A laser welding protection device for corrugated pipe production

Abstract

The present invention discloses a laser welding protection device for corrugated pipe production, comprising a welding table and a laser welding assembly. The laser welding assembly moves on the top of the welding table through a transmission beam. A welding workpiece is arranged inside the welding table through a lifting platform. The welding workpiece comprises a guide tube sleeved inside the corrugated pipe. A fixed boss is arranged on the top surface of the welding table, and a docking transmission mechanism is arranged inside the boss. The docking transmission mechanism comprises an electric actuator and a motor. When the electric actuator is started, eight groups of interference wheels can be driven to contact and dock with the outer surface of the corrugated pipe through a first driving assembly and a driving assembly. When the motor is started, the eight groups of interference wheels can be driven to rotate on the surface of the corrugated pipe through a second driving assembly and a driving assembly. A clamping mechanism is arranged on both sides of the bottom of the laser welding assembly. The present invention can effectively achieve stable clamping of the corrugated pipe and the guide tube, and at the same time can meet the rotation effect of the corrugated pipe during welding, thereby stabilizing the position of the welding gun.

Description

Technical Field

[0001] The invention relates to the technical field of welding clamping protection devices, in particular to a laser welding protection device for corrugated pipe production. Background Art

[0002] A bellows is a protective device used to connect pipelines. It can achieve deformation and elongation within a specific range. In the industrial field, it is also called a bellows compensator. The components of the bellows assembly are mainly divided into a bellows outer sleeve, a guide tube, and flanges connected to both sides of the bellows. In the actual assembly production process, it is also necessary to assemble and weld it.

[0003] Welding work is usually divided into welding between the bellows and the flange and welding between the bellows and the guide pipe. For the welding of the bellows and the guide pipe, since the guide pipe is inside the bellows, the following problems will occur during the actual welding process:

[0004] 1. The flexibility of the bellows makes it difficult for the clamping assembly to achieve a relatively stable clamping during the actual docking process with the guide tube. The deformation of the bellows and the inaccurate docking position of the guide tube will seriously affect the quality of laser welding;

[0005] Second, the clamping assembly during the bellows welding process needs to be manually adjusted and clamped, and the position is fixed and cannot be rotated after clamping. This requires a rotating welding gun assembly to weld the arc-shaped welding surface, which greatly increases the requirements for welding accuracy.

[0006] Therefore, how to provide a laser welding protection device for bellows production is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0007] One purpose of the present invention is to propose a laser welding protection device for bellows production. The present invention can effectively achieve stable clamping of the bellows and the guide tube, while satisfying the rotation effect of the bellows during welding, thereby stabilizing the position of the welding gun.

[0008] According to an embodiment of the present invention, a laser welding protection device for corrugated pipe production includes a welding table and a laser welding assembly. The laser welding assembly moves on the top of the welding table via a transmission beam. A welding workpiece is mounted inside the welding table via a lifting platform. The welding workpiece includes a guide tube sleeved inside the corrugated pipe. A boss is fixed on the top surface of the welding table, and a docking transmission mechanism is provided inside the boss.

[0009] The docking transmission mechanism includes an electric actuator and a motor. When the electric actuator is started, it can drive the eight sets of contact wheels to contact and dock with the outer surface of the corrugated pipe through the first drive component and the driving component. When the motor is started, it can drive the eight sets of contact wheels to rotate on the surface of the corrugated pipe through the second drive component and the driving component.

[0010] A clamping mechanism is provided on both sides of the bottom of the laser welding assembly, and the clamping mechanism includes two groups of side ear rods and connecting rods. The connecting rods slide up and down in the side ear rods, and a pressure spring is also provided between the side ear rods and the connecting rods. The connecting rods are elastically connected to the side ear rods through the pressure springs. The bottom of the connecting rod is transversely threaded with an adjusting bolt, and one end of the adjusting bolt is limited in rotation with a pressure wheel. The side ear rods are fixed to the side of the laser welding assembly, and the pressure wheel is in contact with the top surface of the guide pipe. The laser welding assembly drives the connecting rod to slide on the surface of the side ear rod and squeezes the pressure spring at the same time, so that the pressure wheel will provide a better resistance force for the guide pipe until the laser welding assembly is aligned with the gap between the bellows and the guide pipe.

