A frame welding processing auxiliary device

Abstract

The application discloses a kind of vehicle frame welding processing auxiliary devices, it is related to the technical field of auxiliary tooling for plasma arc welding, including the cylinder frame being installed on the surface of pedestal by bolt.The vehicle frame welding processing auxiliary device, before welding procedure starts, by jacking electric push rod drive the top rod to rise, using the top plate of triangle forcibly wedging into the butt joint gap of vehicle frame body, make weld area produce a upward V-shaped pre-deformation in advance, when plasma arc welding is completed, the top plate is separated from weld, the top rod drops and starts heat dissipation mechanism, the rising airflow generated by cooling fan is focused on the back of weld under the guidance of fairing, this forced air cooling accelerates the solidification and shrinkage of weld metal, at this time, the pre-set V-shaped groove is under the action of cooling shrinkage stress, offset the downward concave tendency of weld metal due to thermal expansion and contraction, so that vehicle frame plate can automatically recover to the expected flat state after final cooling and setting, effectively control welding deformation.

Description

Technical Field

[0001] This invention relates to the field of auxiliary tooling technology for plasma arc welding, specifically an auxiliary device for vehicle frame welding. Background Technology

[0002] Plasma arc welding is a highly efficient welding technology. Its principle is to ionize gas through an electric arc to form a high-temperature plasma, thereby achieving the fusion of metals. This welding method has the advantages of low heat input, fast welding speed, and narrow weld width. It is suitable for joining high-strength materials and is widely used in the automotive, aerospace and other fields. In the production process of automobile frames, the auxiliary device used for plasma arc welding plays a crucial role. It can provide stable support and precise positioning to ensure that the welded parts maintain the correct relative position during the welding process.

[0003] Existing patent CN104043937A describes a vehicle frame crossbeam flipping and welding device, relating to the field of welding fixture technology. It includes a frame with a flipping frame, driven by a flipping drive device. The flipping frame consists of a base plate and side plates connected to both ends of the base plate. Two end seats with shaft end positioning components, driven by a first cylinder, are mounted on the base plate of the flipping frame. Between the two end seats are multiple positioning seats with pressure heads, driven by a second cylinder. The top of each positioning seat has a positioning groove, and the bottom of each pressure head has a positioning block corresponding to the positioning groove of the positioning seat. Compared with existing technologies, this invention can automatically flip and reposition the welding parts of the vehicle frame crossbeam at different angles, resulting in stable welding quality, high efficiency, automated production, and convenient management.

[0004] Based on the aforementioned patents and existing auxiliary devices for plasma arc welding, it is known that plasma arc welding is a high-energy beam process with a fast welding speed, but the instantaneous heat input is extremely high. This causes uneven thermal expansion of the frame plates during welding, and the weld shrinkage stress concentration during cooling. In addition, the slow natural cooling rate results in excessively long high-temperature dwell time, leading to coarse grains, which reduces the toughness of the joint and easily causes the weld area to sink and deform, affecting the flatness of the weld. Therefore, this solution proposes an auxiliary device for frame welding processing. Summary of the Invention

[0005] The purpose of this invention is to provide an auxiliary device for vehicle frame welding to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an auxiliary device for vehicle frame welding, comprising a cylindrical frame bolted to a base surface, a protective cover bolted to one side of the cylindrical frame, an integrally formed bearing sleeve welded to the central axis of the cylindrical frame, a rotating main shaft provided inside the bearing sleeve, a lifting push rod slidably sleeved inside the main shaft, and an integrally formed top plate connected to the top center of the push rod, the top plate having a triangular cross-sectional shape;

[0007] The bottom end of the cylindrical frame is bolted with a lifting electric push rod whose output end is connected to the top rod. Air inlets for auxiliary heat dissipation are provided on the inner walls of both sides of the cylindrical frame. A heat dissipation mechanism for air cooling of the weld is installed on the inner wall of the cylindrical frame. The heat dissipation mechanism includes a gear ring welded and fixed to the inner wall of the cylindrical frame. Two No. 1 gears are meshed on the inner side of the gear ring. The surface of the No. 1 gear is provided with a rotating cooling fan. The inner wall of the main shaft is provided with symmetrically distributed spiral lifting grooves. Protective mechanisms to prevent debris from entering and to guide airflow are installed on both sides of the cylindrical frame above the air inlets. The protective mechanism includes a guide shroud located at the upper end of the cylindrical frame.

