Oil and gas pipeline stress area detection equipment and detection method thereof

Abstract

The invention discloses oil and gas pipeline stress area detection equipment and a detection method thereof, and relates to the technical field of pipeline stress detection.The oil and gas pipeline stress area detection equipment comprises a shell, two sliding rails are arranged in the shell, one side of each sliding rail is slidably connected with a middle plate, and a sliding plate is slidably connected into each middle plate; an upper sliding shell and a lower sliding shell are arranged on the outer wall of the sliding plate, a first limiting block is arranged on the edge of one end of the sliding rail, a second limiting block is arranged on the edge of the other end of the sliding rail, and a limiting block is arranged on the edge of one side of the middle plate. According to the oil and gas pipeline stress area detection equipment disclosed by the invention, a complete ring is formed between the moving plate and the fixed plate and surrounds the pipeline for a circle, the magnetic flux sensors on the moving plate and the fixed plate detect the outer wall of the pipeline, and the stress concentration area on the outer wall of the pipeline is analyzed by analyzing the change of magnetic flux. Defects or cracks on the outer wall of the pipeline are detected, and the effect of rapidly and accurately detecting the defects on the pipeline is achieved.

Description

Technical Field

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

[0002] Pipeline defect detection technology is widely used in the oil, natural gas, water conservancy and other industries. It aims to ensure the safe operation of pipelines and extend their service life. With the advancement of science and technology, various detection methods have continued to develop, from the initial manual visual inspection and simple measurement to today's high-tech detection methods, such as ultrasonic detection, magnetic particle detection and intelligent robot detection. Especially in recent years, pipeline monitoring systems based on the Internet of Things and artificial intelligence technologies have gradually emerged, which can realize real-time monitoring and data analysis.

[0003] Modern pipeline inspection technology is constantly improving. When conducting defect inspection, general pipeline inspection agencies often rely on manual handheld equipment for local inspection. This method has the problem of low efficiency. Manual operation is easily limited by the inspection environment, resulting in extended inspection cycles. Manual inspection has large errors, and the accuracy of the inspection results may be affected by factors such as the operator's experience level and subjective judgment. Manual inspection requires a lot of manpower, which increases the overall inspection cost, restricts the timeliness and economy of pipeline inspection, and cannot meet actual needs. Summary of the invention

[0004] The present invention discloses an oil and gas pipeline stress zone detection device and a detection method thereof, aiming to solve the problem that general pipeline detection institutions often rely on manual handheld devices to perform local detection when performing defect detection. This method has the problem of low efficiency, manual operation is easily limited by the detection environment, resulting in a prolonged detection cycle, large errors in manual detection, and the accuracy of the detection result may be affected by factors such as the operator's experience level and subjective judgment.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The cam is an axially traversing plate, and the cam is provided with a plurality of sliding rails, each of which is connected to the upper and lower sliding rails by sliding. A sliding mechanism is installed on the inner side of the shell, and the sliding mechanism enables the shell to slide on the pipeline.

[0006] A movement mechanism is installed on one side of the housing, and the movement mechanism is used to help movement on the pipeline; A transmission mechanism is installed inside the housing, and the transmission mechanism is used to drive the upper sliding housing and the lower sliding housing to move; A connecting mechanism is provided at the connection between the upper sliding shell and the lower sliding shell, and the connecting mechanism is used to connect the upper sliding shell and the lower sliding shell.

[0007] The sliding mechanism includes a plurality of first buffer plates rotatably connected to one side of the outer shell, the upper sliding shell and the lower sliding shell respectively, one side of the first buffer plate is rotatably connected to the second buffer plate, one end of the second buffer plate is rotatably connected to a connecting block, one side of the connecting block is rotatably connected to a rolling roller, and the outer surface of the rolling roller is rotatably connected to a plurality of guide wheels.

[0008] A third torsion spring is provided at the connection between the first buffer plate and the second buffer plate, and every two first buffer plates and second buffer plates form a group. The rolling roller is provided between the two second buffer plates, and the pipe is located between the plurality of rolling rollers, and the outer wall of the pipe contacts the guide wheel.

[0009] In a preferred embodiment, the movement mechanism includes two mounting plates fixedly connected to the other side of the shell, one side of the mounting plates is rotatably connected to a transmission frame, one end of the transmission frame is rotatably connected to a guide roller, one side of the transmission frame is rotatably connected to a connecting plate, two fixed blocks are fixedly connected to one side of the shell near the mounting plates, one side of the fixed block is rotatably connected to a rotating frame, a first torsion spring is provided at the connection between the rotating frame and the fixed block, one end of the rotating frame is fixedly connected to a second motor, and one end of an output shaft of the second motor is fixedly connected to the first roller.

[0010] The connecting plate is rotatably connected to the rotating frame, one side of the upper sliding shell and the lower sliding shell are respectively fixedly connected to two fixing plates, one side of the fixing plate is rotatably connected to an auxiliary frame, one end of the auxiliary frame is fixedly connected to a third motor, one end of the third motor output shaft is fixedly connected to a second roller, a second torsion spring is arranged between the fixing plate and the auxiliary frame, a first handle is fixedly connected to the upper surface of the shell, and a second handle is fixedly connected to the upper surface of the mounting plate.

