Seamless inner supporting tool for girth welding of skirt shell and using method of seamless inner supporting tool

Abstract

The invention relates to the field of welding tools, and discloses a seamless inner supporting tool for girth welding of a skirt shell and a use method of the seamless inner supporting tool to ensure that the tool can smoothly pass through a small-caliber end socket port of the skirt shell in a contraction state and can be fully unfolded after entering an inner cavity of the shell to form seamless fit support with a large-diameter inner wall. Secondly, roundness correction of the inner wall and the transition section of the shell is achieved through the accurate supporting action, it is guaranteed that the height deviation of a weld joint of the inner wall meets the standard after welding, and the manual polishing procedure is thoroughly omitted; and finally, a temperature control function is integrated, deformation of the transition section due to too high temperature in the welding process is avoided, meanwhile, the automation degree of the tool is improved, the positioning time is shortened, and the production efficiency and the product quality stability are improved.

Description

Technical Field

[0001] This invention relates to the field of welding fixtures, and more specifically to a seamless inner support fixture for circumferential welding of a skirted shell and its method of use. Background Technology

[0002] In the field of welding fixtures, especially in applications involving circumferential welding of shells, different types of shell structures impose diverse requirements on the design of welding fixtures. Taking through shells and skirted shells as examples, there are significant differences in orifice diameter and support requirements. The orifice diameter on through shells is usually larger, so the size of the fixture after tightening does not need to be considered too much when designing the welding fixture. However, because the orifice diameter and the port diameter of skirted shells differ significantly, the design of the welding fixture needs to consider both the smaller size after tightening and the larger support outer diameter after unfolding.

[0003] As a core component in industrial equipment, the skirted shell bears the load and provides connection. Its most significant structural feature is the presence of a small-diameter end cap and a large-diameter inner wall, with a transition section of low stiffness typically between the end cap and the inner wall. This variable-diameter structure makes the tooling adaptability requirements for circumferential welding far higher than for ordinary constant-diameter shells. Currently, the tooling used for welding skirted shells in the industry still suffers from many insurmountable technical defects. Traditional external clamping tooling relies on applying clamping force from the outside of the shell for fixation. If the tooling is designed according to the size of the end cap, it cannot provide stable support for the large-diameter inner wall after entering the shell cavity. During welding, the molten pool on the inner wall collapses under gravity, resulting in a large deviation in weld height. If the tooling is designed according to the inner wall size, the outer diameter of the tooling will be larger than the diameter of the end cap, making it impossible to enter the shell through the small end cap. The skirted shell must be disassembled before welding, but the disassembly and reassembly process introduces additional assembly errors, further reducing welding accuracy. Meanwhile, the external clamping fixture only acts on the outside of the shell and cannot protect the transition section with low rigidity. During the welding process, the transition section is prone to local dents, and the roundness error seriously exceeds the industry standard requirements. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a seamless internal support fixture for circumferential welding of skirted shells and its usage method. Firstly, it ensures that the fixture, in its contracted state, can smoothly pass through the small-diameter end cap port of the skirted shell and fully expand upon entering the shell cavity, forming a seamless support with the large-diameter inner wall. Secondly, precise tightening actions correct the roundness of the shell's inner wall and transition section, ensuring that the weld height deviation of the inner wall meets standards after welding, completely eliminating the need for manual grinding. Finally, it integrates temperature control functions to prevent deformation of the transition section due to excessive temperature during welding, while also improving the automation level of the fixture, shortening positioning time, and enhancing production efficiency and product quality stability.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A seamless inner support fixture for circumferential welding of a skirted shell includes: Short-stroke tensioning components; The large-stroke tensioning assembly includes a retracted state, a preliminary expanded state, and an extended state; A tension rod assembly, one end of which is mounted on the welding host, is used to provide a driving force for switching between a tensioned state and a retracted state; The lifting seat assembly includes a fixed-side lifting assembly and a movable-side lifting assembly. Several sets of linkage assemblies are connected between the fixed-side lifting assembly and the movable-side lifting assembly. Each linkage assembly is used to connect the small-stroke tensioning assembly or the large-stroke tensioning assembly. The short-stroke lifting assembly is used to push out the short-stroke tensioning assembly; A long-stroke lifting assembly is used to eject a long-stroke tensioning assembly, and the ejection height of the short-stroke lifting assembly is less than that of the long-stroke lifting assembly. When the fixed-side lifting assembly and the movable-side lifting assembly are relatively close, the small-stroke tensioning assembly and the large-stroke tensioning assembly first switch from the retracted state to the initial open state. Then, the small-stroke lifting assembly first drives the small-stroke tensioning assembly to tension the shell to be welded. Next, the large-stroke lifting assembly drives the large-stroke tensioning assembly to tension the shell to be welded and switches to the ejected state.

