Welding device for automobile lower swing arm assembly

Abstract

The invention discloses an automobile lower swing arm assembly welding device, and relates to the technical field of welding. The device comprises a device body, supporting legs are fixedly installed at the four corners of the bottom of the device body, a workbench is arranged at the center of the top of the device body, two limiting plates are arranged at the top of the device body and located on the periphery of the workbench, and electric hydraulic sliding rails are arranged on the left side and the right side of the top of the device body; an inclined rod is hinged to the outer wall of the telescopic end of the side, close to the workbench, of the electric hydraulic sliding rail, an L-shaped plate is hinged to the bottom of the inclined rod, a vertical plate is hinged to the right side of the L-shaped plate, an arc-shaped plate is hinged to the right side of the vertical plate, and a soft capsule is fixedly installed on the side, close to the center of the workbench, of the arc-shaped plate. Through cooperation of the L-shaped plate, the vertical plate, the arc-shaped plate and the soft capsule, the soft capsule rapidly clamps a workpiece with an irregular outer wall, the welding stability of the workpiece is guaranteed, and the welding process is simplified.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a welding device for an automobile lower swing arm assembly. Background Art

[0002] The lower arm of a car is mainly used for guiding and supporting the suspension. Its deformation affects the wheel positioning and reduces driving stability. The lower arm of a car is one of the swing arms on the car. Its main function is to support the body and shock absorber and buffer vibrations during driving.

[0003] Patent announcement number CN104759777B discloses a welding unit for processing a lower swing arm welding assembly of an automobile, including a robot welding arm and a welding part clamping fixture group arranged around the robot welding arm, wherein the welding part clamping fixture group is divided into a left part clamping fixture group and a right part clamping fixture group, wherein the left part clamping fixture group includes a left part inner support welding fixture, a left part positioning welding fixture and a left part edge sealing fixture, and the right part clamping fixture group includes a right part inner support welding fixture, a right part positioning welding fixture and a right part edge sealing fixture, and the components of the left part clamping fixture group and the components of the right part clamping fixture group are arranged symmetrically. Beneficial effects of the patent: the patent has a simple structure, is easy to use, and the processed lower swing arm welding assembly has high precision and long service life, and the clamping degree of the clamp components is high during use, which further improves the overall processing precision of the lower swing arm welding.

[0004] However, the device still has some shortcomings: the device can improve the welding accuracy of the workpiece, but during the welding process, the robot needs to fix the workpiece when it descends to weld. When fixing irregular-shaped workpieces, the fixing component is difficult to quickly fix the workpiece and stabilize it, which brings certain inconveniences to the welding process. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a welding device for a lower swing arm assembly of an automobile, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a welding device for a lower arm assembly of an automobile, comprising a device body, support legs are fixedly installed at the four corners of the bottom of the device body, a workbench is arranged at the center of the top of the device body, two limit plates are arranged on the top of the device body, and the two limit plates are located on the periphery of the workbench, electric hydraulic slide rails are arranged on the left and right sides of the top of the device body, a welding assembly is arranged inside the electric hydraulic slide rail, an outer wall of the telescopic end of the electric hydraulic slide rail close to the workbench side is hinged with an oblique rod, an L-shaped plate is hinged at the bottom of the oblique rod, a vertical plate is hinged on the right side of the L-shaped plate, an arc plate is hinged on the right side of the vertical plate, and the arc plate is hinged on the right side of the arc plate. A soft capsule is fixedly installed on one side of the plate close to the center of the workbench, and the electric hydraulic slide is started. The telescopic end of the electric hydraulic slide drives the welding assembly to descend to the specified welding height to weld the workpiece; when the electric hydraulic slide descends, it drives the inclined rod to move synchronously, and the inclined rod causes its own hinge point to start rotating through the resistance force of the L-shaped plate, and the inclined rod pushes the L-shaped plate to move toward the workbench, and the L-shaped plate drives the vertical plate to move synchronously, and the vertical plate drives the arc plate to move synchronously, and the arc plate is limited by the limit plate. At this time, the arc plate uses its own toughness and the limit of the limit plate to make its own concave surface slide close to the outer wall of the workbench, and the arc plate drives the soft capsule to move synchronously, and the soft capsule is deformed by contact with the workpiece.

