Pipeline defect detection performance test experiment table

Abstract

The utility model relates to a pipeline defect detection performance test experiment table which comprises an outer rack, and an electric control general assembly structure is arranged on the outer rack in a supporting mode. A magnetic leakage performance detection device is arranged in the outer rack and comprises an arc-shaped pipeline, a driving device for driving the arc-shaped pipeline to rotate is connected to the magnetic leakage performance detection device, and the rotating speed and the rotating direction of the arc-shaped pipeline are adjustable; a signal acquisition device is arranged below the magnetic leakage performance detection device, the signal acquisition device comprises an adjustable magnetic leakage detection platform, the adjustable magnetic leakage detection platform is connected with a signal acquisition unit and a magnetization device, the adjustable magnetic leakage detection platform can adjust the detection position of the signal acquisition unit, and the driving device and the signal acquisition device are electrically connected with a control display part. According to the utility model, various working conditions of technical parameter combinations such as different movement rates and probe positions can be simulated, the magnetic flux leakage detection performance of the pipeline can be evaluated, the automatic acquisition and storage of experimental data can be completed, and reliable theoretical basis and powerful help can be provided for the development of a detector in the pipeline.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline detection technical field especially relates to a pipeline defect detection performance test experiment table. BACKGROUND

[0002] With the wide application of petroleum, natural gas and other energy, pipeline transportation has become one of the important transportation modes. However, due to internal medium corrosion, external environmental influence and geological disasters and other factors, various defects such as corrosion pits, cracks and deformation will inevitably occur in the long-term operation of the pipeline, which has great potential risk.

[0003] In the field of pipeline safety engineering, pipeline detection is a fundamental measure to ensure pipeline safety. With the help of pipeline detection means, the actual condition of the pipeline can be accurately grasped, effective strategies can be implemented in advance to prevent pipeline accidents and thus prolong the service life of the pipeline. Pipeline detection not only can avoid economic losses caused by pipeline accidents, but also can help pipeline owners to repair specific parts of the pipeline according to the detection results, without the need to carry out large-scale pipeline replacement operations, which can greatly reduce the cost. Among many pipeline detection technologies, magnetic flux leakage internal detection technology is the most widely used and mature pipeline defect detection method.

[0004] Chinese utility model patent application No. CN201910731039.3 discloses a pipeline magnetic flux leakage detection device, wherein the telescopic permanent magnet and the magnetic field sensor design can adapt to different pipe diameters, reducing the detection cost; the steel brush is attached to the inner wall of the pipeline to ensure the magnetization effect and improve the detection accuracy. However, the above device has the following defects: the magnetic field sensor is fixed after height adjustment, and cannot closely adhere to the pipe wall when the pipe wall is concave, affecting the accuracy; the telescopic part has reduced reliability after long-term use, and the height adjustment is limited, which is not suitable for pipelines with large changes in pipe diameter. Chinese utility model patent application No. CN202311834354.1 improves the shortcomings of the above patent, evenly distributes multiple magnetization components and magnetic flux leakage sensors in a ring shape, comprehensively detects the inner wall of the pipeline, and improves the coverage rate and accuracy; the elastic sheet drives the magnetic field detection sensor to adhere to the inner wall of the pipeline, and can still ensure good contact when the pipeline is deformed or has defects, improving the detection accuracy. However, at the same time, the elastic sheet and the torsional spring increase the complexity of the device and increase the maintenance cost; too many components moving in the pipeline are disturbed by factors such as fluid resistance, affecting the advancement and positioning of the detection equipment.

[0005] In the research and development process of oil and gas pipeline defect detection equipment, due to the high value and high risk of oil and gas pipelines, it is difficult to test the equipment in the real environment. At present, the long pipeline traction experiment method is generally used, but this method is difficult to operate in practice, and has high requirements for the complexity and stability, safety of the test site and equipment technology.

[0006] Therefore, it is urgent to provide an experimental platform capable of simulating various working conditions of different motion rates and probe positions and the like technical parameter combinations, evaluating pipeline magnetic flux leakage detection performance, and automatically collecting and storing experimental data, thereby providing reliable theoretical basis and powerful help for development of pipeline internal detectors.

[0007] Therefore, the inventors propose a pipeline defect detection performance test experimental platform based on years of experience and practice in the relevant industry to overcome the defects of the prior art. Content of the utility model

[0008] The pipeline defect detection performance test experimental platform can simulate various working conditions of different motion rates and probe positions and the like technical parameter combinations, evaluate pipeline magnetic flux leakage detection performance, and automatically collect and store experimental data, thereby providing reliable theoretical basis and powerful help for development of pipeline internal detectors.

[0009] The pipeline defect detection performance test experimental platform comprises an outer frame, an electric control assembly structure is supported and arranged on the outer frame, a magnetic flux leakage performance detection device is arranged in the outer frame, the magnetic flux leakage performance detection device comprises an arc-shaped pipeline capable of simulating an actual operation state of a pipeline and provided with a plurality of magnetic flux leakage defect units on a side wall, a central axis of a circle where the arc-shaped pipeline is located constitutes a first central axis, the first central axis is vertically arranged, a driving device for driving the arc-shaped pipeline to rotate around the first central axis is connected to the magnetic flux leakage performance detection device, and a rotating speed and direction of the arc-shaped pipeline are adjustably arranged, a signal acquisition device is arranged below the magnetic flux leakage performance detection device, the signal acquisition device comprises an adjustable magnetic flux leakage detection platform, a signal acquisition unit and a magnetizing device capable of being sleeved in the arc-shaped pipeline are connected to the adjustable magnetic flux leakage detection platform, the adjustable magnetic flux leakage detection platform can adjust a detection position of the signal acquisition unit, and the driving device and the signal acquisition device are electrically connected to a control display part.

[0010] In a preferred embodiment of the utility model, the adjustable magnetic flux leakage detection platform includes first mobile structure, second mobile structure, magnetic flux leakage card plate and sensor base, the sensor base is disc structure, the center axis of disc structure constitutes second center axis, second center axis is horizontally arranged, the diameter of disc structure is smaller than the pipe diameter size of arc pipeline, disc structure is connected on disc support through magnetic flux leakage card plate, disc support is connected on first mobile structure, second mobile structure includes a plurality of slide rods that can move along the radial direction of disc structure, the first rotation angle is arranged between two adjacent slide rods, the radial outer end of each slide rod is connected with a signal acquisition unit respectively, the slide rod moves along the radial direction of disc structure to drive signal acquisition unit moves along the axial and radial direction of magnetic flux leakage performance detection device, disc support is connected with magnetizing device on the axial both ends of disc structure, first mobile structure drives sensor base, second mobile structure, signal acquisition unit and magnetizing device move along the radial direction of magnetic flux leakage performance detection device.

