High-stability resistance spot welding connecting mechanism for body parts

Abstract

The utility model relates to the field of automobile body manufacturing and automatic welding technology, and specifically relates to a high-stability resistance spot welding connecting mechanism for automobile body parts, which comprises a workbench, the upper surface of the workbench is fixedly connected with a support arm, the inner wall of the support arm is slidably connected with a mechanical arm, the side wall of the mechanical arm is fixedly connected with a fixed plate, and the side wall of the mechanical arm is fixedly connected with a rectangular plate. The utility model can realize the automatic centering and synchronous opposite movement of the upper and lower clamping plates through the synchronous transmission mechanism of the lever connecting rod, when the upper clamping plate is driven downward by the air cylinder, the movable rod is forced to press down through the pressing rod, and the lever is driven to rotate around the fulcrum, so that the lower clamping plate is accurately driven to move upward. This mechanical linkage process ensures that the workpiece to be welded can be clamped from both sides at the same time and uniformly, effectively overcomes the workpiece deviation and warping caused by one-sided pressure or time sequence deviation, and provides a solid mechanical guarantee for forming a position-accurate welding spot.

Description

Technical Field

[0001] This utility model relates to the field of automotive body manufacturing and automated welding technology, specifically a high-stability resistance spot welding connection mechanism for automotive body parts. Background Technology

[0002] In the automotive body manufacturing process, resistance spot welding has become one of the main processes for connecting stamped sheet metal parts of the car body due to its advantages such as high efficiency, low cost and ease of automation. The quality of spot welding is directly related to the strength, rigidity and safety of the car body assembly. Existing resistance spot welding equipment usually consists of an upper electrode, a lower electrode and a power mechanism that drives the upper electrode to move. During welding, two or more layers of plates to be welded are placed between the upper and lower electrodes. Pressure is applied through the electrodes and a strong current is passed through them. The Joule heat generated by the contact resistance of the workpiece is used to locally melt the metal and form a weld spot.

[0003] However, in existing resistance spot welding equipment, stable clamping and alignment of workpieces still face challenges. Common equipment often uses the method of active downward pressure of the upper electrode and fixation of the lower electrode to achieve clamping. This is unilateral pressure, which can easily lead to poor adhesion or microscopic misalignment for stacked thin plates. Even in the case of using a liftable lower electrode or an independent side clamp, the clamping action depends on multiple separately controlled power sources, making it difficult to achieve perfect synchronization of the action sequence. Moreover, the control system is complex. This asynchrony or non-opposite direction in the clamping process can easily cause the workpiece to shift or warp before welding, directly affecting the accuracy of the weld point position and the stability of the connection quality. Secondly, after welding, the clamping mechanism needs to be quickly and reliably reset for the next work cycle. If the reset is not smooth or asynchronous, it may cause the mechanism to jam, affecting the equipment cycle time, or even causing damage to the workpiece or equipment. To address these issues, we propose a high-stability resistance spot welding connection mechanism for vehicle body parts. Utility Model Content

[0004] The purpose of this invention is to provide a highly stable resistance spot welding connection mechanism for vehicle body parts, so as to solve the problems mentioned in the background art.

[0005] The technical solution of this utility model is: a high-stability resistance spot welding connection mechanism for vehicle body parts, including a worktable, a support arm fixedly connected to the upper surface of the worktable, a robotic arm slidably connected to the inner wall of the support arm, a fixed plate fixedly connected to the side wall of the robotic arm, a rectangular plate fixedly connected to the side wall of the robotic arm, a cylinder fixedly connected to the upper surface of the fixed plate, the movable end of the cylinder penetrating the upper surface of the rectangular plate and extending to the lower part of the rectangular plate, an upper mounting seat fixedly connected to the movable end of the cylinder, an upper electrode disposed on the upper mounting seat, the lower end of the upper electrode penetrating the upper surface of the upper mounting seat and extending to the lower part of the upper mounting seat, the upper mounting seat being fixedly connected to the surface of the upper electrode, a lower mounting seat fixedly connected to the upper surface of the worktable, a lower electrode disposed on the lower mounting seat, the upper end of the lower electrode penetrating the lower surface of the lower mounting seat and extending to the upper part of the lower mounting seat, the lower mounting seat being fixedly connected to the surface of the lower electrode, and a synchronous fixing device disposed on the worktable.

