Laser welding device and process for limo production

Abstract

The invention relates to the technical field of laser welding, and discloses a laser welding device and process for limo production, the laser welding device for limo production comprises a laser welding gun main body, and further comprises a fixing cylinder and a heat dissipation cylinder which are in sliding sleeve connection with each other, and one side of the fixing cylinder is provided with a negative pressure part; a connecting pipe is jointly connected between the negative pressure part and the heat dissipation barrel, the end, away from the heat dissipation barrel, of the fixed barrel is fixedly communicated with a negative pressure pipe, and the other end of the negative pressure pipe is connected with external negative pressure equipment. The negative pressure part is attached with the skin when moving along with the laser welding gun at the same time, the pre-tightening effect on the skin of the area to be welded is achieved, the welding gap between the framework and the skin is reduced under the condition that spot welding positioning is not needed in advance, the welding technology is simplified, the welding efficiency is improved, meanwhile, negative pressure airflow can efficiently take away heat generated by a gun barrel in the process, and the welding quality is improved. The heat accumulation phenomenon of the gun barrel is reduced, the welding working time is prolonged, and the service life of optical elements is prolonged.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to a laser welding apparatus and process for the production of recreational vehicles. Background Technology

[0002] As the RV manufacturing industry continues to demand lighter weight, higher strength, and better aesthetics, the welding process for aluminum alloy frames and aluminum skins has become a critical step. Against this backdrop, handheld laser welding guns, due to their high flexibility, low heat input, and aesthetically pleasing welds, are increasingly being used in RV body manufacturing, particularly suitable for localized welding and repair of large, non-standard workpieces.

[0003] However, laser welding has extremely stringent requirements for assembly clearance. To ensure a tight fit between the long RV's skin and internal frame to meet these clearance requirements, operators must first perform multi-point, precise pre-fixation using spot welding. This auxiliary process of "spot welding for positioning, then continuous welding" brings multiple inconveniences and negative impacts. First, it adds extra steps, dividing the welding process and significantly increasing the overall welding time, thus reducing production efficiency. Second, spot welding itself consumes time and energy and may leave weld points on the skin surface that require subsequent processing, affecting the consistency of the appearance. Simultaneously, this cumbersome pre-positioning process indirectly increases welding operation time, meaning that the laser and barrel optical system are continuously operating under high load for an extended period, leading to a more severe heat accumulation effect. Continuous overheating not only accelerates the aging and contamination of optical components such as protective lenses and focusing lenses inside the barrel, affecting beam quality and welding results, but also directly threatens the lifespan and operational reliability of the laser, becoming a key pain point restricting production continuity and equipment investment return. Summary of the Invention

[0004] Given the problems of existing technologies, such as the complex welding process between the frame and skin resulting in low welding efficiency, and the potential for overheating of the laser welding gun and damage to optical components, a laser welding device for RV production is proposed.

[0005] The purpose is to install a follow-up negative pressure component on the laser welding gun. The negative pressure component moves with the laser welding gun to adsorb and position the skin, simplifying the welding process between the frame and the skin. At the same time, the negative pressure airflow dissipates heat from the gun barrel, extending the life of the laser welding gun.

[0006] The technical solution of the present invention is a laser welding device for RV production, including a laser welding gun body, a fixed cylinder and a heat dissipation cylinder that are slidably sleeved together. The heat dissipation cylinder is sleeved on the outside of the gun barrel of the laser welding gun body. The end of the heat dissipation cylinder near the gun head of the laser welding gun body is sealed and connected to the laser welding gun body. One end of the fixed cylinder is connected and fixed to the gun body of the laser welding gun body. A negative pressure component is provided on one side of the fixed cylinder. The negative pressure component and the heat dissipation cylinder are connected together by a connecting pipe. The negative pressure pipe is fixedly connected to the end of the fixed cylinder away from the heat dissipation cylinder. The other end of the negative pressure pipe is connected to an external negative pressure device. The negative pressure component includes a negative pressure cover. The opening end of the negative pressure cover has multiple fine grooves that are evenly spaced in a ring. The other end of the negative pressure cover is connected to a connecting ring, and the other end of the connecting ring is connected to an end cap. A sealing cap is fixedly connected to one side of the end cap. The sealing cap communicates with the connecting pipe, and a support frame is connected between the end cap and the fixed cylinder. The support frame is used to adjust the orientation of the negative pressure component.

