Welding device and welding method for buffer beam of turnover aluminum alloy railway vehicle

Abstract

The invention relates to an overturning aluminum alloy railway vehicle buffer beam welding device and a welding method thereof, and belongs to the technical field of buffer beam welding, the overturning aluminum alloy railway vehicle buffer beam welding device comprises a supporting frame, a plurality of telescopic rods and a plurality of connecting rods are arranged on the supporting frame in a sliding mode, and each telescopic rod and each connecting rod are each connected with a clamping overturning assembly; the multiple clamping and overturning assemblies jointly drive the buffer beam to overturn, the connecting rod is connected with a welding head, the welding head is located at the end, away from the clamping and overturning assemblies, of the connecting rod, the supporting frame is connected with a movable overturning mechanism, and the movable overturning mechanism is used for driving the connecting rod to move and overturn. The multi-angle overturning device has the effects that multi-angle flexible overturning of the buffer beam of the aluminum alloy railway vehicle is achieved, and the welding efficiency and the welding quality are improved.

Description

Technical Field

[0001] This application relates to the field of buffer beam welding technology, and in particular to a welding device and welding method for a tilting aluminum alloy rail vehicle buffer beam. Background Technology

[0002] As a key load-bearing component ensuring train operation safety, the structural strength and connection stability of the buffer beam in rail vehicles directly affect the overall operational reliability of the vehicle. With the rail transit industry's pursuit of lightweight and high performance, aluminum alloy, with its advantages of low density, high strength, and corrosion resistance, has become one of the mainstream materials for rail vehicle buffer beams. However, the welding process for aluminum alloy buffer beams requires extremely precise adjustment of the workpiece position, necessitating multi-directional and multi-angle welding operations for different weld locations to ensure weld formation quality and connection strength.

[0003] Currently, most existing welding auxiliary devices for rail vehicle components on the market suffer from limited functionality. These devices cannot achieve multi-angle rotation of the buffer beam, necessitating frequent manual adjustments to the workpiece position during welding. Manual adjustments easily lead to positioning deviations, resulting in uneven welds, increased defect rates, and other problems that severely affect welding quality. Furthermore, manual adjustments require workers to expend significant physical effort in handling, fixing, and adjusting the workpiece, significantly increasing labor intensity and greatly extending the welding cycle. The buffer beam is also prone to damage during handling. Therefore, existing welding auxiliary devices for buffer beams cannot meet the requirements of efficient and convenient processes in modern production. Summary of the Invention

[0004] In order to achieve flexible multi-angle flipping of aluminum alloy rail vehicle buffer beams and improve welding efficiency and welding quality, this application provides a welding device and welding method for flipping aluminum alloy rail vehicle buffer beams.

[0005] The technical solution provided in this application for a welding device and welding method for a tilting aluminum alloy rail vehicle buffer beam is as follows: A welding device for a tilting aluminum alloy rail vehicle buffer beam includes a support frame. Several telescopic rods and several connecting rods are slidably arranged on the support frame. Each telescopic rod and each connecting rod is connected to a clamping and tilting assembly. The clamping and tilting assemblies together drive the buffer beam to tilt. A welding head is connected to the connecting rod. The welding head is located at the end of the connecting rod away from the clamping and tilting assembly. A movable tilting mechanism is connected to the support frame. The movable tilting mechanism is used to drive the connecting rod to move and tilt.

[0006] By adopting the above technical solution, the support frame provides a stable support benchmark for the entire device, avoiding the impact of foundation shaking on accuracy during welding. Several telescopic rods and several connecting rods can slide flexibly along the support frame, driving the clamping and flipping components to form an encircling clamp from different positions of the buffer beam, thereby driving the buffer beam to flip, which facilitates multi-angle welding of the buffer beam by the welding head. The moving flipping mechanism can not only drive the connecting rods to adjust their positions, so that the welding head can accurately align with the buffer beam for welding, but also drive the connecting rods to turn, realizing a quick switch between clamping and flipping operations and welding operations: when clamping, the components face the buffer beam, and when welding, the welding head aligns with the weld seam, so that the flipping and welding connection can be completed without disassembling the workpiece, improving the continuity of operations.

