Numerical control welding device for special-shaped seams

Abstract

The invention relates to the technical field of welding, and discloses a numerical control welding device for special-shaped seams, which comprises a welding table, the welding table is rotatably connected with a turntable, the turntable is fixedly provided with a limiting seat, the limiting seat is provided with a flange pipe, and the limiting seat is slidably connected with a T-shaped abutting block and two L-shaped limiting blocks. A movable mechanical clamping jaw is arranged above the rotary disc, a branch pipe is clamped on the mechanical clamping jaw, a mechanical arm is fixed to the welding table, and a welding gun is installed on the mechanical arm. Movable sliding seats are arranged on the two sides of the limiting seat, tooth blocks are rotationally connected to the sliding seats, and arc-shaped cleaning seats are fixed to one ends of the tooth blocks, so that the circle center of a branch pipe and the circle center of an opening of a flange pipe can be conveniently located on the same straight line, the positioning accuracy can be improved, and the defects of weld joint dislocation, incomplete fusion or undercut are prevented. And therefore, the welding precision and quality are improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a CNC welding device for irregularly shaped seams. Background Technology

[0002] CNC welding equipment is a device that automates and precisely controls the welding process through a numerical control system. Its core lies in using digital signals to control the machine tool's movement and machining process, automatically completing welding tasks through preset programs, significantly improving welding quality and efficiency. T-shaped pipe welding is a common connection method. However, CNC welding equipment faces significant positioning difficulties when dealing with irregularly shaped seams in T-shaped pipes, severely restricting welding quality and efficiency. T-shaped pipes are formed by the perpendicular intersection of a flanged main pipe and a branch pipe. Their weld seam shape is complex, involving three-dimensional curves in space, especially at the interface between the branch pipe and the main pipe, where the weld seam trajectory is asymmetrically distributed.

[0003] In existing technologies, T-shaped pipes are often positioned manually or with simple clamps before welding. It is difficult to accurately control the relative position between the flange main pipe and the branch pipe. Manual operation relies on the worker's experience and is prone to positioning deviations, resulting in defects such as misalignment, incomplete fusion, or undercut of irregular welds. This reduces the structural strength and airtightness, and affects the quality of the weld. Summary of the Invention

[0004] This invention provides a CNC welding device for irregularly shaped seams, which allows the center of the branch pipe to be aligned with the center of the flange opening, improving positioning accuracy and preventing defects such as weld misalignment, incomplete fusion, or undercut. This improves welding precision and quality, solving the problem mentioned in the background art where manual operation relies on worker experience, easily leading to positioning deviations, resulting in defects such as irregularly shaped weld misalignment, incomplete fusion, or undercut, which in turn reduces structural strength and airtightness, affecting welding quality.

[0005] The present invention provides the following technical solution: a CNC welding device for irregular seams, comprising a welding table, a turntable rotatably connected to the welding table, a limiting seat fixed on the turntable, a flange pipe placed on the limiting seat, and a T-shaped abutment block and two L-shaped limiting blocks slidably connected to the limiting seat respectively, a movable mechanical gripper provided above the turntable, a branch pipe gripped on the mechanical gripper, and a robotic arm fixed on the welding table, with a welding gun installed on the robotic arm; Both sides of the limiting seat are provided with movable sliding seats, and toothed blocks are rotatably connected to the sliding seats. An arc-shaped cleaning seat is fixed at one end of the toothed block, and a movable brush block and wiping block are provided inside the arc-shaped cleaning seat.

[0006] As an optional embodiment of the CNC welding device for irregular seams described in this invention, wherein: one end of the L-shaped limiting block is slidably connected to a positioning pin, a first spring is connected between the positioning pin and the L-shaped limiting block, and the other end of the L-shaped limiting block is fixed with a first abutting block, the first abutting block abutting against the T-shaped abutting block.

[0007] As an optional embodiment of the CNC welding device for irregular seams described in this invention, the welding table is fixed with a servo motor that drives the turntable to rotate, an electric push rod is fixed on the turntable, a mounting plate is fixed on the piston rod of the electric push rod, a rotating shaft is rotatably connected to the mounting plate, and the mechanical gripper is fixedly connected to the rotating shaft.

