Variable-diameter multifunctional thin-wall cylinder supporting and rounding device

Abstract

The application discloses a variable-diameter multifunctional thin-wall cylinder supporting and rounding device and a using method thereof. The device comprises n arc plates which can be connected into a ring or an approximate ring body; and m supporting and topping assemblies which are arranged on at least one arc plate and can rotate on the plane along the arc plate, and are used for supporting and rounding the thin-wall cylinder, wherein n is an integer greater than or equal to 2, and m is an integer greater than or equal to 1. The supporting and rounding device can be widely applied to supporting and rounding of thin-wall cylinders with different diameters by adjusting the number of the arc plates; meanwhile, the supporting and topping assemblies can be used to realize the functions of overall supporting and rounding of the inner side or the outer side of the thin-wall cylinder, and accurate adjustment of the butt joint and the misaligned edges of the thin-wall cylinder.

Description

Technical Field

[0001] This invention relates to the field of pressure vessel manufacturing, and in particular to a variable-diameter multifunctional thin-walled cylindrical support device and its usage method. Background Technology

[0002] In pressure vessel manufacturing, thin-walled cylindrical bodies are widely used as non-pressure-bearing components such as external skirts and internal sleeves. The roundness of these thin-walled cylindrical bodies is a crucial factor affecting their performance. Due to internal stress caused by plastic deformation, thin-walled cylindrical bodies often have openings and notches designed into their walls and ends to facilitate welding or prevent interference, depending on the equipment's structural requirements. After processing, the strength of the thin-walled cylindrical body ends decreases, making them unable to resist the release of internal stress and resulting in poor roundness. When welding parts to the ends of thin-walled cylindrical bodies, the thermal shrinkage caused by welding also leads to a reduction in the diameter and ellipticalization of the ends, affecting the butt welding of the thin-walled cylindrical body to other parts.

[0003] Currently, the most common method is to install or weld an annular anti-deformation ring that fits tightly against the cylinder wall on the inner or outer wall of the thin-walled cylinder to maintain its roundness. However, this method has many problems: (1) Thin-walled cylinders come in a variety of diameters, and the manufacturing of anti-deformation rings will consume a lot of steel. In addition, as the quantity increases, storage and handling will occupy a large area of ​​space, increasing manufacturing costs. (2) The anti-deformation ring needs to be welded to the thin-walled cylinder to ensure that it always fits the thin-walled cylinder and prevents it from tipping over inside the cylinder. However, welding will have a certain impact on the surface of the thin-walled cylinder. When the anti-deformation ring is subjected to a large force, there is a quality risk of cracking at the welding position, which will cause damage to the thin-walled cylinder. (3) Before installing the anti-deformation ring, the installation position needs to be adjusted to be round in advance. However, when the large thin-walled cylinder is placed horizontally, the roundness is difficult to control due to its own weight, and the adjustment is difficult, time-consuming and laborious. (4) In order to make the anti-deformation ring work well, the installation position is usually required to be as close as possible to the end of the thin-walled cylinder. When welding the butt joint of the thin-walled cylinder, the installation position and space of the anti-deformation ring will hinder the operator from welding, grinding and flaw detection, and the mobility is poor.

[0004] In summary, the roundness of thin-walled cylinders is difficult to control and adjust during manufacturing, and there is an urgent need for an efficient and simple device for rounding thin-walled cylinders. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a variable-diameter multifunctional thin-walled cylindrical support device and its usage method.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a variable-diameter multifunctional thin-walled cylindrical support device, comprising: n arc plates can be connected to form a circular ring or an approximate ring; m supporting components are arranged on at least one arc plate and are rotatable along the plane of the arc plate to support the thin-walled cylinder, where n is an integer greater than or equal to 2 and m is an integer greater than or equal to 1.

[0007] In a second aspect, the present invention provides a method of using the variable-diameter multifunctional thin-walled cylindrical support device of the first aspect, comprising: Place the support device at the support position of the thin-walled cylinder, and adjust m support components to make the pad fit against the thin-walled cylinder.

