Electron beam welding device for building square tube

Abstract

The invention discloses an electron beam welding device for building square tubes, and belongs to the technical field of welding. Symmetrical fixing seats are fixedly arranged at the top of an operation table, and a semi-cylindrical rotating inner barrel is rotationally arranged in a rotating outer barrel; a sliding frame is slidably mounted in the clamping cavity, and a plurality of groups of roll shafts are movably mounted in the sliding frame; a clamping plate for fixing a square tube to be welded is fixedly arranged on the inner side of the connecting rod, and an outer magnetic plate is fixedly arranged on the outer side of the connecting rod; a lifting frame is fixedly arranged at the output end of the swing air cylinder, welding rails arranged outside the to-be-welded square pipe in a sleeving mode are fixedly arranged on the two sides of the lifting frame, and welding equipment capable of being adjusted in multiple directions is installed at the bottom of the moving frame. A square pipe is conveniently positioned through the sliding frame and the notch, a welded finished product is rapidly discharged, when the lifting frame drives the rotating inner cylinder and the rotating outer cylinder to deflect, the welding rail and welding equipment can synchronously descend, so that a notch is always located in the center of the welding rail, and the welding effect is improved through the design.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and specifically to an electron beam welding device for building square pipes. Background Art

[0002] Square pipes are a common building material, named for their rectangular shape. Square pipes are light, high-strength, corrosion-resistant, etc., and thus have a wide range of applications in construction. Square pipes can be made into various shapes, such as lattice, railings, etc. through cutting, welding, etc. for building decoration. Laser welding is an efficient and precise welding method that uses a laser beam with a high energy density as a heat source. Laser welding is an important aspect of the application of laser material processing technology. During the laser welding process, the laser beam is focused on the surface of the workpiece, and the surface of the workpiece is heated to melting through heat conduction to form a specific molten pool, which finally solidifies into a weld seam. Laser welding has the characteristics of low heat input, small welding deformation, and not being affected by the electromagnetic field.

[0003] Chinese Patent Application with Publication No. CN118287804A discloses an electron beam welding device for seam welding of vehicle shock absorbers, which relates to the technical field of welding equipment, and solves the problems that during the seam welding operation of vehicle shock absorbers, the generated heat is likely to cause damage to the hands of workers, is not safe enough, and affects the seam welding efficiency. The electron beam welding device includes an equipment box, a shock absorber positioning and rotating mechanism, an electron beam seam welding assembly, and an integrated console. One side of the top of the equipment box is provided with a shock absorber positioning and rotating mechanism, and a vehicle shock absorber body is grasped and fixed on the side of the shock absorber positioning and rotating mechanism. The bottom of the vehicle shock absorber body is installed on the side of a support assembly, and the support assembly is installed on the other side of the top of the equipment box by screws; in this invention, the vehicle shock absorber rotates evenly, and while realizing the seam welding operation of the vehicle shock absorber, it will automatically perform air-cooling heat dissipation treatment on the vehicle shock absorber in the seam welding state, improving the efficiency of the vehicle shock absorber during seam welding processing.

[0004] However, the processing efficiency and automation degree of the above-disclosed electron beam welding device are average. It cannot perform welding processing on multiple groups of raw materials synchronously, and its degree of freedom is average. When in use, it cannot freely adjust the clamping angle and welding angle of the parts on both sides according to actual needs, so as to meet the welding of various different specifications of cuts. Summary of the Invention

[0005] The purpose of the present invention is to provide an electron beam welding device for building square pipes in order to solve the problems in the prior art that the processing efficiency and automation degree of the electron beam welding device are average, it cannot perform welding processing on multiple groups of raw materials synchronously, and its degree of freedom is average. When in use, it cannot freely adjust the clamping angle and welding angle of the parts on both sides according to actual needs, so as to meet the welding of various different specifications of cuts.

