A thick-walled stainless steel ring slit narrow gap submerged arc welding device

Abstract

The application discloses a thick-wall stainless steel ring slit narrow-gap submerged-arc welding device and belongs to the technical field of welding, which comprises a welding support, a deformation support mechanism arranged in the welding support and an offset detection mechanism arranged in the middle of the welding support. In the application, the deformation support device is arranged, so that the deformation in the welding process can be effectively controlled when the thick-wall stainless steel ring body is welded, thereby ensuring the welding quality. Two electric push rods II can be simultaneously started by a user to drive two mounting plates to move and place the mounting plates outside the thick-wall stainless steel ring body. At this time, the user starts two servo motors, the servo motors drive two transmission plates to rotate, the limiting grooves on the inner sides of the transmission plates extrude the limiting columns to move, the support expands the support plates in the moving process, the user can observe the pressure sensors on the inner sides of the support plates, and then the user can stop the servo motors. The process ensures that the support forces are uniformly distributed in the welding process.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, and in particular relates to a device for narrow-gap submerged arc welding of thick-walled stainless steel circumferential seams. Background Technology

[0002] Thick-walled stainless steel is widely used in many industrial fields, such as petrochemicals, marine engineering, and nuclear power plants. Due to its strong corrosion resistance and high strength, it is particularly suitable for high-temperature, high-pressure, and highly corrosive environments. However, the welding technology of thick-walled stainless steel has always been a major challenge in manufacturing and engineering applications.

[0003] The prior art discloses an invention patent with application number CN108544056B, which discloses a follow-up sliding narrow gap submerged arc welding device. Its basic description is as follows: it includes a cylinder, with a support plate located at the rear side of the cylinder. A base plate is provided at the lower end of the support plate, and a welding torch is located at the lower center of the cylinder. A slider rests against the inner wall of the weld. Under the action of an elastic element, two telescopic cylinders separate to ensure sufficient pressure, thereby causing the slider to press the weld tightly. The welding torch is positioned directly in front of the center of the weld. Here, the telescopic cylinders are equipped with racks, and the two racks are connected by gears. When encountering a protrusion, the slider on the protruding side is squeezed and moves inward, driving the rack to move. The rack drives the gear, which in turn drives the other rack. In this way, the two sliders retract synchronously, ensuring that the welding torch is always between the two sliders, thus ensuring that the welding torch is directly in front of the center of the weld and guaranteeing welding quality. This method relies on mechanical transmission, avoiding intelligent components, resulting in higher reliability, greater accuracy, and improved welding quality.

[0004] However, some problems still exist in its use: During the welding of thick-walled stainless steel rings, thermal expansion and contraction caused by high temperatures can easily lead to deformations such as bending, warping, or stretching in the weld joint area. Traditional welding methods often cannot effectively control deformation during the welding process, resulting in unstable weld quality and even reduced strength of the weld joint.

[0005] During welding, poor alignment or inconsistent height of the thick-walled stainless steel ring body can lead to welding deviations. Traditional welding methods lack precise detection and early warning mechanisms during the alignment process, resulting in welding deviations not being detected and corrected in a timely manner.

[0006] Based on this, the present invention designs a submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to solve the problem that traditional welding is difficult to control deformation and butt joint deviation, which affects welding quality and joint strength, and to propose a submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel includes a welding bracket, wherein a deformation support mechanism is provided inside the welding bracket, and an offset detection mechanism is provided in the middle of the welding bracket. A deformable support mechanism includes a guide rail, a support, a connecting plate, a preload spring, a top plate, and a support plate. The inner wall of the guide rail is slidably connected to the support, one end of the support is fixedly connected to the support plate, and the outer wall of the support is fixedly connected to the connecting plate. An offset detection mechanism includes a detection plate, a compression spring, a trigger plate, a support plate, and a connector. The bottom ends of the two detection plates are fixedly connected to the compression springs, and the bottom ends of the two detection plates are fixedly connected to the support plates. The middle of the connector is rotatably connected to the trigger plate, and the two ends of the trigger plate are respectively placed inside the two support plates.

[0009] As a further description of the above technical solution: The top two sides of the welding bracket are respectively connected to a drive motor one and a drive motor two. The output ends of the drive motor one and the drive motor two are fixedly connected to an electric push rod one. The free ends of the two electric push rods one are fixedly connected to clamps. The inner sides of the two clamps are fixedly connected to electric push rods two.