[0007] Furthermore, a heat-absorbing ring with a spiral structure is fixedly connected to the inner wall of the heat dissipation cylinder.

[0008] Furthermore, one end of the support frame is hinged to the end cap, and the other end of the support frame is hinged to a connecting seat. The connecting seat is fixedly connected to the outer wall of the fixed cylinder, and a bolt is inserted between the connecting seat and the support frame. One end of the bolt is threaded with a wing nut.

[0009] Furthermore, a connecting pipe is rotatably connected inside the negative pressure cover, and the other end of the connecting pipe movably passes through the end cover and extends into the sealing cover. An impeller connected to the end of the connecting pipe is provided inside the negative pressure cover, and a fan blade connected to the outer wall of the connecting pipe is provided inside the end cover. An air inlet pipe is fixedly connected to the connecting ring, and an air collection hood is fixedly connected to the other end of the air inlet pipe. An air outlet pipe is fixedly connected to the end cover, and an exhaust hood is fixedly connected to the other end of the air outlet pipe.

[0010] Furthermore, the impeller includes an annular plate that is fixedly connected to the connecting pipe. A wind guide shroud is provided on the side of the annular plate facing the negative pressure cover port. Multiple wind guide plates are connected between the wind guide shroud and the annular plate, and the multiple wind guide plates are arranged in a ring with equal spacing.

[0011] Furthermore, a sealed bearing is connected between the outer wall of the connecting pipe and the side wall of the negative pressure cover.

[0012] Furthermore, the connecting ring is threadedly connected to the negative pressure cover and the end cover.

[0013] Furthermore, the fixed cylinder has a convex structure, and an adjusting ring is rotatably connected to the outer wall of the large end of the fixed cylinder. Multiple through holes are opened in a ring at equal intervals on both the large end of the fixed cylinder and the adjusting ring. An adjusting handle is fixedly connected to the adjusting ring, and a spring is connected between the adjusting handle and the fixed cylinder.

[0014] Another objective of this invention is to provide a laser welding process for RV production, wherein the skin can be adsorbed by a negative pressure component moving with the laser welding gun, thereby reducing the gap between the fastener and the skin, eliminating the spot welding positioning step, and the negative pressure airflow dissipates heat through the gun tube.

[0015] To achieve the above objectives, the present invention provides the following technical solution: a laser welding process for RV production, comprising the following steps: S1. Place the RV frame on the welding table, cut the corresponding skin according to the frame size, cover the frame with the skin and clamp it in place. S2. The welding head of the laser welding gun body is aligned with the connection between the skeleton and the skin, and the negative pressure cover port surface is in contact with the skin. The negative pressure equipment is started and laser welding is performed. S3. After welding is completed, turn the adjustment handle to cancel the negative pressure of the negative pressure cover and remove the laser welding gun body; S4. Use a wire brush to lightly clean the oxides from the weld surface and visually inspect it. Finally, apply high-performance sealant to the weld.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the negative pressure component moves simultaneously with the laser welding gun, the attached skin achieves a pre-tightening effect on the skin of the area to be welded. This reduces the welding gap between the frame and the skin without the need for pre-spot welding positioning, simplifies the welding process, and improves welding efficiency. At the same time, the negative pressure airflow can efficiently remove the heat generated by the gun barrel during the process, reducing the heat accumulation phenomenon in the gun barrel, increasing the welding working time and the service life of optical components.

[0017] 2. The kinetic energy of the negative pressure airflow is used to create airflow in the inlet and outlet pipes, which can quickly remove heat from the welded area, prevent the skin from deforming at high temperatures, and improve the welding quality. At the same time, the heat is blown towards the area to be welded, removing debris and preheating the area, thereby further shortening the welding time.

