Apparatus for detecting defects in a pipe weld

Abstract

The application discloses a kind of detection equipment for pipeline weld defect, the detection equipment includes: magnetic flux leakage detection section, including magnetic flux leakage detection section main body, first moving mechanism and magnetic flux leakage detection probe assembly, first moving mechanism can be movably arranged on magnetic flux leakage detection section main body along the axis of pipeline, magnetic flux leakage detection probe assembly is arranged at the outer circumferential side of magnetic flux leakage detection section main body and is used to collect the magnetic flux leakage signal of pipeline inner wall;Multiple odometer components are spaced apart along the circumference of magnetic flux leakage detection section main body and each has an odometer for closely contacting the inner wall of the pipeline;Controller is configured to: obtain the magnetic flux leakage signal;According to the magnetic flux leakage signal, determine that the pipeline weld has defects;Obtain the mileage data of multiple odometers;According to the mileage data of the main odometer, the position of the defect is located, and the measurement accuracy of the odometer is improved, and the positioning accuracy of the defect position of the pipeline weld is further ensured.

Description

Technical Field

[0001] This invention relates to the field of pipeline inspection technology, and more specifically to a detection device for pipeline weld defects. Background Technology

[0002] Oil and gas pipelines are the lifeblood of a nation's energy transportation, and their safe operation has a significant impact on the country's economic development and the stability of people's lives. Pipelines are the safest and most reliable mode of large-volume energy transportation; however, due to factors such as welding during construction, corrosion during operation, and damage from third parties, oil and gas pipeline leaks occur frequently. Among these, the weld seams of oil and gas pipelines have always been a weak link in pipeline safety due to factors such as the level of technology during construction, on-site welding quality management, and the operating environment. Weld cracking is one of the main failure modes of oil and gas pipelines.

[0003] Crack detection in pipeline welds is a commonly used pipeline defect detection technology both domestically and internationally. However, since pipelines are laid underground, positioning devices are needed to accurately locate the cracks in the welds to provide a basis for subsequent pipeline repair. Existing equipment for detecting weld cracks in pipelines often uses odometer wheels for positioning within the pipeline. However, odometer wheels may slip while running inside the pipeline, leading to inaccurate measurement results and making it impossible to accurately locate the cracks in the welds. Summary of the Invention

[0004] The purpose of this invention is to provide a detection device for pipeline weld defects, which has the advantages of improving the measurement accuracy of odometer wheels and ensuring the accurate location of pipeline weld defects.

[0005] To achieve the above objectives, the present invention provides a detection device for defects in pipe welds, the detection device comprising:

[0006] The magnetic flux leakage detection section includes a magnetic flux leakage detection section body, a first moving mechanism, and a magnetic flux leakage detection probe assembly. The first moving mechanism is movably mounted on the magnetic flux leakage detection section body along the pipeline axis. The magnetic flux leakage detection probe assembly is mounted on the outer periphery of the magnetic flux leakage detection section body and is used to collect magnetic flux leakage signals from the inner periphery of the pipeline.

[0007] Multiple mileage wheel assemblies are distributed circumferentially along the main body of the magnetic flux leakage detection section and each has a mileage wheel for close contact with the inner circumferential wall of the pipe;

[0008] The controller is configured as follows:

[0009] Obtain the leakage magnetic signal;

[0010] Defects were identified in the pipe welds based on magnetic flux leakage signals.

[0011] Acquire mileage data from multiple mileage wheels;

[0012] The main mileage wheel is determined based on multiple mileage data points;

[0013] The location of the defect is determined based on the mileage data from the main mileage wheel.

[0014] In an embodiment of the present invention, determining the main mileage wheel based on multiple mileage data includes:

[0015] Compare multiple mileage data points and determine the maximum value;

[0016] The mileage wheel corresponding to the maximum value is determined as the primary mileage wheel.

[0017] In an embodiment of the present invention, the detection device further includes a speed control system disposed on the front side of the magnetic flux leakage detection section. The speed control system includes a fixed member and a rotating member. The fixed member is funnel-shaped and has an internal cavity. The peripheral wall of the fixed member is provided with a first perforation for the flow medium in the pipeline to pass through. The rotating member is rotatably disposed in the internal cavity and has a blocking part. The shape and size of the blocking part are the same as the shape and size of the first perforation.

[0018] In an embodiment of the present invention, the magnetic flux leakage detection section further includes a first cup assembly sleeved on the main body of the magnetic flux leakage detection section and having a second perforation, wherein the extending direction of the second perforation is consistent with the axial direction of the main body of the magnetic flux leakage detection section.

[0019] In an embodiment of the present invention, the magnetic flux leakage detection section further includes a cylindrical iron core sleeved on the outside of the main body of the magnetic flux leakage detection section and a first magnetizer assembly and a second magnetizer assembly respectively disposed at both ends of the cylindrical iron core. The magnetic flux leakage detection probe assembly is sleeved on the outside of the cylindrical iron core and located between the first magnetizer assembly and the second magnetizer assembly.

