Steel welding device and method for high-speed rail bridge construction

Abstract

The invention discloses a steel welding device and method for high-speed railway bridge construction, and relates to the technical field of laser welding, and the steel welding device comprises a machine base, a workpiece table, a stand column, a cross beam, a sliding seat, a laser welding head, a rotating part, a connecting pipe, a transition pipe, an air blowing pipe, a connecting part, a connecting plate, a supporting arm, a mounting ring, a rotating ring, an annular plate and a waveform blade. According to the welding device, the air blowing pipe can conduct rotary side blowing on the welding position of steel, air blowing blind areas are reduced, during side blowing, part of air impacts the wave-shaped blades, so that the wave-shaped blades can drive the rotating ring to rotate, and during rotating, rotation of the wave-shaped blades enables the inner side and the outer side of a ring hole of the rotating ring to generate a certain air pressure difference, so that the welding position of the steel is adjusted. Under the action of the air pressure difference, air in the inner hole area of the rotating ring flows in the direction away from the rotating ring, then plasma high-temperature air generated during welding can be made to be away from a laser welding head, and the influence of the plasma high-temperature air on the laser welding head is reduced.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, specifically to a welding device and method for steel used in the construction of high-speed railway bridges. Background Technology

[0002] Laser welding is a highly efficient and precise welding method that utilizes a high-energy-density laser beam as a heat source. It is a crucial application of laser materials processing technology. In the 1970s, it was primarily used for welding thin-walled materials and low-speed welding. The welding process is heat conduction type; the laser radiation heats the workpiece surface, and the surface heat diffuses inward through heat conduction. By controlling parameters such as the laser pulse width, energy, peak power, and repetition frequency, the workpiece melts, forming a specific molten pool. Due to its unique advantages, it has been successfully applied to the precision welding of micro and small parts.

[0003] During laser welding, a shielding gas is typically blown toward the welding position to reduce weld oxidation. Since plasma is generated during welding, blowing gas can reduce the influence of plasma on the laser. However, existing shielding gas blowing methods usually blow gas in a fixed direction, which creates a certain gas blowing blind zone. Therefore, it is necessary to improve the gas blowing method of existing laser welding equipment to reduce the gas blowing blind zone. Summary of the Invention

[0004] The purpose of this invention is to provide a steel welding device and method for high-speed railway bridge construction, 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 steel welding device for high-speed railway bridge construction, comprising a base for a laser welding machine, a workpiece table horizontally slidably connected to the base, columns on both sides of the base, a crossbeam horizontally connected to the upper ends of the two columns, a sliding seat horizontally slidably connected to the crossbeam, and a laser welding head provided on the sliding seat; and further comprising: The rotating part is coaxially and rotatably mounted on the laser welding head. A connecting tube is vertically and fixedly inserted through the end face of the rotating part. A transition tube is fixedly connected to the lower end of the connecting tube. An air blowing tube is provided at the end of the transition tube away from the connecting tube. A connecting part is fixedly sleeved on the connecting tube. A connecting plate is fixedly connected to the lower end of the connecting part. A support arm is connected to one end of the connecting plate. A mounting ring is fixedly connected to the support arm. The mounting ring is located below the laser welding head. A rotating ring is coaxially rotatably connected to the mounting ring hole. The lower end of the rotating ring is provided with two annular plates from top to bottom. The upper annular plate is coaxially fixed to the lower end face of the rotating ring. Multiple wave blades are fixedly connected between the two annular plates.

[0006] Through the above technical solution, the rotating part rotates, enabling the air blower to perform a rotating side-blowing motion on the welding position of the steel, reducing the air blower blind zone. Furthermore, the rotating ring and wave-shaped blades are incorporated. During side-blowing, some air impacts the wave-shaped blades, causing them to drive the rotating ring to rotate. This rotation creates a pressure difference between the inner and outer sides of the ring's hole. Under this pressure difference, the air in the inner area of ​​the rotating ring flows away from the ring, thus keeping the high-temperature plasma air generated during welding away from the laser welding head and reducing its impact. Additionally, as the rotating ring drives the ring plate to rotate, all the wave-shaped blades on the ring plate move synchronously, causing the pressure difference between the inner and outer sides of the ring's hole to become more uniform. This allows the high-temperature plasma air to be fully discharged, further reducing the air blower blind zone by allowing the high-temperature plasma air in the opposite direction of the air blower's direction to be discharged under the pressure difference.