[0007] According to the above technical solution, the bottom of the L-shaped plate contacts the top of the device body, the limit plate is located on the arc motion trajectory of the outer wall of the arc plate close to the center of the workbench, and the concave surface of the arc plate contacts the arc surface of the workbench, the arc plate has toughness, the soft capsule is a arc capsule, and an observation device is provided inside the soft capsule to facilitate the staff to monitor the weld.

[0008] According to the above technical scheme, a reciprocating screw is rotatably installed at the bottom of the inner wall of the soft capsule, a sliding ring is sleeved and slidably installed on the outer wall of the reciprocating screw, a push rod is hinged on the outer wall of the sliding ring and the inner wall of the soft capsule close to the center of the workbench, a telescopic column is fixedly installed at the top edge of the sliding ring, the telescopic end of the telescopic column passes through the top of the soft capsule, and a spring is built into the telescopic column, and a blade plate is fixedly installed on the top of the telescopic end of the telescopic column. The soft capsule is deformed by the resistance force between the soft capsule and the workpiece, and the soft capsule drives the push rod to move synchronously, and the push rod drives the sliding ring to slide downward along the outer wall of the reciprocating screw. When the soft capsule is reset subsequently, the push rod pulls the sliding ring to reset, and the sliding ring drives the telescopic column to move downward, and the telescopic end of the telescopic column drives the blade plate to move synchronously. At the same time, when the bottom of the blade plate contacts the workpiece, it continues to descend through the telescopic end of the telescopic column.

[0009] According to the above technical scheme, the observation device includes a telescopic rod, a connecting rod, an arc-shaped piece and a telescopic angle plate. The top of the telescopic rod is fixedly installed at the bottom edge of the sliding ring, the connecting rod is hinged at one end close to the reciprocating screw rod on the outer wall of the telescopic end of the telescopic rod, the concave surface of the arc-shaped piece is hinged on the back of the telescopic end of the connecting rod, and the arc surface of the arc-shaped piece fits with the concave surface of the soft capsule, the bottom of the telescopic angle plate is fixedly installed at the bottom angle of the inner wall of the soft capsule, and the top of the telescopic end of the telescopic angle plate contacts the bottom of the arc-shaped piece, and an anti-gap device is arranged under the telescopic rod to avoid the existence of a gap between the workpiece and the soft capsule after the workpiece is fixed. When the sliding ring descends, it drives the telescopic rod to move synchronously, the telescopic end of the telescopic rod drives the connecting rod to move synchronously, and the telescopic end of the connecting rod drives the arc-shaped piece to slide synchronously along the concave surface of the soft capsule. When the soft capsule is deformed, it contacts the arc-shaped piece, and the arc-shaped piece shrinks through the telescopic end of the connecting rod to avoid blocking the deformation of the soft capsule. At the same time, when the arc-shaped piece descends, it squeezes the telescopic end of the telescopic angle plate to move downward synchronously, and at this time, the arc-shaped piece applies downward pressure on the telescopic angle plate.

[0010] According to the above technical solution, the observation device also includes an L-shaped rod and a mirror panel. The L-shaped rod is fixedly installed on the inner wall of the telescopic end of the telescopic angle plate away from the center of the soft capsule, and the top of the L-shaped rod passes through the top of the soft capsule. The bottom of the mirror panel is hinged to the top of the L-shaped rod. When the telescopic end of the telescopic angle plate moves downward under the pressure of the arc-shaped sheet, it will pull the L-shaped rod to move synchronously. The L-shaped rod pulls the hinge shaft at the bottom of the mirror panel. At this time, the hinge shaft of the mirror panel generates a rotational force and starts to rotate.

[0011] According to the above technical solution, the observation device also includes a fixed plate and a round rod, the bottom of the fixed plate is fixedly installed at the top edge of the soft capsule, the round rod is rotatably installed on the vertical surface of the inner wall of the fixed plate away from the center of the soft capsule, and the round rod is fixedly installed on the outer wall of the mirror plate on the side close to the center of the soft capsule. The mirror plate drives the round rod to rotate along the vertical surface of the fixed plate, and the fixed plate limits the round rod and the mirror plate. At this time, the mirror plate rotates and moves in the vertical direction.