[0007] In this invention, preferably, the lifting seat assembly includes a disc seat, on which a plurality of slides are circumferentially distributed. The slides are used to connect the connecting rod assembly and are slidably connected to the disc seat. The slides are provided with an elastic element and a set screw. The elastic element is used to provide elastic force so that the slide can return to its original position. The set screw is used to adjust the preload between the elastic element and the slides to change the sliding stroke of the slides. The sliding stroke of the slide corresponding to the small stroke tensioning assembly is less than the sliding stroke of the slide corresponding to the large stroke tensioning assembly.

[0008] In this invention, preferably, the small-stroke tensioning component includes a plurality of small-stroke copper blocks, and the large-stroke tensioning component includes a plurality of large-stroke copper blocks. The small-stroke copper blocks and the large-stroke copper blocks are arranged alternately, and a high-pressure oil pipe is connected between adjacent small-stroke copper blocks and large-stroke copper blocks.

[0009] In this invention, preferably, the short-stroke lifting assembly includes a plurality of short-stroke ejector blocks, and the long-stroke lifting assembly includes a plurality of long-stroke ejector blocks. The short-stroke ejector blocks and long-stroke ejector blocks are alternately arranged, and the radial height of the long-stroke ejector blocks is less than the radial height of the short-stroke ejector blocks.

[0010] In this invention, preferably, the support rod assembly includes a bushing seat, a guide copper sleeve, and a support shaft. The bushing seat is used to connect to the welding host, the guide copper sleeve is fixedly connected inside the bushing seat, and the bushing seat is used to guide the support shaft.

[0011] In this invention, preferably, the expansion rod assembly includes a plurality of elastic pressure members, a mounting portion is formed at one end of the expansion shaft away from the bushing seat, one end of the elastic pressure member is fixedly connected to the mounting portion, and the other end of the elastic pressure member is fixedly connected to the disc seat of the moving side lifting assembly.

[0012] In this invention, preferably, the elastic pressure member is provided with a guide rod, one end of the guide rod is fixedly connected to the disc seat of the moving side lifting assembly, and the other end of the guide rod is slidably engaged with the mounting part. The elastic pressure member includes a disc spring and a compression spring.

[0013] In this invention, preferably, the linkage assembly includes a first linkage and a second linkage, the first linkage and the second linkage have different lengths, and the linkage assembly corresponding to the small stroke tensioning assembly is arranged in opposite directions to the linkage assembly corresponding to the large stroke tensioning assembly.

[0014] In this invention, preferably, both the small-stroke copper block and the large-stroke copper block have guide grooves on their inner sides, and the guide grooves slide in cooperation with the guide rails on the disc seat; when the small-stroke copper block is in the contracted state, it is located inside the large-stroke copper block to form a staggered structure; when it is in the ejected state, the outer arc surfaces of the small-stroke copper block and the large-stroke copper block are flush and joined together to form a complete circumferential surface; and both the small-stroke copper block and the large-stroke copper block have weld grooves extending in the circumferential direction in their middle parts.