[0006] Preferably, the synchronous fixing device includes an upper clamping plate, which is fixed to the lower surface of the upper mounting base. An L-shaped rod is fixedly connected to the side wall of the upper clamping plate, and a pressure rod is fixedly connected to the lower surface of the L-shaped rod. Two symmetrically arranged support rods are fixedly connected to the upper surface of the worktable. A lever is rotatably connected to the side wall of each support rod. Two symmetrically arranged springs are fixedly connected to the upper surface of the worktable. The upper end of each spring is fixedly connected to the lower surface of the adjacent lever. The same lower clamping plate is rotatably connected to the side wall of the two levers. A movable rod is rotatably connected to the side wall of each lever. A dovetail groove is formed on the side wall of each movable rod. A limit rod is slidably connected to the inner wall of each dovetail groove. Each limit rod is fixedly connected to the upper surface of the worktable. The same round rod is rotatably connected to the side wall of the two movable rods.

[0007] Preferably, the lower surface of the lower clamping plate has four symmetrically arranged mounting holes, and the upper surface of the workbench is fixedly connected to four symmetrically arranged lifting rods, with the movable end of each lifting rod being fixedly connected to the inner wall of the adjacent mounting hole.

[0008] Preferably, the pressure bar is matched with two movable rods, and the pressure bar is positioned directly above the two movable rods.

[0009] Preferably, the upper clamping plate matches the lower clamping plate, and the upper clamping plate is positioned directly above the lower clamping plate.

[0010] This utility model provides an improved high-stability resistance spot welding connection mechanism for vehicle body parts, which has the following improvements and advantages compared with the prior art: Firstly, this utility model, through the set lever-link synchronous transmission mechanism, realizes the automatic centering and synchronous opposite movement of the upper and lower clamping plates. When the cylinder drives the upper clamping plate to move down, the pressure rod forces the movable rod to press down, thereby driving the lever to rotate around the fulcrum, thus accurately driving the lower clamping plate to move up. This mechanical linkage process ensures that the workpiece to be welded can be clamped simultaneously and evenly from both the upper and lower sides, effectively overcoming the workpiece offset and warping caused by unilateral pressure or timing deviation, and providing a solid mechanical guarantee for forming accurately positioned weld points.

[0011] Secondly, this utility model allows the entire clamping mechanism to automatically reset after welding. By incorporating a spring, when welding is completed and the cylinder drives the upper electrode and upper clamping plate to rise, the pressure applied to the movable rod is instantly released. At this moment, the stretched spring immediately releases its stored elastic potential energy, generating a strong restoring force that pulls the lever to rotate in the opposite direction around its fulcrum, thereby reliably driving the lower clamping plate to descend smoothly to its initial position. The entire reset process is driven by the physical characteristics of the spring, requiring no additional power source or control signal. The action is rapid and consistent. The mounting holes on the lower surface of the lower clamping plate cooperate with the movable end of the lifting rod fixed on the worktable, ensuring the vertical guidance of the lower clamping plate's movement during the reset process. This effectively prevents tilting or jamming, allowing the equipment to quickly prepare for the next work cycle, greatly improving work efficiency and reliability. Attached Figure Description

[0012] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the pressure bar structure of this utility model; Figure 3 This is a schematic diagram of the lever structure of this utility model; Figure 4 This is a schematic diagram of the mounting hole structure of this utility model; Figure 5 for Figure 3 A magnified structural diagram at point A in the diagram.

[0013] Explanation of reference numerals in the attached figures: 1. Workbench; 2. Support arm; 3. Robotic arm; 4. Fixed plate; 5. Rectangular plate; 6. Cylinder; 7. Upper mounting base; 8. Upper electrode; 9. Lower mounting base; 10. Lower electrode; 11. Upper clamping plate; 12. L-shaped rod; 13. Pressure rod; 14. Support rod; 15. Lever; 16. Spring; 17. Lower clamping plate; 18. Movable rod; 19. Dovetail groove; 20. Limiting rod; 21. Round rod; 22. Mounting hole; 23. Lifting rod. Detailed Implementation

