Laser-electric arc composite welding head for equidirectional symmetrical welding

Abstract

The utility model discloses a laser electric arc hybrid welding head for equidirectional symmetrical welding, which comprises a connecting seat B, a laser head, a sliding table A, a rotating shaft, a connecting seat A, an electric arc welding gun and a laser tracker, the laser head comprises an upper laser head unit and a lower laser head unit, and the sliding table A is arranged on the connecting seat B; the rotating shaft is driven by a driving device A to move on the connecting base B in the X-axis direction, a center hole penetrating through the rotating shaft vertically is formed in the rotating shaft, the top end of the rotating shaft is rotationally arranged on the sliding table A, the upper laser head unit and the lower laser head unit are located above and below the rotating shaft respectively, the connecting base A is indirectly installed on the rotating shaft, and the electric arc welding gun is installed on the connecting base A; the laser tracker is mounted on the connecting seat B; the problems that in the prior art, the relative position of an electric arc and a laser beam cannot be adjusted, and quality defects exist after welding due to the fact that an electric arc welding gun and a laser head cannot be cooperatively controlled in the same-direction symmetrical welding process are solved.

Description

Technical Field

[0001] The utility model relates to a laser arc composite welding head for isotropic symmetrical welding, belonging to the technical field of welding equipment. Background Art

[0002] The current laser arc hybrid welding head is disclosed in the Chinese utility model patent with authorization announcement number CN212043140U. It fixes the arc welding gun on the laser head through a fixing plate, which makes it impossible for the arc welding gun to rotate around the laser head and change the inclination angle between the arc welding gun and the laser head. As a result, when welding workpieces with symmetrical welding requirements, there are problems such as limited adjustment of the position of the arc relative to the light spot, and the inability to ensure the consistency of welding parameters such as the wire spacing due to the changing posture, resulting in uneven welding quality and difficulty in adjusting the welding path. The actual welding effect is poor, which easily leads to defects such as pores, inclusions, and local unfusion. To solve this problem, the Chinese utility model patent with authorization announcement number CN220330261U sets an arc guide rail, and the welding gun can rotate around the laser gun on the arc guide rail. However, the arc guide rail of this structure makes the structural size of the entire device larger, which is not suitable for welding in a relatively small space. Summary of the invention

[0003] The utility model aims to provide a laser arc hybrid welding head for isotropic symmetrical welding, so as to solve the technical defects of the laser arc hybrid welding head in the prior art that the laser arc hybrid welding head is large in size and is not suitable for welding workpieces in a small space.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is: a laser arc composite welding head for symmetrical welding in the same direction, including a connecting seat B, a laser head, a slide A, a rotating shaft, a connecting seat A, an arc welding gun and a laser tracker, the connecting seat B is used to be installed on the robot when in use, the laser head includes an upper laser head unit and a lower laser head unit, the upper laser head unit is installed on the connecting seat B and is connected to the laser when in use, a collimating mirror is arranged in the upper laser head unit, and the lower laser head unit is arranged on the connecting seat B, which is provided with a focusing mirror, the slide A is installed on the connecting seat B, and is driven by the driving device A to move along the X-axis direction on the connecting seat B, a center hole running through the upper and lower parts of the rotating shaft is opened on the rotating shaft, the top end of the rotating shaft is rotatably arranged on the slide A, and is driven by the driving device A to move along the X-axis direction on the connecting seat B, The servo motor on A drives the rotation, and the upper laser head unit and the lower laser head unit are respectively located above and below the rotating shaft. The upper laser head unit receives the laser beam emitted by the laser and parallelizes it, and passes downward through the rotating shaft into the lower laser head unit to focus on a point to weld the workpiece to be welded. When the slide A moves to the two extreme positions along the X-axis direction, the parallelized laser beam of the upper laser head unit still passes through the center hole of the rotating shaft and enters the lower laser head unit downward. The connecting seat A is indirectly installed on the rotating shaft and can be slid and adjusted on the Z-axis and Y-axis relative to the rotating shaft. The arc welding gun is installed on the connecting seat A and can be slid and adjusted on the connecting seat A along the X-axis direction. The laser tracker is installed on the connecting seat B, and the laser tracker and the arc welding gun are respectively located on both sides of the laser head. The utility model arranges a slide A above a connection seat B of a laser composite welding head, and a rotating shaft is rotatably arranged on the slide A. The adjustment of the light wire spacing between the arc welding gun and the laser head is realized by the relative sliding of the slide A and the connection seat B. The sliding of the connection seat A on the Y axis and the Z axis relative to the rotating shaft can realize the adjustment of the Z axis position and the Y axis position of the arc welding gun. The relative position between the arc welding gun and the laser head can be adjusted by moving the arc welding gun relative to the connection seat A in the X axis direction. The slide A cooperates with the rotating shaft to change the originally coaxial laser head and arc welding gun into different axes. After the arc welding gun is adjusted to the appropriate filament spacing, the inclination angle between the arc welding gun and the laser head is adjusted to a suitable welding angle, so as to ensure better synergy between the arc and the laser beam during welding, improve welding speed and weld quality, and effectively avoid defects such as pores, inclusions, and local unfusion. The welding posture can be easily adjusted during symmetrical welding in the same direction. After changing the posture, the consistency of welding parameters such as the filament spacing can be ensured, and the uniformity of welding quality can be ensured. Since the welding gun of the utility model is installed on the rotating shaft, the overall volume is small, and the welding advantage for workpieces in a small space is obvious.