[0007] Optionally, the clamping and flipping assembly includes a rotating frame with a first sliding groove and an arc rack inside the sliding groove. A drive gear is connected to the rotating frame, and the drive gear meshes with the arc rack. The inner arc surface of the arc rack abuts against the buffer beam.

[0008] By adopting the above technical solution, the rotating frame serves as the installation carrier, and its first sliding groove provides a guide track for the arc rack, ensuring the stability of the rack's sliding trajectory. The drive gear precisely meshes with the arc rack, converting the rotational power into the arc motion of the rack, resulting in high transmission efficiency and no slippage. The inner arc surface of the arc rack abuts against the buffer beam, stably clamping the buffer beam. When the rack slides along the sliding groove, it can drive the buffer beam to rotate synchronously, and the rotation angle is controllable, solving the problem of laborious manual rotation of the buffer beam and large angle deviation in traditional welding.

[0009] Optionally, four rotating frames are provided, and the four rotating frames have the same structure. The four rotating frames are spliced ​​into a ring, and the first sliding grooves opened on the rotating frames are also spliced ​​into an annular groove. Eight arc-shaped racks are provided, and all eight arc-shaped racks are set in the first sliding grooves and are spliced ​​together to form a ring. The support frame is provided with a support member, which can support the 45° rotated buffer beam when the buffer beam is rotated 45°.

[0010] By adopting the above technical solution, four rotating frames are spliced ​​into a ring, and eight arc-shaped racks form a complete ring to clamp the buffer beam and drive it to rotate. The splicing structure design of the eight arc-shaped racks allows the rotating frames to selectively separate after the buffer beam has rotated 45°, increasing the positioning angle of the rotating frames after rotation, which facilitates the welding head to weld the buffer beam. After the buffer beam has rotated 45°, the support can extend from below the buffer beam to support it, maintain the tilt of the buffer beam, and not interfere with the subsequent rotation action, ensuring the stability of the buffer beam during the welding process.

[0011] Optionally, the moving and flipping mechanism includes a first slide rail, on which a movable frame is slidably connected. The movable frame is slidably connected to the connecting rod. A steering wheel is provided on the first slide rail, and a second slide rail is provided on the steering wheel. The second slide rail is spliced ​​with the first slide rail. After the movable frame slides to the steering wheel, it can turn, thereby driving the connecting rod to turn, so that the welding head turns towards the buffer beam.

[0012] By adopting the above technical solution, the first and second slide rails provide linear sliding tracks for the mobile frame, ensuring accurate trajectory when the welding head moves along the length of the buffer beam; the first and second slide rails are spliced ​​together, and the mobile frame can smoothly slide onto the steering wheel and complete a 180° turn, achieving a change of direction without disassembling the welding head, allowing the welding head to quickly change from a non-operating posture to an operating posture facing the buffer beam; at the same time, the position of the welding head can be adjusted through the mobile frame and connecting rod, allowing welding to be performed at different points on the buffer beam, improving welding convenience.

[0013] Optionally, the support includes a V-shaped bracket located on both sides of the clamping and flipping assembly. The V-shaped bracket is telescopic. When the V-shaped bracket is providing support, it extends, and the lowest height of the V-groove of the V-shaped bracket is higher than the top surface height of the support surface of the support frame. When the buffer beam needs to be rotated, the V-shaped bracket retracts to below the support frame. At this time, the highest point of the V-shaped bracket is lower than the top surface height of the support frame.

[0014] By adopting the above technical solution, the V-groove of the V-shaped bracket fits snugly against the outer circumference of the buffer beam, ensuring stable force during support and preventing the workpiece from slipping. Its telescopic function allows it to extend during support, with the lowest height of the V-groove exceeding the top surface of the support frame, ensuring effective lifting. When the buffer beam rotates, it retracts to below the support frame, with the highest point below the top surface of the support frame, avoiding movement interference between the V-shaped bracket and the workpiece. It combines support stability with convenience.

[0015] Optionally, the two ends of the arc rack are provided with a first stepped groove, the stepped surface of the first stepped groove penetrates the inner and outer circumferential surfaces of the arc rack, and the two ends of the rotating frame are provided with a second stepped groove, the stepped surface of the second stepped groove penetrates the inner and outer circumferential surfaces of the rotating frame, and the stepped surfaces of the first stepped groove and the second stepped groove are connected.

