Laser welding device for boiler flue gas pipeline

Abstract

The invention discloses a laser welding device for a boiler flue gas pipeline, and belongs to the technical field of flue gas pipeline production, the laser welding device comprises a bottom frame and a multi-axis laser welding machine body arranged on one side of the bottom frame, and the upper end of the bottom frame is fixedly provided with a bearing assembly used for bearing a to-be-welded pipeline; two bearing frames used for bearing the end plates are symmetrically arranged at the upper end of the bottom frame in a sliding mode, a two-way lead screw used for driving the bearing frames to slide is rotationally arranged on the inner side of the bottom frame, a second motor used for driving the two-way lead screw to rotate is arranged on the outer side of the bottom frame, and the two bearing frames are in threaded fit with the two-way lead screw through moving bases. The storage box and related assemblies greatly facilitate storage and feeding of the end plates, the height of a bearing block of the bearing assembly is adjusted through an electric push rod, a to-be-welded pipeline and the end plates can be rapidly located on the same axis, an accurate butt joint foundation is provided for follow-up welding, welding deviation is reduced, and the welding quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas pipeline production, and particularly to a laser welding device for boiler flue gas pipelines. Background Art

[0002] In modern industrial production, boilers, as important energy conversion devices, are widely used in multiple fields such as electric power, chemical industry, and heating. During the operation of boilers, a large amount of high-temperature and high-pressure flue gas is generated, which needs to be transported and processed through special flue gas pipelines. The welding quality of the flue gas pipelines is directly related to the safety, stability, and operating efficiency of the entire boiler system.

[0003] In traditional boiler flue gas pipeline welding devices, a welding robot is provided on the welding table. Workers can place the workpieces to be welded in the welding working area of the welding table. However, the loading and unloading of the welded parts are completely manual. During the operation of welding end plates at the end of the pipeline, not only is it necessary to place the pipeline in the designated welding working area, but also it is necessary to manually align the end plate with the pipeline end plate, and the operation process is relatively cumbersome. Summary of the Invention

[0004] The purpose of the present invention is to provide a laser welding device for boiler flue gas pipelines to solve the above technical problems.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A laser welding device for boiler flue gas pipelines includes a chassis and a multi-axis laser welding machine body provided on one side of the chassis. A supporting component for supporting the pipeline to be welded is fixedly provided at the upper end of the chassis. Two supporting brackets for supporting end plates are symmetrically and slidably provided at the upper end of the chassis. A bidirectional lead screw for driving the supporting brackets to slide is rotatably provided inside the chassis. A second motor for driving the bidirectional lead screw to rotate is provided outside the chassis. The two supporting brackets are in threaded cooperation with the bidirectional lead screw through moving seats; It also includes a storage box for storing end plates: The storage box is fixedly connected to the chassis through a support plate. An input port is provided on one side of the storage box, and a protection component is provided at the input port. A pushing component is provided inside the storage box. A blanking port is opened at the lower end of the storage box, and a blanking component matching the blanking port is provided at the lower end of the storage box.

[0006] As a further description of the above technical solution: The supporting component includes a supporting block and a fixing plate fixedly provided inside the chassis. An electric push rod for driving the supporting block to lift is fixedly provided at the upper end of the fixing plate.

[0007] As a further description of the above technical solution: The pushing component includes a pushing frame slidably arranged inside the storage box and a threaded rod rotatably arranged inside the storage box for driving the movement of the pushing frame. A first motor for driving the rotation of the threaded rod is fixedly arranged outside the storage box.

[0008] As a further description of the above technical solution: The blanking component includes a cross bar and two vertical rods formed with sliding holes. The two vertical rods are fixedly connected to the cross bar. Two fixed blocks are symmetrically and fixedly arranged at the lower end of the storage box. A driven shaft is rotatably arranged on one side of the two fixed blocks. The two vertical rods are respectively slidably sleeved on the driven shaft. A guiding block is fixedly arranged on the inner wall of the sliding hole of the vertical rod. A guiding groove matched with the guiding block is formed on the outer surface of the two driven shafts. A constraint plate for receiving the lower end plate of the blanking port is fixedly sleeved on the outer side of one end of the two driven shafts. A threaded seat is fixedly arranged at the lower end of the cross bar. Threaded sections matched with the threaded seat are arranged at both ends of the outer surface of the bidirectional lead screw.

