Small-wall-thickness corrosion-resistant blind plate welding tool

Abstract

The invention belongs to the technical field of blind plate welding, and particularly relates to a small-wall-thickness corrosion-resistant blind plate welding tool which comprises a frame body, a plurality of supporting plates are arranged in the frame body, and each supporting plate is slidably connected with a positioning block; a switching assembly is arranged at the position, corresponding to each positioning block, in the frame body, the switching assembly comprises a rotating ring rotationally arranged above the frame body, a conical block is fixedly connected to the circumferential surface of the rotating ring, a supporting frame is fixedly connected to the interior of the frame body, and a first rack plate is slidably connected to the top end of the supporting frame; one end of the first rack plate is fixedly connected with a convex plate, the other end of the first rack plate is fixedly connected with a connecting plate, the connecting plate is fixedly connected with the positioning block, and the switching assembly and the protection assembly are arranged, so that the problem that a thin plate is deformed due to the high temperature of the welding gun is solved, and meanwhile, the problem that the thin plate misplaces possibly is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of blind plate welding, in particular to a welding tool for a small-wall-thickness corrosion-resistant blind plate. Background Art

[0002] Pipeline type structural products are widely used in chemical, oil and gas, coal mining, construction and other industries. Raw materials are often used for surfacing welding to extend their service life. Production work is usually carried out through welding blind plate auxiliary equipment.

[0003] In the existing blind plate cladding process, the blind plate to be welded is first placed on the workbench, and then the worker uses a handheld welding gun to weld the circular abutment between the blind plate and the base plate. During the welding process, after the blind plate and the base plate are aligned, the alignment tool is removed, and then circumferential welding is performed to make the welding wire melt evenly and fill the weld.

[0004] When performing existing cladding work, high temperature will be generated during the welding process of the welding gun. The thin plate may be deformed under the influence of high temperature, causing the cladding to fail, and the welded blind plate cannot be put into work, resulting in poor production quality. At the same time, the production efficiency cannot be improved. In addition, during the welding process, the thin plate is not effectively fixed. After the centering is completed, there will be a certain gas (rare gas) impact force during the welding process of the welding gun, which may cause a certain misalignment of the thin plate, and then cause the problem of misalignment of the subsequent welding position.

[0005] To this end, the present invention provides a small-wall-thickness corrosion-resistant blind plate welding tool. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: the small-wall-thickness corrosion-resistant blind plate welding tool of the present invention comprises a frame, a plurality of support plates are arranged inside the frame, and a positioning block is slidably connected to each support plate; A switching assembly is provided at a position corresponding to each positioning block in the frame, and the switching assembly includes a rotating ring rotatably arranged above the frame, a cone block is fixedly connected to the rotating circumferential surface, a support frame is fixedly connected to the inside of the frame, a first rack plate is slidably connected to the top of the support frame, a convex plate is fixedly connected to one end of the first rack plate, a connecting plate is fixedly connected to the other end of the first rack plate, and the connecting plate is fixedly connected to the positioning block; The first rack plate is drivingly connected to a protection component, which is used to protect the weld after welding and limit the thin plate. The protection component includes an arc-shaped protection ring slidably arranged above the positioning block.

[0008] Preferably, a limiting ring is fixedly connected to the inner wall of the rotating ring, and one end of the limiting ring is rotatably connected to an auxiliary ring for limiting the position of the welding gun.

[0009] Preferably, when the cone block on the circumferential surface of the rotating ring abuts against the convex plate at one end of the first rack plate and performs extrusion work, the cone block pushes the convex plate to move, and the convex plate drives the first rack plate to slide. The sliding of the first rack plate drives one of the positioning blocks to detach from the thin plate, and the rotating ring drives the welding gun to perform welding work, that is, after the positioning block detaches, the welding gun starts welding, and when the welding completes the same arc length as the arc protection ring, the arc protection ring of the protective assembly moves to the position where the welding is completed, and the arc protection ring covers the weld, and the cone block continues to move and detaches from the convex plate.

