Welding preheating treatment device for large-diameter pipe joint

Abstract

The invention discloses a welding preheating treatment device for a large-diameter pipe joint. The welding preheating treatment device comprises a support, a heat treatment assembly and an integrated control system. The supporting seat is provided with a supporting part with adjustable supporting width so as to be suitable for pipe joints with different diameters; the supporting part comprises a rolling piece which is driven by the driving motor to drive the pipe joint to rotate. The heat treatment assembly is arranged at the welding end and comprises a heat insulation cover, a supporting frame, a flame nozzle and a flow control valve. The heat shield is of an arc-shaped structure with the adjustable curvature and is stably supported on the outer side of the welding end through a supporting frame. The flame nozzle is arranged in the heat insulation cover and externally connected with a gas pipeline, and gas supply is adjusted through the flow control valve. The integrated control system controls starting, stopping and operating power of the driving motor, automatic ignition of the flame nozzle and opening, closing and opening degree of the flow control valve in a centralized mode, and welding preheating automatic operation is achieved. The device is high in automation degree, high in processing precision, wide in applicability and safe and reliable in operation, and the comprehensive benefits of pipe joint welding preheating are improved.

Description

Technical Field

[0001] This invention relates to the field of heat treatment equipment for large components, and more particularly to a welding preheating treatment device for large-diameter pipe sections. Background Technology

[0002] As the global energy structure accelerates its transition to cleaner energy, industries such as offshore wind power and marine engineering equipment are experiencing explosive growth. As one of the core markets, China's demand for ultra-thick steel plates and ultra-large diameter pipe sections in these fields continues to rise. However, the welding of such large components still faces technical challenges such as cold cracking, hydrogen-induced defects, and residual stress concentration, requiring precise control of preheating, interpass temperature, and post-weld heat treatment processes to ensure structural performance.

[0003] Currently, the mainstream process relies on manual combustion with propane or natural gas flames, combined with manual temperature measurement. This has several drawbacks: low automation, complete reliance on worker experience, resulting in high labor intensity and low efficiency; poor temperature uniformity, as it is difficult to maintain a stable heating range manually during pipe section rotation or heater movement, easily causing local overheating or underheating, affecting processing quality; significant safety hazards, as open flame operations themselves are accompanied by the risk of gas leakage and deflagration, and the unreliability of manual monitoring methods further exacerbates on-site risks; and limited adaptability, as existing heating devices are usually only compatible with specific pipe diameters, requiring customized tooling for pipe sections of different specifications, which is costly and lacks flexibility.

[0004] Therefore, there is an urgent need to develop intelligent and high-precision welding preheating equipment to break through existing process bottlenecks, comprehensively improve the heating efficiency of flame spraying and the safety and controllability of the operation process, thereby achieving a leap in production efficiency, optimization of manpower allocation and effective reduction of carbon emissions, and providing reliable support for the sustainable development of offshore wind power and other related fields. Summary of the Invention

[0005] The main technical problem to be solved by the present invention is to provide a welding preheating treatment device for large-diameter pipe sections, so as to improve the efficiency and safety of preheating treatment operations for large-diameter pipe sections.

[0006] To solve the above-mentioned technical problems, the present invention provides a welding preheating treatment device for large-diameter pipe sections, including a support, a heat treatment assembly and an integrated control system;

[0007] The support includes a support portion for supporting the pipe section; the support portion is a movable structure to switch between different support widths; the support portion includes rolling elements that abut against the pipe section; the support is equipped with a drive motor for driving at least a portion of the rolling elements to rotate, thereby causing the pipe section to rotate about its own axis.

[0008] The heat treatment assembly is located at the welded end of the pipe section and includes a flame nozzle, a flow control valve, a heat shield, and a support frame; the support frame is connected to the heat shield and is used to support the heat shield on the outside of the welded end; the heat shield is constructed as a movable arc-shaped structure to switch between different curvatures.

[0009] The flame nozzle is located inside the heat insulation cover at least at one end facing the welding end, and the other end away from the welding end is connected to a gas pipeline; the flow control valve is located on the gas pipeline;

[0010] The integrated control system is connected to the drive motor to control the start / stop status and operating power of the drive motor; the integrated control system is also connected to the flow control valve to control the flow control valve to regulate the opening / closing status and gas flow of the gas pipeline.

[0011] In a preferred embodiment, the heat shield adopts a modular structure, including a plurality of sub-shields spliced ​​along the arc length direction of the heat shield; at least some of the adjacent sub-shields are hinged to each other.