[0008] Before placing the supporting device at the supporting position of the thin-walled cylinder, the method further includes: The value of n for the arc plate is selected based on the diameter of the thin-walled cylinder and the direction of the circular expansion, and the n arc plates are connected. Adjust the circular direction of m supporting components and connect them to the arc plate; Install the pad to complete the assembly of the support device.

[0009] The beneficial effects of the variable-diameter multifunctional thin-walled cylindrical body expansion device and its usage method of the present invention include: (1) The circular support device of the present invention can be widely used to support thin-walled cylinders of different diameters by adjusting the number of arc plates; (2) The rounding device of the present invention can achieve the functions of rounding the inner or outer side of the thin-walled cylinder and precisely adjusting the misalignment of the thin-walled cylinder by using the top support component; (3) The rounding device of the present invention can always round and reverse deformation adjustment around the weld during the welding process, effectively controlling the roundness of the thin-walled cylinder after welding. (4) The supporting device of the present invention is flexible in use. The supporting components can be selectively installed and supported according to the thin-walled cylindrical structure. The supporting components and the pad can be replaced according to actual needs. (5) The support device of the present invention is easy to install and disassemble. Each support point and the thin-walled cylinder are mechanically fixed, thereby avoiding the adverse effects of welding fixation. (6) The rounding device of the present invention uses jacks as power and can replace jacks of different specifications according to the thickness of the thin-walled cylinder to increase the supporting torque. The circumferential adjustment positions are dense, the adjustment accuracy is high, and the rounding effect is significant. Attached Figure Description

[0010] Figure 1 A three-dimensional schematic diagram of the circular support device of the present invention is shown; Figure 2 This diagram shows a front view of the circular support device of the present invention; Figure 3 Show Figure 2 Schematic diagram of the AA section; Figure 4 Show Figure 2 Schematic diagram of the BB section; Figure 5 A schematic diagram of the arc plate structure is shown; Figure 6 A schematic diagram of the support structure is shown; Figure 7 A schematic diagram of the pad structure is shown; Figure 8 The diagram shows the connection structure of 6-piece, 8-piece, and 10-piece arc panels. Figure 9 This diagram illustrates the application range of the circular support device of the present invention to thin-walled cylinders. Figure 10 This shows a schematic diagram of the outer side of the cylinder in Embodiment 1. Figure 11 This shows a schematic diagram of the inner side of the cylinder in Embodiment 2. Figure 12 This diagram illustrates the adjustment of misaligned edges during cylinder docking in Embodiment 3. Figure label: 1-Arc plate, 11-Connecting hole, 12-Positioning pin hole, 121-6-Assembled positioning pin hole, 122-8-Assembled positioning pin hole, 123-10-Assembled positioning pin hole, 13-Center hole, 2-Support assembly, 21-Support, 211-Center shaft connecting hole, 212-Fixing bolt connecting hole, 213-Locking bolt connecting hole, 22-Center shaft, 23-Jack, 24-Locking plate, 25-Fixing bolt, 26-Locking bolt, 3-Positioning pin, 4-Connecting bolt, 5-Plate, 51-Convex pad, 52-Concave pad, 6-Lower end cap, 7-Supporting device, 8-Skirt seat cylinder, 9-Outer cylinder, 10-Connecting plate, 101-Inner sleeve, 102-Upper cylinder, 103-Lower cylinder. Detailed Implementation

[0011] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0012] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0013] Currently, anti-deformation rings are generally used as the support device for thin-walled cylinders, but anti-deformation rings have many problems in terms of quality and cost.

[0014] Therefore, this invention provides a variable-diameter, multi-functional thin-walled cylinder rounding device and its usage method. The rounding device includes n arc plates and m support components, wherein the m support components are disposed on at least one arc plate and are rotatable along the plane of the arc plate. This rounding device, through the support components, can achieve high-precision rounding of the thin-walled cylinder at multiple points in the circumferential direction. Furthermore, by adjusting the number of arc plates, it is suitable for thin-walled cylinders with different diameter ranges, while simultaneously achieving precise adjustment of misaligned butt joints of the thin-walled cylinder and controlling welding shrinkage deformation.