[0011] In a preferred embodiment, the transmission mechanism includes a plurality of limit frames fixedly connected to the inner wall of the top of the outer shell, a first motor is fixedly connected to a position close to the limit frame on one side of the outer shell, one end of the output shaft of the first motor is fixedly connected to a transmission gear, a rubber tube is slidably connected to the inside of the limit frame, and a steel wire rope is arranged inside the rubber tube.

[0012] The material of the rubber tube has a certain elasticity, and the material is steel wire. One end of the rubber tube is fixedly connected to one end of the upper sliding shell and the lower sliding shell respectively. A plurality of convex rings are arranged on the outer wall of the rubber tube. The convex rings are meshed with the transmission gears. The rotation of the transmission gear drives the rubber tube to slide inside the limit frame. A baffle is arranged on the inner wall of one side of the shell at the bottom position of the transmission gear.

[0013] In a preferred solution, the connecting mechanism includes a first gear rotatably connected to the inner wall of the bottom end of the upper sliding shell, a first connecting clip fixedly connected to one side of the first gear, a second gear rotatably connected to the inner wall of the bottom end of the upper sliding shell near the first gear, a second connecting clip fixedly connected to one side of the second gear, a linkage frame fixedly connected to the top of the second connecting clip, a mounting frame fixedly connected to the inner wall of the bottom end of the upper sliding shell near the linkage frame, and an insertion rod slidably connected to the top of the mounting frame.

[0014] The top end of the insertion rod is rotatably connected to a middle bar, and the middle bar is rotatably connected to the top of the linkage frame. One end of the insertion rod is sleeved with a connecting spring, and a slot is provided at the bottom of the insertion rod. A block is fixedly connected to the top of the lower sliding shell, and a second connecting clip is fixedly connected to the top inner wall of the lower sliding shell, and the position of the second connecting clip is located between the first connecting clip and the second connecting clip.

[0015] A detection method for an oil and gas pipeline stress zone detection device comprises the following steps: S1. Preparation: The outer shell is put on the pipe, and the multiple guide wheels are in contact with the outer wall of the pipe. The middle plate is driven to slide on the slide rail, and the sliding plate is driven to slide on the middle plate, so that the upper sliding shell and the lower sliding shell are continuously slid forward until the upper sliding shell and the lower sliding shell are in contact, and the upper sliding shell, the lower sliding shell and the outer shell are connected into a ring and put on the pipe; S2, connection: during the contact between the upper sliding shell and the lower sliding shell, the insertion rod squeezes the card slot at the top of the lower sliding shell, driving the insertion rod to slide and squeeze the connecting spring at the same time, thereby driving the second gear and the first gear to rotate relative to each other, and the fixing rod enters between the first connecting clip and the second connecting clip, so that the card block is stuck in the inside of the card slot, and the insertion rod returns to the original position, and the first connecting clip and the second connecting clip clamp the fixing rod, thereby realizing the connection between the upper sliding shell and the lower sliding shell; S3. Detection: During the movement of the upper sliding shell and the lower sliding shell, the moving plate is driven to move, and a complete ring is formed between the moving plate and the fixed plate to surround the pipeline. Multiple magnetic flux sensors on the moving plate and the fixed plate detect the outer wall of the pipeline. In the area where stress is concentrated on the outer wall of the pipeline, the magnetic flux will increase abnormally. By analyzing the change of magnetic flux, defects or cracks on the outer wall of the pipeline are detected; S4. Turning: When the outer shell moves to the right-angle bend of the pipeline, the guide roller slides to cause the transmission frame to rotate, so that the first roller gradually separates from the outer surface of the pipeline, and the side of the outer shell close to the first roller picks up the power movement speed to reduce, so that the speeds of the outer shell, the upper sliding shell and the lower sliding shell on both sides of the right-angle bend of the pipeline are different, so that the outer shell, the upper sliding shell and the lower sliding shell turn on the outer surface of the pipeline.

[0016] It can be seen from the above that the oil and gas pipeline stress zone detection equipment provided by the present invention has the following technical effects.

[0017] First, a complete ring is formed between the moving plate and the fixed plate, surrounding the pipeline. Multiple magnetic flux sensors on the moving plate and the fixed plate detect the outer wall of the pipeline. The magnetic flux will increase abnormally in the area where stress is concentrated on the outer wall of the pipeline. By analyzing the changes in the magnetic flux, defects or cracks on the outer wall of the pipeline are detected, which has the effect of quickly and accurately detecting defects on the pipeline.

[0018] Secondly, the connecting plate drives the rotating frame and the first roller to move, so that the first roller gradually separates from the outer surface of the pipe, and the picking-up power movement speed of the side of the outer shell close to the first roller is reduced. The second roller continues to rotate to drive the upper sliding shell and the lower sliding shell to continue to move on the outer wall of the pipe, so that the speeds of the outer shell, the upper sliding shell and the lower sliding shell on both sides of the right-angle turn of the pipe are different, which reduces the extrusion of the outer wall of the pipe during the movement of the outer shell, the upper sliding shell and the lower sliding shell, and keeps the distance between the moving plate and the fixed plate and the outer wall surface of the pipe constant, which plays a role in keeping the detection data of the magnetic flux sensor stable at the right-angle turn of the pipe.

