A chemical pipeline welding fixture
By introducing a combination design of propulsion cylinder, positioning cone and clamping mechanism into the welding fixture for chemical pipelines, the problem of positioning deviation in chemical pipeline welding was solved, and high-quality pipeline docking and welding results were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Nantong Huaxing Chemical Engineering Construction Co Ltd
- Filing Date
- 2025-07-28
- Publication Date
- 2026-06-30
AI Technical Summary
Existing welding fixtures for chemical pipelines are insufficient to guarantee positioning accuracy when dealing with complex working conditions, resulting in inaccurate pipeline connections and affecting welding quality.
The system employs a welding fixture that includes a frame, pipe support bracket, clamping mechanism, and positioning mechanism. A propulsion cylinder drives the positioning push plate and positioning cone to insert into the inner diameter of the pipe. Combined with the clamping operation of the clamping mechanism, this ensures a tight fit between the pipe and the system. Real-time monitoring and stable support are achieved through an arc-shaped pad and a detection plate.
It improves the accuracy of pipe docking and positioning, ensures welding quality, prevents pipe displacement, enhances the stability and precision of welding, and avoids deformation or damage caused by local stress concentration.
Smart Images
Figure CN224424795U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of pipeline welding equipment technology, and in particular to a welding fixture for chemical pipelines. Background Technology
[0002] In the chemical industry, pipeline systems are the core facilities for transporting various chemical media (such as gases, liquids, slurries, etc.). As a key part of pipeline installation, chemical pipeline welding not only needs to ensure that the connection strength between pipelines meets the design requirements and can withstand the pressure and temperature changes of the internal medium and various forces of the external environment, but also needs to ensure the sealing of the welded joints to prevent chemical media leakage and avoid serious consequences such as safety accidents, environmental pollution, and resource waste.
[0003] In related technologies, it is difficult to ensure the accuracy of positioning when dealing with the complex working conditions of chemical pipeline welding. Some existing welding fixtures are prone to positioning deviations when positioning pipelines due to unreasonable structural design, resulting in inaccurate pipeline docking and affecting welding quality. Therefore, improvements are needed. Utility Model Content
[0004] To address the problem of difficulty in locating chemical pipelines, this application provides a welding fixture for chemical pipelines.
[0005] The technical solution for a chemical pipeline welding fixture provided in this application is as follows:
[0006] A welding fixture for chemical pipelines includes a frame with two pipe support brackets arranged opposite each other on the frame. A clamping mechanism is provided on the frame for each pipe support bracket. Positioning mechanisms are provided on both sides of the frame. Each positioning mechanism includes a propulsion cylinder, a positioning push plate, and a positioning cone. The propulsion cylinder is connected to the frame, the positioning push plate is connected to the output end of the propulsion cylinder, and the positioning cone is connected to the positioning push plate. The positioning cone is inserted into the inner diameter of the pipe for radial positioning.
[0007] Due to the difficulty in ensuring positioning accuracy when dealing with complex welding conditions of chemical pipelines, some existing welding fixtures are prone to positioning deviations when positioning pipelines due to unreasonable structural design, resulting in inaccurate pipeline connection and affecting welding quality. By adopting the above technical solution, including a frame, two pipe seat brackets are installed opposite each other on the frame, a clamping mechanism cooperates with the pipe seat brackets, and a positioning mechanism is installed on both sides of the frame. The positioning mechanism includes a propulsion cylinder, a positioning push plate, and a positioning cone.
[0008] Before welding the pipeline, lifting equipment such as slings is used to hoist the chemical pipeline onto the corresponding pipe support bracket. The clamping mechanism is then activated, but it does not actually clamp the pipeline at this stage. Instead, its position is adjusted to restrict the free movement of the pipeline on the pipe support bracket. The propulsion cylinders in the positioning mechanisms on both sides of the frame are then activated. The propulsion cylinders begin to work, and their output ends push the positioning push plate forward. The positioning push plate drives the positioning cone head to move towards the pipeline. As the propulsion cylinders continue to push, the positioning cone head gradually inserts into the inner diameter of the pipeline. Once the positioning cone is fully inserted into the predetermined position, there may still be a certain gap between the two pipes. However, the propulsion cylinder does not stop working and continues to apply thrust. The propulsion cylinder transmits the force to the pipes through the positioning push plate and the positioning cone, pushing the two pipes to be welded to move slowly toward each other until the ends of the two pipes are tightly fitted together, completely eliminating the gap. The propulsion cylinder then stops working. After confirming that the two pipes are accurately positioned, the clamping mechanism is operated again. According to the specifications and dimensions of the pipes, the clamping force and position of the clamping mechanism are adjusted so that the clamping mechanism can firmly clamp the pipes.
