A bimetallic composite pipe fitting welding apparatus

Abstract

The present application relates to the technical field of pipe welding equipment, and discloses a double-metal composite pipe welding-on equipment, which comprises a support, a welding frame rotatably arranged on the support, and a welding-on mechanism for welding on the inner wall of the pipe port, two work stations for alternately entering the welding-on position are arranged on the welding frame, each work station is provided with a carrier disc, a positioning support mechanism and a rotating mechanism, the positioning support mechanism is used for supporting and driving the pipe to rotate, and the rotating mechanism is used for driving the carrier disc to rotate so as to realize the welding-on of the inner wall of the pipe port at both ends; and an alternating auxiliary mechanism is arranged on the positioning support mechanism. The present application can consider the double-end welding-on, axial limiting and rolling material moving in the continuous processing process, reduce independent driving and secondary clamping, and improve the pipe port welding-on processing efficiency and stability.

Description

Technical Field

[0001] This invention relates to the field of metal pipe welding equipment technology, and in particular to a bimetallic composite pipe welding equipment. Background Technology

[0002] Bimetallic composite pipe fittings are typically formed by combining a pressure-bearing base layer with a corrosion-resistant, wear-resistant, or erosion-resistant composite layer. They are commonly used in petrochemical, metallurgical, and slurry transportation applications. After cutting, beveling, or end shaping, these pipe fittings are prone to issues such as exposed composite layer sections, insufficient continuity of the inner corrosion-resistant layer, or reduced protection in the end transition area. Therefore, it is usually necessary to perform overlay welding on the inner wall of the pipe fitting end to form a continuous corrosion-resistant or wear-resistant protective layer in the circumferential area of ​​the inner wall of the end, thereby improving the reliability of the pipe fitting end during subsequent connection and media transportation.

[0003] In existing bimetallic composite pipe end welding operations, the pipes are mostly supported by ordinary roller frames or fixed support fixtures, and then welded to the inner wall of the port with the help of welding robots or welding guns. However, ordinary support fixtures usually only play a supporting and rotating role. During the rotation welding process, the pipes are prone to axial movement, which affects the positional stability of the circumferential weld bead on the inner wall of the port. At the same time, after the pipe is welded at one end, manual or external handling equipment is required to assist in turning the direction and transferring the material. This results in poor continuity of continuous processing at both ends of a single pipe, long downtime, and difficulty in meeting the requirements of axial positioning, direction turning, and convenient material transfer during the pipe welding process. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that existing bimetallic composite pipe fitting end wall surfacing equipment mostly relies on ordinary support tooling to support and rotate the pipe fitting, which makes it difficult to simultaneously take into account the axial positioning of the pipe fitting, the surfacing of both ends and convenient loading and unloading during continuous processing, resulting in low processing continuity and low operating efficiency. Therefore, we propose a bimetallic composite pipe fitting surfacing equipment.

[0005] To achieve the above objectives, this application adopts the following technical solution: a bimetallic composite pipe welding equipment, including a support, a welding frame rotatably mounted on the support, and a welding mechanism mounted on the support;

[0006] The welding frame is equipped with two stations for alternating entry into the welding position. Each station is equipped with a carrier plate, a positioning support mechanism on the carrier plate, and a turning mechanism for driving the carrier plate to rotate.

[0007] The positioning support mechanism is used to support the pipe fitting and drive the pipe fitting to rotate around its own axis. The turning mechanism is used to drive the carrier plate to rotate after the inner wall of one end of the pipe fitting is welded, so that the other end of the pipe fitting faces the welding mechanism.

[0008] The positioning support mechanism is equipped with an alternating auxiliary mechanism, which includes a limiting component for restricting the axial displacement of the pipe fitting during the welding stage, a material transfer component for providing rolling support to the pipe fitting during the loading and unloading stage, and a guiding component for guiding the alternating movement of the limiting component and the material transfer component.

[0009] The guiding component is driven by the pushing component and the turning mechanism. After the turning mechanism completes the turning action of the carrier tray, it can continue to drive the guiding component to move through the pushing component, so that the limiting component switches from the limiting state to the avoidance state, and the material transfer component switches from the hidden state to the extended support state.

[0010] Preferably, a gear ring is provided at the bottom of the welding frame, and a first motor is provided on the support. The output end of the first motor is provided with a first gear that meshes with the gear ring. The first motor drives the welding frame to rotate relative to the support through the first gear and the gear ring, so that the two workstations can alternately correspond to the welding mechanism.

[0011] Preferably, the turning mechanism includes a base frame disposed at the bottom of the welding frame, a second motor disposed on the base frame, an incomplete gear being drivenly connected to the output end of the second motor, and a second gear corresponding to the incomplete gear being disposed at the bottom of the carrier plate;

[0012] The incomplete gear has teeth for meshing with the second gear. When the teeth of the incomplete gear mesh with the second gear, the incomplete gear drives the second gear and the carrier to rotate, thereby achieving the directional reversal of the pipes on the carrier.