[0011] In a preferred embodiment of the utility model, the first mobile structure includes first steering wheel, first driving gear is connected on first steering wheel, rack is connected on disc support, rack is connected with first driving gear, first steering wheel drives disc support, sensor base, second mobile structure, signal acquisition unit and magnetizing device move along the radial direction of magnetic flux leakage performance detection device through first driving gear and rack.

[0012] In a preferred embodiment of the utility model, the second mobile structure includes second steering wheel fixedly connected on disc structure, second driving gear is connected on second steering wheel, center gear is connected with second driving gear on the center of disc structure;

[0013] A plurality of radial rocker arms are arranged on the center gear, a groove wheel is arranged on the side of disc structure opposite to the center gear, a plurality of circular arc grooves are arranged on disc structure, a first connecting shaft is arranged in each circular arc groove, the two ends of first connecting shaft are connected with rocker arm and groove wheel respectively, a plurality of guide grooves are arranged on groove wheel, the first end of second connecting shaft is connected with each slide rod, the second end of second connecting shaft is sleeved in guide groove, second steering wheel drives groove wheel to rotate and swing through second driving gear, center gear, rocker arm, first connecting shaft, the rotation and swing of groove wheel is converted into the radial movement of slide rod along disc structure through guide groove and second connecting shaft.

[0014] In a preferred embodiment of the utility model, the magnetization device includes a steel brush arranged in a circular ring, the outer diameter of the steel brush is smaller than the pipe diameter of the arc-shaped pipeline, a magnet is connected in the steel brush, a yoke is connected to the magnet, and the yoke is connected to the disc support.

[0015] In a preferred embodiment of the utility model, the magnetic flux leakage performance detection device includes two arc-shaped pipelines located on the same circumference, the inner side in the radial direction and the two ends in the circumferential direction of each arc-shaped pipeline are arranged in an open manner to enable the magnetization device and the signal acquisition unit to be arranged in the arc-shaped pipeline, the bottom end of each arc-shaped pipeline is connected to the base, a bottom disc center plate is arranged on the base, a bottom disc center shaft extending downward is arranged on the bottom disc center plate at the position of the first center shaft, and the bottom disc center shaft is connected to the driving device.

[0016] In a preferred embodiment of the utility model, a plurality of photoelectric baffles extending downward and spaced in the circumferential direction are arranged on the bottom surface of the base, a photoelectric speed measurement unit is arranged below the magnetic flux leakage performance detection device, and the photoelectric speed measurement unit detects the rotating speed of the arc-shaped pipeline by sensing the photoelectric baffles.

[0017] In a preferred embodiment of the utility model, the magnetic flux leakage defects include rectangular defects, cylindrical holes, triangular corrosion pits and / or circular pits.

[0018] In a preferred embodiment of the utility model, the driving device includes a servo motor, the output shaft of the servo motor is arranged horizontally, the output shaft of the servo motor is connected to the bottom disc center shaft through a reduction box and a 90° steering reducer to drive the arc-shaped pipeline to rotate around the first center shaft.

[0019] In a preferred embodiment of the utility model, the electric control assembly structure includes an electric control bottom plate detachably connected to the outer rack, a driver and a main control board are arranged on the electric control bottom plate, and the electric control assembly structure further includes a battery connected to the outer rack through a battery plate.

[0020] According to the above, the pipeline defect detection performance test experiment table has the following beneficial effects:

[0021] The utility model focuses on the test problems of current oil and gas pipeline defect detection equipment. Because the oil and gas pipeline has high value and high risk, the test in the real environment is limited, and the long pipeline traction experiment is extremely difficult to implement due to the restriction of factors such as site, equipment and operation. The utility model effectively solves these problems and improves the pipeline detection research efficiency.

[0022] The signal acquisition device is designed finely, the magnetization effect is effectively improved, and therefore the accuracy of detection is improved; two-degree-of-freedom movement of the signal acquisition unit is realized through the adjustable magnetic flux leakage detection platform, the position of the signal acquisition unit can be flexibly adjusted, different types of signal acquisition units can be adapted, and the axial and radial movement ranges are accurately designed, so that different positions of the pipeline can be conveniently detected.

[0023] The control is accurate, the driving device can realize accurate adjustment of the rotation speed of the arc-shaped pipeline, and the accurate control is crucial for simulating the pipeline operation state under different working conditions.

[0024] The data acquisition and processing process is perfect, the signal acquisition device and the control display part are matched, the accuracy and timeliness of data are ensured, and user operation and data management are facilitated.

[0025] The utility model discloses adopt arc-shaped pipeline simulation pipeline actual operation state, make test bench structure relative compact, compared with linear pipeline test bench, it does not need long linear space to arrange pipeline, reduced space occupation, it is convenient for subsequent combination with other equipment, and the overall operation of test bench is more stable and reliable.

[0026] The utility model discloses can simulate various working conditions of different motion rate and probe position and other technical parameter combination, evaluate pipeline magnetic flux leakage detection performance, and complete experimental data automatic acquisition and storage, provide reliable theoretical basis and powerful help for the development of pipeline internal detector. BRIEF DESCRIPTION OF DRAWINGS

[0027] The following drawings only aim at illustrating and explaining the utility model, and do not limit the scope of the utility model. Among them:

[0028] Figure 1 It is the isometric view of the pipeline defect detection performance test experiment table of the utility model.

[0029] Figure 2 It is the front view of the corner of the pipeline defect detection performance test experiment table of the utility model.

[0030] Figure 3 It is the schematic view of the outer rack of the utility model.

[0031] Figure 4 It is the schematic view of the electric control assembly structure of the utility model.

[0032] Figure 5 It is the schematic view of the driving device of the utility model.

[0033] Figure 6 It is the schematic view of the magnetic flux leakage performance detection device of the utility model.

[0034] Figure 7 It is the bottom structure view of the magnetic flux leakage performance detection device.

[0035] Figure 8 It is the side view of the signal acquisition device located at the second steering engine.

[0036] Figure 9 It is the side view of the signal acquisition device located at the back side of the second steering engine.

[0037] Figure 10 It is the schematic view of the magnetizing device.

