Pipe line gas cutting and trimming device

Abstract

The utility model belongs to the technical field of gas cutting auxiliary tool for pipeline construction, concretely relates to a pipeline gas cutting neat mouth device, aims at solving the problem of uneven cutting, big gap between weld joint, needing secondary mouth repair, low operation efficiency and big labour intensity. The utility model includes upper cambered board, lower cambered board, first half ring plate, second half ring plate, detachable door shaft hinge and buckle, one side of upper cambered board and lower cambered board is connected through detachable door shaft hinge, and the other side is connected through buckle, first half ring plate is fixedly connected at the end of upper cambered board perpendicularly, second half ring plate is fixedly connected at the end of lower cambered board perpendicularly, and first half ring plate and second half ring plate are used for providing the guide reference surface for gas cutting gun. The utility model through the cooperation of openable and closeable ring structure and vertical guide reference surface, has guaranteed the constancy of gas cutting angle, thereby has formed neat cutting in one time, has improved cutting quality and operation efficiency significantly.

Description

Technical Field

[0001] This utility model belongs to the technical field of gas cutting auxiliary tools for pipeline construction, and specifically relates to a pipeline gas cutting end-cutting device. Background Technology

[0002] When carrying out pipeline construction, repair, or replacement operations in oil fields, chemical industries, etc., it is often necessary to connect or partially replace water injection pipelines. In this process, gas cutting is usually used to cut the pipeline and trim the cut to obtain a flat, perpendicular "jaw" to the pipeline axis, thus creating favorable conditions for subsequent welding.

[0003] Currently, gas cutting for pipe joints is mostly performed manually without specialized tools. This method relies entirely on the operator's experience and skill level. In practice, due to various factors such as limited workspace, insufficient stability of the operator's hand holding the cutting torch, and inaccurate control of the angle between the cutting torch and the pipeline axis, the cut ends are easily uneven and not perpendicular to the ideal plane of the pipeline. Such uneven cuts result in excessively large weld gaps when the pipelines are joined, seriously affecting the weld quality. Furthermore, it usually requires secondary or even multiple finishing processes, which is time-consuming, labor-intensive, inefficient, and increases material waste and operating costs.

[0004] In the prior art, there are some devices used to assist in pipe cutting. For example, Chinese Utility Model Patent CN119820033A discloses a "device for assisting gas cutting beveling." This device, through a fixing sleeve and a cutting angle control component, can effectively control the angle of the gas cutting torch during beveling, ensuring the accuracy of the bevel surface. However, this device is specifically designed for processing bevels at specific angles, and its core structure is controlling an inclined cutting surface. It cannot be used to process a flat, clean cut perpendicular to the pipeline because its design goals and structure are completely different from the "clean cut" processing problem that this application aims to solve.

[0005] Therefore, there is still a lack of a dedicated tool that can be used to quickly and accurately complete pipeline gas cutting and trimming operations.

[0006] In summary, there is an urgent need in the field for a device that is simple in structure, easy to operate, and can effectively guarantee cutting quality, specifically designed for gas cutting of pipelines, in order to overcome the aforementioned deficiencies in the prior art. Utility Model Content

[0007] To address the aforementioned problems in the prior art, namely the issues of uneven cuts, large weld gaps, the need for secondary finishing, low work efficiency, and high labor intensity caused by unstable operation and inaccurate angle control when manually cutting pipelines without auxiliary tools, this utility model provides a pipeline gas cutting edge trimming device, comprising an upper arc plate, a lower arc plate, a first semi-annular plate, a second semi-annular plate, a detachable door hinge, and a buckle;

[0008] The upper arc plate and the lower arc plate are connected on one side by the detachable door hinge and on the other side by the buckle, so that the upper arc plate and the lower arc plate form an openable and fixable ring structure.

[0009] The first semi-annular plate is vertically fixed to the end of the upper arc plate, and the second semi-annular plate is vertically fixed to the end of the lower arc plate. The first and second semi-annular plates are used to provide a guide reference surface for the gas cutting gun.

[0010] Furthermore, both the first semi-annular plate and the second semi-annular plate are semi-annular structures, and their inner edge contours match the outer wall of the working pipeline.

[0011] Furthermore, the detachable door hinge is fixedly connected to the upper arc plate and the lower arc plate by welding.

[0012] Furthermore, the buckle is fixedly connected to the upper arc plate and the lower arc plate by welding.

[0013] Furthermore, the curvature of the upper and lower arc plates matches the outer diameter of the working pipeline.

[0014] Furthermore, the widths of the first semi-annular plate and the second semi-annular plate are the same.

[0015] Furthermore, the first semi-annular plate and the second semi-annular plate are respectively fixedly connected to the upper arc plate and the lower arc plate by welding.

[0016] Furthermore, the upper arc plate, lower arc plate, first semi-annular plate, and second semi-annular plate are all made of steel plates.

[0017] Furthermore, the device as a whole is a welded metal structure.

