A method for positioning a workpiece in a welding fixture

Abstract

The application discloses a welding tool and workpiece positioning method convenient to fix, belongs to the technical field of welding, and comprises a driving table including a linkage mechanism; the linkage mechanism comprises a linkage gear, and a first toothed plate and a second toothed plate which are slidably arranged; the linkage gear is meshed with the first toothed plate and the second toothed plate respectively; a clamping mechanism is arranged on the first toothed plate; the clamping mechanism comprises a rotating seat which is rotatably arranged; an inner wall of the rotating seat in the axial direction is provided with a clamping cavity; a pipe to be welded is arranged in the clamping cavity; a supporting and guiding piece is arranged on the second toothed plate; the supporting and guiding piece comprises a supporting arc frame which is used for bearing the pipe to be welded. Through the gear-toothed plate linkage transmission structure, synchronous reverse linkage sliding of the clamping part and the supporting part can be realized, automatic centering, rapid positioning and end face accurate splicing of two pipes to be welded can be completed at one time, manual repeated calibration and alignment are not needed, and the clamping process is greatly simplified.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a convenient and fixed welding fixture and workpiece positioning method. Background Technology

[0002] Ductile iron pipes possess comprehensive advantages such as high strength, excellent toughness, and strong corrosion resistance, and are widely used in various pressure pipeline engineering scenarios, including municipal water supply, drainage, and gas transmission. In the actual production and processing stage, welding is often required to adapt to the personalized needs of different engineering conditions and pipeline connection methods. Currently, the industry generally adopts manual welding for the outer ring welding process of ductile iron pipe ends, relying on operators to use welding tools to complete the circumferential welding operation along the pipe circumference.

[0003] Chinese patent application CN121267545A discloses a circumferential welding device for a thermal power plant pipeline system, including a positioning clamping group for fixing the pipeline. The device also includes an adjustment group, located on one side of the positioning clamping group. The adjustment group includes a movable sliding block, with a mounting seat attached to the upper end of the sliding block via multiple spring telescopic rods. This invention automatically guides the moving pipeline through the alignment welding group and the circumferentially evenly distributed guide pre-reserved group. It also provides adaptive fine-tuning during the docking of two pipelines, providing real-time feedback on coaxiality to ensure that the ends of the two pipelines are coaxially distributed with the support ring. This eliminates the need for repeated manual calibration and allows for the determination of the weld width between the two pipelines during a single alignment process, eliminating the need for repeated checks and adjustments of the pipeline spacing using feeler gauges, thus improving the efficiency of pipeline welding.

[0004] However, the welding equipment disclosed above generally has limited flexibility and welding effect, and cannot quickly position or splice pipelines. Summary of the Invention

[0005] The purpose of this invention is to provide a convenient and fixed welding fixture to solve the problems of limited freedom of movement and poor welding effect of existing welding equipment, as well as the inability to quickly position and splice pipes.

[0006] To achieve the above objectives, the technical solution of the present invention is: a welding fixture that is easy to fix, comprising: The drive platform includes a linkage mechanism; the linkage mechanism includes a linkage gear, and a first toothed plate and a second toothed plate that are slidably disposed thereon; the linkage gear meshes with the first toothed plate and the second toothed plate respectively; A clamping mechanism is disposed on the first toothed plate; it includes a rotating seat that is rotatably disposed, and a clamping cavity is formed on the axial inner wall of the rotating seat, and a pipe fitting to be welded is disposed in the clamping cavity; A support guide is disposed on the second toothed plate; it includes a support arc frame, which is used to support the pipe fitting to be welded.

[0007] As a further embodiment of the present invention: the clamping mechanism further includes: a mounting base disposed on the first toothed plate; the mounting base has a through rotating cavity, and the rotating seat is rotatably disposed in the rotating cavity.

[0008] As a further embodiment of the present invention: a limiting groove is formed on the radial inner wall of the rotating cavity, and a limiting rail is provided on the radial inner wall of the rotating seat; the limiting rail is rotatably disposed in the limiting groove. A meshing seat is provided on the axial outer wall of one end of the rotating seat; the mounting seat further includes: a rotary motor, which is disposed on the main body of the mounting seat; a drive gear is installed at the output end of the rotary motor; and a belt is wound around the drive gear and the meshing seat.

[0009] As a further embodiment of the present invention: a squeezing cavity is provided on the axial outer wall of the other end of the rotating seat; an annular seat is provided between the squeezing cavity and the clamping cavity; The clamping mechanism further includes a positioning element, which is slidably disposed on the annular seat; used to lock the radial inner wall of the pipe to be welded.

[0010] As a further embodiment of the present invention: the annular seat is provided with a telescopic cavity; the two ends of the telescopic cavity are respectively connected to the extrusion cavity and the clamping cavity; the positioning member is slidably disposed in the telescopic cavity, the positioning member is provided with a positioning arc plate on the side facing the pipe to be welded, and the positioning member is provided with a first arc surface on the side away from the pipe to be welded; The clamping mechanism further includes: a pressing member, rotatably disposed in the pressing chamber; the pressing member includes a second arc surface, the second arc surface being used to abut against the first arc surface.

