Tool suitable for narrow barrel longitudinal seam welding

Abstract

The invention relates to the technical field of longitudinal seam welding tools, and discloses a tool suitable for narrow barrel longitudinal seam welding, the tool comprises an arc-shaped plate, the top of the arc-shaped plate is used for placing a narrow barrel, the arc-shaped plate is provided with a pressing part and a jacking part, the pressing part is used for pressing the narrow barrel on the arc-shaped plate, and the jacking part is used for jacking the narrow barrel on the arc-shaped plate. The abutting part is used for abutting the narrow barrel, the arc-shaped plate is placed on the rolling wheel, the wide arc-shaped plate is placed on the rolling wheel, the contact area can be increased, then placing is more stable, it is guaranteed that the position of the narrow barrel is fixed in the welding process, the pressing part is arranged for pressing the narrow barrel on the arc-shaped plate, the narrow barrel is prevented from falling off from the arc-shaped plate, and the welding quality is improved. The jacking part is arranged to jack the narrow barrel from the side face, a gap between the narrow barrel and the arc-shaped plate is eliminated, shaking of the narrow barrel in the welding process is avoided, the welding line quality is guaranteed, the manual adjustment frequency is reduced through stable tool positioning, the operation difficulty is lowered, and the auxiliary time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of longitudinal seam welding tooling, and particularly to a tooling applicable to the longitudinal seam welding of narrow cylinders. Background Art

[0002] As the diameter of wind power generation tower barrels is getting larger and larger, in order to meet the design requirements, many narrow cylinders with a length of less than 1.2 meters have emerged. When welding the longitudinal seams of these tower bodies, if the tower sections are placed on rollers, the risk of tipping is very high. To eliminate the safety risks during the longitudinal seam welding of narrow cylinders, it is necessary to design and manufacture special tooling for the longitudinal seam welding of narrow cylinders. Summary of the Invention

[0003] The purpose of the present invention is to provide a tooling applicable to the longitudinal seam welding of narrow cylinders to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A tooling applicable to the longitudinal seam welding of narrow cylinders, including an arc-shaped plate. The top of the arc-shaped plate is used to place the narrow cylinder. A pressing component and a jacking component are installed on the arc-shaped plate. The pressing component is used to press the narrow cylinder onto the arc-shaped plate, and the jacking component is used to jack the narrow cylinder tightly. The arc-shaped plate is placed on the rollers; Both the pressing component and the jacking component are provided with two groups and are symmetrically distributed about the center of the arc-shaped plate.

[0005] Further, the pressing component includes two front and rear fixing plates or pressing blocks two. The fixing plates are welded to the top of the arc-shaped plate. The narrow cylinder is located between the two fixing plates. A inserting rod passes through the fixing plates movably. A pressing block one is sleeved on the outer wall of the inserting rod movably. The pressing block one presses on the inner side of the narrow cylinder. A fixing nut is connected to the end of the inserting rod by threading.

[0006] Further, the lower surface of the pressing block one is a curved surface and fits the inner side surface of the narrow cylinder. An elastic gasket is sleeved on the outer wall of the inserting rod slidably, and this elastic gasket is located between the fixing plate and the fixing nut.

[0007] Further, the front and back surfaces of the pressing block one are provided with integrally formed extension bodies. The lower surface of the extension body is continuous with the lower surface of the pressing block one, and the thickness of the extension body is greater than the thickness of the pressing block one.

[0008] Further, the pressing component includes two front and rear arc-shaped guide rails or the second pressing block. The arc-shaped guide rails are fixedly installed on the top of the arc-shaped plate. A slider is slidably arranged inside the arc-shaped guide rails. A rotating shaft is rotatably connected to the slider through a bearing. A first pressing block is fixedly installed on the outer wall of the rotating shaft. The first pressing block abuts against the outer side surface of the narrow cylinder body. A rotating component is arranged outside the rotating shaft. A fixing component is arranged on the arc-shaped guide rails. The first pressing block presents a water droplet shape with one end large and one end small, and the larger end of the first pressing block faces the center of the arc-shaped plate.

