Pipeline welding alignment auxiliary device and correcting method

Abstract

The invention discloses a pipeline welding alignment auxiliary device and a correction method, and the device comprises a support, the middle part of which is provided with a through hole for a to-be-welded pipeline to pass through; the telescopic pressing structure comprises a plurality of telescopic pressing rods which are evenly arranged on the support at intervals in the circumferential direction, each telescopic pressing rod is provided with a linear telescopic end and a driven end, the extension lines of the linear telescopic ends of the telescopic pressing rods intersect at the same point, and the tail ends of the linear telescopic ends of the telescopic pressing rods are located on the same arc line; and the driving structure is connected with the driven end of each telescopic pressing rod and is used for driving each telescopic pressing rod to perform synchronous telescopic action. According to the device, the ellipticity of a to-be-welded pipeline can be effectively adjusted through the synchronous telescopic action of all the telescopic pressing rods, so that a pipe opening is restored to be in a state close to a circle, it is ensured that welding seams can be smoother and more attached during butt joint, the phenomenon of staggered joints is reduced, the pipe opening of the to-be-welded pipeline tends to be in a regular circle, and the requirement for butt welding is met.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline welding, and particularly relates to a pipeline welding butt joint auxiliary device and a correction method. Background Art

[0002] Large-diameter thin-walled pipelines are widely used in the fields of electric power, petrochemical industry, heat supply, etc., and are particularly suitable for scenarios with relatively low medium temperature and pressure and large throughput. During the installation of such pipelines, there is a large amount of docking and butt joint work. Due to the characteristics of large pipeline diameter and small wall thickness, affected by production and processing technology and transportation conditions, the situation of large pipe orifice ovality is common, which has a great impact on pipeline welding butt joint and is extremely likely to cause defects such as weld misalignment, incomplete penetration, and cracks.

[0003] Currently, during the welding construction process, welders often use methods such as flame heating, hinge hard pulling, and hammering to perform forced butt joint on the pipelines to be welded. However, the existing large pipeline butt joint methods cannot effectively solve the problem of non-circular pipeline interfaces. After welding, there are still defects such as weld misalignment, which have a great impact on the weld quality and strength. Summary of the Invention

[0004] In view of this, the present invention provides a pipeline welding butt joint auxiliary device and a correction method to solve the problem that the existing large pipeline butt joint methods cannot effectively solve the problem of non-circular pipeline interfaces, so that the two pipe orifices to be paired are both regular circles, reducing the generation of defects during welding, and the weld formation can meet the weld quality requirements after welding.

[0005] In the first aspect, the present invention provides a pipeline welding butt joint auxiliary device, including:

[0006] A bracket, a through hole for the pipeline to be welded to pass through is provided in the middle of the bracket;

[0007] A telescopic pressing structure, the telescopic pressing structure includes a plurality of telescopic pressing rods evenly arranged at intervals along the circumferential direction on the bracket, the telescopic pressing rods have a linear telescopic end and a driven end, the extension lines of the linear telescopic ends of the telescopic pressing rods intersect at the same point, and the ends of the linear telescopic ends of the telescopic pressing rods are located on the same circular arc line;

[0008] A driving structure, the driving structure is connected to the driven end of each telescopic pressing rod and is used to drive each telescopic pressing rod to perform synchronous telescopic actions.

[0009] The beneficial effects of the above pipeline welding butt joint auxiliary device are as follows: Through the synchronous telescopic movement of each telescopic pressing rod, the ovality of the pipeline to be welded can be effectively adjusted, making the pipe orifice return to a nearly circular state, which helps to ensure that the weld seams can be more flat and fitting during butt joint, reducing the phenomenon of misalignment. Since the shape of the interface has been optimized, it is easier to achieve uniform penetration during the welding process, thereby reducing the occurrence probability of welding defects such as incomplete penetration and cracks. Compared with traditional methods such as flame heating, hinge hard pulling, and hammering, this device adjusts the butt joint through mechanical automation, with simpler and faster operation, reducing manual intervention and complex manual adjustment steps.

[0010] In an alternative embodiment, the bracket is connected into a complete circular structure through two semi-circular brackets, and the two semi-circular brackets are connected through an embedded joint.

