High-precision centering steel plant variable cross-section beam laser welding device

Abstract

The invention relates to the technical field of steel beam welding, in particular to a high-precision centering steel plant variable cross-section beam laser welding device which comprises a supporting mechanism, the supporting mechanism comprises a base, a portal frame and a supporting frame, and the portal frame and the supporting frame are fixedly installed on the top of the base and distributed front and back. The angle adjusting assembly pushes the pressing plate and the L-shaped hanging plate to move downwards, the L-shaped hanging plate drives the upper flange to move downwards till the rear end of the upper flange makes contact with the rear end of the web, then the angle adjusting assembly drives the pressing plate and the front end of the L-shaped hanging plate to rotate downwards, the L-shaped hanging plate drives the front end of the upper flange to incline downwards, and therefore the upper flange and the web are fixed. According to the welding method, the lower flange and the web are welded until the front end of the upper flange is placed on the web, then gaps among the lower flange, the web and the upper flange are welded through the first welding head and the second welding head, the situation that after the lower flange and the web are welded together, the web is turned up and down by 180 degrees, and the web and the upper flange are combined together for welding is not needed, and the welding efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of steel beam welding technology, specifically to a high-precision laser welding device for centering variable cross-section beams in steel plantations. Background Technology

[0002] Steel structure factory buildings are industrial buildings that use steel as the main load-bearing component, and are divided into light and heavy types. The main body is composed of steel columns, steel beams, steel roof trusses, and other components. When constructing large-span steel factory buildings, in order to improve the support strength and reduce material waste, variable cross-section steel beams are usually used to make roof and factory building beams. Compared with constant cross-section beams, steel materials can be saved by 15%-30%, the self-weight is significantly reduced, and the light weight of steel beams results in less seismic force; the use of wedge-shaped roof beams can increase the building's net height.

[0003] Variable cross-section steel beams are generally welded from wedge-shaped webs and upper and lower flanges. When welding variable cross-section steel beams, existing welding equipment typically involves first centering and pressing the web onto the lower flange, then welding the web and lower flange together. Next, the welded web and lower flange are rotated 180 degrees so that the web is centered and pressed onto the upper flange, and then the web and upper flange are welded together again. Existing welding equipment requires two welding operations to weld the web and upper and lower flanges together, and the welding efficiency needs to be further improved. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a high-precision laser welding device for variable cross-section beams in steel plantations, comprising a support mechanism. The support mechanism includes a base and a gantry frame and a support frame that are fixedly installed on the top of the base and distributed front to back.

[0005] The inclined beam mechanism includes a pressure plate disposed at the bottom of a support frame. The bottom of the pressure plate is fixedly connected to L-shaped hanging plates symmetrically distributed on the left and right. An angle adjustment component for driving the pressure plate to move up and down and rotate back and forth is installed at the bottom of the support frame.

[0006] The clamping mechanism includes a movable plate and a slide that are movably installed between two vertical sections of the gantry and distributed vertically. A return spring is fixedly connected between the movable plate and the slide. A hydraulic push rod for driving the movable plate to move up and down is fixedly installed on the horizontal section of the gantry.

[0007] The welding mechanism includes sliding frames symmetrically arranged on the top of the base. A welding head one is fixedly installed on the front side of the sliding frame, and a welding head two is slidably installed on the sliding frame. A height adjustment component for guiding the welding head two to rise and fall with the change of the steel beam cross-section height is installed on the sliding frame. An electric push rod three for pushing the sliding frame to move closer to the center of the base is installed on the front side of the gantry.

[0008] In one possible implementation, a support platform is mounted on the top of the base below the horizontal section of the gantry frame, and a plurality of drive wheels equidistantly distributed at the front and rear are rotatably mounted on the support platform. Roller frames are also mounted on the front and rear sides of the base, and the top of the roller frames is flush with the top of the drive wheels.

[0009] In one possible implementation, the top of the base is also equipped with a roller pressing mechanism that is symmetrically distributed front and back. The roller pressing mechanism includes a pressing roller that is disposed on the top of the support platform and symmetrically distributed left and right. The top of the base is equipped with a lifting assembly for driving the pressing roller to move up and down for adjustment.

