Resistance spot welding tool

Abstract

The invention discloses a resistance spot welding tool, which relates to the technical field of resistance spot welding and comprises a resistance spot welding machine body, wherein a rectangular frame is arranged in the middle of the front end surface of the resistance spot welding machine body, a bidirectional screw rod is rotatably arranged in the rectangular frame, the top of the bidirectional screw rod movably penetrates the top surface of the rectangular frame and is provided with a driving motor, the bottom of the bidirectional screw rod movably penetrates the bottom of the rectangular frame and is provided with a cleaning mechanism, a welding platform is arranged in the middle of the front end surface of the rectangular frame, sliders are sleeved on the outer walls of both ends of the bidirectional screw rod, a connecting mechanism is arranged in the rectangular cavity, and a welding mechanism is arranged on the front end surface of the slider; the invention facilitates blowing the generated gas onto the plate through the use of the cleaning mechanism, and the early gas facilitates cleaning the dust on the surface of the plate to be welded, so as to avoid the dust of the plate causing the welding spot to be perforated, thereby improving the quality of welding, and the later gas can assist the welding spot to cool quickly after welding, so as to avoid the welding head becoming thick as a mushroom head due to the poor cooling effect of the welding spot, thereby facilitating the protection of the welding head.

Description

Technical Field

[0001] The invention relates to the technical field of resistance spot welding, in particular to a resistance spot welding tool. Background Art

[0002] Spot welding is to assemble the weldment into a lap joint and press it between two electrodes. The resistance heat generated when the current passes through the weldment is used to melt the parent metal and form a weld after cooling. The double-sided double-point overcurrent welding principle is adopted. When the two electrodes are pressed into the workpiece, the two metal layers form a certain contact resistance under the pressure of the two electrodes. When the welding current flows from one electrode to the other, the two contact resistance points form an instantaneous thermal fusion, and the welding current flows from the other electrode to the two workpieces, forming a circuit instantly without causing damage to the two electrodes. During welding, since dust will adhere to the surface of the plate to be welded, and the existing resistance welding machine cannot clean the dust on the plate, it will cause the phenomenon of weld perforation, thereby affecting the quality of welding. At the same time, when the existing resistance welding machine is in use, it is easy to cause one welding head to be powered on, while the other welding head has not been powered on, resulting in the generation of an arc, and the arc will break through the air, which will cause the phenomenon of weld perforation, seriously affecting the quality of plate welding. Therefore, a resistance welding tool is designed to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a resistance spot welding tool.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A resistance spot welding tool, comprising a resistance spot welding machine body, a rectangular frame is provided in the middle of the front end surface of the resistance spot welding machine body, a bidirectional screw rod is rotatably provided in the rectangular frame, the top of the bidirectional screw rod is movable and penetrates the top surface of the rectangular frame and is provided with a driving motor, the bottom of the bidirectional screw rod is movable and penetrates the bottom of the rectangular frame and is provided with a cleaning mechanism for cleaning dust, a welding platform is provided in the middle of the front end surface of the rectangular frame, a welding opening is provided in the middle of the top surface of the welding platform, sliders are sleeved on the outer walls of both ends of the bidirectional screw rod, a rectangular cavity is provided in the slider, a connecting mechanism is provided in the rectangular cavity, and a welding mechanism is provided on the front end surface of the slider;

[0006] The welding mechanism comprises a connecting plate arranged on the front end surface of the slider and a hollow rod arranged on the front end surface of the connecting plate, an annular cylinder is arranged at one end of the hollow rod close to the welding table, a sleeve is arranged at one end of the annular cylinder close to the welding table, a welding head is slidably arranged at one end of the sleeve close to the welding table, and a disconnection component for disconnecting the connecting mechanism is arranged in both sleeves;

[0007] The connecting mechanism comprises a semicircular threaded sleeve symmetrically slidably arranged in a rectangular cavity and matched with a bidirectional screw rod, an extrusion spring is arranged between the semicircular threaded sleeve and the rectangular cavity, rectangular grooves are symmetrically opened on the side surface of the rectangular cavity, strip cavities are symmetrically opened on the inner wall of the rectangular groove, a sealing plate is slidably arranged in the strip cavity, and the sealing plate is fixedly connected to the semicircular threaded sleeve, a sliding plate is arranged on the outer side surface of the sealing plate, and the sliding plate is slidably arranged with the rectangular groove;

