Pipeline butt welding tool

Abstract

The utility model discloses a pipeline butt welding tool, which is used for fixing and aligning a first welding pipe and a second welding pipe to be welded, and comprises a positioning component, the positioning component comprises a positioning core shaft and a fixing mechanism for fixing the positioning core shaft, the positioning core shaft is provided with a positioning section, and the positioning section is provided with a positioning hole; the first welding pipe can be rotatably arranged on the positioning section in a sleeving manner to realize positioning; the fixing assembly comprises a positioning piece and a fastening mechanism, the positioning piece is provided with a positioning surface with a preset shape and height, and the second welding pipe placed on the positioning surface and the first welding pipe arranged on the positioning section in a sleeving mode are located at the alignment position; and the fastening mechanism is used for pressing the second welding pipe on the positioning surface to realize limiting in the axial direction and the circumferential direction. The two welding pipes can be accurately positioned and conveniently welded, so that the requirements of a modern pump pipeline system on welding quality and operation efficiency are better met.

Description

Technical Field

[0001] This utility model relates to the field of pipeline butt welding technology, and in particular to a pipeline 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 exacerbating assembly difficulties.

[0005] Therefore, it is necessary to propose a pipe butt welding fixture to solve at least one of the above problems. Utility Model Content

[0006] In view of the shortcomings of the existing technology, this utility model provides a pipe butt welding fixture, which enables precise positioning and convenient welding of two pipes, thereby better meeting the requirements of modern pump pipeline systems for welding quality and operation efficiency.

[0007] The specific technical solution of this utility model embodiment is as follows:

[0008] A pipe butt welding fixture is provided for fixing and aligning a first weld pipe and a second weld pipe to be welded. The pipe butt welding fixture includes: a positioning component, which includes a positioning mandrel and a fixing mechanism for fixing the positioning mandrel. The positioning mandrel has a positioning section, and the first weld pipe can be rotatably fitted onto the positioning section for positioning; and a fixing component, which includes a positioning element and a fastening mechanism. The positioning element has a positioning surface of a predetermined shape and height, so that the second weld pipe placed on the positioning surface and the first weld pipe fitted onto the positioning section are aligned. The fastening mechanism is used to press the second weld pipe onto the positioning surface to achieve axial and circumferential direction limiting.

[0009] In a preferred embodiment, the positioning mandrel is fixedly mounted on the fixing mechanism, the fixing mechanism including a first vertical plate, one end of the positioning mandrel being positioned by the first vertical plate, and the other end of the positioning mandrel being used to pass through the first welded pipe.

[0010] In a preferred embodiment, a countersunk hole is provided on the first vertical plate, and one end of the positioning mandrel is embedded in the countersunk hole and positioned and engaged with the side wall of the countersunk hole.

[0011] In a preferred embodiment, the first vertical plate is further provided with a bottom hole that passes through the countersunk hole, the positioning mandrel is provided with a threaded hole, and the fixing mechanism further includes a screw, which passes through the bottom hole and engages with the threaded hole to achieve fixing.

[0012] In a preferred embodiment, the positioning mandrel is a stepped shaft, and the positioning mandrel further includes a fixing section for cooperating with the fixing mechanism. The diameter of the fixing section is larger than the diameter of the positioning section, and a stepped limiting portion is formed between the fixing section and the positioning section. The limiting portion is used to abut against the non-welded end of the first welded pipe.

[0013] 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 horizontal distance between the first positioning inclined surface and the second positioning inclined surface gradually decreasing from top to bottom.

[0014] 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 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 can abut against the second welded pipe.

[0015] In a preferred embodiment, the pipe butt welding fixture further includes a horizontal base, on which both the first vertical plate and the second vertical plate are fixed.

[0016] In a preferred embodiment, the pipe butt welding fixture further includes a support member for supporting the welding end near the first welded pipe; the support member includes a support surface, the support surface including a first support inclined surface and a second support inclined surface symmetrically arranged, the horizontal distance between the first support inclined surface and the second support inclined surface gradually decreasing from top to bottom.

[0017] In a preferred embodiment, the positioning assembly is provided with a ball bearing, and the positioning mandrel is fixed to the ball bearing.

