Combined pipe fitting tool

The combined pipe fitting fixture, which uses 3D-printed plastic or rubber positioning plates and welding platforms, solves the problems of existing fixtures being numerous, space-consuming, and complex to weld, and enables lightweight and low-cost pipe fitting processing and installation.

CN223617070UActive Publication Date: 2025-12-02ZHEJIANG YUEDING CORRUGATED TUBE
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Patent Information

Application Number
CN202423218729.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-12-02
Estimated Expiration
2034-12-25

AI Technical Summary

Technical Problem

The existing pipe fitting fixtures are assembled by welding several steel plates, which are numerous, take up a lot of space, have complex welding processes, increase production costs, and affect work efficiency.

Method used

The positioning plate, made of plastic or rubber, is 3D printed and detachably installed by engaging with the connection holes of the welding platform through locking parts. Combined with positioning grooves and positioning clips, it meets the installation requirements of different pipe fittings.

Benefits of technology

The tooling size and weight were reduced, simplifying handling and management, lowering manufacturing costs, improving work efficiency and processing accuracy, and meeting the installation requirements of complex connections.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a combined type pipe fitting tool which comprises a welding platform and a plurality of positioning plates arranged on the welding platform according to the extending path track of a preset pipeline, and a plurality of connecting holes are formed in the welding platform at equal intervals. The positioning plate is provided with a positioning groove structure used for being connected with different pipe fittings in a matched mode and a positioning clamping piece used for limiting the pipe fittings in the positioning groove structure, and the positioning plate is made of plastic materials or rubber materials and manufactured and formed through 3D printing and is detachably installed on the welding platform through cooperation of a locking piece and a connecting hole. According to the combined type pipe fitting tool, auxiliary measurement, welding and inspection can be conveniently conducted on pipe fitting assembly, the machining size precision of the pipe fitting is guaranteed, it is guaranteed that positioning is accurate when the pipe fitting is welded and assembled, the working efficiency is improved, the manufacturing cost can be effectively reduced, the tool storage site is saved, the product machining progress is accelerated, the technological process is saved, and the production efficiency is improved. The processing time is shortened; the operation of workers is convenient, and the like.
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Description

Technical Field

[0001] This utility model relates to the field of pipe fitting tooling technology, specifically to a combined pipe fitting tooling. Background Technology

[0002] Existing pipe fittings are selected and installed based on the installation location of the connected equipment, resulting in complex connection structures and multiple installation angles for some pipe fittings. This increases the difficulty of positioning and welding multiple pipe fittings. To address this, pipe fitting tooling can effectively ensure the dimensional accuracy of pipe fitting processing and ensure accurate positioning during workpiece welding and assembly. At the same time, when pipe fittings are complex and inconvenient to measure and inspect, tooling-assisted positioning can effectively assist in measurement and simulate the effect of on-site installation.

[0003] However, in practical applications, multiple pipe fittings are assembled to form one or more pipelines. Due to the wide variety of pipe fitting products, each product requires tooling and cannot be easily discarded. The number of toolings accumulates to a huge amount over time. Existing pipe fitting tooling is made of several tooling plates welded together. The pipe fittings need to be tied to the tooling plates. The tooling plates are numerous and take up a lot of space. The welding process is complex, the tooling plates are difficult to manage and access, and the tooling plates are heavy and inconvenient to move, which increases production costs and affects work efficiency. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the fact that the pipe fitting tooling in the prior art is assembled by welding several tooling steel plates, and the pipe fitting needs to be tied to the tooling steel plates. The tooling plates are numerous and occupy a lot of space. The welding process is complicated, which increases the production cost and affects the work efficiency.