[0016] By adopting the above technical solution, the first stepped grooves at both ends of the arc rack and the second stepped grooves at both ends of the rotating frame are connected end to end and matched in shape, so that the four rotating frames and eight arc racks are tightly spliced ​​together; the stepped surface runs through the inner and outer circumferential surfaces of the arc rack, which can avoid the right angle or protruding structure at the end of the buffer beam and prevent the clamping of the buffer beam at the connection point from loosening; the extra protruding part formed by the stepped groove can fit into the concave area of ​​the buffer beam, supplement the clamping points, and enhance the overall clamping firmness.

[0017] Optionally, the support frame is provided with two clamping turntables, which are located at both ends of the buffer beam, and the clamping turntables can extend, retract, and rotate.

[0018] By adopting the above technical solution, two clamping turntables are positioned and clamped from both ends of the buffer beam, forming a multi-point clamping system with the clamping and flipping assembly in the middle, thus avoiding instability of the buffer beam during flipping. The clamping turntables can rotate synchronously with the buffer beam, and their rotation axis coincides with the axis of the buffer beam, ensuring that the workpiece is not eccentrically offset during the flipping process, and preventing problems such as uneven weld feet due to the tilting position of the buffer beam. At the same time, the telescopic design of the clamping turntables facilitates the rapid clamping and separation of the buffer beam, improving work efficiency.

[0019] Optionally, the clamping turntable is provided with a positioning angle on the side facing the buffer beam, and at least two positioning angles are provided, with the positioning angles corresponding to the right angles of the ends of the buffer beam.

[0020] By adopting the above technical solution, the positioning angles correspond one-to-one with the right-angle structures at the ends of the buffer beam, and at least two positioning angles form right-angle limits, which can accurately limit the translation and rotation of the buffer beam in the end plane, avoid axial or radial displacement of the workpiece during welding, and ensure the clamping and positioning accuracy of the buffer beam.

[0021] Optionally, a second sliding groove is provided on the support frame along its length direction, and a first push block and a second push block are slidably disposed in the second sliding groove. A sliding plate is disposed between the first push block and the second push block, and the sliding plate is used to support the buffer beam.

[0022] By adopting the above technical solution, the sliding plate provides a flat support surface for the buffer beam, avoiding surface contamination or scratches caused by direct contact and sliding between the buffer beam and the support frame; the first push block and the second push block in the second sliding groove move synchronously, driving the buffer beam to move smoothly by pushing the sliding plate, realizing the rapid adjustment of the welding station, ensuring that the buffer beam can quickly reach the work point, facilitating the welding head to accurately position and weld the buffer beam, reducing the time cost of manual alignment, and improving work efficiency.

[0023] A method for welding a rotating aluminum alloy rail vehicle buffer beam includes S1: hoisting the buffer beam onto a support frame and moving it to the welding station; S2: Clamp the buffer beam; S3: Weld the corresponding points of the buffer beam, and rotate the buffer beam 45° after welding. S4: Repeat S3; S5: Welding is completed when the buffer beam rotates back to the initial angle; S6: Lift the buffer beam away from the welding work area.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The support frame provides stable support for the device. The sliding of the telescopic rod and connecting rod drives the clamping and flipping assembly to clamp the buffer beam from different directions, thereby causing the buffer beam to flip and meet the welding requirements at multiple angles. The moving and flipping mechanism can drive the connecting rod to move and turn, which can either allow the clamping and flipping assembly to face the buffer beam to complete the clamping and flipping, or allow the welding head to turn around to align with the buffer beam for welding. The process can be connected without disassembling the workpiece, improving the continuity of operation. 2. The rotating frame provides the installation base. The arc rack slides along the first sliding groove. The drive gear meshes with the arc rack, and the transmission is stable and does not slip. The inner arc surface of the arc rack presses against the buffer beam, causing the buffer beam to rotate synchronously. The flipping angle is controllable, which solves the problems of laborious manual flipping of the buffer beam and difficulty in maintaining the angle, and ensures the flipping accuracy of the buffer beam. 3. Four rotating frames are spliced ​​into a ring, and eight arc-shaped toothed racks form a complete clamping ring, which evenly clamps the buffer beam and drives it to achieve a 45° rotation; after rotation, the rotating frames can be selectively separated, increasing the positioning angle and facilitating welding head operations; the support component supports the buffer beam when it rotates at 45°, maintaining its tilted stability and not interfering with subsequent rotation actions; 4. The steering wheel track and slide rail are spliced ​​together, and the movable frame can slide onto the steering wheel to complete a 180° turn. The direction of the steering wheel can be turned toward the buffer beam without disassembling the welding head. By sliding the movable frame along the slide rail and adjusting the telescopic rod, the welding head can accurately align with different points of the buffer beam, improving the convenience of welding. 5. The clamping turntable clamps the buffer beam from both ends, which can assist the buffer beam to rotate synchronously and form a multi-point clamping with the central clamping and flipping assembly, thus avoiding instability when the buffer beam flips. The positioning angle corresponds to the right angle of the end of the buffer beam, which can limit the translation and rotation of the buffer beam, prevent axial or radial displacement during welding, and ensure clamping and positioning accuracy. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0026] Figure 2 This is a schematic diagram illustrating the structure of the V-shaped bracket in an embodiment of this application.

