Resistance welding device for automotive parts

Abstract

This invention relates to the field of automotive parts welding technology, specifically disclosing a resistance welding device for automotive parts, including a robotic arm device, a resistance welding device, multiple sets of bases, slide rails, slide blocks, a main clamping mechanism, an auxiliary clamping mechanism, and a drive avoidance mechanism. During the welding process, the base is driven to generate an avoidance displacement by squeezing the cylinder, and the main clamping mechanism is linked to release the clamp and the auxiliary clamping mechanism to form an auxiliary clamp, thereby exposing the weld area. The auxiliary clamping mechanism automatically flips and clamps under the constraint of the hollow tube and the action of the elastic element, and increases the avoidance space between itself and the welding head through the pad structure. This invention can automatically complete the base avoidance and clamping mechanism switching actions according to different weld position, avoiding interference between the base and the clamping mechanism and the welding head during the welding process, and improving the welding adaptability and welding stability of automotive parts of different lengths and installation positions.

Description

Technical Field

[0001] This invention relates to the field of technology, specifically to a resistance welding apparatus for automotive parts. Background Technology

[0002] Resistance welding is a welding method that uses an electric current to generate heat at the contact points of workpieces to achieve local fusion. Due to its high welding efficiency, stable welding strength, and high degree of automation, it is widely used in the automotive parts manufacturing industry. For long and strip-shaped structural parts in automobiles, it is usually necessary to weld multiple small parts on the surface of the long and strip-shaped workpiece. Therefore, during the welding process, it is usually necessary to fix the workpiece with a fixture and cooperate with a robotic arm to drive the resistance welding device to move along the length of the workpiece in order to complete the continuous welding of multiple weld points.

[0003] Most existing clamping mechanisms are fixed structures, which can easily obstruct the welding area during the welding process. Especially when the welding point is near the fixture, the welding head can easily interfere with the fixture, support base, and other structures, resulting in some welding points being unwelded or requiring manual readjustment of the fixture position. This not only reduces welding efficiency but also easily causes workpiece position displacement, affecting welding quality. In addition, existing fixture structures are usually difficult to adapt to small workpieces of different lengths and installation positions. There is a lack of devices that can automatically adjust according to the welding point position during the welding process, making it difficult to meet the needs of continuous automated welding of automotive parts.

[0004] Therefore, we propose a resistance welding device for automotive parts. Summary of the Invention

[0005] The purpose of this invention is to provide a resistance welding apparatus for automotive parts to overcome the aforementioned shortcomings of the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a resistance welding device for automotive parts, comprising a robotic arm device and a resistance welding device, wherein the robotic arm device is used to drive the resistance welding device to move along the length direction of the long workpiece and perform welding, and further comprising: Multiple sets of equally spaced bases are used to support long workpieces; The slide rail has multiple sets of slide blocks that slide on it, and each slide block is equipped with a main clamping mechanism and an auxiliary clamping mechanism. The extrusion cylinder and pressure block are mounted on the resistance welding device, and the driving avoidance mechanism is corresponding to each base. The driving avoidance mechanism is linked to the main clamping mechanism and the auxiliary clamping mechanism through transmission components. When the robotic arm drives the resistance welding device to the welding point position, the extrusion cylinder abuts against the corresponding drive avoidance mechanism, causing the base to generate an avoidance displacement. When the welding head of the resistance welding device presses down, the following actions are triggered through the transmission components and pressure block: the main clamping mechanism releases its clamping of the workpiece, while the auxiliary clamping mechanism clamps the edge of the workpiece that is obscured, so as to expose the welding point area; and the linkage sequence of the transmission components is set to ensure that the clamping action of the auxiliary clamping mechanism is completed before the main clamping mechanism releases its clamping action, and to maintain that it does not interfere with the space of the welding head of the resistance welding device, so as to realize the adaptive avoidance welding action of the welding point. The driving coverage range of the drive avoidance mechanism is matched with the sliding stroke, so that the welding points at each position can achieve adaptive avoidance through the drive avoidance mechanism during the welding process.

[0007] As a further description of the above technical solution: the drive avoidance mechanism includes two sets of telescopic rails and an intermediate rail disposed between the two sets of telescopic rails. The two sets of telescopic rails are slidably connected to the slide block, and the connecting shafts of the two telescopic rails and the intermediate rail are respectively connected to the slide block through a pull rod, which can generate changes in length and tilt angle during the movement of the slide block.