[0038] Figure 11a It is the front view of the multiple magnetic flux leakage defect units on the arc-shaped pipeline side wall.

[0039] Figure 11b It is the plan view of the multiple magnetic flux leakage defect units on the arc-shaped pipeline side wall.

[0040] Figure 12a It is the distribution plan view of the multiple magnetic flux leakage defect units on the arc-shaped pipeline side wall.

[0041] Figure 12b It is the Figure 12a m-m section view.

[0042] In the figure:

[0043] 1, outer frame;

[0044] 11, frame bottom beam; 12, frame top beam; 13, frame vertical beam; 14, L-shaped corner code; 15, T-shaped right-angle fixed corner code; 16, top end support beam; 17, bottom end support beam;

[0045] 2, electric control assembly structure;

[0046] 21, electric control bottom plate; 211, upper top fiber plate; 212, hinge; 213, battery plate; 22, battery; 23, driver; 24, main control board; 25, adapter plate;

[0047] 3, magnetic flux leakage performance detection device;

[0048] 31, arc-shaped pipeline; 32, base; 33, bottom disc center plate; 34, bottom disc center shaft; 35, photoelectric baffle; 36, photoelectric speed measurement unit; 37, reinforced fiber plate; 38, photoelectric door support;

[0049] 4, driving device;

[0050] 41, speed reducer; 42, 90° steering speed reducer; 43, cross beam bottom plate; 44, machine cover; 45, first square seat bearing; 46, second square seat bearing;

[0051] 5. The signal acquisition device;

[0052] 51. The adjustable magnetic flux leakage detection platform; 511. The first moving structure; 5111. The first steering engine; 5112. The first driving gear; 5113. The rack; 512. The second moving structure; 5121. The slide bar; 5122. The second steering engine; 5123. The second driving gear; 5124. The central gear; 5125. The rocker; 5126. The grooved wheel; 5127. The steering engine base plate; 513. The magnetic flux leakage card plate; 514. The sensor base; 515. The disc support; 516. The support beam; 517. The slide rail;

[0053] 52. The signal acquisition unit;

[0054] 53. The magnetization device; 531. The steel brush; 532. The magnet; 533. The yoke. DETAILED DESCRIPTION

[0055] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described with reference to the accompanying drawings.

[0056] The specific embodiments of the present application described herein are for the purpose of explanation and illustration only and are not to be construed as limiting the present application in any way. Those skilled in the art will be able to conceive of other possible variations within the scope of the present application based on the present application. It should be noted that when an element is referred to as being "provided on" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "mounting", "connection", and "connection" should be interpreted broadly, for example, they can be mechanical connections or electrical connections, or they can be internal connections between two elements, or they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meanings of the above terms according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used herein are for the purpose of illustration only and do not indicate the only implementation.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification of the present application herein is only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0058] As Figures 1 to 10 The utility model provides a pipeline defect detection performance test experiment table, including outer frame 1, the outer frame 1 is supported and is arranged electric control general assembly structure 2, the outer frame 1 is arranged in the leakage magnetic property detection device 3, and the leakage magnetic property detection device 3 includes the arc pipeline 31 of simulating pipeline actual operation state, the center axis of the circumference of arc pipeline 31 constitutes first center axis, and first center axis is vertically arranged, and a plurality of leakage magnetic defect units are arranged at intervals on arc pipeline 31, and the driving device 4 that drives arc pipeline 31 rotates around first center axis is connected on leakage magnetic property detection device 3, and the rotating speed and direction of arc pipeline 31 are adjustable, and the signal acquisition device 5 is arranged below leakage magnetic property detection device 3, and the main target of signal acquisition device 5 is to complete the detection of the defect of the pipeline running at uniform speed, and signal acquisition device 5 includes adjustable leakage magnetic detection platform 51, and the signal acquisition unit 52 (may be magnetic sensor) and magnetizing device 53 that can be fitted in arc pipeline 31 are connected on adjustable leakage magnetic detection platform 51, and adjustable leakage magnetic detection platform 51 can adjust the detection position of signal acquisition unit 52, that is, the position of signal acquisition unit 52 relative to the inner wall of arc pipeline 31 is adjustable, and the position adjustment includes the axial and radial movement of signal acquisition unit 52 along leakage magnetic property detection device 3, that is, signal acquisition unit 52 can realize two degrees of freedom movement (horizontal and vertical movement) relative to leakage magnetic property detection device 3, and magnetizing device 53 can move along the radial direction of leakage magnetic property detection device 3 (horizontal movement), and the adjustment position satisfies the magnetization requirement, and driving device 4, signal acquisition device 5 are electrically connected to the control display part (not shown in the figure, the computer of remote setting can be).

[0059] Driving device 4 drives arc pipeline 31 to rotate around first center axis at set speed, that is, arc pipeline 31 rotates relative to signal acquisition device 5, magnetizing device 53 magnetizes arc pipeline 31 locally to magnetic saturation state, signal acquisition unit 52 collects the leakage magnetic signal caused by leakage magnetic defect unit, and converts the strength of magnetic field into the size of electric signal, and the control display part (host computer) identifies and processes the collected signal, performs waveform display and stores data in computer software.

[0060] The pipeline defect detection performance test experiment table provided by the utility model focuses on the test problem of current oil and gas pipeline defect detection equipment. Because oil and gas pipeline is of high value and high risk, the test in real environment is limited, and long pipeline traction experiment is extremely difficult to implement due to the restriction of site, equipment, operation and other factors. The utility model effectively solves these problems and improves the pipeline detection research efficiency.

[0061] The signal acquisition device 5 is designed to be fine, effectively improves the magnetization effect, thereby improving the accuracy of detection; the two-degree-of-freedom movement of the signal acquisition unit 52 is realized through the adjustable magnetic flux leakage detection platform 51, the position of the signal acquisition unit 52 can be flexibly adjusted, different types of signal acquisition units 52 are adapted, and the axial and radial movement ranges are accurately designed, so that the detection of different positions of the pipeline is facilitated;

[0062] The control is accurate, the driving device 4 can realize accurate adjustment of the rotation speed of the arc-shaped pipeline 31, and the accurate control is crucial for simulating the pipeline running state under different working conditions;

[0063] The data acquisition and processing process is perfect, the signal acquisition device 5 and the control display part cooperate, the accuracy and timeliness of data are ensured, user operation and data management are facilitated;

[0064] The utility model discloses adopt arc-shaped pipeline simulation pipeline actual running state, make test bench structure relative compact, compared with linear type pipeline test bench, it does not need very long straight line space to arrange pipeline, reduced space occupation, it is convenient for subsequent and other equipment combination use, test bench whole operation is more stable and reliable;

[0065] The utility model discloses can simulate various working conditions of different motion rate and probe position and other technical parameter combination, evaluate pipeline magnetic flux leakage detection performance, and complete experimental data automatic acquisition and storage, provide reliable theoretical basis and powerful help for the development of pipeline detector.