[0011] Furthermore, the output end of the electric actuator is fixed with an engaging rod, one end of which is elastically connected to the boss via a return spring, and one side of the engaging rod is engaged with the first driving assembly.

[0012] Furthermore, the first drive assembly includes a first ring, eight groups of internal grooves and a single group of docking grooves, the docking grooves are fixed on the outer ring surface of the first ring, and the first ring is engaged with the engaging rod through the docking grooves, and several groups of internal groove annular arrays are fixed on the inner ring surface of the first ring, and the first ring is engaged with the driving teeth through the internal grooves.

[0013] Furthermore, the driving assembly includes a swing rod and two groups of mutually meshing transmission teeth, the two groups of transmission teeth are meshed with each other and are rotatably arranged at the bottom of the swing rod, one side of a single group of transmission teeth is meshed with the final gear, the top of the final gear is fixed to the interference wheel through a connecting shaft passing through the swing rod, one side of the single group of transmission teeth is meshed with the primary gear, the top of the primary gear rotates in the movable groove through a limit bearing, the movable groove is opened on one side of the bottom of the swing rod, and the top of one side of the swing rod is fixed to the driving gear.

[0014] Furthermore, one side of the top of the swing arm is rotationally limited by a connecting shaft and a boss, and the axis of the connecting shaft on the surface of the swing arm coincides with the primary meshing teeth and the driving meshing teeth.

[0015] Furthermore, the second drive component includes a second ring, a continuous vortex groove and a continuous inner groove, and the continuous vortex groove and the continuous inner groove are respectively arranged on the outer ring and the inner ring of the second ring. The second ring is engaged with the vortex rod on the motor output shaft through the continuous vortex groove, and the second ring is engaged with the primary meshing tooth through the continuous inner groove.

[0016] Furthermore, a support assembly is arranged between the first drive assembly and the second drive assembly, and the support assembly includes a partition plate, two groups of annular grooves and several groups of supporting balls. The two groups of annular grooves are respectively opened on the upper and lower sides of the partition plate, and annular grooves are opened on the upper and lower sides of the second ring ring and the first ring ring near the annular grooves.

[0017] Furthermore, a plurality of groups of supporting balls are arranged in a rolling manner in the annular groove, and the first ring and the second ring are respectively connected to the partition plate through limited rotation between the supporting balls.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a second driving assembly and a driving assembly. After the motor is started, the worm gear can directly drive the second ring to rotate stably in the support assembly, and the continuous inner groove at the inner ring position of the second ring can effectively drive the primary meshing teeth in the driving assembly to rotate in the movable groove at the bottom of the swing rod. Under the transmission effect of the transmission meshing teeth, the final meshing teeth directly drive the interference wheel to rotate, and the interference wheel then interferes with the outer ring position of the bellows, thereby achieving synchronous rotation of multiple groups of interference wheels to drive the bellows to rotate stably at the bottom of the laser welding assembly, so as to realize rotary welding operation.

[0020] The present invention provides a first driving assembly and a driving assembly. After the electric actuator is started, the meshing rod is directly driven to move laterally in the boss, and one side of the meshing rod is meshed with the docking groove. At the same time, the first ring is rotated as a whole under the limit of the support assembly. At this time, the internal meshing groove at the inner ring of the first ring rotates synchronously, driving the driving meshing teeth engaged therewith to rotate, and driving the meshing teeth fixed to the top of one side of the swing rod, so that the swing rod swings with the driving meshing teeth as the center of the circle, driving the interference wheel on one side to fit the outer side of the bellows to achieve a clamping effect. Conversely, under the elastic action of the return spring, the multiple groups of interference wheels can be loosened to the bellows, thereby facilitating the removal of the bellows and the guide tube.

