Anti-deviation laser welding equipment and welding method for I-shaped steel beam

Abstract

The invention relates to the technical field of steel beam welding, in particular to I-shaped steel beam anti-deviation laser welding equipment and a welding method. A base is arranged, a beam body is arranged on the base, a hydraulic cylinder is installed on the beam body, and a downward pressing piece is arranged at the action end of the hydraulic cylinder; the supporting rollers are distributed in the length direction of the base; the driving device is used for pulling the welded I-shaped steel beam body; the number of the side plates is two, pressing assemblies capable of relatively moving are arranged between the two side plates, each pressing assembly comprises a lifting frame, the lifting frame is installed on the side plates in a sliding mode, two self-hinged connecting arms are rotatably installed on the lifting frame, and clamping rollers are rotatably installed at the ends of the connecting arms; and the support is rotationally connected with the lifting frame, a supporting piece is fixed to the end of the support, the support is connected with the connecting arm through a restraining structure, the restraining structure can make the supporting piece parallel to the connecting line of the rotating shafts of the two sets of clamping rollers located on the same side of the I-shaped steel beam body, and the welding process quality is improved.

Description

Technical Field

[0001] This invention relates to the field of steel beam welding technology, specifically to a laser welding device and welding method for preventing the offset of I-beams. Background Technology

[0002] In existing laser welding production lines for I-beams, a step-by-step positioning approach is commonly adopted: "centering the web first, then pressing the flanges." This involves setting independent guide rollers or lateral pressure rollers for the flanges and webs, and using support rollers at fixed intervals in the traction direction to maintain straightness. When the beam length is short and the cross-sectional specifications are uniform, this method can still ensure the geometric repeatability accuracy of the welding section. However, for ultra-long beams of 12m and above, the flanges accumulate initial lateral bending and local warping along the length direction during rolling, flame cutting, hoisting, and self-weight stacking. The actual curve of its edge often has an angle of 1° to 3° with the theoretical centerline.

[0003] Traditional rigid lateral guide wheels must apply significant positive pressure to "straighten" the wing plates to correct this deviation. This leads to a sharp increase in the load on the traction motor, accelerated roller wear, and instantaneous resistance fluctuations transmitted through the web to the welded area, inducing micro-cracks in the weld. If the clamping force is reduced or a floating follower mechanism is used, the wing plates will repeatedly deviate from the theoretical center during forward movement due to insufficient lateral stiffness. This causes changes in the relative position between the web and the wing plates, resulting in periodic fluctuations in weld quality along the length direction, directly weakening the load-bearing capacity and dimensional accuracy of the finished product. Summary of the Invention

[0004] The purpose of this invention is to provide a laser welding device and welding method for preventing the offset of I-beams, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A laser welding device for preventing the offset of I-beams includes: A base, on which a beam is provided, and a hydraulic cylinder is mounted on the beam, with a pressing component provided on the actuating end of the hydraulic cylinder; Multiple sets of support rollers are provided and distributed along the length direction of the base; A drive device is mounted on the base, and the drive device is used to pull the welded I-beam body. The side panels are provided in two sets, and a pressing assembly capable of relative movement is provided between the two sets of side panels. The pressing assembly includes: A lifting frame is slidably mounted on the side plate. Two sets of self-hinged connecting arms are rotatably mounted on the lifting frame, and clamping rollers are rotatably mounted at the ends of the connecting arms. The bracket is rotatably connected to the lifting frame. A support member is fixed at the end of the bracket, and the bracket and the connecting arm are connected by a constraint structure. The constraint structure enables the support member to be parallel to the line connecting the rotation axes of the two sets of clamping rollers located on the same side of the I-beam body.

[0006] As described above, the anti-deviation laser welding equipment for I-beams has a sliding groove on the side plate, and the lifting frame is slidably disposed within the sliding groove. A first electric telescopic rod is also fixedly installed on the side plate, and the actuating end of the first electric telescopic rod is connected to the lifting frame.

[0007] The laser welding equipment for preventing deviation of I-beams as described above: the pressing assembly further includes two sets of bidirectional traction structures disposed on the lifting frame, the bidirectional traction structures connecting the ends of the two sets of connecting arms; The bidirectional traction structure includes a connecting plate that slides on the lifting frame, and a bidirectional lead screw is rotatably mounted on the connecting plate. The bidirectional lead screw is threadedly connected to a threaded sleeve that connects to the connecting arm.