[0010] Preferably, the protective component includes a rotating shaft rotatably arranged inside the wide body, a first gear is fixedly connected to the top of the rotating shaft, a second gear is fixedly connected to the middle of the rotating shaft, a second gear is meshed with a second rack plate, a positioning frame is fixedly connected to the position of the frame corresponding to the second rack plate, the second rack plate is slidably arranged on one side of the positioning frame, one end of the second rack plate is fixedly connected to a limiting frame, a sliding groove is opened in the limiting frame, an auxiliary plate is slidably connected in the sliding groove, a compression spring is fixedly connected to the upper surface of the auxiliary plate, the compression spring is fixedly connected to the limiting frame, and the bottom end of the auxiliary plate is fixedly connected to the arc-shaped protective ring.

[0011] Preferably, a fixed cavity is opened inside the arc-shaped protection ring, and the fixed cavity is used to cover the weld without directly contacting the weld.

[0012] Preferably, before the cone block and the convex plate are about to separate, the arc protection ring moves to the weld. At this time, the arc protection ring is located directly above the weld. Under the elastic force of the compression spring, the arc protection ring is driven to slide along the sliding groove, and then abuts against the arc surface of the thin plate to limit the position, while covering the weld.

[0013] Preferably, a cooling assembly is provided on the upper surface of the auxiliary plate, and the cooling assembly includes a positioning box fixedly connected to the upper surface of the limit frame, and a blower is provided on the upper surface of the positioning frame. When the arc-shaped protection ring elastically moves downward to protect the weld, the auxiliary plate moves downward to connect the fixed cavity with the positioning box, that is, the cold air from the blower can enter the fixed cavity to cool the weld.

[0014] Preferably, the cooling assembly includes a first telescopic tube fixedly connected to one side of the blower, the first telescopic tube is fixedly connected to a positioning box, a connecting hole is provided in the positioning box, a second telescopic tube and a partition are fixedly connected to the upper surface of the auxiliary plate, the partition is inserted in the positioning box, and a positioning hole is provided on the surface of the partition.

[0015] Preferably, when the arc-shaped protective ring moves downward, it drives the second telescopic tube to expand and contract, and at the same time drives the partition plate to move downward, so that the positioning hole communicates with the connection hole, and then the cold air blown by the blower enters the fixed cavity to cool the weld seam.

[0016] Preferably, the switching components are distributed in a circumferential array on the circumference of the blind plate, and the arc-shaped protective rings are switched one by one to protect the welded weld seams, and at the same time, the thin plate is always limited.

[0017] The beneficial effects of the present invention are as follows: 1. For the small-wall-thickness corrosion-resistant blind plate welding tooling of the present invention, the rotation of the welding torch drives the rotation of the rotating ring, and the conical block fixedly connected to its circumferential surface rotates accordingly. As the conical block rotates, it contacts the convex plate at one end of the first rack plate and generates a thrust, pushing the first rack plate to slide on the top of the support frame. Since the other end of the first rack plate is fixedly connected to the positioning block through the connecting plate, the positioning block will slide on the support plate, realizing the separation of the limited thin plate. After separating from the thin plate, the welding torch performs welding work along the circumference of the thin plate. When the arc length equal to that of the arc-shaped protective ring is welded, at this time, the arc-shaped protective ring of the protection component moves to the welded position, and the arc-shaped protective ring covers the weld seam. The conical block continues to move and separates from the convex plate. At the same time, the sliding of the first rack plate will drive the connected protection component. The arc-shaped protective ring in the protection component is slidably arranged above the positioning block. Driven by the transmission of the first rack plate, the arc-shaped protective ring moves to the weld seam position to protect the welded weld seam from being damaged by the water in the external frame body. Moreover, the arc-shaped protective ring can also limit the thin plate to prevent the thin plate from shifting during the welding process, ensuring the welding accuracy and quality. Then, the convex plate is pushed in turn to protect the weld seam while keeping the thin plate limited, effectively improving the welding quality and product stability.

