Roundness-adjustable anti-deformation device and method for large-diameter thin-wall metal barrel

Abstract

The invention discloses a roundness-adjustable anti-deformation device and method for a large-diameter thin-wall metal barrel, the device comprises a plurality of groups of anti-deformation rings, the installation number and the installation position can be selected according to specific needs, and lifting lugs are welded on the anti-deformation rings, so that the anti-deformation device has the functions of deformation prevention and lifting turnover; when the anti-deformation device is installed, the roundness of the barrel is adjusted through the roundness adjusting mechanism, it is ensured that the roundness of the barrel meets the design requirement, in addition, the positions and the number of the rib plates for axial rigid connection and fixation of the anti-deformation ring and the barrel can be adjusted in a personalized mode, and it is ensured that dense hole forming areas of the barrel are avoided.

Description

Technical Field

[0001] This invention relates to the field of anti-deformation devices for thin-walled metal cylinders, and in particular to an adjustable roundness anti-deformation device and method for large-diameter thin-walled metal cylinders used in the manufacture of load-bearing cylinders for high-temperature gas-cooled reactor steam generators of advanced fourth-generation nuclear power products. Background Art

[0002] The high-temperature gas-cooled reactor steam generator is an advanced fourth-generation nuclear power reactor technology with advantages such as good safety, high efficiency, and good economy. It is of great significance for environmental protection, energy conservation and emission reduction.

[0003] As a key heat exchange component in high-temperature gas-cooled reactor steam generators, the load-bearing cylinder assembly is characterized by its large diameter, thin walls, and high dimensional accuracy. After the cylinder is rolled and formed, it requires complex manufacturing processes including lifting and transportation, cylinder assembly and welding, dense multi-hole machining, and small-connection welding. Therefore, the manufacturing process must ensure sufficient rigidity of the cylinder and strictly control deformation to ensure that the cylinder dimensions and roundness meet design requirements. Currently, mature anti-deformation tooling for cylinders has the following problems:

[0004] 1. The structure is complex, difficult to disassemble and assemble, cannot be reused, and is not suitable for cylinders that need to be mass-produced;

[0005] Second, the support stability is poor, making it difficult to coordinate with the machining and alignment of the cylinder's holes.

[0006] Third, the support position is fixed and cannot avoid the opening position of the cylinder.

[0007] Therefore, there is an urgent need to design an adjustable roundness anti-deformation device and method to meet the requirements of manufacturing large-diameter thin-walled metal cylinders. Summary of the Invention

[0008] To overcome the above problems, the inventors conducted intensive research and designed an adjustable roundness anti-deformation device and method for large-diameter thin-walled metal cylinders. This device includes multiple sets of anti-deformation rings, the number and location of which can be selected according to specific needs. Lifting lugs are welded onto the anti-deformation rings, enabling the device to function as both anti-deformation and lifting / turning mechanism. During installation, the roundness of the cylinder is adjusted using a roundness adjustment mechanism to ensure it meets design requirements. Furthermore, the position and number of ribs used for the axial rigid connection and fixing of the anti-deformation rings and the cylinder can be individually adjusted to avoid densely perforated areas within the cylinder; thus, the invention is complete.

[0009] Specifically, the purpose of this invention is to provide an adjustable roundness anti-deformation device for a large-diameter thin-walled metal cylinder. The device includes an anti-deformation ring 1 sleeved on the outer wall of the cylinder. Multiple anti-deformation rings are provided and arranged along the height direction of the cylinder, and placed at any position on the cylinder to avoid the opening area of ​​the cylinder.

[0010] The device further includes a roundness adjustment mechanism 2, through which the anti-deformation ring 1 is installed and tightened, so that the anti-deformation ring 1 is pressed against the cylinder body and the roundness of the cylinder body is adjusted.