[0011] As a further embodiment of the present invention: the extrusion chamber is provided with a reset chamber, and the reset chamber is in communication with the telescopic chamber; The positioning component includes a reset spring; one end of the reset spring is connected to the main body of the positioning component, and the other end is connected to the inner wall of the reset cavity. The clamping mechanism also includes a clamping motor; the output end of the clamping motor is connected to the extrusion piece via a transmission connection.

[0012] As a further embodiment of the present invention: the drive platform further includes a dual-axis cylinder; the output ends of the dual-axis cylinder are respectively connected to the second toothed plate; The drive platform also includes a protective cover; the protective cover is used to protect the dual-axis cylinder; the drive platform also includes a collection component; the collection component is disposed below the contact point of the pipe fitting to be welded, and is used to collect welding slag; The driver console also includes a control panel.

[0013] As a further embodiment of the present invention: a rubber pad is provided on the radial inner wall of the clamping cavity; an anti-slip groove is provided on the outer wall of the positioning arc plate; The drive platform is provided with a linkage groove; the linkage gear is rotatably disposed in the linkage groove; the drive platform is provided with a first sliding groove and a second sliding groove; the first sliding groove and the second sliding groove are respectively located on both sides of the linkage groove; the first sliding groove and the second sliding groove are respectively connected to the linkage groove; the first toothed plate is slidably disposed in the first sliding groove, and the second toothed plate is slidably disposed in the second sliding groove.

[0014] As a further embodiment of the present invention: a groove is formed on the inner wall of the supporting arc frame facing the pipe to be welded; a ball bearing is rotatably disposed in the groove; the pipe to be welded abuts against the ball bearing.

[0015] As a further embodiment of the present invention: a workpiece positioning method for a conveniently fixed welding fixture, comprising: installing two pipe fittings to be welded on the support arc frames on both sides respectively; sliding the pipe fittings to be welded toward the clamping cavity and clamping the pipe fittings to be welded respectively; driving the second toothed plate to slide relative to each other; the clamping mechanisms on both sides moving closer to the center, and the support arc frames on both sides sliding outwards to approach the clamping mechanisms; the pipe fittings to be welded on both sides abutting.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a gear-tooth plate linkage transmission structure to achieve synchronous reverse linkage sliding between the clamping and supporting parts. This enables automatic centering, rapid positioning, and precise end-face splicing of two pipe fittings to be welded in a single operation, eliminating the need for repeated manual calibration and significantly simplifying the clamping process. The bidirectional clamping structure, employing external clamping combined with internal radial tightening, allows for simultaneous centering and limiting from both the inner and outer walls of the pipe fitting. This automatically corrects the coaxiality of the pipe fitting, effectively preventing clamping eccentricity and radial offset issues, while also increasing the clamping contact friction to prevent circumferential slippage of the pipe fitting during rotary welding.

[0017] The clamping section features a rotatable assembly structure, enabling the clamped and fixed pipe fitting to rotate uniformly in a circumferential direction. Combined with the bottom rolling support structure, this converts the sliding friction between the pipe fitting and the support structure into rolling friction. The overall structure is compact and integrated, highly versatile, structurally rigid, and exhibits outstanding operational stability and durability. Attached Figure Description

[0018] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is the overall three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is the overall three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a three-dimensional structural diagram of the drive stage in this invention; Figure 4 This is the three-dimensional structure of the clamping mechanism in this invention. Figure 1 ; Figure 5 This is the three-dimensional structure of the clamping mechanism in this invention. Figure 2 ; Figure 6 This is a three-dimensional structural diagram of the clamping mechanism in this invention; Figure 7 This is a cross-sectional view of the clamping mechanism in this invention. Figure 1 ; Figure 8 This is a cross-sectional view of the clamping mechanism in this invention. Figure 2 ; Figure 9 This is a cross-sectional view of the supporting guide component in this invention; Figure 10 yes Figure 9 Enlarged view of the structure at point A in the middle.

[0019] Explanation of reference numerals in the attached figures: 100. Drive stage; 110. Linkage gear; 111. Linkage groove; 120. First toothed plate; 121. First sliding groove; 130. Second toothed plate; 131. Second sliding groove; 140. Twin-shaft cylinder; 150. Protective cover; 160. Collection component; 170. Control panel; 200. Clamping mechanism; 210. Mounting base; 211. Rotating cavity; 212. Limiting groove; 213. Rotary motor; 214. Drive wheel; 215. Belt; 220. Rotating seat; 221. Limiting rail; 222. Clamping cavity; 223. Rubber pad; 224. Engaging seat; 230. Compression chamber; 231. Annular seat; 232. Telescopic chamber; 233. Reset chamber; 240. Positioning component; 241. Positioning arc plate; 242. Return spring; 243. First arc surface; 250. Clamping motor; 251. Extruded part; 252. Second arc surface; 300. Supporting guide components; 310. Supporting arc frame; 311. Groove; 312. Ball bearing; 400. Pipe fittings to be welded. Detailed Implementation

