Detection device for steel pipe production

Abstract

The invention discloses a detection device for steel pipe production, and relates to the technical field of steel pipe detection. The device specifically comprises a flaw detection part, wherein the flaw detection part comprises a fixed frame, an inner ring arranged in the fixed frame and one or more groups of detection heads which are arranged on the inner side of the inner ring in a circular array and are used for detecting a steel pipe; the detection head comprises a base, an ultrasonic transmitter, a laser transmitter, a CCD visual camera, a laser receiver and an ultrasonic receiver, the ultrasonic transmitter, the laser transmitter, the CCD visual camera, the laser receiver and the ultrasonic receiver are arranged on the side wall of the base, the ultrasonic transmitter is matched with the ultrasonic receiver, and the laser transmitter is matched with the laser receiver. By arranging the structures such as the ultrasonic transmitter, the laser transmitter, the CCD visual camera, the laser receiver and the ultrasonic receiver, three-dimensional data of vision, ultrasound and laser are analyzed, nondestructive testing is carried out on the steel pipe, and therefore the problems that in the prior art, detection blind areas exist, and the false alarm rate is high are solved.

Description

Technical Field

[0001] This invention relates to the field of steel pipe testing technology, and in particular to a testing device for steel pipe production. Background Technology

[0002] In the process of steel pipe manufacturing and use, non-destructive testing technology is indispensable to ensure its structural integrity and safety. However, in the existing technology, the non-destructive testing methods for steel pipes are relatively simple and have certain limitations.

[0003] For example, a search revealed a Chinese patent publication number CN205449892U, which discloses an ultrasonic flaw detection device for steel pipes. The device includes a feeding rack, an input roller conveyor, an operating table, an output roller conveyor, and a unloading rack connected in sequence. The operating table is equipped with a detection probe and an automatic marking pen. The feeding rack is installed at the entrance of the input roller conveyor, and the exit of the input roller conveyor is connected to one end of the operating table. The other end of the operating table is connected to the entrance of the output roller conveyor, and the exit of the output roller conveyor is connected to the unloading rack. Multiple sets of detection probes are connected above the operating table, and a movable automatic marking pen is also connected to the operating table.

[0004] The aforementioned patent has the following shortcomings: it uses ultrasonic waves as the sole means of flaw detection, which results in blind spots and a high false alarm rate.

[0005] Therefore, this invention proposes a testing device for steel pipe production. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a testing device for steel pipe production.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A testing device for steel pipe production includes a flaw detection unit. The inspection and flaw detection unit includes a fixed frame, an inner ring disposed inside the fixed frame, and one or more sets of inspection heads arranged in a circular array inside the inner ring for inspecting steel pipes. The detection head includes a base and an ultrasonic transmitter, a laser transmitter, a CCD vision camera, a laser receiver, and an ultrasonic receiver disposed on the side wall of the base. The ultrasonic transmitter and the ultrasonic receiver cooperate with each other, and the laser transmitter and the laser receiver cooperate with each other. The method for inspecting steel pipes using the ultrasonic transmitter, laser transmitter, CCD vision camera, laser receiver, and ultrasonic receiver is as follows: S1: When the steel pipe enters the inner side of the inner ring, the laser emitter emits a laser beam, which is reflected by the steel pipe and received by the laser receiver. The ultrasonic emitter emits ultrasonic waves, which are reflected by the steel pipe and received by the ultrasonic receiver. At the same time, the CCD vision camera collects image data of the steel pipe surface. S2: The image data, reflected laser data, and reflected ultrasonic data collected by the CCD vision camera, laser receiver, and ultrasonic receiver are summarized by the analysis module, and then the output is whether the steel pipe is damaged.

[0008] Preferably, in step S2, the analysis method of the analysis module includes: S21: Establish a standard database of defect features. First, prepare steel pipes with different defects for inspection. Extract their defect feature records through images, lasers and ultrasound to form a standard database containing three-dimensional feature data. S22: Data acquisition. In actual testing, the acquired image data, laser data, and ultrasonic data are first synchronized in time and jointly calibrated in coordinates. S23: Data preprocessing and feature extraction: After preprocessing the collected 3D data, feature extraction is performed on the data. S24: Feature-level fusion, which uses the DS evidence theory to fuse the extracted features; S25: Match the fused data with the standard database to output whether the steel pipe has defects and the type of defects.