[0009] By incorporating a pipe seat bracket, clamping mechanism, and positioning mechanism, the positioning deviation problem caused by the unreasonable structural design of existing welding fixtures is effectively solved. During welding preparation, the positioning mechanism can accurately insert the positioning cone into the inner diameter of the pipe and continuously push the pipe to fit tightly, completely eliminating gaps. Combined with the firm clamping of the clamping mechanism, the accuracy of pipe docking positioning is improved, providing a reliable guarantee for high-quality welding.
[0010] Optionally, the clamping mechanism includes a clamping seat, a clamping cylinder, and a pressing arc plate. The clamping seat is arranged on the frame, the clamping cylinder is vertically arranged on the clamping seat, and the pressing arc plate is connected to the output end of the clamping cylinder. The pressing arc plate cooperates with the pipe seat bracket to clamp the pipe.
[0011] By adopting the above technical solution, the clamping mechanism includes a clamping seat, a clamping cylinder, and a pressing arc plate. In the initial state, the pressing arc plate is in a high position, leaving sufficient space between it and the pipe seat bracket for placing the pipe. When the pipe is initially positioned, the clamping cylinder is activated, and its output end pushes the pressing arc plate downward, so that the pressing arc plate contacts the outer wall of the pipe. At this time, the clamping cylinder works with a small pressure or a short stroke, and the pressing arc plate only provides a light clamping force, which, together with the pipe seat bracket, restricts the free movement of the pipe. After the two pipe ends are tightly fitted and accurately positioned, the clamping cylinder further increases the output pressure or extends the stroke, pushing the pressing arc plate to press tightly against the outer wall of the pipe, and the pressing arc plate cooperates with the pipe seat bracket. Through the setting of the clamping mechanism, the clamping mechanism can achieve stable support and fixation, ensure the reliability of the clamping operation, firmly clamp the pipe, prevent the pipe from shifting due to external force or vibration during the welding process, improve the accuracy and quality of pipe welding, and ensure the stability of chemical pipeline welding operations.
[0012] Optionally, the pipe seat bracket is provided with an arc-shaped liner, the radius of curvature of which matches the outer diameter of the pipe.
[0013] By adopting the above technical solution, the arc-shaped gasket is installed on the pipe seat bracket; the arc-shaped gasket increases the contact area between the pipe and the pipe seat bracket, effectively dispersing the pressure on the pipe and avoiding local stress concentration that could lead to pipe deformation or damage.
[0014] Optionally, the arc-shaped pad contact surface is provided with a relief groove to reduce contact stress.
[0015] By adopting the above technical solution, the clearance groove is opened on the contact surface of the arc-shaped gasket; by setting the clearance groove, the clearance groove effectively disperses the pressure at the contact point between the pipeline and the arc-shaped gasket, avoids excessive local stress concentration, and further reduces the risk of deformation or damage to the pipeline caused by uneven stress.
[0016] Optionally, a detection plate is provided on the pipe support bracket, and a displacement sensor is provided on the side of the detection plate facing the pipe.
[0017] By adopting the above technical solution, the detection plate is installed on the pipe support bracket, and the displacement sensor is installed on the detection plate. Through the setting of the detection plate and the displacement sensor, real-time and accurate monitoring of the pipeline position status is realized. The displacement sensor can keenly capture the minute displacement changes generated by the pipeline during welding preparation and welding process, so that operators can quickly grasp the dynamic status of the pipeline.
[0018] Optionally, the frame is provided with an adjustment base plate, and the two tube seat brackets and two sets of clamping mechanisms are all mounted on the adjustment base plate. The adjustment base plate has multiple sets of spacing adjustment holes.
[0019] By adopting the above technical solution, the two pipe seat brackets and two sets of clamping mechanisms are all installed on the adjustment base plate and fixed in the corresponding spacing adjustment holes by bolts. By setting the adjustment base plate and the spacing adjustment holes, the flexibility and adaptability of the welding fixture are improved. The installation position of the pipe seat brackets and clamping mechanisms on the adjustment base plate can be flexibly adjusted according to the actual length of different specifications of chemical pipelines and welding requirements, so as to ensure that the pipeline can be stably supported and accurately clamped.