[0005] As a further improvement of the utility model, it also includes a slide B and a slide C, wherein the slide B is installed on one side of the rotating shaft and can slide on the rotating shaft in the Z-axis direction, the slide C is installed on the slide B and can slide on the slide B in the Y-axis direction, and the connecting seat A is installed on the slide C. The utility model provides the slide B and the slide C, and the arc welding gun moves in the Y-axis direction by the movement of the slide C in the Y-axis direction, and the slide B slides in the Z-axis direction, so that the slide C and the arc welding gun move in the Z-axis direction accordingly, and the arc welding gun slides in the X-axis direction on the connecting seat A in cooperation with the arc welding gun, so that the arc welding gun can be adjusted in the X-axis direction, the Y-axis direction and the Z-axis direction.

[0006] As a further improvement of the utility model, it also includes a connecting plate and a fixing device C, the upper end of the connecting plate is mounted on the connecting seat B, the laser tracker is mounted on the lower part of the connecting plate, one end of the fixing device C is mounted on the connecting plate, and the lower laser head unit is mounted on the fixing device C at one end away from the connecting plate. The utility model is provided with the fixing device C to facilitate the installation of the lower laser head unit, and the connecting plate is provided to facilitate the installation of the laser tracker.

[0007] As a further improvement of the present invention, an arc-shaped installation groove A is provided at the bottom of the connecting plate, and the laser tracker is installed on the connecting plate by two or more fastening screws passing through the installation groove A. The fastening screws are loosened to adjust the angle of the laser tracker. The present invention provides an arc-shaped installation groove, and the angle of the laser tracker can be adjusted as needed during use.

[0008] As a further improvement of the utility model, a cooling device is also included, which includes a cooling water channel, a cooling water pipe joint A and a cooling water pipe joint B provided on the lower laser head unit. The cooling water pipe joint A and the cooling water pipe joint B are respectively provided at the lower end and the upper end of the cooling water channel. The cooling water pipe joint A is connected to a cooling water inlet pipe in a use state to introduce cooling water into the cooling water channel. After the cooling water cools the lower laser head unit, the cooling water is discharged from a cooling water outlet pipe connected to the cooling water pipe joint B in a use state. The utility model introduces cooling water into the cooling water channel through the cooling water pipe joint, exchanges heat with the lower laser head unit to reduce the temperature of the lower laser head unit, and then discharges the cooling water from the cooling water pipe joint B, thereby preventing the lower laser head unit from being damaged due to excessive temperature and improving the service life of the utility model.

