A laser welding device for precision metal part processing

Abstract

The application relates to the technical field of laser welding, in particular to a laser welding device for precise metal part machining, which comprises an operation table and a driving rod, one end of the driving rod away from the operation table is fixedly connected with a mounting block, a cleaning mechanism is arranged in the mounting block, the cleaning mechanism comprises a sliding rod, a U-shaped box, a rotating rod and a rotating roller, a plurality of mounting cavities are arranged on the inner side wall of the mounting block, the cooperation of the rotating roller, a sealing cavity and a spraying cavity can remove the oxide layer and rust marks through brushing at the same time, the impurities brushed off can be blown away by using the heated gas, the to-be-welded position is preheated by the hot air flow at the same time of brushing, the preheating is carried out at the same time of cleaning, and welding is carried out immediately after the cleaning and preheating, the welding efficiency is ensured, secondary pollution is avoided, the welding quality is ensured, and the laser welding device is suitable for precise part laser welding.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to a laser welding apparatus for precision metal parts processing. Background Technology

[0002] In production and processing, various metal parts are required and need to be welded. Laser welding uses a high-energy-density laser beam as a heat source to heat the surface of the workpiece, causing the heat to diffuse inward through conduction, melting the workpiece and forming a specific molten pool. It is mostly used in precision welding. In order to maintain the precision of the welding and avoid the formation of pores, the surface of the workpiece needs to be polished to remove the oxide layer and oil stains. Preheating is also required to remove hydrogen and avoid excessively rapid cooling that could cause thermal stress and cracks.

[0003] In the existing technology, welding of round tubes requires welding from the inside in order to ensure the quality of the welding. The internal treatment and preheating of the round tube need to be carried out in multiple steps. After grinding, reheating can easily cause secondary contamination, which reduces the welding efficiency and cannot maintain the welding quality. At the same time, it is not easy to preheat the welding position inside the round tube locally, and preheating it from the outside is a waste of energy. Summary of the Invention

[0004] The purpose of this invention is to address the following shortcomings in the prior art: In order to ensure the quality of welding, the welding of round tubes in the prior art requires welding from the inside, and the internal processing and preheating of the round tubes need to be carried out in multiple steps. After grinding, reheating can easily cause secondary contamination, which reduces welding efficiency and cannot maintain welding quality. At the same time, it is not easy to preheat the welding position inside the round tube locally, and preheating it from the outside is a waste of energy. Therefore, this invention proposes a laser welding device for precision metal parts processing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A laser welding device for precision metal parts processing includes an operating table and a drive rod, wherein the drive rod is rotatably connected to the operating table, and a mounting block is fixedly connected to one end of the drive rod away from the operating table; The mounting block is equipped with a cleaning mechanism, which includes a sliding rod, a U-shaped box, a rotating rod, and a rotating roller. Multiple mounting cavities are opened on the inner side wall of the mounting block. Multiple sliding rods are respectively installed on the mounting block in a circular array. Multiple U-shaped boxes are respectively fixedly connected to the end of the sliding rod away from the mounting block. The rotating rod is rotatably connected to the side wall of the U-shaped box. The rotating roller is fixedly connected to the outer surface of the rotating rod. The U-shaped box is equipped with a preheating mechanism, which includes partitions, connecting rods, magnetic blocks, and copper rings. Two partitions are fixedly connected to the inner sidewalls of the U-shaped box, and the connecting rods are rotatably connected to the sidewalls of the partitions. Multiple magnetic blocks are arranged in a ring array on the outer surface of the connecting rods, and the copper rings are fixedly connected to the inner sidewalls of the U-shaped box.

[0006] Preferably, a first gear is fixedly connected to the side wall of the rotating rod, an adjusting rod is rotatably connected to the inner side wall of the U-shaped box, a second gear is fixedly connected to the side wall of the adjusting rod, the first gear and the second gear are meshed together, an adjusting disc is fixedly connected to the outer surface of the adjusting rod, and a belt is sleeved between the adjusting disc and the connecting rod.

[0007] Preferably, the inner sidewall of the U-shaped box is fixedly connected to two ends of a sealing cavity, a piston plate is slidably connected to the inner sidewall of the sealing cavity, a push rod is fixedly connected to the sidewall of the piston plate, and the push rod is slidably connected to one sidewall of the sealing cavity.

