A steel structure laser welding device based on multi-angle welding

Abstract

The application relates to the technical field of equal-material manufacturing equipment, and discloses a steel structure laser welding equipment based on multi-angle welding, which comprises a rack, a positioning operation mechanism arranged on the rack, a bracket arranged on the upper end of the rack, a ring-shaped welding base arranged on the upper end of the bracket, a multi-angle welding mechanism, and a blanking through hole corresponding to the positioning through hole and used for steel structure falling and arranged at one end of the rack and the bracket. The steel structure laser welding equipment based on multi-angle welding is provided with the positioning operation mechanism matched with the multi-angle welding mechanism, realizes physical separation of a welding station and a feeding and discharging station and function parallelism, enables laser welding, self-weight blanking and manual feeding and other operations to be synchronously performed, significantly improves equipment utilization and a production rhythm, and is particularly suitable for rapid and large-scale welding production of small-size steel structure parts.

Description

Technical Field

[0001] This invention relates to the field of material manufacturing equipment technology, and in particular to a laser welding equipment for steel structures based on multi-angle welding. Background Technology

[0002] In the field of construction and engineering, the connection of tubular or rod-shaped steel structural components such as steel pipes and poles relies heavily on welding technology. This type of welding not only requires high connection strength, but also requires full circumferential welding to ensure the sealing and load-bearing capacity of the structure. As a modern high-energy beam welding technology, laser welding has shown great potential in such applications due to its advantages such as high energy density, low heat input, small deformation and fast welding speed. It can achieve deep penetration welding and efficient precision machining, significantly improving the quality and appearance consistency of welds.

[0003] However, existing laser welding equipment for steel structure circumferential seams typically suffers from certain shortcomings in automation and continuity. The common practice is to place the workpiece horizontally, align and clamp it, and then weld it around its circumference using a welding torch. This process often requires repeated adjustments to the workpiece or welding torch angle, and the machine must be stopped for disassembly and re-fixing after each product is completed. For small-volume steel structures that need to be processed in batches, this single-station, non-continuous production mode leads to frequent auxiliary time occupation, causing the welding and loading / unloading processes to be disconnected from each other, which seriously restricts the improvement of overall processing efficiency and production cycle, making it difficult to meet the requirements of continuity and economy for large-scale production. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the existing equipment adopts a single-station, non-continuous production mode, which leads to the disconnect between welding and loading / unloading processes, requiring frequent machine stops for assembly and disassembly, which seriously restricts the efficiency of batch processing. To address this, we propose a steel structure laser welding equipment based on multi-angle welding.

[0005] To achieve the above objectives, this application adopts the following technical solution: a steel structure laser welding equipment based on multi-angle welding, including a frame, a positioning and operating mechanism on the frame, the positioning and operating mechanism including a bracket on the upper end of the frame, a ring-shaped welding base frame rotatably mounted on the upper end of the bracket, a positioning top plate that rotates synchronously with the welding base frame on the upper end of the welding base frame, corresponding positioning through holes evenly arranged around the positioning top plate and the welding base frame, the positioning through holes being adapted to the steel structure, and a first driving device for driving the welding base frame to rotate on the frame;

[0006] It also includes a multi-angle welding mechanism, which includes an annular adjustment frame rotatably disposed at one end between the positioning top plate and the welding base. Laser welding mechanisms are respectively provided at opposite ends of the annular adjustment frame. A notch for the steel structure to enter and exit is provided on one side of the annular adjustment frame. A second gear ring with a notch is provided on the outer side of the annular adjustment frame. Second gears that mesh with the second gear ring are respectively provided on both sides of the annular adjustment frame. A second drive device for driving the second gear to rotate is provided below the welding base.

[0007] One end of the frame and bracket is provided with a material dropping through hole that corresponds to the positioning through hole and is used for the steel structure to fall.

