Pressure vessel welding device

Abstract

The present invention discloses a pressure vessel welding butt joint device, which relates to the field of welding technology and comprises a welding base, wherein a fixed seat and a movable seat are sequentially arranged along a straight line on the welding base, end fixing devices are rotatably arranged on the fixed seat and the movable seat, and an extension clamping device is arranged on the opposite sides of the two end fixing devices. The present invention inserts the pressure vessel into the corresponding end fixing device, adjusts the length by the extension clamping device, and aligns the pressure vessel by squeezing the end of the pressure vessel, thereby ensuring that the axes of the two pressure vessels are parallel, and then squeezes the peripheral side of the pressure vessel by the end fixing device, so that the pressure vessel moves to the center of the end fixing device and is fixed, thereby ensuring that the two pressure vessels are coaxial, and there is no need to repeatedly adjust the fixed position of the pressure vessel, and then the movable seat is moved to the point where the ends of the two pressure vessels are in contact and stop, thereby ensuring the welding quality and welding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a pressure vessel welding butt joint device. Background Art

[0002] A pressure vessel refers to a closed device that contains gas or liquid and bears a certain pressure. In the process of making a pressure vessel, adjacent container parts need to be seamlessly welded using welding equipment. During this welding process, an auxiliary docking device is needed to support the two container parts and assist in docking the two container parts for welding.

[0003] When the existing docking device is in use, it generally only supports and fixes the two container parts. For example, the utility model patent with the authorization announcement number CN213730224U discloses a pressure vessel welding docking device, which is specifically provided with an extrusion bar and an adjustment frame. The outer surface of the adjustment rod is a two-way threaded structure, so that when the adjustment rod is rotated, the extrusion bar monomers contract and the connecting bar is pressed against the outer wall of the container part. The adjustment frame is meshed with the gear, so that the adjustment frame drives the left end container part to move to the right end, thereby easily limiting the container part. However, although the technology demonstrated in this patent supports the docking point of the container part by lifting the support part through the support rod, the support part can easily exceed the height of the bottom of the container part after rising, causing the container part to tilt upward, and the container part is fixed at one end, so that there is a gap between the two container parts when docking, so that the container part needs to be readjusted to ensure the welding quality, affecting the welding efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a pressure vessel welding and docking device, which solves the problem in the prior art that when welding a pressure vessel, the support of the container parts needs to be adjusted multiple times, which affects the welding efficiency.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A pressure vessel welding butt device comprises a welding base, on which a fixed seat and a movable seat are sequentially arranged along a straight line, and the movable seat can move along a straight line and fix its position at any position, and an end fixing device is rotatably arranged on both the fixed seat and the movable seat, and the two end fixing devices have the same structure and are coaxially arranged, and an extension clamping device is arranged on the opposite side of the two end fixing devices, and the end fixing device located on the fixed seat is connected to a rotating device, and the rotating device is fixed on the fixed seat;

[0007] Among them, the two end fixing devices are used for inserting the ends of the pressure vessel, and fixing the pressure vessel by applying extrusion force to the circumference of the pressure vessel, and the extension clamping device is used to extend and retract along the movement direction of the movable seat on the circumference of the pressure vessel, and to squeeze from the end of the pressure vessel to fix the pressure vessel, and the ends of the two extension clamping devices can be clamped and fixed to each other.

[0008] As a preferred solution of the present invention, the end fixing device located on the fixed seat includes a rotating plate rotatably connected to the fixed seat via a rotating shaft, an annular plate is concentrically arranged on the rotating plate, and the center line of the annular plate coincides with the rotation center line of the rotating device, a synchronous clamping structure for pressing the peripheral side of the pressure vessel is arranged on the peripheral side of the annular plate, and the extended clamping device is arranged on the end of the annular plate away from the rotating plate.