[0008] The laser welding equipment for preventing deviation of I-beams as described above: the bidirectional traction structure also includes a drive motor fixedly installed on the connecting plate, and a first gear is connected to the output of the drive motor, the first gear meshing with a second gear connected to the bidirectional lead screw; The circumferential radius of the first gear is smaller than that of the second gear.

[0009] As described above, the anti-deviation laser welding equipment for I-beams: the rotation axis of the bracket and the lifting frame is coaxial with the rotation axis of the connecting arm and the lifting frame; The support includes a pressure plate fixedly connected to the bracket. The pressure plate has an "L" shaped structure and multiple sets of pressure rollers that rotate at equal intervals along its length.

[0010] The laser welding equipment for preventing deviation of I-beams as described above: the constraint structure includes a horizontal shaft that slides through the support, and two sets of connecting shafts are rotatably installed at one end of the horizontal shaft. The connecting shafts are rotatably connected to the connecting positions provided on the connecting arm.

[0011] The laser welding equipment for preventing offset of I-beams as described above: the surface of the clamping roller is formed with an inner conical surface.

[0012] The laser welding equipment for preventing offset of I-beams, as described above, also includes: A guide member is fixedly installed on the beam, and a sliding plate is slidably installed on the guide member. The sliding plate is connected to a second electric telescopic rod installed on the beam. A support shaft is connected to the sliding plate via an adjustment structure, which is used to adjust the distance between the support shaft and the I-beam body. The laser welding head is provided in four sets and is respectively arranged on both sides of the I-shaped steel beam body. The laser welding head is connected to a pin. An elastic clamping assembly connects the support shaft and the laser welding head, and the elastic clamping assembly enables the laser welding head to be aligned with the welding position of the I-beam body.

[0013] As described above, the anti-deviation laser welding equipment for I-beams includes an elastic clamping assembly comprising a guide plate rotatably connected to the laser welding head and a support shaft connected to the adjustment structure. The guide plate is provided with a sliding connection part, which is slidably connected to the support shaft and connected to a cylindrical spring provided on the support shaft. The elastic clamping assembly also includes a convex shaft connected to the laser welding head, the convex shaft being able to slide within an arcuate groove provided on the guide plate.

[0014] A method for welding I-beams using the aforementioned anti-deviation laser welding equipment includes the following steps: Step 1: By controlling the movement of the first electric telescopic rod, the two sets of pressing components move away from each other, while the two sets of clamping rollers located on both sides of the I-beam body are kept at the maximum distance through the bidirectional traction structure; Step 2: Place the flange, web, and flange that are welded to form the body of the I-beam onto the support rollers in sequence, while simultaneously passing the web through the corresponding two sets of support members; Step 3: Reverse control of the first electric telescopic rod and the bidirectional traction structure to make the clamping roller abut against the side of the wing plate; Step 4: Control the movement of the second electric telescopic rod to make the sliding plate reach the predetermined height. Then, through the adjustment structure, drive the elastic clamping assembly and laser welding head to move towards the web plate until the ejector pin abuts against the right angle connection between the wing plate and the web plate. Step 5: Start the drive device to pull the I-beam body, while the laser welding head welds the unwelded flanges and webs.

[0015] Compared with the prior art, the beneficial effects of the present invention are: By using the designed pressing components, firstly, the angle of the pressing plate can change in real time with the movement direction of the flange, thereby adjusting the position of the web plate relative to the flange plate in real time and ensuring the accuracy of the relative position between the web plate and the flange plate. That is, the positioning of the web plate is achieved by positioning the flange plate, achieving the effect of real-time correction. Moreover, the two are mechanically interlocked to ensure the accuracy of the relative position. Secondly, the middle of the two sets of clamping parts is located at the halfway point in the width direction of the flange plate, so that the web plate can be maintained at the halfway point in the width direction of the flange plate, thereby ensuring the accuracy of the position of the web plate relative to the flange plate during welding. In addition, the clamping parts provide support for the flange plate, ensuring that the web plate and the flange plate remain perpendicular to each other. Even when the flange plate has sufficient downward pressure on the web plate, the web plate can still remain perpendicular to the web plate. This can prevent the flange plate from bending under pressure and causing structural damage to the welded position due to the reset deformation when separating from the clamping roller after welding, resulting in a decrease in weld strength. Through the design of guide components, support shafts, laser welding heads, and elastic clamping components, firstly, the laser welding head is guided by the ejector pin, ensuring that it is stably positioned at the connection between the web and the flange. Secondly, when the edge of the web deforms, the ejector pin can drive the laser welding head to change position accordingly, keeping the distance between the laser welding head and the actual welding position consistent, thus avoiding fluctuations in weld penetration / width and preventing undercut, oxidation, and spatter. Furthermore, the two sets of laser welding heads can be matched with webs of different widths by changing their deflection angle, making them applicable to welding different types of I-beam bodies within a certain range. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a laser welding equipment for preventing the offset of I-beams.

