An oil and gas pipeline stress area detection device and its detection method

Abstract

The present invention discloses an oil and gas pipeline stress area detection device and its detection method, which relates to the technical field of pipeline stress detection. It includes a housing, and two slide rails are arranged inside the housing. Intermediate plates are respectively slidably connected to one side of the slide rails. A sliding plate is slidably connected inside the intermediate plate. Upper sliding shells and lower sliding shells are respectively arranged on the outer walls of the sliding plates. A first limiting block is arranged at the edge of one end of the slide rail, and a second limiting block is arranged at the edge of the other end of the slide rail. A limiting block is arranged at the edge of one side of the intermediate plate. In the oil and gas pipeline stress area detection device disclosed by the present invention, a complete ring is formed between the moving plate and the fixed plate to surround the pipeline in a circle. Multiple magnetic flux sensors on the moving plate and the fixed plate detect the outer wall of the pipeline. For the area with stress concentration on the outer wall of the pipeline, by analyzing the change of the magnetic flux, defects or cracks on the outer wall of the pipeline are detected, achieving the effect of quickly and accurately detecting defects on the pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline stress detection, and particularly to a detection device and a detection method for stress areas of oil and gas pipelines. Background Art

[0002] Pipeline defect detection technology has been widely applied in industries such as petroleum, natural gas, and water conservancy, aiming to ensure the safe operation of pipelines and extend their service life. With the progress of technology, various detection methods have been continuously developed, evolving from the initial manual visual inspection and simple measurement to today's high-tech detection means, such as ultrasonic detection, magnetic particle detection, and intelligent robot detection. In particular, in recent years, pipeline monitoring systems based on Internet of Things and artificial intelligence technologies have gradually emerged, capable of realizing real-time monitoring and data analysis.

[0003] With the continuous progress of modern pipeline detection technology, general pipeline detection agencies often rely on manually held devices for local detection during defect detection. This method has the problem of low efficiency. Manual operation is easily limited by the detection environment, resulting in an extended detection cycle. The error of manual detection is relatively large, and the accuracy of the detection results may be affected by factors such as the experience level and subjective judgment of the operators. Manual detection requires a large amount of manpower, increasing the overall detection cost, restricting the timeliness and economy of pipeline detection, and unable to meet the actual needs. Summary of the Invention

[0004] The present invention discloses a detection device and a detection method for stress areas of oil and gas pipelines, aiming to solve the technical problems that general pipeline detection agencies often rely on manually held devices for local detection during defect detection, which has the problem of low efficiency, manual operation is easily limited by the detection environment, resulting in an extended detection cycle, the error of manual detection is relatively large, and the accuracy of the detection results may be affected by factors such as the experience level and subjective judgment of the operators.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An oil and gas pipeline stress area detection device, including a housing, two slide rails are arranged inside the housing, intermediate plates are respectively slidably connected to one side of the slide rails, a sliding plate is slidably connected inside the intermediate plates, upper sliding shells and lower sliding shells are respectively arranged on the outer wall of the sliding plate, a first limiting block is arranged at the edge of one end of the slide rail, a second limiting block is arranged at the edge of the other end of the slide rail, a limiting block is arranged at the edge of one side of the intermediate plate, an auxiliary blocking block is arranged at the edge of one side of the sliding plate, an auxiliary limiting block is arranged at a position on one side of the intermediate plate close to the auxiliary blocking block, cutouts are respectively arranged on both sides of the housing, a cut seam is arranged at a position on one side of the housing close to the cutout, a fixing plate is arranged at a position on one side of the housing close to the cut seam, moving plates are respectively arranged on one side of the upper sliding shell and the lower sliding shell, a plurality of magnetic flux sensors are arranged on the surfaces of the moving plate and the fixing plate, and a pipeline is arranged at the center position of the housing;

[0007] A sliding mechanism is installed inside the housing, and the sliding mechanism enables the housing to slide on the pipeline.

[0008] A moving mechanism is installed on one side of the housing, and the moving mechanism is used to assist in moving on the pipeline;

[0009] A transmission mechanism is installed inside the housing, and the transmission mechanism is used to drive the upper sliding shell and the lower sliding shell to move;

[0010] A connecting mechanism is arranged at the connection of 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.