[0012] In a preferred embodiment, the heat shield further includes a locking structure for locking or unlocking relative rotation between two adjacent hinged sub-shields.

[0013] In a preferred embodiment, the support includes two rolling elements that abut against the bottom of the pipe section; the two rolling elements are disposed on both sides of the pipe section along the axial direction; at least one of the two rolling elements has a degree of freedom of displacement relative to the other rolling element, moving closer to or further away from it.

[0014] In a preferred embodiment, a temperature sensor connected to the integrated control system is further included to detect the temperature of the welding end;

[0015] The control signals sent by the integrated control system to the drive motor or flow control valve are based at least on the data transmitted from the temperature sensor to the integrated control system.

[0016] In a preferred embodiment, a gas concentration sensor connected to the integrated control system is further included to detect the gas concentration at the welding end;

[0017] The control signal sent by the integrated control system to the flow control valve is also based on the data transmitted from the gas concentration sensor to the integrated control system.

[0018] In a preferred embodiment, the support frame includes a movable base connected to the integrated control system; the movable base moves under the control of the integrated control system.

[0019] In a preferred embodiment, the support frame extends to include at least one set of the support arms, which are configured as telescopic swing arm structures.

[0020] In a preferred embodiment, the support frame includes a lifting mechanism for adjusting the support height of the support frame.

[0021] In a preferred embodiment, the locking structure employs one or more of the following structural combinations for locking: pin engagement, meshing engagement, or snap-fit ​​engagement.

[0022] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0023] The welding preheating device for large-diameter pipe sections provided by this invention achieves continuous and stable operation from ignition, heating, temperature control to pipe section rotation through fully automated control. This significantly reduces manual labor intensity and operational risks, and greatly improves work efficiency. Secondly, its integrated control system can precisely coordinate the management of the temperature field and rotation speed, ensuring uniform heating of the pipe section circumferential seam and effectively eliminating welding stress, thereby guaranteeing stable and reliable processing quality. In terms of safety, by integrating automatic ignition, real-time gas concentration monitoring, and linkage control mechanisms, a multi-layered protection system is constructed, which can quickly identify and automatically handle safety hazards, comprehensively improving the safety and controllability of the operation process. Furthermore, the modular design and adjustable structure of the device enable it to adapt to a wide range of pipe diameters. A single unit can meet the needs of various working conditions, reducing equipment investment and inventory costs while achieving intensive energy utilization through efficient heat insulation and precise flow control, comprehensively embodying the unity of green manufacturing and economic benefits. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the welding preheating treatment device described in the embodiment of the present invention;

[0025] Figure 2 This is a front view schematic diagram of the welding preheating treatment device described in the embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the heat treatment component described in an embodiment of the present invention;

[0027] Figure 4 This is an exploded view of the structure of the heat insulation cover described in the embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the support frame described in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the integrated control system described in this embodiment of the invention.

[0030] The markings in the diagram are as follows: 1-support, 11-drive motor, 12-rolling element, 2-heat insulation cover, 21-sub-cover, 22-connecting part, 23-conventional heat insulation cover, 24-flame nozzle fixing cover, 25-sensor fixing cover, 26-locking structure, 27-partition, 28-clearance hole, 291-first connecting fixture, 292-second connecting fixture, 3-flame nozzle, 4-flow control valve, 5-support frame, 51-movable base, 52-lifting mechanism, 53-fixed seat, 54-first support arm, 541-telescopic rod, 542-connecting rod, 55-second support arm, 61-temperature sensor, 62-gas concentration sensor, 7-integrated control system, 8-pipe section, 81-welding end. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0034] like Figures 1 to 6 As shown, this embodiment of the invention provides a welding preheating treatment device for large-diameter pipe sections, including a support 1, a heat treatment assembly, and an integrated control system 7. Preferably, the device further includes a temperature sensor 61 and a gas concentration sensor 62. The specific structure and connection relationship of each part of the device will be further described below with reference to specific figures.