[0015] A method of using a seamless inner support fixture for circumferential welding of a skirted shell, comprising: The tooling is installed on the welding host and the shell to be welded is placed on it. At this time, it is in a retracted state. The hydraulic cylinder of the welding host is activated, driving the expansion shaft to move along the first direction, causing the moving side lifting assembly to move towards the fixed side lifting assembly; As the linkage assembly rotates closer, the large-stroke tensioning assembly and the small-stroke tensioning assembly are staggered and opened to the initial opening state; The short-stroke lifting component first radially expands the short-stroke tensioning component until it contacts the shell to be welded, and then the long-stroke lifting component radially expands the long-stroke tensioning component until it contacts the shell to be welded, and switches to the ejected state; The welding machine starts up and completes the welding process; After welding is completed, the hydraulic cylinder of the welding host is activated, pushing the expansion shaft to move in the opposite direction, so that the large stroke tensioning component and the small stroke tensioning component switch from the ejected state to the initial expansion state and then return to the contracted state.

[0016] The beneficial effects of this invention are: 1. This invention, through a staggered avoidance structure and a linkage transmission amplification design, allows the small-stroke tensioning copper block to be staggered inside the large-stroke tensioning copper block in the contracted state. The overall outer diameter of the tooling can be adapted to the end cap port size, allowing it to smoothly enter the inner cavity without disassembling the shell. After expansion, the linkage assembly converts the small axial stroke of the slide into a large radial stroke of the copper block, making the copper block fit together into a complete circumferential surface that fits seamlessly with the large-diameter inner wall. The support area is sufficient, avoiding the assembly errors and support failures caused by size inconsistencies in traditional external clamping tooling.

[0017] 2. This invention achieves initial positioning by first using a small-stroke tensioning component to fit the transition section, protecting the low-rigidity transition section from rigid impact. Then, a large-stroke tensioning component fits the inner wall to complete precise roundness correction, effectively controlling the roundness error of the inner wall and transition section to a very small range. At the same time, the chromium-zirconium-copper tensioning copper block directly supports the inner wall, preventing the weld pool from collapsing. This ensures that the height deviation of the inner wall weld meets high industry standards, completely eliminating the need for manual grinding in narrow cavities. This not only improves the consistency of weld quality but also avoids the quality fluctuations caused by manual adjustments in traditional tooling, significantly improving the weld pass rate.

[0018] 3. This invention significantly reduces the positioning time of the skirted housing. Compared to manual tooling adjustments, the positioning time per unit is greatly reduced, increasing daily production capacity several times over. Furthermore, by adjusting the preload of the elastic element with set screws and adapting to skirted housings with different port and inner wall diameter ratios, frequent tooling module changes are eliminated, meeting the needs of flexible production. In addition, the integrated temperature control system uses copper block oil circuit cooling to stably control the temperature of the inner wall and transition section of the housing within a safe range, effectively preventing welding thermal deformation and further ensuring quality stability in mass production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partially enlarged structural schematic diagram of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention.

[0020] Figure label: 1. Short-stroke tensioning assembly; 10. Short-stroke copper block; 2. Long-stroke tensioning assembly; 20. Long-stroke copper block; 3. Retraction rod assembly; 31. Bushing seat; 32. Guide copper sleeve; 33. Retraction shaft; 331. Mounting part; 34. Compression spring; 35. Disc spring; 36. Guide rod; 4. Lifting seat assembly; 41. Fixed side lifting assembly; 42. Moving side lifting assembly; 43. Slide; 44. Elastic element; 45. Set screw; 46. Guide slide rail; 5. Linkage assembly; 51. First link; 52. Second link; 6. Short-stroke ejector block; 7. Long-stroke ejector block; 8. High-pressure oil pipe. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Please also see Figures 1 to 3 This embodiment provides a seamless internal support fixture for circumferential welding of skirted shells and its usage method. The seamless internal support fixture for circumferential welding of skirted shells of this invention, through the coordinated operation of multiple components, forms a complete working system of power drive, transmission amplification, step-by-step tightening, and temperature control, to adapt to the variable diameter structure of the skirted shell and ensure welding quality.

