Stainless steel vacuum cylinder welding equipment and welding method

Abstract

The invention discloses stainless steel vacuum barrel welding equipment and a welding method, and relates to the technical field of welding equipment.The stainless steel vacuum barrel welding equipment comprises a main body, a sealing door is slidably connected to one end of the main body, a limiting mechanism is arranged in the main body, two sets of electric push rods are arranged in the limiting mechanism, and fixing plates are fixed to the two sides of the top end of the limiting mechanism; two sets of metal plates are arranged at one end of the sealing door, the metal plates and the sealing door are elastically connected through a plurality of sets of springs, and a first U-shaped block is fixed to one end of each metal plate. A linear motor is started through a control panel to drive a limiting mechanism to move outwards, a linkage clamping mechanism and a rotary telescopic mechanism are synchronously expanded outwards, electron beam welding is started after an external vacuum pump establishes a vacuum environment, the equipment adopts inner and outer double-side force application to ensure uniform clamping, a shape memory alloy compensates a high-temperature sealing gap, and a spring realizes automatic reset; and sealing failure caused by deformation and thermal deformation of the thin-wall cylinder is effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment. Specifically, it is a stainless steel vacuum cylinder welding equipment and welding method. Background Art

[0002] The main function of stainless steel welding is to melt and connect stainless steel components through melting to ensure structural strength and airtightness, while maintaining the corrosion resistance of the material. This process can efficiently process various stainless steel products, such as pipes, containers, and mechanical equipment. By precisely controlling the heat input and welding parameters, deformation and oxidation can be reduced, and the mechanical properties of the weld area can be maintained consistent with the base material. The welded stainless steel components are widely used in industries such as chemical, food, medical, and energy, meeting strict requirements such as high temperature resistance, pressure resistance, and hygiene standards. It is a key technology for realizing reliable connection of stainless steel materials in industrial manufacturing.

[0003] The electron beam welding equipment for stainless steel vacuum cylinders is an advanced equipment that uses high-energy electron beams to precisely weld stainless steel cylinders in a vacuum environment. Its working principle is to emit a high-speed electron beam through an electron gun, focus it on the surface of the workpiece in a vacuum environment, instantly generate high temperature to melt the metal and form high-quality welds. This equipment has significant characteristics such as high energy density, strong penetration, small heat-affected zone, and small welding deformation. It can achieve single-pass deep penetration welding of thick stainless steel plates, and the weld depth-to-width ratio can reach more than twenty to one. Under vacuum protection, oxidation, nitridation, and other contaminations can be completely avoided, ensuring the purity and density of the welds. At the same time, it is equipped with an accurate numerical control system, which can realize automated welding of complex trajectories.

[0004] The existing electron beam welding equipment for stainless steel vacuum cylinders generally has the following technical defects: During the welding process, the traditional fixture system uses a single-direction force application method, resulting in uneven clamping force distribution, which easily causes plastic deformation of thin-walled stainless steel cylinders, seriously affecting welding accuracy and finished product quality. Secondly, the existing clamping mechanism lacks an adaptive adjustment function and cannot automatically adjust the clamping force according to the different diameters and lengths of the cylinders, resulting in problems such as loose clamping of large-size workpieces and excessive force on small-size workpieces. More critically, after the equipment sealing door is closed, it only relies on the initial pressure to maintain the vacuum degree and lacks a secondary locking mechanism, which is prone to sealing failure due to thermal deformation during long-term high-temperature welding. These problems directly lead to an increase in the porosity of the welds and an increase in the roundness deviation of the cylinders, seriously restricting the manufacturing qualification rate of aerospace-grade stainless steel containers. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a stainless steel vacuum cylinder welding equipment and welding method to solve the technical problems that single-direction clamping easily causes cylinder deformation, the lack of adaptive adjustment results in uneven forces on workpieces of different sizes; the sealing door lacks a secondary locking mechanism and is prone to leakage at high temperatures.

[0006] To achieve the above object, the present invention provides the following technical solutions: A stainless steel vacuum cylinder welding device and welding method, including a main body, one end of the main body is slidably connected with a sealing door, a limiting mechanism is arranged inside the main body, two groups of electric push rods are arranged inside the limiting mechanism, fixing plates are fixed on both sides of the top end of the limiting mechanism, a clamping mechanism is arranged at one end of the fixing plate, a rotating and telescopic structure is arranged at one end of the clamping mechanism, a transmission rod matching with the clamping mechanism and the rotating and telescopic structure is arranged inside the fixing plate, a first gear is fixed on the outer side of the transmission rod, a second gear is engaged with the bottom end of the first gear, two groups of metal plates are arranged at one end of the sealing door, the metal plates and the sealing door are elastically connected by a plurality of springs, and a first U-shaped block is fixed at one end of the metal plate.