[0013] Preferably, the turning mechanism further includes a locking disc disposed at the bottom of the second gear and a locking arc disposed at the bottom of the incomplete gear, wherein the locking disc is a disc-shaped structure with an arc-shaped groove;

[0014] When the teeth of the incomplete gear mesh with the second gear, the locking arc separates from the locking disc;

[0015] When the teeth of the incomplete gear separate from the second gear, the locking arc enters the arc-shaped groove of the locking disc to restrict the second gear and the carrier disc from continuing to rotate.

[0016] Preferably, the positioning support mechanism includes two support rollers rotatably mounted on the carrier plate, with a support gap between the two support rollers for supporting the pipe fitting, and the support gap being smaller than the outer diameter of the pipe fitting.

[0017] A third motor is also provided on the carrier plate. The output end of the third motor and one end of at least one support roller are provided with pulleys. A belt is wound between the corresponding pulleys. The third motor drives the support roller to rotate through the pulleys and belt, so that the support roller can drive the pipe to rotate around its own axis.

[0018] Preferably, the limiting component of the alternating auxiliary mechanism includes a limiting arm that is movably arranged along the radial direction of the support roller. The limiting arm is located at the end of the support roller, and the limiting arms at the same end are evenly arranged along the circumference of the support roller.

[0019] The limiting arm can limit the end of the pipe when it extends out of the outer circumference of the support roller, and can avoid the pipe when it retracts to the inner side of the support roller.

[0020] Preferably, the material transfer component of the alternating auxiliary mechanism includes a material transfer arm that is movably arranged radially along the support roller. Multiple material transfer arms are arranged along the length direction of the support roller, and a material transfer roller is rotatably arranged at the end of the material transfer arm away from the axis of the support roller.

[0021] When the transfer arm extends out of the outer periphery of the support roller, the transfer roller can lift the pipe upward and separate the pipe from the outer wall of the support roller, so that the pipe can roll and transfer in a direction parallel to the axis of the support roller.

[0022] Preferably, the guiding component of the alternating auxiliary mechanism includes an inner shaft that is movably disposed on the inner side of the support roller along the axial direction of the support roller. The inner shaft is provided with a first guiding groove corresponding to the limiting arm and a second guiding groove corresponding to the material transfer arm. The guiding directions of the first guiding groove and the second guiding groove are opposite.

[0023] When the inner shaft moves along the axial direction of the support roller, the first guide chute and the second guide chute respectively guide the limiting arm and the transfer arm to switch in opposite directions, so that the transfer arm extends when the limiting arm retracts, and the transfer arm is hidden when the limiting arm extends.

[0024] Preferably, the pushing component includes a traction arm that is movably mounted on the carrier plate along the axial direction of the support roller. The upper end of the traction arm is rotatably connected to the inner shaft, and the lower ends of the traction arms corresponding to the two support rollers on the same carrier plate are connected to a U-shaped traction frame.

[0025] The pushing component also includes a drive column disposed on the incomplete gear, the drive column being used to push the U-shaped traction frame to displacement;

[0026] When the incomplete gear drives the second gear and the carrier plate to rotate 180 degrees, the drive column corresponds to the U-shaped traction frame. The incomplete gear continues to rotate and can push the closed end of the U-shaped traction frame to move through the drive column.

[0027] Preferably, the inner wall of the support roller and the outer wall of the inner shaft are provided with corresponding convex rings, and a first elastic element is provided between the corresponding convex rings. The first elastic element is used to drive the inner shaft to reset.

[0028] A second elastic element is provided between the limiting arm and the inner wall of the support roller. The second elastic element is used to drive the limiting arm to hide inside the support roller.

[0029] A third elastic element is provided between the transfer arm and the inner wall of the support roller. The third elastic element is used to drive the transfer arm to reset to the inside of the support roller.

[0030] The technical effects and advantages of this invention are as follows:

[0031] This invention sets up two workstations on the welding frame, and equips each workstation with a rotatable carrier plate and a positioning support mechanism for driving the rotation of the pipe fitting. This allows the other workstation to perform loading / unloading or preparation for processing while one workstation is in the process of welding the inner wall of the port, thus forming an alternating continuous processing cycle. At the same time, the turning mechanism can drive the carrier plate to rotate within the same workstation, so that after the pipe fitting has completed welding the inner wall of one end of the port, it can be switched to the welding position of the other end without re-lifting and reversing. With the support roller driving the pipe fitting to rotate circumferentially, the welding mechanism can stably complete the circumferential welding of the inner walls of both ends of the pipe fitting, reducing manual turning, secondary clamping and downtime, and improving the continuity and consistency of the welding process at the ends of bimetallic composite pipe fittings.