[0018] The technical solution of this utility model has the following significant beneficial effects:

[0019] The pipe butt welding fixture provided in this application embodiment 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 is placed on a positioning surface with a predetermined height and shape. Before welding, this positioning surface provides a dual axial and radial reference for the second welded pipe, in conjunction with... 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.

[0020] 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

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the structure of a pipe butt welding fixture provided in the embodiments of this application;

[0023] Figure 2 This is a right view of the structure of a pipe butt welding fixture provided in the embodiments of this application.

[0024] Figure 3 This is a schematic diagram of another pipeline butt welding fixture provided in the embodiments of this application;

[0025] Figure 4 This is a structural schematic diagram of another pipeline butt welding fixture provided in the embodiments of this application.

[0026] The reference numerals in the above figures are as follows:

[0027] 100. First welded pipe;

[0028] 200. Second welded pipe;

[0029] 110. Positioning mandrel;

[0030] 111. Limiting part;

[0031] 112. Through hole;

[0032] 113. Positioning segment;

[0033] 114. Threaded hole;

[0034] 115. Fixed section;

[0035] 120. First vertical plate;

[0036] 121. Mounting holes;

[0037] 122. Countersunk hole;

[0038] 123. Bottom hole;

[0039] 220. The second vertical plate;

[0040] 221. First positioning inclined plane;

[0041] 222. Second positioning inclined plane;

[0042] 230. The third vertical plate;

[0043] 240. Horizontal base;

[0044] 8. Screws;

[0045] 301. First sealing element;

[0046] 302. Second sealing element;

[0047] 310. Plug;

[0048] 311. Small-diameter section;

[0049] 312. Large diameter section;

[0050] 313. Limiting step;

[0051] 314. Sealing groove;

[0052] 315. Limiting groove;

[0053] 410. Semi-enclosed pressure plate;

[0054] 411. Fastening hole;

[0055] 420. Fasteners;

[0056] 500. Pneumatic quick-connect coupling;

[0057] 600. Ball bearing. Detailed Implementation

[0058] 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.

[0059] 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.

[0060] This utility model provides a pipe butt welding fixture that enables precise positioning and convenient welding of at least two pipes, thereby better meeting the requirements of modern pump pipeline systems for welding quality and operational efficiency.

[0061] Please refer to the following for comprehensive information. Figures 1 to 4 This application specification provides a pipe butt welding fixture, which may include: a positioning component, the positioning component including a positioning mandrel 110 and a fixing mechanism for fixing the positioning mandrel 110, the positioning mandrel 110 having a positioning section 113, the first welding pipe 100 being rotatably fitted onto the positioning section 113 of the positioning mandrel 110 for positioning; and a fixing component, the fixing component including a positioning element and a fastening mechanism, the positioning element having a positioning surface of a predetermined shape and height, so that the second welding pipe placed on the positioning surface and the first welding pipe 100 fitted onto the positioning section are aligned, and the fastening mechanism is used to press the second welding pipe 200 against the positioning surface to achieve axial and circumferential direction limiting.

[0062] The positioning mandrel 110 can be in the form of a stepped shaft. It may include a fixing section 115 for cooperating with a fixing mechanism and a positioning section 113 for mounting the first welded pipe 100. The diameter of the fixing section 115 is larger than the diameter of the positioning section 113. A stepped limiting portion 111 is formed between the fixing section 115 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. 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 section 113 is circular, the diameter of the positioning section 113 can be adapted to the aperture of the first welded pipe 100. For example, the two can be the same or close to each other, ensuring that after the first welded pipe 100 is installed on the positioning section 113, its axis can coincide with the axis of the positioning section 113 or closely coincide within the allowable error range.

[0063] The pipe butt welding fixture provided in this embodiment of the application 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 fitting. The second welded pipe 200 is placed on a positioning surface with a predetermined height and shape. Before welding, this positioning surface provides a dual axial and radial reference for the second welded pipe 200. The positioning section 113 of the first welded pipe 100 ensures 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 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 joint and reducing defects such as incomplete penetration and misalignment.

[0064] The following description will be provided in conjunction with the accompanying drawings and different embodiments.