[0007] By adopting the above technical solutions, the staff places the main body in a suitable position, and then fixes it through a plurality of support legs at the bottom end of the main body. At this time, the external staff electrically controls the linear motor located inside the main body to start through the control panel, so that the linear motor drives the limiting mechanism at its top to move outward. When the limiting mechanism moves, it will drive the clamping mechanism and the rotating and telescopic mechanism arranged at its top to move outward synchronously. When the movement is completed, the staff manually places the stainless steel cylinder to be vacuum welded into the clamping mechanisms on both sides and outside the rotating and telescopic mechanism at one time.

[0008] Further, the limiting mechanism includes a linear motor, a load-bearing member, a rotating rod, a sliding plate and a long gear. The linear motor is arranged inside the main body, the load-bearing member is arranged at the top end of the linear motor, the rotating rod is rotatably connected inside the load-bearing member, the sliding plate is fixed at one end of the fixing plate, the long gear is arranged on the outer side of the rotating rod, a chute matching with the sliding plate is opened inside the load-bearing member, and a cavity matching with the electric push rod is opened inside the load-bearing member.

[0009] By adopting the above technical solutions, the linear motor is moved back through the control panel, so as to drive the processed stainless steel cylinder to also move into the main body. When the movement is completed, the double-shaft motor arranged inside the limiting mechanism is started through the control panel, so as to drive the rotating rod fixed at its output end through the transmission of the double-shaft motor. When the rotating rod rotates, it will drive the second gear and the long gear arranged at one end of it to drive synchronously.

[0010] Further, the clamping mechanism includes a toothed plate, a fixed block, a clamping block and a third gear. The toothed plate is arranged at one end of the first gear, the fixed block is fixed at one end of the first gear, the clamping block is arranged at one end of the toothed plate, the third gear is rotatably connected at one end of the first gear, a chute matching with the fixed block is opened inside the toothed plate, and the clamping block and the toothed plate are connected by a damping shaft.

[0011] By adopting the above technical solution, multiple groups of tooth plates on the outer side thereof move inward, and the clamping blocks provided at one end of the tooth plates are in clamping contact with the outer side of the stainless steel cylinder. When the transmission rod rotates, it will also drive the connecting frame to rotate to a certain extent, so that the sliding rod slidably connected inside the connecting frame will, due to the rotation of the connecting frame, cause the rotating rod to eject outward under the action of the rotation groove opened inside the fixed frame, so as to limit and support the inner side of the stainless steel cylinder, thus ensuring that when the inner side and the outer side of the stainless steel cylinder are simultaneously squeezed and clamped, deformation of the stainless steel cylinder caused by excessive extrusion pressure on one side is prevented.

[0012] Further, the rotation and telescopic structure includes a sliding rod, a connecting frame and a fixed frame. The sliding rod is slidably connected inside the connecting frame. The connecting frame is fixedly connected to one end of the transmission rod. The fixed frame is fixedly connected to the fixed plate. The fixed frame and the fixed plate are fixed by bolts. A chute matching the sliding rod is opened inside the connecting frame.

[0013] By adopting the above technical solution, after clamping, external staff electrically control two electric push rods arranged inside the limiting mechanism through the control panel. When the two electric push rods are started, they will drive the second U-shaped blocks and the baffle plates provided at one end thereof to push into the main body, thereby driving the clamping mechanism and the rotation and telescopic structure near one end of the sealing door to slide into the main body through the sliding plates fixed on the outside, so as to drive the stainless steel cylinder to be vacuum welded to fit, reaching a suitable welding point. Then, an external vacuum pump is operated to make the inside of the main body reach a vacuum environment, and then the electron beam device is controlled through the control panel for vacuum welding.

[0014] Further, support legs are provided at the four corners of the bottom end of the main body. A control panel is provided on one side of the main body. Two sliders are fixed at one end of the sealing door. A cavity matching the sealing door is opened inside the main body.

[0015] By adopting the above technical solution, a spring is arranged inside the cavity of the limiting mechanism that is opened to match the sliding plate, so as to ensure that when the electric push rod is not operating, the clamping mechanism near one end of the sealing door can be reset. Moreover, a shape memory alloy is also arranged inside the sliders provided at one end of the sealing door to expand and compensate the sealing gap at high temperature.