[0032] This invention further integrates the limiting component, the material transfer component, and the guiding component into the support roller, so that the support roller not only supports and drives the pipe to rotate, but can also switch between axial limiting and rolling material transfer states according to the processing sequence. During the welding stage, the limiting arm extends and forms an axial constraint on the end of the pipe, making it less prone to lateral movement when the pipe rotates with the support roller, ensuring the stability of the circumferential welding position on the inner wall of the port. During the loading and unloading stage, the turning mechanism continues to operate after completing the tray turning, and pushes the closed end of the U-shaped traction frame through the drive column, causing the traction arm to drive the inner shaft to move axially, thereby causing the limiting arm to retract and the material transfer arm to extend, with the material transfer roller supporting the pipe and forming a rolling support. Thus, the turning mechanism can not only switch the welding direction at both ends of the pipe at different times, but also drive the alternating auxiliary mechanism to complete the conversion between the limiting state and the material transfer state, reducing the need for independent limiting drive and material transfer drive. The structure has a high degree of integration, saves space, and has a compact action connection, which can better adapt to the continuous welding processing of batch bimetallic composite pipes. Attached Figure Description

[0033] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the bracket, welding frame, and carrier plate of the present invention in a disassembled state; Figure 3 This is a schematic diagram of the structure of the present invention from the bottom view when the carrier and the base frame are separated. Figure 4This is a schematic diagram of the structure of the present invention with the support roller and carrier plate separated. Figure 5 This is a schematic diagram of the structure of the incomplete gear and the second gear of the present invention in their disassembled state; Figure 6 This is a schematic diagram of the overall structure of the supporting roller and U-shaped traction frame of the present invention; Figure 7 This is a schematic diagram of the structure of the incomplete gear, the second gear, and the U-shaped traction frame in the initial state of the present invention. Figure 8 This is a schematic diagram of the structure of the present invention after the incomplete gear drives the second gear to rotate half a revolution. Figure 9 This is a schematic cross-sectional view of the supporting roller structure of the present invention; Figure 10 This is a schematic diagram of the material transfer arm of the present invention; Figure 11 This is a schematic diagram of the structure of the material transfer roller of the present invention supporting the pipe.

[0034] Legend: 1. Bracket; 2. Welding frame; 3. Welding mechanism; 4. Support roller; 5. Carrier plate; 6. Gear ring; 7. First gear; 8. First motor; 9. Base frame; 10. U-shaped traction frame; 11. Traction arm; 12. Second motor; 13. Incomplete gear; 14. Second gear; 15. Third motor; 16. Belt; 17. Pulley; 18. Drive column; 19. Locking arc; 20. Locking disc; 21. Limiting arm; 22. Transfer roller; 23. Inner shaft; 24. Guide shaft; 25. Convex ring; 26. First elastic element; 27. First guide groove; 28. Second guide groove; 29. ​​Transfer arm; 30. Friction-reducing roller; 31. Second elastic element; 32. Third elastic element. Detailed Implementation

[0035] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0036] Reference Figure 1As shown, the present invention provides a technical solution: a bimetallic composite pipe welding equipment for circumferentially welding the inner walls of the two ends of a bimetallic composite pipe. Bimetallic composite pipes typically have an outer pressure-bearing substrate and an inner corrosion-resistant layer. After pipe cutting or end processing, the composite layer cross-section is easily exposed at the ends. Therefore, by circumferentially welding the inner walls of the two ends, a continuous corrosion-resistant weld band can be formed on the inner wall of the port, providing edge sealing protection for the end interface between the inner corrosion-resistant layer and the outer substrate. The equipment includes a support 1 and a welding mechanism 3 mounted on the support 1. The support 1 is a hollow cylindrical structure, and the welding mechanism 3 is installed inside the support 1. The welding mechanism 3 can employ a multi-degree-of-freedom welding robot. The end of the welding robot is equipped with a welding torch for extending into the inner side of the pipe port. The welding torch cooperates with a wire feeding mechanism, a welding power source, and a shielding gas supply component to perform arc welding or plasma arc welding on the inner wall of the port during pipe rotation. The welding mechanism 3 employs mature technology, and the present invention will not elaborate further.

[0037] It also includes a welding frame 2 rotatably mounted on the support 1. The welding frame 2 has two workstations, each corresponding to a carrier plate 5. One carrier plate 5 rotates with the welding frame 2 to the corresponding position of the welding mechanism 3 and serves as the welding workstation. The other carrier plate 5 is in the loading / unloading or waiting-to-process workstation, so that the pipe welding operation and the loading / unloading operation can be carried out alternately at different workstations. The carrier plate 5 is equipped with a positioning support mechanism for supporting the pipe. The carrier plate 5 is disc-shaped and rotatably mounted on the welding frame 2. When the carrier plate 5 rotates, it can drive the pipe on it to change its overall direction, so that the same welding mechanism 3 can face the inner walls of the two ends of the pipe in sequence without changing the clamping reference.

[0038] Furthermore, refer to Figure 2 As shown, in order to achieve the rotation of the welding frame 2, a gear ring 6 is installed at the bottom of the welding frame 2, and a first motor 8 is installed on the bracket 1. The output end of the first motor 8 is provided with a first gear 7 driven by the first motor 8 to rotate and mesh with the gear ring 6. Thus, the welding frame 2 is driven to rotate relative to the bracket 1 through the meshing transmission of the first gear 7 and the gear ring 6. The first motor 8 can drive the welding frame 2 to swing back and forth or rotate intermittently according to the angular interval between the two work positions, so that the pipes that have been welded leave the corresponding position of the welding mechanism 3, and at the same time, the pipes to be welded enter the corresponding position of the welding mechanism 3.