[0010] In one possible implementation, the top of the base is also equipped with a centering mechanism located between the front and rear roller pressing mechanisms. The centering mechanism includes a pushing roller 1 disposed on the top of the support platform and symmetrically distributed on the left and right. The top of the base is fixedly mounted with an electric push rod 1 for pushing the pushing roller 1 to move towards the center of the base via a support column. The telescopic section of the electric push rod 1 is rotatably connected to the corresponding pushing roller 1.

[0011] In one possible implementation, the angle adjustment assembly includes two electrically driven push rods hinged to the bottom of the support frame and distributed front to back. The bottom of the telescopic section of the electrically driven push rod is hinged to a mounting base, the bottom of which is fixedly connected to the top of the pressure plate. Several rollers are rotatably mounted on the horizontal section of the pressure plate and the L-shaped hanging plate, which are distributed at equal intervals front to back.

[0012] In one possible implementation, the left and right ends of the carriage are slidably connected to the vertical section of the gantry frame, and the top of the carriage is fixedly connected with guide rods symmetrically distributed on the left and right. The top of the guide rods slides through to the top of the movable plate and is then fitted with a baffle. The bottom of the carriage is rotatably fitted with a rolling roller located directly above the support platform.

[0013] In one possible implementation, the height adjustment assembly includes a slider slidably mounted on a slide frame, a second welding head fixedly mounted on the slider, a linkage rod fixedly connected to the rear side of the slider, a guide groove fixedly mounted on the front side of the slide frame, and the rear end of the linkage rod slidably connected to the corresponding guide groove in the left and right directions.

[0014] In one possible implementation, the base is also equipped with limiting mechanisms located on the front and rear sides of the gantry and symmetrically distributed left and right. The limiting mechanisms include a lower limiting wheel and an upper limiting wheel arranged above the support platform and distributed from bottom to top. The outer ring surface of the upper limiting wheel is provided with a groove. The support platform is equipped with a telescopic component for supporting the lower limiting wheel and the upper limiting wheel.

[0015] In one possible implementation, the telescopic assembly includes a fixed rod fixedly mounted on the top of a support platform, a movable rod slidably mounted on the top of the fixed rod, and a second return spring sleeved on the outside of the movable rod, the top of the second return spring being fixedly connected to the outer ring wall of the movable rod. Support arms are bolted to both the fixed rod and the movable rod, the lower limit wheel is rotatably mounted on the lower support arm, and the upper limit wheel is rotatably mounted on the upper support arm.

[0016] The beneficial effects of this invention are as follows: 1. This invention uses an angle adjustment component to push the pressure plate and L-shaped hanging plate downwards. The L-shaped hanging plate drives the upper flange downwards until the rear end of the upper flange contacts the rear end of the web. Then, the angle adjustment component drives the front end of the pressure plate and L-shaped hanging plate downwards. The L-shaped hanging plate drives the front end of the upper flange downwards until the front end of the upper flange is placed on the web. Then, welding head one and welding head two are used to weld the gap between the lower flange, web, and upper flange. At the same time, the steel beam is pushed forward to complete the welding of the steel beam. When the steel beam moves forward, as the height of the web gradually increases, the slide will move upwards under the push of the steel beam. The slide guides welding head two upwards through the height adjustment component, so that welding head two can always be aligned with the gap between the web and the upper flange for welding. This makes it easy to weld the lower flange, web, and upper flange together in one go. It is not necessary to weld the lower flange and web together and then rotate the web 180 degrees up and down to combine the web and the upper flange for welding, thus improving the welding efficiency.

[0017] 2. This invention uses a combination of a roller pressing mechanism, a centering mechanism, a tilting beam mechanism, a pressing mechanism, and a limiting mechanism to limit the movement of the steel beam. A pressing roller presses against the lower flange to prevent vertical movement. A pushing roller supports the web on both sides to prevent horizontal movement. Lower and upper limiting rollers support the lower and upper flanges on their respective sides to prevent horizontal movement. A rolling roller presses against the top of the upper flange to prevent vertical movement of the steel beam. During the movement of the steel beam, the rolling roller and pressing plate can adjust their height according to the changes in web height, always pressing and limiting the steel beam to ensure stability during welding and improve welding accuracy. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a three-dimensional structural diagram of the support mechanism of the present invention from the first angle.

