An intelligent ultrasonic detection system and detection method for high-parameter polyethylene composite pipe electric fusion joints

Abstract

The present invention relates to the field of pipe inspection technology, and in particular to an intelligent ultrasonic inspection system and inspection method for high-parameter polyethylene composite pipe electric fusion joints, comprising an ultrasonic automatic inspection device and a ferromagnetic clamp guide rail, wherein the ferromagnetic clamp guide rail is sleeved on the high-parameter polyethylene composite pipe, and the ultrasonic automatic inspection device comprises a fixed guide wheel device, a detection trolley, a vehicle body mainboard, a lateral movement device, and a probe device. The lateral movement device drives the probe device to align the position with the electric fusion joint on the high-parameter polyethylene composite pipe, and then drives the detection trolley to perform circular motion on the ferromagnetic clamp guide rail, so that it drives the probe device to scan the electric fusion joint on the high-parameter polyethylene composite pipe in a C-shaped path. The ultrasonic phased array probe adopts a line scan and a fan scan supplementary method for scanning, which can move more smoothly to achieve three-dimensional imaging of defects, more accurately locate defects, and improve detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe detection, and in particular to an intelligent ultrasonic detection system and a detection method for high-parameter polyethylene composite pipe electric fusion joints. Background Art

[0002] Currently, traditional pipes used in my country are mainly divided into two categories: metal pipes and non-metallic pipes. Due to the characteristics of the material itself, metal pipes have advantages such as high strength and mature connection technology, but they have disadvantages such as rust and corrosion. Non-metallic pipes, represented by polyethylene pipes, have advantages such as high flexibility and corrosion resistance, but have disadvantages such as low strength and rigidity.

[0003] As the application of pipelines becomes increasingly extensive, different service environments place higher and more stringent requirements on pipelines. To this end, people combine the high strength of metal materials with the corrosion resistance of non-metallic materials to produce high-performance, high-parameter polyethylene composite pipes.

[0004] High-performance, high-parameter polyethylene composite pipes are usually used in key areas of the national economy such as energy, chemical industry, and marine resource transportation. The conveying media are often characterized by high pressure, strong corrosiveness, flammability, explosiveness, and the presence of wear particles. High-performance, high-parameter polyethylene composite pipes used in these harsh working conditions have high energy storage density and are highly dangerous. Once an accident occurs, not only will the harm caused be great.

[0005] The weakest link in a high-performance, high-parameter polyethylene composite pipe system is its joints, so the connection technology of high-parameter polyethylene composite pipes is the key to their successful application. Currently, the quality control of high-parameter polyethylene composite pipe welded joints mainly relies on standardized welding operations, but various factors make defects inevitable during the welding process.

[0006] Ultrasonic testing, as a non-destructive, internally detectable testing technology, has gradually become an important testing method for high-parameter polyethylene composite pipe joints. Traditional ultrasonic testing of high-parameter polyethylene composite pipe joints is mostly manual, labor-intensive, and the test results are greatly affected by human factors. At the same time, because the specifications and dimensions of the high-parameter polyethylene composite pipe electric fusion sleeve are very different from those of the high-parameter polyethylene composite pipe pipeline, special extended and thickened electric fusion sleeves are usually used, and the resistance wire wire width is very large. If scanning manual testing is used, it is time-consuming and cannot obtain quality information of the entire fusion surface. With the continuous advancement of artificial intelligence technology, the requirements for defect identification of high-parameter polyethylene composite pipe joints have also increased. However, existing defect detection and identification rely on expert experience. Therefore, it is very important to seek a method for automatically detecting and automatically identifying defects in high-parameter polyethylene composite pipe joints and develop an efficient and stable intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electric fusion joints. Summary of the Invention

[0007] The main purpose of the present invention is to overcome the deficiencies in the prior art and to provide an intelligent ultrasonic detection system and method for high-parameter polyethylene composite pipe electric fusion joints.

[0008] The technical solution adopted by the present invention to achieve its technical purpose is: an intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electric fusion joints, including an ultrasonic automatic detection device and a ferromagnetic clamp guide rail, wherein the ferromagnetic clamp guide rail is sleeved on the high-parameter polyethylene composite pipe;

[0009] The ultrasonic automatic detection device includes a fixed guide wheel device, a detection trolley, a vehicle body mainboard, a lateral moving device and a probe device;

[0010] The fixed guide wheel device is fixedly mounted on both ends of the vehicle body mainboard, and is rollingly connected to the side of the ferromagnetic clamp guide rail;

[0011] The inspection trolley is fixedly mounted below the vehicle body mainboard and is rollingly connected to the upper surface of the ferromagnetic clamp guide rail;

[0012] The lateral movement device is fixedly mounted above the vehicle body mainboard, and drives the probe device to move laterally;

[0013] The probe device is set in the direction of the high-parameter polyethylene composite pipe, and the probe device is driven by the lateral moving device to align with the electric fusion joint on the high-parameter polyethylene composite pipe. Since the fixed guide wheel device is rollingly connected to the side of the ferromagnetic clamp guide rail, it is convenient for the detection trolley to be connected to the upper surface of the ferromagnetic clamp guide rail, and it is convenient for the detection trolley to move along the upper surface of the ferromagnetic clamp guide rail. Then, by driving the detection trolley to perform circular motion on the ferromagnetic clamp guide rail, it drives the probe device to scan the electric fusion joint on the high-parameter polyethylene composite pipe in a C-shaped path.

[0014] Preferably, the ferromagnetic clamp guide rails are respectively fitted on both ends of the electric fusion joint sleeve on the high-parameter polyethylene composite pipe;

[0015] The ferromagnetic clamp guide rail includes an upper clamp, a lower clamp, a lock handle, a bayonet and a lock sleeve;

[0016] The connection between one side of the upper clamp and the lower clamp is connected by a hinge, and the upper clamp and the lower clamp are hingedly connected at one side by the hinge, and the other ends of the upper clamp and the lower clamp are respectively connected to a lock card and a locking device;

[0017] The locking device includes a lock sleeve, a lock handle, a rotating shaft and a lock seat;

[0018] The lock handle is hinged on the lock seat, the rotating shaft is connected to the interior of the lock handle, the lock sleeve is threadedly connected to both ends of the rotating shaft, and the lock sleeve is locked on the bayonet of the lock card by rotating the lock handle.

[0019] Preferably, the detection trolley includes a driving motor, a driving bevel gear, a driven bevel gear and a driving wheel;

[0020] The driving motor is fixedly mounted on the lower surface of the vehicle body mainboard, and a driving bevel gear is fixedly mounted on its output shaft. The driving motor drives the driven bevel gear meshing with the driven bevel gear to rotate, thereby driving the driving wheel located on the same axis as the driven bevel gear to rotate. The driving wheel is in close contact and rolling connection with the upper surface of the ferromagnetic clamp guide rail.