[0021] The present invention provides a clamping mechanism on both sides of the laser welding assembly. When the laser welding assembly is driven to move downward, the connecting rod will be driven to move downward synchronously, so that the pressure wheel contacts the top of the guide pipe. At this time, the laser welding assembly continues to descend, and the connecting rod is subjected to resistance to compress the pressure spring between the side ear rod and the connecting rod, realizing elastic deformation of the pressure spring, thereby providing the pressure wheel with a stable resistance force on the guide pipe, ensuring stable contact between the guide pipe and the corrugated pipe, and ensuring welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1This is a schematic diagram of the overall structure of a laser welding protection device for bellows production proposed by the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the boss of a laser welding protection device for corrugated pipe production proposed by the present invention.

[0025] Figure 3 This is a schematic diagram of the connection structure of the clamping mechanism of a laser welding protection device for corrugated pipe production proposed by the present invention.

[0026] Figure 4 This is a schematic diagram of the connection of the transmission mechanism of the laser welding protection device for corrugated pipe production proposed by the present invention.

[0027] Figure 5 This is a schematic diagram of the disassembled structure of the docking transmission mechanism of a laser welding protection device for corrugated pipe production proposed by the present invention.

[0028] Figure 6 This is a schematic diagram of the external structure of the boss of a laser welding protection device for corrugated pipe production proposed by the present invention.

[0029] Figure 7 This is a schematic diagram of the connection structure of the components of a laser welding protection device for corrugated pipe production proposed by the present invention.

[0030] Figure 8 A laser welding protection device for corrugated pipe production proposed by the present invention Figure 2 A magnified schematic diagram of the structure at point A.

[0031] In the figure: 1. Welding table; 2. Laser welding assembly; 3. Welding workpiece; 4. Lifting table; 5. Boss; 6. Clamping mechanism; 7. Docking transmission mechanism; 8. Interference wheel;

[0032] 31. Bellows; 32. Flow guide tube; 61. Side ear rod; 62. Connecting rod; 63. Pressure spring; 64. Adjusting bolt; 65. Pressure wheel; 71. Electric actuator; 72. Motor; 73. Engaging rod; 74. First drive assembly; 75. Second drive assembly; 76. Turbine rod; 77. Return spring; 78. Support assembly; 79. Driving assembly;

[0033] 741. First ring; 742. Internal meshing groove; 743. Docking meshing groove; 751. Second ring; 752. Continuous vortex groove; 753. Continuous internal groove; 781. Partition plate; 782. Annular groove; 783. Support ball; 791. Swing rod; 792. Final meshing teeth; 793. Transmission meshing teeth; 794. Primary meshing teeth; 795. Movable notch; 796. Driving meshing teeth. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0035] refer to Figures 1-8 , including a welding table 1 and a laser welding assembly 2. The laser welding assembly 2 moves on the top of the welding table 1 through a transmission beam. A welding workpiece 3 is supported inside the welding table 1 through a lifting platform 4. The welding workpiece 3 includes a guide tube 32 sleeved inside a bellows 31. A boss 5 is fixed on the top surface of the welding table 1. A docking transmission mechanism 7 is provided inside the boss 5.

[0036] The docking transmission mechanism 7 includes an electric actuator 71 and a motor 72. When the electric actuator 71 is started, it can drive the eight sets of contact wheels 8 to contact and dock with the outer surface of the corrugated tube 31 through the first drive component 74 and the drive component 79. When the motor 72 is started, it can drive the eight sets of contact wheels 8 to rotate on the surface of the corrugated tube 31 through the second drive component 75 and the drive component 79.