[0017] Figure 2 This is a front view of the pressing component and the I-beam body in the laser welding equipment for preventing I-beam deviation.

[0018] Figure 3 This is a three-dimensional structural diagram of the pressing component and the I-shaped steel beam in the laser welding equipment for preventing I-shaped steel beam deviation.

[0019] Figure 4 This is a schematic diagram of the bidirectional tension structure in the laser welding equipment for preventing offset of I-beams.

[0020] Figure 5 This is a schematic diagram of the bidirectional tension structure at another angle in the laser welding equipment for preventing offset of I-beams.

[0021] Figure 6This is an exploded view of the lifting frame, support, connecting arm, and clamping roller in the laser welding equipment for preventing deviation of I-beams.

[0022] Figure 7 This is a front view of the guide components, support shaft, laser welding head, and elastic clamping assembly in the laser welding equipment for preventing deviation of I-beams.

[0023] Figure 8 This is a schematic diagram of the elastic clamping component in the laser welding equipment for preventing deviation of I-beams.

[0024] Figure 9 This is an exploded view of the elastic clamping assembly in the laser welding equipment for preventing deviation of I-beams.

[0025] In the diagram: 1. Base; 2. Beam; 3. Hydraulic cylinder; 4. Support roller; 5. Drive unit; 6. I-beam body; 7. Side plate; 701. Slide groove; 8. First electric telescopic rod; 9. Lifting frame; 901. Hysteresis groove; 10. Bracket; 11. Pressure plate; 12. Pressure roller; 13. Horizontal shaft; 14. Connecting shaft; 15. Connecting arm; 16. Clamping roller; 1601. Inner conical surface; 17. Connecting position; 18. Connecting plate; 19. Drive motor 20. First gear; 21. Second gear; 22. Double-acting lead screw; 23. Threaded sleeve; 24. Second electric telescopic rod; 25. Guide component; 26. Sliding plate; 27. Third electric telescopic rod; 28. Guide shaft; 29. ​​Guide sleeve; 30. Support shaft; 31. Cylindrical spring; 32. Guide plate; 3201. Arc groove; 3202. Sliding connection; 33. Laser welding head; 3301. Convex shaft; 34. Ejector pin. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] Please see Figures 1-9 As an embodiment of the present invention, the anti-deviation laser welding equipment for I-beams includes: a base 1, a support roller 4, a drive device 5, a side plate 7, a lifting frame 9, and a support 10.

[0028] A beam 2 is provided on the base 1, and a hydraulic cylinder 3 is installed on the beam 2. A pressing component is provided on the actuating end of the hydraulic cylinder 3. Multiple sets of the support rollers 4 are provided and distributed along the length direction of the base 1; The driving device 5 is mounted on the base 1. The driving device 5 is used to pull the welded I-beam body 6. It should be noted that the driving device 5 is equipped with a top pressure roller and a bottom rotating roller. The pressure roller and the rotating roller can clamp the welded I-beam body 6. When the rotating roller rotates, it can apply a traction force to the I-beam body 6, thereby driving the I-beam body 6 to move in a straight line, ensuring that the subsequent welding positions of the I-beam body 6 can move steadily and make the welding uniform.

