightward along the chute and the slide rod. The slider drives the first welding torch to move rightward. The first welding torch performs horizontal welding on the inner sides of the connecting block and the control arm. The slider and the first welding torch move to the end. At the same time, some teeth of the displacement member mesh with the locking gear. The locking gear drives the second large gear to rotate through the first large gear and the small gear. The second large gear drives the toothed ring to rotate. The toothed ring drives the two fixed columns and the second welding torch to rotate around. The second welding torch performs arc welding on the outer ring of the upper cover plate and the upper end surface of the control arm. The connection between the connecting block and the upper cover plate is completed. As Figure 10 shown, the servo motor drives the displacement member to drive the alignment component to move leftward and reset. The slider and the first welding torch move leftward and reset under the action of the second elastic member. At the same time, some teeth of the displacement member drive the toothed ring and the second welding torch to reverse and reset. Then some teeth disengage from the locking gear. The locking gear is locked by the cross bar of the displacement member. Then the air cylinder drives the flat plate to drive each component to move upward and reset.

[0041] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An automotive rear lower control arm welding device, characterized in that: The invention comprises a base, wherein the upper end of the base is provided with a bracket and a side positioning block for positioning the connecting block, the upper end of the base is elastically and telescopically provided with two lower positioning columns for positioning the control arm, the top end of the bracket is provided with a cylinder downwardly, the piston rod end of the cylinder is transversely provided with a plate, the left and right sides of the lower end of the plate are respectively connected with a left connecting column and a right connecting column, the end of the right connecting column is connected with a positioning piece for positioning the upper cover plate and the control arm, the left connecting column is connected with an inner horizontal welding assembly, and the inner horizontal welding assembly is movable left and right The floor slide is equipped with a displacement member driven by a servo motor. The flat plate and the right connecting column are provided with an outer arc welding assembly. The bottom of the displacement member is provided with a return assembly. During the rightward movement of the displacement member, the displacement member first causes the return assembly to return the upper cover plate, and the displacement member then drives the inner horizontal welding assembly and the outer arc welding assembly to weld the connecting block and the upper cover plate respectively. The displacement member is composed of a middle horizontal bar connecting the side thrust part and the erection part on the left and right sides. The horizontal bar is provided with a rack laterally on the rear side of the upper end. The servo A driving gear meshing with the rack is keyed on the output shaft of the motor, a partial tooth is transversely arranged at the front end of the cross bar, an avoidance groove is provided on the left side of the front end of the cross bar, the inner transverse welding assembly comprises a fixing plate horizontally connected to the left connecting column, sliding holes are transversely and symmetrically provided on the front and rear sides of the upper end of the fixing plate, a sliding rod is transversely arranged in the sliding hole, a sliding block that can be pushed sideways by the side pushing part is slidably provided at the sliding hole and the sliding rod, a second elastic member connecting the sliding hole and the sliding block is provided on the outer sleeve of the sliding rod, and the sliding block A first welding gun is arranged at the bottom, and the outer arc welding assembly includes a locking gear rotating under the flat plate, the locking gear can be locked by the horizontal bar and cooperate with the partial teeth, a first large gear is coaxially connected to the top of the locking gear, a small gear is meshed at the right end of the first large gear, a second large gear is coaxially connected to the top of the small gear, a gear ring meshing with the second large gear is rotatably arranged at the upper end of the right connecting column, two fixed columns are evenly distributed on the gear ring along the circumference of its axis, and a second welding gun is arranged at the bottom of the fixed column.

2. The welding device for the rear lower control arm of an automobile according to claim 1, characterized in that: The positioning member is composed of a middle positioning plate connected to an upper pressure plate and an upper positioning column at a lower side. The lower edge of the positioning plate is provided with a rounded corner. The upper positioning column corresponds to the lower positioning column up and down.

3. The welding device for the rear lower control arm of an automobile according to claim 1, characterized in that: The return assembly includes a fixed tube transversely arranged at the lower end of the erection part, a telescopic groove is transversely opened in the fixed tube, a telescopic rod is slidably fitted in the telescopic groove, a first elastic member connecting the telescopic rod and the telescopic groove is arranged in the telescopic groove, and a push block is longitudinally arranged at the end of the telescopic rod.

4. A welding device for the rear lower control arm of an automobile according to claim 1, characterized in that: The first welding gun is locked to the bottom of the sliding block in an inclined manner inwardly by a first locking bolt.

5. The welding device for the rear lower control arm of an automobile according to claim 1, characterized in that: A guide block for slidingly fitting the horizontal bar and the rack is arranged at the rear end of the fixing plate.

6. The welding device for the rear lower control arm of an automobile according to claim 1, wherein: The second welding gun is locked to the bottom of the fixing column in an oblique manner outwardly through a second locking bolt, and the second welding gun intersects with the axis of the gear ring.

7. The welding device for the rear lower control arm of an automobile according to claim 1, wherein: Guide rods are vertically and symmetrically arranged on the left and right sides of the upper end of the flat plate, and the guide rods are slidably fitted to the bracket for up and down movement.

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