[0018] 2. For the small-wall-thickness corrosion-resistant blind plate welding tooling of the present invention, it is conveyed into the positioning box through the first telescopic tube. As the fixed cavity communicates with the positioning box, the cold air enters the fixed cavity through the second telescopic tube, thereby cooling the weld seam in the fixed cavity. On the one hand, it can cool the weld seam in time while the arc-shaped protective ring protects the weld seam, effectively avoiding quality problems caused by high-temperature residues in the weld seam and improving the welding quality. On the other hand, the movement of the auxiliary plate drives the change of the partition plate position, realizing the precise delivery of cold air. The structure is simple, the operation is convenient, no additional complex control device is required, the equipment cost and maintenance difficulty are reduced, and the efficiency and stability of the whole welding process are improved. Description of the Drawings

[0019] The present invention will be further described below with reference to the drawings.

[0020] Figure 1 is the three-dimensional view of the first embodiment of the present invention; Figure 2 is a schematic structural view of the frame of the present invention; Figure 3 is a schematic structural view of the switching component of the present invention; Figure 4 is a schematic structural view of the relationship between the second gear and the first gear of the present invention; Figure 5 is a schematic structural view of the cooling component of the present invention; Figure 6 is a sectional view of the cooling component of the present invention.

[0021] In the figure: 1. Frame; 2. Support plate; 21. Positioning block; 3. Rotating ring; 31. Taper block; 32. Limiting ring; 33. Auxiliary ring; 4. Support frame; 41. First rack plate; 42. Convex plate; 43. Connecting plate; 44. First gear; 45. Rotating shaft; 46. Second gear; 47. Second rack plate; 48. Positioning frame; 49. Limiting frame; 410. Arc protection ring; 411. Fixed cavity; 412. Blower; 413. First telescopic tube; 414. Positioning box; 415. Partition board; 416. Positioning hole; 417. Connecting hole; 418. Second telescopic tube; 419. Auxiliary plate; 420. Compression spring; 421. Sliding groove. Specific embodiments

[0022] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0023] Example 1: As Figures 1 to 6 shown, a small-wall-thickness corrosion-resistant blind plate welding tooling according to an embodiment of the present invention includes a frame 1. A plurality of support plates 2 are arranged inside the frame 1. A positioning block 21 is slidably connected to each support plate 2; a switching component is arranged at a position corresponding to each positioning block 21 inside the frame 1. The switching component includes a rotating ring 3 rotatably arranged above the frame 1. A taper block 31 is fixedly connected to the rotating circumferential surface. A support frame 4 is fixedly connected inside the frame 1. A first rack plate 41 is slidably connected to the top end of the support frame 4. A convex plate 42 is fixedly connected to one end of the first rack plate 41. A connecting plate 43 is fixedly connected to the other end of the first rack plate 41. The connecting plate 43 is fixedly connected to the positioning block 21; the first rack plate 41 is drivingly connected to a protection component. The protection component is used for protecting the weld seam after welding and limiting the thin plate at the same time. The protection component includes an arc protection ring 410 slidably arranged above the positioning block 21.

[0024] Specifically, during the existing surfacing work, when the welding torch is performing welding work, high temperature will be generated. Under the influence of high temperature, the thin plate may be deformed, resulting in surfacing failure. Moreover, the welded blind plate cannot be put into work, thus causing problems of poor production quality. At the same time, the production efficiency cannot be improved. In addition, during the welding process, the thin plate is not effectively fixed. After centering is completed, during the welding process of the welding torch, there will be a certain impact force of gas (rare gas), which may cause the thin plate to be displaced to a certain extent, and then cause the problem of misalignment of the subsequent welding position; Therefore, the present invention solves the above problems by setting corresponding structures. First, before welding work is carried out, the welding torch is abutted against the rotating ring 3, and the rotating ring 3 is temporarily fixed to the welding torch. Then, through the rotation of the welding torch, the rotating ring 3 is driven to rotate. The conical block 31 fixedly connected to its circumferential surface rotates accordingly. As the conical block 31 rotates, it contacts the convex plate 42 at one end of the first rack plate 41 and generates a thrust, pushing the first rack plate 41 to slide on the top of the support frame 4. Since the other end of the first rack plate 41 is fixedly connected to the positioning block 21 through the connecting plate 43, the positioning block 21 will slide on the support plate 2, realizing the thin plate that is released from the limit. After the thin plate is released, the welding torch performs welding work along the circumference of the thin plate. In addition, during the welding process, water is stored in the box on one side of the frame body 1. The water flows into the inside of the frame body 1 through the water inlet pipe. Then, during the welding process, the water in the frame body 1 contacts the bottom plate, thereby cooling the welding of the thin plate. And when the water flows into the frame body 1, the water in the frame body 1 also flows out from the water outlet pipe, so that the water is continuously circulated, avoiding the overall temperature rise of the water in the frame body 1 during the long-term welding process, resulting in a reduction in the cooling effect; When the arc length same as that of the arc-shaped protection ring 410 is welded, at this time, the arc-shaped protection ring 410 of the protection component moves to the welded position, and the arc-shaped protection ring 410 covers the weld seam. The conical block 31 continues to move and disengages from the convex plate 42. At the same time, the sliding of the first rack plate 41 will be transmitted, driving the connected protection component. The arc-shaped protection ring 410 in the protection component is slidably arranged above the positioning block 21. Driven by the transmission of the first rack plate 41, the arc-shaped protection ring 410 moves to the weld seam position to protect the welded weld seam from being damaged by the water in the external frame body 1. Moreover, the arc-shaped protection ring 410 can also play a role in limiting the thin plate, preventing the thin plate from shifting during the welding process, ensuring the welding accuracy and quality. Then, the convex plate 42 is pushed in turn, while keeping the thin plate limited, it can also protect the weld seam, effectively improving the welding quality and product stability; The problem that the high temperature of the welding torch causes the deformation of the thin plate is solved, and at the same time, the problem that the thin plate may be displaced is solved.