[0008] The disconnection assembly includes a circular push plate slidably arranged in the annular cylinder, and the circular push plate is fixedly connected to the top of the welding head, a liquid guide groove A connected to the hollow rod is provided inside the connecting plate, a liquid guide groove B connected to the rectangular groove in the connecting mechanism is provided inside the sliding block, and one end of the liquid guide groove B is located between the two sliding plates, and the liquid guide groove B is connected to the liquid guide groove A, and the annular cylinder, the hollow rod, the liquid guide groove B and the liquid guide groove A are all filled with hydraulic oil;

[0009] A contact groove is provided on one side of the circular push plate close to the welding head, a trigger sensor matching the contact groove is provided on the inner wall of the annular cylinder, and a control device matching the trigger sensor is provided at the bottom of the front end surface of the resistance spot welding machine body.

[0010] Preferably, a mounting groove is provided at one end of one of the strip-shaped cavities, a limiting groove is provided in the middle of the mounting groove, a fixing rod is movably provided in the mounting groove, and one end of the fixing rod extends into the strip cavity, a limiting plate is provided on the outer wall of the fixing rod, and the limiting plate and the limiting groove are slidably arranged, a return spring is sleeved on the outer wall of the fixing rod between the limiting plate and the limiting groove, a fixing groove is provided on the inner wall of the rectangular frame to cooperate with the fixing rod, and one of the sealing plates and the bottom surface of the fixing rod are both inclined surfaces.

[0011] Preferably, the sealing plate and the strip cavity are arranged as a dynamic sealing structure, wherein a sliding groove is opened in one of the sealing plates, and a baffle is arranged on the side of the other sealing plate to cooperate with the sliding groove, and the baffle and the sliding groove are arranged as a dynamic sealing structure.

[0012] Preferably, a liquid storage cavity is provided in the sliding block, and the liquid storage cavity is communicated with the liquid guiding groove B. A movable plate is slidably provided in the liquid storage cavity, and a micro electric telescopic rod is provided on one side surface of the movable plate.

[0013] Preferably, the cleaning mechanism comprises a protective shell arranged on the bottom surface of the resistance spot welding machine body, the bottom of the two-way screw rod movably penetrates into the protective shell and is provided with a disc, a short column is provided at the edge of the bottom surface of the disc, an annular plate is movably provided on the outer wall of the short column, a sealing box is provided on the bottom surface of the resistance spot welding machine body, a piston is movably provided in the sealing box, a connecting rod is provided on one side surface of the annular plate, and one end of the connecting rod movably penetrates into the sealing box and is fixedly connected to the piston, an air inlet pipe is provided at the edges of both ends of one side surface of the sealing box, a one-way air inlet valve is provided on the outer wall of the air inlet pipe, a connecting pipe is provided on one side surface of the resistance spot welding machine body, an air outlet pipe connected with the connecting pipe is provided at the edges of both ends of the other side surface of the sealing box, a one-way air outlet valve is provided on the outer wall of the air outlet pipe, and two air guide pipes are provided on one end surface of the connecting pipe, one end of the air guide pipe is inclined above the welding port, and the other end of the air guide pipe is located inside the welding port.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention facilitates blowing the generated gas onto the plate by using a cleaning mechanism, and the early gas is convenient for cleaning the dust on the surface of the plate to be welded, so as to avoid the dust on the plate causing the welding point to be perforated, thereby improving the quality of welding, and the later gas can assist the welding point to be cooled quickly after welding, so as to avoid the welding head becoming thick like a mushroom head due to poor cooling effect of the welding point, thereby facilitating the protection of the welding head;

[0016] The present invention facilitates the control of the on and off of the welding head by using a trigger sensor and a control device in coordination, so that the two welding heads can be energized at the same time, so as to avoid the formation of an arc due to the different time of current passing through the plate caused by one welding head being energized first and the other being energized later, thereby avoiding the phenomenon that the arc breaks through the air and causes the welding point to be perforated, and further improving the quality of plate welding; wherein, the welding head is conveniently buffered by the cooperation of the sliding arrangement of the welding head and the hydraulic oil, so as to avoid the welding head being damaged due to the collision between the welding head and the plate, and further facilitating the protection of the plate;

