Servo robot welding tongs

Abstract

The present invention relates to the technical field of robot welding tongs, and specifically to a servo robot welding tongs, comprising a support plate, an upper electrode and a lower electrode, wherein a flange base is hinged on the support plate, a tongs arm is fixedly connected to the support plate, the upper electrode is fixedly mounted on the tongs arm, a cylinder is fixedly mounted on the support plate, the cylinder is slidably mounted on a piston rod, a lower electrode is mounted on the piston rod, and a transformer is fixedly connected to the support plate. The present invention arranges a buffer component on the servo robot welding tongs. When the cylinder drives the piston rod to move and the lower electrode contacts a workpiece, the buffer rod is subjected to the pressure of the workpiece and slides on the piston rod, thereby reducing the impact of the lower electrode on the workpiece. The design also arranges a clamping component on the servo robot welding tongs. After the buffering is completed, the buffer component clamps the buffer rod to prevent the vibration generated at the moment of welding from affecting the welding quality, thereby ensuring the welding quality of the servo robot welding tongs.

Description

Technical Field

[0001] The invention relates to the technical field of robot welding tongs, in particular to a servo robot welding tongs. Background Art

[0002] Servo robot welding tongs are a kind of efficient welding tools with servo control system, which are widely used in modern industrial production. It drives the movable welding arm through servo motor, and is controlled by welding controller and robot controller to achieve accurate and efficient welding operation.

[0003] The opening and closing of the servo robot welding clamp is usually controlled by a cylinder. The cylinder plays a vital role in the servo robot welding clamp. It realizes the opening and closing of the welding clamp by controlling the movement of the clamp arm. However, since the cylinder is powered by high-pressure gas, the pressurization speed is uncontrollable. The inertia generated by the clamp arm's own weight at high speed has a great impact on the workpiece. The impact will not only cause wear on the electrode and the workpiece, but also affect the quality of the weld.

[0004] In response to the above problems, the prior art provides some solutions. For example, patent application number: CN202123058110.8 provides a modular robot welding tongs, including a connecting flange, a U-shaped bracket, a transformer, an insulating seat, a fixed large pole arm, a fixed small pole arm, an electrode connecting plate one, a movable large pole arm, an electrode connecting plate two, a movable small pole arm, an anti-impact welding insulating mounting seat structure, a horizontally movable guide rod structure and an easy-to-replace electrode cap structure, the middle part of the right part of the connecting flange is bolted with a U-shaped bracket; the transformer is bolted to the left side of the U-shaped bracket, the insulating seat is bolted to the right side of the upper part of the U-shaped bracket, and the middle part of the upper part of the insulating seat is bolted to one end of the fixed large pole arm, wherein the other end of the fixed large pole arm is bolted to the fixed small pole arm. The buffer insulating mounting seat, mounting shaft, feed plate, block and anti-impact spring of the present invention are arranged to realize the anti-impact function. The scheme does not further reinforce the electrode after buffering, which will cause the vibration generated by welding to cause the electrode to displace and thus affect the welding quality. Summary of the invention

[0005] The purpose of the present invention is to provide a servo robot welding tongs to solve the problem that when the cylinder on the servo robot welding tongs drives the tongs arm to close, since the cylinder is powered by high-pressure gas, the pressurization speed is uncontrollable, and the inertia generated by the tongs arm's own weight at high speed has a large impact on the workpiece, which not only causes wear on the electrode and the workpiece, but also affects the quality of the weld.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A servo robot welding tongs comprises a support plate, an upper electrode and a lower electrode, wherein a flange base is hinged on the support plate, a tongs arm is fixedly connected to the support plate, the upper electrode is fixedly mounted on the tongs arm, a cylinder is fixedly mounted on the support plate, the cylinder is slidably mounted on a piston rod, a mounting seat is fixedly connected to the piston rod, the mounting seat is fixedly connected to the lower electrode, a transformer is fixedly connected to the support plate, the transformer is electrically connected to the upper electrode and the lower electrode respectively, the piston rod is provided with a buffer assembly having a buffer rod, the buffer rod is slidably connected to the piston rod, the buffer assembly is used to make the buffer rod slide along the piston rod when the lower electrode contacts the workpiece, a clamping assembly is also provided on the piston rod, the clamping assembly is used to limit the movement of the buffer rod after the buffer rod stops sliding.