[0020] The following will be combined with the appendix Figures 1 to 10 The technical solutions of the present invention have been clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] This invention provides, through improvements, a welding fixture that is convenient for fixing, such as... Figures 1-10 As shown, including; The drive platform 100 includes a linkage mechanism; the linkage mechanism includes a linkage gear 110, and a first toothed plate 120 and a second toothed plate 130 that are slidably disposed thereon; the linkage gear 110 meshes with the first toothed plate 120 and the second toothed plate 130 respectively. The clamping mechanism 200 is disposed on the first toothed plate 120; it includes a rotating seat 220 that is rotatably disposed, and a clamping cavity 222 is provided on the axial inner wall of the rotating seat 220, and a pipe fitting 400 to be welded is disposed in the clamping cavity 222. A support guide 300 is disposed on the second toothed plate 130; it includes a support arc frame 310, which is used to support the pipe fitting 400 to be welded.

[0025] In this embodiment, the linkage gear 110 in the drive platform 100 simultaneously forms a gear and rack meshing transmission pair with the first toothed plate 120 and the second toothed plate 130. Utilizing the synchronous reversing meshing characteristic of the linkage gear 110, when either the first toothed plate 120 or the second toothed plate 130 is subjected to force and slides, the linkage gear 110 can be driven to rotate, thereby driving the other toothed plate to perform synchronous equidistant sliding in the opposite direction, realizing the linkage and reverse displacement of the two toothed plates.

[0026] In this embodiment: the clamping mechanism 200 is fixedly mounted on the first toothed plate 120 and can move linearly synchronously with the first toothed plate 120. The rotating seat 220 of the clamping mechanism 200 can rotate on its own, and the clamping cavity 222 opened in its axial direction can accommodate and limit the pipe fitting 400 to be welded. The internal cavity structure of the clamping cavity 222 forms a radial wrapping and limiting of the pipe fitting 400 to be welded. At the same time, the rotating seat 220 can drive the pipe fitting 400 to be welded inside the clamping cavity 222 to rotate circumferentially, which meets the circumferential feeding requirements of circumferential welding.

[0027] The support guide 300 is fixedly mounted on the second toothed plate 130 and can slide linearly synchronously with the second toothed plate 130. The support arc frame 310 of the support guide 300 adopts an arc-shaped support structure, which fits and supports the pipe fitting 400 to be welded from the bottom. It not only shares the weight of the pipe fitting and avoids the pipe fitting from sagging and deformation, but also provides radial support and sliding guidance for the pipe fitting. Together with the clamping mechanism 200, it constrains the spatial position of the pipe fitting 400 to be welded.

[0028] In this embodiment, the drive platform 100 achieves synchronous reverse linkage between the clamping mechanism 200 and the support guide 300 through the meshing linkage structure of the linkage gear 110, the first toothed plate 120, and the second toothed plate 130. This allows for rapid alignment and precise end-face docking of the pipe fittings 400 to be welded on both sides without the need for separate adjustments, thus improving the efficiency of pipe positioning and splicing. Multiple actions, including pipe support, clamping, and alignment, can be completed simultaneously by the linkage sliding of the first toothed plate 120 and the second toothed plate 130, resulting in high structural freedom and convenient clamping and fixing.

[0029] See appendix Figure 2 -Appendix Figure 3 and attached Figure 8The clamping mechanism 200 also includes: a mounting base 210 disposed on the first toothed plate 120; the mounting base 210 has a through rotating cavity 211, and the rotating base 220 is rotatably disposed in the rotating cavity 211.

[0030] In this embodiment: the mounting base 210 is fixedly mounted on the first toothed plate 120 and can move synchronously with the first toothed plate 120 as a whole, providing a stable mounting base and positioning reference for the entire clamping mechanism 200. A through-type rotating cavity 211 is opened inside the mounting base 210. The rotating cavity 211 provides an annular limiting assembly space for the rotating seat 220, so that the rotating seat 220 can be coaxially limited and assembled inside the rotating cavity 211, limiting the axial movement and radial offset of the rotating seat 220, retaining only the circumferential rotational degree of freedom, ensuring that the rotating seat 220 can smoothly rotate around its own axis within the rotating cavity 211, providing installation support and rotational constraint basis for subsequently driving the circumferential rotation of the pipe fitting 400 to be welded in the clamping cavity 222.

[0031] In this embodiment, the rotating cavity 211 provides all-around limiting support for the rotating seat 220, effectively restricting the axial movement and radial runout of the rotating seat 220 during operation, ensuring high operational stability and preventing eccentric swaying of the pipe fitting 400 to be welded. Through the cooperation between the mounting base 210 and the rotating cavity 211, the rotating seat 220 only has a stable rotation function, providing reliable structural support for the uniform rotation and feeding of the pipe fitting during circumferential welding, and improving the uniformity of the weld formation.

