Positioning device for girth welding of pressure vessel

Abstract

The invention belongs to the technical field of welding, and particularly discloses a pressure vessel girth welding positioning device which comprises a welding frame, a vertical driving mechanism, a guide frame, fire-resistant cloth and a transmission mechanism, the upper portion of the welding frame drives two pressure tanks to rotate through the transmission mechanism, and a vertical seat is fixedly installed at one end of the welding frame; the vertical driving mechanism is arranged above the vertical seat, a sliding seat capable of moving up and down is arranged outside the vertical driving mechanism, the guide frame is fixedly installed on the outer wall of one side of the sliding seat, a welding device is connected to the position, close to the upper portion of the guide frame, of the outer wall of the sliding seat through a multi-section hydraulic cylinder, and a welding gun is connected to the lower portion of the interior of the welding device. The welding device slides above the outer portion of the guide frame, supporting bases are symmetrically installed on the two sides of the outer wall of the welding device, traditional simple fire-resistant cloth is protected and directionally distributed around a welding gun, the fire-resistant cloth can be rapidly detached and replaced according to needs, and the safety, continuity and automation degree of welding operation are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, and specifically discloses a positioning device for circumferential weld of pressure vessels. Background Technology

[0002] In the manufacturing and maintenance of pressure vessels, circumferential welding is a crucial and technically challenging core process. As pressure-bearing equipment, the quality of the circumferential weld directly affects the safe operation and service life of the equipment. Currently, automated welding technologies (such as welding robots and automated welding machines) are widely used in circumferential welding to improve efficiency and quality consistency.

[0003] However, the high-temperature electric arc, plasma beam, laser, and accompanying molten metal spatter and incandescent weld slag generated during the welding process pose significant safety and quality risks. Especially for welding methods with intense spatter, such as gas metal arc welding (GMAW), flux-cored wire arc welding (FAW), and plasma arc welding with extremely high energy density and coexisting plumes and spatter, fireproofing is an essential procedure. Even in tungsten inert gas (TIG) welding or laser welding, which involve relatively less spatter, the high-temperature arc light, heat radiation, and occasional molten droplets still pose a threat to flammable materials, equipment cables, hydraulic lines, and the smooth surfaces of containers in the working environment.

[0004] To address the aforementioned risks, existing technologies generally employ a simplistic solution: a simple metal frame externally connected to the welding torch nozzle or body creates a cage-like or enclosed space around the torch. Sheet-like refractory cloth is then secured to this frame via bundling, clamping, or simple hooks. The internal refractory cloth is typically loosely folded or stacked, intended to unfold for shielding when needed. However, this simplistic integration method has serious shortcomings. Essentially, it merely attaches a static protective cloth to the mobile device, failing to achieve true intelligent, dynamic protection. The loosely secured refractory cloth and external frame are prone to displacement or detachment during welding due to vibration or snagging, potentially interfering with the welding torch's normal trajectory or even getting caught in the wire feeding mechanism, causing malfunctions. Its protruding external structure also increases the risk of collision and interference in confined spaces such as inside containers.

[0005] Therefore, this method affects the welding process and needs to be improved. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the background art, and to propose a positioning device for circumferential welding of pressure vessels, including a welding frame, a vertical drive mechanism, a guide frame, refractory cloth, and a transmission mechanism. Two pressure vessels are driven to rotate above the welding frame via the transmission mechanism. A stand is fixedly installed at one end of the welding frame. The vertical drive mechanism is located above the stand. A slide that moves up and down is provided outside the vertical drive mechanism. The guide frame is fixedly installed on the outer wall of one side of the slide. A welding device is connected to the outer wall of the slide, near the top of the guide frame, via a multi-section hydraulic cylinder. The welding device contains... A welding torch is connected below. The welding device slides above the outside of the guide frame. Support seats are symmetrically installed on both sides of the outer wall of the welding device. The two support seats are connected to the guide platform through support rods installed at both ends of the bottom. A double-sided arc frame is set below the guide platform. The top of the two support seats is connected to the double-sided arc frame through a top support mechanism. The two ends of the double-sided arc frame are connected to the retaining housing for refractory cloth through corresponding elastic clamping parts. The refractory cloth is clamped by symmetrically installed locking parts inside the retaining housing. A groove is opened in the middle of the refractory cloth to facilitate welding with the welding torch.