[0020] Optionally, each of the propulsion cylinders is provided with a positioning seat for installation, the positioning seat is connected to the frame, and the positioning seat is provided with stiffening plates on both sides.
[0021] By adopting the above technical solution, the propulsion cylinder is mounted on the frame via a positioning seat, and stiffening plates are welded on both sides of the positioning seat. Through the setting of the positioning seat and stiffening plates, the positioning seat provides a stable mounting base for the propulsion cylinder, ensuring its precise connection with the frame, while the stiffening plates strengthen the structural rigidity, effectively disperse the reaction force generated when the propulsion cylinder is working, and extend its service life.
[0022] Optionally, the positioning push plate is provided with a guide rod, and the positioning seat is provided with a guide hole for the guide rod to pass through.
[0023] By adopting the above technical solution, the guide rod is installed on the positioning push plate, and a guide hole is opened on the positioning seat. The guide rod slides in the guide hole of the positioning seat. The setting of the guide rod and the guide hole provides a guiding mechanism for the movement of the positioning push plate driven by the propulsion cylinder. When the propulsion cylinder pushes the positioning push plate to move, the guide rod slides in a straight line along the guide hole, which effectively constrains the movement trajectory of the positioning push plate and avoids deviation or shaking caused by uneven cylinder thrust or external interference. This ensures that the positioning push plate always moves smoothly and accurately in the predetermined direction, thereby improving the accuracy of pipeline positioning.
[0024] In summary, this application includes at least one of the following beneficial technical effects:
[0025] 1. By setting up the pipe seat bracket, clamping mechanism and positioning mechanism, the positioning deviation problem caused by the unreasonable structural design of the existing welding tooling is effectively solved. During the preparation before welding, the positioning mechanism can accurately insert the positioning cone into the inner diameter of the pipe and continuously push the pipe to fit tightly, completely eliminating gaps. Combined with the firm clamping of the clamping mechanism, the accuracy of pipe docking positioning is improved, providing a reliable guarantee for high-quality welding.
[0026] 2. Through the setting of the clamping mechanism, the clamping mechanism can achieve stable support and fixation, ensure the reliability of clamping operation, firmly clamp the pipeline, prevent the pipeline from shifting due to external force or vibration during the welding process, improve the accuracy and quality of pipeline welding, and ensure the stability of chemical pipeline welding operations;
[0027] 3. The arc-shaped gasket increases the contact area between the pipe and the pipe support bracket, effectively dispersing the pressure on the pipe and avoiding local stress concentration that could lead to pipe deformation or damage. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the structure of a chemical pipeline welding fixture in an embodiment of this application.
[0029] Figure 2 This is a structural schematic diagram illustrating the tube seat bracket and clamping mechanism in the embodiments of this application.
[0030] Figure 3This is a rear view of a chemical pipeline welding fixture in an embodiment of this application.
[0031] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Pipe support bracket; 3. Clamping mechanism; 31. Clamping seat; 32. Clamping cylinder; 33. Pressing arc plate; 4. Positioning mechanism; 41. Pushing cylinder; 42. Positioning push plate; 43. Positioning cone; 5. Arc-shaped liner; 6. Clearance groove; 7. Detection plate; 8. Displacement sensor; 9. Adjustment base plate; 91. Spacing adjustment hole; 10. Positioning seat; 101. Rib plate; 11. Guide rod; 12. Guide hole. Detailed Implementation
[0032] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.
[0033] This application discloses a welding fixture for chemical pipelines. (Refer to...) Figure 1 The chemical pipeline welding fixture includes a frame 1, on which two pipe seat brackets 2 are mounted opposite each other. In this embodiment, the two pipe seat brackets 2 correspond to two pipes to be welded. The pipe seat brackets 2 are used to place the pipes. The number of pipe seat brackets 2 can be increased according to the length of the pipes. A clamping mechanism 3 is installed on the frame 1 for each pipe seat bracket 2. The clamping mechanism 3 is used to fix the pipes. At the same time, positioning mechanisms 4 are installed on both sides of the frame 1. The positioning mechanisms 4 are used to position the pipes.
[0034] Reference Figure 1 An adjustment base plate 9 is installed on the frame 1. The two pipe seat brackets 2 and the clamping mechanism 3 are all installed on the adjustment base plate 9. The adjustment base plate 9 has multiple sets of spacing adjustment holes 91. The pipe seat brackets 2 and the clamping mechanism 3 can be fixedly installed in the corresponding spacing adjustment holes 91 by bolts to improve the flexibility and adaptability of the welding fixture. The installation position of the pipe seat brackets 2 and the clamping mechanism 3 on the adjustment base plate 9 can be flexibly adjusted according to the actual length of different specifications of chemical pipelines and welding requirements to ensure that the pipeline can be stably supported and accurately clamped.