[0011] The sliding mechanism includes a plurality of first buffer plates respectively rotatably connected to one side of the housing, the upper sliding shell and the lower sliding shell, a second buffer plate is rotatably connected to one side of the first buffer plate, a connecting block is rotatably connected to one end of the second buffer plate, a rolling roller is rotatably connected to one side of the connecting block, and a plurality of guide wheels are rotatably connected to the outer surface of the rolling roller.

[0012] A third torsion spring is arranged at the connection of the first buffer plate and the second buffer plate, each two first buffer plates and second buffer plates form a group, the rolling roller is arranged between the two second buffer plates, the pipeline is located between the plurality of rolling rollers, and the outer wall of the pipeline contacts the guide wheels.

[0013] In a preferred embodiment, the motion mechanism includes two mounting plates fixedly connected to the other side of the housing. One side of each mounting plate 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 fixing blocks are fixedly connected to the housing near the mounting plates. One side of each fixing block is rotatably connected to a rotating frame. A first torsion spring is provided at the connection between the rotating frame and the fixing block. One end of the rotating frame is fixedly connected to a second motor. One end of the output shaft of the second motor is fixedly connected to a first roller.

[0014] The connecting plate is rotatably connected to the rotating frame. Two fixing pieces are respectively fixedly connected to one side of the upper sliding shell and the lower sliding shell. One side of each fixing piece is rotatably connected to an auxiliary frame. One end of the auxiliary frame is fixedly connected to a third motor. One end of the output shaft of the third motor is fixedly connected to a second roller. A second torsion spring is provided between the fixing piece and the auxiliary frame. A first handle is fixedly connected to the upper surface of the housing. A second handle is fixedly connected to the upper surface of the mounting plate.

[0015] In a preferred embodiment, the transmission mechanism includes a plurality of limiting frames fixedly connected to the inner wall of the top of the housing. A first motor is fixedly connected to the housing near the limiting frames. One end of the output shaft of the first motor is fixedly connected to a transmission gear. A rubber tube is slidably connected inside the limiting frame. A steel wire rope is provided inside the rubber tube.

[0016] The material of the rubber tube is elastic. The material of the steel wire rope 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 provided on the outer wall of the rubber tube. The convex rings are engaged with the transmission gear. The rotation of the transmission gear drives the rubber tube to slide inside the limiting frame. A baffle is provided on the inner wall of the housing at the bottom position of the transmission gear.

[0017] In a preferred embodiment, the connection mechanism includes a first gear rotatably connected to the inner wall of the bottom end of the upper sliding shell. A first connecting clip is fixedly connected to one side of the first gear. A second gear is rotatably connected to the inner wall of the bottom end of the upper sliding shell near the first gear. A second connecting clip is fixedly connected to one side of the second gear. A linkage frame is fixedly connected to the top of the second connecting clip. A plug rod is slidably connected to the top of the mounting frame fixedly connected to the inner wall of the bottom end of the upper sliding shell near the linkage frame.

[0018] 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.

[0019] A detection method for an oil and gas pipeline stress zone detection device comprises the following steps:

[0020] 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;

[0021] 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;

[0022] 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;

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Second: The connecting plate drives the rotating frame and the first roller to move, so that the first roller gradually disengages from the outer surface of the pipeline, reducing the picking power movement speed on the side of the housing close to the first roller. The second roller continues to rotate and drives the upper sliding shell and the lower sliding shell to continue moving on the outer wall of the pipeline, causing the speeds of the housing, the upper sliding shell, and the lower sliding shell on both sides of the right-angle bend of the pipeline to be different, reducing the extrusion of the outer wall of the pipeline during the movement of the housing, the upper sliding shell, and the lower sliding shell, and keeping the distance between the moving plate and the fixing plate and the outer wall surface of the pipeline constant, achieving the effect of maintaining the stability of the detection data of the magnetic flux sensor at the right-angle bend of the pipeline.

[0027] Third: The insertion rod squeezes the card slot at the top of the lower sliding shell, drives the insertion rod to slide and simultaneously squeezes the connecting spring. Through the middle strip, the linkage frame and the second connecting clip are driven to rotate, causing the first connecting clip and the second connecting clip to open. The fixing rod enters between the first connecting clip and the second connecting clip, the card slot deflects, the block is stuck inside the card slot, the insertion rod returns to its original position, and the first connecting clip and the second connecting clip clamp the fixing rod, realizing the connection between the upper sliding shell and the lower sliding shell, achieving the effect of stably connecting the upper sliding shell and the lower sliding shell. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the working state of a detection device for stress areas of oil and gas pipelines proposed by the present invention.