[0009] As a further improvement of the utility model, it also includes an air pipe joint, which is arranged at the lower part of the lower laser head unit. The air pipe joint is connected to the air pipe in use, and the air pipe provides compressed gas to blow away the smoke generated by welding during the welding process. The utility model connects the air pipe through the air pipe joint to blow away the smoke generated by welding in time, so as to avoid the smoke from blocking the laser beam and affecting the quality of welding.

[0010] As a further improvement of the utility model, a fixing device A is provided on the top of the connecting seat B, the fixing device A is horizontal, and the slide A is slidably provided on the fixing device A. The utility model facilitates the sliding connection between the slide and the connecting seat B and improves the stability of the movement of the slide A by providing the fixing device A.

[0011] As a further improvement of the utility model, one end of the bottom of the slide A is slidably connected to the fixing device A, and the other end of the slide A protrudes downward to form a connecting boss, and a connecting hole that runs through the slide A and the connecting boss is opened at the connecting boss, and a rotating shaft groove is set on the hole wall of the connecting hole, and a driven pulley is sleeved and fixed on the top of the rotating shaft, and the driven pulley is located in the rotating shaft groove and can rotate in the rotating shaft groove. A through groove is set on the side of the connecting boss close to the fixing device A, and a through hole is set on the side of the slide A for sliding connection with the fixing device A for the servo motor output shaft to pass through, and a driving pulley is installed on the servo motor output shaft, and the driving pulley and the driven pulley are connected by a synchronous belt passing through the through groove, and the servo motor drives the rotating shaft to rotate through the synchronous belt. The utility model facilitates the rotation installation of the rotating shaft and the slide A by setting the connecting boss and the rotating shaft groove, and provides space for the synchronous belt to connect the driving pulley and the driven pulley through the through groove.

[0012] As a further improvement of the utility model, a sliding groove is provided on the top of the fixing device A along the sliding direction of the slide A, the driving pulley is located in the sliding groove, and the driving pulley moves in the sliding groove while the slide A slides. The utility model prevents the driving pulley on the output shaft of the servo motor from interfering with the sliding of the slide A by providing the sliding groove on the fixing device A.

[0013] As a further improvement of the utility model, a dovetail groove A is provided on the lower surface of the slide A, and a guide rail A matching the dovetail groove A is provided on both sides of the slide groove on the fixing device A. The utility model enables the slide A to slide on the fixing device A through the matching of the dovetail groove A and the guide rail A.

[0014] In summary, the beneficial effects of the utility model are as follows: the laser arc composite welding head of the utility model can adjust the relative positions of the laser head and the arc welding gun. After adjusting the welding robot to a suitable position during welding, the parameters such as the filament spacing, defocus amount and welding gun tilt angle are appropriately adjusted through the slide and the rotating axis, so that the operability is enhanced when welding the symmetrical welds in the workpiece in the same direction. The suitable welding posture makes the weld shape flat and smooth, while reducing the probability of defects such as pores, undercuts and local unfusion. The utility model has a small size and can be suitable for welding workpieces in a smaller space. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the utility model.

[0016] Figure 2 It is a three-dimensional structural schematic diagram of the utility model.

[0017] Figure 3 It is a three-dimensional structural schematic diagram of the slide table A in the utility model.