[0025] Among them, the small-stroke clamping component 1 and the large-stroke clamping component 2 are core components that directly contact the inner wall of the shell and the transition section. Both contain several clamping copper blocks. The small-stroke clamping component 1 includes several small-stroke copper blocks 10, and the large-stroke clamping component includes several large-stroke copper blocks 20. The small-stroke copper blocks 10 and the large-stroke copper blocks 20 are made of chromium-zirconium copper, which has good thermal conductivity and wear resistance. The copper blocks have weld grooves in the middle that correspond to the circumferential seam. The main purpose is to ensure that the shape and height of the inner weld meet the technical requirements. When the small-stroke clamping component 1 and the large-stroke clamping component 2 are clamped, the weld grooves on the small-stroke copper blocks 10 and the large-stroke copper blocks 20 are aligned. The small-stroke clamping component 1 and the large-stroke clamping component 2 are alternately distributed along the circumference. The copper blocks of the small-stroke clamping component 1 are mainly used to first contact the transition section of the shell to achieve initial positioning and protection of the transition section. The copper blocks of the large-stroke clamping component 2 then fit against the inner wall of the shell in subsequent actions to complete the final clamping and roundness correction.

[0026] The expansion rod assembly 3 provides power and stable guidance for the tooling. One end of its bushing seat 31 is fixed to the welding host, providing the mounting and positioning foundation for the entire tooling. A guide copper sleeve 32 is fixed inside the bushing seat 31, through which the expansion shaft 33 passes. One end is connected to the hydraulic cylinder of the welding host, enabling axial extension and retraction via the hydraulic cylinder. The end of the expansion shaft 33 furthest from the bushing seat 31 has a mounting part 331, on which a spring-loaded pressure component is connected. This spring-loaded pressure component includes a compression spring 34 and a disc spring 35. The other end is fixedly connected to the moving-side lifting assembly 42, which buffers impact during tightening, ensuring smooth operation and preventing damage to the housing. Furthermore, a guide rod 36 passes through a hole in the mounting part 331 of the expansion shaft 33, with one end fixed to the moving-side lifting assembly 42, restricting the circumferential rotation of the expansion shaft 33 and ensuring accurate power transmission.

[0027] The lifting seat assembly 4 is divided into a fixed-side lifting seat and a movable-side lifting seat, both based on a disc base structure. Several slides 43 are distributed circumferentially on the disc base, with the number and position of the slides 43 corresponding to the small-stroke tensioning assembly 1 and the large-stroke tensioning assembly 2, respectively. The slides 43 are mounted on the guide rails 46 of the disc base, allowing for smooth sliding along the rails. Each slide 43 is equipped with an elastic element 44 and a set screw 45. The elastic element 44 is used to reset the slide 43 when the tooling retracts, while the set screw 45 can adjust the preload between the elastic element 44 and the slide 43 to accommodate the tensioning requirements of shells with different thicknesses. The fixed-side lifting seat is fixedly connected to the bushing seat 31, while the movable-side lifting seat is connected to the expansion shaft 33 via the guide rod 36, allowing it to move closer to or further away from the fixed-side lifting seat under the influence of the expansion shaft 33.