[0008] Preferably, the bottom of the welding base is provided with a support component for limiting the bottom of the steel structure. The support component includes a groove on the inner wall of the positioning through hole on the welding base. A limiting plate is movably provided on the inner side of the groove along the radial direction of the positioning through hole. An elastic element is provided between one end of the limiting plate and the inner wall of the groove. In the initial state of the elastic element, the limiting plate does not protrude from the inner wall of the positioning through hole. A pair of guide protrusions are provided on the top of the bracket. An annular groove is formed between the two guide protrusions. A traction rod extending to the annular groove is provided at the bottom of one end of the limiting plate. A narrow groove is provided at one end of the annular groove, and a wide groove with a width greater than the narrow groove is provided at the other end. A release notch is provided at the junction of the narrow groove and the wide groove at one end, located on the side wall of the guide protrusion and corresponding to the material drop through hole. The junction at the other end is smoothly transitioned by a slope.

[0009] Preferably, the narrow groove corresponds to the multi-angle welding mechanism, and when the lower end of the traction rod is located inside the narrow groove and the wide groove, one end of the limiting plate protrudes from the inner wall of the positioning through hole. When the lower end of the traction rod is located at the release recess, the limiting plate does not protrude from the inner wall of the positioning through hole.

[0010] Preferably, the welding base is provided with a lower positioning component, which includes a clamping arm disposed on the upper end of the limiting plate and moving synchronously with the limiting plate.

[0011] Preferably, the positioning top plate is provided with an upper positioning component, which includes an installation through hole disposed on the side wall of the positioning top plate and corresponding to the positioning through hole. A rotating rod is rotatably disposed inside the installation through hole. A locking block is movably disposed at one end of the installation through hole near the positioning through hole along the axial direction of the installation through hole, and one end of the locking block is threadedly engaged with the rotating rod.

[0012] Preferably, one end of the rotating rod extends to the outside of the positioning top plate and is provided with a third gear, and one end of the annular adjusting frame is provided with gear teeth that correspond to and are adapted to the third gear.

[0013] Preferably, the positioning top plate and the welding base are connected as one unit by a rotating component. The rotating component includes a rotating ring that is rotatably disposed on the opposite side wall of the positioning top plate and the welding base and located outside the positioning through hole. Support columns are installed at the opposite ends of the two corresponding rotating rings.

[0014] One end of the inner side of the annular adjustment frame is equipped with a lever corresponding to the support column. When the annular adjustment frame rotates, the lever can be used to drive the rotating ring and the support column to rotate as a whole.

[0015] Preferably, the bottom of the traction rod is provided with a roller for rotation.

[0016] Preferably, the first driving device includes a first gear ring disposed at the bottom of the welded base, a first gear meshing on one side of the first gear ring, and a first driving source for driving the first gear to rotate mounted on the frame.

[0017] Preferably, the top of the bracket and the frame are respectively provided with mounting brackets corresponding to the two sides of the annular adjustment bracket, and the annular adjustment bracket is rotatably set on the upper opposite sides of the two mounting brackets;

[0018] The second drive unit includes a vertical shaft rotatably mounted on two mounting brackets, a second gear mounted on the upper end of the vertical shaft, and the lower end of the vertical shaft extending to the bottom of the bracket and driven to rotate by a second drive source mounted on the frame.

[0019] The technical effects and advantages of this invention are as follows:

[0020] In this invention, the positioning and operation mechanism, in conjunction with the multi-angle welding mechanism, achieves physical separation and parallel operation of the welding station and the loading and unloading station. This allows operations such as laser welding, workpiece cooling, self-weight unloading, and manual loading to be performed simultaneously. This not only eliminates the inherent waiting and downtime of traditional single-station equipment and reduces auxiliary time to a low level, but also achieves automatic demolding and unloading through the workpiece's own weight, further simplifying the operation process and significantly improving equipment utilization and production cycle time. It is particularly suitable for the rapid and large-scale welding production of small-volume steel structure parts.

