An automatic welding device for a breakdown truck body production line

Abstract

The present invention relates to the technical field of body panel welding equipment, and discloses an automatic welding equipment for a wrecker body production line, including a welding platform. A positioning mechanism for positioning the body panel and the square steel and a pressing mechanism for pressing the body panel and the square steel are provided on the welding platform. The positioning mechanism includes an adjustment mechanism for adjusting the horizontal and vertical positions of the body panel and the square steel and a limiting mechanism for horizontally and vertically limiting the body panel and the square steel. The present invention can automatically position and press the body panel and the square steel to be welded, without manual operation, and has the advantages of low manual labor intensity, high working efficiency, and high positioning accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of body panel welding equipment, and particularly relates to an automatic welding equipment for a wrecker body production line. Background Art

[0002] The full name of a wrecker is a road wrecker, also known as a tow truck, a road rescue vehicle, or a towing vehicle, which has multiple functions such as lifting, pulling, and towing. Wreckers are mainly used for road breakdown vehicles, urban illegal vehicles, and emergency rescue, etc. When welding the body of a wrecker, generally, the body floor of the wrecker and the square steel are first spliced according to the dimensions, then placed on the welding platform, and finally, the welding robot is started to automatically weld the connection between the body floor and the square steel. Since the welding robot has relatively high precision requirements for the welding position, the body floor and the square steel need to be positioned and clamped after being placed on the welding platform to ensure the welding precision.

[0003] In the prior art, generally, positioning blocks and pressing plates are arranged on the welding platform, and then the positions of the body floor and the square steel are manually adjusted, and then the pressing plates are used to clamp each side of the body floor and the square steel in turn. Since the body floor and the square steel of the wrecker are generally relatively large in size, the welding size is long, the number of welds is large, and the welding quality requirements for the welds are high. Manual positioning is not only time-consuming and laborious, but also has low precision and poor effect. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic welding equipment for a wrecker body production line, which can automatically position and press the body panel and the square steel to be welded, without manual operation, and has the advantages of small manual labor intensity, high working efficiency, and high positioning precision.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions:

[0006] An automatic welding equipment for a wrecker body production line includes a welding platform, on which a positioning mechanism for positioning the body panel and the square steel and a pressing mechanism for pressing the body panel and the square steel are provided. The positioning mechanism includes an adjustment mechanism for horizontally and vertically adjusting the body panel and the square steel and a limiting mechanism for horizontally and vertically limiting the body panel and the square steel.

[0007] By adopting the above technical solution, the body sheet to be welded is placed on the welding platform at the position between the adjustment mechanism and the limiting mechanism by a gantry crane. Then, the square steel to be welded is respectively placed around the body sheet. Then, the adjustment mechanism is used to adjust the lateral position and longitudinal position of the body sheet and the square steel respectively, so that the lateral side and the longitudinal side of the body sheet respectively press the square steel against the limiting mechanism, thereby realizing the lateral and longitudinal positioning of the body sheet and the square steel. At the same time, during the positioning process, the pressing mechanism gradually presses the square steel on each side of the body sheet, effectively ensuring the stability of the welding part during welding, thus effectively improving the welding quality. Moreover, the whole process is automatic and does not require manual operation, greatly reducing the workload of people.

[0008] The further setting of the present invention is: the adjustment mechanism includes a lateral adjustment plate for adjusting the position of the lateral side of the body sheet. The lateral adjustment plate is parallel to the lateral side of the body sheet. A driving cylinder is provided on the side of the lateral adjustment plate away from the welding center. The driving cylinder is fixed on the welding platform, and the telescopic shaft of the driving cylinder is fixedly connected to the lateral adjustment plate.

[0009] By adopting the above technical solution, the driving cylinder is used to drive the lateral adjustment plate to push the body sheet and the square steel from the lateral side of the body sheet to move towards the side close to the limiting mechanism, thereby realizing the adjustment of the lateral position of the body sheet.

[0010] The further setting of the present invention is: the adjustment mechanism further includes a longitudinal adjustment plate for adjusting the position of the longitudinal side of the body sheet. The longitudinal adjustment plate is in an "L" shape. The horizontal section of the longitudinal adjustment plate is parallel to the lateral adjustment plate, and the vertical section of the longitudinal adjustment plate is parallel to the longitudinal side of the body sheet. A guide post is provided at one end of the horizontal section of the longitudinal adjustment plate. The guide post is slidably matched with a guide plate fixed on the lateral adjustment plate. A first spring is sleeved between one end of the guide post and the guide plate. One end of the first spring is fixed to the end of the guide post, and the other end of the first spring is fixed to the guide plate. A through inclined hole is further provided on the horizontal section of the longitudinal adjustment plate. A driving pin is provided on the side of the inclined hole away from the lateral adjustment plate. The driving pin is slidably matched with the inclined hole. The end of the driving pin away from the inclined hole is fixed on the welding platform. A horizontal chute is provided on the side of the lateral adjustment plate close to the welding center. The horizontal chute is located on one side of the inclined hole.