[0016] Further, a welding method for a stainless steel vacuum cylinder welding device includes the following steps:

[0017] S1. Fix the main body through the supporting legs, start the linear motor through the control panel to drive the limit mechanism to move outward, synchronously drive the clamping mechanism and the rotating telescopic structure to expand outward, put the cylinder to be welded in, and then the linear motor retracts to bring the cylinder into the main body;

[0018] S2, start the dual-axis motor to drive the rotating rod, through the second gear and the long gear, so that the first gear drives the transmission rod to rotate, and drives the third gear to drive the gear plate to move;

[0019] S3, the tooth plate drives the clamping block to clamp the outer wall of the cylinder, and at the same time the transmission rod drives the connecting frame to rotate, so that the sliding rod extends outward along the rotating groove of the fixed frame to support the inner wall of the cylinder;

[0020] S4. Start the electric push rod to push the second U-shaped block and the baffle, so that the clamping mechanism and the rotating and telescopic structure slide along the sliding plate, position the cylinder to the welding position, start the vacuum pump to evacuate, and complete the welding operation through the electron beam equipment.

[0021] To sum up, the present invention mainly has the following beneficial effects: the present invention starts the linear motor through the control panel to drive the limit mechanism to move outward, and the linkage clamping mechanism and the rotating and telescopic mechanism expand outward synchronously. After the cylinder to be welded is manually placed, the linear motor retracts to bring the cylinder into the main body, and the dual-axis motor drives the rotating rod. The first gear drives the transmission rod to rotate through the gear set transmission, and the third gear drives the toothed plate to move, so that the clamping block contacts the outer wall of the cylinder. At the same time, the connecting frame rotates to push the sliding rod to extend along the rotating groove of the fixed frame to support the inner wall of the cylinder, thereby realizing synchronous clamping inside and outside. The electric push rod is started to push the U-shaped block and the baffle, driving the clamping mechanism to move axially through the sliding plate to accurately align the cylinder, and the electron beam welding is started after the external vacuum pump establishes a vacuum environment. The equipment adopts internal and external double-sided force to ensure uniform clamping, shape memory alloy compensates for the high-temperature sealing gap, and the spring realizes automatic reset, which effectively prevents the sealing failure caused by deformation of the thin-walled cylinder and thermal deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention from a first viewing angle;

[0023] Figure 2 It is a schematic diagram of the overall structure of the present invention from a second viewing angle;

[0024] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0025] Figure 4 It is a partial structural schematic diagram of the present invention;

[0026] Figure 5 For the present invention Figure 4 A magnified image

[0027] Figure 6Schematic diagram of the local structure of the present invention;

[0028] Figure 7 Schematic diagram of the limiting mechanism structure of the present invention;

[0029] Figure 8 For the present invention Figure 7 Enlarged view at position B;

[0030] Figure 9 Schematic diagram of the clamping mechanism structure of the present invention;

[0031] Figure 10 Schematic diagram of the rotating and telescoping structure of the present invention;

[0032] Figure 11 For the present invention Figure 9 Enlarged view at position C.

[0033] In the figure: 1, main body; 2, sealing door; 3, control panel; 4, support leg; 5, electron beam device; 6, clamping mechanism; 601, toothed plate; 602, fixed block; 603, clamping block; 604, third gear; 7, rotating and telescoping structure; 701, sliding rod; 702, connecting frame; 703, fixed frame; 8, first gear; 9, limiting mechanism; 901, linear motor; 902, load-bearing member; 903, rotating rod; 904, sliding plate; 905, long gear; 10, second gear; 11, metal plate; 12, spring; 13, first U-shaped block; 14, second U-shaped block; 15, baffle; 16, electric push rod; 17, fixing plate; 18, transmission rod. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0035] Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0036] A stainless steel vacuum cylinder welding device and welding method, as Figures 1-11As shown in the figure, it includes a main body 1. One end of the main body 1 is slidably connected with a sealing door 2. A limiting mechanism 9 is arranged inside the main body 1. Two groups of electric push rods 16 are arranged inside the limiting mechanism 9. Fixed plates 17 are fixed on both sides of the top of the limiting mechanism 9. A clamping mechanism 6 is arranged at one end of the fixed plate 17. A rotary telescopic structure 7 is arranged at one end of the clamping mechanism 6. A transmission rod 18 that cooperates with the clamping mechanism 6 and the rotary telescopic structure 7 is arranged inside the fixed plate 17. A first gear 8 is fixed on the outer side of the transmission rod 18. A second gear 10 is engaged with the bottom end of the first gear 8. Two groups of metal plates 11 are arranged at one end of the sealing door 2. The metal plates 11 and the sealing door 2 are elastically connected by a plurality of springs 12. A first U-shaped block 13 is fixed at one end of the metal plate 11. Among them, when the limiting mechanism 9 moves, it will drive the clamping mechanism 6 and the rotary telescopic mechanism 7 arranged at its top to move outward synchronously. When the movement is completed, the staff manually places the stainless steel cylinder to be vacuum welded into the clamping mechanisms 6 on both sides in sequence, outside the rotary telescopic mechanism 7;

