Metal piece welding device capable of achieving automatic butt joint and welding method

Abstract

The invention discloses a metal part welding device capable of achieving automatic butt joint and a welding method, and relates to the technical field of butt welding machines, the metal part welding device comprises a control box placed on the ground, the top of the control box is slidably connected with two symmetrically-distributed translation plates, and an electric control module is integrated in the control box; moving sleeves are fixedly connected to the top of the translation plate, the moving sleeves and the translation plate are distributed in parallel, a rotating shaft is rotationally connected between the two moving sleeves, and the two ends of the rotating shaft are rotationally connected to the interiors of the two moving sleeves correspondingly. According to the metal piece welding device capable of achieving automatic butt joint and the welding method, linear displacement of the translation plate is converted into rotating motion of the rotating shaft and the rotating arm fixed to the rotating shaft, so that after the end faces of the metal pieces are aligned, the grinding pieces can automatically execute section grinding before welding without additional driving, and when the metal pieces are finally pressed and welded, the grinding pieces are not prone to being damaged. And the rotating arm can be automatically rotated to avoid, so that the welding area is prevented from being interfered, and the automation level and the efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of butt welding machines, and in particular to a metal parts welding device and a welding method capable of automatically butting metal parts. Background Art

[0002] The automatic butt welding device for metal parts is also called a butt welding machine. A butt welding machine is a device used for metal welding. Its main function is to heat the contact surface of two metal parts to a molten state, and then pressurize the two parts to firmly combine them together to achieve a reliable welding connection.

[0003] To achieve the above-mentioned functions, a prior art Chinese patent (CN119115348A) discloses a butt welding machine comprising a frame, on which a first welding assembly and a second welding assembly are mounted. The first welding assembly and the second welding assembly each include a support base, on which a support frame is mounted. The support frame is provided with a movable jaw, and the support base is provided with a fixed jaw. The support base of the second welding assembly is fixedly connected to the frame, and the support base of the first welding assembly slidably engages with the frame. The movable jaw includes a movable base and a connecting base, with a conductive member disposed between the movable base and the connecting base. When a workpiece is placed over the fixed jaws of the first and second welding assemblies, the movable jaws of the first and second welding assemblies move downward to compress the workpiece. When the conductive member is energized, the portion of the workpiece to be welded melts, and the movement of the first welding assembly squeezes the molten weld seam together, completing the welding of the workpiece. Based on this, the welding speed can be increased, the strength of the weld can be enhanced, and the phenomena of pores and false welds in the weld can be effectively overcome. In addition, a Chinese patent of the prior art (CN102489905A) discloses a straight pipe butt welding machine, which includes: a telescopic mechanism provided on the straight pipe butt welding machine and located on the pipe outlet side, which can be telescopic along the straight pipe transmission direction, and a movable cutting frame movably connected to the telescopic mechanism. When defects occur in welding, the straight pipe butt welding machine can immediately set up a movable cutting frame for placing the cutting machine, and promptly process the problem workpiece before welding, thereby improving the pass rate of the workpiece before leaving the platform. At the same time, it eliminates the process of lifting the workpiece back and forth by a crane, especially saving the transportation time and equipment space required for long pipes, avoiding safety hazards, and reducing manpower and material resources.

[0004] The working principle of a butt welding machine is usually to generate resistance heat on the metal contact surface through electric current, heating the contact surface to a molten state, and then firmly fuse the two parts of metal by applying pressure to form a solid weld. Before welding, the connecting part of the metal butt surface needs to be polished to remove the oxide layer and impurities to ensure the welding quality. The steps of polishing the metal butt surface are mostly done manually, resulting in low work efficiency. In addition, the residue generated during the welding process is inconvenient to clean, which also affects the overall work efficiency and quality. Summary of the Invention