[0007] Furthermore, the machine base is provided with a translation mechanism, which is used to drive the workpiece table to move horizontally and linearly.

[0008] The above technical solution uses a translation mechanism to move the worktable to transport the steel material to the area below the laser welding head.

[0009] Furthermore, a motor plate is fixedly sleeved around the periphery of the laser welding head, a motor is mounted on the motor plate, the motor shaft of the motor is driven by a drive gear, and a gear part is provided around the periphery of the rotating part, the gear part being externally meshed with the drive gear.

[0010] Through the above technical solution, the motor shaft of the motor rotates, causing the drive gear to rotate, and then the drive gear and the gear unit mesh and drive the rotating part to rotate.

[0011] Furthermore, a lower baffle is fixedly sleeved on the upper end of the connecting tube. The lower baffle is coaxially and slidably sleeved on the periphery of the laser welding head. A fixing chamber is fixedly sleeved on the periphery of the laser welding head. The lower side of the fixing chamber is open and slides in contact with the top surface of the lower baffle. An air pipe interface is provided at the top of the fixing chamber, and the air pipe interface communicates with the inner cavity of the fixing chamber.

[0012] With the above technical solution, the top surface of the lower baffle slides in contact with the lower surface of the fixed chamber, so that the external inert gas delivery system delivers the inert gas to the gas pipe interface, and then enters the inner cavity of the fixed chamber through the gas pipe interface. The inert gas will enter the connecting pipe from the inner cavity of the fixed chamber. When the rotating part rotates, it is subjected to the abutment between the top surface of the lower baffle and the lower surface of the fixed chamber, so that the inert gas will not leak out in the inner cavity of the fixed chamber.

[0013] Furthermore, the support arm is horizontally fixed with a sliding rod, one end of which slides through the connecting plate. The connecting plate is provided with an elastic reset unit, which imparts potential energy to the support arm to move toward the side adjacent to the connecting pipe. The rotating ring is provided with a reciprocating swing unit, which drives the rotating ring to reciprocate linearly away from the connecting plate when the rotating ring rotates.

[0014] Through the above technical solution, when the rotating ring rotates, it will trigger the reciprocating oscillating unit to move, thereby causing the rotating ring to move linearly back and forth. This causes the rotating ring to drive the wave-shaped blades to move, thereby enabling the wave-shaped blades to discharge high-temperature plasma air over a larger area.

[0015] Furthermore, the elastic reset unit includes a nut sleeved on one end of the sliding rod that extends out of the connecting plate, and a reset spring is wrapped around the periphery of the sliding rod. The two ends of the reset spring in the direction of its elastic force are respectively fixed to the support arm and the connecting plate.

[0016] Through the above technical solution, the reset spring generates tension on the support arm, so that when the support arm is subjected to tension, it will generate potential energy to move towards the connecting plate.

[0017] Furthermore, the reciprocating swing unit includes a fixed column horizontally fixed to the connecting plate, a first ball being rotatably embedded at the end of the fixed column, a fixed ring being fixedly fitted around the periphery of the rotating ring, and a plurality of first protrusions being fixedly connected around the periphery of the fixed ring, the first ball cooperating with the first protrusions.

[0018] Through the above technical solution, when the rotating ring rotates, it is subjected to the pulling force of the elastic reset unit, which causes the first ball to roll alternately on the periphery of the fixed ring and the surface of the first protrusion, thereby enabling the rotating ring to generate reciprocating motion in the direction away from the connecting plate.

[0019] Furthermore, a connecting arm is fixedly connected to the lower end of the transition tube, and a short shaft is fixedly connected to the periphery of the air blowing tube. The short shaft is rotatably inserted through the connecting arm. The air blowing tube is connected to the transition tube through a flexible hose. The rotating ring is provided with an air blowing angle adjustment unit. The air blowing angle adjustment unit is used to adjust the blowing angle of the air blowing tube when the rotating ring rotates and moves horizontally linearly.