[0008] As a further description of the above technical solution: the intermediate track covers the width range of the corresponding base throughout the entire travel of the slide, so that the extruded cylinder can maintain an abutment state with the drive avoidance mechanism in different slide positions.

[0009] As a further description of the above technical solution: the two sets of telescopic tracks form different tilt angles during the movement of the slide, so that the base produces avoidance displacements at different speeds at different positions.

[0010] As a further description of the above technical solution: the main clamping mechanism includes a main clamping pressure plate and a rotating frame. The main clamping pressure plate and the rotating frame are rotatably connected by a torsion spring, and the rotating frame is rotatably mounted on the slide. The distance between the connecting shafts of the two sets of telescopic tracks and the intermediate track is greater than the width of the main clamping pressure plate, and the edge of the main clamping pressure plate is located between the two connecting shafts.

[0011] As a further description of the above technical solution: the pressure block is positioned above the connection between the main clamping pressure plate and the rotating frame, so as to realize the flipping and avoidance action of the main clamping pressure plate under the squeezing action of the pressure block.

[0012] As a further description of the above technical solution: the auxiliary clamping mechanism includes an auxiliary clamping pressure plate disposed in the hollow tube. The auxiliary clamping pressure plate is disposed on the rack two through an elastic element and is kept in a retracted state under the constraint of the hollow tube. After the drive avoidance mechanism moves to the preset position, it is released from the constraint and forms a flipping clamping action on the long workpiece. The rack two is slidably disposed in the hollow tube.

[0013] As a further description of the above technical solution: a pad is provided at the bottom of the auxiliary clamping plate. The pad is used to make the end of the auxiliary clamping plate abut against the upper inner surface of the hollow tube when the auxiliary clamping plate is located inside the hollow tube, so that the auxiliary clamping plate remains in an upward tilted state before it is freed from the constraint of the hollow tube.

[0014] As a further description of the above technical solution: the transmission component includes a push plate disposed on the base, a rack one mounted on the push plate, and a gear rotating on the outside of the hollow tube. Both rack one and rack two are meshed with the gear, driving the auxiliary clamping pressure plate to move towards the workpiece during the movement of the base.

[0015] As a further description of the above technical solution: the moving range of each slide is matched with the driving coverage range of the corresponding driving avoidance mechanism, so that the welding head can drive the base to generate an avoidance action when moving within the corresponding range.

[0016] In the above technical solution, the resistance welding device for automotive parts provided by the present invention has the following beneficial effects: 1. The present invention, by setting a drive avoidance mechanism, enables the base to automatically generate an avoidance displacement according to the position of the weld point during the welding process, thereby preventing the base from interfering with the welding head and improving the welding continuity.

[0017] 2. The present invention uses a linkage switching structure between the main clamping mechanism and the auxiliary clamping mechanism to enable the auxiliary clamping mechanism to form auxiliary clamping in advance before the main clamping mechanism releases clamping, thereby ensuring that the workpiece remains stably positioned during the clamping switching process and preventing displacement during welding.

[0018] 3. By setting up telescopic tracks and intermediate tracks, the present invention enables the drive avoidance mechanism to form different drive states according to the position of the slide block, so as to adapt to the welding requirements of welding points at different positions and improve the self-adaptability of the overall structure.

[0019] 4. The present invention provides a pad at the bottom of the auxiliary clamping plate so that the auxiliary clamping plate remains tilted upward before being freed from the constraint of the hollow tube, thereby increasing the clearance space between the auxiliary clamping mechanism and the welding head and further reducing the risk of welding interference.