[0020] In an embodiment of the present invention, both the first magnetizer assembly and the second magnetizer assembly include a permanent magnet and a steel brush. The permanent magnet is sleeved on the outside of the cylindrical iron core, and the steel brush is sleeved on the outside of the permanent magnet and contacts the pipe.

[0021] In an embodiment of the present invention, the first moving mechanism includes a first moving component and a second moving component respectively disposed at the front end and rear end of the main body of the magnetic flux leakage detection section. Both the first moving component and the second moving component include a plurality of moving wheels that are circumferentially spaced along the main body of the magnetic flux leakage detection section.

[0022] In an embodiment of the present invention, the detection device further includes a crack dynamic detection section disposed on the rear side of the magnetic flux leakage detection section and flexibly connected to the magnetic flux leakage detection section.

[0023] In an embodiment of the present invention, the crack dynamic detection section includes a crack dynamic detection section body, a second moving mechanism, and a crack dynamic detection probe assembly. The second moving mechanism is movably disposed on the crack dynamic detection section body along the pipeline axial direction. The crack dynamic detection probe assembly is disposed on the outer peripheral side of the crack dynamic detection section body and is used to dynamically detect cracks on the inner peripheral wall of the pipeline.

[0024] In an embodiment of the present invention, the crack dynamic detection probe assembly includes a first probe bracket and a crack dynamic detection probe, which are disposed on one side of the crack dynamic detection section body and are in the shape of a parallelogram. The crack dynamic detection probe is disposed on the side of the first probe bracket away from the crack dynamic detection section body.

[0025] The above technical solution includes a magnetic flux leakage detection section, multiple mileage wheel assemblies, and a controller. The magnetic flux leakage detection probe assembly on the magnetic flux leakage detection section is used to collect magnetic flux leakage signals from the inner circumferential wall of the pipeline. The controller determines the presence of defects in the pipeline weld based on the magnetic flux leakage signals. Then, it determines the main mileage wheel based on the mileage data of the multiple mileage wheels, and locates the defect based on the mileage data of the main mileage wheel. This further ensures the accuracy of mileage measurement and significantly improves the accuracy of weld defect location. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the detection device in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the overall structure of the magnetic flux leakage detection section in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of a partial component in the magnetic flux leakage detection section of this invention.

[0030] Figure 4 This is a schematic diagram of the structure of the magnetic flux leakage detection probe assembly in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the crack dynamic detection section in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the crack dynamic detection probe assembly in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the speed control system in an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of the first electronic compartment in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures

[0036] 1. Magnetic flux leakage detection section 101. Main body of the magnetic flux leakage detection section.

[0037] 102 First moving mechanism 1021 First moving component

[0038] 1022 Second moving component 1023 Moving wheel

[0039] 103 Magnetic flux leakage detection probe assembly 1031 Second probe bracket

[0040] 1032 Magnetic flux leakage detection probe; 104 First cup assembly

[0041] 1041 First sealing bowl; 1042 Second sealing bowl

[0042] 1043 Second perforation 105 Cylindrical iron core

[0043] 106 First magnetizer assembly 107 Second magnetizer assembly

[0044] 108 Permanent Magnet 109 Steel Brush

[0045] 110 First Electronics Cabin; 111 First Battery

[0046] 112 First Electronic Packet 2 Mileage Wheel Assembly

[0047] 201 Mileage Wheel 3 Speed ​​Control System

[0048] 301 Fastener 3011 First Through Hole

[0049] 302 Rotating component; 3021 Blocking part

[0050] 4. Crack Dynamic Detection Section 401: Main Body of the Crack Dynamic Detection Section