[0021] The driving wheel is also electrically connected to an encoder for recording position information during the scanning process;

[0022] The fixed guide wheel device is composed of an upper guide wheel, a lower guide wheel, a lateral guide wheel, a first bottom plate and a second bottom plate;

[0023] The upper guide wheel, the lower guide wheel, and the side guide wheel are fixedly mounted on the first bottom plate and the second bottom plate, respectively. The upper guide wheel, the lower guide wheel, and the side guide wheel are clamped on the edge portion of the side of the ferromagnetic clamp guide rail, and at the same time maintain rolling connection with the ferromagnetic clamp guide rail;

[0024] An adjustable guide wheel device is provided between one set of the fixed guide wheel devices and the vehicle body mainboard, and the adjustable guide wheel device includes a movable shaft and a handle;

[0025] One end of the movable shaft is fixedly connected to the second bottom plate, and the other end is hinged to a handle, which is supported on the lower right side of the main board of the vehicle body.

[0026] By sleeved the movable shaft on the lower right side of the vehicle body main board, and then rotating the handle to push the movable shaft to move, one set of the fixed guide wheel devices is pushed, so that the two sets of fixed guide wheel devices are fastened to the ferromagnetic clamp guide rail.

[0027] Before installing the ultrasonic automatic detection device on the ferromagnetic clamp guide rail, the adjustable guide wheel device is in the open state. First, the upper guide wheel, lower guide wheel and side guide wheel in the fixed guide wheel device on the left are engaged with the ferromagnetic clamp guide rail, and then the fixed guide wheel device on the right is pushed by the handle to install the fixed guide wheel device on the ferromagnetic clamp guide rail, so that it moves along the track of the ferromagnetic clamp guide rail.

[0028] Preferably, the lateral movement device is composed of a connecting plate, a reducer, a guide column, a lead screw, a flange nut, a support block and a small motor;

[0029] One end of the two guide pillars is fixedly mounted on the connecting plate, and the other end is fixedly mounted on the support block. One end of the lead screw passes through the connecting plate and is fixedly mounted on the reducer, and the other end is rotatably mounted on the support block. The reducer is fixedly mounted on the vehicle body mainboard close to the connecting plate and is driven by the small motor.

[0030] The flange nut cooperates with the guide column and the lead screw, and the lead screw is driven to rotate by the cooperation of a small motor and a reducer, so that the flange nut moves laterally along the guide column and the lead screw.

[0031] Preferably, the probe device comprises a spring, an ultrasonic phased array probe, a wedge and a probe rubber sleeve;

[0032] The flange nut passes through the vehicle body mainboard and is fixedly connected to the spring. A sliding groove is provided inside the vehicle body mainboard for the flange nut to move laterally. The wedge is fixedly mounted below the spring, and the ultrasonic phased array probe is fixedly mounted on the wedge. A spring with a suitable elastic coefficient is selected according to the preload force requirements to ensure flexible contact between the wedge and the electric fusion joint and to achieve dynamic compression during movement.

[0033] The probe rubber sleeve is fixedly mounted on the end of the ultrasonic phased array probe to protect the ultrasonic phased array probe;

[0034] The ultrasonic phased array probe is electrically connected to an ultrasonic phased array instrument, and is electrically connected to a control system through the ultrasonic phased array instrument;

[0035] The wedge is configured as a colloidal wedge, and is coupled to the electric fusion joint through the colloidal wedge. Based on the acoustic properties of the high-parameter polyethylene composite pipe material to be inspected and the surface texture of the electric fusion sleeve, the wedge adopts a specially formulated colloidal wedge sound conductor. Currently, the colloidal wedge is initially prepared by mixing glycerin + water + coagulant to form a colloidal coagulant, so that its acoustic impedance matches that of the material to be inspected, and its sound speed is slightly lower than that of polyethylene, so that the interface sound transmission loss is minimized during contact method detection, and the sound speed difference can be eliminated through specific delay compensation.

[0036] The specific configuration method of the colloidal wedge is as follows: glycerol and deionized water are mixed in a ratio of 1:2, and an ultrasonic vibration emulsification device is used for mixing to form a uniform binary mixed emulsion; the ultrasonic vibration emulsification device is kept running, and an appropriate amount of nanoparticles such as water glass and silicon dioxide are added to the emulsion to increase the sound velocity, and phenoxyethanol is added as a preservative; the ultrasonic vibration emulsification device continues to run, and the emulsion is heated to 95°C, and polyvinyl alcohol with a high degree of polymerization such as PVA-2699 is slowly added for mixing, and the mixture is continuously vibrated at 95°C for 1 hour until the polyvinyl alcohol is completely dissolved; the mixed solution is poured into a wedge mold and placed in a vacuum degasser to remove bubbles; the mixed solution is cooled to room temperature to form a gelled solution, and the solution is gradually dried and demolded, and the surface is trimmed.

[0037] Alternatively, an ultrasonic coupling system is formed by the wedge and a coupling agent replenishing device to form a coupling with the electrofusion joint, wherein the coupling agent replenishing device includes a coupling agent replenishing port, a connecting hose, a probe rubber sleeve and an inflator;

[0038] The inflation cylinder is connected to a connecting hose. The connecting hose has a certain length and can be freely bent during the detection process. The connecting hose is connected to a coupling agent replenishing port, and the coupling agent replenishing port is connected to the interior of the wedge. A water hole is opened inside the wedge, and a water distribution groove is formed on the bottom surface of the wedge.

[0039] By pushing the inflator, the coupling agent inside is transported to the inside of the wedge through the connecting hose and the coupling agent replenishing port. The coupling agent is water, and then the water flow is evenly dispersed inside the wedge through the water hole and the water distribution groove, thereby creating a coupling water layer between the wedge and the wall of the electric fusion joint, ensuring air gap-free coupling while reducing friction and minimizing wedge wear.

[0040] The present invention also provides an intelligent ultrasonic detection method for high-parameter polyethylene composite pipe electrofusion joints, which uses the intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electrofusion joints, including a focusing method, specifically the following steps:

[0041] The ultrasonic phased array probe is scanned by a combination of line scanning and fan scanning, so that the sound field covers the resistance wire area below the ultrasonic phased array probe;

[0042] During line scanning, the ultrasonic phased array probe achieves line scanning by controlling the time delay between excitation and reception of each array element, and the sound field covers the area below the middle of the probe;

[0043] The delay time of each element in each excitation aperture depends on the focus position , the center position of the excitation array element , and the surface refraction point of the electrofusion joint Perform calculations;

[0044] ;

[0045] in, is the speed of sound of the colloidal wedge, is the sound velocity of the polyethylene material of the electrofusion joint;

[0046] In the supplementary sector scan, the ultrasonic phased array probe realizes sector scan on both sides by controlling the excitation and reception delay time of the array elements on both sides respectively, and the sound field covers the areas on both sides of the probe;

[0047] The sector scan adopts a deep focus mode, and the focus depth is consistent with the above-mentioned line scan. The scanning interval angle is set between 1 and 3 degrees.

