Welding device and welding method for skin inner stiffening beam

Abstract

The invention discloses a welding device and a welding method for a stiffening beam in a skin, and relates to the technical field of skin welding, the welding device comprises a positioning mandrel, the periphery of the positioning mandrel is provided with a positioning clamping groove, the positioning clamping groove comprises a pair of centering clamps, the centering clamps are symmetrically arranged relative to the vertical center section of the stiffening beam, and the centering clamps are used for clamping the two sides of the stiffening beam in an attached mode; the jacking block is movably arranged on the periphery of the positioning mandrel, the jacking block reciprocates on the vertical central section of the stiffening beam, and the jacking block is used for supporting the stiffening beam; the pull rod is movably arranged in the positioning mandrel, a centering wedge-shaped block and a jacking wedge-shaped block are arranged on the pull rod, the centering wedge-shaped block is movably arranged between the pair of centering clamps, the centering wedge-shaped block is matched with the centering clamps in an abutting mode, and the inclined face of the jacking wedge-shaped block is attached to the bottom of the jacking block; the headstock and the tailstock are connected with the two ends of the positioning mandrel; according to the welding device, the process can be simplified, and the consistency of products can be well controlled.

Description

Technical Field

[0001] The present invention belongs to the technical field of skin welding, and more specifically, relates to a welding device and a welding method for a skin inner reinforcement beam. Background Art

[0002] The surface of the T-beam is covered with a skin and welded. At this stage, it is still done manually. It is necessary to weld four T-beams with a length close to the rectangular tube at the four corners of the rectangular tube in a circumferentially closed rectangular tube. The welding position of the T-beam is consistent with the length direction of the rectangular tube, and the length of the T-beam is similar to the length of the rectangular tube. The existing welding process is: first, a piece of cut metal skin is made with the beam position line on the surface, and the angle of pre-bending and welding (similar to the C-shape) is pre-pressed, so that half of the structure of the rectangular tube can be formed, and two T-beams are placed for welding; after a single group of C-shaped skins are welded to the T-beams in the length direction, the two groups of welded C-shaped skins are fixed on the forming tooling in a cross shape with the T-beams as the reference; finally, the skins are welded together to form a complete rectangular tube, and finally the T-beams are driven by the tooling to expand the skin into shape (the expanded cross section is as follows: Figure 1 described above).

[0003] At present, due to the small output, there is no special machine and manual operation is still used. Since the internal space of the molded product is small and the length is long (rectangular tubes are welded with long ribs in the length direction), it is difficult to achieve accurate and reliable welding operations with a long welding gun inside the long tube. In order to achieve a good welding effect between the T-beam and the skin, the process flow is relatively complicated, and it is necessary to go through the skin marking and bending, T-beam alignment, T-beam welding, closing welding, and opening molding. There are many manual processes, and the difficulty in controlling the size of the process leads to large differences in the size after molding, making it difficult to ensure the consistency of the product. Summary of the invention

[0004] The purpose of the present invention is to provide a welding device and a welding method for a skin inner reinforcement beam in view of the deficiencies in the prior art. The welding device can simplify the process and can well control the consistency of the product.

[0005] In order to achieve the above object, the present invention provides a welding device for a reinforcing beam inside a skin, wherein the skin is a tubular structure, and the reinforcing beam is arranged inside the skin, comprising: A positioning mandrel, the outer periphery of which is provided with a positioning slot, the positioning slot includes a pair of centering clips, the pair of centering clips are symmetrically arranged with respect to the vertical center section of the reinforcing beam, the pair of centering clips move synchronously in opposite directions, and the centering clips are used to clamp and fix the two sides of the reinforcing beam; A lifting block is movably arranged on the outer periphery of the positioning mandrel, the lifting block reciprocates on the vertical center section of the reinforcing beam, and the lifting block is used to support the reinforcing beam; A pull rod, movably arranged inside the positioning mandrel, a centering wedge block and a lifting wedge block are arranged on the pull rod, the centering wedge block is movably arranged between a pair of centering clamps, the centering wedge block abuts against the centering clamps, and the inclined surface of the lifting wedge block fits with the bottom of the lifting block; The headstock and the tailstock are connected to the two ends of the positioning mandrel.

[0006] Optionally, the positioning mandrel is arranged inside the skin, and a plurality of positioning slots and a plurality of lifting blocks are evenly arranged on the outer circumference of the positioning mandrel.