[0028] The linkage assembly 5 is key to converting small-stroke input into large-stroke output. Each set of tensioning components corresponds to a set of linkage assemblies 5. Each set of linkage assemblies 5 includes two sets of linkages of different lengths and an intermediate rod segment. The intermediate rod segment is used to connect the copper block seat of the large-stroke copper block 20 or the small-stroke copper block 10. The linkages of different lengths allow the large-stroke copper block 20 or the small-stroke copper block 10 to expand or contract in staggered layers during movement. The two linkages are arranged crosswise and rotatably connected by a hinge shaft. One end is hinged to the slide 43 of the fixed-side lifting seat and the moving-side lifting seat, respectively, and the other end is hinged together to the copper block seat of the tensioning assembly. In this embodiment, there are two linkages on one side of the copper block seat, defined as the second linkage, and the linkage on the other side is defined as the first linkage. The hinge centers of these two second linkages form the four vertices of a parallelogram. When the movable side lifting seat approaches the fixed side lifting seat, the connecting rods on both sides of the copper block seat rotate around the hinge axis and approach each other, converting the axial movement of the slide 43 into the radial movement of the copper block seat. Furthermore, the stroke is amplified through the design of the connecting rod length, allowing the copper block to smoothly expand from a small size in the contracted state to a large size that fits against the inner wall of the housing.

[0029] In addition, the tooling is equipped with a lifting assembly and a temperature control system. The lifting assembly includes several short-stroke ejector blocks 6 and long-stroke ejector blocks 7, which are alternately installed in the keyway of the support shaft 33. The radial heights of the two are different, which can push the corresponding slide block 43 sequentially during the movement of the support shaft 33, realizing the step-by-step action of the short-stroke clamping assembly 1 and the long-stroke clamping assembly 2. The temperature control system consists of an oil circuit opened inside the copper block, a high-pressure oil pipe connecting adjacent copper blocks, and a mold temperature controller. The cooling medium provided by the mold temperature controller circulates in the oil circuit of the copper block through the high-pressure oil pipe, carrying away the heat absorbed by the copper block during the welding process, thereby controlling the temperature of the inner wall of the shell and the transition section and preventing thermal deformation.

[0030] The reason why this invention can adapt to the variable diameter structure of the skirted shell and ensure welding quality lies in the functional breakthrough achieved through three key principles. First, the stroke amplification principle of the linkage drive. The cross-hinged design of the linkage assembly 5 allows the linkage to convert the small axial stroke of the slide block 43 into a large radial stroke of the copper block when the moving side lifting seat and the fixed side lifting seat move relative to each other. This transmission method effectively solves the size contradiction that the tooling needs to pass through a small port when shrinking and support a large inner wall when expanding, so that the tooling achieves bidirectional compatibility in terms of size adaptability.

[0031] Secondly, there is the avoidance principle of the staggered structure. In the contracted state, the copper block of the small stroke tensioning component 1, through cooperation with the guide rail 46, is located inside the copper block of the large stroke tensioning component 2, forming a staggered avoidance structure. This significantly reduces the overall outer diameter of the tooling after contraction, ensuring that it can smoothly pass through the small-diameter port of the skirt shell. When the tooling is opened, the small stroke copper block 10 and the large stroke copper block 20 extend radially synchronously, and finally the outer arc surface is flush with the outer surface, splicing together to form a complete circumferential surface that fits perfectly with the inner wall of the shell. This ensures the seamlessness and stability of the support, avoiding dimensional interference during contraction and meeting the support requirements after opening.

[0032] Furthermore, the principle of phased tightening for roundness correction is employed. The ejector blocks at different heights in the lifting assembly allow the small-stroke tightening component 1 to first contact the transition section of the shell. This initial positioning of the transition section prevents damage to the less rigid section during subsequent actions, while simultaneously achieving initial roundness calibration of the shell. Subsequently, the large-stroke tightening component 2 adheres to the inner wall, and the rigid support of the copper block further corrects the roundness, ensuring that the roundness error of the inner wall of the shell is controlled within a reasonable range. The entire tightening process is smoothly carried out under the buffering effect of the elastic pressure component, avoiding damage to the shell from rigid impacts. Finally, the large-stroke tightening component 2 and the small-stroke tightening component 1 are tightened synchronously. This step relies on the shape settings of the small-stroke ejector block 6 and the large-stroke ejector block 7. Tightening wedges are set at the ends of the small-stroke ejector block 6 and the large-stroke ejector block 7, allowing the large-stroke tightening component 2 and the small-stroke tightening component 1 to tighten synchronously, resulting in uniform force on the inner wall of the shell.