[0048] The calculation rules for the delay time of each array element are consistent with those of the line scan, and are calculated based on the focus position, the center position of the excitation array element, and the surface refraction point position of the electrofusion joint.

[0049] Preferably, the method for calculating the position of the surface refraction point of the electrofusion joint is specifically as follows:

[0050] The focus position, the center position of the excitation array element, and the surface refraction point position of the electrofusion joint conform to Snell's law;

[0051] ;

[0052] Furthermore, since the refraction point I is on the surface of the electrofusion joint, the x-axis coordinate of the surface refraction point I of the electrofusion joint is and the z-axis coordinate It can be obtained by linear difference calculation of adjacent EF joint surface positions;

[0053] ;

[0054] in, and The surface positions of adjacent EF joints.

[0055] Preferably, the method for testing the surface position of the electric fusion joint is specifically as follows:

[0056] The surface position of the electric fusion joint is obtained by performing surface detection by the ultrasonic phased array probe; the ultrasonic phased array probe is moved to a certain axial detection position, and the ultrasonic phased array probe is fixed in the axial direction to perform surface detection; the ultrasonic phased array probe is used to perform electronic line scanning with an aperture of 1 (array element) and a step of 1 (array element), and each array element sequentially transmits and receives sound waves, and the time difference between the first echo and the second echo is collected. , so as to obtain the distance between the center of each array element and the surface of the electric fusion joint directly below .

[0057] Preferably, a three-dimensional reconstruction algorithm is also included, specifically including the following steps:

[0058] This is achieved by converting the coordinates of the detection data on the ultrasound image into the coordinates on the electrofusion joint;

[0059] The coordinate system {A} of the ultrasound image is taken as the origin O of the image coordinate system {A}, the array arrangement direction is taken as the x-axis of the image coordinate system {A}, and the depth direction is taken as the z-axis of the image coordinate system {A}. The position of a point P in {A} after imaging can be expressed as ;

[0060] The coordinate system {B} of the electrofusion joint is defined as the origin O' of the coordinate system {B}, the center of the end face of the electrofusion joint is defined as the x-axis of the coordinate system {B}, and the cross section of the plastic liner is defined as the yz plane;

[0061] The position of point P in the coordinate system {B} of the ultrasound image collected at the nth step and the mth rotation is ;

[0062] Based on the principle of full coverage of the welding surface and 10% repetition of the coverage area, the axial step distance of the ultrasonic image is δ, and the circumferential rotation step angle is γ. In this embodiment, counterclockwise rotation is adopted;

[0063] Translation vector represents the position of the origin O of the ultrasound image coordinate system {A} in the electrofusion joint coordinate system {B}, The position is calculated by the encoder, r is the radius of the outer surface of the electric fusion joint; the coordinate transformation matrix R is expressed as:

[0064] .

[0065] Preferably, a defect identification method is also included, specifically including the following steps:

[0066] Region segmentation: Use the Sobel operator to perform edge detection on all ultrasonic testing images, remove the near-field area and the internal and external cold welding areas, and obtain the welding area of the image to determine welding defects;

[0067] On all ultrasound images, along the negative infinity direction of the image coordinate system {A}z axis, the first boundary is found as the near-field segmentation line to segment the near-field region with strong clutter signals. On the ultrasound images on both sides of the electrofusion joint, along the image coordinate system {A}x axis, the boundary of the outer cold weld zone is found and segmented. On the ultrasound image in the middle of the electrofusion joint, along the image coordinate system {A}x axis, the boundary of the inner cold weld zone is found and segmented.

[0068] Signal feature extraction: In the weld area, the Sobel operator extracts strong edges of signal features such as resistance wires, holes, and fusion surfaces, and calculates the center of gravity, area, Hu moment, and Fourier descriptor of each individual contour. Above these strong edges, the Canny operator extracts weak edges of feature line signal features, and calculates the center of gravity, length, Hu moment, and Fourier descriptor of these weak edges.

[0069] Feature classification: Support vector machine (SVM) is used to classify signal features;

[0070] Create an ultrasonic signal dataset containing features and labels and train a support vector machine. Use the trained model to classify edge signals and obtain recognition results for resistance wires, holes, fusion surfaces, and feature lines.

[0071] Defect identification: identification of holes, fusion surface defects, resistance wire dislocation, and cold welding defects;

[0072] Determine whether there are holes or fusion surface signal categories in the image. If so, identify them as hole defects or fusion surface defects. Calculate the center of gravity position spacing of the resistance wire signals in the image, count the horizontal spacing, and calculate the horizontal spacing difference. If the horizontal spacing difference is greater than the standard, identify it as a horizontal misalignment defect of the resistance wire. Count the vertical spacing. If the vertical spacing is greater than the standard, identify it as a vertical misalignment of the resistance wire. Calculate the vertical distance between the characteristic line and each point of the resistance wire, count the average vertical distance. If the vertical distance is less than the standard, identify it as a cold welding defect.

[0073] Compared with the existing technology, the beneficial effects of the present invention are: the intelligent ultrasonic detection system and method for high-parameter polyethylene composite pipe electric fusion joints uses an ultrasonic phased array probe to scan in a supplementary manner of line scanning and fan scanning, and mechanical scanning in the axial and circumferential directions is combined with electronic scanning. The system records position information and ultrasonic information, which can be processed to form a real-time scanning image. A special C-scan technology is used to move more smoothly to achieve three-dimensional imaging of defects, so that the probe position and the position of the defect in the joint form a one-to-one correspondence, thereby realizing projection scanning, more accurate defect positioning, and improving detection accuracy.

[0074] In addition, based on the principle of ultrasonic detection pattern recognition, a correspondence between defect types and ultrasonic maps, defect geometric parameters and ultrasonic characteristic parameters was established. Automatic identification of defects was achieved through feature extraction, feature optimization and type recognition. An automatic defect identification system for ultrasonic detection of pipeline joints was developed, which achieved accurate identification of defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0076] Figure 1 Schematic diagram of the intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electric fusion joints.

[0077] Figure 2 for Figure 1 A magnified view of part of the structure.

[0078] Figure 3 for Figure 1 Schematic diagram of the top view structure.

[0079] Figure 4 This is a side view structural diagram of a ferromagnetic clamp guide rail connected to a high-parameter polyethylene composite pipe.

