Oil and gas transmission pipeline cutting equipment and working method thereof

Abstract

The invention discloses oil and gas conveying pipeline cutting equipment and a working method thereof, and belongs to the field of oil and gas conveying pipeline replacement. The oil and gas conveying pipeline cutting equipment comprises an upstream cutting mechanism coaxially arranged in an upstream pipeline through tensioning equipment and a downstream cutting mechanism coaxially arranged in a downstream pipeline; the upstream cutting mechanism and the downstream cutting mechanism are used for cutting the end face of the upstream pipeline and the end face of the downstream pipeline into grooves with the same angle correspondingly, and therefore the grooves of the upstream pipeline, the top end extension line of the upstream pipeline, the grooves of the downstream pipeline and the bottom end extension line of the downstream pipeline are sequentially connected to form a parallelogram. According to the oil and gas transmission pipeline cutting equipment and the working method thereof, due to the fact that the parallelogram is formed on the end face after cutting, additional grinding and measuring are not needed during alignment, preliminary alignment can be conducted by directly using the outer alignment device, then direct welding is conducted, and the construction time is greatly shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas pipeline replacement, and in particular to an oil and gas pipeline cutting device and a working method thereof. Background Art

[0002] During the emergency repair of urban pipelines, when a pipeline leak is found, it is usually necessary to replace the damaged pipeline section with a new one. In order to ensure a seamless connection between the old and new pipelines, the end faces of the pipeline must be precisely beveled to ensure that the angle between the end face and the center of the pipeline is less than 5 degrees, and the bevels of the end faces of the pipes at both ends should be cut into parallelograms. The traditional processing method is to manually grind and measure the pipe mouth after cutting the pipeline with a split-flap cutting machine. However, this manual operation has many disadvantages: 1. Time-consuming: Manual grinding of pipe end faces is an extremely laborious and time-consuming process. Usually, it may take a skilled pipe worker several hours or even longer to complete the grinding and measurement of a pipe end face. In emergency repair tasks, time is life, and any delay will hinder the progress of the entire project, increasing the repair time and cost.

[0003] 2. High labor intensity: Since manual grinding requires continuous physical effort, especially working in a narrow, humid or poorly ventilated environment, it not only increases the labor intensity of workers, but also easily causes fatigue, thus affecting work efficiency.

[0004] 3. It is difficult to ensure high precision: In the process of manual measurement and polishing of pipe end faces, it is difficult to ensure that each pipe end face meets strict geometric requirements due to the inevitable errors of human eyes and hands. For example, the angle between the end face and the center of the pipe is difficult to control within 5 degrees, and the shape of the parallelogram may also be irregular, which will affect the quality of subsequent welding.

[0005] 4. Reliance on personal experience: The technical level and experience of different workers vary greatly. Even with detailed operating specifications, there will still be large deviations in actual operations. Especially in complex repair environments, inexperienced workers are more likely to make mistakes, further reducing the quality of construction.

[0006] 5. Harsh environment: Manual grinding usually needs to be carried out in a small, humid space, which poses a potential threat to the health and safety of workers. Long-term exposure to such an environment can easily lead to respiratory diseases and other occupational diseases.

[0007] 6. Tool limitations: Traditional hand tools such as grinding wheels and grinders will generate a lot of dust and noise during operation, increasing the possibility of accidents and also causing pollution to the surrounding environment.

[0008] 7. High labor costs: Since manual grinding and measurement take a long time and are difficult, more manpower is required, resulting in a significant increase in labor costs. Especially in some large-scale repair projects, multiple people work at the same time, which increases management complexity and coordination difficulty.

[0009] 8. Material waste: Due to the low precision of manual operation, the pipe end face may be cut unevenly, and the pipe section has to be re-grinded or replaced, which increases material waste and additional repair costs. Summary of the invention

[0010] The purpose of the present invention is to provide an oil and gas pipeline cutting device and a working method thereof to solve the above technical problems.

[0011] To achieve the above-mentioned purpose, the present invention provides an oil and gas pipeline cutting device, comprising an upstream cutting mechanism coaxially arranged in an upstream pipeline via a tensioning device and a downstream cutting mechanism coaxially arranged in a downstream pipeline, the upstream cutting mechanism and the downstream cutting mechanism are used to respectively cut the end face of the upstream pipeline and the end face of the downstream pipeline into grooves with the same angle, so that the groove of the upstream pipeline, the top extension line of the upstream pipeline, the groove of the downstream pipeline, and the bottom extension line of the downstream pipeline are sequentially connected to form a parallelogram; The upstream cutting mechanism and the downstream cutting mechanism both include a positioning plate and a rotating plate rotatably connected to the positioning plate via a rotating bearing, and the positioning plate is also positionally connected to the tensioning device via a positioning structure and a joint bearing respectively; A rotary drive unit and a movable cutting unit are respectively arranged on the rotary disk, wherein the rotary drive unit is used for circumferentially cutting the upstream pipeline or the downstream pipeline, and the movable cutting unit is used for performing feed cutting.

