A pipe assembly welding tool and a pipe welding method

Abstract

This application discloses a pipe assembly welding fixture and a pipe welding method, relating to the field of welding fixtures. The fixture includes a base, on which at least one pipe fitting positioning bracket assembly and at least one pipe clamping clamp assembly are mounted. The pipe fitting positioning bracket assembly is used to position the pipe fitting, and the pipe clamping clamp assembly is used to position the pipe. The pipe fitting positioning bracket assembly includes a bracket body and multiple pipe fitting positioning elements with identical or different structures disposed on the bracket body. The pipe fitting positioning elements are detachably connected to the bracket body. After detachment, the pipe fitting positioning elements can move along the axis of the mounting hole used for connection between the pipe fitting positioning element and the bracket body, or move vertically, or move horizontally. This eliminates the restricted degrees of freedom after welding, facilitating overall disassembly after the pipe fitting and pipe are welded.

Description

Technical Field

[0001] This application belongs to the technical field of welding fixtures, and specifically relates to a pipeline assembly welding fixture and a pipeline welding method. Background Technology

[0002] Currently, the piping assemblies used in some aerospace products typically consist of several pipe joints and spatially angled pipes. To avoid interfering with internal components, the spatial shape and structure of these pipes are complex, making assembly and clamping difficult. The pipe joints in these assemblies are positioned at spatial angles to connect with interfaces on the product, and their relative positions require strict precision. However, due to limitations in the pipe bending process, the accuracy consistency of the pipes is not high. The current method of welding the piping assemblies with simple tooling and then individually correcting them results in a significant deviation between the relative positions of multiple pipe joints after welding compared to their theoretical positions. This makes correction difficult, time-consuming, and severely impacts production efficiency. Furthermore, during mass production, frequent disassembly and reassembly of the product easily damages the tooling.

[0003] How to utilize low-cost tooling to ensure accurate spatial positioning of installation joints, achieve rapid assembly and welding of these interfaces and pipelines, and ensure smooth assembly of pipeline components with the product after welding has become an urgent problem to be solved. Summary of the Invention

[0004] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide a pipeline assembly welding fixture and pipeline welding method, which positions the pipe joints and pipelines and shapes them during the welding process. After welding, the restricted degrees of freedom can be removed, which facilitates the overall disassembly after the pipe joints and pipelines are welded.

[0005] The technical solution provided in this application is as follows:

[0006] In a first aspect, a pipe assembly welding fixture is provided, including a base, on which at least one pipe joint positioning bracket assembly and at least one pipe clamping clamp assembly are mounted. The pipe joint positioning bracket assembly is used to position the pipe joint, and the pipe clamping clamp assembly is used to position and shape the pipe.

[0007] The pipe fitting positioning bracket assembly includes a bracket body and multiple pipe fitting positioning elements with the same or different structures disposed on the bracket body. The pipe fitting positioning elements are detachably connected to the bracket body. After the pipe fitting positioning elements are detached from the bracket body, the pipe fitting positioning elements can move along the axial direction of the mounting hole used for connecting the pipe fitting positioning elements to the bracket body, or move in the vertical direction, or move in the horizontal direction.

[0008] The pipe fitting positioning element includes a positioning pin and a positioning element connected to the positioning pin. The support body has a mounting hole, and one end of the support body at the mounting hole is a positioning mounting surface. The positioning pin passes through the mounting hole, and the positioning element contacts the positioning mounting surface. The positioning element is detachably connected to the support body. The end of the positioning pin is provided with a positioning structure for positioning the pipe fitting. This pipe fitting positioning element can have one of the following two structures:

[0009] First, the pipe fitting positioning element includes a positioning pin and a nut. The bracket body has a first mounting hole. The bracket body has a first positioning surface and a second positioning surface at both ends of the first mounting hole. The positioning pin has threads on its outside. One end of the positioning pin is a head with an outer diameter larger than the diameter of the first mounting hole, and the other end is provided with a pipe fitting positioning pin. The positioning pin passes through the first mounting hole, and the nut is threaded to the outside of the positioning pin. The positioning pin is installed and positioned when the head and the nut are respectively pressed against the first positioning surface and the second positioning surface. The pipe fitting positioning pin is used to position the pipe fitting, and the pipe fitting is threaded to the end of the positioning pin.