[0010] As a further description of the above technical solution: The free ends of the two electric push rods are fixedly connected to mounting plates, the welding device body is connected to the middle of the welding bracket, and two thick-walled stainless steel ring bodies overlap the middle of the welding bracket.

[0011] As a further description of the above technical solution: A servo motor is fixedly connected to the inner side of each of the two mounting plates. A transmission plate is fixedly connected to the output end of each of the two servo motors. The outer sides of each of the two transmission plates are rotatably connected to two guide rails. A limit sleeve is fixedly connected to the inner side of each of the two mounting plates. One end of each of the two limit sleeves is rotatably connected to the transmission plate. A fixing rod is fixedly connected to the outer wall of each of the two limit sleeves. The two fixing rods are fixedly connected to the outer wall of each of the two guide rails.

[0012] As a further description of the above technical solution: Both transmission plates have limit grooves on their outer walls, and limit posts are connected to the inner walls of both limit grooves. The two limit posts are rotatably connected to the outer sides of the two supports. Reinforcing ribs are fixedly connected to the outer sides of the supports, and the reinforcing ribs are fixedly connected to the support plates. Pressure sensors are embedded in the outer sides of the support plates.

[0013] As a further description of the above technical solution: Extension plates are fixedly connected to both sides of the two connecting plates, and preload springs are fixedly connected to the top of the connecting plates and the top of the extension plates. A top plate is fixedly connected to the top of the preload springs.

[0014] As a further description of the above technical solution: A grinding plate is engaged at the top of the top plate, and the support plate is attached to the inner wall of the thick-walled stainless steel ring body.

[0015] As a further description of the above technical solution: The two detection plates are provided with detection rings on their exteriors. The bottom ends of the detection rings are fixedly connected to two support legs, and both support legs are fixedly connected to the middle of the welding bracket.

[0016] As a further description of the above technical solution: The inner wall of the detection ring is fixedly connected to a fixed base, and the bottom ends of the two compression springs are fixedly connected to the top end of the fixed base.

[0017] As a further description of the above technical solution: The bottom end of the connector is fixedly connected to one side of the top of the fixed base. Both sides of the bottom end of the trigger plate are fixedly connected to trigger rods. The inner sides of the two bearing plates are connected to trigger switches. The trigger ends of the two trigger switches are respectively placed at the bottom of the two trigger rods. The bottom end of the trigger plate is fixedly connected to a support spring. The bottom ends of the two support springs are fixedly connected to the top of the fixed base. The top of the detection ring is fixedly connected to an audible and visual alarm. Both trigger switches are electrically connected to the audible and visual alarm.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, the deformation support device effectively controls the deformation during the welding process of the thick-walled stainless steel ring body, thereby ensuring the welding quality. The user can simultaneously activate two electric push rods to drive the two mounting plates to move and place the mounting plates outside the thick-walled stainless steel ring body. At this time, the user activates two servo motors, which drive the two transmission plates to rotate, thereby causing the limiting grooves on the inner side of the transmission plates to squeeze the limiting posts to move, and causing the support to expand the support plate during the movement. The user can observe the pressure sensor on the inner side of the support plate. Then the user can stop the servo motors. This process ensures that the support force is evenly distributed during the welding process, avoids expansion of the welding area, and reduces the bending, warping, or tensile deformation of the weld joint area caused by the rapid drop in temperature and the cooling and contraction of the material.

[0019] 2. In this invention, when the weld joint needs to be ground, the user starts drive motor one and drive motor two. Electric push rod one will drive the clamp to rotate, and rotate one end of the thick-walled stainless steel ring body against the inner side of the grinding plate. This ensures that the surface of the weld joint is ground evenly, improves the surface cleanliness before welding, and avoids poor welding. After grinding and cleaning, the user can start electric push rod two and servo motor again to place the support plate inside the thick-walled stainless steel ring body. Then, the output end of the motor drives the drive plate to rotate, so that the support plate drives the support plate to fit against the inner wall of the ring body, ensuring that the inner wall of the thick-walled stainless steel ring body is well supported during welding, preventing poor welding results caused by internal stress. By observing the pressure sensor inside the support plate, the user can monitor the pressure in real time to ensure that the pressure is appropriate during the welding process. Finally, the user can stop the servo motor and start the welding device body to weld the joint. This series of operations not only effectively prevents welding deformation, but also improves the strength and uniformity of the weld joint, thereby improving the efficiency and quality of the entire welding process.