[0009] Furthermore: mounting brackets are fixed to all four sides of the base, and a marker pen is installed inside the mounting brackets. A telescopic rod is fixed to the outer wall of the inner ring by bolts, and the telescopic end of the telescopic rod is fixed to the side wall of the base by bolts.

[0010] Based on the aforementioned scheme: the inner wall of the fixed frame is rotatably connected to at least three sets of circularly arranged limiting wheels via axles; the outer wall of the inner ring is fixed with a limiting track that cooperates with the rolling limiting of the limiting wheels; the inner wall of the fixed frame is fixed with a motor; and the output shaft of the motor is driven and cooperated with the outer wall of one of the axles via a synchronous transmission assembly.

[0011] A better option among the aforementioned solutions is that the rolling fit between the limiting wheel and the limiting track is a trapezoidal cross section, so that the limiting wheel can be axially positioned and radially positioned relative to the limiting track.

[0012] As a further aspect of the present invention: a set of conveying units is provided on both sides of the detection and flaw detection unit.

[0013] Meanwhile, the conveying unit includes a conveying frame supported on the ground by support legs and two sets of "V"-shaped symmetrical conveying rollers arranged inside the conveying frame and rolling in cooperation with the steel pipe. Each set of conveying rollers is arranged in a multiple linear array.

[0014] As a preferred embodiment of the present invention: a roller frame is rotatably connected to the outer side of the conveying roller, and a movable plate 1 is slidably connected to the inner walls of both sides of the conveying frame via a guide rod 1 and a movable plate 2 is slidably connected to the inner walls of both sides via a guide rod 2. One end of the roller frame is rotatably connected to the side wall of the movable plate 1, and a connecting rod is rotatably connected to the side wall of the other end of the roller frame. The other end of the connecting rod is rotatably connected to the side wall of the movable plate 2.

[0015] Meanwhile, hydraulic rod one and hydraulic rod two are fixed to the outer walls of both sides of the conveyor frame by bolts. The telescopic end of hydraulic rod one is fixed to the side wall of movable plate one by bolts, and the telescopic end of hydraulic rod two is fixed to the side wall of movable plate two by bolts.

[0016] As a preferred embodiment of the present invention, the side wall of one of the roller frames closest to the flaw detection section is fixed to the rotary drive component by bolts.

[0017] The beneficial effects of this invention are as follows: 1. This invention, by setting up structures such as an ultrasonic transmitter, a laser transmitter, a CCD vision camera, a laser receiver, and an ultrasonic receiver, analyzes three-dimensional data from vision, ultrasound, and laser to perform non-destructive testing on steel pipes, thereby solving the problems of blind spots and high false alarm rates in existing technologies.

[0018] 2. In this invention, by setting up a telescopic rod and a marker pen, when the detection head detects a defect in the steel pipe, the telescopic rod extends, driving the base and the marker pen to move, thereby enabling the marker pen to mark the defect around the steel pipe for easy subsequent processing.

[0019] 3. In this invention, when a single detection head is working, the motor starts and can drive the wheel axle to rotate through the synchronous transmission component, thereby driving the limit wheel to rotate. In turn, the friction between the limit wheel and the limit track drives the entire inner ring to rotate, increasing the comprehensiveness of the detection.