[0008] It is easy to understand that the servo robot welding clamp is usually controlled to open and close by a cylinder. The cylinder plays a vital role in the servo robot welding clamp. It realizes the opening and closing of the welding clamp by controlling the movement of the clamp arm. However, since the cylinder is powered by high-pressure gas, the pressurization speed is uncontrollable. The inertia generated by the clamp arm's own weight at high speed has a large impact on the workpiece. The impact will not only cause wear to the electrode and the workpiece, but also affect the quality of the weld. The design is to set a buffer assembly with a buffer rod on the servo robot welding clamp. When the cylinder drives the piston rod to move, the lower electrode on the buffer rod quickly approaches the workpiece. When the lower electrode contacts the workpiece, the buffer rod will be subjected to the pressure of the workpiece and slide on the piston rod, thereby reducing the impact of the lower electrode on the workpiece. The design also provides a clamping assembly on the servo robot welding clamp. When the buffer assembly completes the buffering, it clamps the buffer rod to avoid the vibration generated at the moment of welding affecting the welding quality, thereby ensuring the welding quality of the servo robot welding clamp.

[0009] Preferably, the buffer assembly includes a buffer spring, a buffer chamber is provided on the piston rod, the buffer rod is slidably connected in the buffer chamber, and the surface of the buffer rod is in contact with the inner wall of the buffer chamber. A limiting rod is also provided inside the buffer chamber, and the limiting rod is fixedly connected to the piston rod. A limiting hole is also provided on the buffer rod, and the limiting rod is in contact with the inner wall of the limiting hole. The buffer spring is provided inside the buffer chamber, and one end of the buffer spring is fixedly connected to the bottom of the buffer rod and the other end is fixedly connected to the piston rod.

[0010] It is easy to understand that when the lower electrode quickly contacts the workpiece, the lower electrode will exert pressure on the workpiece and will be subjected to the reaction force of the workpiece. At this time, the lower electrode and the buffer rod will move inside the buffer chamber and squeeze the buffer spring inside the buffer chamber. At this time, the pressure of the lower electrode on the workpiece is reduced. Therefore, this design avoids the problem of impact on the workpiece due to the excessive speed of the lower electrode. A limit rod is also provided inside the buffer chamber. The limit rod fits with the inner wall of the limit hole on the buffer rod, thereby ensuring that the buffer rod does not swing in the horizontal direction during operation, thereby improving the welding quality of the servo robot welding clamp.

[0011] Preferably, the clamping assembly includes a slider, the piston rod is provided with four sliding holes, the four sliding holes are evenly distributed on the piston rod, the number of the sliders is 4, the four sliders are respectively slidably connected in the four sliding holes, the inner wall of the cylinder is provided with four rectangular grooves, the four rectangular grooves are respectively located on the outside of the sliding holes, an extrusion block 1 is provided on the outside of the sliding hole, the extrusion block 1 is fixedly connected to the inner wall of the cylinder, one end of the extrusion block 1 is provided with a rounded corner, and the extrusion block 1 fits with the surface of the piston rod.