[0020] With the above technical solution, as the rotating ring moves away from the connecting plate, the impact force of the inert gas blown out by the air blow pipe on the corrugated blades will decrease, which may cause the rotation speed of the rotating ring driven by the corrugated blades to decrease, resulting in a decrease in the exhaust effect of the high-temperature air from the plasma. Therefore, by setting the air blowing angle adjustment unit, the blowing angle of the air blow pipe is adjusted when the rotating ring moves away from the connecting plate, so that the impact force of the inert gas on the corrugated blades does not decrease too much, thereby affecting the rotation speed of the rotating ring and thus affecting the exhaust effect of the high-temperature air from the plasma.

[0021] Furthermore, the air blowing angle adjustment unit includes a fixing pin fixed to the periphery of the air blowing pipe, a second ball is rotatably embedded at the lower end of the fixing pin, a plurality of second protrusions are fixed to the upper end face of the rotating ring, the second ball and the second protrusions are used in conjunction, the connecting arm is provided with a receiving groove, a spiral spring is installed in the receiving groove, the inner ring of the spiral spring is fixedly wrapped around the short shaft, and the outer ring end is fixed to the inner wall of the receiving groove.

[0022] With the above technical solution, when the rotating ring rotates, the second protrusion will intermittently contact the second ball, so that the air blowing pipe is subjected to the squeezing force of the second protrusion on the second ball, thereby causing the air blowing pipe to rotate upward along the hinge with the connecting arm, so that the air blowing angle of the air blowing pipe can be adjusted.

[0023] A method for welding steel for high-speed railway bridge construction, applied to the welding apparatus described above, includes: The steel required for the construction of the high-speed railway bridge is placed on the workpiece table. The workpiece table drives the steel to move to the bottom of the laser welding head. An external inert gas delivery system delivers inert gas to the connecting pipe, and then blows it onto the surface of the steel in sequence through the connecting pipe, transition pipe, and air blowing pipe. When the laser welding head is energized, it welds the steel, forming a molten pool on the steel surface. The sliding seat moves, which in turn moves the laser welding head to weld the steel. During the welding process, inert gas is blown onto the steel surface, while the rotating part rotates along the axis of the laser welding head, which causes the inert gas to be blown onto the steel surface in a rotating manner. During side blowing, inert gas is blown toward the steel surface at a certain angle, causing part of the airflow to be blown toward the corrugated blades. This causes the corrugated blades to rotate the mounting ring. As the corrugated blades rotate, the air in the mounting ring hole flows toward the outside of the mounting ring, which in turn causes the high-temperature plasma air generated during welding to move away from the welding position.

[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the rotating part rotates, enabling the air blower to perform a rotating side-blowing motion on the welding position of the steel, reducing the air blower blind zone. Furthermore, a rotating ring and wave-shaped blades are incorporated. During side-blowing, some air impacts the wave-shaped blades, causing them to drive the rotating ring to rotate. This rotation creates a pressure difference between the inner and outer sides of the rotating ring's hole. Under this pressure difference, the air in the inner hole area of ​​the rotating ring flows away from the rotating ring, thus keeping the high-temperature plasma air generated during welding away from the laser welding head and reducing the plasma's influence on the laser welding head. Additionally, as the rotating ring drives the annular plate to rotate, all the wave-shaped blades on the annular plate move synchronously, causing the pressure difference between the inner and outer sides of the rotating ring's hole to become more uniform. This allows the high-temperature plasma air to be fully discharged, further reducing the air blower blind zone by allowing the high-temperature plasma air in the opposite direction of the air blower's blowing direction to be discharged under the pressure difference. 2. In this invention, when the rotating ring rotates, it will trigger the action of the reciprocating swing unit, thereby causing the rotating ring to move linearly back and forth. This causes the rotating ring to drive the wave blades to move, thereby enabling the wave blades to discharge high-temperature plasma air over a larger area. 3. In this invention, as the rotating ring moves away from the connecting plate, the impact force of the inert gas blown out by the air blow pipe on the corrugated blades will decrease, which may cause the rotation speed of the rotating ring driven by the corrugated blades to decrease, resulting in a decrease in the exhaust effect of the high-temperature air from the plasma. Therefore, by setting the air blowing angle adjustment unit, the blowing angle of the air blow pipe is adjusted when the rotating ring moves away from the connecting plate, so that the impact force of the inert gas on the corrugated blades does not decrease too much, thereby affecting the rotation speed of the rotating ring and thus affecting the exhaust effect of the high-temperature air from the plasma. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a steel welding device for high-speed railway bridge construction according to the present invention; Figure 2 for Figure 1 A diagram illustrating the positional relationship from another perspective; Figure 3 This is a schematic diagram showing the positional relationship between the laser welding head, the rotating part, and the connecting tube after assembly in this invention; Figure 4 for Figure 3 Enlarged schematic diagram of the local structure at point A; Figure 5 for Figure 3 A diagram illustrating the positional relationships from a first-person perspective. Figure 6 for Figure 3A diagram illustrating the positional relationships from a second-person perspective; Figure 7 for Figure 6 Enlarged schematic diagram of the local structure at point B; Figure 8 This is a schematic diagram showing the positional relationship of the rotating part, the lower baffle, and the fixed compartment after assembly in this invention; Figure 9 This is a schematic diagram showing the positional relationship of the rotating ring, wave blades, and annular plate after assembly in this invention; Figure 10 for Figure 9 A schematic diagram showing the positional relationship of the middle section after it has been cut open.