[0020] 4. This invention, on the one hand, enables automated inspection of steel pipes by setting up two sets of conveying units, which, together with the inspection and flaw detection units, can achieve automated inspection of steel pipes by setting up two sets of inclined conveying rollers and changing the inclination angle and spacing of the two sets of conveying rollers, thereby supporting and conveying steel pipes of different diameters, ensuring that the axial position of the steel pipes is determined, and increasing the accuracy of subsequent inspections. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a testing device for steel pipe production proposed in this invention; Figure 2 This is a schematic diagram of the flaw detection section of a testing device for steel pipe production proposed in this invention; Figure 3This is a schematic diagram of the detection head structure of a steel pipe production testing device proposed in this invention; Figure 4 This is a schematic diagram of the mounting frame and marker pen structure of a testing device for steel pipe production proposed in this invention; Figure 5 This is a schematic diagram of the fixing frame and inner ring mating structure of a testing device for steel pipe production proposed in this invention. Figure 6 This is a cross-sectional view of the limiting wheel and limiting track of a testing device for steel pipe production proposed in this invention. Figure 7 This is a schematic diagram of the conveying section structure of a testing device for steel pipe production proposed in this invention; Figure 8 This invention proposes a testing device for steel pipe production. Figure 7 Enlarged structural diagram of section A; Figure 9 This is a cross-sectional structural diagram of the conveying section of a testing device for steel pipe production proposed in this invention.

[0022] In the diagram: 1. Inspection and flaw detection unit; 2. Conveying unit; 3. Fixing frame; 4. Inspection head; 5. Inner ring; 6. Ultrasonic transmitter; 7. Laser transmitter; 8. CCD vision camera; 9. Laser receiver; 10. Ultrasonic receiver; 11. Base; 12. Telescopic rod; 13. Mounting frame; 14. Marker pen; 15. Axle; 16. Limiting wheel; 17. Limiting track; 18. Conveying roller; 19. Roller frame; 20. Conveying frame; 21. Support leg; 22. Movable plate one; 23. Guide rod one; 24. Guide rod two; 25. Movable plate two; 26. Connecting rod; 27. Hydraulic rod one; 28. Hydraulic rod two; 29. ​​Electric motor; 30. Synchronous transmission assembly. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] Example 1: A testing device for steel pipe production, such as Figures 1-9 As shown, it includes a flaw detection unit 1, which includes a fixing frame 3, an inner ring 5 disposed inside the fixing frame 3, and one or more sets of detection heads 4 arranged in a circular array inside the inner ring 5 for detecting steel pipes.

[0026] The detection head 4 includes a base 11 and an ultrasonic transmitter 6, a laser transmitter 7, a CCD vision camera 8, a laser receiver 9, and an ultrasonic receiver 10 disposed on the side wall of the base 11. The ultrasonic transmitter 6 and the ultrasonic receiver 10 cooperate with each other, and the laser transmitter 7 and the laser receiver 9 cooperate with each other.

[0027] The method for inspecting steel pipes using the ultrasonic transmitter 6, laser transmitter 7, CCD vision camera 8, laser receiver 9, and ultrasonic receiver 10 is as follows: S1: When the steel pipe enters the inner side of the inner ring 5, the laser emitter 7 emits a laser beam, which is reflected by the steel pipe and received by the laser receiver 9. The ultrasonic emitter 6 emits ultrasonic waves, which are reflected by the steel pipe and received by the ultrasonic receiver 10. At the same time, the CCD vision camera 8 collects image data of the steel pipe surface. S2: The image data, reflected laser data, and reflected ultrasonic data collected by the CCD vision camera 8, laser receiver 9, and ultrasonic receiver 10 are summarized by the analysis module, and then the output is whether the steel pipe is damaged.

[0028] In step S2, the analysis method of the analysis module includes: S21: Establish a standard database of defect features. First, prepare steel pipes with different defects for inspection. Extract their defect feature records through images, lasers and ultrasound to form a standard database containing three-dimensional feature data. In the laboratory, sample tubes containing various known natural defects (cracks, pores, inclusions, scratches, etc.) are scanned using this system.

[0029] For each type of defect, typical feature vectors are extracted from the data of each sensor, and their true values ​​are manually labeled. For example, cracks appear as "thin, dark lines" (texture features) in CCD images, as "continuous deep depressions" (geometric features) in 3D point clouds, and as "sharp reflected echoes" (signal features) in ultrasonic images.

[0030] The correspondence between these "multimodal features and defect types" is stored in a database as a priori knowledge base for subsequent decision-making based on DS evidence theory. S22: Data acquisition. In actual testing, the acquired image data, laser data, and ultrasonic data are first synchronized in time and jointly calibrated in coordinates. Synchronous data acquisition: The steel pipes pass through the inspection station at a constant speed.