[0005] The purpose of the present invention is to provide a metal welding device and a welding method that can automatically connect metal parts, so as to solve the problem that the steps of grinding the metal connecting surfaces in the above-mentioned background technology are mostly completed manually, resulting in low work efficiency. In addition, the residue generated during the welding process is inconvenient to clean, which also affects the overall work efficiency and quality.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a metal welding device capable of automatic docking, comprising a control box placed on the ground, two symmetrically distributed translation plates being slidably connected to the top of the control box, and an electric control module being integrated inside the control box; A motion sleeve is fixedly connected to the top of the translation plate, and the motion sleeve and the translation plate are distributed in parallel. A rotating shaft is rotatably connected between the two motion sleeves, and the two ends of the rotating shaft are rotatably connected to the inside of the two motion sleeves. The outside of the rotating shaft is fixedly connected to guide blocks distributed at equal distances. The inside of the motion sleeve is provided with a sliding groove distributed in a spiral structure, and the guide block is slidably connected to the inside of the sliding groove, and the two ends of the sliding groove are vertically distributed. A cleaning structure for removing residues is provided between the two translation plates, and a clamping structure for clamping with metal parts is installed on the top of the two translation plates.

[0007] Preferably, a rotating arm is fixedly connected in the middle of the rotating shaft, and the rotating arm is configured to rotate within the range of 0°-90°, and the rotating arm and the translation plate are distributed parallel to each other in the initial state, and grinding plates are rotatably connected on both sides of the end of the rotating arm away from the rotating shaft, and the grinding plates are driven by a motor located at the end of the rotating arm.

[0008] Preferably, a support seat is fixedly connected to the middle of the top of the control box, and the middle of the rotating shaft is rotatably connected to the inside of the support seat, the top of the control box is fixedly connected to a guide rail, the bottom of the translation plate is fixedly connected to a slider, both sides of the bottom of the slider are rotatably connected to symmetrically distributed pulleys, and the slider is slidably connected to the outside of the guide rail, and the pulleys are rotatably connected to both sides of the guide rail.

[0009] Preferably, the top of the control box is rotatably connected to a screw rod through a bearing seat, and the thread directions at both ends of the screw rod are opposite. One end of the bottom of the translation plate is fixedly connected to a drive block, and the two drive blocks are respectively threadedly connected to the outer sides of the two ends of the screw rod.

[0010] Preferably, a worm wheel is fixedly connected in the middle of the lead screw, a worm is meshed on the outside of the worm wheel, the worm is driven by a motor located inside the control box, and the worm and the electronic control module are connected to each other.

[0011] Preferably, the cleaning structure includes an air cylinder fixedly connected between two translation plates, the output end of the air cylinder is fixedly connected to an air pipe, the end of the air pipe away from the air cylinder is fixedly connected to a compression tank, the output end of the compression tank is fixedly connected to an exhaust pipe, and a pressure valve is provided between the compression tank and the exhaust pipe.

[0012] Preferably, the exhaust pipe is fixedly connected to a diverter pipe at one end away from the compression tank, and nozzles are evenly distributed on one side of the diverter pipe. A telescopic fabric is fixedly connected between the two translation plates, and the nozzle is located on the top of the telescopic fabric. The diverter pipe and the nozzle are both located on the top of the translation plate and do not interfere with each other.

[0013] Preferably, the clamping structure includes a fixed plate fixedly connected to the top of the translation plate, and the fixed plate is vertically distributed on the top of the translation plate, and an oil cylinder is fixedly connected to one side of the top of the fixed plate.

[0014] Preferably, the telescopic end of the oil cylinder is detachably connected to an upper clamping block, and one end of the top of the translation plate is detachably connected to a lower clamping block, and the lower clamping block and the upper clamping block are aligned with each other.

[0015] A welding method for a metal parts welding device capable of automatic docking, the specific method steps are as follows: S1: Place the two metal parts to be welded on top of the translation plate and clamp them with the upper and lower clamping blocks of the clamping structure to ensure that the butt ends of the metal parts are aligned with each other and fit the grinding sheet; S2: The electronic control module controls the worm to drive the worm wheel, which drives the screw to rotate, so that the drive blocks at both ends with opposite thread directions push the translation plate to slide inward along the guide rail synchronously; S3: When the translation plate moves, the motion sleeve fixed on its top moves with it; the guide block slides in the spiral groove, forcing the shaft to rotate 0°-90° around the support seat, driving the grinding disc at the end of the rotating arm to grind the welding end surface of the metal part; S4: When the translation plate reciprocates, the compressed gas from the inflator is fed into the compression tank through the gas pipe. When the pressure in the tank reaches the pressure valve threshold, the high-pressure gas is ejected from the nozzle through the exhaust pipe and the diverter pipe to purge the residue in the welding area. S5: When the translation plates approach each other, the motion sleeve slides to make the guide block move along the vertical section of the slide slot, and the rotating shaft drives the grinding disc to move up to the avoidance position; S6: The translation plate continuously applies pressure to the opposite sides, so that the end faces of the metal parts are closely fitted together, and current is passed to heat and melt the end faces to complete the welding; S7: After welding is completed, the translation plate moves outward to the initial separation position, and the grinding sheet rotates along with the shaft to return to the horizontal state.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This device and method for automatically docking metal parts converts the linear displacement of a translation plate into the rotational motion of a rotating shaft and a rotating arm fixed thereon, so that after the end faces of the metal parts are aligned, the grinding disc can automatically perform cross-section grinding before welding without the need for additional drive. When the metal parts are finally pressed and welded, the rotating arm can automatically rotate up to avoid interference with the welding area, thereby improving the level of automation and efficiency.

