Female threaded water pipe welding tool

Abstract

The utility model belongs to welding frock technical field discloses a kind of inner thread water pipe welding frock, including module combination base, positioning device and cylinder driving system;Module combination base is composed of height module and first mounting plate, and height module is fixedly installed on first mounting plate;Cylinder driving system includes cylinder and second mounting plate, and cylinder is fixedly installed on the reverse of second mounting plate;Positioning device includes positioning protection, copper conductive positioning and positioning column, and positioning column is fixedly installed on the front of second mounting plate;The utility model uses the pad block or screw adjusting mechanism of stackable, realizes fine adjustment precision, so that frock can flexibly adapt to the welding demand of different height, positioning protection adopts the arc structure made of high-temperature-resistant insulating material, and accurately adapts with workpiece surface, accurately presses workpiece under cylinder driving, effectively prevents the damage of welding splashing to inner thread, protects the integrity of inner thread, avoids welding defect caused by splashing.

Description

Technical Field

[0001] This utility model relates to the field of welding tooling technology, and in particular to a welding tooling for internally threaded water pipes. Background Technology

[0002] In industrial production, welding internally threaded water pipes is a common but technically demanding process. Traditional methods for welding internally threaded water pipes mainly rely on manual operation, which presents numerous technical challenges. Existing welding fixtures are mostly fixed structures, unable to be height-adjusted according to actual welding needs, leading to inaccurate welding positions and affecting weld quality. During the welding process, due to the special structure of internal threads, welding spatter easily adheres to the surface of the internal threads, causing damage and affecting subsequent assembly and performance.

[0003] Furthermore, traditional welding fixtures lack an effective current conduction system, leading to unstable welding arcs and a tendency to produce welding defects such as porosity and slag inclusions. Existing positioning devices are mostly simple planar structures, unable to properly conform to the curved surface of internally threaded water pipes, resulting in inaccurate positioning and easy workpiece displacement during welding, affecting weld quality. Simultaneously, the lack of guiding components in the design results in poor centering accuracy during mold closing, further reducing the consistency and reliability of the weld. Utility Model Content

[0004] The main objective of this invention is to provide a welding fixture for internally threaded water pipes, aiming to solve the problem that traditional welding fixtures lack an effective current conduction system, leading to unstable welding arcs and easy generation of welding defects such as porosity and slag inclusions. Existing positioning devices are mostly simple planar structures, which cannot fit well with the curved surface of the internally threaded water pipe, resulting in inaccurate positioning.

[0005] To achieve the above-mentioned utility model objectives, the first aspect of this utility model proposes a welding fixture for internally threaded water pipes, comprising: a modular assembly base, a positioning device, and a cylinder drive system; The modular assembly base consists of a height module and a first mounting plate, wherein the height module is fixedly mounted on the first mounting plate; The cylinder drive system includes a cylinder and a second mounting plate, wherein the cylinder is fixedly mounted on the reverse side of the second mounting plate; The positioning device includes a positioning guard, a copper conductive positioning element, and a positioning post. The positioning post is fixedly installed on the front side of the second mounting plate. The copper conductive positioning element is detachably installed into the positioning post. The positioning guard is connected to the end of the piston rod of the cylinder. The positioning device is arranged relative to the cylinder and the module assembly base, together forming a positioning fixture for welding internally threaded water pipes on an arc surface.

[0006] Furthermore, the positioning protection is made of high-temperature resistant insulating material and has an arc-shaped structure that adapts to the surface of the workpiece.

[0007] Furthermore, the copper conductive positioning device is made of a highly conductive copper alloy, with its outer surface having an interference fit with the positioning post and its inner surface having a threaded structure that matches the internal threaded water pipe.

[0008] Furthermore, the positioning post has a cylindrical structure with its axis perpendicular to the mounting surface of the second mounting plate, and the positioning post has stepped holes inside for accommodating and fixing the copper conductive positioning.

[0009] Furthermore, both the second mounting plate and the first mounting plate are made of metal, and the second mounting plate is fixedly connected to the cylinder body of the cylinder by bolts or welding, while the first mounting plate is adjustablely connected to the height module by bolts.

[0010] Furthermore, the cylinder is a two-way acting cylinder or a single-way acting cylinder to control the downward pressure and displacement accuracy of the positioning protection.

[0011] Furthermore, the height module includes multiple stackable pads or screw adjustment mechanisms, which can be used to adjust the overall height of the module assembly foundation by changing or adjusting the thickness of the pads or the length of the screws.

[0012] Furthermore, the tooling also includes a guide assembly, which includes a guide sleeve disposed on the second mounting plate and a guide post disposed on the module assembly base.

