A laser seamless welding device for processing smoke exhaust valves

Abstract

This invention relates to the field of laser welding technology, specifically to a laser seamless welding device for processing a fume exhaust valve. The device includes a square valve frame composed of four frame plates, a windproof extension frame connected to one end of the square valve frame, a clamping mechanism for positioning and holding the four frame plates, a welding gun that emits laser light to the weld seam between adjacent frame plates, an inert gas regulator located on one side of the nozzle of the welding gun, and a suspension for simultaneously supporting the welding gun and the inert gas regulator. Inert gas flows above the weld pool, covering not only the weld pool at the laser welding point but also the uncooled weld pool separated from the laser. A row of hot air windows heats the flowing inert gas, thus slowing down the cooling rate of the weld pool and preventing stress problems caused by rapid cooling.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, specifically to a laser seamless welding device for processing smoke exhaust valves. Background Technology

[0002] The production and processing of smoke exhaust valves involves laser welding. Four plates are joined together to form a square smoke exhaust valve frame, and then laser welding is performed on each of the four frame edges one by one. In traditional laser welding, inert gas nozzles are arranged around the laser torch nozzle. When the welding laser hits the weld, a molten pool is formed, and the sprayed inert gas also covers the molten pool, effectively isolating it from the air. However, this inert gas spraying method has shortcomings. When the laser hits the molten pool, it gradually moves along the weld, and the sprayed inert gas moves with the laser. The molten pool does not cool and harden immediately after the laser leaves, causing the molten pool to be directly exposed to the air after separating from the laser. This leads to a series of welding defects and performance degradation problems. For example, the high-temperature molten pool reacts with oxygen or nitrogen in the air to form brittle oxides or nitrides, reducing the plasticity and toughness of the weld. In addition, the gas dissolved in the molten pool cannot completely escape, forming pores after cooling, weakening the density and strength of the weld. Or, surface oxidation causes the weld to blacken or discolor, affecting its appearance.

[0003] Therefore, the molten pool generated at the laser irradiation point, as well as the molten pool left behind after the laser advances but not cooled immediately, both require stable inert gas isolation. In addition, in traditional technology, the inert gas dispersed from the laser irradiation point will accelerate the cooling of the surrounding molten pool. This causes the molten pool separated from the laser to cool and harden too quickly, resulting in a large temperature gradient, causing significant residual stress, affecting the dimensional stability and fatigue performance of the component, or generating internal stress due to rapid shrinkage. When the stress exceeds the material's bearing capacity, it will crack. Summary of the Invention

[0004] The purpose of this invention is to provide a laser seamless welding device for processing smoke exhaust valves, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a laser seamless welding device for processing a smoke exhaust valve, comprising a square valve frame composed of four frame plates, a windproof extension frame connected to one end of the square valve frame, a clamping mechanism for positioning and holding the four frame plates, a welding gun for emitting laser light to the weld seam of adjacent two frame plates, an inert gas regulator disposed on one side of the nozzle of the welding gun, and a suspension for simultaneously supporting the welding gun and the inert gas regulator. The windproof extension frame is fixed to the clamping mechanism to rotate synchronously with the square valve frame. The inert gas regulator is distributed at the angle between the splices of the two frame plates, forming a triangular channel for inert gas flow between the inert gas regulator and the two frame plates to guide the inert gas to cover the weld pool. The inert gas regulator includes: A flat plate component fixed to the suspension, and a tail triangular plate vertically connected to one end of the flat plate component; the nozzle of the welding gun is located at the other end of the flat plate component. A hot air device is located below the flat plate component, the hot air device being used to heat the inert gas flowing in the triangular channel; An air supply device for injecting inert gas into a triangular channel is mounted on a tail triangular plate and is connected to a hot air device via a transmission mechanism.

[0006] The hot air device includes a row of hot air windows, two parallel crossbars for supporting the row of hot air windows, a screw assembly for pushing the row of hot air windows, a long conductor assembly for supplying power to the row of hot air windows, and a long shaft gear for driving the row of hot air windows. One end of the crossbar is bent and fixed to the flat plate component.