[0035] The support 1 is provided with a support portion for supporting the tube section 8. The support portion is a movable structure, allowing it to switch between different support widths. It should be understood that when the "movable structure" described herein is switched to a specified form, it should be temporarily fixed to have a basic working state. To ensure uniform heating during preheating, the tube section 8 needs to be rotated. For this purpose, the support portion includes rolling elements 12 abutting against the tube section 8, and the support 1 is equipped with a drive motor 1 for driving at least a portion of the rolling elements 12 to rotate, thereby causing the tube section 8 to rotate about its own axis. Unless otherwise specified, the axis of the tube section 8 referred to herein refers to its geometric center line extending along its length. The drive motor 1 is connected to the integrated control system 7. Preferably, as Figure 2 As shown, the support includes two rolling elements 12 that abut against the bottom of the pipe section 8, with the two rolling elements 12 positioned on opposite sides of the pipe section 8 along its axial direction. It is easy to understand that in this specific application example, these two rolling elements 12 simultaneously serve to support and rotate the pipe section 8. At least one of the two rolling elements 12 has a degree of displacement freedom relative to the other rolling element 12, allowing adjustment of the support span of the support according to pipe sections 8 of different diameters. Preferably, at least one rolling element 12 slides along the cross-sectional direction of the pipe section 8 on the support 1.

[0036] like Figure 3 As shown, the heat treatment assembly is located at the welded end 81 of the pipe section 8 and includes a heat shield 2, a flame nozzle 3, a flow control valve 4, and a support frame 5. The heat shield 2 is constructed as a movable arc-shaped structure to switch between different curvatures. Preferably, the heat shield 2 adopts a modular structure, including several sub-shields 21 spliced ​​along the arc length direction of the heat shield 2. Figure 4 As shown, in a specific application example, the heat shield 2 includes multiple sub-shields 21, such as a conventional heat shield 23, a flame nozzle 3 mounting cover 24, and a sensor mounting cover 25, achieving multi-functional integration. At least some adjacent sub-shields 21 are hinged to each other to change the curvature of the heat shield 2 through relative rotation between the sub-shields 21. Based on this, the heat shield 2 can be adapted for assembly with pipe sections 8 of different diameters. Preferably, two adjacent sub-shields 21 are hinged through a fan-shaped or triangular connecting part 22 to cover the gap between them when the two adjacent sub-shields 21 rotate away from each other, preventing heat loss. The variable diameter and multi-functional integration of the heat shield 2 significantly improve the versatility and efficiency of the device.

[0037] Preferably, the heat insulation cover 2 further includes a locking structure 26 for locking or unlocking the relative rotation between two adjacent hinged sub-covers 21. In a specific application example, the locking structure 26 preferably uses one or more of the following structures for locking: pin engagement, meshing engagement, or snap-fit ​​engagement. After the user adjusts the curvature of the heat insulation cover 2 to fit the pipe section 8, the locking structure 26 locks the overall shape of the heat insulation cover 2 to effectively prevent structural loosening of the heat insulation cover 2 due to vibration or external forces during operation, ensuring that it can always provide stable heat insulation.

[0038] The support frame 5 connects to the heat insulation cover 2, supporting the heat insulation cover 2 on the outside of the welded end 81 of the pipe section 8 to reduce heat loss. The heat insulation cover 2 undergoes spatial posture changes due to adjustments in its support angle, support height, or curvature; therefore, the support frame 5 has at least one of the following characteristics: the support frame 5 is hinged to the heat insulation cover 2; or, the support point of the support frame 5 supporting the heat insulation cover 2 has a degree of displacement freedom within the support plane. The support plane refers to the vertical plane where the heat insulation cover 2 is located. Figure 3 , Figure 5 A specific application example of the support frame 5 is illustrated, which provides two-point support for the heat insulation cover 2. Specifically, the support frame 5 includes a movable base 51, a fixed seat 53 connected to the movable base 51 via a set of lifting mechanisms 52, and two sets of support arms extending from the fixed seat 53. The movable base 51 is connected to the integrated control system 7 for movement under the control of the integrated control system 7. The lifting mechanism 52 is used to adjust the support height of the support frame 5. Preferably, the lifting mechanism 52 is driven by a lifting cylinder connected to the integrated control system 7. The two sets of support arms are respectively supported at different positions along the arc length of the heat insulation cover 2, and at least one set of support arms is constructed as a telescopic swing arm structure. Through the coordination of the two degrees of freedom of displacement, angle and extension length, the support point can cover and move within the support plane, thereby adapting to the spatial posture of the heat insulation cover 2. The two sets of support arms are now referred to as the first support arm 54 and the second support arm 55. Specifically, the first support arm 54 includes a telescopic rod 541 and a connecting rod 542 connecting the telescopic rod 541 and the fixed base 53. The connecting rod 542 enables the first support arm 54 to swing. The heat insulation cover 2 is provided with a first connecting fixture 291 and a second connecting fixture 292 at intervals along the arc length direction. The first support arm 54 is connected to the first connecting fixture 291 through a first connector, and the second support arm 55 is connected to the second connecting fixture 292 through a second connector. Preferably, the first connecting fixture 291 or the second connecting fixture 292 is provided with multiple connection points at intervals along the arc length direction of the heat insulation cover 2 to provide multiple support points for the support frame 5. Preferably, the first connector or the second connector is a screw or a pin.