[0018] 3. The rotation of the adjusting ring can adjust the air intake direction of the fixed cylinder, thereby quickly cutting off the suction effect of the negative pressure component. This eliminates the need to wait for the equipment to depressurize, allowing the laser welding gun to be quickly transferred to the next welding area, effectively reducing process connection time and further improving welding efficiency. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the laser welding device for RV production according to the present invention; Figure 2 This is a cross-sectional schematic diagram of the heat dissipation cylinder and the fixing cylinder structure of the laser welding device for RV production according to the present invention. Figure 3 This is a schematic diagram of the heat sink, support frame, and negative pressure component of the laser welding device for RV production according to the present invention. Figure 4 This is a schematic diagram showing the disassembled structure of the negative pressure component of the laser welding device for RV production according to the present invention; Figure 5 This is a schematic cross-sectional view of the negative pressure component structure of the laser welding device for RV production according to the present invention; Figure 6 This is a schematic diagram of the negative pressure cover and impeller structure of the laser welding device for RV production according to the present invention; Figure 7 This is a disassembled schematic diagram of the connecting ring structure of the laser welding device for RV production according to the present invention.

[0020] In the picture: 1. Laser welding gun body; 2. Fixing cylinder; 3. Heat dissipation cylinder; 4. Negative pressure component; 41. Negative pressure cover; 42. Fine groove; 43. Connecting ring; 44. End cap; 45. Sealing cap; 5. Connecting pipe; 6. Negative pressure pipe; 7. Heat absorption ring; 8. Support frame; 9. Connecting seat; 10. Bolt; 11. Wing nut; 12. Connecting pipe; 13. Impeller; 131. Annular plate; 132. Air guide hood; 133. Air guide plate; 14. Fan blade; 15. Air inlet pipe; 16. Air collection hood; 17. Air outlet pipe; 18. Exhaust hood; 19. Sealed bearing; 20. Adjusting ring; 21. Through hole; 22. Adjusting handle; 23. Spring. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Example 1, referring to Figures 1-6This invention provides a laser welding device for RV production, comprising a laser welding gun body 1, a fixed cylinder 2 and a heat dissipation cylinder 3 slidably sleeved together, the heat dissipation cylinder 3 being sleeved on the outside of the gun barrel of the laser welding gun body 1, the end of the heat dissipation cylinder 3 near the gun head of the laser welding gun body 1 being sealed to the laser welding gun body 1, one end of the fixed cylinder 2 being connected and fixed to the gun body of the laser welding gun body 1, a negative pressure component 4 being provided on one side of the fixed cylinder 2, and a connecting pipe 5 being connected between the negative pressure component 4 and the heat dissipation cylinder 3. A negative pressure pipe 6 is fixedly connected to one end away from the heat sink 3, and the other end of the negative pressure pipe 6 is connected to an external negative pressure device; the negative pressure component 4 includes a negative pressure cover 41, the opening end of the negative pressure cover 41 is provided with a plurality of fine grooves 42 at equal intervals in an annular shape, the other end of the negative pressure cover 41 is connected to a connecting ring 43, the other end of the connecting ring 43 is connected to an end cap 44, a sealing cover 45 is fixedly connected to one side of the end cap 44, the sealing cover 45 is connected to the connecting pipe 5, and a support frame 8 is connected between the end cap 44 and the fixed cylinder 2, the support frame 8 is used to adjust the orientation of the negative pressure component 4.

[0023] Specifically, the fixed cylinder 2 and the heat dissipation cylinder 3 are adjusted in length through sliding cooperation, which can precisely match the barrel length of the laser welding gun body 1. The rotating support frame 8 can flexibly adjust the orientation of the negative pressure component 4. When the nozzle of the laser welding gun body 1 is aligned with the gap between the skeleton and the skin, the port face of the negative pressure cover 41 can be tightly attached to the skin surface. After the external negative pressure equipment is started, the negative pressure pipe 6, the fixed cylinder 2, the heat dissipation cylinder 3, and the connecting pipe 5 form a linkage negative pressure channel, which allows a stable negative pressure environment to be quickly established inside the negative pressure cover 41, thereby adsorbing the skin. When the laser welding gun body 1 maintains its working posture, the skin, under the continuous suction, can make the welding area fit tightly with the skeleton, effectively reducing or even eliminating the gap between the two. No additional pretreatment of the fit is required, which significantly simplifies the welding process and improves welding efficiency and joint quality. Meanwhile, outside air continuously enters the interior of the negative pressure component 4 through the fine groove 42, flows through the heat dissipation cylinder 3 and the fixed cylinder 2 in sequence along the negative pressure channel and is then discharged. During the flow, the heat generated by the laser welding gun body 1 is efficiently carried away, greatly reducing the heat accumulation phenomenon of the gun tube, avoiding the high temperature from affecting the welding accuracy, and extending the continuous working time and service life of the equipment.