[0032] See appendix Figure 6 -Appendix Figure 8 A limiting groove 212 is provided on the radial inner wall of the rotating cavity 211, and a limiting rail 221 is provided on the radial inner wall of the rotating seat 220; the limiting rail 221 is rotatably disposed in the limiting groove 212. A meshing seat 224 is provided on the axial outer wall of one end of the rotating seat 220; the mounting seat 210 also includes: a rotary motor 213, which is provided on the main body of the mounting seat 210; a drive gear 214 is installed on the output end of the rotary motor 213; and a belt 215 is wound around the drive gear 214 and the meshing seat 224.

[0033] In this embodiment: a limiting groove 212 is provided on the radial inner wall of the rotating cavity 211, and a limiting rail 221 is provided on the radial outer wall of the rotating seat 220. The limiting rail 221 is embedded in the limiting groove 212 and can slide along the circumference of the groove. Through the concave-convex fit structure of the limiting groove 212 and the limiting rail 221, radial limiting, axial positioning and circumferential guiding constraints are formed on the rotating seat 220, which restricts the radial offset and axial movement of the rotating seat 220, and only retains a stable circumferential rotational degree of freedom, so that the rotating seat 220 can rotate smoothly in the rotating cavity 211 with a fixed axis.

[0034] In this embodiment: the rotary motor 213 is fixed on the main body of the mounting base 210 as a power source, and the output end is equipped with the drive gear 214. The outer wall of one end of the rotating base 220 is provided with the meshing seat 224. The belt 215 is wrapped around the drive gear 214 and the meshing seat 224 to form a belt drive structure. The rotary motor 213 drives the drive gear 214 to rotate, and the meshing seat 224 is driven to rotate synchronously through the belt 215, thereby driving the entire rotating base 220 to rotate uniformly around its own axis, and driving the pipe to be welded 400 inside the clamping cavity 222 to rotate in a circle.

[0035] In this embodiment, the limiting groove 212 and the limiting rail 221 fit together, significantly improving the coaxiality of the rotating seat 220 during rotation, effectively suppressing radial runout and axial movement, preventing eccentricity and wobbling of the pipe fitting 400 during rotation, and ensuring the smooth rotation of the pipe fitting. The belt drive has a compact layout and is installed on the outside of the mounting base 210, without occupying the space for pipe fitting clamping and welding operations, which facilitates the overall structural layout and subsequent inspection and maintenance, while also enabling stable torque transmission over long distances.

[0036] See appendix Figure 6 -Appendix Figure 8 A compression cavity 230 is provided on the axial outer wall of the other end of the rotating seat 220; an annular seat 231 is provided between the compression cavity 230 and the clamping cavity 222; The clamping mechanism 200 also includes: a positioning element 240, which is slidably disposed on the annular seat 231; used to lock the radial inner wall of the pipe fitting 400 to be welded.

[0037] In this embodiment: a compression cavity 230 is formed on the outer axial wall of the rotating seat 220 away from the meshing seat 224. An annular seat 231 is fixedly arranged between the compression cavity 230 and the clamping cavity 222. The annular seat 231 serves as an intermediate support base, separating the cavity spaces of the compression cavity 230 and the clamping cavity 222, and simultaneously providing a sliding installation reference and limiting support structure for the positioning member 240. The positioning member 240 is slidably assembled on the annular seat 231 and can perform telescopic sliding movements along the radial direction of the annular seat 231. When the pipe to be welded 400 is placed inside the clamping cavity 222, the positioning member 240 can be pushed out radially from the inner side wall of the pipe to be welded 400, and fit against the radial inner wall of the pipe to be welded 400, thereby achieving centering, tightening and circumferential locking of the pipe to be welded 400 from the inside, forming a two-way constraint with the outer limit of the clamping cavity 222.

[0038] In this embodiment, the extrusion chamber 230 is independently located at the end of the rotating seat 220, providing a dedicated mounting cavity for the subsequent extrusion drive structure. This ensures that the movement of the extrusion chamber does not interfere with the overall structure, resulting in a compact and orderly overall structure. The annular seat 231 serves a dual purpose: isolating the chamber and supporting the positioning member 240. It separates the extrusion chamber 230 from the clamping chamber 222, preventing internal structural interference, and also provides a stable sliding track for the positioning member 240, ensuring precise and non-deviation-prone radial extension and retraction.

[0039] In this embodiment, the positioning element 240 adopts an inner wall clamping locking method, which can be centered and clamped from inside the pipe fitting 400 to be welded. It is adapted to the hollow tubular workpiece structure and can automatically correct the coaxiality of the pipe fitting 400 to be welded, avoiding clamping eccentricity. The internal and external clamping structure improves the stability of the pipe fitting 400 to be welded and effectively prevents the pipe fitting from slipping, loosening, and radial displacement during the rotation welding process driven by the rotating seat 220.