[0065] Please refer to the following: Figure 1 and Figure 2In one embodiment, the positioning mandrel 110 is fixedly mounted on the fixing mechanism, which includes a first vertical plate 120. One end of the positioning mandrel 110 is positioned by the first vertical plate 120, and the other end of the positioning mandrel 110 is used to pass through the first welded pipe 100.

[0066] Specifically, the first vertical plate 120 is provided with a countersunk hole 122, and one end of the positioning mandrel 110 is positioned through the countersunk hole 122. Specifically, one end of the positioning mandrel 110 is embedded in the countersunk hole 122 and is positioned and cooperated with the side wall of the countersunk hole 122. The other end of the positioning mandrel 110 is used to pass through the first welded pipe 100.

[0067] The positioning mandrel 110 can be fitted with the countersunk hole 122 with a clearance or with zero clearance. The first vertical plate 120 is also provided with a bottom hole 123 that passes through the countersunk hole 122, and the positioning mandrel 110 is provided with a threaded hole 114. The fixing mechanism also includes a screw 8, which passes through the bottom hole 123 and engages with the threaded hole 114 to achieve fixation.

[0068] like Figure 2 As shown, further, the positioning component may include a second vertical plate 220, the positioning surface of the second vertical plate 220 including a first positioning inclined surface 221 and a second positioning inclined surface 222 symmetrically arranged, the distance between the first positioning inclined surface 221 and the second positioning inclined surface 222 gradually decreasing from top to bottom; the fastening mechanism includes 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 can abut against the second welded pipe 200.

[0069] In the embodiments described in this application, the first welded pipe 100 and the second welded pipe 200 can be in the form of circular pipes. Specifically, the first welded pipe 100 can be a ring-shaped circular tubular structure, which can be in the form of a joint with internal and / or external threads, or it can be a plain pipe, or it can be other forms. This application does not impose a single limitation on this. Similarly, the second welded pipe 200 can be a ring-shaped circular tubular structure, which can be in the form of a plain pipe, or it can be in the form of a joint with internal and / or external threads, or it can be other forms. This application does not impose a single limitation on this.

[0070] 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.

[0071] The pipe butt welding fixture may include a horizontal base 240, a first vertical plate 120, and a fixing assembly including a second vertical plate 220.

[0072] The horizontal base 240 may specifically include a horizontal plate for providing a reference for the horizontal mounting of the first vertical plate 120 and the second vertical plate 220. The first vertical plate 120 and the second vertical plate 220 may be fixed to the horizontal base 240 with screws.

[0073] The first vertical plate 120 has an inner surface facing the second vertical plate 220 along its thickness direction. A countersunk hole 122 is machined on this inner surface. One end of the positioning mandrel 110 is precisely positioned through the countersunk hole 122 and fixed with a screw, while the other end is used to mount the first welded pipe 100 (e.g., a threaded connector). The positioning mandrel 110, mounted on the countersunk hole 122, extends horizontally, parallel to the horizontal base 240. A pivot may be provided on the positioning mandrel 110, which serves as a limiting part 111 to axially limit one end of the threaded connector, preventing it from moving along the positioning mandrel 110.

[0074] The countersunk hole 122 structure of the first vertical plate 120 provides a dual positioning reference for the positioning mandrel 110 in both radial and axial directions, which keeps the installation error of the positioning mandrel 110 within a small error range, greatly improves the installation accuracy of the positioning mandrel 110, and thus ensures the positioning stability of the first welded pipe 100 and avoids concentricity deviation caused by mandrel shaking.

[0075] The fixing assembly may include: a second vertical plate 220, a semi-enclosed pressure plate 410, and fasteners 420 (e.g., set screws). The second vertical plate 220 is fixed to the horizontal base 240, and its positioning surfaces are a first positioning inclined surface 221 and a second positioning inclined surface 222 symmetrically arranged. The distance between the two inclined surfaces gradually decreases from top to bottom, forming a V-shaped support structure for placing the second welded pipe 200 (e.g., butt-welded pipe). The symmetrically arranged positioning inclined surfaces form an adaptive V-shaped support, which can accommodate butt-welded pipes with different roundness within the same pipe diameter range. On the one hand, it can improve the adaptability of the tooling to the workpiece; on the other hand, the V-shaped structure can automatically center the butt-welded pipe, reducing manual adjustment time.