[0080] Figure 5 It is a side view structural diagram of the fixed guide wheel device.

[0081] Figure 6 It is a structural schematic diagram of the adjustable guide wheel device.

[0082] Figure 7 Schematic diagram of the probe device.

[0083] Figure 8 Schematic diagram of line-scan sound field coverage for phased array ultrasonic testing.

[0084] Figure 9 Schematic diagram of array element refraction.

[0085] Figure 10 Schematic diagram of the fan-scanning acoustic field coverage of phased array ultrasonic testing.

[0086] Figure 11 Schematic diagram of the calculation process of surface refraction points.

[0087] Figure 12 Schematic diagram of surface inspection of electric fusion joints.

[0088] Figure 13 Schematic diagram of three-dimensional reconstruction of electrofusion joint detection results.

[0089] Figure 14 Schematic diagram of the overlapping axial regions of the three-dimensional reconstruction of the electrofusion joint inspection results.

[0090] Figure 15 This is the 3D reconstructed side view of the electric fusion joint inspection results.

[0091] Figure 16 Schematic diagram of welding area segmentation.

[0092] Among them: 1. Fixed guide wheel device; 2. Reducer; 3. Connecting plate; 4. Small motor; 5. Inspection trolley; 6. Ferromagnetic clamp guide rail; 7. Car body main board; 8. Flange nut; 9. Probe device; 10. Support block; 11. Adjustable guide wheel device; 12. Handle; 13. Ultrasonic phased array instrument; 14. Control system; 15. Connecting hose; 16. Encoder; 17. Electrofusion joint sleeve; 18. Electrofusion joint; 19. High parameter polyethylene composite Tube; 20. Driving wheel; 21. Driven bevel gear; 22. Driving bevel gear; 23. Driving motor; 24. Guide column; 25. Lead screw; 26. Upper clamp; 27. Hinge; 28. Lower clamp; 29. Locking clamp; 30. Bayonet; 31. Locking sleeve; 32. Locking handle; 33. Rotating shaft; 34. Locking device; 35. Lateral guide wheel; 36. Upper guide wheel; 37. Lower guide wheel; 38. First base plate; 39. Second base plate; 40. Moving shaft; 41. Spring; 42. Ultrasonic phased array probe; 43. Couplant refill port; 44. Wedge; 45. Probe rubber cover; 46. Inflator. DETAILED DESCRIPTION

[0093] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or location relationships based on the positions or location relationships shown in the accompanying drawings, or the positions or location relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0094] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0095] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. However, it should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the present invention.

[0096] Example 1:

[0097] See also Figure 1-Figure 7 An intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electric fusion joints includes an ultrasonic automatic detection device and a ferromagnetic clamp guide rail 6, which is sleeved on the high-parameter polyethylene composite pipe 19; the ultrasonic automatic detection device includes a fixed guide wheel device 1, a detection trolley 5, a vehicle body main board 7, a lateral movement device and a probe device 9; the fixed guide wheel device 1 is fixedly mounted on both ends of the vehicle body main board 7 and is rollingly connected to the side of the ferromagnetic clamp guide rail 6; the detection trolley 5 is fixedly mounted below the vehicle body main board 7 and is rollingly connected to the upper surface of the ferromagnetic clamp guide rail 6; the lateral movement device is fixedly mounted above the vehicle body main board 7 and drives the probe device 9 to move laterally;

[0098] The probe device 9 is set in the direction of the high-parameter polyethylene composite pipe 19, and the probe device 9 is driven by the lateral moving device to align the position with the electric fusion joint 18 on the high-parameter polyethylene composite pipe 19. Since the fixed guide wheel device 1 is rollingly connected to the side of the ferromagnetic clamp guide rail 6, it is convenient for the detection trolley 5 to be connected to the upper surface of the ferromagnetic clamp guide rail 6, and it is convenient for the detection trolley 5 to move along the upper surface of the ferromagnetic clamp guide rail 6. Then, by driving the detection trolley 5 to make a circular motion on the ferromagnetic clamp guide rail 6, it drives the probe device 9 to scan the electric fusion joint 18 on the high-parameter polyethylene composite pipe 19 in a C-shaped path.

[0099] Furthermore, in this embodiment, the ferromagnetic clamp guide rail 6 is respectively fitted onto the two ends of the electric fusion joint sleeve 17 on the high-parameter polyethylene composite pipe 19; the ferromagnetic clamp guide rail 6 includes an upper clamp 26, a lower clamp 28, a locking handle 32, a bayonet 30, and a locking sleeve 31; the connection between the upper clamp 26 and the lower clamp 28 on one side is connected by a hinge 27, and the upper clamp 26 and the lower clamp 28 are hingedly connected on one side by the hinge 27, and the other ends of the upper clamp 26 and the lower clamp 28 are respectively connected to a locking card 29 and a locking device 34;

[0100] The locking device 34 includes a lock sleeve 31, a lock handle 32, a rotating shaft 33 and a lock seat; the lock handle 32 is hinged on the lock seat, the rotating shaft 33 passes through the interior of the lock handle 32, and the lock sleeve 31 is threadedly connected to both ends of the rotating shaft 33. By rotating the lock handle 32, the lock sleeve 31 is locked on the bayonet 30 of the lock card 29.

[0101] Furthermore, in this embodiment, the inspection trolley 5 includes a drive motor 23, a driving bevel gear 22, a driven bevel gear 21, and a drive wheel 20; the drive motor 23 is fixedly mounted on the lower surface of the vehicle body mainboard 7, and the driving bevel gear 22 is fixedly mounted on its output shaft. The drive motor 23 drives the driven bevel gear 21 meshing with the driven bevel gear 21 to rotate, thereby driving the drive wheel 20 located on the same axis as the driven bevel gear 21 to rotate. The drive wheel 20 is in close contact and rolling connection with the upper surface of the ferromagnetic clamp guide rail 6; the drive wheel 20 is also electrically connected to the encoder 16 for recording position information during the scanning process;

[0102] Furthermore, in this embodiment, the fixed guide wheel device 1 is composed of an upper guide wheel 36, a lower guide wheel 37, a lateral guide wheel 35, a first base plate 38 and a second base plate 39; the upper guide wheel 36, the lower guide wheel 37 and the lateral guide wheel 35 are fixedly mounted on the first base plate 38 and the second base plate 39 respectively, and the upper guide wheel 36, the lower guide wheel 37 and the lateral guide wheel 35 are clamped on the edge portion of the side of the ferromagnetic clamp guide rail 6, and at the same time maintain a rolling connection with the ferromagnetic clamp guide rail 6; an adjustable guide wheel device 11 is provided between one group of the fixed guide wheel devices 1 and the vehicle body main board 7, and the adjustable guide wheel device 11 includes a movable shaft 40 and a handle 12; one end of the movable shaft 40 is fixedly connected to the second base plate 39, and the other end is hinged to the handle 12, and the handle 12 is pressed against the lower right side of the vehicle body main board 7,

[0103] By fitting the movable shaft 40 on the lower right side of the vehicle body main board 7 and then pushing the movable shaft 40 by rotating the handle 12, one of the fixed guide wheel devices 1 is pushed, so that the two sets of fixed guide wheel devices 1 are fastened and mounted on the ferromagnetic clamp guide rail 6.