[0037] Exemplarily, the limiting mechanism 9 includes a linear motor 901, a load-bearing member 902, a rotating rod 903, a sliding plate 904, and a long gear 905. The linear motor 901 is arranged inside the main body 1. The load-bearing member 902 is arranged on the top of the linear motor 901. The rotating rod 903 is rotatably connected inside the load-bearing member 902. The sliding plate 904 is fixed at one end of the fixed plate 17. The long gear 905 is arranged on the outer side of the rotating rod 903. A chute that cooperates with the sliding plate 904 is opened inside the load-bearing member 902. A cavity that cooperates with the electric push rod 16 is opened inside the load-bearing member 902. Among them, then when the staff operates the linear motor 901 through the control panel 3 again to move back, it will drive the processed stainless steel cylinder to also move into the main body 1. When the movement is completed, the biaxial motor arranged inside the limiting mechanism 9 is started through the control panel 3, so as to drive the rotating rod 903 fixed to its output end through the transmission of the biaxial motor. When the rotating rod 903 rotates, it will drive the second gear 10 and the long gear 905 arranged at one end of it to drive synchronously;

[0038] Exemplarily, the clamping mechanism 6 includes a toothed plate 601, a fixed block 602, a clamping block 603, and a third gear 604. The toothed plate 601 is disposed at one end of the first gear 8, the fixed block 602 is fixed at one end of the first gear 8, the clamping block 603 is disposed at one end of the toothed plate 601, and the third gear 604 is rotatably connected to one end of the first gear 8. A chute matching the fixed block 602 is formed inside the toothed plate 601. The clamping block 603 is connected to the toothed plate 601 through a damping shaft. Therein, a plurality of groups of toothed plates 601 on the outer side thereof are moved inward, and the clamping block 603 disposed at one end of the toothed plate 601 clamps and contacts the outer side of the stainless steel cylinder. When the transmission rod 18 rotates, it will also drive the connecting frame 702 to rotate to a certain extent, so that the sliding rod 701 slidably connected inside the connecting frame 702 will, due to the rotation of the connecting frame 702, make the rotating rod 701 eject outward along the rotation groove formed inside the fixed frame 703, so as to limit and support the inner side of the stainless steel cylinder, so as to ensure that when the inner side and the outer side of the stainless steel cylinder are simultaneously squeezed and clamped, the deformation of the stainless steel cylinder caused by excessive extrusion pressure on one side is prevented;

[0039] Exemplarily, the rotary telescopic structure 7 includes a sliding rod 701, a connecting frame 702, and a fixed frame 703. The sliding rod 701 is slidably connected inside the connecting frame 702. The connecting frame 702 is fixedly connected to one end of the transmission rod 18. The fixed frame 703 is fixedly connected to the fixed plate 17. The fixed frame 703 and the fixed plate 17 are fixed by bolts. A chute matching the sliding rod 701 is formed inside the connecting frame 702. Therein, after clamping, an external worker electrically controls two electric push rods 16 disposed inside the limiting mechanism 9 through the control panel 3. When the two electric push rods 16 are started, they will drive the second U-shaped block 14 and the baffle 15 disposed at one end thereof to push into the main body 1, so as to drive the clamping mechanism 6 and the rotary telescopic structure 7 near one end of the sealing door 2 to slide into the main body 1 through the sliding plate 904 fixed on the outside, so as to drive the stainless steel cylinder to be vacuum welded to fit, reaching a suitable welding point. Then, an external vacuum pump is operated, so that the inside of the main body 1 reaches a vacuum environment, and then the electron beam device 5 is controlled through the control panel 3 to perform vacuum welding;

[0040] Exemplarily, support legs 4 are provided at the four corners of the bottom end of the main body 1. A control panel 3 is provided on one side of the main body 1. Two groups of sliders are fixed at one end of the sealing door 2. A cavity matching the sealing door 2 is opened inside the main body 1. Among them, the first gear 8 meshed with it is also driven to rotate synchronously. When the first gear 8 rotates, the transmission rod 18 provided at one end thereof will drive the third gear 604 to rotate. When the third gear 604 rotates, it will drive the toothed plate 601 meshed with it on the outside to move.