[0008] As an optional embodiment of the CNC welding device for irregular seams described in this invention, the limiting seat has rectangular grooves on both sides, a guide rod is provided in the rectangular groove, the guide rod is fixed on the limiting seat, and the guide rod is elastically connected to the sliding seat through a third spring. A first abutting rod is fixed on one side of the sliding seat, and a connecting bracket is installed on the first abutting rod. The connecting bracket is slidably connected to the limiting seat.

[0009] As an optional embodiment of the CNC welding device for irregular seams described in this invention, wherein: a rack is meshed with the lower part of the toothed block, a sliding bracket is fixed on the rack, the sliding bracket is elastically connected to the sliding seat through a fourth spring, an extension block is slidably connected to one end of the rack, and a fifth spring is connected between the extension block and the rack.

[0010] As an optional embodiment of the CNC welding device for irregular seams described in this invention, the extension block has an abutting groove on its side, the rack has a second abutting rod slidably connected to its side, one end of the second abutting rod abuts against the extension block, and a limit block is fixed on the second abutting rod.

[0011] As an optional embodiment of the CNC welding device for irregular seams described in this invention, wherein: both sides of the T-shaped contact block abut against a first contact bracket, and the first contact bracket is elastically connected to the limiting seat through a sixth spring.

[0012] As an optional embodiment of the CNC welding device for irregular seams described in this invention, a second abutting bracket is provided above the limiting seat, the second abutting bracket is elastically connected to the mounting plate through a seventh spring, and the upper end of the second abutting bracket abuts against a second abutting wedge.

[0013] As an optional embodiment of the CNC welding device for irregular seams described in this invention, wherein: an abutment strip is fixed on the rotating shaft, and a torsion spring is connected between the rotating shaft and the mounting plate; a Z-shaped abutment block abuts on the abutment strip; the Z-shaped abutment block is slidably connected to the mounting plate; and the Z-shaped abutment block is elastically connected to the second abutment wedge block through an eighth spring.

[0014] As an optional embodiment of the CNC welding device for irregular seams described in this invention, wherein: an arc-shaped plate is connected to the brush block and the wiping block, two guide posts are fixed on the arc-shaped plate, one of the guide posts is elastically connected to the arc-shaped cleaning seat through a second spring, a T-shaped top block is slidably connected to the arc-shaped cleaning seat, the T-shaped top block abuts against the other guide post, and several staggered arc-shaped abutting blocks are fixed on both sides of the limiting seat.

[0015] The present invention has the following beneficial effects: 1. In this CNC welding device for irregular seams, the irregular seams at the connection between the branch pipe and the flange pipe can be automatically welded by the cooperation of the robotic arm and the welding gun. The limiting seat is used to position the flange pipe. The L-shaped limiting blocks at both ends of the L-shaped limiting block can abut against the two ends of the flange pipe to achieve the purpose of initial limiting. The positioning pins elastically connected on the L-shaped limiting blocks can abut against the end face of the flange pipe. When the positioning pins encounter the flange holes on the flange pipe, they can be automatically inserted and quickly positioned to prevent the flange pipe from shifting position during the welding process. The branch pipe can be clamped by the mechanical gripper. The branch pipe can be easily moved down to abut against the flange pipe by the cooperation of the electric push rod and the mounting plate, so that the center of the branch pipe and the center of the flange pipe opening are on the same straight line, which can improve the positioning accuracy and prevent defects such as weld misalignment, incomplete fusion or undercut, thereby improving the welding accuracy and quality. The turntable is driven by a servo motor to rotate on the welding table, which in turn drives the flange pipe on the limit seat and the branch pipe on the mechanical gripper to rotate synchronously, reducing welding dead angles and welding times, and improving welding quality.