[0011] In an alternative embodiment, the semi-circular brackets are divided into an inner semi-circular bracket and an outer semi-circular bracket. The inner semi-circular bracket and the outer semi-circular bracket are arranged concentrically and are connected by bolts.

[0012] In an alternative embodiment, the driving structure is arranged between the areas formed by the inner semi-circular bracket and the outer semi-circular bracket, making the arrangement of the driving structure more reasonable and not occupying extra space.

[0013] In an alternative embodiment, the telescopic pressing rod movably passes through the bracket, and at least one row of meshing teeth is arranged on the side wall of the telescopic pressing rod, and the meshing teeth are the driven ends.

[0014] In an alternative embodiment, the driving structure includes:

[0015] A plurality of gears, each of which meshes with the meshing teeth on a telescopic pressing rod;

[0016] A gear driving assembly for driving each gear to rotate synchronously.

[0017] In an alternative embodiment, the gear driving assembly includes:

[0018] A plurality of driving motors, each of which is respectively connected to a gear;

[0019] A synchronous switch control circuit for driving each driving motor to run synchronously.

[0020] In an alternative embodiment, it further includes:

[0021] High-frequency induction heater, the high-frequency induction heater is arranged on the bracket or is separately arranged from the bracket, and the high-frequency induction heater is arranged in a ring shape so that the pipeline to be welded can pass through the middle of the high-frequency induction heater;

[0022] High-frequency power controller, the high-frequency power controller is connected to the high-frequency induction heater and is used to control the high-frequency induction heater.

[0023] The beneficial effects of the above technical solutions are as follows: Through the high-frequency induction heater and each telescopic pressing rod, the roundness of the pipe orifice can be quickly corrected, which is convenient for the welding work to be carried out and reduces the generation of welding defects. When the wall thickness of the pipeline to be welded is relatively thin or the ovality is relatively small, the operator only needs to fix the device at the position of the pipe orifice with a larger ovality, and use the synchronous switch of the control gear to adjust the telescopic amount of the telescopic pressing rod to make the pipe orifice tend to be circular. When the ovality of the pipe orifice of the pipeline to be welded is relatively large or the wall thickness is relatively thick, use the high-frequency induction heater to heat the position to be adjusted, and use the pipeline welding butt joint auxiliary device to adjust it under the hot state of the pipeline.

[0024] In an optional embodiment, the pipeline welding butt joint auxiliary device is applied to the welding butt joint correction of large-diameter thin-walled pipelines.

[0025] In a second aspect, the present invention provides a method for correcting the welding butt joint of a pipeline, including the following steps:

[0026] S1. Clamp the pipeline welding butt joint auxiliary device at the orifice position of the pipeline to be welded; simultaneously control the linear telescopic ends of each telescopic pressing rod to extend through the driving structure until each telescopic pressing rod can completely contact the outer wall of the pipeline to be welded;

[0027] S2. Keep each telescopic pressing rod in a state of pressing against the outer wall of the pipeline to be welded, and correct the welding butt joint of the pipeline to be welded.

[0028] The beneficial effects of the above method for correcting the welding butt joint of a pipeline are the same as those of the above pipeline welding butt joint auxiliary device, and will not be elaborated here.

[0029] In an optional embodiment, before performing step S1, it further includes the step of assembling the high-frequency induction heater and heating the orifice position of the pipeline.

[0030] In summary, the technical solution of the present invention has the following advantages:

[0031] The present invention makes the orifice of the pipeline to be welded tend to be a regular circle by using the pipeline roundness correction device and the heating auxiliary method, so as to meet the requirements of the welding butt joint.

[0032] When the wall thickness of the pipeline to be welded is relatively thin or the ovality is relatively small, the operator only needs to fix the device at the pipe orifice with a larger ovality, and use the synchronous switch of the control gear to adjust the telescopic amount of the telescopic pressing rod to make the pipe orifice tend to be circular. When the ovality of the pipe orifice of the pipeline to be welded is relatively large or the wall thickness is relatively thick, use a high-frequency induction heater to heat the position to be adjusted, and use the pipeline welding butt joint auxiliary device to make adjustments under the hot state of the pipeline.

