Annular welding device for pressure vessel barrel

Abstract

The invention relates to the technical field of welding equipment, and discloses an annular welding device for a pressure vessel barrel, which comprises a base, a first clamping device is arranged at one end of the base, a second clamping device is arranged at the other end of the base, and the first clamping device is connected with the base through a hydraulic turnover table. When the hydraulic overturning table adjusts the first clamping device to be in the horizontal state, the first clamping device corresponds to the second clamping device at the moment, and the first clamping device and the second clamping device jointly clamp a to-be-welded pressure container barrel which is horizontally and transversely arranged, and when the hydraulic overturning table adjusts the first clamping device to be in the vertical state, the first clamping device and the second clamping device are clamped together. At the moment, the first clamping device clamps the vertically-arranged to-be-welded pressure container barrel, and the second clamping devices are connected through a sliding device. Through cooperation of the annular welding mechanism and the dip angle adjusting device, annular welding can be conducted on a fixed flange at any angle on the pressure container, then the defects of existing welding equipment are overcome, and the applicability of the welding equipment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, in particular to an annular welding device for a pressure vessel cylinder. Background Art

[0002] As a critical equipment in the industrial field, pressure vessels are widely used in many industries such as petrochemical, energy and electricity, and aerospace. They are mainly used to store and transport various pressurized gas or liquid media. In the manufacturing process of pressure vessels, the welding of the cylinder is a core process, and its welding quality is directly related to the overall safety, reliability and service life of the pressure vessel.

[0003] Most existing pressure vessel welding equipment clamps the pressure vessel horizontally or vertically, aligns the welding equipment with the welding point, and drives the pressure vessel to rotate for circular welding. This welding is based on rotation around the axis of the pressure vessel. However, this method is difficult to achieve for welding fixed flanges on pressure vessels because the axes of some fixed flanges deviate from the axis of the pressure vessel, which means that circular welding cannot be achieved by rotating the pressure vessel. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides an annular welding device for a pressure vessel cylinder, which solves the problem that the existing pressure vessel welding equipment is inconvenient to weld and fix flanges.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an annular welding device for a pressure vessel cylinder, comprising a base, a clamping device 1 is arranged at one end of the base, and a clamping device 2 is arranged at the other end, the clamping device 1 and the base are connected through a hydraulic flip table, when the hydraulic flip table adjusts the clamping device 1 to a horizontal state, the clamping device 1 corresponds to the clamping device 2, and together clamps the horizontally placed pressure vessel cylinder to be welded, when the hydraulic flip table adjusts the clamping device 1 to a vertical state, the clamping device 1 and the clamping device 2 clamp the vertically placed pressure vessel cylinder to be welded, and the clamping devices 2 are connected by sliding The device is connected, the sliding device is used to adjust the distance between the clamping device 2 and the clamping device 1, auxiliary clamping devices are respectively arranged on both sides of the clamping device 1, and the auxiliary clamping devices are slidably connected to the base, and are used to provide auxiliary support for the cylinder of the pressure vessel to be welded, an annular welding mechanism is arranged above the base, the welding part of the annular welding mechanism rotates around the outer side of the cylinder of the pressure vessel to be welded and performs welding, the two ends of the annular welding mechanism are respectively connected to the linear displacement device through pillars, and an inclination adjustment device is also arranged between the annular welding mechanism and the pillars, which is used to adjust the relative inclination angle between the annular welding mechanism and the cylinder of the pressure vessel to be welded.

[0006] Preferably, the clamping device comprises a clamping platform, one side of which is fixedly connected to the flipping end of the hydraulic flipping platform, and the other side is provided with an internal expansion clamp, which extends into the cylinder of the pressure vessel to be welded and performs internal expansion clamping and fixing.

[0007] Preferably, the second clamping device comprises a second clamping platform, and a second internal expansion clamp is arranged on the side of the second clamping platform opposite to the first clamping platform. The second internal expansion clamp extends into the cylinder of the pressure vessel to be welded and performs internal expansion clamping and fixing.