[0012] Preferably, the rotation driving unit comprises a first reduction motor fixed on the rotating disk, the output shaft of the first reduction motor is connected to the rotation driving gear, and the rotation driving gear is meshed with an inner gear ring opened on the inner wall of the positioning disk.

[0013] Preferably, the mobile cutting unit comprises a second reduction motor fixed on the rotating disk, and the output end of the second reduction motor is fixedly connected to the plasma gun head via a belt transmission structure and a rotation-transferring structure in sequence.

[0014] Preferably, the belt transmission structure comprises a driving wheel rotatably arranged on a rotating disk via a support plate and a driven wheel connected to the driving wheel via a transmission belt; The rotation-to-movement structure comprises a lead screw connected to a driven wheel and a slider threadedly connected to the lead screw, and the slider is fixedly connected to the plasma gun head via a suspension rod.

[0015] Preferably, the inner circumference side of the positioning plate is movably connected to the tensioning device via a joint bearing, the end surface side of the positioning plate is rotatably connected to the rotating plate via a rotating bearing, and a plurality of positioning structures are evenly arranged on the outer circumference side of the positioning plate.

[0016] Preferably, the positioning structure comprises a telescopic rod with two ends movably connected to the positioning plate and the tensioning device respectively, and the outer tube and the inner tube of the telescopic rod are positioned and connected via positioning screws.

[0017] Preferably, the first reduction motor and the second reduction motor each include a stepper motor and a right-angle reducer fixedly connected to an output end of the stepper motor.

[0018] Preferably, the rotary drive unit and the movable cutting unit are arranged axially symmetrically.

[0019] A working method of an oil and gas pipeline cutting device comprises the following steps: S1. The upstream cutting mechanism and the downstream cutting mechanism are hoisted into the upstream pipeline and the downstream pipeline respectively, and tightened and positioned by the tightening device; S2. Remove the positioning screws and adjust the angle of the positioning disk, thereby adjusting the angles of the upstream cutting mechanism and the downstream cutting mechanism, so that the positioning disk of the upstream cutting mechanism and the positioning disk of the downstream cutting mechanism are parallel, and then re-tighten the positioning screws to fix the current angle of the positioning disk; S3, open the plasma gun head, and then turn on the second reduction motor. The second reduction motor drives the lead screw to rotate through the belt transmission structure. With the cooperation of the thread, the slider is driven to move along the lead screw, thereby driving the plasma gun head to feed. After it is in place, the second reduction motor is turned off; S4, turning on the first reduction motor, the first reduction motor drives the rotation driving gear to rotate, and under the meshing of the inner gear ring, drives the rotating disk to rotate, and then drives the plasma gun head on the rotating disk to rotate, performing circumferential cutting until a cut is formed; S5, turning off the first reduction motor and the plasma gun head, and after releasing the positioning between the tensioning device and the inner wall of the upstream pipeline or the downstream pipeline, taking out the tensioning device and the upstream cutting mechanism and the downstream cutting mechanism.

[0020] Therefore, the present invention adopts the above-mentioned oil and gas pipeline cutting device and working method, which has the following beneficial effects: 1. Improve work efficiency: completely replace manual grinding and measurement, greatly shorten the time of pipe end face groove processing; 2. Improve cutting accuracy: By setting the joint bearing, the end cutting angle of the pipe can be set to ensure that the end face of the pipe forms a standard parallelogram, reduce human errors, and improve the subsequent welding quality.

[0021] In summary, the oil and gas pipeline cutting equipment and working method described in the present invention not only solve the problems of low efficiency and poor precision in the prior art, but also significantly improve the overall quality and safety of pipeline repair work, and are particularly suitable for operations in narrow spaces during urban pipeline repair.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an upstream cutting mechanism or a downstream cutting mechanism of an oil and gas pipeline cutting device of the present invention; Figure 2 It is an axial cross-sectional view of an upstream cutting mechanism or a downstream cutting mechanism of an oil and gas pipeline cutting device of the present invention.

