An automatic welding machine for automobile parts

Abstract

The application belongs to the field of welding, in particular to an automatic welding machine for automobile accessories, comprising a resistance spot welding gun, an outer sleeve is arranged outside the resistance spot welding gun, the resistance spot welding gun comprises an upper clamping arm and a lower clamping arm capable of opening and closing, an electrode rod is mounted at the end of the upper clamping arm and the lower clamping arm, a detachable electrode tip is mounted at the end of the electrode rod, a replacement wheel capable of translating and rotating is arranged outside the outer sleeve, a plurality of dismounting sleeves for dismounting the electrode tip are mounted in the replacement wheel; through the arrangement, full-automatic dismounting and replacement functions of the electrode tip are realized, the electrode tip can be replaced during a hollow period after long-term work; the electrode tip with different contact areas can also be replaced, so as to change the spot welding area, improve the automation level of the welding equipment, and realize a full-automatic high-quality welding process.

Description

Technical Field

[0001] The invention belongs to the field of welding, in particular to an automatic welding machine for automobile parts. Background Art

[0002] Automatic welding of automotive parts is an indispensable part of modern automobile manufacturing. It improves production efficiency, welding quality and product consistency through highly automated and precisely controlled welding processes.

[0003] Automatic welding of automotive parts generally uses a multi-axis robotic arm and resistance spot welding equipment to perform pressure spot welding on the parts that need to be welded. However, automotive parts are often large in size and require more welding points. The high temperature generated during the welding process will cause thermal expansion and softening of the electrode material. The frequent contact and separation between the electrode and the workpiece will generate mechanical friction, causing the electrode surface material to gradually wear. Deformed and damaged electrodes will affect the quality of spot welding and the overall quality of the car, so the electrodes need to be replaced regularly. At the same time, different locations on the car require different spot welding areas. Large-area spot welding is used for large areas such as car doors, while some corners are difficult to use large-area spot welding electrodes.

[0004] However, the electrodes of traditional welding equipment are difficult to replace, or the replacement process requires manual operation by the operator, resulting in a low degree of automation in the overall process, which is not conducive to the rapid welding production process of automobiles.

[0005] To this end, the present invention provides an automatic welding machine for automobile parts. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: an automatic welding machine for automobile parts according to the present invention includes a resistance spot welding gun, an outer sleeve is provided on the outer side of the resistance spot welding gun, the resistance spot welding gun includes an upper clamping arm and a lower clamping arm that can be opened and closed, the ends of the upper clamping arm and the lower clamping arm are both installed with electrode rods, the ends of the electrode rods are installed with electrode heads that can be detached, the outer side of the outer sleeve is provided with a replacement wheel that can be translated and rotated, and the replacement wheel is installed with a plurality of disassembly sleeves for disassembling and detaching the electrode heads;

[0008] By setting the replacement wheel, the multi-axis robot arm is connected to the outer sleeve, and the resistance spot welding gun is controlled to move to the position where welding is required. The upper clamping arm is controlled to rotate upward and the lower clamping arm is opened and kept stationary, and then closed again, so that the electrode head at the end of the electrode rod is squeezed to the position where spot welding is required. Spot welding is completed after power is turned on. The welding of automobile parts is generally cyclical. After welding a car, there will be a period of idle time for transporting new automobile parts. During this period, the replacement wheel is controlled to move between the upper clamping arm and the lower clamping arm. During the movement, the upper clamping arm and the lower clamping arm are rotated outward and opened. After the replacement wheel moves into place, the upper clamping arm is controlled to rotate back to its position, and the upper clamping arm drives the electrode rod to insert the electrode head into the disassembly sleeve. In the process, the electrode head is disassembled through the disassembly sleeve, and then the upper clamping arm is rotated upward, and the replacement wheel is rotated at the same time to rotate the other disassembly sleeve with a new electrode head placed thereon to the bottom of the upper clamping arm. Then the lower clamping arm drives the electrode rod to rotate, so that the electrode rod and the electrode head are docked, and then the two are installed through the disassembly sleeve; repeat the above operation to replace the electrode head of the lower clamping arm. Through this setting, the fully automatic disassembly and replacement function of the electrode head is realized, and the electrode head can be replaced during a hollow period after long-term work; it can also be used to replace electrode heads with different contact areas, thereby changing the spot welding area, improving the automation level of the welding equipment, and realizing a fully automatic high-quality welding process.