[0010] Among them, the first positioning pin is a positioning pin, the head of the first positioning pin is a positioning component, the mounting hole is the first mounting hole, the surface of the first positioning surface and the second positioning surface that is in contact with the head is the positioning mounting surface, and the pipe joint positioning pin is the positioning structure at the end of the positioning pin; by threading a nut onto the first positioning pin and making the head and the nut in contact with the first positioning surface and the second positioning surface respectively, the positioning component and the bracket body can be detachably connected.

[0011] Second, the pipe joint positioning element includes a positioning plate, a second positioning pin, an outer nut, and fixing screws. The bracket body has a second mounting hole, and one end of the bracket body with the second mounting hole is a third positioning surface. The positioning plate contacts the third positioning surface. At least two fixing screws pass through the positioning plate and are threadedly connected to the bracket body, allowing the positioning plate to be detachably connected to the bracket body. The positioning plate is connected to the second positioning pin, which passes through the second mounting hole. The outer nut is sleeved on the outside of the end of the second positioning pin that passes through the second mounting hole. The end of the second positioning pin has a pipe joint positioning cone surface. The pipe joint positioning cone surface and the outer nut are used to position the pipe joint.

[0012] Among them, the second positioning pin is a positioning pin, the positioning plate is a positioning component, the mounting hole is the second mounting hole, the positioning mounting surface is the third positioning surface, and the outer nut and the positioning cone surface of the pipe joint are the positioning structures at the end of the positioning pin; by setting at least two fixing screws that both pass through the positioning plate and are threadedly connected to the bracket body, the positioning component and the bracket body can be detachably connected.

[0013] In the second structure of the above-mentioned pipe fitting positioning element, the second positioning pin is detachably connected to the positioning plate.

[0014] In the second structure of the above-mentioned pipe joint positioning element, the positioning plate is provided with a fixing hole and a pin mounting hole that are perpendicular and connected to each other. The end of the second positioning pin is inserted into the pin mounting hole. A fixing member is provided in the fixing hole, and the fixing member passes through the fixing hole and through the end of the second positioning pin.

[0015] The pipe fitting positioning element includes a positioning seat, a fourth spatial positioning surface on the upper surface of the support body, a first positioning element mounting groove on the fourth spatial positioning surface of the support body, a positioning platform at the bottom of the positioning seat, the positioning platform cooperating with the first positioning element mounting groove, and the positioning seat fixed to the support body by a first connecting screw. The top of the positioning seat has a positioning groove that mates with the square pipe fitting, and a pressure plate is detachably connected above the positioning groove of the positioning seat. The pressure plate is used to fix the square pipe fitting on the positioning seat.

[0016] The pipe joint positioning element includes a second positioning seat, a fifth spatial positioning surface is provided on the upper surface of the support body, the second positioning seat is provided with an elongated hole, a second connecting screw passes through the elongated hole and is threaded to the support body, and a second positioning groove for positioning the pipe joint is provided on one side of the second positioning seat.

[0017] The pipe clamp assembly includes an adjustable support and a pipe clamp. The adjustable support includes a support body, left-hand and right-hand nuts, a lower stud, and an upper stud. The support body has an elongated hole through which a screw passes and is threaded to the base, allowing the support body to be mounted on the base. The support body has a C-shaped structure, with a guide hole at a spatial angle to the bottom surface at the top. The lower stud is mounted on the support body, and the upper stud passes through the guide hole and slides vertically on the support body, with the upper stud positioned above the lower stud. The left-hand and right-hand nuts are fitted around the lower and upper studs and threaded to both, with the external threads on the lower and upper studs in opposite directions. The pipe clamp is connected to the top of the upper stud and is used for positioning and shaping the pipe.

[0018] The pipe joint positioning bracket assembly is provided with a pipe auxiliary support, and the structure of the pipe auxiliary support is the same as that of the pipe clamping clamp assembly.