[0012] According to the above technical scheme, the anti-gap device includes a slide seat, a U-shaped plate, a telescopic ladder block and two seven-shaped plates, the bottom of the slide seat is fixedly installed at the bottom of the inner wall of the soft capsule, and a slide groove is opened at the bottom of the slide seat, the U-shaped plate is slidably installed inside the slide seat through a spring away from the telescopic rod, and the U-shaped plate is short and long at the bottom, the bottom of the telescopic ladder block is slidably installed on the bottom of the inner wall of the U-shaped plate, the two seven-shaped plates are fixedly installed on the vertical surface of the outer wall of the telescopic ladder block near the center of the soft capsule, and the seven-shaped plate is slidably installed on the outer wall of the slide seat at one end away from the center of the U-shaped plate, and the telescopic rod When the U-shaped plate continues to slide to the slide slot, the U-shaped plate is instantly stuck into the slide slot through the elastic tension between its own spring and the slide seat. At this time, the U-shaped plate no longer resists the inclined surface of the telescopic end of the telescopic ladder block, and the telescopic end of the telescopic ladder block releases the continuous force storage state and moves upward quickly.

[0013] According to the above technical scheme, the anti-gap device also includes a power plate, a hinge plate and a reset plate. The top of the power plate is fixedly installed on the outer wall of the telescopic rod close to the outer wall of the reciprocating screw rod, and the bottom of the power plate is slidably installed on the top of the U-shaped plate. The reset plate is fixedly installed inside the slide groove of the slide seat away from the center of the soft capsule. After the elastic force of the telescopic end of the telescopic ladder block is released, the hinge plate starts to rotate through the torsion of the torsion spring and the telescopic end of the telescopic ladder block is always lower than the telescopic end of the telescopic rod, so that when the hinge plate rotates, it can press the telescopic end of the telescopic ladder block to restore the initial force storage state.

[0014] The present invention provides a welding device for a lower swing arm assembly of an automobile, which has the following beneficial effects: (1) The present invention cooperates with a workbench, a limit plate, an electric hydraulic slide rail and a welding assembly so that the welding assembly slides back and forth inside the electric hydraulic slide rail to achieve welding work; cooperates with an L-shaped plate, a vertical plate, an arc plate and a soft capsule so that the soft capsule can quickly clamp workpieces with irregular outer walls to ensure the welding stability of the workpiece and simplify the welding process; cooperates with a reciprocating screw, a sliding ring, a push rod, a telescopic column and a blade plate so that the blade plate automatically changes its descending height through the deformation amplitude of the soft capsule to cope with the clamping stability of workpieces of different sizes, and at the same time, the blade plate applies downward pressure to the workpiece, thereby secondary improving the welding stability and reducing fluctuations.

[0015] (2) The present invention sets an observation device, and cooperates with a sliding ring, a telescopic rod, a connecting rod, a curved sheet and a telescopic angle plate, so that only the contact surface of the soft capsule with the workpiece is deformed, and the rest of the soft capsule remains in its original state, effectively avoiding the presence of an exposed suspended area between the workpiece and the soft capsule, and ensuring that the fixed workpiece will not be affected when the welding position is adjusted by holding the workpiece; through the cooperation of the L-shaped rod, the mirror plate, the fixed plate and the round rod, the welder holding the workpiece can observe the weld between the two workpieces through the refraction of the mirror plate, which is convenient for the staff to adjust the welding angle or strength in time to ensure the welding quality.

[0016] (3) The present invention sets an anti-gap device, and cooperates with the telescopic rod, the sliding seat, the U-shaped plate, the telescopic ladder block, the seven-shaped plate, the power plate, the hinge plate and the reset plate. Through the above cooperation, after the soft capsule and the workpiece are positioned, the arc-shaped plate is used to perform a secondary fit to the gap caused by the slight deformation of the soft capsule due to the change in external temperature, so that the soft capsule and the workpiece are always closely and firmly fitted; at the same time, the U-shaped plate is continuously reset and re-positioned to the inclined surface of the telescopic end of the telescopic ladder block by the elastic force of the spring, so as to prevent the telescopic ladder block from popping out during non-working hours and delaying subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the present invention as a whole; Figure 2 It is a schematic diagram of a partial structural cross-section of the present invention; Figure 3 It is a schematic diagram of the surrounding structure of the soft capsule of the present invention; Figure 4 It is a schematic diagram of the internal structure of the soft capsule of the present invention; Figure 5 It is a schematic diagram of the observation device of the present invention; Figure 6 It is a schematic diagram of the anti-gap device of the present invention; Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure in the middle.