[0011] Wherein, the anti-deformation ring 1 includes two semi-circular ring plates 3 and two steel plates 4;

[0012] When the two ring plates 3 are tightened by the roundness adjustment mechanism 2, the ends of the two ring plates 3 are adjacent to each other, the ring plates 3 are pressed against the cylinder body and the roundness of the cylinder body is adjusted, the two ends of the steel plate 4 are welded to the two ring plates 3 to form a closed-ring anti-deformation ring 1.

[0013] Wherein, lifting lugs 5 are welded and installed on the ring plate 3, and the cylinder body is lifted by the lifting lugs 2.

[0014] Wherein, on the ring plate 3, a rib plate 6 is arranged on the side close to the cylinder body, the rib plate 6 is fixed on the ring plate 3, and one side of the rib plate 6 abuts against the cylinder body, and the cylinder body is supported and fixed by the rib plate 6.

[0015] Wherein, on the outer side of the anti-deformation ring 1, a channel steel 7 is arranged along the axial direction of the cylinder body, and the channel steel 7 is fixed to multiple anti-deformation rings 1 to fixedly support the anti-deformation ring 1 in the axial direction of the cylinder body.

[0016] Wherein, the roundness adjustment mechanism 2 includes a long hook plate assembly 8, a short hook plate assembly 9 and a jack 10;

[0017] Wherein, the long hook plate assembly 8 is hinged to one of the ring plates 3 in the anti-deformation ring 1, the short hook plate assembly 9 is hinged to the other ring plate 3 in the anti-deformation ring 1, and the two ends of the jack 10 are respectively propped against the long hook plate assembly 8 and the short hook plate assembly 9, and the two ring plates 3 are pulled closer by extending the jack 10, so that the ring plates 3 are pressed against the cylinder body and the roundness of the cylinder body is adjusted.

[0018] Wherein, the long hook plate assembly 8 is integrally in an inverted U shape, and includes a first long cross bar 81, a long longitudinal bar 82 and a second long cross bar 83 which are connected in sequence, wherein, the first long cross bar 81 is hinged to the ring plate 3; the first long cross bar 81 and the second long cross bar 83 are parallel to each other and both are perpendicular to the long longitudinal bar 82;

[0019] The short hook plate assembly 9 is integrally in an L shape, and includes a short longitudinal bar 91 and a short cross bar 92 which are connected in sequence and perpendicular to each other; wherein, the short longitudinal bar 91 is hinged to the ring plate 3; <(

[0020] The second long horizontal bar 83 and the short horizontal bar 92 are parallel to each other, and the two ends of the jack 10 are respectively supported on the second long horizontal bar 83 and the short horizontal bar 92. By extending the jack 10, the distance between the first long horizontal bar 81 and the short horizontal bar 92 is brought closer, thereby bringing the two ring plates 3 in the anti-deformation ring 1 closer.

[0021] The present invention also provides a method for preventing deformation of a large-diameter thin-walled metal cylinder with adjustable roundness, which is achieved by the large-diameter thin-walled metal cylinder with adjustable roundness anti-deformation device described above.

[0022] The method includes the following steps:

[0023] Step 1: Connect the two ring plates 3 on the outside of the cylinder, and arrange a roundness adjustment mechanism 2 on each side of the ring plates 3;

[0024] Step 2: The long hook plate assembly 8 in the roundness adjustment mechanism is hinged to one ring plate 3, and the short hook plate assembly 9 is hinged to another ring plate 3; the two ends of the jack 10 abut against the long hook plate assembly 8 and the short hook plate assembly 9 respectively.

[0025] Step 3: Gradually extend the jack 10 to bring the two ring plates 3 closer together, so that the ring plates 3 are close to the cylinder and the roundness of the cylinder is adjusted.

[0026] Step 4: When the two ring plates 3 are pulled closer to the predetermined degree, the ring plates 3 are circumferentially rigidly fixed by welding the steel plate 4 onto the ring plates 3 to form the anti-deformation ring 1.

[0027] Step 5: Remove the roundness adjustment mechanism 2;

[0028] Step 6: Install ring plates 3 at other parts of the cylinder that need to be fixed, and repeat steps 1 to 5.