[0007] Optionally, a plurality of pairs of rotating shaft fixing seats are arranged on the periphery of the positioning core shaft, the centering clamp is T-shaped, the middle part of the vertical block of the centering clamp is hinged on the rotating shaft fixing seat, the vertical blocks of each pair of the centering clamps are arranged in an eight-shape, the horizontal blocks of the centering clamps are used to fit with the reinforcing beam, each pair of the centering clamps is arranged corresponding to each pair of the rotating shaft fixing seats, and two adjacent pairs of the centering clamps are connected by a centering clamp contraction spring.

[0008] Optionally, the centering wedge block is slidably arranged between the rotating shaft fixing seats, and the two sides of the centering wedge block are successively provided with a first plane, a sloped plane and a second plane, the distance between the first planes on both sides is smaller than the distance between the second planes on both sides, and the two sides of the centering wedge block are in contact with the bottom of the vertical block of the centering clamp.

[0009] Optionally, a limiting block is arranged on the periphery of the positioning mandrel, a limiting groove is provided in the center of the limiting block, the lifting block is slidingly fitted in the limiting groove, and a spring is arranged between the lifting block and the positioning mandrel.

[0010] Optionally, the positioning slot and the lifting block are spaced apart, and removable end limit covers are provided at both ends of the positioning mandrel, and the end limit covers cooperate with the pull rod.

[0011] Optionally, an oil cylinder is provided in the head seat, the oil cylinder is connected to the pull rod, and the oil cylinder drives the pull rod to telescopic movement.

[0012] Optionally, a turning machine is further provided in the headstock, an output end of the turning machine is connected to the positioning mandrel, and the tailstock comprises a mandrel centering frame, and the mandrel centering frame is rollingly fitted with the end of the positioning mandrel.

[0013] The present invention also provides a method for welding a skin inner reinforcement beam, using the above-mentioned welding device for the skin inner reinforcement beam, the welding method comprises: Placing the reinforcing beam in the positioning slot; Sleeve the skin on the outer periphery of the positioning mandrel; The pull rod is pulled out from the positioning mandrel, the centering clamp clamps and fixes the reinforcing beam, the lifting block drives the reinforcing beam to lift outward, and the reinforcing beam spreads the skin; After the reinforcing beam and the skin reach a set size, welding the skin area where the reinforcing beam is provided; After welding one of the reinforcing beams, the skin is driven to rotate by the head seat and the tail seat to continue welding the next area where the reinforcing beam is arranged; After all the reinforcing beams are welded, the pull rod is returned to the positioning mandrel, and the skin welded with the reinforcing beams is removed from the positioning mandrel.

[0014] Optionally, the skin region provided with the reinforcing beam is welded using equipment equipped with laser penetration welding connection technology.

[0015] The present invention provides a welding device and a welding method for an inner reinforcement beam of a skin, and the beneficial effects are: the welding device is combined with a new process flow and a new welding technology, and adopts laser penetration welding technology, so that the welding and fixing of the inner reinforcement beam can be achieved without the need for a welding gun to enter the interior of the skin, thereby simplifying the original complex manual production process and achieving control over the consistency of the final product, and combining the positioning of the T-beam with the inner support forming mold and the welding fixture, thereby making a breakthrough change in the manufacturing process.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0018] Figure 1 A schematic structural diagram of a skin welded with four T-beams according to an embodiment of the present invention is shown.

[0019] Figure 2 A schematic structural diagram of a T-beam according to an embodiment of the present invention is shown.

[0020] Figure 3 A schematic diagram of the external structure of a positioning mandrel according to an embodiment of the present invention is shown.

[0021] Figure 4 Shows Figure 3 Enlarged view of point A.

[0022] Figure 5 Shows Figure 4 sectional view of .

[0023] Figure 6 A schematic structural diagram of a welding device for a skin inner reinforcement beam according to an embodiment of the present invention is shown.

[0024] Figure 7 A diagram showing the positional relationship between a positioning mandrel and a barrel bottom limit and a barrel end limit according to an embodiment of the present invention is shown.

[0025] Figure 8 A diagram showing the positional relationship between a centering clip and a centering wedge block according to an embodiment of the present invention is shown.