[0020] 5. This invention can adapt to the welding needs of small workpieces of different lengths and installation positions, and realize the linkage and coordination of base avoidance, clamping switching and welding actions during the welding process, thereby improving the automation level and welding stability of automotive parts welding process. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the exchange clamping mechanism and the auxiliary clamping mechanism provided in the embodiments of the present invention; Figure 3 This is a schematic diagram of the main clamping mechanism and auxiliary clamping mechanism provided in an embodiment of the present invention from another angle; Figure 4 This is a schematic diagram of the structure of the variable adjustment rail provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the base provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the auxiliary clamping mechanism provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the pressure block provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the telescopic track in the variable adjustment rail provided in an embodiment of the present invention; Figure 9 This is a structural schematic diagram of the cross-section of a hollow tube provided in an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures: 1. Robotic arm device; 2. Resistance welding device; 3. Base; 4. Slide rail; 5. Telescopic rail; 6. Intermediate rail; 7. Main clamping pressure plate; 8. Rotating frame; 9. Contact plate; 10. Pull rod; 11. Spring; 12. Gear; 13. Rack one; 14. Bolt; 15. Slide seat; 16. Limiting plate; 17. Push plate; 18. Hollow tube; 21. Rack two; 22. Auxiliary clamping pressure plate; 23. Pressure block; 24. Extruded cylinder; 25. Pad block. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Please see Figure 1-9The present invention provides a technical solution including a robotic arm device 1 and a resistance welding device 2. The robotic arm device 1 is used to drive the resistance welding device 2 to move along the length of the long workpiece and perform welding. When the resistance welding device 2 moves linearly under the control of the robotic arm device 1, it can spot weld linear automotive parts. During spot welding, the lifting device provided in the resistance welding device 2 makes the two electrodes contact the workpiece to complete the welding. In order to prevent the fixture from interfering with the welding point, the resistance welding device 2 of the present invention also includes multiple sets of equally spaced bases 3 for supporting long strip workpieces. When welding long strip workpieces of automobiles, the workpiece to be welded must first be placed on the base 3. Multiple sets of bases 3 are provided instead of two sets at the beginning and end, so as to form stable support for the workpiece and prevent deformation caused by the contact of the welding head during the welding process. The slide rail 4 has multiple sets of slide blocks 15 slidably mounted on it. Each slide block 15 is equipped with a main clamping mechanism and an auxiliary clamping mechanism. After the long strip-shaped workpiece of the automobile is placed on the base 3, the position of the slide block 15 on the slide rail 4 is adjusted, and then the main clamping mechanism clamps the small workpieces that need to be welded on the long strip-shaped workpiece. In this way, when welding is performed by the resistance welding device 2, the position of the small parts to be welded on the long strip workpiece can be prevented from shifting, thus affecting the overall welding quality. The resistance welding device 2 is also equipped with an extrusion cylinder 24 and a pressure block 23, as well as a drive avoidance mechanism corresponding to each base 3. The drive avoidance mechanism is linked to the main clamping mechanism and the auxiliary clamping mechanism through a transmission component. When the robotic arm device 1 drives the resistance welding device 2 to move to the welding point position, the extrusion cylinder 24 abuts against the corresponding drive avoidance mechanism, and the base 3 is driven to generate an avoidance displacement to prevent the base 3 from interfering with the welding head during welding. When the welding head of the resistance welding device 2 is pressed down, the following actions are triggered by the transmission component and the pressure block 23: the main clamping mechanism releases the clamp on the workpiece, and at the same time, the auxiliary clamping mechanism clamps the edge of the workpiece that is covered by the welding point, so as to expose the welding point area and facilitate welding with the resistance welding device 2. The linkage sequence of the transmission component is set to ensure that the clamping action of the auxiliary clamping mechanism is completed before the main clamping mechanism releases the clamping action, and to maintain that it does not interfere with the space of the welding head of the resistance welding device 2, so as to realize the adaptive avoidance welding action of the welding point. In this way, before the main clamping mechanism releases the clamp on the part of the long strip workpiece, the auxiliary clamping mechanism can mechanically assist in clamping the part, and the clamping position is located at the edge of the welding point, which does not obstruct the welding point. There is an overlapping clamping range between the main clamping mechanism and the auxiliary clamping mechanism, thereby preventing the part from loosening when switching clamps, or the part from shifting before the previous welding point is stable, which would affect the welding quality. Furthermore, the auxiliary clamping mechanism always maintains a clearance space with the welding head during the movement to prevent the auxiliary clamping mechanism from interfering with the welding action. In other words, the auxiliary clamping mechanism will not interfere with the welding head during the following processes of the resistance welding device 2's movement: approaching the auxiliary clamping mechanism, having a coincident position with the auxiliary clamping mechanism, and completely passing over the auxiliary clamping mechanism. That is to say, when there is a weld point on the workpiece at the position corresponding to the auxiliary clamping mechanism, and at the position of the auxiliary clamping mechanism plus or minus one welding head distance (or slightly larger), the auxiliary clamping mechanism will never affect the welding or cause interference. Furthermore, the driving coverage of the drive avoidance mechanism is matched with the moving stroke of the slide 15, so that when the resistance welding device 2 moves within the corresponding stroke range of the slide 15, the extrusion cylinder 24 can continuously maintain a linked and resisting state with the drive avoidance mechanism, so that the welding