[0013] Furthermore, the copper conductive positioning element is electrically connected to an external welding power source to form a current loop during the welding process.

[0014] Furthermore, a through hole is provided on the surface of the first mounting plate.

[0015] Beneficial effects: 1. This utility model's internal thread water pipe welding fixture, through a height module design in its modular combination foundation, employs stackable pads or screw adjustment mechanisms to achieve fine-tuning precision. This allows the fixture to flexibly adapt to welding requirements at different heights, improving its versatility and adaptability. Secondly, the positioning protection utilizes an arc-shaped structure made of high-temperature resistant insulating material, precisely fitting the workpiece surface. Under cylinder drive, it accurately presses down on the workpiece, effectively preventing welding spatter from damaging the internal thread, protecting the integrity of the internal thread, and avoiding welding defects caused by spatter.

[0016] 2. This utility model's internal thread water pipe welding fixture, made of a highly conductive copper alloy, utilizes a copper conductive positioning system. The threaded structure on its inner surface precisely matches the internal thread of the water pipe, providing not only a reference positioning but also forming a stable current loop through electrical connection with an external welding power source. This significantly improves arc stability and reduces welding defects. The stepped hole design of the positioning post ensures secure installation of the copper conductive positioning system, preventing loosening during welding and improving welding stability.

[0017] 3. The welding fixture for internally threaded water pipes of this utility model features a precisely matched guide component that ensures high alignment accuracy between the positioning device and the modular assembly during mold closing, avoiding welding quality problems caused by alignment deviations and improving the welding success rate. Sixth, the bidirectional design of the cylinder enables precise control of the pressure and displacement accuracy under positioning protection, ensuring the stability and consistency of the welding process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a welding fixture for internally threaded water pipes according to an embodiment of this utility model; Figure 2 This is a top view schematic diagram of the second mounting plate of the internal thread water pipe welding fixture according to an embodiment of this utility model.

[0019] in: 1-Positioning protection; 2-Copper conductive positioning; 3-Positioning post; 4-Second mounting plate; 5-Cylinder; 6-First mounting plate; 61-Through hole; 7-Height module.

[0020] The realization of the purpose of this utility model—its functional features and advantages—will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] Reference Figures 1-2 An embodiment of this utility model provides a welding fixture for internally threaded water pipes, including: a modular assembly base, a positioning device, and a cylinder drive system; The modular assembly base consists of a height module 7 and a first mounting plate 6, wherein the height module 7 is fixedly mounted on the first mounting plate 6; The cylinder drive system includes a cylinder 5 and a second mounting plate 4, wherein the cylinder 5 is fixedly mounted on the reverse side of the second mounting plate 4; The positioning device includes a positioning guard 1, a copper conductive positioning 2, and a positioning post 3. The positioning post 3 is fixedly installed on the front side of the second mounting plate 4. The copper conductive positioning 2 is detachably installed into the positioning post 3. The positioning guard 1 is connected to the end of the piston rod of the cylinder 5. The positioning device is set opposite to the module assembly base via cylinder 5, together forming a positioning fixture for welding internally threaded water pipes on an arc surface.

[0026] In this embodiment, the height module 7 includes multiple stackable stainless steel blocks, each with a thickness of 1mm, 2mm, 5mm, and 10mm. By stacking blocks of different thicknesses, a fine-tuning accuracy of 0.5mm can be achieved. The first mounting plate 6 is made of 10mm thick stainless steel plate, and a through hole 61 with a diameter of 15mm is provided on its surface for installing other auxiliary tools or fixing workpieces.

[0027] Cylinder 5 is a double-acting cylinder, and the downward pressure can be controlled within the range of 0.5-5MPa by adjusting the air pressure. Cylinder 5 is fixedly installed on the reverse side of the second mounting plate 4, which is made of 8mm thick aluminum alloy plate and is firmly connected to the cylinder body of cylinder 5 by bolts.

[0028] The positioning post 3 is a cylindrical structure with a diameter of 20mm. Its axis is perpendicular to the mounting surface of the second mounting plate 4. It has a stepped hole inside, divided into two sections, for accommodating and fixing the copper conductive positioning post 2. The copper conductive positioning post 2 is made of T2 copper alloy, and its outer surface is interference-fitted with the stepped hole of the positioning post 3. The positioning protection 1 is made of polytetrafluoroethylene and has an arc-shaped structure adapted to the workpiece surface. Its radius of curvature matches the outer diameter of the internally threaded water pipe, ensuring that the positioning protection 1 can tightly fit the outer surface of the internally threaded water pipe.