[0076] The semi-enclosed pressure plate 410 is fixed to the second vertical plate 220 by screws. A fastening hole 411 can be machined in the middle of the semi-enclosed pressure plate 410. After the fastener 420 passes through the fastening hole 411, its lower end can directly abut against the welded pipe. The combination of the semi-enclosed pressure plate 410 and the fastener 420 realizes the rapid fixing and release of the welded pipe, effectively improving the clamping efficiency.

[0077] In practical use, tooling debugging can be performed first: select a positioning mandrel 110 with a matching diameter according to the pipe diameter, and fix it to the first vertical plate 120 through the countersunk hole 122 to ensure that the axis of the positioning mandrel 110 is horizontal; then clamp the workpiece: put the threaded connector on the positioning mandrel 110 and close it to the shaft table for limiting, place the butt-welded pipe on the positioning inclined surface of the second vertical plate 220, so that the welding ends of the two are precisely connected. At this time, the V-shaped structure of the positioning inclined surface cooperates with the positioning mandrel 110 to ensure that the centers of the two workpieces are concentric; then tighten the positioning: tighten the fastener 420 on the semi-enclosed pressure plate 410 so that its lower end abuts against the outer circle of the butt-welded pipe to prevent rotation during welding; then perform the welding operation: first spot weld 3-4 points around the weld seam to shape it, loosen the fastener 420, and rotate the butt-welded pipe to complete the full welding; finally remove the workpiece: after welding, simply pull the welded pipe out from the positioning mandrel 110.

[0078] Overall, the pipe butt welding fixture structure provided in this embodiment fundamentally solves the problem of easy eccentricity in traditional manual clamping by using a dual positioning structure where the positioning component limits the first welded pipe 100 and the fixing component positions the second welded pipe 200. This achieves precise concentric alignment of the two welded pipes. At the same time, clamping only requires two steps: fitting and tightening the screws. The overall structure is simple, low-cost, and easy to operate, and can meet the requirements of modern pump pipeline systems for welding quality and operational efficiency.

[0079] Wherein, when the length of the first welded pipe 100 is greater than the preset length, the pipe butt welding fixture also includes a support member, which is used to support the welding end near the first welded pipe 100.

[0080] In this embodiment, when the length of the first welded pipe 100 is relatively long, a cantilever section is formed near the welded end of the first welded pipe 100, which can easily cause the positional accuracy of the welded end of the first welded pipe 100 to shift. In order to ensure the positional accuracy of the welded end of the first welded pipe 100, a support member can be provided near the welded end of the first welded pipe 100 for support, thereby ensuring the positional accuracy of the welded end of the first welded pipe 100.

[0081] The support member includes a support surface, which includes a first support inclined surface and a second support inclined surface arranged symmetrically, and the horizontal distance between the first support inclined surface and the second support inclined surface gradually decreases from top to bottom.

[0082] Specifically, the support member can be in the form of the second vertical plate 220, or it can be in other forms. However, this application does not make a single limitation.

[0083] Please refer to the following: Figure 3 and Figure 4 The pipeline butt welding fixture can also be integrated with an airtightness detection function.

[0084] The pipeline butt welding fixture may also include: a first sealing element 301, a second sealing element 302, and a plug 310, etc.

[0085] The first sealing element 301 is disposed between the positioning mandrel 110 and the first welded pipe 100. The second sealing element 302 is disposed between the plug 310 and the second welded pipe 200, and the second welded pipe 200 is sealed and fitted onto the plug 310 by the second sealing element 302; the positioning mandrel 110 is provided with a through hole 112 along the axial direction, and the through hole 112 is used to introduce fluid to verify the sealing performance into the first welded pipe 100 and the second welded pipe 200 after the pipe is butt-welded.

[0086] The first sealing element 301 can be an O-ring, and the outer surface of the positioning mandrel 110 is machined with an O-ring groove. The second sealing element 302 can also be an O-ring. The plug 310 includes 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.

[0087] 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.

[0088] Specifically, such as Figure 3 As shown, in one embodiment, the first vertical plate 120 is fixed to the horizontal base 240 by screws, and the positioning mandrel 110 is welded to the first vertical plate 120. One end of the positioning mandrel 110 is threaded to a pneumatic quick connector 500. A through hole 112 is machined in the center of the positioning mandrel 110 to communicate with the pneumatic quick connector 500. A sealing groove 314, such as an O-ring groove, is machined on the outer surface of the positioning mandrel 110, and an O-ring is provided in the groove. One end of the threaded connector rests on the shaft of the mandrel, and 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.

