Butt welding tool

Abstract

The utility model discloses a butt welding tool which is used for welding a first welding pipe and a second welding pipe and comprises a positioning assembly, the positioning assembly comprises a positioning mandrel and a fixing mechanism used for fixing the positioning mandrel, the positioning mandrel is provided with a positioning section, and the positioning section is used for being inserted into the non-welding end of the first welding pipe and positioning the first welding pipe; the positioning section is provided with an annular groove, a first sealing piece is fixed in the annular groove, and the first sealing piece is used for forming sealing between the first welding pipe and the positioning section; the fixing assembly is used for fixing the second welding pipe and enabling the second welding pipe to be aligned with the first welding pipe; the positioning mandrel is provided with an air inflation hole used for introducing fluid for verifying the sealing performance into the first welding pipe and the second welding pipe which are subjected to butt welding. According to the invention, the two welding pipes can be accurately positioned and conveniently welded, and meanwhile, welding seam leakage detection can be directly carried out after welding.

Description

Technical Field

[0001] This utility model relates to the field of pipeline butt welding technology, and in particular to a butt welding tool. Background Technology

[0002] In the installation and maintenance of pump piping systems, butt welding of threaded joints at the pipe ends is a common operation, and the welding quality directly affects the system's sealing performance and operational stability. Currently, in most industry scenarios, this type of work still relies on traditional manual butt welding processes, lacking specialized tooling support.

[0003] The existing manual welding process typically involves workers manually aligning the main pipe with the beveled end of the threaded joint, initially fixing it by spot welding a few points; then visually judging the axial deviation and using tools such as hammers and wrenches to straighten it; after manually confirming that the concentricity is acceptable, the bevel is fully welded. This process, which relies on operational experience, has many prominent problems.

[0004] Existing manual butt welding processes suffer from poor positioning accuracy. During welding, manual alignment without tooling assistance makes it difficult to ensure the concentricity of the pipe and threaded joint, leading to axial misalignment after welding. This error becomes more pronounced with larger pipe diameters, affecting not only the pipe's appearance but also hindering subsequent assembly processes such as flange connections. Secondly, there is the issue of post-weld deformation. Under stress, welded pipes may bend and deform, affecting aesthetics and potentially further complicating assembly.

[0005] Furthermore, existing manual butt welding processes cannot address weld quality inspection and repair during the welding process. Current procedures require two separate sets of equipment and two completely independent steps for leak detection after welding. Specifically, leak detection necessitates installing the pipeline into the pump system, introducing media, and determining if a leak is present at the weld. If a leak is found, the pipeline must be disassembled, and the weld re-welded. This process is then repeated. Overall, this is not only time-consuming and labor-intensive but also causes system downtime losses and increases production costs.

[0006] Therefore, it is necessary to propose a butt welding fixture to solve the above problems. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a butt welding fixture that enables precise positioning and convenient welding of two pipes, thereby better meeting the requirements of modern pump pipeline systems for welding quality and operational efficiency. It also allows for direct weld leak detection after welding.

[0008] The specific technical solution of this utility model embodiment is as follows:

[0009] A butt welding fixture for welding a first welded pipe and a second welded pipe, the butt welding fixture comprising: a positioning assembly, the positioning assembly including a positioning mandrel and a fixing mechanism for fixing the positioning mandrel, the positioning mandrel having a positioning section for inserting into the non-welded end of the first welded pipe to position the first welded pipe, the positioning section having an annular groove, and a first sealing element fixed in the annular groove, the first sealing element for forming a seal between the first welded pipe and the positioning section; and a fixing assembly for fixing the second welded pipe and aligning the second welded pipe with the first welded pipe; the positioning mandrel having an air inlet for introducing fluid to the first welded pipe and the second welded pipe after butt welding to verify the sealing performance.

[0010] In a preferred embodiment, the butt welding fixture further includes: a plug, which is used to sealably pass through the non-welded end of the second welded pipe to position the second welded pipe; a second sealing member, which is disposed between the plug and the second welded pipe to seal the non-welded end of the second welded pipe; the fixing assembly includes a positioning member and a fastening mechanism, the positioning member being used to position the plug or the second welded pipe, and the fastening mechanism being used to limit the plug or the second welded pipe axially and circumferentially.