[0039] The flame nozzle 3 is connected to the integrated control system 7 and automatically ignites under the control of the integrated control system 7. At least one end of the flame nozzle 3 facing the welding end 81 is disposed inside the heat insulation cover 2, and the end away from the welding end 81 is connected to a gas pipeline. The flow control valve 4 is disposed on the gas pipeline. Figure 3 and Figure 4 In the illustrated application example, the flame nozzle 3 is mounted on the second support arm 55, and its end facing the welding end 81 passes through the relief hole 28 on the heat insulation cover 2 and extends into the heat insulation cover 2. The flame nozzle 3 extends into the flame nozzle 3 fixing cover 24 described above. In this application example, the flow control valve 4 is also fixed to the second support arm 55.

[0040] Preferably, the device further includes a temperature sensor 61 connected to the integrated control system 7 for detecting the temperature of the welding end 81. It also includes a gas concentration sensor 62 connected to the integrated control system 7 for detecting the gas concentration at the welding end 81. Figure 3 and Figure 4 In the illustrated application example: two temperature sensors 61 are installed in sensor mounting covers 25 located at both ends of the heat insulation cover 2; one gas concentration sensor 62 is installed in any one of the sensor mounting covers 25. Furthermore, the heat insulation cover 2 is also provided with several partitions 27, which are located between the flame nozzle 3 and the aforementioned sensors to physically isolate the sensors from damage caused by heat radiation, hot airflow, or splashing impurities generated by the flame nozzle 3, providing a stable environment for the latter's high-precision operation.

[0041] Now refer to Figure 6 The automated control process of the device is described below. Preferably, the integrated control system 7 is a closed-loop control system based on a programmable logic controller or an industrial computer. When the pipe section 8 is in place, the integrated control system 7 sends a control signal to the movable base 51 of the support frame 5 to move the support frame 5 to the working position. Preferably, the integrated control system 7 also sends a control signal to the lifting mechanism 52 of the support frame 5 to adjust the height of the heat insulation cover 2 and the flame nozzle 3. The heating treatment assembly is then in place. Next, the integrated control system 7 sends a control signal to start and rotate the pipe section 8 at a preset operating power. The integrated control system 7 outputs a control signal to the flow control valve 4 to open it to a preset opening degree, and after the heat insulation cover 2 and the support frame 5 are adjusted for adaptation according to the diameter of the pipe section 8, a control signal is then sent to the flame nozzle 3 to ignite and heat the welded end 81 of the pipe section 8.

[0042] During the preheating process, the temperature sensor 61 collects the temperature information of the working area and feeds it back to the integrated control system 7 in real time. The gas concentration sensor 62 collects the gas concentration information of the working area and feeds it back to the integrated control system 7 in real time. Based on the received temperature and gas concentration information, the integrated control system 7 adjusts the operating states of the drive motor 1 and the flow control valve 4 in real time to achieve coordinated control of the rotation speed and heating temperature of the pipe section 8, ensuring uniform heating and precise temperature control. The operating state of the drive motor 1 includes its start / stop state and operating power; the operating state of the flow control valve 4 includes its open / closed state and opening degree. When the temperature or gas concentration in the working area is abnormal, the integrated control system 7 sends a control signal to the flow control valve 4 to close it, cutting off the gas supply, and sends a control signal to the drive motor 1 to shut it down. Preferably, the integrated control system 7 also triggers an audible and visual alarm device to remind the operator to intervene. This feedback mechanism significantly improves the safety and reliability of the device.

[0043] After the preheating treatment of the pipe section 8 is completed, the integrated control system 7 sends a control signal to the drive motor 1 to shut it off, and sends a control signal to the flow control valve 4 to cut off the gas supply. Then, the integrated control system 7 sends a control signal to the movable base 51 to control it to move away from the working area.