[0018] Furthermore, the detachable door hinge and the buckle are located on opposite sides of the annular structure, respectively.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a stable and precise vertical guide surface for the gas cutting torch by fixing the first and second semi-annular plates vertically to the ends of the upper and lower arc plates. During operation, the cutting torch moves close to this guide surface, ensuring that the torch remains perpendicular to the pipeline axis throughout the cutting process. This results in a smooth, even cut perpendicular to the pipeline in one operation, effectively solving the problem of uneven cuts caused by inaccurate angle control during manual operation. This ensures uniform and compliant weld joint gaps during subsequent pipeline assembly, fundamentally avoiding excessive weld gaps due to uneven cuts and significantly improving the quality of the welded joint.

[0021] The hinge and locking mechanisms of this invention allow the device to be quickly fitted onto the work pipeline and securely fixed, achieving rapid positioning. Combined with the aforementioned precise guiding function, operators can complete high-quality cuts in one go, eliminating the need for subsequent trimming. This significantly reduces the operation time for a single cut and substantially improves work efficiency.

[0022] This invention features a simple structure and convenient, labor-saving operation, reducing reliance on the operator's individual gas cutting skills. By avoiding secondary finishing and reducing rework, it directly saves on operating costs such as labor time and gas consumption, while also reducing the labor intensity of workers. Attached Figure Description

[0023] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of a pipeline gas cutting end-cutting device according to the present invention;

[0025] Figure 2 This is a schematic diagram of a detachable door hinge in a pipeline gas cutting and slitting device of this utility model. Detailed Implementation

[0026] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] This utility model discloses a pipeline gas cutting end-cutting device, comprising an upper arc plate 1, a lower arc plate 2, a first semi-annular plate 3, a second semi-annular plate 4, a detachable hinge 5, and a buckle 6. One side of the upper arc plate 1 and the lower arc plate 2 are connected by the detachable hinge 5, and the other side is connected by the buckle 6, forming an openable and fixable annular structure. The first semi-annular plate 3 is vertically fixed to the end of the upper arc plate 1, and the second semi-annular plate 4 is vertically fixed to the end of the lower arc plate 2. The first semi-annular plate 3 and the second semi-annular plate 4 provide a guiding reference surface for the gas cutting torch.

[0029] See Figure 1 In practical implementation, firstly, upper arc plate 1 and lower arc plate 2, matching the outer diameter of the pipeline to be cut, are made. Both can be made of 3-6 mm thick Q235 steel plates. The first semi-annular plate 3 is vertically fixed to the end edge of the upper arc plate 1 by full welding, and similarly, the second semi-annular plate 4 is vertically fixed to the end edge of the lower arc plate 2. Then, the two flaps of the detachable door hinge 5 are welded to the middle position on one side of the upper arc plate 1 and the lower arc plate 2, respectively, and the corresponding parts of the buckle 6 are welded to the middle position on the other side. After welding, the firmness and opening and closing flexibility of each connection part need to be checked. In actual use, the buckle 6 is opened, the device is put on the pipeline, the buckle is locked, and the cutting position is adjusted so that the cutting torch nozzle moves close to the inner edge of the semi-annular plate to complete the cut. This structure ensures that the cutting torch always maintains a perpendicular posture to the pipeline axis during the cutting process, thus forming a neat vertical cut in one go, effectively solving the problem of uneven cuts caused by manual operation.

[0030] Both the first semi-annular plate 3 and the second semi-annular plate 4 are semi-annular structures, with their inner edges matching the outer wall of the working pipeline. In practice, the inner diameter of the semi-annular plate should be slightly larger than the outer diameter of the pipeline by 1-2 mm, and the width should be 20-40 mm. It is made of steel plate of the same material as the curved plate, cold-bent and welded in place. This design ensures a precise guiding fit between the inner edge of the semi-annular plate and the outer wall of the pipeline, providing a stable and reliable movement trajectory for the cutting torch and guaranteeing the roundness of the cut surface.

[0031] The detachable door hinge 5 is fixedly connected to the upper arc plate 1 and the lower arc plate 2 by welding. (See also...) Figure 2 During implementation, standard detachable door hinges were selected, and their two hinge plates were securely connected to the upper arc plate 1 and the lower arc plate 2 respectively by continuous fillet welding. This connection method not only ensures structural strength but also enables quick opening and closing of the device through the detachable hinge shaft, greatly facilitating installation and disassembly operations in narrow spaces.

[0032] The buckle 6 is fixedly connected to the upper arc plate 1 and the lower arc plate 2 by welding. During implementation, a pin-type or spring-type quick-locking mechanism is used, with its components welded to the corresponding positions. The welded buckle ensures that the device remains tightly closed during operation, effectively preventing it from loosening under cutting force, while also achieving quick clamping and fixing.

[0033] The curvature of the upper arc plate 1 and the lower arc plate 2 matches the outer diameter of the working pipeline. During implementation, the bending radius of the arc plates must be precisely controlled according to the pipeline specifications to ensure that the inner arc surface of the arc plate fits well with the outer wall of the pipeline. This fitting design improves the stability of the device after installation, avoids relative displacement during the cutting process, and further ensures cutting accuracy.