[0051] 402 Second moving mechanism 4021 Third moving component

[0052] 4022 Fourth Moving Component; 403 Crack Dynamic Detection Probe Assembly

[0053] 4031 First probe bracket; 4032 Crack dynamic detection probe

[0054] 4033 Spring, 4034 Wear-resistant Plate

[0055] 404 Second sealing cup assembly; 4041 Third sealing cup

[0056] 4042 Fourth sealing cup; 4043 Third perforation

[0057] 5 Universal joints 6 Diameter sensor Detailed Implementation

[0058] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0059] An embodiment of the present invention provides a device for detecting defects in pipe welds. In this embodiment, the weld is a circumferential weld. Figure 1-8 As shown, the detection device includes a magnetic flux leakage detection section 1, multiple odometer wheel assemblies 2, and a controller. The magnetic flux leakage detection section 1 includes a magnetic flux leakage detection section body 101, a first moving mechanism 102, and a magnetic flux leakage detection probe assembly 103. The first moving mechanism 102 is movably mounted on the magnetic flux leakage detection section body 101 along the pipeline axial direction, enabling the magnetic flux leakage detection section 1 to move axially within the pipeline. The magnetic flux leakage detection probe assembly 103 is located on the outer periphery of the magnetic flux leakage detection section body 101 and is used to collect magnetic flux leakage signals from the inner periphery of the pipeline. The magnetic flux leakage detection probe assembly 103 is communicatively connected to the controller. Multiple odometer wheel assemblies... Components 2 are circumferentially spaced along the main body 101 of the magnetic flux leakage detection section and each has a mileage wheel 201 for close contact with the inner circumferential wall of the pipe. The mileage wheel 201 is communicatively connected to the controller. That is, each mileage wheel assembly 2 includes a mileage wheel 201 bracket and a mileage wheel 201, one end of which is connected to the rear end face of the main body 101 of the magnetic flux leakage detection section and is inclinedly arranged. The mileage wheel 201 is located at the end of the mileage wheel 201 bracket away from the main body 101 of the magnetic flux leakage detection section and is in close contact with the inner circumferential wall of the pipe. When the mileage wheel 201 rolls along the inner circumferential wall of the pipe, it can realize the measurement of the movement mileage of the detection device. The controller is configured to perform the following steps:

[0060] Step S101: Acquire leakage magnetic signal;

[0061] Step S102: Determine the presence of defects in the pipe weld based on the magnetic flux leakage signal;

[0062] Step S103: Obtain mileage data from multiple mileage wheels 201;

[0063] Step S104: Determine the main mileage wheel based on multiple mileage data;

[0064] Step S105: Locate the defect based on the mileage data of the main mileage wheel.

[0065] Specifically, when the detection equipment is running inside the pipeline, the magnetic flux leakage detection probe assembly 103 performs magnetic flux leakage detection on the inner circumferential wall of the pipeline. If there is a defect on the inner circumferential wall of the pipeline, the magnetic flux leakage detection probe assembly 103 will detect the magnetic flux leakage signal and send the magnetic flux leakage signal to the controller. The controller then analyzes the magnetic flux leakage signal to determine whether there is a weld defect in the pipeline. Since there is a flowing medium (such as oil or natural gas) in the pipeline, the mileage wheel 201 may slip when it rolls on the inner circumferential wall of the pipeline, which will make the mileage data measured by the mileage wheel 201 inaccurate. To solve this problem, this embodiment is provided with multiple mileage wheels 201. When multiple mileage wheels 201 run on the inner circumferential wall of the pipeline, the mileage detection function is activated and the mileage data detected by each wheel is sent to the controller. Furthermore, since the multiple odometer wheels 201 are not located in the same position, the probability of multiple odometer wheels 201 slipping simultaneously is extremely low. Based on the above reasons, after obtaining the odometer data of each of the multiple odometer wheels 201, the controller analyzes it to determine the master odometer wheel among the multiple odometer wheels 201. The master odometer wheel is the odometer wheel 201 with the lowest probability of slipping. Then, the controller locates the position of the weld defect based on the odometer data of the master odometer wheel, which can further ensure the accuracy of odometer measurement and thus greatly improve the accuracy of weld defect location.

[0066] In one embodiment of the present invention, step S104: determining the main mileage wheel based on multiple mileage data includes steps S201-S202, wherein:

[0067] Step S201: Compare multiple mileage data and determine the maximum value;

[0068] Step S202: Determine the mileage wheel 201 corresponding to the maximum value as the main mileage wheel.

[0069] Specifically, in this embodiment, the leakage magnetic field detection section 1 is provided with three mileage wheels 201 that are evenly distributed around the circumference of the leakage magnetic field detection section body 101. If one or two mileage wheels 201 slip, the corresponding mileage data will change (that is, when the mileage wheel 201 slips, the mileage measurement will temporarily stop, which will result in a relative decrease in mileage data). Therefore, after obtaining the three sets of mileage data, the controller compares them to determine the maximum value among the three sets of mileage data, and then further determines the mileage wheel 201 corresponding to the maximum mileage data as the main mileage wheel.

[0070] In one embodiment of the present invention, the detection device further includes a speed control system 3 disposed on the front side of the magnetic flux leakage detection section 1. The speed control system 3 includes a fixing member 301 and a rotating member 302. The fixing member 301 is funnel-shaped and has an internal cavity. A first perforation 3011 for the flow medium in the pipeline to pass through is provided on the peripheral wall of the fixing member 301. The rotating member 302 is rotatably disposed in the internal cavity and has a blocking part 3021. The shape and size of the blocking part 3021 are the same as the shape and size of the first perforation 3011.