[0016] 2. In this CNC welding device for irregular seams, the brush block and wiping block can be installed through the arc-shaped cleaning seats set on both sides of the limiting seat. The brush block can remove hard impurities and dust attached to the surface of the flange pipe opening, reduce the weld gap between the flange pipe and the branch pipe, and improve the welding effect. The wiping block can wipe away the remaining impurities, which can further improve the welding quality. Through the cooperation of the T-shaped abutment block, the first abutment bracket and the extension block, when the flange pipe is placed on the limiting seat, the rack can automatically move horizontally. When the rack and the rack block cooperate, the rack causes the rack block to drive the arc-shaped cleaning seat to automatically deflect during the movement, thereby adhering to the surface of the flange pipe. When the electric push rod moves the branch pipe downwards and positions it with the flange pipe, it can simultaneously move the second abutment bracket on the mounting plate downwards, causing the second abutment bracket to contact the first abutment rod. This allows the sliding seat to automatically move the arc-shaped cleaning seat horizontally on the flange pipe surface to clean the flange pipe opening surface. The second abutment rod on the rack cooperates with the abutment groove on the extension block. After cleaning, the second abutment rod can contact the limit seat, retract, and contact the abutment groove, causing the extension block to automatically move upwards and release contact with the first abutment bracket. This allows the arc-shaped cleaning seat to automatically deflect and reset, leaving sufficient space around the workpiece during welding, reducing obstruction, and improving the welding effect.

[0017] 3. In this CNC welding device for irregular seams, the cooperation of the arc plate and two guide columns facilitates the sliding of the brush block and wiping block on the arc cleaning seat. On the one hand, it can increase the working range of the brush block and wiping block and reduce cleaning dead corners. On the other hand, it is beneficial to remove stubborn impurities and improve the welding quality of irregular seams of workpieces. When the arc-shaped cleaning seat moves, the intermittent contact with the T-shaped top block is achieved through several staggered arc-shaped contact blocks on both sides of the limiting seat. This causes the T-shaped top block to push the guide column to slide on the arc-shaped cleaning seat, thus enabling the brush block and wiping block to reciprocate on the arc-shaped cleaning seat. Attached Figure Description

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

[0019] Figure 2 This is a schematic diagram of the turntable structure of the present invention.

[0020] Figure 3 This is a cross-sectional view of the limiting seat structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the limiting seat structure of the present invention.

[0022] Figure 5 This is one of the schematic diagrams of the internal structure of the limiting seat of the present invention.

[0023] Figure 6 This is a second schematic diagram of the internal structure of the limiting seat of the present invention.

[0024] Figure 7 This is a schematic diagram of the sliding seat structure of the present invention.

[0025] Figure 8 This is a schematic diagram of the anti-collision inclined groove structure of the present invention.

[0026] Figure 9 for Figure 2 Enlarged view of point A in the middle.

[0027] Figure 10 for Figure 3 Enlarged view of section B in the middle.

[0028] Figure 11 A schematic diagram of the tooth block structure of the present invention.

[0029] In the diagram: 1. Welding table; 2. Turntable; 3. Limiting seat; 4. Flange pipe; 5. T-shaped contact block; 6. L-shaped limiting block; 7. Mechanical gripper; 8. Branch pipe; 9. Robotic arm; 10. Welding gun; 11. Sliding seat; 12. Tooth block; 13. Arc-shaped cleaning seat; 14. Brush block; 15. Wiping block; 16. Positioning pin; 17. First spring; 18. Contact groove; 19. First contact block; 20. Servo motor; 21. Electric push rod; 22. Mounting plate; 23. Rotating shaft; 24. Rectangular groove; 25. Guide rod; 26. Third spring; 27. First abutment rod; 28. Connecting bracket; 29. ​​Rack; 291. Fifth spring; 30. Sliding bracket; 31. Fourth spring; 32. Extension block; 33. Second abutment rod; 34. Limiting block; 35. First abutment bracket; 36. Sixth spring; 37. Arc plate; 38. Guide post; 381. Second spring; 39. T-shaped top block; 40. Arc-shaped abutment block; 41. Second abutment bracket; 42. Seventh spring; 43. Second abutment wedge; 44. Abutment strip; 45. Torsion spring; 46. Z-shaped abutment block; 47. Eighth spring. Detailed Implementation

[0030] 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.