[0009] Preferably, a rotating table is fixedly connected to the outer side of the outer sleeve, and a side motor for driving the replacing wheel to rotate is installed on the outer side of the replacing wheel. A metal frame is fixedly connected to the rotating end of the rotating table and the outer side of the side motor. The rotating table is installed on the outer side of the outer sleeve, and the rotating table drives the metal frame, the side motor and the entire replacing wheel to adjust their positions, so that the replacing wheel is moved to the position for replacing the electrode head. When the replacing wheel is not in use, the replacing wheel is kept away from the upper clamping arm and the lower clamping arm so as not to affect normal welding work.

[0010] The top of the support frame is fixed with a rear support arm, and the top of the support frame is fixed with an electric telescopic rod, and a connecting shaft is installed between the electric telescopic rod and the top of the rotating arm. The center frame, the rear support arm and the support frame serve as the core supporting structure, and the extension and shortening of the electric telescopic rod cooperates with the connecting shaft to complete the stable rotation process of the upper clamping arm and the rotating arm. In the welding process, generally only the upper clamping arm is controlled to open and close, and the lower clamping arm remains stationary, reducing the difficulty of regulation. The reduction motor is used to drive the lower clamping arm to rotate and move when the electrode head of the lower clamping arm is replaced. The design of the overall resistance spot welding gun is simple and firm, and various operations can be performed stably to ensure a long service life of the equipment.

[0011] Preferably, a plurality of thread grooves extending to the bottom are provided on the top surface of the replacement wheel, and the plurality of thread grooves are arranged in a circular shape and at equal intervals. The thread of the disassembly sleeve is connected to the thread groove, and a grab valve for fixing the disassembly sleeve is installed inside the disassembly sleeve. An electric wheel for driving the disassembly sleeve to rotate is provided inside the replacement wheel, and the disassembly sleeve is threadedly connected to the thread groove. The lifting and lowering of the disassembly sleeve can be controlled by changing the rotation direction. When replacing the electrode head of the upper clamping arm, as the electrode head is inserted into the disassembly sleeve, the electrode head is fixed by the grab valve, and then the disassembly sleeve and the electrode head are driven to rotate together by the electric wheel, so that the electrode head is removed from the electrode rod and remains in the replacement wheel, thereby taking away the old electrode head and allowing the new electrode head to move to the electrode rod position, and controlling the disassembly sleeve to move upward, and the new electrode head is installed on the electrode rod to complete the disassembly and assembly work.

[0012] Preferably, the side motor is slidably engaged with the outer side of the replacement wheel, and a transmission box for transmitting power is installed between the top output end of the side motor and the middle of the top surface of the replacement wheel. A transmission belt can be used inside the transmission box to transmit the power of the side motor to the replacement wheel, thereby driving the replacement wheel to rotate. Since the side motor is fixed by the metal frame and slidably engaged with the outer side of the replacement wheel, a stable rotation process of the replacement wheel can be ensured.

[0013] Preferably, a hollow groove is provided at the bottom of the replacement wheel, the electric wheel is located in the hollow groove, the electric wheel is horizontally arranged, and the outer surfaces of the electric wheel and the disassembly and assembly sleeve are fixedly connected with a plurality of magnets arranged in a ring, so as to form a magnetic coupling effect, and a bending frame is fixedly connected between the bottom of the electric wheel and the side motor. When the replacement wheel is rotating, the internal electric wheel remains stationary. When it is necessary to drive the disassembly and assembly sleeve to rotate, the electric wheel is started to rotate, and the nearest disassembly and assembly sleeve is driven to rotate under the action of magnetic coupling. When the disassembly and assembly sleeve completes the work, the replacement wheel rotates, allowing the other disassembly and assembly sleeve to rotate to the position closest to the electric wheel, and the electrode head is disassembled or installed. Through this arrangement, not only the function of contactless driving of the disassembly and assembly sleeve to rotate is realized, thereby ensuring that the disassembly and assembly sleeve can stably perform the process of up and down thread movement during rotation, but also one electric wheel can control the rotation process of all disassembly and assembly sleeves, reducing the difficulty of operation.

