A positioning and welding device and a positioning and welding method for welding a blowdown tee valve

Abstract

The present application provides a kind of positioning welding device and positioning welding method for sewage tee bend valve welding, it is related to positioning welding device technical field, the positioning welding device of the present application integrates in the side pipe clamping mechanism, it can complete the alignment of welding torch and weld in the positioning process of side pipe, while welding torch drive mechanism can be realized the driving control of the three-dimensional trajectory of welding torch space only by the rotation driving of rotating ring sleeve, so as to reduce the control difficulty of welding torch drive mechanism, improve welding precision, reduce the cost of welding device.The side pipe clamping mechanism of the present application can adapt to the side pipe of different pipe diameter within a certain range;And welding torch can be adjusted the distance of welding torch relative to the axis of connecting sleeve by telescopic rod assembly, it can adapt to the welding of tee bend valve shell part of different pipe diameter, strong universality, and can achieve the effect of reducing welding thermal deformation and reducing welding stress, thereby improving tee bend valve shell part welding precision and welding strength.

Description

Technical Field

[0001] This invention relates to the field of positioning welding device technology, specifically to a positioning welding device and method for welding a sewage three-way valve. Background Technology

[0002] Three-way valves are commonly used in equipment drainage systems. They have functions such as shut-off, regulation, flow diversion, backflow prevention, pressure stabilization, flow splitting, and overflow. A three-way valve consists of a valve body and a control valve core. The valve body has three ports arranged in a T-shape, and the control valve core adjusts the connection between these three ports. The valve body is typically manufactured by welding the main pipe and side plates. During welding, a lower welding port is first cut in the middle of the main pipe, and then a corresponding upper welding port is cut at the end (lower end) of the side pipe. The upper and lower welding ports are then aligned and welded together using a welding torch.

[0003] Chinese Patent Application No. CN202411315342.2 discloses a positioning device and method for welding three-way valves. The device includes a worktable, mounting block one and mounting block two, and feeding hoppers one and two fixedly connected to the upper end of the worktable. A discharge hole is provided on the worktable, with feeding hoppers one and two located on either side of the discharge hole, respectively for supplying the side pipeline and the main pipeline. A rotating hook block is rotatably connected to mounting block one, and a placement groove is provided on the rotating hook block. Both mounting block one and the rotating hook block are located below feeding hopper two. A positioning shaft is movably connected to mounting block two, and a push block is fixedly connected to one end of mounting block two near the rotating hook block. This device can realize the stopping, loading, positioning, and unloading of three-way valve welded parts, with a high degree of automation and high positioning accuracy of the three-way valve, thereby improving the welding efficiency of three-way valves.

[0004] Existing three-way valve welding equipment typically employs a separate structure for its welding torch drive mechanism and positioning clamping device. During operation, the positioning clamping device first presses the upper welding port of the side pipe onto the lower welding port of the main pipe to achieve positioning alignment between the upper and lower welding ports. Then, the welding torch drive mechanism (e.g., a robotic arm) clamps the welding torch to perform welding at the weld joint. Because the welding trajectory after aligning the upper and lower weld joints is a three-dimensional arc, its trajectory is complex. The welding torch drive mechanism requires multi-dimensional motion control during welding, which is difficult to control and prone to welding errors. Furthermore, errors are also easily generated during the cutting of the upper and lower weld joints. During the positioning and alignment process using the upper and lower weld joints, large positioning errors can easily occur, thereby reducing the welding accuracy of the three-way valve body. In addition, the main pipe and side pipe used to manufacture the three-way valve body are usually steel pipes, which have limited thermal conductivity. The welding heat cannot be conducted quickly. During the welding process, the high temperature during welding will cause the steel pipe to expand locally, and after welding and cooling, uneven contraction will occur. This will lead to high welding stress and welding thermal deformation problems, affecting the welding accuracy and welding strength of the three-way valve body. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, the present invention aims to provide a positioning welding device and method for welding three-way valves. The positioning welding device of the present invention integrates the welding torch into a side pipe clamping mechanism, which can align the welding torch and the weld seam during the positioning process of the side pipe. Simultaneously, the welding torch drive mechanism can achieve three-dimensional spatial trajectory control of the welding torch simply by rotating the rotating ring sleeve. This reduces the control difficulty of the welding torch drive mechanism, improves welding accuracy, and reduces the cost of the welding device. The side pipe clamping mechanism of the present invention can adapt to side pipes of different diameters within a certain range; and the distance between the welding torch and the axis of the connecting sleeve can be adjusted via a telescopic rod assembly, making it adaptable to welding the body portion of three-way valves of different diameters, thus exhibiting strong versatility. The side tube clamping mechanism of this invention can significantly improve the thermal conductivity of the side tube to be welded, ensuring that the heat generated during welding can be rapidly diffused along the entire heat-conducting ring, reducing the temperature gradient in local high-temperature areas. This reduces thermal stress and shrinkage stress in the three-way valve housing, thereby reducing welding thermal deformation and internal welding stress, and ultimately improving the welding accuracy and strength of the three-way valve housing. This invention can also compensate for cutting errors at the upper and lower weld joints of the main pipe and side tube by utilizing the welding gap width and weld width, further improving the welding accuracy of the three-way valve housing.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a positioning welding device for welding a sewage discharge three-way valve, comprising a fixed base, a lifting drive mechanism, a main pipe clamping mechanism and a side pipe clamping mechanism;

[0007] The main pipe clamping mechanism is set on the fixed base, and the main pipe to be welded is positioned and clamped on the main pipe clamping mechanism; the main pipe to be welded is provided with a lower welding notch.