[0017] The air is compressed by the inflator cylinder naturally driven by the reciprocating motion of the translation plate. After energy storage and pressurization, it is controlled by the pressure valve. When needed, the high-pressure airflow is automatically triggered and concentratedly sprayed through the nozzle array to promptly remove metal residues and spatters in the welding or grinding area.

[0018] The clamping structure adopts the upper and lower clamping blocks driven by oil cylinders, which ensures the stability and positioning accuracy of metal parts clamping. The detachable design of the upper and lower clamping blocks greatly improves the maintenance convenience and applicability of the equipment, and facilitates the rapid replacement of the appropriate clamping blocks according to the shape of the welding workpiece, thereby enhancing the versatility and flexibility of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the rear structure of the present invention; Figure 3 This is a schematic diagram of the top structure of the control box of the present invention; Figure 4 This is a schematic diagram of the top structure of the translation plate of the present invention; Figure 5 This is a schematic diagram of the exploded structure of the sports glove of the present invention; Figure 6 This is a schematic diagram of the bottom structure of the translation plate of the present invention; Figure 7 This is a schematic diagram of the slider structure of the present invention; Figure 8 This is a structural diagram of the inflator of the present invention; Figure 9 This is a schematic diagram of the structure of the stretch fabric of the present invention; Figure 10 This is a structural schematic diagram of the fixing plate of the present invention.

[0020] In the figure: 1. Control box; 2. Translation plate; 3. Moving sleeve; 4. Rotating shaft; 5. Guide block; 6. Slide groove; 7. Rotating arm; 8. Grinding disc; 9. Support seat; 10. Guide rail; 11. Slider; 12. Pulley; 13. Screw; 14. Drive block; 15. Worm gear; 16. Worm; 17. Inflator; 18. Air pipe; 19. Compression tank; 20. Exhaust pipe; 21. Diverter pipe; 22. Nozzle; 23. Telescopic fabric; 24. Fixed plate; 25. Cylinder; 26. Upper clamping block; 27. Lower clamping block. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figure 1 - Figure 7 The present invention provides the following technical solutions: a metal welding device that can automatically dock, comprising a control box 1 placed on the ground, with two symmetrically distributed translation plates 2 slidably connected to the top of the control box 1, and an electronic control module integrated inside the control box 1; a moving sleeve 3 is fixedly connected to the top of the translation plate 2, and the moving sleeve 3 and the translation plate 2 are distributed in parallel, a rotating shaft 4 is rotatably connected between the two movement sleeves 3, and the two ends of the rotating shaft 4 are rotatably connected to the inside of the two movement sleeves 3, and the outside of the rotating shaft 4 is fixedly connected to equidistantly distributed guide blocks 5, and the inside of the movement sleeve 3 is provided with a spirally distributed slide 6, and the guide block 5 is slidably connected to the inside of the slide 6, and the two ends of the slide 6 are vertically distributed; a cleaning structure for removing residues is provided between the two translation plates 2, and a clamping structure for clamping metal parts is installed on the top of the two translation plates 2; a rotating arm 7 is fixedly connected in the middle of the rotating shaft 4, and the rotating arm 7 is configured to rotate within the range of 0°-90°, and the initial state of the rotating arm 7 is parallel to the translation plate 2. The worm gear 15 is fixedly connected to the middle of the screw shaft 13, and the worm gear 16 is engaged with the worm gear 16 on the outside of the worm gear 16. The worm gear 16 is driven by the motor inside the control box 1 and the worm gear 16 is engaged with the outside of the worm gear 16. The worm gear 16 is driven by the motor inside the control box 1 and the worm gear 16 is engaged with the worm gear 16. The worm gear 16 is driven by the motor inside the control box 1 and the worm gear 16 is engaged with the worm gear 16.

