Lifting and rotating platform tool for correcting and welding pipe fittings and using method of lifting and rotating platform tool

Abstract

The invention belongs to the related technical field of ship production design matching tools, and discloses a lifting and rotating platform tool for correcting and welding pipe fittings, the lifting and rotating platform tool comprises a pipe fitting fixing platform and a pipe fitting chuck type bracket, the fixing platform is provided with a plurality of positioning holes which are uniformly distributed at intervals, and the positioning holes are used for fixing the chuck type bracket; the pipe chuck type bracket is jointly composed of a lower assembly and an upper assembly, and the lower assembly is inserted into the positioning hole and synchronously moves up and down through two turbine screw lifters which are connected in series through couplings; the lower assembly comprises a base, a chuck, a rack clamping jaw, a chuck adjusting mechanism and the like, and has the functions of lifting, rotating, radial moving, pitching adjusting and the like. The invention further discloses a corresponding use method. By means of the device, all operations of pipe calibration and pipe fitting welding can be completed by one person, the production efficiency is remarkably improved, any pipe fitting can be rotated to the needed angle and stably kept, and meanwhile the device has the advantages of being convenient to operate and control, high in flexibility, high in adaptability and the like.

Description

Technical Field

[0001] This invention belongs to the technical field of ship production design and supporting tooling, and more specifically, relates to a lifting and rotating platform tooling for calibrating and welding pipe fittings and its usage method. Background Technology

[0002] The production design of ship piping systems is the most labor-intensive, complex, and tedious part of shipbuilding, encompassing production design, fabrication, and on-site installation. After the production design is completed, the piping system parts drawings need to be laid out in the workshop for cutting and bending. Then, on a platform in the workshop, the pipes are aligned according to the dimensions, corners, and branch pipes on the parts drawings.

[0003] In existing technologies, the construction method typically involves placing various pipe components on a alignment platform and spot welding elbows, tees, branch pipes, flanges, etc., on the platform. This process requires multiple people to cooperate: one person performs spot welding, while one or two people manually hold the pipe components or accessories for assistance in alignment, which is time-consuming and labor-intensive. On the other hand, after the pipe components are aligned, the welding process begins. This also requires personnel to cooperate in the welding operation on a welding platform. While the welder is performing the welding operation, the personnel assisting in the welding operation rotate the direction of the pipe. Generally, at least one person is required to assist in rotating the pipe components.

[0004] Accordingly, there is an urgent need for research and improvement in this field in order to better meet the high-quality and high-efficiency requirements for the calibration and welding processes of various pipe fittings during the production and design of ship piping systems. Summary of the Invention

[0005] To address one or more of the above-mentioned deficiencies or improvement needs of existing technologies, this invention provides a lifting and rotating platform tooling and method for calibrating and welding pipe fittings. By closely integrating the working conditions and specific requirements of calibrating and welding processes in ship piping system production design, the overall structure and working mechanism of the supporting lifting and rotating platform are redesigned. At the same time, targeted improvements are made to some key components such as the chuck and chuck adjustment mechanism. Consequently, not only can a single person complete all operations of calibrating and welding pipe fittings, significantly improving production efficiency, but it can also rotate any pipe fitting to the required angle with high precision and maintain it stably. It also has the advantages of easy operation, high flexibility, and strong adaptability, and is therefore particularly suitable for applications such as ship piping system production design.