[0008] Preferably, the sliding device includes a slide groove, which is opened in the upper inner part of the base, a screw rod is rotatably connected in the slide groove, one end of the screw rod passes through the groove wall of the slide groove and is fixedly connected to the output end of motor one, the outer wall of motor one is fixedly connected to the outer wall of the base, a sliding base is slidably connected in the slide groove, the bottom of the sliding base is sleeved and threadedly connected to the threaded part of the screw rod, and the upper surface of the sliding base is fixedly connected to the bottom wall of the clamping table two.

[0009] Preferably, the auxiliary clamping device includes a plurality of sliding bars and V-shaped baffle bars, and the plurality of sliding bars are symmetrically distributed on the front and rear sides of the base, and a lifting rod is sleeved and slidably connected to the outer wall of the sliding bar on the same side, and a locking buckle is also provided between the lifting rod and the sliding bar, which is used to lock and fix the lifting rod to the sliding bar, and a horizontal slot and a vertical slot are successively provided on the upper part of the lifting rod toward the side of the base, and the bent portion of the V-shaped baffle bar is fixedly connected to the output end of the electric push rod, and a bayonet is provided on the end face of the outer cylinder of the electric push rod, and when the bayonet is engaged in the horizontal slot, the V-shaped baffle bar is used to auxiliary support the pressure vessel cylinder to be welded in a vertical state, and when the bayonet is engaged in the vertical slot, the V-shaped baffle bar is used to auxiliary support the pressure vessel cylinder to be welded in a horizontal state.

[0010] Preferably, the annular welding mechanism includes an outer ring body, the outer side wall of the outer ring body is fixedly connected to two symmetrically arranged rotating shafts, the outer ends of the two rotating shafts are respectively rotatably connected to the upper parts of the corresponding two pillars, the inner ring body is embedded in and rotatably connected, one side of the inner ring body is fixedly connected to a gear ring, and the other side is provided with a welding device, the tooth end of the gear ring is meshingly connected to a bevel gear, the center of the bevel gear is fixedly connected to the second output end of the motor, and the outer wall of the second motor is fixedly connected to the side wall of the outer ring body.

[0011] Preferably, the inclination adjustment device is arranged between the rotating shaft and the support, and includes an angle monitoring unit, a control unit and an execution unit, wherein the angle monitoring unit is used to monitor the current inclination angle of the annular welding mechanism, and the control unit is used to receive a control command and control the execution unit to drive the rotating shaft to rotate a corresponding angle.

[0012] Preferably, the welding equipment is installed on the moving end of the linear electric slide rail, the outer wall of the linear electric slide rail is fixedly connected to the side wall of the inner ring body, and the welding equipment is driven by the linear electric slide rail to move linearly between the center of the inner ring body and the ring wall.

[0013] Preferably, an electric aperture structure is provided between the welding equipment and the inner ring body, and the welding equipment is installed on one of the blades of the electric aperture structure. The outer wall of the electric aperture structure is fixedly connected to the side wall of the inner ring body. The welding equipment is driven by the electric aperture structure to move between the center of the inner ring body and the ring wall, and the welding equipment is always facing the center of the inner ring body.

[0014] Preferably, the blades of the two electric aperture structures adjacent to the welding equipment are also provided with a preheating unit and a slow cooling unit, which are used for preheating the welding point before welding and slow cooling after welding, respectively.

[0015] The present invention provides a ring welding device for a pressure vessel cylinder, which has the following beneficial effects:

[0016] The present invention can perform annular welding on the pressure vessel in a vertical state or in a horizontal state by cooperating with the clamping device 1, the clamping device 2, the auxiliary clamping device and the annular welding mechanism, thereby meeting the requirements of various welding processes. The annular welding mechanism and the inclination adjustment device are used to perform annular welding on the fixed flange of the pressure vessel at any angle, thereby solving the defects of the existing welding equipment and improving the applicability of the welding equipment. At the same time, the electric aperture structure or the linear electric slide rail installed on the annular welding mechanism can realize the welding of pressure vessels of different sizes, further improving the versatility of the welding equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front perspective view of a ring-shaped welding device for a pressure vessel cylinder according to the present invention;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0020] Figure 4 A rear perspective view of an annular welding device for a pressure vessel cylinder according to the present invention;

[0021] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0022] Figure 6It is a structural schematic diagram of the sliding device in the present invention;

[0023] Figure 7 It is another structural schematic diagram of the annular welding mechanism in the present invention.

