Automated welding device for automotive parts and method thereof

Abstract

The application discloses an automatic welding device for automobile parts and a method thereof, which comprises a base and an automatic welding mechanism, wherein the welding mechanism comprises a control seat, a pressing cylinder, a convex die electrode and a concave die electrode; the top of the base is fixedly connected with an insulating round table; the outer part of the insulating round table is symmetrically provided with fixing mechanisms; the fixing mechanisms comprise U-shaped connecting rods A; the outer part of each U-shaped connecting rod A is rotatably connected with a rotating cylinder; the outer part of each rotating cylinder is fixedly connected with a fixing arm; the end of each fixing arm, which is in contact with a workpiece, is provided with an elastic anti-skid pad; the output end of the pressing cylinder is fixedly connected with a connecting sleeve; and the outer part of the connecting sleeve is symmetrically fixedly connected with L-shaped connecting rods and T-shaped connecting rods. In the application, the workpiece can be automatically fixed before resistance spot welding and can be released from the fixing after resistance spot welding, so that the situation that an operator is scalded by high-temperature metal liquid drops splashed during the welding of the workpiece can be prevented.

Description

Technical Field

[0001] This invention relates to the field of automotive parts welding technology, and in particular to an automated welding device and method for automotive parts. Background Technology

[0002] Automotive parts processing encompasses the various units that make up the entire automotive parts processing system and the products that serve this process. During automotive parts processing, it is often necessary to composite weld steel plates and aluminum alloy plates. Welding between steel plates and aluminum alloy plates is a type of welding between dissimilar materials. Welding between dissimilar materials can be performed using resistance spot welding. Resistance spot welding is a method that uses pressure applied by electrodes and utilizes the resistance heat generated by current passing through the contact surface and adjacent areas of the joint to achieve a connection. It is the main welding method for modern automotive parts.

[0003] A search revealed Chinese patent CN 110695507 B, which discloses a resistance spot welding machine. The machine includes a foot, a frame fixedly connected to the top of the foot, a clamping cylinder on the top of the frame, a base plate and a housing fixedly connected to the piston rod of the clamping cylinder, a control cabinet connected to the base plate via a conductive plate, a cylindrical punch electrode rotatably connected inside the housing, a partition plate inside the housing, a first gear on the upper part of the punch electrode, a motor fixedly connected to the partition plate, a second gear fixedly connected to the motor output shaft, the second gear meshing with the first gear, a worktable fixedly connected to the middle of the frame corresponding to the base plate, and a concave electrode mounted on the worktable, which engages with the punch electrode. Compared with existing technologies, this invention patent CN 110695507 B increases the conductivity of the thin plate to be welded by rotating and rubbing the punch electrode, thereby increasing the welding efficiency of the spot welding machine.

[0004] However, in actual use, the above-mentioned resistance spot welding machine requires the operator to hold the workpiece and fix it between the punch electrode and the die electrode for welding. When the operator holds the workpiece for welding, he is easily burned by the splashing high-temperature molten metal droplets. Therefore, there is a need for an automated welding device and method for automotive parts that can autonomously clamp the workpiece to prevent the operator from being burned. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies that require operators to hold the workpiece and fix it between the punch electrode and the die electrode for welding, which can easily result in burns from splattering high-temperature molten metal droplets. Therefore, this invention proposes an automated welding device and method for automotive parts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An automated welding device and method for automotive parts includes a base and an automated welding mechanism. The welding mechanism includes a control seat disposed on the top of the base, a clamping cylinder mounted outside the base, a punch electrode fixedly connected to the output end of the clamping cylinder, and a die electrode disposed on the top of the base. An insulating frustum located outside the die electrode is fixedly connected to the top of the base. A fixing mechanism for fixing workpieces is symmetrically arranged outside the insulating frustum. The fixing mechanism includes a U-shaped connecting rod A fixedly connected to the outside of the insulating frustum. A rotating cylinder is rotatably connected to the outside of the U-shaped connecting rod A. A fixing arm for fixing workpieces is fixedly connected to the outside of the rotating cylinder. An elastic anti-slip pad is provided at the end of the fixing arm that contacts the workpiece. A connecting sleeve is fixedly connected to the output end of the clamping cylinder. An L-shaped connecting rod and a T-shaped connecting rod are symmetrically fixedly connected to the outside of the connecting sleeve. A linkage mechanism that is linked with the L-shaped connecting rod and the T-shaped connecting rod is provided outside the rotating cylinder. A work station area is symmetrically arranged on the top of the base.