[0029] Figure 2 It is an isometric structural schematic diagram of a detection device for stress areas of oil and gas pipelines proposed by the present invention.

[0030] Figure 3 It is a partial structural schematic diagram of a detection device for stress areas of oil and gas pipelines proposed by the present invention.

[0031] Figure 4 It is a structural schematic diagram of the second roller of a detection device for stress areas of oil and gas pipelines proposed by the present invention.

[0032] Figure 5 It is a cross-sectional structural schematic diagram of a detection device for stress areas of oil and gas pipelines proposed by the present invention.

[0033] Figure 6 It is an internal structural schematic diagram of a detection device for stress areas of oil and gas pipelines proposed by the present invention.

[0034] Figure 7 It is a structural schematic diagram of the rubber tube of a detection device for stress areas of oil and gas pipelines proposed by the present invention.

[0035] Figure 8 It is a structural schematic diagram of the rolling roller of a detection device for stress areas of oil and gas pipelines proposed by the present invention.

[0036] Figure 9 The structural schematic diagram of the insertion rod of a detection device for stress areas of oil and gas pipelines proposed by the present invention.

[0037] Figure 10 The schematic diagram of the relationship between the detection position of the insertion rod of a detection device for stress areas of oil and gas pipelines proposed by the present invention and the magnetic flux.

[0038] Figure 11 The schematic diagram of the relationship between the stress and the magnetic flux of the insertion rod of a detection device for stress areas of oil and gas pipelines proposed by the present invention.

[0039] In the figure: 1. Outer shell; 2. First handle; 3. Pipeline; 4. Second handle; 5. Cut; 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. Intermediate plate; 30. Slide rail; 31. First limiting block; 32. Second limiting block; 33. Auxiliary limiting block; 34. Auxiliary stop block; 35. Limiting block; 36. Steel wire rope; 37. Transmission gear; 38. Limiting frame; 39. Third torsion spring; 40. First buffer plate; 41. Second buffer plate; 42. Connecting block; 43. Guide wheel; 44. Rolling roller; 45. Fixed rod; 46. First connecting clip; 47. First gear; 48. Second gear; 49. Linkage frame; 50. Intermediate bar; 51. Connecting spring; 52. Card slot; 53. Card block; 54. Insertion rod; 55. Second connecting clip. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0041] A detection device for stress areas of oil and gas pipelines disclosed by the present invention is mainly applied to the scenario where general pipeline detection institutions often rely on manual operation of equipment for local detection during defect detection. This method has the problems of low efficiency. Manual operation is easily limited by the detection environment, resulting in an extended detection cycle. The error of manual detection is relatively large, and the accuracy of the detection result may be affected by factors such as the experience level and subjective judgment of the operator.

[0042] Refer to Figure 1 — Figure 11, An oil and gas pipeline stress area detection device, including a housing 1. Inside the housing 1, there are two slide rails 30. On one side of each slide rail 30, an intermediate plate 29 is slidably connected. Inside the intermediate plate 29, a sliding plate 28 is slidably connected. On the outer wall of the sliding plate 28, an upper sliding shell 9 and a lower sliding shell 11 are respectively arranged. At one end edge of the slide rail 30, a first limiting block 31 is provided. At the other end edge of the slide rail 30, a second limiting block 32 is provided. At one side edge of the intermediate plate 29, a limiting block 35 is provided. At one side edge of the sliding plate 28, an auxiliary blocking block 34 is provided. At a position on one side edge of the intermediate plate 29 close to the auxiliary blocking block 34, an auxiliary limiting block 33 is provided. On both sides of the housing 1, there are respectively cuts 5. At a position on one side of the housing 1 close to the cut 5, a cut seam 6 is provided. At a position on one side of the housing 1 close to the cut seam 6, a fixing plate 13 is provided. On one side of the upper sliding shell 9 and the lower sliding shell 11, a moving plate 8 is respectively arranged. On the surfaces of the moving plate 8 and the fixing plate 13, a plurality of magnetic flux sensors 12 are provided. At the central position of the housing 1, there is a pipeline 3;

[0043] A sliding mechanism is installed inside the housing 1, and the sliding mechanism enables the housing 1 to slide on the pipeline 3;

[0044] A moving mechanism is installed on one side of the housing 1, and the moving mechanism is used to assist in moving on the pipeline 3;

[0045] A transmission mechanism is installed inside the housing 1, and the transmission mechanism is used to drive the upper sliding shell 9 and the lower sliding shell 11 to move;

[0046] 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.