[0024] Understandably, the end face of the negative pressure cover 41 is smoothed to minimize the friction with the skin, so that the laser welding gun body 1 can smoothly drive the negative pressure component 4 to move synchronously when it moves.

[0025] Reference Figure 2 The inner wall of the heat dissipation cylinder 3 is fixedly connected with a heat absorption ring 7 in a spiral structure.

[0026] Specifically, the heat-absorbing ring 7 is made of a metal material with excellent thermal conductivity. The heat generated by the barrel of the laser welding torch body 1 during operation can be quickly transferred to the heat-absorbing ring 7 through heat conduction. When the airflow flows through the heat dissipation cylinder 3, it can directly carry away the heat accumulated on the heat-absorbing ring 7. On the other hand, the spiral structure of the heat-absorbing ring 7 cooperates with the inner wall of the heat dissipation cylinder 3 to form a continuous spiral airflow channel, which significantly extends the flow path and residence time of the airflow in the heat dissipation cylinder 3, allowing the airflow to fully contact the heat-absorbing ring 7 and the inner wall of the heat dissipation cylinder 3, maximizing the heat exchange efficiency, rapidly reducing the temperature of the barrel of the laser welding torch body 1, greatly reducing the heat accumulation in the barrel, avoiding the performance degradation of the welding torch caused by high temperature, further extending the continuous working time of the equipment, and ensuring the stability of the welding process and the welding quality.

[0027] Reference Figure 3 One end of the support frame 8 is hinged to the end cover 44, and the other end of the support frame 8 is hinged to a connecting seat 9. The connecting seat 9 is fixedly connected to the outer wall of the fixed cylinder 2, and a bolt 10 is inserted between the connecting seat 9 and the support frame 8. One end of the bolt 10 is threaded with a wing nut 11.

[0028] Specifically, the angle between the support frame 8 and the gun barrel can be flexibly adjusted according to the actual welding posture of the laser welding gun body 1. Simultaneously, the hinged connection between the support frame 8 and the end cap 44 allows the opening of the negative pressure cover 41 to adaptively fit the skin surface at different angles and curvatures, ensuring a tight fit. After adjustment, tightening the wing nut 11 locks the relative position of the connecting seat 9 and the support frame 8 via the bolt 10, restricting the rotation of the support frame 8 and maintaining a stable working posture for the negative pressure component 4. The flexible adjustment of the negative pressure component 4 adapts to various welding scenarios in RV production, ensuring reliable contact between the negative pressure cover 41 and the skin, guaranteeing effective adsorption and fixation, and stable airflow for heat dissipation. It also prevents displacement of the negative pressure component 4 during welding, thus avoiding impact on welding accuracy and further enhancing the practicality of the device and the stability of the welding operation.

[0029] Reference Figure 4 The connecting ring 43 is threaded to the negative pressure cover 41 and the end cover 44.

[0030] Specifically, the connecting ring 43 is connected to the negative pressure cover 41 and the end cover 44 by threads, which can be quickly disassembled and assembled. The use of component assembly can reduce the production process and reduce subsequent maintenance costs and difficulties.

[0031] Example 2, refer to Figures 3-5This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: a connecting pipe 12 is rotatably connected inside the negative pressure cover 41, and the other end of the connecting pipe 12 movably passes through the end cover 44 and extends into the sealing cover 45. An impeller 13 connected to the end of the connecting pipe 12 is provided inside the negative pressure cover 41. A fan blade 14 connected to the outer wall of the connecting pipe 12 is provided inside the end cover 44. An air inlet pipe 15 is fixedly connected to the connecting ring 43. An air collection hood 16 is fixedly connected to the other end of the air inlet pipe 15. An air outlet pipe 17 is fixedly connected to the end cover 44. An exhaust hood 18 is fixedly connected to the other end of the exhaust pipe 17.