[0027] Figure 3 This is a schematic diagram illustrating the structure of the first support platform in an embodiment of this application.

[0028] Figure 4 This is a schematic diagram illustrating the structure of the moving and flipping mechanism in an embodiment of this application.

[0029] Figure 5 This is a schematic diagram illustrating the structure of the clamping and flipping assembly in an embodiment of this application.

[0030] Figure 6 This is a schematic diagram illustrating the structure of the circular arc rack in an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Support frame; 11. First support platform; 111. Second sliding groove; 112. First push block; 113. Second push block; 114. Sliding plate; 12. Second support platform; 121. Moving and flipping mechanism; 1211. Steering wheel; 1212. Second slide rail; 1213. Second sliding tooth; 122. First slide rail; 123. First sliding tooth; 124. Moving frame; 125. Connecting rod; 1251. Welding head; 126. Telescopic push rod; 127. Positioning block; 13. Third support platform; 131. Clamping turntable; 1311. Positioning angle; 132. Telescopic rod; 133. V-shaped bracket; 2. Clamping and flipping assembly; 21. Rotating frame; 211. First sliding groove; 212. Second stepped groove; 22. Circular arc rack; 221. First stepped groove; 23. Drive gear. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0033] This application discloses a welding device and welding method for a tilting aluminum alloy rail vehicle buffer beam.

[0034] like Figures 1 to 3 A welding device for a tilting aluminum alloy rail vehicle buffer beam includes a support frame 1. The support frame 1 includes a first support platform 11, a second support platform 12, and a third support platform 13. Four first support platforms 11 are provided, arranged side by side, and all are perpendicular to the length direction of the buffer beam. The third support platform 13 is arranged side by side with the first support platforms 11 and is located on both sides of the four first support platforms 11. The second support platforms 12 are located at both ends of the first support platforms 11, and the length of the second support platform 12 is greater than the length of the buffer beam.

[0035] The first support platform 11 has a second sliding groove 111 along its length. A first push block 112, a second push block 113, and a sliding plate 114 are slidably disposed in the second sliding groove 111. The sliding plate 114 is located between the first push block 112 and the second push block 113, and the height of the first push block 112 and the second push block 113 is higher than the height of the sliding plate 114. The sliding plate 114 is used to place the buffer beam to avoid direct contact and friction between the buffer beam and the first support platform 11, which would cause scratches on the buffer beam. The first push block 112 and the second push block 113 push the sliding plate 114 to move, thereby driving the buffer beam to move synchronously, thereby realizing the adjustment of the position of the buffer beam.