[0005] To solve the above-mentioned technical problems, this utility model provides a combined pipe fitting tooling, comprising:

[0006] A welding platform with multiple connection holes spaced at equal intervals;

[0007] The positioning assembly includes multiple positioning plates arranged on the welding platform according to the extension path trajectory of a preset pipeline, positioning groove structures set on the multiple positioning plates for adapting to and connecting different pipe fittings, and positioning clips fixed on the positioning plates for limiting the pipe fittings in the positioning groove structures, so that multiple pipe fittings are assembled and connected on the multiple positioning plates to form a pipeline. The positioning plates are integrally molded from plastic or rubber materials, and the multiple positioning plates are detachably installed on the welding platform through locking parts and connecting holes.

[0008] As a preferred embodiment, the positioning plate is provided with a pair of positioning holes, the distance between which is equal to the distance between two adjacent connecting holes on the welding platform.

[0009] As a preferred embodiment, the bottom of the positioning plate is provided with a positioning protrusion that matches and is inserted into the connecting hole, and the positioning hole is provided through the positioning protrusion.

[0010] As a preferred embodiment, the locking element is a positioning pin that is fixedly inserted into the connecting hole and the positioning hole.

[0011] As a preferred embodiment, the locking element is a positioning bolt that is fixedly inserted into the connecting hole and the positioning hole.

[0012] As a preferred embodiment, the positioning clip is a positioning clip plate that is inserted into the positioning plate and located on the extension path of the positioning groove structure. The positioning plate is provided with a positioning groove that forms a snap-fit ​​with the positioning clip plate. When the positioning clip plate and the positioning groove are snap-fitted together, the pipe on the positioning plate is clamped. The lower end of the positioning clip plate is formed with an arc-shaped pressure groove structure.

[0013] As a preferred embodiment, the positioning clamp is a positioning clamp fixed to the positioning plate and located on the extension path of the positioning groove structure. The positioning clamp is arc-shaped and presses the pipe on the positioning plate when fixed.

[0014] As a preferred embodiment, the positioning groove structure includes a straight positioning groove, a bent positioning groove, and a lifting positioning groove disposed on multiple positioning plates. The straight positioning groove extends in a linear manner parallel to the welding platform, the bent positioning groove extends in a curved manner parallel to the welding platform at a certain angle, and the lifting positioning groove extends in a bent or inclined manner toward the side opposite to the welding platform.

[0015] As a preferred embodiment, the multiple positioning plates are divided into a head positioning plate, a tail positioning plate, a turning positioning plate, and a straight-through positioning plate. The straight-through positioning plate is provided with a straight-through positioning groove, and the turning positioning plate is provided with a turning positioning groove. At least one turning positioning plate and one straight-through positioning plate are respectively provided between the head positioning plate and the tail positioning plate. The head positioning plate and the tail positioning plate are respectively provided with a straight-through positioning groove, a turning positioning groove, or a lifting positioning groove.

[0016] As a preferred embodiment, the welding platform is assembled from several platform modules, and each platform module has at least one connection hole.

[0017] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0018] 1. In the modular pipe fitting fixture provided by this utility model, multiple positioning plates are 3D printed from plastic or rubber materials and are fixedly installed on the welding platform by locking parts and connecting holes. Compared with traditional steel plates, the 3D printed positioning plates are smaller and lighter, making them easier to handle and disassemble, greatly saving handling effort, reducing costs, and significantly shortening the processing cycle. These positioning plates can be arbitrarily combined and installed on the welding platform according to the pipeline path trajectory, and are designed with multiple positioning grooves to meet the extension direction of different pipe fittings. Multiple pipe fittings are assembled on multiple positioning plates to form a preset pipeline. The modular pipe fitting fixture using this technical solution facilitates auxiliary measurement, welding, and inspection of pipe fitting assembly, effectively ensuring the dimensional accuracy of pipe fitting processing and ensuring accurate positioning during pipe fitting welding and assembly, improving work efficiency, and meeting the installation requirements of complex connection positions and installation angles for on-site simulation.

[0019] 2. In the combined pipe fitting fixture provided by this utility model, the positioning plate is detachably installed on the welding platform by means of positioning pins or positioning bolts, and the welding platform is assembled from several platform modules. In this way, the welding platform of appropriate area can be selected according to the installation size of the pipeline. This combined pipe fitting fixture can effectively reduce manufacturing costs, save tooling storage space, improve product processing progress, save process flow, shorten processing time and facilitate worker operation, etc., and has many other advantages, with good economic benefits.