[0040] See appendix Figure 6 -Appendix Figure 8 The annular seat 231 has a telescopic cavity 232; the two ends of the telescopic cavity 232 are respectively connected to the extrusion cavity 230 and the clamping cavity 222; the positioning member 240 is slidably disposed in the telescopic cavity 232, and a positioning arc plate 241 is provided on the side of the positioning member 240 facing the pipe fitting 400 to be welded, and a first arc surface 243 is provided on the side of the positioning member 240 away from the pipe fitting 400 to be welded; The clamping mechanism 200 further includes: a pressing member 251, which is rotatably disposed in the pressing chamber 230; the pressing member 251 includes a second arc surface 252, which is used to abut against the first arc surface 243.

[0041] In this embodiment: a telescopic cavity 232 is provided inside the annular seat 231. The two ends of the telescopic cavity 232 are respectively connected to the extrusion cavity 230 and the clamping cavity 222, which defines the radial linear sliding path of the positioning member 240, so that the positioning member 240 can only make radial telescopic displacement along the telescopic cavity 232.

[0042] The positioning component 240 is assembled inside the telescopic cavity 232. A positioning arc plate 241 is provided on the side facing the pipe fitting 400 to be welded, and a first arc surface 243 is formed on the side facing away from the pipe fitting 400. The extrusion component 251 is rotatably installed inside the extrusion cavity 230, and a second arc surface 252 is provided on the extrusion component 251. When the extrusion component 251 rotates, the second arc surface 252 gradually conforms to and presses against the first arc surface 243. Utilizing the arc surface inclined plane transmission principle, the rotational motion of the extrusion component 251 is converted into the positioning component 240 sliding linearly outward along the radial direction of the telescopic cavity 232, pushing the positioning arc plate 241 against the inner wall of the pipe fitting 400 to be welded, achieving centering and tightening from inside the pipe fitting.

[0043] When the extrusion piece 251 is rotated in the reverse direction, the second arc surface 252 releases the pressure on the first arc surface 243, and the positioning piece 240 can retract and reset, releasing the lock on the pipe fitting 400 to be welded.

[0044] In this embodiment, the telescopic cavity 232 provides precise guidance and limitation for the positioning element 240, constraining it to perform only radial linear movement without offset, ensuring high coaxiality of the centering action. The positioning arc plate 241 adopts an arc-shaped structure, which can fit in close contact with the inner arc surface of the pipe to be welded 400, resulting in uniform force distribution and avoiding damage to the inner wall of the pipe caused by point compression. At the same time, it increases the contact area and enhances clamping stability.

[0045] In this embodiment, the rotational power is smoothly converted into radial clamping force through the arc contact transmission between the first arc surface 243 and the second arc surface 252.

[0046] See appendix Figure 7 -Appendix Figure 8 The extrusion chamber 230 has a reset chamber 233, which is connected to the telescopic chamber 232; The positioning component 240 includes a return spring 242; one end of the return spring 242 is connected to the main body of the positioning component 240, and the other end is connected to the inner wall of the reset cavity 233. The clamping mechanism 200 also includes a clamping motor 250; the output end of the clamping motor 250 is connected to the extruder 251 in a transmission connection.

[0047] In this embodiment: the compression chamber 230 has a reset chamber 233 that communicates with the telescopic chamber 232, providing installation space and a fixing reference for the reset spring 242. One end of the reset spring 242 is connected to the main body of the positioning member 240, and the other end is fixed to the inner wall of the reset chamber 233. Under normal conditions, the reset spring 242 applies an inward elastic preload to the positioning member 240.

[0048] In this embodiment: the clamping motor 250 serves as the power drive source, and its output end forms a transmission connection with the extrusion member 251. When the clamping motor 250 rotates in the forward direction, it drives the extrusion member 251 to rotate. The second arc surface 252 continuously presses the first arc surface 243, overcoming the elastic force of the return spring 242 and pushing the positioning member 240 to slide outward along the telescopic cavity 232, so that the positioning arc plate 241 presses against the inner wall of the pipe fitting 400 to be welded to complete the locking clamping. When the clamping motor 250 rotates in the reverse direction to release the force, the extrusion member 251 releases the pressure constraint on the positioning member 240, the return spring 242 releases its elastic potential energy, and pulls the positioning member 240 to automatically retract and reset along the telescopic cavity 232, disengaging from the inner wall of the pipe fitting 400 to be welded, thereby realizing the rapid unloading of the pipe fitting.

[0049] In this embodiment, the reset cavity 233 and the telescopic cavity 232 are connected and arranged to reasonably accommodate the reset spring 242. The structure has a high degree of integration and does not occupy additional external installation space. At the same time, it limits the deformation direction of the reset spring 242 to prevent the spring from deviating or twisting. The reset spring 242 and the reset cavity 233 form an elastic reset structure, which can realize the automatic retraction of the positioning component 240 without the need for an additional driving mechanism.

[0050] The clamping motor 250 precisely controls the rotation angle and torque of the extrusion piece 251, and can flexibly adjust the clamping stroke and clamping force of the positioning piece 240, adapting to different inner diameter specifications of the pipe fittings 400 to be welded, with strong versatility.