[0019] Secondly, a method for assembling and welding spatial pipelines is provided, comprising welding using any of the pipeline assembly and welding fixtures described above, including:

[0020] S1: Install and position the pipe fittings of the piping assembly before welding onto the respective pipe fitting positioning elements;

[0021] S2: Loosen the connection between the pipe fitting positioning element and the support body, adjust the pipe fitting positioning element along the axial degree of freedom of the mounting hole until the pipeline is connected to each pipe fitting, and then fix the pipe fitting positioning element to the support body.

[0022] S3: Adjust the pipe clamping assembly to clamp and fix the pipe;

[0023] S4: Weld the pipe fitting and the pipe together.

[0024] S5: Disconnect the pipe fitting positioning element from the support body, adjust the pipe fitting positioning element along the axial degree of freedom to separate the pipe fitting positioning element from the pipe fitting, loosen the pipe clamp, and remove the entire pipe assembly.

[0025] The pipeline assembly and welding fixture of this application rationally sets the positioning conversion benchmarks between the positioning structures of each pipe joint, ensuring both the manufacturability of the fixture and the accurate spatial position of the pipe joints. The fixture is easy to set up and has unrestricted degrees of freedom, ensuring the ease of installation and repair of pipe joints and pipelines, and facilitating the overall disassembly of the pipeline assembly after welding. The design incorporates flexible auxiliary supports to adapt to the dimensional accuracy of the pipelines, achieving shape maintenance during welding and avoiding the need for individual shape adjustments during assembly after welding, thus improving production efficiency. To accommodate tooling damage caused by mass production, vulnerable parts of the fixture need to be easily replaceable.

[0026] In summary, this application includes at least the following beneficial technical effects:

[0027] This invention provides a pipe assembly and welding fixture that comprehensively considers the spatial orientation of pipe components to determine their placement. It standardizes the positioning and installation benchmarks of various pipe fitting positioning supports and pipe clamping clamps, ensuring convenient assembly and good manufacturability. The pipe fitting positioning elements have axial degrees of freedom, and the adjustable pipe support components have multiple degrees of freedom, enabling rapid assembly and post-weld disassembly of various pipe component parts. This solves the clamping problem caused by low pipe bending accuracy and provides clamping support for the pipe section, achieving weld shaping. The modular design allows for easy replacement of damaged parts or changes in the fixture's structure due to variations in pipe component structure, resulting in low manufacturing costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the pipeline assembly and welding fixture in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the structure of a pipe joint positioning bracket assembly in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the pipe fitting fixing element 1 in the embodiments of this application;

[0031] Figure 4 This is a schematic diagram of the structure of the pipe fitting fixing element two in the embodiments of this application;

[0032] Figure 5This is a schematic diagram of the structure of the pipe fitting fixing element three in the embodiments of this application;

[0033] Figure 6 This is a schematic diagram of the structure of the pipe fitting fixing element four in the embodiments of this application;

[0034] Figure 7 This is a schematic diagram of the structure of a certain support body in an embodiment of this application;

[0035] Figure 8 This is a schematic diagram of the pipe clamp assembly in the embodiments of this application;

[0036] Figure 9 This is a top view of the pipe clamp assembly in the embodiments of this application;

[0037] Figure 10 This is a schematic diagram of the auxiliary support structure for the pipeline in the embodiments of this application.

[0038] Explanation of reference numerals: 1. Base; 2. Pipe connector positioning bracket assembly; 3. Bracket body; 4. Spatial positioning surface;

[0039] 4. Pipe fitting positioning element one; 4-1. Positioning pin one; 4-1-1. Pipe fitting positioning pin; 4-1-2. Thread; 4-2. Nut;

[0040] 5. Pipe fitting positioning element two; 5-1. Positioning plate; 5-2. Positioning pin two; 5-2-1. Pipe fitting positioning cone surface; 5-3. Outer nut; 5-4. Screw;

[0041] 6. Pipe fitting positioning element three; 6-1. Positioning seat one; 6-1-1. Positioning platform; 6-1-2. Positioning groove one;

[0042] 7. Pipe fitting positioning element four; 7-1. Positioning seat two; 7-1-1. Positioning groove two;

[0043] 8. Pipeline auxiliary support, 8-1 auxiliary support studs;