points at different positions can achieve adaptive avoidance through the drive avoidance mechanism during the welding process, in order to adapt to the welding needs of small workpieces of different lengths and positions. Furthermore, the two sets of telescopic tracks 5 form different tilt angles during the movement of the slide 15, so that the drive avoidance mechanism retains the subsequent drive stroke before the welding head moves to the position corresponding to the main clamping mechanism. Thus, during the process of the main clamping mechanism releasing the clamp and the auxiliary clamping mechanism forming the auxiliary clamp, the drive avoidance mechanism can still continuously drive the base 3 to generate avoidance displacement, preventing the extrusion cylinder 24 from prematurely contacting the intermediate track 6, resulting in insufficient subsequent linkage stroke and the inability to avoid the situation. In one embodiment of the present invention, the drive avoidance mechanism includes two sets of telescopic rails 5 and an intermediate rail 6 disposed between the two sets of telescopic rails 5. The two sets of telescopic rails 5 are slidably connected to the slide block 15, and the connecting shafts of the two telescopic rails 5 and the intermediate rail 6 are respectively connected to the slide block 15 through the pull rod 10, which can generate changes in length and tilt angle during the movement of the slide block 15. Please see Figure 8 Both sets of telescopic tracks 5 include an outer rail and an inner rail that are nested together. The inner rail is slidably set inside the outer rail so that the telescopic track 5 can extend and retract along its own length direction when it is driven by the traction rod 10. When the slide block 15 moves along the slide rail 4, the slide block 15 drives the connecting shaft between the two sets of telescopic rails 5 and the middle rail 6 to move synchronously through the pull rod 10. Since the other ends of the two sets of telescopic rails 5 are relatively fixed, the inner rail and the outer rail slide relative to each other, resulting in changes in length and tilt angle. When the slide block 15 is moved to the appropriate position, a bolt 14 is provided on the slide block 15. Tighten the bolt 14 so that the end of the bolt 14 abuts against the slide rail 4, thereby fixing the slide block 15. After the slide 15 moves to different positions, the two sets of telescopic tracks 5 form different inclination states, so that the extruded cylinder 24 forms different driving displacement speeds when it moves along the telescopic tracks 5. When the weld point is far from the main clamping mechanism, the telescopic track 5 has a large tilt angle, which allows the extrusion cylinder 24 to quickly drive the base 3 to generate an avoidance displacement when pushing the drive avoidance mechanism, so that the base 3 leaves the weld point area in advance. When the weld point gradually approaches the corresponding area of ​​the main clamping mechanism, the tilt angle of the telescopic track 5 is relatively reduced, which reduces the avoidance displacement speed of the drive avoidance mechanism, thereby preserving the subsequent drive stroke. This ensures that during the process of the main clamping mechanism releasing the clamp and the auxiliary clamping mechanism forming the auxiliary clamp, the drive avoidance mechanism can still continuously drive the base 3 to generate an avoidance displacement, preventing the extrusion cylinder 24 from contacting the intermediate track 6 in advance and causing insufficient subsequent linkage stroke. Furthermore, the intermediate track 6 is positioned between the two sets of telescopic tracks 5. Even after the length and tilt angle of the two sets of telescopic tracks 5 change, the intermediate track 6 can still cover the width range of the corresponding base 3. This ensures that the extruded cylinder 24 can maintain a linked and resistive state with the drive avoidance mechanism when it moves within the corresponding stroke range of the slide block 15. As a result, when the welding head moves to different welding point positions in the corresponding area, the drive avoidance mechanism can continuously drive the base 3 to generate avoidance displacement. It also maintains a linked action during the process of the main clamping mechanism releasing the clamp and the auxiliary clamping mechanism forming the auxiliary clamp, so as to prevent the base 3, the main clamping mechanism, or the auxiliary clamping mechanism from interfering with the welding head and realizing continuous avoidance welding of welding points at different positions. Since the avoidance action of the drive avoidance mechanism is not only triggered when the weld point interferes with the base 3, the drive avoidance mechanism can drive the base 3 to generate avoidance displacement in advance before some weld points interfere with the base 3, thereby reserving avoidance space for the subsequent welding area, so as to improve the continuity and stability of the overall welding process. No matter where the weld point is, it can ensure that the base 3 will not interfere with the welding. Here is a detailed explanation: Since the small workpieces to be welded on the long strip workpiece have a certain length and are equipped with multiple welding points, the distribution of each welding point in the length direction is different. Some welding points are located far away from the main clamping mechanism, while some welding points gradually approach the main clamping mechanism. When the weld point is located far from the main clamping mechanism and is close to the corresponding base 3, the welding head may be interfered with by the base 3 being below the welding head during the process of moving to the weld point. At this time, the telescopic track 5 at the corresponding position has a large tilt angle, so that the extrusion cylinder 24 can quickly drive the drive avoidance mechanism when moving along the telescopic track 5, thereby driving the base 3 to leave the weld point area in advance to prevent the base 3 from blocking the welding head. When the weld point is located far from the main clamping mechanism, but there is no interference between the corresponding weld point and the base 3, even if the drive avoidance mechanism still causes the base 3 to make an avoidance displacement, it will not affect the welding action, and can reserve avoidance space for the subsequent weld point area in advance to improve the continuity of the subsequent welding process. As the welding head continues to move to a position close to the main clamping mechanism, the telescopic track 5 on the other side gradually pulls the drive avoidance mechanism in the opposite direction. At this time, although the base 3 begins to move back towards the initial position, the base 3 moves back at a speed lower than the moving speed of