[0025] Such as Figure 3As shown in the figure, a limiting ring 32 is fixedly connected to the inner wall of the rotating ring 3 in this embodiment. One end of the limiting ring 32 is rotatably connected to an auxiliary ring 33 for limiting the welding torch.

[0026] As Figure 4 As shown in the figure, the protection component in this embodiment includes a rotating shaft 45 rotatably arranged inside the wide body. A first gear 44 is fixedly connected to the top end of the rotating shaft 45, and a second gear 46 is fixedly connected to the middle of the rotating shaft 45. The second gear 46 meshes with a second rack plate 47. A positioning frame 48 is fixedly connected to the frame 1 at the position corresponding to the second rack plate 47. The second rack plate 47 is slidably arranged on one side of the positioning frame 48. One end of the second rack plate 47 is fixedly connected to a limiting frame 49. A sliding groove 421 is formed in the limiting frame 49. An auxiliary plate 419 is slidably connected in the sliding groove 421. A compression spring 420 is fixedly connected to the upper surface of the auxiliary plate 419. The compression spring 420 is fixedly connected to the limiting frame 49. The bottom end of the auxiliary plate 419 is fixedly connected to an arc-shaped protection ring 410. A fixing cavity 411 is formed inside the arc-shaped protection ring 410. The fixing cavity 411 is used to cover the weld seam without directly contacting the weld seam. Before the conical block 31 and the convex plate 42 are about to separate, the arc-shaped protection ring 410 moves to the position of the weld seam. At this time, the arc-shaped protection ring 410 is directly above the weld seam. Under the elastic force of the compression spring 420, the arc-shaped protection ring 410 is driven to slide along the sliding groove 421, and then abuts against the arc surface of the thin plate for limiting, and at the same time covers the weld seam.

[0027] Specifically, the rotation of the rotating shaft 45 drives the second gear 46, and then the second rack plate 47 slides on the positioning frame 48, thereby driving the limiting frame 49 to move. When the arc-shaped protection ring 410 moves to the position where the original positioning block 21 abuts against the thin plate, the auxiliary plate 419 in the limiting frame 49 drives the arc-shaped protection ring 410 to slide along the sliding groove 421 under the elastic force of the compression spring 420, abuts against the arc surface of the thin plate for limiting, and covers the weld seam. Before the conical block 31 and the convex plate 42 are about to separate, the arc-shaped protection ring 410 can be timely moved directly above the weld seam, effectively protecting the weld seam from external interference, avoiding damage to the weld seam caused by collision, friction, etc., ensuring the welding quality, and improving the stability and reliability of the overall welding work.