[0031] Example 1, please refer to Figures 1 to 11 A CNC welding device for irregular seams includes a welding table 1, a turntable 2 rotatably connected to the welding table 1, a limiting seat 3 fixed on the turntable 2, a flange pipe 4 placed on the limiting seat 3, and a T-shaped abutment block 5 and two L-shaped limiting blocks 6 slidably connected to the limiting seat 3 respectively. A movable mechanical gripper 7 is provided above the turntable 2, and a branch pipe 8 is held on the mechanical gripper 7. A robotic arm 9 is fixed on the welding table 1, and a welding gun 10 is installed on the robotic arm 9. Both sides of the limiting seat 3 are provided with movable sliding seats 11. A toothed block 12 is rotatably connected to the sliding seat 11. An arc-shaped cleaning seat 13 is fixed to one end of the toothed block 12. A movable brush block 14 and a wiping block 15 are provided inside the arc-shaped cleaning seat 13.

[0032] One end of the L-shaped limiting block 6 is slidably connected to a positioning pin 16, and a first spring 17 is connected between the positioning pin 16 and the L-shaped limiting block 6. The other end of the L-shaped limiting block 6 is fixed with a first abutting block 19, which abuts against the T-shaped abutting block 5.

[0033] refer to Figures 1 to 6 A servo motor 20 that drives the turntable 2 to rotate is fixed on the welding table 1. An electric push rod 21 is fixed on the turntable 2. A mounting plate 22 is fixed on the piston rod of the electric push rod 21. A rotating shaft 23 is rotatably connected to the mounting plate 22. The mechanical gripper 7 is fixedly connected to the rotating shaft 23.

[0034] During T-shaped pipe welding, flange 4 is placed on limiting seat 3, with the flange portion of flange 4 fitting against the end of limiting seat 3. During placement, flange 4 contacts T-shaped abutment block 5, causing T-shaped abutment block 5 to slide downwards on limiting seat 3. This achieves the purpose of contact between first abutment block 19 and T-shaped abutment block 5, allowing L-shaped limiting block 6 to slide and retract on limiting seat 3, causing L-shaped limiting block 6 to abut against flange 4. When flange 4 is in the correct position, the L-shaped limiting block... The positioning pin 16 on block 6 can be directly inserted into the flange hole of flange pipe 4 for positioning, so as to prevent flange pipe 4 from deflecting during welding and affecting the welding accuracy. If flange pipe 4 is in a deflected state, the angle of flange pipe 4 on limit seat 3 needs to be manually adjusted. At this time, T-shaped abutment block 5 abuts against flange pipe 4 under the action of spring force of first spring 17. When flange pipe 4 is aligned and T-shaped abutment block 5 encounters the corresponding flange hole on flange pipe 4, T-shaped abutment block 5 can be directly inserted. Mechanical grippers 7 clamp the branch pipe 8 to be welded. The center of the clamped branch pipe 8 is on the same straight line as the center of the opening of the flange pipe 4. When the piston rod of the electric push rod 21 retracts, it adjusts the height of the mounting plate 22, so that the mechanical grippers 7 and the clamped branch pipe 8 move vertically downward, so that the lower end of the branch pipe 8 fits tightly with the flange pipe 4, to prevent loosening during welding and affecting the welding quality. If the angle of the branch pipe 8 deflects and cannot fit with the surface of the flange pipe 4, the angle of the mechanical grippers 7 can be rotated to make the rotating shaft 23 rotate on the mounting plate 22 so that the branch pipe 8 fits with the flange pipe 4. This can improve the positioning accuracy during welding, to prevent defects such as weld misalignment, incomplete fusion or undercut, thereby improving the welding accuracy and quality. After the branch pipe 8 and flange pipe 4 are positioned, the robotic arm 9 fixed on the welding table 1 drives the welding gun 10 to press against the irregular weld seam on the branch pipe 8 and flange pipe 4 to automatically perform welding. At the same time, the servo motor 20 is started, and the servo motor 20 drives the turntable 2 to rotate on the welding table 1, so that the flange pipe 4 on the limit seat 3 and the branch pipe 8 on the mechanical gripper 7 rotate synchronously, which can reduce welding dead angles and welding times, and improve welding quality and efficiency.