[0008] The above technical solution further includes:

[0009] The linkage mechanism includes mounting plates symmetrically fixedly connected to the top of the base and linkage gears fixedly connected to the ends of the L-shaped connecting rods. Fixed cylinders are fixedly connected to the sides of the two mounting plates that are close to each other. A linkage rod A is movably connected between the two fixed cylinders. A linkage gear that meshes with the linkage gear is fixedly connected to the middle of the linkage rod A. A linkage component A is symmetrically arranged on the outside of both the linkage rod A and the rotating cylinder. The linkage component A includes two linkage wheels fixedly connected to the outside of the linkage rod A and the outside of the rotating cylinder, respectively. A linkage belt is provided between the two linkage wheels. When the linkage gear drives the linkage gear to rotate, the linkage gear drives the linkage rod A to rotate, which in turn drives the rotating cylinder and the fixed arm to rotate via the linkage component A.

[0010] Both of the fixed cylinders are equipped with one-way limiting components to restrict the outward rotation of the linkage rod A. Each one-way limiting component includes four receiving grooves inside the fixed cylinder and four one-way limiting grooves outside the linkage rod A. One-way limiting blocks are slidably connected inside each of the four receiving grooves, and the four one-way limiting blocks extend into the interior of the four one-way limiting grooves. A return spring A is fixedly connected between each receiving groove and each one-way limiting block. When the linkage rod A rotates inward, the four one-way limiting grooves on its exterior will press the four one-way limiting blocks into the interior of the four receiving grooves.

[0011] The inner side of the mounting plate is provided with a release component for releasing the one-way limiting effect of the one-way limiting component. The release component includes a fixed plate fixedly connected to the inner side of the mounting plate. An annular groove is formed on the side of the fixed plate away from the mounting plate. Four connecting shafts A are slidably connected inside the annular groove. The ends of the four connecting shafts A away from the inside of the annular groove are all fixedly connected to a connecting ring. Four arc-shaped guide rails are fixedly fixedly connected to the inner side of the connecting ring. Connecting shafts B are movably connected inside the four arc-shaped guide rails. L-shaped release rods are fixedly connected to the ends of the four connecting shafts B away from the four arc-shaped guide rails. The four L-shaped release rods extend into the interior of the fixed cylinder and are respectively fixedly connected to the four one-way limiting blocks. Several connecting strips A are fixedly fixedly connected to the outer side of the connecting ring. Rotating the connecting ring outward will cause the four L-shaped release rods to move in mutually distancing directions.

[0012] The linkage mechanism further includes a linkage component B disposed at the end of the T-shaped connecting rod. The linkage component B includes a linkage rod B fixedly connected to the end of the T-shaped connecting rod. The linkage rod B has a rectangular groove evenly formed on the side near the connecting ring. A U-shaped connecting rod B is evenly fixedly connected to the outside of the linkage rod B. A connecting strip B that fits against the bottom wall of the rectangular groove is rotatably connected to the outside of the U-shaped connecting rod B. A return spring B is fixedly connected between each connecting strip B and each rectangular groove. When the linkage rod B moves upward and approaches the connecting ring, it will drive the connecting ring to rotate outward.

[0013] An automated welding method for automotive parts includes the following steps:

[0014] Step 1: After the two operators are positioned in the two workstations respectively, they place the workpiece on top of the die electrode and the insulating frustum, ensuring that the part of the workpiece to be welded is located in the center of the die electrode. If the workpiece is short and can be stably placed on top of the die electrode and the insulating frustum, the two operators need to leave the two workstations. If the workpiece is long and cannot be stably placed on top of the die electrode and the insulating frustum, the two operators need to remain inside the two workstations and hold the two ends of the workpiece.