[0021] In this invention, the supporting components can support the steel structure, preventing friction damage between the bottom of the steel structure and the bracket, thus achieving stable support for the steel structure. When the steel structure aligns with the material drop hole, the limiting support can be automatically released to allow material to be dropped. The limiting and releasing actions are automatically implemented according to the operation of the welding base frame, making it convenient to use. Attached Figure Description

[0022] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the present invention from the bottom view;

[0025] Figure 3 This is a structural schematic diagram of the bracket of the present invention from the bottom view;

[0026] Figure 4 This is a structural schematic diagram of the bracket and welded base frame of the present invention in their disassembled state;

[0027] Figure 5 This is a structural schematic diagram of the annular adjustment frame, positioning top plate, and welding base frame of the present invention in a disassembled state;

[0028] Figure 6 This is a schematic diagram of the overall structure of the positioning top plate and welding base frame of the present invention;

[0029] Figure 7 This is a structural schematic diagram of the positioning top plate and the bottom of the welding base frame of the present invention.

[0030] Figure 8 This is a partial cross-sectional structural diagram of the positioning top plate and welding base frame of the present invention;

[0031] Figure 9 This is a top view of the bracket structure of the present invention.

[0032] Legend: 1. Frame; 2. Bracket; 3. Positioning top plate; 4. Welding base frame; 5. Mounting frame; 6. Material unloading through hole; 7. First drive source; 8. Second drive source; 9. First gear ring; 10. First gear; 11. Vertical shaft; 12. Annular adjusting frame; 13. Guide convex ring; 14. Second gear; 15. Second gear ring; 16. Laser welding mechanism; 17. Actuating rod; 18. Gear tooth; 19. Notch; 20. Rotating rod; 21. Positioning through hole; 22. Rotating ring; 23. Support column; 24. Roller; 25. Traction rod; 26. Mounting through hole; 27. Locking block; 28. Clamping arm; 29. ​​Limiting plate; 30. Slide groove; 31. Elastic element; 32. Narrow groove; 33. Wide groove; 34. Release notch; 35. Slope; 36. Third gear. Detailed Implementation

[0033] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0034] Reference Figures 1-8 As shown, a steel structure laser welding equipment based on multi-angle welding includes a frame 1, on which a positioning and operating mechanism is provided. In a preferred embodiment, the positioning and operating mechanism includes a bracket 2 fixedly installed on the upper end of the frame 1, with a gap between the bracket 2 and the frame 1. The bracket 2 has a central hole. A ring-shaped welding base 4 is rotatably mounted on the upper end of the bracket 2. The welding base 4 has a double-layer structure, with an annular cylinder installed in the middle of the bottom. This cylinder is rotatably mounted at the central hole of the bracket 2 via bearings. A positioning top plate 3 is provided on the upper end of the welding base 4, rotating synchronously with it. Corresponding positioning elements are evenly arranged around the positioning top plate 3 and the welding base 4. The positioning through hole 21 is adapted to the steel structure. The positioning through hole 21 on the positioning top plate 3 is adapted to the steel structure. The positioning through hole 21 on the welding base 4 is slightly larger than the diameter of the steel structure. In order to prevent the weld bead from appearing at the welding part and affecting the subsequent vertical material cutting, the frame 1 is provided with a first driving device for driving the welding base 4 to rotate. As a preferred embodiment, the first driving device includes a first gear ring 9 located on the outer side of the lower end of the annular cylinder at the bottom of the welding base 4. A first gear 10 is meshed on one side of the first gear ring 9. A first driving source 7 for driving the first gear 10 to rotate is installed at the bottom of the frame 1. The first driving source 7 is preferably a geared motor.