[0018] In the figure: 1. device body; 2. workbench; 21. limit plate; 3. electric hydraulic slide rail; 31. welding assembly; 32. inclined rod; 4. observation device; 41. telescopic rod; 42. connecting rod; 43. arc plate; 44. telescopic angle plate; 45. L-shaped rod; 46. mirror plate; 47. fixed plate; 48. round rod; 5. anti-gap device; 51. slide seat; 52. U-shaped plate; 53. telescopic ladder block; 54. seven-shaped plate; 55. power plate; 56. hinge plate; 57. reset plate; 6. L-shaped plate; 7. vertical plate; 8. arc plate; 9. soft capsule; 10. reciprocating screw; 11. sliding ring; 12. push rod; 13. telescopic column; 14. blade plate. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] See also Figure 1-Figure 7 An embodiment of the present invention is: a welding device for a lower arm assembly of an automobile, comprising a device body 1, supporting legs are fixedly installed at the four corners of the bottom of the device body 1, a workbench 2 is arranged at the center of the top of the device body 1, two limit plates 21 are arranged on the top of the device body 1, and the two limit plates 21 are located at the periphery of the workbench 2, electric hydraulic slide rails 3 are arranged on the left and right sides of the top of the device body 1, and a welding assembly 31 is arranged inside the electric hydraulic slide rail 3, an outer wall of the telescopic end of the electric hydraulic slide rail 3 close to the workbench 2 is hinged with an inclined rod 32, an L-shaped plate 6 is hinged at the bottom of the inclined rod 32, a vertical plate 7 is hinged on the right side of the L-shaped plate 6, an arc plate 8 is hinged on the right side of the vertical plate 7, a soft capsule 9 is fixedly installed on the arc plate 8 close to the center of the workbench 2, and the welding assembly 31 slides back and forth inside the electric hydraulic slide rail 3 to realize welding; at the same time, the arc plate 8 provides limit stability for the soft capsule 9, and the above cooperation can make it possible to quickly clamp the irregular outer wall workpiece to ensure the welding stability of the workpiece and simplify the welding process.

[0021] The bottom of the L-shaped plate 6 contacts the top of the device body 1, and the limit plate 21 is located on the arc motion trajectory of the outer wall of the arc plate 8 close to the center of the workbench 2, and the concave surface of the arc plate 8 contacts the arc surface of the workbench 2. The arc plate 8 has toughness, and the soft capsule 9 is a arc capsule. An observation device 4 is provided inside the soft capsule 9 to facilitate the staff to monitor the weld.

[0022] A reciprocating screw 10 is rotatably installed at the bottom of the inner wall of the capsule 9, and a sliding ring 11 is sleeved and slidably installed on the outer wall of the reciprocating screw 10. A push rod 12 is hinged on the outer wall of the sliding ring 11 and the inner wall of the soft capsule 9 near the center of the workbench 2. A telescopic column 13 is fixedly installed at the top edge of the sliding ring 11. The telescopic end of the telescopic column 13 passes through the top of the soft capsule 9, and a spring is built into the telescopic column 13. A blade plate 14 is fixedly installed on the top of the telescopic end of the telescopic column 13. Through the above cooperation, the blade plate 14 is automatically changed in descending height through the deformation amplitude of the soft capsule 9 to cope with the clamping stability of workpieces of different diameters. At the same time, the blade plate 14 applies downward pressure to the workpiece, which secondary improves the welding stability and reduces fluctuations.