[0044] 9. Pipe clamps; 9-1. V-shaped lower clamp; 9-2. Flat plate upper clamp; 9-3. Slip bolt; 9-4. Wing nut;

[0045] 11. Pipe clamp assembly; 12. Adjustable support; 12-1. Support body; 12-1-1. Oblong hole; 12-1-2. Guide hole; 12-2. Left and right turn nuts; 12-3. Lower stud; 12-4. Upper stud; Detailed Implementation

[0046] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0047] This application discloses a pipeline assembly welding fixture, such as... Figure 1 As shown, it includes a base 1, on which are mounted a plurality of pipe joint positioning bracket assemblies 2 and a plurality of pipe clamping clamp assemblies 11. The pipe joint positioning bracket assemblies 2 are used to position the pipe joints, and the pipe clamping clamp assemblies 11 are used to position the pipes.

[0048] like Figure 3 and Figure 7 As shown, the base 1 is usually a flat plate, and the upper surface of the base is provided with the installation references for all pipe joint positioning bracket assemblies 2 and pipe clamping clamp assemblies 11. The relative positions of each installation reference are determined according to the spatial arrangement and position of the pipe.

[0049] Each pipe fitting positioning bracket assembly 2 can be regarded as an assembly module. Each pipe fitting positioning bracket assembly typically includes a bracket body and multiple pipe fitting positioning elements with the same or different structures set on the bracket body. The pipe fitting positioning elements are used to position pipe fittings with different structures.

[0050] For example, the pipe fitting positioning element can be any of the following: pipe fitting fixing element one, pipe fitting fixing element two, pipe fitting fixing element three, or pipe fitting fixing element four. The pipe fitting positioning bracket assembly can accurately position several pipe fittings that are close to each other, and can realize the assembly operation of pipe fittings and pipelines, as well as the post-weld disassembly of pipeline assemblies.

[0051] The bracket body is fixed on the base 1. The upper surface of the bracket body is provided with several spatial positioning surfaces 4. The height and inclination of each spatial positioning surface 4 are determined according to the actual space position required by the pipe joint or pipeline. The bracket body can be provided with positioning element mounting holes or positioning element mounting slots on the spatial positioning surfaces 4. The positioning element mounting holes or positioning element mounting slots are used to install pipe joint positioning elements and / or pipeline auxiliary supports 8, so as to cooperate with the pipe joint positioning elements and / or pipeline auxiliary supports 8 to perform spatial orientation.

[0052] like Figure 2 and Figure 3As shown, the pipe fitting fixing element includes a locating pin 4-1 and a nut. The bracket body has a first mounting hole, and a first positioning surface and a second positioning surface are respectively provided at both ends of the first mounting hole. The locating pin 4-1 has threads 4-1-2 on its exterior. One end of the locating pin 4-1 is a head, and the other end is provided with a pipe fitting locating pin 4-1-1. The locating pin 4-1 passes through the first mounting hole, and then the nut threaded 4-1-2 is connected to the exterior of the locating pin 4-1 until the head and the nut abut against the first and second positioning surfaces respectively, thus achieving the installation and positioning of the locating pin 4-1. The pipe fitting locating pin 4-1-1 and thread 4-1-2 are used for the installation and positioning of a pipe fitting. Specifically, the pipe fitting is sleeved over the locating pin 4-1, allowing the locating pin 4-1-1 to be inserted into the pipe fitting. The pipe fitting is then connected to the locating pin 4-1 with thread 4-1-2, achieving the installation and positioning of the pipe fitting. Welding can then be performed between the pipe fitting and the positioned pipe. After welding, the nut is loosened. At this point, the locating pin 4-1 can move and rotate along the axis of the first mounting hole. Rotating and moving the locating pin 4-1 continues until it disengages from the pipe fitting, achieving post-weld removal of the pipe fitting from the pipe fitting fixing element. Through the structural design of the pipe fitting fixing element, its positioning of the pipe fitting is achieved. Furthermore, by loosening the nut after welding, the locating pin 4-1 has a degree of freedom in the axial direction of the first mounting hole, allowing control over its movement in that direction to achieve pipe fitting removal.