[0071] Specifically, if the detection equipment moves too fast, it will be unable to fully detect the location of weld defects, affecting the detection results. If the detection equipment moves too slowly, it will reduce the detection efficiency of weld defects. To solve the above technical problems, the detection equipment in this embodiment is equipped with a speed control system 3 connected to the flange and the main body 101 of the magnetic flux leakage detection section to control the running speed of the detection equipment. The speed control system 3 also includes a drive motor, a front baffle, and a rear baffle disposed on the front side of the leakage magnetic field detection section 1. The front baffle is disposed at the front end of the fixing member 301, and the rear baffle is disposed at the rear end of the fixing member 301. The rear baffle is provided with a through hole, and the peripheral wall of the fixing member 301 is provided with a first through hole 3011. The flowing medium (such as oil or natural gas) can flow into or out of the internal cavity of the fixing member 301 through the through hole and the first through hole 3011. The rotating member 302 is disposed in the internal cavity and is driven and connected to the drive motor. The rotating member 302 includes a rod, multiple blades, and multiple blocking parts 3021. One end of the rod extends out of the rear baffle and is driven and connected to the drive motor. The multiple blades are arranged around the rod. A blocking part 3021 is disposed on the outer peripheral wall of the rod, on the side of the blade away from the rod. The shape and size of the blocking part 3021 are the same as those of the first perforation 3011. By controlling the rotation position of the blocking part 3021, the opening size of the first perforation 3011 can be controlled. The larger the opening of the first perforation 3011, the smoother the flow of the medium through the internal cavity, which is more conducive to the operation of the detection equipment. This method realizes the active drainage of the flow medium. If the opening of the first perforation 3011 is smaller, the flow of the medium through the internal cavity is less smooth. This unsmooth flow will hinder the operation of the detection equipment and thus reduce the operating speed of the detection equipment.

[0072] Furthermore, the speed control system 3 in this embodiment also includes a sealed chamber and a reducer. The sealed chamber is located on the front side of the leakage magnetic field detection section 1, and both the drive motor and the reducer are located in the sealed chamber. The input end of the reducer is connected to the output end of the drive motor, and the output end of the reducer extends out of the sealed chamber and is driven and connected to the rotating part 302. In this embodiment, the drive motor can be selected as a DC brushless servo motor, and the reducer can be selected as a planetary gear reducer.

[0073] In one embodiment of the present invention, the magnetic flux leakage detection section 1 further includes a first cup assembly 104 sleeved on the magnetic flux leakage detection section body 101 and having a second perforation 1043, wherein the extending direction of the second perforation 1043 is consistent with the axial direction of the magnetic flux leakage detection section body 101. Specifically, the first sealing cup assembly 104 includes a first sealing cup 1041 and a second sealing cup 1042, both made of polyurethane material. Both are annular and respectively fitted onto the front and rear ends of the magnetic flux leakage detection section body 101. The outer diameter of the first sealing cup 1041 and the second sealing cup 1042 is slightly larger than the inner diameter of the pipe so that they can be tightly supported on the inner circumferential wall of the pipe to form a sealing surface, thereby isolating the flowing medium at both ends of the first sealing cup assembly 104 to generate a pressure difference. This pressure difference can drive the detection equipment forward. Furthermore, both the first sealing cup 1041 and the second sealing cup 1042 are provided with a second perforation 1043 to avoid the pressure difference at both ends of the first sealing cup assembly 104 being too large, which would cause the operating speed of the detection equipment to be too fast. The flowing medium passes through the first sealing cup 1041 and the second sealing cup 1042 through the second perforation 1043, which can play a role in leakage, thereby relieving the pressure at both ends of the first sealing cup assembly 104 and reducing the operating speed of the detection equipment. This leakage method is a fixed leakage.

[0074] In one embodiment of the present invention, a combination of fixed discharge and active discharge is adopted. By setting the number of second perforations 1043, the discharge area of ​​the fixed discharge method is 2%. By driving the rotating component 302 to change the opening of the first perforation 3011, the discharge area of ​​the active discharge is 12%. The operating speed of the detection equipment can be controlled below 5m / s.

[0075] In one embodiment of the present invention, the magnetic flux leakage detection section 1 further includes a cylindrical iron core 105 sleeved on the outside of the main body 101 of the magnetic flux leakage detection section, and a first magnetizer assembly 106 and a second magnetizer assembly 107 respectively disposed at both ends of the cylindrical iron core 105. The magnetic flux leakage detection probe assembly 103 is disposed on the outer periphery of the cylindrical iron core 105 and located between the first magnetizer assembly 106 and the second magnetizer assembly 107. The cylindrical iron core 105 and the first magnetizer assembly 106 and the second magnetizer assembly 107 work together to saturate the inner peripheral wall of the pipe, ensuring that a high-quality magnetic flux leakage signal is collected at the defect location of the pipe, which is beneficial to further improve the accuracy of pipe defect detection. The magnetic flux leakage detection probe assembly 103 includes a second probe bracket 1031 fixedly connected to the cylindrical iron core 105 on one side and in the shape of a parallelogram, and a magnetic flux leakage detection probe 1032. The magnetic flux leakage detection probe 1032 is disposed on the second probe bracket 1031. On the side away from the cylindrical iron core 105, further, in this embodiment, the magnetic flux leakage detection probe assembly 103 is provided in two rows. The two rows of magnetic flux leakage detection probe assemblies 103 are arranged back and forth along the axial direction of the magnetic flux leakage detection section body 101, which can effectively prevent the magnetic flux leakage detection probe assemblies 103 from being squeezed and damaged when entering the pipeline. The number of magnetic flux leakage detection probe assemblies 103 in each row is 80. The 80 magnetic flux leakage detection probe assemblies 103 are evenly distributed along the circumferential spacing of the cylindrical iron core 105, and there is an overlapping detection area between adjacent magnetic flux leakage detection probe assemblies 103, which is used to realize zero-gap detection of the pipeline circumferentially and ensure the comprehensiveness of defect detection on the inner circumferential wall of the pipeline. In addition, the magnetic flux leakage detection probe 1032 in this embodiment includes 8 Hall sensors and 2 eddy current sensors. The Hall sensors are used to collect magnetic flux leakage signals to realize the detection of larger weld defects. The eddy current sensors are used to distinguish between inner wall defects and outer wall defects of the pipeline.