[0024] Reference numerals 1. Rotating plate; 2. Inner gear ring; 3. Positioning plate; 4. Positioning screw; 5. Telescopic rod; 6. First reduction motor; 7. Plasma gun head; 8. Suspension rod; 9. Driven wheel; 10. Driving wheel; 11. Belt; 12. Second reduction motor; 13. Tensioning device; 14. Spherical bearing; 15. Lead screw; 16. Sliding block; 17. Rotating driving gear; 18. Rotating bearing. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not used to limit the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0026] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0027] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] like Figure 1 and Figure 2As shown, an oil and gas pipeline cutting device includes an upstream cutting mechanism coaxially arranged in the upstream pipeline through a tensioning device 13 and a downstream cutting mechanism coaxially arranged in the downstream pipeline. The upstream cutting mechanism and the downstream cutting mechanism are used to cut the end face of the upstream pipeline and the end face of the downstream pipeline into grooves of the same angle respectively, so that the groove of the upstream pipeline, the top extension line of the upstream pipeline, the groove of the downstream pipeline, and the bottom extension line of the downstream pipeline are connected in sequence to form a parallelogram.

[0029] Specifically, the upstream cutting mechanism and the downstream cutting mechanism both include a positioning disk 3 and a rotating disk 1 rotatably connected to the positioning disk 3 via a rotating bearing 18, and the positioning disk 3 is also respectively connected to the tensioning device 13 via a positioning structure and a joint bearing 14; a rotating drive unit and a mobile cutting unit are respectively provided on the rotating disk 1, wherein the rotating drive unit is used for circumferentially cutting the upstream pipeline or the downstream pipeline, and the mobile cutting unit is used for performing feed cutting.

[0030] The mobile cutting unit comprises a second reduction motor 12 fixed on the rotating disk 1, and the output end of the second reduction motor 12 is fixedly connected to the plasma gun head 7 via the belt 11 transmission structure and the rotation-transfer movement structure in sequence.

[0031] The belt 11 transmission structure includes a driving wheel 10 rotatably arranged on the rotating disk 1 via a support plate and a driven wheel 9 connected to the driving wheel 10 via a transmission belt 11; the rotation-transferring structure includes a screw 15 connected to the driven wheel 9 and a slider 16 threadedly connected to the screw 15, and the slider 16 is fixedly connected to the plasma gun head 7 via a suspension rod 8.

[0032] The inner circumference of the positioning disk 3 is movably connected to the tensioning device 13 via the joint bearing 14, the end surface of the positioning disk 3 is rotatably connected to the rotating disk 1 via the rotating bearing 18, and multiple groups of positioning structures are evenly arranged on the outer circumference of the positioning disk 3.

[0033] The positioning structure comprises a telescopic rod 5 whose two ends are movably connected to the positioning plate 3 and the tensioning device 13 respectively, and the outer tube and the inner tube of the telescopic rod 5 are positioned and connected via positioning screws 4.

[0034] The first reduction motor 6 and the second reduction motor 12 both include a stepper motor and a right-angle reducer fixedly connected to the output end of the stepper motor.

[0035] The rotary drive unit and the movable cutting unit are arranged axially symmetrically.

[0036] A working method of an oil and gas pipeline cutting device comprises the following steps: S1, hoisting the upstream cutting mechanism and the downstream cutting mechanism into the upstream pipeline and the downstream pipeline respectively, and tightening and positioning them by the tightening device 13; S2, remove the positioning screw 4, adjust the angle of the positioning disk 3, and thus adjust the angles of the upstream cutting mechanism and the downstream cutting mechanism, so that the positioning disk 3 of the upstream cutting mechanism and the positioning disk 3 of the downstream cutting mechanism are parallel, and then re-tighten the positioning screw 4 to fix the current angle of the positioning disk 3; S3, turn on the plasma gun head 7, and then turn on the second reduction motor 12. The second reduction motor 12 drives the lead screw 15 to rotate through the belt 11 transmission structure, and under the cooperation of the thread, drives the slider 16 to move along the lead screw 15, thereby driving the plasma gun head 7 to feed. After it is in place, turn off the second reduction motor 12. The in-place distance in this embodiment is determined according to the wall thickness of the pipe; S4, turning on the first reduction motor 6, the first reduction motor 6 drives the rotation driving gear to rotate, and under the meshing of the inner gear ring 2, drives the rotating disk 1 to rotate, and then drives the plasma gun head 7 on the rotating disk 1 to rotate, performing circumferential cutting until a cut is formed; S5, turning off the first reduction motor 6 and the plasma gun head 7, and after releasing the positioning between the tensioning device 13 and the inner wall of the upstream pipeline or the downstream pipeline, taking out the tensioning device 13 and the upstream cutting mechanism and the downstream cutting mechanism.