[0053] like Figure 2 and Figure 4As shown, the second pipe fitting fixing element includes a positioning plate 5-1, a second positioning pin 5-2, an outer nut 5-3, and fixing screws 5-4. The bracket body has a second mounting hole, and one end of the bracket body with the second mounting hole is a third positioning surface. The positioning plate 5-1 contacts the third positioning surface. At least two fixing screws 5-4 pass through the positioning plate 5-1 and are threaded into the bracket body 4-1-2, enabling the positioning plate 5-1 to be detachably connected to the bracket body. The positioning plate 5-1 is connected to the second positioning pin 5-2, which passes through the second mounting hole. The outer nut 5-3 is fitted onto the outer side of the end of the second positioning pin 5-2 that passes through the second mounting hole. The outer nut 5-3 can move arbitrarily along the axis of the second positioning pin 5-2 and rotate freely around the outside of the second positioning pin 5-2. The diameter of the outer nut 5-3 is increased to prevent slippage. The end of the second positioning pin 5-2 that passes through the second mounting hole is provided with a pipe fitting positioning cone surface 5-2-1, and the end of the outer nut 5-3 is a stepped hole. First, align the pipe fitting with the positioning cone surface 5-2-1. Then, connect the pipe fitting to the threaded part 4-1-2 at the larger diameter position of the stepped hole at the end of the outer nut 5-3 and tighten it to position the pipe fitting. Welding can then be performed between the pipe fitting and the positioned pipe. After welding, loosen the fixing screw 5-4. The positioning plate 5-1 and the second positioning pin 5-2 will have the freedom to move along the axis of the second mounting hole. At this point, rotate the outer nut 5-3 until the pipe fitting disengages from it. Then, move the positioning plate 5-1, which will move the second positioning pin 5-2 and the outer nut 5-3 together until they disengage from the pipe fitting, thus removing the pipe fitting after welding.

[0054] The second positioning pin 5-2 is detachably connected to the positioning plate 5-1. The positioning plate 5-1 has a fixing hole and a pin mounting hole that are perpendicular and connected. The end of the second positioning pin 5-2 is inserted into the pin mounting hole. The fastener is inserted into the fixing hole and passes through the end of the second positioning pin 5-2, thereby fixing the second positioning pin 5-2 to the positioning plate 5-1. The fastener can be a bolt or a pin. The new second positioning pin 5-2 can be replaced by removing the fastener from the fixing hole.

[0055] like Figure 1 and Figure 5As shown, the pipe fitting fixing element three includes a positioning seat 6-1. A spatial positioning surface 4 on the upper surface of the support body is a fourth spatial positioning surface 4. The support body has a first positioning element mounting groove at the fourth spatial positioning surface 4. A positioning platform 6-1-1 is provided at the bottom of the positioning seat 6-1. The positioning platform 6-1-1 cooperates with the first positioning element mounting groove, and the positioning seat 6-1 is fixed to the support body by a first connecting screw 5-4, realizing a detachable connection between the positioning seat 6-1 and the support body. A positioning groove 6-1-2 for positioning the pipe fitting is provided at the top of the positioning seat 6-1. The positioning groove 6-1-2 is usually open upward. The square pipe fitting is placed in the positioning groove 6-1-2, and the pressure plate is pressed above the pipe fitting. Then, the pressure plate is connected to the positioning seat 6-1 to fix the square pipe fitting. After the pipe fitting and the pipeline are welded, the pressure plate is removed, and the square pipe fitting is moved upward to detach from the pipe fitting fixing element three, which facilitates quick disassembly after pipeline welding.

[0056] like Figure 2 and Figure 6 As shown, the pipe fitting fixing element four includes a positioning seat two 7-1. A spatial positioning surface 4 on the upper surface of the support body is the fifth spatial positioning surface 4. The positioning seat two 7-1 is provided with an elongated hole 12-1-1. The second connecting screw 5-4 passes through the elongated hole 12-1-1 and is threaded 4-1-2 to the support body. A positioning groove two 7-1-1 for positioning the pipe fitting is provided on one side of the positioning seat two 7-1. The pipe fitting fixing element is used to position the tee pipe fitting. The two ends of the tee pipe fitting have been accurately positioned by other pipe fitting positioning elements. The third end of the tee pipe fitting is a square end. The square end is locked in the positioning groove two 7-1-1 to fix the square pipe fitting. After the pipe fitting is welded to the pipeline, the second connecting screw 5-4 is loosened, and the positioning seat two 7-1 is moved along the elongated hole 12-1-1 to achieve quick disassembly of the pipe fitting.