[0006] To achieve the above objectives, according to one aspect of the present invention, a lifting and rotating platform fixture for calibrating and welding pipe fittings is provided, characterized in that the fixture includes a pipe fitting fixing platform and a pipe fitting chuck-type bracket, wherein: The pipe fitting fixing platform is fixed to the ground by columns, and multiple evenly spaced positioning holes are provided on the upper surface of the platform. These positioning holes are arranged in a two-dimensional array along the X and Y axes for inserting and fixing the pipe fitting chuck bracket. The pipe fitting chuck bracket consists of a lower assembly and an upper assembly. The lower assembly includes two turbine screw jacks connected in series by a coupling. Each turbine screw jack is inserted into and mounted on the pipe fitting fixing platform via a support rod, and the support rod contains a threaded screw. When one turbine screw jack is driven, the coupling drives the other turbine screw jack to move synchronously, thereby realizing the synchronous up and down movement of the threaded screw. The upper component includes a base, a chuck, rack and pinion jaws, and a chuck adjustment mechanism. The lower end of the base is fixed to the top of the threaded screw, thereby moving up and down together with the threaded screw. The chuck is mounted on the base, and a chuck rotation gear is provided on the outer side of its annular frame. The chuck rotation drive gear, which meshes with the gear, drives the entire chuck to rotate. The inner side of the annular frame of the chuck is provided with a planetary gear set consisting of multiple jaw gears and a linkage gear, which rotates concentrically with the annular frame of the chuck. The rack and pinion jaws are multiple in number and are mounted radially on the annular frame of the chuck, used to clamp the pipe fittings inserted into the chuck. Furthermore, the chuck adjustment mechanism includes a jaw adjustment unit and a pitch adjustment unit. The jaw worm gear of the jaw adjustment unit is coaxially connected to the jaw gear, thereby driving the jaw gear to rotate synchronously, which in turn drives the rack and pinion jaws to perform synchronous radial movement. The pitch worm gear of the pitch adjustment unit is coaxially fixed to the rotating shafts at both ends of the chuck, thereby driving the chuck to rotate along its rotating shaft to achieve pitch adjustment.

[0007] As a further preferred embodiment of the present invention, for the pipe fixing platform, the circular positioning holes are distributed perpendicularly to each other in the X-axis direction and the Y-axis direction, and are parallel to the long and short sides of the upper surface of the platform.

[0008] As a further preferred embodiment of the present invention, each of the turbine screw jacks is equipped with a lifting handwheel, and the corresponding turbine screw jack is driven by rotating the lifting handwheel. At the same time, the coupling drives another turbine screw jack to move synchronously, thereby realizing the synchronous up and down movement of the threaded screw.

[0009] As a further preferred embodiment of the present invention, for the upper assembly of the pipe fitting chuck bracket, the number of its rack claws is three, four, six or other suitable number, which are evenly spaced along the circumference and each engages with the corresponding claw gear.

[0010] As a further preferred embodiment of the present invention, the chuck adjustment unit includes, in addition to the chuck worm gear, a chuck worm and a chuck handwheel. The chuck handwheel can be rotated to drive the chuck worm to drive the chuck worm gear to rotate, thereby driving the chuck gear to rotate synchronously, and thus driving the rack chuck to perform radial motion synchronously.

[0011] As a further preferred embodiment of the present invention, the pitch adjustment unit includes, in addition to the pitch worm gear, a pitch worm and a pitch handwheel. The pitch worm can be driven by rotating the pitch handwheel, thereby causing the pitch worm gear and the chuck to rotate together along the chuck shaft, thus achieving the purpose of pitch adjustment.

[0012] As a further preferred embodiment of the present invention, after the above-mentioned pipe fitting chuck bracket completes a series of operations such as lifting, rotating, radial movement and pitch adjustment, each component achieves self-locking to maintain its current position.

[0013] According to another aspect of the present invention, a corresponding method of use is also provided, characterized in that the method includes the following steps: S1. Install the pipe fitting chuck bracket on the pipe fitting fixing platform, and drive the turbine screw jack to adjust the chuck of the upper component to the required height; S2. Adjust all the jaws to the maximum spacing using the jaw adjustment unit, and adjust the pitch angle of the chuck using the pitch adjustment unit. S3. Lift the spot-welded pipe fittings, insert them into the chuck, and tighten the jaws to clamp them; then drive the chuck to rotate the pipe fittings together, and simultaneously weld the weld seams at the ends of the pipe fittings.