[0008] The lifting drive mechanism is fixedly mounted on the fixed base, and a connecting sleeve is provided at the lower part of the lifting drive mechanism;

[0009] The welding torch drive mechanism includes a rotating ring sleeve, a ring sleeve drive component, and a limiting sleeve. The rotating ring sleeve is rotatably mounted on the connecting sleeve, and the ring sleeve drive component is fixed on the connecting sleeve. The ring sleeve drive component is used to drive the rotating ring sleeve to rotate on the connecting sleeve.

[0010] The rotating ring sleeve is connected to a lifting sleeve body, and the welding torch is mounted in the lifting sleeve body in a height-adjustable manner.

[0011] The limiting sleeve is provided with a lifting limiting groove, and the side wall of the welding torch is also provided with a fixed lifting drive rod, the end of which extends into the lifting limiting groove.

[0012] The side tube clamping mechanism includes multiple movable inner support blocks. Each fixed tube side wall is provided with multiple inner support drive components. The side tube to be welded is sleeved outside the movable inner support block. The inner support drive components will drive the movable inner support block to expand outward to clamp the side tube to be welded. The lower end of the side tube to be welded is provided with an upper welding notch.

[0013] The lifting drive mechanism is used to drive the side tube to be welded to descend, so that the upper and lower welding notches are aligned to form a welding gap. The welding torch drive mechanism drives the welding torch to rotate and weld the weld along the welding gap.

[0014] Furthermore, the connecting sleeve is also provided with a limiting ring, the outer wall of the connecting sleeve is provided with a lifting thread, the inner wall of the limiting ring is fixedly provided with a lifting internal thread, the connecting sleeve is threadedly connected to the connecting sleeve, and the limiting ring is used to limit the upper end of the side pipe to be welded.

[0015] Furthermore, the welding torch is also equipped with an elastic element, and a fixing cap is provided on the top of the welding torch. The elastic element is fitted inside and outside the welding torch, with the upper end of the elastic element abutting against the fixing cap and the lower end of the elastic element abutting against the lifting sleeve.

[0016] Furthermore, the lifting sleeve is connected to the side wall of the rotating ring sleeve via a telescopic rod assembly. The telescopic rod assembly includes a telescopic outer sleeve and a telescopic inner rod. The end of the telescopic outer sleeve is fixed to the outer wall of the rotating ring sleeve, one end of the telescopic inner rod is fixedly connected to the outer wall of the lifting sleeve, and the other end of the telescopic inner rod is slidably limited within the telescopic outer sleeve. The side wall of the telescopic outer sleeve is provided with a fastening threaded hole, and a fastening screw is provided in the fastening threaded hole. A knob cap is fixedly provided on the top of the fastening screw.

[0017] Furthermore, the movable inner support block includes an elastic heat-conducting plate and a first elastic heat-conducting sheet. The elastic heat-conducting plate is an arc-shaped plate with a sliding groove for fitting inside. The first elastic heat-conducting sheet is attached to the outer wall of the elastic heat-conducting plate.

[0018] The internal support drive component is an electric push rod, and each electric push rod has a telescopic rod. The end of the telescopic rod is provided with two elastic support plates connected in a V-shape. Each elastic support plate is provided with a sliding shaft at its end, and both sliding shafts are slidably set in the fitting sliding groove.

[0019] Furthermore, a heat-conducting groove is provided between the outer wall of the elastic heat-conducting plate and the inner wall of the first elastic heat-conducting sheet, and a second elastic heat-conducting sheet is slidably disposed in each heat-conducting groove, with the end of the second elastic heat-conducting sheet fixed to an adjacent movable inner support block.

[0020] Furthermore, the bottom of the fixed tube is also provided with an arc-shaped support base plate, and a pressure sensing switch is provided at the bottom of the support base plate. The pressure sensing switch is connected to the welding torch, the ring drive component, and the lifting drive mechanism.

[0021] Furthermore, the top of the rotating ring sleeve is provided with a driven gear ring, the side wall of the connecting sleeve body is provided with a drive mounting hole, the ring sleeve drive component is a ring sleeve drive motor, the ring sleeve drive motor is fixed in the drive mounting hole, and a drive gear is fixedly provided at the end of the ring sleeve drive motor, the drive gear meshing with the driven gear ring.

[0022] Furthermore, the main pipe clamping mechanism includes a support base block and two clamping blocks. The support base block is provided with an arc-shaped groove, in which the main pipe to be welded is supported. The two clamping blocks are slidably mounted on the fixed base, and the two clamping blocks are slidably located on both sides of the two support base blocks.

[0023] The two clamping blocks are provided with drive threaded holes respectively, and the fixed base is provided with a fixed block. The fixed block is provided with a bidirectional drive screw with a rotatable thread. The bidirectional drive screw has two threaded sections with opposite directions of rotation, and the two threaded sections pass through the two drive threaded holes respectively.

[0024] The bidirectional drive screw is also equipped with a rotating handwheel at its end.