[0018] Wherein: 1. Connecting seat B; 2. Upper laser head unit; 3. Lower laser head unit; 4. Slide A; 5. Rotating axis; 6. Servo motor; 7. Connecting seat A; 8. Arc welding gun; 9. Laser tracker; 10. Slide B; 11. Slide C; 12. Connecting plate; 13. Fixing device C; 14. Mounting groove A; 15. Fastening screw; 16. Cooling water pipe joint A; 17. Cooling water pipe joint B; 18. Air pipe joint; 19. Fixing device A; 20. Connecting boss; 21. Connecting hole; 22. Rotating axis groove; 23. Through hole; 24. Dovetail groove A; 25. Extension rod; 26. Fixing block; 27. Through groove. DETAILED DESCRIPTION

[0019] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0020] like Figure 1 and Figure 2The laser arc hybrid welding head for symmetrical welding shown in the figure comprises a connecting seat B1, a laser head, a slide A4, a rotating shaft 5, a connecting seat A7, an arc welding gun 8 and a laser tracker 9. The connecting seat B1 is used to be installed on the six-axis extension rod 25 of the fixed robot in the use state. The laser head in the utility model comprises an upper laser head unit 2 and a lower laser head unit 3. The upper laser head unit 2 is detachably mounted on the connecting seat B1 by bolts and is connected to the laser in the use state to receive the laser emitted by the laser. A collimator is arranged in the upper laser head unit 2 for parallelizing the laser. The lower laser head unit 3 is detachably mounted on the connecting seat B1 by bolts. A focusing lens is arranged in the lower laser head unit 3 for focusing the laser. The slide A 4 is installed on the connecting seat B1, and is driven by the driving device A to move on the connecting seat B1 along the X-axis direction. A central hole is opened on the rotating shaft 5 that runs through the upper and lower parts thereof. The top end of the rotating shaft 5 is rotatably arranged on the slide A4, and is driven by the servo motor 6 installed on the slide A4 to rotate within the range of -90°-90°. In the utility model, the rotating shaft 5 and the servo motor 6 are both installed on the slide A4, so when the slide A4 moves, the rotating shaft 5 and the servo motor move synchronously therewith. The upper laser head unit 2 and the lower laser head unit 3 are respectively located above and below the rotating shaft 5. Since the upper laser head unit 2 and the lower laser head unit 3 are both installed on the connecting seat B1, the upper laser head unit 2 and the lower laser head unit 3 are connected relative to each other when the slide A4 moves. The position of the socket B1 remains stationary, the upper laser head unit 2 receives the laser beam emitted by the laser and parallelizes it, the parallelized laser beam passes downward through the rotating shaft 5 in the center hole of the rotating shaft 5, and then enters the lower laser head unit 3 to be focused into a point to weld the workpiece to be welded. Since the rotating shaft 5 can move relative to the upper laser head unit 2 and the lower laser head unit 3, in order to avoid the laser beam being blocked by the rotating shaft 5 when the upper laser head unit 2 and the lower laser head unit 3 pass through, or the laser passes from the outside of the rotating shaft 5, the aperture of the center hole on the rotating shaft 5 in the utility model is set as large as possible, so that when the slide A4 moves to the two extreme positions along the X-axis direction, the parallelized laser beam of the upper laser head unit 2 still passes through the center hole of the rotating shaft 5 and enters downward When the lower laser head unit 3, i.e., the slide A4, moves to the maximum position along the positive direction of the X-axis, the projection of the upper laser head unit 2 on the horizontal plane is located within the projection of the center hole of the rotating shaft 5 on the horizontal plane. When the slide A4 moves to the maximum position along the negative direction of the X-axis, the projection of the upper laser head unit 2 on the horizontal plane is still located within the projection of the center hole of the rotating shaft 5 on the horizontal plane. The connecting seat A7 in the utility model is indirectly installed on the rotating shaft 5, and can be slidably adjusted on the Z axis and the Y axis relative to the rotating shaft 5, and the connecting seat A7 can move synchronously with the movement of the rotating shaft 5 in the X-axis direction. The arc welding gun 8 is installed on the connecting seat A7, and can be slidably adjusted on the connecting seat A7 along the X-axis direction. The laser tracker 9 is installed on the connecting seat B1.The laser tracker 9 and the arc welding gun 8 are respectively located on both sides of the laser head. The laser tracker 9 is used for weld seam positioning before welding and real-time weld seam tracking during welding.