[0023] When in use, first fix the butt ends of the metal parts to the ends of the two translation plates 2 through the clamping structure respectively. At this time, the butt ends of the two metal parts are aligned with each other, and the welding end faces of the two metal parts and the grinding sheets 8 are fit together. At this time, the two translation plates 2 remain in the farthest state, and the two translation plates 2 move relative to each other on the top of the control box 1 through a sliding connection. The guide rail 10 on the top of the control box 1 provides a sliding path, and the slider 11 at the bottom of the translation plate 2 rolls in contact with the outside of the guide rail 10 through the pulleys 12 on both sides to ensure smooth and stable linear motion.

[0024] The screw 13 is rotatably connected through the bearing seat at the top of the control box 1, and the threads at both ends are in opposite directions, so that the two drive blocks 14 move relative to or apart under the action of the threads. The worm 16 is driven by the motor inside the control box 1, and the electronic control module sends a signal to start the rotation of the worm 16, thereby driving the worm wheel 15 to rotate. The worm wheel 15 is fixed in the middle of the screw 13. When the worm wheel 15 rotates, the screw 13 rotates accordingly, driving the two drive blocks 14 to move on the threads of the screw 13. Since the drive block 14 is fixedly connected to the bottom of the translation plate 2, the translation plate 2 can be synchronously adjusted inward or outward according to the direction of the thread. The electronic control module monitors the rotation angle and position feedback signal of the screw 13 to ensure that the translation plate 2 moves within the set distance.

[0025] The rotation of the rotating shaft 4 drives the rotating arm 7 to move within the range of 0°-90°, and cooperates with the grinding sheet 8 to grind the welding section of the metal parts before welding. The moving sleeve 3 is fixed on the top of the translation plate 2, and the two are kept parallel. The two ends of the rotating shaft 4 are respectively connected to the inside of the moving sleeve 3, and the guide block 5 is fixed to the outside of the rotating shaft 4. When the two translation plates 2 approach each other, the moving sleeve 3 will slide on the outside of the rotating shaft 4. Since the guide block 5 on the outside of the rotating shaft 4 is slidably connected to the inside of the slide groove 6, the spiral shape of the slide groove 6 guides the guide The block 5 slides along the spiral path, and then drives the rotating shaft 4 to rotate with the support seat 9 as the center through the guide block 5. When the end faces of the two metal parts contact each other, the rotating shaft 4 will drive the rotating arm 7 and the grinding sheet 8 to move upward so that they do not interfere with the docking of the two metal parts. After the metal parts are polished by the grinding sheet 8, they are driven by the two translation plates 2 and the clamping structure to approach each other until they fit together. At this time, the end faces of the metal parts are melted by heating with electric current for welding, and relative force is applied to the two metal parts during welding through the translation plate 2.

[0026] Example 2: Based on Example 1, please refer to Figure 8 and Figure 9, a cleaning structure is also disclosed, and its specific structure is as follows: the cleaning structure includes an air cylinder 17 fixedly connected between the two translation plates 2, the output end of the air cylinder 17 is fixedly connected to an air supply pipe 18, the end of the air supply pipe 18 away from the air cylinder 17 is fixedly connected to a compression tank 19, the output end of the compression tank 19 is fixedly connected to an exhaust pipe 20, and a pressure valve is provided between the compression tank 19 and the exhaust pipe 20, the end of the exhaust pipe 20 away from the compression tank 19 is fixedly connected to a diversion pipe 21, and one side of the diversion pipe 21 is provided with nozzles 22 equidistantly distributed, a telescopic fabric 23 is fixedly connected between the two translation plates 2, and the nozzle 22 is located on the top of the telescopic fabric 23, and the diversion pipe 21 and the nozzle 22 are both located on the top of the translation plate 2 and do not interfere with each other.