[0017] The present invention ensures that the bidirectional screw always rotates through the use of a connecting mechanism, and the welding head stops moving when it moves to a certain position, so that the welding head and the cleaning mechanism always work without interfering with each other, thereby improving the working efficiency of plate welding; the movable plate is pulled to move by a micro-electric telescopic rod, so that the hydraulic oil in the liquid guide groove B is easily pumped into the liquid storage chamber, so that the pressure in the liquid guide groove B becomes smaller, and then the two semicircular threaded sleeves are brought into contact with the bidirectional screw under the action of the extrusion spring, thereby facilitating the resetting of the welding head. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It is a front view structural schematic diagram of the present invention;

[0020] Figure 2 It is a bottom view structural schematic diagram of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the welding mechanism of the present invention;

[0022] Figure 4 It is a schematic diagram of a top-view cross-sectional structure of a slider of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the connection mechanism of the present invention;

[0024] Figure 6 It is a schematic diagram of a top cross-sectional structure of a sealing plate of the present invention;

[0025] Figure 7 It is a schematic diagram of the cross-sectional structure of the annular cylinder of the present invention;

[0026] Figure 8 It is a structural schematic diagram of the cleaning mechanism of the present invention.

[0027] Serial numbers in the figure: 1. Resistance spot welding machine body; 2. Driving motor; 3. Air guide tube; 4. Connecting tube; 5. Welding port; 6. Rectangular frame; 7. Connecting plate; 8. Sleeve; 9. Bidirectional screw rod; 10. Welding table; 11. Welding head; 12. Annular cylinder; 13. Protective shell; 14. Sealing box; 15. Air outlet pipe; 16. Sliding block; 17. Hollow rod; 18. Liquid guide groove A; 19. Strip cavity; 20. Sealing plate; 21. Semicircular threaded sleeve; 22. Extrusion spring ; 23. Rectangular cavity; 24. Rectangular groove; 25. Sliding plate; 26. Liquid guide groove B; 27. Baffle; 28. Circular push plate; 29. ​​Trigger sensor; 30. One-way air outlet valve; 31. Disc; 32. Short column; 33. Ring plate; 34. Connecting rod; 35. One-way air inlet valve; 36. Piston; 37. Inlet pipe; 38. Fixed rod; 39. Limiting plate; 40. Reset spring; 41. Micro electric telescopic rod; 42. Liquid storage chamber; 43. Movable plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Example: See Figure 1-8 A resistance spot welding tool comprises a resistance spot welding machine body 1, a rectangular frame 6 is arranged in the middle of the front end surface of the resistance spot welding machine body 1, a bidirectional screw rod 9 is rotatably arranged in the rectangular frame 6, the top of the bidirectional screw rod 9 is movable and penetrates to the top surface of the rectangular frame 6 and is provided with a driving motor 2, and the bottom of the bidirectional screw rod 9 is movable and penetrates to the bottom of the rectangular frame 6 and is provided with a cleaning mechanism for cleaning dust. By using the cleaning mechanism, it is convenient to clean the dust on the surface of the plate to be welded, so as to avoid the dust of the plate causing the perforation of the weld spot, thereby improving the quality of welding; at the same time, it can also assist the rapid cooling of the weld spot after welding, so as to avoid the poor cooling effect of the weld spot This causes the welding head 11 to be as thick as a mushroom head, thereby facilitating the protection of the welding head 11; a welding platform 10 is provided in the middle of the front end face of the rectangular frame 6, a welding port 5 is provided in the middle of the top face of the welding platform 10, sliders 16 are sleeved on the outer walls of both ends of the bidirectional screw rod 9, a rectangular cavity 23 is provided in the slider 16, and a connecting mechanism is provided in the rectangular cavity 23. Through the use of the connecting mechanism, it is ensured that the bidirectional screw rod 9 always rotates but the welding head 11 stops moving when it moves to a certain position, so that the welding head 11 and the cleaning mechanism always work without interfering with each other, thereby improving the working efficiency of plate electric welding; a welding mechanism is provided on the front end face of the slider 16.

[0030] The welding mechanism includes a connecting plate 7 arranged on the front end surface of the slider 16 and a hollow rod 17 arranged on the front end surface of the connecting plate 7. An annular cylinder 12 is provided at one end of the hollow rod 17 close to the welding table 10, and a sleeve 8 is provided at one end of the annular cylinder 12 close to the welding table 10. A welding head 11 is slidably provided at one end of the sleeve 8 close to the welding table 10. A disconnection component for disconnecting the connecting mechanism is provided in the two sleeves 8. By using the disconnection component, the semicircular threaded sleeve 21 is easily separated from the bidirectional screw rod 9, thereby stopping the movement of the welding head 11.