[0066] Further, as shown in Figure 8 、 Figure 9 The adjustable magnetic flux leakage detection platform 51 comprises a first moving structure 511, a second moving structure 512, a magnetic flux leakage card plate 513 and a sensor base 514.

[0067] The sensor base 514 is a disc structure, the central axis of the disc structure constitutes a second central axis, the second central axis is horizontally arranged, and the diameter of the disc structure is smaller than the pipe diameter size of the arc-shaped pipeline 31; the disc structure is connected to the disc support 515 through the magnetic flux leakage card plate 513, and the disc support 515 is connected to the first moving structure 511.

[0068] The second moving structure 512 comprises a plurality of slide rods 5121 capable of moving in the radial direction of the disc structure, and the first rotation angle is arranged between adjacent two slide rods 5121; the radial outer ends of the slide rods 5121 are respectively connected to a signal acquisition unit 52, the slide rods 5121 move in the radial direction of the disc structure, so that the signal acquisition units 52 connected to the outer ends of the slide rods 5121 move in the radial direction of the disc structure, the radial movement can be decomposed into axial and radial movements of the magnetic flux leakage performance detection device 3, and the radial movement can adjust the distance between the signal acquisition unit 52 and the pipe wall of the arc-shaped pipeline 31.

[0069] The disc support 515 is connected to the magnetization device 53 at the axial ends of the disc structure; the magnetization device 53 locally magnetizes the arc-shaped pipeline 31 to a magnetic saturation state.

[0070] The first moving structure 511 drives the sensor base 514, the second moving structure 512, the signal acquisition unit 52 and the magnetization device 53 to move along the radial direction of the magnetic flux leakage performance detection device 3,

[0071] The first moving structure 511 and the second moving structure 512 cooperate to realize the movement of the signal acquisition unit 52 in two degrees of freedom, flexibly adjust the position of the signal acquisition unit 52, adapt to different types of signal acquisition units 52, and accurately design the axial and radial movement ranges, which is convenient for detecting different positions of the pipeline.

[0072] Further, as shown in Figure 9 The first moving structure 511 includes a first steering engine 5111, a first driving gear 5112 connected to the first steering engine 5111, and a rack 5113 connected to the disc support 515, the rack 5113 being meshed and connected with the first driving gear 5112. The first steering engine 5111 drives the disc support 515, the sensor base 514, the second moving structure 512, the signal acquisition unit 52 and the magnetization device 53 to move along the radial direction of the magnetic flux leakage performance detection device 3 through the first driving gear 5112 and the rack 5113.

[0073] The adjustable magnetic flux leakage detection platform 51 includes horizontally arranged and parallel support cross beams 516 (aluminum pipe cross beams), each support cross beam 516 being provided with a sliding rail 517, and the bottom surface of the disc support 515 being provided with a sliding block capable of being slidably sleeved on the sliding rail 517.

[0074] Two clamping grooves are symmetrically arranged on the disc structure, and a magnetic flux leakage clamping plate 513 is clamped in each clamping groove, the two ends of the magnetic flux leakage clamping plate 513 being connected to the disc support 515.

[0075] Further, as shown in Figure 8As shown, the second moving structure 512 comprises a second steering engine 5122 fixedly connected to the disc structure, specifically, the second steering engine 5122 is connected to the disc structure through a steering engine bottom plate 5127; a second driving gear 5123 is connected to the second steering engine 5122; a central gear 5124 meshing with the second driving gear 5123 is connected at the center of the disc structure; a plurality of radial extending rocker arms 5125 are arranged on the central gear 5124; a groove wheel 5126 is arranged on the side of the disc structure opposite to the central gear 5124; a plurality of circular arc grooves are arranged on the disc structure, and a first connecting shaft is arranged in each circular arc groove, and the two ends of the first connecting shaft are connected with the rocker arm 5125 and the groove wheel 5126 respectively; a plurality of guide grooves are arranged on the groove wheel 5126, each sliding rod 5121 is connected with the first end of a second connecting shaft, and the second end of each second connecting shaft is sleeved in the guide groove; the second steering engine 5122 drives the groove wheel 5126 to rotate and swing through the second driving gear 5123, the central gear 5124, the rocker arm 5125 and the first connecting shaft, and the rotation and swing of the groove wheel 5126 is converted into the radial movement of the sliding rod 5121 through the guide groove and the second connecting shaft.

[0076] In a specific embodiment, the number of the sliding rods 5121 is 6, and 6 signal acquisition units 52 (magnetic sensitive sensors) are respectively installed at the ends (radial outer ends) of the 6 sliding rods 5121.

[0077] Further, as shown in Figure 10 , the magnetization device 53 comprises a steel brush 531 arranged in a circular ring shape, the outer diameter size of the steel brush 531 is smaller than the pipe diameter size of the arc-shaped pipeline 31, a magnet 532 is connected in the steel brush 531, a yoke 533 is connected to the magnet 532, and the yoke 533 is connected to the disc support 515.

[0078] The utility model optimizes the geometric parameters of the magnet 532 (permanent magnet) in the magnetization device 53, effectively improves the magnetization effect, and improves the accuracy of detection.

[0079] Further, as shown in Figure 1 , Figure 2 , Figure 6 , Figure 7 In a specific embodiment, the magnetic flux leakage performance detection device 3 comprises two arc-shaped pipelines 31 located on the same circumference, the radial inner side and the circumferential two ends of each arc-shaped pipeline 31 are arranged in an open manner to enable the magnetization device 53 and the signal acquisition unit 52 to be arranged in the arc-shaped pipeline 31; the bottom end of each arc-shaped pipeline 31 is connected to the base 32; the base 32 is provided with a bottom disc center plate 33, the bottom disc center plate 33 is provided with a bottom disc center shaft 34 extending downward at the position of the first center shaft, and the bottom disc center shaft 34 is connected to the driving device 4.