[0051] See appendix Figure 2 -Appendix Figure 3 The drive stage 100 also includes a dual-axis cylinder 140; the output ends of the dual-axis cylinder 140 are respectively connected to the second gear plate 130. The drive table 100 also includes a protective cover 150; the protective cover 150 is used to protect the dual-shaft cylinder 140; the drive table 100 also includes a collection component 160; the collection component 160 is located below the abutment of the pipe fitting 400 to be welded, and is used to collect welding slag. The driver console 100 also includes a control panel 170.

[0052] In this embodiment: the dual-axis cylinder 140 is fixedly mounted on the drive table 100, and its output end is connected to the second toothed plate 130. The extension and retraction action of the dual-axis cylinder 140 outputs linear driving force, which drives the second toothed plate 130 to slide smoothly in a straight line. Then, through the meshing transmission relationship between the linkage gear 110 and the first toothed plate 120 and the second toothed plate 130, the first toothed plate 120 is synchronously driven to make a reverse synchronous displacement, so as to realize the linkage of the clamping mechanism 200 and the support guide 300 to approach or separate, and complete the automatic alignment and splicing and station adjustment of the pipe fitting 400 to be welded.

[0053] In this embodiment, the protective cover 150 is installed outside the dual-axis cylinder 140 to form a closed protective space, which can isolate welding fumes, spatter, processing debris and on-site dust, prevent foreign objects from entering the piston rod and cylinder body mating parts of the dual-axis cylinder 140, and prevent jamming, corrosion and wear of seals.

[0054] In this embodiment, the collecting component 160 is arranged directly below the butt welding position of the pipe fitting 400 to be welded. Utilizing its own receiving cavity structure, it can collect the high-temperature welding slag, molten droplets, and welding waste that fall during the welding operation in real time, thereby achieving centralized collection of welding slag.

[0055] In this embodiment, the control panel 170 integrates control buttons and adjustment modules for equipment start / stop, cylinder extension / retraction, motor speed, clamping and locking, etc., and serves as the central control hub for the entire machine. It centrally issues control commands and uniformly regulates the operating status and working parameters of the actuators such as the dual-axis cylinder 140, rotary motor 213, and clamping motor 250.

[0056] See appendix Figure 2 -Appendix Figure 4 A rubber pad 223 is provided on the radial inner wall of the clamping cavity 222; an anti-slip groove is provided on the outer wall of the positioning arc plate 241; A linkage groove 111 is provided on the drive platform 100; a linkage gear 110 is rotatably disposed in the linkage groove 111; a first sliding groove 121 and a second sliding groove 131 are provided on the drive platform 100; the first sliding groove 121 and the second sliding groove 131 are respectively located on both sides of the linkage groove 111; the first sliding groove 121 and the second sliding groove 131 are respectively connected to the linkage groove 111; a first toothed plate 120 is slidably disposed in the first sliding groove 121, and a second toothed plate 130 is slidably disposed in the second sliding groove 131.

[0057] In this embodiment: rubber pads 223 are arranged on the radial inner wall of the clamping cavity 222. After the pipe fitting 400 to be welded is inserted into the clamping cavity 222, it flexibly contacts the rubber pads 223, relying on the elasticity of the rubber material itself to generate buffering damping and static friction. Anti-slip grooves are opened on the outer wall of the positioning arc plate 241 to increase the contact friction coefficient with the inner wall of the pipe fitting 400 to be welded, forming a double anti-slip constraint with the outer wall rubber pads 223 and the inner wall positioning arc plate 241 with anti-slip grooves.

[0058] In this embodiment: the drive platform 100 has a linkage groove 111 to provide a fixed rotating mounting cavity for the linkage gear 110, defining the mounting position and rotation center of the linkage gear 110. The drive platform 100 has a first sliding groove 121 and a second sliding groove 131 on both sides of the linkage groove 111, and both sliding grooves are connected to the linkage groove 111, defining the linear sliding trajectory for the first toothed plate 120 and the second toothed plate 130 respectively. The first toothed plate 120 slides along the first sliding groove 121 and the second toothed plate 130 slides along the second sliding groove 131 in a directional linear motion, ensuring that the two toothed plates always maintain a precise meshing state with the linkage gear 110, and realizing smooth synchronous reverse transmission.

[0059] In this embodiment, the rubber pad 223 has elastic buffering, anti-slip and wear-resistant properties. It can increase the clamping friction between the clamping cavity 222 and the outer wall of the pipe to be welded 400, prevent the pipe from slipping circumferentially during rotational welding, avoid rigid clamping from scratching the outer wall of the pipe, and buffer welding vibration to reduce the vibration transmission amplitude.

[0060] The anti-slip groove on the outer wall of the positioning arc plate 241 can increase the interlocking friction with the inner wall of the pipe fitting 400 to be welded. Together with the outer rubber pad 223, it forms a two-way anti-slip locking structure, which makes the clamping more secure. There is no relative slippage during the rotation of the pipe fitting, ensuring the uniformity of the circumferential weld.