[0025] The present invention also provides a positioning welding method for welding a sewage tee valve. The method uses the above-mentioned positioning welding device and includes the following steps:

[0026] S1: Cut the lower welding port in the middle of the main pipe to be welded, and cut the upper welding port at the lower end of the main pipe to be welded;

[0027] S2: Rotate the limiting ring to adjust the height of the top of the side tube to be welded, so as to set the weld width;

[0028] S3: Place the side tube to be welded onto the side tube clamping mechanism, so that the top of the side tube to be welded presses against the bottom of the limiting ring, and the side tube clamping mechanism clamps and fixes the side tube to be welded.

[0029] S4: The lifting drive mechanism drives the connecting sleeve to descend until the side tube clamping mechanism fixes the lower end of the half tube body through the welding port of the main tube to be welded and abuts against the lower part of the inner wall of the main tube to be welded, so that the upper welding port is aligned with the lower welding port.

[0030] S5: The welding torch drive mechanism and the welding torch start simultaneously. The welding torch drive mechanism drives the rotating ring and the welding torch to rotate along the axis of the connecting sleeve. During the rotation, the lifting drive rod drives the welding torch to move up and down, so that the welding torch head moves along a trajectory with the same shape as the lifting limit groove. During the welding process, the side plate is welded to the main pipe according to the predetermined trajectory.

[0031] The beneficial effects of the positioning welding device and positioning welding method for welding a sewage three-way valve of the present invention are as follows:

[0032] (1) The positioning welding device includes a fixed base, a lifting drive mechanism, a main pipe clamping mechanism, a side pipe clamping mechanism, and a welding torch; the main pipe clamping mechanism is set on the fixed base for positioning and clamping the main pipe to be welded, and the lower part of the lifting drive mechanism is provided with a connecting sleeve; the side pipe clamping mechanism is located at the lower end of the connecting sleeve, and the side pipe clamping mechanism can drive the movable side plate to expand outward and clamp and fix the side pipe to be welded in an inward support manner; the lifting drive mechanism can adjust the height of the side to be welded so that the upper and lower welding notches of the main pipe and the side pipe to be welded are aligned to form a welding gap. The welding torch is clamped on the connecting sleeve through the welding torch drive mechanism; the welding torch drive mechanism includes a rotating ring clamped on the connecting sleeve, a ring drive component, and a limiting sleeve, the side wall of the rotating ring is connected to the lifting sleeve, and the welding torch is raised and lowered in the lifting sleeve, with the two ends of the elastic component abutting against the welding torch and the lifting sleeve respectively; the limiting sleeve is provided with a lifting limiting groove, and the side wall of the welding torch is also provided with a fixed lifting drive rod, the end of which extends into the lifting limiting groove. During welding, the ring drive component drives the rotating ring to rotate, causing the welding torch to rotate along the axis of the connecting sleeve. During this rotation, the lifting drive rod and the lifting limit groove work together to drive the welding torch to rise and fall along the same trajectory. This allows the end of the welding torch to move along a predetermined three-dimensional trajectory under rotational drive alone, welding a weld along the welding gap and completing the welding of the three-way valve body. The positioning welding device of this invention integrates the welding torch into the side pipe clamping mechanism, enabling alignment of the welding torch and weld during side pipe positioning. Simultaneously, the welding torch drive mechanism can achieve three-dimensional spatial trajectory control of the welding torch solely through the rotation of the rotating ring. This reduces the coupling and adjustment between the welding torch drive mechanism and the positioning mechanism, lowers the control difficulty of the welding torch drive mechanism, improves welding accuracy, and reduces the cost of the welding device.

[0033] (2) The side pipe clamping mechanism of this positioning welding device includes a fixed pipe body and multiple movable side plates. Multiple clamping telescopic components are provided on the fixed pipe body, and these components are connected to the movable side plates. The side pipe clamping mechanism can drive the movable side plates to expand outwards and clamp the side pipe to be welded in an inward-supporting manner. This side pipe clamping mechanism can adapt to side pipes of different diameters within a certain range. Furthermore, the welding torch is connected to the side wall of the rotating ring sleeve via a telescopic rod assembly. When the diameter of the main pipe or side pipe to be welded changes, the distance between the welding torch and the axis of the connecting sleeve can be adjusted via the telescopic rod assembly, and a limiting sleeve with a corresponding lifting limit groove can be replaced, thus adapting to the welding of main pipes and side pipes of different diameters. This invention can well adapt to the welding of the housing part of a three-way valve with different pipe diameters, and has strong versatility.

[0034] (3) The movable side plate of the side tube clamping mechanism of the positioning welding device is fixedly provided with a first elastic heat-conducting sheet on its outer wall, and a second elastic heat-conducting sheet is slidably provided on the inner side of the first elastic heat-conducting sheet. The first elastic heat-conducting sheet and the second elastic heat-conducting sheet are in contact. When the side tube clamping mechanism clamps the side tube to be welded, the first elastic heat-conducting sheet is in contact with the inner wall of the side tube to be welded, and the second elastic heat-conducting sheet can be connected to the adjacent first elastic heat-conducting sheet to form an annular heat-conducting ring. In this way, during welding, the side tube clamping mechanism can greatly improve the heat conduction capacity of the side tube to be welded, and can ensure that the heat generated by the side tube to be welded during welding can be conducted along the entire heat-conducting ring and spread rapidly. The high temperature of the welding part is used to preheat the rest of the side tube to be welded, reduce the temperature gradient of the local high temperature area, thereby reducing the thermal stress and shrinkage stress of the three-way valve body, thereby achieving the effect of reducing welding thermal deformation and reducing welding internal stress, and thus improving the welding accuracy and welding strength of the three-way valve body.