[0047] The sliding mechanism includes a plurality of first buffer plates 40 respectively rotatably connected to one side of the housing 1, the upper sliding shell 9 and the lower sliding shell 11. On one side of the first buffer plate 40, a second buffer plate 41 is rotatably connected. At one end of the second buffer plate 41, a connecting block 42 is rotatably connected. On one side of the connecting block 42, a rolling roller 44 is rotatably connected. On the outer surface of the rolling roller 44, a plurality of guide wheels 43 are rotatably connected.

[0048] 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 arranged 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 contacts the guide wheels 43.

[0049] In this embodiment, the outer shell 1 is sleeved on the pipeline 3. A plurality of guide wheels 43 are in contact with the outer wall of the pipeline 3. By driving the intermediate plate 29 to slide on the slide rail 30 and simultaneously driving the sliding plate 28 to slide on the intermediate plate 29, 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 come into contact. The upper sliding shell 9, the lower sliding shell 11 and the outer shell 1 are connected into a ring and sleeved on the pipeline 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 functions to limit the moving distance of the auxiliary stop block 34. When detecting pipelines 3 with different diameters, the guide wheel 43 presses the rolling roller 44, causing the rolling roller 44 to press the second buffer plate 41 and the first buffer plate 40, causing the first buffer plate 40 and the second buffer plate 41 to rotate and twisting the third torsion spring 39, so that the guide wheel 43 always contacts the outer surface of the pipeline 3, achieving the effect of detecting pipelines 3 with different diameters.

[0050] It should be noted that in the geomagnetic field environment, the change of the magnetic flux signal in the stress concentration area with the complex stress of the oil and gas pipeline 3 was studied. The experimental data was processed and analyzed to obtain the distribution of the magnetic flux signal on the outer wall of the oil and gas pipeline 3, as Figure 10 shown. The axial coordinate is the outer wall length and complex stress of the pipeline 3, and the longitudinal coordinate is the induced magnetic flux signal. It 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;

[0051] The range between 20 mm and 40 mm is the stress concentration area, and other areas are the pipelines 3 in normal service.

[0052] Among them, it can be seen from the figure that when phenomena such as stress concentration or pipeline 3 breakage occur, the stress affects the magnetization intensity of the pipeline 3, and the magnetic flux signal at the detection point of the pipeline 3 will suddenly increase; Figure 11 It is the change law of the magnetic flux signal at the stress concentration point 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 on the outer wall of the pipeline 3 shows an almost linear growth trend with the increase of the stress of the pipeline 3. The flux sensor 12 detects the defects on the pipeline 3 by using the linear growth of the magnetic flux signal induced on the outer wall of the pipeline 3 with the stress of the pipeline 3.

[0053] Further, 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, reducing the friction between the rolling roller 44 and the pipeline 3. During the movement of the upper sliding shell 9 and the lower sliding shell 11, the movement plate 8 is driven to move. A complete ring is formed between the movement plate 8 and the fixed plate 13 around the pipeline 3. Multiple magnetic flux sensors 12 on the movement plate 8 and the fixed plate 13 detect the outer wall of the pipeline 3. In the area where stress concentration occurs on the outer wall of the pipeline 3, the magnetic flux will increase abnormally. By analyzing the change of the magnetic flux, defects or cracks on the outer wall of the pipeline 3 are detected, achieving the effect of quickly and accurately detecting defects on the pipeline 3.

[0054] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , in a preferred embodiment, the movement mechanism includes two mounting plates 14 fixedly connected to the other side of the housing 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 fixing blocks 15 are fixedly connected to the side of the housing 1 near the mounting plate 14. One side of the fixing 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 fixing block 15. One end of the rotating frame 17 is fixedly connected to a second motor 18. One end of the output shaft of the second motor 18 is fixedly connected to a first roller 19.