[0019] Third, the insertion rod squeezes the slot on the top of the lower sliding shell, driving the insertion rod to slide and squeeze the connecting spring at the same time, driving the linkage frame and the second connecting clip to rotate through the middle bar to open the first connecting clip and the second connecting clip, and the fixed rod enters between the first connecting clip and the second connecting clip, and the slot is deflected, so that the card block is stuck inside the slot, and the insertion rod returns to its original position, and the first connecting clip and the second connecting clip clamp the fixing rod, thereby realizing the connection between the upper sliding shell and the lower sliding shell, and achieving the effect of stably connecting the upper sliding shell and the lower sliding shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the working status of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0021] Figure 2 This is a schematic diagram of the axonometric structure of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0022] Figure 3 This is a schematic diagram of the partial structure of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0023] Figure 4 This is a schematic structural diagram of the second roller of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0024] Figure 5 This is a schematic cross-sectional structure diagram of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0025] Figure 6 This is a schematic diagram of the internal structure of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0026] Figure 7 This is a schematic structural diagram of a rubber tube of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0027] Figure 8 This is a structural schematic diagram of a rolling roller of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0028] Fig. 9 This is a structural schematic diagram of an insertion rod of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0029] Fig.10 This is a schematic diagram of the relationship between the detection position and magnetic flux of the plunger of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0030] Fig.11 This is a schematic diagram of the relationship between stress and magnetic flux of an insertion rod of an oil and gas pipeline stress zone detection device proposed by the present invention.

[0031] In the figure: 1, housing; 2, first handle; 3, pipe; 4, second handle; 5, incision; 6, slit; 7, first motor; 8, moving plate; 9, upper sliding shell; 10, fixed plate; 11, lower sliding shell; 12, magnetic flux sensor; 13, fixed plate; 14, mounting plate; 15, fixed block; 16, first torsion spring; 17, rotating frame; 18, second motor; 19, first roller; 20, connecting plate; 21, guide roller; 22, transmission frame; 23, second torsion spring; 24, third motor; 25, second roller; 26, auxiliary frame; 27, rubber tube; 28, sliding plate; 29 , middle plate; 30, slide rail; 31, first limiting block; 32, second limiting block; 33, auxiliary limiting block; 34, auxiliary stopper; 35, limit block; 36, wire rope; 37, transmission gear; 38, limit frame; 39, third torsion spring; 40, first buffer plate; 41, second buffer plate; 42, connecting block; 43, guide wheel; 44, rolling roller; 45, fixing rod; 46, first connecting clamp; 47, first gear; 48, second gear; 49, linkage frame; 50, middle strip; 51, connecting spring; 52, slot; 53, block; 54, plug rod; 55, second connecting clamp. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] The oil and gas pipeline stress zone detection device disclosed in the present invention is mainly used in general pipeline detection institutions. When performing defect detection, they often rely on manual handheld devices to perform local detection. This method has the problem of low efficiency. Manual operation is easily limited by the detection environment, resulting in a prolonged detection cycle. The error of manual detection is large, and the accuracy of the detection result may be affected by factors such as the operator's experience level and subjective judgment.

[0034] Reference Figure 1 — Fig.11, an oil and gas pipeline stress zone detection device, comprising a shell 1, two slide rails 30 are arranged inside the shell 1, one side of the slide rails 30 is slidably connected with an intermediate plate 29, the intermediate plate 29 is slidably connected with a slide plate 28, an upper slide shell 9 and a lower slide shell 11 are arranged on the outer wall of the slide plate 28, a first limiting block 31 is arranged on one end edge of the slide rail 30, a second limiting block 32 is arranged on the other end edge of the slide rail 30, a limiting block 35 is arranged on one side edge of the intermediate plate 29, an auxiliary stopper 34 is arranged on one side edge of the slide plate 28, an auxiliary limiting block 33 is arranged near the auxiliary stopper 34 on one side edge of the intermediate plate 29, cutouts 5 are arranged on both sides of the shell 1, a slit 6 is arranged near the cutout 5 on one side of the shell 1, a fixed plate 13 is arranged near the slit 6 on one side of the shell 1, a moving plate 8 is arranged on one side of the upper slide shell 9 and the lower slide shell 11, a plurality of magnetic flux sensors 12 are arranged on the surfaces of the moving plate 8 and the fixed plate 13, and a pipeline 3 is arranged at the center of the shell 1; A sliding mechanism is installed on the inner side of the housing 1, and the sliding mechanism enables the housing 1 to slide on the pipe 3; A movement mechanism is installed on one side of the housing 1, and the movement mechanism is used to help move on the pipe 3; A transmission mechanism is installed inside the housing 1, and the transmission mechanism is used to drive the upper sliding housing 9 and the lower sliding housing 11 to move; A connecting mechanism is provided at the connection between the upper sliding shell 9 and the lower sliding shell 11 , and the connecting mechanism is used to connect the upper sliding shell 9 and the lower sliding shell 11 .