[0009] As a further description of the above technical solution: The protection component includes a protection door matched with the input port and a lifting plate slidably arranged up and down inside the storage box. The protection door is hinged with the lifting plate through a reset hinge. A strip-shaped groove is formed inside the lifting plate. Two transmission shafts are symmetrically and rotatably arranged inside the storage box. An eccentric wheel is fixedly sleeved on the outer side of one end of the two transmission shafts. A convex block matched with the strip-shaped groove is fixedly arranged on one side of the eccentric wheel. The other ends of the two transmission shafts penetrate outside the storage box and are fixedly sleeved with a first sprocket. A second sprocket is fixedly sleeved on the outer side of the other end of the two driven shafts. The first sprocket and the second sprocket are connected by a chain drive.

[0010] As a further description of the above technical solution: The supporting bracket includes a square tube and a connecting plate. The connecting plate and the square tube are connected to each other by a spring. The moving seat is fixedly connected to the connecting plate. Two supporting seats for supporting the end plate are symmetrically and fixedly arranged at the upper end of the square tube. Two guiding rods are fixedly arranged on one side of the connecting plate. One ends of the two guiding rods movably penetrate through the square tube and are provided with pressing blocks for pressing the vertical rod. The pressing blocks are made of elastic materials.

[0011] As a further description of the above technical solution: A slide rail is fixedly arranged at the upper end of the chassis. A slide seat matched with the slide rail is fixedly arranged at the lower end of the square tube. Bolts for restricting the sliding of the slide seat are fixedly arranged at both ends of the slide rail.

[0012] As a further description of the above technical solution: A mounting shell is fixedly provided at the upper end of the cross bar. A winding roller is rotatably provided inside the mounting shell. A clockwork spring is provided at the rotational connection between the winding roller and the mounting shell. The spring constant of the spring is greater than that of the clockwork spring, and the spring constant of the clockwork spring is greater than that of the reset hinge. A pull rope is wound around the surface of the winding roller. One end of the pull rope movably passes out of the mounting shell and is fixedly connected to the square tube. An electromagnet for magnetically fixing to the chassis is provided on one side of the threaded seat. A contact switch for de-energizing the electromagnet is fixedly provided outside the mounting shell. An insulating block for separating the contact switch is fixedly provided on the outer surface of the pull rope.

[0013] As a further description of the above technical solution: A bearing seat matching with the bidirectional lead screw is fixedly provided at the upper end of the fixing plate. A protective cover for covering the first sprocket, the second sprocket, the first motor and the chain is provided outside the storage box.

[0014] As a further description of the above technical solution: The guiding groove is composed of a horizontal groove and a spiral groove.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: In the present invention, the storage box and related components greatly facilitate the storage and feeding of the end plates. In the pushing component, the first motor drives the threaded rod to rotate, driving the pushing frame to accurately push the end plates, moving a distance equal to the thickness of one end plate each time, ensuring the accuracy and continuity of the feeding. In the protection component, the protection door and the lifting plate work together. The protection door prevents the end plates from falling down under normal conditions. When the lifting plate moves downward under the action of the eccentric wheel and the convex block, the protection door opens, and at the same time the lifting plate blocks the remaining end plates, effectively avoiding the chaotic falling of the end plates in the storage box and ensuring the safety and order of the storage and feeding process of the end plates.

[0016] In the present invention, the supporting component adjusts the height of the supporting block through the electric push rod, which can quickly align the pipeline to be welded with the end plate on the same axis, providing an accurate docking basis for subsequent welding, reducing welding deviation and improving welding quality. Driven by the second motor, the bidirectional lead screw drives the supporting frame to move precisely, enabling the end plate to accurately approach the pipeline to be welded. And during the movement, through the cooperation of the supporting frame and the feeding component, the end plate is stably placed at both ends of the pipeline, with high positioning accuracy, ensuring the accuracy of the welding position. Description of the Drawings