[0023] When in use, when welding two lower swing arm workpieces, one lower swing arm workpiece is placed on the top of the workbench 2, and the other lower swing arm workpiece is manually connected to the welding position by the staff. At this time, the electric hydraulic slide 3 is started, and the telescopic end of the electric hydraulic slide 3 drives the welding assembly 31 to descend to the specified welding height to weld the workpieces. At the same time, the welding assembly 31 slides back and forth inside the electric hydraulic slide 3 to realize the welding work; when the electric hydraulic slide 3 descends, it drives the inclined rod 32 to move synchronously, and the inclined rod 32 causes its own hinge point to start rotating through the resistance force of the L-shaped plate 6, and the inclined rod 32 pushes the L-shaped plate 6 to move in the direction close to the workbench 2, and the L-shaped plate 6 pushes the vertical plate 7 to move synchronously, and the vertical plate 7 drives the arc plate 8 to move synchronously, and the arc plate 8 guides the arc plate 8 through the limit plate 21. At this time, the arc plate 8 uses its own toughness and the guidance of the limit plate 21 to make its own concave surface slide close to the outer wall of the workbench 2, and the arc plate 8 drives the soft capsule 9 synchronously Movement, the soft capsule 9 is deformed by contact with the workpiece, and the arc plate 8 provides limit stability for the trapezoid of the soft capsule 9. Through the above cooperation, the irregular outer wall workpiece can be quickly clamped to ensure the welding stability of the workpiece, simplifying the welding process; the soft capsule 9 is deformed by the resistance between it and the workpiece, and the soft capsule 9 drives the push rod 12 to move synchronously, and the push rod 12 drives the sliding ring 11 to slide downward along the outer wall of the reciprocating screw rod 10. When the soft capsule 9 is subsequently reset, the push rod 12 pulls the sliding ring 11 to reset, and the sliding ring 11 drives the telescopic column 13 to move downward, and the telescopic end of the telescopic column 13 drives the blade plate 14 to move synchronously. At the same time, when the bottom of the blade plate 14 contacts the workpiece, it continues to descend through the telescopic end of the telescopic column 13. Through the above cooperation, the blade plate 14 is prompted to automatically change the descending height through the deformation amplitude of the soft capsule 9 to cope with the clamping stability of workpieces of different diameters. At the same time, the blade plate 14 applies downward pressure to the workpiece, which further improves the welding stability.

[0024] See also Figure 1-Figure 7 , based on the above embodiment, another embodiment of the present invention further includes an observation device 4; The observation device 4 includes a telescopic rod 41, a connecting rod 42, an arc-shaped piece 43 and a telescopic angle plate 44. The top of the telescopic rod 41 is fixedly installed at the bottom edge of the sliding ring 11. The end of the connecting rod 42 close to the reciprocating screw rod 10 is hinged to the outer wall of the telescopic end of the telescopic rod 41. The concave surface of the arc-shaped piece 43 is hinged to the back of the telescopic end of the connecting rod 42, and the arc surface of the arc-shaped piece 43 fits with the concave surface of the soft capsule 9. The bottom of the telescopic angle plate 44 is fixedly installed at the bottom angle of the inner wall of the soft capsule 9, and the top of the telescopic end of the telescopic angle plate 44 contacts the bottom of the arc-shaped piece 43. An anti-gap device 5 is provided under the telescopic rod 41 to prevent a gap from existing between the workpiece and the soft capsule 9 after the workpiece is fixed. Through the above cooperation, the arc-shaped piece 43 is closely attached to the concave surface of the soft capsule 9 during the deformation of the soft capsule 9. At the same time, the telescopic angle plate 44 supports the angles on both sides of the soft capsule 9, so that only the contact surface of the soft capsule 9 with the workpiece is deformed, and the rest of the parts remain in their original state, effectively avoiding the existence of an exposed suspended area between the workpiece and the soft capsule 9, and ensuring that the fixed workpiece will not be affected when the welding position is adjusted by holding the workpiece.

[0025] The observation device 4 also includes an L-shaped rod 45 and a mirror panel 46. The L-shaped rod 45 is fixedly installed on the inner wall of the telescopic end of the telescopic angle plate 44 away from the center of the soft capsule 9, and the top of the L-shaped rod 45 passes through the top of the soft capsule 9, and the bottom of the mirror panel 46 is hinged to the top of the L-shaped rod 45.