[0032] Specifically, the connecting pipe 5, sealing cover 45, and connecting pipe 12 work together to form a stable airflow channel, allowing air inside the negative pressure cover 41 to flow smoothly through the connecting pipe 12 to the connecting pipe 5. When air enters the negative pressure cover 41, it drives the impeller 13 to rotate, which in turn drives the fan blades 14 to rotate synchronously through the connecting pipe 12, creating suction at the air collection hood 16 to absorb the air, and then exhausting the air through the exhaust hood 18. In actual use, the air collection hood 16 can be set in the welded area, and the exhaust hood 18 can be set in the area to be welded. When the laser welding torch body 1 is engaged in welding, the gas collecting hood 16 can quickly absorb the residual heat of the welded area, causing the welded area to cool down rapidly and effectively avoiding the deformation of the skin caused by the thin skin and continuous high temperature. At the same time, the absorbed airflow carries heat and is discharged to the area to be welded through the exhaust hood 18. On the one hand, the airflow can blow away dust, debris and other impurities in the area to be welded, ensuring that the welding area is clean and undisturbed. On the other hand, it can preheat the area, reduce the temperature difference during welding, and shorten the welding time of the laser welding torch body 1. This not only ensures the stability of welding quality, but also further improves the efficiency of the overall welding operation.

[0033] Understandably, the negative pressure airflow generated by the negative pressure system directly drives the impeller 13 inside the negative pressure cover 41 to rotate, and then the fan blades 14 rotate synchronously through the connecting pipe 12, without the need for an additional drive motor. This design fully converts the idle kinetic energy of the negative pressure airflow into effective power for heat dissipation, cleaning, and preheating, maximizing energy utilization. It reduces the investment in additional power equipment and energy consumption, and adds the functions of cooling, cleaning, and preheating the welding area to the negative pressure system, which already adsorbs and fixes the skin and dissipates heat from the laser welding gun body 1. This further improves the integration level and energy utilization efficiency of the device.

[0034] It should be noted that both the intake pipe 15 and the exhaust pipe 17 are gooseneck pipes. The self-shaping ability of the gooseneck pipes allows the air collection hood 16 and the exhaust hood 18 to correspond to the respective areas.

[0035] Reference Figure 6The impeller 13 includes an annular plate 131 that is fixedly connected to the connecting pipe 12. A guide shroud 132 is provided on the side of the annular plate 131 facing the port of the negative pressure cover 41. Multiple guide plates 133 are connected between the guide shroud 132 and the annular plate 131. The multiple guide plates 133 are arranged in a ring with equal spacing.

[0036] Specifically, the air guide shroud 132 and the negative pressure cover 41 cavity cooperate to form an annular channel, restricting the airflow through the air guide plate 133, thereby driving the impeller 13 to rotate.

[0037] Reference Figure 5 A sealed bearing 19 is connected between the outer wall of the connecting pipe 12 and the side wall of the negative pressure cover 41.

[0038] Specifically, the sealed bearing 19 adopts a non-contact sealing structure, which improves the smoothness of rotation of the connecting pipe 12 while preventing gas leakage. The rest of the structure is the same as that in Embodiment 1.

[0039] Example 3, referring to Figure 1 , Figure 7 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the fixed cylinder 2 has a convex structure, and an adjusting ring 20 is rotatably connected to the outer wall of the large end of the fixed cylinder 2. Multiple through holes 21 are opened in an annular pattern at equal intervals on both the large end of the fixed cylinder 2 and the adjusting ring 20. An adjusting handle 22 is fixedly connected to the adjusting ring 20, and a spring 23 is connected between the adjusting handle 22 and the fixed cylinder 2.