the welding head because the tilt angle of the telescopic track 5 on this side is relatively small. Thus, during the process of the welding head moving to the subsequent welding point position, the base 3 can still maintain the avoidance state, preventing the base 3 from returning to its original position in advance and interfering with the welding head again. It should also be noted that since the area between adjacent drive avoidance mechanisms does not correspond to the base 3, the main clamping mechanism or the auxiliary clamping mechanism, when the welding head moves to the area between adjacent drive avoidance mechanisms, even if the extrusion cylinder 24 does not drive the drive avoidance mechanism, it will not affect the normal welding of the corresponding weld point by the welding head. In another embodiment of the present invention, the main clamping mechanism includes a main clamping pressure plate 7 and a rotating frame 8. The main clamping pressure plate 7 and the rotating frame 8 are rotatably connected by a torsion spring, and the rotating frame 8 is rotatably mounted on the slide 15. The distance between the connecting shafts of the two sets of telescopic tracks 5 and the intermediate track 6 is greater than the width of the main clamping pressure plate 7, and the edge of the main clamping pressure plate 7 is located between the two connecting shafts. Due to the different lengths of the small workpieces and the different distribution positions of the weld points on the long strip workpiece, the welding head will sequentially correspond to the weld points at different positions as it moves along the length direction of the workpiece. The distance between the connecting shafts is greater than the width of the main clamping pressure plate 7, and the edge of the main clamping pressure plate 7 is located between the two connecting shafts. When the welding head moves to the welding point position corresponding to the edge of the main clamping pressure plate 7, the extrusion cylinder 24 on the resistance welding device 2 is located at the end of the corresponding telescopic track 5 and has not yet formed contact with the middle track 6. At this time, after the welding head is pressed down, it is almost tangent to the edge of the main clamping pressure plate 7. There can be a certain gap, but it will not interfere with the main clamping pressure plate 7. Therefore, the main clamping pressure plate 7 still maintains the clamping state of the small workpiece so that the welding head can directly complete the welding of the corresponding welding point. As the resistance welding device 2 continues to move along the length of the workpiece, the extrusion cylinder 24 disengages from the end of the telescopic track 5 and comes into contact with the middle track 6. At this time, the auxiliary clamping mechanism releases its constraints and forms an auxiliary clamping on the edge of the small workpiece. Meanwhile, the pressure block 23 moves to the position above the connection between the main clamping pressure plate 7 and the rotating frame 8. As the welding head continues to press down, the pressure block 23 presses the connection between the main clamping pressure plate 7 and the rotating frame 8, causing the main clamping pressure plate 7 to flip upward and release the clamping state of the main clamping pressure plate 7 on the small workpiece. This exposes the welding point area that was originally covered by the main clamping pressure plate 7, so that the welding head can continue to complete the welding of subsequent welding points. It should be noted that the pressure block 23 is positioned above the connection point between the main clamping pressure plate 7 and the rotating frame 8, so as to realize the flipping and avoidance action of the main clamping pressure plate 7 under the squeezing action of the pressure block 23. Furthermore, the size of the pressure block 23 is the same as the welding head of the resistance welding device 2. Since the pressure block 23 and the welding head are synchronously positioned on the resistance welding device 2, the pressure block 23 and the welding head always maintain a corresponding position during movement. By setting the size of the pressure block 23 to be the same as the size of the welding head, the pressure block 23 can move in tandem with the welding head during the downward pressing process. The pressure block 23 is designed to control the interference range of the welding head. When the welding head is pressed down, it will not interfere with the main clamping plate 7, and the pressure block 23 will not press the connection between the main clamping plate 7 and the rotating frame 8, thus keeping the main clamping plate 7 in a clamping state. When the welding head is pressed down, it will interfere with the main clamping plate 7, and the pressure block 23 can press the connection between the main clamping plate 7 and the rotating frame 8 in advance, so that the main clamping plate 7 will rotate around the rotating frame 8, thereby releasing the main clamping plate 7 from the obstruction of the welding area in advance. It is important to note that during the pressing down of the welding head of the resistance welding device 2, the main clamping pressure plate 7 will first gradually flip away from the welding head under the action of the pressure block 23. When the main clamping pressure plate 7 flips to the point where it no longer interferes with the welding head, the welding head continues to press down to complete the welding, thereby preventing the welding head from colliding with the main clamping pressure plate 7. This ensures that the flipping and avoidance action of the main clamping mechanism and the welding action are synchronized and stable. The relative height relationship between the pressure block 23 and the welding head, as well as the distance relationship between the pressure block 23 and the end of the welding head, can be adjusted and determined through conventional experiments according to the actual welding situation. The specific details will not be elaborated here. It should also be noted that, to prevent the main clamping plate 7 from bending downwards at the connection point with the rotating frame 8 after prolonged use, thus affecting the clamping effect (i.e., torsion spring fatigue), an abutment plate 9 is installed on the slide 15 via a spring 11. A limit plate 16 is provided on the abutment plate 9. In its initial state, the limit plate 16 is positioned below the connection point between the main clamping plate 7 and the rotating frame 8 to prevent bending. In another embodiment of the present invention, the auxiliary clamping mechanism includes an auxiliary clamping pressure plate 22 disposed inside the hollow tube 18. The auxiliary clamping pressure plate 22 is disposed on a rack 21 via an elastic element. The rack 21 is slidably disposed inside the hollow tube 