[0029] Step 7: Weld channel steel 7 onto multiple anti-deformation rings 1 along the axis of the cylinder to solidify the multiple anti-deformation rings 1 into one piece; weld lifting lugs 2 and stiffening plates 6 onto the ring plate 3.

[0030] In step 2, the short crossbar 92 of the short hook plate assembly 9 is inserted into the long hook plate assembly 8, that is, it is located between the first long crossbar 81 and the second long crossbar 83.

[0031] The beneficial effects of this invention include:

[0032] (1) According to the present invention, the adjustable roundness anti-deformation device and method for large diameter thin-walled metal cylinder is provided. The device adopts a mechanical connection structure, the support position is adjustable, and the number of anti-deformation rings can be adjusted according to the anti-deformation requirements. It is easy to operate, has a good anti-deformation effect, improves the cylinder diameter and cylindricity accuracy, and effectively controls the error of cylinder assembly welding and the overall straightness.

[0033] (2) According to the present invention, the adjustable roundness anti-deformation device and method for large-diameter thin-walled metal cylinder strengthens the rigidity of the cylinder and creates superior conditions for subsequent high-precision multi-hole processing of the cylinder assembly.

[0034] (3) According to the present invention, the adjustable roundness anti-deformation device and method for large-diameter thin-walled metal cylinder solves the problem that traditional anti-deformation tooling is difficult to disassemble and reuse, which greatly improves manufacturing efficiency and reduces manufacturing cost. Attached Figure Description

[0035] Figure 1 A schematic diagram of the overall structure of the large-diameter thin-walled metal cylinder adjustable roundness anti-deformation device provided in this application is shown.

[0036] Figure 2 Show Figure 1 A cross-sectional view along the AA direction, which is a schematic diagram of the assembly process of the anti-deformation ring in the large-diameter thin-walled metal cylinder adjustable roundness anti-deformation device provided in this application.

[0037] Figure 3 Show Figure 2 A magnified view of a portion of region I;

[0038] Figure 4 Show Figure 1 A cross-sectional view along the BB direction, which is a schematic diagram of the anti-deformation ring after assembly in the large-diameter thin-walled metal cylinder adjustable roundness anti-deformation device provided in this application.

[0039] Explanation of reference numerals in the attached figures

[0040] 1-Anti-deformation ring

[0041] 2-Roundness Adjustment Mechanism

[0042] 3-Ring plate

[0043] 4-steel plate

[0044] 5-Hanging lugs

[0045] 6-rib plate

[0046] 7-Channel steel

[0047] 8-Long hook plate assembly

[0048] 81-First Longest Horizontal Bar

[0049] 82-Long Longitudinal Bar

[0050] 83 - Second Longest Crossbar

[0051] 9-Short hook plate assembly

[0052] 91-Short longitudinal bar

[0053] 92-Short crossbar

[0054] 10-jack Detailed Implementation

[0055] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent.

[0056] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0057] This invention provides an adjustable roundness anti-deformation device for large-diameter thin-walled metal cylinders, such as... Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the device includes anti-deformation rings 1 fitted onto the outer wall of the cylinder. Multiple anti-deformation rings are arranged along the height direction of the cylinder; that is, they can be positioned at any location as needed along the height direction of the cylinder, ensuring that the anti-deformation rings 1 avoid the opening area of ​​the cylinder and prevent interference with subsequent opening work. In other words, the multiple anti-deformation rings 1 in this application are independent of each other during the installation phase, exhibiting high adaptability. The number and installation position of the anti-deformation rings 1 can be freely set for different cylinder structures. This allows for a holistic consideration of each processing stage of the cylinder, providing space and structural strength guarantees for subsequent processing during the initial installation of the anti-deformation rings, eliminating the need to readjust the position of the anti-deformation rings 1 during later processing, shortening the processing cycle, and improving efficiency.

[0058] The device also includes a roundness adjustment mechanism 2, which is used to install and tighten the anti-deformation ring 1, so that the anti-deformation ring 1 is close to the cylinder and the roundness of the cylinder is adjusted. Since the anti-deformation ring 1 can be a standard circle, the closer the anti-deformation ring 1 is to the cylinder, the closer the cylinder is to a standard circle, thus improving its roundness.

