A large thin-walled cylindrical container welding and sizing device

Abstract

The utility model relates to pressure vessel auxiliary processing equipment, especially a large -scale thin -walled cylindrical container welding type correcting device. Including independent support grid and jack, independent support grid is arc, and independent support grid includes support frame and support lamination, and the material of support frame and support lamination is steel, and support lamination sets up in support frame side part, and support lamination sticks together cylinder body, independent support grid is equipped with a plurality of, and a plurality of independent support grid head -tail splicing along cylinder body circumference even distribution and is formed single -layer support subassembly, and the head end and tail end of single -layer support subassembly are supported through jack top extension, and single -layer support subassembly sticks together and supports cylinder body. After the jack tightness, single -layer support subassembly forms the circular ring type support structure. After forcing, a plurality of independent support grid even distribution is realized in the type correcting work of cylinder inner wall.

Description

Technical Field

[0001] This utility model relates to auxiliary processing equipment for pressure vessels, and in particular to a welding and straightening device for large thin-walled cylindrical containers. Background Technology

[0002] The following problems often exist in the welding and forming process of existing large thin-walled cylindrical containers: I. Insufficient Materials 1. Anisotropy and Springback – Anisotropy may occur during the rolling process of sheet metal, leading to uneven springback during coiling, affecting roundness and flatness. Uneven material thickness or fluctuations in mechanical properties can easily cause localized deformation or stress concentration. The uneven thickness or fluctuations in mechanical properties of the material itself can further affect the welding quality of cylindrical containers. 2. Residual Stress Issues – Residual stress after forming or welding may not be completely eliminated. After straightening, slow deformation may occur due to stress release, affecting long-term stability. Large cylindrical bodies are spliced ​​from single steel plates, with welding required around the perimeter of the central steel plate. Due to the thickness of the sheet metal, the impact of residual stress is greater, requiring slow and stable release through straightening. Therefore, a straightening device is urgently needed for residual stress elimination.

[0003] II. Defects in Molding Process 1. Roll Forming Issues – Improper rolling parameters (such as pressure and speed) can easily lead to wavy or locally concave cylinders. During the rolling process, "bulges" or "ruffled edges" are prone to form on the edges of the sheet metal. To ensure the mechanical properties of the equipment, roll-formed cylinders are generally rolled along the rolling direction of the steel plate. The normal rolling length of a steel plate is 6m, and the length of a customized steel plate generally does not exceed 12m. For small-diameter cylinders, straight edges are usually reserved at both ends after rolling, and then the cylinder is shaped after welding. However, for large cylinders, due to the limited sheet width, they cannot be formed in one go. Therefore, they are usually formed by pre-pressing multiple sections and then uniformly shaped later. This results in differences in roundness after forming, which has a significant impact on the forming of large equipment composed of multiple cylinder sections. 2. Welding Deformation and Shrinkage – Differences in shrinkage between longitudinal and circumferential welds can lead to excessive ellipticity or locally protruding areas. An unreasonable welding sequence can cause residual stress concentration, increasing the difficulty of shaping.

[0004] III. Limitations of the calibration process 1. Limitations of mechanical straightening: Localized pressure straightening can easily lead to secondary deformation (such as dents or over-straightening). Thin-walled structures have poor rigidity and may spring back after the external force is removed, resulting in unstable straightening effects. 2. Difficulty in heat treatment processes: Overall annealing of large containers is difficult; localized heating may lead to new thermal stresses or changes in material properties. It can also cause localized deformation, and improper heating of localized materials can cause permanent damage. It is only suitable for localized adjustments and not for overall heat treatment.

[0005] IV. Tooling and Testing Issues 1. Mismatched tooling and fixtures – Lack of effective internal support or external fixing devices prevents even force distribution during alignment, leading to out-of-roundness or twisting. Fixture design fails to consider the easily deformable characteristics of thin-walled components, causing stress concentration at contact points. 2. Insufficient inspection methods – Reliance on traditional measuring tools makes it difficult to comprehensively assess parameters such as ellipticity and straightness. Insufficient application of automated inspection technology means alignment adjustments rely on manual experience, resulting in low efficiency and poor accuracy.

[0006] In summary, there is an urgent need for an easy-to-implement and accurate welding auxiliary calibration device for large thin-walled cylindrical containers in the current processing and production of such containers. Utility Model Content

[0007] This utility model addresses the shortcomings of existing technologies by providing a dedicated calibration device. It is designed for thin-walled, large-diameter cylindrical containers with a diameter greater than 10 mm and a wall thickness of 10 mm to 15 mm. This device is specifically designed to correct roundness deviations during forming and splicing operations, and to prevent stress deformation caused by thermal deformation during welding operations.