[0008] Furthermore, the lifting electric push rod is connected to the bottom end of the push rod by screws, an integrally formed flow guide ring is connected to the inner wall of the cylinder frame, and the bottom end of the cooling fan is connected to a support shaft that forms a welded structure with the first gear by bolts.

[0009] Connecting plates are welded to both sides of the main shaft. The connecting plates are connected to the support shaft through bearings, and the support shaft is connected to the connecting plates through bearings.

[0010] Furthermore, both sides of the bottom end of the top rod near the lifting electric push rod are fixed with sliders that form a sliding connection structure with the lifting groove.

[0011] Furthermore, the cross-sections of the two guide shields facing each other are set as triangles, and a notch for the top rod to pass through is opened at the center where the two guide shields are close together. A sliding bar with a T-shaped cross-section is welded to the bottom surface of the guide shield.

[0012] The outer side of the slide bar is slidably sleeved with a sleeve that matches the shape of the slide bar. The end of the slide bar is movably connected to a connecting rod that drives the guide shroud to tilt open or close via a hinge seat. The end of the connecting rod away from the slide bar is fixedly sleeved with a drive shaft. The drive shaft is connected to the outer wall of the cylinder frame via a bearing.

[0013] Furthermore, a rotating shaft is welded to the inner wall of the notch on both sides of the cylinder frame, and the rotating shaft moves through the end of the sleeve frame. The transmission shaft passes through part of the inner wall of the cylinder frame, and a No. 2 gear is welded to one end of the transmission shaft located in the inner cavity of the protective cover.

[0014] Furthermore, a rack is meshed below the second gear, and a bidirectional electric push rod that pushes the rack to move laterally is bolted between the two racks.

[0015] Furthermore, a plasma arc welding device is provided on one side of the base, and end clamping mechanisms are provided at both ends of the base. An auxiliary clamping mechanism is installed on the surface of the base located between the two end clamping mechanisms. The inner sides of the end clamping mechanism and the auxiliary clamping mechanism clamp the vehicle frame body.

[0016] Furthermore, the end clamping mechanism includes a first upright frame bolted to both ends of the base, and the top of the first upright frame is movably connected to a first clamping frame for clamping the end surface of the vehicle frame body via a hinge.

[0017] Furthermore, one end of the first clamping frame located at the top of the first upright frame is movably connected to the first cylinder via a hinge, and the side of the first cylinder is connected to the first upright frame via the hinge.

[0018] Furthermore, the auxiliary clamping mechanism includes a second upright frame that is bolted to the surface of the base. The top of the second upright frame is movably connected to a second clamping frame that clamps the surface of the vehicle frame body via a hinge. One end of the second clamping frame located at the top of the second upright frame is movably connected to a second cylinder via a hinge, and the side of the second cylinder is connected to the second upright frame via a hinge.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. Before the welding process begins, the frame welding auxiliary device drives the push rod to rise via an electric push rod. The triangular top plate is forcibly wedged into the butt joint of the frame body, creating an upward V-shaped pre-deformation in the weld area. After the plasma arc welding is completed and the top plate is removed from the weld, the push rod descends and the heat dissipation mechanism is activated. The rising airflow generated by the cooling fan is focused on the back of the weld under the guidance of the air guide. This forced air cooling accelerates the solidification and shrinkage of the weld metal, reduces the possibility of coarse grains, and improves the toughness of the joint. At this time, the pre-set V-shaped bevel, under the action of cooling shrinkage stress, counteracts the downward concave tendency of the weld metal caused by thermal expansion and contraction, so that the frame plate can automatically return to the expected flat state after final cooling and shaping, effectively controlling welding deformation.

[0021] 2. The auxiliary device for welding processing of this frame has a heat dissipation mechanism that drives airflow to blow away debris around the weld, making the weld surface smoother. At the same time, the cooling fan, which combines rotation and revolution, can cool the weld uniformly from all directions, avoiding torsional stress caused by excessive cooling on one side. The V-shaped bevel formed by the top plate not only facilitates the penetration of the plasma arc, but also prevents the weld from burning through.