[0035] The sliding mechanism includes a plurality of first buffer plates 40 which are rotatably connected to one side of the outer shell 1, the upper sliding shell 9 and the lower sliding shell 11 respectively; one side of the first buffer plate 40 is rotatably connected to a second buffer plate 41; one end of the second buffer plate 41 is rotatably connected to a connecting block 42; one side of the connecting block 42 is rotatably connected to a rolling roller 44; and the outer surface of the rolling roller 44 is rotatably connected to a plurality of guide wheels 43.

[0036] A third torsion spring 39 is provided at the connection between the first buffer plate 40 and the second buffer plate 41. Every two first buffer plates 40 and second buffer plates 41 form a group. The rolling roller 44 is provided between the two second buffer plates 41. The pipeline 3 is located between the plurality of rolling rollers 44. The outer wall of the pipeline 3 contacts the guide wheel 43.

[0037] In this embodiment, the outer shell 1 is sleeved on the pipe 3, and multiple guide wheels 43 are in contact with the outer wall of the pipe 3. By driving the middle plate 29 to slide on the slide rail 30, the sliding plate 28 is driven to slide on the middle plate 29, so that the upper sliding shell 9 and the lower sliding shell 11 are continuously slid forward until the upper sliding shell 9 and the lower sliding shell 11 are in contact. The upper sliding shell 9, the lower sliding shell 11 and the outer shell 1 are connected to form a ring sleeve on the pipe 3. The limit block 35 can only move between the first limit block 31 and the second limit block 32. The auxiliary limit block 33 plays a role in limiting the moving distance of the auxiliary stop block 34. When detecting pipes 3 with different diameters, the guide wheel 43 squeezes the rolling roller 44, so that the rolling roller 44 squeezes the second buffer plate 41 and the first buffer plate 40, so that the first buffer plate 40 and the second buffer plate 41 rotate, and the third torsion spring 39 is twisted, so that the guide wheel 43 always contacts the outer surface of the pipe 3, which has the effect of detecting pipes 3 with different diameters.

[0038] It should be explained that, under the geomagnetic field environment, the magnetic flux signal in the stress concentration area changes with the complex stress of the oil and gas pipeline 3. The experimental data are processed and analyzed to obtain the distribution of the magnetic flux signal on the outer wall of the oil and gas pipeline 3, as shown in the figure. Fig.10 As shown, the axial coordinate is the length of the outer wall of the pipeline 3 and the complex stress, and the longitudinal coordinate is the induced magnetic flux signal, which is the distribution of the magnetic flux signal along the outer wall of the pipeline 3 under different complex stresses in the stress concentration area; The area between 20mm and 40mm is the stress concentration area, and the other areas are the pipelines in normal service 3.

[0039] Among them, it can be seen from the figure that when stress concentration or pipeline 3 damage occurs, the stress affects the magnetization intensity of pipeline 3, and the magnetic flux signal of the detection point of pipeline 3 will suddenly increase; Fig.11 The magnetic flux signal at the stress concentration point changes with stress. When the stress on the outer wall of the pipeline 3 increases, the magnetic flux signal gradually increases. The magnetic flux signal induced by the outer wall of the pipeline 3 shows a nearly linear growth trend as the stress of the pipeline 3 increases. The magnetic flux sensor 12 uses the magnetic flux signal induced by the outer wall of the pipeline 3 to detect defects on the pipeline 3 as the stress of the pipeline 3 increases linearly.

[0040] Furthermore, the function of the guide wheel 43 is that during the movement of the upper sliding shell 9 and the lower sliding shell 11, the guide wheel 43 rotates on the rolling roller 44 to reduce the friction between the rolling roller 44 and the pipe 3. During the movement of the upper sliding shell 9 and the lower sliding shell 11, the moving plate 8 is driven to move, and a complete ring is formed between the moving plate 8 and the fixed plate 13 around the pipe 3. The multiple magnetic flux sensors 12 on the moving plate 8 and the fixed plate 13 detect the outer wall of the pipe 3. The magnetic flux will increase abnormally in the area of ​​stress concentration on the outer wall of the pipe 3. By analyzing the changes in the magnetic flux, defects or cracks on the outer wall of the pipe 3 are detected, thereby achieving the effect of quickly and accurately detecting defects on the pipe 3.

[0041] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 In a preferred embodiment, the motion mechanism includes two mounting plates 14 fixedly connected to the other side of the shell 1, one side of the mounting plate 14 is rotatably connected to a transmission frame 22, one end of the transmission frame 22 is rotatably connected to a guide roller 21, one side of the transmission frame 22 is rotatably connected to a connecting plate 20, two fixed blocks 15 are fixedly connected to one side of the shell 1 near the mounting plate 14, one side of the fixed block 15 is rotatably connected to a rotating frame 17, a first torsion spring 16 is provided at the connection between the rotating frame 17 and the fixed block 15, one end of the rotating frame 17 is fixedly connected to a second motor 18, and one end of the output shaft of the second motor 18 is fixedly connected to a first roller 19.