[0017] Figure 1 Shows the external view of the welding device provided according to an embodiment of the present invention; Figure 2 Shows the structural schematic diagram of the supporting component provided according to an embodiment of the present invention; Figure 3Shows a schematic structural diagram of a storage box and a supporting member provided according to an embodiment of the present invention; Figure 4 Shows a Figure 3 Schematic structural diagram after hiding the support plate and the protective cover; Figure 5 Shows a schematic structural diagram of a pushing component provided according to an embodiment of the present invention; Figure 6 Shows a partial schematic structural diagram of a supporting bracket and a blanking component provided according to an embodiment of the present invention; Figure 7 Shows a partial schematic structural diagram of a blanking component provided according to an embodiment of the present invention; Figure 8 Shows a sectional view of the structure of an installation shell provided according to an embodiment of the present invention; Figure 9 Shows an exploded schematic diagram of the structure of a protective component and a transmission shaft provided according to an embodiment of the present invention; Figure 10 Shows a sectional view of the structure of a vertical rod provided according to an embodiment of the present invention; Figure 11 Shows a partial schematic structural diagram of a driven shaft provided according to an embodiment of the present invention; Figure 12 Shows a schematic structural diagram of a chassis provided according to an embodiment of the present invention.

[0018] Legend: 1. Chassis; 2. Multi-axis laser welding machine body; 3. Supporting block; 4. Storage box; 5. Protective cover; 6. Fixed plate; 7. Bearing seat; 8. Electric push rod; 9. Protective door; 10. Square tube; 11. Connecting plate; 12. Moving seat; 13. Sliding seat; 14. Vertical rod; 15. Installation shell; 16. Driven shaft; 17. First motor; 18. Chain; 19. Threaded rod; 20. Pushing frame; 21. Lifting plate; 22. Strip-shaped groove; 23. Fixed block; 24. Constraint plate; 25. Threaded seat; 26. Electromagnet; 27. Pulling rope; 28. Cross bar; 29. Contact switch; 30. Winding roller; 31. Insulating block; 32. Eccentric wheel; 33. Convex block; 34. Reset hinge; 35. Bi-directional lead screw; 36. Threaded section; 37. Slide rail; 38. Bolt; 39. Guide block; 40. Guide groove; 41. Spring; 42. Guide rod; 43. Extrusion block; 44. Supporting seat; 45. Second motor; 46. Transmission shaft. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0020] As Figures 1 - 12 shown, a laser welding device for a boiler flue gas pipeline includes a chassis 1 and a multi-axis laser welding machine body 2 provided on one side of the chassis 1. When welding the boiler flue gas pipeline, end plates need to be welded at both ends of the pipeline to be welded. Under the action of the multi-axis laser welding machine body 2, the end plates are welded and fixed to the pipeline. A supporting component for supporting the pipeline to be welded is fixedly provided at the upper end of the chassis 1. Two supporting brackets for supporting the end plates are symmetrically slidably provided at the upper end of the chassis 1. The supporting brackets are used to store the end plates to be welded. A bidirectional lead screw 35 for driving the supporting brackets to slide is rotatably provided inside the chassis 1. A second motor 45 for driving the bidirectional lead screw 35 to rotate is provided outside the chassis 1. The two supporting brackets are in threaded cooperation with the bidirectional lead screw 35 through a moving seat 12. Under the driving action of the second motor 45, the second motor 45 drives the bidirectional lead screw 35 to rotate forward. The forward rotation of the bidirectional lead screw 35 drives the supporting brackets to move through the moving seat 12, and then drives the end plates on the supporting brackets to approach the pipeline to be welded on the supporting component respectively, making preparations for subsequent welding. It further includes a storage box 4 for storing end plates: The storage box 4 is fixedly connected to the chassis 1 through a support plate. A feeding port is provided on one side of the storage box 4 and a protection component is provided at the feeding port. The protection component can be opened to make the feeding port in an unfolded state, facilitating the staff to store the end plates inside the storage box 4 for subsequent use. A pushing component is provided inside the storage box 4. Under the action of the pushing component, the pushing component pushes the end plate to move a specified distance each time it works (refer to the attached drawings of the specification Figure 5 , that is, each time it pushes a distance equal to the thickness of one end plate). A blanking port is opened at the lower end of the storage box 4 and a blanking component matching the blanking port is provided at the lower end of the storage box 4. Under the action of the pushing component, the end plate will fall from the blanking port and be supported by the blanking component. Subsequently, the end plate can fall from the blanking component onto the supporting bracket.