18. The transmission component includes a push plate 17 disposed on the base 3, a rack 13 mounted on the push plate 17, and a gear 12 rotatably disposed outside the hollow tube 18. The rack 13 and the rack 21 respectively mesh with the gear 12. The push plate 17 is fixedly connected to the base 3. When the extrusion cylinder 24 pushes the drive avoidance mechanism to move and causes the base 3 to make an avoidance displacement, the push plate 17 moves synchronously and drives the rack 13 to move. Since the rack 13 is meshed with the gear 12, the movement of the rack 13 drives the gear 12 to rotate. After the gear 12 rotates, it drives the rack 21, which is meshed with the other side, to move inside the hollow tube 18, thereby causing the auxiliary clamping pressure plate 22 to gradually extend out of the hollow tube 18. One end of the clamping plate 22 is connected to the rack 21 via an elastic element, so that the auxiliary clamping plate 22 can flip under the action of the elastic element after it is freed from the constraint of the hollow tube 18. In the initial state, the auxiliary clamping plate 22 is located inside the hollow tube 18, and the flipping end of the auxiliary clamping plate 22 is restricted by the inner wall of the hollow tube 18, thereby maintaining the storage state to prevent the auxiliary clamping plate 22 from flipping prematurely before the welding head has moved to the corresponding area, thus avoiding interference with the movement path of the welding head. As the drive avoidance mechanism continues to move, rack 21 gradually drives the auxiliary clamping plate 22 to move outward from the hollow tube 18. Before the auxiliary clamping plate 22 is completely detached from the hollow tube 18, it remains in a retracted state and will not flip. At this time, even if the welding head moves to the vicinity of the area corresponding to the auxiliary clamping plate 22, the auxiliary clamping plate 22 will not interfere with the welding head. When the extruded cylinder 24 is detached from the telescopic track 5 and comes into contact with the intermediate track 6, the drive avoidance mechanism drives the push plate 17 to move the last stroke, so that the gear 12 continues to rotate and drives rack 21 to continue to move outward. At this time, the flipping end of the auxiliary clamping plate 22 is completely detached from the constraint range of the hollow tube 18. After losing the constraint of the hollow tube 18, the auxiliary clamping plate 22 flips downward under the action of the elastic element and presses against the small workpiece, so as to form the auxiliary clamping action in advance before the main clamping mechanism releases the clamp. It should also be noted that a pad 25 is provided at the bottom of the auxiliary clamping plate 22. The pad 25 is used to ensure that the end of the auxiliary clamping plate 22 abuts against the upper inner surface of the hollow tube 18 when the auxiliary clamping plate 22 is located inside the hollow tube 18, so that the auxiliary clamping plate 22 remains in an upward tilted state before being released from the constraint of the hollow tube 18. The pad 25 is located below the side of the auxiliary clamping plate 22 near the connection position of the elastic element. When the auxiliary clamping plate 22 is inside the hollow tube 18, the pad 25 first contacts the lower inner surface of the hollow tube 18, causing the other end of the auxiliary clamping plate 22 to tilt upward under the constraint of the hollow tube 18 and abut against the upper inner surface of the hollow tube 18. In this way, as the auxiliary clamping plate 22 moves outward from the hollow tube 18 along with the rack 21... During the operation, the end of the auxiliary clamping plate 22 is always tilted upward, so that the side of the auxiliary clamping plate 22 close to the welding head and the welding head form a larger clearance space. Thus, as the welding head gradually approaches the auxiliary clamping mechanism, corresponds to the auxiliary clamping mechanism, and gradually passes the auxiliary clamping mechanism, the auxiliary clamping plate 22 will not interfere with the welding head, thereby improving the adaptability of the auxiliary clamping mechanism to different welding positions. Since the auxiliary clamping plate 22 is always tilted upward before it is completely freed from the constraint of the hollow tube 18, its flipping end is still in a higher position when it is about to be freed from the hollow tube 18, thereby preventing the auxiliary clamping plate 22 from colliding and interfering with the welding head during the early flipping process. When the auxiliary clamping plate 22 is completely free from the constraint range of the hollow tube 18, the restriction of the hollow tube 18 on the end of the auxiliary clamping plate 22 disappears. At this time, the auxiliary clamping plate 22 flips downward under the action of the elastic element and presses against the edge of the small workpiece to form an auxiliary clamping action. Specifically, the thickness of the pad 25 can be adjusted according to the avoidance requirements between the auxiliary clamping plate 22 and the welding head to ensure that the auxiliary clamping plate 22 can maintain an avoidance state with the welding head under different welding conditions. This will not be elaborated further. In another embodiment of the present invention, the moving range of each slide 15 is matched with the driving coverage range of the corresponding driving avoidance mechanism, so that when the welding head moves in the corresponding range, it can drive the base 3 to generate an avoidance action. Since the installation position and length of different workpieces on the long strip workpiece may be different, or different models of automobile long strip parts are welded, the small workpiece model and position are different, and the installation position and length of different small workpieces on the long strip workpiece are different. Therefore, the slide 15 can be adjusted in position within the corresponding moving range to adapt to the clamping requirements of small workpieces in different positions. The coverage area of ​​the drive avoidance mechanism corresponds to the movement range of the corresponding slide 15, so that when the welding head moves within the corresponding range, the extrusion cylinder 24 always forms contact with the drive avoidance mechanism, thereby automatically completing the avoidance of the base 3 and the switching action of the clamping mechanism according to the position of the weld point. For positions where avoidance is not required, the welding head can directly complete the welding, so that small workpieces of different lengths and different installation positions can achieve adaptive avoidance welding during the welding process, thereby improving the continuity and adaptability of the overall welding process.