[0028] Embodiment 2: As Figures 1 to 6As shown, compared with the first comparative example, another implementation manner of the present invention is as follows: a cooling component is provided on the upper surface of the auxiliary plate 419. The cooling component includes a positioning box 414 fixedly connected to the upper surface of the limiting frame 49. A blower 412 is provided on the upper surface of the positioning frame 48. When the arc-shaped protection ring 410 elastically moves downward to protect the weld seam, the auxiliary plate 419 moves downward, so that the fixed cavity 411 communicates with the positioning box 414. That is, the cold air of the blower 412 can enter the fixed cavity 411 to cool the weld seam. The cooling component includes a first telescopic tube 413 fixedly connected to one side of the blower 412. The first telescopic tube 413 is fixedly connected to the positioning box 414. A connection hole 417 is formed in the positioning box 414. A second telescopic tube 418 and a partition plate 415 are fixedly connected to the upper surface of the auxiliary plate 419. The partition plate 415 is inserted into the positioning box 414, and a positioning hole 416 is formed on the surface of the partition plate 415.

[0029] Specifically, when the arc-shaped protection ring 410 moves downward due to elastic action to protect the weld seam, the auxiliary plate 419 also moves downward accordingly. Since the partition plate 415 is fixedly connected to the auxiliary plate 419 and the partition plate 415 is inserted into the positioning box 414, the downward movement of the auxiliary plate 419 drives the partition plate 415 to change its position in the positioning box 414. Originally, the positioning box 414 and the fixed cavity 411 are blocked by the partition plate 415. At this time, the positioning hole 416 on the partition plate 415 gradually communicates with the connection hole 417 in the positioning box 414, so that a passage is formed between the fixed cavity 411 and the positioning box 414. The blower 412 on the positioning frame 48 continues to work, and the generated cold air is conveyed into the positioning box 414 through the first telescopic tube 413. As the fixed cavity 411 communicates with the positioning box 414, the cold air then enters the fixed cavity 411 through the second telescopic tube 418, thereby cooling the weld seam in the fixed cavity 411. On the one hand, it can cool the weld seam in time while the arc-shaped protection ring 410 protects the weld seam, effectively avoiding quality problems of the weld seam due to high-temperature residue and improving the welding quality. And because high temperature will be generated during the welding process, when the thin plate welding is cooled by the water in the frame, the high temperature generated by the thin plate welding contacts the water and causes the water to vaporize. The water mist of the water vapor is around the thin plate, resulting in an increase in humidity. Therefore, the delivery of cold air can push the water mist around the thin plate into the surrounding environment, ensuring the welding environment and indirectly improving the welding quality. On the other hand, the movement of the auxiliary plate 419 is used to drive the position change of the partition plate 415 to realize the precise delivery of cold air. The structure is simple, the operation is convenient, no additional complex control device is required, the equipment cost and maintenance difficulty are reduced, and the efficiency and stability of the entire welding process are improved.

[0030] As Figure 1 shown, in this embodiment, the switching components are distributed in a circumferential array on the blind plate circumference, and the arc-shaped protection rings 410 are switched one by one to protect the welded weld seams, while always keeping the thin plate limited.