[0033] Using the above-mentioned pipeline welding butt joint auxiliary device, the pipe orifice correction work can be quickly completed, improving the efficiency.

[0034] Using the above-mentioned pipeline welding butt joint auxiliary device, only 2 operators are required to cooperate to complete it smoothly, saving labor costs.

[0035] Since the welding quality is improved, the number of reworks caused by weld defects is reduced, and the maintenance cost is lowered. Description of the Drawings

[0036] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 Schematic structural diagram of a pipeline welding butt joint auxiliary device provided by the invention;

[0038] Figure 2 Schematic structural diagram of the high-frequency induction heater of a pipeline welding butt joint auxiliary device provided by the invention;

[0039] Figure 3 Schematic structural diagram of the embedded joint of a pipeline welding butt joint auxiliary device provided by the invention.

[0040] Description of the reference numerals:

[0041] 1. Bracket, 11. Semi-circular bracket, 2. Gear, 3. Telescopic pressing rod, 4. Embedded joint, 5. High-frequency induction heater. Specific Embodiments

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] The specific embodiments of the present invention will be elaborated in detail below in combination with the pipe welding butt joint auxiliary device in the first aspect of the present invention and the pipe welding butt joint correction method in the second aspect of the present invention.

[0044] According to an embodiment of the present invention, in a first aspect, there is provided a pipe welding butt joint auxiliary device, as shown in combination with Figures 1 to 3 the figure, which includes a bracket 1, a telescopic pressing structure, and a driving structure. A through hole for the pipe to be welded to pass through is provided in the middle of the bracket 1. The telescopic pressing structure includes a plurality of telescopic pressing rods 3 evenly arranged at intervals along the circumferential direction on the bracket 1. The telescopic pressing rods 3 have a linear telescopic end and a driven end. The extension lines of the linear telescopic ends of the telescopic pressing rods 3 intersect at the same point, and the ends of the linear telescopic ends of the telescopic pressing rods 3 are located on the same circular arc line. The driving structure is connected to the driven ends of the telescopic pressing rods 3 and is used to drive the telescopic pressing rods 3 to perform synchronous telescopic actions. When the driving structure drives the telescopic pressing rods 3 to synchronously extend and abut against the wall surface of the pipe to be welded, the telescopic pressing rods 3 adjust the pipe to be welded to a circular state, thereby effectively reducing the ovality of the pipe to be welded.

[0045] For the above pipe welding butt joint auxiliary device, through the synchronous telescopic actions of the telescopic pressing rods 3, the ovality of the pipe to be welded can be effectively adjusted, and the pipe orifice can be restored to a state close to a circle, which helps to ensure that the weld seams can be more flat and fitting during butt joint, and reduce the misalignment phenomenon. Since the interface shape is optimized, it is easier to achieve uniform penetration during the welding process, thereby reducing the occurrence probability of welding defects such as incomplete penetration and cracks. Compared with traditional methods such as flame heating, hinge hard pulling, and hammering, this device adjusts the butt joint through a mechanical automation method, with simpler and faster operation, reducing manual intervention and complex manual adjustment steps.

[0046] For the existing butt joint methods, multiple people are required to complete them together. Due to site limitations at the construction site, sometimes additional structures such as steel frames need to be added to assist in the pipe orifice correction work, resulting in a longer construction period. By using the above pipe welding butt joint auxiliary device, the pipe orifice correction work can be quickly completed, improving the efficiency.

[0047] For the existing butt joint methods, 3 - 5 personnel are required to work together, and the operation time is long. By using the above pipe welding butt joint auxiliary device, only 2 operators are required to cooperate to complete it smoothly, saving labor costs.

[0048] Due to the improved welding quality, the number of reworks caused by weld defects has been reduced, and the maintenance cost has been lowered.

[0049] In some embodiments, the bracket 1 is connected into a whole circular structure through two semi-circular brackets 11, and the two semi-circular brackets 11 are connected through an embedded joint 4. As shown in combination Figure 3 One of the semi-circular brackets 11 is provided with a dovetail-shaped embedded joint 4, and the other semi-circular bracket 11 is provided with a dovetail groove. The dovetail-shaped embedded joint 4 can be snap-fitted into the dovetail groove. Additionally, the embedded joint 4 can also adopt other structural forms, and its specific structure is not limited herein.