[0020] Figure 3 This is a three-dimensional structural diagram of the support mechanism of the present invention from the second angle.

[0021] Figure 4 This is a three-dimensional structural diagram of the roller pressing mechanism of the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the inclined beam mechanism of the present invention.

[0023] Figure 6 This is a three-dimensional structural diagram of the clamping mechanism of the present invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the welding mechanism of the present invention.

[0025] Figure 8 This is a three-dimensional structural diagram of the adjustment component of the present invention.

[0026] Figure 9 This is a three-dimensional structural diagram of the limiting mechanism of the present invention.

[0027] In the diagram: 1. Support mechanism; 11. Base; 12. Gantry frame; 13. Support platform; 14. Drive wheel; 15. Support frame; 16. Roller frame; 2. Roller pressing mechanism; 21. Pressing roller one; 22. Lifting assembly; 3. Centering mechanism; 31. Pushing roller one; 32. Electric push rod one; 4. Inclined beam mechanism; 41. Pressure plate; 42. L-shaped hanging plate; 43. Roller; 44. Angle adjustment assembly; 441. Electric push rod two; 442. Mounting seat; 5. Pressing mechanism; 51. Movable plate; 52. Slide carriage; 531. Guide 532. Roller; 53. Return spring one; 54. Hydraulic push rod; 6. Welding mechanism; 61. Sliding frame; 62. Welding head one; 63. Welding head two; 64. Height adjustment assembly; 641. Slider; 642. Linkage rod; 643. Guide groove; 65. Electric push rod three; 66. Connecting frame; 67. Pushing wheel two; 7. Limiting mechanism; 71. Lower limit wheel; 72. Upper limit wheel; 73. Telescopic assembly; 731. Fixed rod; 732. Movable rod; 733. Return spring two; 734. Support arm. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Please see Figure 1 - Figure 9A high-precision laser welding device for variable cross-section beams of steel plant buildings includes a support mechanism 1. The support mechanism 1 includes a base 11 and a gantry 12 and a support frame 15 that are fixedly installed on the top of the base 11 and distributed in the front and back. A support platform 13 located below the horizontal section of the gantry 12 is installed on the top of the base 11.

[0030] The inclined beam mechanism 4 includes a pressure plate 41 set at the bottom of the support frame 15. The bottom of the pressure plate 41 is fixedly connected to L-shaped hanging plates 42 that are symmetrically distributed on the left and right. An angle adjustment component 44 for driving the pressure plate 41 to move up and down and rotate back and forth is installed at the bottom of the support frame 15.

[0031] The clamping mechanism 5 includes a movable plate 51 and a slide 52 that are movably installed between the two vertical sections of the gantry frame 12 and distributed vertically. A return spring 53 is fixedly connected between the movable plate 51 and the slide 52. A hydraulic push rod 54 for driving the movable plate 51 to move up and down is fixedly installed on the horizontal section of the gantry frame 12. The bottom end of the telescopic section of the hydraulic push rod 54 is fixedly connected to the top of the movable plate 51.

[0032] Welding mechanism 6 includes a sliding frame 61 symmetrically arranged on the top of base 11. Welding head 62 is fixedly installed on the front side of the sliding frame 61, and welding head 63 is slidably installed on the sliding frame 61. A height adjustment component 64 is installed on the slide frame 52 to guide welding head 63 to rise and fall with the change of steel beam cross-section height. An electric push rod 65 is installed on the front side of the gantry frame 12 to push the sliding frame 61 to move closer to the center of base 11. A connecting frame 66 is fixedly connected to the rear side of the sliding frame 61. A pushing wheel 67 is rotatably installed on the side of the connecting frame 66 near the center of support mechanism 1. The telescopic shaft of the electric push rod 65 is fixedly connected to the connecting frame 66.