[0012] It is easy to understand that the arc discharge of the upper and lower electrodes during the welding process will cause air vibration, and the thermal expansion and contraction during the welding process will also cause vibration of the material, and the generated vibration will act on the lower electrode. At this time, the lower electrode will be squeezed by the vibration and the buffer rod will move, thereby affecting the welding quality. After the buffer assembly completes the buffering, the cylinder continues to push the piston rod to move, and the inner wall of the piston rod squeezes the buffer spring and gradually moves toward the upper electrode, and the sliders around the piston rod move with the piston rod. When the end of the slider located on the outside of the piston rod contacts the extrusion block, the extrusion block will apply pressure to the slider to move the slider inside the sliding hole. When one end of the slider contacts the surface of the buffer rod, the slider will apply pressure to the buffer rod so that the buffer rod cannot move. At this time, the transformer energizes the upper and lower electrodes to weld the workpiece. At this time, the upper and lower electrodes and the workpiece can remain relatively stable, thereby reducing the impact of vibration on the lower electrode and the buffer rod, and further improving the welding quality of the servo robot welding clamp.

[0013] Preferably, the buffer rod is provided with vent hole 1 and vent hole 2, the vent hole 1 connects the inside of the buffer chamber with the outside of the buffer rod, and the outlet of the vent hole 1 is away from the inner wall of the piston rod, and the vent hole 2 connects the inside of the limit hole with the outside of the buffer rod.

[0014] It is easy to understand that when the buffer assembly buffers the buffer rod, the buffer rod will squeeze the buffer spring inside the buffer chamber. At this time, the air inside the buffer chamber will be squeezed out of the outside of the buffer chamber through the gap between the buffer rod and the piston rod. Since the gap between the buffer rod and the piston rod is small, the air flow speed is slow, which slows down the movement speed of the buffer rod. Therefore, when welding thicker workpieces, the movement distance of the buffer rod will increase. If the buffer rod cannot move quickly, it will still cause a certain degree of impact on the workpiece. The design is achieved by providing vent hole 1 and vent hole 2 on the buffer rod. When the buffer rod squeezes the buffer spring inside the buffer chamber and moves, the air inside the buffer chamber will flow to the outside of the buffer rod through vent hole 1 and vent hole 2. Therefore, the design ensures the flow speed of the air inside the buffer chamber, thereby ensuring the movement of the buffer rod, thereby improving the buffering effect of the buffer assembly.

[0015] Preferably, a locking tongue is provided inside the sliding hole, and the locking tongue is slidably connected to the piston rod. A locking hole is opened on the sliding block, and one end of the locking tongue extends into the locking hole. An extrusion spring is also provided on the piston rod, and one end of the extrusion spring is fixedly connected to the bottom of the locking tongue, and the other end is fixedly connected to the piston rod. An extrusion rod is fixedly connected to the locking tongue, and an extrusion block 2 is also slidably connected to the piston rod, and one end of the extrusion block 2 is in contact with the extrusion rod. An extrusion block 3 is also fixedly connected to the inner wall of the rectangular groove, and an inclined surface is provided on one side of the extrusion block 3, and the inclined surface is in contact with the extrusion rod.

[0016] It is easy to understand that when the upper and lower electrodes complete welding of the workpiece, the cylinder will drive the piston rod to move away from the upper electrode, and the buffer spring inside the buffer chamber will be gradually released during the movement of the piston rod, and the thrust of the buffer spring acts on the buffer rod, which makes the lower electrode still keep in contact with the workpiece during the movement of the piston rod, which will affect the cooling of the weld point and the upper and lower electrodes, thereby affecting the welding quality, and if the electrode does not leave the weld point in time, the electrode will stick to the weld point. At this time, moving the electrode away is likely to cause wear to the electrode, and the design connects the lock tongue by sliding on the piston rod. When the slider in the clamping assembly moves toward the buffer rod and applies pressure to the buffer rod, the locking hole on the slider comes to the position of the lock tongue, and the lock tongue is pushed into the locking hole by the extrusion spring. After the lower electrode completes welding, the cylinder drives the lower electrode to leave the workpiece, and the slider continues to apply pressure to the buffer rod, which makes the spring unable to push the buffer rod, thereby ensuring that the lower electrode can quickly leave the workpiece following the piston rod, further improving the welding quality of the servo robot welding tongs.