[0050] The semi-circular bracket 11 is divided into an inner semi-circular bracket and an outer semi-circular bracket. The inner semi-circular bracket and the outer semi-circular bracket are concentrically arranged and are connected by bolts.

[0051] In some embodiments, the drive structure is arranged between the regions formed by the inner semi-circular bracket and the outer semi-circular bracket, making the arrangement of the drive structure more reasonable and not occupying extra space.

[0052] In some embodiments, the bracket 1 is provided with a sliding hole, and the telescopic pressing rod 3 movably passes through the sliding hole of the bracket 1. At least one row of meshing teeth is provided on the side wall of the telescopic pressing rod 3. The meshing teeth are the driven ends and are arranged along the linear telescopic end direction of the telescopic pressing rod 3. When the drive structure drives the meshing teeth to move linearly, the telescopic pressing rod 3 can be driven to move linearly.

[0053] In some embodiments, the drive structure includes a gear 2 and a gear drive assembly. A plurality of gears 2 are provided, and each gear 2 meshes with the meshing teeth on one telescopic pressing rod 3 respectively. The gear drive assembly is used to drive each gear 2 to rotate synchronously. As a specific embodiment, 6 gears 2 are provided, 6 telescopic pressing rods 3 are provided, and the angle between each telescopic pressing rod 3 is 60°.

[0054] The gear drive assembly includes a drive motor and a synchronous switch control circuit. A plurality of drive motors are provided, and each drive motor is respectively connected to one gear 2. The synchronous switch control circuit is used to drive each drive motor to run synchronously. The synchronous switch control circuit includes a plurality of synchronous switches, and each synchronous switch controls one drive motor respectively. The synchronous switch is an electric switch and can be started and closed synchronously.

[0055] In some embodiments, the bracket 1, the gear 2, and the telescopic compression rod 3 are all made of high-strength alloy steel materials, which can withstand large pressures and tensile forces, ensuring that the device can work stably for a long time in complex construction environments. High-strength alloy steel usually has good corrosion resistance, especially in the working environments of special industries such as electric power and petrochemical industry, and can effectively resist the influence of chemical media and harsh climates.

[0056] In some embodiments, the above pipeline welding butt joint auxiliary device further includes a high-frequency induction heater 5 and a high-frequency power controller. The high-frequency induction heater 5 is arranged on the bracket 1 or is separately arranged from the bracket 1. The high-frequency induction heater 5 is arranged in a ring shape so that the pipeline to be welded can pass through the middle of the high-frequency induction heater 5. The high-frequency power controller is connected to the high-frequency induction heater 5 and is used to control the high-frequency induction heater 5. The heating coil of the high-frequency induction heater 5 is made of pure copper, with a width of 100 mm and a thickness of 15 mm, which can quickly heat the pipe orifice to be welded, facilitating the correction of the roundness of the pipe orifice.

[0057] In this embodiment, through the high-frequency induction heater and each telescopic compression rod 3, the roundness of the pipe orifice can be quickly corrected, facilitating the welding work and reducing the generation of welding defects. When the wall thickness of the pipeline to be welded is relatively thin or the ovality is relatively small, the operator only needs to fix the device at the position of the pipe orifice with a larger ovality, and use the synchronous switch of the control gear to adjust the telescopic amount of the telescopic compression rod 3 to make the pipe orifice tend to be circular. When the ovality of the pipe orifice of the pipeline to be welded is relatively large or the wall thickness is relatively thick, use the high-frequency induction heater 5 to heat the position to be adjusted, and use the pipeline welding butt joint auxiliary device to adjust it in the hot state of the pipeline.

[0058] According to an embodiment of the present invention, on the second aspect, a method for correcting the welding butt joint of a pipeline is provided. Taking the butt joint before on-site welding of the reheater cold section steam pipeline in a power plant as a construction case, it includes the following steps:

[0059] The first step: Assemble the high-frequency induction heater 5 and heat the position of the pipe orifice of the pipeline to about 500 °C.