[0021] like Figure 1 and Figure 2 As shown, in order to realize the sliding adjustment of the connecting seat A7 relative to the rotating shaft 5 in the Z-axis and Y-axis directions, the utility model is provided with a slide B10 and a slide C11. The slide B10 is installed on one side of the rotating shaft 5 and can slide on the rotating shaft 5 along the Z-axis direction. A dovetail groove B (not shown in the figure) is provided on the slide B10 along the Z-axis direction. A guide rail B matching the dovetail groove B is provided on the side of the rotating shaft 5 away from the laser tracker 9 along the Z-axis direction. Through the sliding cooperation between the guide rail B and the dovetail groove B, the slide B10 can slide in the Z-axis direction relative to the rotating shaft 5. The slide C11 is installed on the slide B10 and can slide on the slide B10 along the Y-axis direction. A dovetail groove C (not shown in the figure) is provided on the slide C11 along the Y-axis direction. A guide rail C matching the dovetail groove C is provided on the side of the slide B10 away from the rotating shaft 5 along the Y-axis direction. Through the sliding cooperation between the guide rail C and the dovetail groove C, the slide C11 can slide relative to the rotating shaft 5. The slide B10 slides in the Y-axis direction, and the connecting seat A7 is installed on the slide C11. The utility model has a mounting groove B on the connecting seat A7, and a mounting groove C communicating with the mounting groove B is opened on the open side of the mounting groove B, wherein the length direction of the mounting groove C is the same as the direction of the X-axis, and a fixing block 26 is arranged on the arc welding gun 8. Both sides of the fixing block 26 are installed in the mounting groove B by means of clamping bolts that pass through the mounting groove C and are threadedly matched with the fixing block 26. By loosening the clamping bolts, the arc welding gun 8 can be moved in the X-axis direction, and by tightening the clamping bolts, the fixing block 26 is clamped in the mounting groove B to fix the arc welding gun 8. In the utility model, the length of the mounting groove C along the X-axis direction is 15 mm, so the arc welding gun 8 can move within the range of 0-15 mm relative to the connecting seat A7, and the slide B10 in the utility model can move within the range of ±15 mm relative to the rotating shaft 5, and the slide C11 can be moved and adjusted within the range of ±5 mm relative to the slide B.

[0022] like Figure 1 and Figure 2As shown, the utility model is provided with a connecting plate 12 and a fixing device C13. The upper end of the connecting plate 12 is detachably mounted on the connecting seat B1 by at least two bolts. The laser tracker 9 is mounted on the lower part of the connecting plate 12. One end of the fixing device C13 is detachably mounted on the connecting plate 12 by at least two bolts. A circular mounting hole is provided on the end of the fixing device C13 away from the connecting seat B1. The lower laser head unit 3 is detachably mounted on the fixing device C13 by bolts, and the top end of the lower laser head unit 3 extends into the mounting hole. The utility model is provided with an arc-shaped mounting groove A14 at the lower part of the connecting plate 12. The laser tracker 9 is mounted on the connecting plate 12 by at least two fastening screws 15 passing through the mounting groove A14. Loosening the fastening screws 15 is used to adjust the angle of the laser tracker 9, and tightening the fastening screws 15 is used to fix the laser tracker 9.

[0023] like Figure 1 and Figure 2 As shown, the utility model is provided with a cooling device for cooling the lower laser head unit 3, and the cooling device includes a cooling water channel, a cooling water pipe joint A16 and a cooling water pipe joint B17 which are opened on the lower laser head unit 3. The cooling water channel in the utility model is spirally arranged on the lower laser head unit 3, such as using a water pipe wound on the lower laser head unit 3 to form the cooling water channel, the cooling water pipe joint A16 and the cooling water pipe joint B17 are respectively arranged at the lower end and the upper end of the cooling water channel, the cooling water pipe joint A16 is connected to the cooling water inlet pipe in the use state, and is used to pass cooling water into the cooling water channel, the cooling water flows in the cooling water channel to exchange heat with the lower laser head unit 3 to reduce the temperature of the lower laser head unit 3, and then is discharged from the cooling water outlet pipe connected to the cooling water pipe joint B17 in the use state, the utility model continuously passes cooling water into the cooling water channel in the use state, so as to continuously cool the lower laser head unit 3 and protect the lower laser head unit 3 from being damaged due to excessive temperature. The utility model is provided with an air pipe joint 18, which is arranged at the lower part of the lower laser head unit 3. The air pipe joint 18 is connected to the air pipe when in use, and the air pipe provides compressed gas. The compressed gas blown out from the air pipe joint 18 is used to blow away the smoke generated by welding during the welding process.