[0035] Example 2 is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1 to 11 Both sides of the limiting seat 3 are provided with rectangular grooves 24, and guide rods 25 are provided in the rectangular grooves 24. The guide rods 25 are fixed on the limiting seat 3, and the guide rods 25 are elastically connected to the sliding seat 11 through the third spring 26. A first abutting rod 27 is fixed on one side of the sliding seat 11, and a connecting bracket 28 is installed on the first abutting rod 27. The connecting bracket 28 is slidably connected to the limiting seat 3.

[0036] A rack 29 is meshed with the lower part of the toothed block 12. A sliding bracket 30 is fixed on the rack 29. The sliding bracket 30 is elastically connected to the sliding seat 11 through a fourth spring 31. An extension block 32 is slidably connected to one end of the rack 29. A fifth spring 291 is connected between the extension block 32 and the rack 29.

[0037] The side of the extension block 32 is provided with an abutting groove 18, and the side of the rack 29 is slidably connected with a second abutting rod 33, and one end of the second abutting rod 33 abuts against the extension block 32. A limit block 34 is fixed on the second abutting rod 33.

[0038] Both sides of the T-shaped contact block 5 are abutted by the first contact bracket 35, and the first contact bracket 35 is elastically connected to the limiting seat 3 through the sixth spring 36.

[0039] A second abutting bracket 41 is provided above the limiting seat 3. The second abutting bracket 41 is elastically connected to the mounting plate 22 through the seventh spring 42, and the upper end of the second abutting bracket 41 abuts against the second abutting wedge 43.

[0040] A contact bar 44 is fixed on the rotating shaft 23, and a torsion spring 45 is connected between the rotating shaft 23 and the mounting plate 22. A Z-shaped contact block 46 is abutted on the contact bar 44. The Z-shaped contact block 46 is slidably connected to the mounting plate 22, and the Z-shaped contact block 46 is elastically connected to the second contact wedge block 43 through the eighth spring 47.

[0041] refer to Figures 1 to 11The opening on the flange pipe 4 is connected to the branch pipe 8. However, drilling equipment is usually used to operate the opening. During the operation, some hard impurities and dust will adhere to the welding surface of the flange pipe 4, which will affect the welding quality and needs to be cleaned. When the T-shaped abutment block 5 is abutted and moves downward, it can achieve the purpose of abutting against the two first abutment supports 35. In the initial state, the upper part of the first abutment support 35 is in contact with the extension block 32. When the first abutment support 35 slides on the limit seat 3, it can push the extension block 32 to move horizontally. The sixth spring 36 stores force, causing the extension block 32 to drive the rack 29 to move. At the same time, the sliding support 30 moves horizontally on the sliding seat 11. The fourth spring 31 stores force, causing the rack 29 to drive the tooth block 12 to automatically deflect on the sliding seat 11, causing the arc-shaped cleaning seat 13 to abut against the welding surface of the flange pipe 4, and the brush block 14 and the wiping block 15 to be in close contact with the welding surface of the flange pipe 4. When the mounting plate 22 moves down, it can drive the second abutment bracket 41 to move down synchronously. The elastic force of the seventh spring 42 is greater than that of the third spring 26. With the cooperation of the connecting bracket 28, when the second abutment bracket 41 abuts against the first abutment rod 27, it can drive the two sliding seats 11 to slide on the corresponding guide rod 25. The third spring 26 stores force, so that the arc-shaped cleaning seat 13, brush block 14 and wiping block 15 move horizontally. The brush block 14 can brush away the hard impurities and dust attached to the surface of the flange pipe 4 opening, reduce the weld gap between the flange pipe 4 and the branch pipe 8, and improve the welding effect. The wiping block 15 can wipe away the remaining impurities, which can further improve the welding quality. After the brush block 14 and wiping block 15 have finished cleaning, when the limiting seat 3 continues to move, it can drive the second abutment rod 33 to abut against the limiting seat 3, so that the second abutment rod 33 can slide on the rack 29 and retract into the extension block 32 to abut against the abutment groove 18, so that the extension block 32 can slide vertically on the rack 29. The fifth spring 291 stores force, which can realize the purpose of releasing the abutment between the extension block 32 and the first abutment bracket 35, so that the fourth spring 31 can release the elastic force, so that the rack 29 can drive the toothed block 12 and the arc-shaped cleaning seat 13 to reset synchronously, so that there is enough space around the workpiece during welding, reducing obstruction, and improving the welding effect; When the sliding seat 11 stops moving, the telescopic rod of the electric push rod 21 continues to retract, enabling the second abutment bracket 41 to slide on the mounting plate 22. The seventh spring 42 stores force. At this time, the branch pipe 8 is not in contact with the flange pipe 4. If the position of the branch pipe 8 deviates, the second abutment bracket 41 abuts against the second abutment wedge 43. The second abutment wedge 43 drives the Z-shaped abutment block 46 to slide on the mounting plate 22. One end of the Z-shaped abutment block 46 abuts against the abutment strip 44, promoting... The contact bar 44 causes the rotating shaft 23 to deflect, and the torsion spring 45 stores force, which can realize the purpose of the mechanical gripper 7 driving the branch pipe 8 to rotate automatically. This facilitates the rotation of the branch pipe 8 when it moves down and fits with the flange pipe 4, improving the positioning accuracy. If the branch pipe 8 does not deflect, it cannot rotate when it fits with the flange pipe 4. When the second contact bracket 41 and the second contact wedge 43 abut, the second contact wedge 43 slides on the Z-shaped contact block 46, and the eighth spring 47 stores force.