[0017] Preferably, return springs are provided on both sides of the four sliders, one end of the return spring is fixedly connected to the piston rod, and the other end is fixedly connected to the slider, and the slider is pushed away from the buffer rod by the spring.

[0018] It is easy to understand that the servo robot welding clamp may weld the workpiece from multiple angles, and when the servo robot welding clamp is tilted, the slider in the sliding hole will slide and contact the surface of the buffer rod. When the buffer assembly is working, if the slider contacts the surface of the buffer rod, this will increase the friction of the buffer rod, thereby reducing the buffering effect of the buffer assembly and causing wear on the surface of the slider and the buffer rod. This design sets a reset spring on both sides of the slider. When the clamping assembly completes its work, the spring will push the slider toward the outside of the piston rod and keep it away from the buffer rod. Therefore, this design not only ensures the buffering effect of the buffer assembly, but also avoids the friction between the slider and the surface of the buffer rod, thereby increasing the service life of the slider and the buffer rod.

[0019] Preferably, a pipe 1 is provided on the mounting seat, the lower electrode is threadedly connected to the mounting seat, a pipe 2 is provided on the lower electrode, the pipe 1 is connected to the pipe 2, and a joint is provided at the outlet of the pipe 1.

[0020] It is easy to understand that due to the action of the buffer component, the lower electrode will move back and forth, and a pipe is usually provided inside the electrode for circulating coolant. The coolant can quickly cool the electrode after welding is completed, and due to the action of the buffer component, the coolant; The circulating pipe is difficult to install. The design is to fix a mounting seat on the buffer rod, a pipe one is provided inside the mounting seat, and a joint is provided on the outside of the mounting seat for connecting the coolant pipe with pipe one, and the lower electrode is installed on the mounting seat through a threaded connection, and a pipe two is also opened on the lower electrode, and pipe two is connected with pipe one. Therefore, this design not only facilitates the installation of the lower electrode, but also the threaded connection method has good sealing, which can prevent the coolant inside the electrode from leaking in an intense working environment.

[0021] Preferably, an arc surface is provided at one end of the slider, the arc surface on the slider is in contact with the surface of the buffer rod, and the arc surfaces on the four sliders and the extrusion block are all coaxially arranged with the piston rod.

[0022] It is easy to understand that when the buffer assembly completes buffering, the cylinder will continue to push the piston rod so that the lower electrode applies a certain clamping force to the workpiece. At this time, due to the friction between the buffer rod and the inner wall of the piston rod, a certain degree of wear is caused. When the lower electrode applies pressure to the workpiece, it is easy to tilt, which can easily affect the welding quality. This design sets the front end of the slider to an arc surface that fits the surface of the buffer rod, and the axes of the arc surfaces on the four sliders are consistent with the axis of the cylinder piston rod. When the clamping assembly applies pressure to the buffer rod for clamping, the arc surface will fit with the buffer rod and apply pressure to the buffer rod. At this time, the tilted buffer rod is straightened after being subjected to the pressure of the arc surface. Therefore, this design ensures the welding quality of the servo robot welding clamp.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention arranges a buffer component on the servo robot welding tongs. When the lower electrode quickly contacts the workpiece, the lower electrode will be subjected to the reaction force of the workpiece. At this time, the lower electrode and the buffer rod will move inside the buffer chamber and squeeze the buffer spring inside the buffer chamber, thereby avoiding the problem of impact on the workpiece due to the excessive speed of the lower electrode. In addition, a limit rod is also arranged inside the buffer chamber. The limit rod fits with the inner wall of the limit hole on the buffer rod, thereby ensuring that the buffer rod will not swing in the horizontal direction during operation, thereby improving the welding quality of the servo robot welding tongs.