[0057] In addition, depending on the specific structural requirements of the pipeline, auxiliary pipeline supports can be set on the pipe joint positioning bracket assembly. The structure of the auxiliary pipeline support is the same as that of the pipe clamp assembly, the only difference being that the auxiliary pipeline support is fixed on the pipe joint positioning bracket assembly, while the pipe clamp assembly is fixed on the base.

[0058] like Figure 1 , Figure 8 and Figure 9 As shown, the pipe clamp assembly 11 can be regarded as an assembly module, including an adjustable support 12 and a pipe clamp 9. The pipe clamp 9 is connected to the top of the adjustable support 2. The height of the adjustable support 2 is adjustable. The pipe clamp 9 is used to fix the pipe.

[0059] The adjustable support 12 includes a support body 12-1, a left- or right-hand screw nut 12-2, a lower stud 12-3, and an upper stud 12-4. The support body 12-1 has an elongated hole 12-1-1. A screw 5-4 passes through the elongated hole 12-1-1 and is threaded 4-1-2 to the base 1, allowing the support body 12-1 to be mounted on the base 1. Loosening the screw 5-4 allows the support body 12-1 to move. The support body 12-1 has a C-shaped structure, and a guide hole 12-1-2 at a spatial angle to the bottom surface is provided at the top of the support body 12-1. The lower stud 12-3 is mounted on the support body 12-1, and the upper stud 12-4 passes through the guide hole 12-1-2 and is vertically slidably connected to the support body 12-1. The upper stud 12-4 is located above the lower stud 12-3. The left-hand and right-hand screw nuts 12-2 are fitted onto the outside of the lower stud 12-3 and the upper stud 12-4, and are threaded 4-1-2 onto both studs 12-3 and 12-4. The external threads 4-1-2 on the lower stud 12-3 and the upper stud 12-4 are in opposite directions. The adjustable support 12 is adjusted along the axis of the guide hole 12-1-2 by rotating the left-hand and right-hand screw nuts 12-2. The adjustable support 12 achieves flexible clamping through adjustment in two directions along the axis of the left-hand and right-hand screw nuts 12-2.

[0060] The pipe clamp 9 includes a V-shaped lower clamp 9-1, a flat upper clamp 9-2, a swivel bolt 9-3, and a wing nut 9-4. The V-shaped lower clamp 9-1 is fixedly connected to the top of the upper stud 12-4. The flat upper clamp 9-2 is rotatably connected to one end of the V-shaped lower clamp 9-1. The swivel bolt 9-3 is rotatably connected to the other end of the V-shaped lower clamp 9-1. One end of the flat upper clamp 9-2 has a groove in which the swivel bolt 9-3 can be engaged. The wing nut 9-4 is threaded 4-1-2 and connected to the swivel bolt 9-3. The pipe is placed in the V-groove of the V-shaped lower clamp 9-1. The upper clamp 9-2 is rotated until the swivel bolt 9-3 is engaged in the groove, and the wing nut 9-4 is positioned on the side of the upper clamp 9-2 away from the V-shaped lower clamp 9-1. The wing nut 9-4 is then tightened, and the pipe is secured by the V-shaped lower clamp 9-1 and the upper clamp 9-2. This design of the V-shaped lower clamp 9-1 and the upper clamp 9-2 reduces the contact area between the clamps and irregularly shaped pipes.

[0061] like Figure 10 As shown, the pipeline auxiliary support includes a pipeline clamp and an auxiliary support stud 8-1 connected to the pipeline clamp.