[0033] The temperature control system is based on the principles of heat conduction and circulating cooling. The copper block made of chromium zirconium copper can transfer heat to the shell, preheat the shell before welding, and quickly absorb heat from the welding area. The circulating medium circulates in the oil circuit of the copper block to realize the transfer and exchange of heat, thereby stabilizing the temperature of the inner wall of the shell and the transition section within a safe range. This prevents defects such as sink marks and cracks in the transition section caused by excessive temperature, ensuring the consistency of welding quality.

[0034] Working principle: The tooling needs to be used in conjunction with the welding host machine. The first step is tooling pre-preparation. The assembled tooling is fixed to the rotating table of the welding host machine via the flange structure of the bushing seat 31. A dial indicator is used to calibrate the coaxiality of the tooling to ensure that the radial runout meets the requirements, preventing welding deviations caused by tooling eccentricity during subsequent welding. The mold temperature controller is then started, and the preheating temperature is set to preheat the supporting copper block. Once the copper block temperature stabilizes, the mold temperature controller is switched to welding pressure holding mode to ensure that the flow rate and temperature of the cooling medium meet the temperature control requirements during the welding process.

[0035] The next stage involves shell positioning and tooling entry. Using hoisting equipment, the skirt shell to be welded is lifted to a position directly above the tooling. The shell's orientation is adjusted so that the end cap faces downwards and aligns with the copper block in the retracted state of the tooling. The shell is slowly lowered, allowing the tooling to gradually enter the shell cavity along the end cap. The relative position of the copper block and the shell's circumferential seam is monitored in real-time using the welding host's visual positioning system. The shell position is adjusted to ensure that the axial and radial deviations between the weld groove in the center of the copper block and the shell's circumferential seam are within allowable limits. After the position is adjusted, the support bracket at the bottom of the shell is tightened to prevent swaying during subsequent tightening. Then, the hoisting slings are removed.

[0036] Next comes the step-by-step tightening and roundness correction stage. The welding host's hydraulic cylinder is activated, the tightening mode is set, and the hydraulic cylinder drives the expansion shaft 33 to retreat at a suitable speed, moving the movable side lifting seat closer to the fixed side lifting seat. As the movable side lifting seat moves, the connecting rod assembly 5 begins to rotate, and the copper block gradually transitions from a contracted state to a preliminary expanded state, gradually aligning the staggered structure. When the expansion shaft 33 continues to retreat to a certain position, the small-stroke ejector block 6 contacts the small-stroke slide block 43, pushing the small-stroke slide block 43 along the guide rail 46, thereby causing the small-stroke copper block 10 to extend radially until it contacts the transition section of the housing. At this point, an inner diameter dial indicator is used to measure the roundness of the housing to confirm the initial positioning effect. The expansion shaft 33 continues to retreat, and the large-stroke ejector block 7 contacts the large-stroke slide block 43, pushing the large-stroke copper block 20 to extend radially and fit against the inner wall of the housing. The roundness is measured again until the roundness error meets the requirements. At this point, the hydraulic cylinder pressure reaches the set value and locks, completing the entire tightening and roundness correction process.

[0037] Entering the circumferential welding stage, appropriate welding parameters are set according to the shell material and thickness, including welding current, voltage, welding speed, shell preheating temperature, and shielding gas flow rate. First, the temperature and flow rate of the circulating medium are adjusted. Each copper block is preheated to the shell preheating temperature. The rotary table of the welding host is started, driving the tooling and shell to rotate synchronously. Simultaneously, the welding robot is started, performing circumferential welding along the weld groove of the copper blocks according to the preset trajectory. During welding, the inlet and outlet temperatures of the mold temperature controller, the cylinder pressure, and the weld formation are monitored in real time. If the temperature exceeds the set range, the flow rate of the circulating medium in the mold temperature controller is adjusted promptly; if the pressure fluctuates, the cylinder thrust is fine-tuned to ensure a stable welding process and weld quality that meets requirements.