[0009] As a preferred scheme of the present invention, the synchronous clamping structure includes a plurality of pressure rods slidably arranged on the circumferential side of the annular plate and a guide wheel rotatably connected to the outer wall of the circumferential side of the annular plate, and the plurality of pressure rods and guide wheels are evenly arranged around the center line of the annular plate, and the plurality of pressure rods are arranged corresponding to the plurality of guide wheels. The end of each pressure rod facing away from the inside of the annular plate is connected to a traction rope, and one end of the plurality of traction ropes are respectively connected to a synchronous ring after passing around the corresponding guide wheels, and the synchronous ring is slidably sleeved on the outer wall of the annular plate, and a spring is slidably sleeved on each pressure rod, and one end of the spring is abutted against the outer wall of the annular plate, and the other end is fixedly connected to the end of the pressure rod facing away from the annular plate, and a linear motion mechanism connected to the synchronous ring is arranged on the outer wall of the annular plate, and the linear motion mechanism moves along the center line of the annular plate.

[0010] As a preferred solution of the present invention, the extension clamping device comprises a plurality of extension components uniformly arranged at the end of the annular plate around the center line of the annular plate, the ends of the plurality of extension components are commonly fixedly connected with a connecting ring, a plurality of sliding limit components and a plurality of snap-on components are arranged on the side of the connecting ring away from the extension component, and the plurality of sliding limit components and the plurality of snap-on components are uniformly and alternately arranged on the connecting ring around the center line of the annular plate, a linear drive device is connected to one of the extension components, and the linear drive device is used to drive one of the extension components to extend and retract along the direction of movement of the movable seat;

[0011] The sliding limit assembly slides along the radial direction of the annular plate, and abuts against the end of the pressure vessel when sliding into the annular plate, and is plugged and fixed with the corresponding clamping assembly when sliding out of the annular plate.

[0012] As a preferred solution of the present invention, the extension component includes an extension plate that slides through one side of the annular plate, a sliding groove is provided on the inner wall of the annular plate along the movement direction of the movable seat, and the extension plate is slidably connected in the sliding groove and is located on the same curved surface as the inner surface of the annular plate, and the linear drive device is connected to one of the extension plates.

[0013] As a preferred solution of the present invention, the sliding limit assembly includes a connecting seat arranged on one side of the connecting ring, the connecting seat is provided with a through groove, a limit plate is slidingly connected in the through groove, and the limit plate slides radially along the connecting ring and has damping when sliding in the through groove.

[0014] As a preferred solution of the present invention, a plurality of telescopic components are arranged on the outer wall of the connecting ring, and the telescopic components are connected to the limiting plate and drive the limiting plate to move along the radial direction of the connecting ring.

[0015] As a preferred solution of the present invention, the clamping assembly includes a clamping seat arranged on the connecting ring, and the clamping seat is provided with a clamping groove for inserting a limiting plate on another connecting ring.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention inserts the pressure vessel into the corresponding end fixing device, adjusts the length by extending the clamping device, and aligns the pressure vessel by squeezing the end of the pressure vessel, thereby ensuring that the axes of the two pressure vessels are parallel. The circumference of the pressure vessel is then squeezed by the end fixing device, so that the pressure vessel moves to the center of the end fixing device and is fixed, thereby ensuring that the two pressure vessels are coaxial, and there is no need to repeatedly adjust the fixing position of the pressure vessel. The movable seat is then moved to the point where the ends of the two pressure vessels are in contact and stop, thereby ensuring welding quality and welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the connecting ring of the present invention;

[0022] Figure 4 for Figure 1 A schematic diagram of the structure enlargement of part A shown in FIG.

[0023] Figure 5 for Figure 1 An enlarged schematic diagram of the structure of part B is shown in FIG.

[0024] The numbers in the figure represent the following:

[0025] 1. Welding base; 2. Fixed seat; 3. Movable seat; 4. End fixing device; 5. Extension clamping device; 6. Rotating device;

[0026] 401, rotating plate; 402, annular plate; 403, synchronous clamping structure; 404, pressure rod; 405, guide wheel; 406, synchronous ring; 407, spring; 408, linear motion mechanism; 409, traction rope; 501, extension assembly; 502, connecting ring; 503, sliding limit assembly; 504, clamping assembly; 505, extension plate; 506, slide groove; 507, linear drive device; 508, connecting seat; 509, through groove; 510, limit plate; 511, telescopic assembly; 512, clamping seat; 513, clamping groove. DETAILED DESCRIPTION

[0027] 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.