[0015] Step 2: Subsequently, the clamping cylinder is activated via the control seat, causing the clamping cylinder to extend and drive the punch electrode downwards towards the die electrode. During the extension of the clamping cylinder, the linkage rack moves downwards via the L-shaped connecting rod and the linkage rod B moves downwards via the T-shaped connecting rod. The downward-moving linkage rack first drives the linkage gear to rotate inwards, causing the linkage rod A to drive the rotating cylinder to rotate inwards via the two external linkage components A. The rotating cylinder rotates inwards, causing the external fixed arm to rotate inwards. The downward-moving linkage rod B then drives several external connecting bars B to move downwards. While moving downwards, the several connecting bars B are also deflected upwards by the abutment of several external connecting bars A.

[0016] Step 3: After the rotating cylinder rotates inward and drives the fixed arm to rotate inward by 90 degrees and fixes the position of the workpiece, the linkage rack no longer meshes with the linkage gear, and the linkage rod A is limited by the one-way limiting components at both ends and cannot rotate. After this, the two operators in the two workstation areas need to exit. If there are no two operators temporarily remaining in the two workstation areas, the exit is ignored.

[0017] Step 4: Then, the control seat is used to energize the punch electrode and the die electrode, while the clamping cylinder continues to drive the punch electrode to cooperate with the die electrode to perform resistance spot welding on the workpiece.

[0018] Step 5: After the workpiece resistance spot welding is completed, the power to the punch electrode and the die electrode is cut off via the control seat. Simultaneously, the clamping cylinder shortens, causing the punch electrode to move upwards away from the die electrode. During the shortening process of the clamping cylinder, the L-shaped connecting rod drives the linkage rack upwards, and the T-shaped connecting rod drives the linkage rod B upwards. The upward-moving linkage rod B first drives several connecting bars B outside it upwards. These upward-moving connecting bars B then drive the connecting ring outwards via several connecting bars A. The outwardly rotating connecting ring then... The four arc-shaped guide rails and the four connecting shafts B drive the four L-shaped release rods to move away from each other. After the four L-shaped release rods drive the four one-way limiting blocks to disengage from the interior of the four one-way limiting grooves, the linkage rod B and the linkage rack continue to move upward. The connecting ring continues to rotate outward, and the four L-shaped release rods continue to move away from each other. After the upward-moving linkage rack meshes with the linkage gear, it will drive the linkage gear to rotate outward, so that the linkage rod A drives the rotating cylinder and the fixed arm to rotate outward and reset through the two external linkage parts A.

[0019] Step Six: After the clamping cylinder shortens and drives the linkage rack and linkage rod B to reset, several connecting bars B will disengage from several connecting bars A outside the connecting ring. The four reset springs A will drive the four one-way limit blocks to reset respectively. At the same time, the connecting ring and several connecting bars A outside it will reset, thus completing one resistance spot welding operation of the workpiece.

[0020] The present invention has the following beneficial effects:

[0021] When the clamping cylinder is activated to move the punch electrode downwards towards the die electrode, the two fixed arms can rotate inwards by 90 degrees and fix the position of the workpiece by the elastic anti-slip pads at their ends. When the clamping cylinder is activated to move the punch electrode upwards away from the die electrode, the four one-way limiting blocks can first disengage from the interior of the four one-way limiting grooves, and then the two fixed arms can rotate outwards by 90 degrees to reset. This allows the workpiece to be automatically fixed by the two fixed arms before resistance spot welding and to be released by the two fixed arms after resistance spot welding. This prevents the operator from being burned by splashing high-temperature molten metal droplets while holding the workpiece during welding. Attached Figure Description

[0022] Figure 1 This is a first structural schematic diagram of an automated welding device for automotive parts proposed in this invention;

[0023] Figure 2 This is a schematic diagram of the second structure of an automated welding device for automotive parts proposed in this invention;

[0024] Figure 3 This is a schematic diagram of the third structure of an automated welding device for automotive parts proposed in this invention;

[0025] Figure 4 This is a schematic diagram of the fourth structure of an automated welding device for automotive parts proposed in this invention;

[0026] Figure 5 This is a schematic diagram of the first structure of the linkage mechanism in this invention;

[0027] Figure 6 This is a schematic diagram of the second structure of the linkage mechanism in this invention;

[0028] Figure 7 This is a schematic diagram of the third structure of the linkage mechanism in this invention;

[0029] Figure 8 This is a schematic diagram of the fourth structure of the linkage mechanism in this invention.