[0007] The hot air window includes a bridge plate frame that slides under the guidance of two crossbars, an electric heating wire fixed below the bridge plate frame, conductive springs fixedly connected to both ends of the electric heating wire, a triangular grille set on the leeward side of the electric heating wire, a bolt installed on the bridge plate frame, and a spring that contacts both ends of the bridge plate frame. The spring is sleeved on the crossbars. The two conductive springs simultaneously contact the long conductor assembly to energize the electric heating wire. The bolt cuts off the power to the electric heating wire by pressing one of the conductive springs. The long shaft gear drives the triangular grille to swing to avoid heat accumulation at the contact point between the triangular grille and the electric heating wire.

[0008] The air supply device includes an L-shaped pipe with one end passing through a tail triangle plate, a windmill installed in the L-shaped pipe and blown by inert gas, a windmill shaft fixed in the middle of the windmill, and a swing wheel that is driven by the end of the windmill shaft that extends to the outside of the L-shaped pipe. One end of the long shaft gear passes through the tail triangle plate and establishes a transmission with the swing wheel.

[0009] The swing wheel assembly includes an outer frame fixed to an L-shaped pipe, a worm gear and a disc shaft simultaneously supported on the outer frame, a speed-reducing gear fixed to one end of the worm gear, a turntable fixed to one end of the disc shaft, a swing plate hinged to the turntable at one end, and a double control frame hinged to the other end of the swing plate. The double control frame is equipped with a rack for transmission with a long shaft gear, and a square column is also provided on the double control frame to slide through a square hole opened in the outer frame. The speed-reducing gear is transmitted through a gear fixed to the end of the wind turbine shaft, and the other end of the worm gear is transmitted through an annular worm gear fixed to the turntable.

[0010] The flat panel component includes a main flat panel fixed to the suspension, a door panel sealing the elongated hole on the main flat panel, and a door bolt installed on the main flat panel. The door panel and the main flat panel are hinged together.

[0011] The long conductor assembly includes an insulating crossbar fixed at one end to the main plate, two long conductive plates fixed on the insulating crossbar, and wires connected to the long conductive plates. The conductive spring contacts the long conductive plates and conducts electricity.

[0012] The bolt includes a pivot pin that is movably sleeved in a through hole in the bridge plate frame, a threaded pin that drives one end of the pivot pin, a pressure plate that is screwed to the threaded pin, a rail body that guides the pressure plate to slide in a specific direction, and a tail seat that is fixed on the rail body. The tail seat supports the threaded pin, the rail body is fixed on the bridge plate frame, and the tip of the pressure plate at one end separates the conductive spring and the long conductive sheet by pressing the conductive spring.

[0013] The screw assembly includes two lead screws fixed to the ends of two crossbars, a reversing bracket sliding on the lead screws, and a nut screwed onto the lead screws. One side of the reversing bracket is blocked by the nut, and the other side of the reversing bracket is compressed by a spring.

[0014] The triangular grid includes a T-shaped frame that slides under the support of the bridge plate frame, a row of retaining plates fixed on the T-shaped frame, and a row of guide plates fixed on the back of the retaining plates. The front of the retaining plates is in contact with the heating wire, and a rack is fixed on the T-shaped frame to drive the long shaft gear.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Inert gas is circulated above the weld pool. The inert gas not only covers the weld pool at the laser welding point, but also the uncooled weld pool that is separated from the laser. The circulating inert gas is heated through a row of hot air windows. In this way, the hot inert gas covering the weld pool can slow down the cooling rate of the weld pool and avoid stress problems caused by rapid cooling of the weld pool.

[0016] 2. As the inert gas flows through a row of hot air windows, it is gradually heated. The closer the inert gas is to the laser point, the higher the temperature. Different temperatures of hot inert gas correspond to different areas of the molten pool, so as to effectively regulate the cooling of the molten pool. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 A schematic diagram showing the location of the extended frame for the windbreak.

[0019] Figure 3 This is a schematic diagram showing the position of the welding gun.

[0020] Figure 4 This is a schematic diagram of the inert gas regulator.

[0021] Figure 5 This is a schematic diagram of the flat panel component structure.