[0031] The connecting mechanism includes a semicircular threaded sleeve 21 symmetrically slidably arranged in a rectangular cavity 23 and cooperating with the bidirectional screw rod 9, an extrusion spring 22 is arranged between the semicircular threaded sleeve 21 and the rectangular cavity 23, rectangular grooves 24 are symmetrically opened on the side of the rectangular cavity 23, and strip cavities 19 are symmetrically opened on the inner wall of the rectangular groove 24. A sealing plate 20 is slidably arranged in the strip cavity 19, and the sealing plate 20 is fixedly connected to the semicircular threaded sleeve 21, a sliding plate 25 is arranged on the outer surface of the sealing plate 20, and the sliding plate 25 is slidably arranged with the rectangular groove 24.

[0032] The disconnection assembly includes a circular push plate 28 slidably arranged in the annular cylinder 12, and the circular push plate 28 is fixedly connected to the top of the welding head 11, a liquid guide groove A18 connected to the hollow rod 17 is provided inside the connecting plate 7, a liquid guide groove B26 connected to the rectangular groove 24 in the connecting mechanism is provided in the sliding block 16, and one end of the liquid guide groove B26 is located between the two sliding plates 25, and the liquid guide groove B26 is connected to the liquid guide groove A18. The annular cylinder 12, the hollow rod 17, the liquid guide groove B26 and the liquid guide groove A18 are all filled with hydraulic oil. Through the cooperation of the sliding arrangement on the welding head 11 and the hydraulic oil, a buffering effect is played on the welding head 11 to avoid the welding head 11 colliding with the plate and causing damage to the welding head 11, and further facilitate the protection of the welding head 11.

[0033] A contact groove is provided on one side surface of the circular push plate 28 close to the welding head 11, and a trigger sensor 29 matching the contact groove is provided on the inner wall of the annular cylinder 12. A control device matching the trigger sensor 29 is provided at the bottom of the front end surface of the resistance spot welding machine body 1, wherein the control device includes a processor and a controller, and the processor and the trigger sensor 29 are connected by a wire. Through the coordinated use of the trigger sensor 29 and the control device, it is convenient to control the power on and off of the welding head 11, so that it is convenient to power on the two welding heads 11 at the same time, so as to avoid that one welding head 11 is powered on first and the other is powered on later, resulting in different time for the current to pass through the plate and form an arc, thereby avoiding the arc breaking through the air and causing perforation of the weld, thereby further improving the quality of plate welding.

[0034] In the present invention, a mounting groove is provided at one end of one of the strip cavities 19, a limiting groove is provided in the middle of the mounting groove, a fixing rod 38 is movably provided in the mounting groove, and one end of the fixing rod 38 extends into the strip cavity 19, a limiting plate 39 is provided on the outer wall of the fixing rod 38, and the limiting plate 39 is slidably arranged with the limiting groove, a reset spring 40 is sleeved on the outer wall of the fixing rod 38 between the limiting plate 39 and the limiting groove, a fixing groove is provided on the inner wall of the rectangular frame 6 to cooperate with the fixing rod 38, and the bottom surfaces of one of the sealing plates 20 and the fixing rod 38 are both inclined surfaces; the fixing rod 38 is pushed into the fixing groove by the sealing plate 20 to fix the slider 16, thereby fixing the welding head 11, and preventing the slider 16 from falling off after the semicircular threaded sleeve 21 is separated from the bidirectional screw rod 9, thereby affecting the welding of the plate.

[0035] In the present invention, the sealing plate 20 and the strip cavity 19 are arranged as a dynamic sealing structure, wherein a sliding groove is opened in one of the sealing plates 20, and a baffle 27 is arranged on the side of the other sealing plate 20 to cooperate with the sliding groove, and the baffle 27 and the sliding groove are arranged as a dynamic sealing structure. By using the baffle 27, it is convenient to seal the gap between the sealing plates 20 to avoid leakage of hydraulic oil, thereby ensuring the use of the connecting mechanism.