[0039] Reference Figure 3As shown, in order to achieve the rotation of the carrier plate 5, a turning mechanism is provided at the bottom of the welding frame 2. The turning mechanism includes a base frame 9 located at the bottom of the welding frame 2, a second motor 12 mounted on the base frame 9, and an incomplete gear 13 driven to rotate by the second motor 12 at the upper end of the base frame 9. A shaft-like structure is mounted at the bottom of the carrier plate 5, and a second gear 14 corresponding to the incomplete gear 13 is mounted on the shaft-like structure. The tooth segments of the incomplete gear 13 are used to mesh with the second gear 14 within a predetermined angle range, and the transmission relationship between the incomplete gear 13 and the second gear 14 is set to be able to drive the second gear 14 to rotate 180 degrees in one meshing stroke. When the second gear 14 drives the carrier plate 5 to rotate 180 degrees, the pipe on the carrier plate 5 completes the end turning, thereby turning the other end of the pipe that has completed the inner wall cladding to the corresponding direction of the cladding mechanism 3, so as to continue the inner wall cladding of the other end.

[0040] Reference Figure 4 As shown, the positioning support mechanism includes support rollers 4 rotatably mounted at both ends of the top of the carrier plate 5. The gap between the two support rollers 4 is smaller than the diameter of the pipe fitting. After the pipe fitting is placed between the two support rollers 4, it is supported by the two support rollers 4 together. The axes of the two support rollers 4 are basically parallel to the axis of the pipe fitting. When the support rollers 4 rotate, the friction between their outer walls and the outer walls of the pipe fitting drives the pipe fitting to rotate around its own axis, so that the welding torch does not need to make a complete circular motion around the narrow inner wall of the pipe fitting to complete the circumferential welding of the inner wall of the port. In actual installation, the outer wall of the support rollers 4 can be provided with a wear-resistant and anti-slip layer or a knurled contact surface to improve the rotational stability of the pipe fitting.

[0041] To achieve the rotation of the support roller 4, a third motor 15 is installed on the carrier plate 5. A corresponding pulley 17 is provided at one end of the support roller 4 and the output end of the third motor 15. A belt 16 is wound around the two corresponding pulleys 17. The third motor 15 achieves the rotation of the support roller 4 through the cooperation of the pulleys 17 and the belt 16, thereby realizing the rotation of the pipe fitting. By adjusting the speed of the third motor 15, the pipe fitting can be continuously rotated at a speed suitable for welding. The welding mechanism 3 maintains the welding gun insertion depth and welding gun angle according to the position of the pipe fitting end. The two work together to form a stable annular weld bead.

[0042] In addition, such as Figure 6 , Figures 9-11As shown, the present invention also includes an alternating auxiliary mechanism on the support roller 4. The alternating auxiliary mechanism can limit the axial movement of the pipe fitting during welding and rotation. This part is a limiting component. The alternating auxiliary mechanism can also facilitate the displacement and loading / unloading of the pipe fitting after welding. This part is a material transfer component. In order to realize the switching between the limiting state and the material transfer state, the alternating auxiliary mechanism also includes a guiding component. Since the limiting component and the material transfer component are both integrated on the support roller 4, the support roller 4 not only undertakes the function of rotating and driving the pipe fitting, but also can form axial limiting support and low friction material transfer support in different processes, thereby avoiding the need to configure an independent clamping mechanism or material transfer bracket at the same work station.

[0043] Furthermore, the limiting component includes limiting arms 21 that are radially movably disposed at both ends of the support roller 4. The limiting arms 21 at the same end are arranged circumferentially around the support roller 4. When the limiting arms 21 are extended, they are used to face the end of the pipe fitting, thereby limiting the axial movement of the pipe fitting along the support roller 4. When the limiting arms 21 are retracted, they are used to avoid axial displacement of the pipe fitting. During the welding process on the inner wall of the pipe fitting port, the pipe fitting needs to rotate continuously with the support roller 4. The limiting arms 21 form a low-friction limiting on the end of the pipe fitting, which can reduce the risk of axial displacement of the pipe fitting caused by welding gun contact, rotational friction difference or port heating.

[0044] The material transfer component includes a material transfer arm 29 that is radially movably disposed on the inner side wall of the support roller 4. Multiple material transfer arms 29 are disposed along the length of the support roller 4. A material transfer roller 22 is rotatably disposed at the end of the material transfer arm 29 away from the axis of the support roller 4, and the axis of the material transfer roller 22 is perpendicular to the axis of the support roller 4. When the material transfer arm 29 drives the material transfer roller 22 to extend, the material transfer roller 22 lifts the pipe from the outside of the support roller 4, so that the pipe is separated from the supporting outer wall of the support roller 4. The pipe can roll and move on the material transfer roller 22 in a direction parallel to the axial direction of the support roller 4. Thus, the pipe can be pushed in or pushed out at the loading and unloading station, reducing the clamping waiting time and surface scratches caused by directly lifting the pipe.