[0024] Among them, 1. base; 101. slide; 2. clamping device 1; 201. clamping table 1; 202. internal expansion clamp 1; 3. clamping device 2; 301. clamping table 2; 302. internal expansion clamp 2; 4. hydraulic turning table; 5. auxiliary clamping device; 501. slide bar; 502. V-shaped baffle; 503. lifting rod; 504. electric push rod; 6. annular welding mechanism; 601. outer ring body; 602. rotating shaft; 603. inner ring body; 604. gear ring; 605. welding equipment; 606. bevel gear; 607. motor 2; 608. linear electric slide rail; 609. electric aperture structure; 7. pillar; 8. linear displacement device; 9. screw; 10. motor 1; 11. sliding base. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Please see attached Figure 1 -Attached Figure 6The embodiment of the present invention provides an annular welding device for a pressure vessel cylinder, comprising a base 1, a clamping device 2 is arranged at one end of the base 1, and a clamping device 2 3 is arranged at the other end. The clamping device 2 is connected to the base 1 through a hydraulic flip table 4. When the hydraulic flip table 4 adjusts the clamping device 2 to a horizontal state, the clamping device 2 corresponds to the clamping device 2 3 and clamps the horizontally placed pressure vessel cylinder to be welded together. When the hydraulic flip table 4 adjusts the clamping device 2 to a vertical state, the clamping device 2 clamps the vertically placed pressure vessel cylinder to be welded. The clamping devices 2 and 3 are connected by a sliding device. The movable device is used to adjust the distance between the clamping device 2 3 and the clamping device 1 2. Auxiliary clamping devices 5 are respectively arranged on both sides of the clamping device 2, and the auxiliary clamping devices 5 are slidably connected to the base 1, and are used to provide auxiliary support for the cylinder of the pressure vessel to be welded. An annular welding mechanism 6 is arranged above the base 1. The welding part of the annular welding mechanism 6 rotates around the outer side of the cylinder of the pressure vessel to be welded and welds. The two ends of the annular welding mechanism 6 are respectively connected to the linear displacement device 8 through the support 7, and an inclination adjustment device is also arranged between the annular welding mechanism 6 and the support 7, which is used to adjust the relative inclination angle between the annular welding mechanism 6 and the cylinder of the pressure vessel to be welded.

[0027] By setting the hydraulic turning table 4, when the hydraulic turning table 4 adjusts the clamping device 1 2 to a horizontal state, the clamping device 1 2 corresponds to the clamping device 2 3, and together clamps the horizontally placed pressure vessel cylinder to be welded. When the hydraulic turning table 4 adjusts the clamping device 1 2 to a vertical state, the clamping device 1 2 clamps the vertically placed pressure vessel cylinder to be welded, so that the pressure vessel can be annularly welded in a vertical state or in a horizontal state, thereby meeting the needs of various welding processes. At the same time, the annular welding mechanism 6 can not only be set on the outside of the pressure vessel to achieve horizontal or vertical welding, but also can adapt to the welding angle of the fixed flange under the cooperation of the inclination adjustment device, and perform annular welding on the fixed flange set outside. By using the cooperation of the annular welding mechanism and the inclination adjustment device, the fixed flange at any angle on the pressure vessel can be annularly welded, thereby solving the defects of the existing welding equipment and improving the applicability of the welding equipment.

[0028] The clamping device 2 includes a clamping platform 201, one side of which is fixedly connected to the turning end of the hydraulic turning platform 4, and the other side is provided with an internal expansion clamp 202, which extends into the cylinder of the pressure vessel to be welded and clamps it internally. The clamping device 23 includes a clamping platform 2 301, and the side of the clamping platform 2 301 opposite to the clamping platform 201 is provided with an internal expansion clamp 2 302, which extends into the cylinder of the pressure vessel to be welded and clamps it internally.