[0030] In the diagram: 1. Base; 2. Automated welding mechanism; 21. Control seat; 22. Clamping cylinder; 23. Punch electrode; 24. Die electrode; 3. Insulating frustum; 4. Workpiece; 5. Fixing mechanism; 51. U-shaped connecting rod A; 52. Rotating cylinder; 53. Fixed arm; 54. Elastic anti-slip pad; 6. Connecting sleeve; 7. L-shaped connecting rod; 8. T-shaped connecting rod; 9. Linkage mechanism; 91. Mounting plate; 92. Linkage rack; 93. Fixed cylinder; 94. Linkage rod A; 95. Linkage gear; 96. Linkage component A; 961. Linkage wheel; 962. Linkage belt; 97. Single 971. Receiving groove; 972. One-way limiting groove; 973. One-way limiting block; 974. Return spring A; 98. Release assembly; 981. Fixed plate; 982. Annular slide; 983. Connecting shaft A; 984. Connecting ring; 985. Arc-shaped guide rail; 986. Connecting shaft B; 987. L-shaped release rod; 988. Connecting strip A; 99. Linkage component B; 991. Linkage rod B; 992. Rectangular groove; 993. U-shaped connecting rod B; 994. U-shaped connecting rod B; 995. Connecting strip B; 996. Return spring B; 10. Workstation area. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 scope of protection of the present invention.

[0032] like Figures 1-8 As shown, the present invention proposes an automated welding device for automotive parts, including a base 1 and an automated welding mechanism 2. The welding mechanism 2 includes a control seat 21 disposed on the top of the base 1, a clamping cylinder 22 installed outside the base 1, a punch electrode 23 fixedly connected to the output end of the clamping cylinder 22, and a die electrode 24 disposed on the top of the base 1. The control seat 21 can control the extension and retraction distance of the clamping cylinder 22 and the opening and closing of the punch electrode 23 and the die electrode 24.

[0033] An insulating frustum 3 located outside the die electrode 24 is fixedly connected to the top of the base 1. A fixing mechanism 5 for fixing the workpiece 4 is symmetrically arranged outside the insulating frustum 3. The fixing mechanism 5 includes a U-shaped connecting rod A51 fixedly connected to the outside of the insulating frustum 3. A rotating cylinder 52 is rotatably connected to the outside of the U-shaped connecting rod A51. A fixing arm 53 for fixing the workpiece 4 is fixedly connected to the outside of the rotating cylinder 52. An elastic anti-slip pad 54 is provided at one end of the fixing arm 53 that contacts the workpiece 4. When the two rotating cylinders 52 rotate inward at the same time, the elastic anti-slip pads 54 at the ends of the two fixing arms 53 can fix the workpiece 4.

[0034] A connecting sleeve 6 is fixedly connected to the output end of the pressing cylinder 22. An L-shaped connecting rod 7 and a T-shaped connecting rod 8 are symmetrically fixedly connected to the outside of the connecting sleeve 6. A linkage mechanism 9 that is linked with the L-shaped connecting rod 7 and the T-shaped connecting rod 8 is provided on the outside of the rotating cylinder 52. A work station area 10 is symmetrically provided on the top of the base 1.

[0035] The linkage mechanism 9 includes a mounting plate 91 symmetrically fixedly connected to the top of the base 1 and a linkage gear 92 fixedly connected to the end of the L-shaped connecting rod 7. A fixed cylinder 93 is fixedly connected to the side of the two mounting plates 91 that are close to each other. A linkage rod A94 is movably connected between the two fixed cylinders 93. A linkage gear 95 that meshes with the linkage gear 92 is fixedly connected to the middle of the linkage rod A94. A linkage component A96 is symmetrically arranged on the outside of the linkage rod A94 and the rotating cylinder 52. The linkage component A96 includes two linkage wheels 961 that are fixedly connected to the outside of the linkage rod A94 and the outside of the rotating cylinder 52, respectively. A linkage belt 962 is arranged between the two linkage wheels 961. When the linkage gear 92 drives the linkage gear 95 to rotate, the linkage gear 95 will drive the linkage rod A94 to rotate and drive the rotating cylinder 52 and the fixed arm 53 to rotate through the linkage component A96.