[0035] (4) A limiting ring is rotatably provided on the connecting sleeve of the positioning welding device. The limiting ring is threaded onto the connecting sleeve and can limit the upper end of the side pipe to be welded. By rotating the limiting ring, the height of the top of the side pipe to be welded can be adjusted, and the welding gap width can be adjusted. The positioning welding device does not rely on the contact positioning of the upper and lower welding ports for the positioning of the main pipe and side pipe. This can prevent the cutting error of the upper and lower welding ports from affecting the welding accuracy of the three-way valve body. That is, the positioning welding device can use the welding gap width and weld width to compensate for the cutting error of the upper and lower welding ports of the main pipe and side pipe to be welded, and further improve the welding accuracy of the three-way valve body. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of the positioning welding device for welding the sewage three-way valve according to an embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram of the main structure of the positioning welding device for welding the sewage three-way valve according to an embodiment of the present invention (the main clamping mechanism is omitted).

[0038] Figure 3 This is a schematic diagram of the main clamping mechanism of the positioning welding device for welding a sewage three-way valve according to an embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram of the welding torch drive mechanism of the positioning welding device for welding a sewage three-way valve according to an embodiment of the present invention.

[0040] Figure 5 This is a partial structural schematic diagram of the positioning welding device for welding a sewage three-way valve according to an embodiment of the present invention.

[0041] Figure 6 This is an exploded structural diagram of the first partial structure of the positioning welding device for welding the sewage three-way valve according to an embodiment of the present invention.

[0042] Figure 7 This is a schematic diagram of the first structure of the side pipe clamping mechanism of the positioning welding device for welding a sewage three-way valve according to an embodiment of the present invention.

[0043] Figure 8 This is a schematic diagram of the second structure of the side pipe clamping mechanism of the positioning welding device for welding a sewage three-way valve according to an embodiment of the present invention.

[0044] Figure 9 This is a first structural schematic diagram of the side pipe clamping mechanism of the positioning welding device for welding a sewage three-way valve according to an embodiment of the present invention during operation.

[0045] Figure 10 This is a second structural schematic diagram of the side pipe clamping mechanism of the positioning welding device for welding sewage three-way valves in an embodiment of the present invention during operation.

[0046] Figure 11 This is a flowchart of a positioning welding method for welding a sewage three-way valve according to an embodiment of the present invention.

[0047] In the above diagram: 100-Fixed base, 101-Fixed bracket, 110-Supporting base block, 111-Fixed block, 112-Clamping block, 113-Bidirectional drive screw, 114-Slide rail groove, 200-Lifting drive mechanism, 300-Connecting sleeve, 400-Ring drive motor, 401-Drive gear, 402-Rotating ring sleeve, 411-Telescopic outer sleeve, 412-Telescopic inner rod, 413-Knob cap, 500-Welding torch, 501-Fixed cap, 502- Elastic component, 503-lifting drive rod, 600-limiting sleeve, 601-lifting limit groove, 700-fixed tube body, 701-inner support drive component, 702-elastic support plate, 703-sliding shaft, 710-elastic heat-conducting plate, 711-fitting sliding groove, 712-installation inner groove, 720-first elastic heat-conducting sheet, 721-second elastic heat-conducting sheet, 722-heat-conducting sliding groove, 730-pressure sensing switch, 800-main tube to be welded, 810-side tube to be welded. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0049] Although the steps in this invention are arranged by reference numerals, this is not intended to limit the order of the steps. Unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0050] Please refer to Figures 1 to 10 A positioning welding device for welding a sewage discharge three-way valve includes a fixed base 100, a lifting drive mechanism 200, a main pipe clamping mechanism, a side pipe clamping mechanism, a welding torch drive mechanism, and a welding torch 500.

[0051] The main pipe clamping mechanism is mounted on the fixed base 100, and the main pipe 800 to be welded is positioned and clamped on the main pipe clamping mechanism. A lower welding notch is pre-opened in the middle of the main pipe 800 to be welded. In this embodiment, the main pipe clamping mechanism includes a support base 110 and two clamping blocks 112. The support base 110 is provided with an arc-shaped groove, and the main pipe 800 to be welded is supported in the arc-shaped groove, which can center the main pipe 800 to be welded. The two clamping blocks 112 are slidably mounted on the fixed base 100 and are slidably located on both sides of the two support bases 110. Specifically, the fixed base 100 is provided with a slide rail groove 114, and the bottom of the clamping block 112 is provided with a movable locking block that slides and is limited within the slide rail groove 114.

[0052] Each of the two clamping blocks 112 has a drive threaded hole, and the fixed base 100 has a fixed block 111 located in the middle of the clamping blocks 112. The fixed block 111 has a rotatable bidirectional drive screw 113, which has two threaded sections with opposite directions of rotation, and the two threaded sections pass through the two drive threaded holes respectively. The end of the bidirectional drive screw 113 is also provided with a rotating handwheel. The middle part of the bidirectional drive screw 113 remains axially stationary relative to the fixed block 111. Driving the rotating handwheel can drive the two clamping blocks 112 to move towards or away from the fixed block 111 synchronously. Therefore, this main pipe clamping mechanism can center and position the main pipe 800 to be welded.