[0060] The second step: Clamp the pipeline welding butt joint auxiliary device at the position of the pipe orifice of the large-diameter thin-walled pipeline; adjust the telescopic compression rod 3 so that it can be fixed on the large-diameter thin-walled pipeline. Control the synchronous switch to make each telescopic compression rod 3 extend synchronously until each telescopic compression rod 3 can fully contact the outer wall of the large-diameter thin-walled pipeline.

[0061] The third step: Turn off the synchronous switch, keep each telescopic compression rod 3 in a state of pressing against the outer wall of the large-diameter thin-walled pipeline until the temperature of the pipeline drops to room temperature, and correct the welding butt joint of the large-diameter thin-walled pipeline.

[0062] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An auxiliary device for pipe welding alignment, characterized in that, Comprising: A bracket (1), a through hole for a pipeline to be welded to pass through is provided in the middle of the bracket (1); A telescopic pressing structure, the telescopic pressing structure includes a plurality of telescopic pressing rods (3) evenly spaced along the circumferential direction on the bracket (1), the telescopic pressing rod (3) has a linear telescopic end and a driven end, and the extension lines of the linear telescopic ends of each telescopic pressing rod (3) intersect at the same point, and the ends of the linear telescopic ends of each telescopic pressing rod (3) are located on the same circular arc line; A driving structure, the driving structure is connected to the driven end of each telescopic pressing rod (3) and is used to drive each telescopic pressing rod (3) to perform synchronous telescopic actions.

2. The pipe welding butt joint auxiliary device according to claim 1, characterized in that The bracket (1) is connected into a complete circular structure by two semi-circular brackets (11), and the two semi-circular brackets (11) are connected by an embedded joint (4).

3. The pipe welding butt joint auxiliary device according to claim 2, characterized in that, The semi-circular bracket (11) is divided into an inner semi-circular bracket and an outer semi-circular bracket, the inner semi-circular bracket and the outer semi-circular bracket are arranged concentrically and are connected to each other; the driving structure is arranged between the regions formed by the inner semi-circular bracket and the outer semi-circular bracket.

4. The pipe welding butt joint auxiliary device according to claim 1, wherein, The telescopic pressing rod (3) passes through the bracket (1) movably, at least one row of meshing teeth is arranged on the side wall of the telescopic pressing rod (3), and the meshing teeth are the driven end.

5. The pipe welding butt joint auxiliary device according to claim 4, characterized in that The driving structure includes: A plurality of gears (2), each gear (2) meshes with the meshing teeth on a telescopic pressing rod (3) respectively; A gear driving assembly, the gear driving assembly is used to drive each gear (2) to rotate synchronously.

6. The pipe welding butt joint auxiliary device according to claim 5, wherein, The gear driving assembly includes: A plurality of driving motors, each driving motor is respectively connected to a gear (2); A synchronous switch control circuit, the synchronous switch control circuit is used to drive each driving motor to run synchronously.

7. The pipe welding butt joint auxiliary device according to claim 1, wherein It further includes: A high-frequency induction heater (5), the high-frequency induction heater (5) is arranged on the bracket (1) or is separately arranged from the bracket (1), the high-frequency induction heater (5) is arranged in a ring shape so that the pipeline to be welded can pass through the middle of the high-frequency induction heater (5); A high-frequency power controller, the high-frequency power controller is connected to the high-frequency induction heater (5) and is used to control the high-frequency induction heater (5).

8. The pipe welding butt joint auxiliary device according to any one of claims 1-7, characterized in that, The pipeline welding butt joint auxiliary device is applied to the welding butt joint correction of large-diameter thin-walled pipelines.

9. A method for correcting the alignment of pipeline welding, characterized in that, Including the following steps: S1. Clamp the pipeline welding butt joint auxiliary device according to any one of claims 1-8 at the pipe orifice position of the pipeline to be welded; simultaneously control the linear telescopic ends of each telescopic pressing rod (3) to extend through the driving structure until each telescopic pressing rod (3) can completely contact the outer wall of the pipeline to be welded; S2. Keep each telescopic pressing rod (3) in a state of pressing the outer wall of the pipeline to be welded, and correct the welding butt joint of the pipeline to be welded.

10. The method for correcting the alignment of a pipeline weld as claimed in claim 9, wherein Before performing step S1, it further includes the step: Assemble the high-frequency induction heater (5) and heat the pipe orifice position of the pipeline.

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