[0011] By adopting the above technical solution, when the driving cylinder drives the lateral adjusting plate to move from one lateral side of the vehicle body plate, the lateral adjusting plate will push the longitudinal adjusting plate to move laterally synchronously. When the longitudinal adjusting plate moves laterally with the lateral adjusting plate, the inclined holes in the horizontal section of the longitudinal adjusting plate continuously slide relative to the driving pins fixed on the welding platform, so that the longitudinal adjusting plate continuously moves in the direction close to the longitudinal side of the vehicle body plate under the action of the driving pins. During the process of the longitudinal adjusting plate moving in the direction close to the longitudinal side of the vehicle body plate, it continuously squeezes the square steel longitudinally and pushes the vehicle body plate to move longitudinally, realizing the adjustment of the longitudinal position of the vehicle body plate. By using the lateral movement of the lateral adjusting plate to drive the longitudinal adjusting plate to move longitudinally synchronously, the synchronous position adjustment of the vehicle body plate in the lateral and longitudinal directions is realized, thus realizing the synchronous automatic positioning of the lateral and longitudinal positions of the vehicle body plate. The structure is simple and the positioning efficiency is high.

[0012] The further setting of the present invention is that: the limiting mechanism includes a lateral limiting plate and a longitudinal limiting plate. The lateral limiting plate is parallel to the lateral adjusting plate, the longitudinal limiting plate is parallel to the vertical section of the longitudinal adjusting plate. The lateral limiting plate and the lateral adjusting plate are respectively opposite to the two lateral sides of the vehicle body plate, and the longitudinal limiting plate and the vertical section of the longitudinal adjusting plate are respectively opposite to the two longitudinal sides of the vehicle body plate.

[0013] By adopting the above technical solution, the limiting mechanism limits the vehicle body plate from the opposite side of the lateral adjusting plate and the longitudinal adjusting plate through the lateral limiting plate and the longitudinal limiting plate respectively, thus realizing the positioning of the vehicle body plate, ensuring that the welding position of the vehicle body plate is always constant during the continuous production process, and effectively ensuring the welding accuracy of the vehicle body plate.

[0014] The further setting of the present invention is that: the pressing mechanism includes a plurality of pressing units, and each pressing unit is respectively installed on the lateral adjusting plate, the longitudinal adjusting plate, the lateral limiting plate and the longitudinal limiting plate.

[0015] By adopting the above technical solution, each pressing unit is respectively installed on the lateral adjusting plate, the longitudinal adjusting plate, the lateral limiting plate and the longitudinal limiting plate, so that each pressing unit can longitudinally press each side of the vehicle body plate and the square steel at the same time. During the pressing process, each side is stressed and pressed at the same time, which can effectively ensure the straightness of each side of the vehicle body plate and the square steel and the flatness of the entire surface of the vehicle body plate, thus further improving the welding quality of the vehicle body plate.

[0016] A further arrangement of the present invention is as follows: Each pressing unit includes a pressing arm and a driving arm that are parallel to each other. The middle of the pressing arm is rotatably connected to the mounting seat through a rotating shaft. The mounting seat is fixed on the transverse adjustment plate (or longitudinal adjustment plate or transverse limiting plate or longitudinal limiting plate). The driving arm penetrates through the transverse adjustment plate (or longitudinal adjustment plate or transverse limiting plate or longitudinal limiting plate) and extends out from the transverse adjustment plate (or longitudinal adjustment plate or transverse limiting plate or longitudinal limiting plate). The driving arm is slidably matched with the transverse adjustment plate (or longitudinal adjustment plate or transverse limiting plate or longitudinal limiting plate). A wedge block for driving the pressing wall to rotate around the rotating shaft is provided at one end of the driving arm away from the welding center. A second spring is sleeved on the driving arm at the position between the wedge block and the transverse adjustment plate (or longitudinal adjustment plate or transverse limiting plate or longitudinal limiting plate). One end of the second spring is fixed on the wedge block, and the other end of the second spring is fixed on the transverse adjustment plate (or longitudinal adjustment plate or transverse limiting plate or longitudinal limiting plate). An extension part extending downward is provided at one end of the pressing arm away from the welding center. The extension part abuts against the wedge surface of the wedge block.