[0053] The lifting drive mechanism 200 is fixedly mounted above the fixed base 100, and a connecting sleeve 300 is provided at the lower part of the lifting drive mechanism 200. In this embodiment, the lifting drive mechanism 200 is a hydraulic cylinder, and the connecting sleeve 300 is fixedly connected to the lower end of its telescopic shaft. The lifting drive mechanism 200 is used to drive the connecting sleeve 300 to lift.

[0054] The side tube clamping mechanism includes multiple movable inner support blocks. Each fixed tube body 700 has multiple inner support drive members 701 on its side wall. The side tube 810 to be welded is sleeved on the movable inner support block. The inner support drive member 701 drives the movable inner support block to expand outward to clamp the side tube 810 to be welded. The lower end of the side tube 810 to be welded is provided with an upper welding notch. The lifting drive mechanism 200 is used to drive the side tube 810 to be welded to descend, so that the upper and lower welding notches are aligned to form a welding gap.

[0055] The welding torch drive mechanism is used to drive the welding torch 500 to rotate and weld along the welding gap. Specifically, the welding torch drive mechanism includes a rotating ring 402, a ring drive component 400, and a limiting sleeve 600. The rotating ring 402 is rotatably mounted on the connecting sleeve 300. A bearing can be provided between the rotating ring 402 and the connecting sleeve 300 to reduce rotational friction. The ring drive component 400 is fixed to the connecting sleeve 300 and is used to drive the rotating ring 402 to rotate on the connecting sleeve 300. A lifting sleeve is connected to the side wall of the rotating ring 402, and the welding torch 500 is movably mounted in the lifting sleeve.

[0056] Specifically, the welding torch 500 is also provided with an elastic element 502, and the top of the welding torch 500 is provided with a fixing cap 501. The elastic element 502 is fitted inside and outside the welding torch 500, with the upper end of the elastic element 502 abutting against the fixing cap 501 and the lower end of the elastic element 502 abutting against the lifting sleeve.

[0057] Specifically, the top of the rotating ring 402 is provided with a driven gear ring, the side wall of the connecting sleeve 300 is provided with a drive mounting hole, the ring drive component 400 is a ring drive motor 400, the ring drive motor 400 is fixed in the drive mounting hole, and the end of the ring drive motor 400 is fixed with a drive gear 401, which meshes perpendicularly with the driven gear ring. The ring drive motor 400 drives the drive gear 401 to rotate, which in turn drives the rotating ring 402 to rotate.

[0058] The limiting sleeve 600 is threadedly fixed onto the rotating ring sleeve 402, and the limiting sleeve 600 is located at the lower part of the rotating ring sleeve 402. The limiting sleeve 600 is provided with a lifting limiting groove 601 connected end to end. The lifting limiting groove 601 undulates up and down in the axial height direction of the limiting sleeve 600. The shape of the lifting limiting groove 601 is pre-designed to match the required welding trajectory. The side wall of the welding torch 500 is also provided with a fixed lifting drive rod 503, the end of which extends into the lifting limiting groove 601. When the welding torch drive mechanism drives the rotating ring sleeve 402 to rotate... The lifting drive rod 503 can drive the welding torch 500 to move up and down under the limiting action of the lifting limit groove 601. The lower end of the welding torch 500 has a bent part, and the welding head at the bottom of the welding torch 500 extends to the welding gap. Therefore, after the welding torch drive mechanism and the welding torch 500 are started at the same time, the welding torch drive mechanism can drive the welding torch 500 to rotate and move up and down, thereby welding the weld seam of the predetermined trajectory at the upper and lower welding notches of the main pipe 800 and the side pipe 810 according to the predetermined trajectory, and welding the main pipe 800 and the side pipe 810 vertically together, thereby completing the welding of the three-way valve body.

[0059] The lifting drive rod 503 and the lifting limit groove 601 of the present invention cooperate to drive the welding torch 500 to rise and fall along the same lifting trajectory. This allows the welding torch 500 to move its welding head along a predetermined three-dimensional trajectory under rotational drive alone, welding a weld along the welding gap and completing the welding of the three-way valve body. The positioning welding device of the present invention integrates the welding torch 500 onto the side pipe clamping mechanism, which can complete the alignment of the welding torch 500 and the weld during the positioning of the side pipe 810. At the same time, the welding torch drive mechanism can achieve the driving control of the three-dimensional trajectory of the welding torch 500 in space by only rotating the rotating ring. This reduces the coupling and debugging of the welding torch drive mechanism and the positioning mechanism, thereby reducing the control difficulty of the welding torch drive mechanism, improving welding accuracy, and reducing the cost of the welding device.

[0060] In a preferred embodiment, the connecting sleeve 300 is further provided with a limiting ring. The outer wall of the connecting sleeve 300 is provided with a lifting thread, and the inner wall of the limiting ring is fixedly provided with a lifting internal thread. The connecting sleeve 300 is threadedly connected to the connecting sleeve 300. When the side tube 810 to be welded is clamped on the side tube clamping mechanism, the top of the side tube 810 to be welded abuts against the bottom of the limiting ring, and the limiting ring can limit the upper end of the side tube 810 to be welded.