[0076] In one embodiment of the present invention, both the first magnetizer assembly 106 and the second magnetizer assembly 107 include a permanent magnet 108 and a steel brush 109. The permanent magnet 108 is sleeved on the outside of the cylindrical iron core 105, and the steel brush 109 is sleeved on the outside of the permanent magnet 108 and in contact with the pipe. The steel brush 109 has the advantages of strong support and impact resistance. The permanent magnet 108 can be an N48H neodymium iron boron permanent magnet, which has the advantages of high performance and high temperature resistance. The permanent magnet 108 is connected to the inner wall of the pipe through the steel brush 109. The magnetic lines of force generated by the permanent magnet 108 form a closed magnetic circuit through the cylindrical iron core 105, the permanent magnet 108, the steel brush 109 and the inner wall of the pipe, so as to achieve saturation magnetization of the inner wall of the pipe, thereby ensuring that a high-quality leakage magnetic signal is collected at the defect location of the pipe.

[0077] In one embodiment of the present invention, the first moving mechanism 102 includes a first moving component 1021 and a second moving component 1022 respectively disposed at the front end and rear end of the magnetic flux leakage detection section body 101. Both the first moving component 1021 and the second moving component 1022 include a plurality of moving wheels 1023 spaced circumferentially along the magnetic flux leakage detection section body 101. Specifically, both the first moving component 1021 and the second moving component 1022 include a plurality of inclined moving wheel supports. One end of each moving wheel support is connected to the magnetic flux leakage detection section body 101, and the moving wheels 1023 are disposed at the end of the moving wheel support away from the magnetic flux leakage detection section body 101, serving to stably support the magnetic flux leakage detection section 1 while realizing its moving function. Furthermore, due to the large weight of the magnetic leakage joint, if it is not stably supported, it will bend downward at the middle position in the axial direction, which will cause the first sealing cup 1041 and the second sealing cup 1042 to rub against the inner wall of the pipe during the detection process, resulting in uneven wear. In this embodiment, the first moving component 1021 and the second moving component 1022 are respectively set at the front end and the rear end of the magnetic leakage detection joint body 101, which can avoid the above situation.

[0078] In one embodiment of the present invention, the main body of the magnetic flux leakage section is a hollow structure, which forms a first sealed chamber. The magnetic flux leakage section also includes a first electronic chamber 110 removably disposed in the first sealed chamber. The first electronic chamber 110 can be removed or inserted entirely from the first sealed chamber, facilitating the replacement of the first battery 111 or the use and maintenance of other components. The first electronic chamber 110 is a pressure-bearing structure with a pressure-bearing capacity ≥10MPa. In this embodiment, the first electronic chamber 110 includes a first pressure-bearing chamber body and a first battery 111 and a first electronic pack 112 disposed in the first pressure-bearing chamber body (in this embodiment, the first electronic pack 112 can be integrated with the controller). The first battery 111 provides power to the first electronic pack 112 and each probe on the magnetic flux leakage section. The first electronic pack 112 is used to collect and store detection data (in this embodiment, the first electronic pack 112 collects data from the magnetic flux leakage detection probe 1032). The sampling frequency of the first electronic pack 112 can reach 5KHz, and the axial sampling interval is 1mm when the detection equipment operating data is 5m / s.

[0079] In one embodiment of the present invention, the detection device further includes a crack dynamic detection section 4 disposed on the rear side of the magnetic flux leakage detection section 1 and flexibly connected to the magnetic flux leakage detection section 1. Specifically, the detection device also includes a universal joint 5, the front end of which is connected to the magnetic flux leakage detection section 1, and the rear end of which is connected to the crack dynamic detection section 4. This avoids the magnetic flux leakage detection section 1 from affecting the crack dynamic detection section 4 when turning, and increases the stability of the movement of the magnetic flux leakage detection section 1 and the crack dynamic detection section 4 when bending. Furthermore, the crack dynamic detection section 4 in this embodiment can detect various defects such as small-opening incomplete fusion positions, small-opening incomplete penetration positions, cracks, small-sized undercut, weld cracking, hydrogen-induced cracking, fatigue cracks, and shrinkage cracks on the circumferential weld.