[0035] like Figures 1-5As shown, it also includes a multi-angle welding mechanism. In one embodiment, the multi-angle welding mechanism includes an annular adjustment frame 12 rotatably positioned between the positioning top plate 3 and the welding base frame 4. Laser welding mechanisms 16 are respectively installed at opposite ends of the annular adjustment frame 12. The laser welding mechanism 16 is a mature technology, its core consisting of a laser, a light guiding and focusing system, and a motion control system. The laser generates a high-energy beam, which is transmitted through optical fiber and focused into a micron-sized spot by a focusing lens group. This spot acts on the steel structure joint, instantly melting the metal through the keyhole effect to form a weld. The specific principles and structure are not elaborated upon here. One side of the annular adjustment frame 12 has a notch 19 for the steel structure to enter and exit. The outer side of the annular adjustment frame 12 has a second gear ring 15 with a notch. Second gears 14 meshing with the second gear ring 15 are respectively installed on both sides of the annular adjustment frame 12. Mounting brackets 5 corresponding to the two sides of the annular adjustment frame 12 are respectively installed on the top of the bracket 2 and the frame 1. The lower end of the mounting frame 5 extends downward to the frame 1 through the center hole of the welded base frame 4 and the bracket 2. The annular adjustment frame 12 is rotatably set on the upper opposite sides of the two mounting frames 5. To ensure stability, an annular guide rail can be set on the side wall of the annular adjustment frame 12, and the annular guide rail is movably guided to the mounting frame 5. A second drive device for driving the second gear 14 to rotate is set below the welded base frame 4. As an embodiment, the second drive device includes a vertical shaft 11 rotatably set on the two mounting frames 5. The second gear 14 is installed on the upper end of the vertical shaft 11. When one of the second gears 14 corresponds to the notch 19, the other second gear 14 can continue to drive the annular adjustment frame 12 to rotate. The lower end of the vertical shaft 11 extends to the bottom of the bracket 2 and is rotatably connected to the frame 1. A second drive source 8 is installed on the frame 1. The second drive source 8 is a geared motor, which is used to drive one of the vertical shafts 11 to rotate. The two vertical shafts 11 can be linked by a synchronous pulley, a synchronous belt or a sprocket chain.

[0036] like Figures 5-6 , Figure 8 As shown, in order to connect the positioning top plate 3 and the welding base 4, and to prevent motion interference caused by the annular adjustment frame 12 between the positioning top plate 3 and the welding base 4, the positioning top plate 3 and the welding base 4 are connected as one unit by a rotating component. The rotating component includes a rotating ring 22 rotatably disposed on the opposite side wall of the positioning top plate 3 and the welding base 4 and located outside the positioning through hole 21. Support columns 23 are installed at the opposite ends of the two corresponding rotating rings 22. In order not to affect the welding during welding, a lever 17 corresponding to the support column 23 is provided at one end of the inner side of the annular adjustment frame 12. When the annular adjustment frame 12 rotates, the lever 17 can be used to push the rotating ring 22 and the support column 23 to rotate as a whole. Moreover, the support column 23 is staggered from the laser welding mechanism 16.

[0037] As shown in the figure Figure 4As shown, in order to facilitate automatic unloading after welding, a unloading through hole 6 corresponding to the positioning through hole 21 and used for the steel structure to fall is provided at one end of the frame 1 and the bracket 2. When the steel structure reaches the middle of the annular adjustment frame 12, the welded steel structure can just correspond to the unloading through hole 6.

[0038] like Figures 7-9 As shown, in order to achieve stable support for the lower steel structure and prevent friction between the steel structure and the bracket 2, a support component for limiting the bottom of the steel structure is provided at the bottom of the welded base frame 4. In a preferred embodiment, the support component includes a groove 30 on the inner wall of the positioning through hole 21 on the welded base frame 4. A limiting plate 29 is movably arranged radially along the inner side of the groove 30 along the positioning through hole 21. The limiting plates 29 are arranged opposite to each other and can support and limit the bottom of the steel structure from both sides. An elastic element 31 is provided between one end of the limiting plate 29 and the inner wall of the groove 30. The elastic element 31 is preferably a spring, and in the initial state, the limiting plate 29 does not protrude from the inner wall of the positioning through hole 21. A pair of guide protrusions 13 are provided on the top of the bracket 2, and an annular groove is formed between the two guide protrusions 13. One end of the limiting plate 29 A traction rod 25 extending to an annular groove is provided at the bottom. A roller 24 is rotatably provided at the bottom of the traction rod 25. The roller 24 can reduce friction and replace the direct friction between the traction rod 25 and the side wall of the guide ring 13. A narrow groove 32 is provided at one end of the annular groove, and a wide groove 33 with a width greater than the narrow groove 32 is provided at the other end. A release notch 34 is provided at the junction of one end of the narrow groove 32 and the wide groove 33, located on the side wall of the guide ring 13 and corresponding to the material drop hole 6. The junction at the other end is smoothly transitioned by a slope 35. The narrow groove 32 corresponds to the multi-angle welding mechanism. When the lower end of the traction rod 25 is located inside the narrow groove 32 and the wide groove 33, one end of the limiting plate 29 protrudes from the inner wall of the positioning through hole 21. When the lower end of the traction rod 25 is located at the release notch 34, the limiting plate 29 does not protrude from the inner wall of the positioning through hole 21.