[0011] In a preferred embodiment, the inflation hole is a through hole provided along the axial direction.

[0012] In a preferred embodiment, the plug includes a small-diameter section and a large-diameter section, the diameter of the small-diameter section being smaller than the diameter of the large-diameter section, and a limiting step forming at the transition position between the small-diameter section and the large-diameter section, the limiting step being used to abut against the second welded pipe; a sealing groove is provided on the outer surface of the small-diameter section, the sealing groove being used to install the second sealing element; a limiting groove is provided on the outer surface of the large-diameter section, the limiting groove being used to cooperate with the fastening mechanism.

[0013] In a preferred embodiment, the fastening mechanism includes: a semi-enclosed pressure plate with its opening facing downward and a fastener detachably disposed on the semi-enclosed pressure plate, the semi-enclosed pressure plate having a fastening hole, the fastener being mounted on the semi-enclosed pressure plate through the fastening hole, and the lower end of the fastener abutting against the limiting groove.

[0014] In a preferred embodiment, the fixing mechanism includes a first vertical plate with a mounting hole, and the positioning mandrel is installed in the mounting hole; or, the butt welding fixture further includes a bearing, and the positioning mandrel is installed in the mounting hole through the bearing; or, the fixing mechanism includes a chuck, and the positioning mandrel is engaged in the chuck and can be rotated by the chuck.

[0015] In a preferred embodiment, the positioning element includes a second vertical plate, and the positioning surface of the second vertical plate includes a first positioning inclined surface and a second positioning inclined surface arranged symmetrically, with the distance between the first positioning inclined surface and the second positioning inclined surface gradually increasing from top to bottom.

[0016] In a preferred embodiment, the first vertical plate and the second vertical plate are spaced apart by a predetermined distance, and the butt welding fixture further includes: a first auxiliary support assembly, the first auxiliary support assembly including a third vertical plate, the third vertical plate being located between the first vertical plate and the second vertical plate, and the third vertical plate having a positioning surface for auxiliary support of the second welded pipe.

[0017] In a preferred embodiment, the butt welding fixture further includes a horizontal base, on which the first vertical plate, the second vertical plate, and the third vertical plate are all fixed.

[0018] In a preferred embodiment, the butt welding fixture further includes a second auxiliary support assembly, which includes a fourth vertical plate located between the first vertical plate and the third vertical plate. The fourth vertical plate has a positioning surface for auxiliary support of the first welded pipe.

[0019] The technical solution of this utility model has the following significant beneficial effects:

[0020] The butt welding fixture provided in this application includes a positioning component for limiting the first welded pipe and a fixing component for limiting the second welded pipe. The positioning component has a positioning mandrel with a positioning section, and the fixing component has a positioning element with a positioning surface. The first welded pipe is fitted onto the positioning section, thereby providing a precise radial reference for the first welded pipe and stabilizing its axis after installation. The second welded pipe or its plug is placed on a positioning surface with a predetermined height and shape. Before welding, this positioning surface provides both axial and radial references for the plug. The positioning section of the first welded pipe ensures that the second welded pipe can be precisely aligned with the first welded pipe at the welding position, eliminating the need for repeated manual calibration and significantly improving alignment accuracy. During welding, the first welded pipe is rotatably connected to the positioning section, allowing it to rotate relative to the fixing mechanism used to fix the positioning mandrel. This facilitates easy switching of the welding position, improving welding efficiency and weld quality stability, and avoiding weld misalignment problems caused by traditional fixed positioning. It is especially suitable for pipeline scenarios requiring full circumference welding, ensuring uniform weld joints and reducing defects such as incomplete penetration and misalignment.