[0007] In the above technical solution, the vertical drive mechanism further includes a vertical box fixedly installed above the stand, and a sliding block is driven to move up and down through a lifting drive mechanism inside the vertical box. A control box is fixedly installed on one side of the outer wall of the vertical box near the bottom.

[0008] In the above technical solution, the transmission mechanism further includes bearing platforms symmetrically installed above the welding frame. Each bearing platform is equipped with a drive wheel. The multiple drive wheels are connected by a through-drive shaft. One end of one drive shaft is fixedly mounted with a motor. The bottom of the motor is mounted on one side of the welding frame via a fixedly mounted base.

[0009] In the above technical solution, the top support mechanism further includes a cylinder fixedly installed above the support base. A connecting shell is fixedly installed on the telescopic end of the cylinder. L-shaped rods are fixedly installed on both sides of the outer side of the connecting shell. The lower ends of the two L-shaped rods slide through the bottom of the support base and are connected to connectors accordingly. Connecting blocks are fixedly installed on the side of the two connectors that are close to each other.

[0010] In the above technical solution, the elastic clamping component further includes clamping cylinders fixedly installed on both sides of the outer wall of one end of the double-sided arc frame. Clamping rods are slidably inserted into the lower part of the connecting block. A ring plate is fixedly sleeved on the outside of one end of the clamping rod. A spring is sleeved on the outside of the clamping rod and on the side close to the ring plate. One end of the clamping rod slides through the inside of the double-sided arc frame and extends into the inside of the clamping cylinder, for clamping the clamping case inside the double-sided arc frame.

[0011] In the above technical solution, the locking component further includes a screw cylinder that is installed through the upper part of the housing, and a locking pin is threaded inside the screw cylinder, the end of which abuts against the outer surface of the fire-resistant cloth.

[0012] In the above technical solution, further, a support platform is provided on the outer surface of both ends of the double-sided arc frame. The support platform is a rectangular frame. Extension plates extend from both sides of the outer wall of the support platform and near the middle. The extension plates and the support platform are integrally formed.

[0013] In the above technical solution, an injection device is fixedly installed inside the upper part of the support platform. An injection tube is connected to one side of the injection device. An injection tube is connected to the lower end of the injection device. An airtightness tester is fixedly installed at the bottom of both extension plates. The airtightness tester is used to test the airtightness of the weld. An inductive controller is fixedly installed on one side of the outer wall of one of the extension plates. The inductive controller is electrically connected to the airtightness tester.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention abandons the loose fixing method of simply binding the refractory cloth to an external frame. Instead, it modularly and securely integrates the refractory cloth under the welding device using a double-sided arc-shaped frame, a clip with elastic clamping elements, and locking components. This effectively eliminates the risk of displacement, detachment, or snagging of the refractory cloth due to welding vibration or equipment movement, ensuring uninterrupted welding. Simultaneously, the modular clamping and locking design allows for rapid replacement or maintenance of the refractory cloth, significantly reducing downtime during non-operational periods, making it particularly suitable for automated, continuous production lines.

[0015] 2. This invention connects the double-sided arc-shaped frame and refractory cloth to the welding device via a support base, guide platform, and top support mechanism, allowing the protected area to be covered synchronously with the welding torch. This overcomes the problems of protective gaps and over-protection areas inherent in traditional large-area refractory cloth laying, achieving optimal local protection against splashing flames. Furthermore, the pre-set groove in the center of the refractory cloth ensures the welding torch can work freely while forming a ring-shaped barrier adjacent to the molten pool, providing effective protection even in space-constrained conditions.