[0014] In summary, the technical solutions conceived by this invention have the following main technical advantages compared with the prior art: (1) This invention designs the overall structure and working mechanism of the lifting and rotating platform tooling in a targeted manner. This tooling can reduce the number of operators at each workstation to a single person to complete all operations of pipe alignment and welding, which significantly improves production efficiency. In addition, it can also effectively improve the efficiency of in-field pipe alignment, pipe movement and other links, reduce the number of multiple people working and the coordination of crane operators, and greatly reduce the waiting time for cranes and overhead cranes. Therefore, it shortens the entire processing flow of in-field pipe fittings and the construction cycle of products, making the in-field production of various pipe fittings more convenient and faster. (2) The lifting and rotating platform tooling of the present invention can provide a series of functions including lifting, rotating, radial movement and pitch adjustment. Moreover, during the entire operation, the axis deviation of the pipe is less when rotating, and the rotation process is more stable and smooth, thereby further improving the welding quality and welding efficiency. (3) The lifting and rotating platform tooling of the present invention has a compact overall structure and is easy to operate. It also has the advantages of high flexibility and strong adaptability. It can realize the welding of straight pipes and bends, as well as the processing of auxiliary parts such as elbows, tees, branch pipes, and flanges for welding straight and bend pipes. Therefore, it is especially suitable for applications such as ship piping system production and design. Attached Figure Description

[0015] Figure 1 This is a front view of the pipe fixing platform according to the present invention; Figure 2 This is a schematic diagram of the pipe fitting chuck bracket according to the present invention; Figure 3 The working process of the pipe fitting chuck bracket of the present invention is demonstrated in an exemplary manner; Figure 4 This is a structural schematic diagram of a straight pipe lifting bracket as an alternative according to the present invention; Figure 5 The working process of the above-mentioned straight pipe lifting bracket is demonstrated in the example. In this invention, the same reference numerals are used to denote the same elements or structures, wherein: 3-Pipe fitting; 4-Tee; 101-Column; 102-Positioning hole; 211-Wheeler screw jack; 213-Coupling; 214-Lifting handwheel; 215-Support rod; 2111-Threaded screw; 2210-Rack and pinion chuck; 2211-Planetary gear set; 2212-Linkage gear; 2213-Chuck chuck gear; 2214-Chuck rotation gear; 2215-Chuck rotation drive gear; 2216-Motor; 2231-Chuck worm gear; 2232-Chuck chuck handwheel; 2233-Chuck worm gear; 2234-Pitch worm gear; 2235-Pitch worm wheel; 2236-Pitch handwheel; 101-Bracket rail; 102-Roller bracket; 103-Limit bolt; 104-Ball bearing; 105-Drive motor; 106-Flange. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0017] It should be understood that expressions such as "comprising" and "may include" as used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "comprising" and / or "having" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but should not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0018] It should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] Figure 1 This is a front view of the pipe fixing platform according to the present invention. Figure 2 This is a structural schematic diagram of the pipe fitting chuck-type bracket according to the present invention. Reference will also be made below. Figure 1 and Figure 2 To explain the invention in more detail.

[0022] The lifting and rotating platform tooling of the present invention mainly includes a pipe fixing platform and a pipe chuck bracket, which will be explained in detail below.

[0023] See Figure 1 The pipe fixing platform is fixed to the ground by a column 101, and a plurality of evenly spaced positioning holes 102 are provided on the upper surface of the platform. These positioning holes 102 are distributed in a two-dimensional array along the X-axis and Y-axis directions for inserting and fixing the pipe clamp bracket.

[0024] More specifically, the upper surface of the pipe fitting fixing platform is used to fix pipe fittings and can be secured to the ground with bolts from the columns. The total height of the platform and columns is approximately 1m, allowing personnel to stand at the edge of the platform to operate the pipe fittings and equipment on its upper surface. The pipe fitting fixing platform comes in two models: a large platform (3m x 1.5m, 25mm thick) and a small platform (2m x 1.5m, 25mm thick). The upper surface of the platform is evenly distributed with Ф28mm circular holes at 100mm intervals. These circular holes form a two-dimensional horizontal right-angled array with two perpendicular axes, parallel to the long and short sides of the platform's top surface.

[0025] See Figure 2The pipe fitting chuck bracket consists of a lower assembly and an upper assembly. The lower assembly includes two turbine screw jacks 211 connected in series by a coupling 213. Each of them is inserted into and installed on the pipe fitting fixing platform via a support rod 215. The support rod 215 contains a threaded screw 2111. When one turbine screw jack 211 is driven, the coupling 213 drives the other turbine screw jack 211 to move synchronously, thereby realizing the synchronous up and down movement of the threaded screw.