[0055] The connecting plate 20 is rotatably connected to the rotating frame 17. Two fixing pieces 10 are respectively fixedly connected to one side of the upper sliding shell 9 and the lower sliding shell 11. One side of the fixing piece 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 the 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 piece 10 and the auxiliary frame 26. A first handle 2 is fixedly connected to the upper surface of the housing 1. A second handle 4 is fixedly connected to the upper surface of the mounting plate 14.

[0056] In this embodiment, by starting the second motor 18 and the third motor 24, the first roller 19 and the second roller 25 are respectively driven to rotate. The first roller 19 and the second roller 25 rotate on the surface of the pipeline 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 pipeline 3, thereby driving the housing 1, the movement plate 8 and the fixed plate 13 to move on the surface of the pipeline 3, achieving the effect that the housing 1, the movement plate 8 and the fixed plate 13 automatically move on the outer wall of the pipeline 3.

[0057] Further, when the outer shell 1 moves to the right-angle bend of the pipeline 3, the guiding roller 21 first contacts the outer wall of the pipeline 3. During the continuous movement, the guiding roller 21 slides to cause the transmission frame 22 to rotate, driving the rotating frame 17 and the first roller 19 to move through the connecting plate 20, so that the first roller 19 gradually disengages from the outer surface of the pipeline 3, reducing the picking power movement speed of the side of the outer shell 1 close to the first roller 19. The second roller 25 continues to rotate to drive the upper sliding shell 9 and the lower sliding shell 11 to continue moving on the outer wall of the pipeline 3, causing the speeds of the outer shell 1, the upper sliding shell 9, and the lower sliding shell 11 to be different on both sides of the right-angle bend of the pipeline 3, enabling the outer shell 1, the upper sliding shell 9, and the lower sliding shell 11 to turn on the outer surface of the pipeline 3, reducing the extrusion of the outer wall of the pipeline 3 during the movement of the outer shell 1, the upper sliding shell 9, and the lower sliding shell 11, and keeping the distances between the moving plate 8 and the fixing plate 13 and the outer wall surface of the pipeline 3 constant, achieving the effect of maintaining the stability of the detection data of the magnetic flux sensor 12 at the right-angle bend of the pipeline 3.

[0058] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 7 , in a preferred embodiment, the transmission mechanism includes a plurality of limiting frames 38 fixedly connected to the inner wall of the top of the outer shell 1. A first motor 7 is fixedly connected to a position on one side of the outer shell 1 close to the limiting frame 38. One end of the output shaft of the first motor 7 is fixedly connected to a transmission gear 37. A rubber tube 27 is slidably connected inside the limiting frame 38, and a steel wire rope 36 is arranged inside the rubber tube 27.

[0059] The material of the rubber tube 27 is elastic, and the material of the steel wire rope 36 is steel wire. One end of the rubber tube 27 is fixedly connected to one end of each 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, and the convex rings are engaged with the transmission gear 37. The rotation of the transmission gear 37 drives the rubber tube 27 to slide inside the limiting frame 38. A baffle is arranged at the bottom position of the transmission gear 37 on the inner wall of one side of the outer shell 1.

[0060] In this embodiment, the first motor 7 drives the transmission gear 37 to rotate, the transmission gear 37 drives the rubber tube 27 to slide inside the limiting frame 38, and 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, enabling the rubber tube 27 to 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.

[0061] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 9, in a preferred embodiment, the connecting mechanism includes a first gear 47 rotatably connected to the inner bottom wall of the upper sliding shell 9. One side of the first gear 47 is fixedly connected to a first connecting clip 46. A second gear 48 is rotatably connected to the inner bottom wall of the upper sliding shell 9 near the first gear 47. One side of the second gear 48 is fixedly connected to a second connecting clip 55. The top of the second connecting clip 55 is fixedly connected to a linkage bracket 49. An installation bracket is fixedly connected to the inner bottom wall of the upper sliding shell 9 near the linkage bracket 49. A plug rod 54 is slidably connected to the top of the installation bracket.