[0021] Meanwhile, the non-welded end of the first welded pipe is sealed by the positioning section, and the non-welded end of the second welded pipe is sealed by the plug. The positioning mandrel is provided with an air inlet for introducing fluid to the first and second welded pipes after butt welding to verify the sealing performance. This allows for direct weld leak detection after welding, overcoming a series of problems caused by the current requirement to install pipelines in a pump system for weld leak detection, such as time-consuming, labor-intensive, downtime losses, and high production costs.

[0022] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0023] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0024] Figure 1This is a schematic diagram of the structure of the first butt welding fixture provided in the embodiments of this application;

[0025] Figure 2 This is a right view of the structure of the first butt welding fixture provided in the embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the structure of the second butt welding fixture provided in the embodiments of this application;

[0027] Figure 4 This is a structural schematic diagram of the third type of butt welding fixture provided in the embodiments of this application.

[0028] The reference numerals in the above figures are as follows:

[0029] 100. First welded pipe;

[0030] 200. Second welded pipe;

[0031] 110. Positioning mandrel;

[0032] 111. Limiting part;

[0033] 112. Through hole;

[0034] 113. Positioning segment;

[0035] 120. First vertical plate;

[0036] 121. Mounting holes;

[0037] 220. The second vertical plate;

[0038] 221. First positioning inclined plane;

[0039] 222. Second positioning inclined plane;

[0040] 230. The third vertical plate;

[0041] 240. Horizontal base;

[0042] 301. First sealing element;

[0043] 302. Second sealing element;

[0044] 310. Plug;

[0045] 311. Small-diameter section;

[0046] 312. Large diameter section;

[0047] 313. Limiting step;

[0048] 314. Sealing groove;

[0049] 315. Limiting groove;

[0050] 410. Semi-enclosed pressure plate;

[0051] 411. Fastening hole;

[0052] 420. Fasteners;

[0053] 500. Pneumatic quick-connect coupling;

[0054] 600. Bearings;

[0055] 700, chuck. Detailed Implementation

[0056] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are only for explaining the purpose of this utility model and should not be construed as limiting this utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0058] This utility model provides a butt welding fixture that enables precise positioning and convenient welding of at least two weldable pipes, thereby better meeting the requirements of modern pump pipeline systems for welding quality and operational efficiency. It also allows for direct weld leak detection after welding.

[0059] Please refer to the following for comprehensive information. Figures 1 to 4This application specification provides a butt welding fixture, which may include: a positioning assembly, the positioning assembly including a positioning mandrel 110 and a fixing mechanism for fixing the positioning mandrel 110, the positioning mandrel having a positioning section 113 for inserting into the non-welded end of the first welded tube 100 to position the first welded tube 100; the positioning section 113 having an annular groove, and a first sealing member 301 fixed in the annular groove, the first sealing member 301 for forming a seal between the first welded tube 100 and the positioning section 113; and a fixing assembly for fixing a second welded tube 200 and aligning the second welded tube 200 with the first welded tube 100.

[0060] The positioning mandrel 110 is provided with an air inlet for introducing fluid to the first welded tube 100 and the second welded tube 200 after butt welding to verify the sealing performance.

[0061] The positioning mandrel 110 can be in the form of a stepped shaft. It may include a fixing section for cooperating with a fixing mechanism and a positioning section 113 for mounting the first welded pipe 100. A stepped limiting portion 111 is formed between the fixing section and the positioning section 113. This limiting portion 111 abuts against the non-welded end of the first welded pipe 100, thereby axially limiting the first welded pipe 100. Specifically, the positioning section 113 can be a shaft segment with a circular cross-section, or it can be a shaft segment with a non-circular cross-section, such as a shaft segment with a triangular or triangular cross-section. In the embodiments of this application, the circular cross-section of the positioning section 113 is mainly used as an example for illustration. When the cross-section of the positioning segment 113 is circular, its diameter can be adapted to the aperture of the first welded pipe 100. For example, they can be the same or close to each other, ensuring that after the first welded pipe 100 is installed on the positioning segment 113, its axis can coincide with or nearly coincide with the axis of the positioning segment 113 within the allowable error range. When the positioning segment 113 directly mates with the first welded pipe 100, an interference fit can be formed between the positioning segment 113 and the first welded pipe 100, thereby enabling the positioning segment 113 to seal the non-welded end of the first welded pipe 100. The material of the positioning segment 113 can be a material with a certain deformation capacity, such as rubber. Alternatively, a sealing fit can be achieved between the positioning segment 113 and the first welded pipe 100 by setting a sealing element.