[0006] To achieve the above object, the technical solution of the present invention is: an electron beam welding device for building square tubes, including an operation table, symmetric fixing seats are fixedly arranged on the top of the operation table, symmetric rotating outer cylinders are swingably installed on the top of the fixing seats, and a semi-cylindrical rotating inner cylinder is rotatably arranged inside the rotating outer cylinders; a clamping cavity is formed in the middle of the rotating inner cylinder, a sliding frame is slidably installed in the clamping cavity, and multiple groups of roller shafts are movably installed inside the sliding frame; a connecting rod is movably installed on the inner wall of the rotating inner cylinder, a clamping plate for fixing the square tube to be welded is fixedly arranged on the inner side of the connecting rod, and an outer magnetic plate is fixedly arranged on the outer side of the connecting rod; a swing cylinder is further installed on the top of the operation table, a lifting frame is fixedly arranged at the output end of the swing cylinder, welding rails sleeved outside the square tube to be welded are fixedly arranged on both sides of the lifting frame, a moving frame is movably installed on the welding rails, and a welding device capable of multi-directional adjustment is installed at the bottom of the moving frame; when the rotating outer cylinders swing inward, welding operations can be performed on the square tubes with cutouts.

[0007] As a further scheme of the present invention: a swing shaft is fixedly arranged between the two rotating outer cylinders, and a swing hoop cooperating with the swing shaft is fixedly arranged on the top of the fixing seat; a swing fan is installed in the middle of the swing shaft, and a toothed plate meshing with the swing fan is installed on both sides of the lifting frame.

[0008] As a further scheme of the present invention: a traveling gear ring is installed on the inner wall of the welding rail, a traveling motor is installed on the outer wall of the moving frame, a welding cylinder is installed at the bottom of the moving frame, and the welding device is installed at the output end of the welding cylinder.

[0009] As a further scheme of the present invention: a control panel is further arranged on the operation table, and collection boxes located below the welding rails are arranged on both sides of the operation table.

[0010] As a further scheme of the present invention: a limiting rail is fixedly arranged on the inner wall of the rotating outer cylinder, a limiting groove cooperating with the limiting rail is formed on the outer wall of the rotating inner cylinder, and a notch facilitating material taking is formed on the top of the rotating outer cylinder.

[0011] As a further scheme of the present invention: symmetric sliders are arranged on the outer walls on both sides of the sliding frame, sliding grooves cooperating with the sliders are formed on the inner walls on both sides of the clamping cavity, and a handle is further arranged on the outer wall of the sliding frame.

[0012] As a further solution of the present invention: a first storage cavity is formed on the inner wall of the rotating inner cylinder, a second storage cavity is formed on the outer wall of the rotating inner cylinder, a through hole is formed between the first storage cavity and the second storage cavity, the connecting rod is movably arranged in the through hole, a plurality of reset springs are connected to the inner wall of the clamping plate, and the bottom of the reset spring is connected to the inner wall of the first storage cavity.

[0013] As a further solution of the present invention: an installation frame is fixedly arranged at the bottom of the rotating outer cylinder, a locking cylinder is installed inside the installation frame, and an inner magnetic plate matched with the outer magnetic plate is installed at the output end of the locking cylinder.

[0014] As a further solution of the present invention: a flipping gear ring is fixedly installed on the outer wall of the rotating inner cylinder, a flipping motor is further installed on the installation frame, and a driving gear meshing with the flipping gear ring is installed at the output end of the flipping motor.

[0015] As a further solution of the present invention: the angle of the notch is less than 180 degrees.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can perform welding processing on square tubes with different types of cuts through the swingable rotating outer cylinder and rotating inner cylinder. When the cuts on both sides of the square tube are perpendicular, at this time, under the conveying of the sliding frames on both sides, the cuts on both sides of the square tube are abutted. At this time, under the cooperation of the driving gear and the flipping gear ring, the rotating inner cylinder rotates freely relative to the rotating outer cylinder and cooperates with the welding equipment on the welding track to perform all-round welding on the cut. When the cut of the square tube is in an inclined state, first align the cuts of the square tubes on both sides, and then drive the lifting frame to move downward through the swing cylinder. At this time, under the cooperation of the toothed plate and the swing fan, the rotating inner cylinders and rotating outer cylinders on both sides deflect inward. At this time, the cuts of the square tube are attached, and then the rotating inner cylinder and the rotating outer cylinder are fixed and the welding equipment is driven to move along the welding track to perform all-round welding on the cut. This design improves the freedom degree of the electron beam welding device for building square tubes.