[0080] Further, as shown in Figure 1 , Figure 2、 Figure 6 、 Figure 7 As shown in the drawings, the bottom surface of the base 32 is provided with a plurality of circumferentially spaced and downwardly extending photoelectric baffles 35, and the lower side of the magnetic flux leakage performance detection device 3 is provided with a photoelectric speed measurement unit 36, which detects the rotation speed of the arc-shaped pipeline 31 by sensing the photoelectric baffles 35.

[0081] In combination Figure 2 , the photoelectric speed measurement unit 36 (photoelectric gate) is installed at the bottom of the outer rack 1 (the bottom of the experimental table), below the arc-shaped pipeline 31 (the measured pipeline), and the radial position corresponds to the photoelectric baffles 35 (acrylic photoelectric baffles). Its working process is that each time the photoelectric baffles 35 pass through the photoelectric speed measurement unit 36, the sensor state at the photoelectric speed measurement unit 36 changes, and the timer counts accordingly. The actual speed is obtained by dividing the distance between the two photoelectric baffles 35 by the time difference between the two state changes of the photoelectric speed measurement unit 36. Then, the size of the front and rear speeds is compared to feedback the acceleration, deceleration or uniform speed state of the measured pipeline, thereby creating the best detection environment for the signal acquisition device 5.

[0082] Further, as shown in Figure 11a 、 Figure 11b , the plurality of magnetic flux leakage defect units provided on the arc-shaped pipeline 31 include rectangular defects, cylindrical holes, triangular corrosion and / or circular pits.

[0083] In actual situations, pipelines are mainly affected by corrosion and can produce various irregularly shaped defects, among which cracks, grooves, holes and asymmetric corrosion are the main parts. The present application simplifies the complex defect shape, and refers to Figure 11a 、 Figure 11b 、 Figure 12a 、 Figure 12b In the arc-shaped pipeline 31, rectangular defects, cylindrical holes, triangular corrosion pits and circular pits of different sizes and depths are designed, and the uniform distribution principle is followed, such as Xa, Ye, etc., to avoid the mutual influence between the defect parts.

[0084] To show the positioning of the pipeline defects in the axial and circumferential directions, three-dimensional coordinates are established as shown in Figure 12a and 12b .

[0085] ① Figure 12a . The bending center of the pipeline is taken as the origin O, and the X' and Y' directions are as shown in the figure, wherein the Z' direction is perpendicular to the paper outwardly passing through the O point. In the top view of the defect pipeline, the pipeline is divided into upper and lower parts, which are symmetrically distributed, and the arc of one half of the pipeline is 150°. In order to avoid the mutual influence between the defect parts, the uniform distribution principle is followed, and the top view of the pipeline is divided into eight positions a, b, c, d, e, f, g and h as shown in the figure, and the included angle between adjacent two positions is 30°.

[0086] ii Figure 12b In the defect pipeline's view section diagram m-m, the pipeline is divided into three parts X, Y, Z as shown, the included angle between adjacent 2 positions is 60 °.

[0087] In a specific embodiment of the utility model, as shown in Figure 6 、 Figure 7 The base 32 is an aluminum square tube base, the arc-shaped pipeline 31 is fixedly connected with the reinforcing fiber plate 37 through a bolt pair, the reinforcing fiber plate 37 is fixedly connected with the base 32 through a bolt pair, the center plate 33 of the base is a carbon fiber plate, the center plate 33 of the base is fixedly connected with the base 32 through a bolt pair, the photoelectric baffle 35 is fixedly connected with the base 32 through a bolt pair, the photoelectric speed measuring unit 36 is a photoelectric gate, and the photoelectric gate support 38 supporting the photoelectric gate is fixedly connected with the outer rack 1 through an aluminum column.

[0088] Further, as shown in Figure 4 The driving device 4 includes a servo motor, the output shaft of the servo motor is horizontally arranged, the output shaft of the servo motor is connected with the center shaft 34 of the base through a reduction box 41 and a 90 ° steering reducer 42 to drive the arc-shaped pipeline 31 to rotate around the first center shaft.

[0089] The servo motor can be adjusted in speed and drives the arc-shaped pipeline 31 (the pipeline to be measured) to rotate. The utility model selects the servo motor as a power source, compared with the low-frequency vibration defect of the stepper motor when losing steps and at low speed, the servo motor can meet the higher requirement of the experiment on speed accuracy. Since the volume of the motor itself is too long, in order to reduce the gravity height of the overall experimental device, a 90 ° steering reducer 42 is arranged between the servo motor and the magnetic flux leakage performance detection device 3.

[0090] In a specific embodiment of the utility model, as shown in Figure 5 The 90 ° steering reducer 42 is supported and arranged on the cross beam bottom plate 43, the 90 ° steering reducer 42 is buckled with a machine cover 44, the machine cover 44 is provided with a center shaft through hole, the machine cover 44 is connected with a first square seat bearing 45, the bottom surface of the center plate 33 of the base is connected with a second square seat bearing 46, and the center shaft 34 of the base is connected to the 90 ° steering reducer 42 after being rotatably arranged through the second square seat bearing 46 and the first square seat bearing 45. The cross beam bottom plate 43 is fixedly connected with the outer rack 1 through a bolt pair, the first square seat bearing 45 is fixedly connected with the machine cover 44 through a bolt pair, and the reduction box 41 is fixedly connected with the 90 ° steering reducer 42 through a bolt pair.

[0091] The magnetic flux leakage performance detection device 3 containing the arc-shaped pipeline 31 is combined with the 90° turning reducer 42. On the one hand, the magnetic flux leakage performance detection device 3 itself is relatively compact in structure, compared with the linear pipeline test bench, it does not need a very long linear space to arrange the pipeline, reduces the space occupation, and is convenient for subsequent combination with other equipment; on the other hand, the motor controller is used to control the servo motor to drive the magnetic flux leakage performance detection device 3 to rotate through the gear transmission, at the same time, the 90° turning reducer 42 is used between the servo motor and the magnetic flux leakage performance detection device 3 (traveling device) to reduce the gravity center, which is a novel design, can simulate the actual running state of the pipeline, and improve the stability of the test bench.

[0092] Further, as shown in Figure 1 、 Figure 4 , the electric control assembly structure 2 includes an electric control bottom plate 21 detachably connected to the outer rack 1, a driver 23 and a main control board 24 are arranged on the electric control bottom plate 21; the electric control assembly structure 2 further includes a battery 22, and the battery 22 is connected to the outer rack 1 through a battery plate 213.