[0033] In practical use, the lower flange is placed on the support platform 13, and then the web is placed vertically on the lower flange, with the height of the web gradually increasing from front to back. Then, the upper flange is inserted between the two L-shaped hanging plates 42 on the left and right. The angle adjustment component 44 pushes the pressure plate 41 and the L-shaped hanging plate 42 to move downward. The L-shaped hanging plate 42 drives the upper flange to move downward until the rear end of the upper flange contacts the rear end of the web. Then, the angle adjustment component 44 drives the front end of the pressure plate 41 and the L-shaped hanging plate 42 to rotate downward. The L-shaped hanging plate 42 drives the front end of the upper flange to tilt downward until the upper flange is completely placed on the web. This allows the lower flange, web, and upper flange of the steel beam to be assembled from bottom to top in sequence, making it convenient to weld the lower flange, web, and upper flange together in one go. It eliminates the need to weld the lower flange and web together and then rotate the web 180 degrees up and down to assemble the web and upper flange together for welding, thus improving welding efficiency.

[0034] Then, the assembled steel beam is moved forward as a whole. When the steel beam moves to the clamping mechanism 5, the hydraulic push rod 54 pushes the movable plate 51 and the slide 52 downward, so that the slide 52 clamps the lower flange, web and upper flange, improving the tightness of the splicing of the lower flange, web and upper flange. While the slide 52 is descending, the height adjustment component 64 guides the second welding head 63 to move downward, so that the second welding head 63 is aligned with the gap between the web and the upper flange. At the same time, the first welding head 62 is aligned with the gap between the web and the lower flange. Then, the electric push rod 65 pushes the slide frame 61 to move towards the center of the base 11, so that the second welding head 63 and the first welding head 62 are close to the gaps on the upper and lower sides of the web. At the same time, the slide frame 61 drives the second pushing wheel 67 to move towards the center of the base 11, so that the second pushing wheel 67 is supported on the left and right sides of the web, improving the stability of the web welding.

[0035] Welding is performed on the gap between the lower flange, web, and upper flange using welding head 62 and welding head 63. At the same time, the entire steel beam is pushed forward to complete the welding. As the steel beam moves forward, the height of the web gradually increases, and the slide 52 moves upward under the push of the steel beam. The slide 52 guides welding head 63 upward through the height adjustment component 64, so that welding head 63 can always be aligned with the gap between the web and the upper flange for welding, which reduces production costs and improves welding accuracy.

[0036] Please see Figure 1 , Figure 2 and Figure 4 The support platform 13 is rotatably mounted with several drive wheels 14 evenly distributed in front and behind. Roller frames 16 are also mounted on the front and rear sides of the base 11. The top of the roller frames 16 is flush with the top of the drive wheels 14. The support platform 13 is also equipped with a motor for driving the drive wheels 14.

[0037] In practical use, the steel beam is supported by the roller frame 16, which facilitates the loading and unloading of the steel beam. The steel beam is driven and supported by the drive wheel 14 on the support platform 13, which reduces the friction between the steel beam and the support platform 13. The steel beam is driven forward by the drive wheel 14, which facilitates welding of the steel beam from front to back.

[0038] Please see Figure 1 , Figure 3 and Figure 4 The top of the base 11 is also equipped with a roller pressing mechanism 2 symmetrically distributed front and back. The roller pressing mechanism 2 includes a pressing wheel 21 symmetrically distributed on the top of the support platform 13. The top of the base 11 is equipped with a lifting assembly 22 for driving the pressing wheel 21 to move up and down for adjustment. It should be noted that the lifting assembly 22 is an existing structure and is a screw lifting platform.

[0039] In practical use, when the steel beam moves on the support platform 13, the lifting assembly 22 drives the pressing wheel 21 to move downward, so that the pressing wheel 21 rolls onto the lower flange, which can improve the stability of the lower flange when it moves, thereby improving the welding accuracy of the lower flange, web and upper flange.

[0040] Please see Figure 1 , Figure 3 and Figure 4 The top of the base 11 is also equipped with a centering mechanism 3 located between the front and rear roller pressing mechanisms 2. The centering mechanism 3 includes a pushing wheel 31 that is symmetrically distributed on the top of the support platform 13. The top of the base 11 is fixedly installed with an electric push rod 32 for pushing the pushing wheel 31 to move closer to the center of the base 11 via a support column. The telescopic section of the electric push rod 32 is rotatably connected to the corresponding pushing wheel 31.