[0029] By cooperating with the clamping device 1 2 and the clamping device 2 3, the internal expansion clamping and fixing of the openings at both ends of the horizontal pressure vessel cylinder is realized. When the pressure vessel cylinder needs to be welded in a vertical state, it is only necessary to use the hydraulic turning table 4 to turn the clamping device 1 2 over, and the clamping device 2 can perform the internal expansion clamping of the lower opening of the vertical pressure vessel cylinder, and then cooperate with the auxiliary clamping device 5 to achieve the clamping and fixing of the vertical pressure vessel cylinder.

[0030] The sliding device includes a slide groove 101, which is opened in the upper part of the base 1. A screw rod 9 is rotatably connected in the slide groove 101. One end of the screw rod 9 passes through the groove wall of the slide groove 101 and is fixedly connected to the output end of the motor 10. The outer wall of the motor 10 is fixedly connected to the outer wall of the base 1. A sliding base 11 is slidably connected in the slide groove 101. The bottom of the sliding base 11 is sleeved and threadedly connected to the threaded part of the screw rod 9. The upper surface of the sliding base 11 is fixedly connected to the bottom wall of the clamping table 2 301.

[0031] The sliding device is used to change the distance between the clamping device 2 3 and the clamping device 1 2, so that the welding device can clamp and fix pressure vessels of different sizes in the horizontal direction.

[0032] The auxiliary clamping device 5 includes a plurality of slide bars 501 and a V-shaped stop bar 502. The plurality of slide bars 501 are symmetrically distributed on the front and rear sides of the base 1. A lifting rod 503 is sleeved on the outer wall of the slide bar 501 on the same side and slidably connected. A locking buckle is also provided between the lifting rod 503 and the slide bar 501 for locking and fixing the lifting rod 503 on the slide bar 501. A horizontal slot and a vertical slot are sequentially provided on the upper part of the lifting rod 503 toward the side of the base 1. The bent portion of the V-shaped stop bar 502 is fixedly connected to the output end of the electric push rod 504. A bayonet is provided on the end face of the outer cylinder of the electric push rod 504. When the bayonet is engaged in the horizontal slot, the V-shaped stop bar 502 is used to auxiliary support the vertical state of the pressure vessel cylinder to be welded. When the bayonet is engaged in the vertical slot, the V-shaped stop bar 502 is used to auxiliary support the horizontal state of the pressure vessel cylinder to be welded.

[0033] The auxiliary clamping device 5 is mainly used to provide auxiliary support for the cylinder of the pressure vessel. The V-shaped baffles 502 corresponding to the two directions are moved to the appropriate position, and the side direction of the pressure vessel cylinder is clamped and fixed under the action of the electric push rod 504, making the welding process more stable. At the same time, the setting of the V-shaped baffle 502 also makes it applicable to pressure vessels of different sizes. It should be noted that when the base 1 slides to the end point on one side of the clamping device 2, and the bayonet is engaged with the horizontal slot, the symmetry axis of the V-shaped baffle 502 intersects and is perpendicular to the axis of the pressure vessel.

[0034] The annular welding mechanism 6 includes an outer ring body 601, and the outer side wall of the outer ring body 601 is fixedly connected with two symmetrically arranged rotating shafts 602, and the outer ends of the two rotating shafts 602 are respectively rotatably connected to the upper parts of the corresponding two pillars 7, and an inner ring body 603 is embedded in and rotatably connected to the outer ring body 601. A gear ring 604 is fixedly connected to one side of the inner ring body 603, and a welding device 605 is arranged on the other side. The tooth end of the gear ring 604 is meshingly connected with a bevel gear 606, and the center of the bevel gear 606 is fixedly connected to the output end of the motor 2 607, and the outer wall of the motor 2 607 is fixedly connected to the side wall of the outer ring body 601.

[0035] The pressure vessel is inserted into the annular welding mechanism 6, and the welding device 605 is aligned with the position to be welded. Then the motor 607 drives the gear ring 604 to rotate, driving the inner ring body 603 to rotate around the pressure vessel, thereby realizing the annular welding of the pressure vessel.

[0036] The tilt adjustment device is arranged between the rotating shaft 602 and the support 7, and includes an angle monitoring unit, a control unit and an execution unit, wherein the angle monitoring unit is used to monitor the current tilt angle of the annular welding mechanism 6, and the control unit is used to receive control commands and control the execution unit to drive the rotating shaft 602 to rotate a corresponding angle.