[0014] Preferably, a horizontally arranged electric slide rail is fixed to the top of the bending frame, and the movable end of the electric slide rail is connected to the electric wheel. The electric slide rail can be used to control the electric wheel to fit the disassembly sleeve when transmission is required. When the replacement wheel rotates, it stays away from the disassembly sleeve to reduce the influence of magnetic attraction during rotation.

[0015] Preferably, the grabbing valves are divided into two groups, and the two groups of grabbing valves are respectively located at the upper end and the bottom end of the inner wall of the disassembly sleeve. The multiple grabbing valves in each group are arranged in a circular and equidistant manner. The two groups of grabbing valves are located at the upper and lower ends, so that the upper and lower electrode heads can be grabbed smoothly. The multiple grabbing valves arranged in a circular manner can ensure the firmness of the grabbing.

[0016] Preferably, the bottom of the electrode rod is fixed with a plug-in threaded bolt, and the end of the electrode head is provided with a docking hole adapted to the plug-in threaded bolt. Through the arrangement of the plug-in threaded bolt and the docking hole, after the electrode head and the electrode rod are aligned and inserted, the rotation of the disassembly sleeve can effectively drive the electrode head to rotate and move, so that it is effectively docked and tightened with the electrode rod, and finally the gripping valve is released to allow the electrode head to be stably installed; at the same time, the electromagnetic transmission method, when tightening the electrode head, the rotational output force of the electric wheel remains unchanged, and the spiral tightening force can still be slowly applied to the disassembly sleeve to ensure the fixed installation of the electrode head. The disassembly process is the same, ensuring the smooth tightening and disassembly.

[0017] Preferably, the rear end of the external sleeve is fixed with a connecting plate, and a disassembly and assembly box is provided on the outside of the external sleeve. The front end of the disassembly and assembly box is provided with a replacement groove adapted to the shape of the replacement wheel, and the external sleeve is fixedly connected to equipment such as a multi-axis robotic arm through the connecting plate; the replacement groove of the disassembly and assembly box is adapted to the thickness of the replacement wheel, and is used to receive the replaced electrode head and place the new electrode head into the disassembly and assembly sleeve at the same time.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The automatic welding machine for automobile parts described in the present invention realizes the function of fully automatic disassembly and replacement of the electrode head through the setting of the replacement wheel. The electrode head can be replaced during a hollow period after long-term work. It can also be used to replace electrode heads with different contact areas, thereby changing the spot welding area, thereby improving the automation level of the welding equipment and realizing a fully automatic high-quality welding process.

[0020] 2. The automatic welding machine for automobile parts described in the present invention uses a center frame, a rear support arm and a support frame as the core support structure. The upper clamping arm and the rotating arm are stably rotated by the extension and contraction of the electric telescopic rod in cooperation with the connecting shaft. During the welding process, generally only the upper clamping arm is controlled to open and close, and the lower clamping arm remains stationary, reducing the difficulty of regulation. Only when the electrode head of the lower clamping arm is replaced, the reduction motor is used to drive the lower clamping arm to rotate and move. The overall resistance spot welding gun is simple and sturdy in design, can stably perform various operations, and ensure a long service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a perspective view of the present invention;

[0023] Figure 2 It is a three-dimensional diagram of the outer sleeve of the present invention;

[0024] Figure 3 is a perspective view of a resistance spot welding gun of the present invention;

[0025] Figure 4 is a perspective view of the upper clamping arm and the lower clamping arm of the present invention;

[0026] Figure 5 is a perspective view of the replacement wheel and upper clamping arm of the present invention;

[0027] Figure 6 It is a three-dimensional diagram of the replacement wheel and the disassembly and assembly sleeve of the present invention;

[0028] Figure 7 is a cross-sectional view of the replacement wheel of the present invention;