[0026] More specifically, the support rod of the lifting platform is, for example, a Ф28mm round steel pipe inserted into the platform hole, with the support rod and platform hole fixed with a clearance fit. The support rod has a rack or trapezoidal threaded worm gear inside. Rotating the lifting handwheel drives one SWL worm gear screw lifting platform, and through a coupling drives another lifting platform to move synchronously, so that the screws of the two lifting platforms can move up and down synchronously.

[0027] The upper component includes a base, a chuck, rack and pinion jaws, and a chuck adjustment mechanism. The lower end of the base is fixed to the top of the threaded screw, thus moving up and down together with the threaded screw. The chuck is mounted on the base, and a chuck rotation gear 2214 is provided on the outer side of its annular frame. This gear, along with a chuck rotation drive gear 2215 meshing with the chuck, drives the entire chuck to rotate. The inner side of the annular frame of the chuck is provided with a planetary gear set 2211, consisting of multiple jaw gears 2213 and a linkage gear 2212, which rotates concentrically with the annular frame of the chuck. Multiple rack and pinion jaws 2210 are mounted radially on the annular frame of the chuck and are used to clamp pipe fittings inserted into the chuck. Furthermore, the chuck adjustment mechanism includes a jaw adjustment unit and a pitch adjustment unit. The jaw worm gear 2233 of the jaw adjustment unit is coaxially connected to the jaw gear 2213, thereby driving the jaw gear 2213 to rotate synchronously, which in turn drives the rack jaw 2210 to perform radial movement synchronously. The pitch worm gear 2235 of the pitch adjustment unit is coaxially fixed to the rotating shafts at both ends of the chuck, thereby driving the chuck to rotate along its rotating shaft to achieve pitch adjustment.

[0028] More specifically, the chuck is equipped with a planetary gear set 2211, which consists of, for example, 3, 4, or 6 jaw gears 2213 and a linkage gear 2212, which together drive the jaws to achieve radial synchronous movement. The linkage gear 2212 is embedded inside the annular frame of the chuck and can rotate concentrically with the annular frame. A chuck rotating gear 2214 is located outside the chuck. This chuck rotating gear 2214 is concentric with and fixed to the annular frame of the chuck, and meshes with a chuck rotation drive gear 2215. Power is provided by a motor and the chuck rotation drive gear 2215 to achieve the overall rotation of the chuck. The base is connected to the chuck via rotating shafts at both ends, and its lower end is fixed to the top of the screw 2111 of the worm gear screw jack 211 by bolts or other means. The chuck adjustment mechanism is further divided into two sets of devices: a jaw adjustment unit and a pitch adjustment unit. Each set consists of a worm gear, a worm, and a handwheel. In the jaw adjustment unit, the jaw worm gear 2233 and jaw gear 2213 are coaxially connected. Rotating the jaw handwheel 2232 drives the jaw worm 2231 to rotate the jaw worm gear 2233, which in turn drives the jaw gear 2213 to rotate synchronously, thereby causing the four jaws to move radially synchronously. In the pitch adjustment unit, the pitch worm gear 2235 is coaxially fixed to the rotating shafts at both ends of the chuck. Rotating the pitch handwheel 2236 drives the pitch worm 2234, causing the pitch worm gear 2235 and the chuck to rotate along their respective rotating shafts, thus achieving pitch adjustment.

[0029] In this way, the lifting, rotation, pitching, and jaw retraction movements of the pipe fitting chuck bracket are all driven by a worm gear mechanism. This mechanism uses a handwheel to rotate the worm, thereby adjusting the movement of each component of the chuck bracket. After each component of the bracket is adjusted to its correct position, due to the inherent characteristics of the worm gear mechanism, each component self-locks and maintains its adjusted position.

[0030] Figure 3 The operation of the pipe fitting chuck-type bracket of the present invention is illustrated exemplarily. See also Figure 3 Its working process may specifically include the following steps: S1. Install the pipe fitting chuck bracket on the pipe fitting fixing platform, and drive the turbine screw jack 211 to adjust the chuck of the upper component to the required height; S2. Adjust all the jaws to the maximum spacing using the jaw adjustment unit, and adjust the pitch angle of the chuck using the pitch adjustment unit. S3. Lift the spot-welded pipe fittings, insert them into the chuck, and tighten the jaws to clamp them; then drive the chuck to rotate the pipe fittings together, and simultaneously weld the weld seams at the ends of the pipe fittings.