[0008] Preferably, a disc is fixedly connected to both ends of the side wall of the connecting rod, and a connecting rod is hinged between the disc and the push rod. Multiple heat-conducting plates are installed in a linear array on the inner side wall of the copper ring.

[0009] Preferably, a U-shaped plate is fixedly connected to the end of the slide rod away from the disc, an I-shaped block is slidably connected to the inner side wall of the U-shaped plate, a limit rod is fixedly connected to the side wall of the I-shaped block, and multiple limit rods are slidably connected to the mounting block respectively.

[0010] Preferably, an adjusting ring is fixedly connected to the end of the limiting rod away from the I-shaped block, and a screw is rotatably connected to the side wall of the mounting block, the screw being threadedly connected to the adjusting ring.

[0011] Preferably, a plurality of square plates are fixedly connected to the side wall of the drive rod, the screw is rotatably connected to the plurality of square plates, a worm wheel is fixedly connected to the outer surface of the screw, a worm is rotatably connected to the square plate near the worm wheel, the worm is meshed with the worm wheel, and a turntable is provided on the side wall of the worm.

[0012] Preferably, an air inlet pipe and an air outlet pipe are fixedly connected to the two sealed cavities respectively. Each air inlet pipe and the air outlet pipe is equipped with a one-way valve. The other end of the air inlet pipe near the first gear is fixedly connected to the U-shaped box, and the other end of the air outlet pipe near the first gear is fixedly connected to the partition plate near the first gear. The other end of the air inlet pipe away from the first gear is fixedly connected to the partition plate away from the first gear. A spray chamber is fixedly connected to the upper end face of the U-shaped box, and the air outlet pipe away from the first gear is fixedly connected to the spray chamber. A welding component is fixedly connected to the mounting block.

[0013] Compared with the prior art, the beneficial effects of the present invention are: By combining the rotating rollers, sealing chamber, and spray chamber, the grinding and brushing motion removes the oxide layer and rust while the heated gas blows away the brushed impurities. The hot airflow and brushing motion simultaneously preheat the area to be welded. Preheating is performed while cleaning, and welding is carried out immediately after cleaning and preheating. This ensures welding efficiency while avoiding secondary contamination and guaranteeing welding quality. It is suitable for laser welding of precision parts.

[0014] By combining structures such as sealed chambers and spray chambers, external gas is continuously drawn in, heated, and blown toward the area brushed by the rotating roller. This blows away the oxide layer, rust, and other impurities brushed off by the wire brush on the rotating roller from the welding position, improving the cleaning effect and preventing impurities from boiling and generating steam, which could cause porosity at the welding position.

[0015] 3. By adjusting the structure of the ring, screw, square plate, etc., the roller can adapt to the cleaning and preheating of round tubes of different diameters, avoiding cracks caused by excessive cooling of high carbon steel and alloy steel, or hydrogen embrittlement caused by insufficient drying. It has a wide range of applications and only heats the welding position locally from the inside, which is more energy-saving and environmentally friendly.

[0016] 4. The heating device operates by using the friction between the rotating roller and the inside of the circular tube to drive the rotating rod. The rotation speed of the rotating roller is amplified by the cooperation of two sets of gears and the adjusting plate, which causes the connecting rod to rotate at high speed and drive the magnetic force to rotate. Eddy currents are generated in the copper sheet to generate heat, which is then fully in contact with the air through the heat-conducting plate, quickly heating the air and thus preheating the inside of the circular tube. No additional heating components or power supply are required, making it more energy-efficient and environmentally friendly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the operating table structure of a laser welding device for precision metal parts processing proposed in this invention; Figure 2 This is a schematic diagram of the drive rod structure of a laser welding device for precision metal parts processing proposed in this invention; Figure 3This is a schematic diagram of the adjustment ring structure of a laser welding device for precision metal parts processing proposed in this invention; Figure 4 This is a schematic diagram of the partition structure of a laser welding device for precision metal parts processing proposed in this invention; Figure 5 This is a schematic diagram of the U-shaped box structure of a laser welding device for precision metal parts processing proposed in this invention; Figure 6 for Figure 1 A magnified schematic diagram of the structure of part A in the diagram; Figure 7 for Figure 3 A magnified schematic diagram of the partial structure of B in the diagram; Figure 8 for Figure 5 A magnified schematic diagram of the structure of C.