[0034] The first semi-annular plate 3 and the second semi-annular plate 4 have the same width. During implementation, a uniform cutting size ensures that the two semi-annular plates have the same axial width. This symmetrical design gives the device consistent guiding performance at both ends, ensuring the same processing quality regardless of which end the cutting begins from.

[0035] The first semi-annular plate 3 and the second semi-annular plate 4 are respectively fixedly connected to the upper arc plate 1 and the lower arc plate 2 by welding. A full welding process is used to ensure the connection strength, and the perpendicularity must be checked after welding. The robust welded connection ensures that the guide reference surface will not deflect during use, maintaining long-term reliability.

[0036] The upper arc plate 1, lower arc plate 2, first semi-annular plate 3, and second semi-annular plate 4 are all made of steel plates. In practice, all components are made of low-carbon steel plates with good weldability, and the appropriate thickness of 3-6 mm is selected based on the stress characteristics of different components. The choice of steel ensures both the structural strength and service life of the device, and also facilitates manufacturing using mature welding processes.

[0037] The device is an overall welded metal structure. During implementation, all connections are completed using welding processes, forming a complete rigid structure. This all-welded construction gives the device excellent integrity and durability, enabling it to withstand harsh working conditions at construction sites.

[0038] The detachable door hinge 5 and the buckle 6 are located on opposite sides of the annular structure. During implementation, it should be ensured that they are precisely distributed symmetrically in the diametrical direction. This symmetrical layout ensures even distribution of locking force, avoids misalignment after installation, and provides a fundamental guarantee for precise cutting.

[0039] In actual operation, first, open the latch 6 to separate the upper arc plate 1 from the lower arc plate 2, and then fit the device onto the pipeline to be cut. Close the device and securely lock it in the predetermined cutting position using the latch 6, ensuring a tight fit between the device and the outer wall of the pipeline. Adjust the position of the device along the pipeline axis, leaving the required cutting allowance. After positioning, the operator places the cutting nozzle of the gas cutting torch against the inner edge of the first semi-annular plate 3 and cuts the first half of the pipeline from top to bottom along the outer wall; then, move the cutting nozzle to the inner edge of the second semi-annular plate 4 and cut the second half of the pipeline in the same way. Throughout the cutting process, the cutting torch is always constrained by the inner edge of the semi-annular plate, thus maintaining a perpendicular relationship with the pipeline axis. After cutting, open the latch 6 to remove the device. This standardized operating procedure not only ensures a neat and uniform vertical cut for each cut, but also effectively shortens the time for a single cutting operation, while completely avoiding subsequent finishing processes, significantly improving construction efficiency while ensuring welding quality.

[0040] The terms “first”, “second”, etc., are used to distinguish similar objects, not to describe or indicate a specific order or sequence.

[0041] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0042] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A pipeline gas cutting end-cutting device, characterized in that, It includes an upper arc plate (1), a lower arc plate (2), a first semi-circular plate (3), a second semi-circular plate (4), a detachable door hinge (5), and a buckle (6); The upper arc plate (1) and the lower arc plate (2) are connected on one side by the detachable door hinge (5) and on the other side by the buckle (6), so that the upper arc plate (1) and the lower arc plate (2) form an openable and fixed ring structure. The first semi-annular plate (3) is vertically fixed to the end of the upper arc plate (1), and the second semi-annular plate (4) is vertically fixed to the end of the lower arc plate (2). The first semi-annular plate (3) and the second semi-annular plate (4) are used to provide a guide reference surface for the gas cutting gun.

2. The pipeline gas cutting end-cutting device according to claim 1, characterized in that, Both the first semi-annular plate (3) and the second semi-annular plate (4) are semi-annular structures, and their inner edge contours match the outer wall of the working pipeline.

3. The pipeline gas cutting end-cutting device according to claim 1, characterized in that, The detachable door hinge (5) is fixedly connected to the upper arc plate (1) and the lower arc plate (2) by welding.

4. The pipeline gas cutting end-cutting device according to claim 1, characterized in that, The buckle (6) is fixedly connected to the upper arc plate (1) and the lower arc plate (2) by welding.

5. The pipeline gas cutting end-cutting device according to claim 1, characterized in that, The curvature of the upper arc plate (1) and the lower arc plate (2) matches the outer diameter of the working pipeline.

6. The pipeline gas cutting end-cutting device according to claim 1, characterized in that, The widths of the first semi-annular plate (3) and the second semi-annular plate (4) are the same.

7. The pipeline gas cutting end-cutting device according to claim 1, characterized in that, The first semi-annular plate (3) and the second semi-annular plate (4) are fixedly connected to the upper arc plate (1) and the lower arc plate (2) respectively by welding.

8. The pipeline gas cutting end-cutting device according to claim 1, characterized in that, The upper arc plate (1), lower arc plate (2), first semi-circular plate (3), and second semi-circular plate (4) are all made of steel plate.

9. The pipeline gas cutting end-cutting device according to claim 1, characterized in that, The device is an overall welded metal structure.

10. The pipeline gas cutting end-cutting device according to any one of claims 1 to 9, characterized in that, The detachable door hinge (5) and the buckle (6) are located on opposite sides of the annular structure, respectively.

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