[0015] In a first aspect, the present invention provides a variable-diameter, multifunctional thin-walled cylindrical body shaping device. For example... Figures 1-9 As shown, the supporting device can mainly include: n arc plates 1 and m supporting components 2, where n is an integer greater than or equal to 2 and m is an integer greater than or equal to 1.

[0016] In this invention, the arc plate 1 is selected from a regular arc-shaped steel plate. n arc plates can be connected to form a ring or a near-ring.

[0017] Preferably, n is greater than or equal to 4, more preferably, n is greater than or equal to 6, for example n=6, 7, 8, 9 or 10, and further n=6, 8 or 10, so as to satisfy the rounding of the thin-walled cylinder within different diameter ranges.

[0018] like Figure 4 , 5 As shown, one end of the arc plate 1 may have a boss structure, and the other end may have a cavity structure, so that the boss structure at one end of one arc plate 1 can be inserted into the cavity structure at one end of the next arc plate 1 to achieve a fixed connection between the two arc plates 1. Preferably, the size of the cavity structure is greater than or equal to the size of the boss structure, and more preferably, the size of the cavity structure is equal to the size of the boss structure, so that the two arc plates 1 can fit tightly together.

[0019] More preferably, in order to increase the rigidity of the arc plate 1, the thickness of the arc plate at the end with the cavity structure can be increased, that is, the arc plate 1 with the cavity structure can have a protrusion structure.

[0020] In this invention, the arc plate 1 is provided with an arc plate connecting hole 11. The arc plate connecting hole 11 is used to connect n arc plates 1. Preferably, two arc plate connecting holes 11 are provided on one arc plate 1, that is, one arc plate connecting hole 11 on one arc plate 1 is connected to one arc plate connecting hole 11 on the next arc plate 1, and so on, so that n arc plates 1 are finally connected to form a ring or an approximate ring.

[0021] Preferably, the arc plate connecting holes 11 can be symmetrically distributed at both ends of the arc plate 1, thereby minimizing the number of arc plates 1.

[0022] like Figure 4 As shown, the arc plate connecting holes 11 are respectively provided on the cavity structure at one end of the arc plate 1 and the boss structure at the other end. That is, after the boss structure at one end of one arc plate 1 is inserted into the cavity structure at one end of the next arc plate 1, there is no misalignment of the arc plate connecting holes 11.

[0023] Preferably, the centripetal angle α of the arc plate connecting holes 11 at both ends of an arc plate 1 is 30°~60°, more preferably 45°. In this way, when n=8, adding or removing one or two arc plates 1 (i.e., n=8±2) can still connect the arc plates 1 into a ring or an approximate ring.

[0024] In this invention, the circular support device further includes connecting bolts 4, which are used to connect and fix the n arc plates 1 accordingly. Specifically, the connecting bolts 4 pass through an arc plate connecting hole 11 of one arc plate 1 and an arc plate connecting hole 11 of the next arc plate 1, connecting the two arc plates 1 accordingly.

[0025] There are 2n connecting bolts 4. The two arc plates 1 are connected in sequence by connecting bolts 4, so as to finally connect them into a ring or an approximate ring.

[0026] In this invention, positioning pin holes 12 may also be provided at both ends of the arc plate 1. The positioning pin holes 12 are used for circumferential positioning of the arc plate 1. Preferably, the positioning pin holes 12 are adjacent to the arc plate connecting holes 11. More preferably, the positioning pin holes 12 at one end of the arc plate 1 are located on the outer side of the arc plate connecting holes 11, and the positioning pin holes 12 at the other end of the arc plate 1 are located on the inner side of the arc plate connecting holes 11, wherein the part closer to the edge of the arc plate 1 is the outer side, and the part opposite to it is the inner side.