[0059] In a preferred embodiment, the anti-deformation ring 1 includes two semi-circular ring plates 3 and two steel plates 4;

[0060] When the two ring plates 3 are tightened by the roundness adjustment mechanism 2, with their ends close to each other and the ring plates 3 pressed against the cylinder to adjust the cylinder's roundness, the two ends of the steel plate 4 are welded to the two ring plates 3 to form a closed-loop anti-deformation ring 1. Simply tightening the two ring plates 3 to a predetermined position achieves circumferential rigid fixation through welding the steel plate. In a preferred embodiment, lifting lugs 5 are welded onto the ring plates 3 to lift the cylinder. The number and position of these lugs can be adjusted according to actual usage to accommodate cylinders of different sizes and shapes, ensuring that the cylinder can be lifted and rotated.

[0061] In a preferred embodiment, a stiffening rib 6 is provided on the ring plate 3 near the cylinder. The stiffening rib 6 is fixed to the ring plate 3, and one side of the stiffening rib 6 abuts against the cylinder, providing auxiliary support and fixing to the cylinder. The stiffening ribs are evenly distributed circumferentially on the cylinder, and their position and number can be adjusted to avoid densely perforated areas of the cylinder. By providing the stiffening rib 6, the contact area between the ring plate 3 and the cylinder is increased. During subsequent operations such as hoisting and rotating the cylinder, the ring plate 3 can better support the cylinder, resulting in uniform stress on the cylinder and preventing defects such as marks on the cylinder.

[0062] In a preferred embodiment, a channel steel 7 is provided on the outer side of the anti-deformation ring 1 along the axis of the cylinder. The channel steel 7 is fixed to multiple anti-deformation rings 1 to fix and support the anti-deformation rings 1 in the axis of the cylinder, thus fixing the multiple anti-deformation rings 1 into a whole, making the force on the cylinder more balanced. In addition, by providing the channel steel 7, the anti-deformation rings are prevented from tilting or shifting when the cylinder is placed vertically, further improving the overall connection strength and stability of the anti-deformation device, and adapting to cylinders of any shape.

[0063] In this application, the channel steel 7 is set on the outside of the anti-deformation ring 1, and a predetermined gap is left between the channel steel and the cylinder to facilitate the welding operation between the channel steel and the anti-deformation ring 1. That is, the channel steel 7 and the anti-deformation ring 1 in this application are welded during installation and cut during disassembly, so as to ensure the stability of the installation connection and also take into account the reusability of the anti-deformation device.

[0064] In a preferred embodiment, the roundness adjustment mechanism 2 includes a long hook plate assembly 8, a short hook plate assembly 9, and a jack 10;

[0065] Among them, the long hook plate assembly 8 is hinged to one of the ring plates 3 in the anti-deformation ring 1, and the short hook plate assembly 9 is hinged to the other ring plate 3 in the anti-deformation ring 1. The two ends of the jack 10 respectively support on the long hook plate assembly 8 and the short hook plate assembly 9. By extending the jack 10, the two ring plates 3 are pulled closer, so that the ring plates 3 are tightly attached to the cylinder body and the roundness of the cylinder body is adjusted. Preferably, through holes are provided on the long hook plate assembly 8, the short hook plate assembly 9 and the ring plate 3, and bolts 11 are also provided at the hinge joints. The hinge connection is achieved by the bolts 11 passing through the through holes.

[0066] In this application, the roundness adjustment mechanism 2 is used to tighten the two ring plates 3 to form a complete ring, providing roundness limit for the cylinder body. In the roundness adjustment mechanism 2 of this application, during the tightening process, the着力点 is basically on the ring, and it is tightened by the way of jack lifting, which can ensure the smoothness of the tightening process, the balanced force on the two ring plates 3, and avoid the deformation of the ring plates 3 caused by uneven force during the tightening process, so as to ensure that the two ring plates 3 after tightening can form a standard circle, further improving the roundness of the cylinder body. In addition, by tightening in the way of jack lifting, the adjustment process of the roundness of the cylinder body can also be made smooth, avoiding the formation of indentations on the surface of the cylinder body, so that the final obtained cylinder body structure quality meets the quality requirements of nuclear power equipment.