[0028] like Figures 1 to 5 As shown, the present invention provides a pressure vessel welding butt device, including a welding base 1, on which a fixed seat 2 and a movable seat 3 are sequentially arranged along a straight line, and the movable seat 3 can move along a straight line and fix its own position at any position, and end fixing devices 4 are rotatably arranged on the fixed seat 2 and the movable seat 3, and the two end fixing devices 4 have the same structure and are coaxially arranged, and an extended clamping device 5 is arranged on the opposite side of the two end fixing devices 4, and the end fixing device 4 located on the fixed seat 2 is connected to a rotating device 6, and the rotating device 6 is fixed on the fixed seat 2.

[0029] Among them, the two end fixing devices 4 are used for inserting the ends of the pressure vessel, and fix the pressure vessel by applying extrusion force to the circumferential side of the pressure vessel, and the extension clamping device 5 is used to extend and retract along the movement direction of the movable seat 3 on the circumferential side of the pressure vessel, and squeeze from the end of the pressure vessel to fix the pressure vessel, and the ends of the two extension clamping devices 5 can be clamped and fixed to each other.

[0030] When the present invention is actually used, the position of the movable seat 3 is adjusted according to the length of the pressure vessel (i.e., the container part to be welded, hereinafter referred to as the pressure vessel) so that there is a sufficient spacing between the two end fixing devices 4 to ensure that the pressure vessel can be inserted into the corresponding end fixing device 4, and then the length of the extension clamping device 5 is adjusted along the movement direction of the movable seat 3 (i.e., the horizontal direction) to match the length of the pressure vessel, so that the extension clamping device 5 is tightly abutted against the end of the pressure vessel until the extension clamping device 5 corrects the position of the pressure vessel to a horizontal level so that the central axes of the two pressure vessels are parallel.

[0031] Then, the end fixing device 4 squeezes the pressure vessel from the circumference of the pressure vessel. Since the pressure vessel is located at the lowest point, the lowest part of the end fixing device 4 first contacts the surface of the pressure vessel, so that the pressure vessel moves toward the center of the end fixing device 4 under the squeezing force of the end fixing device 4 until the surface of the pressure vessel is completely against the end fixing device 4, and since the two end fixing devices 4 are coaxially arranged, the central axes of the two pressure vessels coincide, and then the movable seat 3 moves toward the direction of the fixed seat 2. When the two pressure vessels are about to contact, the extended clamping device 5 disengages from the end of the pressure vessel (or the extended clamping device 5 disengages from the pressure vessel after the end fixing device 4 fixes the pressure vessel, to ensure that the opposite ends of the two pressure vessels can contact for welding), and in the process of the movable seat 3 continuing to move, the ends of the two extended clamping devices 5 are clamped, and the movable seat 3 stops moving after the ends of the two pressure vessels are against each other. At this time, the two pressure vessels are coaxially docked, which ensures the welding quality of the pressure vessels, and there is no need to repeatedly adjust the fixed position of the pressure vessels, thereby improving the welding efficiency.

[0032] Since the ends of the two extended clamping devices 5 are clamped, the two end fixing devices 4 can be driven to rotate synchronously through the provided rotating device 6, thereby driving the two pressure vessels to rotate synchronously, making the pressure vessels more convenient during welding.

[0033] In this embodiment, the movable seat 3 and the rotating device 6 are both existing technologies. For example, the movable seat 3 drives the seat body to move by a motor-driven screw, and the rotating device 6 is an existing device that drives the corresponding structure to rotate, such as direct motor drive.

[0034] The end fixing device 4 located on the fixing seat 2 includes a rotating plate 401 rotatably connected to the fixing seat 2 via a rotating shaft, an annular plate 402 is concentrically arranged on the rotating plate 401, and the center line of the annular plate 402 coincides with the rotation center line of the rotating device 6, a synchronous clamping structure 403 for pressing the peripheral side of the pressure vessel is arranged on the peripheral side of the annular plate 402, and an extended clamping device 5 is arranged on the end of the annular plate 402 away from the rotating plate 401.

[0035] When the end fixing device 4 is fixing the pressure vessel, the synchronous clamping structure 403 squeezes the pressure vessel from the circumferential side of the pressure vessel. The synchronous clamping structure 403 first contacts the bottom of the pressure vessel, so that the pressure vessel gradually rises to the central axis of the annular plate 402 under the squeezing force of the synchronous clamping structure 403, and gradually contacts other parts of the synchronous clamping structure 403, thereby fixing the pressure vessel by squeezing the circumferential side of the pressure vessel by the synchronous clamping structure 403.