[0045] The guiding component includes an inner shaft 23 that is movably disposed inside the support roller 4 along the axial direction of the support roller 4. To increase the stability of the inner shaft 23, a guide shaft 24 is installed inside the support roller 4, and the inner shaft 23 is movably disposed outside the guide shaft 24. The guide shaft 24 can be connected to the inner shaft 23 by a key, or the guide shaft 24 can adopt a polygonal prism structure, so that the inner shaft 23 can move axially relative to the guide shaft 24 and rotate smoothly and synchronously with the support roller 4, avoiding circumferential misalignment of the guide groove position when the support roller 4 rotates. A first guide groove 27 corresponding to the limiting arm 21 is provided on the circumferential side wall at the end of the inner shaft 23. The inner wall of the first guide groove 27 is a slope, and the end of the limiting arm 21 near the axis of the support roller 4 extends to the inner side of the first guide groove 27.

[0046] Furthermore, when the limiting arm 21 corresponds to the end of the first guide groove 27 away from the axis of the supporting roller 4, the limiting arm 21 protrudes from the side wall of the supporting roller 4; when the limiting arm 21 corresponds to the end of the first guide groove 27 close to the axis of the supporting roller 4, the limiting arm 21 is hidden. To facilitate the automatic hiding of the limiting arm 21, a second elastic element 31 is provided between the limiting arm 21 and the inner wall of the supporting roller 4. The second elastic element 31 is preferably a compression spring sleeved on the outside of the limiting arm 21. The second elastic element 31 is used to apply a restoring force toward the inner side of the support roller 4 to the limiting arm 21. When the inner shaft 23 moves to the point where the lower region of the first guide groove 27 corresponds to the limiting arm 21, the limiting arm 21 retracts under the action of the second elastic element 31. When the higher region of the first guide groove 27 corresponds to the limiting arm 21, the limiting arm 21 is pushed out by the inclined surface. Specifically, a protruding structure can be provided on the side wall of the limiting arm 21, and the second elastic element 31 is located between the protruding structure and the inner wall of the support roller 4.

[0047] A second guide groove 28, corresponding to the transfer arm 29, is provided on the side wall of the inner shaft 23. One end of the transfer arm 29 extends into the second guide groove 28. The second guide groove 28 is similar to the first guide groove 27, with an inclined inner wall, and the inclination direction is opposite to that of the inner wall of the first guide groove 27. Through the opposite inclination of the first guide groove 27 and the second guide groove 28, the inner shaft 23 can simultaneously complete the retraction of the limiting arm 21 and the extension of the transfer arm 29 with a single axial displacement, or simultaneously complete the retraction of the limiting arm 21. The extension of the limiting arm 21 and the retraction of the transfer arm 29; therefore, when the limiting arm 21 protrudes, the transfer arm 29 is hidden, and at this time the transfer arm 29 corresponds to the end of the second guide groove 28 near the axis of the support roller 4; when the limiting arm 21 is hidden, the transfer arm 29 extends, and at this time the transfer arm 29 corresponds to the end of the second guide groove 28 away from the axis of the support roller 4; in order to facilitate the automatic hiding and reset of the transfer arm 29, a third elastic element 32 is provided between the transfer arm 29 and the inner wall of the support roller 4, and the third elastic element 32 is preferably a compression spring.

[0048] like Figures 4-8As shown, in order to realize the action of the guiding component, a pushing component is provided between the guiding component and the turning mechanism. The pushing component includes a traction arm 11 mounted on the carrier 5 and capable of axial displacement along the support roller 4. The upper end of the traction arm 11 is rotatably connected to the inner shaft 23. Specifically, the middle part of the support roller 4 can be disconnected, and the upper end of the traction arm 11 is rotatably connected to the inner shaft 23 at the disconnected part through a bearing, so that the traction arm 11 can pull the inner shaft 23 to axial displacement along the support roller 4, while not restricting the inner shaft 23 from rotating with the support roller 4. The lower ends of the two traction arms 11 on the same carrier 5 are jointly mounted with a U-shaped traction frame 10 located at the bottom of the carrier 5. The U-shaped traction frame 10 is arranged laterally and located above the second gear 14. The two traction arms 11 move synchronously through the same U-shaped traction frame 10, so that the limiting arm 21 and the material transfer arm 29 in the two support rollers 4 maintain a consistent switching sequence.

[0049] Furthermore, when the limiting arm 21 is in the protruding state, the U-shaped traction frame 10 is positioned away from the incomplete gear 13, that is, the opening area of ​​the U-shaped traction frame 10 faces the incomplete gear 13. After the incomplete gear 13 drives the second gear 14 to rotate half a turn, the U-shaped traction frame 10 rotates with the carrier plate 5 to the position corresponding to the incomplete gear 13. A drive column 18 corresponding to the U-shaped traction frame 10 is provided on the incomplete gear 13. The drive column 18 is used to push the U-shaped traction frame 10 to move. The drive column 18 is positioned opposite to the gear teeth on the incomplete gear 13. After the incomplete gear 13 completes the gear meshing stroke of driving the second gear 14 to rotate half a turn, the drive column 18 continues to rotate ninety degrees with the incomplete gear 13 and pushes the U-shaped traction frame 10 to move laterally. The U-shaped traction frame 10 then drives the inner shaft 23 to move axially through the traction arm 11, thereby realizing the protrusion of the transfer arm 29 and the concealment of the limiting arm 21.