[0026] Description of reference numerals: 1. Skin; 2. T-beam; 3. Positioning mandrel; 4. Pull rod; 5. Head seat; 6. Tail seat; 7. Centering clamp; 8. Bottom limiter; 9. Cylinder; 10. Lifting block; 11. Lifting wedge block; 12. End limiter; 13. Mandrel centering frame; 14. Centering clamp retraction spring; 15. Centering wedge block; 16. Inclined surface; 17. Rotating shaft fixing seat; 18. Vertical center section; 19. Limiter. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0028] The present invention provides a welding device for a reinforcing beam inside a skin, wherein the skin is a tubular structure, and the reinforcing beam is arranged inside the skin, comprising: A positioning mandrel is provided with a positioning slot on the outer periphery, the positioning slot includes a pair of centering clamps, the pair of centering clamps are symmetrically arranged with respect to the vertical center section of the reinforcing beam, the pair of centering clamps move synchronously in opposite directions, and the centering clamps are used to fit and clamp the two sides of the reinforcing beam; A lifting block is movably arranged on the outer periphery of the positioning mandrel, and the lifting block reciprocates on the vertical center section of the reinforcing beam, and the lifting block is used to support the reinforcing beam; A pull rod is movably arranged inside the positioning mandrel, and a centering wedge block and a lifting wedge block are arranged on the pull rod. The centering wedge block is movably arranged between a pair of centering clamps, the centering wedge block abuts against the centering clamp, and the inclined surface of the lifting wedge block fits with the bottom of the lifting block; The headstock and the tailstock are connected to both ends of the positioning mandrel.

[0029] Specifically, the welding device welds multiple reinforcing beams in a tubular skin, and there is no need to split the tubular skin into two C-shaped structures in the existing welding process, and then align and splice the two C-shaped structures into a tubular skin after welding the corresponding reinforcing beams. The welding device includes a positioning mandrel and a pull rod, the pull rod is movably inserted in the positioning mandrel, and the pull rod moves along the axial direction of the positioning mandrel. A pair of centering clamps and lifting blocks are provided on the outer surface of the positioning mandrel. The centering clamps are used to guide the reinforcing beams, and the lifting blocks are used to lift the reinforcing beams to fit the inner side of the tubular skin. In this way, the centering clamps ensure the circumferential position of the reinforcing beams in the skin, and the lifting blocks ensure the radial position of the reinforcing beams in the skin; a centering wedge block and a lifting wedge block are provided on the pull rod, and the centering wedge block corresponds to the centering clamp. When the pull rod is pulled in the positioning mandrel, the centering wedge block will drive the pull rod through its own profile. The centering clamps move in opposite directions, so that the two centering clamps can limit the central reinforcement beam and restrict the reinforcement beam to the set circumferential position. At the same time, the lifting wedge block on the tie rod cooperates with the lifting block. Similarly, when the tie rod is pulled in the positioning mandrel, the lifting wedge block also drives the lifting block to move through its own profile, but the lifting block moves along the radial direction of the tubular skin. During the movement of the tie rod, the lifting wedge block slowly lifts the lifting block, and the lifting block then pushes the reinforcement beam outward, so that the reinforcement beam fits the inner side of the tubular skin and lifts and supports the reinforcement beam to the set radial position. After the reinforcement beam and the tubular skin are fixed and positioned, the positioning mandrel and the tie rod are placed between the head seat and the tail seat, and the areas where the reinforcement beam is set are welded in the skin in turn by rotation. The entire welding process is on the outside of the skin.

[0030] Optionally, the positioning mandrel is arranged inside the skin, and a plurality of positioning slots and a plurality of lifting blocks are evenly arranged on the outer circumference of the positioning mandrel.

[0031] Optionally, the positioning slot and the lifting block are arranged at intervals, and removable end limit covers are arranged at both ends of the positioning mandrel, and the end limit covers cooperate with the pull rod.

[0032] Specifically, before welding the reinforcing beams inside the tubular skin, it is necessary to place the reinforcing beams on the positioning mandrel. According to the number of reinforcing beams, multiple groups of positioning structures are set on the outer surface of the positioning mandrel. Each group of positioning structures is parallel to the axis of the positioning mandrel. Each group of positioning structures includes multiple pairs of centering clamps and multiple lifting blocks, and the centering clamps and the lifting blocks are spaced apart. In this way, when the pull rod moves in the positioning mandrel, the centering clamps and the lifting blocks can push the support beams outward along the set direction, thereby lifting the support beams to the set position.