[0035] Reference Figure 1 and Figure 2 An arc-shaped gasket 5 is installed on the pipe seat bracket 2. The arc-shaped gasket 5 is detachably installed on the pipe seat bracket 2. The radius of curvature of the arc-shaped gasket 5 matches the outer diameter of the pipe. The arc-shaped gasket 5 increases the contact area between the pipe and the pipe seat bracket 2, effectively dispersing the pressure on the pipe and avoiding local stress concentration that could lead to pipe deformation or damage.
[0036] Reference Figure 1 and Figure 2The contact surface of the arc-shaped gasket 5 is provided with a relief groove 6. The relief groove 6 effectively disperses the pressure at the contact point between the pipe and the arc-shaped gasket 5, avoids excessive local stress concentration, and further reduces the risk of deformation or damage to the pipe caused by uneven stress.
[0037] Reference Figure 1 and Figure 2 A detection plate 7 is installed on the pipe support bracket 2. The detection plate 7 is L-shaped, and a displacement sensor 8 is installed on the side of the detection plate 7 facing the pipe. This enables real-time and accurate monitoring of the pipe's position and status. The displacement sensor 8 can keenly capture the minute displacement changes that occur in the pipe during welding preparation and welding, allowing operators to quickly grasp the dynamic status of the pipe.
[0038] Reference Figure 1 and Figure 2 The clamping mechanism 3 includes a clamping seat 31, a clamping cylinder 32, and a pressing arc plate 33. The clamping seat 31 is arranged on the adjusting base plate 9. In this embodiment, the clamping seat 31 can be fixed to the adjusting base plate 9 by bolts. The clamping cylinder 32 is installed on the clamping seat 31 and is arranged vertically. The pressing arc plate 33 is connected to the output end of the clamping cylinder 32. The pressing arc plate 33 cooperates with the pipe seat bracket 2 to clamp the pipe. In this embodiment, the pressing arc plate 33 can be replaced according to the pipe specifications. The clamping mechanism 3 can achieve stable support and fixation, ensure the reliability of the clamping operation, firmly clamp the pipe, prevent the pipe from shifting due to external force or vibration during the welding process, improve the accuracy and quality of pipe welding, and ensure the stability of chemical pipeline welding operations.
[0039] Reference Figure 1 and Figure 3 A positioning seat 10 is installed on the frame 1. The positioning seat 10 is fixed to the frame 1 by bolts. Ribs 101 are welded and fixed on both sides of the positioning seat 10. The positioning mechanism 4 is installed on the positioning seat 10. The positioning seat 10 provides a stable mounting base for the positioning mechanism 4, ensuring that it is accurately connected to the frame 1. The ribs 101 strengthen the structural rigidity and extend the service life.
[0040] Reference Figure 1 The positioning mechanism 4 includes a propulsion cylinder 41, a positioning push plate 42, and a positioning cone 43. The propulsion cylinder 41 is mounted on the positioning seat 10 and is arranged towards the pipe seat bracket 2. The positioning push plate 42 is mounted on the piston end of the propulsion cylinder 41. The positioning cone 43 is detachably mounted on the positioning push plate 42. The positioning cone 43 is inserted into the inner diameter of the pipe for radial positioning. In this embodiment, the specifications of the positioning cone 43 are adapted to the inner diameter of the pipe. If the pipe port has a special small opening structure such as a constriction or narrow opening, the matching positioning cone 43 is further selected based on the actual size of the small opening of the port to ensure that the cone can be accurately inserted and achieve reliable radial positioning.
[0041] Reference Figure 1 Each positioning push plate 42 is equipped with a guide rod 11, which runs in the same direction as the propulsion cylinder 41. A guide hole 12 is provided through the positioning seat 10, through which the guide rod 11 passes and cooperates with the guide hole 12. The diameter of the guide hole 12 is larger than the outer diameter of the guide rod 11. In this embodiment, each positioning push plate 42 is equipped with two guide rods 11, which provide a guiding mechanism for the propulsion cylinder 41 to drive the movement of the positioning push plate 42. When the propulsion cylinder 41 pushes the positioning push plate 42 to move, the guide rod 11 slides along the straight line of the guide hole 12, which effectively constrains the movement trajectory of the positioning push plate 42 and avoids deviation or shaking caused by uneven cylinder thrust or external interference. This ensures that the positioning push plate 42 always moves smoothly and accurately in the predetermined direction, improving the accuracy of pipeline positioning.