[0026] The following are the annotations for each item in the figure: 1. Base; 2. Translation mechanism; 3. Workpiece table; 4. Column; 5. Crossbeam; 6. Laser welding head; 7. Sliding seat; 8. Fixed chamber; 9. Rotating part; 10. Connecting pipe; 11. Rotating ring; 12. Annular plate; 13. Waveform blade; 14. Fixed ring; 15. Connecting plate; 16. Transition pipe; 17. Connecting part; 18. Lower baffle; 19. Drive gear; 20. Motor plate; 21. Motor; 22. Air pipe interface; 23. Mounting ring; 24. Second protrusion; 25. Air blow pipe; 26. Connecting arm; 27. Scroll spring; 28. Fixed column; 29. ​​Vertical plate; 30. Nut; 31. Sliding rod; 32. Return spring; 33. Support arm; 34. First protrusion; 35. First ball bearing; 36. Fixing pin; 37. Second ball bearing. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-10This invention provides a technical solution: a steel welding device for high-speed railway bridge construction, including a base 1 of a laser welding machine. A workpiece table 3 is horizontally slidably connected to the top of the base 1 via a mounting rail and a slider. Multiple clamps for fixing steel can be installed on the workpiece table 3. Columns 4 are installed on both sides of the base 1 in the width direction. A crossbeam 5 is horizontally installed at the upper end of the two columns 4. A sliding seat 7 is horizontally slidably connected to the side wall of the crossbeam 5 via a mounting rail and a slider. A welding seat is vertically slidably connected to the sliding seat 7 via a mounting rail and a slider. A laser welding head 6 is installed on the welding seat. The base 1 is provided with a translation mechanism 2 for driving the workpiece table 3 to move horizontally on the base 1. The crossbeam 5 is provided with a first driving mechanism for driving the sliding seat 7 to move horizontally. The sliding seat 7 is provided with a second driving mechanism for driving the welding seat to move vertically. In this embodiment, the translation mechanism 2, the first driving mechanism, and the second driving mechanism are all transmission devices composed of a servo motor and a ball screw pair. In addition, the movement directions of the workpiece table 3 and the sliding seat 7 are orthogonal. A rotating part 9 is rotatably sleeved on the periphery of the laser welding head 6, and the rotating part 9 is coaxial with the laser welding head 6. A connecting tube 10 is vertically fixedly inserted through the end face of the rotating part 9. A transition tube 16 is fixedly connected to the lower end of the connecting tube 10. The axial direction of the transition tube 16 is at an angle to the axial direction of the laser welding head 6, that is, the transition tube 16 is inclined. The upper end of the connecting tube 10 extends out of the upper end face of the rotating part 9. A motor plate 20 is fixedly sleeved on the periphery of the laser welding head 6. A motor 21 is mounted on the motor plate 20. The motor shaft of the motor 21 is driven by a drive gear 19. A gear part is provided on the periphery of the rotating part 9. The gear part is externally meshed with the drive gear 19, so that when the motor 21 drives the drive gear 19 to rotate, the meshing of the drive gear 19 and the gear part causes the gear part to drive the rotating part 9 to rotate. A lower baffle 18 is fixedly sleeved on the upper end of the connecting pipe 10. The lower baffle 18 is coaxially and slidably sleeved on the periphery of the laser welding head 6. A fixed chamber 8 is fixedly sleeved on the periphery of the laser welding head 6. The lower side of the fixed chamber 8 is open and slides in contact with the top surface of the lower baffle 18. The top of the fixed chamber 8 is provided with an air pipe interface 22. The air pipe interface 22 is connected to the inner cavity of the fixed chamber 8. The air pipe interface 22 is connected to an