[0022] 3. The auxiliary device for welding processing of the chassis, the guide shroud of the protective mechanism mainly serves to close the top cover of the cylinder frame and prevent dust or welding spatter from falling into the interior. At the same time, when opened, it guides the airflow upward to maintain the stability of heat dissipation and lifting operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the base structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the frame structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the auxiliary clamping mechanism of the present invention;

[0027] Figure 5 This is a schematic diagram of the end clamping mechanism of the present invention;

[0028] Figure 6 This is a schematic diagram of the tube frame structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the internal structure of the tube frame of the present invention;

[0030] Figure 8 This is a schematic diagram of the cooling fan structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the heat dissipation mechanism of the present invention;

[0032] Figure 10 This is a schematic diagram of the internal structure of the spindle of the present invention;

[0033] Figure 11 This is a schematic diagram of the lifting groove structure of the present invention;

[0034] Figure 12 This is a schematic diagram of the internal structure of the protective cover of the present invention;

[0035] Figure 13 This is a schematic diagram of the flow guide structure of the present invention;

[0036] Figure 14 This is a schematic diagram of the protective mechanism structure of the present invention;

[0037] Figure 15 This is a schematic diagram of the slider structure of the present invention.

[0038] In the diagram: 1. Base; 2. Plasma arc welding device; 3. End clamping mechanism; 301. First upright; 302. First clamping frame; 303. First cylinder; 4. Protective cover; 5. Cylinder frame; 6. Auxiliary clamping mechanism; 601. Second upright; 602. Second cylinder; 603. Second clamping frame; 7. Protective mechanism; 701. Flow guide; 702. Sliding bar; 703. Sleeve; 704. Connecting rod; 705 8. Drive shaft; 9. Heat dissipation mechanism; 10. Gear No. 1; 11. Gear ring; 12. Support shaft; 13. Connecting plate; 14. Chassis body; 15. Lifting electric push rod; 16. Air inlet; 17. Rotating shaft; 18. Gear No. 2; 19. Rack; 20. Bidirectional electric push rod; 21. Bearing sleeve; 22. Main shaft; 33. Push rod; 44. Top plate; 55. Cooling fan; 66. Sliding block; 77. Lifting groove. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1-5 This invention provides a technical solution: an auxiliary device for vehicle frame welding, including a plasma arc welding device 2 located on one side of a base 1. The plasma arc welding device 2 generates a high-temperature plasma arc to perform welding operations on the vehicle frame body 9. Both ends of the base 1 are provided with end clamping mechanisms 3. An auxiliary clamping mechanism 6 is installed on the surface of the base 1 located between the two end clamping mechanisms 3. The end clamping mechanisms 3 and the auxiliary clamping mechanism 6 clamp the vehicle frame body 9 on their inner sides. Through the multi-point cooperation of the end clamping mechanisms 3 and the auxiliary clamping mechanism 6, the vehicle frame body 9 is confined above the base 1 to meet the requirements of plasma arc welding.

[0041] In practice, before welding, the two frame bodies 9 are placed on the end clamping mechanism 3 and the auxiliary clamping mechanism 6. Then, the end clamping mechanism 3 and the auxiliary clamping mechanism 6 are activated to perform multi-point positioning and clamping on the ends and sides of the frame bodies 9. The plasma arc welding device 2 is then used to perform welding operations on the joints of the two frame bodies 9.

[0042] See Figures 2-5It is known that the end clamping mechanism 3 includes a first upright 301 that is bolted to both ends of the base 1. The first upright 301 serves as a bearing base and is fastened to the base 1 by bolts to provide a stable support base. The top of the first upright 301 is movably connected to a first clamping frame 302 that clamps the end surface of the frame body 9 through a hinge. The first clamping frame 302 is rotatably connected to the first upright 301 through a hinge to realize a lever-type flipping clamping action. The end of the first clamping frame 302 located at the top of the first upright 301 is movably connected to a first cylinder 303 through a hinge, and the side of the first cylinder 303 is connected to the first upright 301 through a hinge.