[0017] By adopting the above technical solution, during the process of positioning the vehicle body plate and the corresponding square steel by pushing the vehicle body plate and the corresponding square steel to move from the transverse and longitudinal sides of the vehicle body plate by the transverse adjustment plate and the longitudinal adjustment plate respectively, the transverse adjustment plate and the longitudinal adjustment plate respectively apply force to the vehicle body plate and the corresponding square steel through the end of the driving arm close to the vehicle body plate in each pressing unit installed on the transverse adjustment plate and the longitudinal adjustment plate. During this process, the reaction force received by the driving arm from the vehicle body plate and the square steel is balanced with the elastic force of the second spring received by the driving arm until the vehicle body plate and the square steel move to the other transverse side and the other longitudinal side respectively and abut against the end of the driving arm close to the vehicle body plate in the pressing unit on the transverse limiting plate and the longitudinal limiting plate until the reaction force received by each driving arm is greater than the elastic force of the second spring. At this time, the end of the driving arm in contact with the vehicle body plate and the square steel moves to the side away from the vehicle body plate, so that the wedge block at the other end of the driving arm moves to the side away from the vehicle body plate. During the movement of the wedge block, its wedge surface drives the extension part on the pressing arm to move upward, and the end of the pressing arm close to the vehicle body plate moves downward until the vehicle body plate or the square steel is pressed tightly, thus realizing the pressing and fixing of the vehicle body plate and the square steel. When the welding is completed during the welding process, the driving cylinder drives the transverse adjustment plate and the longitudinal adjustment plate to move in the reverse direction. Each driving arm moves in the reverse direction under the restoring force of the second spring, so that the wedge block at the other end of the driving arm moves to the side close to the vehicle body plate, and the extension parts of each pressing arm move downward under the action of gravity, so that the end of each pressing arm pressing the vehicle body plate or the square steel moves upward, thus releasing the vehicle body plate or the square steel, which is convenient for unloading the welded vehicle body plate. During the whole process of pressing and releasing, no additional power is required, which is not only simple in structure, but also low in equipment cost and high in working efficiency.

[0018] A further setting of the present invention is: it further includes a gantry located above the welding platform. Both sides of the gantry reciprocate along the rails parallel to the length direction of the welding platform on the ground on both sides of the welding platform through walking wheels. A transverse slide rail parallel to the width direction of the welding platform and a transverse slider slidably engaged with the transverse slide rail are provided on the gantry. The transverse slider is threadedly connected to a transverse lead screw parallel to the transverse slide rail. One end of the transverse lead screw is connected to a driving motor. A robotic welder is fixedly provided at the bottom of the transverse slider.

[0019] By adopting the above technical solution, the gantry reciprocates along the rails through the walking wheels, thereby driving the robotic welder installed on the gantry to continuously weld one side of the length of the vehicle body panel. The transverse slide rail on the gantry and the transverse slider slidably engaged with the transverse slide rail are used to drive the robotic welder to reciprocate along the width direction of the vehicle body panel, so as to realize continuous welding of one side of the width of the vehicle body panel. By welding one side of the length and one side of the width of the vehicle body panel respectively, it is possible to realize welding operation on the four sides of the vehicle body panel only by positioning in sequence.

[0020] A further setting of the present invention is: the welding platform includes a support plate for supporting the vehicle body panel. A plurality of rolling mechanisms are evenly distributed on the support plate. The rolling mechanism includes a sphere. The sphere is embedded in a spherical hole on the support plate. The sphere can rotate 360° along the spherical hole. The highest point of the sphere is higher than the upper surface of the support plate.

[0021] By adopting the above technical solution, the welding platform supports the vehicle body panel through the rolling mechanism. At the same time, when the position of the vehicle body panel is adjusted, the rolling mechanism uses the rotation of the sphere to assist the vehicle body panel to move at any angle. This not only greatly reduces the friction between the bottom surface of the vehicle body panel and the welding platform, avoids the problem of poor appearance quality caused by wear of the bottom surface of the vehicle body panel, but also can effectively reduce the driving force when the vehicle body panel moves, saving time and effort.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention adjusts the transverse position and longitudinal position of the vehicle body panel and the square steel respectively through the adjustment mechanism, so that one side of the transverse and one side of the longitudinal of the vehicle body panel press the square steel against the limiting mechanism respectively, thereby realizing the transverse and longitudinal positioning of the vehicle body panel and the square steel. At the same time, during the positioning process, the pressing mechanism gradually presses the square steel on each side of the vehicle body panel, effectively ensuring the stability of the welding part during welding, thereby effectively improving the welding quality. Moreover, the whole process is automatic and does not require manual operation, greatly reducing the workload of people.