[0026] The observation device 4 also includes a fixed plate 47 and a round rod 48. The bottom of the fixed plate 47 is fixedly installed at the top edge of the soft capsule 9, and the round rod 48 is rotatably installed on the vertical surface of the inner wall of the fixed plate 47 away from the center of the soft capsule 9, and the round rod 48 is fixedly installed on the outer wall of the mirror plate 46 near the center of the soft capsule 9. Through the above cooperation, the welder holding the workpiece can observe the weld between the two workpieces through the refraction of the mirror plate 46, which is convenient for the staff to adjust the welding angle or strength in time to ensure the welding quality.

[0027] When in use, the sliding ring 11 drives the telescopic rod 41 to move synchronously when it descends, and the telescopic end of the telescopic rod 41 drives the connecting rod 42 to move synchronously, and the telescopic end of the connecting rod 42 drives the arc piece 43 to slide synchronously along the concave surface of the soft capsule 9. When the soft capsule 9 is deformed, it contacts the arc piece 43. The arc piece 43 contracts through the telescopic end of the connecting rod 42 to avoid blocking the deformation of the soft capsule 9. At the same time, when the arc piece 43 descends, it squeezes the telescopic end of the telescopic angle plate 44 to move downward synchronously. At this time, the arc piece 43 applies downward pressure to the telescopic angle plate 44. Through the above cooperation, the arc piece 43 is tightly attached to the concave surface of the soft capsule 9 during the deformation of the soft capsule 9. At the same time, the telescopic angle plate 44 supports the angles on both sides of the soft capsule 9, so that only the contact surface of the soft capsule 9 with the workpiece is deformed, and the rest of the parts remain in their original state, which is effective. Avoid the presence of exposed suspended area between the workpiece and the soft capsule 9, and ensure that the fixed workpiece will not be affected when the welding position is adjusted by the hand-held workpiece; when the telescopic end of the telescopic angle plate 44 moves downward through the pressure of the arc-shaped piece 43, it will pull the L-shaped rod 45 to move synchronously, and the L-shaped rod 45 pulls the hinge axis at the bottom of the mirror plate 46. At this time, the hinge axis of the mirror plate 46 generates a rotational force and starts to rotate, and the mirror plate 46 drives the round rod 48 to rotate along the vertical surface of the fixed plate 47. The fixed plate 47 limits the round rod 48 and the mirror plate 46. At this time, the mirror plate 46 rotates and moves in the vertical direction. Through the above cooperation, the welder holding the workpiece can observe the weld between the two workpieces through the refraction of the mirror plate 46, which is convenient for the staff to adjust the welding angle or strength in time to ensure the welding quality.

[0028] See also Figure 1-Figure 7 , based on the above embodiment, another embodiment of the present invention further includes an anti-gap device 5; The anti-gap device 5 includes a slide seat 51, a U-shaped plate 52, a telescopic ladder block 53 and two seven-shaped plates 54. The bottom of the slide seat 51 is fixedly installed on the bottom of the inner wall of the soft capsule 9, and a slide groove is opened at the bottom of the slide seat 51. The U-shaped plate 52 is slidably installed inside the slide seat 51 on the side away from the telescopic rod 41 through a spring, and the U-shaped plate 52 is short at the top and long at the bottom. The bottom of the telescopic ladder block 53 is slidably installed on the bottom of the inner wall of the U-shaped plate 52. The two seven-shaped plates 54 are fixedly installed on the vertical surface of the outer wall of the telescopic ladder block 53 near the center of the soft capsule 9, and the seven-shaped plates 54 are slidably installed on the outer wall of the slide seat 51 at one end away from the center of the U-shaped plate 52. Through the above cooperation, after the soft capsule 9 and the workpiece are positioned, the arc-shaped sheet 43 is used to perform secondary bonding on the gap generated when the soft capsule 9 is slightly deformed due to changes in the external temperature of the soft capsule 9, so that the soft capsule 9 and the workpiece are always tightly and firmly fitted.