[0027] The number of locating pin holes 12 at each end is at least two, so that the circumferential positioning of the arc plate 1 can still be achieved when the number of arc plates 1 changes. The at least two locating pin holes 12 are located on a concentric circle with the arc plate connecting hole 11.

[0028] More preferably, each end has three positioning pin holes 12, specifically including 6-piece positioning pin holes 121 (i.e., positioning pin holes corresponding to the connection of 6 arc plates 1), 8-piece positioning pin holes 122 (i.e., positioning pin holes corresponding to the connection of 8 arc plates 1), and 10-piece positioning pin holes 123 (i.e., positioning pin holes corresponding to the connection of 10 arc plates 1). Positioning pin holes 121~123 correspond to the connection and positioning of 6, 8, and 10 arc plates 1, respectively. During the production process, the positioning pin holes can be machined according to the specifications of the arc plates 1.

[0029] By setting different positioning pin holes, different numbers of arc plates 1 can be accurately positioned in the circumferential direction.

[0030] In this invention, the supporting device also includes a positioning pin 3, which cooperates with the positioning pin hole 12 to perform circumferential positioning of the arc plate 1.

[0031] Specifically, when n arc plates 1 are connected into a ring or near-ring body by connecting bolts 4, and positioning pins 3 are installed in the corresponding positioning pin holes 12 for positioning, the entire ring or near-ring body is rigidly fixed.

[0032] In this invention, a central hole 13 may be provided on the arc plate 1. The central hole 13 is used to connect with the support assembly 2. The number of central holes 13 on each arc plate 1 may correspond to the number of support assemblies 2 connected to the corresponding arc plate 1.

[0033] In this invention, m supporting components 2 are arranged on at least one arc plate 1 and are rotatable along the plane of the arc plate 1 (along the central hole 13 of the arc plate 1) to round the thin-walled cylinder.

[0034] Where n can be greater than m, equal to m, or less than m.

[0035] For example, m supporting components 2 can be set on one arc plate 1, or m supporting components 2 can be set on different arc plates 1, depending on the length (or diameter) of the arc plate 1 or the actual roundness requirements of the thin-walled cylinder.

[0036] For example, when n=6 and m=10, all 10 supporting components 2 are set on one arc plate 1, or 3 supporting components 2 are set on one arc plate 1 and the remaining 7 supporting components 2 are set on another arc plate 1; or 5 supporting components 2 are set on 2 arc plates 1 respectively.

[0037] Preferably, m is greater than or equal to n; more preferably, m is greater than n; for example, m is an integer multiple of n. The specific value of the integer multiple is set according to the length (or diameter) of the arc plate 1 or the actual roundness requirement of the thin-walled cylinder. The present invention does not impose a specific limitation, such as 2 to 3 times.

[0038] Furthermore, each arc plate 1 is uniformly provided with an integer multiple of supporting components 2, which is beneficial to obtaining a thin-walled cylinder with precise roundness.

[0039] For example, when n=6, m=12, and two support components 2 are set on each arc plate 1.

[0040] In a preferred embodiment of the present invention, each supporting component 2 may include: A support 21, which is L-shaped, is connected to the arc plate 1.

[0041] Preferably, the support 21 is an "L"-shaped steel plate.

[0042] In this invention, the support assembly 2 may further include a central shaft 22, which is used to connect the support 21 and the arc plate 1, and to rotate the support assembly 2 through the central shaft 22.

[0043] Preferably, the side wall of the support 21 is provided with a central shaft connecting hole 211, and the arc plate 1 is provided with a central hole 13. The support assembly 2 is fixed on the arc plate 1 by passing the central shaft 22 through the central shaft connecting hole 211 and the central hole 13.

[0044] A jack 23 is mounted on a support 21 and is used to round the thin-walled cylinder.

[0045] The bottom of the support 21 can be circular, square, or a combination of semicircle and square, depending on the shape and weight of the bottom of the jack 23.

[0046] In this invention, the support assembly 2 also includes at least one fixing bolt 25, which is used to fix the jack 23 and the support 21.