[0014] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0015] This utility model provides an improved high-stability resistance spot welding connection mechanism for vehicle body parts. The technical solution of this utility model is as follows: like Figure 1 - Figure 5 As shown, a high-stability resistance spot welding connection mechanism for vehicle body parts includes a worktable 1. A support arm 2 is fixedly connected to the upper surface of the worktable 1. A robotic arm 3 is slidably connected to the inner wall of the support arm 2. A fixing plate 4 is fixedly connected to the side wall of the robotic arm 3. A rectangular plate 5 is fixedly connected to the side wall of the robotic arm 3. A cylinder 6 is fixedly connected to the upper surface of the fixing plate 4. The movable end of the cylinder 6 passes through the upper surface of the rectangular plate 5 and extends to the bottom of the rectangular plate 5. An upper mounting seat 7 is fixedly connected to the movable end of the cylinder 6. An upper electrode 8 is provided on the upper mounting seat 7. The lower end of the upper electrode 8 passes through the upper surface of the upper mounting seat 7 and extends to the bottom of the upper mounting seat 7. The upper mounting seat 7 is fixedly connected to the surface of the upper electrode 8. A lower mounting seat 9 is fixedly connected to the upper surface of the worktable 1. A lower electrode 10 is provided on the lower mounting seat 9. The upper end of the lower electrode 10 passes through the lower surface of the lower mounting seat 9 and extends to the top of the lower mounting seat 9. The lower mounting seat 9 is fixedly connected to the surface of the lower electrode 10. A synchronous fixing device is provided on the worktable 1.

[0016] Furthermore, the synchronous fixing device includes an upper clamping plate 11, which is fixed to the lower surface of the upper mounting base 7. An L-shaped rod 12 is fixedly connected to the side wall of the upper clamping plate 11, and a pressure rod 13 is fixedly connected to the lower surface of the L-shaped rod 12. Two symmetrically arranged support rods 14 are fixedly connected to the upper surface of the worktable 1. A lever 15 is rotatably connected to the side wall of each support rod 14. Two symmetrically arranged springs 16 are fixedly connected to the upper surface of the worktable 1. The upper end of each spring 16 is fixedly connected to the lower surface of the adjacent lever 15. The same lower clamping plate 17 is rotatably connected to the side wall of the two levers 15. A movable lever 13 is rotatably connected to the side wall of each lever 15. The movable rod 18 has a dovetail groove 19 on its side wall. The inner wall of each dovetail groove 19 is slidably connected to a limit rod 20. Each limit rod 20 is fixedly connected to the upper surface of the worktable 1. The side walls of two movable rods 18 are rotatably connected to the same round rod 21. The support rod 14 allows the lever 15 to move in an arc around the connection point with the support rod 14. By setting the spring 16, it can be ensured that after the spot welding is completed, the lever 15 is reset by the tension of the spring 16. The dovetail groove 19 limits the movement of the movable rod 18, so that the movable rod 18 can only move vertically up and down along the trajectory of the dovetail groove 19.

[0017] Furthermore, the lower clamping plate 17 has four symmetrically arranged mounting holes 22 on its lower surface, and four symmetrically arranged lifting rods 23 are fixedly connected to the upper surface of the worktable 1. The movable end of each lifting rod 23 is fixedly connected to the inner wall of the adjacent mounting hole 22. When the lower clamping plate 17 moves upward due to the lever 15, the four lifting rods 23 rise synchronously. At the same time as they rise, because the movable end of the lifting rod 23 is inside the mounting hole 22, the lower clamping plate 17 always remains horizontal and will not tilt when it moves upward.

[0018] Furthermore, the pressure rod 13 is matched with two movable rods 18. The pressure rod 13 is positioned directly above the two movable rods 18. With this arrangement, when the pressure rod 13 moves downward, it can be ensured that the lower surface of the pressure rod 13 presses against the upper surface of the movable rod 18 and presses down the movable rod 18, causing the movable rod 18 to move downward.

[0019] Furthermore, the upper clamping plate 11 is matched with the lower clamping plate 17, with the upper clamping plate 11 positioned directly above the lower clamping plate 17. This arrangement ensures that the upper clamping plate 11 and the lower clamping plate 17 stably clamp the welded part without misalignment.