[0009] Further, the rotating component includes an arc-shaped rack and a gear. The arc-shaped rack is fixedly installed on the arc-shaped guide rails. The gear is fixedly installed on the rotating shaft. The arc-shaped rack meshes with the gear.

[0010] Further, the fixing component includes an arc-shaped push rod and a pressing bolt. One end of the arc-shaped push rod is movably inserted into the arc-shaped guide rails, and this end abuts against the slider. The pressing bolt is threadedly connected to the arc-shaped guide rails, and the end of the pressing bolt presses on the arc-shaped push rod.

[0011] Further, positioning plates are welded at the four corners of the arc-shaped plate. A positioning column is fixedly installed at the bottom of the positioning plate. Threaded holes communicating with each other are opened at the centers of the positioning plate and the positioning column.

[0012] Further, the second pressing block is pressed against the inner side of the narrow cylinder body by the inserting rod. The lower surface of the second pressing block is the same as the lower surface of the first pressing block, and a groove matching the inserting rod is opened at the position where the second pressing block contacts the inserting rod.

[0013] Further, the upper surface of the second pressing block is a curved surface and fits the outer side surface of the narrow cylinder body. The second pressing block is stuck between the arc-shaped plate and the narrow cylinder body.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: Placing the wider arc-shaped plate on the rollers can increase the contact area, thereby making the placement more stable, ensuring the fixed position of the narrow cylinder body during the welding process. A pressing component is provided to press the narrow cylinder body onto the arc-shaped plate to prevent the narrow cylinder body from falling off the arc-shaped plate. A pressing component is provided to tightly press the narrow cylinder body from the side to eliminate the gap between the narrow cylinder body and the arc-shaped plate, avoid the shaking of the narrow cylinder body during the welding process, ensure the weld quality, and the stable fixture positioning reduces the number of manual adjustments, reduces the operation difficulty, and shortens the auxiliary time; at the same time, the cylinder body is fixed reliably, reducing the weld defects caused by displacement during the welding process. The two groups of pressing components and pressing components are symmetrically distributed on both sides of the center of the arc-shaped plate, which can evenly apply pressure, prevent the narrow cylinder body from deforming due to unilateral force, and ensure the straightness of the narrow cylinder body during welding. When placing the narrow cylinder body, the insertion rod does not pass through the fixed plate. After the placement is completed, the first pressing block is placed inside the narrow cylinder body, and then the insertion rod passes through the fixed plate and the first pressing block, so that the first pressing block presses against the inside of the narrow cylinder body. Then, the insertion rod is fixed by the fixing nut. The two fixed plates and a first pressing block form a triangular constraint, effectively restricting the radial and axial displacements of the narrow cylinder body, especially suitable for the straightness requirements during longitudinal seam welding. The pressing force is transmitted through the inside of the narrow cylinder body, avoiding the ovalization deformation of the narrow cylinder body that may be caused by external pressure. The increased thickness of the extension body improves the bending stiffness of the first pressing block, especially effectively suppressing local flexural deformation in the welding heat input area. The extension body can be integrated with positioning pin holes or sensor mounting seats to realize real-time monitoring during the welding process and improve the control accuracy of the weld misalignment amount; The slider slides along the arc-shaped guide rail and can be adapted to narrow cylinder bodies of different diameters. The first tightening block rotates through a bearing and automatically adapts to the installation error between the generatrix of the narrow cylinder body and the arc-shaped guide rail. The water-drop shape enables the curvature of the upper surface of the first tightening block to change during the rotation of the first tightening block, thereby better matching narrow cylinder bodies of different diameters; When the slider moves along the arc-shaped guide rail, the slider drives the rotating shaft to move, causing the gear on the rotating shaft to be pushed by the arc-shaped rack and rotate, so that the first tightening block can be transversely pressed against the narrow cylinder body and can also vertically tighten the narrow cylinder body, improving the tightening effect and efficiency; Compared with using the first pressing block sleeved on the insertion rod to press the narrow cylinder body, when using the second pressing block for pressing, after passing through the insertion rod, the second pressing block can be placed, and the second pressing block can be knocked and embedded into the gap between the insertion rod and the narrow cylinder body, which can better press the narrow cylinder body. Compared with the first tightening block that requires pushing the slider to adjust the position, the second tightening block can be set more flexibly. When tightening the narrow cylinder body, only need to knock the second tightening block to make the second tightening block embedded into the gap between the arc-shaped plate and the narrow cylinder body, and the operation is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention; Figure 2 is a schematic structural diagram of the bottom view of the arc-shaped plate in Embodiment 1 of the present invention; Figure 3 is a schematic structural diagram of the front cross-sectional view of the pressing component and the tightening component in Embodiment 1 of the present invention; Figure 4 is a schematic structural diagram of the pressing component in Embodiment 1 of the present invention; Figure 5 is a schematic structural diagram of the first pressing block in Embodiment 1 of the present invention; Figure 6 is a schematic structural diagram of the tightening component in Embodiment 1 of the present invention; Figure 7Schematic diagram of the rotating component and the fixed component in Embodiment 1 of the present invention; Figure 8 Schematic diagram of the first pressing block in Embodiment 1 of the present invention; Figure 9 Schematic diagram of Embodiment 2 of the present invention; Figure 10 Schematic diagram of the front sectional view of the pressing component and the jacking component in Embodiment 2 of the present invention.