[0080] In one embodiment of the present invention, the crack dynamic detection section 4 includes a crack dynamic detection section body 401, a second moving mechanism 402, and a crack dynamic detection probe assembly 403. The second moving mechanism 402 is movably disposed on the crack dynamic detection section body 401 along the pipeline axial direction, and the crack dynamic detection probe assembly 403 is disposed on the outer periphery of the crack dynamic detection section body 401. Specifically, the second moving mechanism 402 includes a third moving component 4021 and a fourth moving component 4022 respectively disposed at the front end and rear end of the crack dynamic detection section body 401. Both the third moving component 4021 and the fourth moving component 4022 include a plurality of moving wheels 1023 distributed circumferentially at intervals along the crack dynamic detection section body 401. Specifically, both the third moving component 4021 and the fourth moving component 4022 include multiple inclined moving wheel supports. One end of each moving wheel support is connected to the crack dynamic detection section body 401. Moving wheels 1023 are located at the end of the moving wheel support away from the crack dynamic detection section body 401, providing stable support while simultaneously enabling the movement of the crack dynamic detection section 4. This avoids uneven wear caused by unstable support, thus preventing damage to the crack dynamic detection probe assembly 403. In this embodiment, the crack dynamic detection probe assembly 403 is arranged in two rows, with the two rows arranged axially along the crack dynamic detection section body 401. This effectively prevents the crack dynamic detection probe assemblies 403 from being crushed and damaged when entering the pipeline. Each row contains 80 crack dynamic detection probe assemblies 403, which are evenly distributed circumferentially along the crack dynamic detection section body 401, with adjacent crack dynamic detection probe assemblies 403... The overlapping detection areas between 03 and 03 enable comprehensive detection of defects on the inner wall of the pipe. Furthermore, the crack dynamic detection probe 4032 in this embodiment includes a sensing module, a signal processing module, and a communication module, all communicatively connected to the controller. The sensing module consists of a permanent magnet, a magnetic disturbance sensor, and a triaxial Hall magnetic sensor. During detection, the permanent magnet moves relative to the pipe wall, generating eddy current signals. The magnetic disturbance sensor (e.g., a coil) measures crack defect signals on the inner wall of the pipe. When the permanent magnet is brought close to the pipe surface, magnetic interaction occurs, creating a magnetic disturbance environment. Crack defects on the inner wall of the pipe act as disturbance sources, generating magnetic disturbances that are detected by the magnetic disturbance sensor. The triaxial Hall magnetic sensor measures abnormal signals generated by motional eddy currents at cracks on the inner wall of the pipe. After detection, the sensing module sends the detection results to the signal processing module, which processes the results. The signal processing module then sends the processed results to the controller via the communication module.In this embodiment, the crack dynamic detection section 4 can detect cracks on the inner wall of the pipe even when the detection equipment is in motion, without having to deliberately stop the detection equipment to ensure the accuracy of the detection results, thus effectively improving the detection efficiency of cracks on the inner wall of the pipe.

[0081] In one embodiment of the present invention, a crack dynamic detection probe assembly 403 includes a first probe bracket 4031 and a crack dynamic detection probe 4032, both of which are disposed on one side of a crack dynamic detection section body 401 and are in the shape of a parallelogram. The crack dynamic detection probe 4032 is disposed on the side of the first probe bracket 4031 away from the crack dynamic detection section body 401. Specifically, the first probe bracket 4031 includes a first connector, a second connector, a third connector, and a fourth connector that together form a parallelogram. The first connector is disposed on the crack dynamic detection section body 401. The second and third connectors are both inclined and their bottom ends are rotatably connected to the two ends of the first connector. The two ends of the fourth connector are respectively connected to the top ends of the second and third connectors. A mounting cavity for the crack dynamic detection probe 4032 is formed on the fourth connector, and the crack dynamic detection probe 4032 is mounted in the cavity. The outer side of the first probe bracket 4031 is wrapped with a wear-resistant sheet 4034 to protect the crack dynamic detection probe 4032 and prevent wear on the probe 4032 when the detection equipment is running in the pipeline. The first probe bracket 4031 also includes a spring 4033 inclined in the parallelogram. One end of the spring 4033 is connected to the third connector and the other end is connected to the fourth connector. The spring 4033 provides tension, and the first probe bracket 4031 can move with the concavity and convexity of the pipeline, so that the crack dynamic detection probe 4032 can effectively and fully contact the inner wall of the pipeline.

[0082] In one embodiment of the present invention, the crack dynamic detection section 4 is also provided with multiple mileage wheel assemblies 2. The multiple mileage wheel assemblies 2 are evenly spaced circumferentially at the rear end of the crack dynamic detection section body 401 and are in close contact with the inner circumferential wall of the pipe. The mileage wheel assembly 2 is arranged in the same way as in the leakage magnetic field detection section 1. The mileage wheel assembly 2 here also includes a mileage wheel 201 bracket and a mileage wheel 201 that is communicatively connected to the controller. In this embodiment, when the magnetic flux leakage detection section 1 and the crack dynamic detection section 4 are connected together by the universal joint 5, the data collected by each sensor needs to be analyzed in a unified manner. The data must be aligned, that is, the data of each sensor on the magnetic flux leakage section and the data of each sensor on the crack dynamic detection section 4 are aligned by mileage. This is so that the data detected by the magnetic flux leakage detection section 1 and the data detected by the crack dynamic detection section 4 at a certain position in the pipeline can be viewed and compared. Therefore, in order to avoid the situation where the data is offset due to the rotation error of the mileage wheel 201 during the operation of the two sections of the magnetic flux leakage detection section 1 and the crack dynamic detection section 4, the controller controls the mileage wheel 201 on the crack dynamic detection section 4 to stop measuring, and only relies on the mileage data detected by the mileage wheel 201 on the magnetic flux leakage detection section 1 to determine the main mileage wheel.