[0018] In the diagram: 1. Operating platform, 2. Drive rod, 3. Mounting block, 4. Slide rod, 5. U-shaped box, 6. Rotating rod, 7. Rotating roller, 8. Partition plate, 9. Connecting rod, 10. Magnetic block, 11. Copper ring, 12. First gear, 13. Adjusting rod, 14. Second gear, 15. Adjusting disc, 16. Belt, 17. Sealing cavity, 18. Piston plate, 19. Push rod, 20. Disc, 21. Connecting rod, 22. U-shaped plate, 23. I-shaped block, 24. Limiting rod, 25. Adjusting ring, 26. Screw, 27. Square plate, 28. Worm gear, 29. Worm, 30. Inlet pipe, 31. Outlet pipe, 32. Spray chamber, 33. Welded components, 34. Heat-conducting plate. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figures 1-8 A laser welding device for precision metal parts processing includes an operating table 1 and a drive rod 2. The drive rod 2 is rotatably connected to the operating table 1. (The operating table 1 is equipped with common drive control devices such as motors, which are existing technologies and will not be described in detail here.) The end of the drive rod 2 away from the operating table 1 is fixedly connected to a mounting block 3. The mounting block 3 is equipped with a cleaning mechanism, which includes a slide rod 4, a U-shaped box 5, a rotating rod 6, and a rotating roller 7. Multiple mounting cavities are opened on the inner side wall of the mounting block 3. Multiple slide rods 4 are respectively installed in a circular array on the mounting block 3. Multiple U-shaped boxes 5 are respectively fixedly connected to the end of the slide rod 4 away from the mounting block 3. The rotating rod 6 is rotatably connected to the side wall of the U-shaped box 5. The rotating roller 7 is fixedly connected to the outer surface of the rotating rod 6. The outer surface of the rotating roller 7 is equipped with a wire brush. The U-shaped box 5 is equipped with a preheating mechanism, which includes partitions 8, connecting rods 9, magnetic blocks 10, and copper rings 11. The two partitions 8 are fixedly connected to the inner sidewalls of the U-shaped box 5, and the connecting rods 9 are rotatably connected to the sidewalls of the partitions 8. Multiple magnetic blocks 10 are arranged in a ring array on the outer surface of the connecting rods 9. The copper rings 11 are fixedly connected to the inner sidewalls of the U-shaped box 5. The rotation of the magnetic blocks 10 will generate a changing magnetic field, which will induce eddy currents and generate heat in the copper rings 11. The copper rings 11 are square tubes attached between the U-shaped box 5 and the two partitions 8. The partitions 8 and the U-shaped box 5 are made of heat-insulating material.

[0021] A first gear 12 is fixedly connected to the side wall of the rotating rod 6. An adjusting rod 13 is rotatably connected to the inner side wall of the U-shaped box 5. A second gear 14 is fixedly connected to the side wall of the adjusting rod 13. The first gear 12 and the second gear 14 are meshed together. An adjusting disc 15 is fixedly connected to the outer surface of the adjusting rod 13. A belt 16 is sleeved between the adjusting disc 15 and the connecting rod 9.

[0022] The inner sidewall of the U-shaped box 5 is fixedly connected to two ends of a sealing cavity 17. A piston plate 18 is slidably connected to the inner sidewall of the sealing cavity 17. A push rod 19 is fixedly connected to the sidewall of the piston plate 18. The push rod 19 is slidably connected to one sidewall of the sealing cavity 17. The push rod 19 and the sealing cavity 17 are not sealed.

[0023] The two ends of the side wall of the connecting rod 9 are respectively fixedly connected to the disc 20. The disc 20 and the push rod 19 are hinged to the connecting rod 21. Multiple heat-conducting plates 34 are installed in a linear array on the inner side wall of the copper ring 11. The heat-conducting plates 34 are all made of heat-conducting materials to increase the contact area with air and quickly transfer the heat of the copper ring 11 to the air, thereby quickly heating the air.