[0050] It should be noted that the closed section of the U-shaped traction frame 10 is not arc-shaped, but a planar structure, which facilitates the stable pushing of the drive column 18. The U-shaped traction frame 10 not only connects the two traction arms 11, but also allows the open part of the U-shaped traction frame 10 to avoid the shaft-like structure at the bottom of the carrier plate 5.

[0051] like Figure 9As shown, to facilitate the reset of the inner shaft 23 when the drive column 18 separates from the U-shaped traction frame 10, corresponding convex rings 25 are provided on the inner wall of the support roller 4 and the outer wall of the inner shaft 23. A first elastic element 26 is provided between the corresponding convex rings 25. The first elastic element 26 is a compression spring sleeved on the outside of the inner shaft 23. When the drive column 18 pushes the U-shaped traction frame 10 and moves the inner shaft 23 to the material transfer state, the first elastic element 26 is compressed. When the incomplete gear 13 rotates in the opposite direction and the drive column 18 separates from the U-shaped traction frame 10, the inner shaft 23 is reset. After the U-shaped traction frame 10 separates, the first elastic element 26 releases its elastic force and pushes the inner shaft 23, traction arm 11 and U-shaped traction frame 10 to reset as a whole, thereby causing the limiting arm 21 to extend again and the transfer arm 29 to hide again. It should be noted that the reset of the inner shaft 23 not only relies on the first elastic element 26, but also, when the drive column 18 separates from the U-shaped traction frame 10, the weight of the tube will squeeze the transfer roller 22, and then the transfer arm 29 will squeeze the inclined surface of the inner wall of the second guide groove 28, which can help push the inner shaft 23 to reset.

[0052] The limit rotation angle of the aforementioned incomplete gear 13 is 270 degrees, specifically including 180 degrees for driving the second gear 14 to rotate half a revolution and 90 degrees for driving the drive column 18 to push the U-shaped traction frame 10 to move. Afterwards, the incomplete gear 13 returns to its initial position after reversing and resetting by 270 degrees. The limit rotation angle of the second gear 14 is 180 degrees. Through this angle allocation, the incomplete gear 13 first completes the pipe end rotation, and then completes the switching between the limit state and the material transfer state. The two occur sequentially according to the fixed mechanical sequence, avoiding prematurely lifting the pipe while it is still in the welding limit position.

[0053] It should be noted that, in order to reduce friction, friction-reducing rollers 30 are rotatably provided at both ends of the limiting arm 21 and at the end of the transfer arm 29 near the axis of the support roller 4. The friction-reducing rollers 30 at the ends of the limiting arm 21 and the transfer arm 29 near the axis of the support roller 4 are used to reduce the friction with the inner walls of the first guide groove 27 and the second guide groove 28, respectively. The friction-reducing rollers 30 at the outer end of the limiting arm 21 face the end of the pipe fitting, which can reduce the friction between the limiting arm 21 and the end of the pipe fitting. Since the pipe fitting is in a rotating state during welding, the friction-reducing rollers 30 at the outer end of the limiting arm 21 contact the end of the pipe fitting, which can reduce end wear and rotational resistance while maintaining axial limiting.

[0054] In addition, such as Figure 5As shown, in order to ensure the stability of the carrier disk 5 when the incomplete gear 13 is separated from the second gear 14, a locking disc 20 is provided at the bottom of the second gear 14, and a locking arc 19 corresponding to the locking disc 20 is provided at the bottom of the incomplete gear 13. The locking arc 19 is a fan-shaped plate and is arranged opposite to the gear teeth on the incomplete gear 13. The locking disc 20 is provided with an arc-shaped groove adapted to the locking arc 19. When the incomplete gear 13 and the second gear 14 are in the meshing transmission state, the locking arc 19 separates from the arc-shaped groove on the locking disc 20 to allow the carrier disk 5 to rotate. When the incomplete gear 13 and the second gear 14 are in the separated state, the locking arc 19 enters the arc-shaped groove of the locking disc 20 to circumferentially lock the second gear 14 and the carrier disk 5, thereby ensuring that the carrier disk 5 does not rotate freely during welding and loading / unloading.