[0033] Optionally, multiple pairs of rotating shaft fixing seats are arranged on the outer periphery of the positioning core shaft, the centering clamp is T-shaped, the middle part of the vertical block of the centering clamp is hinged on the rotating shaft fixing seat, the vertical blocks of each pair of centering clamps are arranged in an eight-shape, and the horizontal block of the positioning frame is used to fit with the reinforcing beam. Each pair of centering clamps is arranged corresponding to each pair of rotating shaft fixing seats, and two adjacent pairs of centering clamps are connected by a centering clamp contraction spring.

[0034] Optionally, the centering wedge block is slidably set between the rotating shaft fixing seats, and the first plane, the inclined plane and the second plane are sequentially arranged on both sides of the centering wedge block, the distance between the first planes on both sides is smaller than the distance between the second planes on both sides, and the two sides of the centering wedge block are in contact with the bottom of the vertical block of the centering clamp.

[0035] Specifically, the outer surface of the positioning core shaft is connected with the centering clamp through the rotating shaft fixing seat, and the rotating shaft fixing seat is also arranged in pairs. The paired rotating shaft fixing seats are arranged on both sides of the reinforcing beam. The connecting end of the rotating shaft fixing seat and the centering clamp is provided with a U-shaped opening, and the centering clamp is embedded in the U-shaped opening of the rotating shaft fixing seat. The vertical block of the centering clamp is hingedly connected with the rotating shaft fixing seat. When the lower part of the hinge point of the paired centering clamp is relatively opened outward, the upper part of the hinge point of the centering clamp will be retracted inward; centering clamp contraction springs are respectively arranged on the outer sides of the paired centering clamps, and the adjacent paired centering clamps are connected by the centering clamp contraction springs. When the pull rod does not move in the positioning core shaft, the positioning wedge block does not contact the lower part of the hinge point of the centering clamp. Under the action of the compression spring, the paired centering clamps open outwardly to each other, which makes it easier to place the reinforcing beam in the positioning slot. When the pull rod moves in the positioning core shaft, the inclined surface of the positioning wedge block begins to contact the lower part of the hinge point of the centering clamp. As the opening angle of the inclined surface becomes larger and larger, the distance between the paired centering clamps becomes smaller and smaller. When the second plane of the positioning wedge block contacts the lower part of the hinge point of the centering clamp, the distance between the paired centering clamps remains unchanged, and the centering clamps fit together on both sides of the vertical block of the reinforcing beam, so that the circumferential position of the reinforcing beam can be limited. However, the centering clamp does not completely clamp the reinforcing beam, but only serves to position and guide the reinforcing beam. The reinforcing beam will also be pushed out to the outside of the tubular skin as the lifting block moves.

[0036] Optionally, a limiting block is arranged on the periphery of the positioning mandrel, a limiting groove is provided in the center of the limiting block, the lifting block is slidingly fitted in the limiting groove, and a spring is arranged between the lifting block and the positioning mandrel.

[0037] Specifically, a limiting hole for guiding the movement of the jacking block is also provided on the positioning core shaft, and the jacking block passes through the limiting groove of the limiting hole. When the jacking wedge block lifts the jacking block, the limiting groove ensures that the jacking block only moves along the radial direction of the tubular skin. After the pull rod moves into place from the positioning core shaft, the reinforcing beam can move to the set position. When the lifting wedge block is not in contact with the jacking block, the lifting block can be retracted into place under the action of the spring, ensuring that the reinforcing beam is installed in place in the positioning slot.

[0038] Optionally, an oil cylinder is provided in the head seat, the oil cylinder is connected to the pull rod, and the oil cylinder drives the pull rod to telescope.

[0039] Optionally, a turning machine is further provided in the headstock, the output end of the turning machine is connected to the positioning mandrel, and the tailstock comprises a mandrel centering frame, and the mandrel centering frame is rollingly fitted with the end of the positioning mandrel.

[0040] Specifically, the welding device sets a positioning mandrel with a pull rod on a head seat, first places the reinforcing beam in the positioning groove on the outer periphery of the positioning mandrel, pulls the pull rod by a cylinder to achieve preliminary fixation of the reinforcing beam, and then puts the skin on the outside of the positioning mandrel, and continues to pull the pull rod by the cylinder until it moves into place in the positioning mandrel, so that the reinforcing beam is supported and fixed in place in the skin, and then the relative positions of the skin, positioning mandrel and pull rod are fixed by the end limit cover, and finally the mandrel centering frame of the tail seat is raised, so that when the turning machine drives the positioning mandrel to rotate, the tail seat can support the positioning mandrel and provide auxiliary rotation support to ensure stable rotation of the skin.