[0104] Before installing the ultrasonic automatic detection device on the ferromagnetic clamp guide rail 6, the adjustable guide wheel device 11 is in the open state. First, the upper guide wheel 36, the lower guide wheel 37 and the side guide wheel 35 in the fixed guide wheel device 1 on the left are engaged with the ferromagnetic clamp guide rail 6, and then the fixed guide wheel device 1 on the right is pushed by the handle 12, so that the fixed guide wheel device 1 is installed on the ferromagnetic clamp guide rail 6, so that it moves along the track of the ferromagnetic clamp guide rail 6.

[0105] Furthermore, in this embodiment, the lateral movement device is composed of a connecting plate 3, a reducer 2, a guide column 24, a screw 25, a flange nut 8, a support block 10 and a small motor 4; one end of the two guide columns 24 is fixedly mounted on the connecting plate 3, and the other end is fixedly mounted on the support block 10, one end of the screw 25 passes through the connecting plate 3 and is fixedly mounted on the reducer 2, and the other end is rotatably set on the support block 10, the reducer 2 is fixedly mounted on the vehicle body main board 7 close to the connecting plate 3, and is driven by the small motor 4; the flange nut 8 cooperates with the guide column 24 and the screw 25, and the screw 25 is driven to rotate by the cooperation of the small motor 4 and the reducer 2, so that the flange nut 8 moves laterally along the guide column 24 and the screw 25.

[0106] Furthermore, in this embodiment, the probe device 9 includes a spring 41, an ultrasonic phased array probe 42, a wedge 44 and a probe rubber sleeve 45; the flange nut 8 passes through the vehicle body main board 7 and is fixedly connected to the spring 41, and a sliding groove for the flange nut 8 to move laterally is opened inside the vehicle body main board 7, the wedge 44 is fixedly installed below the spring 41, and the ultrasonic phased array probe 42 is fixedly installed on the wedge 44; according to the preload force requirement, a spring 41 with a suitable elastic coefficient is selected to ensure flexible contact between the wedge 44 and the electric fusion joint 18, and dynamic compression can be achieved during movement; the probe rubber sleeve 45 is fixedly installed at the end of the ultrasonic phased array probe 42 to protect the ultrasonic phased array probe 42; the ultrasonic phased array probe 42 is electrically connected to the ultrasonic phased array instrument 13, and is electrically connected to the control system 14 through the ultrasonic phased array instrument 13.

[0107] Furthermore, in this embodiment, the wedge 44 is configured as a colloidal wedge, which is coupled to the electric fusion joint 18 through the colloidal wedge; according to the acoustic properties of the high-parameter polyethylene composite pipe material to be inspected and the surface texture of the electric fusion sleeve, a colloidal wedge of a specifically formulated colloidal wedge sound conductor can also be used. At present, the colloidal wedge is initially prepared into a colloidal coagulant by mixing glycerin + water + coagulant, so that its acoustic impedance matches that of the material to be inspected, and the sound speed is slightly lower than that of polyethylene, so that the interface sound transmission loss is minimized during contact detection, and the sound speed difference can be eliminated through specific delay compensation.

[0108] The specific configuration method of the colloidal wedge is as follows: glycerin and deionized water are mixed in a ratio of 1:2, and an ultrasonic vibration emulsification device is used to mix the mixture to form a uniform binary mixed emulsion; the ultrasonic vibration emulsification device is kept running, and an appropriate amount of nanoparticles such as water glass and silica are added to the emulsion to increase the sound velocity, and phenoxyethanol is added as a preservative; the ultrasonic vibration emulsification device continues to run, and the emulsion is heated to 95°C, and polyvinyl alcohol with a high degree of polymerization such as PVA-2699 is slowly added to mix, and the mixture is continuously vibrated at 95°C for 1 hour until the polyvinyl alcohol is completely dissolved; the mixed solution is poured into a wedge mold and placed in a vacuum degasser to remove bubbles; the mixed solution is cooled to room temperature to form a gelled solution, and the mixture is gradually dried and demolded, and the surface is trimmed.

[0109] Alternatively, an ultrasonic coupling system is formed by a wedge 44 and a couplant replenishing device to couple with the electrofusion joint 18. The couplant replenishing device includes a couplant replenishing port 43, a connecting hose 15, a probe rubber sleeve 45, and an inflator 46. The inflator 46 is connected to the connecting hose 15. The connecting hose 15 has a certain length and can be freely bent during the test. The connecting hose 15 is connected to the couplant replenishing port 43. The couplant replenishing port 43 is connected to the interior of the wedge 44. The wedge 44 has a water hole inside and a water distribution groove on the bottom surface of the wedge 44.

[0110] By pushing the inflator 46, the coupling agent inside is delivered to the interior of the wedge 44 through the connecting hose 15 and the coupling agent replenishing port 43. The coupling agent is water, and then the water flow is evenly dispersed inside the wedge 44 through the water holes and the water uniformity groove, thereby creating a coupling water layer between the wedge 44 and the wall of the electrofusion joint 18, ensuring air gap-free coupling while reducing friction and minimizing wear on the wedge.

[0111] It should also be pointed out that the embodiment of the present invention also adopts a special C-scan technology, which uses mechanical scanning combined with electronic scanning in the axial direction and mechanical scanning in the circumferential direction. The system records position information and ultrasonic information, and forms a real-time scanning image after processing. The automatic scanning system can realize projection scanning, so that the probe position and the position of the defect in the joint form a one-to-one correspondence.

[0112] The display and software systems are both implemented by a laptop computer. In the automatic ultrasonic flaw detection system, the system software acts as the nerve center. The control of the scanning device, the acquisition of ultrasonic signals, the storage and management of data, and the analysis and display of scanning results are all implemented by software. Therefore, the stability and reliability of software functions directly affect the accuracy and reliability of the detection results.