[0020] 3. In the modular pipe fitting fixture provided by this utility model, the modular pipe fitting fixture designed with this technical solution has advantages in terms of production, compared with heavy steel tooling materials. The positioning plate made of polylactic acid plastic 3D printing is more cost-effective. In terms of processing technology, 3D printing is simpler and cheaper. In terms of maintenance, the positioning plate made of plastic material has advantages in terms of no rust and other maintenance problems. In summary, the modular fixture has very good economic benefits and greatly reduces costs.

[0021] 4. In the combined pipe fitting fixture provided by this utility model, a positioning protrusion that matches and inserts into the connection hole is provided at the bottom of the positioning plate. The positioning protrusion and the connection hole play a role in pre-positioning the positioning plate on the welding platform. Then, the positioning plate is locked on the welding platform by the positioning pin, thereby realizing the installation and fixation of the positioning plate on the welding platform. This makes the installation and disassembly of the positioning plate more convenient and improves work efficiency. By combining and installing multiple positioning plates on the welding platform, the connection needs of multiple pipe fittings at different angles and positions can be met.

[0022] 5. In the combined pipe fitting fixture provided by this utility model, the pipe fitting is installed in the positioning groove of the positioning plate, and then the positioning plate is installed and inserted into the positioning groove to form a snap-fit ​​fit that clamps the pipe fitting. At this time, the positioning plate can press the pipe fitting tightly against the positioning plate to prevent the pipe fitting from moving or falling off the positioning plate, thereby ensuring the stability and reliability of the pipe fitting installation position. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the combined pipe fitting tooling of this utility model;

[0025] Figure 2 This is a schematic diagram of the planar structure of the combined pipe fitting tooling of this utility model;

[0026] Figure 3 This is a cross-sectional schematic diagram of the positioning plate of this utility model installed on a welding platform;

[0027] Figure 4 This is a cross-sectional schematic diagram of another method of mounting the positioning plate of this utility model on a welding platform;

[0028] Figure 5 This is a schematic diagram of the installation of the positioning plate of this utility model on the welding platform.

[0029] Explanation of reference numerals in the attached drawings: 1. Welding platform; 11. Platform module; 2. Positioning plate; 21. Head positioning plate; 22. Tail positioning plate; 23. Turning positioning plate; 24. Straight-through positioning plate; 3. Positioning groove structure; 31. Straight-through positioning groove; 32. Bending positioning groove; 33. Lifting positioning groove; 4. Positioning clip; 41. Positioning clip plate; 42. Positioning clamp; 5. Connecting hole; 6. Positioning hole; 7. Positioning protrusion; 8. Positioning slot; 9. Pipe fitting. Detailed Implementation

[0030] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 utility model 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 utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Example

[0033] This utility model provides, for example Figure 1-5 The illustrated modular pipe fitting fixture includes:

[0034] Welding platform 1, which has multiple connecting holes 5 spaced at equal intervals;

[0035] The positioning assembly includes multiple positioning plates 2 arranged on the welding platform 1 according to the extension path trajectory of a preset pipeline, positioning groove structures 3 set on the multiple positioning plates 2 for adapting to and connecting different pipe fittings 9, and positioning clips 4 fixed on the positioning plates 2 for limiting the pipe fittings 9 in the positioning groove structures 3, so that multiple pipe fittings 9 are assembled and connected on the multiple positioning plates 2 to form a pipeline. The positioning plates 2 are integrally manufactured from plastic or rubber material using 3D printing, which is convenient to manufacture and has a variety of styles. The multiple positioning plates 2 are detachably installed on the welding platform 1 by locking parts and connecting holes 5 respectively.