[0031] It should be noted that the present invention also provides an alternative solution to the above-mentioned pipe fitting chuck bracket, which is applicable to straight pipe fittings and can be used in conjunction with the above-mentioned chuck bracket.

[0032] Figure 4 This is a structural schematic diagram of a straight pipe lifting bracket as an alternative according to the present invention, as shown below. Figure 4 As shown, the lower half of the straight pipe lifting bracket consists of two support rods, each containing a rack and gear. The two support rods are fixed together with bolts, allowing them to move up and down as needed. The upper half consists of two rollers 104, connected to a support rail 101 by a roller bracket 102 and secured with limit bolts 103. Flanges 106 are located on both sides. Furthermore, other components such as a drive motor 105 can be selected according to specific requirements.

[0033] During use, the wheel spacing can be freely adjusted according to the size of the pipe fittings. Two spot-welded straight pipe sections are placed on the tooling pulleys for simultaneous rotation and welding. The pulleys can be driven by a motor to automatically rotate the pipe angle, or the pipe fittings can be selected manually. This bracket can also be used for welding elbows, tees, flanges, and other components to both ends of straight pipes.

[0034] Figure 5 The working process of the aforementioned straight pipe lifting bracket is demonstrated. For example... Figure 5 As shown, its working process may specifically include the following steps: First, insert and install the straight pipe fitting bracket at a suitable position on the platform. Adjust the SWL worm gear screw jack to raise the chuck to the same height to ensure that the pipe fitting does not interfere with the platform or the ground during rotation. Next, adjust the limit bolts so that the rollers on the same track are symmetrically distributed and the rollers on different tracks are coaxial, ensuring that the pipe can rotate smoothly when placed on the rollers; Next, the spot-welded pipe fittings are hoisted, inserted into the chuck, and the jaws are tightened to clamp the pipe fittings. Finally, the pipe fitting is rotated manually or driven by a motor to rotate the rollers, and the welder performs welding on the weld seam at the pipe fitting end.

[0035] In summary, the platform tooling according to the present invention can effectively improve the labor efficiency of rotating and moving pipe fittings in the inner field, reduce the need for multiple workers and crane operators, and reduce the number of personnel required at each workstation on the inner field pipe fitting platform. It also significantly reduces waiting time for cranes and other equipment. When welders are welding in the inner field, chuck-type rotating tooling can be used for bending pipes, and liftable rotating wheel tooling can be used for straight pipe fittings, reducing the need for auxiliary personnel to rotate the pipe fittings. Each workstation can be reduced to one welder operating simultaneously, rotating and welding at the same time. After using the tooling, the pipe fitting rotation process exhibits less axial deviation and vibration, resulting in a smoother and more stable rotation process, greatly improving welding quality and efficiency. It also shortens the processing flow and production cycle of inner field pipe fittings, making inner field operations for pipe fitting production more convenient and efficient.

[0036] Therefore, the platform tooling of the present invention has a compact overall structure, is easy to operate, and has the advantages of high flexibility and strong adaptability. It can realize the welding of straight pipes and bends, as well as the processing of auxiliary parts such as elbows, tees, branch pipes, and flanges for welding straight and bend pipes. Therefore, it is particularly suitable for applications such as ship piping system production and design, and has good practical value and application prospects.