[0055] When the above-mentioned device welds a pipe fitting at one of the workstations, the two ends of the pipe fitting are limited by the limiting arm 21 during welding. The supporting roller 4 drives the pipe fitting to rotate, and the welding mechanism 3 performs circumferential welding on the inner wall of one end of the pipe fitting. After the welding of one end is completed, the incomplete gear 13 drives the second gear 14 to rotate half a turn. The second gear 14 drives the entire pipe fitting to change direction through the carrier plate 5, so that the other end of the pipe fitting is rotated to the corresponding direction of the welding mechanism 3. The welding mechanism 3 continues to perform circumferential welding on the inner wall of the other end of the pipe fitting. For the overlay welding; after the pipe fitting completes the double-end overlay welding and leaves the welding position with the welding frame 2 to reach another station, the incomplete gear 13 continues to rotate 90 degrees, the drive column 18 pushes the U-shaped traction frame 10 to move, so that the transfer arm 29 protrudes and the limiting arm 21 is hidden, the pipe fitting is supported by the transfer roller 22 and separated from the supporting outer wall of the support roller 4. At this time, the pipe fitting can be pushed along the axial direction for unloading or loading; when it is necessary to support the pipe fitting, simply rotate the transfer roller 22 to a position located diagonally below the pipe fitting.

[0056] In this invention, two workstations process alternately, while a single workstation can rotate the pipe fittings at both ends to achieve directional reversal via the rotation of the carrier plate 5. This enables continuous welding of the inner walls of the pipe fittings at both ends, reducing downtime. The positioning support mechanism, the reversing mechanism, and the pushing component work together, integrating a limiting arm 21 and a material transfer roller 22 in the support roller 4. The pipe fittings are reversed and the material transfer state is switched at different rotation stages via the incomplete gear 13, allowing the same support structure to sequentially perform rotational welding, axial anti-slip, and auxiliary loading and unloading functions. This equipment is particularly suitable for sealing the inner walls of lightweight, batch-produced bimetallic composite pipe fittings, improving processing continuity and ease of loading and unloading.

[0057] Working principle: During use, the limiting arm 21 on the support roller 4 of the loading and unloading station is initially in a hidden state, the transfer arm 29 is in an extended state, and the incomplete gear 13 is at its limit angle. The bimetallic composite pipe to be welded is placed between the two support rollers 4 of the corresponding carrier plate 5 at the loading and unloading station, so that the pipe is located between the limiting arms 21 at both ends. The incomplete gear 13 is controlled to rotate 270 degrees in the opposite direction. Through the combined action of the first elastic element 26, the third elastic element 32, and the weight of the pipe, the inner shaft 23 is displaced to the initial position. At this time, the limiting arm 21 is extended and the transfer arm 29 is hidden. The pipe fitting is supported by two support rollers 4 and its axial movement is restricted by limiting arms 21; the first motor 8 drives the first gear 7 to mesh with the gear ring 6, causing the welding frame 2 to rotate and sending the tray 5 carrying the pipe fitting to be welded to the corresponding position of the welding mechanism 3; the third motor 15 drives the support rollers 4 to rotate through the pulley 17 and belt 16, and the support rollers 4 drive the pipe fitting to rotate around its own axis, and the welding gun of the welding mechanism 3 extends into the inner side of one end of the pipe fitting and performs circumferential welding on the inner wall of the end; after the welding of one end is completed, the second motor 12 drives the incomplete gear 13 to rotate, and the incomplete gear 13 meshes with the second gear 1 4. The meshing and driving of the second gear 14 and the carrier plate 5 rotates 180 degrees, causing the other end of the pipe to rotate to the corresponding direction of the welding mechanism 3. Then, the support roller 4 continues to drive the pipe to rotate, and the welding mechanism 3 completes the welding of the inner wall of the other end. After the double-end welding is completed, the welding frame 2 rotates the carrier plate 5 away from the corresponding position of the welding mechanism 3, and at the same time sends the other carrier plate 5 into the welding position for the next pipe processing. After the carrier plate 5 that has completed the welding arrives at the loading and unloading station, the incomplete gear 13 continues to rotate 90 degrees, and the drive column 18 pushes the U-shaped traction frame 10. The U-shaped traction frame 10 drives the inner wall through the traction arm 11. As shaft 23 moves axially, the first guide groove 27 and the second guide groove 28 simultaneously switch the states of the limiting arm 21 and the transfer arm 29, causing the limiting arm 21 to be hidden and the transfer roller 22 to be extended. After the pipe is supported by the transfer roller 22, it can be pushed out along the pipe axis. After unloading, a new pipe is put in, and the incomplete gear 13 is reset 270 degrees in the opposite direction. Under the combined action of the first elastic element 26, the third elastic element 32 and the gravity of the pipe, the inner shaft 23, the traction arm 11 and the U-shaped traction frame 10 are driven to reset, causing the transfer arm 29 to be hidden and the limiting arm 21 to be extended again, thus entering the next cycle.