[0026] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A resistance welding apparatus (2) for automotive parts, comprising a robotic arm device (1) and a resistance welding device (2), wherein the robotic arm device (1) is used to drive the resistance welding device (2) to move along the length of a long workpiece and perform welding, characterized in that, Also includes: Multiple sets of equally spaced bases (3) are used to support long strip workpieces; The slide rail (4) has multiple sets of slide blocks (15) slidably arranged on it, and each slide block (15) is provided with a main clamping mechanism and an auxiliary clamping mechanism; The extrusion cylinder (24) and pressure block (23) are provided on the resistance welding device (2), and the driving avoidance mechanism is provided on each base (3). The driving avoidance mechanism is connected to the main clamping mechanism and the auxiliary clamping mechanism through the transmission component. When the robotic arm device (1) drives the resistance welding device (2) to move to the welding point position, the extrusion cylinder (24) abuts against the corresponding drive avoidance mechanism, the drive base (3) generates an avoidance displacement, and when the welding head of the resistance welding device (2) presses down, the following actions are triggered through the transmission component and the pressure block (23): the main clamping mechanism releases the clamping of the workpiece, and at the same time the auxiliary clamping mechanism clamps the edge of the workpiece that is covered by the welding point so as to expose the welding point area; and the linkage sequence of the transmission component is set to ensure that the clamping action of the auxiliary clamping mechanism is completed before the main clamping mechanism releases the clamping action, and maintains that it does not interfere with the space of the welding head of the resistance welding device (2) so as to realize the adaptive avoidance welding action of the welding point; The driving coverage of the drive avoidance mechanism is matched with the travel of the slide (15), so that each welding point can achieve adaptive avoidance through the drive avoidance mechanism during the welding process.