external inert gas delivery system through a pipeline. Two connecting arms 26 are fixedly connected to the lower periphery of the transition pipe 16. The two connecting arms 26 are symmetrically arranged along the axial direction of the transition pipe 16. The other two connecting arms 26 are horizontally and rotatably provided with short shafts. The opposite ends of the two short shafts are fixedly connected to an air blowing pipe 25. The air blowing pipe 25 is connected to the transition pipe 16 through a flexible hose. The external inert gas delivery system delivers inert gas to the air pipe interface 22, which then enters the inner cavity of the fixed chamber 8 and then enters the connecting pipe 10. A connecting part 17 is fixedly sleeved around the periphery of the connecting pipe 10. The connecting part 17 is a tubular structure with an open periphery. A connecting plate 15 is fixedly connected to the lower end of the connecting part 17. The connecting plate 15 is composed of a horizontal plate and a vertical plate 29. Two sliding rods 31 are horizontally slidably mounted on the vertical plate 29 of the connecting plate 15. The ends of the sliding rods 31 away from the vertical plate 29 are connected to a support arm 33. Nuts 30 are installed on the other ends of the sliding rods 31. Nuts 30 are used to limit the movement of the sliding rods 31 away from the connecting plate 15. A mounting ring 23 is fixedly connected to the support arm 33. The mounting ring 23 is located below the laser welding head 6. A rotating ring 11 is coaxially rotatably connected to the ring hole of the mounting ring 23 through a mounting bearing. Two annular plates 12 are provided at the lower end of the rotating ring 11 from top to bottom. The upper annular plate 12 is coaxially fixed to the lower end face of the rotating ring 11. Multiple wave blades 13 are fixedly connected between the two annular plates 12. The wave blades 13 are in a vertical state, and the multiple wave blades 13 are arranged in an array along the axial direction of the annular plate 12. A return spring 32 is wrapped around the periphery of the sliding rod 31. The two ends of the return spring 32 are fixed to the support arm 33 and the connecting plate 15 respectively in the direction of its elastic force. A fixing post 28 is horizontally fixed to the vertical plate 29 of the connecting plate 15. A first ball bearing 35 is rotatably embedded at the end of the fixing post 28. A fixing ring 14 is fixedly fitted around the periphery of the rotating ring 11. Multiple first protrusions 34 are fixed around the periphery of the fixing ring 14. The first ball bearing 35 cooperates with the first protrusions 34; that is, when the rotating ring 11 rotates, the first ball bearing 35 will alternately roll on the surface of the first protrusions 34 and around the periphery of the fixing ring 14. A fixing pin 36 is fixed around the periphery of the air blowpipe 25. The lower end of the 36 is fitted with a second ball bearing 37 that rotates. The upper end face of the rotating ring 11 is fixed with a plurality of second protrusions 24. The second ball bearing 37 is used in conjunction with the second protrusions 24. The connecting arm 26 has a receiving groove. A spiral spring 27 is installed in the receiving groove. The inner ring of the spiral spring 27 is fixedly wrapped around the short shaft, and the outer ring end is fixed to the inner wall of the receiving groove. In the natural state, the elastic potential energy of the spiral spring 27 is released, causing the air blow pipe 25 to swing downward naturally, and causing the second ball bearing 37 to roll in contact with the end face of the rotating ring 11 or the surface of the second protrusions 24. In addition, the thickness of the end face of the rotating ring 11 is greater than the horizontal movement stroke of the rotating ring 11.