[0062] The top end of the plug rod 54 is rotatably connected to an intermediate bar 50. The intermediate bar 50 is rotatably connected to the top of the linkage bracket 49. One end of the plug rod 54 is sleeved with a connecting spring 51. A clamping groove 52 is provided at the bottom of the plug rod 54. A clamping block 53 is fixedly connected to the top of the lower sliding shell 11. A second connecting clip 55 is fixedly connected to the inner top wall of the lower sliding shell 11. The position of the second connecting clip 55 is between the first connecting clip 46 and the second connecting clip 55.

[0063] In this embodiment, during the process of the upper sliding shell 9 and the lower sliding shell 11 coming into contact, the plug rod 54 presses the clamping groove 52 at the top of the lower sliding shell 11, driving the plug rod 54 to slide while compressing the connecting spring 51. The intermediate bar 50 drives the linkage bracket 49 and the second connecting clip 55 to rotate, thereby driving the second gear 48 and the first gear 47 to rotate relative to each other, causing the first connecting clip 46 and the second connecting clip 55 to open. The fixing rod 45 enters between the first connecting clip 46 and the second connecting clip 55. The material of the clamping groove 52 is elastic copper metal. The clamping groove 52 deflects, causing the clamping block 53 to be stuck inside the clamping groove 52. The plug rod 54 returns to its original position, and the first connecting clip 46 and the second connecting clip 55 clamp the fixing rod 45, realizing the connection between the upper sliding shell 9 and the lower sliding shell 11, and achieving the effect of stably connecting the upper sliding shell 9 and the lower sliding shell 11.

[0064] Working principle: When in use, the outer shell 1 is sleeved on the pipeline 3. Multiple guide wheels 43 are in contact with the outer wall of the pipeline 3. By driving the intermediate plate 29 to slide on the slide rail 30 and simultaneously driving the sliding plate 28 to slide on the intermediate plate 29, the upper sliding shell 9 and the lower sliding shell 11 continuously slide forward until the upper sliding shell 9 and the lower sliding shell 11 come into contact. The upper sliding shell 9, the lower sliding shell 11 and the outer shell 1 are connected into a ring and sleeved on the pipeline 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 functions to limit the moving distance of the auxiliary stop block 34. When detecting pipelines 3 with different diameters, the guide wheel 43 squeezes the rolling roller 44, causing the rolling roller 44 to squeeze the second buffer plate 41 and the first buffer plate 40, making the first buffer plate 40 and the second buffer plate 41 rotate and twisting the third torsion spring 39, so that the guide wheel 43 always contacts the outer surface of the pipeline 3, achieving the effect of detecting pipelines 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, reducing the friction between the rolling roller 44 and the pipeline 3. During the movement of the upper sliding shell 9 and the lower sliding shell 11, the moving plate 8 is driven to move. A complete ring is formed between the moving plate 8 and the fixed plate 13 around the pipeline 3. Multiple magnetic flux sensors 12 on the moving plate 8 and the fixed plate 13 detect the outer wall of the pipeline 3. In the area where stress concentration occurs on the outer wall of the pipeline 3, the magnetic flux will increase abnormally. By analyzing the change in the magnetic flux, defects or cracks on the outer wall of the pipeline 3 are detected, achieving the effect of quickly and accurately detecting defects on the pipeline 3. The first motor 7 drives the transmission gear 37 to rotate. 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 outer shell 1, enabling the rubber tube 27 to 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. During the contact process of 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,Drive the sliding of the insertion rod 54 while squeezing the connecting spring 51, drive the linkage frame 49 and the second connecting clip 55 to rotate through the intermediate strip 50, thereby driving the relative rotation of the second gear 48 and the first gear 47, causing the first connecting clip 46 and the second connecting clip 55 to open, 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, the card slot 52 deflects, so that the card block 53 is stuck inside the card slot 52, the insertion rod 54 returns to its original position, and the first connecting clip 46 and the second connecting clip 55 clamp the fixing rod 45, realizing the connection between the upper sliding shell 9 and the lower sliding shell 11, achieving 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, drive the first roller 19 and the second roller 25 to rotate respectively. The first roller 19 and the second roller 25 rotate on the surface of the pipeline 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 pipeline 3, thereby driving the housing 1, the moving plate 8 and the fixing plate 13 to move on the surface of the pipeline 3, achieving the effect of automatically moving the housing 1, the moving plate 8 and the fixing plate 13 on the outer wall of the pipeline 3. When the housing 1 moves to the right-angle bend of the pipeline 3, the guiding roller 21 first contacts the outer wall of the pipeline 3. During the continuous movement, the guiding roller 21 slides to cause the transmission frame 22 to rotate, drive the rotating frame 17 and the first roller 19 to move through the connecting plate 20, so that the first roller 19 gradually disengages from the outer surface of the pipeline 3, reducing the picking-up power movement speed of the side of the housing 1 close to the first roller 19. The second roller 25 continues to rotate to drive the upper sliding shell 9 and the lower sliding shell 11 to continue moving on the outer wall of the pipeline 3, making the speeds of the housing 1, the upper sliding shell 9 and the lower sliding shell 11 different on both sides of the right-angle bend of the pipeline 3, enabling the housing 1, the upper sliding shell 9 and the lower sliding shell 11 to turn on the outer surface of the pipeline 3, reducing the extrusion of the outer wall of the pipeline 3 during the movement of the housing 1, the upper sliding shell 9 and the lower sliding shell 11, and keeping the distance between the moving plate 8 and the fixing plate 13 and the outer wall surface of the pipeline 3 constant, achieving the effect of keeping the detection data of the magnetic flux sensor 12 stable at the right-angle bend of the pipeline 3.,