[0029] The side plate 7 is provided in two sets, and a pressing assembly capable of relative movement is provided between the two sets of side plates 7. The pressing assembly includes: The lifting frame 9 is slidably mounted on the side plate 7. Two sets of self-hinged connecting arms 15 are rotatably mounted on the lifting frame 9. Clamping rollers 16 are rotatably mounted at the ends of the connecting arms 15. The surface of the clamping rollers 16 forms an inner conical surface 1601. Specifically, the diameter of the inner conical surface gradually decreases from top to bottom. The side plate 7 is provided with a sliding groove 701, and the lifting frame 9 is slidably disposed in the sliding groove 701; A first electric telescopic rod 8 is also fixedly installed on the side plate 7, and the actuating end of the first electric telescopic rod 8 is connected to the lifting frame 9.

[0030] In this embodiment, the shafts of the two sets of connecting arms 15 are in a state of rotational connection, and the connection point between them is in a state of rotational connection with the lifting frame 9. This means that when the angle between the two sets of connecting arms 15 changes, the position of the clamping rollers 16 connected to the ends of the connecting arms 15 will also change accordingly. This allows the clamping rollers 16 located on both sides of the I-beam body 6 to move toward or away from the I-beam body 6, thereby realizing the squeezing, positioning, or release of the upper and lower wing plates of the I-beam body 6, ensuring the accuracy of the position of the two wing plates during movement, and improving the welding accuracy.

[0031] In the initial state, the clamping rollers 16 located on the left and right sides of the I-beam body 6 are far apart from each other, and the clamping rollers 16 located on the upper and lower sides of the I-beam body 6 are also vertically misaligned with the sides of the I-beam body 6. When controlling the clamping rollers 16 located on the left and right sides of the I-beam body 6 to move closer to each other to act on the upper and lower wing plates of the I-beam body 6, the first electric telescopic rod 8 is first controlled to move the clamping rollers 16 located on the upper and lower sides of the I-beam body 6 upward or downward. When there is an overlapping area between the two wing plates on the I-beam body 6 and the inner conical surface 1601, the angle between the two sets of connecting arms 15 is changed, thereby making the clamping rollers 16 located on the upper and lower sides of the I-beam body 6 move closer to each other to act on the upper and lower wing plates of the I-beam body 6. The clamping rollers 16 on the left and right sides of the body 6 can move closer to each other until the inner conical surface 1601 on the clamping roller 16 can act on the sides of the upper and lower sets of flanges of the I-beam body 6. Since the surface of the clamping roller 16 has an inner conical surface 1601, and the diameter of the inner conical surface 1601 gradually decreases from top to bottom, when the clamping roller 16 acts on the flange, it has a tendency to drive the flange towards the web, thereby ensuring the contact strength between the two sides of the web end and the two sets of flanges, so as to have a high welding quality in subsequent welding, and prevent the gaps of different sizes between the two sides of the web end and the flanges, which would cause process defects such as incomplete penetration, burn-through, porosity, undercut, and slag inclusion in subsequent welding.

[0032] In the prior art, the flange end of the I-beam body 6 is mainly pressed by a pressure member to make it fit tightly with the web. The production of the web mainly uses ion / flame cutting, which will produce burrs or slag on the edge of the web. Although the pressure of the pressure member can deform and compress the burrs and crush the slag, burrs and slag will still exist at the joint of the web and flange. At this time, the pressure of the pressure member alone cannot make the web and flange fit completely, resulting in process defects such as incomplete penetration, burn-through, porosity, undercut, and slag inclusion during welding. In this embodiment, the flange is not only pressed by the pressure member, but also by the clamping roller 16, so that the middle and both ends of the flange are subjected to forces toward the web, thereby ensuring the fit between the web end and the flange and improving the welding quality.

[0033] Please see Figures 2-5 The pressing assembly also includes two sets of bidirectional traction structures disposed on the lifting frame 9, the bidirectional traction structures connecting the ends of the two sets of connecting arms 15; The bidirectional traction structure includes a connecting plate 18 that slides on the lifting frame 9. Specifically, the lifting frame 9 is provided with a hysteresis groove 901, which is slidably connected to the connecting plate 18. A bidirectional lead screw 22 is rotatably mounted on the connecting plate 18, and the bidirectional lead screw 22 is threadedly connected to the threaded sleeve 23 that connects to the connecting arm 15. The bidirectional traction structure also includes a drive motor 19 fixedly installed on the connecting plate 18. A first gear 20 is connected to the output of the drive motor 19. The first gear 20 meshes with a second gear 21 connected to the bidirectional lead screw 22. The circumferential radius of the first gear 20 is smaller than the circumferential radius of the second gear 21.