[0029] Working principle of the invention: The steel required for the construction of the high-speed railway bridge is placed on the workpiece platform 3. The workpiece platform 3 drives the steel to move to the bottom of the laser welding head 6. The external control cabinet is started, and the laser welding head 6 is put into operation. At the same time, the external inert gas delivery system delivers inert gas to the gas pipe interface 22, and then enters the inner cavity of the fixed chamber 8 through the gas pipe interface 22. Then, it enters the connecting pipe 10 through the inner cavity of the fixed chamber 8, and then blows the gas to the welding position of the steel in sequence through the connecting pipe 10, the transition pipe 16, and the air blowing pipe 25. The first and second driving mechanisms are activated to drive the laser welding head 6 to weld the steel along a preset trajectory, forming a molten pool on the steel surface. When the inert gas is blown onto the steel surface, it will also blow towards the molten pool. Since the inert gas is blown at an inclined angle, some of the inert gas will be blown towards the wave blade 13, causing the wave blade 13 to rotate under the impact of the airflow, and enabling the rotating ring 11 to rotate. Motor 21 drives drive gear 19 to rotate, which in turn drives rotating part 9 to rotate, thereby enabling air blowing pipe 25 to rotate and blow sideways, reducing air blowing blind spots. When rotating ring 11 rotates, the first ball 35 will alternately roll and contact the first protrusion 34 and the periphery of fixed ring 14. Combined with the pulling force of return spring 32 on support arm 33, rotating ring 11 will move away from connecting plate 15 under the squeezing force of first ball 35 on first protrusion 34. When the first ball 35 rolls and contacts the periphery of fixed ring 14, return spring 32 will drive support arm 33 to move in the opposite direction. Thus, during the rotation of rotating ring 11, reciprocating horizontal linear movement will be generated. Furthermore, when the rotating ring 11 rotates, the second ball 37 will alternately roll on the upper end face of the rotating ring 11 and the upper surface of the second protrusion 24. Combined with the torque of the spiral spring 27 on the short shaft, when the second ball 37 contacts the upper surface of the second protrusion 24, the second protrusion 24 exerts an upward squeezing force on the second ball 37. This causes the second ball 37 to drive the air blow pipe 25 to swing upward, changing the blowing angle of the air blow pipe 25. As the rotating ring 11 moves away from the connecting plate 15, the blowing angle of the air blow pipe 25 decreases, thus allowing sufficient air to impact the wave-shaped blade 13. This prevents the rotational speed of the wave-shaped blade 13 from decreasing too much, which would affect the discharge effect of the high-temperature air from the plasma.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel welding device for high-speed railway bridge construction, comprising a base (1) of a laser welding machine, wherein a workpiece table (3) is horizontally slidably connected to the base (1), and columns (4) are provided on both sides of the base (1). A crossbeam (5) is horizontally connected to the upper ends of the two columns (4), and a sliding seat (7) is horizontally slidably connected to the crossbeam (5). A laser welding head (6) is provided on the sliding seat (7). The device is characterized in that... Also include: The rotating part (9) is coaxially sleeved on the laser welding head (6), and the end surface of the rotating part (9) is vertically fixedly penetrated by a connecting pipe (10), the lower end of the connecting pipe (10) is fixedly connected with a transition pipe (16), and the transition pipe (16) is provided with a blowing pipe (25) away from the one end of the connecting pipe (10); The connecting part (17) is fixedly sleeved on the connecting pipe (10), the lower end of the connecting part (17) is fixedly connected with a connecting plate (15), one end of the connecting plate (15) is connected with a support arm (33), the support arm (33) is fixedly connected with a mounting ring (23), and the mounting ring (23) is located below the laser welding head (6); The rotating ring (11) is coaxially connected to the ring hole of the mounting ring (23), and the rotating ring (11) is provided with two annular plates (12) from top to bottom at the lower end, one of the annular plates (12) is coaxially fixedly connected to the lower end surface of the rotating ring (11), and a plurality of wave-shaped blades (13) are fixedly connected between the two annular plates (12).