[0065] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. An oil and gas pipeline stress area detection device, comprising a housing (1), characterized in that, Inside the said housing (1), there are two slide rails (30) provided. On one side of each of the slide rails (30), there is a middle plate (29) slidably connected respectively. Inside the middle plate (29), there is a sliding plate (28) slidably connected. On the outer wall of the sliding plate (28), there are an upper sliding shell (9) and a lower sliding shell (11) provided respectively. At one end edge of the slide rail (30), there is a first limiting block (31). At the other end edge of the slide rail (30), there is a second limiting block (32). At one side edge of the middle plate (29), there is a limiting block (35). At one side edge of the sliding plate (28), there is an auxiliary blocking block (34). At a position on one side edge of the middle plate (29) close to the auxiliary blocking block (34), there is an auxiliary limiting block (33). On both sides of the housing (1), there are cuts (5) provided respectively. At a position on one side of the housing (1) close to the cut (5), there is a slit (6). At a position on one side of the housing (1) close to the slit (6), there is a fixing plate (13). On one side of each of the upper sliding shell (9) and the lower sliding shell (11), there is a moving plate (8). On the surfaces of the moving plate (8) and the fixing plate (13), there are a plurality of magnetic flux sensors (12). At the central position of the housing (1), there is a pipeline (3). On one side of the housing (1), there is a motion mechanism installed, and the motion mechanism is used to assist in moving on the pipeline (3); The said motion mechanism includes two mounting plates (14) fixedly connected to the other side of the housing (1). On one side of the mounting plate (14), there is a transmission frame (22) rotatably connected. At one end of the transmission frame (22), there is a guide roller (21) rotatably connected. On one side of the transmission frame (22), there is a connecting plate (20) rotatably connected. At a position on one side of the housing (1) close to the mounting plate (14), there are two fixing blocks (15) fixedly connected. On one side of the fixing block (15), there is a rotating frame (17) rotatably connected. At the connection between the rotating frame (17) and the fixing block (15), there is a first torsion spring (16). At one end of the rotating frame (17), there is a second motor (18) fixedly connected. At one end of the output shaft of the second motor (18), there is a first roller (19) fixedly connected.

2. The stress area detection device for an oil and gas pipeline according to claim 1, wherein, Inside the housing (1), there is a sliding mechanism installed. The sliding mechanism includes a plurality of first buffer plates (40) respectively rotatably connected to one side of the housing (1), the upper sliding shell (9), and the lower sliding shell (11). On one side of the first buffer plate (40), there is a second buffer plate (41) rotatably connected. At one end of the second buffer plate (41), there is a connecting block (42) rotatably connected. On one side of the connecting block (42), there is a rolling roller (44) rotatably connected. On the outer surface of the rolling roller (44), there are a plurality of guide wheels (43) rotatably connected.