[0037] At the same time, in order to realize that the annular welding mechanism 6 can be applied to welding of various sizes, the following structural improvements are made to it, namely:

[0038] The welding device 605 is installed at the moving end of the linear electric slide 608. The outer wall of the linear electric slide 608 is fixedly connected to the side wall of the inner ring body 603. The linear electric slide 608 drives the welding device 605 to move linearly between the center of the inner ring body 603 and the ring wall.

[0039] The welding device 605 is driven by the linear electric slide rail 608 to move linearly between the center of the inner ring body 603 and the ring wall, thereby achieving the adjustment of the annular welding rotation diameter.

[0040] Please refer to the attached Figure 7 In order to further improve the welding effect, another structural improvement is made to the annular welding mechanism 6, namely:

[0041] An electric aperture structure 609 is arranged between the welding device 605 and the inner ring body 603. The welding device 605 is installed on one of the blades of the electric aperture structure 609. The outer wall of the electric aperture structure 609 is fixedly connected to the side wall of the inner ring body 603. The welding device 605 is driven by the electric aperture structure 609 to move between the center of the inner ring body 603 and the ring wall, and the welding device 605 is always facing the center of the inner ring body 603. Preheating units and slow cooling units are also respectively arranged on the blades of the two electric aperture structures 609 adjacent to the welding device 605, which are respectively used for preheating the welding point before welding and slow cooling after welding.

[0042] On the one hand, the electric aperture structure 609 drives the welding equipment 605 to move between the center of the inner ring body 603 and the ring wall, thereby realizing the adjustment of the annular welding rotation diameter; on the other hand, by respectively arranging a preheating unit and a slow cooling unit on the blades of the two electric aperture structures 609 adjacent to the welding equipment 605, preheating before welding and slow cooling after welding are realized, thereby improving the quality of the finished welding product.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An annular welding device for a pressure vessel cylinder, comprising a base (1), characterized in that: The base (1) is provided with a clamping device 1 (2) at one end and a clamping device 2 (3) at the other end. The clamping device 1 (2) and the base (1) are connected via a hydraulic turning platform (4). When the hydraulic turning platform (4) adjusts the clamping device 1 (2) to a horizontal state, the clamping device 1 (2) corresponds to the clamping device 2 (3) and they clamp the horizontally placed cylinder of the pressure vessel to be welded together. When the hydraulic turning platform (4) adjusts the clamping device 1 (2) to a vertical state, the clamping device 1 (2) clamps the vertically placed cylinder of the pressure vessel to be welded. The clamping devices 2 (3) are connected via a sliding device, and the sliding device is used to adjust the clamping device 2 (3) to a horizontal position. A spacing of the clamping device (2), auxiliary clamping devices (5) are respectively arranged on both sides of the clamping device (2), and the auxiliary clamping devices (5) are slidably connected to the base (1) for auxiliary support of the cylinder of the pressure vessel to be welded, an annular welding mechanism (6) is arranged above the base (1), the welding part of the annular welding mechanism (6) rotates around the outer side of the cylinder of the pressure vessel to be welded and performs welding, the two ends of the annular welding mechanism (6) are respectively connected to the linear displacement device (8) through the support (7), and an inclination adjustment device is also arranged between the annular welding mechanism (6) and the support (7) for adjusting the relative inclination angle between the annular welding mechanism (6) and the cylinder of the pressure vessel to be welded.

2. The annular welding device for a pressure vessel cylinder according to claim 1, characterized in that: The clamping device (2) comprises a clamping platform (201), one side of which is fixedly connected to the turning end of the hydraulic turning platform (4), and the other side of which is provided with an internal expansion clamp (202), which extends into the cylinder of the pressure vessel to be welded and performs internal expansion clamping and fixing.

3. The annular welding device for a pressure vessel cylinder according to claim 2, characterized in that: The second clamping device (3) comprises a second clamping platform (301), and a second internal expansion clamp (302) is arranged on the side of the second clamping platform (301) opposite to the first clamping platform (201). The second internal expansion clamp (302) extends into the cylinder of the pressure vessel to be welded and performs internal expansion clamping and fixing.