[0042] The connecting plate 20 is rotationally connected to the rotating frame 17, and two fixed plates 10 are fixedly connected to one side of the upper sliding shell 9 and the lower sliding shell 11 respectively. An auxiliary frame 26 is rotationally connected to one side of the fixed plate 10, and a third motor 24 is fixedly connected to one end of the auxiliary frame 26. A second roller 25 is fixedly connected to one end of the output shaft of the third motor 24. A second torsion spring 23 is arranged between the fixed plate 10 and the auxiliary frame 26. A first handle 2 is fixedly connected to the upper surface of the outer shell 1, and a second handle 4 is fixedly connected to the upper surface of the mounting plate 14.

[0043] In this embodiment, by starting the second motor 18 and the third motor 24, the first roller 19 and the second roller 25 are driven to rotate respectively, and the first roller 19 and the second roller 25 rotate on the surface of the pipe 3. Due to the torsional force of the first torsion spring 16 and the second torsion spring 23, the first roller 19 and the second roller 25 are tightly attached to the outer surface of the pipe 3, thereby driving the outer shell 1, the moving plate 8 and the fixed plate 13 to move on the surface of the pipe 3, so that the outer shell 1, the moving plate 8 and the fixed plate 13 automatically move on the outer wall of the pipe 3.

[0044] Furthermore, when the shell 1 moves to the right-angle turn of the pipe 3, the guide roller 21 first contacts the outer wall of the pipe 3. During the continued movement, the guide roller 21 slides to cause the transmission frame 22 to rotate, and drives the rotating frame 17 and the first roller 19 to move through the connecting plate 20, so that the first roller 19 gradually separates from the outer surface of the pipe 3, so that the side of the shell 1 close to the first roller 19 picks up the power movement speed and reduces, and the second roller 25 continues to rotate to drive the upper sliding shell 9 and the lower sliding shell 11 to continue to move on the outer wall of the pipe 3, so that the speeds of the shell 1, the upper sliding shell 9 and the lower sliding shell 11 on both sides of the right-angle turn of the pipe 3 are different, so that the shell 1, the upper sliding shell 9 and the lower sliding shell 11 turn on the outer surface of the pipe 3, reducing the extrusion of the outer wall of the pipe 3 during the movement of the shell 1, the upper sliding shell 9 and the lower sliding shell 11, so that the distance between the moving plate 8 and the fixed plate 13 and the outer wall surface of the pipe 3 remains constant, which plays an effect of keeping the detection data of the magnetic flux sensor 12 stable at the right-angle turn of the pipe 3.

[0045] Reference Figure 1 , Figure 2 , Figure 3 and Figure 7 In a preferred embodiment, the transmission mechanism includes a plurality of limit frames 38 fixedly connected to the inner wall of the top of the shell 1, a first motor 7 is fixedly connected to a position near the limit frame 38 on one side of the shell 1, a transmission gear 37 is fixedly connected to one end of the output shaft of the first motor 7, a rubber tube 27 is slidably connected inside the limit frame 38, and a steel wire rope 36 is arranged inside the rubber tube 27.

[0046] The material of the rubber tube 27 has a certain elasticity, the material of the wire rope 36 is steel wire, one end of the rubber tube 27 is fixedly connected to one end of the upper sliding shell 9 and the lower sliding shell 11 respectively, and a plurality of convex rings are arranged on the outer wall of the rubber tube 27, which mesh with the transmission gear 37. The rotation of the transmission gear 37 drives the rubber tube 27 to slide inside the limit frame 38, and a baffle is arranged on the inner wall of one side of the outer shell 1 at the bottom position of the transmission gear 37.

[0047] In this embodiment, the transmission gear 37 is driven to rotate by the first motor 7, and the transmission gear 37 drives the rubber tube 27 to slide inside the limit frame 38. The rubber tube 27 drives the upper sliding shell 9 and the lower sliding shell 11 to move. Since the rubber tube 27 is elastic, the rubber tube 27 can bend inside the outer shell 1, so that the rubber tube 27 can reciprocate inside the outer shell 1. The steel wire rope 36 ensures the structural strength of the rubber tube 27 without affecting the elasticity of the rubber tube 27.

[0048] Reference Figure 1 , Figure 2 , Figure 3 and Fig. 9In a preferred embodiment, the connecting mechanism includes a first gear 47 rotatably connected to the inner wall of the bottom end of the upper sliding shell 9, a first connecting clamp 46 is fixedly connected to one side of the first gear 47, a second gear 48 is rotatably connected to the inner wall of the bottom end of the upper sliding shell 9 near the first gear 47, a second connecting clamp 55 is fixedly connected to one side of the second gear 48, a linkage frame 49 is fixedly connected to the top of the second connecting clamp 55, a mounting frame is fixedly connected to the inner wall of the bottom end of the upper sliding shell 9 near the linkage frame 49, and a plug rod 54 is slidably connected to the top of the mounting frame.