[0040] Specifically, when spring 23 is not subjected to external force, it will drive the adjusting ring 20 to reset, so that the solid part of the adjusting ring 20 precisely aligns with the through hole 21 on the fixing cylinder 2. At this time, the negative pressure pipe 6, the fixing cylinder 2, the heat dissipation cylinder 3, and the connecting pipe 5 form a closed and directional airflow channel, ensuring that a stable adsorption force can be generated at the negative pressure cover 41, meeting the requirements for skin adhesion and fixation during welding. When it is necessary to cancel the adsorption, pressing the adjusting handle 22 will drive the adjusting ring 20 to rotate. After the through hole 21 on the adjusting ring 20 is completely aligned with the through hole 21 on the fixing cylinder 2, the outside air will be preferentially drawn in by the negative pressure pipe 6 through the aligned through hole 21, thereby quickly reducing the negative pressure suction force at the negative pressure cover 41. This design can achieve rapid switching of the adsorption force of the negative pressure cover 41 on the skin without shutting down the external negative pressure equipment. The operation is convenient and efficient, avoiding the time loss caused by frequent equipment start-ups and shutdowns, reducing the interference of equipment start-ups and shutdowns on the welding rhythm, and further improving the overall work efficiency.

[0041] The connecting ring 43 is positioned close to the negative pressure pipe 6. When the through hole 21 is in a state of communication with the outside, because the distance from the through hole 21 to the port of the negative pressure pipe 6 is less than the distance from the negative pressure cover 41 to the port of the negative pressure pipe 6, the negative pressure state inside the fixed cylinder 2 will preferentially reach equilibrium with the outside air through the through hole 21. This distance difference design can quickly weaken the adsorption force at the negative pressure cover 41, allowing the negative pressure cover 41 to be immediately released from its adsorption and fixation on the skin after the welding work is completed, without waiting for the equipment to depressurize. This facilitates the rapid transfer of the laser welding gun body 1 to the next welding area, effectively reducing the process connection time and further improving the continuity and efficiency of the overall welding operation. The remaining structures are the same as those in Embodiment 2.

[0042] Based on embodiments 1-3, the working principle of this invention is as follows: This device uses the laser welding gun body 1 as its core, working in conjunction with components such as the fixing cylinder 2, heat dissipation cylinder 3, and negative pressure component 4. The fixing cylinder 2 and heat dissipation cylinder 3 slide to adapt to the length of the gun barrel. An external negative pressure device establishes a negative pressure environment through the negative pressure pipe 6, which is then conducted to the negative pressure cover 41 via the fixing cylinder 2, heat dissipation cylinder 3, and connecting pipe 5. This causes the cover to adhere to the skin, ensuring a tight fit between the welding area and the frame to eliminate gaps. During welding, the laser welding gun body 1 moves the negative pressure component 4 synchronously, achieving dynamic pre-tightening of the skin. Simultaneously, airflow enters through the fine groove 42 of the negative pressure cover 41, working in conjunction with the spiral heat-absorbing ring 7 inside the heat dissipation cylinder 3 to remove heat from the gun barrel, preventing heat accumulation.

[0043] Example 4, refer to Figures 1-7 The fourth embodiment of the present invention provides a laser welding process for RV production, comprising the following steps: S1. Place the RV frame on the welding table, cut the corresponding skin according to the frame size, cover the frame with the skin and clamp it in place. S2. The welding head of the laser welding gun body 1 is aligned with the connection between the skeleton and the skin, and the port face of the negative pressure cover 41 is in contact with the skin. The negative pressure equipment is started and laser welding is performed. S3. After welding is completed, move the adjusting handle 22 to cancel the negative pressure of the negative pressure cover 41 and remove the laser welding gun body 1. S4. Use a wire brush to lightly clean the oxides from the weld surface and visually inspect it. Finally, apply high-performance sealant to the weld.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A laser welding device for the production of a motor home comprising a laser welding gun body (1), characterized in that, Also include each other sliding sleeve fixed cylinder (2) and heat dissipation cylinder (3), the heat dissipation cylinder (3) is sleeved on the outside of the laser welding gun body (1), the heat dissipation cylinder (3) is close to the end of the laser welding gun body (1) and the laser welding gun body (1) sealing connection, one end of the fixed cylinder (2) is connected with the body of the laser welding gun body (1), one side of the fixed cylinder (2) is provided with a negative pressure device (4), the negative pressure device (4) and the heat dissipation cylinder (3) are connected with the connecting pipe (5), one end of the fixed cylinder (2) is fixedly connected with the negative pressure pipe (6) away from the heat dissipation cylinder (3), the other end of the negative pressure pipe (6) is connected with the external negative pressure equipment; The negative pressure device (4) includes a negative pressure cover (41), the opening end of the negative pressure cover (41) is annularly and equidistantly provided with a plurality of fine grooves (42), the other end of the negative pressure cover (41) is connected with a connecting ring (43), the other end of the connecting ring (43) is connected with an end cover (44), one side of the end cover (44) is fixedly connected with a sealing cover (45), the sealing cover (45) is in communication with the connecting pipe (5), and the end cover (44) and the fixed cylinder (2) are jointly connected with a support frame (8), and the support frame (8) is used for adjusting the orientation of the negative pressure device (4).