[0093] The functions of the driver 23 are as follows:

[0094] ①Driving the motor to operate. Receiving the pulse signal sent by the STM32 host, converting it into an electric signal for driving the servo motor to operate, so that the servo motor can rotate according to the instructions sent by the PC, and providing power source for the whole test bench.

[0095] ②Speed feedback control. Receiving the rotation speed feedback signal detected by the encoder (an element for detecting the rotation speed of the center shaft 34 of the chassis, prior art, which can be installed at a proper position according to the actual working condition), adjusting the driving signal output to the servo motor according to the feedback information, realizing accurate control of the rotation speed of the servo motor, and ensuring that the experimental device can stably operate at the set minimum speed state.

[0096] The functions of the main control board 24 are as follows:

[0097] ①Transmitting instructions. The main control board 24 is a key component for transmitting instructions, receiving PC instructions and analyzing, converting into pulse signals and sending to the servo motor driver (prior art) to control the servo motor to operate. At the same time, according to the experimental process, the first steering wheel 5111 and the second steering wheel 5122 are coordinated, after the device reaches the minimum stable operation speed, the pulse is adjusted to adjust the position of the magnetic sensitive sensor platform, and the cooperation of each component is ensured.

[0098] ②Monitor and correct the operating parameters. The main control board 24 monitors the device running state in real time, receives the speed feedback of the encoder (an element for detecting the rotating speed of the center shaft 34 of the chassis) and the linear speed feedback of the photoelectric sensor (the photoelectric speed measuring unit 36), and compares with the preset parameters. If the rotating speed and the linear speed are found to be abnormal, the pulse adjustment amount is calculated according to the algorithm, the pulse signal sent to the servo motor driver is adjusted, the deviation is corrected, and the stable operation of the experiment is ensured.

[0099] The battery 22 functions as follows:

[0100] Power supply. The STM32 main control board (the main control board 24), the servo motor driver, the steering wheel (the first steering wheel 5111 and the second steering wheel 5122), the encoder (an element for detecting the rotating speed of the center shaft 34 of the chassis) and the photoelectric sensor (the photoelectric speed measuring unit 36) are powered. At the same time, as an independent power supply unit, it effectively blocks external power supply interference, stably supplies voltage and current to the system, improves the anti-interference ability of the system, and ensures the stable working state of each component.

[0101] In a specific embodiment of the utility model, as shown in Figure 4 The electric control bottom plate 21 includes an upper top fiber plate 211 and a hinge 212, the first end of the hinge 212 is connected to the outer rack 1, the second end of the hinge 212 is fixedly connected to the upper top fiber plate 211 through the adapter plate 25, and the driver 23 and the main control board 24 are connected to the upper top fiber plate 211.

[0102] In a specific embodiment of the utility model, STM32f407 is used as a controller (the main control board 24), the speed of the servo motor is controlled through the PWM function, and accurate speed regulation can be realized. This accurate control is crucial for simulating the running state of the pipeline under different working conditions.

[0103] Further, as shown in Figure 1 、 Figure 2 、 Figure 3As shown, the outer frame 1 includes a frame bottom beam 11, a frame top beam 12, a frame vertical beam 13, four frame bottom beams 11 are connected by four L-shaped corner codes 14, four frame top beams 12 are connected by four L-shaped corner codes 14 (fixedly connected by bolt pairs), two frame vertical beams 13 are connected between each side frame bottom beam 11 and frame top beam 12, the two ends of the frame vertical beam 13 are connected to the frame bottom beam 11 and the frame top beam 12 through the T-shaped right-angle fixed corner code 15 (fixedly connected by bolt pairs), the top end support beam 16 is connected between the opposite frame top beams 12 (fixedly connected by bolt pairs), and the electric control assembly structure 2 is connected to the top end support beam 16; the bottom end support beam 17 is connected between the opposite frame bottom beams 11 (fixedly connected by bolt pairs), the photoelectric gate support 38 and the driving device 4 are installed on the bottom end support beam 17, and specifically, the photoelectric gate support 38 is fixedly connected to the bottom end support beam 17 through an aluminum column, and the cross beam bottom plate 43 of the driving device 4 is connected to the bottom end support beam 17.

[0104] Further, the control display part has a special software, which has four functions, including control function, monitoring function, alarm function and storage function. The control function can achieve the start and stop of the measured pipeline, forward and reverse rotation and constant speed operation, and can also adjust the position of the signal acquisition unit 52 (optionally a Hall sensor) relative to the inner wall of the pipeline (the arc-shaped pipeline 31); the monitoring function can read the detection value of the signal acquisition unit 52 (the Hall sensor) in real time and display it in a waveform diagram, and can also detect the running speed of the arc-shaped pipeline 31 in real time and display the numerical value; the alarm function is to ensure data accuracy and experimental safety, and when the magnetic flux leakage performance detection device 3 is accelerated or stopped suddenly, the control software will alarm and send a stop command to the experiment table; the storage function sets a data buffer area for each signal acquisition unit 52, and the data structure is a group of current values and times, and after the experiment is completed, the data can be stored as a txt file in the local computer for subsequent processing.

[0105] The foregoing special software makes the data acquisition and processing process perfect. The appropriate signal acquisition unit 52 (sensor) is selected to collect the magnetic field signal and the pipeline speed feedback, so as to ensure the accuracy and timeliness of the data. The software function of the control display part is complete, which not only can realize the control of the running of the arc-shaped pipeline 31 and the position of the signal acquisition unit 52 (sensor), but also can realize the real-time monitoring and alarm of the detection data, and can store the experimental data in a specific format and realize data transmission through serial communication, so as to realize the close combination of the software and the hardware system, and facilitate user operation and data management.

[0106] The use process of the pipeline defect detection performance test experiment table is as follows:

[0107] (1) Run the drive device 4. In this set of drive system, PC sends instructions to control STM32 host (main control board 24) to send pulse to servo motor driver (prior art) to drive servo motor to rotate, combined with Figure 5 , the servo motor rotates through the reduction box 41, the 90° steering reducer 42 to provide power for the magnetic flux leakage performance detection device 3, so that the magnetic flux leakage performance detection device 3 enters the lowest speed running state, and the encoder (prior art) detects the rotating speed of the center shaft 34 of the chassis and feeds back to the servo motor driver. Combined with Figure 2 , the photoelectric speed measurement unit 36 (photoelectric gate) is installed at the bottom of the outer rack 1 (the bottom of the experiment table), below the arc-shaped pipeline 31 (the measured pipeline), and the radial position corresponds to the photoelectric baffle 35 (acrylic photoelectric baffle). Its working process is that every time the photoelectric baffle 35 passes through the photoelectric speed measurement unit 36, the sensor state at the photoelectric speed measurement unit 36 changes, and the timer counts correspondingly. The actual speed is obtained by dividing the distance between the two photoelectric baffles 35 by the time difference between the two state changes of the photoelectric speed measurement unit 36. Then compare the size of the front and rear speed to feedback the acceleration, deceleration or uniform speed state of the measured pipeline, and further create the best detection environment for the signal acquisition device 5.