[0024] 2. In the present invention, the driving cylinder is used to drive the lateral adjusting plate to push the vehicle body plate and the square steel from one lateral side of the vehicle body plate towards the side close to the limiting mechanism, so as to realize the lateral position adjustment of the vehicle body plate. And when the driving cylinder drives the lateral adjusting plate to move from one lateral side of the vehicle body plate, the lateral adjusting plate will push the longitudinal adjusting plate to move laterally synchronously. When the longitudinal adjusting plate moves laterally with the lateral adjusting plate, the inclined holes in the horizontal section of the longitudinal adjusting plate continuously slide relative to the driving pins fixed on the welding platform, so that the longitudinal adjusting plate continuously moves towards the direction close to the longitudinal side of the vehicle body plate under the action of the driving pins. During the process of the longitudinal adjusting plate moving towards the direction close to the longitudinal side of the vehicle body plate, it continuously longitudinally presses the square steel and pushes the vehicle body plate to move longitudinally, realizing the longitudinal position adjustment of the vehicle body plate. By using the lateral movement of the lateral adjusting plate to drive the synchronous longitudinal movement of the longitudinal adjusting plate, the synchronous position adjustment of the vehicle body plate in the lateral and longitudinal directions is realized, thus realizing the synchronous automatic positioning of the vehicle body plate in the lateral and longitudinal positions. The structure is simple and the positioning efficiency is high.

[0025] 3. In the present invention, the pressing mechanism longitudinally presses each side of the vehicle body plate and the square steel simultaneously through a plurality of pressing units. During the pressing process, each side is stressed and pressed simultaneously, which can effectively ensure the straightness of each side of the vehicle body plate and the square steel and the flatness of the entire surface of the vehicle body plate, so as to further improve the welding quality of the vehicle body plate.

[0026] 4. In the present invention, the transverse adjustment plate and the longitudinal adjustment plate respectively push the body plate and the corresponding square steel from the transverse and longitudinal sides of the body plate to move to position the body plate and the square steel. In the process, the transverse adjustment plate and the longitudinal adjustment plate respectively apply force to the body plate and the corresponding square steel through the end of the driving arm in each clamping unit installed on the transverse adjustment plate and the longitudinal adjustment plate close to the body plate. In this process, the reaction force of the driving arm on the body plate and the square steel is balanced with the elastic force of the spring 2 applied to the driving arm, until the body plate and the square steel move to the other transverse side and the other longitudinal side thereof and respectively collide with the end of the driving arm in the clamping unit on the transverse limiting plate and the longitudinal limiting plate close to the body plate, until the reaction force applied to each driving arm is greater than the elastic force of the spring 2, at which time the end of the driving arm in contact with the body plate and the square steel moves to the side away from the body plate, thereby causing the other end of the driving arm to The wedge block at one end moves to the side away from the body plate. During the movement of the wedge block, its wedge surface drives the extension part on the pressure arm to move upward, and the end of the pressure arm close to the body plate moves downward until the body plate or square steel is pressed tightly, thereby achieving the pressing and fixing of the body plate and the square steel. When the welding is completed during the welding process, the driving cylinder drives the transverse adjustment plate and the longitudinal adjustment plate to move in the opposite direction, and each driving arm moves in the opposite direction under the restoring force of spring 2, so that the wedge block at the other end of the driving arm moves to the side close to the body plate, and the extension part of each pressure arm moves downward under the action of gravity, so that the end of each pressure arm pressing the body plate or square steel moves upward, thereby releasing the body plate or square steel, which is convenient for unloading the body plate after welding. During the entire pressing and loosening process, no additional power is required. Not only is the structure simple, but also the equipment cost is low and the work efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The utility model is a schematic diagram of the overall structure of an automatic welding device for a tow truck body production line of the present invention.

[0029] Figure 2 The invention discloses a structural schematic diagram of an adjustment mechanism in an automatic welding device for a tow truck body production line.

[0030] Figure 3 The present invention is a schematic structural diagram of a clamping mechanism in an automatic welding device for a tow truck body production line.