[0036] like Figure 4 A movable tilting mechanism 121 is provided on the second support platform 12. The movable tilting mechanism 121 includes a steering wheel 1211, which is rotatably connected to the second support platform 12. The top surface of the steering wheel 1211 is at the same level as the top surface of the second support platform 12. A first slide rail 122 is fixedly connected to the second support platform 12, and a second slide rail 1212 is fixedly connected to the steering wheel 1211. The first slide rail 122 and the second slide rail 1212 are joined together. The upper surface of the first slide rail 122... A first sliding tooth 123 is connected to the center of the surface along its length, and a second sliding tooth 1213 is connected to the center of the upper surface of the second slide rail 1212. The first sliding tooth 123 and the second sliding tooth 1213 are spliced ​​together. The first sliding tooth 123 and the second sliding tooth 1213 have both axial symmetry and central symmetry characteristics. That is, when the steering wheel 1211 drives the second sliding tooth 1213 to rotate 180°, the first sliding tooth 123 can still maintain a continuous splicing state with the rotated second sliding tooth 1213. Two movable frames 124 are slidably connected to the first slide rail 122. A positioning block 127 is slidably connected to the movable frame 124. A telescopic push rod 126 is fixedly connected to the positioning block 127, and a connecting rod 125 is slidably connected to it. The positioning block 127 can drive the telescopic push rod 126 and the connecting rod 125 to move up and down along the length of the movable frame 124. One end of the telescopic push rod 126 is fixedly connected to the connecting rod 125, which can drive the connecting rod 125 to move. A welding head 1251 is connected to the end of the connecting rod 125 away from its fixed point with the telescopic push rod 126. When the movable frame 124 moves to the steering wheel 1211 for turning, the connecting rod 125 follows the movable frame 124 and turns synchronously, so that the welding head 1251 turns towards the buffer beam for welding operations.

[0037] like Figure 1 and Figure 2Two clamping turntables 131 are connected to the third support platform 13. The two clamping turntables 131 are located at both ends of the buffer beam and can be extended and retracted. The end of the clamping turntable 131 facing the buffer beam abuts against the end of the buffer beam. Four positioning angles 1311 are provided on the clamping turntable 131, which correspond to the four corners of the buffer beam. The four positioning angles 1311 together clamp the buffer beam. Two sets of telescopic rods 132 are also connected to the third support platform 13. Each set of telescopic rods 132 has two rods, and the two telescopic rods 132 in each set are located above and below the buffer beam, respectively.

[0038] Two sets of V-shaped brackets 133 are also connected to the third support platform 13. Each set of V-shaped brackets 133 has two members. The two V-shaped brackets 133 are located on both sides of the telescopic rod 132 below the buffer beam. The V-shaped brackets 133 can extend and retract. When the V-shaped brackets 133 are extended, the highest height of the lowest point of the V-groove is higher than the top surface height of the first support platform 11. When the V-shaped brackets 133 are retracted, the lowest height of the highest point of the V-groove is lower than the top surface height of the first support platform 11.

[0039] like Figure 1 , Figure 5 and Figure 6 Each of the two telescopic rods 132 and the two connecting rods 125 is connected to a clamping and flipping assembly 2. Each clamping and flipping assembly 2 is a quarter ring, and the four clamping and flipping assemblies 2 are spliced ​​together to form a ring. The clamping and flipping assembly 2 includes a rotating frame 21. A first sliding groove 211 is opened on the inner circumferential surface of the rotating frame 21. Two arc racks 22 are slidably arranged in the first sliding groove 211. The teeth of the arc racks 22 are arranged on their outer circumferential surface. The inner circumferential surface of the arc racks 22 abuts against the buffer beam. A drive gear 23 is rotatably connected to the rotating frame 21. The drive gear 23 meshes with the arc racks 22. The drive gear 23 drives the arc racks 22 to slide in the first sliding groove 211, thereby driving the buffer beam to flip. The first sliding grooves 211 opened on the four rotating frames 21 together form an annular groove. The eight arc racks 22 set in the annular groove can drive the buffer beam to achieve rotation at various angles. At the same time, when the buffer beam rotates by 45°, the setting of the eight arc racks 22 does not affect the separation between the four rotating frames 21. After the buffer beam rotates by 45°, it can cooperate with the V-shaped bracket 133 to achieve fixed angle support for the eight angles of the buffer beam.

[0040] The arc rack 22 has first stepped grooves 221 at both ends. The stepped surface of the first stepped groove 221 penetrates the inner and outer circumferential surfaces of the arc rack 22. The arc rack 22 is centrally symmetrical. Adjacent first stepped grooves 221 interlock with each other through stepped surfaces to achieve precise positioning and connection between the arc racks 22. When the eight arc racks 22 are connected end to end in the annular groove, they form a continuous annular meshing surface. The rotating frame 21 has second stepped grooves 212 at both ends. The stepped surface of the second stepped groove 212 is equal to the stepped surface of the first stepped groove 221. When the arc rack 22 slides to the end of the rotating frame 21, the first stepped groove 221 can connect with the second stepped groove 212 to ensure that the eight arc racks 22 can be smoothly separated when the four rotating frames 21 are separated.