2. The steel welding device for high-speed railway bridge construction according to claim 1, characterized in that, The machine base (1) is provided with a translation mechanism (2), and the translation mechanism (2) is used for driving the workpiece table (3) to move linearly horizontally.

3. The steel welding device for high-speed railway bridge construction according to claim 1, characterized in that, The laser welding head (6) is fixedly sleeved with a motor plate (20) around the circumference, the motor plate (20) is provided with a motor (21), the motor shaft of the motor (21) is drivingly connected with a driving gear (19), the rotating part (9) is provided with a gear part around the circumference, and the gear part is in external meshing state with the driving gear (19).

4. The steel welding device for high-speed railway bridge construction according to claim 1, characterized in that, The lower end of the connecting pipe (10) is fixedly sleeved with a lower baffle (18), the lower baffle (18) is coaxially and slidingly sleeved on the circumference of the laser welding head (6), the circumference of the laser welding head (6) is fixedly sleeved with a fixed bin (8), the side of the fixed bin (8) facing downward is open and in sliding contact with the top surface of the lower baffle (18), the top of the fixed bin (8) is provided with a gas pipe interface (22), and the gas pipe interface (22) is in communication with the inner cavity of the fixed bin (8).

5. The steel welding device for high-speed railway bridge construction according to claim 1, characterized in that The support arm (33) is fixedly penetrated by a sliding rod (31) horizontally, one end of the sliding rod (31) slidingly penetrates out of the connecting plate (15), the connecting plate (15) is provided with an elastic reset unit, the elastic reset unit gives the support arm (33) potential energy moving towards the side adjacent to the connecting pipe (10), and the rotating ring (11) is provided with a reciprocating swing unit.

6. The steel welding device for high-speed railway bridge construction according to claim 5, characterized in that, The elastic reset unit includes a nut (30) sleeved on one end of the sliding rod (31) penetrating out of the connecting plate (15), the sliding rod (31) is sleeved with a reset tension spring (32) around the circumference, and the reset tension spring (32) is fixedly connected to the support arm (33) and the connecting plate (15) at both ends of the elastic force direction, respectively.

7. The steel welding device for high-speed railway bridge construction according to claim 5, characterized in that, The reciprocating swing unit comprises a fixed column (28) fixed horizontally to the connecting plate (15), the first ball (35) is rotatably embedded at the end of the fixed column (28), the fixed ring (14) is fixedly sleeved at the circumference of the rotating ring (11), the first protruding part (34) is fixedly connected to the circumference of the fixed ring (14), and the first ball (35) is used in cooperation with the first protruding part (34).

8. The steel welding device for high-speed railway bridge construction according to claim 1, characterized in that, The lower end of the transition pipe (16) is fixedly connected with the connecting arm (26), the short shaft is fixedly connected to the circumference of the air blowing pipe (25), the short shaft is rotatably penetrated in the connecting arm (26), the air blowing pipe (25) is connected with the transition pipe (16) through the hose, the rotating ring (11) is provided with an air blowing angle adjusting unit, and the air blowing angle adjusting unit is used for adjusting the blowing angle of the air blowing pipe (25) when the rotating ring (11) rotates and linearly moves horizontally.

9. The steel welding device for high-speed railway bridge construction according to claim 8, characterized in that, The air blowing angle adjusting unit comprises a fixed pin (36) fixedly connected to the circumference of the air blowing pipe (25), the second ball (37) is rotatably embedded at the lower end of the fixed pin (36), the second protruding part (24) is fixedly connected to the upper end surface of the rotating ring (11), the second ball (37) is used in cooperation with the second protruding part (24), the connecting arm (26) is provided with a containing groove, the volute spring (27) is installed in the containing groove, the inner ring of the volute spring (27) is fixedly sleeved on the short shaft, and the outer ring end is fixedly connected to the inner wall of the containing groove.

10. A steel material welding method for high-speed railway bridge construction, applied to the welding device according to any one of claims 1 to 9, characterized in that, Comprise: The steel material required for high-speed railway bridge construction is placed on the workpiece table (3), the workpiece table (3) drives the steel material to move below the laser welding head (6), the external inert gas conveying system conveys inert gas to the connecting pipe (10), and then the inert gas is blown to the surface of the steel material in sequence through the connecting pipe (10), the transition pipe (16) and the air blowing pipe (25); The laser welding head (6) is energized and welded to the steel material, so that a molten pool is formed on the surface of the steel material, the sliding seat (7) moves, thereby driving the laser welding head (6) to move to weld the steel material, during the welding process, the inert gas is blown to the surface of the steel material, and the rotating part (9) rotates along the axial direction of the laser welding head (6), thereby making the inert gas rotate and blow to the surface of the steel material; When the inert gas is blown to the surface of the steel material at a certain angle, part of the airflow is blown to the wave-shaped blade (13), thereby making the wave-shaped blade (13) drive the mounting ring (23) to rotate, when the wave-shaped blade (13) rotates, the air in the ring hole of the mounting ring (23) flows to the outside of the mounting ring (23), thereby enabling the high-temperature plasma generated during welding to move away from the welding position.

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