[0029] In the figure: 1. Resistance spot welding gun; 2. External sleeve; 3. Rotating table; 4. Replacement wheel; 5. Disassembly and assembly box; 6. Connecting plate; 7. Center frame; 8. Rear support arm; 9. Electric telescopic rod; 10. Rotating arm; 11. Connecting shaft; 12. Upper clamping arm; 13. Lower clamping arm; 14. Support frame; 15. Electrode rod; 16. Side motor; 17. Transmission box; 18. Disassembly and assembly sleeve; 19. Bending frame; 20. Electric slide rail; 21. Electric wheel; 22. Grabbing valve; 23. Hollow groove; 24. Insert threaded bolt; 25. Electrode head. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0031] like Figures 1 to 7 As shown, an automatic welding machine for automobile parts according to an embodiment of the present invention includes a resistance spot welding gun 1, an outer sleeve 2 is provided on the outside of the resistance spot welding gun 1, and the resistance spot welding gun 1 includes an upper clamping arm 12 and a lower clamping arm 13 that can be opened and closed, and an electrode rod 15 is installed at the end of the upper clamping arm 12 and the lower clamping arm 13, and an electrode head 25 that can be disassembled is installed at the end of the electrode rod 15. A replacement wheel 4 that can be translated and rotated is provided on the outside of the outer sleeve 2, and a plurality of disassembly sleeves 18 for disassembling and assembling the electrode head 25 are installed in the replacement wheel 4.

[0032] By setting the replacement wheel 4, the multi-axis robot arm is connected to the outer sleeve 2, and the resistance spot welding gun 1 is controlled to move to the position where welding is required. The upper clamping arm 12 is controlled to rotate upward to open the lower clamping arm 13 and keep it stationary, and then close it, so that the electrode head 25 at the end of the electrode rod 15 is squeezed to the position where spot welding is required, and the spot welding is completed after power is turned on. The welding of automobile parts is generally cyclical. After welding a car, there will be a hollow period for transporting new automobile parts. During this period, the replacement wheel 4 is controlled to move between the upper clamping arm 12 and the lower clamping arm 13. During the movement, the upper clamping arm 12 and the lower clamping arm 13 rotate outward and open. After the replacement wheel 4 moves into place, the upper clamping arm 12 is controlled to rotate back to its position, and the upper clamping arm 12 drives the electrode rod 15 to insert the electrode head 25 into the disassembly sleeve 18 , the electrode head 25 is disassembled through the disassembly sleeve 18, and then the upper clamping arm 12 is rotated upward, and the replacement wheel 4 is rotated at the same time, and the other disassembly sleeve 18 with a new electrode head 25 is rotated to the bottom of the upper clamping arm 12, and then the lower clamping arm 13 drives the electrode rod 15 to rotate, so that the electrode rod 15 and the electrode head 25 are docked, and then the two are installed through the disassembly sleeve 18; repeat the above operation to replace the electrode head 25 of the lower clamping arm 13. Through this setting, the fully automatic disassembly and replacement function of the electrode head 25 is realized, and the electrode head 25 can be replaced during a hollow period after long-term work; it can also be used to replace electrode heads 25 with different contact areas, thereby changing the spot welding area, improving the automation level of the welding equipment, and realizing a fully automatic high-quality welding process.

[0033] The outer side of the outer sleeve 2 is fixedly connected to a rotating platform 3, and the outer side of the replacement wheel 4 is installed with a side motor 16 for driving the replacement wheel 4 to rotate. The rotating end of the rotating platform 3 and the outer side of the side motor 16 are fixedly connected with a metal frame;

[0034] During operation, the rotating table 3 installed on the outside of the outer sleeve 2 drives the metal frame, the side motor 16 and the integral replacement wheel 4 to adjust their positions, so that the replacement wheel 4 is moved to the position of replacing the electrode head 25. When the replacement wheel 4 is not in use, the replacement wheel 4 is kept away from the upper clamping arm 12 and the lower clamping arm 13 so as not to affect normal welding work.