[0020] 3. In this invention, through the offset detection mechanism, when the user assembles two thick-walled stainless steel ring bodies, the user can start drive motor one and drive motor two to rotate the two thick-walled stainless steel ring bodies respectively. During the rotation, two compression springs can respectively drive two detection plates to fit against the outer side of the ring body. If the heights of the two thick-walled stainless steel ring bodies are inconsistent, one of the detection plates will drive the support plate to move. During the movement of the support plate, it will further drive the trigger plate to move. The trigger plate rotates through the outer side of the connector, and the trigger rod at the bottom of the trigger plate presses the trigger switch. The trigger switch then activates the audible and visual alarm to issue a timely warning. This offset detection mechanism effectively prevents welding deviations caused by poor assembly of the thick-walled stainless steel ring bodies, ensures the height consistency during the assembly process, improves the accuracy and stability of the welded joint, and the timely audible and visual alarm helps the operator to find and correct problems before welding, avoiding subsequent welding defects caused by offset, thereby significantly improving production efficiency and product quality. Attached Figure Description

[0021] Figure 1 This is a front view of a submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel proposed in this invention. Figure 2 This is a schematic diagram of the bottom structure of a thick-walled stainless steel circumferential narrow gap submerged arc welding device proposed in this invention; Figure 3 This is a structural cross-sectional view of the thick-walled stainless steel ring body portion of a thick-walled stainless steel circumferential narrow-gap submerged arc welding device proposed in this invention. Figure 4 This invention proposes a submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel. Figure 3 Enlarged view of point A in the middle; Figure 5 This is an exploded view of the limiting sleeve portion of a thick-walled stainless steel circumferential narrow gap submerged arc welding device proposed in this invention. Figure 6 This invention proposes a submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel. Figure 5 Enlarged view at point B in the middle; Figure 7 This is a schematic diagram of the detection ring portion of a thick-walled stainless steel circumferential narrow gap submerged arc welding device proposed in this invention. Figure 8 This is a schematic diagram of the detection plate portion of a thick-walled stainless steel circumferential narrow-gap submerged arc welding device proposed in this invention. Figure 9 This invention proposes a submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel. Figure 8 Enlarged view of point C.

[0022] Legend: 1. Drive motor one; 2. Welding bracket; 3. Welding device body; 4. Deformation support mechanism; 401. Electric push rod one; 402. Clamp; 403. Electric push rod two; 404. Mounting plate; 405. Connecting plate; 406. Guide rail; 407. Top plate; 408. Reinforcing rib; 409. Support; 410. Extension plate; 411. Preload spring; 412. Servo motor; 413. Limiting sleeve; 414. Grinding plate; 415. Support plate; 416. Limiting groove 417. Transmission plate; 418. Limiting post; 419. Fixing rod; 420. Pressure sensor; 5. Thick-walled stainless steel ring body; 6. Offset detection mechanism; 601. Support leg; 602. Detection ring; 603. Audible and visual alarm; 604. Detection plate; 605. Fixing base; 606. Compression spring; 607. Trigger plate; 608. Support spring; 609. Bearing plate; 610. Trigger rod; 611. Trigger switch; 612. Connecting piece; 7. Transmission motor II. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1-9 The present invention provides a technical solution: a submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel, including a welding bracket 2, a deformation support mechanism 4 inside the welding bracket 2, and an offset detection mechanism 6 in the middle of the welding bracket 2. The deformable support mechanism 4 includes a guide rail 406, a support 409, a connecting plate 405, a preload spring 411, a top plate 407, and a support plate 415. The inner wall of the guide rail 406 is slidably connected to the support 409, one end of the support 409 is fixedly connected to the support plate 415, and the outer wall of the support 409 is fixedly connected to the connecting plate 405. The offset detection mechanism 6 includes a detection plate 604, a compression spring 606, a trigger plate 607, a support plate 609, and a connector 612. The bottom ends of the two detection plates 604 are fixedly connected to the compression spring 606, and the bottom ends of the two detection plates 604 are fixedly connected to the support plate 609. The trigger plate 607 is rotatably connected to the middle of the connector 612, and the two ends of the trigger plate 607 are respectively placed inside the two support plates 609.