[0036] The rotating device 6 drives the rotating plate 401 to rotate by driving the rotating shaft, thereby driving the annular plate 402 and the pressure container inside it to rotate synchronously, so that the two pressure containers can be rotated and welded after the docking is completed, thereby improving the convenience of welding.

[0037] The synchronous pressing structure 403 includes a plurality of pressing rods 404 that are slidably arranged on the circumference of the annular plate 402 and a guide wheel 405 that is rotatably connected to the outer wall of the circumference of the annular plate 402, and the plurality of pressing rods 404 and the guide wheel 405 are evenly arranged around the center line of the annular plate 402, and the plurality of pressing rods 404 are arranged correspondingly to the plurality of guide wheels 405, and one end of each pressing rod 404 that is away from the inside of the annular plate 402 is connected to a traction rope 409, and one end of the plurality of traction ropes 409 is respectively passed around the corresponding guide wheels. The wheels 405 are connected to a synchronizer ring 406 behind them, and the synchronizer ring 406 is slidably sleeved on the outer wall of the annular plate 402. A spring 407 is slidably sleeved on each pressure rod 404, and one end of the spring 407 is against the outer wall of the annular plate 402, and the other end is fixedly connected to an end of the pressure rod 404 away from the annular plate 402. A linear motion mechanism 408 connected to the synchronizer ring 406 is provided on the outer wall of the annular plate 402, and the linear motion mechanism 408 moves along the center line of the annular plate 402.

[0038] The linear motion mechanism 408 drives the synchronization ring 406 to move along the center line of the annular plate 402. When the synchronization ring 406 approaches the guide wheel 405, the traction rope 409 relaxes, so that the pressure rod 404 slides on the annular plate 402 to a position away from the center of the annular plate 402 under the elastic force of the spring 407, so that the end of the pressure rod 404 located inside the annular plate 402 is out of contact with the pressure vessel, but the end of the pressure rod 404 below keeps in contact with the surface of the pressure vessel, and together with the extension clamping device 5, the pressure vessel is carried gradually downward to prevent the pressure vessel from falling and being damaged.

[0039] When the synchronizer ring 406 moves away from the guide wheel 405 driven by the linear motion mechanism 408, multiple traction ropes 409 are pulled by the synchronizer ring 406 at the same time. Guided by the guide wheel 405, the pressure rod 404 moves toward the inside of the annular plate 402 under the traction of the traction rope 409. At this time, the spring 407 is compressed and abuts against the peripheral side of the pressure vessel through multiple pressure rods 404, thereby completing the fixation of the pressure vessel and lifting the pressure vessel until the central axis of the pressure vessel coincides with the central axis of the annular plate 402, so that the two pressure vessels are coaxial after docking, thereby ensuring the welding quality and eliminating the need to repeatedly adjust the fixed position of the pressure vessel, thereby improving the welding efficiency.

[0040] The extension clamping device 5 includes a plurality of extension components 501 uniformly arranged at the end of the annular plate 402 around the center line of the annular plate 402, and the ends of the plurality of extension components 501 are commonly fixedly connected with a connecting ring 502, and a plurality of sliding limit components 503 and a plurality of snap-in components 504 are arranged on the side of the connecting ring 502 away from the extension component 501, and the plurality of sliding limit components 503 and the plurality of snap-in components 504 are uniformly and alternately arranged on the connecting ring 502 around the center line of the annular plate 402, and a linear drive device 507 is connected to one of the extension components 501, and the linear drive device 507 is used to drive one of the extension components 501 to extend and retract along the direction of movement of the movable seat 3.

[0041] The sliding limit assembly 503 slides along the radial direction of the annular plate 402 , and abuts against the end of the pressure vessel when sliding into the annular plate 402 , and is plugged and fixed with the corresponding clamping assembly 504 when sliding out of the annular plate 402 .

[0042] After the extension clamping device 5 is inserted into the annular plate 402, the linear drive device 507 starts to drive the connecting ring 502 to move away from the annular plate 402, so that the multiple extension components 501 are extended to adapt to the length of the pressure vessel when passing through the connecting ring 502, and the multiple sliding limit components 503 slide toward the center of the connecting ring 502. Subsequently, the extension component 501 is shortened by the drive of the linear drive device 507 until the sliding limit component 503 and the end of the pressure vessel are abutted, so that the pressure vessel is straightened when the sliding limit component 503 squeezes its end, that is, the central axis of the pressure vessel is horizontal and parallel to the central axis of the annular plate 402.