[0016] In the figure: 1, arc plate; 2, narrow cylinder; 3, pressing component; 301, fixing plate; 302, inserting rod; 303, first pressing block; 304, fixing nut; 305, second pressing block; 4, jacking component; 401, arc guide rail; 402, slider; 403, rotating shaft; 404, first jacking block; 405, rotating component; 406, fixed component; 407, second jacking block; 4051, arc rack; 4052, gear; 4061, arc push rod; 4062, pressing bolt; 5, positioning plate; 6, positioning column; 7, extension body. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] Embodiment 1 Please refer to Figures 1 - 8 , the present invention provides a technical solution: A tooling applicable to the longitudinal seam welding of a narrow cylinder includes an arc plate 1. The top of the arc plate 1 is used to place the narrow cylinder 2. A pressing component 3 and a jacking component 4 are installed on the arc plate 1. The pressing component 3 is used to press the narrow cylinder 2 onto the arc plate 1, and the jacking component 4 is used to jack up the narrow cylinder 2. The arc plate 1 is placed on the rollers. Compared with placing the narrow cylinders 2 on the rollers, placing the wider arc plate 1 on the rollers can increase the contact area, thereby making the placement more stable, effectively avoiding the rolling and offset of the narrow cylinder 2 caused by unstable center of gravity, ensuring the fixed position of the narrow cylinder 2 during the welding process. The pressing component 3 is set to press the narrow cylinder 2 onto the arc plate 1 to prevent the narrow cylinder 2 from falling off the arc plate 1. The jacking component 4 is set to jack up the narrow cylinder 2 from the side to eliminate the gap between the narrow cylinder 2 and the arc plate 1, avoid the shaking of the narrow cylinder 2 during the welding process, and ensure the weld quality. The stable tooling positioning reduces the number of manual adjustments, reduces the operation difficulty, and shortens the auxiliary time; at the same time, the cylinder is fixed reliably, reducing the weld defects caused by displacement during the welding process; Both the pressing member 3 and the jacking member 4 are provided with two groups, and are symmetrically distributed about the center of the arc-shaped plate 1. The two groups of pressing members 3 and jacking members 4 are symmetrically distributed on both sides of the center of the arc-shaped plate 1, which can apply pressure evenly, avoid deformation of the narrow cylinder 2 caused by unilateral force, and ensure the straightness of the narrow cylinder 2 during welding; The pressing member 3 includes two front and rear fixing plates 301. The fixing plates 301 are welded to the top of the arc-shaped plate 1. The narrow cylinder 2 is located between the two fixing plates 301. A through rod 302 is movably passed through the fixing plates 301. A pressing block 303 is movably sleeved on the outer wall of the through rod 302. The pressing block 303 presses on the inner side of the narrow cylinder 2. The end of the through rod 302 is threadedly connected with a fixing nut 304. When placing the narrow cylinder 2, the through rod 302 does not pass through the fixing plate 301. After placing, the pressing block 303 is placed on the inner side of the narrow cylinder 2, and then the through rod 302 is passed through the fixing plate 301 and the pressing block 303, so that the pressing block 303 presses on the inner side of the narrow cylinder 2, and then the through rod 302 is fixed by the fixing nut 304. The two fixing plates 301 and a pressing block 303 form a triangular constraint, effectively restricting the radial and axial displacement of the narrow cylinder 2, especially suitable for the straightness requirement during longitudinal seam welding. The pressing force is conducted through the inside of the narrow cylinder 2, avoiding the ovalization deformation of the narrow cylinder 2 that may be caused by external pressure; The lower surface of the pressing block 303 is a curved surface and fits with the inner side surface of the narrow cylinder 2. The curved surface completely fits with the inner side of the narrow cylinder 2, converting the concentrated pressure into surface contact, reducing the pressure per unit area, and thus avoiding the depression deformation caused by single-point pressing. An elastic gasket is slidably sleeved on