[0025] Specifically, such as Figures 1-3 As shown, drive motor 1 and drive motor 7 are respectively connected to the top two sides of the welding bracket 2. Electric push rod 401 is fixedly connected to the output end of drive motor 1 and the output end of drive motor 7. Clamps 402 are fixedly connected to the free ends of the two electric push rods 401. Electric push rod 403 is fixedly connected to the inner side of the two clamps 402.

[0026] In the aforementioned components, the clamp 402 can hold the thick-walled stainless steel ring body 5, and the electric push rod 401 can further provide adjustment force, allowing the clamp 402 to adjust the clamping force as needed, ensuring that the two thick-walled stainless steel ring bodies 5 can be firmly joined together during the welding process, avoiding displacement or uneven joints due to insecure clamping. Specifically, such as Figures 1-3 As shown, the free ends of the two electric push rods 403 are fixedly connected to the mounting plates 404, the welding bracket 2 is connected to the welding device body 3 in the middle, and the welding bracket 2 has two thick-walled stainless steel ring bodies 5 overlapping in the middle.

[0027] Specifically, such as Figures 3-6 As shown, servo motors 412 are fixedly connected to the inner sides of the two mounting plates 404, and transmission plates 417 are fixedly connected to the output ends of the two servo motors 412. The outer sides of the two transmission plates 417 are rotatably connected to the two guide rails 406 respectively. Limiting sleeves 413 are fixedly connected to the inner sides of the two mounting plates 404. One end of the two limiting sleeves 413 is rotatably connected to the transmission plate 417 respectively. Fixing rods 419 are fixedly connected to the outer walls of the two limiting sleeves 413 respectively. The two fixing rods 419 are fixedly connected to the outer walls of the two guide rails 406 respectively.

[0028] In the aforementioned components, the connection of the limiting sleeve 413 ensures that the transmission plate 417 is effectively restricted during movement, preventing excessive movement or deviation from the track. The transmission plate 417 is made of high-strength alloy material, possessing good wear resistance and high load capacity. The fixed rod 419 provides support and limitation for the guide rail 406. Specifically, such as Figures 3-6 As shown, the outer walls of the two transmission plates 417 are provided with limit grooves 416, and the inner walls of the two limit grooves 416 are connected to limit posts 418. The two limit posts 418 are rotatably connected to the outer sides of the two supports 409 respectively. The outer sides of the supports 409 are fixedly connected with reinforcing ribs 408, and the reinforcing ribs 408 are fixedly connected to the support plate 415. The outer side of the support plate 415 is embedded with a pressure sensor 420.

[0029] In the above components, the reinforcing rib 408 can enhance the support effect of the support plate 415 and avoid insufficient support force of the support plate 415. In addition, the limiting post 418 can drive the support 409 to move during the movement of the limiting groove 416. The support 409 can slide along the guide rail 406, thereby driving the support plate 415 to fit against the inner wall of the thick-walled stainless steel ring body 5, avoiding displacement during the welding process. In addition, the pressure sensor 420 can help the user to judge whether the support plate 415 is completely fitted against the inner wall of the thick-walled stainless steel ring body 5.

[0030] Specifically, such as Figures 3-6 As shown, extension plates 410 are fixedly connected to both sides of the two connecting plates 405, and preload springs 411 are fixedly connected to the top of the connecting plates 405 and the top of the extension plates 410. A top plate 407 is fixedly connected to the top of the preload springs 411.

[0031] In the above components, the extension plate 410 can make the top plate 407 bear the force evenly and prevent the top plate 407 from tilting.

[0032] Specifically, such as Figures 3-6 As shown, a grinding plate 414 is engaged with the top of the top plate 407, and a support plate 415 is attached to the inner wall of the thick-walled stainless steel ring body 5.

[0033] Specifically, such as Figures 1-2 and Figures 6-9 As shown, two detection plates 604 are provided with detection rings 602 on their outer sides. Two support legs 601 are fixedly connected to the bottom end of the detection rings 602. Both support legs 601 are fixedly connected to the middle of the welding bracket 2.