[0024] The utility model is provided with a fixing device A19 on the top of the connecting seat B1, the fixing device A19 is horizontal, and the slide A4 is slidably arranged on the fixing device A19. The fixing device A19 in the utility model can be integrally formed with the connecting seat B1, or the fixing device A19 can be detachably installed on the connecting seat B1. Figure 3As shown, in the utility model, one end of the bottom of the slide A4 is slidably connected with the fixing device A19, and the other end of the slide A4 protrudes downward to form a connecting boss 20, and a connecting hole 21 that runs through the slide A4 and the connecting boss 20 is opened at the connecting boss 20, and a rotating shaft groove 22 is provided on the hole wall of the connecting hole 21. A driven pulley is sleeved and fixed on the upper end of the rotating shaft 5, and there is no relative rotation between the driven pulley and the rotating shaft 5, that is, the driven pulley rotates synchronously with the rotating shaft 5. The driven pulley is located in the rotating shaft groove 22 and can rotate in the rotating shaft groove 22, and the rotating shaft 5 is axially limited to prevent the rotating shaft 5 from being separated from the slide A4, and the connecting boss 20 is close to the fixing device A1 A through slot 27 is provided on one side of 9, and the through slot 27 is communicated with the rotating shaft slot 22. A through hole 23 for the output shaft of the servo motor 6 to pass through is provided on one side of the slide A4 for sliding connection with the fixing device A19. The servo motor 6 is detachably mounted on the slide A4 by bolts. The output shaft of the servo motor 6 passes through the through hole 23, and a driving pulley is installed on the output shaft of the servo motor 6. The driving pulley and the driven pulley are connected by a synchronous belt passing through the through slot 27. The servo motor 6 drives the rotating shaft 5 to rotate through the synchronous belt. One end of the fixing device A19 extends through the through slot 27 and is provided with a circular hole for the laser beam to pass through. The laser head unit 2 is installed at the circular hole opened on the fixing device A19.

[0025] The utility model has a sliding groove (not shown in the figure) on the top of the fixing device A19 along the sliding direction of the slide A4, the driving pulley is located in the sliding groove, and when the slide A4 slides, the driving pulley moves in the sliding groove, a dovetail groove A24 is opened on the lower surface of the slide A4, and a guide rail A matching the dovetail groove A24 is arranged on both sides of the sliding groove on the fixing device A19, and the slide 4 is moved along the X-axis on the fixing device A19 through the relative sliding of the guide rail A and the dovetail groove A24. Direction sliding, the driving device A in the utility model is a screw, which is located between the two guide rails A and is rotatably connected to the fixing device A19. A protrusion (not shown in the figure) is fixed on the lower surface of the slide A4. The screw passes through the protrusion and cooperates with the protrusion thread. By rotating the screw, the slide A4 is driven to move on the fixing device A19. The driving structure for driving the slides B10 and C11 to slide in the utility model is the same as the driving structure for driving the slide A4 to slide, and the utility model will not elaborate on it.