[0036] Both fixed cylinders 93 are equipped with one-way limiting components 97 for restricting the outward rotation of the linkage rod A94. The one-way limiting components 97 include four receiving grooves 971 inside the fixed cylinder 93 and four one-way limiting grooves 972 outside the linkage rod A94. One-way limiting blocks 973 are slidably connected inside the four receiving grooves 971. The four one-way limiting blocks 973 extend into the four one-way limiting grooves 972 respectively. A return spring A974 is fixedly connected between each receiving groove 971 and each one-way limiting block 973. When the linkage rod A94 rotates inward, the four one-way limiting grooves 972 outside it will squeeze the four one-way limiting blocks 973 into the four receiving grooves 971 respectively.

[0037] The inner side of the mounting plate 91 is provided with a release component 98 for releasing the one-way limiting function of the one-way limiting component 97. The release component 98 includes a fixed plate 981 fixedly connected to the inner side of the mounting plate 91. An annular groove 982 is formed on the side of the fixed plate 981 away from the mounting plate 91. Four connecting shafts A983 are slidably connected inside the annular groove 982. One end of the four connecting shafts A983 away from the inside of the annular groove 982 is fixedly connected to a connecting ring 984. Four arc-shaped rings are symmetrically fixedly connected to the inner side of the connecting ring 984. The four arc-shaped guide rails 985 are movably connected to the internal parts of each of the four arc-shaped guide rails 985. Each of the four connecting shafts B986 is fixedly connected to an L-shaped release rod 987 at the end away from the four arc-shaped guide rails 985. Each of the four L-shaped release rods 987 extends into the interior of the fixed cylinder 93 and is fixedly connected to four one-way limit blocks 973 respectively. Several connecting strips A988 are fixedly connected to the external axis of the connecting ring 984. When the connecting ring 984 rotates outward, it will drive the four L-shaped release rods 987 to move in a direction away from each other.

[0038] The linkage mechanism 9 also includes a linkage component B99 disposed at the end of the T-shaped connecting rod 8. The linkage component B99 includes a linkage rod B991 fixedly connected to the end of the T-shaped connecting rod 8. A rectangular groove 992 is evenly provided on the side of the linkage rod B991 near the connecting ring 984. A U-shaped connecting rod B993 is evenly fixedly connected to the outside of the linkage rod B991. A connecting strip B994 that fits against the inner bottom wall of the rectangular groove 992 is rotatably connected to the outside of the U-shaped connecting rod B993. A return spring B995 is fixedly connected between each connecting strip B994 and each rectangular groove 992. When the linkage rod B991 moves downward, the connecting ring 984 is not affected. When the linkage rod B991 moves upward and approaches the connecting ring 984, it will drive the connecting ring 984 to rotate outward.

[0039] In this embodiment: First, two operators are located in two workstation areas 10 respectively, and place the workpiece 4 on top of the die electrode 24 and the insulating frustum 3. At the same time, ensure that the part of the workpiece 4 to be welded is located in the middle of the die electrode 24. If the length of the workpiece 4 is small and can be placed stably on top of the die electrode 24 and the insulating frustum 3, the two operators need to leave the two workstation areas 10. If the length of the workpiece 4 is long and cannot be placed stably on top of the die electrode 24 and the insulating frustum 3, the two operators need to stay inside the two workstation areas 10 and hold the two ends of the workpiece 4.

[0040] Subsequently, the clamping cylinder 22 is activated via the control seat 21, causing the clamping cylinder 22 to extend and drive the punch electrode 23 downward toward the die electrode 24. During the extension of the clamping cylinder 22, the linkage rack 92 will move downward via the L-shaped connecting rod 7, and the linkage rod B991 will move downward via the T-shaped connecting rod 8. The downward moving linkage rack 92 will drive the linkage gear 95 to rotate inward, causing the linkage rod A94 to drive the rotating cylinder 52 to rotate inward via the two external linkage parts A96. The inward rotating cylinder 52 will drive the external fixed arm 53 to rotate inward. The downward moving linkage rod B991 will drive several external connecting bars B994 to move downward, but the position of the connecting ring 984 is not affected.