[0027] During the operation of the equipment, the two translation plates 2 need to be frequently protected from reciprocating movement away from or approaching each other. During the reciprocating movement of the translation plate 2, the inflation cylinder 17 will be driven to contract, and then the air will be continuously supplied to the inside of the compression tank 19 through the air pipe 18, and the gas will be pressurized inside the compression tank 19. The compression tank 19 serves as an intermediate storage container, and its output end is connected to the exhaust pipe 20. A pressure valve is provided between the two. The pressure valve has a preset threshold to ensure that when the pressure in the compression tank 19 accumulates to the set value, the pressure valve automatically opens to release the high-pressure airflow into the exhaust pipe 20.

[0028] When high-pressure gas enters the manifold 21, it is evenly distributed to each nozzle 22, forming a high-speed jet beam. The telescopic fabric 23 is fixedly connected between the translating plates 2. Its material structure allows it to move and expand with the translating plates 2. The nozzles 22 are located on top of the telescopic fabric, which neither hinders the fabric's expansion and contraction nor prevents debris from splashing. The high-pressure airflow from the nozzles 22 is directly aimed at the welding or grinding area and the top of the telescopic fabric 23, blowing away any debris.

[0029] Example 3: Based on Example 1 and Example 2, please refer to Figure 10 , a clamping structure is also disclosed, and its specific structure is as follows: the telescopic end of the cylinder 25 is detachably connected to the upper clamping block 26, and the top end of the translation plate 2 is detachably connected to the lower clamping block 27, and the lower clamping block 27 and the upper clamping block 26 are aligned with each other.

[0030] The oil cylinder 25 is fixed on the top of the translation plate 2, and its telescopic end is detachably connected to the upper clamping block 26. The upper clamping block 26 is retracted to the upper high position in the initial position to avoid interference with the placement of metal parts. When clamping, the oil cylinder 25 extends to drive the upper clamping block 26 to press down, positioning the metal part between the upper clamping block 26 and the lower clamping block 27. The detachable design of the upper clamping block 26 and the lower clamping block 27 allows for quick replacement of damaged ones, so as to adapt to metal parts of different shapes.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A metal welding device capable of automatically docking, comprising a control box (1) placed on the ground, wherein the top of the control box (1) is slidably connected to two symmetrically distributed translation plates (2), and an electric control module is integrated inside the control box (1); Its characteristics are: The top of the translation plate (2) is fixedly connected to a motion sleeve (3), the motion sleeve (3) and the translation plate (2) are parallel, a rotating shaft (4) is rotatably connected between the two motion sleeves (3), and the two ends of the rotating shaft (4) are respectively rotatably connected to the inside of the two motion sleeves (3), the outside of the rotating shaft (4) is fixedly connected to guide blocks (5) distributed at equal intervals, the inside of the motion sleeve (3) is provided with a sliding groove (6) distributed in a spiral structure, and the guide block (5) is slidably connected to the inside of the sliding groove (6), and the two ends of the sliding groove (6) are vertically distributed; A cleaning structure for removing residues is provided between the two translation plates (2), and a clamping structure for clamping metal parts is installed on the top of the two translation plates (2).

2. The metal welding device capable of automatic docking according to claim 1, characterized in that: A rotating arm (7) is fixedly connected to the middle of the rotating shaft (4), and the rotating arm (7) is configured to rotate within a range of 0°-90°, and the rotating arm (7) and the translation plate (2) are initially arranged parallel to each other, and grinding plates (8) are rotatably connected to both sides of one end of the rotating arm (7) away from the rotating shaft (4), and the grinding plates (8) are driven by a motor located at the end of the rotating arm (7).

3. The metal welding device capable of automatic docking according to claim 2, characterized in that: The control box (1) is fixedly connected to a support seat (9) in the middle of the top, and the rotating shaft (4) is rotatably connected to the inside of the support seat (9). The control box (1) is fixedly connected to a guide rail (10) at the top, and the translation plate (2) is fixedly connected to a slider (11) at the bottom. Both sides of the bottom of the slider (11) are rotatably connected to symmetrically distributed pulleys (12), and the slider (11) is slidably connected to the outside of the guide rail (10), and the pulleys (12) are rotatably connected to both sides of the guide rail (10).