[0043] The auxiliary clamping mechanism 6 includes a second upright 601 bolted to the surface of the base 1. The top of the second upright 601 is movably connected to a second clamping frame 603 for clamping the surface of the frame body 9 via a hinge. One end of the second clamping frame 603 located at the top of the second upright 601 is movably connected to a second cylinder 602 via a hinge, and the side of the second cylinder 602 is connected to the second upright 601 via a hinge.

[0044] In practice, during clamping, cylinder 303 is activated, causing its piston rod to extend and rotate clamping frame 302 around the hinge connecting it to support frame 301. This causes the free end of clamping frame 302 to press down, while cylinder 602 drives clamping frame 603 to swing around its hinge point with support frame 601. The clamping surface of clamping frame 603 presses against the surface of the frame body 9, achieving stable clamping of the frame body 9, preventing displacement during welding, ensuring a constant distance between the nozzle of plasma arc welding device 2 and the workpiece surface, and maintaining the stability of the plasma arc.

[0045] See Figure 1 , Figure 2 and Figures 6-13 It can be seen that a cylindrical frame 5 is bolted to the surface of the base 1 located at the center of the frame body 9. A protective cover 4 is bolted to one side of the cylindrical frame 5. An integrally formed bearing sleeve 16 is welded on the central axis of the cylindrical frame 5. A rotating main shaft 17 is provided on the inner side of the bearing sleeve 16, and the main shaft 17 and the bearing sleeve 16 form an axially limited movable sleeve fit. A lifting top rod 18 is slidably sleeved on the inner side of the main shaft 17, and an integrally formed top plate 19 is connected to the top center of the top of the top rod 18.

[0046] The top plate 19 has a triangular cross-sectional shape. When the top plate 19 is close to the center weld of the frame body 9, the tip of the top plate 19 causes the weld of the frame body 9 to be slightly raised, and then the weld forms a V shape. The top rod 18 is connected to the top of the top of both sides of the top plate 19 with an integrally formed support block to support the weld of the frame body 9 on both sides.

[0047] In practice, before plasma arc welding, the lifting electric push rod 10 is activated, which pushes the push rod 18 upward, causing the triangular top plate 19 to be inserted into the butt joint of the frame body 9. This causes the weld of the frame body 9 to tilt slightly upward, and the top plate 19 forcibly opens the weld to form a uniform V-shaped bevel. At the same time, the support block at the top of the push rod 18 supports both sides of the weld, providing stable support for the weld of the frame body 9.

[0048] By pre-deforming the joint of the frame body 9 with an upward V-shape, the V-shaped bevel formed by the top plate 19 not only facilitates the penetration of the plasma arc, but also prevents the welding from burning through. After the welding work is completed, the top plate 19 is separated from the weld of the frame body 9. Subsequently, the weld cools and shrinks, which can offset the downward shrinkage deformation, and finally restore the weld area to flatness.

[0049] See Figure 1 , Figures 6-9 and Figure 13 It is known that the bottom end of the cylindrical frame 5 is bolted with a lifting electric push rod 10 whose output end is connected to the top rod 18, and the lifting electric push rod 10 and the bottom end of the top rod 18 are connected by screws. Air inlets 11 for auxiliary heat dissipation are provided on the inner walls of both sides of the cylindrical frame 5. An integrally formed flow guide ring is connected to the inner wall of the cylindrical frame 5, and the upper end of the flow guide ring is inclined. A heat dissipation mechanism 8 for air cooling of the weld is installed on the inner wall of the cylindrical frame 5 located inside the flow guide ring.

[0050] In practice, after welding is completed, the lifting electric push rod 10 drives the top rod 18 and the top plate 19 to descend. Then, the weld is cooled by the heat dissipation mechanism 8. The guide ring guides the airflow generated by the heat dissipation mechanism 8, so that the airflow is discharged upward. At the same time, the external airflow enters the inside of the tube frame 5 from the air inlet 11.