[0031] Figure 4It is a schematic cross-sectional structure diagram of a welding platform in an automatic welding device of a breakdown truck body production line according to the present invention.

[0032] Figure 5 It is a schematic connection structure diagram of a robot welder and a gantry in an automatic welding device of a breakdown truck body production line according to the present invention.

[0033] Figure 6 It is a schematic cross-sectional structure diagram of an adjusting mechanism after the lateral and longitudinal positioning of the body plate and square steel by an automatic welding device of a breakdown truck body production line according to the present invention.

[0034] Figure 7 It is a schematic cross-sectional structure diagram of an adjusting mechanism before the lateral and longitudinal positioning of the body plate and square steel by an automatic welding device of a breakdown truck body production line according to the present invention.

[0035] In the figure, 1. Welding platform; 2. Body plate; 3. Square steel; 4. Positioning mechanism; 41. Adjusting mechanism; 411. Lateral adjusting plate; 412. Driving cylinder; 413. Longitudinal adjusting plate; 414. Horizontal section; 415. Vertical section; 42. Limiting mechanism; 421. Lateral limiting plate; 422. Longitudinal limiting plate; 43. Guide post; 44. Guide plate; 45. Spring I; 46. Oblique hole; 47. Driving pin; 48. Horizontal sliding groove; 5. Pressing mechanism; 51. Pressing arm; 52. Driving arm; 53. Rotating shaft; 54. Mounting seat; 55. Wedge block; 56. Spring II; 57. Extension part; 6. Gantry; 7. Rail; 8. Lateral slide rail; 9. Lateral slider; 10. Lateral lead screw; 11. Driving motor; 12. Robot welder; 13. Support plate; 14. Rolling mechanism; 141. Sphere; 142. Spherical hole. Specific embodiments

[0036] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0037] As Figures 1 to 7 shown, an automatic welding device for a breakdown truck body production line includes a welding platform 1. A positioning mechanism 4 for positioning the body plate 2 and square steel 3 and a pressing mechanism 5 for pressing the body plate 2 and square steel 3 are provided on the welding platform 1. The positioning mechanism 4 includes an adjusting mechanism 41 for adjusting the lateral and longitudinal positions of the body plate 2 and square steel 3 and a limiting mechanism 42 for laterally and longitudinally limiting the body plate 2 and square steel 3.

[0038] Further, the adjustment mechanism 41 includes a lateral adjustment plate 411 for adjusting the position of one lateral side of the vehicle body panel 2. The lateral adjustment plate 411 is parallel to one lateral side of the vehicle body panel 2. A driving cylinder 412 is provided on the side of the lateral adjustment plate 411 away from the welding center. The driving cylinder 412 is fixed on the welding platform 1, and the telescopic shaft of the driving cylinder 412 is fixedly connected to the lateral adjustment plate 411.

[0039] Further, the adjustment mechanism 41 further includes a longitudinal adjustment plate 413 for adjusting the position of one longitudinal side of the vehicle body panel 2. The longitudinal adjustment plate 413 is in an "L" shape. The horizontal section 414 of the longitudinal adjustment plate 413 is parallel to the lateral adjustment plate 411, and the vertical section 415 of the longitudinal adjustment plate 413 is parallel to one longitudinal side of the vehicle body panel 2. A guide post 43 is provided at one end of the horizontal section 414 of the longitudinal adjustment plate 413. The guide post 43 is slidably engaged with a guide plate 44 fixed on the lateral adjustment plate 411. A first spring 45 is sleeved between one end of the guide post 43 and the guide plate 44. One end of the first spring 45 is fixed to the end of the guide post 43, and the other end of the first spring 45 is fixed to the guide plate 44. A through inclined hole 46 is further provided on the horizontal section 414 of the longitudinal adjustment plate 413. A driving pin 47 is provided on the side of the inclined hole 46 away from the lateral adjustment plate 411. The driving pin 47 is slidably engaged with the inclined hole 46. The end of the driving pin 47 away from the inclined hole 46 is fixed on the welding platform 1. A horizontal sliding groove 48 is provided on the side of the lateral adjustment plate 411 close to the welding center. The horizontal sliding groove 48 is located on one side of the inclined hole 46.