[0037] A clamping mechanism 6 is provided on both sides of the bottom of the laser welding assembly 2. The clamping mechanism 6 includes two groups of side ear rods 61 and a connecting rod 62. The connecting rod 62 slides up and down in the side ear rod 61. A pressure spring 63 is also provided between the side ear rod 61 and the connecting rod 62. The connecting rod 62 is elastically connected to the side ear rod 61 through the pressure spring 63. The bottom of the connecting rod 62 is horizontally threaded with an adjusting bolt 64. One end of the adjusting bolt 64 is limited in rotation with a pressure wheel 65. The side ear rod 61 is fixed to the side of the laser welding assembly 2. The pressure wheel 65 is in contact with the top surface of the guide tube 32. The laser welding assembly 2 drives the connecting rod 62 to slide on the surface of the side ear rod 61, and at the same time squeezes the pressure spring 63, so that the pressure wheel 65 will provide a better resistance force to the guide tube 32 until the laser welding assembly 2 is aligned with the gap between the bellows 31 and the guide tube 32.

[0038] In this embodiment, the lifting platform 4 directly provides support for the bellows 31 and the guide tube 32 at the bottom of the welding platform 1, and at the same time satisfies the need for vertical adjustment to achieve the effect of material discharge. The movable effect of the laser welding assembly 2 on the top of the welding platform 1 satisfies the need for horizontal and vertical movement in the vertical plane to achieve alignment of the welding gun tip with the gap between the guide tube 32 and the bellows 31.

[0039] When the electric actuator 71 and the motor 72 in the docking transmission mechanism 7 are respectively started, the start of the electric actuator 71 can drive the interference wheel 8 to move closer to the outside of the bellows 31 through the first drive component 74 and the driving component 79 until the interference wheel 8 contacts the outside of the bellows 31. During the rotation process, the first drive component 74 can synchronously drive the multiple groups of interference wheels 8 to move synchronously, thereby achieving the clamping effect of the multiple groups of interference wheels 8 on the bellows 31.

[0040] The start of the motor 72 directly drives the interference wheel 8 to rotate through the connection effect of the second driving component 75 and the driving component 79. The interference wheel 8 is now in contact with the outside of the bellows 31. Under the action of the interference force, the rotation of the interference wheel 8 can drive the entire bellows 31 to rotate, so as to change the docking position with the laser welding component 2 and realize the arc continuous welding operation.

[0041] A clamping mechanism 6 is provided at the bottom of the laser welding assembly 2. When the laser welding assembly 2 contacts the guide tube 32 downward, the continuous downward effect will drive the clamping mechanism 6 to squeeze the guide tube 32, so that the guide tube 32 can effectively maintain the interference and docking effect with the bellows 31, thereby ensuring the actual welding quality.

[0042] refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 8 The output end of the electric actuator 71 is fixed to a rod 73. One end of the rod 73 is elastically connected to the boss 5 via a return spring 77. One side of the rod 73 engages with the first drive assembly 74. The first drive assembly 74 includes a first ring 741, eight sets of internal meshing grooves 742, and a single set of docking grooves 743. The docking grooves 743 are fixed to the outer surface of the first ring 741, and the first ring 741 and the rod 73 engage with each other through the docking grooves 743. Several sets of internal meshing grooves 742 are fixed to the inner surface of the first ring 741 in an annular array. The first ring 741 engages with the driving teeth 796 through the internal meshing grooves 742.

[0043] In this embodiment, after being started, the electric actuator 71 directly drives the meshing rod 73 to move laterally inside the boss 5, and one side of the meshing rod 73 engages with the docking groove 743 and the meshing rod 73. When the meshing rod 73 moves, the first ring 741 as a whole is restricted by the support component 78 and will engage and rotate, so that the inner meshing groove 742 of the inner ring of the first ring 741 can engage and transmit with the driving teeth 796, driving the driving component 79 to swing, thereby driving the interference wheel 8 to contact and fit with the surface of the bellows 31. Conversely, under the elastic resistance force of the reset spring 77, the interference wheel 8 can also achieve a separation and reset operation with the bellows 31.