[0022] Figure 6 This is a schematic diagram showing the location of the hot air vent.

[0023] Figure 7 This is a schematic diagram of the screw assembly structure.

[0024] Figure 8This is a schematic diagram of the heating wire structure.

[0025] Figure 9 This is a schematic diagram showing the location of the triangular grille.

[0026] Figure 10 This is a schematic diagram of the main flat plate structure.

[0027] Figure 11 This is a schematic diagram of a triangular grid structure.

[0028] Figure 12 This is a schematic diagram of the air supply device.

[0029] Figure 13 This is a schematic diagram of the balance wheel structure.

[0030] Figure 14 This is a schematic diagram of the bolt fixture structure.

[0031] In the diagram: 1. Square valve frame; 101. Frame plate; 2. Windbreak extension square frame; 3. Clamping mechanism; 4. Welding gun; 5. Inert gas regulator; 6. Suspension; 7. Flat panel component; 7. Door panel; 701. Main flat panel; 702. Door bolt; 703. Rear triangular plate; 8. Hot air device; 9. Air supply device; 10. Hot air window; 11. Crossbar; 12. Screw assembly; 13. Long guide assembly; 14. Long shaft gear; 15. Heating wire; 16. Conductive spring; 17. Triangular grille; 18. Bolt clamp; 19. Spring; 20. 21. Bridge plate frame, 22. Wind wheel, 23. Wind wheel shaft, 24. Swing wheel fixture, 25. L-shaped pipe, 26. Screw, 27. Nut, 28. Reversing frame, 29. Wire, 30. Long conductive plate, 31. Insulating cross frame, 32. T-shaped frame, 33. Fixing plate, 34. Guide plate, 35. Speed ​​reduction gear, 36. Outer frame, 37. Worm gear, 38. Disc shaft, 39. Turntable, 40. Swinging plate, 41. Double control frame, 42. Adjustment column, 43. Threaded column, 44. Pressure plate, 45. Rail body, 46. Tailstock. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the technical solutions of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1 to 14This invention provides a technical solution: a laser seamless welding device for processing a smoke exhaust valve, comprising a square valve frame 1 composed of four frame plates 101, a windproof extension frame 2 connected to one end of the square valve frame 1, a clamping mechanism 3 for positioning and clamping the four frame plates 101, a welding gun 4 for emitting laser light to the weld seam of adjacent two frame plates 101, an inert gas regulator 5 disposed on one side of the nozzle of the welding gun 4, and a suspension 6 for simultaneously supporting the welding gun 4 and the inert gas regulator 5. The windproof extension frame 2 is fixed to the clamping mechanism 3 to rotate synchronously with the square valve frame 1. The inert gas regulator 5 is distributed at the angle between the joints of two frame plates 101, forming a triangular channel for inert gas flow between the inert gas regulator 5 and the two frame plates 101 to guide the inert gas to cover the weld pool, specifically guiding the inert gas to cover the weld pool left after laser welding, and the inert gas covers the weld pool at the laser irradiation point at the exhaust port of the triangular channel. (See attached drawing.) Figure 1 and attached Figure 2 Understanding: The fixture mechanism 3 is connected to a rotating mechanism on its back. The welding gun 4, during translation, emits a laser at the weld seam below, completing the weld seam between the two frame plates 101. After the suspension 6 is completed, the existing multi-axis linkage machine tool connected to one end of the suspension 6 controls the suspension 6 to be pulled out. The suspension 6 drives the welding gun 4 and the inert gas regulator 5 to leave. The rotating mechanism drives the fixture mechanism 3, which in turn drives the windbreak extension frame 2 and the square valve frame 1 to rotate synchronously, causing the new weld seam to rotate to the welding area. Subsequently, the suspension 6 drives the welding gun 4 and the inert gas regulator 5 to move to the initial welding point. The welding gun 4 emits a laser at the new weld seam and gradually advances along the weld seam until the entire weld seam is welded. Through this repositioning welding method, the welding of the four weld seams on the square valve frame 1 is completed. The inert gas regulator 5 includes: The flat plate component 7 is fixed on the suspension 6, and the tail triangular plate 8 is vertically connected to one end of the flat plate component 7. The nozzle of the welding gun 4 is located at the other end of the flat plate component 7. A hot air device 9 is installed below the flat plate component 7. The hot air device 9 is used to heat the inert gas flowing in the triangular channel. An air supply device 10 for injecting inert gas into the triangular channel is installed on the tail triangular plate 8, and the air supply device 10 is connected to the hot air device 9 in a driving connection.