[0037] It should be noted that the above-mentioned tensioning device adopts a mature product on the market, and this embodiment does not improve it, so its structural principle will not be described in detail here.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An oil and gas pipeline cutting device, characterized in that: It includes an upstream cutting mechanism coaxially arranged in the upstream pipe and a downstream cutting mechanism coaxially arranged in the downstream pipe via a tensioning device, the upstream cutting mechanism and the downstream cutting mechanism are used to cut the end face of the upstream pipe and the end face of the downstream pipe into grooves of the same angle respectively, so that the groove of the upstream pipe, the top extension line of the upstream pipe, the groove of the downstream pipe, and the bottom extension line of the downstream pipe are connected in sequence to form a parallelogram; The upstream cutting mechanism and the downstream cutting mechanism both include a positioning plate and a rotating plate rotatably connected to the positioning plate via a rotating bearing, and the positioning plate is also positionally connected to the tensioning device via a positioning structure and a joint bearing respectively; A rotary drive unit and a movable cutting unit are respectively arranged on the rotary disk, wherein the rotary drive unit is used for circumferentially cutting the upstream pipeline or the downstream pipeline, and the movable cutting unit is used for performing feed cutting.

2. The oil and gas pipeline cutting device according to claim 1, characterized in that: The rotation driving unit comprises a first reduction motor fixed on the rotating disk, the output shaft of the first reduction motor is connected with the rotation driving gear, and the rotation driving gear is meshed with an inner gear ring opened on the inner wall of the positioning disk.

3. The oil and gas pipeline cutting device according to claim 2 is characterized in that: The mobile cutting unit comprises a second reduction motor fixed on the rotating disk, and the output end of the second reduction motor is fixedly connected to the plasma gun head via a belt transmission structure and a rotation-transferring structure in sequence.

4. The oil and gas pipeline cutting device according to claim 3 is characterized in that: The belt transmission structure includes a driving wheel rotatably arranged on a rotating disk via a support plate and a driven wheel connected to the driving wheel via a transmission belt; The rotation-to-movement structure comprises a lead screw connected to a driven wheel and a slider threadedly connected to the lead screw, and the slider is fixedly connected to the plasma gun head via a suspension rod.

5. The oil and gas pipeline cutting device according to claim 4, characterized in that: The inner circumference side of the positioning plate is movably connected to the tensioning device via a joint bearing, the end surface side of the positioning plate is rotatably connected to the rotating plate via a rotating bearing, and multiple groups of positioning structures are evenly arranged on the outer circumference side of the positioning plate.

6. The oil and gas pipeline cutting device according to claim 5, characterized in that: The positioning structure comprises a telescopic rod with two ends movably connected to the positioning plate and the tensioning device respectively, and the outer tube and the inner tube of the telescopic rod are positioned and connected via positioning screws.

7. The oil and gas pipeline cutting device according to claim 6, characterized in that: The first reduction motor and the second reduction motor both include a stepper motor and a right-angle reducer fixedly connected to the output end of the stepper motor.

8. The oil and gas pipeline cutting device according to claim 7, characterized in that: The rotary drive unit and the movable cutting unit are arranged axially symmetrically.

9. A method for operating an oil and gas pipeline cutting device, using the oil and gas pipeline cutting device according to claim 8, characterized in that: The following steps are involved: S1. The upstream cutting mechanism and the downstream cutting mechanism are hoisted into the upstream pipeline and the downstream pipeline respectively, and tightened and positioned by the tightening device; S2. Remove the positioning screws and adjust the angle of the positioning disk, thereby adjusting the angles of the upstream cutting mechanism and the downstream cutting mechanism, so that the positioning disk of the upstream cutting mechanism and the positioning disk of the downstream cutting mechanism are parallel, and then re-tighten the positioning screws to fix the current angle of the positioning disk; S3, open the plasma gun head, and then turn on the second reduction motor. The second reduction motor drives the lead screw to rotate through the belt transmission structure. With the cooperation of the thread, the slider is driven to move along the lead screw, thereby driving the plasma gun head to feed. After it is in place, the second reduction motor is turned off; S4, turning on the first reduction motor, the first reduction motor drives the rotation driving gear to rotate, and under the meshing of the inner gear ring, drives the rotating disk to rotate, and then drives the plasma gun head on the rotating disk to rotate, performing circumferential cutting until a cut is formed; S5, turning off the first reduction motor and the plasma gun head, and after releasing the positioning between the tensioning device and the inner wall of the upstream pipeline or the downstream pipeline, taking out the tensioning device and the upstream cutting mechanism and the downstream cutting mechanism.

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