4. The annular welding device for a pressure vessel cylinder according to claim 3, characterized in that: The sliding device comprises a slide groove (101) which is opened in the upper part of the base (1); a screw rod (9) is rotatably connected in the slide groove (101); one end of the screw rod (9) passes through the groove wall of the slide groove (101) and is fixedly connected to the output end of the motor (10); the outer wall of the motor (10) is fixedly connected to the outer wall of the base (1); a sliding base (11) is slidably connected in the slide groove (101); the bottom of the sliding base (11) is sleeved and threadedly connected to the threaded part of the screw rod (9); the upper surface of the sliding base (11) is fixedly connected to the bottom wall of the clamping platform (301).

5. The annular welding device for a pressure vessel cylinder according to claim 1, characterized in that: The auxiliary clamping device (5) comprises a plurality of slide bars (501) and a V-shaped stop bar (502), wherein the plurality of slide bars (501) are symmetrically distributed on the front and rear sides of the base (1), and a lifting rod (503) is sleeved on the outer wall of the slide bars (501) on the same side and slidably connected thereto, and a locking buckle is further provided between the lifting rod (503) and the slide bars (501) for locking and fixing the lifting rod (503) on the slide bars (501), and the upper part of the lifting rod (503) faces the base. A horizontal slot and a vertical slot are sequentially provided on one side of the seat (1); the bent portion of the V-shaped stopper (502) is fixedly connected to the output end of the electric push rod (504); a stopper pin is provided on the outer end surface of the electric push rod (504); when the stopper pin is engaged with the horizontal slot, the V-shaped stopper (502) is used to assist in supporting the cylinder of the pressure vessel to be welded in a vertical state; when the stopper pin is engaged with the vertical slot, the V-shaped stopper (502) is used to assist in supporting the cylinder of the pressure vessel to be welded in a horizontal state.

6. The annular welding device for a pressure vessel cylinder according to claim 1, characterized in that: The annular welding mechanism (6) comprises an outer ring body (601), the outer side wall of the outer ring body (601) is fixedly connected with two symmetrically arranged rotating shafts (602), the outer ends of the two rotating shafts (602) are respectively rotatably connected to the upper parts of the corresponding two pillars (7), an inner ring body (603) is embedded in the outer ring body (601) and rotatably connected, one side of the inner ring body (603) is fixedly connected with a gear ring (604), and the other side is provided with a welding device (605), the tooth end of the gear ring (604) is meshedly connected with a bevel gear (606), the center of the bevel gear (606) is fixedly connected to the output end of the second motor (607), and the outer wall of the second motor (607) is fixedly connected to the side wall of the outer ring body (601).

7. The annular welding device for a pressure vessel cylinder according to claim 6, characterized in that: The tilt angle adjustment device is arranged between the rotating shaft (602) and the support (7), and comprises an angle monitoring unit, a control unit and an execution unit, wherein the angle monitoring unit is used to monitor the current tilt angle of the annular welding mechanism (6), and the control unit is used to receive a control command and control the execution unit to drive the rotating shaft (602) to rotate a corresponding angle.

8. The annular welding device for a pressure vessel cylinder according to claim 6, characterized in that: The welding device (605) is installed at the moving end of a linear electric slide rail (608), the outer wall of the linear electric slide rail (608) is fixedly connected to the side wall of the inner ring body (603), and the welding device (605) is driven by the linear electric slide rail (608) to move linearly between the center of the inner ring body (603) and the ring wall.

9. The annular welding device for a pressure vessel cylinder according to claim 6, characterized in that: An electric aperture structure (609) is provided between the welding device (605) and the inner ring body (603); the welding device (605) is mounted on one of the blades of the electric aperture structure (609); the outer wall of the electric aperture structure (609) is fixedly connected to the side wall of the inner ring body (603); the welding device (605) is driven by the electric aperture structure (609) to move between the center of the inner ring body (603) and the ring wall, and the welding device (605) is always facing the center of the inner ring body (603).

10. The annular welding device for a pressure vessel cylinder according to claim 9, characterized in that: The blades of the two electric aperture structures (609) adjacent to the welding device (605) are also provided with a preheating unit and a slow cooling unit, respectively, for preheating the welding point before welding and slow cooling after welding.

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