[0113] Example 2:

[0114] See also Figures 8-16Building on the above-mentioned embodiments, the present invention also provides an intelligent ultrasonic inspection method for high-parameter polyethylene composite pipe electrofusion joints. This method utilizes an intelligent ultrasonic inspection system for high-parameter polyethylene composite pipe electrofusion joints. Addressing the challenges of defect assessment in polyethylene and its steel-wire-reinforced composite pipe welded joints, which face complex causes, diverse types, and varying shapes and locations, the method conducts regularized processing of actual defects based on factors such as defect type, shape characteristics, and density, and proposes a defect characterization method. Based on the principle of ultrasonic detection pattern recognition, a correspondence is established between defect type and ultrasonic spectra, defect geometric parameters, and ultrasonic feature parameters. Automatic defect identification is achieved through feature extraction, feature optimization, and type recognition. Consequently, an automatic defect identification system for ultrasonic inspection of pipe joints has been developed, achieving accurate defect identification.

[0115] Automatic defect assessment: based on standards + automatic identification results;

[0116] Focusing mode: the phased array detection uses line scanning and fan scanning to supplement the scanning, so that the sound field covers the resistance wire area below the probe;

[0117] Figure 8-Figure 9 The phased array probe realizes line scanning by controlling the time delay of excitation and reception of each array element, and the sound field covers the area below the middle of the probe; the delay time of each array element in each excitation aperture is determined according to the focus position. , the center position of the excitation array element , and the surface refraction point of the electrofusion joint Perform calculations;

[0118] ;

[0119] in, is the speed of sound of the colloidal wedge, is the sound velocity of the polyethylene material of the electrofusion joint;

[0120] The focus position, the center position of the excitation array element, and the surface refraction point position of the electrofusion joint conform to Snell's law;

[0121] ;

[0122] Since the refraction point I is on the surface of the electrofusion joint, the x-axis coordinate of the surface refraction point I of the electrofusion joint is and the z-axis coordinate It can be obtained by linear difference calculation of adjacent EF joint surface positions;

[0123] ;

[0124] in, and The surface positions of adjacent EF joints.

[0125] Figure 10 In the phased array probe, the excitation and reception delay times of the array elements on both sides are controlled separately to achieve sector scanning, and the sound field covers the areas on both sides of the probe. The sector scanning adopts a depth focusing method, and the focusing depth is consistent with the above-mentioned line scanning. The scanning interval angle is set between 1 and 3 degrees. The delay time calculation rule of each array element is consistent with the line scanning, and is calculated based on the focus position, the position of the excitation array element, and the position of the surface refraction point of the electrofusion joint.

[0126] Surface refraction point calculation process:

[0127] The position of the surface refraction point of the electric fusion joint can be obtained by iterative calculation. The calculation process is as follows: Figure 11 As shown:

[0128] Step 1, x-axis coordinate of the surface refraction point of the initial electric fusion joint is the x-axis coordinate of the excitation array element;

[0129] Step 2: Calculate the z-axis coordinates of the surface refraction point by linearly interpolating the z-axis coordinates of the electrofusion joint surface corresponding to adjacent array elements. ;

[0130] Step 3: Set the z-axis coordinate of the surface refraction point Substitute into Snell's formula to find the x-axis coordinate of the surface refraction point of the electric fusion joint ;

[0131] Step 4: Determine the x-axis coordinate of the surface refraction point of the electric fusion joint and Is the difference between the two values less than the allowable error? If it is less than or equal to the error, output and As the surface refraction point coordinates of the fusion joint; otherwise, Substitution , repeat steps 2, 3, and 4 until the error tolerance is met.

[0132] The surface position of the electrofusion joint is obtained by performing surface detection with the phased array probe, such as Figure 12 The probe is moved to a certain axial detection position, and the probe is fixed in the axial direction for surface detection. The probe is used to perform electronic line scanning with an aperture of 1 (array element) and a step of 1 (array element). Each array element transmits and receives sound waves in turn, and the time difference between the first echo and the second echo is collected. , so as to obtain the distance between the center of each array element and the surface of the electric fusion joint directly below ;

[0133] Glycerol and deionized water are mixed in a ratio of 1:2 and mixed using an ultrasonic vibration emulsification device to form a uniform binary mixed emulsion; the frequency of the ultrasonic emulsification device is set to 20-40 kHz, the temperature is set to 25° C., and the emulsification time is adjusted according to the amount of the mixed emulsion; during the emulsification process, the mixing state of the glycerol and deionized water is observed to ensure uniform emulsification;

[0134] In the emulsion, an appropriate amount of nanoparticles such as water glass and silicon dioxide is added to increase the speed of sound, phenoxyethanol is added as a preservative, and an ultrasonic vibration emulsification device is used to continue mixing until it is uniform;

[0135] Heat the emulsion to 95°C, turn on the electric stirrer, and slowly add high-polymerization polyvinyl alcohol such as PVA-2699 to mix; maintain 95°C and continue stirring for 1 hour until the polyvinyl alcohol is completely dissolved; pour the mixture into the wedge mold and place it in a vacuum degasser to remove bubbles; cool the mixture to room temperature to form a gel solution, gradually dry and demould, and trim the surface.

[0136] The 3D reconstruction algorithm of the fan scanning of the polyethylene pipe electrofusion joint is realized by converting the coordinates of the detection data on the ultrasound image into the coordinates on the electrofusion joint, such as Figure 13 、 Figure 14 、 Figure 15 shown.

[0137] The coordinate system {A} of the ultrasound image is taken as the origin O of the image coordinate system {A}, the array arrangement direction is taken as the x-axis of the image coordinate system {A}, and the depth direction is taken as the z-axis of the image coordinate system {A}. The position of a point P in {A} after imaging can be expressed as ;

[0138] The coordinate system {B} of the electrofusion joint is taken as the origin O' of the coordinate system {B}, the central axis of the plastic liner is the x-axis of the coordinate system {B}, and the cross section of the plastic liner is the yz plane; the position of the midpoint P of the ultrasonic image collected at the nth step and the mth rotation in the coordinate system {B} is ;

[0139] Based on the principle of full coverage of the welding surface and 10% repetition of the coverage area, the axial step distance of the ultrasonic image is δ, and the circumferential rotation step angle is γ. In this embodiment, counterclockwise rotation is adopted;

[0140] Translation vector represents the position of the origin O of the ultrasound image coordinate system {A} in the electrofusion joint coordinate system {B}, The position is calculated by the encoder, r is the radius of the outer surface of the electric fusion joint; the coordinate transformation matrix R is expressed as:

[0141] ;

[0142] Defect identification of polyethylene pipe electrofusion joints mainly includes the following three parts: region segmentation, signal feature extraction, feature classification and identification;

[0143] 1) Region segmentation: The Sobel operator is used to perform edge detection on all ultrasonic inspection images, removing the near-field area and the internal and external cold weld areas to obtain the welding area of the image to determine welding defects;

[0144] Figure 16 On all ultrasound images, along the negative infinity direction of the image coordinate system {A}z axis, find the first boundary as the near-field segmentation line to segment the near-field area with strong clutter signals; on the ultrasound images on both sides of the electrofusion joint, along the image coordinate system {A}x axis, find the boundary of the outer cold weld zone and segment the outer cold weld zone; on the ultrasound image in the middle of the electrofusion joint, along the image coordinate system {A}x axis, find the boundary of the inner cold weld zone and segment the inner cold weld zone;

[0145] 2) Signal feature extraction: In the weld area, the Sobel operator extracts strong edges of signal features such as resistance wires, holes, and fusion surfaces, and calculates the center of gravity, area, Hu moment, and Fourier descriptor of each individual contour. Above these strong edges, the Canny operator extracts weak edges of feature line signal features, and calculates the center of gravity, length, Hu moment, and Fourier descriptor of these weak edges.