[0036] The above-described implementation method is the core technical solution of this embodiment. Multiple positioning plates 2 are 3D printed from plastic or rubber materials and are fixedly installed on the welding platform 1 by locking parts and connecting holes 5. Compared with traditional tooling steel plates, the 3D printed positioning plates 2 are smaller in size and lighter in weight, making them easier to handle and disassemble, greatly saving handling effort, reducing costs, and significantly shortening the processing cycle. These positioning plates 2 can be arbitrarily combined and installed on the welding platform 1 according to the pipeline path trajectory, and are designed with multiple positioning grooves to meet the extension direction of different pipe fittings 9. Thus, multiple pipe fittings 9 are installed on multiple positioning plates 2 to assemble a preset pipeline. The combined pipe fitting tooling of this technical solution facilitates auxiliary measurement, welding, and inspection of pipeline assembly, effectively ensuring the dimensional accuracy of pipe fittings 9 and ensuring accurate positioning during pipe fitting 9 welding and assembly, improving work efficiency, and meeting the installation requirements of pipe fittings 9 for complex connection positions and installation angles in on-site simulation.

[0037] As a preferred embodiment, refer to Figure 1-2The positioning plate 2 has a pair of positioning holes 6, the distance between which is equal to the distance between two adjacent connecting holes 5 on the welding platform 1. This allows the locking element to pass through the positioning holes 6 and connecting holes 5 to position and install the positioning plate 2 on the welding platform 1. The bottom of the positioning plate 2 has a matching positioning protrusion 7 that passes through the connecting hole 5, with the positioning hole 6 penetrating the positioning protrusion 7. This structural design, through the positioning engagement of the positioning protrusion 7 and the connecting hole 5, pre-positions the positioning plate 2 on the welding platform. Then, the locking element secures the positioning plate 2 to the welding platform 1, achieving installation and fixation. This facilitates the installation and disassembly of the positioning plate, improves work efficiency, and allows for arbitrary combinations of installations on the welding platform according to pipeline routes, thus meeting the connection requirements of multiple pipe fittings at different angles and positions.

[0038] In a further preferred embodiment, the locking element is a positioning pin that is fixedly inserted through the connecting hole 5 and the positioning hole 6. After passing through the welding platform and the positioning plate, the positioning pin can be held in place by a snap ring or a limiting pin, thereby achieving the positioning and installation of the positioning plate 2 on the welding platform. Alternatively, the locking element can also be a positioning bolt that is fixedly inserted through the connecting hole 5 and the positioning hole 6. After passing through the welding platform and the positioning plate, the positioning bolt is fixed with a nut, thereby achieving the positioning and installation of the positioning plate 2 on the welding platform. Those skilled in the art can select the specific configuration of the locking element based on the above description, and will not elaborate further here.

[0039] like Figure 2 As shown, the welding platform 1 is assembled from several platform modules 11. Each platform module 11 has at least one connection hole 5. The platform modules 11 can be strip-shaped, rectangular, or other shapes, as long as they can be assembled into a welding platform. This allows for the selection of a welding platform with an appropriate area based on the size of the assembled pipe fittings. This modular pipe fitting fixture effectively reduces manufacturing costs, saves storage space, improves product processing speed, streamlines processes, shortens processing time, and facilitates worker operation, offering numerous advantages and significant economic benefits. The welding platform 1 is cast from a casting material and undergoes overall annealing heat treatment to eliminate internal stress, ensuring the platform's durability and stability. This welding platform 1 can serve as the base plate for each individual fixture. The positioning plate 2 can be installed on the standard welding platform using positioning pins or bolts. After welding or inspection of the pipe fittings is completed, the positioning plate can be removed. This welding platform can be disassembled or stored separately, thus achieving detachable and modular management.

[0040] In this embodiment, the 3D printing material for the positioning plate is specifically polylactic acid (PLA) plastic, which has high strength after molding. From a production perspective, the modular pipe fitting tooling designed using this technical solution is more cost-effective than heavy steel tooling materials. From a processing perspective, the 3D printing process is simpler and less expensive. From a maintenance perspective, the positioning plate 2 made of plastic is free from rust and other maintenance issues, making it more advantageous. In summary, the modular tooling described above has excellent economic benefits and significantly reduces costs.