[0016] 3. This invention achieves longitudinal and lateral adjustment of the welding torch through a vertical drive mechanism, guide frame, multi-section hydraulic cylinder, and slide block. The transmission mechanism drives the workpiece to rotate at a uniform speed, which, combined with the welding device itself, ensures precise positioning of the welding torch relative to the circumferential weld trajectory. This results in more uniform circumferential welding.

[0017] 4. This invention, by setting support platforms with injection devices and airtightness testing instruments at both ends of a double-sided arc-shaped frame, allows for auxiliary quality inspection steps such as spraying penetrant testing liquid and preliminary inspection of weld airtightness immediately after the welding process is completed. The integrated design merges the welding and preliminary inspection processes, shortening process turnaround time and allowing for the immediate detection of potential surface opening defects, providing instant feedback for quality control. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is another schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the overall connection structure of the vertical drive mechanism of the present invention; Figure 4 This is a schematic diagram of the connection structure between the support base, welding device, and guide platform of the present invention; Figure 5 This is a schematic diagram from another angle showing the connection structure between the support base, welding device, and guide platform of the present invention. Figure 6 This is a schematic diagram of the connection structure between the welding device and the guide table of the present invention; Figure 7 This is a schematic diagram of the connection structure between the top support mechanism and the double-sided arc frame of the present invention; Figure 8 This is another schematic diagram of the connection structure between the top support mechanism and the double-sided arc frame of the present invention; Figure 9 This is a schematic diagram of the connection structure between the double-sided arc-shaped frame and the elastic clamping member of the present invention; Figure 10 This is a schematic diagram showing the disassembled connection structure between the double-sided arc frame, the retaining shell, and the elastic clamping element of the present invention; Figure 11 This is a schematic diagram showing the connection structure between the locking component and the retaining shell of the present invention.

[0019] In the diagram: 1. Welding frame; 2. Stand; 3. Control box; 4. Stand; 5. Lifting drive mechanism; 6. Multi-section hydraulic cylinder; 7. Welding device; 8. Guide frame; 9. Slide; 10. Drive wheel; 11. Drive shaft; 12. Motor; 13. Support base; 14. Guide platform; 15. Connecting shell; 16. Cylinder; 17. Support rod; 18. Injection tube; 19. L-shaped rod; 20. Connecting block; 21. Double-sided arc frame; 22. Support platform; 23. Injection device; 24. Extension plate; 25. Clamping rod; 26. Welding torch; 27. Liquid injection tube; 28. Induction controller; 29. ​​Refractory cloth; 30. Spring; 31. Clamping case; 32. Locking pin; 33. Screw barrel; 34. Connector; 35. Clamping sleeve; 36. Ring plate; 37. Air tightness tester. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0022] like Figures 1-11 The pressure vessel circumferential weld positioning device shown includes a welding frame 1, a vertical drive mechanism, a guide frame 8, a refractory cloth 29, and a transmission mechanism. Two pressure vessels are driven to rotate above the welding frame 1 via the transmission mechanism. A stand 2 is fixedly installed at one end of the welding frame 1. The vertical drive mechanism is positioned above the stand 2. A sliding block 9 that moves vertically is provided outside the vertical drive mechanism. The guide frame 8 is fixedly installed on one side of the outer wall of the sliding block 9. A welding device 7 is connected to the outer wall of the sliding block 9, near the top of the guide frame 8, via a multi-section hydraulic cylinder 6. A welding torch 26 is connected to the lower part of the welding device 7. The welding device 7 is located outside the guide frame 8. The upper part slides, and the welding device 7 has symmetrical support seats 13 installed on both sides of the outer wall. The two support seats 13 are connected to the guide table 14 through the support rods 17 installed at both ends of the bottom. The guide table 14 is provided with a double-sided arc frame 21. The upper part of the two support seats 13 is connected to the double-sided arc frame 21 through the provided top support mechanism. The two ends of the double-sided arc frame 21 are connected to the housing 31 for receiving the fireproof cloth 29 through the corresponding elastic clamping parts. The fireproof cloth 29 is clamped by the symmetrically installed locking parts inside the housing 31. The fireproof cloth 29 has a groove in the middle of the interior to facilitate welding by the welding gun 26. In this embodiment, the guide frame 8 is a linear guide rail. Through the extension and retraction drive of the multi-section hydraulic cylinder 6, the welding device 7 can move horizontally outside the guide frame 8. The welding device 7 consists of a housing, a welding torch 26, and a wire feeding mechanism. The welding torch 26 can perform welding operations at the connection of two pressure tanks. The fireproof cloth 29 is made of high-temperature resistant glass fiber or silicon titanium fireproof cloth coated with silicone. The working groove corresponding to the position of the welding torch 26 can be manually cut in the middle. Specifically, during operation, the pressure vessel is driven to rotate, while the welding torch 26 remains in a fixed spatial position to complete the circumferential weld. The entire double-sided arc frame 21 is connected to the welding device 7 via the support base 13, thus ensuring that the protective position of the refractory cloth 29 is always aligned with the position of the welding torch 26. By adjusting the height of the double-sided arc frame 21 through the top support mechanism, the refractory cloth 29 can cover the weld pool at the optimal distance, catching spatter. The design of the retaining case 31 and locking mechanism enables quick installation and replacement of the refractory cloth 29.