[0044] In summary, the device provided in this embodiment of the invention achieves continuous and stable operation from ignition, heating, temperature control to pipe section 8 rotation through fully automated control. This not only significantly reduces manual labor intensity and operational risks but also greatly improves work efficiency. Secondly, its integrated control system 7 can precisely coordinate and manage the temperature field and rotation speed, ensuring uniform heating of the circumferential seam of pipe section 8 and effectively eliminating welding stress, thereby guaranteeing stable and reliable processing quality. In terms of safety, by integrating automatic ignition, real-time gas concentration monitoring, and linkage control mechanisms, a multi-layered protection system is constructed, enabling rapid identification and automatic handling of safety hazards, comprehensively improving the safety and controllability of the operation process. Furthermore, the modular design and adjustable structure of the device allow for wide pipe diameter adaptability; a single unit can meet various working conditions. While reducing equipment investment and inventory costs, it achieves intensive energy utilization through efficient heat insulation and precise flow control, comprehensively embodying the unity of green manufacturing and economic benefits.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the patent scope of the present invention. Any technically equivalent modifications made based on the content of this specification shall fall within the protection scope of the present invention.

Claims

1. A welding preheating treatment device for large-diameter pipe sections, characterized in that: Includes supports, heat treatment components, and an integrated control system; The support includes a support portion for supporting the pipe section; the support portion is a movable structure to switch between different support widths; the support portion includes a rolling element that abuts against the pipe section; The support is equipped with a drive motor to drive at least a portion of the rolling elements to rotate, thereby causing the pipe section to rotate around its own axis; The heat treatment assembly is located at the welded end of the pipe section and includes a flame nozzle, a flow control valve, a heat shield, and a support frame; the support frame is connected to the heat shield and is used to support the heat shield on the outside of the welded end; the heat shield is constructed as a movable arc-shaped structure to switch between different curvatures. The flame nozzle is located inside the heat insulation cover at least at one end facing the welding end, and the other end away from the welding end is connected to a gas pipeline; the flow control valve is located on the gas pipeline; The integrated control system is connected to the drive motor to control the start / stop state and operating power of the drive motor; the integrated control system is connected to the flame nozzle to at least control the ignition of the flame nozzle; the integrated control system is also connected to the flow control valve to control the opening / closing state and opening degree of the flow control valve.

2. The welding preheating treatment device for large-diameter pipe sections according to claim 1, characterized in that: The heat insulation cover adopts a modular structure, including several sub-covers spliced ​​along the arc length direction of the heat insulation cover; at least some of the adjacent sub-covers are hinged to each other.

3. The welding preheating treatment device for large-diameter pipe sections according to claim 2, characterized in that... : Relative rotation between two adjacent sub-covers that are hinged together to lock or unlock them.

4. The welding preheating treatment device for large-diameter pipe sections according to claim 1, characterized in that... The support includes two rolling elements that abut against the bottom of the pipe section; the two rolling elements are respectively disposed on both sides of the pipe section along the axial direction; at least one of the two rolling elements has a degree of freedom of displacement relative to the other rolling element, moving closer or further away.

5. The welding preheating treatment device for large-diameter pipe sections according to claim 1, characterized in that: It also includes a temperature sensor connected to the integrated control system for detecting the temperature of the welding end; The control signals sent by the integrated control system to the drive motor or flow control valve are based at least on the data transmitted from the temperature sensor to the integrated control system.

6. The welding preheating treatment device for large-diameter pipe sections according to claim 5, characterized in that: It also includes a gas concentration sensor connected to the integrated control system for detecting the gas concentration at the welding end; The control signal sent by the integrated control system to the flow control valve is also based on the data transmitted from the gas concentration sensor to the integrated control system.

7. The welding preheating treatment device for large-diameter pipe sections according to claim 1, characterized in that... The support frame includes a movable base connected to the integrated control system; the movable base moves under the control of the integrated control system.

8. The welding preheating treatment device for large-diameter pipe sections according to claim 1, characterized in that... The support frame extends with two sets of support arms; at least one set of support arms is constructed as a telescopic swing arm structure.

9. A welding preheating treatment apparatus for large-diameter pipe sections according to any one of claims 1 or 8, characterized in that... The support frame includes a lifting mechanism for adjusting the support height of the support frame.

10. A welding preheating treatment device for large-diameter pipe sections according to claim 3, characterized in that... The locking structure employs one or more of the following structures for locking: pin engagement, meshing engagement, or snap-fit ​​engagement.

Images