[0041] After the rotating cylinder 52 rotates inward, it drives the fixed arm 53 to rotate inward by 90 degrees and fixes the position of the workpiece 4. At this time, the linkage rack 92 no longer meshes with the linkage gear 95, and the linkage rod A94 is limited by the one-way limiting components 97 at both ends and cannot rotate. After this, the two operators inside the two workstation areas 10 need to exit. If there are no two operators temporarily remaining inside the two workstation areas 10, the exit is ignored.

[0042] Subsequently, the punch electrode 23 and the die electrode 24 are energized through the control seat 21, while the clamping cylinder 22 continues to drive the punch electrode 23 to cooperate with the die electrode 24 to perform resistance spot welding on the workpiece 4.

[0043] After the resistance spot welding of workpiece 4 is completed, the power to the punch electrode 23 and the die electrode 24 is cut off by controlling the control seat 21. At the same time, the clamping cylinder 22 shortens, causing the punch electrode 23 to move upward away from the die electrode 24. During the shortening process of the clamping cylinder 22, the linkage rod 92 will move upward through the L-shaped connecting rod 7, and the linkage rod B991 will move upward through the T-shaped connecting rod 8. The upward movement of the linkage rod B991 will cause several connecting bars B994 outside it to move upward. The upward movement of several connecting bars B994 will cause the connecting ring 984 to rotate outward through several connecting bars A988. The outward rotation of the connecting ring 984 will cause the connecting ring 984 to rotate outward through four arc-shaped... The guide rail 985 and the four connecting shafts B986 drive the four L-shaped release rods 987 to move away from each other. After the four L-shaped release rods 987 respectively drive the four one-way limit blocks 973 to disengage from the interior of the four one-way limit grooves 972, the linkage rod B991 and the linkage rack 92 continue to move upward, the connecting ring 984 continues to rotate outward, and the four L-shaped release rods 987 continue to move away from each other. After the upward-moving linkage rack 92 meshes with the linkage gear 95, it will drive the linkage gear 95 to rotate outward, so that the linkage rod A94 drives the rotating cylinder 52 and the fixed arm 53 to rotate outward and reset through the two external linkage parts A96.

[0044] After the clamping cylinder 22 shortens and drives the linkage rack 92 and linkage rod B991 to reset, several connecting bars B994 will disengage from several connecting bars A988 outside the connecting ring 984. The four reset springs A974 will drive the four one-way limit blocks 973 to reset respectively. At the same time, the connecting ring 984 and several connecting bars A988 outside it will reset. In this way, the resistance spot welding operation of workpiece 4 can be completed.