[0067] Preferably, the long hook plate assembly 8 is integrally in an inverted "U" shape, including a first long cross bar 81, a long vertical bar 82 and a second long cross bar 83 connected in sequence. Among them, the first long cross bar 81 is hinged to the ring plate 3; the first long cross bar 81 and the second long cross bar 83 are parallel to each other and both perpendicular to the long vertical bar 82;

[0068] The short hook plate assembly 9 is integrally in an "L" shape, including a short vertical bar 91 and a short cross bar 92 connected in sequence and perpendicular to each other; among them, the short vertical bar 91 is hinged to the ring plate 3;

[0069] The second long cross bar 83 and the short cross bar 92 are parallel to each other, and the two ends of the jack 10 respectively support on the second long cross bar 83 and the short cross bar 92, and the jack 10 can be temporarily fixed between the second long cross bar 83 and the short cross bar 92; by extending the jack 10, the distance between the first long cross bar 81 and the short cross bar 92 is pulled closer, so as to pull closer the two ring plates 3 in the anti-deformation ring 1.

[0070] In this application, by setting the long hook plate assembly 8 and the short hook plate assembly 9 with the above structures, the force application points on the roundness adjustment mechanism 2 can be close to the annular area of the anti-deformation ring 1, and the force application direction is basically tangent to the annular structure of the roundness adjustment mechanism 2, avoiding the deformation of the ring plates 3 on the roundness adjustment mechanism 2.

[0071] The present invention also provides a method for preventing deformation of a large-diameter thin-walled metal cylinder with adjustable roundness, which is achieved by the large-diameter thin-walled metal cylinder with adjustable roundness anti-deformation device described above.

[0072] Preferably, the method includes the following steps:

[0073] Step 1: Connect the two ring plates 3 on the outside of the cylinder, and arrange a roundness adjustment mechanism 2 on each side of the ring plates 3;

[0074] Step 2: The long hook plate assembly 8 in the roundness adjustment mechanism is hinged to one ring plate 3, and the short hook plate assembly 9 is hinged to another ring plate 3; the two ends of the jack 10 abut against the long hook plate assembly 8 and the short hook plate assembly 9 respectively.

[0075] Step 3: Gradually extend the jack 10 to bring the two ring plates 3 closer together, so that the ring plates 3 are close to the cylinder and the roundness of the cylinder is adjusted.

[0076] Step 4: When the two ring plates 3 are pulled closer to the predetermined degree, the ring plates 3 are circumferentially rigidly fixed by welding the steel plate 4 onto the ring plates 3 to form the anti-deformation ring 1.

[0077] Step 5: Remove the roundness adjustment mechanism 2;

[0078] Step 6: Install ring plates 3 at other parts of the cylinder that need to be fixed, and repeat steps 1 to 5.

[0079] Step 7: Along the axis of the cylinder, weld channel steel 7 onto multiple anti-deformation rings 1 to solidify the multiple anti-deformation rings 1 into one piece, and weld lifting lugs 2 and stiffening plates 6 onto the ring plate 3.

[0080] Preferably, in step 2, the short crossbar 92 of the short hook plate assembly 9 is inserted into the long hook plate assembly 8, that is, located between the first long crossbar 81 and the second long crossbar 83.