[0061] This invention allows for adjustment of the welding gap width by rotating the limiting ring to adjust the top height of the side pipe 810 to be welded. The positioning welding device does not rely on the contact positioning of the upper and lower welding joints for the positioning of the main pipe 800 and side pipe 810. This prevents cutting errors at the upper and lower welding joints from affecting the welding accuracy of the three-way valve body. In other words, the positioning welding device can compensate for cutting errors at the upper and lower welding joints of the main pipe 800 and side pipe 810 to be welded using the welding gap width and weld width, further improving the welding accuracy of the three-way valve body.

[0062] In a preferred embodiment, the lifting sleeve is connected to the side wall of the rotating ring 402 via a telescopic rod assembly. The telescopic rod assembly includes a telescopic outer sleeve 411 and a telescopic inner rod 412. One end of the telescopic outer sleeve 411 is fixed to the outer wall of the rotating ring 402. One end of the telescopic inner rod 412 is fixedly connected to the outer wall of the lifting sleeve, and the other end of the telescopic inner rod 412 is slidably limited within the telescopic outer sleeve 411. The side wall of the telescopic outer sleeve 411 is provided with a fastening threaded hole, and a fastening screw is provided in the fastening threaded hole. A knob cap 413 is fixedly provided on the top of the fastening screw. The telescopic inner rod 412 can slide within the telescopic outer sleeve 411, and the fastening screw is used to lock the telescopic inner rod 412.

[0063] The side pipe clamping mechanism of this invention can drive the movable inner support block to expand outward and clamp and fix the side pipe 810 to be welded in an internal support manner. This side pipe clamping mechanism can adapt to side pipes 810 of different diameters within a certain range. Furthermore, the welding torch 500 is connected to the side wall of the rotating ring sleeve 402 via a telescopic rod assembly. When the diameter of the main pipe 800 or side pipe 810 to be welded changes, the distance between the welding torch 500 and the axis of the connecting sleeve 300 can be adjusted via the telescopic rod assembly, and the limiting sleeve 600 with the corresponding lifting limit groove 601 can be replaced, thus adapting to the welding of main pipes 800 and side pipes 810 of different diameters. This invention can well adapt to the welding of three-way valve housings of different diameters, exhibiting strong versatility.

[0064] In a preferred embodiment, the top of the rotating ring 402 is provided with a driven gear ring, the side wall of the connecting sleeve 300 is provided with a drive mounting hole, the ring drive component 400 is a ring drive motor 400, the ring drive motor 400 is fixed in the drive mounting hole, and the end of the ring drive motor 400 is fixedly provided with a drive gear 401. The drive gear 401 meshes perpendicularly with the driven gear ring, and the ring drive motor 400 drives the drive gear 401 to rotate, thereby driving the rotating ring 402 to rotate.

[0065] refer to Figures 6 to 10 In a preferred embodiment, the inner support drive component 701 is an electric push rod, and there are three electric push rods and three movable inner support blocks. Each electric push rod has a telescopic rod. Each movable inner support block includes an elastic heat-conducting plate 710 and a first elastic heat-conducting sheet 720. The elastic heat-conducting plate 710 is an arc-shaped plate with a sliding groove 711 inside. The inner wall of the elastic heat-conducting plate 710 is provided with an inner mounting groove 712. The first elastic heat-conducting sheet 720 is attached to the outer wall of the elastic heat-conducting plate 710. The elastic heat-conducting plate 710 is made of elastic heat-resistant silicone material.

[0066] The telescopic rod has two elastic support plates 702 connected in a V-shape at its end. Each elastic support plate 702 has a sliding shaft 703 at its end. Both sliding shafts 703 pass through the mounting inner groove 712 and are slidably disposed within the fitting sliding groove 711. A heat-conducting groove 722 is provided between the outer wall of the elastic heat-conducting plate 710 and the inner wall of the first elastic heat-conducting sheet 720. A second elastic heat-conducting sheet 721 is slidably disposed within each heat-conducting groove 722. The end of the second elastic heat-conducting sheet 721 is fixed to an adjacent movable inner support block. The first elastic heat-conducting sheet 720 and the second elastic heat-conducting sheet 721 are made of copper or aluminum, which have excellent thermal conductivity and good elasticity.

[0067] When side tubes 810 of different diameters are clamped, the electric push rod pushes the telescopic rod to move outward. At this time, the middle of the outer wall of the movable inner support block first contacts the inner wall of the side tube 810. Then the telescopic rod continues to move outward, and the elastic support plate 702 rotates outward under the squeezing action of the telescopic rod. The sliding shaft 703 at the end of the elastic support plate 702 can slide to both ends of the sliding groove 711. This forces the movable inner support block to deform and fit against the inner wall of the side tube 810. This can increase the area between the first elastic heat-conducting plate 720 and the inner wall of the side tube 810 while clamping and fixing the side tube 810. During the outward expansion of the movable inner support block, the second elastic heat-conducting plate 721 slides in the heat-conducting groove 722 and always fits against the inner wall of the first elastic heat-conducting plate 720. In this way, the first elastic heat-conducting plate 720 and the second elastic heat-conducting plate 721 form an annular and expandable heat-conducting ring.