[0042] The first contact bracket 35 is provided with a contact slope. When the first contact bracket 35 is reset, it can contact the extension block 32, causing the extension block 32 to move upward so that the first contact bracket 35 can move to the other side of the extension block 32, so that the first contact bracket 35 can push the extension block 32 to move next time.

[0043] Example 3 is an improvement upon Example 2. For details, please refer to [link / reference]. Figures 1 to 11 An arc-shaped plate 37 is connected to the brush block 14 and the wiping block 15. Two guide posts 38 are fixed on the arc-shaped plate 37. One of the guide posts 38 is elastically connected to the arc-shaped cleaning seat 13 through the second spring 381. A T-shaped top block 39 is slidably connected to the arc-shaped cleaning seat 13. The T-shaped top block 39 abuts against the other guide post 38. Several staggered arc-shaped abutting blocks 40 are fixed on both sides of the limiting seat 3.

[0044] refer to Figures 4 to 6 To improve the cleaning effect, the two arc-shaped cleaning seats 13 can drive the T-shaped top block 39 to move synchronously during the movement, so that the T-shaped top block 39 and the arc-shaped contact block 40 can make intermittent contact, causing the T-shaped top block 39 to move upward and push one of the guide columns 38 to slide on the arc-shaped cleaning seat 13. This allows the arc-shaped plate 37 to drive the brush block 14 and the wiping block 15 to reciprocate. On the one hand, it can increase the working range of the brush block 14 and the wiping block 15 and reduce cleaning dead corners. On the other hand, it is beneficial to remove stubborn impurities and improve the quality of welding of irregular seams of workpieces. The arc-shaped contact blocks 40 on both sides of the limiting seat 3 are staggered, so that the arc-shaped plate 37 can push the other arc-shaped plate 37 to move synchronously during the sliding process. This design can reduce cleaning dead corners and improve the quality of cleaning.

[0045] The servo motor 20, electric push rod 21, mechanical gripper 7, and robotic arm 9 are all electrically connected to the controller via wires.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A numerical control welding device for a profiled seam, comprising a welding table (1), characterized in that: The welding platform (1) is rotatably connected with a rotating disc (2), the rotating disc (2) is fixed with a limiting seat (3), the limiting seat (3) is placed with a flange pipe (4), and the limiting seat (3) is slidably connected with a T-shaped resisting block (5) and two L-shaped limiting blocks (6), respectively, a movable mechanical clamp jaw (7) is arranged above the rotating disc (2), the mechanical clamp jaw (7) clamps a branch pipe (8), a mechanical arm (9) is fixed on the welding platform (1), and a welding gun (10) is arranged on the mechanical arm (9). Both sides of the limiting seat (3) are provided with movable sliding seats (11), the sliding seats (11) are rotatably connected with tooth blocks (12), one end of the tooth blocks (12) is fixed with an arc-shaped cleaning seat (13), and the arc-shaped cleaning seat (13) is provided with movable brush blocks (14) and wiping blocks (15).