[0061] In this embodiment, the first slide groove 121 and the second slide groove 131 respectively guide the first tooth plate 120 and the second tooth plate 130 to slide and limit the radial movement, so as to avoid the tooth plate from deviating when sliding, and always maintain the good meshing between the tooth plate and the linkage gear 110, so that the transmission is smooth and without jamming.

[0062] See appendix Figure 9 -Appendix Figure 10 The support arc frame 310 has a groove 311 on the inner wall facing the pipe fitting 400 to be welded; a ball bearing 312 is rotatably arranged in the groove 311; the pipe fitting 400 to be welded abuts against the ball bearing 312.

[0063] In this embodiment, the support arc frame 310 has a groove 311 on the inner sidewall facing the pipe fitting 400 to be welded. The groove 311 provides an embedded installation space for the ball bearing 312, and the ball bearing 312 is rotatably and limitedly arranged inside the groove 311. When the pipe fitting 400 to be welded is placed on the support arc frame 310, the outer wall of the pipe fitting directly rolls against the surface of the ball bearing 312, so that the friction between the pipe fitting 400 to be welded and the support arc frame 310 changes from sliding friction to rolling friction. When the rotating seat 220 drives the pipe fitting 400 to be welded to perform circumferential rotary welding, the ball bearing 312 rotates freely synchronously with the pipe fitting, providing bottom support for the pipe fitting without hindering the circumferential rotation of the pipe fitting.

[0064] In this embodiment, the groove 311 provides a limiting constraint on the ball bearing 312, preventing it from falling off or shifting, and ensuring a stable and reliable installation position. The ball bearing 312 employs a rolling support structure, significantly reducing frictional resistance during the rotation of the pipe fitting 400, resulting in smooth and effortless rotation. Multi-point ball bearing support ensures uniform force distribution on the pipe fitting 400, preventing large-area hard contact between the support arc frame 310 and the pipe fitting, thus avoiding wear and scratches on the pipe wall and effectively protecting the outer surface of the pipe fitting.

[0065] See appendix Figure 1 -Appendix Figure 10 A workpiece positioning method for a conveniently fixed welding fixture includes: installing two pipe fittings 400 to be welded on the support arc frames 310 on both sides respectively; sliding the pipe fittings 400 to be welded toward the clamping cavity 222 and clamping the pipe fittings 400 to be welded; driving the second toothed plate 130 to slide relative to each other; the clamping mechanisms 200 on both sides move closer to the center, and the support arc frames 310 on both sides slide outwards and approach the clamping mechanism 200; the pipe fittings 400 to be welded on both sides abut against each other.

[0066] In this embodiment: First, two pipe fittings 400 to be welded are placed on the left and right supporting arc frames 310 respectively. The supporting arc frames 310 and the built-in ball bearings 312 provide support and rolling support for the bottom of the pipe fittings, completing the initial positioning of the pipe fittings. Then, the pipe fittings 400 to be welded are pushed axially into the clamping cavity 222, so that the end of the pipe fitting enters the clamping cavity 222. Then, the positioning member 240 of the clamping mechanism 200 presses against the inner wall of the pipe fitting and is limited by the outer wall of the rubber pad 223 on the inner wall of the clamping cavity 222, realizing the bidirectional centering and clamping fixation of the pipe fittings 400 to be welded. Next, the second toothed plate 130 is driven to slide linearly. Under the meshing transmission of the linkage gear 110, the first toothed plate 120 is driven to slide synchronously in the opposite direction. The two clamping mechanisms 200 fixed on the first toothed plate 120 move towards the center of the tooling simultaneously, and the two supporting arc frames 310 fixed on the second toothed plate 130 slide outwards and move closer to the clamping mechanism 200, so that the end faces of the pipe fittings 400 to be welded are precisely fitted and abutted, completing the automatic centering, rapid positioning and splicing of the pipe fittings.

[0067] First, the support is placed, then the material is axially fed and clamped. The support arc frame 310 pre-supports the weight of the pipe fitting, preventing it from drooping and reducing alignment deviation. The internal and external clamping method can automatically correct the coaxiality of the pipe fitting 400 to be welded, ensuring a stable and non-slip clamping, and providing a reliable positioning basis for subsequent circumferential rotational welding.

[0068] By leveraging the reverse linkage characteristics of the linkage gear 110, the first toothed plate 120, and the second toothed plate 130, a single drive can simultaneously achieve the centering and closing of the clamping mechanism 200 and the adaptive adjustment of the support arc frame 310, avoiding interference from the support arc frame 310 during welding operations, resulting in a high degree of automation.

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and inventive features disclosed herein.