[0025] 2. The present invention arranges a clamping assembly on the servo robot welding tongs. After the buffer assembly completes buffering, the cylinder continues to push the piston rod to move. When the end of the slider located on the outside of the piston rod contacts the extrusion block, the extrusion block will apply pressure to the slider to move the slider inside the sliding hole. When one end of the slider contacts the surface of the buffer rod, the slider will apply pressure to the buffer rod to prevent the buffer rod from moving. At this time, the transformer energizes the upper and lower electrodes to weld the workpieces. At this time, the upper and lower electrodes and the workpiece can remain relatively stable, thereby reducing the influence of vibration on the lower electrode and the buffer rod, and further improving the welding quality of the servo robot welding tongs.

[0026] 3. The present invention arranges a locking tongue on the piston rod. When the slider in the clamping assembly moves toward the buffer rod and applies pressure to the buffer rod, the locking hole on the slider comes to the position of the locking tongue. The locking tongue is pushed into the locking hole by the extrusion spring. When the cylinder drives the lower electrode to leave the workpiece after the lower electrode completes welding, the slider continues to apply pressure to the buffer rod, which makes it impossible for the spring to push the buffer rod, thereby ensuring that the lower electrode can follow the piston rod to quickly leave the workpiece, further improving the welding quality of the servo robot welding tongs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the servo robot welding tongs of the present invention;

[0028] Figure 2 for Figure 1 Sectional view at AA;

[0029] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0030] Figure 4 for Figure 2 Enlarged view of point C in the middle;

[0031] Figure 5 for Figure 1 Sectional view at DD in the middle;

[0032] Figure 6 for Figure 5 Enlarged view of point E in the middle;

[0033] Figure 7 for Figure 5 Sectional view at FF;

[0034] Figure 8 for Figure 7 Enlarged view of point G in the middle.

[0035] In the figure: 1. support plate; 2. upper electrode; 3. lower electrode; 4. flange base; 5. clamp arm; 6. cylinder; 7. piston rod; 8. transformer; 9. buffer rod; 10. buffer spring; 11. buffer chamber; 12. limit rod; 13. limit hole; 14. slider; 15. sliding hole; 16. rectangular groove; 17. extrusion block one; 18. fillet; 19. vent one; 20. vent two; 21. lock tongue; 22. locking hole; 23. extrusion spring; 24. extrusion rod; 25. extrusion block two; 26. reset spring; 27. mounting seat; 28. pipe one; 29. ​​pipe two; 30. joint; 31. arc surface; 32. extrusion block three. DETAILED DESCRIPTION

[0036] The present invention provides a servo robot welding tongs, and the technical solution is as follows:

[0037] See also Figures 1 to 8 A servo robot welding tongs, comprising a support plate 1, an upper electrode 2 and a lower electrode 3, a flange base 4 is hinged on the support plate 1, a clamp arm 5 is also fixedly connected to the support plate 1, the upper electrode 2 is fixedly installed on the clamp arm 5, a cylinder 6 is also fixedly installed on the support plate 1, the cylinder 6 is slidably installed on the piston rod 7, the piston rod 7 is fixedly connected with a mounting seat 27, the mounting seat 27 is fixedly connected to the lower electrode 3, a transformer 8 is also fixedly connected to the support plate 1, the transformer 8 is electrically connected to the upper electrode 2 and the lower electrode 3 respectively, the piston rod 7 is provided with a buffer assembly with a buffer rod 9, the buffer rod 9 is slidably connected to the piston rod 7, the buffer assembly is used to make the buffer rod 9 slide along the piston rod 7 when the lower electrode 3 contacts the workpiece, and a clamping assembly is also provided on the piston rod 7, the clamping assembly is used to limit the movement of the buffer rod 9 after the buffer rod 9 stops sliding.