[0031] Working principle: First, before welding, the welding torch is abutted against the rotating ring 3, and the rotating ring 3 is temporarily fixed to the welding torch. Then, the rotation of the welding torch drives the rotation of the rotating ring 3, and the conical block 31 fixedly connected to its circumferential surface rotates accordingly. As the conical block 31 rotates, it contacts the convex plate 42 at one end of the first rack plate 41 and generates a thrust, pushing the first rack plate 41 to slide on the top of the support frame 4. Since the other end of the first rack plate 41 is fixedly connected to the positioning block 21 through the connecting plate 43, the positioning block 21 will slide on the support plate 2, realizing the separation of the thin plate from the limit. After separating from the thin plate, the welding torch performs welding work along the circumference of the thin plate. When the arc length equal to that of the arc-shaped protection ring 410 is welded, at this time, the arc-shaped protection ring 410 of the protection component moves to the welded position, and the arc-shaped protection ring 410 covers the weld seam. The conical block 31 continues to move and separates from the convex plate 42. At the same time, the sliding of the first rack plate 41 will drive the transmission, driving the protection component connected thereto. The arc-shaped protection ring 410 in the protection component is slidably arranged above the positioning block 21. Driven by the transmission of the first rack plate 41, the arc-shaped protection ring 410 moves to the weld seam position to protect the welded weld seam from being damaged by the water in the external frame 1, and moreover, the arc-shaped protection ring 410 can also limit the thin plate, preventing the thin plate from shifting during the welding process, ensuring the welding precision and quality. Then, the convex plate 42 is pushed in sequence, which can protect the weld seam while keeping the thin plate limited, effectively improving the welding quality and product stability; Specifically, the first rack plate 41 drives the rotation of the rotating shaft 45, thereby driving the second gear 46. The second gear 46 drives the second rack plate 47 to slide on the positioning frame 48, thus driving the movement of the limit frame 49. When the arc-shaped protection ring 410 moves to the position where the original positioning block 21 abuts against the thin plate, the auxiliary plate 419 in the limit frame 49 drives the arc-shaped protection ring 410 to slide along the sliding groove 421 under the elastic force of the compression spring 420, abutting against and limiting the arc surface of the thin plate and covering the weld seam. It can timely move the arc-shaped protection ring 410 to directly above the weld seam before the conical block 31 and the convex plate 42 are about to separate, effectively protecting the weld seam from external interference and avoiding damage to the weld seam caused by collision, friction, etc., ensuring the welding quality and improving the stability and reliability of the overall welding work; In addition, when the arc-shaped protective ring 410 moves downward due to elastic action to protect the weld, the auxiliary plate 419 also moves downward accordingly. Since the partition plate 415 is fixedly connected to the auxiliary plate 419 and the partition plate 415 is inserted into the positioning box 414, the downward movement of the auxiliary plate 419 drives the position of the partition plate 415 in the positioning box 414 to change. Originally, the positioning box 414 and the fixed cavity 411 were blocked by the partition plate 415. At this time, the positioning hole 416 on the partition plate 415 gradually communicates with the connection hole 417 in the positioning box 414, forming a passage between the fixed cavity 411 and the positioning box 414. The blower 412 on the positioning frame 48 continuously operates, and the generated cold air is delivered into the positioning box 414 through the first telescopic tube 413. As the fixed cavity 411 communicates with the positioning box 414, the cold air then enters the fixed cavity 411 through the second telescopic tube 418, thereby cooling the weld in the fixed cavity 411. On the one hand, it can cool the weld in time while the arc-shaped protective ring 410 protects the weld, effectively avoiding quality problems of the weld due to high-temperature residues and improving the welding quality. On the other hand, by using the movement of the auxiliary plate 419 to drive the change in the position of the partition plate 415, the precise delivery of cold air is realized. The structure is simple, the operation is convenient, no additional complex control device is required, the equipment cost and maintenance difficulty are reduced, and the efficiency and stability of the entire welding process are improved.

[0032] 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 by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A small-wall-thickness corrosion-resistant blind plate welding tool, comprising a frame (1), characterized in that: A plurality of support plates (2) are arranged inside the frame (1), and each of the support plates (2) is slidably connected to a positioning block (21); A switching assembly is provided at a position corresponding to each positioning block (21) in the frame (1), the switching assembly comprising a rotating ring (3) rotatably arranged above the frame (1), the rotating circumferential surface being fixedly connected to a cone block (31), a support frame (4) being fixedly connected inside the frame (1), a first rack plate (41) being slidably connected to the top of the support frame (4), one end of the first rack plate (41) being fixedly connected to a convex plate (42), the other end of the first rack plate (41) being fixedly connected to a connecting plate (43), the connecting plate (43) being fixedly connected to the positioning block (21); The first rack plate (41) is drivingly connected to a protection component, the protection component is used to protect the weld after welding and to limit the position of the thin plate, and the protection component comprises an arc-shaped protection ring (410) slidably arranged above the positioning block (21).

2. A small-wall-thickness corrosion-resistant blind plate welding tool according to claim 1, characterized in that: The inner wall of the rotating ring (3) is fixedly connected to a limiting ring (32), and one end of the limiting ring (32) is rotatably connected to an auxiliary ring (33) for limiting the position of the welding gun.