[0037] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lifting and rotating platform fixture for straightening and welding pipe fittings, characterized in that, The tooling includes a pipe fitting fixing platform and a pipe fitting chuck-type bracket, wherein: The pipe fitting fixing platform is fixed to the ground by a column (101), and a plurality of evenly spaced positioning holes (102) are provided on the upper surface of the platform. These positioning holes (102) are arranged in a two-dimensional array along the X-axis and Y-axis directions for inserting and fixing the pipe fitting chuck bracket. The pipe fitting chuck bracket is composed of a lower assembly and an upper assembly. The lower assembly includes two turbine screw jacks (211) connected in series by a coupling (213). Each of them is inserted into and installed on the pipe fitting fixing platform via a support rod (215). The support rod (215) is provided with a threaded screw (2111). When one of the turbine screw jacks (211) is driven, the coupling (213) drives the other turbine screw jack (211) to move synchronously, thereby realizing the synchronous up and down movement of the threaded screw (2111). The upper component includes a base, a chuck, a rack and pinion jaws, and a chuck adjustment mechanism. The lower end of the base is fixed to the top of the threaded screw, thus moving up and down together with the threaded screw. The chuck is mounted on the base, and its annular frame has a chuck rotation gear (2214) on its outer side, which is driven by a chuck rotation drive gear (2215) meshing with it and a matching motor, thereby realizing the rotation of the entire chuck. The annular frame of the chuck has a planetary gear set (2211) composed of multiple jaw gears (2213) and a linkage gear (2212) on its inner side, which rotates concentrically with the annular frame of the chuck. The rack... There are multiple jaws (2210), which are respectively mounted on the annular frame of the chuck in the radial direction and are used to clamp the pipe fittings inserted into the chuck. In addition, the chuck adjustment mechanism includes a jaw adjustment unit and a pitch adjustment unit. The jaw worm gear (2233) of the jaw adjustment unit is coaxially connected with the jaw gear (2213), thereby driving the jaw gear (2213) to rotate synchronously, and thus driving the rack jaws (2210) to perform radial movement synchronously. The pitch worm gear (2235) of the pitch adjustment unit is coaxially fixed with the rotating shafts at the left and right ends of the chuck, thereby driving the chuck to rotate along its rotating shaft to achieve the purpose of pitch adjustment.

2. The lifting and rotating platform fixture as described in claim 1, characterized in that, For the pipe fixing platform, the circular positioning holes (102) are distributed perpendicularly to each other in the X-axis direction and the Y-axis direction, and are parallel to the long and short sides of the upper surface of the platform.

3. The lifting and rotating platform fixture as described in claim 1 or 2, characterized in that, Each of the turbine screw jacks (211) is equipped with a lifting handwheel (214), and the corresponding turbine screw jack (211) is driven by rotating the lifting handwheel (214). At the same time, the coupling (213) drives another turbine screw jack (211) to move synchronously, thereby realizing the synchronous up and down movement of the threaded screw.

4. The lifting and rotating platform fixture as described in any one of claims 1-3, characterized in that, For the upper assembly of the pipe fitting chuck bracket, the number of its rack and pinion claws (2210) is three, four, six or other appropriate number, which are evenly spaced along the circumference and each engages with the corresponding claw gear (2213).

5. The lifting and rotating platform fixture as described in any one of claims 1-4, characterized in that, In addition to the pawl worm wheel (2233), the pawl adjustment unit also includes a pawl worm (2231) and a pawl handwheel (2232). The pawl handwheel (2232) can be rotated to drive the pawl worm (2231) to drive the pawl worm wheel (2233) to rotate, thereby driving the pawl gear (2213) to rotate synchronously, and thus driving the rack pawl (2210) to perform radial movement synchronously.

6. The lifting and rotating platform fixture as described in claim 5, characterized in that, In addition to the pitch worm gear (2235), the pitch adjustment unit also includes a pitch worm (2234) and a pitch handwheel (2236). The pitch worm (2234) can be driven by rotating the pitch handwheel (2236), thereby causing the pitch worm gear (2235) to rotate along the chuck shaft together with the chuck, thus achieving the purpose of pitch adjustment.

7. The lifting and rotating platform fixture as described in any one of claims 1-6, characterized in that, After the aforementioned pipe fitting chuck bracket completes the required series of operations of lifting, rotating, radial movement and pitch adjustment, each component self-locks to maintain its current position.

8. A method for performing pipe alignment and pipe fitting welding using the lifting and rotating platform fixture as described in any one of claims 1-7, characterized in that, The method includes the following steps: S1. Install the pipe fitting chuck bracket on the pipe fitting fixing platform, and drive the turbine screw jack (211) to adjust the chuck of the upper component to the required height; S2. Adjust all the jaws to the maximum spacing using the jaw adjustment unit, and adjust the pitch angle of the chuck using the pitch adjustment unit. S3. Lift the spot-welded pipe fittings, insert them into the chuck, and tighten the jaws to clamp them; then drive the chuck to rotate the pipe fittings together, and simultaneously weld the weld seams at the ends of the pipe fittings.

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