[0024] A sliding rod 4 is fixedly connected to a U-shaped plate 22 at the end away from the disc 20. An I-shaped block 23 is slidably connected to the inner side wall of the U-shaped plate 22. A limit rod 24 is fixedly connected to the side wall of the I-shaped block 23. Multiple limit rods 24 are slidably connected to the mounting block 3 respectively. An adjusting ring 25 is fixedly connected to the end of the limit rod 24 away from the I-shaped block 23. A screw 26 is rotatably connected to the side wall of the mounting block 3. The screw 26 is threadedly connected to the adjusting ring 25.

[0025] Multiple square plates 27 are fixedly connected to the side wall of the drive rod 2. The screw 26 is rotatably connected to the multiple square plates 27. A worm wheel 28 is fixedly connected to the outer surface of the screw 26. A worm 29 is rotatably connected to the square plate 27 near the worm wheel 28. The worm 29 has high friction with the square plate 27 and will not move automatically due to low external force or vibration. The worm 29 is meshed with the worm wheel 28. A turntable is provided on the side wall of the worm 29. A handle is provided on the turntable. The turntable is large enough to generate a high leverage effect so that human power is sufficient to drive the worm 29 to rotate.

[0026] Two sealed cavities 17 are respectively connected to an inlet pipe 30 and an outlet pipe 31. Both the inlet pipe 30 and the outlet pipe 31 are equipped with one-way valves. The other end of the inlet pipe 30, closer to the first gear 12, is fixedly connected to the U-shaped box 5. The other end of the outlet pipe 31, also closer to the first gear 12, is fixedly connected to the partition 8, which is also closer to the first gear 12. The other end of the inlet pipe 30, farther from the first gear 12, is fixedly connected to the partition 8, which is also farther from the first gear 12. A spray chamber 32 is fixedly connected to the upper surface of the U-shaped box 5. Multiple spray holes are opened on the spray chamber 32, and these holes are angled and aimed at the area swept by the rotating roller 7, causing the gas to be blown towards that area. The outlet pipe 31, farther from the first gear 12, is fixedly connected to the spray chamber 32. The flow of the one-way valve in the inlet pipe 30, closer to the first gear 12... The flow direction is from the outside to the sealed cavity 17 near the first gear 12. The flow direction of the one-way valve in the exhaust pipe 31 near the first gear 12 is from the sealed cavity 17 near the first gear 12 to the space between the U-shaped box 5 and the partition 8. The flow direction of the one-way valve in the intake pipe 30 away from the first gear 12 is from the space between the U-shaped box 5 and the partition 8 to the sealed cavity 17 away from the first gear 12. The flow direction of the one-way valve in the exhaust pipe 31 away from the first gear 12 is from the sealed cavity 17 away from the first gear 12 to the spray chamber 32. A welding component 33 is fixedly connected to the mounting block 3. (The welding component 33 includes the laser head, wire feeding mechanism, etc., which are all components of existing laser welding and are all existing technologies. Their connection methods and composition will not be described in detail here.)

[0027] In this invention, during use, the operating table 1 is used to align the drive rod 2 with the center of the circular tube. Then, the drive rod 2 and mounting block 3 are inserted into the circular tube. The U-shaped box 5 and rotating roller 7 are aligned with the position to be welded. The turntable is then rotated, driving the worm gear 29 to rotate the worm wheel 28 and screw 26. The screw 26 drives the adjusting ring 25 to move, which in turn drives the limiting rod 24 to move. The limiting rod 24 drives the I-shaped block 23 to move, causing the U-shaped plate 22 to move. This causes the sliding rod 4 to drive the U-shaped box 5 to open outwards, accommodating circular tubes of different diameters and having a wide range of applications. The box opens outwards until the rotating roller 7 maintains close contact with the inside of the circular tube, ensuring sufficient contact force. Then, the drive rod 2 is driven to rotate by the motor connected to the operating table 1. The drive rod 2 drives the mounting block 3 and the slide rod 4 to rotate. The slide rod 4 drives the U-shaped box 5 and the rotating rod 6 to rotate. The rotating rod 6 drives the rotating roller 7 to rotate. The rotating roller 7 rotates under the action of friction. The wire brush on the rotating roller 7 contacts the inside of the pipe. When rotating, it scrapes off the oxide layer, rust and other impurities on the surface of the position to be welded, so as to prevent it from vaporizing and producing pores during welding. The self-locking property of the worm gear 28 and the worm 29 ensures that the screw 26 will not loosen automatically. The friction between the worm 29 and the square plate 27 is large. The drive rod 2 rotates at a low speed, so there will be no large centrifugal force and the worm 29 will not rotate automatically when there is vibration.