[0041] The working principle of the present invention is as follows: During use, the staff places the main body 1 in a suitable position, and then fixes it through multiple support legs 4 at the bottom end of the main body 1. At this time, the external staff electrically controls the linear motor 901 located inside the main body 1 to start through the control panel 3, so that the linear motor 901 drives the limiting mechanism 9 at its top to move outward;

[0042] When the limiting mechanism 9 moves, it will drive the clamping mechanism 6 and the rotary telescopic mechanism 7 provided at its top to move outward synchronously. When the movement is completed, the staff manually places the stainless steel cylinder to be vacuum welded into the clamping mechanisms 6 on both sides in sequence, outside the rotary telescopic mechanism 7;

[0043] Then the staff moves the linear motor 901 back through the control panel 3 again, so as to drive the processed stainless steel cylinder to also move into the main body 1. When the movement is completed, the biaxial motor provided inside the limiting mechanism 9 is started through the control panel 3. Thus, through the transmission of the biaxial motor, the output end thereof is driven, and the rotating rod 903 fixed thereto. When the rotating rod 903 rotates, it will drive the second gear 10 and the long gear 905 provided at one end thereof to perform synchronous transmission;

[0044] Thereby driving the first gear 8 meshed with it to also rotate synchronously. When the first gear 8 rotates, the transmission rod 18 provided at one end thereof will drive the third gear 604 to rotate. When the third gear 604 rotates, it will drive the toothed plate 601 meshed with it on the outside to move;

[0045] Thus, multiple groups of toothed plates 601 on its outer side move inward, and the clamping blocks 603 provided at one end of the toothed plates 601 clamp and contact the outer side of the stainless steel cylinder. When the transmission rod 18 rotates, it will also drive the connecting frame 702 to rotate to a certain extent. As a result, the sliding rod 701 slidably connected inside the connecting frame 702 will be pushed outward along the rotation groove opened inside the fixed frame 703 due to the rotation of the connecting frame 702, so as to limit and support the inner side of the stainless steel cylinder. Thus, when the inner and outer sides of the stainless steel cylinder are simultaneously squeezed and clamped, it is ensured that the stainless steel cylinder will not be deformed due to excessive extrusion pressure on one side;

[0046] After clamping, an external operator electrically controls two electric push rods 16 provided inside the limiting mechanism 9 through the control panel 3. When the two electric push rods 16 are started, they will drive the second U-shaped blocks 14 and the baffles 15 provided at one end thereof to push into the main body 1, thereby driving the clamping mechanism 6 and the rotary telescopic structure 7 near one end of the sealing door 2 to slide into the main body 1 through the sliding plates 904 fixed on the outside, so as to drive the stainless steel cylinder to be vacuum welded to fit, reach the appropriate welding position, and then operate through an external vacuum pump, so that the inside of the main body 1 reaches a vacuum environment, and then control the electron beam device 5 to perform vacuum welding through the control panel 3;

[0047] Specifically, a cavity matching the sliding plate 904 is opened in the middle of the limiting mechanism 9, and a spring 12 is arranged inside, so as to ensure that when the electric push rod 16 is not operating, the clamping mechanism near one end of the sealing door 2 can be reset, and a shape memory alloy is also arranged inside the slider provided at one end of the sealing door 2 to expand and compensate the sealing gap at high temperature;

[0048] Through the above structure, during the welding process, the force application method of applying force from both the inside and outside is adopted to ensure that the clamping force is evenly distributed and the thin-walled stainless steel cylinder will not undergo plastic deformation. Then, the clamping force can be automatically adjusted according to the different diameters and lengths of the cylinder, and a secondary locking mechanism is also provided to prevent the sealing failure caused by thermal deformation during the long-term high-temperature welding process.