[0051] See Figures 7-9It is known that the heat dissipation mechanism 8 includes a gear ring 802 welded and fixed to the inner wall of the cylinder frame 5. The inner side of the gear ring 802 is meshed with two No. 1 gears 801. The gear ring 802, as a fixed central outer gear ring, provides a reverse torque for the transmission of the No. 1 gear 801. The No. 1 gear 801 meshes with the gear ring 802 and is forced to rotate while revolving. The surface of the No. 1 gear 801 is provided with a rotating cooling fan 20. The cooling fan 20 rotates synchronously with the No. 1 gear 801, converting electrical energy into forced airflow. The bottom end of the cooling fan 20 is connected by bolts to a support shaft 803 that forms a welded structure with the No. 1 gear 801. The two sides of the main shaft 17 are welded with connecting plates 804. The connecting plates 804 are connected to the support shaft 803 through bearings. The support shaft 803 is connected to the connecting plates 804 through bearings, so that the support shaft 803 can both revolve with the connecting plates 804 and rotate on the connecting plates 804.

[0052] In practice, during air cooling, the main shaft 17 drives the connecting plate 804 to rotate. Then, the connecting plate 804 drives the first gear 801 and the cooling fan 20 to rotate in a circle within the cylinder frame 5 via the support shaft 803. At the same time, the first gear 801 meshes with the gear ring 802, so that the first gear 801 drives the cooling fan 20 to rotate in a circle while rotating on its own axis, forming a compound motion trajectory to provide all-round rotating air cooling to the weld area.

[0053] The airflow cooling mechanism 8 helps to improve the cooling speed of the weld metal, promotes weld shrinkage and flattening, reduces the possibility of coarse grains, improves joint toughness, and the airflow can cause debris around the weld to fall outward, making the weld surface smoother. At the same time, the cooling fan 20, which combines rotation and revolution, can cool the weld uniformly from all directions, avoiding torsional stress caused by excessive cooling on one side, and significantly reducing bending and torsional deformation caused by temperature difference stress. Furthermore, the air cooling and the top plate 19 work together to ensure uniform cooling and flatness of the weld.

[0054] See Figure 7 and Figures 8-11 It is known that the inner wall of the main shaft 17 is provided with symmetrically distributed lifting grooves 22, and the lifting grooves 22 are spiral-shaped. The bottom ends of the top rod 18 near the lifting electric push rod 10 are fixed with sliders 21 that form a sliding connection structure with the lifting grooves 22.

[0055] In practice, when the top rod 18 is pushed by the lifting electric push rod 10 to move linearly, the slider 21 on the top rod 18 is squeezed by the lifting groove 22, causing the slider 21 to slide along the spiral lifting groove 22, which forces the main shaft 17 to rotate within the bearing sleeve 16, thereby realizing the conversion of linear motion to rotational motion, and then driving the heat dissipation mechanism 8 to rotate.

[0056] See Figure 7 , Figure 8 and Figures 12-15 It is known that the cylinder frame 5 is equipped with protective mechanisms 7 on both sides above the air inlet 11 to prevent debris from entering and to guide the airflow. The protective mechanism 7 is installed at the top opening of the cylinder frame 5. It mainly serves to seal the top cover of the cylinder frame 5 and prevent dust or welding spatter from falling into the interior. At the same time, it guides the airflow upward when it is open. The protective mechanism 7 includes a guide hood 701 located at the upper end of the cylinder frame 5. The cross-section of the two guide hoods 701 is triangular, and a notch for the top rod 18 to pass through is opened at the center where the two guide hoods 701 are close together. The guide hood 701 serves as the main body of the top cover, covering the upper surface of the cylinder frame 5 and directly shielding or opening the internal space of the cylinder frame 5.

[0057] The bottom surface of the flow guide 701 is welded with a T-shaped slide bar 702. The outer side of the slide bar 702 is slidably sleeved with a sleeve 703 that matches the shape of the slide bar 702. The end of the slide bar 702 is movably connected to a connecting rod 704 that drives the flow guide 701 to tilt open or close via a hinge seat. The end of the connecting rod 704 away from the slide bar 702 is fixedly sleeved with a drive shaft 705. The drive shaft 705 is connected to the outer wall of the cylinder frame 5 via a bearing.

[0058] In practice, during welding, the two guide shrouds 701 are in a closed state, with their central notches fitted onto the outside of the top rod 18, so that the top of the cylinder frame 5 is in a closed state. The welding spatter falls onto the guide shrouds 701 and can fall down along the slope of the guide shrouds 701 without entering the interior of the cylinder frame 5, thus protecting the internal heat dissipation mechanism 8 and rotating parts from contamination.