[0021] Furthermore, the supporting component includes a supporting block 3 and a fixing plate 6 fixedly provided inside the chassis 1. An electric push rod 8 for driving the supporting block 3 to lift is fixedly provided at the upper end of the fixing plate 6. During actual use, the customer places the pipeline to be welded on the supporting block 3 (refer to the attached drawings of the specification Figure 1 ), and starts the electric push rod 8 to adjust the height of the supporting block 3, so that the pipeline to be welded placed on the supporting block 3 and the end plates on the supporting brackets are on the same axis, making preparations for subsequent docking of the end plates with the pipeline to be welded.

[0022] Furthermore, the pushing component includes a pushing frame 20 slidably disposed inside the storage box 4 and a threaded rod 19 rotatably disposed inside the storage box 4 for driving the movement of the pushing frame 20. The pushing frame 20 is in threaded connection with the threaded rod 19. A first motor 17 for driving the rotation of the threaded rod 19 is fixedly provided outside the storage box 4. When the first motor 17 is started, it will drive the rotation of the threaded rod 19, and the rotation of the threaded rod 19 drives the movement of the pushing frame 20, achieving the effect of pushing the end plates stored inside the storage box 4.

[0023] Furthermore, the blanking component includes a cross bar 28 and two vertical rods 14 formed with sliding holes. The two vertical rods 14 are fixedly connected to the cross bar 28. Two fixing blocks 23 are symmetrically and fixedly provided at the lower end of the storage box 4. A driven shaft 16 is rotatably provided on one side of the two fixing blocks 23. The two vertical rods 14 are respectively slidably sleeved on the driven shaft 16. A guide block 39 is fixedly provided on the inner wall of the sliding hole of the vertical rod 14. Guide grooves 40 are formed on the outer surfaces of the two driven shafts 16 and are matched with the guide block 39. A constraint plate 24 for receiving the end plates falling from the blanking port is fixedly sleeved on the outer sides of one ends of the two driven shafts 16, so that the end plates discharged from the blanking port are initially lapped on the constraint plate 24 and will not fall downward. A threaded seat 25 is fixedly provided at the lower end of the cross bar 28. Threaded segments 36 matched with the threaded seat 25 are provided at both ends of the outer surface of the bidirectional lead screw 35.

[0024] Furthermore, the protection component includes a protection door 9 matched with the input port and a lifting plate 21 slidably disposed up and down inside the storage box 4. The protection door 9 is hinged to the lifting plate 21 through a return hinge 34 (refer to the attached instruction manual Figure 3 、the attached instruction manual Figure 5 、the attached instruction manual Figure 9), when the protective door 9 is closed, it is effectively prevented that the end plate falls down during the pushing process of the pushing component. When the lifting plate 21 is forced to move downward, the upper end surface of the protective door 9 will be separated from the inner wall of the input port. During this process, the protective door 9 will flip open under the action of the reset hinge 34. At the same time, the lifting plate 21 moves downward and will block the outer side of the end plate that is not aligned with the discharge port, effectively preventing the remaining end plates in the storage box 4 from falling down. A strip groove 22 is provided on the inner side of the lifting plate 21, and two transmission shafts 46 are symmetrically rotated inside the storage box 4. An eccentric wheel 32 is fixedly sleeved on the outer side of one end of the two transmission shafts 46, and a protrusion 33 matching the strip groove 22 is fixedly provided on one side of the eccentric wheel 32. The two transmission shafts The other end of 46 passes through the outside of the storage box 4 and is fixedly sleeved with a first sprocket. The other ends of the two driven shafts 16 are fixedly sleeved with a second sprocket. The first sprocket and the second sprocket are connected through a chain 18. Under the transmission action of the first sprocket, the second sprocket and the chain 18, the transmission shaft 46 will be driven to rotate, and the rotation of the transmission shaft 46 drives the eccentric wheel 32 to rotate. During the rotation of the eccentric wheel 32, the lifting plate 21 is driven to move downward with the cooperation of the protrusion 33 and the strip groove 22. Conversely, when the transmission shaft 46 rotates in the opposite direction, it will drive the lifting plate 21 to move upward, and the lifting plate 21 will drive the protective door 9 to move upward, and the side wall of the protective door 9 is squeezed and contacted with the inner wall of the input port, so that the protective door 9 is flipped and closed.