[0062] The butt welding fixture may further include a plug 310, which is used to sealably pass through the non-welding end of the second welded pipe 200 to position the second welded pipe 200.

[0063] The welding fixture may further include a second sealing element 302, etc. The second sealing element 302 is fixedly disposed between the plug 310 and the second welded pipe 200. The second welded pipe 200 is sealed on the plug 310 by the second sealing element 302 to achieve sealing of the non-welded end of the second welded pipe 200.

[0064] The first seal 301 can be an O-ring, and the outer surface of the positioning mandrel 110 is machined with an O-ring groove. The second seal 302 can also be an O-ring.

[0065] The plug 310 may include a small-diameter section 311 and a large-diameter section 312. The diameter of the small-diameter section 311 is smaller than the diameter of the large-diameter section 312. A limiting step 313 is formed at the transition position between the small-diameter section 311 and the large-diameter section 312. The limiting step 313 is used to abut against the second welded pipe 200. A sealing groove 314 is provided on the outer surface of the small-diameter section 311. The sealing groove 314 is used to install the second sealing element 302. A limiting groove 315 is provided on the outer surface of the large-diameter section 312. The limiting groove 315 is used to cooperate with the fastening mechanism.

[0066] The first sealing element 301 and the second sealing element 302 work together to seal the gas and prevent leakage. The cooperation of the first sealing element 301 and the second sealing element 302 ensures that the threaded joint and the welded pipe are concentric, preventing bending after welding. Furthermore, due to the friction between the first sealing element 301 and the second sealing element 302 and the pipe wall after compression, relative rotation between the threaded joint and the welded pipe during welding is prevented. Specifically, the first sealing element 301 and the second sealing element 302 can be spaced a certain distance from the welding position to avoid being affected by the high temperature during welding. To further improve the service life of the first sealing element 301 and the second sealing element 302, the material of the first sealing element 301 and the second sealing element 302 can be high-temperature resistant fluororubber or perfluoroether rubber, etc.

[0067] In this embodiment, the fixing component may include a positioning element and a fastening mechanism. The positioning element is provided with a positioning surface of a predetermined shape and height. The plug 310 or the second welded tube 200 can be placed on the positioning surface so that the second welded tube 200 fitted on the plug 310 and the first welded tube 100 fitted on the positioning section 113 are aligned. The fastening mechanism is used to limit the plug 310 in the axial and circumferential directions.

[0068] The butt welding fixture provided in this application embodiment includes a positioning component for limiting the first welded pipe 100 and a fixing component for limiting the second welded pipe 200. The positioning component has a positioning mandrel 110 with a positioning section 113, and the fixing component has a positioning element with a positioning surface. The first welded pipe 100 is fitted onto the positioning section 113, thereby providing a precise radial reference for the first welded pipe 100 and stabilizing its axis after installation. The plug 310 or the second welded pipe 200 is placed on the positioning surface with a predetermined height and shape. Before welding, the positioning surface provides axial and radial support for the second welded pipe 200 or the plug 310. The dual reference points, combined with the positioning section 113 of the first welded pipe 100, ensure that the second welded pipe 200 can be precisely aligned with the first welded pipe 100 at the welding position, eliminating the need for repeated manual calibration and significantly improving alignment accuracy. During welding, the first welded pipe 100 is rotatably connected to the positioning section 113, allowing it to rotate relative to the fixing mechanism used to fix the positioning mandrel 110. This facilitates easy switching of welding positions, improves welding efficiency and weld quality stability, and avoids weld misalignment problems caused by traditional fixed positioning. It is especially suitable for pipeline scenarios requiring full circumference welding, ensuring uniform weld joint and reducing defects such as incomplete penetration and misalignment.