the outer wall of the through rod 302, and the elastic gasket is located between the fixing plate 301 and the fixing nut 304. The elastic gasket can absorb the manufacturing error and thermal expansion deformation of the narrow cylinder 2, ensuring that the fixing nut 304 can still maintain a constant pressing force after initial tightening; The front and back surfaces of the pressing block 303 are provided with integrally formed extension bodies 7. The lower surface of the extension body 7 is continuous with the lower surface of the pressing block 303, and the thickness of the extension body 7 is greater than the thickness of the pressing block 303. The increased thickness of the extension body 7 improves the bending stiffness of the pressing block 303, especially effectively suppressing local flexural deformation in the welding heat input area. The extension body 7 can be integrated with positioning pin holes or sensor mounting seats to realize real-time monitoring during the welding process and improve the control accuracy of the weld misalignment amount; The pressing component 4 includes two arc-shaped guide rails 401 at the front and back. The arc-shaped guide rails 401 are fixedly installed on the top of the arc-shaped plate 1. A slider 402 is slidably arranged inside the arc-shaped guide rail 401. A rotating shaft 403 is rotatably connected inside the slider 402 through a bearing. A first pressing block 404 is fixedly installed on the outer wall of the rotating shaft 403. The first pressing block 404 abuts against the outer side surface of the narrow cylinder body 2. A rotating component 405 is arranged outside the rotating shaft 403, and a fixing component 406 is arranged on the arc-shaped guide rail 401. The first pressing block 404 is in a water droplet shape with one end large and one end small, and the larger end of the first pressing block 404 faces the center of the arc-shaped plate 1. The slider 402 slides along the arc-shaped guide rail 401, which can adapt to narrow cylinder bodies 2 with different diameters. The first pressing block 404 rotates through a bearing to automatically adapt to the installation error between the generatrix of the narrow cylinder body 2 and the arc-shaped guide rail 401. The water droplet shape enables the curvature of the curved surface of the first pressing block 404 to change during the rotation of the first pressing block 404, so as to better match narrow cylinder bodies 2 with different diameters; The rotating component 405 includes an arc-shaped rack 4051 and a gear 4052. The arc-shaped rack 4051 is fixedly installed on the arc-shaped guide rail 401, and the gear 4052 is fixedly installed on the rotating shaft 403. The arc-shaped rack 4051 meshes with the gear 4052. When the slider 402 moves along the arc-shaped guide rail 401, the slider 402 drives the rotating shaft 403 to move, so that the gear 4052 on the rotating shaft 403 is pushed by the arc-shaped rack 4051 to rotate, enabling the first pressing block 404 to press against the narrow cylinder body 2 horizontally and also vertically tighten the narrow cylinder body 2, improving the pressing effect and pressing efficiency; The fixing component 406 includes an arc-shaped push rod 4061 and a pressing bolt 4062. One end of the arc-shaped push rod 4061 is movably inserted into the arc-shaped guide rail 401, and this end abuts against the slider 402. The pressing bolt 4062 is threadedly connected to the arc-shaped guide rail 401, and the end of the pressing bolt 4062 presses on the arc-shaped push rod 4061. When the first pressing block 404 has pressed tightly against the narrow cylinder body 2, the arc-shaped push rod 4061 abuts against the slider 402 to prevent the slider 402 from moving, thereby ensuring the pressing effect on the narrow cylinder body 2 during the welding process; Positioning plates 5 are welded at the four corners of the arc-shaped plate 1. Positioning columns 6 are fixedly installed at the bottom of the positioning plates 5. Threaded holes communicating with each other are opened at the centers of the positioning plates 5 and the positioning columns 6. The positioning plates 5 and the positioning columns 6 are provided for fixedly connecting the arc-shaped plate 1 with a ground fixture. The arc-shaped plate 1 and the ground fixture are connected and tightened by an adjustable chain block or a turnbuckle.