[0028] As the roller 7 rotates along the inner wall of the circular tube, it rotates under the action of friction, driving the rotating rod 6 and the first gear 12 to rotate. The first gear 12 drives the second gear 14 and the adjusting rod 13 to rotate. The adjusting rod 13 drives the connecting rod 9 to rotate through the adjusting disc 15 and the belt 16. After being amplified by the large and small gears and the adjusting disc 15, the connecting rod 9 rotates at high speed. The connecting rod 9 drives the magnetic block 10 to rotate at high speed, inducing eddy currents and generating heat in the copper ring 11. Multiple heat-conducting plates 34 conduct the generated heat out and fully dissipate it into the air. Contact is made, thereby quickly heating the air inside the U-shaped box 5 and the partition 8. The connecting rod 9 drives the disc 20 to rotate, and the disc 20 drives the connecting rod 21 and the push rod 19 to reciprocate. The push rod 19 drives the piston plate 18 to reciprocate. When the piston plate 18 moves closer to the disc 20, the one-way valve in the air inlet pipe 30 opens and the one-way valve in the air outlet pipe 31 closes. Outside air enters the sealed cavity 17 near the first gear 12 through the air inlet pipe 30, and the heated gas in the U-shaped box 5 and the partition 8 enters through the air inlet pipe. When pipe 30 enters the sealed cavity 17 away from the first gear 12, and piston plate 18 moves away from disk 20, the one-way valve in inlet pipe 30 closes, and the one-way valve in outlet pipe 31 opens. Gas in sealed cavity 17 near the first gear 12 enters U-shaped box 5 and partition 8 through outlet pipe 31, while heated gas in sealed cavity 17 away from the first gear 12 enters spray chamber 32 through outlet pipe 31. From spray chamber 32, the gas is blown towards the area just brushed by rotating roller 7. As connecting rod 9 rotates continuously, the gas continuously... External gas is drawn into the U-shaped box 5 and the partition plate 8, and then ejected into the spray chamber 32. The heated gas blows away the oxide layer, rust and other impurities brushed off, keeping them away from the welding position. At the same time, the welding position is preheated. Meanwhile, the friction of the wire brush on the rotating roller 7 against the inner wall of the round tube also heats the welding position. Both heat the welding position at the same time, removing oil and other liquids from its surface and removing hydrogen to avoid hydrogen embrittlement. Secondly, it preheats the position to prevent high carbon steel or alloy steel from cracking due to the formation of martensite during rapid cooling.

[0029] After preheating, the motor on the operating table 1 is turned off. The turntable is rotated to drive the worm gear 29, causing the worm wheel 28 and the screw 26 to rotate. The screw 26 drives the adjusting ring 25 to move. The movement of the adjusting ring 25 drives the limit rod 24 to move. The limit rod 24 drives the I-shaped block 23 to move, causing the U-shaped plate 22 to move. This causes the slide rod 4 to retract the U-shaped box 5. The operating table 1 is then moved backward so that the laser head on the welding component 33 is aligned with the position to be welded. Then, the motor is started to drive the drive rod 2 to rotate, causing the welding component 33 to rotate and be welded immediately. Clean heating and welding are completed simultaneously, avoiding step-by-step operations and improving welding efficiency. During the secondary heating, the position to be welded is contaminated with impurities again, ensuring the quality of the weld and avoiding porosity, hydrogen embrittlement, and cracks. Preheating of the area around the welding point is also precise, saving energy.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laser welding device for precision metal parts processing, comprising an operating table (1) and a drive rod (2), characterized in that, The drive rod (2) is rotatably connected to the operating table (1), and a mounting block (3) is fixedly connected to one end of the drive rod (2) away from the operating table (1). The mounting block (3) is equipped with a cleaning mechanism, which includes a slide rod (4), a U-shaped box (5), a rotating rod (6), and a rotating roller (7). Multiple mounting cavities are opened on the inner side wall of the mounting block (3). Multiple slide rods (4) are respectively installed on the mounting block (3) in a circular array. Multiple U-shaped boxes (5) are respectively fixedly connected to the end of the slide rod (4) away from the mounting block (3). The rotating rod (6) is rotatably connected to the side wall of the U-shaped box (5). The rotating roller (7) is fixedly connected to the outer surface of the rotating rod (6). The U-shaped box (5) is equipped with a preheating mechanism, which includes a partition (8), a connecting rod (9), a magnetic block (10), and a copper ring (11). The two partitions (8) are fixedly connected to the inner side wall of the U-shaped box (5), the connecting rod (9) is rotatably connected to the side wall of the partition (8), and multiple magnetic blocks (10) are respectively arranged in a ring array on the outer surface of the connecting rod (9). The copper ring (11) is fixedly connected to the inner side wall of the U-shaped box (5).