2. The laser welding apparatus for the production of a recreational vehicle of claim 1, wherein, The inner wall of the heat dissipation cylinder (3) is fixedly connected with a heat absorbing ring (7) in a spiral structure.

3. The laser welding apparatus for the production of a recreational vehicle of claim 1, wherein, One end of the support frame (8) is hinged to the end cover (44), the other end of the support frame (8) is hinged with a connecting seat (9), the connecting seat (9) is fixedly connected to the outer wall of the fixed cylinder (2), and the connecting seat (9) and the support frame (8) are jointly inserted with a bolt (10), one end of the bolt (10) is threadedly connected with a butterfly nut (11).

4. The laser welding apparatus for the manufacture of a recreational vehicle of claim 1, wherein, The inner rotating connection of the negative pressure cover (41) has a communication pipe (12), the other end of the communication pipe (12) is movably penetrated through the end cover (44) and extends into the sealing cover (45), the negative pressure cover (41) is provided with an impeller (13) connected with the end of the communication pipe (12), the end cover (44) is provided with a fan blade (14) connected with the outer pipe wall of the communication pipe (12), and the connecting ring (43) is fixedly communicated with an air inlet pipe (15), the other end of the air inlet pipe (15) is fixedly connected with a gas collecting hood (16), the end cover (44) is fixedly communicated with an air outlet pipe (17), and the other end of the air outlet pipe (17) is fixedly connected with an exhaust hood (18).

5. The laser welding apparatus for the production of a recreational vehicle of claim 4, wherein, The impeller (13) includes an annular plate (131) fixedly communicated with the communication pipe (12), one side of the annular plate (131) towards the port of the negative pressure cover (41) is provided with a wind deflector (132), and the wind deflector (132) and the annular plate (131) are jointly connected with a plurality of wind deflectors (133), and the plurality of wind deflectors (133) are annularly and equidistantly arranged.

6. The laser welding apparatus for the production of a recreational vehicle of claim 5, wherein, The outer pipe wall of the communication pipe (12) and the side wall of the negative pressure cover (41) are jointly connected with a sealing bearing (19).

7. The laser welding apparatus for the manufacture of a recreational vehicle of claim 1 wherein, The connecting ring (43) is threadedly connected with the negative pressure cover (41) and the end cover (44).

8. The laser welding apparatus for the manufacture of a recreational vehicle of claim 1, wherein, The fixed cylinder (2) is in convex structure, the outer wall of the big end of the fixed cylinder (2) is rotatably connected with an adjusting ring (20), a plurality of through holes (21) are evenly and annularly arranged on the big end of the fixed cylinder (2) and the adjusting ring (20), the adjusting ring (20) is fixedly connected with an adjusting handle (22), and the adjusting handle (22) and the fixed cylinder (2) are jointly connected with a spring (23).

9. A laser welding process for the production of motor homes, which is applied to the laser welding device for the production of motor homes as claimed in claim 8, characterized in that, The method comprises the following steps: S1, the motor home skeleton is placed on the welding table, the corresponding skin is cut according to the size of the skeleton, the skin is covered on the skeleton and clamped and fixed through the clamp; S2, the welding head of the laser welding gun body (1) is opposite to the connecting part of the skeleton and the skin, the port surface of the negative pressure cover (41) is in contact with the skin, the negative pressure equipment is started, and laser welding is carried out; S3, after welding is completed, the adjusting handle (22) is actuated, the negative pressure of the negative pressure cover (41) is cancelled, and the laser welding gun body (1) is removed; S4, the oxide on the surface of the weld is slightly cleaned using a steel wire brush, visual inspection is carried out, and finally high-performance sealant is applied to the weld.

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