[0040] Further, the limiting mechanism 42 includes a lateral limiting plate 421 and a longitudinal limiting plate 422. The lateral limiting plate 421 is parallel to the lateral adjustment plate 411, and the longitudinal limiting plate 422 is parallel to the vertical section 415 of the longitudinal adjustment plate 413. The lateral limiting plate 421 and the lateral adjustment plate 411 are respectively opposite to the two lateral sides of the vehicle body panel 2, and the longitudinal limiting plate 422 and the vertical section 415 of the longitudinal adjustment plate 413 are respectively opposite to the two longitudinal sides of the vehicle body panel 2.

[0041] Further, the pressing mechanism 5 includes a plurality of pressing units, and each pressing unit is respectively installed on the lateral adjustment plate 411, the longitudinal adjustment plate 413, the lateral limiting plate 421, and the longitudinal limiting plate 422.

[0042] Furthermore, each pressing unit includes a pressing arm 51 and a driving arm 52 that are parallel to each other. The middle of the pressing arm 51 is rotatably connected to the mounting seat 54 through a rotating shaft 53. The mounting seat 54 is fixed on the transverse adjustment plate 411 (or the longitudinal adjustment plate 413 or the transverse limiting plate 421 or the longitudinal limiting plate 422). The driving arm 52 penetrates through the transverse adjustment plate 411 (or the longitudinal adjustment plate 413 or the transverse limiting plate 421 or the longitudinal limiting plate 422) and extends out from the transverse adjustment plate 411 (or the longitudinal adjustment plate 413 or the transverse limiting plate 421 or the longitudinal limiting plate 422). The driving arm 52 is slidably matched with the transverse adjustment plate 411 (or the longitudinal adjustment plate 413 or the transverse limiting plate 421 or the longitudinal limiting plate 422). A wedge-shaped block 55 for driving the pressing wall to rotate around the rotating shaft 53 is provided at one end of the driving arm 52 away from the welding center. A second spring 56 is sleeved on the driving arm 52 at a position between the wedge-shaped block 55 and the transverse adjustment plate 411 (or the longitudinal adjustment plate 413 or the transverse limiting plate 421 or the longitudinal limiting plate 422). One end of the second spring 56 is fixed on the wedge-shaped block 55, and the other end of the second spring 56 is fixed on the transverse adjustment plate 411 (or the longitudinal adjustment plate 413 or the transverse limiting plate 421 or the longitudinal limiting plate 422). An extension portion 57 extending downward is provided at one end of the pressing arm 51 away from the welding center. The extension portion 57 abuts against the wedge surface of the wedge-shaped block 55.

[0043] Furthermore, it further includes a gantry 6 located above the welding platform 1. Both sides of the gantry 6 reciprocate along the rails 7 parallel to the length direction of the welding platform 1 on the ground on both sides of the welding platform 1 through traveling wheels. A transverse slide rail 8 parallel to the width direction of the welding platform 1 and a transverse slider 9 slidably matched with the transverse slide rail 8 are provided on the gantry 6. The transverse slider 9 is threadedly connected to a transverse lead screw 10 parallel to the transverse slide rail 8. One end of the transverse lead screw 10 is connected to a driving motor 11. A robotic welder 12 is fixedly provided at the bottom of the transverse slider 9.

[0044] Furthermore, the welding platform 1 includes a support plate 13 for supporting the vehicle body plate 2. A plurality of rolling mechanisms 14 are evenly distributed on the support plate 13. The rolling mechanism 14 includes a sphere 141. The sphere 141 is embedded in a spherical hole 142 on the support plate 13. The sphere 141 can rotate 360° along the spherical hole 142. The highest point of the sphere 141 is higher than the upper surface of the support plate 13.