[0034] In this embodiment, by controlling the operation of the drive motor 19, its output shaft can drive the first gear 20 connected to it to rotate. Under the meshing action of the first gear 20 and the second gear 21, the second gear 21 can drive the bidirectional lead screw 22 to rotate, thereby enabling the two sets of threaded sleeves 23 threadedly connected to the bidirectional lead screw 22 to move closer or further apart. When the two sets of threaded sleeves 23 move closer together, the ends of the two sets of connecting arms 15 can move closer together, causing the angle between the two sets of connecting arms 15 to change. During this process, the clamping rollers 16 on the left and right sides of the I-beam body 6 will move closer to the wing plate until they abut against the side of the wing plate, giving the sides of the wing plate a certain downward pressure and increasing the adhesion between the wing plate and the web plate.

[0035] In this embodiment, the axis of rotation of the threaded sleeve 23 is perpendicular to the bidirectional lead screw 22, and the axis of rotation of the threaded sleeve 23 is in a rotatable connection with the connecting arm 15.

[0036] Please see Figure 2 , Figure 3 , Figure 5 , Figure 6 The bracket 10 is rotatably connected to the lifting frame 9. Two sets of support members are fixed at the end of the bracket 10. The bracket 10 and the connecting arm 15 are connected by a constraint structure. The constraint structure enables the support members to be parallel to the axis of rotation of the two sets of clamping rollers 16 located on the same side of the I-beam body 6. The rotation axis of the bracket 10 and the lifting frame 9 is coaxial with the rotation axis of the connecting arm 15 and the lifting frame 9. The support includes a pressure plate 11 fixedly connected to the bracket 10. The pressure plate 11 has an "L" shaped structure and multiple sets of pressure rollers 12 rotate at equal intervals along its length direction. The constraint structure includes a horizontal shaft 13 that slides through the bracket 10. Two sets of connecting shafts 14 are rotatably mounted on one end of the horizontal shaft 13. The connecting shafts 14 are rotatably connected to the connecting positions 17 provided on the connecting arm 15.

[0037] In this embodiment, the rotatable connection between the bracket 10 and the lifting frame 9 is located in the middle of the bracket 10, and the rotatable connection between the two sets of connecting arms 15 is located in the middle of the connecting arms 15. This makes the distance between the middle of the two sets of support members and the pivot of the two sets of connecting arms 15 constant, that is, the middle of the two sets of support members can be located at half the length of the connecting arm 15. When the clamping roller 16 abuts against the ends of the wing plates of different widths, the middle of the two sets of clamping members can be located at half the width of the wing plate. During the welding and movement process, the web plate is located between the two sets of support members, so that the two sets of support members have the effect of automatically positioning the web plate, keeping the web plate at half the width of the wing plate, thereby ensuring the positional accuracy of the web plate relative to the wing plate during welding, and further improving the welding effect to a certain extent.

[0038] Furthermore, since the aforementioned pressure plate 11 has an "L"-shaped structure, the pressure roller 12 on the pressure plate 11 can not only guide and position the web plate, but also support the wing plate, thus ensuring that the web plate and the wing plate remain perpendicular. Based on the supporting effect of the pressure roller 12 on the wing plate, when the clamping roller 16 acts on the end of the wing plate and causes downward pressure on the end of the wing plate, even if the wing plate deforms, under the support of the pressure roller 12, the position of the wing plate near the middle will still be perpendicular to the web plate. This ensures that the web plate can remain perpendicular to the web plate while the wing plate has sufficient downward pressure on the web plate. This can prevent the wing plate from bending under pressure. Also, when the wing plate is separated from the clamping roller 16 after welding, the welding position will be stretched due to the reset deformation, causing structural damage to the welding position and resulting in a decrease in welding strength.