[0059] After welding is completed, the two ends of the bidirectional electric push rod 15 retract synchronously, driving the rack 14 to move laterally, which in turn drives the second gear 13 and the transmission shaft 705 to rotate. The transmission shaft 705 then drives the connecting rod 704 to rotate, causing the end of the sliding bar 702 pulled by the connecting rod 704 to slide downward and tilt. At the same time, the sliding bar 702 is restricted by the sleeve 703 and can only slide along the inner wall of the sleeve 703, causing the end of the sleeve 703 to rotate around the rotating shaft 12. This causes the sliding bar 702 to drive the guide shroud 701 to rotate and tilt. At this time, the top opening of the cylinder frame 5 is completely open, which can be used according to... Figures 13-15 It can be seen that the two air guides 701 form an inclined air guide surface. When the heat dissipation mechanism 8 is working, the cooling fan 20 rotates to generate suction. External air enters from the air inlet 11 below. After passing through the inside of the frame 5, it is guided by the inclined surface of the air guide 701 above, changing from vertical rise to horizontal convergence towards the central axis. This makes the airflow focus on the weld area, which can remove the heat at the weld and prevent the heat from being conducted deep into the frame plate, thereby effectively controlling the welding deformation.

[0060] See Figures 12-15 It is known that a rotating shaft 12 is welded to the inner wall of the notch on both sides of the cylindrical frame 5, and the rotating shaft 12 moves through the end of the sleeve 703. The transmission shaft 705 passes through part of the inner wall of the cylindrical frame 5. A second gear 13 is welded to one end of the transmission shaft 705 located in the inner cavity of the protective cover 4. A rack 14 is meshed below the second gear 13. A bidirectional electric push rod 15 for pushing the rack 14 to move laterally is connected between the two racks 14 by bolts.

[0061] In practice, the bidirectional electric push rod 15 extends and retracts, causing the racks 14 on both sides to move synchronously in opposite directions. The racks 14 drive the second gear 13 to rotate, which in turn drives the transmission shaft 705 to rotate. Through the transmission of the connecting rod 704 and the slide bar 702, the synchronous opening and closing of the two side guide shields 701 is finally achieved.

[0062] In summary, when using this frame welding auxiliary device, the entire base 1 is first installed on the side of the plasma arc welding device 2, and then the frame body 9 is placed on the end clamping mechanism 3 and the auxiliary clamping mechanism 6. The clamping frame is driven to press down by the first cylinder 303 and the second cylinder 602 to achieve multi-point positioning and clamping. Before welding, the lifting electric push rod 10 pushes the push rod 18, and the triangular top plate 19 is inserted into the weld to form a V-shaped pre-deformation. After welding, the push rod 18 descends and drives the slider 21 to slide along the spiral lifting groove 22, driving the main shaft 17 to drive the heat dissipation mechanism 8 to rotate, so as to perform all-round air cooling on the weld. When the protective mechanism 7 is closed, it prevents dust, and when it is open, it guides the airflow to focus on the weld. With the anti-deformation support of the top plate 19, the welding thermal deformation is effectively controlled. The contents not described in detail in this description belong to the prior art known to those skilled in the art.

Claims

1. A chassis welding auxiliary device, comprising a cylindrical frame (5) bolted to the surface of a base (1), characterized in that: A protective cover (4) is bolted to one side of the tube frame (5). An integrally formed bearing sleeve (16) is welded on the central axis of the tube frame (5). A rotating main shaft (17) is provided on the inner side of the bearing sleeve (16). A lifting top rod (18) is slidably sleeved on the inner side of the main shaft (17). An integrally formed top plate (19) is connected to the top center of the top rod (18). The cross-sectional shape of the top plate (19) is triangular. The bottom end of the cylindrical frame (5) is bolted with a lifting electric push rod (10) whose output end is connected to the push rod (18). The inner walls of both sides of the cylindrical frame (5) are provided with air inlets (11) for auxiliary heat dissipation. The inner wall of the cylindrical frame (5) is provided with a heat dissipation mechanism (8) for air cooling of the weld. The heat dissipation mechanism (8) includes a toothed ring (802) welded and fixed on the inner wall of the cylindrical frame (5). The inner side of the toothed ring (802) is meshed with two No. 1 gears (801). The surface of the No. 1 gear (801) is provided with a rotating cooling fan (20). The inner wall of the main shaft (17) is provided with a spiral lifting groove (22) that is symmetrically distributed. The two sides of the cylindrical frame (5) above the air inlet (11) are provided with a protective mechanism (7) to prevent debris from entering and to guide the airflow. The protective mechanism (7) includes a guide shroud (701) located at the upper end of the cylindrical frame (5).