[0034] Reference Appendix Figure 6 and attached Figure 7 It is understood that the hot air device 9 includes a row of hot air windows 11, two parallel crossbars 12 for supporting the row of hot air windows 11, a screw assembly 13 for pushing the row of hot air windows 11, a long conductor assembly 14 for supplying power to the row of hot air windows 11, and a long shaft gear 15 for driving the row of hot air windows 11. One end of the crossbar 12 is bent and fixed to the flat plate component 7.

[0035] Reference Appendix Figure 8 and attached Figure 9 Understanding: The hot air window 11 includes a bridge plate frame 21 that slides under the guidance of two crossbars 12, an electric heating wire 16 fixed below the bridge plate frame 21, conductive spring pieces 17 fixedly connected to both ends of the electric heating wire 16, a triangular grille 18 set on the leeward side of the electric heating wire 16, a bolt 19 mounted on the bridge plate frame 21, and a spring 20 that contacts both ends of the bridge plate frame 21. The spring 20 is sleeved on the crossbars 12. The two conductive spring pieces 17 simultaneously contact the long conductor assembly 14 to energize the electric heating wire 16. The bolt 19 de-energizes the electric heating wire 16 by pressing one of the conductive spring pieces 17. The long shaft gear 15 drives the triangular grille 18 to swing to prevent heat accumulation at the contact point between the triangular grille 18 and the electric heating wire 16. The crossbars 12 slide through the through holes at the ends of the bridge plate frame 21. The ends of the electric heating wire 16 are fixed by a protrusion in the middle of the bridge plate frame 21, thus the electric heating wire... The heating wire 16 is suspended below the bridge plate frame 21. The heating wire 16 itself has a certain degree of hardness. However, the heating wire 16 may deform due to prolonged heating and the impact of flowing inert gas. Therefore, the present invention provides a supporting triangular grid 18 on the leeward side of the heating wire 16 to resist the deformation of the heating wire 16 under prolonged airflow. The conductive spring 17 can also be fixed on the protrusion of the bridge plate frame 21. The spacing of a row of heating wires 16 in the present invention can be adjusted to change the temperature rise gradient. After the spacing is set, the overall length is set by changing the number of heating wires 16 participating in heating. This length corresponds to the length of the weld pool. Because the length of the weld pool is different under different welding conditions, because there is a weld pool not only at the laser irradiation point, but also after the laser advances, a weld pool that gradually cools and hardens is left behind. Therefore, the weld pool itself has a certain length. The entire length of the molten pool requires inert gas coverage to isolate it from the outside air. However, the blowing of inert gas accelerates the cooling of the molten pool, leading to internal stress problems. Therefore, this invention uses a row of heating wires 16 to heat the circulating inert gas. The inert gas itself has a temperature, which can slow down the cooling of the molten pool. Furthermore, the temperature varies throughout the molten pool; the closer to the laser point, the higher the temperature. Therefore, the covering inert gas itself needs to be at a high temperature to effectively counteract and slow down the cooling of the high-temperature molten pool. Conversely, the molten pool further away from the laser point gradually cools down, resulting in a strong weld connection, and thus no high-temperature inert gas is needed to slow down the cooling. Therefore, this invention uses inert gas to cover a molten pool with varying temperatures throughout. The inert gas itself also needs to have a temperature change. The closer the inert gas is to the laser irradiation point, the higher the temperature of the inert gas. This invention achieves this by heating the inert gas with a row of heating wires 16. The inert gas is ejected from the gas supply device 10. The more heating wires 16 it passes through, the higher the temperature of the inert gas. This corresponds to the gradually increasing temperature of the molten pool below. After the inert gas passes through all the heating wires 16, the temperature reaches its maximum. The hot inert gas then covers the molten pool at the laser irradiation point to slow down the cooling of the molten pool. The molten pool under different conditions has a corresponding cooling gradient. This cooling gradient corresponds to the distribution density of the row of heating wires 16. That is, the greater the density of the row of heating wires 16, the faster the inert gas heats up above the molten pool of a fixed length.