[0034] Specifically, such as Figures 1-2 and Figures 6-9 As shown, a fixed base 605 is fixedly connected to the inner wall of the detection ring 602, and the bottom ends of the two compression springs 606 are fixedly connected to the top end of the fixed base 605.

[0035] Specifically, such as Figures 1-2 and Figures 6-9 As shown, the bottom end of the connector 612 is fixedly connected to one side of the top of the fixed base 605. Both sides of the bottom end of the trigger plate 607 are fixedly connected to trigger rods 610. The inner sides of the two bearing plates 609 are connected to trigger switches 611. The trigger ends of the two trigger switches 611 are respectively placed at the bottom of the two trigger rods 610. The bottom end of the trigger plate 607 is fixedly connected to a support spring 608. The bottom ends of the two support springs 608 are fixedly connected to the top of the fixed base 605. The top of the detection ring 602 is fixedly connected to an audible and visual alarm 603. Both trigger switches 611 are electrically connected to the audible and visual alarm 603.

[0036] Among the aforementioned components, the audible and visual alarm 603 is specifically model VBS-26A. The two support springs 608 can drive the trigger plate 607 to reset, and the bottom of the trigger rod 610 completes the transmission of the alarm signal by contacting the trigger end of the trigger switch 611.

[0037] Working principle and usage: When welding thick-walled stainless steel ring bodies 5, it can effectively control deformation during the welding process, thereby ensuring welding quality. First, the user places two thick-walled stainless steel ring bodies 5 on top of the welding bracket 2. Then, the user activates two electric push rods 401, which drive the clamp 402 to bring the two thick-walled stainless steel ring bodies 5 closer together. This design ensures precise alignment of the butt joints of the thick-walled stainless steel ring bodies 5 during welding, reducing uneven joints caused by misalignment of the thick-walled stainless steel ring bodies 5. Next, the user can simultaneously activate two electric push rods 403 to drive the two mounting plates 404 to move and place the mounting plates 404 outside the thick-walled stainless steel ring bodies 5. The user activates two servo motors 412, which drive two transmission plates 417 to rotate. This causes the limiting grooves 416 inside the transmission plates 417 to press and move the limiting posts 418, thus expanding the support plate 415 during the movement of the support 409. The user can observe the pressure sensor 420 inside the support plate 415. The user can then stop the servo motors 412. This process ensures that the support force is evenly distributed during welding, avoids expansion of the welding area, and reduces the bending, warping, or tensile deformation of the weld joint area caused by the rapid drop in temperature and the cooling and contraction of the material. When the weld joint needs to be ground, the user activates transmission motor 1 and transmission motor 2. The electric push rod 401 drives the clamp 402 to rotate, thus removing the thick... One end of the thick-walled stainless steel ring body 5 is rotated against the inner side of the grinding plate 414. This ensures that the surface of the weld joint is uniformly ground, improves the surface cleanliness before welding, and avoids poor welding. After grinding and cleaning, the user can restart the electric push rod 403 and the servo motor 412 to place the support plate 415 inside the thick-walled stainless steel ring body 5. Then, the output end of the motor drives the transmission plate 417 to rotate, causing the support plate 415 to be in contact with the inner wall of the ring body by the support 409. This ensures that the inner wall of the thick-walled stainless steel ring body 5 is well supported during welding, preventing poor welding results caused by internal stress. By observing the pressure sensor 420 inside the support plate 415, the user can monitor the pressure in real time to ensure that the pressure is appropriate during the welding process. Finally, the user can stop the servo motor 412 and start the welding device body 3 to weld the joint. This series of operations not only effectively prevents welding deformation but also improves the strength and uniformity of the weld joint, thereby improving the efficiency and quality of the entire welding process. When the user connects the two thick-walled stainless steel ring bodies 5, the user can start the drive motor 1 and drive motor 7 to drive the two thick-walled stainless steel ring bodies 5 to rotate respectively. During the rotation, the two compression springs 606 can drive the two detection plates 604 to fit against the outer side of the ring body. If the heights of the two thick-walled stainless steel ring bodies 5 are not consistent, one of the detection plates 604 will drive the bearing plate 609 to move. During the movement, the bearing plate 609 will further drive the trigger plate 607 to move.The trigger plate 607 rotates via the outer side of the connector 612, and the trigger rod 610 at the bottom of the trigger plate 607 presses the trigger switch 611. The trigger switch 611 then activates the audible and visual alarm 603, providing timely warning. This offset detection mechanism effectively prevents welding deviations caused by poor mating of the thick-walled stainless steel ring body 5, ensuring high consistency during the mating process, improving the precision and stability of the welded joint. Timely audible and visual alarms help operators identify and correct problems before welding, avoiding subsequent welding defects caused by offset, thereby significantly improving production efficiency and product quality.