[0025] Further, the supporting bracket includes a square tube 10 and a connecting plate 11. The connecting plate 11 and the square tube 10 are interconnected by a spring 41. The moving seat 12 is fixedly connected to the connecting plate 11. Two supporting seats 44 for supporting the end plate are symmetrically and fixedly provided at the upper end of the square tube 10. The supporting seat 44 is composed of a column, a mounting seat and a grooved wheel. The grooved wheel is rotatably connected to the mounting seat, and the mounting seat is fixedly connected to the column, so that the end plate can be stuck in the groove of the grooved wheel. Two guide rods 42 are fixedly provided on one side of the connecting plate 11. One end of the two guide rods 42 movably penetrates through the square tube 10 and is provided with a pressing block 43 for pressing the vertical rod 14. The pressing block 43 is made of an elastic material. A slide rail 37 is fixedly provided at the upper end of the chassis 1. A slide seat 13 matched with the slide rail 37 is fixedly provided at the lower end of the square tube 10. Bolts 38 for restricting the sliding of the slide seat 13 are fixedly provided at both ends of the slide rail 37. During use, when the bidirectional lead screw 35 rotates to drive the connecting plate 11 to move towards the storage box 4, since the square tube 10 and the connecting plate 11 are connected by the spring 41, the connecting plate 11 will drive the square tube 10 to move synchronously when it moves, that is, drive the supporting seat 44 to move, so that the supporting seat 44 moves downward below the material outlet. When the slide seat 13 abuts against the bolt 38, the movement of the slide seat 13 is restricted at this time, that is, the movement of the supporting seat 44 is restricted. At this time, the supporting seat 44 is just located directly below the material outlet, preparing to support the end plate falling from the material outlet. After the movement of the slide seat 13 is restricted, when the bidirectional lead screw 35 continues to rotate to drive the connecting plate 11 to move, the spring 41 will be gradually compressed, causing a relative displacement between the guide rod 42 and the square tube 10, that is, driving the pressing block 43 to move. As the pressing block 43 moves, the pressing block 43 will press the vertical rod 14, and then the vertical rod 14 moves relative to the driven shaft 16. During this process, the threaded seat 25 will be gradually screwed onto the threaded section 36, causing the guide block 39 to slide in the guide groove 40, causing the driven shaft 16 to rotate. The rotation of the driven shaft 16 drives the constraint plate 24 to deflect, that is, the constraint plate 24 flips downward. During the process of the constraint plate 24 flipping downward, the end plate gradually moves downward under the action of gravity until the end plate falls on the supporting seat 44. At the same time, the rotation of the driven shaft 16 will drive the transmission shaft 46 to rotate through the first sprocket, the second sprocket and the chain 18, that is, the protective door 9 is unfolded, preparing for the subsequent movement of the supporting seat 44 to drive the end plate.