2. The numerical control welding device for a profiled seam according to claim 1, characterized in that: One end of the L-shaped limiting block (6) is slidably connected with a positioning pin (16), the positioning pin (16) and the L-shaped limiting block (6) are connected with a first spring (17), and the other end of the L-shaped limiting block (6) is fixed with a first resisting block (19), the first resisting block (19) abuts against the T-shaped resisting block (5).

3. The numerical control welding device for a profiled seam according to claim 1, characterized in that: The welding platform (1) is fixed with a servo motor (20) for driving the rotating disc (2) to rotate, the rotating disc (2) is fixed with an electric push rod (21), the piston rod of the electric push rod (21) is fixed with a mounting plate (22), the mounting plate (22) is rotatably connected with a rotating shaft (23), and the mechanical clamp jaw (7) is fixedly connected with the rotating shaft (23).

4. The numerical control welding device for a profiled seam according to claim 1, characterized in that: Both sides of the limiting seat (3) are provided with rectangular grooves (24), the rectangular grooves (24) are provided with guide rods (25), the guide rods (25) are fixed on the limiting seat (3), the guide rods (25) are elastically connected with the sliding seats (11) through third springs (26), one side of the sliding seat (11) is fixed with a first resisting rod (27), the first resisting rod (27) is provided with a connecting bracket (28), and the connecting bracket (28) is slidably connected with the limiting seat (3).

5. The numerical control welding device for a profiled seam according to claim 1, characterized in that: The tooth blocks (12) are meshingly connected with a rack (29) below, the rack (29) is fixed with a sliding bracket (30), the sliding bracket (30) is elastically connected with the sliding seat (11) through a fourth spring (31), and one end of the rack (29) is slidably connected with an extension block (32).

6. The numerical control welding device for a profiled seam according to claim 5, characterized in that: The extension block (32) is provided with a resisting inclined groove (18) on the side surface, the rack (29) is slidably connected with a second resisting rod (33) on the side surface, one end of the second resisting rod (33) abuts against the extension block (32), and the second resisting rod (33) is fixed with a limiting block (34).

7. The numerical control welding device for a profiled seam according to claim 1, characterized in that: Both sides of the T-shaped resisting block (5) abut against first resisting brackets (35), and the first resisting brackets (35) are elastically connected with the limiting seat (3) through sixth springs (36).

8. The numerical control welding device for a profiled seam according to claim 3, characterized in that: The upper portion of the limiting seat (3) is provided with a second contact support (41), the second contact support (41) is elastically connected with the mounting plate (22) through a seventh spring (42), and the upper end of the second contact support (41) is in contact with a second contact wedge (43).

9. The numerical control welding device for a profiled seam according to claim 8, characterized in that: The rotating shaft (23) is fixed with a contact strip (44), a torsional spring (45) is connected between the rotating shaft (23) and the mounting plate (22), the contact strip (44) is in contact with a Z-shaped contact block (46), the Z-shaped contact block (46) is slidably connected on the mounting plate (22), and the Z-shaped contact block (46) is elastically connected with the second contact wedge (43) through an eighth spring (47).

10. The numerical control welding device for a profiled seam according to claim 1, characterized in that: The brush block (14) and the wiping block (15) are connected with an arc-shaped plate (37), the arc-shaped plate (37) is fixed with two guide columns (38), one of the guide columns (38) is elastically connected with the arc-shaped cleaning seat (13) through a second spring (381), the arc-shaped cleaning seat (13) is slidably connected with a T-shaped top block (39), the T-shaped top block (39) is in contact with the other guide column (38), and the two sides of the limiting seat (3) are fixed with a plurality of arc-shaped contact blocks (40) which are distributed in a staggered manner.

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