[0041] The present invention also provides a method for welding a skin inner reinforcement beam, using the above-mentioned welding device for the skin inner reinforcement beam, the welding method comprises: Place the reinforcement beam in the positioning slot; Slip the skin onto the outer circumference of the positioning mandrel; Pull the tie rod out of the positioning mandrel, the centering clamp clamps the reinforcement beam, the lifting block drives the reinforcement beam to lift outward, and the reinforcement beam spreads the skin; After the reinforcement beam and the skin reach the set size, the skin area where the reinforcement beam is provided is welded; After welding one reinforcement beam, the skin is rotated by the headstock and tailstock to continue welding the next area with the reinforcement beam. After all the reinforcing beams are welded, the pull rod is returned to the positioning mandrel, and the skin with the reinforcing beams welded thereto is removed from the positioning mandrel.

[0042] Optionally, the skin area provided with the reinforcing beam is welded using equipment equipped with laser penetration welding connection technology. Example

[0043] like Figures 1 to 8As shown, the present invention provides a welding device for reinforcing beams inside a skin, the skin 1 is a tubular structure, the reinforcing beam is a T-beam 2, the welding device needs to evenly weld four T-beams 2 on the inner side of the skin 1, and the welding operation process is: Place the T-beam 2 in the positioning slot of the positioning mandrel 3, which is distributed in a cross shape on the positioning mandrel 3, and move the pull rod 4 toward the head seat 5 for a distance, so that the centering clamp 7 can exert a certain clamping force on the T-beam 2, so that the T-beam 2 will not fall off the positioning mandrel 3; then, put the pre-stressed skin 1 on the outer periphery of the positioning mandrel 3, and abut the end of the skin 1 against the limit stop 8 at the bottom of the tube, start the cylinder 9 and continue to move the pull rod 4 toward the head seat 5, so that the jacking block 10 slowly lifts the T-beam 2 through the jacking wedge block 11, and fits it to the inner side of the skin 1, and then covers the limit stop 12 at the end of the tube; finally, lift the mandrel centering frame 13 of the tail seat 6; continue The pull rod 4 is pulled by the oil cylinder 9 to make the T-beam 2 continue to rise and expand the circular skin 1 into a diamond structure, until the T-beam 2 and the skin 1 reach the set size; subsequently, the equipment equipped with laser penetration welding connection technology is used to directly weld the fitting surface of the T-beam 2 and the skin 1 on the outside; after the welding machine completes the welding of a T-beam 2, the entire tooling is changed in angle through the turning machine of the head seat 5 to continue welding; after all the welding is completed, the core shaft centering frame 13 of the tail seat 6 is lowered, the tube end limit 12 is removed, and the oil cylinder 9 controls the pull rod 4 to move toward the tail seat, so that the ejected centering clamp 7 and the lifting block 10 are returned to a free state by the spring, and the welded workpiece can be pulled out manually in this way.

[0044] In this embodiment, when the pull rod 4 does not move in the positioning core shaft 3, under the action of the centering clamp contraction spring 14, the centering clamp 7 is in a natural state and is pulled outward to maximize the distance between the centering clamps 7, thereby facilitating the insertion of the T-beam 2; when the pull rod 4 is driven in the positioning core shaft 3, the centering wedge block 15 fits with the bottom of the centering clamp 7 through the inclined surface 16, and the centering clamp 7 rotates about the center of the hinge axis of the centering clamp 7 and the rotating shaft fixing seat 17, and the two paired centering clamps 7 approach the center until the designed width, thereby clamping the T-beam 2.

[0045] In this embodiment, under the action of the spring, the lifting block 10 is pulled toward the inner side of the positioning core shaft 3 by the spring. When the lifting wedge block 11 is driven by the pull rod 4, the lifting wedge block 11 lifts the lifting block 10 through its own inclined surface, thereby lifting the T-beam 2 and fitting it to the inner side of the skin 1; the limit block 19, the rotating shaft fixing seat 17, the spring and the bottom limit 8 of the cylinder are fixed on the positioning core shaft 3, and the positioning core shaft 3 is fixed on the head seat 5 and does not move; the cylinder 9 is fixed inside the head seat 5, and the cylinder 9 only realizes the pulling operation of the pull rod 4, so as to realize the forward and backward movement of the pull rod 4 along the axial direction of the positioning core shaft 3.