[0038] See also Figures 1 to 8The buffer assembly includes a buffer spring 10, a buffer chamber 11 is provided on the piston rod 7, a buffer rod 9 is slidably connected in the buffer chamber 11, and the surface of the buffer rod 9 is in contact with the inner wall of the buffer chamber 11, a limit rod 12 is also provided inside the buffer chamber 11, the limit rod 12 is fixedly connected to the piston rod 7, a limit hole 13 is also provided on the buffer rod 9, the limit rod 12 is in contact with the inner wall of the limit hole 13, the buffer spring 10 is provided inside the buffer chamber 11, one end of the buffer spring 10 is fixedly connected to the bottom of the buffer rod 9, and the other end is fixedly connected to the piston rod 7. The plug rod 7 is fixedly connected, and a vent hole 19 and a vent hole 20 are provided on the buffer rod 9. The vent hole 19 connects the interior of the buffer chamber 11 with the outside of the buffer rod 9, and the outlet of the vent hole 19 is far away from the inner wall of the piston rod 7. The vent hole 20 connects the interior of the limit hole 13 with the outside of the buffer rod 9. A pipe 1 28 is provided on the mounting seat 27, and the lower electrode 3 is threadedly connected to the mounting seat 27. A pipe 29 is provided on the lower electrode 3, and the pipe 1 28 is connected to the pipe 2 29. A joint 30 is provided at the outlet of the pipe 1 28.

[0039] See also Figures 1 to 8 The clamping assembly includes a slider 14, and four sliding holes 15 are provided on the piston rod 7. The four sliding holes 15 are evenly distributed on the piston rod 7. The number of sliders 14 is 4, and the four sliders 14 are respectively slidably connected in the four sliding holes 15. Four rectangular grooves 16 are provided on the inner wall of the cylinder 6. The four rectangular grooves 16 are respectively located on the outside of the sliding hole 15. An extrusion block 17 is provided on the outside of the sliding hole 15. The extrusion block 17 is fixedly connected to the inner wall of the cylinder 6. A rounded corner 18 is provided at one end of the extrusion block 17. The extrusion block 17 is in contact with the surface of the piston rod 7. A locking tongue 21 is provided inside the sliding hole 15. The locking tongue 21 is slidably connected to the piston rod 7. A locking hole 22 is provided on the slider 14. One end of the locking tongue 21 extends into the locking hole 22. An extrusion spring 23 is also provided on the piston rod 7. The extrusion spring 2 3 is fixedly connected to the bottom of the lock tongue 21 at one end, and is fixedly connected to the piston rod 7 at the other end. An extrusion rod 24 is fixedly connected to the lock tongue 21. An extrusion block 25 is also slidably connected to the piston rod 7. One end of the extrusion block 25 contacts the extrusion rod 24. An extrusion block 3 32 is also fixedly connected to the inner wall of the rectangular groove 16. An inclined surface is provided on one side of the extrusion block 32, and the inclined surface contacts the extrusion rod 24. Reset springs 26 are provided on both sides of the four sliders 14. One end of the reset spring 26 is fixedly connected to the piston rod 7, and the other end is fixedly connected to the slider 14. The slider 14 is pushed away from the buffer rod 9 by the spring. An arc surface 31 is provided at one end of the slider 14. The arc surface 31 on the slider 14 fits the surface of the buffer rod 9. The arc surfaces 31 on the four sliders 14 and the extrusion block 17 are coaxially arranged with the piston rod 7.