[0008] A welding and alignment device for a large thin-walled cylindrical container includes independent support grids and jacks. The independent support grids are arc-shaped and include a support frame and a support plate. The support frame and the support plate are made of steel. The support plate is located on the side of the support frame and fits against the cylindrical body. Multiple independent support grids are provided and are evenly distributed along the circumference of the cylindrical body to form a single-layer support assembly. The head and tail ends of the single-layer support assembly are supported by the jacks, and the single-layer support assembly fits against the cylindrical body.

[0009] The cylinder body is provided with multiple support rods, and independent support grids are placed on the support rods. Each independent support grid has 2 support rods at its bottom.

[0010] The support frame is provided with diagonal bracing at its four corners.

[0011] The support bonding plate is equipped with a buffer pad made of rubber, and the support bonding plate is bonded to the cylinder body through the buffer pad.

[0012] The support frame and the support bonding plate are welded along the center line, and the side end of the support bonding plate is a free end; a threaded hole is opened on the support frame, and an adjusting bolt is threadedly connected to the threaded hole. The adjusting bolt extends out of the support frame, and the end of the adjusting bolt is attached to the free end of the support bonding plate. The position of the free end of the support bonding plate is adjusted by extending the adjusting bolt.

[0013] The support frame is provided with multiple threaded holes and adjusting bolts. Each adjusting bolt is a position adjustment point, and the position of the free end of the support plate on each node is adjusted by adjusting the adjusting bolt.

[0014] The thickness of the supporting bonding plate is 15-20mm; the diameter of the cylinder is greater than 10m, and the wall thickness of the cylinder is 10-15mm.

[0015] The single-layer support assembly is provided in multiple sets, arranged layer by layer along the height direction of the cylinder.

[0016] The jacking force is not less than 5 tons. The jacking pressure causes the single-layer support component to generate radial expansion force, and the overall alignment work is completed by multiple independent support grids applying force at multiple points.

[0017] The advantages of this invention are as follows: This invention includes multiple independent support grids evenly distributed along the circumference of the cylinder. Each independent support grid serves as a force transmission unit, and diagonal braces are provided at the four corners to ensure the strength of each individual force transmission unit. After the jack is tightened, the single-layer support assembly forms a circular support structure. After force is applied, the multiple independent support grids are evenly distributed on the inner wall of the cylinder to achieve the shape correction work. The single-layer support assembly is removed after all welding is completed. This invention provides high accuracy in correcting the roundness of the cylinder, and avoids welding thermal deformation through the support and heat dissipation of the steel support frame and support bonding plate; it has a simple structure and is easy to operate; it is suitable for on-site construction of large thin-walled containers. Attached Figure Description

[0018] Figure 1 Schematic diagram of independent support grid assembly for the cylinder body; Figure 2 This is a schematic diagram of an independently supported lattice structure; Figure 3 A schematic diagram showing the multiple adjustment points of the support frame; Figure 4 Side view of an independent support grid; Figure 5 This is a cross-sectional view of the independent support structure and a schematic diagram of the adjustment of the support bonding plate.

[0019] The markings in the diagram are: 1. Independent support grid; 2. Support frame; 3. Supporting plate; 4. Support rod; 5. Jack; 6. Diagonal tie rod; 7. Buffer pad; 8. Adjusting bolt; 9. Cylinder body. Detailed Implementation

[0020] Further explanation is provided below in conjunction with the accompanying drawings: A welding and alignment device for a large thin-walled cylindrical container includes an independent support grid 1 and jacks 5. The independent support grid 1 is arc-shaped and includes a support frame 2 and a support fitting plate 3. The support frame 2 and the support fitting plate 3 are made of steel. The support fitting plate 3 is located on the side of the support frame 2 and fits against the cylindrical body 9. Multiple independent support grids 1 are provided, and the multiple independent support grids 1 are spliced ​​end to end and evenly distributed along the circumference of the cylindrical body 9 to form a single-layer support assembly. The jacks 5 extend and support the head and tail ends of the single-layer support assembly, which fits against the cylindrical body 9. Each independent support grid 1, as an independent force-applying unit, achieves close support with the inner wall of the cylindrical body 9 through splicing and combination.

[0021] The cylindrical body 9 is provided with multiple support rods 4, and independent support grids 1 are placed on the support rods 4. Each independent support grid 1 has two support rods 4 at its lower part. These are used to temporarily support the independent support grids 1. After the cylindrical body 9 is welded and shaped, the support rods 4 can be removed using an angle grinder as needed to ensure that the inner wall of the cylindrical body 9 is flat.