[0019] Working principle: When in use, select the arc plate 1 within the corresponding range according to the size of the narrow cylinder body 2, then connect the arc plate 1 with the ground fixture. The arc plate 1 and the ground fixture are connected and tightened with an adjustable chain hoist or turnbuckle. Place the arc plate 1 on the rollers, place the narrow cylinder body 2 on the arc plate 1, then press the first pressing block 303 against the inner side of the narrow cylinder body 2, align the insertion rod 302 with the fixing plate 301 and the first pressing block 303 and pass it through, and then screw on the fixing nut 304 to fix the insertion rod 302. When selecting the first pressing block 303, select the one with a size matching the narrow cylinder body 2. Then push the rotating shaft 403 towards the narrow cylinder body 2 so that the first tightening block 404 presses against the narrow cylinder body 2 on the outer side of the narrow cylinder body 2. When the rotating shaft 403 moves, the arc-shaped rack 4051 drives the gear 4052 to rotate, thereby driving the rotating shaft 403 to rotate, making the first tightening block 404 on the rotating shaft 403 rotate, so that the first tightening block 404 can also apply a vertical force to tighten the narrow cylinder body 2, and then welding operation can be carried out. During the operation, the welding trolley can also freely enter and exit the narrow cylinder body 2.

[0020] Embodiment 2 Please refer to Figures 1 - 10 The present invention provides a technical solution: A tooling suitable for longitudinal seam welding of narrow cylinder bodies, including an arc plate 1. The top of the arc plate 1 is used to place the narrow cylinder body 2. A pressing component 3 and a tightening component 4 are installed on the arc plate 1. The pressing component 3 is used to press the narrow cylinder body 2 on the arc plate 1, and the tightening component 4 is used to tighten the narrow cylinder body 2. The arc plate 1 is placed on the rollers. Compared with placing the narrow cylinder bodies directly on the rollers, placing the wider arc plate 1 on the rollers can increase the contact area, thereby making the placement more stable, effectively avoiding the rolling and offset of the narrow cylinder body 2 caused by unstable center of gravity, and ensuring the fixed position of the narrow cylinder body 2 during the welding process. The pressing component 3 is provided to press the narrow cylinder body 2 onto the arc plate 1 to prevent the narrow cylinder body 2 from falling off the arc plate 1. The tightening component 4 tightens the narrow cylinder body 2 from the side to eliminate the gap between the narrow cylinder body 2 and the arc plate 1, avoiding the shaking of the narrow cylinder body 2 during the welding process and ensuring the weld quality. The stable tooling positioning reduces the number of manual adjustments, reduces the operation difficulty, and shortens the auxiliary time; at the same time, the cylinder body is fixed reliably, reducing the weld defects caused by displacement during the welding process; Both the pressing component 3 and the tightening component 4 are provided with two groups, and are symmetrically distributed about the center of the arc plate 1 on the left and right. The two groups of pressing components 3 and tightening components 4 are symmetrically distributed on both sides of the center of the arc plate 1, which can evenly apply pressure, avoid the deformation of the narrow cylinder body 2 caused by unilateral force, and at the same time ensure the straightness of the narrow cylinder body 2 during welding; The pressing component 3 includes two front and rear fixing plates 301 and a second pressing block 305. The fixing plates 301 are welded to the top of the arc-shaped plate 1. The narrow cylinder 2 is located between the two fixing plates 301. A penetrating rod 302 movably passes through the fixing plates 301. A fixing nut 304 is threadedly connected to the end of the penetrating rod 302. The second pressing block 305 is pressed against the inner side of the narrow cylinder 2 by the penetrating rod 302. The lower surface of the second pressing block 305 is the same as the lower surface of the first pressing block 303. And a groove matching the penetrating rod 302 is provided at the part of the second pressing block 305 in contact with the penetrating rod 302. Compared with using the first pressing block 303 sleeved on the penetrating rod 302 to press the narrow cylinder 2, when using the second pressing block 305 for pressing, after passing through the penetrating rod 302, the second pressing block 305 can be placed, and the second pressing block 305 can be knocked and embedded into the gap between the penetrating rod 302 and the narrow cylinder 2, which can better press the narrow cylinder 2; The jacking component 4 includes a second jacking block 407. The upper surface of the second jacking block 407 is a curved surface and fits the outer side surface of the narrow cylinder 2. The second jacking block 407 is stuck between the arc-shaped plate 1 and the narrow cylinder 2. Compared with the first jacking block 404 that needs to push the slider 402 to adjust the position, the second jacking block 407 can be set more flexibly. When jacking the narrow cylinder 2, only need to knock the second jacking block 407 so that the second jacking block 407 is embedded into the gap between the arc-shaped plate 1 and the narrow cylinder 2, and the operation is simpler; Positioning plates 5 are welded at the four corners of the arc-shaped plate 1. Positioning columns 6 are fixedly installed at the bottom of the positioning plates 5. Threaded holes communicating with each other are provided at the centers of the positioning plates 5 and the positioning columns 6. The positioning plates 5 and the positioning columns 6 are provided to connect and fix the arc-shaped plate 1 to the ground fixture. The arc-shaped plate 1 and the ground fixture are connected and tightened by an adjustable chain hoist or a turnbuckle.