[0083] In one embodiment of the present invention, the crack dynamic detection probe assembly 403 further includes a stress detection probe that is communicatively connected to the controller for measuring the axial stress of the pipeline.

[0084] In one embodiment of the present invention, the crack dynamic detection section 4 further includes a diameter measuring sensor 6 disposed on the first connector and connected in communication with the controller, for detecting geometric defects such as pits and elliptical deformation on the inner circumferential wall of the pipe.

[0085] In one embodiment of the present invention, the main body 401 of the crack dynamic detection section is a hollow structure, which forms a second sealed chamber. The crack dynamic detection section 4 also includes a second electronic chamber that is removably disposed in the second sealed chamber. The second electronic chamber can be removed or inserted into the second sealed chamber to facilitate the replacement of the second battery or the use and maintenance of other components. The second electronic chamber is a pressure-bearing structure with a pressure-bearing capacity ≥10MPa. In this embodiment, the second electronic chamber includes a second pressure-bearing chamber body and an IMU (Inertial Measurement Unit), a second battery, and a second electronic pack disposed in the second pressure-bearing chamber body (in this embodiment, the second electronic pack can be integrated with the controller). The second battery provides power to the IMU, the second electronic pack, and the various probes on the crack dynamic detection section 4. The IMU is used for centerline detection and strain detection of the pipeline. The second electronic pack is used to collect and store detection data (in this embodiment, the second electronic pack collects data from the crack dynamic detection probe 4032). The sampling frequency of the second electronic pack can reach 5KHz, and the axial sampling interval is 1mm when the detection equipment operating data is 5m / s.

[0086] In one embodiment of the present invention, the crack dynamic detection section 4 further includes a second cup assembly 404 sleeved on the crack dynamic detection section body 401 and having a third perforation 4043. The extension direction of the third perforation 4043 is consistent with the axial direction of the crack dynamic detection section body 401. Specifically, the second cup assembly 404 includes a third sealing cup 4041 and a fourth sealing cup 4042, both made of polyurethane material. Both are annular and respectively sleeved on the front end and rear end of the crack dynamic detection section body 401. The outer diameter of the third sealing cup 4041 and the fourth sealing cup 4042 is slightly larger than the inner diameter of the pipe so that they can be tightly supported on the inner peripheral wall of the pipe to form a sealing surface. Further, the third sealing cup 4041 and the fourth sealing cup 4042 are both provided with a third perforation 4043.

[0087] In one embodiment of the present invention, the magnetic flux leakage detection section 1 and the crack dynamic detection section 4 are both detachably connected to the universal joint 5, and when the magnetic flux leakage detection section 1 and the crack dynamic detection section 4 are separated, the crack dynamic detection has an independent controller to control each component on it, that is, when the magnetic flux leakage detection section 1 and the crack dynamic detection section 4 are separated, they can independently perform their respective functions without interfering with each other.

[0088] In one embodiment of the present invention, the magnetic flux leakage detection section 1 and the crack dynamic detection section 4 are respectively provided with a first bus box and a second bus box. The first bus box is located at the rear end of the magnetic flux leakage detection section 1 and is used to collect the detection data of the magnetic flux leakage detection probe 1032 on the magnetic flux leakage detection section 1 and transmit it to the first electronic package in the magnetic flux leakage detection section 1. The second bus box is located at the rear end of the crack dynamic detection section 4 and is used to collect the detection data of the crack dynamic detection probe 4032 on the crack dynamic detection section 4 and transmit it to the second electronic package in the crack dynamic detection section 4. Furthermore, both the first bus box and the second bus box adopt a one-to-eight structure, and the connector of each probe in the magnetic flux leakage detection section 1 and the crack dynamic detection section 4 adopts a plug-and-play structure for easy replacement.

[0089] This invention provides a detection device for pipeline weld defects. The detection device includes a magnetic flux leakage detection section, multiple mileage wheel assemblies, and a controller. The magnetic flux leakage detection probe assembly on the magnetic flux leakage detection section is used to collect magnetic flux leakage signals from the inner circumferential wall of the pipeline. The controller determines the presence of defects in the pipeline weld based on the magnetic flux leakage signals. Then, it determines the main mileage wheel based on the mileage data of the multiple mileage wheels, and locates the defect based on the mileage data of the main mileage wheel, further ensuring the accuracy of mileage measurement and thus significantly improving the accuracy of weld defect location.