[0041] The following is combined with Figure 1-4 The specific setup method for the positioning card is explained in detail:

[0042] The positioning clip 4 is a positioning clip plate 41 that is inserted into the positioning plate 2 and located on the extension path of the positioning groove structure 3. The positioning plate 2 is correspondingly provided with a positioning groove 8 that forms a snap-fit ​​with the positioning clip plate 41. When the positioning clip plate 41 is snap-fitted with the positioning groove 8, it clamps the pipe 9 located on the positioning plate 2. The lower end of the positioning clip plate 41 is formed with an arc-shaped pressure groove structure. With this structure, the pipe is installed in the positioning groove of the positioning plate 2, and then the positioning clip plate 41 is installed and inserted into the positioning groove 8 to form a snap-fit ​​that clamps the pipe. At this time, the positioning clip plate 41 can press the pipe 9 tightly against the positioning plate 2 to prevent the pipe from moving or falling off the positioning plate, thereby ensuring the stability and reliability of the pipe installation position.

[0043] As an alternative to the aforementioned positioning card 4, please refer to the following for details. Figure 4 The positioning clamp 4 is a positioning clamp 42 fixed to the positioning plate 2 and located on the extension path of the positioning groove structure 3. The positioning clamp 42 is arc-shaped and presses the pipe 9 located on the positioning plate 2 when fixed. In this way, the pipe 9 can be firmly fastened to the positioning plate 2 by the positioning clamp 42. Those skilled in the art can choose the specific setting method of the positioning clamp based on the above description, and other equivalent embodiments will not be described in detail here.

[0044] In this embodiment, since common pipe fittings mainly include straight pipes, bends, and elbows, the positioning groove structure 3 includes a straight positioning groove 31, a bend positioning groove 32, and a lifting positioning groove 33 disposed on multiple positioning plates 2, for reference. Figure 5The straight positioning groove 31 extends linearly parallel to the welding platform 1, the bending positioning groove 32 extends at a certain angle parallel to the welding platform 1, and the lifting positioning groove 33 bends or extends obliquely toward the side opposite to the welding platform 1. By providing the lifting positioning groove 33 on the positioning plate 2, the vertical extension arrangement of the pipe fitting is satisfied. Further preferably, the multiple positioning plates 2 are divided into a head positioning plate 21, a tail positioning plate 22, a turning positioning plate 23, and a straight positioning plate 24. The straight positioning plate 24 is provided with the straight positioning groove 31, and the turning positioning plate 23 is provided with the bending positioning groove 32. The straight positioning plate 24 can satisfy the straight positioning installation of the pipe fitting, and the turning positioning plate 23 can satisfy the corner positioning installation of the pipe fitting. At least one positioning plate 24 is provided between the head positioning plate 21 and the tail positioning plate 22. The head positioning plate 21 and the tail positioning plate 22 are used to position and install the pipe fittings at both ends of the pipeline. There are various types of pipe fittings at both ends of the pipeline. The head positioning plate 21 can be equipped with a straight positioning groove 31, a bend positioning groove 32, or a lifting positioning groove 33 depending on the type of pipe fitting. Similarly, the tail positioning plate 22 can be equipped with a straight positioning groove 31, a bend positioning groove 32, or a lifting positioning groove 33 depending on the type of pipe fitting. In summary, the combination and installation of the head positioning plate 21, the tail positioning plate 22, the bend positioning plate 23, and the straight positioning plate 24 on the welding platform can meet the installation requirements of pipe fittings at different angles and connection positions. At the same time, it facilitates auxiliary measurement, welding, and inspection of pipe fitting assembly, thereby improving work efficiency. Obviously, this positioning plate can be customized using 3D printing according to the type of pipe fitting. For example, in addition to the common types mentioned above, there are also T-shaped, Y-shaped, and U-shaped pipe fittings. In this way, T-shaped, Y-shaped, and U-shaped positioning grooves can be customized on the positioning plate to meet the installation requirements of different pipe fittings.