[0018] 2. The present invention can facilitate the rapid positioning of the square tube and the rapid blanking of the finished product after welding through the design of the sliding frame and the notch. When the lifting frame drives the rotating inner cylinders and rotating outer cylinders on both sides to deflect, the welding tracks and welding equipment on both sides will also be lifted or lowered synchronously, so that the cut is always located at the center position of the welding track. This design improves the welding effect of the electron beam welding device for building square tubes. Description of the Drawings

[0019] The present invention will be further explained below with reference to the drawings and embodiments:

[0020] Figure 1It is the three-dimensional structure diagram of the present invention;

[0021] Figure 2 It is the three-dimensional structure diagram of the operating table in the present invention;

[0022] Figure 3 It is the three-dimensional structure diagram of the rotating outer cylinder and the rotating inner cylinder in the present invention;

[0023] Figure 4 It is the three-dimensional structure diagram of the rotating outer cylinder in the present invention;

[0024] Figure 5 It is the three-dimensional structure diagram of the rotating inner cylinder in the present invention;

[0025] Figure 6 It is the sectional view of the rotating inner cylinder in the present invention;

[0026] Figure 7 It is the three-dimensional structure diagram of the sliding frame in the present invention.

[0027] Explanation of reference numerals:

[0028] 1. Operating table; 2. Control panel; 3. Collection box; 4. Swing cylinder; 5. Lifting frame; 6. Tooth plate; 7. Welding rail; 8. Traveling gear ring; 9. Moving frame; 10. Traveling motor; 11. Welding cylinder; 12. Welding equipment; 13. Fixed seat; 14. Swing hoop; 15. Swing shaft; 16. Swing fan; 17. Rotating outer cylinder; 18. Limiting rail; 19. Rotating inner cylinder; 20. Limiting groove; 21. Clamping cavity; 22. Sliding frame; 23. Slide block; 24. Sliding groove; 25. Roller shaft; 26. Handle; 27. First storage cavity; 28. Through hole; 29. Connecting rod; 30. Clamping plate; 31. Outer magnetic plate; 32. Return spring; 33. Mounting frame; 34. Flipping gear ring; 35. Flipping motor; 36. Driving gear; 37. Locking cylinder; 38. Inner magnetic plate; 39. Notch; 40. Second storage cavity. Detailed implementation manners

[0029] The following will combine the attached Figures 1 to 7 to clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0030] The present invention provides an electron beam welding device for building square tubes through improvement, as Figures 1 - 7As shown in the figure, it includes an operating table 1. Symmetric fixing seats 13 are fixedly arranged on the top of the operating table 1. Symmetric rotating outer cylinders 17 are swingably installed on the tops of the fixing seats 13. A semi-cylindrical rotating inner cylinder 19 is rotatably arranged inside the rotating outer cylinder 17; a clamping cavity 21 is formed in the middle of the rotating inner cylinder 19. A sliding frame 22 is slidably installed in the clamping cavity 21. Multiple roller shafts 25 are movably installed inside the sliding frame 22; a connecting rod 29 is movably installed on the inner wall of the rotating inner cylinder 19. A clamping plate 30 for fixing the square pipe to be welded is fixedly arranged on the inner side of the connecting rod 29. An outer magnetic plate 31 is fixedly arranged on the outer side of the connecting rod 29; a swing cylinder 4 is also installed on the top of the operating table 1. The output end of the swing cylinder 4 is fixedly provided with a lifting frame 5. Welding rails 7 sleeved outside the square pipe to be welded are fixedly arranged on both sides of the lifting frame 5. A moving frame 9 is movably installed on the welding rail 7. A welding device 12 that can be adjusted in multiple directions is installed at the bottom of the moving frame 9; when the rotating outer cylinder 17 swings inwards, welding operations can be performed on the square pipe with a notch.