[0047] Preferably, the bottom of the support 21 is provided with at least one fixing bolt connection hole 212, and more preferably four. The four fixing bolt connection holes 212 can be evenly distributed and are generally circular. The bottom of the jack 23 is also provided with corresponding fixing bolt connection holes. By installing fixing bolts 25 into the fixing bolt connection holes, the jack 23 and the support 21 are fixedly connected.

[0048] Specifically, when the jack 23 is fully extended (also called supporting the top), the support 21 remains relatively stable with the arc plate 1 through the central shaft 22.

[0049] Among them, different sizes of jacks 23 can be selected according to the thin-walled cylinder structure and roundness requirements.

[0050] In another preferred embodiment of the invention, such as Figure 3 As shown, each support component 2 may include: Two supports 21, both L-shaped, are symmetrically arranged along the cross-section of the arc plate 1 and connected to the arc plate 1. The cross-section refers to the direction perpendicular to the plane of the arc plate 1.

[0051] Preferably, the support 21 is an "L"-shaped steel plate.

[0052] In this invention, the support assembly 2 may also include a central shaft 22, which is used to fix the two supports 21 and the arc plate 1 together, and is the rotation axis of the support assembly 2, that is, the support assembly 2 can rotate through the central shaft 22.

[0053] Preferably, each support 21 has a central shaft connection hole 211 on its side wall, and the arc plate 1 has a central hole 13. The support assembly 2 is fixed to the arc plate 1 by passing the central shaft 22 through the two central shaft connection holes 211 and the central hole 13.

[0054] Two jacks 23 are respectively set on two supports 21 and are used to round the thin-walled cylinder.

[0055] In this invention, the support assembly 2 also includes at least two fixing bolts 25, which are used to fix the two jacks 23 and the two supports 21 respectively.

[0056] Preferably, each support 21 has at least one fixing bolt connection hole 212 at its bottom, and more preferably four. The four fixing bolt connection holes 212 can be evenly distributed and are generally circular. Each jack 23 also has a corresponding fixing bolt connection hole at its bottom. By installing fixing bolts 25 into the fixing bolt connection holes, the jack 23 and the support 21 are fixedly connected.

[0057] Specifically, when the jack 23 is fully expanded, the support 21 remains relatively stable with the arc plate 1 through the central shaft 22.

[0058] In this preferred embodiment, the support assembly 2 further includes at least one locking plate 24, which is disposed at the bottom of the two supports 21 for fixing the two supports 21 together.

[0059] The locking plate 24 ensures that the two jacks 23 are in the same direction of expansion and provides a good rigid connection, preventing the support 21 from being deformed due to excessive force when expanding.

[0060] The locking plate 24 can be a single layer or multiple layers, such as two or three layers. When the locking plate 24 has multiple layers, it is preferable that the multiple locking plates 24 have the same structure and fit tightly together, so as to prevent the two jacks 23 from squeezing and deforming the locking plate 24, which is more conducive to the accurate rounding of the support assembly 2.

[0061] Preferably, the support assembly 2 further includes at least two locking bolts 26 for fixing the locking plate 24 to the two supports 21 respectively.

[0062] Specifically, the bottom of the support 21 is provided with at least one locking bolt connection hole 213, preferably one, two or four. The bottom of the locking plate 24 is provided with at least two locking bolt connection holes. By installing the corresponding number of locking bolts 26 into the locking bolt connection holes, the locking plate 24 and the two supports 21 are fixedly connected.

[0063] In this preferred embodiment, the central shaft 22 passes through the central hole 13 and is connected to the two supports 21. After the two supports 21 are fixedly connected to the locking plate 24, the two jacks 23 have the same direction of expansion. At this time, the support assembly 2 is restricted by the relative position of the locking plate 24 and the arc plate 1 and cannot rotate within a large angle range. This prevents the support assembly 2 from rotating on the arc plate 1 during the lifting and flipping process of the expansion device, thereby changing the direction of expansion and causing collisions.