[0038] After welding, the process begins with tooling shrinkage and shell unloading. The mold temperature controller continues running for a period until the shell's inner wall temperature drops to a safe range, then it is turned off. The welding main unit's cylinder is activated, switched to shrinkage mode, and the expansion shaft 33 is driven to move in the opposite direction. The large-stroke ejector block 7 first disengages from the large-stroke slide block 43. The slide block 43 resets under the action of the elastic element 44, causing the connecting rod assembly 5 to fold. The large-stroke copper block 20 retracts radially and disengages from the shell's inner wall. The expansion shaft 33 continues to move forward, and the small-stroke ejector block 6 disengages from the small-stroke slide block 43. The small-stroke copper block 10 also retracts, and the tooling returns to its staggered shrinkage state, reducing the overall outer diameter to a size that can pass through the end cap port. Finally, the support bracket at the bottom of the shell is loosened, and the welded shell is lifted from the tooling using hoisting equipment. Compressed air is used to clean the surface of the tooling of welding slag and dust, preparing it for the next use.

[0039] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A tooling for seamless inner support welding of a skirted shell, characterized in that, include: Small stroke tensioning component (1); The large stroke tensioning assembly (2) includes a contracted state, a preliminary open state, and an extended state. A tension rod assembly (3) is provided, one end of which is mounted on the welding host and is used to provide a driving force for switching between the tensioned and retracted states. The lifting seat assembly (4) includes a fixed-side lifting assembly (41) and a movable-side lifting assembly (42). Several sets of linkage assemblies (5) are connected between the fixed-side lifting assembly (41) and the movable-side lifting assembly (42). Each linkage assembly (5) is used to connect the small-stroke tensioning assembly (1) or the large-stroke tensioning assembly (2). The short-stroke lifting assembly is used to push out the short-stroke tensioning assembly (1); A large-stroke lifting assembly is used to eject the large-stroke tensioning assembly (2). The ejection height of the small-stroke lifting assembly is less than that of the large-stroke lifting assembly. When the fixed-side lifting assembly (41) and the movable-side lifting assembly (42) are relatively close, the small-stroke tensioning assembly (1) and the large-stroke tensioning assembly (2) first switch from the retracted state to the initial open state. Then, the small-stroke lifting assembly first drives the small-stroke tensioning assembly (1) to tension the shell to be welded. Then, the large-stroke lifting assembly drives the large-stroke tensioning assembly (2) to tension the shell to be welded and switch to the ejected state. Finally, the small-stroke tensioning assembly (1) and the large-stroke tensioning assembly (2) are tensioned synchronously.

2. The seamless inner support fixture for circumferential welding of the skirted shell according to claim 1, characterized in that, The lifting seat assembly (4) includes a disc seat, on which a plurality of slides (43) are distributed circumferentially. The slides (43) are used to connect the connecting rod assembly (5). The slides (43) are slidably connected to the disc seat. The slides (43) are provided with an elastic element (44) and a set screw (45). The elastic element (44) is used to provide elastic force so that the slides (43) can be reset. The set screw (45) is used to adjust the preload between the elastic element (44) and the slides (43) to change the sliding stroke of the slides (43). The sliding stroke of the small stroke support assembly (1) corresponding to the slides (43) is smaller than the sliding stroke of the large stroke support assembly (2) corresponding to the slides (43).

3. The seamless inner support fixture for circumferential welding of the skirted shell according to claim 1, characterized in that, The small stroke tensioning component (1) includes several small stroke copper blocks (10), and the large stroke tensioning component (2) includes several large stroke copper blocks (20). The small stroke copper blocks (10) and large stroke copper blocks (20) are arranged alternately, and a high-pressure oil pipe (8) connects adjacent small stroke copper blocks (10) and large stroke copper blocks (20).