2. The auxiliary device for vehicle frame welding processing according to claim 1, characterized in that: The lifting electric push rod (10) and the bottom end of the push rod (18) are connected by screws. An integrally formed flow guide ring is connected to the inner wall of the cylinder frame (5). The bottom end of the cooling fan (20) is connected by bolts to a support shaft (803) that forms a welded structure with the first gear (801). The main shaft (17) has connecting plates (804) welded on both sides. The connecting plates (804) are connected to the support shaft (803) through bearings. The support shaft (803) is connected to the connecting plates (804) through bearings.

3. The auxiliary device for vehicle frame welding processing according to claim 2, characterized in that: The top rod (18) has sliders (21) fixed on both sides of the bottom end near the lifting electric push rod (10), which form a sliding connection structure with the lifting groove (22).

4. The auxiliary device for vehicle frame welding processing according to claim 1, characterized in that: The cross-sections of the two flow guides (701) are triangular, and a notch for the top rod (18) to pass through is provided at the center where the two flow guides (701) are close together. A sliding strip (702) with a T-shaped cross-section is welded to the bottom surface of the flow guide (701). The outer side of the slide bar (702) is slidably sleeved with a sleeve (703) that matches the shape of the slide bar (702). The end of the slide bar (702) is movably connected to a connecting rod (704) that drives the guide cover (701) to tilt open or close via a hinge seat. The end of the connecting rod (704) away from the slide bar (702) is fixedly sleeved with a drive shaft (705). The drive shaft (705) is connected to the outer wall of the cylinder frame (5) via a bearing.

5. The auxiliary device for chassis welding processing according to claim 4, characterized in that: The inner walls of the two side notches of the cylindrical frame (5) are welded with rotating shafts (12), and the rotating shafts (12) are movably inserted through the end of the sleeve (703). The drive shaft (705) is inserted through part of the inner wall of the cylindrical frame (5). The drive shaft (705) is located at one end of the inner cavity of the protective cover (4) and a second gear (13) is welded thereon.

6. The auxiliary device for vehicle frame welding processing according to claim 5, characterized in that: A rack (14) is meshed below the second gear (13), and a bidirectional electric push rod (15) for pushing the rack (14) to move laterally is bolted between the two racks (14).

7. The auxiliary device for vehicle frame welding processing according to claim 1, characterized in that: A plasma arc welding device (2) is provided on one side of the base (1), and an end clamping mechanism (3) is provided at both ends of the base (1). An auxiliary clamping mechanism (6) is installed on the surface of the base (1) between the two end clamping mechanisms (3). The inner sides of the end clamping mechanism (3) and the auxiliary clamping mechanism (6) clamp the vehicle frame body (9).

8. The auxiliary device for vehicle frame welding processing according to claim 7, characterized in that: The end clamping mechanism (3) includes a first upright (301) bolted to both ends of the base (1), and the top of the first upright (301) is movably connected to a first clamping frame (302) for clamping the end surface of the frame body (9) via a hinge.

9. The auxiliary device for chassis welding processing according to claim 8, characterized in that: The first clamping frame (302) is located at the top of the first upright frame (301) and is movably connected to the first cylinder (303) via a hinge seat. The side of the first cylinder (303) is connected to the first upright frame (301) via the hinge seat.

10. The auxiliary device for chassis welding processing according to claim 7, characterized in that: The auxiliary clamping mechanism (6) includes a second upright (601) that is bolted to the surface of the base (1). The top of the second upright (601) is movably connected to a second clamping frame (603) that clamps the surface of the frame body (9) via a hinge. One end of the second clamping frame (603) located at the top of the second upright (601) is movably connected to a second cylinder (602) via a hinge. The side of the second cylinder (602) is connected to the second upright (601) via a hinge.

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