[0108] (2) Run the signal acquisition device 5 (signal detection system). The main process is first to use the adjustable magnetic flux leakage detection platform 51 to move the signal acquisition unit 52 and the magnetizing device 53 into the arc-shaped pipeline 31, and then start the drive device 4 to make the arc-shaped pipeline 31 rotate relative to the signal acquisition device 5 at a set speed,

[0109] Then the magnetizing device 53 magnetizes the arc-shaped pipeline 31 locally to the magnetic saturation state, and then controls the display part (upper computer) to control the adjustable magnetic flux leakage detection platform 51 (two-dimensional platform) to adjust the signal acquisition unit 52 (magnetic sensor) to lift off the value. On this basis, the signal acquisition unit 52 (magnetic sensor) collects the magnetic flux leakage signals caused by defects, and converts the strength of the magnetic field into the size of the electric signal. Finally, the display part (upper computer) identifies and processes the collected signals, displays the waveform and stores the data in the computer software.

[0110] Among them, the signal acquisition unit 52 adjustment process includes: sending pulses to the first steering wheel 5111 and the second steering wheel 5122 through the display part to adjust the adjustable magnetic flux leakage detection platform 51.

[0111] Combined with Figure 8 , Figure 9The power input part of the first moving structure 511 is a first steering engine 5111, the first steering engine 5111 transmits power to a rack 5113 through a first driving gear 5112, the rack 5113 is connected with a disc support 515, the disc support 515 is provided with a slide rail 517 and a slide block at the bottom, and the disc support 515 bears the whole second moving structure 512. Thus, the overall linear movement of the sensor base 514 along the radial direction of the magnetic flux leakage performance detection device 3 is realized through the circumferential movement of the steering engine.

[0112] The power input part of the second moving structure 512 is a second steering engine 5122, the second steering engine 5122 transmits power to a central gear 5124 through a gear pair, and drives a back groove wheel 5126 to rotate. The back of the second steering engine 5122 is a groove wheel mechanism, when the groove wheel 5126 is driven to rotate by a power source, the linear radial movement of six slide rods 5121 is realized through the rotation pair of the groove wheel.

[0113] The utility model discloses a detection of pipeline magnetic field intensity in different positions through control signal acquisition unit 52 (magnetic sensor) realizes automatic detection.

[0114] ③Using operation display machine software.

[0115] In the main control interface, the experimental personnel can complete the adjustment of the position of the signal acquisition device 5 and the running speed of the magnetic flux leakage performance detection device 3, and the specific implementation mode is that STM32 utilizes switch signals and PWM pulses to complete the control of various components. In the experimental process, the current state of each sensor can also be observed. Moreover, after the experimental observation is finished, the data of each can also be stored to the local computer, so that secondary analysis is facilitated.

[0116] The utility model discloses a complete control system that adopts controller, encoder, photoelectric sensor, magnetic sensor, servo motor driver, servo motor and steering mechanism, so that the whole test experiment is accurately controllable.

[0117] The specific operation process of the specific embodiment of the utility model is as follows:

[0118] ①When the experiment starts, first manually rotate the magnetic flux leakage performance detection device 3, and observe whether it normally runs and whether there is foreign matter blocking;

[0119] ②If the running is normal, check whether the computer (control display part) is successfully connected with the experimental device, and check whether the COM6 port of CH340 is connected in the device manager;

[0120] ③Press the battery button to check the power, when the light is sufficient, first press and then long press to complete the power-on, and simultaneously turn on the device start button, the experimental device is started, and the main control board LED light flashes uniformly;

[0121] (4) Open the host computer software in the computer, select COM6 port, and click '' open serial port '';

[0122] (5) Click '' ON '' in the motor option, and the magnetic flux leakage performance detection device 3 starts to rotate, and when it is observed that the main control panel LED light still flickers uniformly, it indicates that the device starts successfully;

[0123] (6) Click '' receive data '' to accept the data in the signal acquisition unit 52 (magnetic sensor), wherein 1, 2 and 3 serial ports are connected with the sensor, and 4, 5 and 6 serial ports are not connected, providing a platform for subsequent development;

[0124] (7) Continue to increase the speed by clicking '' speed + '', and pay attention to the frequency of clicking, otherwise it will affect the stability of the experimental device;

[0125] (8) Observe the voltage value change in the three sensor windows when passing through the defect in the experiment;

[0126] (9) Click '' OFF '' in the motor option when stopping the experiment, and finally the device stops slowly, and the sensor value is notified to receive;

[0127] (10) Click '' close serial port '', and the experimental data obtained is stored in the list, and the.txt file is displayed in the form of value + time, and the experiment is ended.

[0128] As described above, the pipeline defect detection performance test experiment table has the following beneficial effects:

[0129] The utility model pays attention to the current oil and gas pipeline defect detection equipment test problem. Because oil and gas pipeline is high value and high risk, it is limited in real environment test, and long section pipeline traction experiment is restricted by site, equipment, operation and other factors, and it is extremely difficult to implement. The utility model effectively solves these problems and improves the pipeline detection research efficiency.

[0130] The signal acquisition device of the utility model is designed finely, the magnetization effect is effectively improved, and the accuracy of detection is improved; the two-degree-of-freedom movement of the signal acquisition unit is realized through the adjustable magnetic flux leakage detection platform, the position of the signal acquisition unit can be flexibly adjusted, different types of signal acquisition units can be adapted, and the axial and radial movement ranges are accurately designed, so that the detection of different positions of the pipeline is facilitated.

[0131] The control is accurate, the driving device can realize accurate adjustment of the rotation speed of the arc-shaped pipeline, and the accurate control is crucial for simulating the pipeline running state under different working conditions.

[0132] The data acquisition and processing process of the utility model is perfect, the signal acquisition device and the operation display part cooperate, the accuracy and timeliness of the data are ensured, and the user operation and data management are facilitated.