2. The resistance welding apparatus (2) for automotive parts according to claim 1, characterized in that, The drive avoidance mechanism includes two sets of telescopic rails (5) and an intermediate rail (6) set between the two sets of telescopic rails (5). The two sets of telescopic rails (5) are slidably connected to the slide (15), and the connecting shafts of the two telescopic rails (5) and the intermediate rail (6) are connected to the slide (15) through the pull rod (10), which can generate changes in length and tilt angle during the movement of the slide (15).

3. The resistance welding apparatus (2) for automotive parts according to claim 2, characterized in that, The intermediate track (6) covers the width range of the corresponding base (3) throughout the entire travel of the slide (15), so that the extruded cylinder (24) can maintain contact with the drive avoidance mechanism in different positions of the slide (15).

4. The resistance welding apparatus (2) for automotive parts according to claim 3, characterized in that, The two sets of telescopic tracks (5) form different tilt angles during the movement of the slide (15) so that the base (3) produces different speeds of avoidance displacement at different positions.

5. The resistance welding apparatus (2) for automotive parts according to claim 2, characterized in that, The main clamping mechanism includes a main clamping pressure plate (7) and a rotating frame (8). The main clamping pressure plate (7) and the rotating frame (8) are rotatably connected by a torsion spring. The rotating frame (8) is rotatably mounted on the slide (15). The distance between the connecting shafts of the two sets of telescopic tracks (5) and the intermediate track (6) is greater than the width of the main clamping pressure plate (7). The edge of the main clamping pressure plate (7) is located between the two connecting shafts.

6. The resistance welding apparatus (2) for automotive parts according to claim 5, characterized in that, The pressure block (23) is positioned above the connection between the main clamping pressure plate (7) and the rotating frame (8) to enable the main clamping pressure plate (7) to flip and avoid the impact of the pressure block (23).

7. The resistance welding apparatus (2) for automotive parts according to claim 1, characterized in that, The auxiliary clamping mechanism includes an auxiliary clamping pressure plate (22) disposed in the hollow tube (18). The auxiliary clamping pressure plate (22) is disposed on the rack two (21) by an elastic element and is kept in a retracted state under the constraint of the hollow tube (18). After the drive avoidance mechanism moves to the preset position, it is released from the constraint and forms a flipping clamping action on the long strip workpiece. The rack two (21) is slidably disposed in the hollow tube (18).

8. The resistance welding apparatus (2) for automotive parts according to claim 1, characterized in that, The bottom of the auxiliary clamping plate (22) is provided with a pad (25). The pad (25) is used to make the end of the auxiliary clamping plate (22) abut against the inner upper surface of the hollow tube (18) when the auxiliary clamping plate (22) is located inside the hollow tube (18), so that the auxiliary clamping plate (22) remains in an upward tilted state before it is freed from the constraint of the hollow tube (18).

9. A resistance welding apparatus (2) for automotive parts according to claim 7, characterized in that, The transmission component includes a push plate (17) mounted on the base (3), a rack (13) mounted on the push plate (17), and a gear (12) rotating on the outside of the hollow tube (18). The rack (13) and rack (21) are both meshed with the gear (12) and drive the auxiliary clamping plate (22) to move toward the workpiece during the movement of the base (3).

10. The resistance welding apparatus (2) for automotive parts according to claim 1, characterized in that, The movement range of each slide (15) is matched with the driving coverage range of the corresponding driving avoidance mechanism so that the welding head can drive the base (3) to generate avoidance action when moving within the corresponding range.

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