[0036] In the present invention, a liquid storage chamber 42 is opened in the slider 16, and the liquid storage chamber 42 is connected to the liquid guide groove B26. A movable plate 43 is slidably provided in the liquid storage chamber 42, and a micro-electric telescopic rod 41 is provided on one side of the movable plate 43. The movable plate 43 is pulled to move by the micro-electric telescopic rod 41, so that the hydraulic oil in the liquid guide groove B26 is conveniently drawn into the liquid storage chamber 42, so that the pressure in the liquid guide groove B26 becomes smaller, and then under the action of the extrusion spring 22, the two semicircular threaded sleeves 21 are brought into contact with the bidirectional screw rod 9, thereby facilitating the resetting of the welding head 11.

[0037] In the present invention, the cleaning mechanism includes a protective shell 13 arranged on the bottom surface of the resistance spot welding machine body 1, the bottom of the bidirectional screw 9 movably penetrates into the protective shell 13 and is provided with a disc 31, a short column 32 is provided at the edge of the bottom surface of the disc 31, and an annular plate 33 is movably provided on the outer wall of the short column 32, a sealing box 14 is provided on the bottom surface of the resistance spot welding machine body 1, a piston 36 is movably provided in the sealing box 14, a connecting rod 34 is provided on one side surface of the annular plate 33, and one end of the connecting rod 34 movably penetrates into the sealing box 14 and is fixedly connected to the piston 36, an air inlet pipe 37 is provided at the edges of both ends of one side of the sealing box 14, and the air inlet pipe 37 is provided at the edges of both ends of the side surface of the sealing box 14. A one-way air inlet valve 35 is provided on the outer wall of the resistance spot welding machine body 1, a connecting pipe 4 is provided on one side surface of the resistance spot welding machine body 1, and an air outlet pipe 15 connected with the connecting pipe 4 is provided at both ends of the edge of the other side surface of the sealing box 14, and a one-way air outlet valve 30 is provided on the outer wall of the air outlet pipe 15, and two air guide pipes 3 are provided on one end surface of the connecting pipe 4, wherein an end of one air guide pipe 3 is tilted above the welding port 5, and an end of the other air guide pipe 3 is located inside the welding port 5; wherein, the piston 36 reciprocates in the sealing box 14, and gas is always generated, so that it is convenient to blow air to the plate all the time, so as to clean and cool the surface of the plate.

[0038] Working principle: When the present invention is used, it includes the following steps:

[0039] Step 1: First, place two plates on the welding table 10, then start the driving motor 2, and drive the bidirectional screw 9 to rotate through the output shaft of the driving motor 2. Under the cooperation of the two semicircular threaded sleeves 21, the two sliders 16 will move relative to each other, and then drive the connecting plate 7 to move relative to each other, thereby driving the hollow rod 17, the annular cylinder 12, the sleeve 8 and the welding head 11 to move relative to each other, and finally make the two welding heads 11 contact with the top surface and the bottom surface of the plate respectively;

[0040] Step 2: After the welding head 11 contacts the plate, the slider 16 continues to move, which will cause the welding head 11 to move into the sleeve 8, thereby driving the circular push plate 28 to move, thereby pushing out the hydraulic oil in the annular cylinder 12, and then the hydraulic oil enters the liquid guide groove A18 through the hollow rod 17, and then the hydraulic oil enters the liquid guide groove B26, and finally the hydraulic oil enters between the two sliding plates 25. As the hydraulic oil between the sliding plates 25 increases, the sliding plates 25 will move, thereby driving the sealing plate 20 to move, thereby moving the semicircular threaded sleeve 21, separating the semicircular threaded sleeve 21 from the bidirectional screw rod 9, and stopping the movement of the welding head 11; wherein, when the sealing plate 20 moves, it will push the fixing rod 38 to move, and when the semicircular threaded sleeve 21 separates from the bidirectional screw rod 9, the fixing rod 38 is inserted into the fixing groove to fix the slider 16, thereby preventing the welding head 11 from separating from the plate;

[0041] Step 3: When the semicircular threaded sleeve 21 is separated from the bidirectional screw rod 9, the circular push plate 28 is separated from the trigger sensor 29, and then the trigger sensor 29 receives the signal and transmits the signal to the processor in the control device. The processor processes and controls the two welding heads 11 to be powered on at the same time, so as to avoid the formation of an arc due to the different time of current passing through the plate due to one welding head 11 being powered on first and the other being powered on later, thereby avoiding the phenomenon that the arc will break through the air and cause the welding point to be perforated, and further improving the quality of plate welding;