[0029] The anti-gap device 5 also includes a power plate 55, a hinge plate 56 and a reset plate 57. The top of the power plate 55 is fixedly installed on the outer wall of the telescopic rod 41 near the outer wall of the reciprocating screw 10, and the bottom of the power plate 55 is slidably installed on the top of the U-shaped plate 52. The reset plate 57 is fixedly installed inside the slide groove of the slide seat 51 away from the center of the soft capsule 9. The U-shaped plate 52 is continuously reset by the spring force and re-positioned to the inclined surface of the telescopic end of the telescopic ladder block 53 to prevent the telescopic ladder block 53 from popping out during non-working hours and delaying future use.

[0030] When the U-shaped plate 52 continues to slide to the slide groove of the slide seat 51, the U-shaped plate 52 is instantly stuck in the slide groove of the slide seat 51 through the elastic tension between its own spring and the slide seat 51. At this time, the U-shaped plate 52 no longer resists the inclined surface of the telescopic end of the telescopic ladder block 53, and the telescopic end of the telescopic ladder block 53 is released from the continuous power storage state and moves upward quickly. At this time, the telescopic end of the telescopic ladder block 53 pushes the side of the telescopic end of the telescopic rod 41 to retract upward, and during the release of the spring elastic force inside the telescopic ladder block 53, the telescopic end of the telescopic rod 41 is reciprocated to move up and down. The telescopic end of the telescopic rod 41 drives the connecting rod 42 to move synchronously. The arc piece 43 slides synchronously along the concave surface of the soft capsule 9. Through the above cooperation, the soft capsule 9 and the workpiece are locked. The arc piece 43 is used to perform secondary fitting of the gap caused by the slight deformation of the soft capsule 9 due to the change of external temperature, so that the soft capsule 9 and the workpiece are always tightly fitted and stable; after the elastic force of the telescopic end of the telescopic ladder block 53 is released, the hinge plate 56 starts to rotate through the torsion of the torsion spring and the telescopic end of the telescopic ladder block 53 is always lower than the telescopic end of the telescopic rod 41, so that the hinge plate 56 can press the telescopic end of the telescopic ladder block 53 to restore the initial power storage state when it rotates. At the same time, after the processing is completed, the power plate 55 is reset by the telescopic rod 41, and the power plate 55 no longer presses the top of the U-shaped plate 52. At this time, the U-shaped plate 52 is elastically pushed out of the slide groove by the reset plate 57 to reset to the inner wall of the slide seat 51, and the U-shaped plate 52 is continuously reset by the spring elastic force and re-positioned to the inclined surface of the telescopic end of the telescopic ladder block 53, so as to avoid the telescopic ladder block 53 popping out during non-working hours and delaying future use.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A welding device for a lower arm assembly of an automobile, comprising a device body (1), wherein support legs are fixedly installed at the four corners of the bottom of the device body (1), a workbench (2) is arranged at the center of the top of the device body (1), two limit plates (21) are arranged on the top of the device body (1), and the two limit plates (21) are located on the periphery of the workbench (2), an electric hydraulic slide rail (3) is arranged on the left and right sides of the top of the device body (1), a welding assembly (31) is arranged inside the electric hydraulic slide rail (3), and an outer wall of the telescopic end of the electric hydraulic slide rail (3) close to the workbench (2) is hinged with an inclined rod (32), characterized in that: An L-shaped plate (6) is hingedly connected to the bottom of the inclined rod (32), a vertical plate (7) is hingedly connected to the right side of the L-shaped plate (6), an arc-shaped plate (8) is hingedly connected to the right side of the vertical plate (7), and a soft capsule (9) is fixedly mounted on one side of the arc-shaped plate (8) close to the center of the workbench (2).

2. The welding device for the lower arm assembly of an automobile according to claim 1, characterized in that: The bottom of the L-shaped plate (6) contacts the top of the device body (1); the side of the limit plate (21) close to the center of the workbench (2) is located on the arc surface movement trajectory of the outer wall of the arc plate (8); and the concave surface of the arc plate (8) contacts the arc surface of the workbench (2); the arc plate (8) has toughness; the soft capsule (9) is a arc surface capsule; and an observation device (4) is arranged inside the soft capsule (9) for facilitating workers to monitor the weld.