[0045] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A modular pipe fitting fixture, characterized in that, include: A welding platform (1) is provided with multiple connecting holes (5) spaced at equal intervals; The positioning assembly includes multiple positioning plates (2) arranged on the welding platform (1) according to the extension path trajectory of the preset pipeline, a positioning groove structure (3) set on the multiple positioning plates (2) for adapting and connecting different pipe fittings (9), and a positioning clip (4) fixed on the positioning plate (2) for limiting the pipe fittings (9) in the positioning groove structure (3), so that multiple pipe fittings (9) are assembled and connected on the multiple positioning plates (2) to form a pipeline. The positioning plates (2) are integrally molded from plastic or rubber material. The multiple positioning plates (2) are detachably installed on the welding platform (1) by locking parts and connecting holes (5).

2. The combined pipe fitting fixture according to claim 1, characterized in that: The positioning plate (2) is provided with a pair of positioning holes (6), and the distance between the pair of positioning holes (6) is equal to the distance between two adjacent connecting holes (5) on the welding platform (1).

3. The combined pipe fitting fixture according to claim 2, characterized in that: The bottom of the positioning plate (2) is provided with a positioning protrusion (7) that is matched and inserted into the connecting hole (5), and the positioning hole (6) is provided through the positioning protrusion (7).

4. The combined pipe fitting fixture according to any one of claims 1-3, characterized in that: The locking element is a positioning pin that is fixedly inserted into the connecting hole (5) and the positioning hole (6).

5. The combined pipe fitting fixture according to any one of claims 1-3, characterized in that: The locking element is a positioning bolt that is fixedly inserted into the connecting hole (5) and the positioning hole (6).

6. The combined pipe fitting fixture according to claim 1, characterized in that: The positioning clip (4) is a positioning clip plate (41) inserted into the positioning plate (2) and located on the extension path of the positioning groove structure (3). The positioning plate (2) is provided with a positioning groove (8) that forms a snap-fit ​​with the positioning clip plate (41). When the positioning clip plate (41) and the positioning groove (8) are snap-fitted together, the pipe (9) located on the positioning plate (2) is clamped. The lower end of the positioning clip plate (41) is formed with an arc-shaped pressure groove structure.

7. The combined pipe fitting fixture according to claim 1, characterized in that: The positioning clamp (4) is a positioning clamp (42) fixed to the positioning plate (2) and located on the extension path of the positioning groove structure (3). The positioning clamp (42) is arc-shaped and presses the pipe (9) located on the positioning plate (2) when fixed.

8. The combined pipe fitting fixture according to any one of claims 1-3, characterized in that: The positioning groove structure (3) includes a straight positioning groove (31), a bent positioning groove (32) and a lifting positioning groove (33) disposed on multiple positioning plates (2). The straight positioning groove (31) extends in a linear manner parallel to the welding platform (1). The bent positioning groove (32) extends in a bent manner parallel to the welding platform (1) at a certain angle. The lifting positioning groove (33) extends in a bent or inclined manner toward the side opposite to the welding platform (1).

9. The combined pipe fitting fixture according to claim 8, characterized in that: Multiple positioning plates (2) are divided into a head positioning plate (21), a tail positioning plate (22), a turning positioning plate (23), and a straight positioning plate (24). The straight positioning plate (24) is provided with a straight positioning groove (31), and the turning positioning plate (23) is provided with a turning positioning groove (32). The turning positioning plate (23) and the straight positioning plate (24) are respectively provided between the head positioning plate (21) and the tail positioning plate (22). The head positioning plate (21) and the tail positioning plate (22) are respectively provided with a straight positioning groove (31), a turning positioning groove (32), or a lifting positioning groove (33).

10. The combined pipe fitting fixture according to claim 1, characterized in that: The welding platform (1) is assembled from several platform modules (11), and each platform module (11) is provided with at least one connection hole (5).