[0039] Furthermore, since the transverse shaft 13 and the bracket 10 are in a sliding connection state, and the transverse shaft 13 is connected to the connecting arm 15 through the connecting shaft 14, when the angles of the two sets of connecting arms 15 change to adapt to different widths of the wing plates, the transverse shaft 13 and the bracket 10 can both be located on the angle bisector of the two sets of connecting arms 15, so that the pressure plate 11 can be perpendicular to the angle bisector of the two sets of connecting arms 15. In this state, when the wing plate is slightly tilted in the horizontal direction relative to its original direction of movement, the angle of the pressure plate 11 can be adjusted accordingly, thus ensuring the relative position between the web plate and the wing plate. That is, the web plate is positioned by positioning the wing plate. The two are mechanically interlocked to ensure the accuracy of the relative position, further improving the welding quality.

[0040] Based on the above settings, firstly, the angle of the pressure plate 11 can change in real time with the movement direction of the wing plate, thereby adjusting the position of the web plate relative to the wing plate in real time and ensuring the accuracy of the relative position between the web plate and the wing plate. That is, the positioning of the web plate is achieved by positioning the wing plate, and the two are mechanically interlocked to ensure the accuracy of the relative position. Secondly, the middle part of the two sets of clamping parts is located at the half position in the width direction of the wing plate, so that the web plate can be maintained at the half position in the width direction of the wing plate, thereby ensuring the accuracy of the position of the web plate relative to the wing plate during welding. In addition, the clamping parts provide support for the wing plate, ensuring that the web plate and the wing plate remain perpendicular to each other. Under the condition that the wing plate has sufficient downward pressure on the web plate, the web plate can still remain perpendicular to the web plate. This can prevent the wing plate from bending under pressure. When the web plate is separated from the clamping roller 16 after welding, the welding position will be stretched due to the reset deformation, causing structural damage to the welding position and resulting in a decrease in welding strength.

[0041] Please see Figure 1 , Figures 7-9 The laser welding equipment for preventing deviation of I-beams further includes: a guide 25, a support shaft 30, a laser welding head 33, and an elastic clamping assembly.

[0042] The guide member 25 is fixedly installed on the beam 2, and a sliding plate 26 is slidably installed on the guide member 25. The sliding plate 26 is connected to the second electric telescopic rod 24 installed on the beam 2. The support shaft 30 and the sliding plate 26 are connected by an adjustment structure. The adjustment structure is used to adjust the distance between the support shaft 30 and the I-beam body 6. Specifically, the adjustment assembly includes a third electric telescopic rod 27 fixedly installed on the sliding plate 26 and a guide shaft 28 fixedly connected to the sliding plate 26. A guide sleeve 29 is slidably installed inside the guide shaft 28.

[0043] In this embodiment, the height of the sliding plate 26 can be adjusted by controlling the second electric telescopic rod 24 so that the height of the sliding plate 26 can be in the middle of the web. Then, the third electric telescopic rod 27 is controlled to move the guide sleeve 29 along the length of the guide shaft 28 to drive the laser welding head 33 to the predetermined position.

[0044] The laser welding head 33 is provided in four sets and is respectively arranged on both sides of the I-beam body 6. The laser welding head 33 is connected to the ejector pin 34. In order to reduce the friction between the ejector pin 34 and the web plate and the flange plate, a ball bearing can be provided at the end of the ejector pin 34.

[0045] The elastic clamping assembly connects the support shaft 30 and the laser welding head 33. The elastic clamping assembly enables the laser welding head 33 to be aligned with the welding position of the I-beam body 6. The elastic clamping assembly includes a guide plate 32 rotatably connected to the laser welding head 33 and a support shaft 30 connected to the guide sleeve 29. The guide plate 32 is provided with a sliding connection part 3202, which is slidably connected to the support shaft 30 and connected to a cylindrical spring 31 provided on the support shaft 30. The elastic clamping assembly also includes a convex shaft 3301 connected to the laser welding head 33, the convex shaft 3301 being able to slide within an arcuate groove 3201 provided on the guide plate 32.

[0046] During the movement of the guide sleeve 29 toward the web, the support shaft 30 can follow and move toward the web. In the initial state, the upper set of two sets of laser welding heads 33 on the support shaft 30 is tilted upward, and the lower set is tilted downward. When the two sets of laser welding heads 33 move toward the web, the ejector pin 34 on the lower laser welding head 33 is in contact with the lower flange. As the movement continues, when the ejector pin 34 on the upper laser welding head 33 acts on the web, the laser welding head 33 will deflect upward, so that when the laser welding head 33 is at the connection between the web and the flange, the lower laser welding head 33 is also at the connection between the web and the flange. Thus, when the I-beam body 6 moves, the laser welding head 33 can be used to perform welding operations on the web and flange.