[0044] refer to Figure 4 and Figure 7The driving assembly 79 includes a swinging rod 791 and two sets of intermeshing transmission teeth 793. The two sets of transmission teeth 793 are intermeshed and rotatably disposed at the bottom of the swinging rod 791. One side of a single set of transmission teeth 793 engages with a final gear 792. The top of the final gear 792 is fixed to the contact wheel 8 via a coupling that passes through the swinging rod 791. One side of the single set of transmission teeth 793 engages with a primary gear 794. The top of the primary gear 794 rotates within a movable notch 795 via a limit bearing. The movable notch 795 is provided on one side of the bottom of the swinging rod 791. A driving gear 796 is fixed to the top of one side of the swinging rod 791. The top side of the swinging rod 791 is rotationally limited by a coupling and a boss 5. The axis of the coupling on the surface of the swinging rod 791 coincides with the primary gear 794 and the driving gear 796.

[0045] In this embodiment, the driving gear 796 is fixed on the top of one side of the swing rod 791, and the axis of this position is movably limited to the boss 5, so that when the driving gear 796 is driven by the internal groove 742, the swing rod 791 rotates as a whole, thereby driving the interference wheel 8 to change its position, and the bottom of the interference wheel 8 passes through the swing rod 791 through the connecting shaft and is fixed to the final gear 792. One side of the final gear 792 is engaged with the transmission gear 793, and the other side of the transmission gear 793 is engaged with the primary gear 794. The primary gear 794 here is movable at the bottom of the swing rod 791 through the movable groove 795. Its rotation will not drive the swing rod 791 to move, but directly drive the interference wheel 8 to rotate through the meshing effect of the transmission gear 793 and the final gear 792.

[0046] refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 8 The second drive assembly 75 includes a second ring 751, a continuous vortex groove 752 and a continuous inner groove 753. The continuous vortex groove 752 and the continuous inner groove 753 are respectively arranged on the outer ring and inner ring of the second ring 751. The second ring 751 is engaged with the vortex rod 76 on the output shaft of the motor 72 through the continuous vortex groove 752, and the second ring 751 is engaged with the primary meshing teeth 794 through the continuous inner groove 753.

[0047] In this embodiment, the continuous vortex groove 752 on the outer ring of the second ring 751 directly engages with the vortex rod 76 on the output shaft of the motor 72. In this way, when the motor 72 is started, the rotation of the vortex rod 76 will directly drive the second ring 751 to rotate. At this time, the continuous inner groove 753 at the inner ring position of the second ring 751 will also rotate synchronously, and the continuous inner groove 753 will directly engage with the primary meshing teeth 794, thereby driving the interference wheel 8 to rotate.

[0048] refer to Figure 2 and Figure 6A support assembly 78 is disposed between the first drive assembly 74 and the second drive assembly 75. The support assembly 78 comprises a partition plate 781, two sets of annular grooves 782, and a plurality of sets of support balls 783. The two sets of annular grooves 782 are respectively provided on the upper and lower sides of the partition plate 781. Annular grooves are provided on the upper and lower sides of the second ring 751 and the first ring 741 near the annular grooves 782. The plurality of sets of support balls 783 are rollably disposed within the annular grooves 782. The first ring 741 and the second ring 751 are respectively rotationally connected to the partition plate 781 via the support balls 783.

[0049] In this embodiment, the bellows 31 and the guide tube 32 are provided at the inner ring positions of the first drive assembly 74 and the second drive assembly 75. Therefore, the rotation of the first drive assembly 74 and the second drive assembly 75 needs to be stabilized by the support of the support assembly 78.

[0050] The partition plate 781 is directly located between the first ring 741 and the second ring 751, and an annular groove 782 is provided on its surface. The groove shape of the annular groove 782 is consistent with the path of the first ring 741 and the second ring 751, and a supporting ball 783 is also provided therein. In this way, the supporting ball 783 between the first ring 741 and the second ring 751 and the annular groove 782 can provide better stability and limiting capabilities, preventing the first ring 741 and the second ring 751 from deflecting and offsetting during rotation.