[0045] When the clamping cylinder 22 is activated to move the punch electrode 23 downward toward the die electrode 24, the two fixed arms 53 can rotate inward by 90 degrees and fix the position of the workpiece 4 through the elastic anti-slip pads 54 at their ends. When the clamping cylinder 22 is activated to move the punch electrode 23 upward away from the die electrode 24, the four one-way limiting blocks 973 can first disengage from the interior of the four one-way limiting grooves 972, and then the two fixed arms 53 can rotate outward by 90 degrees to reset. This allows the workpiece 4 to be automatically fixed by the two fixed arms 53 before resistance spot welding and to be released from fixation by the two fixed arms 53 after resistance spot welding. This prevents the operator from being burned by the splashing high-temperature molten metal droplets when holding the workpiece 4 during welding.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automated welding device for automotive parts, comprising a base (1) and an automated welding mechanism (2), wherein the welding mechanism (2) comprises a control seat (21) disposed on the top of the base (1), a clamping cylinder (22) mounted outside the base (1), a punch electrode (23) fixedly connected to the output end of the clamping cylinder (22), and a die electrode (24) disposed on the top of the base (1), characterized in that: An insulating frustum (3) located outside the die electrode (24) is fixedly connected to the top of the base (1). A fixing mechanism (5) for fixing the workpiece (4) is symmetrically arranged outside the insulating frustum (3). The fixing mechanism (5) includes a U-shaped connecting rod A (51) fixedly connected to the outside of the insulating frustum (3). A rotating cylinder (52) is rotatably connected to the outside of the U-shaped connecting rod A (51). A fixing arm (53) for fixing the workpiece (4) is fixedly connected to the outside of the rotating cylinder (52). An elastic anti-slip pad (54) is provided at one end of the fixing arm (53) that contacts the workpiece (4). The output end of the pressing cylinder (22) is fixedly connected to a connecting sleeve (6), and the connecting sleeve (6) is symmetrically fixedly connected to an L-shaped connecting rod (7) and a T-shaped connecting rod (8). The rotating cylinder (52) is provided with a linkage mechanism (9) that is linked to the L-shaped connecting rod (7) and the T-shaped connecting rod (8). The top of the base (1) is symmetrically provided with a work area (10). The linkage mechanism (9) includes a mounting plate (91) symmetrically fixedly connected to the top of the base (1) and a linkage gear (92) fixedly connected to the end of the L-shaped connecting rod (7). The two mounting plates (91) are fixedly connected to a fixed cylinder (93) on the side close to each other. A linkage rod A (94) is movably connected between the two fixed cylinders (93). A linkage gear (95) that meshes with the linkage gear (92) is fixedly connected to the middle of the linkage rod A (94). A linkage component A (96) is symmetrically arranged on the outside of the linkage rod A (94) and the rotating cylinder (52). The linkage component A (96) includes two linkage wheels (961) fixedly connected to the outside of the linkage rod A (94) and the outside of the rotating cylinder (52), respectively. A linkage belt (962) is arranged between the two linkage wheels (961). Both of the fixed cylinders (93) are provided with a one-way limiting component (97) for limiting the outward rotation of the linkage rod A (94). The one-way limiting component (97) includes four receiving grooves (971) opened inside the fixed cylinder (93) and four one-way limiting grooves (972) opened outside the linkage rod A (94). One-way limiting blocks (973) are slidably connected inside the four receiving grooves (971). The four one-way limiting blocks (973) extend into the four one-way limiting grooves (972). A return spring A (974) is fixedly connected between each receiving groove (971) and each one-way limiting block (973). The inner side of the mounting plate (91) is provided with a release component (98) for releasing the one-way limiting function of the one-way limiting component (97). The release component (98) includes a fixed plate (981) fixedly connected to the inner side of the mounting plate (91). An annular groove (982) is provided on the side of the fixed plate (981) away from the mounting plate (91). Four connecting shafts A (983) are slidably connected inside the annular groove (982). One end of the four connecting shafts A (983) away from the inside of the annular groove (982) is fixedly connected to a connecting ring (984). The inner side of the connecting ring (984) is symmetrically fixedly connected to four arc-shaped guide rails (985). The interior of each of the four arc-shaped guide rails (985) is movably connected to a connecting shaft B (986). The end of each of the four connecting shafts B (986) away from the four arc-shaped guide rails (985) is fixedly connected to an L-shaped release rod (987). The four L-shaped release rods (987) extend into the interior of the fixed cylinder (93) and are respectively fixedly connected to the four one-way limiting blocks (973). The outer side of the connecting ring (984) is symmetrically fixedly connected to several connecting strips A (988). The linkage mechanism (9) further includes a linkage component B (99) disposed at the end of the T-shaped connecting rod (8). The linkage component B (99) includes a linkage rod B (991) fixedly connected to the end of the T-shaped connecting rod (8). A rectangular groove (992) is evenly provided on the side of the linkage rod B (991) near the connecting ring (984). A U-shaped connecting rod B (993) is evenly fixedly connected to the outside of the linkage rod B (991). A connecting strip B (994) that fits against the inner bottom wall of the rectangular groove (992) is rotatably connected to the outside of the U-shaped connecting rod B (993). A return spring B (995) is fixedly connected between each connecting strip B (994) and each rectangular groove (992).