[0049] The top of the insertion rod 54 is rotatably connected to the middle bar 50, and the middle bar 50 is rotatably connected to the top of the linkage frame 49. One end of the insertion rod 54 is sleeved with a connecting spring 51, and a card slot 52 is provided at the bottom of the insertion rod 54. A card block 53 is fixedly connected to the top of the lower sliding shell 11, and a second connecting clip 55 is fixedly connected to the top inner wall of the lower sliding shell 11. The position of the second connecting clip 55 is located between the first connecting clip 46 and the second connecting clip 55.

[0050] The first and second connecting clips 46 and 55 are locked in the locking cam 52, and the locking cam 52 is locked in the locking cam 52.

[0051] Working principle: When in use, the outer shell 1 is put on the pipe 3, and the multiple guide wheels 43 are in contact with the outer wall of the pipe 3. By driving the middle plate 29 to slide on the slide rail 30, the sliding plate 28 is driven to slide on the middle plate 29, so that the upper sliding shell 9 and the lower sliding shell 11 continue to slide forward until the upper sliding shell 9 and the lower sliding shell 11 are in contact. The upper sliding shell 9, the lower sliding shell 11 and the outer shell 1 are connected to form a ring on the pipe 3. The limit block 35 can only move between the first limit block 31 and the second limit block 32, and the auxiliary limit block 33 plays a limiting role. The auxiliary stopper 34 moves a distance. When detecting pipes 3 with different diameters, the guide wheel 43 squeezes the rolling roller 44, so that the rolling roller 44 squeezes the second buffer plate 41 and the first buffer plate 40, so that the first buffer plate 40 and the second buffer plate 41 rotate, and the third torsion spring 39 is twisted, so that the guide wheel 43 always contacts the outer surface of the pipe 3, which has the effect of detecting pipes 3 with different diameters. The function of the guide wheel 43 is that during the movement of the upper sliding shell 9 and the lower sliding shell 11, the guide wheel 43 rotates on the rolling roller 44 to reduce the friction between the rolling roller 44 and the pipe 3. During the movement of the upper sliding shell 9 and the lower sliding shell 11, the moving plate 8 is driven to move, and a complete ring is formed between the moving plate 8 and the fixed plate 13 around the pipe 3. The multiple magnetic flux sensors 12 on the moving plate 8 and the fixed plate 13 detect the outer wall of the pipe 3. In the area where stress is concentrated on the outer wall of the pipe 3, the magnetic flux will increase abnormally. By analyzing the change of the magnetic flux, defects or cracks on the outer wall of the pipe 3 are detected, which has the effect of quickly and accurately detecting defects on the pipe 3. The first motor 7 drives the sensor The moving gear 37 rotates, and the transmission gear 37 drives the rubber tube 27 to slide inside the limit frame 38. The rubber tube 27 drives the upper sliding shell 9 and the lower sliding shell 11 to move. Since the rubber tube 27 has elasticity, the rubber tube 27 can bend inside the shell 1, so that the rubber tube 27 can reciprocate inside the shell 1. The steel wire rope 36 ensures the structural strength of the rubber tube 27 and does not affect the elasticity of the rubber tube 27. In the process of contact between the upper sliding shell 9 and the lower sliding shell 11, the insertion rod 54 squeezes the card slot 52 at the top of the lower sliding shell 11.The insertion rod 54 is driven to slide and squeeze the connecting spring 51 at the same time, and the linkage frame 49 and the second connecting clip 55 are driven to rotate through the middle bar 50, thereby driving the second gear 48 and the first gear 47 to rotate relatively, so that the first connecting clip 46 and the second connecting clip 55 are opened, and the fixing rod 45 enters between the first connecting clip 46 and the second connecting clip 55. The material of the card slot 52 is elastic copper metal, and the card slot 52 is deflected, so that the card block 53 is stuck inside the card slot 52, and the insertion rod 54 returns to its original position, and the first connecting clip 46 and the second connecting clip 55 fix the fixing rod 4 5 is stuck, and the connection between the upper sliding shell 9 and the lower sliding shell 11 is realized, which plays the effect of stably connecting the upper sliding shell 9 and the lower sliding shell 11. By starting the second motor 18 and the third motor 24, the first roller 19 and the second roller 25 are driven to rotate respectively. The first roller 19 and the second roller 25 rotate on the surface of the pipe 3. Due to the torsional force of the first torsion spring 16 and the second torsion spring 23, the first roller 19 and the second roller 25 are closely attached to the outer surface of the pipe 3, thereby driving the housing 1, the moving plate 8 and the fixed plate 13 to rotate on the pipe 3. The outer surface moves, which has the effect of automatically moving the housing 1, the moving plate 8 and the fixed plate 13 on the outer wall of the pipe 3. When the housing 1 moves to the right-angle bend of the pipe 3, the guide roller 21 first contacts the outer wall of the pipe 3. In the process of continuing to move, the guide roller 21 slides to make the transmission frame 22 rotate, and drives the rotating frame 17 and the first roller 19 to move through the connecting plate 20, so that the first roller 19 gradually separates from the outer surface of the pipe 3, so that the side of the housing 1 close to the first roller 19 picks up the power movement speed to reduce, and the second roller 25 continues to rotate to drive The upper sliding shell 9 and the lower sliding shell 11 continue to move on the outer wall of the pipe 3, so that the outer shell 1, the upper sliding shell 9 and the lower sliding shell 11 have different speeds on both sides of the right-angle bend of the pipe 3, so that the outer shell 1, the upper sliding shell 9 and the lower sliding shell 11 turn on the outer surface of the pipe 3, reducing the extrusion of the outer wall of the pipe 3 during the movement of the outer shell 1, the upper sliding shell 9 and the lower sliding shell 11, so that the distance between the moving plate 8 and the fixed plate 13 and the outer wall surface of the pipe 3 remains constant, which plays a role in keeping the detection data of the magnetic flux sensor 12 stable at the right-angle bend of the pipe 3.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An oil and gas pipeline stress zone detection device, comprising a housing (1), characterized in that: Two slide rails (30) are arranged inside the housing (1), one side of the slide rails (30) is slidably connected to an intermediate plate (29), the interior of the intermediate plate (29) is slidably connected to a sliding plate (28), an upper sliding shell (9) and a lower sliding shell (11) are arranged on the outer wall of the sliding plate (28), one end edge of the slide rail (30) is provided with a first limiting block (31), the other end edge of the slide rail (30) is provided with a second limiting block (32), one side edge of the intermediate plate (29) is provided with a limiting block (35), one side edge of the sliding plate (28) is provided with an auxiliary stopper (34), one side edge of the intermediate plate (29) is close to the auxiliary stopper (35), and one side edge of the intermediate plate (29) is provided with a first limiting block (31). An auxiliary limiting block (33) is arranged at the position of the auxiliary stopper (34), notches (5) are arranged on both sides of the shell (1), a slit (6) is arranged on one side of the shell (1) near the notch (5), a fixing plate (13) is arranged on one side of the shell (1) near the slit (6), a moving plate (8) is arranged on one side of the upper sliding shell (9) and a moving plate (8) are arranged on one side of the lower sliding shell (11), a plurality of magnetic flux sensors (12) are arranged on the surfaces of the moving plate (8) and the fixing plate (13), a pipe (3) is arranged at the center of the shell (1), and a moving mechanism is installed on one side of the shell (1), the moving mechanism is used to help movement on the pipe (3).