[0031] In this embodiment: The electron beam welding device for building square pipes is mainly divided into three parts: the operating table 1, the rotating outer cylinder 17, and the welding device 12. When the device is in use, first start the locking cylinder 37 and extend the inner magnetic plate 38 to both sides. The outer magnetic plate 31 drives the clamping plate 30 to move towards the middle and compresses the return spring 32. Then pull the sliding frame 22 outwards through the handle 26, and place the square pipe to be welded on the sliding frame 22. Then move the two sliding frames 22 towards the middle. When the notch parts are in contact, close the locking cylinder 37 and retract the inner magnetic plate 38 towards the middle. At this time, under the action of the return spring 32, the clamping plate 30 clamps and fixes the square pipe. When the notches of the two square pipes are perpendicular, under the cooperation of the driving gear 36 and the flipping gear ring 34, the rotating inner cylinder 19 rotates freely relative to the rotating outer cylinder 17 and cooperates with the welding device 12 on the welding rail 7 to perform all-round welding on the notch part. When the notch of the square pipe is in an inclined state, drive the lifting frame 5 to move downwards through the swing cylinder 4. At this time, under the cooperation of the toothed plate 6 and the swing fan 16, the two rotating inner cylinders 19 and the rotating outer cylinders 17 deflect inwards. At this time, the notch parts of the square pipe are completely attached, and then drive the welding device 12 to move along the welding rail 7 and perform all-round welding on the notch part.

[0032] Refer to the attached Figure 1 - attached Figure 2 As shown in the figure, a swing shaft 15 is fixedly arranged between the two rotating outer cylinders 17. A swing hoop 14 cooperating with the swing shaft 15 is fixedly arranged on the top of the fixing seat 13; a swing fan 16 is installed in the middle of the swing shaft 15. Toothed plates 6 meshing with the swing fan 16 are installed on both sides of the lifting frame 5.

[0033] In this embodiment: In order to ensure that the rotating outer cylinders 17 on both sides swing inwards relative to the top of the fixed seat 13, so as to meet the welding operations for various square tubes with different cutouts, the swing hoop 14 structure is designed. When the lifting frame 5 drives the rotating inner cylinders 19 and the rotating outer cylinders 17 on both sides to deflect, the welding rails 7 and the welding equipment 12 on both sides will also be lifted or lowered synchronously, so that the cutout is always located at the center position of the welding rail 7.

[0034] Refer to the appendix Figure 1 - appendix Figure 2 , a traveling gear ring 8 is installed on the inner wall of the welding rail 7, a traveling motor 10 is installed on the outer wall of the moving frame 9, a welding cylinder 11 is installed at the bottom of the moving frame 9, and the welding equipment 12 is installed at the output end of the welding cylinder 11.

[0035] In this embodiment: When the cutout of the square tube is an inclined cutout, in order to perform 360-degree omnidirectional welding operations on the cutout abutting portion, the welding cylinder 11 structure is designed to adjust the distance between the welding equipment 12 and the square tube.

[0036] Refer to the appendix Figure 1 - appendix Figure 2 , a control panel 2 is further provided on the operating table 1, and collecting bins 3 located below the welding rail 7 are provided on both sides of the operating table 1.

[0037] In this embodiment: In order to control the operation of the equipment, the control panel 2 structure is designed. During welding operations, in order to collect welding slag, the symmetrical collecting bin 3 structure is designed.

[0038] Refer to the appendix Figure 4 - appendix Figure 5 , a limiting rail 18 is fixedly provided on the inner wall of the rotating outer cylinder 17, a limiting groove 20 matching with the limiting rail 18 is provided on the outer wall of the rotating inner cylinder 19, and a notch 39 facilitating material taking is provided at the top of the rotating outer cylinder 17.

[0039] In this embodiment: In order to ensure the free rotation of the rotating inner cylinder 19 relative to the rotating outer cylinder 17, so as to perform 360-degree welding on the cutout, the mutually matching limiting rail 18 and limiting groove 20 structures are designed.

[0040] Refer to the appendix Figure 6 - appendix Figure 7 , symmetrical sliding blocks 23 are provided on the outer walls on both sides of the sliding frame 22, sliding grooves 24 matching with the sliding blocks 23 are provided on the inner walls on both sides of the clamping cavity 21, and a handle 26 is further provided on the outer wall of the sliding frame 22.

[0041] In this embodiment: When loading, first pull the sliding frame 22 outwards through the handle 26, place the square tube to be welded on the sliding frame 22, and then slide the sliding frame 22 inwards. Since a plurality of roller shafts 25 are movably installed inside the sliding frame 22 and the friction force is small, the square tube can freely adjust its position relative to the sliding frame 22, so as to further adjust the butting position of the cut ends of the square tubes on both sides.