[0042] Step 4: When the bidirectional screw 9 rotates, the disc 31 will rotate, and then the short column 32 will rotate, so that the annular plate 33 will reciprocate, and then the connecting rod 34 will reciprocate. The reciprocating movement of the connecting rod 34 will drive the piston 36 to reciprocate in the piston 36, so that the gas in the sealing box 14 is transported to the connecting pipe 4 through the outlet pipe 15, and then blown to the welding points on the top and bottom surfaces of the plate through the air guide pipe 3. The early gas is convenient for removing dust on the plate to prevent dust from causing perforation of the welding point, thereby improving the quality of welding; and the later gas is to assist the rapid cooling of the welding point after welding, so as to prevent the welding head 11 from becoming thick as a mushroom head due to poor cooling effect of the welding point, thereby facilitating the protection of the welding head 11;

[0043] Step 5: When welding is completed, open the micro electric telescopic rod 41, and the movable plate 43 is driven to move by the action of the micro electric telescopic rod 41, thereby pumping the hydraulic oil in the liquid guide groove B26 into the liquid storage chamber 42, reducing the pressure in the liquid guide groove B26, and then the semicircular threaded sleeve 21 contacts the bidirectional screw rod 9 under the action of the extrusion spring 22, and at the same time, the fixed rod 38 is disengaged from the fixed groove under the action of the reset spring 40, and then the output shaft of the drive motor 2 is controlled to reverse, thereby separating the welding head 11 from the plate, facilitating the unloading of the plate.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A resistance spot welding tool, comprising a resistance spot welding machine body (1), characterized in that: A rectangular frame (6) is provided in the middle of the front end surface of the resistance spot welding machine body (1), a bidirectional screw rod (9) is rotatably provided in the rectangular frame (6), the top of the bidirectional screw rod (9) is movable and penetrates through the top surface of the rectangular frame (6) and is provided with a driving motor (2), the bottom of the bidirectional screw rod (9) is movable and penetrates through the bottom of the rectangular frame (6) and is provided with a cleaning mechanism for cleaning dust, a welding platform (10) is provided in the middle of the front end surface of the rectangular frame (6), a welding opening (5) is provided in the middle of the top surface of the welding platform (10), sliders (16) are sleeved on the outer walls of both ends of the bidirectional screw rod (9), a rectangular cavity (23) is provided in the slider (16), a connecting mechanism is provided in the rectangular cavity (23), and a welding mechanism is provided on the front end surface of the slider (16); The welding mechanism comprises a connecting plate (7) arranged on the front end surface of a slider (16) and a hollow rod (17) arranged on the front end surface of the connecting plate (7); an annular cylinder (12) is provided at one end of the hollow rod (17) close to the welding table (10); a sleeve (8) is provided at one end of the annular cylinder (12) close to the welding table (10); a welding head (11) is slidably provided at one end of the sleeve (8) close to the welding table (10); and a disconnection assembly for disconnecting the connecting mechanism is provided in both sleeves (8); The connection mechanism comprises a semicircular threaded sleeve (21) symmetrically slidably arranged in a rectangular cavity (23) and cooperating with a bidirectional screw rod (9); a compression spring (22) is arranged between the semicircular threaded sleeve (21) and the rectangular cavity (23); rectangular grooves (24) are symmetrically opened on the side surface of the rectangular cavity (23); strip cavities (19) are symmetrically opened on the inner wall of the rectangular groove (24); a sealing plate (20) is slidably arranged in the strip cavity (19); the sealing plate (20) is fixedly connected to the semicircular threaded sleeve (21); a sliding plate (25) is arranged on the outer surface of the sealing plate (20); and the sliding plate (25) is slidably arranged with the rectangular groove (24); The disconnection assembly comprises a circular push plate (28) slidably arranged in the annular cylinder (12), and the circular push plate (28) is fixedly connected to the top of the welding head (11); a liquid guide groove A (18) connected to the hollow rod (17) is provided inside the connecting plate (7); a liquid guide groove B (26) connected to the rectangular groove (24) in the connecting mechanism is provided inside the sliding block (16), and one end of the liquid guide groove B (26) is located between the two sliding plates (25); the liquid guide groove B (26) is connected to the liquid guide groove A (18); and the annular cylinder (12), the hollow rod (17), the liquid guide groove B (26) and the liquid guide groove A (18) are all The welding head (11) is filled with hydraulic oil; when the welding head (11) contacts the plate, the slider (16) continues to move, causing the welding head (11) to move into the sleeve (8), thereby driving the circular push plate (28) to move, thereby pushing out the hydraulic oil in the annular cylinder (12), and then the hydraulic oil enters the liquid guide groove A (18) and the liquid guide groove B (26) through the hollow rod (17), and finally the hydraulic oil enters between the two sliding plates (25), causing the sliding plates (25) to move, driving the sealing plate (20) to move, thereby causing the semicircular threaded sleeve (21) to move, causing the semicircular threaded sleeve (21) to separate from the bidirectional screw rod (9), and stopping the movement of the welding head (11); A contact groove is formed on one side of the circular push plate (28) close to the welding head (11); a trigger sensor (29) cooperating with the contact groove is formed on the inner wall of the annular cylinder (12); and a control device matching the trigger sensor (29) is formed at the bottom of the front end of the resistance spot welding machine body (1) to control the on and off of the welding head (11); A liquid storage chamber (42) is provided in the slider (16), and the liquid storage chamber (42) is communicated with the liquid guide groove B (26). A movable plate (43) is slidably provided in the liquid storage chamber (42), and a micro-electric telescopic rod (41) is provided on one side of the movable plate (43). After welding is completed, the movable plate (43) is driven to move by the micro-electric telescopic rod (41), thereby pumping the hydraulic oil in the liquid guide groove B (26) into the liquid storage chamber (42), thereby reducing the pressure in the liquid guide groove B (26), and the semicircular threaded sleeve (21) contacts the bidirectional screw rod (9) under the action of the extrusion spring (22).