[0042] The implementation principle of a chemical pipeline welding fixture in this application embodiment is as follows: When preparing for pipeline welding, the chemical pipeline is lifted onto the corresponding pipe support bracket 2 using lifting slings or other lifting equipment. The clamping mechanism 3 is activated, but at this time, the clamping mechanism 3 does not actually perform a clamping operation. Instead, it adjusts the position of the clamping mechanism 3 to restrict the free movement of the pipeline on the pipe support bracket 2. The propulsion cylinders 41 in the positioning mechanisms 4 on both sides of the frame 1 are activated respectively. The propulsion cylinders 41 start working, and their output ends push the positioning push plate 42 forward. The positioning push plate 42 drives the positioning cone 43 to move towards the pipeline. With the continuous push of the propulsion cylinders 41, the positioning cone 43 moves towards the pipeline. The positioning cone 43 is gradually inserted into the inner diameter of the pipe. When the positioning cone 43 is fully inserted into the predetermined position, there may still be a certain gap between the two pipes. However, the push cylinder 41 does not stop working. The push cylinder 41 continues to apply thrust, and the force is transmitted to the pipe through the positioning push plate 42 and the positioning cone 43, pushing the two pipes to be welded to move slowly towards each other until the ends of the two pipes are tightly fitted and the gap is completely eliminated. The push cylinder 41 stops working. After confirming that the two pipes are accurately positioned, the clamping mechanism 3 is operated again. According to the specifications and dimensions of the pipes, the clamping force and position of the clamping mechanism 3 are adjusted so that the clamping mechanism 3 can firmly clamp the pipes.
[0043] By setting up the pipe seat bracket 2, clamping mechanism 3 and positioning mechanism 4, the positioning deviation problem caused by the unreasonable structural design of the existing welding fixture is effectively solved. During the preparation before welding, the positioning mechanism 4 can accurately insert the positioning cone 43 into the inner diameter of the pipe and continuously push the pipe to fit tightly, completely eliminating gaps. Combined with the firm clamping of the clamping mechanism 3, the accuracy of pipe docking positioning is improved, providing a reliable guarantee for high-quality welding.
[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A chemical pipeline welding tool, characterized by: The device includes a frame on which two pipe seat brackets are arranged opposite each other. A clamping mechanism is provided on the frame for each pipe seat bracket. Positioning mechanisms are provided on both sides of the frame. Each positioning mechanism includes a propulsion cylinder, a positioning push plate, and a positioning cone. The propulsion cylinder is connected to the frame, the positioning push plate is connected to the output end of the propulsion cylinder, and the positioning cone is connected to the positioning push plate. The positioning cone is inserted into the inner diameter of the pipe for radial positioning.
2. The chemical pipeline welding fixture according to claim 1, characterized in that: The clamping mechanism includes a clamping seat, a clamping cylinder, and a pressing arc plate. The clamping seat is arranged on the frame, the clamping cylinder is vertically arranged on the clamping seat, and the pressing arc plate is connected to the output end of the clamping cylinder. The pressing arc plate cooperates with the pipe seat bracket to clamp the pipe.
3. The chemical pipeline welding fixture according to claim 1, characterized in that: The pipe support bracket is provided with an arc-shaped liner, the radius of curvature of which matches the outer diameter of the pipe.
4. The chemical pipeline welding fixture according to claim 3, characterized in that: The arc-shaped liner has a relief groove on its contact surface to reduce contact stress.
5. The chemical pipeline welding fixture according to claim 3, characterized in that: A detection plate is installed on the pipe support bracket, and a displacement sensor is installed on the side of the detection plate facing the pipe.
6. The chemical pipeline welding fixture according to claim 1, characterized in that: An adjustment base plate is provided on the frame, and the two tube seat brackets and two sets of clamping mechanisms are all mounted on the adjustment base plate. The adjustment base plate has multiple sets of spacing adjustment holes.
7. The chemical pipeline welding fixture according to claim 1, characterized in that: Each of the aforementioned propulsion cylinders is provided with a positioning seat for installation, the positioning seat being connected to the frame, and the positioning seat having stiffening plates on both sides.
8. The chemical pipeline welding fixture according to claim 7, characterized in that: The positioning push plate is provided with a guide rod, and the positioning seat is provided with a guide hole for the guide rod to pass through.