[0051] When the laser welding assembly 2 is driven to move downward, the pressure wheel 65 in the clamping mechanism 6 will first contact the surface of the guide tube 32. At this time, the continuous downward effect will drive the connecting rod 62 to slide on the surface of the side ear rod 61, and at the same time squeeze the pressure spring 63. At this time, the pressure wheel 65 connected to the bottom of the connecting rod 62 by the adjusting bolt 64 will provide a better resistance force to the guide tube 32, thereby preventing the bellows 31 and the guide tube 32 from detaching, until the laser welding assembly 2 is aligned with the gap between the bellows 31 and the guide tube 32.

[0052] Working principle: First, place the bellows 31 and the guide tube 32 on the lifting platform 4, and adjust the height by the lifting platform 4. Then, the electric actuator 71 in the transmission mechanism 7 on the inner side of the boss 5 is driven first. The electric actuator 71 drives the sleeve meshing rod 73 to move laterally while squeezing the reset spring 77 and drives the first ring 741 to rotate on the inner ring of the boss 5 through the docking meshing groove 743, so that the inner meshing groove 742 at the inner ring position of the first ring 741 engages with the driving meshing tooth 796 at the top of the swing rod 791, thereby realizing the swing rod 791 driving the friction The wheel 8 is aligned with the outside of the bellows 31, and then the motor 72 is started. The motor 72 directly drives the vortex rod 76 to rotate, and the continuous vortex groove 752 is forced to realize the overall rotation of the second ring 751. The continuous inner groove 753 and the primary gear 794 are meshed with each other, so that it rotates in the movable notch 795 at the bottom of the swing rod 791. At this time, the primary gear 794 directly drives the final gear 792 to rotate through the transmission gear 793, and the final gear 792 is fixed to the bottom of the interference wheel 8, so that the interference wheel 8 rotates at this time, thereby driving the bellows 31 to rotate;

[0053] Prior to this, the laser welding assembly 2 is driven to move downward on the top of the welding table 1, so that the pressure wheel 65 in the clamping mechanism 6 first contacts the top of the guide tube 32 inside the bellows 31. Then, the laser welding assembly 2 continues to descend, and the connecting rod 62 receives pressure and slides inside the side ear rod 61 and compresses the pressure spring 63. At this time, the pressure wheel 65 on the side of the adjusting bolt 64 provides a good downward pressure on the guide tube 32, thereby stabilizing the bellows 31 and the guide tube 32.

[0054] Finally, the rotation of the first ring 741 and the second ring 751 is restricted by the support assembly 78, and a support ball 783 is provided in the ring groove 782 opened on the surface of the partition plate 781. The support ball 783 limits the first ring 741 and the second ring 751, thereby preventing the first ring 741 and the second ring 751 from rotating and deviating.

[0055] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A laser welding protection device for corrugated pipe production, characterized in that: The invention comprises a welding platform (1) and a laser welding assembly (2), wherein the laser welding assembly (2) moves on the top of the welding platform (1) via a transmission beam, a welding workpiece (3) is mounted inside the welding platform (1) via a lifting platform (4), and the welding workpiece (3) comprises a guide tube (32) sleeved inside a bellows (31), a boss (5) is fixed on the top surface of the welding platform (1), and a docking transmission mechanism (7) is arranged inside the boss (5); The docking transmission mechanism (7) includes an electric actuator (71) and a motor (72). When the electric actuator (71) is started, it can drive the eight sets of contact wheels (8) to contact and dock with the outer surface of the corrugated tube (31) through the first drive component (74) and the drive component (79). When the motor (72) is started, it can drive the eight sets of contact wheels (8) to rotate on the surface of the corrugated tube (31) through the second drive component (75) and the drive component (79). A clamping mechanism (6) is provided on both sides of the bottom of the laser welding assembly (2), and the clamping mechanism (6) includes two groups of side ear rods (61) and a connecting rod (62). The connecting rod (62) slides up and down in the side ear rod (61). A pressure spring (63) is also provided between the side ear rod (61) and the connecting rod (62). The connecting rod (62) is elastically connected to the side ear rod (61) through the pressure spring (63). The bottom of the connecting rod (62) is transversely threaded with an adjusting bolt (64). The adjusting bolt (64) A pressure wheel (65) is provided at one end for limited rotation. The side ear rod (61) is fixed on the side of the laser welding assembly (2). The pressure wheel (65) contacts and docks with the top surface of the guide tube (32). The laser welding assembly (2) drives the connecting rod (62) to slide on the surface of the side ear rod (61) and squeezes the pressure spring (63) at the same time, so that the pressure wheel (65) provides a better resistance force to the guide tube (32) until the laser welding assembly (2) is aligned with the gap between the bellows (31) and the guide tube (32).