[0040] See also Figures 1 to 8, when the cylinder 6 pushes the piston rod 7 to make the lower electrode 3 move quickly toward the workpiece, the cylinder 6 starts and pushes the piston rod 7, the piston rod 7 moves toward the upper electrode 2, the buffer rod 9 on the piston rod 7 and the lower electrode 3 on the buffer rod 9 move together with the piston rod 7, when the lower electrode 3 contacts the workpiece to be welded, the lower electrode 3 will apply pressure to the workpiece and at the same time be subjected to the reaction force from the work, the lower electrode 3 will squeeze the buffer rod 9 after being subjected to the reaction force, the buffer rod 9 will then squeeze the buffer spring 10 inside the buffer chamber 11 and slide inside the buffer chamber 11, at this time, the cylinder 6 continues to push the piston rod 7 to move toward the upper electrode 2, at this time, the buffer rod 9 and the upper and lower electrodes 3 of the buffer rod 9 are relatively stationary, the inner wall of the piston rod 7 squeezes the buffer spring 10 and gradually moves toward the upper electrode 2, and the activity The sliders 14 around the plug rod 7 move with the piston rod 7. When the end of the slider 14 located on the outside of the piston rod 7 contacts the extrusion block, the extrusion block will apply pressure to the slider 14 so that the slider 14 squeezes the reset spring 26 and moves inside the sliding hole 15. The arc surface 31 at one end of the slider 14 contacts the surface of the buffer rod 9. At this time, the slider 14 will apply pressure to the buffer rod 9. At this time, the buffer rod 9 cannot continue to slide inside the buffer chamber 11. At this time, the locking hole 22 on the slider 14 comes to the position of the locking tongue 21, and the locking tongue 21 is pushed into the locking hole 22 by the extrusion spring 23. At this time, the reinforcement of the buffer rod 9 is completed, and the cylinder 6 continues to push the piston rod 7 to clamp the lower electrode 3 and the upper electrode 2 to the workpiece. At this time, the transformer 8 is energized to enable the upper and lower electrodes 3 to weld the workpiece.

[0041] See also Figures 1 to 8 , when the upper and lower electrodes 3 complete welding of the workpiece, the cylinder 6 is started, causing the piston rod 7 to move in the direction away from the upper electrode 2. At this time, the buffer rod 9 and the lower electrode 3 on the buffer rod 9 follow the piston rod 7 to quickly leave the workpiece surface, and one end of the slider 14 is away from the extrusion block 17. When the piston rod 7 moves a certain distance, the extrusion block 25 on the piston rod 7 will contact the extrusion block 3 32 on the rectangular groove 16. At this time, the extrusion block 3 32 will apply pressure to the extrusion block 25 and push the extrusion block 25. At this time, the extrusion block 25 contacts the extrusion rod 24 on the lock tongue 21 and applies pressure to the extrusion rod 24. After the extrusion rod 24 is subjected to pressure, it drives the lock tongue 21 to squeeze the extrusion spring 23 and move in the direction away from the locking hole 22. When the lock tongue 21 completely leaves the locking hole 22, the return springs 26 on both sides of the slider 14 push the slider 14 away from the buffer rod 9. At this time, the buffer rod 9 loses the pressure of the surrounding sliders 14 and is pushed by the buffer spring 10 inside the buffer chamber 11. At this time, the cylinder 6 is closed.

[0042] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A servo robot welding tongs, comprising a support plate (1), an upper electrode (2) and a lower electrode (3), wherein the support plate (1) is hinged with a flange base (4), the support plate (1) is also fixedly connected with a tong arm (5), the upper electrode (2) is fixedly mounted on the tong arm (5), the support plate (1) is also fixedly mounted with a cylinder (6), the cylinder (6) is slidably mounted on a piston rod (7), the piston rod (7) is fixedly connected to the lower electrode (3), the support plate (1) is also fixedly connected with a transformer (8), the transformer (8) is electrically connected to the upper electrode (2) and the lower electrode (3), respectively, characterized in that: The piston rod (7) is provided with a buffer assembly having a buffer rod (9), the buffer rod (9) being slidably connected to the piston rod (7), the buffer assembly being used to make the buffer rod (9) slide along the piston rod (7) when the lower electrode (3) contacts the workpiece, the piston rod (7) is also provided with a clamping assembly, the clamping assembly being used to limit the movement of the buffer rod (9) after the buffer rod (9) stops sliding, the piston rod (7) is fixedly connected with a mounting seat (27), the mounting seat (27) being fixedly connected to the lower electrode (3).