[0064] In this invention, the supporting device further includes a pad 5, which is disposed at the end of the supporting assembly 2 to increase the contact area between the supporting assembly 2 and the thin-walled cylinder. Preferably, the pad 5 is disposed at the end of the jack 23, and more preferably, the pad 5 covers the end of the jack 23.

[0065] In this invention, the pad 5 can be manufactured and replaced according to the material requirements of the thin-walled cylinder and to prevent indentations when expanding the cylinder. For example, the material of the pad 5 can be hard alloy steel, stainless steel, aluminum, nylon, rubber, etc.

[0066] Preferably, the arc R of the pad 5 is the same as the arc surface of the thin-walled cylinder, and the width of the pad 5 is selected according to the diameter of the thin-walled cylinder, thereby improving the roundness of the support assembly 2.

[0067] Preferably, the pad 5 includes a convex pad 51 and a concave pad 52. When it is necessary to expand the inner side of the thin-walled cylinder to a round shape (expand outward), the convex pad 51 is selected; when it is necessary to expand the outer side of the thin-walled cylinder to a round shape (expand inward), the concave pad 52 is selected.

[0068] In this invention, the pad 5 can increase the contact area between the support assembly 2 and the thin-walled cylinder, ensuring the stability of the support device and the thin-walled cylinder after rounding and improving the overall roundness of the thin-walled cylinder.

[0069] In this invention, the rounding device can not only round the inner and outer sides of the thin-walled cylinder as a whole, but also precisely adjust the misaligned edges of the thin-walled cylinder. Simultaneously, during the welding process of the thin-walled cylinder, the rounding device continuously rounds and adjusts the deformation around the weld, thereby effectively controlling the roundness of the thin-walled cylinder after welding.

[0070] In this invention, such as Figure 9 As shown, when the thin-walled cylinder is a Class I or Class II nuclear pressure vessel, the supporting device can meet the requirements of a maximum supporting diameter D=3700mm and a minimum supporting diameter d=1300mm.

[0071] Secondly, the present invention provides a method for using the variable-diameter multifunctional thin-walled cylindrical support device of the first aspect. This method mainly includes: S101. Place the support device at the support position of the thin-walled cylinder, and adjust m support components to make the pad fit against the thin-walled cylinder.

[0072] In this invention, the method further includes the following steps before step S101: S100-1. Select the value of n for arc plate 1 according to the diameter of the thin-walled cylinder and the direction of the circular expansion, and connect the n arc plates 1.

[0073] In this step, the arc plate 1 has corresponding arc plate connecting holes 11 and positioning pin holes 12. The n arc plates 1 are fixedly connected in sequence by connecting bolts 4 and positioning pins 3.

[0074] S100-2. Adjust the support circular direction of m support components 2 and connect them to the arc plate 1.

[0075] In this step, it is preferable that m is an integer multiple of n, and each arc plate 1 is uniformly provided with an integer multiple of the supporting components 2, which is beneficial to obtaining a thin-walled cylinder with precise roundness.

[0076] In this step, the support assembly 2 is fixedly connected to the arc plate 1 and can rotate along the plane of the arc plate 1.

[0077] S100-3, Install pad 5 to complete the assembly of the support device.

[0078] In this step, the pad 5 is placed on the support assembly 2, and the type of pad 5 (convex pad 51 and concave pad 52) is selected according to the support direction.

[0079] In this step, the assembled support device is smoothly lifted and transported to the support position of the thin-walled cylinder, and the support top component 2 is adjusted circumferentially to ensure that the pad 5 is in close contact with the thin-walled cylinder, so as to achieve uniform overall support of the thin-walled cylinder.

[0080] In this invention, the method of use may further include: S102. When there are defects in the thin-walled cylinder, the defects are rounded by adjusting the corresponding support component 2.

[0081] In this step, the defects are mainly that the thin-walled cylinder is elliptical, or there are local bulges, depressions, or welding shrinkage deformation. The defective area can be rounded by adjusting the support assembly 2.

[0082] In this invention, the method of use may further include: S103. After the thin-walled cylinder is rounded, adjust the jack and remove the rounding support device.