[0036] Reference Appendix Figure 12 The gas supply device 10 includes an L-shaped pipe 25 with one end passing through the tail triangular plate 8, a windmill 22 disposed in the L-shaped pipe 25 and blown by the supplied inert gas, a windmill shaft 23 fixed in the middle of the windmill 22, and a swing wheel 24 that is driven by the end of the windmill shaft 23 that extends to the outside of the L-shaped pipe 25. One end of the long shaft gear 15 passes through the tail triangular plate 8 and establishes a transmission with the swing wheel 24. The long shaft gear 15 is provided with a shaft body, and the shaft body is movably sleeved in the through hole opened on the tail triangular plate 8. The other end of the L-shaped pipe 25 is externally connected to the inert gas supply mechanism in the prior art, so that the supplied inert gas is transported to the triangular channel through the L-shaped pipe 25.

[0037] Reference Appendix Figure 13 The balance wheel assembly 24 includes an outer frame 36 fixed to an L-shaped pipe 25, a worm gear 37 and a disc shaft 38 simultaneously supported on the outer frame 36, a speed-reducing gear 35 fixed at one end of the worm gear 37, a turntable 39 fixed at one end of the disc shaft 38, a swing plate 40 hinged to the turntable 39 at one end, and a double control frame 41 hinged to the other end of the swing plate 40. The double control frame 41 is equipped with a rack for transmission with a long shaft gear 15. The double control frame 41 is also equipped with a square column for sliding through a square hole opened on the outer frame 36. The speed-reducing gear 35 is connected to a gear transmission fixed at the end of the wind turbine shaft 23, and the other end of the worm gear 37 is connected to a ring worm gear transmission fixed on the turntable 39.

[0038] When inert gas is transported in the L-shaped pipe 25, the inert gas also impacts the impeller 22. The impeller 22 rotates to drive the impeller shaft 23, which in turn drives the worm gear 37 to rotate through the speed reduction gear 35. The worm gear 37 and the disc shaft 38 are respectively movably sleeved in two through holes opened on the outer frame 36. The worm gear 37 drives the turntable 39, and the turntable 39 rotates to push and pull the swing plate 40, thereby causing the double control frame 41 to rise and fall continuously, and then drive the long shaft gear 15 to rotate back and forth.

[0039] Reference Appendix Figure 5 Understandably, the flat panel component 7 includes a main flat panel 702 fixed on the suspension 6, a door panel 701 sealing the elongated hole on the main flat panel 702, and a door bolt 703 provided on the main flat panel 702. The door panel 701 and the main flat panel 702 are hinged together.

[0040] The long conductive assembly 14 includes an insulating crossbar 31 with one end fixed to the main plate 702, two long conductive plates 30 fixed on the insulating crossbar 31, and wires 29 connected to the long conductive plates 30. The conductive spring 17 contacts the long conductive plates 30 to conduct electricity. (Refer to the attached diagram.) Figure 7 Two wires 29 are connected to a power source in the prior art. When the two conductive springs 17 at both ends of the heating wire 16 are in contact with the two long conductive plates 30 respectively, the heating wire 16 is energized and heats up. The bolt 19 presses one of the conductive springs 17, thereby separating the conductive spring 17 from the long conductive plate 30, breaking the circuit, and the heating wire 16 will not heat up.