[0026] When welding a workpiece with a requirement for symmetrical welding in the same direction, the utility model first welds a weld seam from the outside to the inside on the left or right side, adjusts the slide B10 and the slide C11 when the slide A4 is at the initial position, adjusts the position of the arc welding gun 8 relative to the laser head until the laser beam spot and the end of the welding wire are at the same point, moves the welding robot so that the laser beam spot and the end of the welding wire are aligned with the weld seam, adjusts the slide A4 so that the arc welding gun 8 moves horizontally relative to the laser head until a certain appropriate wire spacing, and the teaching pendant (which is arranged on the robot and is a prior art, not shown in the figure) controls the rotating shaft 5 to rotate the electric wire. Arc welding gun 8, so that a certain inclination angle is formed between the laser head and the arc welding gun 8, the filament spacing remains unchanged during the rotation process, and welding is performed after point teaching or line laser positioning. After the single-side welding is completed, the composite welding gun is moved to the other side, and the slide A4 is adjusted back to the default position, so that the laser beam spot and the end of the welding wire are aligned with the weld, and then the slide A4 position is moved until the filament spacing is the same as the previous weld, and the rotating shaft 5 is adjusted to make the arc welding gun 8 angle the same as the previous weld. The same tilt angle, point teaching or line laser positioning, welding from the outside to the inside can complete the symmetrical welding of the workpiece. The laser arc composite welding head of the utility model properly adjusts the parameters such as the filament spacing, defocusing amount and the tilt angle of the arc welding gun 8 before welding, so that the operability is enhanced when welding symmetrical welds in the same direction, and the appropriate welding posture makes the weld smooth and round, while reducing the probability of defects such as pores, undercuts and local unfusion.

[0027] The parts not specifically described in the above description are all prior art, or can be implemented by prior art. Moreover, the specific implementation cases described in this utility model are only preferred implementation cases of this utility model, and are not used to limit the implementation scope of this utility model. That is, all equivalent changes and modifications made according to the content of the patent scope of this utility model should be regarded as the technical scope of this utility model.

Claims

1. A laser arc hybrid welding joint for symmetrical welding, characterized in that: include A connecting base B (1), used for mounting on the robot when in use; A laser head, the laser head comprising an upper laser head unit (2) and a lower laser head unit (3), the upper laser head unit (2) being mounted on a connection base B (1) and connected to a laser when in use, the upper laser head unit (2) being provided with a collimating lens, the lower laser head unit (3) being mounted on the connection base B (1) and being provided with a focusing lens; The slide A (4) is mounted on the connecting seat B (1) and is driven by the driving device A to move along the X-axis direction on the connecting seat B (1); A rotating shaft (5), wherein a center hole is formed on the rotating shaft (5) and passes through the rotating shaft (5) from top to bottom. The top end of the rotating shaft (5) is rotatably arranged on a slide A (4) and is driven to rotate by a servo motor (6) mounted on the slide A (4). An upper laser head unit (2) and a lower laser head unit (3) are respectively located above and below the rotating shaft (5). The upper laser head unit (2) receives a laser beam emitted by a laser and parallelizes the laser beam, and passes the laser beam downward through the rotating shaft (5) and enters the lower laser head unit (3) to focus the laser beam into a point for welding a workpiece to be welded. When the slide A (4) moves to the two extreme positions along the X-axis direction, the laser beam parallelized by the upper laser head unit (2) still passes through the center hole of the rotating shaft (5) and enters the lower laser head unit (3) downward. A connecting seat A (7), the connecting seat A (7) is indirectly mounted on the rotating shaft (5) and can be slidably adjusted on the Z axis and the Y axis relative to the rotating shaft (5); An arc welding gun (8), the arc welding gun (8) is mounted on the connecting seat A (7), and can be slidably adjusted along the X-axis direction on the connecting seat A (7); A laser tracker (9) is mounted on the connection base B (1), and the laser tracker (9) and the arc welding gun (8) are respectively located on both sides of the laser head.

2. The laser arc hybrid welding joint for symmetrical welding according to claim 1 is characterized in that: Also includes A slide B (10), the slide B (10) is installed on one side of the rotating shaft (5) and can slide on the rotating shaft (5) along the Z-axis direction; The slide C (11) is mounted on the slide B (10) and can slide on the slide B (10) along the Y-axis direction. The connecting seat A (7) is mounted on the slide C (11).