[0022] The support frame 2 is provided with diagonal braces 6 at its four corners. These braces enhance the strength of the support frame 2 and facilitate the smooth transmission of forces applied during the calibration process. The support bonding plate 3 is equipped with a buffer pad 7 made of rubber. The support bonding plate 3 is bonded to the cylinder body 9 via the buffer pad 7. The buffer pad 7 facilitates the fitting of minor indentations in the cylinder body 9 and also reduces material friction damage and noise during calibration. The buffer pad 7 is an optional accessory; it can be omitted when the calibration force is large.

[0023] The support frame 2 is welded to the support bonding plate 3 along the center line, with the side end of the support bonding plate 3 being a free end. Threaded holes are formed on the support frame 2, and adjusting bolts 8 are threaded onto these holes. The adjusting bolts 8 extend out of the support frame 2, with their ends fitting against the free end of the support bonding plate 3. The position of the free end of the support bonding plate 3 is adjusted by extending the adjusting bolts 8. The free end can be finely adjusted for individual repair of local surface pits and depressions. The support frame 2 has multiple threaded holes and adjusting bolts 8, each adjusting bolt 8 serving as a position adjustment point. The position of the free end of the support bonding plate 3 at each node is adjusted by adjusting the adjusting bolts 8. Three-dimensional repair of the cylinder is achieved through multi-point repair. The thickness of the support bonding plate 3 is 15-20mm; the diameter of the cylinder 9 is greater than 10mm, and the wall thickness of the cylinder 9 is 10-15mm. Multiple sets of single-layer support components are provided, arranged layer by layer along the height direction of the cylinder 9. The tightening force of the jacks is not less than 5 tons.

[0024] In use, the independent support grids 1 are arranged end to end inside the cylinder, and the outer edge of the support plate 3 is fitted with the cylinder body 9. Jacks 5 extend and support the head and tail ends of the single-layer support assembly, which fits snugly against the cylinder body 9. The single-layer support assembly effectively corrects the roundness of the cylinder and avoids natural deformation caused by welding heat input during welding operations, keeping deformation within an acceptable range. The cylinder body 9 can be calibrated by stacking the support grids layer by layer as needed.

Claims

1. A welding and straightening device for large thin-walled cylindrical containers, characterized in that... It includes an independent support grid (1) and a jack (5). The independent support grid (1) is arc-shaped. The independent support grid (1) includes a support frame (2) and a support fitting plate (3). The support frame (2) and the support fitting plate (3) are made of steel. The support fitting plate (3) is located on the side of the support frame (2) and fits the cylinder body (9). There are multiple independent support grids (1). Multiple independent support grids (1) are spliced ​​end to end and evenly distributed along the circumference of the cylinder body (9) to form a single-layer support component. The jack (5) extends and supports the head and tail ends of the single-layer support component. The single-layer support component fits the support cylinder body (9).

2. The welding and straightening device for a large thin-walled cylindrical container according to claim 1, characterized in that... The cylinder body (9) is provided with multiple support rods (4), and independent support grids (1) are placed on the support rods (4). Each independent support grid (1) has two support rods (4) at its lower part.

3. The welding and straightening device for a large thin-walled cylindrical container according to claim 1, characterized in that... The support frame (2) is provided with diagonal bracing (6) at the four corners.

4. The welding and straightening device for a large thin-walled cylindrical container according to claim 1, characterized in that... The support bonding plate (3) is provided with a buffer pad (7), which is made of rubber. The support bonding plate (3) is bonded to the cylinder body (9) through the buffer pad (7).

5. The welding and straightening device for a large thin-walled cylindrical container according to claim 1, characterized in that... The support frame (2) and the support bonding plate (3) are welded along the midline. The side end of the support bonding plate (3) is a free end. A threaded hole is opened on the support frame (2), and an adjusting bolt (8) is threadedly connected to the threaded hole. The adjusting bolt (8) extends out of the support frame (2), and the end of the adjusting bolt (8) is attached to the free end of the support bonding plate (3). The position of the free end of the support bonding plate (3) is adjusted by the extension of the adjusting bolt (8).

6. The welding and straightening device for a large thin-walled cylindrical container according to claim 5, characterized in that... The support frame (2) is provided with multiple threaded holes and adjusting bolts (8). Each adjusting bolt (8) is a position adjustment point. The position of the free end of the support plate (3) on each node is adjusted by adjusting the adjusting bolts (8).

7. The welding and straightening device for a large thin-walled cylindrical container according to claim 1, characterized in that... The thickness of the supporting bonding plate (3) is 15-20mm; the diameter of the cylinder (9) is greater than 10m, and the wall thickness of the cylinder (9) is 10-15mm.

8. The welding and straightening device for a large thin-walled cylindrical container according to claim 1, characterized in that... The single-layer support assembly is provided in multiple sets, and is arranged layer by layer along the height direction of the cylinder (9).

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