[0039] like Figure 8 As shown, in order to fix and stabilize the steel structure below, a lower positioning component is provided on the welding base frame 4. The lower positioning component includes a clamping arm 28 which is set on the upper end of the limiting support plate 29 and moves synchronously with the limiting support plate 29. The clamping arm 28 can clamp the steel structure below before welding, thereby increasing the stability of the steel structure below.

[0040] like Figure 6 , Figure 8As shown, in order to securely fix the upper steel structure, an upper positioning assembly is provided on the positioning top plate 3. The upper positioning assembly includes mounting through holes 26 located on the side wall of the positioning top plate 3 and corresponding one-to-one with the positioning through holes 21. A rotating rod 20 is rotatably mounted inside the mounting through hole 26. A locking block 27 is movably mounted along the axial direction of the mounting through hole 26 at one end of the mounting through hole 26 near the positioning through hole 21, and one end of the locking block 27 is threadedly engaged with the rotating rod 20. In order to facilitate manual or automatic rotation of the rod during material loading, 20. A knob or handwheel is provided at the end of the rotating rod 20 away from the locking block 27. In order to facilitate the automatic release of the fixation of the upper steel structure after welding, a third gear 36 is also provided at the end of the rotating rod 20 away from the locking block 27. A gear tooth 18 corresponding to and adapted to the third gear 36 is provided at one end of the annular adjustment frame 12. When the annular adjustment frame 12 is about to rotate 180 degrees, the gear tooth 18 can drive the third gear 36 and the rotating rod 20 to reverse in the same direction, thereby realizing the separation of the locking block 27 from the steel structure.