[0029] By combining a modular base, a positioning device, and a cylinder drive system, precise positioning and welding of internally threaded water pipes on an arc surface are achieved, improving welding quality and efficiency. The positioning device, with cylinder 5 positioned relative to the modular base, forms a stable positioning structure, ensuring the internally threaded water pipe remains in place during welding and avoiding welding defects caused by displacement. This method is suitable for efficient and high-quality welding of internally threaded water pipes.

[0030] Optionally, the positioning protection 1 is made of high-temperature resistant insulating material and has an arc-shaped structure that adapts to the surface of the workpiece.

[0031] It should be noted that the arc-shaped structure of the positioning guard 1 is adapted to the workpiece surface, ensuring positioning accuracy and preventing workpiece displacement during the welding process. The selection of high-temperature resistant insulating material effectively prevents welding spatter from damaging the internal threads, protects the integrity of the internal threads, improves welding quality, and avoids welding defects caused by spatter.

[0032] Optionally, the copper conductive positioning 2 is made of a highly conductive copper alloy, with its outer surface having an interference fit with the positioning post 3, and its inner surface having a threaded structure that matches the internal threaded water pipe.

[0033] It should be noted that the high conductivity of the copper conductive positioning element 2 ensures efficient conduction of welding current, thus improving welding quality. The threaded structure on the inner surface matches the internal thread of the water pipe, providing precise reference positioning, ensuring the accuracy of the welding position, and avoiding welding quality problems caused by positioning deviations.

[0034] Optionally, the positioning post 3 is a cylindrical structure with its axis perpendicular to the mounting surface of the second mounting plate 4, and the positioning post 3 has stepped holes inside for accommodating and fixing the copper conductive positioning 2.

[0035] It should be noted that the cylindrical structure and vertical axis of the positioning post 3 ensure the perpendicularity of the positioning and improve the positioning accuracy. The stepped hole design makes the copper conductive positioning 2 firmly installed, avoiding loosening caused by vibration during the welding process, ensuring the stability of the welding, and improving the reliability and consistency of the welding.

[0036] Optionally, both the second mounting plate 4 and the first mounting plate 6 are made of metal, and the second mounting plate 4 is fixedly connected to the cylinder body of the cylinder 5 by bolts or welding, while the first mounting plate 6 is adjustablely connected to the height module 7 by bolts.

[0037] It should be noted that the use of metal materials ensures the structural strength and durability of the tooling, thus extending its service life. The robust connection between the second mounting plate 4 and the cylinder 5 guarantees the stability of the cylinder 5's drive. The adjustable connection design between the first mounting plate 6 and the height module 7 allows for flexible adjustment of the tooling height, adapting to different welding requirements and improving the tooling's versatility and adaptability.

[0038] Optionally, the cylinder 5 is a two-way acting cylinder or a single-way acting cylinder to control the downward pressure and displacement accuracy of the positioning protection 1.

[0039] It should be noted that the bidirectional design of cylinder 5 provides precise control over the downward pressure and displacement accuracy of positioning protection 1, ensuring the stability of the welding process. The high-precision control of cylinder 5 avoids welding defects caused by excessive or insufficient downward pressure, improves welding quality, and simultaneously achieves automated control of the welding process, thereby increasing production efficiency.

[0040] Optionally, the height module 7 includes multiple stackable pads or screw adjustment mechanisms, which can be used to adjust the overall height of the module assembly foundation by changing or adjusting the thickness of the pads or the length of the screws.

[0041] It should be noted that the adjustable design of height module 7 allows the tooling to adapt to welding requirements at different heights, improving the tooling's versatility. Precise fine-tuning ensures accurate matching between the welding tooling and the workpiece, improving welding quality while reducing welding defects caused by height mismatches and enhancing welding consistency.

[0042] Optionally, the tooling further includes a guide assembly, which includes a guide sleeve disposed on the second mounting plate 4 and a guide post disposed on the module assembly base.

[0043] It should be noted that the design of the guide assembly ensures the alignment accuracy of the positioning device and the modular assembly base during mold closing, avoiding welding quality problems caused by alignment deviations. The precise fit between the guide sleeve and the guide post improves the stability and reliability of the tooling, reduces welding failures caused by alignment issues, and increases the welding success rate.

[0044] Optionally, the copper conductive positioning 2 is electrically connected to an external welding power source to form a current loop during the welding process.

[0045] It should be noted that the copper conductive positioning element 2 is electrically connected to the external welding power source, forming a stable current loop, which improves the stability of the arc and reduces welding spatter and arc instability. High conductivity ensures efficient current transmission, improving welding quality and efficiency while reducing energy loss during the welding process.

[0046] Optionally, a through hole 61 is provided on the surface of the first mounting plate 6.

[0047] It should be noted that the design of the through hole 61 facilitates the installation and debugging of the tooling and improves the versatility of the tooling.