[0023] The vertical drive mechanism includes a vertical box 4 fixedly installed above the support 2. The slide 9 moves up and down through a lifting drive mechanism 5 inside the vertical box 4. A control box 3 is fixedly installed on one side of the outer wall of the vertical box 4 near the bottom. In this embodiment, the lifting drive mechanism 5 is composed of a ball screw and a corresponding servo motor, which is used to drive the slide 9 to move up and down. The slide 9 slides against the inner wall of the vertical box 4, thereby restricting the rotation of the slide 9. The externally set control box 3 integrates PLC, driver and other electrical control components, which are used to control the lifting drive mechanism 5, welding power supply and other execution components.

[0024] The transmission mechanism includes bearing platforms symmetrically mounted above the welding frame 1. Each bearing platform is equipped with a drive wheel 10. The multiple drive wheels 10 are connected by a through drive shaft 11. One end of one drive shaft 11 is fixedly mounted with a motor 12. The bottom of the motor 12 is mounted on one side of the welding frame 1 via a fixed base. In this embodiment, the surface of the drive wheel 10 can be covered with rubber to increase friction. The drive wheel 10 is linked by a drive shaft 11 that passes through it. One end of one of the drive shafts 11 is connected to a motor 12 via a coupling. The motor 12 is fixed to one side of the welding frame 1 by a base. After placing the two pressure tanks side by side on the drive wheel 10 and aligning them with the center, starting the motor 12 will cause the pressure tanks to rotate at a uniform speed through the synchronous rotation of the drive wheel 10, thus completing the necessary foundation for circumferential welding.