[0041] In practical use, when the web plate is placed on the lower flange, the electric push rod 32 pushes the pusher wheel 31 to move towards the center of the base 11. The pusher wheel 31 supports and limits the web plate from both sides, so that the web plate and the lower flange are aligned in the center. At the same time, the pusher wheel 31 can support the web plate to prevent it from being skewed, and further improve the accuracy of welding the web plate and the lower flange.

[0042] Please see Figure 3 and Figure 5 The angle adjustment component 44 includes an electric push rod 441 hinged to the bottom of the support frame 15 and distributed front and back. The bottom of the telescopic section of the electric push rod 441 is hinged to a mounting base 442. The bottom of the mounting base 442 is fixedly connected to the top of the pressure plate 41. Several rollers 43 are rotatably installed on the horizontal section of the pressure plate 41 and the L-shaped hanging plate 42, which are distributed at equal intervals front and back.

[0043] In practical use, after the upper flange is placed between the two L-shaped hanging plates 42, the roller 43 can reduce the friction between the upper flange and the pressure plate 41 and the L-shaped hanging plate 42, making it easier for the upper flange to move between the pressure plate 41 and the L-shaped hanging plate 42. When the two electric push rods 441 extend and retract synchronously, they can push the pressure plate 41 and the L-shaped hanging plate 42 to move up and down. The L-shaped hanging plate 42 drives the upper flange to move up and down, making it easier to place the upper flange on the web. Since the web is lower in the front and higher in the back, the rear end of the web will contact the bottom of the upper flange first. At this time, the electric push rod 441 on the rear side stops extending and retracting, while the electric push rod 441 on the front side continues to extend and pushes the front side of the pressure plate 41 to tilt downward, so that the front end of the upper flange tilts downward and is completely combined with the web. When the steel beam moves forward, the two electric push rods 441 at the front and rear simultaneously drive the pressure plate 41 to move upward, so that the pressure plate 41 and the L-shaped hanging plate 42 can adapt to the front and rear changes in the height of the steel beam.

[0044] Please see Figure 1 , Figure 6 and Figure 7 The left and right ends of the slide 52 are slidably connected to the vertical section of the gantry frame 12. The top of the slide 52 is fixedly connected with guide rods 531 that are symmetrically distributed on the left and right. The top of the guide rods 531 slides through to the top of the movable plate 51 and then a baffle is installed. The bottom of the slide 52 is rotatably installed with a rolling wheel 532 located directly above the support platform 13.

[0045] In practical use, the guide rod 531 guides and limits the slide 52, allowing the slide 52 to move up and down at the bottom of the movable plate 51. When the movable plate 51 moves downward, it can drive the slide 52 to move downward together. When the rolling roller 532 at the bottom of the slide 52 can press against the upper flange, the rolling roller 532 can reduce the friction between the slide 52 and the upper flange, making it easier for the steel beam to move forward at the bottom of the slide 52. When the rolling roller 532 presses against the top of the steel beam, the return spring 53 will be compressed and contracted. When the steel beam moves forward, as the height of the web plate gradually increases, the steel beam can push the slide 52 upward, so that the rolling roller 532 can always press against the steel beam.

[0046] Please see Figure 1 , Figure 6 , Figure 7 and Figure 8 The height adjustment component 64 includes a slider 641 that is slidably mounted on the slide frame 61, a welding head 63 that is fixedly mounted on the slider 641, a linkage rod 642 that is fixedly connected to the rear side of the slider 641, a guide groove 643 that is fixedly mounted on the front side of the slide frame 52, and the rear end of the linkage rod 642 that is slidably connected to the corresponding guide groove 643.

[0047] In practical use, when the slide 52 moves up and down, the slide 52 drives the slider 641 to move up and down through the linkage rod 642. The slider 641 drives the welding head 63 to move up and down, which can adjust the height of the welding head 63 so that the welding head 63 can be aligned with the gap between the web and the upper flange, making it easier for the welding head 63 to weld the steel beam with a variable cross section.