2. A laser welding protection device for corrugated pipe production according to claim 1, characterized in that: The output end of the electric actuator (71) is fixed with a meshing rod (73), one end of which is elastically connected to the boss (5) via a return spring (77), and one side of the meshing rod (73) is engaged with the first driving assembly (74).

3. A laser welding protection device for corrugated pipe production according to claim 2, characterized in that: The first driving assembly (74) includes a first ring (741), eight groups of inner meshing grooves (742) and a single group of docking meshing grooves (743), wherein the docking meshing grooves (743) are fixed on the outer ring surface of the first ring (741), and the first ring (741) and the meshing rod (73) are meshed with each other through the docking meshing grooves (743), and a plurality of groups of inner meshing grooves (742) are fixed in an annular array on the inner ring surface of the first ring (741), and the first ring (741) is meshed with the driving teeth (796) through the inner meshing grooves (742).

4. A laser welding protection device for corrugated pipe production according to claim 3, characterized in that: The driving assembly (79) includes a swing rod (791) and two groups of mutually meshing transmission teeth (793). The two groups of transmission teeth (793) are meshed with each other and are rotatably arranged at the bottom of the swing rod (791). One side of the single group of transmission teeth (793) is meshed with the final gear (792). The top of the final gear (792) is fixed to the contact wheel (8) through a connecting shaft passing through the swing rod (791). One side of the single group of transmission teeth (793) is meshed with the primary gear (794). The top of the primary gear (794) rotates in a movable notch (795) through a limit bearing. The movable notch (795) is opened on one side of the bottom of the swing rod (791). The top of one side of the swing rod (791) is fixed with the driving gear (796).

5. The laser welding protection device for corrugated pipe production according to claim 4, characterized in that: One side of the top of the swing rod (791) is rotationally limited by a connecting shaft and a boss (5), and the axis of the connecting shaft on the surface of the swing rod (791) coincides with the primary meshing teeth (794) and the driving meshing teeth (796).

6. The laser welding protection device for corrugated pipe production according to claim 4, characterized in that: The second driving assembly (75) includes a second ring (751), a continuous vortex groove (752) and a continuous inner groove (753), wherein the continuous vortex groove (752) and the continuous inner groove (753) are respectively arranged on the outer ring and the inner ring of the second ring (751), and the second ring (751) is engaged with the vortex rod (76) on the output shaft of the motor (72) through the continuous vortex groove (752), and the second ring (751) is engaged with the primary meshing teeth (794) through the continuous inner groove (753).

7. A laser welding protection device for corrugated pipe production according to claim 6, characterized in that: A support assembly (78) is provided between the first drive assembly (74) and the second drive assembly (75), and the support assembly (78) includes a partition plate (781), two groups of annular grooves (782) and a plurality of groups of supporting balls (783). The two groups of annular grooves (782) are respectively provided on the upper and lower sides of the partition plate (781), and annular grooves are provided on the upper and lower sides of the second ring (751) and the first ring (741) near the annular grooves (782).

8. The laser welding protection device for corrugated pipe production according to claim 7, characterized in that: A plurality of groups of supporting balls (783) are rollingly arranged in the annular groove (782), and the first ring (741) and the second ring (751) are respectively connected to the partition plate (781) through limited rotation between the supporting balls (783).

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