2. An automated welding method for automotive parts, implemented according to the automated welding device for automotive parts as described in claim 1, characterized in that: Includes the following steps: Step 1: After the two operators are positioned in the two workstations (10), they place the workpiece (4) on top of the die electrode (24) and the insulating frustum (3), and ensure that the part of the workpiece (4) to be welded is located in the middle of the die electrode (24). If the length of the workpiece (4) is small and can be placed stably on top of the die electrode (24) and the insulating frustum (3), the two operators need to leave the two workstations (10). If the length of the workpiece (4) is long and cannot be placed stably on top of the die electrode (24) and the insulating frustum (3), the two operators need to stay inside the two workstations (10) and hold the two ends of the workpiece (4). Step 2: Subsequently, the clamping cylinder (22) is activated via the control seat (21), causing the clamping cylinder (22) to extend and drive the punch electrode (23) downward toward the die electrode (24). During the extension of the clamping cylinder (22), the linkage rack (92) will move downward via the L-shaped connecting rod (7), and the linkage rod B (991) will move downward via the T-shaped connecting rod (8). The downward-moving linkage rack (92) will drive the linkage gear (95) to rotate inward, causing... The linkage rod A (94) drives the rotating cylinder (52) to rotate inward through the two external linkage parts A (96). The rotating cylinder (52) rotating inward will drive the external fixed arm (53) to rotate inward. The linkage rod B (991) moving downward will drive the external connecting bars B (994) to move downward. While the connecting bars B (994) are moving downward, they will also be abutted by the external connecting bars A (988) of the connecting ring (984) and deflected upward. Step 3: After the rotating cylinder (52) rotates inward and drives the fixed arm (53) to rotate inward by 90 degrees and fixes the position of the workpiece (4), the linkage rack (92) no longer meshes with the linkage gear (95), and the linkage rod A (94) is limited by the one-way limiting components (97) at both ends and cannot rotate. After this, the two operators inside the two workstations (10) need to exit. If no two operators remain inside the two workstations (10), the exit is ignored. Step 4: Then, the punch electrode (23) and the die electrode (24) are energized through the control seat (21), while the clamping cylinder (22) continues to drive the punch electrode (23) to cooperate with the die electrode (24) to perform resistance spot welding on the workpiece (4); Step 5: After the resistance spot welding of workpiece (4) is completed, the power to the punch electrode (23) and the die electrode (24) is cut off by the control seat (21). At the same time, the clamping cylinder (22) shortens, causing the punch electrode (23) to move upward away from the die electrode (24). During the shortening process of the clamping cylinder (22), the linkage rack (92) will move upward through the L-shaped connecting rod (7), and the linkage rod B (991) will move upward through the T-shaped connecting rod (8). The upward-moving linkage rod B (991) will cause several connecting bars B (994) outside it to move upward. The upward-moving connecting bars B (994) will cause several connecting bars B (994) outside it to move upward. The upward-moving connecting bars B (994) will cause the connecting ring (984) to rotate outward through several connecting bars A (988). The outward-rotating connecting ring (984) will cause four The arc-shaped guide rail (985) and the four connecting shafts B (986) drive the four L-shaped release rods (987) to move away from each other. After the four L-shaped release rods (987) drive the four one-way limiting blocks (973) to disengage from the interior of the four one-way limiting grooves (972), the linkage rod B (991) and the linkage rack (92) continue to move upward. The connecting ring (984) continues to rotate outward. The four L-shaped release rods (987) continue to move away from each other. After the upward-moving linkage rack (92) meshes with the linkage gear (95), it will drive the linkage gear (95) to rotate outward, so that the linkage rod A (94) drives the rotating cylinder (52) and the fixed arm (53) to rotate outward and reset through the two linkage parts A (96) outside it. Step 6: After the clamping cylinder (22) shortens and drives the linkage rack (92) and the linkage rod B (991) to reset, several connecting bars B (994) will disengage from several connecting bars A (988) outside the connecting ring (984). The four reset springs A (974) will drive the four one-way limit blocks (973) to reset respectively. At the same time, the connecting ring (984) and several connecting bars A (988) outside it will reset. In this way, the resistance spot welding operation of the workpiece (4) can be completed.

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