[0069] Simultaneously, the non-welded end of the first welded pipe 100 is sealed by the positioning section 113, and the non-welded end of the second welded pipe 200 is sealed by the plug 310 (if the welded end of the second welded pipe 200 is itself a closed end, then the plug 310 is not required for sealing). Furthermore, the positioning mandrel 110 is provided with an air inlet for introducing fluid to the first welded pipe 100 and the second welded pipe 200 after butt welding to verify the sealing performance. This allows for direct weld leak detection after welding, overcoming a series of problems caused by the current requirement to install pipelines in a pump system for weld leak detection, such as time-consuming and labor-intensive processes, downtime losses, and high production costs.

[0070] In this embodiment, the first welded tube 100 and the second welded tube 200 can be in the form of circular tubes. Specifically, the first welded tube 100 can be a ring-shaped circular tubular structure, which can be a connector with internal and / or external threads, or a plain tube, or other forms. This application does not impose a single limitation on this. Similarly, the second welded tube 200 can be a ring-shaped circular tubular structure, which can be a plain tube, or a connector with internal and / or external threads, or other forms. This application does not impose a single limitation on this.

[0071] In the embodiments and accompanying drawings of this application, the first welded pipe 100 is mainly illustrated by a threaded joint, and the second welded pipe 200 is mainly illustrated by a butt-welded pipe.

[0072] The following description will be provided in conjunction with the accompanying drawings and different embodiments.

[0073] Specifically, such as Figure 1 and Figure 2 As shown, in the first embodiment, the butt welding fixture may include a horizontal base 240, a fixing mechanism including a first vertical plate 120, a fixing component including a second vertical plate 220, etc.

[0074] The horizontal base 240 may specifically include a horizontal plate, which provides a reference for the horizontal installation of the first vertical plate 120 and the second vertical plate 220. The first vertical plate 120 and the second vertical plate 220 can be fixed to the horizontal base 240 with screws. The first vertical plate 120 is provided with a mounting hole 121, and the positioning mandrel 110 is installed in the mounting hole 121.

[0075] Specifically, the first vertical plate 120 can be fixed to the horizontal base 240 with screws. The positioning mandrel 110 is welded to the first vertical plate 120. One end of the positioning mandrel 110 is threaded to the pneumatic quick connector 500. The center of the positioning mandrel 110 is provided with an axially penetrating through hole 112 that communicates with the pneumatic quick connector 500. The outer surface of the positioning mandrel 110 is machined with a sealing groove 314, such as an O-ring groove, which contains an O-ring. One end of the threaded connector rests on the shaft platform of the mandrel. The inner hole of the threaded connector is positioned in conjunction with the outer circle of the positioning mandrel 110. The O-ring is located between the two to achieve a seal. One end of the butt-welded pipe rests against the threaded joint, and the other end is held in place by the limiting step 313 of the plug 310. The plug 310 is a stepped shaft. The outer circle of the small diameter section 311 of the plug 310 is positioned in conjunction with the inner hole of the butt-welded pipe, so that the center of the plug 310 is concentric with the center of the butt-welded pipe. A sealing groove 314 is machined on the outer circle of the small diameter section 311, and an O-ring is provided inside it. The O-ring is squeezed and located between the small diameter section 311 and the butt-welded pipe.

[0076] The fastening mechanism of the fixing component may include: a semi-enclosed pressure plate 410 with the opening facing downward and a fastener 420 detachably disposed on the semi-enclosed pressure plate 410. The semi-enclosed pressure plate 410 is provided with a fastening hole 411. The fastener 420 is installed on the semi-enclosed pressure plate 410 through the fastening hole 411, and the lower end of the fastener 420 abuts against the limiting groove 315.