[0146] 3) Feature classification: Support vector machine (SVM) is used to classify signal features;

[0147] Create an ultrasonic signal dataset containing features and labels and train a support vector machine. Use the trained model to classify edge signals and obtain recognition results for resistance wires, holes, fusion surfaces, and feature lines.

[0148] 4) Defect identification: identification of holes, fusion surface defects, resistance wire dislocation, and cold welding defects;

[0149] Determine whether there are holes or fusion surface signal categories in the image. If so, identify them as hole defects or fusion surface defects. Calculate the center of gravity position spacing of the resistance wire signals in the image, count the horizontal spacing, and calculate the horizontal spacing difference. If the horizontal spacing difference is greater than the standard, identify it as a horizontal misalignment defect of the resistance wire. Count the vertical spacing. If the vertical spacing is greater than the standard, identify it as a vertical misalignment of the resistance wire. Calculate the vertical distance between the characteristic line and each point of the resistance wire, count the average vertical distance. If the vertical distance is less than the standard, identify it as a cold welding defect.

[0150] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present invention. Therefore, based on the innovative concept of the present invention, changes and modifications to the embodiments described herein, or equivalent structures, equivalent processes, or equivalent functional transformations made using the contents of the present invention's specification and drawings, and direct or indirect application of the above technical solutions to other related technical fields, are all included in the scope of protection of the present invention's patent.

Claims

1. An intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electrofusion joints, characterized by: It comprises an ultrasonic automatic detection device and a ferromagnetic clamp guide rail (6), wherein the ferromagnetic clamp guide rail (6) is sleeved on a high-parameter polyethylene composite pipe (19); The ultrasonic automatic detection device comprises a fixed guide wheel device (1), a detection trolley (5), a vehicle body mainboard (7), a lateral movement device and a probe device (9); The fixed guide wheel device (1) is fixedly mounted on both ends of the vehicle body mainboard (7), and is rollingly connected to the side of the ferromagnetic clamp guide rail (6); The inspection trolley (5) is fixedly mounted below the vehicle body mainboard (7) and is rollingly connected to the upper surface of the ferromagnetic clamp guide rail (6); The lateral movement device is fixedly mounted above the vehicle body mainboard (7), and drives the probe device (9) to move laterally; The probe device (9) includes an ultrasonic phased array probe (42), and the probe device (9) is set in the direction of the high-parameter polyethylene composite pipe (19). The probe device (9) is driven by the lateral moving device to align the position with the electric fusion joint (18) on the high-parameter polyethylene composite pipe (19), and then the detection trolley (5) is driven to perform circular motion on the ferromagnetic clamp guide rail (6), so that it drives the probe device (9) to scan the electric fusion joint (18) on the high-parameter polyethylene composite pipe (19) in a C-shaped path; The method for testing the surface position of the electric fusion joint (18) is specifically as follows: The surface position of the electric fusion joint (18) is obtained by performing surface detection using the ultrasonic phased array probe (42); The ultrasonic phased array probe (42) moves to a certain axial detection position, and the ultrasonic phased array probe (42) is fixed in the axial direction to perform surface detection; The ultrasonic phased array probe (42) is used to perform electronic line scanning with an aperture of 1 array element and a step of 1 array element. Each array element transmits and receives sound waves in sequence, and the time difference between the first echo and the second echo is collected to obtain the distance between the center of each array element and the surface of the electric fusion joint directly below.

2. The intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electric fusion joints according to claim 1 is characterized by: The ferromagnetic clamp guide rails (6) are respectively fitted on both ends of the electric fusion joint sleeve (17) on the high-parameter polyethylene composite pipe (19); The ferromagnetic clamp guide rail (6) comprises an upper clamp (26), a lower clamp (28), a lock handle (32), a bayonet (30) and a lock sleeve (31); The connection point on one side of the upper clamp (26) and the lower clamp (28) is connected by a hinge (27), and the other ends of the upper clamp (26) and the lower clamp (28) are respectively connected to a locking card (29) and a locking device (34); The locking device (34) includes a lock sleeve (31), a lock handle (32), a rotating shaft (33) and a lock seat; The lock handle (32) is hinged on the lock seat, the rotating shaft (33) is connected to the interior of the lock handle (32), the lock sleeve (31) is threadedly connected to both ends of the rotating shaft (33), and the lock sleeve (31) is locked to the bayonet (30) of the lock card (29) by rotating the lock handle (32).

3. The intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electric fusion joints according to claim 1 is characterized by: The detection trolley (5) includes a driving motor (23), a driving bevel gear (22), a driven bevel gear (21) and a driving wheel (20); The driving motor (23) is fixedly mounted on the lower surface of the vehicle body mainboard (7), and a driving bevel gear (22) is fixedly mounted on its output shaft. The driving motor (23) drives the driven bevel gear (21) meshed with the driven bevel gear (21) to rotate, thereby driving the driving wheel (20) located on the same axis as the driven bevel gear (21) to rotate. The driving wheel (20) is in contact with and rollingly connected to the upper surface of the ferromagnetic clamp guide rail (6); The driving wheel (20) is also electrically connected to an encoder (16) for recording position information during the scanning process; The fixed guide wheel device (1) is composed of an upper guide wheel (36), a lower guide wheel (37), a lateral guide wheel (35), a first bottom plate (38) and a second bottom plate (39); The upper guide wheel (36), the lower guide wheel (37), and the lateral guide wheel (35) are fixedly mounted on the first base plate (38) and the second base plate (39), respectively. The upper guide wheel (36), the lower guide wheel (37), and the lateral guide wheel (35) are clamped on the edge portion of the side of the ferromagnetic clamp guide rail (6), and are kept in rolling connection with the ferromagnetic clamp guide rail (6); An adjustable guide wheel device (11) is provided between one set of the fixed guide wheel devices (1) and the vehicle body mainboard (7), and the adjustable guide wheel device (11) includes a movable shaft (40) and a handle (12); One end of the movable shaft (40) is fixedly connected to the second bottom plate (39), and the other end is hinged to the handle (12), and the handle (12) is pressed against the lower right side of the vehicle body main plate (7). The movable shaft (40) is sleeved on the lower right side of the vehicle body main board (7), and the movable shaft (40) is pushed by rotating the handle (12) so as to push one of the fixed guide wheel devices (1), so that the two sets of fixed guide wheel devices (1) are fastened and mounted on the ferromagnetic clamp guide rail (6).