[0081] Example

[0082] The large-diameter, thin-walled metal cylinder of the 600MW high-temperature gas-cooled reactor steam generator requires complex manufacturing processes after rolling and forming, including lifting and transportation, docking of multiple cylinders, high-precision dense multi-hole machining, and welding of small connecting pipes. After the cylinder is rolled and formed, it meets the requirements of this application. Figure 1 , Figure 2 , Figure 3 and Figure 4 The large-diameter, thin-walled metal cylinder shown is equipped with an adjustable roundness anti-deformation device for roundness adjustment and anti-deformation treatment. The specific operation process is as follows:

[0083] Step 1: Connect the two ring plates 3 on the outside of the cylinder, and arrange a roundness adjustment mechanism 2 on each side of the ring plates 3;

[0084] Step 2: The long hook plate assembly 8 in the roundness adjustment mechanism is hinged to one ring plate 3, and the short hook plate assembly 9 is hinged to another ring plate 3; the two ends of the jack 10 abut against the long hook plate assembly 8 and the short hook plate assembly 9 respectively.

[0085] Step 3: Gradually extend the jack 10 to bring the two ring plates 3 closer together, so that the ring plates 3 are close to the cylinder and the roundness of the cylinder is adjusted.

[0086] Step 4: When the two ring plates 3 are pulled closer to the predetermined degree, the ring plates 3 are circumferentially rigidly fixed by welding the steel plate 4 onto the ring plates 3 to form the anti-deformation ring 1.

[0087] Step 5: Remove the roundness adjustment mechanism 2;

[0088] Step 6: Install ring plates 3 at other parts of the cylinder that need to be fixed, and repeat steps 1 to 5.

[0089] Step 7: Along the axis of the cylinder, weld channel steel 7 onto multiple anti-deformation rings 1 to solidify the multiple anti-deformation rings 1 into one piece, and weld lifting lugs 2 and stiffening plates 6 onto the ring plate 3.

[0090] After the above roundness adjustment and anti-deformation treatment, the lifting and transportation of the cylinder, the docking of multiple cylinders, the high-precision dense group hole processing, and the welding of small connecting pipes were all successfully carried out. After the completion of the implementation, the roundness of the cylinder was tested and found to meet the technical requirements of nuclear power equipment. After the large-diameter thin-walled metal cylinder adjustable roundness anti-deformation device is removed from the cylinder, the large-diameter thin-walled metal cylinder adjustable roundness anti-deformation device can still be applied to other cylinders, that is, it can be reused.

[0091] The present invention has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present invention based on these embodiments, all of which fall within the scope of protection of the present invention.

Claims

1. A large diameter thin-walled metal cylinder with adjustable roundness anti-deformation device, characterized in that: The device includes anti-deformation rings (1) sleeved on the outer wall of the cylinder body. There are multiple anti-deformation rings arranged along the height direction of the cylinder body and placed at any position of the cylinder body to avoid the opening area of the cylinder body. The device further includes a roundness adjustment mechanism (2). Through the roundness adjustment mechanism (2), the anti-deformation rings (1) are installed and tightened, so that the anti-deformation rings (1) are tightly attached to the cylinder body and the roundness of the cylinder body is adjusted.

2. The adjustable roundness anti-deformation device for a large-diameter thin-walled metal cylinder body according to claim 1, wherein the anti-deformation ring (1) includes two semi-circular ring plates (3) and two steel plates (4); When the two ring plates (3) are tightened by the roundness adjustment mechanism (2), the ends of the two ring plates (3) are adjacent to each other, and the ring plates (3) are tightly attached to the cylinder body and adjust the roundness of the cylinder body, the two ends of the steel plate (4) are welded to the two ring plates (3) to form a closed-ring anti-deformation ring (1).

3. The adjustable roundness anti-deformation device for a large-diameter thin-walled metal cylinder body according to claim 2, wherein lifting lugs (5) are welded and installed on the ring plates (3), and the cylinder body is lifted through the lifting lugs (2).

4. The adjustable roundness anti-deformation device for a large-diameter thin-walled metal cylinder body according to claim 2, wherein on the ring plates (3), a rib plate (6) is arranged on the side close to the cylinder body. The rib plate (6) is fixed on the ring plate (3), and one side of the rib plate (6) abuts against the cylinder body to assist in supporting and fixing the cylinder body through the rib plate (6).