[0089] 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.

[0090] 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 decreases 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 pipes.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] In this embodiment, the first vertical plate 120 and the second vertical plate 220 are arranged at a predetermined distance apart. The pipe butt welding fixture further includes an 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] Specifically, the pipe 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.

[0101] This pipe 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.

[0102] like Figure 4 As shown, in one embodiment, the fixing mechanism includes a first vertical plate 120, on which a mounting hole 121 is provided. The pipeline butt welding fixture also includes a ball bearing 600, and the positioning mandrel 110 is installed in the mounting hole 121 through the ball bearing 600.

[0103] In this embodiment, the difference from the above embodiment is that a ball 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 ball bearing 600 to achieve free rotation.

[0104] 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.

[0105] 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.

[0106] 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 pipe butt welding fixture for fixing and aligning a first weld pipe and a second weld pipe to be welded, characterized in that, include: A positioning assembly, comprising a positioning mandrel and a fixing mechanism for fixing the positioning mandrel, wherein the positioning mandrel is provided with a positioning section, and the first welded tube can be rotatably fitted onto the positioning section to achieve positioning; The fixing component includes a positioning element and a fastening mechanism. The positioning element has a positioning surface of a predetermined shape and height, so that the second welded pipe placed on the positioning surface and the first welded pipe fitted on the positioning segment are aligned. The fastening mechanism is used to press the second welded pipe onto the positioning surface to achieve axial and circumferential direction limiting.

2. The pipe butt welding fixture as described in claim 1, characterized in that, The positioning mandrel is fixedly mounted on the fixing mechanism, which includes a first vertical plate. One end of the positioning mandrel is positioned by the first vertical plate, and the other end of the positioning mandrel is used to pass through the first welded tube.

3. The pipe butt welding fixture as described in claim 2, characterized in that, The first vertical plate is provided with a countersunk hole, and one end of the positioning mandrel is embedded in the countersunk hole and positioned and engaged with the side wall of the countersunk hole.

4. The pipe butt welding fixture as described in claim 3, characterized in that, The first vertical plate is also provided with a bottom hole that passes through the countersunk hole, the positioning mandrel is provided with a threaded hole, and the fixing mechanism also includes a screw, which passes through the bottom hole and cooperates with the threaded hole to achieve fixing.

5. The pipe butt welding fixture as described in claim 1, characterized in that, The positioning mandrel is a stepped shaft, and the positioning mandrel also includes a fixing section for cooperating with the fixing mechanism. The diameter of the fixing section is larger than the diameter of the positioning section. A stepped limiting part is formed between the fixing section and the positioning section. The limiting part is used to abut against the non-welded end of the first welded pipe.

6. The pipe butt welding fixture as described in claim 2, 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 horizontal distance between the first positioning inclined surface and the second positioning inclined surface gradually decreasing from top to bottom.

7. The pipe butt welding fixture as described in claim 6, characterized in that, The fastening mechanism includes a semi-enclosed pressure plate with its opening facing downwards and fasteners detachably mounted on the semi-enclosed pressure plate. The semi-enclosed pressure plate is provided with fastening holes, and the fasteners are mounted on the semi-enclosed pressure plate through the fastening holes. The lower end of the fasteners can abut against the second welded pipe.

8. The pipe butt welding fixture as described in claim 6, characterized in that, The pipe butt welding fixture also includes a horizontal base, on which the first vertical plate and the second vertical plate are fixed.

9. The pipe butt welding fixture as described in claim 1, characterized in that, The pipe butt welding fixture also includes a support member, which is used to support the welding end near the first welded pipe; The support member includes a support surface, which includes a first support inclined surface and a second support inclined surface arranged symmetrically, and the horizontal distance between the first support inclined surface and the second support inclined surface gradually decreases from top to bottom.

10. The pipe butt welding fixture as described in claim 1, characterized in that, The positioning component is equipped with a ball bearing, and the positioning mandrel is fixed on the ball bearing.

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