[0026] Further, an installation shell 15 is fixedly provided at the upper end of the cross bar 28. A winding roller 30 is rotatably arranged inside the installation shell 15. A clockwork spring is arranged at the rotational connection of the winding roller 30 and the installation shell 15. The spring constant of the spring 41 is greater than that of the clockwork spring, and the spring constant of the clockwork spring is greater than that of the reset hinge 34. A pull rope 27 is wound around the surface of the winding roller 30. One end of the pull rope 27 movably passes through the outside of the installation shell 15 and is fixedly connected to the square pipe 10. An electromagnet 26 for magnetically fixing to the chassis 1 is arranged on one side of the threaded seat 25. A contact switch 29 for powering off the electromagnet 26 is fixedly arranged on the outside of the installation shell 15. An insulating block 31 for separating the contact switch 29 is fixedly arranged on the outer surface of the pull rope 27. When the vertical rod 14 is squeezed by the squeeze block 43 and moves, it will drive the cross bar 28 and the threaded seat 25 to move synchronously, so that the threaded seat 25 is threadedly connected to the threaded section 36, thereby enabling the threaded seat 25 to move stably, and will also cause the threaded seat 25 to disengage from the threaded section 36 again, thereby enabling the electromagnet 26 outside the threaded seat 25 to be magnetically fixed to the chassis 1. Then when the bidirectional lead screw 35 rotates in the reverse direction, it drives the two connecting plates 11 to approach each other. At this time, due to the magnetic attraction of the electromagnet 26, the reverse movement of the connecting plate 11 will not cause the threaded seat 25 to move. During this process, the protective door 9 is in the unfolded state. The reverse movement of the connecting plate 11 drives the supporting seat 44 to move, that is, drives the end plate to approach the pipeline to be welded (refer to the attached Figure 1 and the attached Figure 5 ). After the supporting seat 44 drives the end plate to move to the outside of the unfolded protective door 9, due to the magnetic attraction fixation of the threaded seat 25, the movement of the connecting plate 11 will drive the square pipe 10 to move synchronously, and then pull the pull rope 27. When the pull rope 27 is pulled, it will cause the winding roller 30 to rotate and release, that is, drive the insulating block 31 to move. When the insulating block 31 squeezes the contact switch 29 to cut off the power of the electromagnet 26, the adsorption is released at this time, and then a force for the reverse movement of the threaded seat 25 will be given, thereby driving the threaded seat 25 to move in the reverse direction, that is, the threaded seat 25 can be restored to its original state.

[0027] Further, a bearing seat 7 that cooperates with the bidirectional lead screw 35 is fixedly provided at the upper end of the fixing plate 6, ensuring the rotational stability of the bidirectional lead screw 35. A protective cover 5 for covering the first sprocket, the second sprocket, the first motor 17, and the chain 18 is arranged outside the storage box 4, improving the overall aesthetics and ensuring safety during use.

[0028] Further, the guiding groove 40 is composed of a horizontal groove and a spiral groove. During the threaded engagement movement of the threaded seat 25 and the threaded section 36, the guiding block 39 slides along the spiral groove part of the guiding groove 40. When the threaded seat 25 is separated from the threaded section 36 and is pushed by the squeeze block 43, at this time, the guiding block 39 slides along the horizontal groove part of the guiding groove 40.

[0029] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A laser welding device for a boiler flue gas pipeline, comprising a base frame (1) and a multi-axis laser welding machine body (2) arranged on one side of the base frame (1), characterized in that: A supporting assembly for supporting the pipe to be welded is fixedly provided at the upper end of the base frame (1); two supporting brackets for supporting the end plate are symmetrically slidably provided at the upper end of the base frame (1); a bidirectional screw rod (35) for driving the supporting bracket to slide is rotatably provided on the inner side of the base frame (1); a second motor (45) for driving the bidirectional screw rod (35) to rotate is provided on the outer side of the base frame (1); the two supporting brackets are threadedly engaged with the bidirectional screw rod (35) via a moving seat (12); It also includes a storage box (4) for storing the end plates: the storage box (4) is fixedly connected to the base frame (1) via a support plate, a feed port is provided on one side of the storage box (4) and a protective component is provided at the feed port, a pushing component is provided inside the storage box (4), a material discharge port is provided at the lower end of the storage box (4) and a material discharge component matching the material discharge port is provided at the lower end of the storage box (4).

2. The laser welding device for boiler flue gas duct according to claim 1, characterized in that: The supporting assembly comprises a supporting block (3) and a fixing plate (6) fixedly arranged on the inner side of the base frame (1), and an electric push rod (8) for driving the supporting block (3) to move upward and downward is fixedly arranged on the upper end of the fixing plate (6).

3. The laser welding device for boiler flue gas duct according to claim 1, characterized in that: The pushing assembly comprises a pushing frame (20) slidably arranged inside the storage box (4) and a threaded rod (19) rotatably arranged inside the storage box (4) for driving the pushing frame (20) to move. A first motor (17) for driving the threaded rod (19) to rotate is fixedly arranged outside the storage box (4).