[0133] The utility model adopts the arc pipeline simulation pipeline actual operation state, makes the experiment table structure relative compact, compares it not to need very long straight line space to arrange pipeline, reduces the space occupation, is convenient for subsequent combination use with other equipment, and the experiment table whole operation is more stable and reliable.

[0134] The utility model can simulate various working conditions of different motion rates and probe position and other technical parameter combinations, evaluate pipeline magnetic flux leakage detection performance, and complete automatic acquisition and storage of experimental data, provide reliable theoretical basis and powerful help for development of pipeline internal detector.

[0135] The above merely illustrates the specific implementation of the utility model, and is not used to limit the scope of the utility model. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principles of the utility model shall belong to the scope of protection of the utility model.

Claims

1. A test bench for testing the performance of a pipeline defect detector, characterized in that, The utility model provides a kind of pipeline leakage magnetic performance detection device, including outer frame, electric control assembly structure is arranged on the support of outer frame;Leakage magnetic performance detection device is arranged in the outer frame, the leakage magnetic performance detection device includes the arc pipeline that can simulate pipeline actual operating state, side wall is provided with multiple leakage magnetic defect units, the central axis of the circumference where the arc pipeline is located constitutes first central axis, and the first central axis is vertically arranged;Driving device is connected on the leakage magnetic performance detection device, and the driving device drives the arc pipeline to rotate around the first central axis, and the rotation speed and direction of the arc pipeline are adjustable;Signal acquisition device is arranged below the leakage magnetic performance detection device, and the signal acquisition device includes adjustable leakage magnetic detection platform, signal acquisition unit and magnetizing device can be sleeved in the arc pipeline and are connected on the adjustable leakage magnetic detection platform, the adjustable leakage magnetic detection platform can adjust the detection position of the signal acquisition unit, and the driving device and the signal acquisition device are electrically connected with control display part.

2. The test bench for testing performance of a pipeline defect detector according to claim 1, wherein, The adjustable leakage magnetic detection platform includes a first moving structure, a second moving structure, a leakage magnetic card plate, and a sensor base; The sensor base is a disc structure, the central axis of the disc structure constitutes a second central axis, the second central axis is horizontally arranged, and the diameter of the disc structure is smaller than the pipe diameter size of the arc pipeline;The disc structure is connected to a disc support through the leakage magnetic card plate, and the disc support is connected to the first moving structure;The second moving structure includes a plurality of slide rods that can move radially along the disc structure, adjacent two slide rods are arranged at a first rotation angle, the radial outer end of each slide rod is connected to a signal acquisition unit, and the slide rods move radially along the disc structure to drive the signal acquisition units to move axially and radially along the leakage magnetic performance detection device;The disc support is connected to the magnetizing device at the axial ends of the disc structure;The first moving structure drives the sensor base, the second moving structure, the signal acquisition units, and the magnetizing device to move radially along the leakage magnetic performance detection device.

3. The test bench for testing performance of a pipeline defect detector according to claim 2, wherein, The first moving structure includes a first steering wheel, a first driving gear is connected to the first steering wheel, a rack is connected to the disc support, the rack is meshed and connected with the first driving gear, and the first steering wheel drives the disc support, the sensor base, the second moving structure, the signal acquisition units, and the magnetizing device to move radially along the leakage magnetic performance detection device through the first driving gear and the rack.

4. The test bench for testing performance of a pipeline defect detector according to claim 2, wherein, The second moving structure comprises a second steering engine fixedly connected to the disc structure, a second driving gear connected to the second steering engine, and a central gear connected to the second driving gear at the center of the disc structure; a plurality of radial extending rocker arms are arranged on the central gear, and a groove wheel is arranged on the side of the disc structure opposite to the central gear; a plurality of circular arc grooves are arranged on the disc structure, a first connecting shaft is arranged in each circular arc groove, and the two ends of the first connecting shaft are connected to the rocker arm and the groove wheel respectively; a plurality of guide grooves are arranged on the groove wheel, the first end of a second connecting shaft is connected to each slide rod, and the second end of each second connecting shaft is sleeved in the guide groove; the second steering engine drives the groove wheel to rotate and swing through the second driving gear, the central gear, the rocker arm, and the first connecting shaft, and the rotation and swing of the groove wheel is converted into the radial movement of the slide rod along the disc structure through the guide groove and the second connecting shaft.

5. The test bench for testing performance of a pipeline defect detector according to claim 2, wherein, The magnetizing device comprises a steel brush arranged in a circular ring shape, the outer diameter of the steel brush is smaller than the pipe diameter of the arc-shaped pipeline, a magnet is connected in the steel brush, a yoke is connected to the magnet, and the yoke is connected to the disc support.

6. The test bench for testing performance of a pipeline defect detector according to claim 2, wherein, The magnetic flux leakage performance detection device comprises two arc-shaped pipelines arranged on the same circumference, the radial inner side and the circumferential two ends of each arc-shaped pipeline are arranged in an open manner to enable the magnetizing device and the signal acquisition unit to be arranged in the arc-shaped pipeline; the bottom end of each arc-shaped pipeline is connected to the base; the base is provided with a bottom disc center plate, a bottom disc center shaft extending downward is arranged on the bottom disc center plate at the position of the first center shaft, and the bottom disc center shaft is connected to the driving device.

7. The test bench for testing performance of a pipeline defect detector according to claim 6, wherein, The bottom surface of the base is provided with a plurality of circumferentially spaced and downward extending photoelectric baffles, and a photoelectric speed measurement unit is arranged below the magnetic flux leakage performance detection device; the photoelectric speed measurement unit detects the rotation speed of the arc-shaped pipeline by sensing the photoelectric baffles.

8. The test bench for testing performance of a pipeline defect detector according to claim 6, wherein, The magnetic flux leakage defect units comprise rectangular defects, cylindrical holes, triangular corrosion pits, and / or circular pits.

9. The test bench for testing performance of a pipeline defect detector according to claim 6, wherein, The driving device comprises a servo motor, the output shaft of the servo motor is arranged horizontally, and the output shaft of the servo motor is connected to the bottom disc center shaft through a reduction box and a 90° turning reducer to drive the arc-shaped pipeline to rotate around the first center shaft.

10. The test bench for testing performance of a pipeline defect detector according to claim 1, wherein, The electric control assembly structure comprises an electric control bottom plate detachably connected to the outer rack, and a driver and a master control board are arranged on the electric control bottom plate; the electric control assembly structure further comprises a battery connected to the outer rack through a battery plate.

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