4. The seamless inner support fixture for circumferential welding of the skirted shell according to claim 1, characterized in that, The short-stroke lifting assembly includes several short-stroke ejection blocks (6), and the long-stroke lifting assembly includes several long-stroke ejection blocks (7). The short-stroke ejection blocks (6) and long-stroke ejection blocks (7) are alternately arranged, and the radial height of the long-stroke ejection block (7) is less than the radial height of the short-stroke ejection block (6).

5. The seamless inner support fixture for circumferential welding of the skirted shell according to claim 1, characterized in that, The support rod assembly (3) includes a bushing seat (31), a guide copper sleeve (32), and a support shaft (33). The bushing seat (31) is used to connect to the welding host. The guide copper sleeve (32) is fixedly connected inside the bushing seat (31). The bushing seat (31) is used to provide guidance for the support shaft (33).

6. The seamless inner support fixture for circumferential welding of the skirted shell according to claim 5, characterized in that, The expansion rod assembly (3) includes several elastic pressure members. The expansion shaft (33) has a mounting part (331) at one end away from the bushing seat (31). One end of the elastic pressure member is fixedly connected to the mounting part (331), and the other end of the elastic pressure member is fixedly connected to the disc seat of the moving side lifting assembly (42).

7. The seamless inner support fixture for circumferential welding of the skirted shell according to claim 6, characterized in that, The elastic pressure component is provided with a guide rod (36). One end of the guide rod (36) is fixedly connected to the disc seat of the moving side lifting assembly (42), and the other end of the guide rod (36) is slidably engaged with the mounting part (331). The elastic pressure component includes a disc spring (35) and a compression spring (34).

8. The seamless inner support fixture for circumferential welding of the skirted shell according to claim 1, characterized in that, The linkage assembly (5) includes a first linkage (51) and a second linkage (52). The first linkage (51) and the second linkage (52) have different lengths. The linkage assembly (5) corresponding to the small stroke tensioning assembly (1) is arranged in the opposite direction to the linkage assembly (5) corresponding to the large stroke tensioning assembly (2).

9. The seamless inner support fixture for circumferential welding of the skirted shell according to claim 3, characterized in that, The inner sides of both the small-stroke copper block (10) and the large-stroke copper block (20) are provided with guide grooves, which are slidably engaged with the guide rail (46) on the disc seat. When the small-stroke copper block (10) is in the contracted state, it is located inside the large-stroke copper block (20) to form a staggered structure. When it is in the ejected state, the outer arc surfaces of the small-stroke copper block (10) and the large-stroke copper block (20) are flush and joined together to form a complete circumferential surface. The middle of both the small-stroke copper block (10) and the large-stroke copper block (20) is provided with weld grooves extending in the circumferential direction.

10. A method of using a seamless inner support fixture for circumferential welding of a skirted shell, comprising the seamless inner support fixture for circumferential welding of a skirted shell as described in any one of claims 1-9, characterized in that... include: The tooling is installed on the welding host and the shell to be welded is placed on it. At this time, it is in a retracted state. The hydraulic cylinder of the welding host is started, driving the expansion shaft (33) to move along the first direction, causing the moving side lifting assembly (42) to move towards the fixed side lifting assembly (41); The connecting rod assembly (5) rotates closer, and the large stroke tensioning assembly (2) and the small stroke tensioning assembly (1) are staggered and opened to the initial opening state; The small-stroke lifting component first radially expands the small-stroke tightening component (1) until it contacts the shell to be welded. Then the large-stroke lifting component radially expands the large-stroke tightening component (2) until it contacts the shell to be welded, and switches to the ejection state. Then the small-stroke tightening component (1) and the large-stroke tightening component (2) tighten synchronously. The welding machine starts up and completes the welding process; After welding is completed, the hydraulic cylinder of the welding host is started, pushing the expansion shaft (33) to move in the opposite direction, so that the large stroke tensioning component (2) and the small stroke tensioning component (1) switch from the ejection state to the initial expansion state and then return to the contraction state.

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