[0042] Refer to the appendix Figure 4 - appendix Figure 7 , a first storage cavity 27 is provided on the inner wall of the rotating inner cylinder 19, a second storage cavity 40 is provided on the outer wall of the rotating inner cylinder 19, a through hole 28 is provided between the first storage cavity 27 and the second storage cavity 40, a connecting rod 29 is movably arranged in the through hole 28, a plurality of reset springs 32 are connected to the inner wall of the clamping plate 30, and the bottom of the reset spring 32 is connected to the inner wall of the first storage cavity 27. A mounting frame 33 is fixedly provided at the bottom of the rotating outer cylinder 17, a locking cylinder 37 is installed inside the mounting frame 33, and an inner magnetic plate 38 that cooperates with the outer magnetic plate 31 is installed at the output end of the locking cylinder 37.

[0043] In this embodiment: In order to improve the degree of automation and automatically lock and unlock the square tube, a locking cylinder 37 structure is designed. When installing the square tube, start the locking cylinder 37 at this time and extend the inner magnetic plate 38 outwards to both sides. Under the action of opposite-sex attraction, the outer magnetic plate 31 drives the clamping plate 30 to move towards the middle and compresses the reset spring 32. At this time, the square tube is driven by the sliding frame 22 to be installed in the middle. When the square tubes on both sides are butted, close the locking cylinder 37 and retract the inner magnetic plate 38 towards the middle. At this time, under the action of the reset spring 32, the clamping plate 30 clamps and fixes the square tube.

[0044] Refer to the appendix Figure 1 and appendix Figure 3 - appendix Figure 4 , a flipping gear ring 34 is fixedly installed on the outer wall of the rotating inner cylinder 19, a flipping motor 35 is also installed on the mounting frame 33, and a driving gear 36 that meshes with the flipping gear ring 34 is installed at the output end of the flipping motor 35.

[0045] In this embodiment: When the cut ends of the square tubes on both sides are perpendicular, in order to weld the cut ends in all directions, the rotating inner cylinder 19 rotates freely relative to the rotating outer cylinder 17 under the cooperation of the flipping motor 35 and the flipping gear ring 34.

[0046] Refer to the appendix Figure 3 - appendix Figure 4 , the angle of the notch 39 is less than 180 degrees.

[0047] In this embodiment: Since the rotating inner cylinder 19 is rotatably arranged inside the rotating outer cylinder 17, the rotating inner cylinder 19 is semi-cylindrical and has an angle of 180 degrees. In order to install the rotating inner cylinder 19 and ensure its stable rotation and prevent accidental detachment, the opening angle of the notch 39 is made less than 180 degrees.

[0048] The working principle of the present invention: When the device is in use, first start the locking cylinder 37 and extend the inner magnetic plate 38 to both sides. The outer magnetic plate 31 drives the clamping plate 30 to move towards the middle and compresses the return spring 32. Then, pull the sliding frame 22 outwards through the handle 26 and place the square tube to be welded on the sliding frame 22. Then move the two sliding frames 22 towards the middle. When the cut surfaces are in contact, close the locking cylinder 37 and contract the inner magnetic plate 38 towards the middle. At this time, under the action of the return spring 32, the clamping plate 30 clamps and fixes the square tube. When the cut surfaces of the two square tubes are perpendicular, with the cooperation of the driving gear 36 and the flipping gear ring 34, the rotating inner cylinder 19 rotates freely relative to the rotating outer cylinder 17 and cooperates with the welding device 12 on the welding rail 7 to perform all-round welding on the cut surface. When the cut surface of the square tube is in an inclined state, the lifting frame 5 is driven to move downwards by the swinging cylinder 4. At this time, with the cooperation of the toothed plate 6 and the swinging fan 16, the two rotating inner cylinders 19 and the rotating outer cylinders 17 deflect inwards. At this time, the cut surfaces of the square tube are completely fitted, and then the welding device 12 is driven to move along the welding rail 7 to perform all-round welding on the cut surface.

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and creative features disclosed herein.