[0047] It should be noted that the lower end of the aforementioned arc-shaped groove 3201 is higher than the height of the rotating connection between the laser welding head 33 and the guide plate 32, so that the upper laser welding head 33 can be in an upward tilted state in the initial state, so that when the ejector pin 34 connected to the set of laser welding heads 33 abuts against the web plate, the laser welding head 33 can deflect until the ejector pin 34 is at the connection between the web plate and the wing plate.

[0048] Furthermore, when the ejector pin 34 is at the connection between the web and the flange, the two sets of laser welding heads 33 are in a symmetrical state, and the end of the ejector pin 34 protrudes beyond the end of the laser welding head 33, so that the ejector pin 34 has the effect of guiding the laser welding head 33. In addition, when a slight deformation occurs at the edge of the web end, the ejector pin 34 can move along the deformation position and drive the laser welding head 33 to move, so that the position of the laser welding head 33 relative to the web and flange changes, preventing the existence of slight deformation from causing inconsistent distance between the laser welding head 33 and the welding position, resulting in fluctuations in the weld penetration / width during welding, accompanied by undercut, oxidation, and spatter.

[0049] Furthermore, when dealing with webs of different widths, by changing the deflection angle of the two sets of laser welding heads 33, the laser welding heads 33 can reach the welding position between the web and the flange. That is, when dealing with the webs of different types of I-beam bodies 6, this equipment can achieve effective welding operations within a certain range.

[0050] Based on the above settings, firstly, the ejector pin 34 guides the laser welding head 33, ensuring that it is stably positioned at the connection between the web and the flange. Secondly, when the edge of the web deforms, the ejector pin 34 drives the laser welding head 33 to change position accordingly, ensuring that the distance between the laser welding head 33 and the actual welding position remains consistent, thus avoiding fluctuations in weld penetration / width and preventing undercut, oxidation, and spatter. Furthermore, the two sets of laser welding heads 33 can be matched with webs of different widths by changing their deflection angle, making them applicable to welding different types of I-beam bodies 6 within a certain range.

[0051] As an embodiment of the present invention, a method for welding using the aforementioned anti-deviation laser welding equipment for I-beams is also proposed, comprising the following steps: Step 1: By controlling the action of the first electric telescopic rod 8, the two sets of pressing components move away from each other, and at the same time, the two sets of clamping rollers 16 located on both sides of the I-beam body 6 are kept at the maximum distance through the bidirectional traction structure. Step 2: Place the flange, web, and flange of the welded steel beam body 6 onto the support roller 4 in sequence, while simultaneously passing the web through the corresponding two sets of support members; Step 3: Reverse control of the first electric telescopic rod 8 and the bidirectional traction structure to make the clamping roller 16 abut against the side of the wing plate; Step 4: Control the second electric telescopic rod 24 to make the sliding plate 26 reach the predetermined height. Then, through the adjustment structure, drive the elastic clamping assembly and laser welding head 33 to move towards the web plate until the ejector pin 34 abuts against the right angle connection between the wing plate and the web plate. Step 5: Start the drive device 5 to pull the I-beam body 6, while the laser welding head 33 welds the unwelded flanges and webs.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A H-beam anti-deviation laser welding device, comprising: a base, a beam body is arranged on the base, a hydraulic cylinder is mounted on the beam body, and a pressing piece is arranged on the action end of the hydraulic cylinder; a plurality of support rollers are arranged along the length direction of the base; a driving device is arranged on the base, and the driving device is used for pulling the H-beam body after welding; characterized in that further comprising: two side plates are arranged, a pressing assembly capable of relative movement is arranged between the two side plates, the pressing assembly comprises: a lifting frame is slidingly mounted on the side plate, two self-hinged connecting arms are rotatably mounted on the lifting frame, and clamping rollers are rotatably mounted at the end of the connecting arms; a support is rotatably connected with the lifting frame, a support piece is fixedly arranged at the end of the support, and the support and the connecting arms are connected through a constraint structure, and the constraint structure can make the support piece parallel to the connecting line of the rotation shafts of the two clamping rollers on the same side of the H-beam body.