[0020] Working principle: Upon initial use, place the two stacked workpieces to be welded at a suitable position above the lower electrode 10. Then, control the robotic arm 3 to move downwards along the support arm 2, lowering the entire welding head to a predetermined height. At this point, the cylinder 6 is activated, extending its movable end downwards and pushing the upper mounting base 7 and the upper electrode 8 fixed thereon downwards. Simultaneously, the upper clamping plate 11, fixed to the lower surface of the upper mounting base 7, moves downwards in sync. The upper clamping plate 11, via the L-shaped rod 12, drives the pressure rod 13 downwards. When the pressure rod 13 contacts and presses down on the upper ends of the two movable rods 18, it forces the movable rods 18 to slide downwards along the constraint of the limiting rod 20. Because the movable rods 18 are slidably connected to the limiting rod 20 via the dovetail groove 19, their movement trajectory is strictly limited to the vertical direction. The downward movement of the movable rods 18 forces the lever 15... The lever 15 rotates at its hinge point with the support rod 14, meaning that the end of the lever 15 closest to the movable rod 18 presses down, while the other end of the lever 15 tilts up and stretches the spring 16. The two ends of the lever 15 rotate together to drive the lower clamping plate 17 to move upward. During the upward movement, the lower clamping plate 17, through the mounting hole 22 on its lower surface, engages with the movable ends of the four lifting rods 23 fixed on the worktable 1, ensuring the smoothness and levelness of the upward movement and preventing tilting. Finally, the upper clamping plate 11 and the lower clamping plate 17 clamp the workpiece to be welded from both sides simultaneously. Almost at the same moment, the upper electrode 8 and the lower electrode 10 contact the workpiece and are energized, completing the resistance spot welding. After welding, the cylinder 6 retracts, and under the restoring force of the spring 16, the lever 15 rotates in the opposite direction, driving the entire clamping mechanism to reset and prepare for the next operation.

[0021] The foregoing description enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-stability resistance spot welding connection mechanism for body parts, comprising a worktable (1), characterized in that: A support arm (2) is fixedly connected to the upper surface of the workbench (1). A mechanical arm (3) is slidably connected to the inner wall of the support arm (2). A fixing plate (4) is fixedly connected to the side wall of the mechanical arm (3). A rectangular plate (5) is fixedly connected to the side wall of the mechanical arm (3). A cylinder (6) is fixedly connected to the upper surface of the fixing plate (4). The movable end of the cylinder (6) passes through the upper surface of the rectangular plate (5) and extends to the bottom of the rectangular plate (5). An upper mounting base (7) is fixedly connected to the movable end of the cylinder (6). An upper electrode (8) is provided on the upper mounting base (7). The lower end of the upper electrode (8) penetrates the upper surface of the upper mounting base (7) and extends to the lower part of the upper mounting base (7). The upper mounting base (7) is fixedly connected to the surface of the upper electrode (8). The upper surface of the worktable (1) is fixedly connected to the lower mounting base (9). The lower mounting base (9) is provided with a lower electrode (10). The upper end of the lower electrode (10) penetrates the lower surface of the lower mounting base (9) and extends to the upper part of the lower mounting base (9). The lower mounting base (9) is fixedly connected to the surface of the lower electrode (10). The worktable (1) is provided with a synchronous fixing device.

2. A high-stability resistance spot welding connection mechanism for a vehicle body component according to claim 1, characterized in that: The synchronous fixing device includes an upper clamping plate (11), which is fixed to the lower surface of the upper mounting base (7). An L-shaped rod (12) is fixedly connected to the side wall of the upper clamping plate (11), and a pressure rod (13) is fixedly connected to the lower surface of the L-shaped rod (12). Two symmetrically arranged support rods (14) are fixedly connected to the upper surface of the worktable (1). A lever (15) is rotatably connected to the side wall of each support rod (14). Two symmetrically arranged springs (16) are fixedly connected to the upper surface of the worktable (1). The upper end of 6) is fixedly connected to the lower surface of the adjacent lever (15). The side walls of the two levers (15) are rotatably connected to the same lower clamp (17). The side walls of each lever (15) are rotatably connected to a movable rod (18). The side walls of each movable rod (18) are provided with a dovetail groove (19). The inner wall of each dovetail groove (19) is slidably connected to a limit rod (20). Each limit rod (20) is fixedly connected to the upper surface of the worktable (1). The side walls of the two movable rods (18) are rotatably connected to the same round rod (21).

3. A high-stability resistance spot welding connection mechanism for a vehicle body component according to claim 2, characterized in that: The lower clamping plate (17) has four symmetrically arranged mounting holes (22) on its lower surface. The upper surface of the workbench (1) is fixedly connected to four symmetrically arranged lifting rods (23). The movable end of each lifting rod (23) is fixedly connected to the inner wall of the adjacent mounting hole (22).

4. The high-stability resistance spot welding connection mechanism for vehicle body parts according to claim 2, characterized in that: The pressure bar (13) is matched with two movable rods (18), and the pressure bar (13) is positioned directly above the two movable rods (18).

5. The high-stability resistance spot welding connection mechanism for vehicle body parts according to claim 2, characterized in that: The upper clamping plate (11) matches the lower clamping plate (17), and the upper clamping plate (11) is positioned directly above the lower clamping plate (17).

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