4. The laser welding device for boiler flue gas duct according to claim 1, characterized in that: The material discharge assembly comprises a cross bar (28) and two vertical bars (14) with sliding holes formed therein, the two vertical bars (14) being fixedly connected to the cross bar (28), two fixed blocks (23) being symmetrically fixedly provided at the lower end of the storage box (4), one side of the two fixed blocks (23) being rotatably provided with a driven shaft (16), the two vertical bars (14) being respectively slidably sleeved with the driven shaft (16), the inner wall of the sliding hole of the vertical bar (14) being fixedly provided with a guide block (39), the outer surface of the two driven shafts (16) being formed with a guide groove (40) matching with the guide block (39), one end of the two driven shafts (16) being fixedly sleeved with a restraining plate (24) for receiving an end plate falling from a material discharge port, the lower end of the cross bar (28) being fixedly provided with a threaded seat (25), and both ends of the outer surface of the bidirectional screw rod (35) being provided with a threaded section (36) matching with the threaded seat (25).

5. The laser welding device for boiler flue gas duct according to claim 4, characterized in that: The protection assembly comprises a protection door (9) matched with the input port and a lifting plate (21) slidable up and down inside the storage box (4), the protection door (9) being hingedly connected with the lifting plate (21) via a reset hinge (34), a strip groove (22) being provided on the inner side of the lifting plate (21), two transmission shafts (46) being symmetrically rotated inside the storage box (4), an eccentric wheel (32) being fixedly sleeved on the outer side at one end of the two transmission shafts (46), a protrusion (33) matching with the strip groove (22) being fixedly provided on one side of the eccentric wheel (32), the other ends of the two transmission shafts (46) passing through the outer side of the storage box (4) and being fixedly sleeved with a first sprocket, the other ends of the two driven shafts (16) being fixedly sleeved with a second sprocket, the first sprocket and the second sprocket being connected by a chain (18) for transmission.

6. The laser welding device for boiler flue gas duct according to claim 5, characterized in that: The support frame comprises a square tube (10) and a connecting plate (11), wherein the connecting plate (11) and the square tube (10) are connected to each other via a spring (41), the movable seat (12) is fixedly connected to the connecting plate (11), two supporting seats (44) for supporting end plates are symmetrically fixedly provided at the upper end of the square tube (10), two guide rods (42) are fixedly provided at one side of the connecting plate (11), one end of the two guide rods (42) movably passes through the square tube (10) and is provided with an extrusion block (43) for extruding the vertical rod (14), and the extrusion block (43) is made of elastic material.

7. The laser welding device for boiler flue gas duct according to claim 6, characterized in that: A slide rail (37) is fixedly provided at the upper end of the base frame (1), a slide seat (13) matching the slide rail (37) is fixedly provided at the lower end of the square tube (10), and bolts (38) for limiting the sliding of the slide seat (13) are fixedly provided at both ends of the slide rail (37).

8. The laser welding device for boiler flue gas duct according to claim 6, characterized in that: A mounting shell (15) is fixedly provided on the upper end of the crossbar (28), a winding roller (30) is rotatably provided inside the mounting shell (15), a spring is provided at the rotatable connection between the winding roller (30) and the mounting shell (15), the spring (41) has a stiffness coefficient greater than that of the spring, and the spring stiffness coefficient is greater than that of the reset hinge (34), a pull rope (27) is wound around the surface of the winding roller (30), one end of the pull rope (27) movably passes through the outside of the mounting shell (15) and is fixedly connected to the square tube (10), an electromagnet (26) for magnetically fixing to the bottom frame (1) is provided on one side of the threaded seat (25), a contact switch (29) for disconnecting the electromagnet (26) is fixedly provided on the outside of the mounting shell (15), and an insulating block (31) for separating the contact switch (29) is fixedly provided on the outer surface of the pull rope (27).

9. The laser welding device for boiler flue gas duct according to claim 5, characterized in that: A bearing seat (7) matched with the bidirectional screw rod (35) is fixedly provided at the upper end of the fixing plate (6), and a protective cover (5) for covering the first sprocket, the second sprocket, the first motor (17) and the chain (18) is provided on the outer side of the storage box (4).

10. The laser welding device for boiler flue gas duct according to claim 5, characterized in that: The guide groove (40) consists of a horizontal groove and a spiral groove.

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