2. The laser welding device for I-beam according to claim 1, wherein, a sliding groove is arranged on the side plate, and the lifting frame is slidingly arranged in the sliding groove; a first electric telescopic rod is fixedly mounted on the side plate, and the action end of the first electric telescopic rod is connected with the lifting frame.

3. A laser beam welding apparatus for preventing offset of a H-beam according to claim 1, wherein the pressing assembly further comprises two bidirectional pulling structures arranged on the lifting frame, and the bidirectional pulling structures are connected with the ends of the two connecting arms; the bidirectional pulling structure comprises a connecting plate slidingly arranged on the lifting frame, a bidirectional screw rod is rotatably mounted on the connecting plate, and the bidirectional screw rod is threadedly connected with a threaded sleeve connected with the connecting arms.

4. A laser beam welding apparatus for H-beam steel according to claim 3, wherein the bidirectional pulling structure further comprises a driving motor fixedly mounted on the connecting plate, a first gear is connected with the output of the driving motor, and the first gear is engaged with a second gear connected with the bidirectional screw rod; the circumferential radius of the first gear is smaller than the circumferential radius of the second gear.

5. The laser welding device for H-beam steel according to claim 1, wherein, the rotation axis of the support and the lifting frame is coaxial with the rotation axis of the connecting arms and the lifting frame; the support piece comprises a pressing plate fixedly connected with the support, the pressing plate is in an "L" shape structure, and a plurality of pressing rollers are equidistantly rotatably arranged along the length direction of the pressing plate.

6. A laser beam welding apparatus for H-beam steel according to claim 1, wherein the constraint structure comprises a transverse shaft slidingly arranged through the support, two connecting shafts are rotatably mounted at one end of the transverse shaft, and the connecting shafts are rotatably connected with connecting positions arranged on the connecting arms.

7. The laser welding device for H-beam steel according to claim 1, wherein, the surface of the clamping roller is formed with an inner conical surface.

8. A laser beam welding apparatus for H-beam steel according to claim 1, wherein further comprising: a guide piece is fixedly mounted on the beam body, a sliding plate is slidingly mounted on the guide piece, and the sliding plate is connected with a second electric telescopic rod mounted on the beam body; a support shaft is connected with the sliding plate through an adjusting structure, and the adjusting structure is used for adjusting the distance between the support shaft and the H-beam body; four laser welding heads are arranged on both sides of the H-beam body, and a plunger is connected with each laser welding head. an elastic tightening assembly is connected with the support shaft and the laser welding head, and the elastic tightening assembly can make the laser welding head align with the welding position of the H-beam body.

9. A laser beam welding apparatus for preventing offset of a H-beam according to claim 8, wherein The elastic tightening assembly comprises a guide plate rotationally connected with the laser welding head and a supporting shaft connected with the adjusting structure, a sliding connection part is arranged on the guide plate, the sliding connection part is slidingly connected with the supporting shaft, and the sliding connection part is connected with a cylindrical spring arranged on the supporting shaft; The elastic tightening assembly further comprises a convex shaft connected with the laser welding head, and the convex shaft can slide in an arc-shaped groove arranged on the guide plate.

10. A method of welding using the beam offset prevention laser welding apparatus according to any one of claims 1 to 9, characterized by, The method comprises the following steps: Step one: by controlling the action of the first electric telescopic rod, the two groups of pressing and combining assemblies are moved away from each other, and at the same time, the two groups of clamping rollers located on both sides of the I-shaped steel beam body are kept at the maximum distance through the bidirectional pulling structure; Step two: the wing plates, the web plate and the wing plates welded to form the I-shaped steel beam body are sequentially placed on the supporting rollers, and at the same time, the web plate passes through the corresponding two groups of supporting pieces; Step three: the action of the first electric telescopic rod and the bidirectional pulling structure is reversely controlled, so that the clamping rollers abut against the side of the wing plate; Step four: the action of the second electric telescopic rod is controlled, so that the sliding plate reaches a predetermined height, and then the elastic tightening assembly and the laser welding head are driven by the adjusting structure to move towards the web plate until the ejector pin abuts against the right-angle connection between the wing plate and the web plate; Step five: the driving device is started, the I-shaped steel beam body is pulled, and at the same time, the laser welding head welds the unwelded wing plate and web plate.

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