[0043] After the end fixing device 4 fixes the pressure vessel, the sliding limit assembly 503 moves in a direction away from the center of the annular plate 402 to release the contact with the end of the pressure vessel, and is plugged into the corresponding snap-fit ​​assembly 504 on the other connecting ring 502, so that the two annular plates 402 can rotate synchronously through the snap-fit ​​cooperation between the snap-fit ​​assembly 504 and the sliding limit assembly 503, thereby driving the two pressure vessels to rotate synchronously for welding, thereby improving the convenience of welding.

[0044] The extension assembly 501 includes an extension plate 505 that slides through one side of the annular plate 402. A slide groove 506 is provided on the inner wall of the annular plate 402 along the movement direction of the movable seat 3. The extension plate 505 is slidably connected in the slide groove 506 and is located on the same curved surface as the inner surface of the annular plate 402. The linear drive device 507 is connected to one of the extension plates 505.

[0045] The extension plate 505 is driven by the connection ring 502 to extend or retract along the slide groove 506 to adapt to different lengths of pressure vessels, thereby improving the application range of the device.

[0046] The sliding limit assembly 503 includes a connecting seat 508 arranged on one side of the connecting ring 502. A through slot 509 is opened on the connecting seat 508. A limit plate 510 is slidingly connected in the through slot 509. The limit plate 510 slides radially along the connecting ring 502 and has damping when sliding in the through slot 509.

[0047] The sliding limit assembly 503 slides along the through groove 509 by moving the limit plate 510, so that it can slide radially along the connecting ring 502, and the limit plate 510 is fixed by the damping between the limit plate 510 and the through groove 509, ensuring the stability of the limit plate 510 when it abuts against the end of the pressure vessel and the stability of the limit plate 510 when it is plugged into the snap-in assembly 504.

[0048] A plurality of telescopic components 511 are disposed on the outer wall of the connecting ring 502 . The telescopic components 511 are connected to the limiting plate 510 and drive the limiting plate 510 to move along the radial direction of the connecting ring 502 .

[0049] The telescopic component 511 is provided to drive the limiting plate 510 to move, thereby improving the convenience of use.

[0050] In this embodiment, the linear drive device 507 and the telescopic assembly 511 are both existing technologies, such as driving the limit plate 510 or the extension plate 505 to move by rotating the screw driven by a motor, and being able to drive the limit plate 510 and the extension plate 505 to move along a straight line.

[0051] The clamping assembly 504 includes a clamping seat 512 disposed on the connecting ring 502 . The clamping seat 512 is provided with a clamping groove 513 for inserting the limiting plate 510 on another connecting ring 502 .

[0052] The limit plate 510 moves radially toward the outside of the connecting ring 502 and is inserted into the corresponding snap-in groove 513. Through the matching connection between the limit plate 510 and the snap-in groove 513, the rotating device 6 can drive the two pressure vessels to rotate synchronously when driving the rotating plate 401 to rotate, thereby avoiding the problem of cracks in the weld due to the asynchronous rotation of the two pressure vessels, ensuring the welding quality, and improving the convenience of use.