3. The welding device for the lower arm assembly of an automobile according to claim 2, characterized in that: A reciprocating screw (10) is rotatably mounted on the bottom of the inner wall of the soft capsule (9); a sliding ring (11) is sleeved and slidably mounted on the outer wall of the reciprocating screw (10); a push rod (12) is hingedly connected between the outer wall of the sliding ring (11) and the inner wall of the soft capsule (9) near the center of the workbench (2); a telescopic column (13) is fixedly mounted on the top edge of the sliding ring (11); the telescopic end of the telescopic column (13) passes through the top of the soft capsule (9); a spring is built into the telescopic column (13); and a blade plate (14) is fixedly mounted on the top of the telescopic end of the telescopic column (13).

4. The welding device for the lower arm assembly of an automobile according to claim 3, characterized in that: The observation device (4) comprises a telescopic rod (41), a connecting rod (42), an arc-shaped piece (43) and a telescopic angle plate (44); the top of the telescopic rod (41) is fixedly mounted at the bottom edge of the sliding ring (11); one end of the connecting rod (42) close to the reciprocating screw rod (10) is hinged to the outer wall of the telescopic end of the telescopic rod (41); the concave surface of the arc-shaped piece (43) is hinged to the back surface of the telescopic end of the connecting rod (42); the arc-shaped piece (43) is matched with the concave surface of the soft capsule (9); the bottom of the telescopic angle plate (44) is fixedly mounted at the bottom angle of the inner wall of the soft capsule (9); the top of the telescopic end of the telescopic angle plate (44) is in contact with the bottom of the arc-shaped piece (43); and an anti-gap device (5) is provided below the telescopic rod (41) for preventing a gap from existing between the workpiece and the soft capsule (9) after the workpiece is fixed.

5. The welding device for the lower arm assembly of an automobile according to claim 4, characterized in that: The observation device (4) further comprises an L-shaped rod (45) and a mirror plate (46); the L-shaped rod (45) is fixedly mounted on the inner wall of the telescopic end of the telescopic angle plate (44) at a side away from the center of the soft capsule (9); the top of the L-shaped rod (45) passes through the top of the soft capsule (9); and the bottom of the mirror plate (46) is hinged to the top of the L-shaped rod (45).

6. The welding device for the lower arm assembly of an automobile according to claim 5, characterized in that: The observation device (4) further comprises a fixing plate (47) and a round rod (48), wherein the bottom of the fixing plate (47) is fixedly mounted on the top edge of the soft capsule (9), the round rod (48) is rotatably mounted on the vertical surface of the inner wall of the fixing plate (47) on the side away from the center of the soft capsule (9), and the round rod (48) is fixedly mounted on the outer wall of the mirror plate (46) on the side close to the center of the soft capsule (9).

7. The welding device for a lower swing arm assembly of an automobile according to claim 6, characterized in that: The anti-gap device (5) comprises a slide seat (51), a U-shaped plate (52), a telescopic ladder block (53) and two seven-shaped plates (54). The bottom of the slide seat (51) is fixedly mounted on the bottom of the inner wall of the soft capsule (9), and a slide groove is provided at the bottom of the slide seat (51). The side of the U-shaped plate (52) away from the telescopic rod (41) is slidably mounted inside the slide seat (51) through a spring, and the U-shaped plate (52) is shorter at the top and longer at the bottom. The bottom of the telescopic ladder block (53) is slidably mounted on the bottom of the inner wall of the U-shaped plate (52). The two seven-shaped plates (54) are fixedly mounted on the vertical surface of the outer wall of the telescopic ladder block (53) on the side close to the center of the soft capsule (9), and the end of the seven-shaped plate (54) away from the center of the U-shaped plate (52) is slidably mounted on the outer wall of the slide seat (51).

8. The welding device for the lower arm assembly of an automobile according to claim 7, characterized in that: The anti-gap device (5) further comprises a power plate (55), a hinge plate (56) and a reset plate (57); the top of the power plate (55) is fixedly mounted on the outer wall of the telescopic rod (41) on one side close to the outer wall of the reciprocating screw rod (10); the bottom of the power plate (55) is slidably mounted on the top of the U-shaped plate (52); and the reset plate (57) is fixedly mounted inside the slide groove of the slide seat (51) on one side away from the center of the soft capsule (9).

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