[0025] The top support mechanism includes a cylinder 16 fixedly installed above the support base 13. A connecting shell 15 is fixedly installed at the telescopic end of the cylinder 16. L-shaped rods 19 are fixedly installed on both sides of the outer side of the connecting shell 15. The lower ends of the two L-shaped rods 19 slide through the bottom of the support base 13 and are connected to connectors 34. Connecting blocks 20 are fixedly installed on the side of the two connectors 34 that are close to each other. The elastic clamping element includes clamping cylinders 35 fixedly installed on both sides of the outer wall of one end of the double-sided arc frame 21. The lower part of the connecting blocks 20 slides inside. A clamping rod 25 is inserted, and a ring plate 36 is fixedly sleeved on one end of the clamping rod 25. A spring 30 is sleeved on the outside of the clamping rod 25 and on the side close to the ring plate 36. One end of the clamping rod 25 slides through the inside of the double-sided arc frame 21 and extends into the inside of the clamping cylinder 35 to clamp the clamping case 31 into the inside of the double-sided arc frame 21. The locking component includes a screw cylinder 33 that is installed through the inside of the clamping case 31. A locking pin 32 is threaded inside the screw cylinder 33. The end of the locking pin 32 abuts against the outer surface of the fire-resistant cloth 29. In this embodiment, each set of support bases 13 has a corresponding sliding hole for the L-shaped rod 19. With the connection of the connector 34, the L-shaped rod 19, and the connecting block 20, the extension and retraction of the cylinder 16 can drive the double-sided arc frame 21 to move up and down. On the one hand, it can reserve space for the corresponding assembly when installing the fireproof cloth 29. On the other hand, it can adjust the coverage height of the fireproof cloth 29 during the welding process of the welding torch 26, thereby shielding the electric arc sparks. On each of the two outer side walls at one end of the double-sided arc frame 21, a retaining sleeve 35 is fixedly installed, with a retaining hole inside the retaining sleeve 35. Correspondingly, a through hole is opened at the lower part of the connecting block 20, through which a retaining rod 25 slides. In its natural state, the elastic force of the spring 30 pushes the retaining rod 25 into the interior of the double-sided arc frame 21. When installing the fire-resistant cloth 29, when the retaining case 31 of the fire-resistant cloth 29 is inserted into the double-sided arc frame 21, the retaining sleeves 35 on both sides of the retaining case 31 squeeze the retaining rod 25, causing the retaining rod 25 to squeeze the spring 30 and move away from the exterior of the double-sided arc frame 21. After the retaining case 31 is inserted into place, the retaining rod 25 automatically springs into the retaining hole of the retaining sleeve 35 under the action of the spring 30, completing the quick locking. Then, the locking pin 32 is rotated to press the fire-resistant cloth 29.

[0026] The outer surfaces of both ends of the double-sided arc frame 21 are provided with support platforms 22. The support platforms 22 are rectangular frames. Extension plates 24 extend from both sides of the outer wall of the support platform 22 and near the middle. The extension plates 24 and the support platforms 22 are integrally formed. An injection device 23 is fixedly installed inside the upper part of the support platform 22. An injection tube 27 is connected to one side of the injection device 23. An injection tube 18 is connected to the lower end of the injection device 23. An air tightness tester 37 is fixedly installed at the bottom of both extension plates 24. The air tightness tester 37 is used to test the air tightness of the weld. An inductive controller 28 is fixedly installed on one side of the outer wall of one of the extension plates 24. The inductive controller 28 is electrically connected to the air tightness tester 37. In this embodiment, the injection device 23 consists of a small storage tank and a micro pump. The injection tube 27 is used to replenish the penetration test liquid. During the weld formation process, the injection tube 18 drips the penetration test liquid onto the weld by activating the injection device 23. The airtightness detector 37 consists of an ultrasonic leak detector. Under the control of the inductive controller 28, the airtightness detector 37 performs a non-contact preliminary scan of the weld, realizing the integration of welding and preliminary inspection processes, which greatly improves the inspection efficiency.

[0027] In summary, this invention addresses the core requirements and shortcomings of existing technologies in pressure vessel circumferential welding, and constructs an integrated device that combines welding, protection, auxiliary operations, and quality inspection, effectively providing a more efficient and stable solution for pressure vessel circumferential welding.