[0041] Working principle: During use, the first drive source 7 drives the welding base frame 4 to rotate through the cooperation of the first gear 10 and the first gear ring 9. The welding base frame 4 drives the positioning top plate 3 to rotate synchronously through multiple sets of support columns 23. When the roller 24 is located in the wide groove 33, one end of the limiting plate 29 protrudes from the inner wall of the positioning through hole 21 on the welding base frame 4. The steel structure is vertically inserted from the positioning through hole 21 on the positioning top plate 3, specifically from the area corresponding to the wide groove 33. The two steel structures to be welded are inserted in sequence. The bottom of the lower steel structure is supported by one end of the limiting plate 29. At this time, the gap between the clamping arms 28 is greater than the diameter of the steel structure. The upper steel structure is located in the positioning through hole 21 on the positioning top plate 3. The welding part of the two steel structures is just right. Between the positioning top plate 3 and the welding base 4, and corresponding to the laser welding mechanism 16 on the annular adjustment frame 12, if a gap needs to be left between the two steel structures, the upper steel structure is adjusted, and then the rotating rod 20 is turned, thereby displacing the locking block 27 to press against the upper steel structure. The purpose of the gap is to ensure complete penetration and fusion, which is suitable for steel structures with thicker walls. For thinner steel structures, no gap needs to be reserved, and the two steel structures can be made to contact directly. As the welding base 4 and the positioning top plate 3 rotate as a whole, the steel structure follows the displacement. Initially, the notch 19 on one side of the annular adjustment frame 12 faces the incoming material direction. When the steel structure enters the middle of the annular adjustment frame 12, it stops rotating. At this time, the roller 24 corresponding to the steel structure to be welded has already moved from the wide groove 33. Entering the narrow slot 32, the traction rod 25 further drives the limiting plate 29 to move, and at the same time drives the clamping arm 28 to clamp the steel structure below. Then, the laser welding mechanism 16 welds the welding part. At the same time, the second drive source 8 drives the two vertical shafts 11 to rotate. The vertical shafts 11 realize the rotation of the annular adjustment frame 12 through the cooperation of the second gear 14 and the second gear ring 15. The rotation angle is 180 degrees. The two laser welding mechanisms 16 realize the circumferential welding of the welding part. At this time, the notch 19 faces the other side. When the annular adjustment frame 12 is about to rotate 180 degrees, the gear teeth 18 on the annular adjustment frame 12 will mesh with the third gear 36. Then, the third gear 36 drives the rotating rod 20 to reverse, and the locking block 27 releases the fixation of the steel structure above. After rotating 180 degrees, the rotation stops. Then, the first drive source 7 starts operating again, and the welding base frame 4 and positioning top plate 3 continue to drive the steel structure to rotate. The welded steel structure moves out from the notch 19 facing the other side. Then, the second drive source 8 reverses, controlling the annular adjustment frame 12 to reverse and reset. When the roller 24 corresponds to the release notch 34, the elastic element 31 is completely reset, the limit plate 29 is retracted, and the welded steel structure falls and passes through the unloading through hole 6. It can be collected by a special collection device. The same applies to subsequent steel structures. This achieves physical separation and parallel function of the welding station and the loading and unloading station, allowing laser welding, workpiece cooling, gravity unloading, and manual loading to be performed simultaneously. This not only eliminates the waiting and downtime inherent in traditional single-station equipment, but also...By reducing auxiliary time to a low level, equipment utilization and production cycle time are significantly improved, making it particularly suitable for the rapid, large-scale welding production of small-volume steel structure parts.

[0042] It should be noted that when the steel structure enters the middle of the annular adjustment frame 12, the actuating rod 17 corresponds exactly to the support column 23 on one side of the steel structure. When the annular adjustment frame 12 rotates, it will drive the support column 23 and the rotating ring 22 to rotate 180 degrees through the actuating rod 17. The support column 23 and the laser welding mechanism 16 are staggered and do not affect the welding. The annular adjustment frame 12 is set between the positioning top plate 3 and the welding base frame 4. The connection between the positioning top plate 3 and the welding base frame 4 is realized through the rotating ring 22 and the support column 23, that is, the synchronous rotation of the positioning top plate 3 and the welding base frame 4 is realized. At the same time, the annular adjustment frame 12 located between the positioning top plate 3 and the welding base frame 4 will not cause motion interference to the synchronous rotation of the positioning top plate 3 and the welding base frame 4.

[0043] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A multi-angle welding-based steel structure laser welding apparatus, characterized by, The utility model provides a steel structure welding device, including frame, be provided with positioning operation mechanism on frame, positioning operation mechanism includes the bracket of setting in the upper end of frame, the upper end of bracket is rotatably provided with the welding chassis that presents ring, the upper end of welding chassis is provided with the positioning top disc that rotates with the welding chassis, and the periphery of positioning top disc and welding chassis is evenly provided with corresponding positioning through -hole, and the positioning through -hole is adapted with steel structure, and the first drive device for driving the rotation of welding chassis is provided on the frame; It also includes a multi-angle welding mechanism, the multi-angle welding mechanism includes a ring-shaped adjusting frame rotatably arranged at one end between the positioning top disc and the welding chassis, the opposite ends of the ring-shaped adjusting frame are respectively provided with laser welding mechanisms, one side of the ring-shaped adjusting frame is provided with a gap for the entry and exit of the steel structure, the outer side of the ring-shaped adjusting frame is provided with a second gear ring having a gap, and the two sides of the ring-shaped adjusting frame are respectively provided with second gears engaged with the second gear ring, and the lower side of the welding chassis is provided with a second drive device for driving the rotation of the second gears; One end of the frame and the bracket is provided with a blanking through-hole corresponding to the positioning through-hole and used for the falling of the steel structure; The positioning top disc and the welding chassis are connected as a whole through a rotating piece, the rotating piece includes rotating rings rotatably arranged on the opposite side walls of the positioning top disc and the welding chassis and located outside the positioning through-holes, and support columns are mounted at the opposite ends of the corresponding two rotating rings; One end of the inner side of the ring-shaped adjusting frame is provided with a push rod corresponding to the support columns, and when the ring-shaped adjusting frame rotates, the rotating rings and the support columns can be pushed to rotate as a whole through the push rod.