[0048] Instructions: First, adjust the height module 7 according to welding requirements. A fine-tuning accuracy of 0.5mm is achieved by stacking stainless steel pads of different thicknesses (1mm, 2mm, 5mm, 10mm), ensuring the overall height of the fixture adapts to the welding surface. Second, insert the copper conductive positioning locator 2 into the stepped hole of the positioning post 3, ensuring an interference fit and firmly fixing the copper conductive positioning locator 2 within the positioning post 3. Next, place the internally threaded water pipe to be welded onto the threaded structure of the copper conductive positioning locator 2, ensuring a precise match between the internal thread and the threaded structure of the copper conductive positioning locator 2. Then, activate cylinder 5, using a two-way action cylinder 5 to control the piston rod, driving the positioning protection 1 downwards. The positioning protection 1 is made of polytetrafluoroethylene (PTFE). The arc-shaped structure made of ethylene fits tightly against the outer surface of the internally threaded water pipe, achieving precise positioning and preventing welding spatter from damaging the internal threads. After the positioning protection 1 is pressed into place, the copper conductive positioning 2 is connected to the external welding power source to form a stable current circuit, and the welding operation begins. The precise control of the cylinder 5 ensures that the downward pressure is within the range of 0.5-5MPa, guaranteeing the welding quality. During the welding process, the guide component ensures the alignment accuracy of the positioning device and the module assembly base when the mold is closed, avoiding welding misalignment. After the welding is completed, the cylinder 5 is stopped, the positioning protection 1 is lifted, the welded internally threaded water pipe is removed, and the welding quality is checked to ensure that the internal threads are undamaged and the weld is free of defects, thus completing the entire welding process.

[0049] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A welding fixture for internally threaded water pipes, characterized in that, include: Modular assembly base, positioning device and cylinder drive system; The modular assembly base consists of a height module (7) and a first mounting plate (6), wherein the height module (7) is fixedly mounted on the first mounting plate (6); The cylinder drive system includes a cylinder (5) and a second mounting plate (4), wherein the cylinder (5) is fixedly mounted on the reverse side of the second mounting plate (4); The positioning device includes a positioning guard (1), a copper conductive positioning (2) and a positioning post (3). The positioning post (3) is fixedly installed on the front of the second mounting plate (4). The copper conductive positioning (2) is detachably installed into the positioning post (3). The positioning guard (1) is connected to the end of the piston rod of the cylinder (5). The positioning device is set relative to the module assembly base via a cylinder (5), together forming a positioning fixture for welding internally threaded water pipes on an arc surface.

2. The welding fixture for internally threaded water pipes according to claim 1, characterized in that, The positioning protection (1) is made of high temperature resistant insulating material and is an arc-shaped structure that adapts the positioning protection (1) to the surface of the workpiece.

3. The welding fixture for internally threaded water pipes according to claim 1, characterized in that, The copper conductive positioning (2) is made of a highly conductive copper alloy. Its outer surface is interference-fitted with the positioning post (3), and its inner surface is provided with a thread structure that matches the internal thread water pipe.

4. The welding fixture for internally threaded water pipes according to claim 1, characterized in that, The positioning post (3) is a cylindrical structure with its axis perpendicular to the mounting surface of the second mounting plate (4). The positioning post (3) has stepped holes inside for accommodating and fixing the copper conductive positioning (2).

5. The welding fixture for internally threaded water pipes according to claim 1, characterized in that, Both the second mounting plate (4) and the first mounting plate (6) are made of metal. The second mounting plate (4) is fixedly connected to the cylinder body of the cylinder (5) by bolts or welding, and the first mounting plate (6) is adjustablely connected to the height module (7) by bolts.

6. The welding fixture for internally threaded water pipes according to claim 1, characterized in that, The cylinder (5) is a two-way acting cylinder or a single-way acting cylinder to control the downward pressure and displacement accuracy of the positioning protection (1).

7. The welding fixture for internally threaded water pipes according to claim 1, characterized in that, The height module (7) includes multiple stackable pads or screw adjustment mechanisms, which can adjust the overall height of the module assembly foundation by changing or adjusting the thickness of the pads or the length of the screws.

8. The female pipe welding fixture of claim 1, wherein, The tooling also includes a guide assembly, which includes a guide sleeve on the second mounting plate (4) and a guide post on the module assembly base.

9. The welding fixture for internally threaded water pipes according to claim 1, characterized in that, The copper conductive positioning (2) is electrically connected to an external welding power source to form a current loop during the welding process.

10. The welding fixture for internally threaded water pipes according to claim 1, characterized in that, The first mounting plate (6) has a through hole (61) on its surface.

Images