[0048] Please see Figure 1 , Figure 3 and Figure 9 The base 11 is also equipped with limiting mechanisms 7 located on the front and rear sides of the gantry frame 12 and symmetrically distributed left and right. The limiting mechanism 7 includes a lower limiting wheel 71 and an upper limiting wheel 72 arranged above the support platform 13 and distributed from bottom to top. The outer ring surface of the upper limiting wheel 72 is provided with a groove. The support platform 13 is equipped with a telescopic component 73 for supporting the lower limiting wheel 71 and the upper limiting wheel 72.

[0049] In practical use, when the steel beam moves from back to front on the support platform 13, the lower limit wheel 71 rolls and supports the left and right sides of the lower flange, and the upper limit wheel 72 rolls and supports the left and right sides of the upper flange. The groove on the upper limit wheel 72 can be locked on the edge of the upper flange to prevent the upper limit wheel 72 from separating from the upper flange. The lower limit wheel 71 and the upper limit wheel 72 are used to center and limit the lower flange and the upper flange, so as to avoid the lower flange and the upper flange from deflecting when moving, and improve the stability of the steel beam welding.

[0050] Please see Figure 1 , Figure 3 and Figure 9 The telescopic assembly 73 includes a fixed rod 731 fixedly installed on the top of the support platform 13. A movable rod 732 is slidably installed on the top of the fixed rod 731. A second return spring 733 is also installed on the top of the fixed rod 731 and sleeved on the outside of the movable rod 732. The second return spring 733 is in a compressed state. The top of the second return spring 733 is fixedly connected to the outer ring wall of the movable rod 732. Support arms 734 are bolted to both the fixed rod 731 and the movable rod 732. The lower limit wheel 71 is rotatably installed on the lower support arm 734, and the upper limit wheel 72 is rotatably installed on the upper support arm 734.

[0051] In practical use, when the steel beam is placed on the support platform 13, the lower limit wheel 71 and the upper limit wheel 72 are moved closer to the center of the base 11 by rotating the support arm 734. This allows the lower limit wheel 71 and the upper limit wheel 72 to be supported on the left and right sides of the lower flange and the upper flange, respectively, which facilitates the centering and limiting of the lower flange and the upper flange and prevents the steel beam from being skewed during welding. When the steel beam moves forward, as the height of the web plate gradually increases, the return force of the return spring 733 pushes the movable rod 732 to move upward. The movable rod 732 drives the upper limit wheel 72 to move upward, so that the upper limit wheel 72 is always aligned with the upper flange.

[0052] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-precision laser welding device for variable cross-section beams in a steel plant, characterized in that: Includes a support mechanism (1), which includes a base (11) and a gantry frame (12) and a support frame (15) fixedly installed on the top of the base (11) and distributed in the front and back. Inclined beam mechanism (4), the inclined beam mechanism (4) includes a pressure plate (41) set at the bottom of the support frame (15), the bottom of the pressure plate (41) is fixedly connected to an L-shaped hanging plate (42) symmetrically distributed on the left and right, and the bottom of the support frame (15) is equipped with an angle adjustment component (44) for driving the pressure plate (41) to move up and down and rotate back and forth. The clamping mechanism (5) includes a movable plate (51) and a slide (52) that are movably installed between two vertical sections of the gantry frame (12) and distributed vertically. A return spring (53) is fixedly connected between the movable plate (51) and the slide (52). A hydraulic push rod (54) for driving the movable plate (51) to move up and down is fixedly installed on the horizontal section of the gantry frame (12). The welding mechanism (6) includes a sliding frame (61) symmetrically arranged on the top of the base (11). A welding head (62) is fixedly installed on the front side of the sliding frame (61). A welding head (63) is slidably installed on the sliding frame (61). A height adjustment component (64) for guiding the welding head (63) to rise and fall with the change of the steel beam cross-section height is installed on the slide (52). An electric push rod (65) for pushing the sliding frame (61) to move closer to the center of the base (11) is installed on the front side of the gantry (12).