2. The multi-angle welding based steel structure laser welding apparatus according to claim 1, characterized by: The bottom of the welding chassis is provided with a support assembly for limiting the bottom of the steel structure, the support assembly includes a sliding groove provided on the inner wall of the positioning through-hole of the welding chassis, a limiting plate movably arranged in the sliding groove along the radial direction of the positioning through-hole, an elastic member provided between one end of the limiting plate and the inner wall of the sliding groove, and in the initial state of the elastic member, the limiting plate does not protrude from the inner wall of the positioning through-hole, a pair of guide protrusions are provided on the top of the bracket, an annular groove is formed between the two guide protrusions, a traction rod is provided at the bottom of one end of the limiting plate and extends into the annular groove, one end of the annular groove is provided with a narrow groove portion, the other end is provided with a wide groove portion with a width greater than that of the narrow groove portion, a release notch is provided at the junction of the narrow groove portion and the wide groove portion and located on the side wall of the guide protrusion and corresponds to the blanking through-hole, and the junction of the other end is smoothly transitioned through a slope surface.

3. The multi-angle welding based steel structure laser welding apparatus according to claim 2, characterized by: The narrow groove portion corresponds to the multi-angle welding mechanism, and when the lower end of the traction rod is located inside the narrow groove portion and the wide groove portion, one end of the limiting plate protrudes from the inner wall of the positioning through-hole, and when the lower end of the traction rod is located at the release notch, the limiting plate does not protrude from the inner wall of the positioning through-hole.

4. The multi-angle welding based steel structure laser welding apparatus according to claim 2, characterized by: A lower positioning assembly is provided on the welding chassis, and the lower positioning assembly includes a clamping arm provided on the upper end of the limiting plate and synchronously displaced with the limiting plate.

5. The multi-angle welding based steel structure laser welding apparatus according to claim 4, characterized in that: The upper positioning assembly is arranged on the positioning top disc, and comprises mounting through holes arranged on the side wall of the positioning top disc and corresponding to the positioning through holes, rotating rods arranged in the mounting through holes, and locking blocks movably arranged along the axial direction of the mounting through holes and close to the ends of the rotating rods.

6. The multi-angle welding based steel structure laser welding apparatus according to claim 5, characterized by: One end of the rotating rod extends to the outside of the positioning top disc and is provided with a third gear, and one end of the annular adjusting frame is provided with a gear tooth corresponding to and matched with the third gear.

7. The multi-angle welding based steel structure laser welding apparatus according to claim 2, characterized by: The bottom of the traction rod is rotatably provided with a roller.

8. The multi-angle welding based steel structure laser welding apparatus according to claim 1, characterized by: The first driving device comprises a first gear ring arranged on the bottom of the welding chassis, a first gear meshing with one side of the first gear ring, and a first driving source arranged on the rack for driving the first gear to rotate.

9. The multi-angle welding based steel structure laser welding apparatus according to claim 1, characterized by: The top of the bracket and the rack are respectively provided with mounting racks corresponding to the two sides of the annular adjusting frame, and the annular adjusting frame is rotatably arranged on the opposite sides of the upper ends of the two mounting racks. The second driving device comprises a vertical shaft rotatably arranged on the two mounting racks, and the second gear is arranged on the upper end of the vertical shaft, and the lower end of the vertical shaft extends to the bottom of the bracket and is driven to rotate by a second driving source arranged on the rack.

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