[0083] In this invention, the method of use is simple to operate, can adapt to different needs of thin-walled cylinders, and has a wide range of applications.

[0084] To further understand the present invention, the circular support device provided by the present invention will be described below with reference to the embodiments. The scope of protection of the present invention is not limited by the following embodiments. Example

[0085] Example 1 The safety injection tank for the nuclear island equipment in a pressurized water reactor nuclear power plant is a vertical Class I nuclear pressure vessel. After the lower head 6 is welded to the connecting pipe, it is vertically butted into the skirt support cylinder 8. The butt weld requires a gap of 0-2mm. The skirt support cylinder 8 has an outer diameter of 1800mm and a thickness of 30mm, with a notch at the end to avoid the connecting pipe. Due to the welding of the skirt support cylinder 8 to multiple parts, there is significant stress within the skirt support cylinder 8. After the notch is opened, the roundness of the end of the skirt support cylinder 8 deteriorates, and the gap with the lower head 6 reaches 8mm in some areas, which does not meet the welding requirements with the lower head 6. The rounding device 7 of this invention can be used to adjust the welding gap to meet the welding requirements. The specific operation is as follows: (1) After the skirt base cylinder 8 is manufactured, it is placed upright on the reference platform, and the supporting round device 7 is placed as follows. Figure 10 The horizontal lifting and installation of the skirt support cylinder 8 is shown. The jack is adjusted to extend the concave pad against the outer wall of the skirt support cylinder 8 and fixed thereto. (2) Remove the lifting straps, lift the lower end cap 6, and slowly lower it to the skirt support cylinder 8. When it is installed in place, observe the gap between the end of the skirt support cylinder 8 and the outer wall of the lower end cap 6. At this time, the gap at the notch position is relatively large. Adjust the jack to round the position inward until the gap is <2mm, so that it meets the welding requirements. (3) Then begin welding the weld between the lower head 6 and the skirt cylinder 8. After welding 1-2 layers to ensure that the two parts are firmly welded, loosen the jack, lift it horizontally and move it out to complete the smooth connection between the lower head 6 and the skirt cylinder 8.

[0086] Example 2 After the inner sleeve 101 of the steam generator, a main equipment of a pressurized water reactor nuclear power plant, is manufactured, it is coaxially fitted with the outer cylinder 9. The inner diameter of the inner sleeve 101 is 3100mm, the diameter tolerance is ±5mm, and the wall thickness is 14mm. The end of the inner sleeve 101 has 16 evenly distributed notches circumferentially, which are welded to the inner wall of the outer cylinder 9 by 16 evenly distributed connecting plates 10. The welding between the inner sleeve 101 and the connecting plates 10 is relatively large, and shrinkage occurs after welding, causing the arc segment between each notch at the end to deform due to shrinkage, affecting the roundness of the end. The rounding device 7 of this invention can effectively ensure the roundness of the end and suppress welding shrinkage deformation. The specific implementation is as follows: (1) After the inner sleeve 101 is sent to the outer cylinder 9, the coaxiality is adjusted. After all the installation dimensions are qualified, the weld between the inner sleeve 101 and the connecting plate 10 is fixed by multi-point spot welding. (2) Place the supporting device 7 as shown in the figure. Figure 11 The cantilever beam is used to vertically transport the inner sleeve 101 to the inner end. The jack is adjusted so that the convex pad is against the arc segment between each notch and the fit is observed and confirmed to be good. After it is confirmed that the rounding device 7 is fixed to the end of the inner sleeve 101, the jack is used with a torque of 50 Nm to round out each arc of the inner sleeve 101. Then the first layer weld between the inner sleeve 101 and the connecting plate 10 is started. (3) After the first layer of weld is welded, continue to use a torque of 60~80Nm to adjust the jack to over-round outwards until the end diameter increases by 3~5mm. The purpose is to prevent springback after welding and to perform reverse deformation rounding during the welding process. Continue welding until all the welds between the inner sleeve 101 and the connecting plate 10 are filled. (4) After the weld has cooled, loosen all the jacks and remove the support device 7. Measure the diameter of the end of the inner sleeve 101 cylinder, which is 3098~3102mm, which meets the requirements.