Claims

1. A workpiece positioning method, characterized in that: S100. Two pipe fittings (400) to be welded are respectively installed on the support arc frames (310) on both sides of the drive table (100); wherein, the drive table (100) includes a linkage mechanism; the linkage mechanism includes a linkage gear (110), and a first toothed plate (120) and a second toothed plate (130) that are slidably arranged; the linkage gear (110) meshes with the first toothed plate (120) and the second toothed plate (130) respectively; the second toothed plate (130) is provided with a support guide (300); the support guide (300) includes the support arc frame (310). S200. The pipe fitting (400) to be welded is slid toward the clamping cavity (222) and clamped by the clamping mechanism (200); the clamping mechanism (200) is disposed on the first toothed plate (120); including a rotating seat (220) which is rotatably disposed, the axial inner wall of the rotating seat (220) is provided with a clamping cavity (222), and the pipe fitting (400) to be welded is disposed in the clamping cavity (222); a squeezing cavity (230) is provided on the axial outer wall of the other end of the rotating seat (220); an annular seat (231) is provided between the squeezing cavity (230) and the clamping cavity (222); the annular seat (231) is provided with a telescopic cavity (232); the two ends of the telescopic cavity (232) are respectively connected to the squeezing cavity (230) and the clamping cavity (222); S300. Drive the second toothed plate (130) to slide relative to each other; S400. The clamping mechanisms (200) on both sides move closer to the center, and the support arc frames (310) on both sides slide outwards and approach the clamping mechanisms (200). S500. The two pipe fittings to be welded (400) abut against each other; through the gear tooth plate linkage transmission structure, the clamping part and the supporting part can be moved in opposite directions synchronously and in one go, which can complete the automatic centering, rapid positioning and end face splicing of the two pipe fittings to be welded at one time.

2. The workpiece positioning method according to claim 1, characterized in that, The clamping mechanism (200) further includes: Mounting base (210) is disposed on the first toothed plate (120); the mounting base (210) has a through rotating cavity (211), and the rotating base (220) is rotatably disposed in the rotating cavity (211).

3. The workpiece positioning method according to claim 2, characterized in that, A limiting groove (212) is provided on the radial inner wall of the rotating cavity (211), and a limiting rail (221) is provided on the radial inner wall of the rotating seat (220); the limiting rail (221) is rotatably disposed in the limiting groove (212). A meshing seat (224) is provided on the axial outer wall of one end of the rotating seat (220). The mounting base (210) further includes: a rotary motor (213) disposed on the main body of the mounting base (210); a drive gear (214) is mounted on the output end of the rotary motor (213); and a belt (215) is wound around the drive gear (214) and the meshing seat (224).

4. The workpiece positioning method according to claim 3, characterized in that, The clamping mechanism (200) further includes: The positioning element (240) is slidably disposed on the annular seat (231); used to lock the radial inner wall of the pipe fitting (400) to be welded.

5. The workpiece positioning method according to claim 4, characterized in that, The positioning element (240) is slidably disposed in the telescopic cavity (232). The positioning element (240) has a positioning arc plate (241) on the side facing the pipe fitting (400) to be welded, and a first arc surface (243) on the side of the positioning element (240) away from the pipe fitting (400) to be welded. The clamping mechanism (200) further includes: An extrusion member (251) is rotatably disposed in the extrusion chamber (230); the extrusion member (251) includes a second arc surface (252), which is used to abut against the first arc surface (243).

6. The workpiece positioning method according to claim 5, characterized in that, The extrusion chamber (230) has a reset chamber (233), which is connected to the telescopic chamber (232); The positioning element (240) includes a return spring (242); one end of the return spring (242) is connected to the main body of the positioning element (240), and the other end is connected to the inner wall of the reset cavity (233); And / or, the clamping mechanism (200) further includes a clamping motor (250); the output end of the clamping motor (250) is connected to the extruder (251) in a transmission connection.

7. A workpiece positioning method according to any one of claims 1-5, characterized in that, The drive platform (100) also includes a dual-axis cylinder (140); the output ends of the dual-axis cylinder (140) are respectively connected to the second toothed plate (130); And / or, the drive stage (100) further includes a protective cover (150); the protective cover (150) is used to protect the biaxial cylinder (140); And / or, the drive table (100) further includes a collection member (160); the collection member (160) is disposed below the abutment of the pipe fitting (400) to be welded, for collecting welding slag; And / or, the drive station (100) also includes a control panel (170).

8. A workpiece positioning method according to any one of claims 1-5, characterized in that, A rubber pad (223) is provided on the radial inner wall of the clamping cavity (222); an anti-slip groove is provided on the outer wall of the positioning arc plate (241); And / or, the drive platform (100) is provided with a linkage groove (111); the linkage gear (110) is rotatably disposed in the linkage groove (111). The drive platform (100) is provided with a first slide groove (121) and a second slide groove (131); the first slide groove (121) and the second slide groove (131) are respectively located on both sides of the linkage groove (111); the first slide groove (121) and the second slide groove (131) are respectively connected to the linkage groove (111); the first toothed plate (120) is slidably disposed in the first slide groove (121), and the second toothed plate (130) is slidably disposed in the second slide groove (131).

9. A workpiece positioning method according to any one of claims 1-5, characterized in that, The support arc frame (310) has a groove (311) on its inner wall facing the pipe fitting (400) to be welded; a ball bearing (312) is rotatably disposed in the groove (311). The pipe fitting to be welded (400) abuts against the ball (312).

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