[0046] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A welding device for reinforcing beams inside a skin, wherein the skin is a tubular structure and the reinforcing beams are arranged inside the skin, characterized in that: include: A positioning mandrel, the outer periphery of which is provided with a positioning slot, the positioning slot includes a pair of centering clips, the pair of centering clips are symmetrically arranged with respect to the vertical center section of the reinforcing beam, the pair of centering clips move synchronously in opposite directions, and the centering clips are used to clamp and fix the two sides of the reinforcing beam; A lifting block is movably arranged on the outer periphery of the positioning mandrel, the lifting block reciprocates on the vertical center section of the reinforcing beam, and the lifting block is used to support the reinforcing beam; A pull rod, movably arranged inside the positioning mandrel, a centering wedge block and a lifting wedge block are arranged on the pull rod, the centering wedge block is movably arranged between a pair of centering clamps, the centering wedge block abuts against the centering clamps, and the inclined surface of the lifting wedge block fits with the bottom of the lifting block; The headstock and the tailstock are connected to the two ends of the positioning mandrel.

2. The welding device for the inner reinforcement beam of the skin according to claim 1, characterized in that: The positioning mandrel is arranged inside the skin, and a plurality of positioning slots and a plurality of lifting blocks are evenly arranged on the outer circumference of the positioning mandrel.

3. The welding device for the inner reinforcement beam of the skin according to claim 1, characterized in that: A plurality of pairs of rotating shaft fixing seats are arranged on the outer periphery of the positioning core shaft, the centering clamp is T-shaped, the middle part of the vertical block of the centering clamp is hinged on the rotating shaft fixing seat, the vertical blocks of each pair of the centering clamps are arranged in an eight-shape, the horizontal blocks of the centering clamps are used to fit with the reinforcing beam, each pair of the centering clamps is arranged corresponding to each pair of the rotating shaft fixing seats, and two adjacent pairs of the centering clamps are connected by a centering clamp contraction spring.

4. The welding device for the inner reinforcement beam of the skin according to claim 3, characterized in that: The centering wedge block is slidably arranged between the rotating shaft fixing seats, and a first plane, an inclined plane and a second plane are sequentially arranged on both sides of the centering wedge block, a distance between the first planes on both sides is smaller than a distance between the second planes on both sides, and both sides of the centering wedge block are in contact with the bottom of the vertical block of the centering clamp.

5. The welding device for the inner reinforcement beam of the skin according to claim 1, characterized in that: A limiting block is arranged on the outer periphery of the positioning mandrel, a limiting groove is arranged in the center of the limiting block, the lifting block is slidingly fitted in the limiting groove, and a spring is arranged between the lifting block and the positioning mandrel.

6. The welding device for the inner reinforcement beam of the skin according to claim 1, characterized in that: The positioning slot and the lifting block are arranged at intervals, and detachable end limit covers are arranged at both ends of the positioning mandrel, and the end limit covers are matched with the pull rod.

7. The welding device for the inner reinforcement beam of the skin according to claim 1, characterized in that: An oil cylinder is arranged in the head seat, and the oil cylinder is connected to the pull rod, and the oil cylinder drives the pull rod to telescopic movement.

8. The welding device for the inner reinforcement beam of the skin according to claim 7, characterized in that: The headstock is also provided with a turning machine, the output end of which is connected to the positioning mandrel, and the tailstock comprises a mandrel centering frame, which is rollingly fitted with the end of the positioning mandrel.

9. A method for welding a skin inner reinforcement beam, using the welding device for a skin inner reinforcement beam according to any one of claims 1 to 8, characterized in that: The welding method includes: Placing the reinforcing beam in the positioning slot; Sleeve the skin on the outer periphery of the positioning mandrel; The pull rod is pulled out from the positioning mandrel, the centering clamp clamps and limits the reinforcing beam, the lifting block drives the reinforcing beam to lift outward, and the reinforcing beam spreads the skin; After the reinforcing beam and the skin reach a set size, welding the skin area where the reinforcing beam is provided; After welding one of the reinforcing beams, the skin is driven to rotate by the head seat and the tail seat to continue welding the next area where the reinforcing beam is arranged; After all the reinforcing beams are welded, the pull rod is returned to the positioning mandrel, and the skin welded with the reinforcing beams is removed from the positioning mandrel.

10. The method for welding the inner reinforcement beam of the skin according to claim 9, characterized in that: The skin area provided with the reinforcing beam is welded by using equipment equipped with laser penetration welding connection technology.

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