2. The laser welding apparatus for precision metal parts processing according to claim 1, characterized in that, A first gear (12) is fixedly connected to the side wall of the rotating rod (6), an adjusting rod (13) is rotatably connected to the inner side wall of the U-shaped box (5), a second gear (14) is fixedly connected to the side wall of the adjusting rod (13), the first gear (12) and the second gear (14) are meshed together, an adjusting disc (15) is fixedly connected to the outer surface of the adjusting rod (13), and a belt (16) is sleeved between the adjusting disc (15) and the connecting rod (9).

3. The laser welding apparatus for precision metal parts processing according to claim 2, characterized in that, The inner walls of the U-shaped box (5) are respectively fixedly connected to sealing cavities (17). A piston plate (18) is slidably connected to the inner wall of the sealing cavity (17). A push rod (19) is fixedly connected to the side wall of the piston plate (18). The push rod (19) is slidably connected to one side wall of the sealing cavity (17).

4. The laser welding apparatus for precision metal parts processing according to claim 3, characterized in that, The two ends of the side wall of the connecting rod (9) are respectively fixedly connected to the disc (20), and the disc (20) and the push rod (19) are hinged to the connecting rod (21). Multiple heat-conducting plates (34) are installed in a linear array on the inner side wall of the copper ring (11).

5. The laser welding apparatus for precision metal parts processing according to claim 4, characterized in that, The sliding rod (4) is fixedly connected to a U-shaped plate (22) at one end away from the disc (20). An I-shaped block (23) is slidably connected to the inner side wall of the U-shaped plate (22). A limiting rod (24) is fixedly connected to the side wall of the I-shaped block (23). Multiple limiting rods (24) are slidably connected to the mounting block (3).

6. The laser welding apparatus for precision metal parts processing according to claim 5, characterized in that, An adjusting ring (25) is fixedly connected to one end of the limiting rod (24) away from the I-shaped block (23), and a screw (26) is rotatably connected to the side wall of the mounting block (3), and the screw (26) is threadedly connected to the adjusting ring (25).

7. The laser welding apparatus for precision metal parts processing according to claim 6, characterized in that, Multiple square plates (27) are fixedly connected to the side wall of the drive rod (2). The screw (26) is rotatably connected to the multiple square plates (27). A worm wheel (28) is fixedly connected to the outer surface of the screw (26). A worm (29) is rotatably connected to the square plate (27) near the worm wheel (28). The worm (29) is meshed with the worm wheel (28). A turntable is provided on the side wall of the worm (29).

8. The laser welding apparatus for precision metal parts processing according to claim 3, characterized in that, An air inlet pipe (30) and an air outlet pipe (31) are fixedly connected to the two sealed cavities (17), respectively. One-way valves are provided in both the air inlet pipe (30) and the air outlet pipe (31). The other end of the air inlet pipe (30) near the first gear (12) is fixedly connected to the U-shaped box (5). The other end of the air outlet pipe (31) near the first gear (12) is fixedly connected to the partition plate (8) near the first gear (12). The other end of the air inlet pipe (30) away from the first gear (12) is fixedly connected to the partition plate (8) away from the first gear (12). A spray chamber (32) is fixedly connected to the upper end face of the U-shaped box (5). The air outlet pipe (31) away from the first gear (12) is fixedly connected to the spray chamber (32). A welding component (33) is fixedly connected to the mounting block (3).

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