[0041] The bolt fixture 19 includes a pivot pin 42 movably fitted into a through hole in the bridge plate frame 21, a threaded pin 43 with one end of the pivot pin 42 for transmission, a pressure plate 44 screwed to the threaded pin 43, a rail body 45 guiding the directional sliding of the pressure plate 44, and a tailstock 46 fixed on the rail body 45. The tailstock 46 supports the threaded pin 43, and the rail body 45 is fixed on the bridge plate frame 21. The tip of one end of the pressure plate 44 presses the conductive spring 17 to separate the conductive spring 17 from the long conductive piece 30. The end of the threaded pin 43 is movably fitted into the through hole in the tailstock 46, and a T-shaped pin is provided on the pressure plate 44 to engage with the T-shaped pin in the rail body 45. In the slide, the heating wire 16 can be preset to be used. For example, if the last few heating wires 16 in a row of heating wires 16 need not to heat up, the adjustment column 42 can be rotated in advance using a tool. Specifically, the door panel 701 is opened to expose the adjustment column 42. Then the adjustment column 42 is rotated. The bevel gear fixed at the end of the adjustment column 42 and the bevel gear fixed at the end of the threaded column 43 change direction transmission. The rotation of the threaded column 43 drives the pressure plate 44 to move horizontally. The pressure plate 44 presses the conductive spring 17. The conductive spring 17 and the long conductive piece 30 separate, so the corresponding heating wire 16 below will not be energized and heat up. After the adjustment is completed, the door panel 701 is closed.

[0042] The screw assembly 13 includes two lead screws 26 fixed to the ends of two crossbars 12, a reversing frame 28 sliding on the lead screws 26, and a nut 27 screwed onto the lead screws 26. One side of the reversing frame 28 is blocked by the nut 27, and the other side of the reversing frame 28 compresses the spring 20. Both ends of the reversing frame 28 have through holes, and the lead screws 26 pass through the through holes of the reversing frame 28. The closer the reversing frame 28 is to the welding gun 4, the smaller the spacing of the row of heating wires 16 will be, which will cause the inert gas passing through to heat up faster. The density of the row of heating wires 16 can be adjusted and set. After adjustment, the nut 27 is rotated so that the nut 27 is blocked on one side of the reversing frame 28.

[0043] The triangular grid 18 includes a T-shaped frame 32 that slides under the support of the bridge plate frame 21, a row of retaining plates 33 fixed on the T-shaped frame 32, and a row of guide plates 34 fixed on the back of the retaining plates 33. The front of the retaining plates 33 contacts the heating wire 16. A rack is fixed on the T-shaped frame 32 to drive the long shaft gear 15. The long shaft gear 15 drives the T-shaped frame 32 to swing laterally through continuous reciprocating rotation, thereby contacting the row of retaining plates 33 with the heating wire 16. The reciprocating sliding action of the retaining plate 33 supports the heating wire 16 from behind to prevent the inert gas from bending the heating wire 16. If the retaining plate 33 does not move, the heating wire 16 will be heated for a long time, which will cause heat accumulation at the contact point between the two, thereby accelerating the damage of the heating wire 16. The retaining plate 33 moves to prevent the heating wire 16 from overheating locally. The inert gas is heated when it passes through the heating wire 16, and the heated inert gas is deflected under the guidance of the guide plate 34 and then impacts the molten pool below.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laser seamless welding device for processing smoke exhaust valves, characterized in that: The system includes a square valve frame composed of four frame plates, a windproof extension frame connected to one end of the square valve frame, a clamping mechanism for positioning and holding the four frame plates, a welding torch that emits a laser to the weld seam between two adjacent frame plates, an inert gas regulator located on one side of the torch nozzle, and a suspension for simultaneously supporting the welding torch and the inert gas regulator. The windproof extension frame is fixed to the clamping mechanism to rotate synchronously with the square valve frame. The inert gas regulator is located at the angle between the two frame plates, forming a triangular channel for inert gas flow between the inert gas regulator and the two frame plates to guide the inert gas to cover the weld pool. The inert gas regulator includes: A flat plate component fixed to the suspension, and a tail triangular plate vertically connected to one end of the flat plate component; the nozzle of the welding gun is located at the other end of the flat plate component. A hot air device is located below the flat plate component, the hot air device being used to heat the inert gas flowing in the triangular channel; An air supply device for injecting inert gas into a triangular channel is mounted on a tail triangular plate and is connected to a hot air device via a transmission mechanism.