[0041] The stepped surface runs through the inner and outer circumferential surfaces of the arc rack 22, avoiding the right angle or protruding structure at the end of the buffer beam and preventing the clamping of the buffer beam at the joint from loosening; the extra protruding part formed by the stepped groove can fit into the concave area of ​​the buffer beam, supplementing the clamping points and enhancing the overall clamping firmness.

[0042] The implementation principle of this application embodiment is as follows: First, the V-shaped bracket 133 on the third support platform 13 is adjusted to the retracted state, so that the lowest height of the highest point of its V groove is lower than the top surface height of the first support platform 11, providing sufficient operating space for loading the buffer beam. The aluminum alloy rail vehicle buffer beam to be welded is placed on the sliding plate 114 of the first support platform 11. The sliding plate 114 can effectively isolate the buffer beam from direct contact with the first support platform 11, avoid surface scratches caused by friction and sliding, and realize the safe bearing of the buffer beam. After the buffer beam is placed, the sliding plate 114 is pushed smoothly along the second sliding groove 111 by the first push block 112 and the second push block 113, driving the buffer beam to move to the welding station.

[0043] After the buffer beam reaches the welding station, the connecting frame can be driven to move along the first and second guide rails to the steering wheel 1211. The steering wheel 1211 is turned so that the welding head 1251 faces the buffer beam for welding. After the welding work on one side is completed, the moving frame 124 is controlled to move to the steering wheel 1211 for turning so that the rotating frame 21 on the connecting rod 125 faces the buffer beam. The telescopic rod 132 and the telescopic push rod 126 are controlled to drive the four rotating frames 21 to move towards the buffer beam. The four rotating frames 21 together surround the buffer beam and clamp it. At this time, the first stepped groove 221 of the arc rack 22 is precisely connected with the second stepped groove 212 of the rotating frame 21. The drive gear 23 is controlled to drive the arc rack 22 to slide along the first sliding groove 211 to the end of the rotating frame 21. Then the telescopic rod 132 and the connecting rod 125 drive the four rotating frames 21 to separate radially along the buffer beam. The eight arc racks 22 follow the corresponding rotating frames 21 to separate smoothly and synchronously, releasing the clamping of the buffer beam.

[0044] The drive gear 23 drives the arc rack 22 to slide in the first sliding groove 211. The inner circumferential surface of the arc rack 22 presses against the buffer beam and drives the buffer beam to rotate. When the buffer beam rotates to a non-horizontal angle such as 45°, the V-shaped bracket 133 is controlled to extend so that the highest height of the lowest point of its V groove is higher than the top surface of the first support platform 11. The V groove fits against the outer circumferential surface of the buffer beam to form a stable support, preventing the buffer beam from shifting due to gravity caused by the angle tilt. At this time, the four rotating frames 21 can be separated from the buffer beam, and the eight arc racks 22 are separated synchronously with the rotating frames 21. The rotating frames 21 are controlled to move again to the steering wheel 1211 to turn, so that the welding head 1251 rotates again to face the buffer beam to weld the buffer beam. After the welding at this angle is completed, the above-mentioned flipping and welding steps are repeated until all surfaces to be welded are completed.

[0045] After welding is completed, the buffer beam is rotated to the initial angle, the four rotating frames 21 are separated from the buffer beam, the buffer beam is placed on the sliding plate 114, and the second sliding plate 114 is pushed away from the welding station to unload the buffer beam.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A welding device for tilting aluminum alloy rail vehicle buffer beams, characterized in that: The system includes a support frame (1), on which a plurality of telescopic rods (132) and a plurality of connecting rods (125) are slidably arranged. Each of the telescopic rods (132) and each of the connecting rods (125) is connected to a clamping and flipping assembly (2). The plurality of clamping and flipping assemblies (2) together drive the buffer beam to flip. A welding head (1251) is connected to the connecting rod (125), and the welding head (1251) is located at the end of the connecting rod (125) away from the clamping and flipping assembly (2). A moving and flipping mechanism (121) is connected to the support frame (1), and the moving and flipping mechanism (121) is used to drive the connecting rod (125) to move and flip.