3. The laser arc hybrid welding joint for symmetrical welding according to claim 1 is characterized in that: Also includes A connecting plate (12), the upper end of the connecting plate (12) being mounted on the connecting seat B (1), and the laser tracker (9) being mounted on the lower part of the connecting plate (12); A fixing device C (13), one end of which is mounted on the connecting plate (12), and a lower laser head unit (3) is mounted on an end of the fixing device C (13) away from the connecting plate (12).

4. The laser arc hybrid welding joint for symmetrical welding according to claim 3 is characterized in that: An arc-shaped mounting groove A (14) is formed at the bottom of the connecting plate (12). The laser tracker (9) is mounted on the connecting plate (12) by two or more fastening screws (15) passing through the mounting groove A (14). The fastening screws (15) are loosened to adjust the angle of the laser tracker (9).

5. The laser arc hybrid welding joint for symmetrical welding according to claim 1 is characterized in that: The invention also includes a cooling device, which includes a cooling water channel opened on the lower laser head unit (3), a cooling water pipe joint A (16) and a cooling water pipe joint B (17), wherein the cooling water pipe joint A (16) and the cooling water pipe joint B (17) are respectively arranged at the lower end and the upper end of the cooling water channel, and the cooling water pipe joint A (16) is connected to a cooling water inlet pipe in a use state to introduce cooling water into the cooling water channel, and after the cooling water cools the lower laser head unit (3), the cooling water is discharged from a cooling water outlet pipe connected to the cooling water pipe joint B (17) in the use state.

6. The laser arc hybrid welding joint for symmetrical welding according to claim 1 is characterized in that: It also comprises an air pipe joint (18), which is arranged at the lower part of the lower laser head unit (3). The air pipe joint (18) is connected to an air pipe when in use, and the air pipe provides compressed gas for blowing away smoke generated by welding during the welding process.

7. The laser arc hybrid welding joint for symmetrical welding according to claim 1 is characterized in that: A fixing device A (19) is arranged on the top of the connecting seat B (1), the fixing device A (19) is horizontal, and the slide table A (4) is slidably arranged on the fixing device A (19).

8. The laser arc hybrid welding joint for symmetrical welding according to claim 7 is characterized in that: One end of the bottom of the slide A (4) is slidably connected to the fixing device A (19), and the other end of the slide A (4) protrudes downward to form a connecting boss (20). A connecting hole (21) is provided at the connecting boss (20) and passes through the slide A (4) and the connecting boss (20) from top to bottom. A rotating shaft groove (22) is provided on the hole wall of the connecting hole (21). A driven pulley is sleeved and fixed on the top end of the rotating shaft (5). The driven pulley is located in the rotating shaft groove (22) and can be rotated on the rotating shaft. The connecting boss (20) is provided with a through slot (27) on one side close to the fixing device A (19), and a through hole (23) for the output shaft of the servo motor (6) to pass through is provided on one side of the slide A (4) for sliding connection with the fixing device A (19). A driving pulley is mounted on the output shaft of the servo motor (6), and the driving pulley and the driven pulley are connected by a synchronous belt passing through the through slot (27). The servo motor (6) drives the rotating shaft (5) to rotate through the synchronous belt.

9. The laser arc hybrid welding joint for symmetrical welding according to claim 8, characterized in that: A sliding groove is provided at the top of the fixing device A (19) along the sliding direction of the slide table A (4), the driving pulley is located in the sliding groove, and the driving pulley moves in the sliding groove while the slide table A (4) slides.

10. The laser arc hybrid welding joint for symmetrical welding according to claim 9, characterized in that: A dovetail groove A (24) is provided on the lower surface of the slide table A (4), and a guide rail A matching with the dovetail groove A (24) is provided on each side of the slide groove on the fixing device A (19).

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