[0090] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

[0091] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0092] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0093] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for detecting defects in pipe welds, characterized in that, The detection equipment includes: A magnetic flux leakage detection section (1) includes a magnetic flux leakage detection section body (101), a first moving mechanism (102), a magnetic flux leakage detection probe assembly (103), and a first cup assembly (104). The first moving mechanism (102) is movably mounted on the magnetic flux leakage detection section body (101) along the pipe axis. The magnetic flux leakage detection probe assembly (103) is mounted on the outer periphery of the magnetic flux leakage detection section body (101) and is used to collect magnetic flux leakage signals from the inner periphery of the pipe. The first cup assembly (104) is sleeved on the magnetic flux leakage detection section body (101) and has a second through hole (1043). The extension direction of the second through hole (1043) is consistent with the axial direction of the magnetic flux leakage detection section body (101). The magnetic flux leakage detection section (1) also includes a cylindrical iron core (105) sleeved on the outside of the main body (101) of the magnetic flux leakage detection section and a first magnetizer assembly (106) and a second magnetizer assembly (107) respectively disposed at both ends of the cylindrical iron core (105). The magnetic flux leakage detection probe assembly (103) is sleeved on the outside of the cylindrical iron core (105) and located between the first magnetizer assembly (106) and the second magnetizer assembly (107). The cylindrical iron core (105) and the first magnetizer assembly (106) and the second magnetizer assembly (107) work together to saturate the inner wall of the pipe, ensuring that a high-quality magnetic flux leakage signal is collected at the defect location of the pipe. Multiple mileage wheel assemblies (2) are distributed circumferentially along the main body (101) of the magnetic flux leakage detection section and each has a mileage wheel (201) for close contact with the inner circumferential wall of the pipe. The controller is configured as follows: Acquire the leakage magnetic signal; The leakage magnetic signal indicates that there is a defect in the pipe weld. Acquire mileage data from multiple mileage wheels (201); Compare multiple mileage data points and determine the maximum value; The mileage wheel (201) corresponding to the maximum value is determined as the main mileage wheel, and the main mileage wheel is... The wheel with the lowest probability of slipping; The location of the defect is determined based on the mileage data from the main mileage wheel; A speed control system (3) is provided on the front side of the magnetic flux leakage detection section (1) and includes a fixing member (301) and a rotating member (302). The fixing member (301) is funnel-shaped and has an internal cavity. The peripheral wall of the fixing member (301) is provided with a first perforation (3011) for the flow medium in the pipe to pass through. The rotating member (302) is rotatably disposed in the internal cavity and includes a rod, a plurality of blades and a plurality of blocking parts (3021). One end of the rod is driven and connected to a drive motor. The plurality of blades are disposed on the outer peripheral wall of the rod along the circumference of the rod. The blocking parts (3021) are disposed on the side of the blades away from the rod. The shape and size of the blocking parts (3021) are the same as the shape and size of the first perforation (3011).

2. The detection equipment for pipeline weld defects according to claim 1, characterized in that, Both the first magnetizer assembly (106) and the second magnetizer assembly (107) include a permanent magnet (108) and a steel brush (109). The permanent magnet (108) is sleeved on the outside of the cylindrical iron core (105), and the steel brush (109) is sleeved on the outside of the permanent magnet (108) and in contact with the pipe.

3. The detection equipment for pipeline weld defects according to claim 1, characterized in that, The first moving mechanism (102) includes a first moving component (1021) and a second moving component (1022) respectively disposed at the front end and rear end of the main body (101) of the magnetic flux leakage detection section. The first moving component (1021) and the second moving component (1022) each include a plurality of moving wheels (1023) distributed circumferentially along the main body (101) of the magnetic flux leakage detection section.

4. The detection equipment for pipeline weld defects according to claim 1, characterized in that, The detection device also includes a crack dynamic detection section (4) disposed on the rear side of the magnetic flux leakage detection section (1) and flexibly connected to the magnetic flux leakage detection section (1).

5. The detection equipment for pipeline weld defects according to claim 4, characterized in that, The crack dynamic detection section (4) includes a crack dynamic detection section body (401), a second moving mechanism (402), and a crack dynamic detection probe assembly (403). The second moving mechanism (402) is movably disposed on the crack dynamic detection section body (401) along the axial direction of the pipeline. The crack dynamic detection probe assembly (403) is disposed on the outer periphery of the crack dynamic detection section body (401) and is used to dynamically detect cracks on the inner periphery of the pipeline.

6. The detection equipment for pipeline weld defects according to claim 5, characterized in that, The crack dynamic detection probe assembly (403) includes a first probe bracket (4031) and a crack dynamic detection probe (4032) which are disposed on one side of the crack dynamic detection section body (401) and are in the shape of a parallelogram. The crack dynamic detection probe (4032) is disposed on the side of the first probe bracket (4031) away from the crack dynamic detection section body (401).

Images