[0068] In this way, during welding, the expandable heat-conducting ring formed by the first elastic heat-conducting sheet 720 and the second elastic heat-conducting sheet 721 can greatly improve the heat conduction capacity of the side tube 810 to be welded. It can ensure that the heat generated by the side tube 810 to be welded during welding can be conducted and quickly diffused along the entire heat-conducting ring. The high temperature of the welding part is used to preheat the rest of the side tube 810 to be welded, reducing the temperature gradient in the local high temperature area, thereby reducing thermal stress and shrinkage stress of the three-way valve body. This achieves the effect of reducing welding thermal deformation and reducing welding internal stress, thereby improving the welding accuracy and welding strength of the three-way valve body.

[0069] In a preferred embodiment, the bottom of the fixed tube 700 is further provided with an arc-shaped support base plate. A pressure sensing switch 730 is located at the bottom of the support base plate. The pressure sensing switch 730 is a retractable pressure sensing switch, connected to the welding torch 500, the ring drive component 400, and the lifting drive mechanism 200. When the bottom of the fixed tube 700 passes through the lower welding port of the main tube 800 to be welded and abuts against the inner wall of the bottom of the main tube 800, the pressure sensing switch 730 retracts into the fixed tube and is triggered. At this time, the side tube 810 to be welded descends to its position, the lifting drive mechanism 200 stops descending, and the welding torch 500 and the ring drive component 400 can begin the welding process. It should be noted that there are various types of welding torches 500. The welding torch 500 used in this invention is prior art. The type and model of the welding torch 500 can be selected according to actual needs. The structure and working principle of the welding torch 500 are not limited in detail here.

[0070] In a preferred embodiment, the top of the rotating ring 402 is provided with a driven gear ring, the side wall of the connecting sleeve 300 is provided with a drive mounting hole, the ring drive component 400 is a ring drive motor 400, the ring drive motor 400 is fixed in the drive mounting hole, and the end of the ring drive motor 400 is fixedly provided with a drive gear 401. The drive gear 401 meshes perpendicularly with the driven gear ring, and the ring drive motor 400 drives the drive gear 401 to rotate, thereby driving the rotating ring 402 to rotate.

[0071] The present invention also provides a positioning welding method for welding a sewage tee valve. The method uses the above-mentioned positioning welding device and includes the following steps:

[0072] S1: Cut a lower welding port in the middle of the main pipe 800 to be welded, and cut an upper welding port at the lower end of the main pipe 800 to be welded;

[0073] S2: Rotate the limiting ring to adjust the top height of the side tube 810 to be welded, so as to set the weld width;

[0074] S3: The side tube 810 to be welded is clamped onto the side tube clamping mechanism, so that the top of the side tube 810 to be welded presses against the bottom of the limiting ring, and the side tube clamping mechanism clamps and fixes the side tube 810 to be welded.

[0075] S4: The lifting drive mechanism 200 drives the connecting sleeve 300 to descend until the lower end of the side tube clamping mechanism fixes the half tube body through the welding port of the main tube to be welded 800 and abuts against the lower part of the inner wall of the main tube to be welded 800, so that the upper welding notch and the lower welding port are aligned.

[0076] S5: The welding torch drive mechanism and the welding torch 500 start simultaneously. The welding torch drive mechanism drives the rotating ring 402 and the welding torch 500 to rotate along the axis of the connecting sleeve 300. During the rotation, the lifting drive rod 503 drives the welding torch 500 to move up and down, so that the welding head of the welding torch 500 moves along a trajectory with the same shape as the lifting limit groove 601. During the welding process according to the predetermined trajectory, the side tube 810 is welded onto the main tube 800.

[0077] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0078] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0079] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0080] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0081] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0082] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A positioning welding device for welding a sewage discharge three-way valve, characterized in that: It includes a fixed base (100), a lifting drive mechanism (200), a side tube clamping mechanism, a welding torch drive mechanism, and a welding torch (500). The main pipe to be welded (800) is positioned and clamped on the fixed base (100); the lower part of the lifting drive mechanism (200) is provided with a connecting sleeve (300). The welding torch drive mechanism includes a rotating ring sleeve (402), a ring sleeve drive component, and a limiting sleeve (600). The rotating ring sleeve (402) is rotatably mounted on the connecting sleeve (300), and the ring sleeve drive component is fixed on the connecting sleeve (300). The ring sleeve drive component is used to drive the rotating ring sleeve (402) to rotate on the connecting sleeve (300). A lifting sleeve is connected to the side wall of the rotating ring sleeve (402), and the welding torch (500) is movably mounted in the lifting sleeve. A lifting limiting groove (601) is provided on the limiting sleeve (600), and a lifting drive rod (503) is fixedly mounted on the side wall of the welding torch (500). The end of the lifting drive rod (503) extends into the lifting limiting groove (601). The side tube clamping mechanism includes an inner support drive (701) and a movable inner support block. The side tube to be welded (810) is sleeved on the movable inner support block. The inner support drive (701) drives the movable inner support block to expand outward to clamp the side tube to be welded (810). The lifting drive mechanism (200) is used to drive the side tube (810) to be welded to descend, and a welding gap is formed between the main tube (800) to be welded and the side tube (810) to be welded. The welding torch drive mechanism drives the welding torch (500) to rotate and weld along the welding gap. The connecting sleeve (300) is also provided with a limiting ring. The outer wall of the connecting sleeve (300) is provided with a lifting thread, and the inner wall of the limiting ring is fixedly provided with a lifting internal thread. The limiting ring is threadedly connected to the connecting sleeve (300). The limiting ring is used to limit the upper end of the side tube (810) to be welded. The movable inner support block includes an elastic heat-conducting plate (710) and a first elastic heat-conducting sheet (720). The elastic heat-conducting plate (710) is an arc-shaped plate with a sliding groove (711) inside. The first elastic heat-conducting sheet (720) is attached to the outer wall of the elastic heat-conducting plate (710). The internal support drive component (701) is an electric push rod. The electric push rod has a telescopic rod. The end of the telescopic rod is provided with two elastic support plates (702) connected in a V-shaped structure. Each elastic support plate (702) is provided with a sliding shaft (703) at its end. Both sliding shafts (703) are slidably disposed in the fitting sliding groove (711). A heat-conducting groove (722) is provided between the outer wall of the elastic heat-conducting plate (710) and the inner wall of the first elastic heat-conducting sheet (720). A second elastic heat-conducting sheet (721) is slidably arranged in each heat-conducting groove (722), and the end of the second elastic heat-conducting sheet (721) is fixed to the adjacent movable inner support block.