2. The oil and gas pipeline stress zone detection device according to claim 1, characterized in that: A sliding mechanism is installed on the inner side of the outer shell (1), and the sliding mechanism comprises a plurality of first buffer plates (40) rotatably connected to one side of the outer shell (1), the upper sliding shell (9) and the lower sliding shell (11), one side of the first buffer plate (40) is rotatably connected to a second buffer plate (41), one end of the second buffer plate (41) is rotatably connected to a connecting block (42), one side of the connecting block (42) is rotatably connected to a rolling roller (44), and the outer surface of the rolling roller (44) is rotatably connected to a plurality of guide wheels (43).

3. The oil and gas pipeline stress zone detection device according to claim 2 is characterized in that: A third torsion spring (39) is provided at the connection between the first buffer plate (40) and the second buffer plate (41); every two first buffer plates (40) and second buffer plates (41) form a group; the rolling roller (44) is provided between the two second buffer plates (41); the pipeline (3) is located between the plurality of rolling rollers (44); and the outer wall of the pipeline (3) is in contact with the guide wheel (43).

4. The oil and gas pipeline stress zone detection device according to claim 3 is characterized in that: The motion mechanism comprises two mounting plates (14) fixedly connected to the other side of the housing (1); one side of the mounting plates (14) is rotatably connected to a transmission frame (22); one end of the transmission frame (22) is rotatably connected to a guide roller (21); one side of the transmission frame (22) is rotatably connected to a connecting plate (20); two fixed blocks (15) are fixedly connected to one side of the housing (1) near the mounting plates (14); one side of the fixed blocks (15) is rotatably connected to a rotating frame (17); a first torsion spring (16) is provided at a connection between the rotating frame (17) and the fixed blocks (15); one end of the rotating frame (17) is fixedly connected to a second motor (18); and one end of an output shaft of the second motor (18) is fixedly connected to a first roller (19).

5. The oil and gas pipeline stress zone detection device according to claim 4, characterized in that: The connecting plate (20) is rotatably connected to the rotating frame (17); one side of the upper sliding shell (9) and the lower sliding shell (11) are respectively fixedly connected to two fixing plates (10); one side of the fixing plate (10) is rotatably connected to an auxiliary frame (26); one end of the auxiliary frame (26) is fixedly connected to a third motor (24); one end of an output shaft of the third motor (24) is fixedly connected to a second roller (25); a second torsion spring (23) is provided between the fixing plate (10) and the auxiliary frame (26); a first handle (2) is fixedly connected to the upper surface of the housing (1); and a second handle (4) is fixedly connected to the upper surface of the mounting plate (14).