Claims

1. An electron beam welding device for building square tubes, comprising an operating table (1), characterized in that: A symmetrical fixed seat (13) is fixedly provided on the top of the operating table (1), a symmetrical rotating outer cylinder (17) is swingably installed on the top of the fixed seat (13), a semi-cylindrical rotating inner cylinder (19) is rotatably provided inside the rotating outer cylinder (17); a clamping cavity (21) is provided in the middle of the rotating inner cylinder (19), a sliding frame (22) is slidably installed in the clamping cavity (21), and a plurality of rollers (25) are movably installed inside the sliding frame (22); a connecting rod (29) is movably installed on the inner wall of the rotating inner cylinder (19), a clamping plate (30) for fixing the square tube to be welded is fixedly provided on the inner side of the connecting rod (29), and an outer magnetic plate (31) is fixedly provided on the outer side of the connecting rod (29); A swing cylinder (4) is also installed on the top of the operating table (1), and a lifting frame (5) is fixedly installed on the output end of the swing cylinder (4). Welding rails (7) sleeved on the outside of the square tube to be welded are fixedly installed on both sides of the lifting frame (5). A moving frame (9) is movably installed on the welding rail (7), and a multi-directionally adjustable welding device (12) is installed at the bottom of the moving frame (9); when the rotating outer cylinder (17) swings inward, the square tube with a cutout can be welded.

2. The electron beam welding device for building square tubes according to claim 1, characterized in that: A swing shaft (15) is fixedly arranged between the rotating outer cylinders (17) on both sides, and a swing hoop (14) matched with the swing shaft (15) is fixedly arranged on the top of the fixed seat (13); a swing fan (16) is installed in the middle of the swing shaft (15), and tooth plates (6) meshing with the swing fan (16) are installed on both sides of the lifting frame (5).

3. The electron beam welding device for building square tubes according to claim 1, characterized in that: A travel gear ring (8) is installed on the inner wall of the welding rail (7), a travel motor (10) is installed on the outer wall of the moving frame (9), a welding cylinder (11) is installed at the bottom of the moving frame (9), and the welding equipment (12) is installed at the output end of the welding cylinder (11).

4. The electron beam welding device for building square tubes according to claim 1, characterized in that: A control panel (2) is also provided on the operating table (1), and collection boxes (3) located below the welding rail (7) are provided on both sides of the operating table (1).

5. The electron beam welding device for building square tubes according to claim 1, characterized in that: A limit rail (18) is fixedly arranged on the inner wall of the rotating outer cylinder (17), a limit groove (20) cooperating with the limit rail (18) is provided on the outer wall of the rotating inner cylinder (19), and a notch (39) for facilitating material removal is provided on the top of the rotating outer cylinder (17).

6. The electron beam welding device for building square tubes according to claim 1, characterized in that: Symmetrical sliding blocks (23) are arranged on the outer walls on both sides of the sliding frame (22), sliding grooves (24) cooperating with the sliding blocks (23) are opened on the inner walls on both sides of the clamping cavity (21), and a handle (26) is also arranged on the outer wall of the sliding frame (22).

7. An electron beam welding device for building square tubes according to any one of claims 1 to 6, characterized in that: A first receiving chamber (27) is provided on the inner wall of the rotating inner cylinder (19), a second receiving chamber (40) is provided on the outer wall of the rotating inner cylinder (19), a through hole (28) is provided between the first receiving chamber (27) and the second receiving chamber (40), the connecting rod (29) is movably arranged in the through hole (28), a plurality of groups of return springs (32) are connected to the inner wall of the clamping plate (30), and the bottom of the return spring (32) is connected to the inner wall of the first receiving chamber (27).

8. An electron beam welding device for building square tubes according to any one of claims 1 to 6, characterized in that: A mounting frame (33) is fixedly provided at the bottom of the rotating outer cylinder (17), a locking cylinder (37) is installed on the inner side of the mounting frame (33), and an inner magnetic plate (38) matching with the outer magnetic plate (31) is installed at the output end of the locking cylinder (37).

9. The electron beam welding device for building square tubes according to claim 8, characterized in that: A turning gear ring (34) is fixedly mounted on the outer wall of the rotating inner cylinder (19), a turning motor (35) is also mounted on the mounting frame (33), and a driving gear (36) meshing with the turning gear ring (34) is mounted on the output end of the turning motor (35).

10. The electron beam welding device for building square tubes according to claim 5, characterized in that: The angle of the notch (39) is less than (180) degrees.

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