4. The metal welding device capable of automatic docking according to claim 3, characterized in that: The top of the control box (1) is rotatably connected to a screw rod (13) via a bearing seat, and the threads at both ends of the screw rod (13) are in opposite directions. One end of the bottom of the translation plate (2) is fixedly connected to a driving block (14), and the two driving blocks (14) are respectively threadedly connected to the outer sides of both ends of the screw rod (13).

5. The metal welding device capable of automatic butt-jointing according to claim 4, characterized in that: A worm wheel (15) is fixedly connected to the middle of the lead screw (13), and a worm (16) is meshed with the outside of the worm wheel (15). The worm (16) is driven by a motor located inside the control box (1), and the worm (16) and the electronic control module are connected to each other.

6. The metal welding device capable of automatic docking according to claim 1, characterized in that: The cleaning structure comprises an air cylinder (17) fixedly connected between the two translation plates (2), an output end of the air cylinder (17) fixedly connected to an air delivery pipe (18), an end of the air delivery pipe (18) away from the air cylinder (17) fixedly connected to a compression tank (19), an output end of the compression tank (19) fixedly connected to an exhaust pipe (20), and a pressure valve provided between the compression tank (19) and the exhaust pipe (20).

7. The metal welding device capable of automatic docking according to claim 6, characterized in that: One end of the exhaust pipe (20) away from the compression tank (19) is fixedly connected to a diverter pipe (21), and one side of the diverter pipe (21) is provided with nozzles (22) distributed equidistantly. A telescopic fabric (23) is fixedly connected between the two translation plates (2), and the nozzles (22) are located on top of the telescopic fabric (23). The diverter pipe (21) and the nozzles (22) are both located on top of the translation plates (2) and do not interfere with each other.

8. The metal welding device capable of automatic docking according to claim 1, characterized in that: The clamping structure comprises a fixed plate (24) fixedly connected to the top of the translation plate (2), and the fixed plate (24) is vertically distributed on the top of the translation plate (2), and an oil cylinder (25) is fixedly connected to one side of the top of the fixed plate (24).

9. The metal welding device capable of automatic docking according to claim 8, characterized in that: The telescopic end of the oil cylinder (25) is detachably connected to an upper clamping block (26), and one end of the top of the translation plate (2) is detachably connected to a lower clamping block (27), and the lower clamping block (27) and the upper clamping block (26) are aligned with each other.

10. The metal welding device capable of automatic docking according to claim 9, characterized in that: A welding method of the welding device is also disclosed, and the specific method steps are as follows: S1: Place the two metal parts to be welded on top of the translation plate (2) respectively, and clamp them with the upper clamping block (26) and the lower clamping block (27) of the clamping structure to ensure that the butt ends of the metal parts are aligned with each other and fit with the grinding sheet (8); S2: The electronic control module controls the worm (16) to drive the worm wheel (15), which drives the screw (13) to rotate, so that the driving blocks (14) at both ends with opposite thread directions push the translation plate (2) to slide inward along the guide rail (10) synchronously; S3: When the translation plate (2) moves, the motion sleeve (3) fixed on the top thereof moves with it; the guide block (5) slides in the spiral groove (6), forcing the rotating shaft (4) to rotate 0°-90° with the support seat (9) as the axis, driving the grinding piece (8) at the end of the rotating arm (7) to grind the welding end surface of the metal part; S4: When the translation plate (2) reciprocates, the compressed gas in the inflator (17) is input into the compression tank (19) through the gas pipe (18); when the pressure in the tank reaches the pressure valve threshold, the high-pressure gas is ejected from the nozzle (22) through the exhaust pipe (20) and the diverter pipe (21) to purge the residue in the welding area; S5: When the translation plates (2) approach each other, the movement sleeve (3) slides to make the guide block (5) move along the vertical section of the slide groove (6), and the rotating shaft (4) drives the grinding plate (8) to move up to the avoidance position; S6: The translation plate (2) continuously applies pressure to the opposite sides, so that the end faces of the metal parts are closely fitted together, and current is passed to heat and melt the end faces to complete the welding; S7: After the welding is completed, the translation plate (2) moves outward to the initial separation position, and the grinding plate (8) rotates along with the rotating shaft (4) and returns to the horizontal state.

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