[0077] Specifically, the second vertical plate 220 is fixedly mounted on the horizontal base 240 with screws. The second vertical plate 220 is machined with a positioning surface, which may include a symmetrically arranged first positioning inclined surface 221 and a second positioning inclined surface 222. The distance between the first positioning inclined surface 221 and the second positioning inclined surface 222 gradually increases from top to bottom. The outer circumferential surface of the large-diameter section 312 of the plug 310 rests on the positioning surface. The line contact support between the symmetrically arranged positioning inclined surfaces and the large-diameter section 312 of the plug 310 can adapt to the installation deviation of the plug 310, thereby improving the positioning stability of the plug 310, ensuring that the center of the plug 310 is coaxial with the center of the positioning mandrel 110, and indirectly ensuring the concentricity of the two welded parts.

[0078] A semi-enclosed pressure plate 410, roughly C-shaped, is fixedly installed on the second vertical plate 220 by screws. A fastening hole 411 can be provided in the middle of the semi-enclosed pressure plate 410. A set screw is inserted into the fastening hole 411. An annular limiting groove 315 is machined on the outer surface of the large diameter section 312 of the plug 310. The set screw is screwed into the semi-enclosed pressure plate 410, and the front end is pushed into the limiting groove 315 of the large diameter section 312 of the plug 310.

[0079] The engagement method of the fastener 420 being inserted into the limiting groove 315 changes the traditional surface contact clamping to groove positioning, which not only avoids damage to the outer circle of the welded pipe, but also improves the circumferential positioning accuracy of the plug 310, further ensuring concentricity.

[0080] The stepped shaft structure of the plug 310 enables the plug 310 to simultaneously achieve positioning of the inner hole of the welded pipe and axial limitation, which can simplify the positioning steps of the welded pipe and achieve integrated positioning and sealing with the O-ring; the cooperation between the sealing groove 314 and the fastener 420 not only prevents the plug 310 from being squeezed out by air pressure, but also avoids the rotation of the welded pipe, further improving the positioning reliability.

[0081] The combination of the through hole 112 on the positioning mandrel 110 and the pneumatic quick connector 500 enables the weld inspection and cooling to be completed simultaneously, which greatly improves the inspection efficiency; in addition, compressed air can also accelerate the cooling of the weld, reduce the welding thermal stress, and improve the crack resistance of the joint.

[0082] In practical use, after the positioning mandrel 110 is installed, the first sealing element 301 is fitted and inserted into the threaded connector; one end of the butt-welded pipe is connected to the threaded connector, and the other end is inserted into the small diameter section 311 of the plug 310, and the second sealing element 302 is sealed by compression; the large diameter section 312 of the plug 310 is placed on the positioning slope, and the fastener 420 is tightened so that it pushes into the limiting groove 315; after spot welding and shaping, the fastener 420 is loosened, the butt-welded pipe is rotated for full welding, and after full welding, the air pipe is connected to the pneumatic quick connector 500, compressed air is introduced to accelerate the cooling of the weld and detect leakage; after confirming that there is no leakage, the fastener 420 is loosened, the pipe is pulled out and the plug 310 is removed.

[0083] In this embodiment, the first vertical plate 120 and the second vertical plate 220 are set at a predetermined distance apart. The butt welding fixture further includes a first auxiliary support assembly, which includes a third vertical plate 230 located between the first vertical plate 120 and the second vertical plate 220. The positioning surface of the third vertical plate 230 is used to assist in supporting the second welded pipe 200.

[0084] When the welded pipe is long, a third vertical plate 230 can be fixedly connected between the first vertical plate 120 and the second vertical plate 220, near the weld seam, using screws. The third vertical plate 230 can be machined with a positioning slope, and its specific structure can be similar to that of the second vertical plate 220. This positioning slope can refer to the combination of the first positioning slope 221 and the second positioning slope 222 described above; specific details will not be elaborated here. The outer circle of the welded pipe rests on the positioning slope of the third vertical plate 230, and the upper part of the third vertical plate 230 can also be provided with a fastening mechanism similar to that of the upper part of the second vertical plate 220.