[0021] Working principle: When in use, select the arc-shaped plate 1 within the corresponding range according to the size of the narrow cylinder 2, then connect the arc-shaped plate 1 to the ground fixture. The arc-shaped plate 1 and the ground fixture are connected and tightened by an adjustable chain hoist or a turnbuckle, and place the arc-shaped plate 1 on the rollers, place the narrow cylinder 2 on the arc-shaped plate 1, pass the penetrating rod 302 through the fixing plates 301, and then screw on the fixing nut 304 to fix the penetrating rod 302. Select the second pressing block 305 with the corresponding size, knock the second pressing block 305 from the side into the gap between the penetrating rod 302 and the narrow cylinder 2, so that the second pressing block 305 presses the narrow cylinder 2 tightly. Take out two second jacking blocks 407 matching the narrow cylinder 2, and then knock the second jacking blocks 407, embed the second jacking blocks 407 into the gap between the arc-shaped plate 1 and the narrow cylinder 2 to realize the jacking of the narrow cylinder 2, and then welding operation can be carried out.

[0022] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

Claims

1. A tooling applicable to the longitudinal seam welding of a narrow cylinder body, comprising an arc-shaped plate (1), characterized in that: The top of the arc-shaped plate (1) is used to place the narrow cylinder body (2). A pressing component (3) and a jacking component (4) are installed on the arc-shaped plate (1). The pressing component (3) is used to press the narrow cylinder body (2) against the arc-shaped plate (1), and the jacking component (4) is used to jack up the narrow cylinder body (2). The arc-shaped plate (1) is placed on the rollers; Both the pressing component (3) and the jacking component (4) are provided with two groups, and are symmetrically distributed about the center of the arc-shaped plate (1).