3. The stress area detection device for an oil and gas pipeline according to claim 2, wherein 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 arranged between two second buffer plates (41). The pipeline (3) is located between multiple rolling rollers (44), and the outer wall of the pipeline (3) contacts the guide wheel (43).

4. The stress area detection device for an oil and gas pipeline according to claim 3, characterized in that, The connecting plate (20) is rotatably connected to the rotating frame (17). Two fixing pieces (10) are respectively fixedly connected to one side of the upper sliding shell (9) and the lower sliding shell (11). An auxiliary frame (26) is rotatably connected to one side of the fixing piece (10). 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 provided between the fixing piece (10) and the auxiliary frame (26). A first handle (2) is fixedly connected to the upper surface of the housing (1). A second handle (4) is fixedly connected to the upper surface of the mounting piece (14).

5. The stress area detection device for an oil and gas pipeline according to claim 4, characterized in that, A transmission mechanism is installed inside the housing (1). The transmission mechanism includes a plurality of limiting frames (38) fixedly connected to the inner wall of the top of the housing (1). A first motor (7) is fixedly connected to one side of the housing (1) near the limiting frame (38). 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 limiting frame (38). A steel wire rope (36) is arranged inside the rubber tube (27).

6. The stress area detection device for an oil and gas pipeline according to claim 5, characterized in that, The material of the rubber tube (27) is elastic, and the material of the steel wire rope (36) is steel wire. One end of the rubber tube (27) is respectively 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 engaged with the transmission gear (37). The rotation of the transmission gear (37) drives the rubber tube (27) to slide inside the limiting frame (38). A baffle is arranged at the bottom position of the transmission gear (37) on one inner wall of the housing (1).

7. An oil and gas pipeline stress area detection device according to claim 6, characterized in that, A connection mechanism is provided at the connection between the upper sliding shell (9) and the lower sliding shell (11). The connection mechanism includes a first gear (47) rotatably connected to the inner wall of the bottom end of the upper sliding shell (9). A first connection clip (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 connection clip (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 connection clip (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). A plug rod (54) is slidably connected to the top of the mounting frame.

8. The stress area detection device for an oil and gas pipeline according to claim 7, characterized in that The top end of the insertion rod (54) is rotatably connected to an intermediate bar (50), the intermediate 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), a card slot (52) is arranged 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). The position of the second connecting clip (55) is between the first connecting clip (46) and the second connecting clip (55).

9. The detection method of an oil and gas pipeline stress area detection device according to claim 8, characterized in that, The detection method includes the following steps: S1. Preparation: The outer shell (1) is sleeved on the pipeline (3), a plurality of guide wheels (43) are in contact with the outer wall of the pipeline (3), by driving the intermediate plate (29) to slide on the slide rail (30), and at the same time driving the sliding plate (28) to slide on the intermediate plate (29), 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 into a ring and sleeved on the pipeline (3); S2. Connection: During the contact process of the upper sliding shell (9) and the lower sliding shell (11), the insertion rod (54) presses the card slot (52) at the top of the lower sliding shell (11), drives the insertion rod (54) to slide and at the same time presses the connecting spring (51), thereby driving the second gear (48) and the first gear (47) to rotate relatively, the fixing rod (45) enters between the first connecting clip (46) and the second connecting clip (55), so that the clamping block (53) is stuck inside the card slot (52), 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), 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. A complete ring is formed between the moving plate (8) and the fixed plate (13) around the pipeline (3) for one circle. A plurality of magnetic flux sensors (12) on the moving plate (8) and the fixed plate (13) detect the outer wall of the pipeline (3). In the area where stress is concentrated on the outer wall of the pipeline (3), the magnetic flux will increase abnormally. By analyzing the change of the magnetic flux, defects or cracks on the outer wall of the pipeline (3) are detected; S4. Turning: When the outer shell (1) moves to the right-angle turning of the pipeline (3), the guide roller (21) slides to make the transmission frame (22) rotate, so that the first roller (19) gradually disengages from the outer surface of the pipeline (3), the driving speed of the side of the outer shell (1) close to the first roller (19) decreases, so that the speeds of the outer shell (1), the upper sliding shell (9) and the lower sliding shell (11) on both sides of the right-angle turning of the pipeline (3) are different, and the outer shell (1), the upper sliding shell (9) and the lower sliding shell (11) turn on the outer surface of the pipeline (3).

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