5. The adjustable roundness anti-deformation device for a large-diameter thin-walled metal cylinder body according to claim 2, wherein on the outer side of the anti-deformation ring (1), a channel steel (7) is arranged along the axis direction of the cylinder body. The channel steel (7) is fixed to multiple anti-deformation rings (1) to fixedly support the anti-deformation rings (1) in the axis direction of the cylinder body.

6. The adjustable roundness anti-deformation device for a large-diameter thin-walled metal cylinder body according to claim 2, wherein the roundness adjustment mechanism (2) includes a long hook plate assembly (8), a short hook plate assembly (9) and a jack (10); wherein, the long hook plate assembly (8) is hinged to one ring plate (3) of the anti-deformation ring (1), the short hook plate assembly (9) is hinged to the other ring plate (3) of the anti-deformation ring (1), and the two ends of the jack (10) are respectively propped against the long hook plate assembly (8) and the short hook plate assembly (9). By extending the jack (10), the two ring plates (3) are pulled closer so that the ring plates (3) are tightly attached to the cylinder body and the roundness of the cylinder body is adjusted.

7. The adjustable roundness anti-deformation device for a large-diameter thin-walled metal cylinder body according to claim 6, wherein the long hook plate assembly (8) is integrally in an "L" shape, including a first long cross bar (81), a long vertical bar (82) and a second long cross bar (83) connected in sequence. Among them, the first long cross bar (81) is hinged to the ring plate (3); the first long cross bar (81) and the second long cross bar (83) are parallel to each other and both are perpendicular to the long vertical bar (82); The short hook plate assembly (9) is in an "L" shape as a whole, and comprises a short longitudinal rod (91) and a short transverse rod (92) which are connected in sequence and perpendicular to each other; wherein the short longitudinal rod (91) is hinged to the ring plate (3); The second long cross bar (83) and the short cross bar (92) are parallel to each other, and the two ends of the jack (10) are supported on the second long cross bar (83) and the short cross bar (92) respectively, and the distance between the first long cross bar (81) and the short cross bar (92) is shortened by extending the jack (10), thereby shortening the distance between the two ring plates (3) in the anti-deformation ring (1).

8. A method for preventing deformation of a large-diameter thin-walled metal cylinder with adjustable roundness, characterized in that: The method is realized by the large-diameter thin-walled metal cylinder with adjustable roundness anti-deformation device as described in any one of claims 1 to 7.

9. The method for preventing deformation of a large-diameter thin-walled metal cylinder with adjustable roundness according to claim 8, characterized in that: The method comprises the following steps: Step 1, butting two ring plates (3) together outside the cylinder, and arranging a roundness adjustment mechanism (2) on both sides of the ring plate (3); Step 2, the long hook plate assembly (8) in the roundness adjustment mechanism is hinged to one ring plate (3), and the short hook plate assembly (9) is hinged to the other ring plate (3); the two ends of the jack (10) are respectively abutted against the long hook plate assembly (8) and the short hook plate assembly (9); Step 3, gradually extending the jack (10) to pull the two ring plates (3) closer together, so that the ring plates (3) are close to the cylinder and the roundness of the cylinder is adjusted; Step 4, when the two ring plates (3) are pulled close to a predetermined degree, the ring plates (3) are rigidly fixed in the circumferential direction by welding the steel plates (4) to the ring plates (3), thereby forming an anti-deformation ring (1); Step 5, dismantling the roundness adjustment mechanism (2); Step 6, installing the ring plate (3) at other parts of the cylinder that need to be fixed, and repeating steps 1 to 5; Step 7, welding channel steel (7) on the plurality of anti-deformation rings (1) along the axis direction of the cylinder to consolidate the plurality of anti-deformation rings (1) into one; welding the lifting lugs (2) and rib plates (6) on the ring plate 3.

10. The method for preventing deformation of a large-diameter thin-walled metal cylinder with adjustable roundness according to claim 9, characterized in that: In step 2, the short crossbar (92) of the short hook plate assembly (9) is extended into the long hook plate assembly (8), that is, located between the first long crossbar (81) and the second long crossbar (83).

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