[0058] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A bimetallic composite pipe welding equipment, characterized in that, It includes a support frame, a welding frame rotatably mounted on the support frame, and a welding stacking mechanism mounted on the support frame; The welding frame is equipped with two stations for alternating entry into the welding position. Each station is equipped with a carrier plate, a positioning support mechanism on the carrier plate, and a turning mechanism for driving the carrier plate to rotate. The bottom of the welding frame is provided with a gear ring, and the support is provided with a first motor. The output end of the first motor is provided with a first gear that meshes with the gear ring. The first motor drives the welding frame to rotate relative to the support through the first gear and the gear ring, so that the two workstations can alternately correspond to the welding mechanism. The positioning support mechanism is used to support the pipe and drive the pipe to rotate around its own axis. The turning mechanism is used to drive the carrier plate to rotate after the inner wall of one end of the pipe is welded, so that the other end of the pipe faces the welding mechanism. The turning mechanism includes a base frame located at the bottom of the welding frame, a second motor mounted on the base frame, and an incomplete gear connected to the output end of the second motor. A second gear corresponding to the incomplete gear is located at the bottom of the carrier plate. The incomplete gear has teeth for meshing with the second gear. When the teeth of the incomplete gear mesh with the second gear, the incomplete gear drives the second gear and the carrier plate to rotate, thereby realizing the directional turning of the pipes on the carrier plate. The turning mechanism also includes a locking disc disposed at the bottom of the second gear and a locking arc disposed at the bottom of the incomplete gear. The locking disc is a disc-shaped structure with an arc-shaped groove. When the teeth of the incomplete gear mesh with the second gear, the locking arc separates from the locking disc. When the teeth of the incomplete gear separate from the second gear, the locking arc enters the arc-shaped groove of the locking disc to restrict the second gear and the carrier disk from continuing to rotate. The positioning support mechanism includes two support rollers rotatably mounted on a carrier plate, with a support gap between the two support rollers for supporting the pipe fitting, and the support gap being smaller than the outer diameter of the pipe fitting; a third motor is mounted on the carrier plate, and pulleys are mounted on the output end of the third motor and one end of at least one support roller, with a belt wound between the corresponding pulleys; the third motor drives the support rollers to rotate through the pulleys and belt, so that the support rollers can drive the pipe fitting to rotate around its own axis. The positioning support mechanism is provided with an alternating auxiliary mechanism, which includes a limiting component for restricting the axial displacement of the pipe during the welding stage, a material transfer component for forming rolling support for the pipe during the loading and unloading stage, and a guiding component for guiding the alternating action of the limiting component and the material transfer component. The limiting component of the alternating auxiliary mechanism includes a limiting arm that is movably arranged radially along the support roller. The limiting arm is located at the end of the support roller, and the limiting arms at the same end are evenly arranged along the circumference of the support roller. The limiting arm can limit the end of the pipe when it extends out of the outer circumference of the support roller, and can avoid the pipe when it is retracted to the inner side of the support roller. The material transfer component of the alternating auxiliary mechanism includes a material transfer arm that is movably arranged radially along the support roller. Multiple material transfer arms are arranged along the length of the support roller. A material transfer roller is rotatably arranged at the end of the material transfer arm away from the axis of the support roller. When the material transfer arm extends out of the outer periphery of the support roller, the material transfer roller can lift the pipe upward and separate the pipe from the outer wall of the support roller, so that the pipe can be rolled and transferred in a direction parallel to the axis of the support roller. The guiding component of the alternating auxiliary mechanism includes an inner shaft that is movably disposed inside the support roller along the axial direction of the support roller. The inner shaft is provided with a first guiding groove corresponding to the limiting arm and a second guiding groove corresponding to the transfer arm. The guiding directions of the first guiding groove and the second guiding groove are opposite. When the inner shaft moves along the axial direction of the support roller, the first guiding groove and the second guiding groove respectively guide the limiting arm and the transfer arm to switch in opposite directions, so that the transfer arm extends when the limiting arm retracts and the transfer arm is hidden when the limiting arm extends. The guiding component is driven by the pushing component and the turning mechanism. After the turning mechanism completes the turning action of the carrier plate, it can continue to drive the guiding component to move through the pushing component, so that the limiting component switches from the limiting state to the avoidance state, and the material transfer component switches from the hidden state to the extended support state.

2. The bimetallic composite pipe welding equipment according to claim 1, characterized in that, The pushing component includes a traction arm that is movably mounted on the carrier plate along the axial direction of the support roller. The upper end of the traction arm is rotatably connected to the inner shaft. The lower ends of the traction arms corresponding to the two support rollers on the same carrier plate are connected to a U-shaped traction frame. The pushing component also includes a drive column disposed on the incomplete gear, the drive column being used to push the U-shaped traction frame to displacement; When the incomplete gear drives the second gear and the carrier plate to rotate 180 degrees, the drive column corresponds to the U-shaped traction frame. The incomplete gear continues to rotate and can push the closed end of the U-shaped traction frame to move through the drive column.

3. The bimetallic composite pipe welding equipment according to claim 1, characterized in that, The inner wall of the support roller and the outer wall of the inner shaft are provided with corresponding convex rings, and a first elastic element is provided between the corresponding convex rings. The first elastic element is used to drive the inner shaft to reset. A second elastic element is provided between the limiting arm and the inner wall of the supporting roller. The second elastic element is used to drive the limiting arm to hide inside the supporting roller. A third elastic element is provided between the transfer arm and the inner wall of the support roller. The third elastic element is used to drive the transfer arm to reset to the inside of the support roller.

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