[0053] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A pressure vessel welding butt joint device, comprising a welding base (1), characterized in that: The welding base (1) is provided with a fixed seat (2) and a movable seat (3) in sequence along a straight line, and the movable seat (3) is capable of moving along a straight line and fixing its own position at any position, and the fixed seat (2) and the movable seat (3) are both rotatably provided with an end fixing device (4), the two end fixing devices (4) have the same structure and are coaxially arranged, and the two end fixing devices (4) are provided with an extended clamping device (5) on opposite sides, and the end fixing device (4) located on the fixed seat (2) is connected to a rotating device (6), and the rotating device (6) is fixed on the fixed seat (2); The two end fixing devices (4) are used for inserting the ends of the pressure vessel and fixing the pressure vessel by applying a squeezing force to the circumference of the pressure vessel, and the extending clamping device (5) is used for extending and retracting along the movement direction of the movable seat (3) on the circumference of the pressure vessel and squeezing from the end of the pressure vessel to fix the pressure vessel, and the ends of the two extending clamping devices (5) can be mutually clamped and fixed; The end fixing device (4) located on the fixing seat (2) comprises a rotating plate (401) rotatably connected to the fixing seat (2) via a rotating shaft, an annular plate (402) is coaxially arranged on the rotating plate (401), and the center line of the annular plate (402) coincides with the rotation center line of the rotating device (6), a synchronous pressing structure (403) for pressing the peripheral side of the pressure vessel is arranged on the peripheral side of the annular plate (402), and the extending clamping device (5) is arranged on the end of the annular plate (402) away from the rotating plate (401); The extension clamping device (5) comprises a plurality of extension components (501) uniformly arranged at the end of the annular plate (402) around the center line of the annular plate (402), the ends of the plurality of extension components (501) are commonly fixedly connected to a connecting ring (502), a plurality of sliding limit components (503) and a plurality of snap-on components (504) are arranged on a side of the connecting ring (502) away from the extension components (501), and the plurality of sliding limit components (503) and the plurality of snap-on components (504) are uniformly and alternately arranged on the connecting ring (502) around the center line of the annular plate (402), one of the extension components (501) is connected to a linear drive device (507), and the linear drive device (507) is used to drive one of the extension components (501) to extend and retract along the direction of movement of the movable seat (3); The sliding limit assembly (503) slides radially along the annular plate (402), and abuts against the end of the pressure vessel when sliding into the annular plate (402), and is plugged and fixed with the corresponding clamping assembly (504) when sliding outside the annular plate (402).

2. The pressure vessel welding butt joint device according to claim 1, characterized in that: The synchronous clamping structure (403) comprises a plurality of pressure rods (404) slidably arranged on the circumferential side of the annular plate (402) and a guide wheel (405) rotatably connected to the circumferential outer wall of the annular plate (402), and the plurality of pressure rods (404) and the plurality of guide wheels (405) are evenly arranged around the center line of the annular plate (402), the plurality of pressure rods (404) and the plurality of guide wheels (405) are arranged correspondingly, and one end of each of the pressure rods (404) away from the inside of the annular plate (402) is connected to a traction rope (409), and one end of the plurality of traction ropes (409) passes through the corresponding guide wheels. The wheels (405) are connected to a synchronous ring (406) at the rear, and the synchronous ring (406) is slidably sleeved on the outer wall of the annular plate (402). Each of the pressure rods (404) is slidably sleeved with a spring (407), and one end of the spring (407) is against the outer wall of the annular plate (402), and the other end is fixedly connected to an end of the pressure rod (404) away from the annular plate (402). A linear motion mechanism (408) connected to the synchronous ring (406) is provided on the outer wall of the annular plate (402), and the linear motion mechanism (408) moves along the center line of the annular plate (402).

3. The pressure vessel welding butt joint device according to claim 1, characterized in that: The extension assembly (501) comprises an extension plate (505) slidingly passing through one side of the annular plate (402); a slide groove (506) is provided on the inner side wall of the annular plate (402) along the movement direction of the movable seat (3); and the extension plate (505) is slidably connected in the slide groove (506) and is located on the same curved surface as the inner surface of the annular plate (402); and the linear drive device (507) is connected to one of the extension plates (505).

4. The pressure vessel welding butt joint device according to claim 1, characterized in that: The sliding limit assembly (503) comprises a connecting seat (508) arranged on one side of the connecting ring (502), a through slot (509) being provided on the connecting seat (508), a limit plate (510) being slidably connected in the through slot (509), and the limit plate (510) slides in the radial direction of the connecting ring (502) and has damping when sliding in the through slot (509).

5. The pressure vessel welding butt joint device according to claim 4, characterized in that: A plurality of telescopic components (511) are arranged on the outer wall of the connecting ring (502), and the telescopic components (511) are connected to the limiting plate (510) and drive the limiting plate (510) to move radially along the connecting ring (502).

6. The pressure vessel welding butt joint device according to claim 4, characterized in that: The clamping assembly (504) comprises a clamping seat (512) arranged on the connecting ring (502), and the clamping seat (512) is provided with a clamping groove (513) for inserting a limiting plate (510) on another connecting ring (502).

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