[0062] The auxiliary support stud 8-1 is installed and positioned through a positioning element mounting hole on a spatial positioning surface on the upper surface of the support body. The auxiliary support stud includes a positioning cylindrical surface, with threads on both the upper and lower parts. The positioning cylindrical surface passes through the positioning element mounting hole, and nuts are fitted onto the threads on the upper and lower parts. The degree of freedom perpendicular to the spatial positioning surface is achieved by adjusting the two nuts. The pipeline auxiliary support is used to facilitate pipeline clamping and post-weld disassembly.

[0063] The present invention also provides a method for assembling and welding space pipelines, the specific steps of which are as follows:

[0064] 1. Install and position the pipe fittings of the piping assembly before welding onto the respective pipe fitting positioning elements.

[0065] 2. Loosen the nut on the pipe fitting positioning element and adjust the pipe fitting positioning element along the axial degree of freedom to facilitate the connection of the pipeline to each pipe fitting. Depending on the installation situation, the pipeline can be locally adjusted and calibrated.

[0066] 3. Adjust the adjustable support in the pipe clamp assembly to adjust the spatial position of the pipe clamp, thereby fixing the pipe in place.

[0067] 4. Perform welding operations to weld the pipe fittings and pipes together.

[0068] 5. Loosen the nut on the pipe fitting positioning element, adjust the pipe fitting positioning element along the axial degree of freedom, loosen the pipe clamp, and remove the entire pipe assembly.

[0069] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

[0070] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

Claims

1. A pipe fitting welding fixture, characterized by: Includes a base (1), on which at least one pipe fitting positioning bracket assembly and at least one pipe clamping clamp (9) assembly are mounted. The pipe fitting positioning bracket assembly is used to position the pipe fitting, and the pipe clamping clamp (9) assembly is used to position the pipe. The pipe fitting positioning bracket assembly includes a bracket body and multiple pipe fitting positioning elements with different structures disposed on the bracket body, including pipe fitting positioning element one and pipe fitting positioning element two; the pipe fitting positioning elements are detachably connected to the bracket body. After the pipe fitting positioning elements are detached from the bracket body, the pipe fitting positioning elements can move along the axial direction of the mounting hole used for connecting the pipe fitting positioning elements to the bracket body, or move in the vertical direction, or move in the horizontal direction. The pipe fitting positioning element includes a positioning pin (4-1) and a nut (4-2). The bracket body has a first mounting hole. The bracket body has a first positioning surface and a second positioning surface at both ends of the first mounting hole. The positioning pin (4-1) has a thread (4-1-2) on its outside. One end of the positioning pin (4-1) is a head with an outer diameter larger than the diameter of the first mounting hole, and the other end is provided with a pipe fitting positioning pin (4-1-1). The positioning pin (4-1) passes through the first mounting hole. The nut thread (4-1-2) is connected to the outside of the positioning pin (4-1). The positioning pin (4-1) is installed and positioned when the head and the nut are respectively pressed against the first positioning surface and the second positioning surface. The pipe fitting positioning pin (4-1-1) is used to position the pipe fitting, and the pipe fitting thread (4-1-2) is connected to the end of the positioning pin (4-1). The second positioning element for the pipe fitting includes a positioning plate (5-1), a second positioning pin (5-2), an outer nut (5-3), and a fixing screw (5-4). The bracket body has a second mounting hole, and one end of the bracket body with the second mounting hole is a third positioning surface. The positioning plate (5-1) contacts the third positioning surface. At least two fixing screws (5-4) pass through the positioning plate (5-1) and are threaded (4-1-2) into the bracket body. The positioning plate (5-1) is detachably connected to the bracket body. The positioning plate (5-1) is connected to the second positioning pin (5-2). The second positioning pin (5-2) passes through the second mounting hole, and the outer nut (5-3) is sleeved on the outside of the end of the second positioning pin (5-2) that passes through the second mounting hole. The end of the second positioning pin (5-2) is provided with a pipe fitting positioning cone surface (5-2-1). The pipe fitting positioning cone surface (5-2-1) and the outer nut (5-3) are used to position the pipe fitting.

2. The pipeline assembly welding fixture according to claim 1, characterized in that: The second positioning pin (5-2) is detachably connected to the positioning plate (5-1).