[0045] Working principle of the present invention: Before welding, first use a gantry crane to place the body panel 2 to be welded at a position between the adjustment mechanism 41 and the limit mechanism 42 on the welding platform 1. Then, place the square steel 3 to be welded around the body panel 2 respectively. Then, start the driving cylinder 412 to drive the transverse adjustment plate 411 to push the body panel 2 and the square steel 3 from the transverse side of the body panel 2 to move towards the side close to the limit mechanism 42. At the same time, when the driving cylinder 412 drives the transverse adjustment plate 411 to move from the transverse side of the body panel 2, the transverse adjustment plate 411 will push the longitudinal adjustment plate 413 to move horizontally synchronously. When the longitudinal adjustment plate 413 moves horizontally with the transverse adjustment plate 411, the inclined holes 46 in the horizontal section of the longitudinal adjustment plate 413 continuously slide relative to the driving pins 47 fixed on the welding platform 1, so that the longitudinal adjustment plate 413 continuously moves towards the longitudinal side of the body panel 2 under the action of the driving pins 47. During the process of the longitudinal adjustment plate 413 moving towards the longitudinal side of the body panel 2, it continuously squeezes the square steel 3 longitudinally and pushes the body panel 2 to move longitudinally, realizing the adjustment of the longitudinal position of the body panel 2. By using the horizontal movement of the transverse adjustment plate 411 to drive the longitudinal adjustment plate 413 to move longitudinally synchronously, the synchronous position adjustment of the body panel 2 in the horizontal and longitudinal directions is realized until the transverse side and the longitudinal side of the body panel 2 respectively press the square steel 3 against the limit mechanism 42, thereby realizing the positioning of the body panel 2 and the square steel 3. At the same time, when the transverse adjustment plate 411 and the longitudinal adjustment plate 413 respectively push the body panel 2 and the corresponding square steel 3 to move from the transverse and longitudinal sides of the body panel 2 to position the body panel 2 and the square steel 3, the transverse adjustment plate 411 and the longitudinal adjustment plate 413 respectively apply forces to the body panel 2 and the corresponding square steel 3 through the ends of the driving arms 52 close to the body panel 2 in each pressing unit installed on the transverse adjustment plate 411 and the longitudinal adjustment plate 413. During this process, the reaction force received by the driving arm 52 from the body panel 2 and the square steel 3 is balanced with the elastic force of the second spring 56 until the transverse side and the longitudinal side of the body panel 2 and the square steel 3 move to contact the ends of the driving arms 52 close to the body panel 2 in the pressing units on the transverse limiting plate 421 and the longitudinal limiting plate 422 respectively. Until the reaction force received by each driving arm 52 is greater than the elastic force of the second spring 56, at this time, the end of the driving arm 52 in contact with the body panel 2 and the square steel 3 moves away from the body panel 2, so that the wedge block 55 at the other end of the driving arm 52 moves away from the body panel 2. During the movement of the wedge block 55, its wedge surface drives the extension part 57 on the pressing arm 51 to move upward, and the end of the pressing arm 51 close to the body panel 2 moves downward until the body panel 2 or the square steel 3 is pressed tightly, ensuring the stability of the welding part and thus ensuring the welding quality;After welding is completed, the driving cylinder 412 drives the transverse adjustment plate 411 and the longitudinal adjustment plate 413 to move in the reverse direction. Each driving arm 52 moves in the reverse direction under the restoring force of the second spring 56, so that the wedge block 55 at the other end of the driving arm 52 moves towards the side close to the vehicle body plate 2. The extension part 57 of each pressing arm 51 moves downward under the action of gravity, so that the end of each pressing arm 51 pressing on the vehicle body plate 2 or the square steel 3 moves upward, thereby releasing the vehicle body plate 2 or the square steel 3, facilitating the unloading of the welded vehicle body plate 2. During the entire pressing and releasing process, no additional power is required, which not only has a simple structure, but also has a low equipment cost and high working efficiency.