[0035] The resistance spot welding gun 1 includes a center frame 7, a support frame 14 is fixedly connected to the front end of the center frame 7, a reduction motor is fixedly connected to the middle part of the support frame 14, the rotating end of the reduction motor is fixedly connected to the end of the lower clamping arm 13, an electromagnetic buckle for clamping the lower clamping arm 13 is installed inside the support frame 14, a rotating arm 10 is rotatably connected to the upper part of the support frame 14, the upper clamping arm 12 is fixedly connected to the rotating arm 10, the rear end of the center frame 7 is fixedly connected to the rear support arm 8, the top of the rear support arm 8 is fixedly connected to the electric telescopic rod 9, and a connecting shaft 11 is installed between the electric telescopic rod 9 and the top of the rotating arm 10;

[0036] During operation, the center frame 7, the rear support arm 8 and the support frame 14 serve as the core support structure. The upper clamping arm 12 and the rotating arm 10 are stably rotated by the extension and contraction of the electric telescopic rod 9 in cooperation with the connecting shaft 11. In the welding process, generally only the upper clamping arm 12 is controlled to open and close, and the lower clamping arm 13 remains stationary to reduce the difficulty of regulation. Only when the electrode head 25 of the lower clamping arm 13 is replaced, the reduction motor is used to drive the lower clamping arm 13 to rotate and move. The overall design of the resistance spot welding gun 1 is simple and firm, and various operations can be performed stably to ensure a long service life of the equipment.

[0037] The top surface of the replacement wheel 4 is provided with a plurality of thread grooves extending to the bottom thereof, and the plurality of thread grooves are arranged in an annular pattern with equal spacing. The threads of the disassembly sleeve 18 are connected to the thread grooves. A grab valve 22 for fixing the disassembly sleeve 18 is installed inside the disassembly sleeve 18. An electric wheel 21 for driving the disassembly sleeve 18 to rotate is provided inside the replacement wheel 4.

[0038] During operation, the disassembly sleeve 18 is threadedly connected to the thread groove, and the lifting and lowering of the disassembly sleeve 18 can be controlled by changing the rotation direction. When replacing the electrode head 25 of the upper clamping arm 12, as the electrode head 25 is inserted into the disassembly sleeve 18, the electrode head 25 is fixed by the grab valve 22, and then the disassembly sleeve 18 and the electrode head 25 are driven to rotate together by the electric wheel 21, so that the electrode head 25 is removed from the electrode rod 15 and remains in the replacement wheel 4, thereby taking away the old electrode head 25 and allowing the new electrode head 25 to move to the position of the electrode rod 15, and controlling the disassembly sleeve 18 to move upward, and the new electrode head 25 is installed on the electrode rod 15 to complete the disassembly and assembly work.

[0039] The side motor 16 is slidably engaged with the outer side of the replacement wheel 4, and a transmission box 17 for transmitting power is installed between the top output end of the side motor 16 and the middle of the top surface of the replacement wheel 4;

[0040] During operation, a transmission belt can be used inside the transmission box 17 to transmit the power of the side motor 16 to the replacement wheel 4, thereby driving the replacement wheel 4 to rotate. Since the side motor 16 is fixed by the metal frame and is slidingly engaged with the outer side of the replacement wheel 4, the stable rotation process of the replacement wheel 4 can be ensured.

[0041] A hollow groove 23 is formed at the bottom of the replacement wheel 4, and the electric wheel 21 is located in the hollow groove 23. The electric wheel 21 is arranged horizontally. The outer surfaces of the electric wheel 21 and the disassembly sleeve 18 are fixedly connected with multiple magnets arranged in an annular shape, thereby forming a magnetic coupling effect. A bending frame 19 is fixedly connected between the bottom of the electric wheel 21 and the side motor 16;

[0042] During operation, when the replacement wheel 4 is rotating, the internal electric wheel 21 remains stationary. When it is necessary to drive the disassembly and assembly sleeve 18 to rotate, the electric wheel 21 is started to rotate, and the closest disassembly and assembly sleeve 18 is driven to rotate under the action of magnetic coupling. When the disassembly and assembly sleeve 18 completes the work, the replacement wheel 4 rotates to allow the other disassembly and assembly sleeve 18 to rotate to the position closest to the electric wheel 21 to perform the disassembly or installation of the electrode head 25. Through this setting, not only the function of contactless driving of the disassembly and assembly sleeve 18 to rotate is realized, thereby ensuring that the disassembly and assembly sleeve 18 can stably perform the process of up and down thread movement during rotation, but also one electric wheel 21 can control the rotation process of all disassembly and assembly sleeves 18, reducing the difficulty of operation.