2. A positioning welding device for welding a sewage discharge three-way valve according to claim 1, characterized in that: The welding torch (500) is also provided with an elastic element (502), and a fixing cap (501) is provided on the top of the welding torch (500). The elastic element (502) is fitted inside and outside the welding torch (500), with the upper end of the elastic element (502) abutting against the fixing cap (501) and the lower end of the elastic element (502) abutting against the lifting sleeve.

3. A positioning welding device for welding a sewage discharge three-way valve according to claim 1, characterized in that: The lifting sleeve is connected to the side wall of the rotating ring (402) via a telescopic rod assembly. The telescopic rod assembly includes a telescopic outer sleeve (411) and a telescopic inner rod (412). The end of the telescopic outer sleeve (411) is fixed to the outer wall of the rotating ring (402). One end of the telescopic inner rod (412) is fixedly connected to the outer wall of the lifting sleeve. The other end of the telescopic inner rod (412) is slidably limited inside the telescopic outer sleeve (411). The side wall of the telescopic outer sleeve (411) is provided with a fastening threaded hole. A fastening screw is provided in the fastening threaded hole. A knob cap (413) is fixedly provided on the top of the fastening screw.

4. A positioning welding device for welding a sewage discharge three-way valve according to claim 1, characterized in that: The bottom of the fixed tube (700) is also provided with an arc-shaped support base plate, and a pressure sensing switch (730) is provided at the bottom of the support base plate.

5. A positioning welding device for welding a sewage discharge three-way valve according to claim 1, characterized in that: The rotating ring (402) is provided with a driven gear ring at the top, and the connecting sleeve (300) is provided with a drive mounting hole on the side wall. The ring drive component is a ring drive motor (400), which is fixed in the drive mounting hole. The end of the ring drive motor (400) is provided with a drive gear (401), which meshes with the driven gear ring.

6. A positioning welding device for welding a sewage discharge three-way valve according to claim 1, characterized in that: It also includes a main pipe clamping mechanism, which includes a support base block (110) and two clamping blocks (112). The support base block (110) is provided with an arc groove, and the main pipe (800) to be welded is supported in the arc groove. The two clamping blocks (112) are slidably disposed on the fixed base (100) and are slidably located on both sides of the two support base blocks (110). Two clamping blocks (112) are provided with drive thread holes respectively, and a fixed block (111) is provided on the fixed base (100). A bidirectional drive screw (113) is rotatably provided on the fixed block (111). The bidirectional drive screw (113) has two threaded sections with opposite directions of rotation, and the two threaded sections pass through the two drive thread holes respectively. The bidirectional drive screw (113) is also equipped with a rotating handwheel at its end.

7. A positioning welding method for welding a sewage discharge three-way valve, characterized in that: This method uses the positioning welding apparatus of any one of claims 2-6, and the method includes the following steps: S1: Cut a lower welding port in the middle of the main pipe (800) to be welded, and cut an upper welding port at the lower end of the side pipe (801) to be welded; S2: Rotate the limiting ring to adjust the top height of the side tube (810) to be welded in order to set the weld width; S3: The side tube (810) to be welded is clamped onto the side tube clamping mechanism, so that the top of the side tube (810) to be welded presses against the bottom of the limiting ring, and the side tube clamping mechanism clamps and fixes the side tube (810) to be welded. S4: The lifting drive mechanism (200) drives the connecting sleeve (300) to descend until the lower end of the side tube clamping mechanism fixes the half tube body through the welding port of the main tube to be welded (800) and abuts against the lower part of the inner wall of the main tube to be welded (800), so that the upper welding notch and the lower welding port are aligned. S5: The welding torch drive mechanism and the welding torch (500) start simultaneously. The welding torch drive mechanism drives the rotating ring sleeve (402) and the welding torch (500) to rotate along the axis of the connecting sleeve (300). During the rotation, the lifting drive rod (503) drives the welding torch (500) to move up and down, so that the welding torch welds the side pipe (801) to be welded onto the main pipe (800) to be welded according to the predetermined trajectory.

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