2. The laser seamless welding device for processing smoke exhaust valves according to claim 1, characterized in that: The hot air device includes a row of hot air windows, two parallel crossbars for supporting the row of hot air windows, a screw assembly for pushing the row of hot air windows, a long conductor assembly for supplying power to the row of hot air windows, and a long shaft gear for driving the row of hot air windows. One end of the crossbar is bent and fixed to the flat plate component.

3. The laser seamless welding device for processing smoke exhaust valves according to claim 2, characterized in that: The hot air window includes a bridge plate frame that slides under the guidance of two crossbars, an electric heating wire fixed below the bridge plate frame, conductive springs fixedly connected to both ends of the electric heating wire, a triangular grille set on the leeward side of the electric heating wire, a bolt installed on the bridge plate frame, and a spring that contacts both ends of the bridge plate frame. The spring is sleeved on the crossbars. The two conductive springs simultaneously contact the long conductor assembly to energize the electric heating wire. The bolt cuts off the power to the electric heating wire by pressing one of the conductive springs. The long shaft gear drives the triangular grille to swing to avoid heat accumulation at the contact point between the triangular grille and the electric heating wire.

4. The laser seamless welding device for processing smoke exhaust valves according to claim 2, characterized in that: The air supply device includes an L-shaped pipe with one end passing through a tail triangle plate, a windmill installed in the L-shaped pipe and blown by inert gas, a windmill shaft fixed in the middle of the windmill, and a swing wheel that is driven by the end of the windmill shaft that extends to the outside of the L-shaped pipe. One end of the long shaft gear passes through the tail triangle plate and establishes a transmission with the swing wheel.

5. The laser seamless welding device for processing smoke exhaust valves according to claim 4, characterized in that: The swing wheel assembly includes an outer frame fixed to an L-shaped pipe, a worm gear and a disc shaft simultaneously supported on the outer frame, a speed-reducing gear fixed to one end of the worm gear, a turntable fixed to one end of the disc shaft, a swing plate hinged to the turntable at one end, and a double control frame hinged to the other end of the swing plate. The double control frame is equipped with a rack for transmission with a long shaft gear, and a square column is also provided on the double control frame to slide through a square hole opened in the outer frame. The speed-reducing gear is transmitted through a gear fixed to the end of the wind turbine shaft, and the other end of the worm gear is transmitted through an annular worm gear fixed to the turntable.

6. The laser seamless welding device for processing smoke exhaust valves according to claim 3, characterized in that: The flat panel component includes a main flat panel fixed to the suspension, a door panel sealing the elongated hole on the main flat panel, and a door bolt installed on the main flat panel. The door panel and the main flat panel are hinged together.

7. The laser seamless welding device for processing smoke exhaust valves according to claim 6, characterized in that: The long conductor assembly includes an insulating crossbar fixed at one end to the main plate, two long conductive plates fixed on the insulating crossbar, and wires connected to the long conductive plates. The conductive spring contacts the long conductive plates and conducts electricity.

8. The laser seamless welding device for processing smoke exhaust valves according to claim 7, characterized in that: The bolt includes a pivot pin that is movably sleeved in a through hole in the bridge plate frame, a threaded pin that drives one end of the pivot pin, a pressure plate that is screwed to the threaded pin, a rail body that guides the pressure plate to slide in a specific direction, and a tail seat that is fixed on the rail body. The tail seat supports the threaded pin, the rail body is fixed on the bridge plate frame, and the tip of the pressure plate at one end separates the conductive spring and the long conductive sheet by pressing the conductive spring.

9. The laser seamless welding device for processing smoke exhaust valves according to claim 3, characterized in that: The screw assembly includes two lead screws fixed to the ends of two crossbars, a reversing bracket sliding on the lead screws, and a nut screwed onto the lead screws. One side of the reversing bracket is blocked by the nut, and the other side of the reversing bracket is compressed by a spring.

10. The laser seamless welding device for processing smoke exhaust valves according to claim 3, characterized in that: The triangular grid includes a T-shaped frame that slides under the support of the bridge plate frame, a row of retaining plates fixed on the T-shaped frame, and a row of guide plates fixed on the back of the retaining plates. The front of the retaining plates is in contact with the heating wire, and a rack is fixed on the T-shaped frame to drive the long shaft gear.

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