[0043] A horizontally arranged electric slide rail 20 is fixed to the top of the bending frame 19, and the moving end of the electric slide rail 20 is connected to the electric wheel 21;

[0044] During operation, the electric slide rail 20 can be used to control the electric wheel 21 to fit the disassembly sleeve 18 when transmission is required. When the replacement wheel 4 rotates, it stays away from the disassembly sleeve 18 to reduce the influence of magnetic attraction during rotation.

[0045] The grab valves 22 are divided into two groups. The two groups of grab valves 22 are respectively located at the upper end and the bottom end of the inner wall of the disassembly sleeve 18. The multiple grab valves 22 in each group are arranged in a circular and equidistant manner.

[0046] During operation, two groups of grabbing valves 22 are located at the upper and lower ends, so that the upper and lower electrode heads 25 can be grabbed smoothly. The multiple grabbing valves 22 arranged in a ring can ensure the firmness of the grabbing.

[0047] The bottom of each electrode rod 15 is fixed with a plug-in threaded bolt 24, and the end of each electrode head 25 is provided with a docking hole adapted to the plug-in threaded bolt 24;

[0048] During operation, by inserting the threaded bolt 24 and the setting of the docking hole, the electrode head 25 and the electrode rod 15 are aligned and inserted. As the disassembly and assembly sleeve 18 rotates, the electrode head 25 can be effectively driven to rotate and move, so that it is effectively docked with the electrode rod 15 and tightened. Finally, the fixation of the grab valve 22 is released, so that the electrode head 25 can be stably installed. At the same time, the electromagnetic transmission method, when tightening the electrode head 25, the rotation output force of the electric wheel 21 remains unchanged, and the spiral tightening force can still be slowly applied to the disassembly and assembly sleeve 18, to ensure the fixed installation of the electrode head 25. The disassembly process is the same, ensuring smooth tightening and disassembly.

[0049] The rear end of the outer sleeve 2 is fixed with a connecting plate 6, and the outer side of the outer sleeve 2 is provided with a disassembly box 5, and the front end of the disassembly box 5 is provided with a replacement slot that matches the shape of the replacement wheel 4;

[0050] During operation, the external sleeve 2 is fixedly connected to equipment such as a multi-axis robotic arm through the connecting plate 6; the replacement slot of the disassembly and assembly box 5 is adapted to the thickness of the replacement wheel 4, and is used to receive the replaced electrode head 25 while placing the new electrode head 25 into the disassembly and assembly sleeve 18.

[0051] During operation, the multi-axis robot arm is connected to the outer sleeve 2 through the setting of the replacement wheel 4, and the resistance spot welding gun 1 is controlled to move to the position where welding is required. The lower clamping arm 13 is opened by controlling the upper clamping arm 12 to rotate upward and remain stationary, and then closed again, so that the electrode head 25 at the end of the electrode rod 15 is squeezed to the position where spot welding is required, and the spot welding is completed after power is turned on. The welding of automobile parts is generally cyclical. After welding a car, there will be a period of idle time for transporting new automobile parts. During this period, the replacement wheel 4 is controlled to move between the upper clamping arm 12 and the lower clamping arm 13. During the movement, the upper clamping arm 12 and the lower clamping arm 13 are rotated outward and opened. After the replacement wheel 4 moves into place, the upper clamping arm 12 is controlled to rotate back to its position, and the upper clamping arm 12 drives the electrode rod 15 to insert the electrode head 25 into the disassembly sleeve 1 8, the electrode head 25 is disassembled by the disassembly sleeve 18, and then the upper clamping arm 12 is rotated upward, and the replacement wheel 4 is rotated at the same time, and another disassembly sleeve 18 with a new electrode head 25 already placed is rotated to the bottom of the upper clamping arm 12, and then the lower clamping arm 13 drives the electrode rod 15 to rotate, so that the electrode rod 15 and the electrode head 25 are docked, and then the two are installed by the disassembly sleeve 18; repeat the above operation to replace the electrode head 25 of the lower clamping arm 13. Through this arrangement, the fully automatic disassembly and replacement function of the electrode head 25 is realized, and the electrode head 25 can be replaced during a hollow period after long-term work; it can also be used to replace electrode heads 25 with different contact areas, thereby changing the spot welding area, improving the automation level of the welding equipment, and realizing a fully automatic high-quality welding process;

[0052] The rotating platform 3 is installed on the outside of the outer sleeve 2. As the rotating platform 3 drives the metal frame, the side motor 16 and the integral replacement wheel 4 to adjust their positions, the replacement wheel 4 is moved to the position for replacing the electrode head 25. When the replacement wheel 4 is not in use, the replacement wheel 4 is kept away from the upper clamping arm 12 and the lower clamping arm 13 so as not to affect normal welding work.