3. The small-wall-thickness corrosion-resistant blind plate welding tool according to claim 1 is characterized in that: When the cone block (31) on the circumferential surface of the rotating ring (3) abuts against the convex plate (42) at one end of the first rack plate (41) and performs a squeezing operation, the cone block (31) pushes the convex plate (42) to move, and the convex plate (42) drives the first rack plate (41) to slide. The sliding of the first rack plate (41) drives one of the positioning blocks (21) to separate from the thin plate, and the rotating ring (3) drives the welding gun to perform welding operation, that is, after the positioning block (21) separates, the welding gun starts welding. When the welding is completed to the same arc length as the arc protection ring (410), the arc protection ring (410) of the protection component moves to the position where the welding is completed, and the arc protection ring (410) covers the weld, and the cone block (31) continues to move and separates from the convex plate (42).

4. A small-wall-thickness corrosion-resistant blind plate welding tool according to claim 3, characterized in that: The protection component comprises a rotating shaft (45) rotatably arranged inside the wide body, a first gear (44) being fixedly connected to the top end of the rotating shaft (45), a second gear (46) being fixedly connected to the middle part of the rotating shaft (45), a second gear (46) being meshed with a second rack plate (47), a positioning frame (48) being fixedly connected to a position of the frame (1) corresponding to the second rack plate (47), the second rack plate (47) being slidably arranged on one side of the positioning frame (48), one end of the second rack plate (47) being fixedly connected to a limit frame (49), a sliding groove (421) being provided in the limit frame (49), an auxiliary plate (419) being slidably connected in the sliding groove (421), a compression spring (420) being fixedly connected to the upper surface of the auxiliary plate (419), the compression spring (420) being fixedly connected to the limit frame (49), and a bottom end of the auxiliary plate (419) being fixedly connected to an arc-shaped protection ring (410).

5. A small-wall-thickness corrosion-resistant blind plate welding tool according to claim 4, characterized in that: A fixed cavity (411) is provided inside the arc-shaped protection ring (410), and the fixed cavity (411) is used to cover the weld without directly contacting the weld.

6. A small-wall-thickness corrosion-resistant blind plate welding tool according to claim 4, characterized in that: Before the cone block (31) and the convex plate (42) are about to separate, the arc-shaped protection ring (410) moves to the weld. At this time, the arc-shaped protection ring (410) is located directly above the weld. Under the elastic force of the compression spring (420), the arc-shaped protection ring (410) is driven to slide along the sliding groove (421), thereby abutting against the arc surface of the thin plate to limit the position, while covering the weld.

7. The small-wall-thickness corrosion-resistant blind plate welding tool according to claim 4 is characterized by: A cooling assembly is disposed on the upper surface of the auxiliary plate (419), and the cooling assembly includes a positioning box (414) fixedly connected to the upper surface of the limiting frame (49). A blower (412) is disposed on the upper surface of the positioning frame (48). When the arc-shaped protection ring (410) elastically moves downward to protect the weld, the auxiliary plate (419) moves downward to connect the fixed cavity (411) with the positioning box (414), that is, cold air from the blower (412) can enter the fixed cavity (411) to cool the weld.

8. The small-wall-thickness corrosion-resistant blind plate welding tool according to claim 7 is characterized in that: The cooling assembly includes a first telescopic tube (413) fixedly connected to one side of the blower (412), the first telescopic tube (413) being fixedly connected to a positioning box (414), a connecting hole (417) being provided in the positioning box (414), a second telescopic tube (418) and a partition (415) being fixedly connected to the upper surface of the auxiliary plate (419), the partition (415) being inserted into the positioning box (414), and a positioning hole (416) being provided on the surface of the partition (415).

9. A small-wall-thickness corrosion-resistant blind plate welding tool according to claim 8, characterized in that: When the arc-shaped protection ring (410) moves downward, it drives the second telescopic tube (418) to expand and contract, and at the same time drives the partition plate (415) to move downward, so that the positioning hole (416) is connected to the connecting hole (417), and then the cold air blown by the blower (412) enters the fixed cavity (411) to cool the weld.

10. The small-wall-thickness corrosion-resistant blind plate welding tool according to claim 1, characterized in that: The switching components are distributed in a circular array around the circumference of the blind plate, and the arc-shaped protection rings (410) are switched one by one to protect the weld seam after welding, while the thin plate is always limited.

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