Claims

1. An automatic welding device for a breakdown truck body production line, characterized in that: It includes a welding platform (1), on which there is a positioning mechanism (4) for positioning the vehicle body sheet (2) and the square steel (3), and a pressing mechanism (5) for pressing the vehicle body sheet (2) and the square steel (3). The positioning mechanism (4) includes an adjustment mechanism (41) for adjusting the horizontal and vertical positions of the vehicle body sheet (2) and the square steel (3), and a limiting mechanism (42) for horizontally and vertically limiting the vehicle body sheet (2) and the square steel (3); The adjustment mechanism (41) includes a horizontal adjustment plate (411) for adjusting the position of one horizontal side of the vehicle body sheet (2). The horizontal adjustment plate (411) is parallel to one horizontal side of the vehicle body sheet (2). On the side of the horizontal adjustment plate (411) away from the welding center, there is a driving cylinder (412). The driving cylinder (412) is fixed on the welding platform (1), and the telescopic shaft of the driving cylinder (412) is fixedly connected to the horizontal adjustment plate (411); The adjustment mechanism (41) further includes a longitudinal adjustment plate (413) for adjusting the position of one longitudinal side of the vehicle body sheet (2). The longitudinal adjustment plate (413) is in an "L" shape. The horizontal section (414) of the longitudinal adjustment plate (413) is parallel to the horizontal adjustment plate (411), and the vertical section (415) of the longitudinal adjustment plate (413) is parallel to one longitudinal side of the vehicle body sheet (2). One end of the horizontal section (414) of the longitudinal adjustment plate (413) is provided with a guide post (43). The guide post (43) is slidably matched with a guide plate (44) fixed on the horizontal adjustment plate (411). A first spring (45) is sleeved between one end of the guide post (43) and the guide plate (44). One end of the first spring (45) is fixed to the end of the guide post (43), and the other end of the first spring (45) is fixed to the guide plate (44). A through inclined hole (46) is also provided on the horizontal section (414) of the longitudinal adjustment plate (413). On the side of the inclined hole (46) away from the horizontal adjustment plate (411), there is a driving pin (47). The driving pin (47) is slidably matched with the inclined hole (46). The end of the driving pin (47) away from the inclined hole (46) is fixed on the welding platform (1). A horizontal chute (48) is provided on the side of the horizontal adjustment plate (411) close to the welding center. The horizontal chute (48) is located on one side of the inclined hole (46); The pressing mechanism (5) includes a plurality of pressing units, and each pressing unit is respectively installed on the horizontal adjustment plate (411), the longitudinal adjustment plate (413), the horizontal limiting plate and the longitudinal limiting plate; Each pressing unit includes a pressing arm (51) and a driving arm (52) that are parallel to each other. The middle of the pressing arm (51) is rotatably connected to a mounting seat (54) through a rotating shaft (53). The mounting seat (54) is fixed on the transverse adjusting plate (411) or the longitudinal adjusting plate (413) or the transverse limiting plate or the longitudinal limiting plate. The driving arm (52) penetrates through the transverse adjusting plate (411) or the longitudinal adjusting plate (413) or the transverse limiting plate or the longitudinal limiting plate and extends out from the transverse adjusting plate (411) or the longitudinal adjusting plate (413) or the transverse limiting plate or the longitudinal limiting plate. The driving arm (52) is slidably engaged with the transverse adjusting plate (411) or the longitudinal adjusting plate (413) or the transverse limiting plate or the longitudinal limiting plate. A wedge block (55) for driving the pressing wall to rotate around the rotating shaft (53) is provided at one end of the driving arm (52) away from the welding center. A second spring (56) is sleeved on the driving arm (52) at a position between the wedge block (55) and the transverse adjusting plate (411) or the longitudinal adjusting plate (413) or the transverse limiting plate or the longitudinal limiting plate. One end of the second spring (56) is fixed on the wedge block (55), and the other end of the second spring (56) is fixed on the transverse adjusting plate (411) or the longitudinal adjusting plate (413) or the transverse limiting plate or the longitudinal limiting plate. An extension portion (57) extending downward is provided at one end of the pressing arm (51) away from the welding center. The extension portion (57) abuts against the wedge surface of the wedge block (55).

2. The automatic welding equipment for a breakdown truck body production line according to claim 1, characterized in that: The limiting mechanism (42) includes a transverse limiting plate and a longitudinal limiting plate. The transverse limiting plate is parallel to the transverse adjusting plate (411), and the longitudinal limiting plate is parallel to the vertical section (415) of the longitudinal adjusting plate (413). The transverse limiting plate and the transverse adjusting plate (411) are respectively opposite to two transverse sides of the vehicle body plate (2), and the longitudinal limiting plate and the vertical section (415) of the longitudinal adjusting plate (413) are respectively opposite to two longitudinal sides of the vehicle body plate (2).

3. The automatic welding equipment for the body production line of a wrecking truck according to claim 1, characterized in that: It further includes a gantry (6) located above the welding platform (1). Both sides of the gantry (6) reciprocate along a steel rail (7) parallel to the length direction of the welding platform (1) on the ground on both sides of the welding platform (1) through traveling wheels. A transverse slide rail (8) parallel to the width direction of the welding platform (1) and a transverse slider (9) slidably engaged with the transverse slide rail (8) are provided on the gantry (6). The transverse slider (9) is threadedly connected to a transverse lead screw (10) parallel to the transverse slide rail (8). One end of the transverse lead screw (10) is connected to a driving motor (11). A robot welder (12) is fixedly provided at the bottom of the transverse slider (9).

4. The automatic welding equipment for the body production line of a wrecker, according to claim 3, is characterized in that: The welding platform (1) includes a support plate (13) for supporting the vehicle body sheet (2). A plurality of rolling mechanisms (14) are evenly distributed on the support plate (13). The rolling mechanism (14) includes a sphere (141). The sphere (141) is embedded in a spherical hole (142) on the support plate (13). The sphere (141) can rotate 360° along the spherical hole (142). The highest point of the sphere (141) is higher than the upper surface of the support plate (13).

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