[0053] The center frame 7, the rear support arm 8 and the support frame 14 serve as the core support structure. The upper clamping arm 12 and the rotating arm 10 are stably rotated by the extension and contraction of the electric telescopic rod 9 in conjunction with the connecting shaft 11. During the welding process, generally only the upper clamping arm 12 is controlled to open and close, and the lower clamping arm 13 remains stationary, which reduces the difficulty of control. Only when the electrode head 25 of the lower clamping arm 13 is replaced, the reduction motor is used to drive the lower clamping arm 13 to rotate and move. The overall design of the resistance spot welding gun 1 is simple and firm, and can stably perform various operations, ensuring a long service life of the equipment.

[0054] The disassembly sleeve 18 is threadedly connected to the thread groove. The lifting and lowering of the disassembly sleeve 18 can be controlled by changing the rotation direction. When replacing the electrode head 25 of the upper clamping arm 12, as the electrode head 25 is inserted into the disassembly sleeve 18, the electrode head 25 is fixed by the grab valve 22. Then, the disassembly sleeve 18 and the electrode head 25 are driven by the electric wheel 21 to rotate together, thereby removing the electrode head 25 from the electrode rod 15 and leaving it in the replacement wheel 4, thereby taking away the old electrode head 25 and allowing the new electrode head 25 to move to the position of the electrode rod 15. The disassembly sleeve 18 is then controlled to move upward to install the new electrode head 25 on the electrode rod 15, completing the disassembly and assembly work.

[0055] A transmission belt can be used inside the transmission box 17 to transmit the power of the side motor 16 to the replacement wheel 4, thereby driving the replacement wheel 4 to rotate. Since the side motor 16 is fixed by the metal frame and is slidably engaged with the outer side of the replacement wheel 4, the stable rotation process of the replacement wheel 4 can be ensured.

[0056] When the replacement wheel 4 is rotating, the internal electric wheel 21 remains stationary. When the disassembly and assembly sleeve 18 needs to be driven to rotate, the electric wheel 21 is started to rotate, and the closest disassembly and assembly sleeve 18 is driven to rotate under the action of magnetic coupling. When the disassembly and assembly sleeve 18 completes its work, the replacement wheel 4 rotates to allow the other disassembly and assembly sleeve 18 to rotate to the position closest to the electric wheel 21, and the electrode head 25 is disassembled or installed. Through this arrangement, not only the function of contactless driving of the disassembly and assembly sleeve 18 to rotate is realized, thereby ensuring that the disassembly and assembly sleeve 18 can stably perform the process of up and down thread movement during the rotation process, but also one electric wheel 21 can control the rotation process of all disassembly and assembly sleeves 18, reducing the difficulty of operation;

[0057] The electric slide rail 20 can be used to control the electric wheel 21 to fit the disassembly sleeve 18 when transmission is required. When the replacement wheel 4 rotates, it stays away from the disassembly sleeve 18 to reduce the influence of magnetic attraction during rotation.

[0058] Two sets of grab valves 22 are located at the upper and lower ends, so that the upper and lower electrode heads 25 can be grabbed smoothly. The multiple grab valves 22 arranged in a ring can ensure the firmness of the grab;

[0059] By inserting the threaded bolt 24 and the docking hole, after the electrode head 25 and the electrode rod 15 are aligned and inserted, the electrode head 25 can be effectively driven to rotate and move with the rotation of the disassembly sleeve 18, so that it is effectively docked and tightened with the electrode rod 15, and finally the fixation of the grab valve 22 is released, so that the electrode head 25 is stably installed. At the same time, the electromagnetic transmission method, when tightening the electrode head 25, the rotation output force of the electric wheel 21 remains unchanged, and the spiral tightening force can still be slowly applied to the disassembly sleeve 18, ensuring the fixed installation of the electrode head 25. The disassembly process is the same, ensuring smooth tightening and disassembly.