2. The high-precision laser welding device for variable cross-section beams in a steel plant as described in claim 1, characterized in that: The base (11) is equipped with a support platform (13) located below the horizontal section of the gantry frame (12). Several drive wheels (14) are rotatably mounted on the support platform (13) and are distributed at equal intervals. Roller frames (16) are also installed on the front and rear sides of the base (11). The top of the roller frames (16) is flush with the top of the drive wheels (14).

3. The high-precision laser welding device for variable cross-section beams in a steel plant according to claim 2, characterized in that: The top of the base (11) is also equipped with a roller pressing mechanism (2) symmetrically distributed in front and back. The roller pressing mechanism (2) includes a pressing wheel (21) set on the top of the support platform (13) and symmetrically distributed in the left and right. The top of the base (11) is equipped with a lifting component (22) for driving the pressing wheel (21) to move up and down for adjustment.

4. The high-precision laser welding device for variable cross-section beams in a steel plant according to claim 3, characterized in that: The top of the base (11) is also equipped with a centering mechanism (3) located between the front and rear roller pressing mechanisms (2). The centering mechanism (3) includes a pusher wheel (31) set on the top of the support platform (13) and symmetrically distributed on the left and right. The top of the base (11) is fixedly installed with an electric push rod (32) for pushing the pusher wheel (31) to move towards the center of the base (11) by a support column. The telescopic section of the electric push rod (32) is rotatably connected to the corresponding pusher wheel (31).

5. The high-precision laser welding device for variable cross-section beams in a steel plant as described in claim 1, characterized in that: The angle adjustment assembly (44) includes an electric push rod two (441) hinged to the bottom of the support frame (15) and distributed in the front and back. The bottom of the telescopic section of the electric push rod two (441) is hinged to a mounting seat (442). The bottom of the mounting seat (442) is fixedly connected to the top of the pressure plate (41). Several rollers (43) are rotatably installed on the horizontal section of the pressure plate (41) and the L-shaped hanging plate (42) and are distributed at equal intervals in the front and back.

6. The high-precision laser welding device for variable cross-section beams in a steel plant as described in claim 1, characterized in that: The left and right ends of the slide (52) are slidably connected to the vertical section of the gantry (12). The top of the slide (52) is fixedly connected with guide rods (531) that are symmetrically distributed on the left and right. The top of the guide rod (531) slides through to the top of the movable plate (51) and then a baffle is installed. The bottom of the slide (52) is rotatably installed with a rolling wheel (532) located directly above the support platform (13).

7. The high-precision laser welding device for variable cross-section beams in a steel plant according to claim 6, characterized in that: The height adjustment assembly (64) includes a slider (641) slidably mounted on a slide frame (61), a welding head (63) fixedly mounted on the slider (641), a linkage rod (642) fixedly connected to the rear side of the slider (641), a guide groove (643) fixedly mounted on the front side of the slide frame (52), and the rear end of the linkage rod (642) slidably connected to the corresponding guide groove (643) in the left and right directions.

8. The high-precision laser welding device for variable cross-section beams in a steel plant according to claim 2, characterized in that: The base (11) is also equipped with limiting mechanisms (7) located on the front and rear sides of the gantry (12) and symmetrically distributed left and right. The limiting mechanism (7) includes a lower limiting wheel (71) and an upper limiting wheel (72) arranged above the support platform (13) and distributed from bottom to top. The outer ring surface of the upper limiting wheel (72) is provided with a groove. The support platform (13) is equipped with a telescopic component (73) for supporting the lower limiting wheel (71) and the upper limiting wheel (72).

9. The high-precision laser welding device for variable cross-section beams in a steel plant as described in claim 8, characterized in that: The telescopic assembly (73) includes a fixed rod (731) fixedly installed on the top of the support platform (13). A movable rod (732) is slidably installed on the top of the fixed rod (731). A second return spring (733) is also installed on the top of the fixed rod (731) and sleeved on the outside of the movable rod (732). The top of the second return spring (733) is fixedly connected to the outer ring wall of the movable rod (732). Support arms (734) are installed on both the fixed rod (731) and the movable rod (732) by bolts. The lower limit wheel (71) is rotatably installed on the lower support arm (734), and the upper limit wheel (72) is rotatably installed on the upper support arm (734).

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