[0087] Example 3 The oil storage tank in a certain project is a large, vertical, thin-walled cylinder with an outer diameter of 3600 mm and a wall thickness of 8 mm. The circumferential misalignment during cylinder assembly must not exceed 2 mm. Due to the large diameter and small thickness, the roundness after rolling is poor, making it difficult to guarantee the required misalignment during assembly. The rounding device 7 of this invention can effectively adjust the misalignment. The specific operation is as follows: (1) Place the lower cylinder 103 vertically on the platform, and place the supporting device 7 as shown in the figure. Figure 12 The horizontal lifting mechanism is slowly lowered into the lower cylinder 103 to one side until the jack just enters the end of the lower cylinder 103. Then, the lower jack is adjusted to extend and round the lower cylinder 103, and the rounding device 7 is fixed to the lower cylinder 103. (2) Slowly lower the upper cylinder 102 and adjust it to a suitable welding gap with the lower cylinder 103. Start adjusting the upper jack to extend and round the upper cylinder 102, and observe the circumferential misalignment with the lower cylinder 103 and adjust it to within 2mm to meet the manufacturing standards and welding requirements. (3) Then weld the circumferential seam of the upper cylinder 102 and the lower cylinder 103. The rounding device 7 always rounds the two sides of the weld to prevent the weld from collapsing inward due to heat. (4) After welding is completed, lift the support device 7 smoothly, retract all the jacks and remove the support device 7 from the cylinder to complete the good connection of the upper cylinder 102 and the lower cylinder 103.

[0088] The present invention has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the present invention, and all such modifications and improvements fall within the scope of the present invention.

Claims

1. A variable-diameter, multi-functional thin-walled cylindrical body expansion device, characterized in that, include: n arc plates, which can be connected to form a circular ring or a near-ring, with a central hole on each arc plate; m supporting components are arranged on at least one arc plate to support the thin-walled cylinder in a circular shape, where n is an integer greater than or equal to 2 and m is an integer greater than or equal to 1; The supporting assembly includes: Two supports, both L-shaped, are symmetrically arranged along both sides of the arc plate and connected to the arc plate. Each support has a central shaft connection hole on its side wall. Two jacks, each mounted on a separate support, are used to round the thin-walled cylinder. The central shaft is used to fix the support to the arc plate and to serve as the rotation axis for the support assembly. The support assembly is fixed to the arc plate by passing the central shaft through the central shaft connection hole and the central hole. At least one locking plate is set at the bottom of the two supports to fix the two supports together. After the two supports are fixedly connected to the locking plate, the two jacks have the same support direction.

2. The variable-diameter multifunctional thin-walled cylindrical body expansion device according to claim 1, characterized in that, The two ends of the arc plate are provided with positioning pin holes, which are used to circumferentially position the arc plate.

3. The variable-diameter multifunctional thin-walled cylindrical body expansion device according to claim 2, characterized in that, The number of locating pin holes at each end is at least two.

4. The variable-diameter multifunctional thin-walled cylindrical body expansion device according to claim 1, characterized in that, Also includes: A pad is placed at the end of the support assembly to increase the contact area between the support assembly and the thin-walled cylinder.

5. A method of using the variable-diameter multifunctional thin-walled cylindrical body rounding device according to claim 4, characterized in that, include: Place the supporting device at the supporting position of the thin-walled cylinder, and adjust m supporting components to make the pad fit against the thin-walled cylinder.

6. The method of using the variable diameter multifunctional thin-walled cylindrical body rounding device according to claim 5, characterized in that, Before placing the rounding device at the rounding position of the thin-walled cylinder, the method further includes: The value of n for the arc plate is selected based on the diameter of the thin-walled cylinder and the direction of the circular expansion, and the n arc plates are connected. Adjust the circular direction of m supporting components and connect them to the arc plate; Install the mounting plate to complete the assembly of the circular support device.

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