[0060] The outer sleeve 2 is fixedly connected to the multi-axis robotic arm and other equipment through the connecting plate 6; the replacement slot of the disassembly and assembly box 5 is adapted to the thickness of the replacement wheel 4, and is used to receive the replaced electrode head 25 and place the new electrode head 25 into the disassembly and assembly sleeve 18 at the same time.

[0061] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic welding machine for automobile parts, characterized by: The invention comprises a resistance spot welding gun, wherein an outer sleeve is provided on the outside of the resistance spot welding gun, the resistance spot welding gun comprises an upper clamping arm and a lower clamping arm capable of opening and closing, an electrode rod is mounted on the end of each of the upper clamping arm and the lower clamping arm, a detachable electrode head is mounted on the end of the electrode rod, a replacement wheel capable of translation and rotation is provided on the outside of the outer sleeve, and a plurality of disassembly sleeves for disassembling and assembling the electrode heads are mounted in the replacement wheel; The resistance spot welding gun includes a center frame, a support frame is fixedly connected to the front end of the center frame, a reduction motor is fixedly connected to the middle part of the support frame, the rotating end of the reduction motor is fixedly connected to the end of the lower clamping arm, an electromagnetic buckle for clamping the lower clamping arm is installed inside the support frame, a rotating arm is rotatably connected to the upper part of the support frame, the upper clamping arm is fixedly connected to the rotating arm, the rear end of the center frame is fixedly connected to the rear support arm, the top of the rear support arm is fixedly connected to an electric telescopic rod, and a connecting shaft is installed between the electric telescopic rod and the top of the rotating arm; A rotating platform is fixedly connected to the outer side of the outer sleeve, a side motor for driving the replacement wheel to rotate is installed on the outer side of the replacement wheel, and a metal frame is fixedly connected to the rotating end of the rotating platform and the outer side of the side motor; A plurality of thread grooves extending to the bottom are provided on the top surface of the replacement wheel, and the plurality of thread grooves are arranged in a circular and equidistant manner. The threads of the disassembly sleeve are connected to the thread grooves. A grab valve for fixing the disassembly sleeve is installed inside the disassembly sleeve. An electric wheel for driving the disassembly sleeve to rotate is provided inside the replacement wheel.

2. The automatic welding machine for automobile parts according to claim 1, characterized in that: The side motor is slidably engaged with the outer side of the replacement wheel, and a transmission box for transmitting power is installed between the top output end of the side motor and the middle of the top surface of the replacement wheel.

3. The automatic welding machine for automobile parts according to claim 2, characterized in that: A hollow groove is provided at the bottom of the replacement wheel, and the electric wheel is located in the hollow groove. The electric wheel is arranged horizontally, and the outer surfaces of the electric wheel and the disassembly and assembly sleeve are fixed with multiple magnets arranged in a ring to form a magnetic coupling effect. A bending frame is fixed between the bottom of the electric wheel and the side motor.

4. The automatic welding machine for automobile parts according to claim 3, characterized in that: A horizontally arranged electric slide rail is fixedly connected to the top of the bending frame, and a movable end of the electric slide rail is connected to the electric wheel.

5. The automatic welding machine for automobile parts according to claim 4, characterized in that: The grab valves are divided into two groups, which are respectively located at the upper end and the bottom end of the inner wall of the disassembly sleeve, and the multiple grab valves in each group are arranged in a ring with equal distances.

6. The automatic welding machine for automobile parts according to claim 5, characterized in that: The bottom of each electrode rod is fixedly connected with a plug-in threaded bolt, and the end of each electrode head is provided with a docking hole adapted to the plug-in threaded bolt.

7. The automatic welding machine for automobile parts according to claim 6, characterized in that: The rear end of the external sleeve is fixedly connected with a connecting plate, the outside of the external sleeve is provided with a disassembly and assembly box, and the front end of the disassembly and assembly box is provided with a replacement groove adapted to the shape of the replacement wheel.

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