[0049] Although embodiments of the present invention have been shown and described, the specific embodiments are merely explanations of the present invention and not limitations thereof. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations that do not contribute creatively to the embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A stainless steel vacuum cylinder welding device, comprising a main body (1), characterized in that: One end of the main body (1) is slidably connected with a sealing door (2). A limiting mechanism (9) is arranged inside the main body (1). Two electric push rods (16) are arranged inside the limiting mechanism (9). Fixed plates (17) are fixed on both sides of the top end of the limiting mechanism (9). A clamping mechanism (6) is arranged at one end of the fixed plate (17). A rotary telescopic structure (7) is arranged at one end of the clamping mechanism (6). A transmission rod (18) which is matched with the clamping mechanism (6) and the rotary telescopic structure (7) is arranged inside the fixed plate (17). A first gear (8) is fixed on the outer side of the transmission rod (18). A second gear (10) is meshed with the bottom end of the first gear (8). Two metal plates (11) are arranged at one end of the sealing door (2). The metal plates (11) and the sealing door (2) are elastically connected by a plurality of springs (12). A first U-shaped block (13) is fixed at one end of the metal plate (11).

2. The stainless steel vacuum cylinder welding equipment according to claim 1, characterized in that: The limiting mechanism (9) includes a linear motor (901), a load-bearing member (902), a rotating rod (903), a sliding plate (904) and a long gear (905). The linear motor (901) is arranged inside the main body (1). The load-bearing member (902) is arranged on the top end of the linear motor (901). The rotating rod (903) is rotatably connected inside the load-bearing member (902). The sliding plate (904) is fixed at one end of the fixed plate (17). The long gear (905) is arranged on the outer side of the rotating rod (903).

3. A stainless steel vacuum cylinder welding device according to claim 2, characterized in that: A chute which is matched with the sliding plate (904) is opened inside the load-bearing member (902). A cavity which is matched with the electric push rod (16) is opened inside the load-bearing member (902).

4. A stainless steel vacuum cylinder welding device according to claim 1, characterized in that: The clamping mechanism (6) includes a toothed plate (601), a fixed block (602), a clamping block (603) and a third gear (604). The toothed plate (601) is arranged at one end of the first gear (8). The fixed block (602) is fixed at one end of the first gear (8). The clamping block (603) is arranged at one end of the toothed plate (601). The third gear (604) is rotatably connected at one end of the first gear (8).

5. A stainless steel vacuum cylinder welding device according to claim 4, characterized in that: A chute which is matched with the fixed block (602) is opened inside the toothed plate (601). The clamping block (603) and the toothed plate (601) are connected by a damping shaft.

6. The stainless steel vacuum cylinder welding equipment according to claim 1, characterized in that: The rotary telescopic structure (7) includes a sliding rod (701), a connecting frame (702) and a fixed frame (703). The sliding rod (701) is slidably connected inside the connecting frame (702). The connecting frame (702) is fixedly connected to one end of the transmission rod (18). The fixed frame (703) is fixedly connected to the fixed plate (17).

7. The stainless steel vacuum cylinder welding equipment according to claim 6, characterized in that: The fixed frame (703) and the fixed plate (17) are fixed by a limiting frame. A chute which is matched with the sliding rod (701) is opened inside the connecting frame (702).

8. A stainless steel vacuum cylinder welding device according to claim 1, characterized in that: The output end of the electric push rod (16) is fixedly connected with a baffle (15). A second U-shaped block (14) is arranged at one end of the baffle (15).

9. A stainless steel vacuum cylinder welding device according to claim 1, characterized in that: Two groups of sliders are fixed at one end of the sealing door (2), and a cavity matching the sealing door (2) is formed inside the main body (1).

10. The welding method of a stainless steel vacuum cylinder welding device according to claim 1, characterized in that, The method includes the following steps: S1. (1) Fix the main body (1) through the support legs (4). Start the linear motor (901) through the control panel (3) to drive the limiting mechanism (9) to move outward, synchronously drive the clamping mechanism (6) and the rotary telescopic structure (7) to expand outward. After placing the cylinder to be welded, the linear motor (901) retracts to bring the cylinder into the main body (1). S2. (2) Start the biaxial motor to drive the rotating rod (903). Through the transmission of the second gear (10) and the long gear (905), the first gear (8) drives the transmission rod (18) to rotate, and drives the third gear (604) to drive the toothed plate (601) to move. S3. (3) The toothed plate (601) drives the clamping block (603) to clamp the outer wall of the cylinder. At the same time, the transmission rod (18) drives the connecting frame (702) to rotate, so that the sliding rod (701) extends out along the rotating groove of the fixed frame (703) to support the inner wall of the cylinder. S4. (4) Start the electric push rod (16) to push the second U-shaped block (14) and the baffle (15), so that the clamping mechanism (6) and the rotary telescopic structure (7) slide along the sliding plate (904), position the cylinder to the welding position, start the vacuum pump to pump vacuum, and complete the welding operation through the electron beam device (5).

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