[0028] Working principle: First, the two pressure tanks to be welded are hoisted onto the bearing platform drive wheels 10 above the welding frame 1. The tanks are initially positioned by the symmetrical distribution of multiple sets of drive wheels 10 on both sides of the welding frame 1. Then, before welding, the refractory cloth 29 is assembled. To facilitate the installation by the operator, the connecting shell 15, L-shaped rod 19, connecting block 20 and the double-sided arc frame 21 connected to it by the elastic clamping parts can be driven to move down as a whole, so that there is space between the double-sided arc frame 21 and the guide table 14. Then, the operator can insert both ends of the refractory cloth 29 into the two clamping shells 31 and tighten them by locking pins 32, so that the ends of the locking pins 32 tightly abut against the outer surface of the refractory cloth 29, and firmly fix the refractory cloth 29 in the clamping shell 31. The groove in the middle of the shell precisely avoids the welding torch 26, which does not interfere with the welding operation and can completely shield the perimeter of the welding area, forming a closed-loop protection. Then, the clamping shell 31 is placed inside the double-sided arc frame 21. At this time, the clamping rod 25 automatically pops out under the elastic force of the spring 30. When the clamping sleeve 35 of the clamping case 31 corresponds to the axis of the clamping rod 25, the spring 30 is released and quickly embedded into the inside of the clamping sleeve 35, thereby realizing the quick clamping of the clamping case 31 and thus completing the fixation of the fireproof cloth 29. After fixing, the welding operation is started. The lifting drive mechanism 5 inside the upright box 4 drives the slide 9 to adjust the height. Then, according to the weld position of the two pressure tanks, the multi-section hydraulic cylinder 6 drives the welding device 7 to slide horizontally along the outer wall of the guide frame 8, so that the welding gun 26 is aligned with the starting welding point of the circumferential weld of the tank body. Then, the initial welding is carried out at the welding point, so that the two pressure tanks can be easily rotated synchronously later. After the local connection point is welded, the pressure tanks can be temporarily fixed to prevent rotation and displacement. Then, the output shaft of the motor 12 drives the drive shaft 11 to rotate. The drive wheel 10 drives the pressure tank on it to rotate at a constant speed through friction, providing a continuous rotational basis for circumferential weld welding. During this process, the refractory cloth 29 is synchronously attached to the welding area of ​​the pressure tank along with the welding device 7, effectively blocking high-temperature arc radiation, molten metal splashes and hot welding slag, avoiding damage to equipment cables, hydraulic pipelines, the smooth surface of the container body and surrounding combustibles, and achieving precision protection. During this process, the height of the double-sided arc frame 21 and the refractory cloth 29 can be adjusted by the extension and retraction adjustment of the cylinder 16 according to the height of the arc splash, so as to better cover the arc sparks in the welding area. As the circumferential seam gradually forms, the injection device 23 on the support platform 22 works synchronously, continuously delivering a penetrant testing agent through the injection pipe 27 and spraying it into the welding area of ​​the welding torch 26 through the injection pipe 18. The airtightness detector 37 at the bottom of the extension plate 24 operates in real time under the control of the inductive controller 28, performing airtightness testing on the newly welded circumferential seam through a non-contact testing method. If a leak is detected in the weld, the inductive controller 28 immediately sends a signal to the control box 3, which can pause the welding operation, allowing operators to handle it in a timely manner and avoid the continuous generation of unqualified welds. This achieves online control of welding quality. This process does not require transferring the welding workpiece, greatly improving the timeliness of the test and the continuity of the process, and ensuring the welding quality of the pressure vessel.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A positioning device for circumferential welding of pressure vessels, comprising a welding frame (1), a vertical drive mechanism, a guide frame (8), refractory cloth (29), and a transmission mechanism, characterized in that: The welding frame (1) is driven by a transmission mechanism to rotate two pressure tanks. A stand (2) is fixedly installed at one end of the welding frame (1). The vertical drive mechanism is located above the stand (2). A slide (9) that moves up and down is provided outside the vertical drive mechanism. The guide frame (8) is fixedly installed on the outer wall of one side of the slide (9). A welding device (7) is connected to the outer wall of the slide (9) near the guide frame (8) through a multi-section hydraulic cylinder (6). A welding torch (26) is connected to the lower part of the welding device (7). The welding device (7) slides above the outside of the guide frame (8). Symmetrical welding torches are installed on both sides of the outer wall of the welding device (7). Support base (13), two support bases (13) are connected to guide platform (14) by support rods (17) installed at both ends of the bottom. A double-sided arc frame (21) is provided below the guide platform (14). The two support bases (13) are connected to the double-sided arc frame (21) by a top support mechanism. The double-sided arc frame (21) has a housing (31) for accommodating refractory cloth (29) connected to both ends of the inside by corresponding elastic clamping parts. The refractory cloth (29) is clamped by symmetrically installed locking parts inside the housing (31). The refractory cloth (29) is provided with a groove in the middle of the inside for easy welding by welding gun (26).