2. A resistance spot welding tool according to claim 1, characterized in that: One end of one of the strip-shaped cavities (19) is provided with a mounting groove, a limiting groove is provided in the middle of the mounting groove, a fixing rod (38) is movably provided in the mounting groove, and one end of the fixing rod (38) extends into the strip-shaped cavity (19), a limiting plate (39) is provided on the outer wall of the fixing rod (38), and the limiting plate (39) and the limiting groove are slidably arranged, a return spring (40) is sleeved on the outer wall of the fixing rod (38) between the limiting plate (39) and the limiting groove, a fixing groove is provided on the inner wall of the rectangular frame (6) to cooperate with the fixing rod (38), and the bottom surfaces of one of the sealing plate (20) and the fixing rod (38) are both inclined surfaces, and when the sealing plate (20) moves, it pushes the fixing rod (38) to move, and the fixing rod (38) is inserted into the fixing groove to fix the slider (16).

3. A resistance spot welding tool according to claim 2, characterized in that: The sealing plate (20) and the strip-shaped cavity (19) are arranged in a dynamic sealing structure, wherein a sliding groove is provided in one of the sealing plates (20), and a baffle (27) is provided on the side of the other sealing plate (20) to cooperate with the sliding groove, and the baffle (27) and the sliding groove are arranged in a dynamic sealing structure.

4. A resistance spot welding tool according to claim 1, characterized in that: The cleaning mechanism comprises a protective shell (13) arranged on the bottom surface of the resistance spot welding machine body (1); the bottom of the bidirectional screw rod (9) movably penetrates into the protective shell (13) and is provided with a disc (31); a short column (32) is provided at the edge of the bottom surface of the disc (31); an annular plate (33) is movably provided on the outer wall of the short column (32); a sealing box (14) is provided on the bottom surface of the resistance spot welding machine body (1); a piston (36) is movably provided in the sealing box (14); a connecting rod (34) is provided on one side surface of the annular plate (33); and one end of the connecting rod (34) movably penetrates into the sealing box (14) and is fixedly connected to the piston (36). The sealing box (14) is provided with an air inlet pipe (37) at both ends of one side edge, and a one-way air inlet valve (35) is provided on the outer wall of the air inlet pipe (37). A connecting pipe (4) is provided on one side surface of the resistance spot welding machine body (1). An air outlet pipe (15) connected to the connecting pipe (4) is provided at both ends of the other side edge of the sealing box (14), and a one-way air outlet valve (30) is provided on the outer wall of the air outlet pipe (15). Two air guide pipes (3) are provided on one end surface of the connecting pipe (4), and one end of the air guide pipe (3) is located obliquely above the welding port (5), and the other end of the air guide pipe (3) is located inside the welding port (5).

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