[0085] The C-shaped semi-enclosed pressure plate 410 is fixedly installed on the third vertical plate 230 with screws. A set screw is located in the middle of the C-shaped semi-enclosed pressure plate 410. After being screwed in, the set screw rests against the outer circumferential surface of the weld pipe, serving as an auxiliary support to prevent the weld pipe from bending due to its excessive length, which could affect the concentricity of the threaded joint and the weld pipe after welding. Furthermore, by setting this third vertical plate 230 as an intermediate support, the stress on the weld pipe is distributed, making the positioning of both ends more stable.

[0086] The number of the third vertical plates 230 can be one or more. Specifically, the number of the third vertical plates 230 can be designed according to the actual length of the welded pipe and the support requirements. This application does not make a unique numerical limit on the number of them.

[0087] Specifically, the butt welding fixture may further include: a horizontal base 240, on which the first vertical plate 120, the second vertical plate 220 and the third vertical plate 230 are all fixed.

[0088] This butt welding fixture, by setting a horizontal base 240, can provide a unified installation benchmark for three vertical plates, so that the axial deviation of the positioning surfaces of the three plates is controlled within a limited fluctuation range, ensuring the consistency of auxiliary positioning and positioning at both ends, and avoiding positioning interference caused by multiple supports; at the same time, the rigid structure of the base improves the overall seismic resistance of the fixture, and effectively reduces vibration deviation during welding.

[0089] like Figure 3As shown, in the second embodiment, the fixing mechanism includes a first vertical plate 120, on which a mounting hole 121 is provided. The butt welding fixture also includes a bearing 600, and the positioning mandrel 110 is installed in the mounting hole 121 through the bearing 600.

[0090] In this embodiment, the difference from the first embodiment is that a bearing 600 is provided in the mounting hole 121 provided on the first vertical plate 120, and the positioning spindle 110 is connected to the first vertical plate 120 through the bearing 600 to achieve free rotation.

[0091] During welding, first weld a few points between the threaded joint and the butt-welding pipe, loosen the set screw on the C-shaped semi-enclosed pressure plate 410, rotate the butt-welding pipe, thereby driving the threaded joint and the positioning mandrel 110 to rotate, and perform full welding on the weld. After welding is completed, connect the air pipe to the pneumatic quick connector 500, introduce compressed air, rotate the butt-welding pipe, and cool and inspect the weld. If there are any leaks, repair them in time. After confirming that there are no leaks, remove the air pipe from the pneumatic quick connector 500, pull the threaded joint out of the positioning mandrel 110, and remove the plug 310 at the rear end of the butt-welding pipe.

[0092] like Figure 4 As shown, in the third embodiment, the fixing mechanism includes a chuck 700, and the positioning spindle 110 is engaged in the chuck 700 and can be rotated by the chuck 700.

[0093] In this embodiment, the difference from the first embodiment is that the first vertical plate 120 in the first embodiment is omitted. Instead, the chuck 700 clamps the positioning mandrel 110 directly. First, the set screw is used to hold the weld pipe in place. Then, a few spots are welded at the weld seam. After cooling, the set screw is loosened, and the chuck 700 rotates, causing the positioning mandrel 110 to rotate. Because the positioning mandrel 110 and the threaded joint are compressed by the first sealing element 301 (e.g., an O-ring), the positioning mandrel 110 drives the threaded joint to rotate. This starts the automatic welding machine, completes the full weld seam, and then air is introduced to inspect the weld quality. This allows for direct clamping, spot welding, full welding, and finally air inspection in one operation, saving time and effort and improving processing efficiency and welding quality.

[0094] In one embodiment, the butt welding fixture may further include a second auxiliary support assembly, the second auxiliary support assembly including a fourth vertical plate, the fourth vertical plate being located between the first vertical plate and the third vertical plate, the fourth vertical plate being provided with a positioning surface for auxiliary support of the first welded pipe.

[0095] In this embodiment, when the length of the first welded pipe 100 is relatively long, a cantilever section is formed near the welding end of the first welded pipe 100, which can easily cause a shift in the positional accuracy of the welding end of the first welded pipe 100. To ensure the positional accuracy of the welding end of the first welded pipe 100, a second auxiliary support component can be provided near the welding end of the first welded pipe 100 for support, thereby ensuring the positional accuracy of the welding end of the first welded pipe 100. Specifically, the second auxiliary support component can refer to the form of the second vertical plate 220, or it can be other forms. Specifically, this application does not make a unique limitation.