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel, comprising a welding support, characterized in that, The welding bracket is equipped with a deformation support mechanism inside, and an offset detection mechanism is provided in the middle of the welding bracket; A deformable support mechanism includes a guide rail, a support, a connecting plate, a preload spring, a top plate, and a support plate. The inner wall of the guide rail is slidably connected to the support, one end of the support is fixedly connected to the support plate, and the outer wall of the support is fixedly connected to the connecting plate. An offset detection mechanism includes a detection plate, a compression spring, a trigger plate, a support plate, and a connector. The bottom ends of the two detection plates are fixedly connected to the compression springs, and the bottom ends of the detection plates are fixedly connected to the support plates. The middle of the connector is rotatably connected to the trigger plate, and the two ends of the trigger plate are respectively placed inside the corresponding support plates. The top two sides of the welding bracket are respectively connected to a drive motor one and a drive motor two. The output ends of the drive motor one and the output ends of the drive motor two are fixedly connected to an electric push rod one. The free ends of the electric push rod one are fixedly connected to a clamp, and the inner side of the clamp is fixedly connected to an electric push rod two. The free ends of the two electric push rods are fixedly connected to mounting plates, the welding device body is connected to the middle of the welding bracket, and a thick-walled stainless steel ring body overlaps the middle of the welding bracket. A servo motor is fixedly connected to the inner side of each of the two mounting plates. A transmission plate is fixedly connected to the output end of each servo motor. The outer side of each transmission plate is rotatably connected to the corresponding guide rail. A limit sleeve is fixedly connected to the inner side of each of the two mounting plates. One end of each limit sleeve is rotatably connected to the corresponding transmission plate. The output end of the servo motor drives the transmission plate to rotate, so that the support plate drives the support plate to fit against the inner wall of the ring body. The two detection plates are provided with detection rings on their exteriors. The bottom of each detection ring is fixedly connected to two support legs, and each support leg is fixedly connected to the middle of the welding bracket. The inner wall of the detection ring is fixedly connected to a fixed base, and the bottom ends of the two compression springs are fixedly connected to the top end of the fixed base. The bottom end of the connector is fixedly connected to one side of the top of the fixed base. Both sides of the bottom end of the trigger plate are fixedly connected to trigger rods. The inner sides of the two bearing plates are connected to trigger switches. The trigger ends of the trigger switches are respectively placed at the bottom of the corresponding trigger rods. The bottom end of the trigger plate is fixedly connected to a support spring. The bottom ends of the two support springs are fixedly connected to the top of the fixed base. The top of the detection ring is fixedly connected to an audible and visual alarm. The trigger switches are all electrically connected to the audible and visual alarm.

2. The submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel as described in claim 1, characterized in that, Both of the limiting sleeves are fixedly connected to the outer walls of the sleeves with fixing rods, and the fixing rods are respectively fixedly connected to the outer walls of the corresponding guide rails.

3. The submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel according to claim 2, characterized in that, Both transmission plates have limit grooves on their outer walls, and limit posts are connected to the inner walls of the limit grooves. The limit posts are rotatably connected to the outer side of the corresponding supports. Reinforcing ribs are fixedly connected to the outer side of the supports, and the reinforcing ribs are fixedly connected to the support plates. Pressure sensors are embedded in the outer side of the support plates.

4. The submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel as described in claim 3, characterized in that, Extension plates are fixedly connected to both sides of the connecting plate, and preload springs are fixedly connected to the top of both the connecting plate and the extension plates. A top plate is fixedly connected to the top of each preload spring.

5. The submerged arc welding device for narrow gap circumferential welds of thick-walled stainless steel according to claim 4, characterized in that, A grinding plate is engaged at the top of the top plate, and the support plate is attached to the inner wall of the thick-walled stainless steel ring body.

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