2. A servo robot welding tongs according to claim 1, characterized in that: The buffer assembly comprises a buffer spring (10), a buffer chamber (11) is provided on the piston rod (7), the buffer rod (9) is slidably connected in the buffer chamber (11), and the surface of the buffer rod (9) is in contact with the inner wall of the buffer chamber (11), a limiting rod (12) is also provided inside the buffer chamber (11), the limiting rod (12) is fixedly connected to the piston rod (7), a limiting hole (13) is also provided on the buffer rod (9), the limiting rod (12) is in contact with the inner wall of the limiting hole (13), the buffer spring (10) is provided inside the buffer chamber (11), one end of the buffer spring (10) is fixedly connected to the bottom of the buffer rod (9), and the other end is fixedly connected to the piston rod (7).

3. A servo robot welding tongs according to claim 2, characterized in that: The clamping assembly comprises a slider (14), the piston rod (7) is provided with four sliding holes (15), the four sliding holes (15) are evenly distributed on the piston rod (7), the number of the sliders (14) is 4, the four sliders (14) are respectively slidably connected in the four sliding holes (15), the inner wall of the cylinder (6) is provided with four rectangular grooves (16), the four rectangular grooves (16) are respectively located on the outside of the sliding holes (15), an extrusion block (17) is arranged on the outside of the sliding hole (15), the extrusion block (17) is fixedly connected to the inner wall of the cylinder (6), one end of the extrusion block (17) is provided with a rounded corner (18), and the extrusion block (17) is in contact with the surface of the piston rod (7).

4. A servo robot welding tongs according to claim 2, characterized in that: The buffer rod (9) is provided with a vent hole 1 (19) and a vent hole 2 (20). The vent hole 1 (19) connects the interior of the buffer chamber (11) with the exterior of the buffer rod (9), and the outlet of the vent hole 1 (19) is away from the inner wall of the piston rod (7). The vent hole 2 (20) connects the interior of the limit hole (13) with the exterior of the buffer rod (9).

5. The servo robot welding tongs according to claim 3, characterized in that: A locking tongue (21) is arranged inside the sliding hole (15), and the locking tongue (21) is slidably connected to the piston rod (7). A locking hole (22) is provided on the sliding block (14), and one end of the locking tongue (21) extends into the locking hole (22). An extrusion spring (23) is also arranged on the piston rod (7), and one end of the extrusion spring (23) is fixedly connected to the bottom of the locking tongue (21), and the other end is fixedly connected to the piston rod (7). An extrusion rod (24) is fixedly connected to the locking tongue (21), and an extrusion block 2 (25) is also slidably connected to the piston rod (7), and one end of the extrusion block 2 (25) contacts the extrusion rod (24). An extrusion block 3 (32) is also fixedly connected to the inner wall of the rectangular groove (16), and an inclined surface is arranged on one side of the extrusion block 3 (32), and the inclined surface contacts the extrusion rod (24).

6. A servo robot welding tongs according to claim 4, characterized in that: A return spring (26) is provided on both sides of the four sliders (14); one end of the return spring (26) is fixedly connected to the piston rod (7), and the other end is fixedly connected to the slider (14); the slider (14) is pushed away from the buffer rod (9) by the return spring (26).

7. The servo robot welding tongs according to claim 2, characterized in that: The mounting seat (27) is provided with a pipe 1 (28), the lower electrode (3) is threadedly connected to the mounting seat (27), the lower electrode (3) is provided with a pipe 2 (29), the pipe 1 (28) is connected to the pipe 2 (29), and a joint (30) is provided at the outlet of the pipe 1 (28).

8. The servo robot welding tongs according to claim 6, characterized in that: A circular arc surface (31) is provided at one end of the slider (14), the circular arc surface (31) on the slider (14) is in contact with the surface of the buffer rod (9), the axes of the circular arc surfaces (31) on the four sliders (14) are consistent, and the circular arc surfaces (31) on the four sliders (14) and the extrusion block (17) are all coaxially arranged with the piston rod (7).

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