4. The intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electric fusion joints according to claim 1 is characterized by: The lateral movement device is composed of a connecting plate (3), a reducer (2), a guide column (24), a lead screw (25), a flange nut (8), a support block (10) and a small motor (4); One end of the two guide pillars (24) is fixedly mounted on the connecting plate (3), and the other end is fixedly mounted on the support block (10); one end of the lead screw (25) passes through the connecting plate (3) and is fixedly mounted on the reducer (2), and the other end is rotatably mounted on the support block (10); the reducer (2) is fixedly mounted on the vehicle body mainboard (7) close to the connecting plate (3) and is driven by the small motor (4); The flange nut (8) cooperates with the guide column (24) and the lead screw (25), and the lead screw (25) is driven to rotate by the cooperation of the small motor (4) and the reducer (2), so that the flange nut (8) moves laterally along the guide column (24) and the lead screw (25).

5. The intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electric fusion joints according to claim 4 is characterized by: The probe device (9) further includes a spring (41), a wedge (44) and a probe rubber sleeve (45); The flange nut (8) passes through the vehicle body main board (7) and is fixedly connected to the spring (41), and a sliding groove for the flange nut (8) to move laterally is provided inside the vehicle body main board (7), the wedge block (44) is fixedly mounted below the spring (41), and the ultrasonic phased array probe (42) is fixedly mounted on the wedge block (44); The probe rubber sleeve (45) is fixedly mounted on the end of the ultrasonic phased array probe (42) to protect the ultrasonic phased array probe (42); The ultrasonic phased array probe (42) is electrically connected to an ultrasonic phased array instrument (13), and is electrically connected to a control system (14) via the ultrasonic phased array instrument (13); The wedge (44) is configured as a colloidal wedge, and is coupled to the electrofusion joint (18) via the colloidal wedge; Alternatively, an ultrasonic coupling system is formed by the wedge (44) and a coupling agent supplement device to form a coupling with the electric fusion joint (18), wherein the coupling agent supplement device includes a coupling agent supplement port (43), a connecting hose (15), a probe rubber sleeve (45) and an inflator (46); The inflatable cylinder (46) is connected to the connecting hose (15), the connecting hose (15) is connected to the coupling agent replenishing port (43), the coupling agent replenishing port (43) is connected to the inside of the wedge block (44), a water hole is opened inside the wedge block (44), and a water uniformity groove is provided on the bottom surface of the wedge block (44); By pushing the inflating cylinder (46), the coupling agent inside it is transported to the inside of the wedge (44) through the connecting hose (15) and the coupling agent replenishing port (43). The coupling agent is water, and then the water flow is evenly dispersed inside the wedge (44) through the water hole and the water trough, thereby creating a coupling water layer between the wedge (44) and the wall of the electrofusion joint (18).

6. A method for intelligent ultrasonic detection of high-parameter polyethylene composite pipe electrofusion joints, which uses the intelligent ultrasonic detection system for high-parameter polyethylene composite pipe electrofusion joints according to any one of claims 1 to 5, characterized in that: Including focusing method, as follows: The ultrasonic phased array probe (42) is scanned in a complementary manner of line scanning and fan scanning, so that the sound field covers the resistance wire area below the ultrasonic phased array probe (42); During the line scanning process, the ultrasonic phased array probe (42) realizes line scanning by controlling the time delay of excitation and reception of each array element, and the sound field covers the area below the middle of the probe; In the supplementary sector scan, the ultrasonic phased array probe (42) realizes sector scan on both sides by respectively controlling the excitation and reception delay times of the array elements on both sides, and the sound field covers the areas on both sides of the probe; The sector scan adopts a deep focus mode, and the focus depth is consistent with the above-mentioned line scan. The scanning interval angle is set between 1 and 3 degrees. The calculation rule of the delay time of each array element is consistent with the line scan, and is calculated based on the focus position, the center position of the excitation array element, and the surface refraction point position of the electric fusion joint (18).

7. The intelligent ultrasonic detection method for high-parameter polyethylene composite pipe electric fusion joints according to claim 6 is characterized in that: The method for calculating the position of the surface refraction point of the electrofusion joint (18) is specifically as follows: The focus position, the center position of the excitation array element, and the surface refraction point position of the electrofusion joint (18) conform to Snell's law; Furthermore, since the refraction point I is on the surface of the electrofusion joint, the x-axis coordinate and the z-axis coordinate of the surface refraction point of the electrofusion joint can be obtained by performing linear difference calculation on adjacent positions on the surface of the electrofusion joint.

8. The intelligent ultrasonic detection method for high-parameter polyethylene composite pipe electric fusion joints according to claim 7 is characterized in that: It also includes a three-dimensional reconstruction algorithm, which includes the following steps: This is achieved by converting the coordinates of the detection data on the ultrasound image into the coordinates on the electrofusion joint (18); The coordinate system of the ultrasound image { A }, taking the center of the phased array probe as the image coordinate system { A }origin O , the array arrangement direction is used as the image coordinate system { A }of x Axis, depth in the opposite direction as the image coordinate system { A }of z axis; Coordinate system of electric fusion joint { B }, taking the center of the end face of the electrofusion joint as the coordinate system { B }origin O’ , the central axis of the plastic liner is the coordinate system { B }of x Shaft, plastic liner cylinder cross section is yz flat.

9. The intelligent ultrasonic detection method for high-parameter polyethylene composite pipe electric fusion joints according to claim 8, characterized in that: It also includes a defect identification method, which includes the following steps: Region segmentation: Use the Sobel operator to perform edge detection on all ultrasonic testing images, remove the near-field area and the internal and external cold welding areas, and obtain the welding area of the image to determine welding defects; Signal feature extraction: In the welding area, the Sobel operator extracts the strong edges of signal features such as resistance wires, holes, and fusion surfaces, and calculates the center of gravity, area, Hu moment, and Fourier descriptor of each individual contour; Above the strong edge, the canny operator is used to extract the weak edge of the characteristic line signal feature, and the center of gravity, length, Hu moment, and Fourier descriptor of the weak edge are calculated; Feature classification: Support vector machine (SVM) is used to classify signal features; Defect identification: Identify holes, fusion surface defects, resistance wire misalignment, and cold welding defects.

Images