3. The pipeline assembly welding fixture according to claim 2, characterized in that: The positioning plate (5-1) has a fixing hole and a pin mounting hole that are perpendicular to each other and connected. The end of the positioning pin (5-2) is inserted into the pin mounting hole. A fixing member is provided in the fixing hole, and the fixing member passes through the fixing hole and through the end of the positioning pin (5-2).

4. The pipeline assembly welding fixture according to claim 1, characterized in that: It also includes a pipe fitting positioning element three, which includes a positioning seat one. A fourth spatial positioning surface (4) is provided on the upper surface of the support body. A first positioning element mounting groove is opened on the fourth spatial positioning surface (4) of the support body. A positioning platform (6-1-1) is provided at the bottom of the positioning seat one. The positioning platform (6-1-1) cooperates with the first positioning element mounting groove. The positioning seat one is fixed to the support body by a first connecting screw (5-4). A positioning groove one that cooperates with the square pipe fitting is opened on the top of the positioning seat one. A pressure plate is detachably connected above the positioning groove one of the positioning seat one. The pressure plate is used to fix the square pipe fitting on the positioning seat one.

5. The pipeline assembly welding fixture according to claim 1, characterized in that: It also includes a pipe fitting positioning element four, which includes a positioning seat two (7-1), a fifth spatial positioning surface (4) on the upper surface of the support body, a long oval hole (12-1-1) on the positioning seat two (7-1), a second connecting screw (5-4) passing through the long oval hole (12-1-1) and threaded (4-1-2) to the support body, and a positioning groove two (7-1-1) for positioning the pipe fitting is provided on one side of the positioning seat two (7-1).

6. The pipeline assembly welding fixture according to claim 1, characterized in that: The pipe clamp (9) assembly includes an adjustable support (2) and a pipe clamp (9); the adjustable support (2) includes a support body (12-1), a left-hand and right-hand screw nut (12-2), a lower stud (12-3), and an upper stud (12-4). The support body (12-1) has an elongated hole (12-1-1), and a screw (5-4) passes through the elongated hole (12-1-1) and is threaded (4-1-2) to the base (1), so that the support body (12-1) is secured with screws ( 5-4) Installed on the base (1); the support body (12-1) is a C-shaped structure, and the opening direction of the C-shaped structure is horizontal. The top of the support body (12-1) is provided with a guide hole (12-1-2) at a spatial angle to the bottom surface; the lower stud (12-3) is installed on the support body (12-1), and the upper stud (12-4) passes through the guide hole (12-1-2) and is vertically slidably connected to the support body (12-1). The upper stud (12-4) is located above the lower stud (12-3); Left and right turn nuts (12-2) are fitted onto the outside of the lower stud (12-3) and the upper stud (12-4) and are threaded (4-1-2) onto both the lower stud (12-3) and the upper stud (12-4). The external threads (4-1-2) on the lower stud (12-3) and the upper stud (12-4) are in opposite directions. Pipe clamps (9) are connected to the top of the upper stud (12-4) and are used to position the pipe.

7. A pipeline assembly welding fixture according to claim 6, characterized in that: The pipe joint positioning bracket assembly is provided with a pipe auxiliary support (8), and the structure of the pipe auxiliary support (8) is the same as that of the pipe clamp (9) assembly.

8. A method for assembling and welding space pipelines, characterized in that, Welding is performed using a pipe assembly welding fixture as described in any one of claims 1-7, including: S1: Install and position the pipe fittings of the piping assembly before welding onto the respective pipe fitting positioning elements; S2: Loosen the connection between the pipe fitting positioning element and the support body, adjust the pipe fitting positioning element along the axial degree of freedom of the mounting hole until the pipeline is connected to each pipe fitting, and then fix the pipe fitting positioning element to the support body. S3: Adjust the pipe clamp (9) assembly to clamp and fix the pipe; S4: Weld the pipe fitting and the pipe together; S5: Disconnect the pipe fitting positioning element from the support body, adjust the pipe fitting positioning element along the axial degree of freedom to separate the pipe fitting positioning element from the pipe fitting, loosen the pipe clamp (9), and remove the entire pipe assembly.

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