[0096] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0097] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the others. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A butt welding fixture for welding a first weld pipe and a second weld pipe, characterized in that, The butt welding fixture includes: A positioning assembly includes a positioning mandrel and a fixing mechanism for fixing the positioning mandrel. The positioning mandrel has a positioning section for inserting into the non-welded end of the first welded tube to position the first welded tube. The positioning section has an annular groove, and a first sealing element is fixed in the annular groove. The first sealing element is used to form a seal between the first welded tube and the positioning section. A fixing component is used to fix the second welded tube and align the second welded tube with the first welded tube; The positioning mandrel is provided with an air inlet for introducing fluid into the first welded tube and the second welded tube after butt welding to verify the sealing performance.

2. The butt welding fixture as described in claim 1, characterized in that, The butt welding fixture also includes: A plug, which is used to be sealed through the non-welded end of the second welded pipe to position the second welded pipe; and a second sealing element, which is disposed between the plug and the second welded pipe to seal the non-welded end of the second welded pipe. The fixing component includes a positioning element and a fastening mechanism. The positioning element is used to position the plug or the second welded pipe, and the fastening mechanism is used to limit the plug or the second welded pipe in the axial and circumferential directions.

3. The butt welding fixture as described in claim 2, characterized in that, The air inlet is a through hole arranged along the axial direction.

4. The butt welding fixture as described in claim 2, characterized in that, The plug includes a small-diameter section and a large-diameter section, the diameter of the small-diameter section being smaller than the diameter of the large-diameter section. A limiting step is formed at the transition position between the small-diameter section and the large-diameter section, and the limiting step is used to abut against the second welded pipe. A sealing groove is provided on the outer surface of the small-diameter section, and the sealing groove is used to install the second sealing element. A limiting groove is provided on the outer surface of the large-diameter section, and the limiting groove is used to cooperate with the fastening mechanism.

5. The butt welding fixture as described in claim 4, characterized in that, The fastening mechanism includes: a semi-enclosed pressure plate with its opening facing downwards and a fastener detachably disposed on the semi-enclosed pressure plate. The semi-enclosed pressure plate is provided with a fastening hole, and the fastener is installed on the semi-enclosed pressure plate through the fastening hole. The lower end of the fastener abuts against the limiting groove.

6. The butt welding fixture as described in claim 2, characterized in that, The fixing mechanism includes a first vertical plate with a mounting hole, and the positioning mandrel is installed in the mounting hole; or, the butt welding fixture further includes a bearing, and the positioning mandrel is installed in the mounting hole through the bearing; or, the fixing mechanism includes a chuck, and the positioning mandrel is engaged in the chuck and can be rotated by the chuck.

7. The butt welding fixture as described in claim 6, characterized in that, The positioning component includes a second vertical plate, and the positioning surface of the second vertical plate includes a first positioning inclined surface and a second positioning inclined surface arranged symmetrically, with the distance between the first positioning inclined surface and the second positioning inclined surface gradually increasing from top to bottom.

8. The butt welding fixture as described in claim 7, characterized in that, The first vertical plate and the second vertical plate are set at a predetermined distance apart. The butt welding fixture further includes: a first auxiliary support assembly, the first auxiliary support assembly including a third vertical plate, the third vertical plate being located between the first vertical plate and the second vertical plate, and the third vertical plate having a positioning surface for auxiliary support of the second welded pipe.

9. The butt welding fixture as described in claim 8, characterized in that, The butt welding fixture further includes a horizontal base, on which the first vertical plate, the second vertical plate, and the third vertical plate are all fixed.

10. The butt welding fixture as described in claim 8, characterized in that, The butt welding fixture also includes a second auxiliary support assembly, which includes a fourth vertical plate located between the first vertical plate and the third vertical plate. The fourth vertical plate has a positioning surface for auxiliary support of the first welded pipe.

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