6. The oil and gas pipeline stress zone detection device according to claim 5, characterized in that: A transmission mechanism is installed inside the housing (1), and the transmission mechanism comprises a plurality of limit frames (38) fixedly connected to the inner wall of the top of the housing (1); a first motor (7) is fixedly connected to a position close to the limit frame (38) on one side of the housing (1); a transmission gear (37) is fixedly connected to one end of an output shaft of the first motor (7); a rubber tube (27) is slidably connected to the inside of the limit frame (38); and a steel wire rope (36) is arranged inside the rubber tube (27).

7. The oil and gas pipeline stress zone detection device according to claim 6, characterized in that: The material of the rubber tube (27) has a certain elasticity, the material of (3) is steel wire, one end of the rubber tube (27) is fixedly connected to one end of the upper sliding shell (9) and the lower sliding shell (11), a plurality of convex rings are arranged on the outer wall of the rubber tube (27), the convex rings are meshed with the transmission gear (37), the transmission gear (37) rotates to drive the rubber tube (27) to slide inside the limit frame (38), and a baffle is arranged on the inner wall of one side of the shell (1) at the bottom position of the transmission gear (37).

8. The oil and gas pipeline stress zone detection device according to claim 7, characterized in that: A connecting mechanism is provided at the connection between the upper sliding shell (9) and the lower sliding shell (11), the connecting mechanism comprising a first gear (47) rotatably connected to the inner wall of the bottom end of the upper sliding shell (9), a first connecting clamp (46) fixedly connected to one side of the first gear (47), a second gear (48) rotatably connected to the inner wall of the bottom end of the upper sliding shell (9) near the first gear (47), a second connecting clamp (55) fixedly connected to one side of the second gear (48), a linkage frame (49) fixedly connected to the top of the second connecting clamp (55), a mounting frame fixedly connected to the inner wall of the bottom end of the upper sliding shell (9) near the linkage frame (49), and a plug rod (54) slidably connected to the top of the mounting frame.

9. The oil and gas pipeline stress zone detection device according to claim 8, characterized in that: The top of the insertion rod (54) is rotatably connected to a middle bar (50), and the middle bar (50) is rotatably connected to the top of the linkage frame (49). One end of the insertion rod (54) is sleeved with a connection spring (51), and a clamping groove (52) is provided at the bottom of the insertion rod (54). A clamping block (53) is fixedly connected to the top of the lower sliding shell (11), and a second connecting clip (55) is fixedly connected to the inner wall of the top of the lower sliding shell (11), and the second connecting clip (55) is located between the first connecting clip (46) and the second connecting clip (55).

10. A detection method for oil and gas pipeline stress zone detection equipment, characterized in that: Based on the oil and gas pipeline stress zone detection device according to claim 9, the detection method comprises the following steps: S1. Preparation: The outer shell (1) is placed on the pipe (3), and the plurality of guide wheels (43) are in contact with the outer wall of the pipe (3). The middle plate (29) is driven to slide on the slide rail (30), and the sliding plate (28) is driven to slide on the middle plate (29), so that the upper sliding shell (9) and the lower sliding shell (11) are continuously slid forward until the upper sliding shell (9) and the lower sliding shell (11) are in contact, and the upper sliding shell (9), the lower sliding shell (11) and the outer shell (1) are connected to form a ring and placed on the pipe (3); S2, connection: during the contact between the upper sliding shell (9) and the lower sliding shell (11), the insertion rod (54) presses the slot (52) at the top of the lower sliding shell (11), driving the insertion rod (54) to slide and simultaneously press the connecting spring (51), thereby driving the second gear (48) and the first gear (47) to rotate relative to each other, and the fixing rod (45) enters between the first connecting clip (46) and the second connecting clip (55), so that the block (53) is stuck inside the slot (52), and the insertion rod (54) returns to the original position, and the first connecting clip (46) and the second connecting clip (55) clamp the fixing rod (45), thereby realizing the connection between the upper sliding shell (9) and the lower sliding shell (11); S3, detection: during the movement of the upper sliding shell (9) and the lower sliding shell (11), the moving plate (8) is driven to move, and a complete ring is formed between the moving plate (8) and the fixed plate (13) around the pipe (3). The plurality of magnetic flux sensors (12) on the moving plate (8) and the fixed plate (13) detect the outer wall of the pipe (3). In the area where stress is concentrated on the outer wall of the pipe (3), the magnetic flux will increase abnormally. By analyzing the change in the magnetic flux, defects or cracks on the outer wall of the pipe (3) are detected; S4, turning: When the housing (1) moves to the right-angle bend of the pipeline (3), the guide roller (21) slides to cause the transmission frame (22) to rotate, thereby causing the first roller (19) to gradually separate from the outer surface of the pipeline (3), so that the speed of the power movement on the side of the housing (1) close to the first roller (19) is reduced, so that the speeds of the housing (1), the upper sliding housing (9) and the lower sliding housing (11) on both sides of the right-angle bend of the pipeline (3) are different, so that the housing (1), the upper sliding housing (9) and the lower sliding housing (11) turn on the outer surface of the pipeline (3).

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