2. The pressure vessel circumferential weld positioning device according to claim 1, characterized in that: The vertical drive mechanism includes a vertical box (4) fixedly installed above the stand (2). The slide (9) is driven to move up and down by a lifting drive mechanism (5) inside the vertical box (4). A control box (3) is fixedly installed on one side of the outer wall of the vertical box (4) near the bottom.

3. The pressure vessel circumferential weld positioning device according to claim 1, characterized in that: The transmission mechanism includes bearing platforms symmetrically installed above the welding frame (1). Each bearing platform is equipped with a drive wheel (10). The multiple drive wheels (10) are connected by a through drive shaft (11). One end of one drive shaft (11) is fixedly installed with a motor (12). The bottom of the motor (12) is set on one side of the welding frame (1) by a fixed base.

4. The pressure vessel circumferential weld positioning device according to claim 1, characterized in that: The top support mechanism includes a cylinder (16) fixedly installed above the support base (13). A connecting shell (15) is fixedly installed at the telescopic end of the cylinder (16). L-shaped rods (19) are fixedly installed on both sides of the connecting shell (15). The lower ends of the two L-shaped rods (19) slide through the support base (13) and are connected to connectors (34) respectively. Connecting blocks (20) are fixedly installed on the side of the two connectors (34) that are close to each other.

5. A pressure vessel circumferential weld positioning device according to claim 4, characterized in that: The elastic clamping component includes clamping cylinders (35) fixedly installed on both sides of the outer wall of one end of the double-sided arc frame (21). Clamping rods (25) are slidably inserted into the lower part of the connecting block (20). A ring plate (36) is fixedly sleeved on the outside of one end of the clamping rod (25). A spring (30) is sleeved on the outside of the clamping rod (25) and on the side close to the ring plate (36). One end of the clamping rod (25) slides through the inside of the double-sided arc frame (21) and extends into the inside of the clamping cylinder (35) to clamp the clamping case (31) inside the double-sided arc frame (21).

6. The pressure vessel circumferential weld positioning device according to claim 1, characterized in that: The locking element includes a screw cylinder (33) that is installed through the upper part of the housing (31), and a locking pin (32) is threaded inside the screw cylinder (33), the end of which abuts against the outer surface of the fire-resistant cloth (29).

7. The pressure vessel circumferential weld positioning device according to claim 1, characterized in that: The outer surfaces of both ends of the double-sided arc frame (21) are provided with support platforms (22). The support platforms (22) are rectangular frames. Extension plates (24) extend from both sides of the outer wall of the support platform (22) and near the middle. The extension plates (24) and the support platforms (22) are integrally formed.

8. A pressure vessel circumferential weld positioning device according to claim 7, characterized in that: An injection device (23) is fixedly installed inside the upper part of the support platform (22). An injection tube (27) is connected to one side of the injection device (23). An injection tube (18) is connected to the lower end of the injection device (23). An air tightness tester (37) is fixedly installed at the bottom of both extension plates (24). The air tightness tester (37) is used to test the air tightness of the weld. An inductive controller (28) is fixedly installed on one side of the outer wall of one of the extension plates (24). The inductive controller (28) is electrically connected to the air tightness tester (37).

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