2. The welding device for tilting aluminum alloy rail vehicle buffer beams according to claim 1, characterized in that: The clamping and flipping assembly (2) includes a rotating frame (21), on which a first sliding groove (211) is provided, and an arc rack (22) is provided in the sliding groove. A drive gear (23) is connected to the rotating frame (21), and the drive gear (23) meshes with the arc rack (22). The inner arc surface of the arc rack (22) abuts against the buffer beam.

3. The welding device for tilting aluminum alloy rail vehicle buffer beams according to claim 2, characterized in that: The rotating frame (21) is provided in four parts, and the four rotating frames (21) have the same structure. The four rotating frames (21) are spliced ​​into a ring. The first sliding groove (211) opened on the rotating frame (21) is also spliced ​​into an annular groove. The circular arc rack (22) is provided in eight parts. All eight circular arc racks (22) are set in the first sliding groove (211) and are spliced ​​together to form a ring. The support frame (1) is provided with a support member (14). When the buffer beam is rotated 45°, the support member (14) can support the buffer beam that has rotated 45°.

4. The welding device for tilting aluminum alloy rail vehicle buffer beams according to claim 1, characterized in that: The moving and flipping mechanism (121) includes a first slide rail (122), on which a moving frame (124) is slidably connected. The moving frame (124) is slidably connected to the connecting rod (125). A steering wheel (1211) is provided on the first slide rail (122), and a second slide rail (1212) is provided on the steering wheel (1211). The second slide rail (1212) is spliced ​​with the first slide rail (122). After the moving frame (124) slides to the steering wheel (1211), it can turn, thereby driving the connecting rod (125) to turn, so that the welding head (1251) turns towards the buffer beam.

5. The welding device for tilting aluminum alloy rail vehicle buffer beams according to claim 3, characterized in that: The support member (14) includes a V-shaped bracket (133), which is located on both sides of the clamping and flipping assembly (2). The V-shaped bracket (133) can extend and retract. When the V-shaped bracket (133) provides support, it extends. The lowest height of the V-groove of the V-shaped bracket (133) is higher than the top surface height of the support surface of the support frame (1). When the buffer beam needs to be rotated, the V-shaped bracket (133) retracts to below the support frame (1). At this time, the height of the highest point of the V-shaped bracket (133) is lower than the top surface height of the support frame (1).

6. The welding device for tilting aluminum alloy rail vehicle buffer beams according to claim 2, characterized in that: The circular arc rack (22) has a first stepped groove (221) at both ends, and the stepped surface of the first stepped groove (221) penetrates the inner and outer circumferential surfaces of the circular arc rack (22). The rotating frame (21) has a second stepped groove (212) at both ends, and the stepped surface of the second stepped groove (212) penetrates the inner and outer circumferential surfaces of the rotating frame (21). The stepped surfaces of the first stepped groove (221) and the stepped surfaces of the second stepped groove (212) are connected.

7. The welding device for tilting aluminum alloy rail vehicle buffer beams according to claim 1, characterized in that: The support frame (1) is provided with two clamping turntables (131), which are located at both ends of the buffer beam. The clamping turntables (131) can extend, retract and rotate.

8. The welding device for tilting aluminum alloy rail vehicle buffer beams according to claim 7, characterized in that: The clamping turntable (131) has a positioning angle (1311) on the side facing the buffer beam. There are at least two positioning angles (1311), and the positioning angles (1311) are perpendicular to the ends of the buffer beam.

9. The welding device for tilting aluminum alloy rail vehicle buffer beams according to claim 1, characterized in that: The support frame (1) has a second sliding groove (111) along its length direction. A first push block (112) and a second push block (113) are slidably disposed in the second sliding groove (111). A sliding plate (114) is disposed between the first push block (112) and the second push block (113). The sliding plate (114) is used to support the buffer beam.

10. A method for welding a tilting aluminum alloy rail vehicle buffer beam, applied to the welding device for tilting aluminum alloy rail vehicle buffer beams as described in any one of claims 1-9, characterized in that: Including S1: hoisting the buffer beam onto the support frame (1) and moving it to the welding station; S2: Clamp the buffer beam; S3: Weld the corresponding points of the buffer beam, and rotate the buffer beam 45° after welding. S4: Repeat S3; S5: Welding is completed when the buffer beam rotates back to the initial angle; S6: Lift the buffer beam away from the welding work area.

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