2. The tooling applicable to longitudinal seam welding of a narrow cylinder according to claim 1, wherein: The pressing component (3) includes two front and rear fixing plates (301) or pressing blocks two (305). The fixing plates (301) are welded to the top of the arc-shaped plate (1). The narrow cylinder body (2) is located between the two fixing plates (301). An insertion rod (302) movably passes through the fixing plates (301). A pressing block one (303) is movably sleeved on the outer wall of the insertion rod (302). The pressing block one (303) presses against the inner side of the narrow cylinder body (2). A fixing nut (304) is threadedly connected to the end of the insertion rod (302).

3. The tooling applicable to longitudinal seam welding of a narrow cylinder according to claim 2, wherein: The lower surface of the pressing block one (303) is a curved surface and fits the inner side surface of the narrow cylinder body (2). An elastic gasket is slidably sleeved on the outer wall of the insertion rod (302), and this elastic gasket is located between the fixing plate (301) and the fixing nut (304).

4. A tooling applicable to longitudinal seam welding of narrow cylinders according to claim 2, characterized in that: The front and back surfaces of the pressing block one (303) are provided with integrally formed extension bodies (7). The lower surface of the extension body (7) is continuous with the lower surface of the pressing block one (303), and the thickness of the extension body (7) is greater than the thickness of the pressing block one (303).

5. A tooling applicable to longitudinal seam welding of a narrow cylinder, characterized in that: The jacking component (4) includes two front and rear arc-shaped guide rails (401) or jacking blocks two (407). The arc-shaped guide rails (401) are fixedly installed on the top of the arc-shaped plate (1). A slider (402) is slidably arranged inside the arc-shaped guide rails (401). A rotating shaft (403) is rotatably connected to the slider (402) through a bearing. A jacking block one (404) is fixedly installed on the outer wall of the rotating shaft (403). The jacking block one (404) abuts against the outer side surface of the narrow cylinder body (2). A rotating component (405) is arranged outside the rotating shaft (403). A fixing component (406) is arranged on the arc-shaped guide rail (401). The jacking block one (404) is in a water droplet shape with one end large and one end small, and the larger end of the jacking block one (404) faces the center of the arc-shaped plate (1).

6. The fixture applicable to longitudinal seam welding of a narrow cylinder according to claim 5, characterized in that: The rotating component (405) includes an arc-shaped rack (4051) and a gear (4052). The arc-shaped rack (4051) is fixedly installed on the arc-shaped guide rail (401). The gear (4052) is fixedly installed on the rotating shaft (403). The arc-shaped rack (4051) meshes with the gear (4052).

7. A tooling applicable to longitudinal seam welding of a narrow cylinder, characterized in that: The fixing component (406) includes an arc-shaped push rod (4061) and a pressing bolt (4062). One end of the arc-shaped push rod (4061) is movably inserted into the arc-shaped guide rail (401), and this end abuts against the slider (402). The pressing bolt (4062) is threadedly connected to the arc-shaped guide rail (401), and the end of the pressing bolt (4062) presses on the arc-shaped push rod (4061).

8. A tooling applicable to longitudinal seam welding of narrow cylinders according to claim 1, characterized in that: Positioning plates (5) are welded at the four corners of the arc-shaped plate (1). Positioning columns (6) are fixedly installed at the bottoms of the positioning plates (5). Threaded holes that communicate with each other are formed at the centers of the positioning plates (5) and the positioning columns (6).

9. The tooling applicable to longitudinal seam welding of a narrow cylinder according to claim 2, characterized in that: The second pressing block (305) is pressed against the inner side of the narrow cylinder body (2) by the inserting rod (302). The lower surface of the second pressing block (305) is the same as the lower surface of the first pressing block (303), and a groove matching the inserting rod (302) is formed at the part of the second pressing block (305) that contacts the inserting rod (302).

10. A tooling applicable to longitudinal seam welding of a narrow cylinder, characterized in that: The upper surface of the second tightening block (407) is a curved surface and fits against the outer side surface of the narrow cylinder body (2). The second tightening block (407) is stuck between the arc-shaped plate (1) and the narrow cylinder body (2).

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