[0031] Triggering: The encoder provides position signals in real time, and the system sends synchronous trigger signals to all sensors at preset intervals (such as 0.1mm) or time intervals.

[0032] collection: CCD Vision Camera 8: Acquires 2D grayscale / color images of the steel pipe surface.

[0033] Laser emitter 7 and laser receiver 9: emit laser lines and collect deformed light stripes to calculate the three-dimensional contour point cloud of the steel pipe surface in real time.

[0034] Ultrasonic transmitter 6 and ultrasonic receiver 10: emit ultrasonic beams according to preset focusing rules and scanning angles, receive A-scan signals, and synthesize B-scan or C-scan images of the steel pipe cross-section.

[0035] Time synchronization: All sensors are synchronously acquired through a unified hardware trigger signal (such as a pulse emitted by an encoder or PLC for every 0.1mm movement of the steel pipe), ensuring that the acquired data segments correspond to the same physical segment of the steel pipe.

[0036] Spatial coordinate unification: This is the mathematical foundation of multimodal fusion. A unified "world coordinate system" is calculated by scanning a specially designed joint calibration device (which is covered with feature points clearly identifiable in visual, 3D point cloud, and ultrasound images, such as pits, protrusions, or metal spheres of specific shapes). Using a coordinate transformation matrix, all sensor data is converted to this unified coordinate system. In this way, the pixel coordinates of a point in the visual image, its 3D coordinates in the point cloud, and its acoustic path distance in the ultrasound scan can be accurately correlated.

[0037] S23: Data preprocessing and feature extraction: After preprocessing the collected 3D data, feature extraction is performed on the data. Visual channel: The 2D image is filtered to remove noise and enhance contrast. Then, image processing algorithms (such as edge detection, blob analysis, and texture analysis) are used to extract the grayscale, texture, and shape features of suspicious areas.

[0038] 3D point cloud channel: This channel filters and denoises the point cloud data, then calculates the geometric features of local areas, such as height, depth, curvature, and flatness. For example, pits are represented as local point cloud depressions, and convexities as upward convexities.

[0039] Ultrasonic Channel: Performs noise reduction and gain compensation on ultrasonic A-scan signals or images, and extracts features such as echo amplitude, time of flight, signal spectrum, and defect indication length.

[0040] S24: Feature-level fusion, which uses the DS evidence theory to fuse the extracted features; S25: Match the fused data with the standard database to output whether the steel pipe has defects and the type of defects.

[0041] This device, by setting up an ultrasonic transmitter 6, a laser transmitter 7, a CCD vision camera 8, a laser receiver 9, and an ultrasonic receiver 10, analyzes three-dimensional data from vision, ultrasound, and laser to perform non-destructive testing on steel pipes, thereby solving the problems of blind spots and high false alarm rates in existing technologies.

[0042] Example 2: A testing device for steel pipe production, such as... Figures 1-9 As shown, in order to solve the problem of thirst, this embodiment makes the following improvements based on embodiment 1: the four sides of the base 11 are all fixed with mounting brackets 13, the inside of the mounting brackets 13 is provided with a marker pen 14, and the outer wall of the inner ring 5 is fixed with a telescopic rod 12 by bolts, and the telescopic end of the telescopic rod 12 is fixed to the side wall of the base 11 by bolts.

[0043] This device, by setting up a telescopic rod 12 and a marker pen 14, allows the telescopic rod 12 to extend when the detection head 4 detects a defect in the steel pipe, thereby moving the base 11 and the marker pen 14. This enables the marker pen 14 to mark the defect around the steel pipe for subsequent processing.

[0044] The inner wall of the fixed frame 3 is rotatably connected to at least three sets of circularly arranged limiting wheels 16 via axle 15. The outer wall of the inner ring 5 is fixed with a limiting track 17 that rolls and limits the limiting wheels 16. The inner wall of the fixed frame 3 is fixed with a motor 29. The output shaft of the motor 29 is driven and engaged with the outer wall of one of the axles 15 via a synchronous transmission assembly 30.

[0045] The rolling fit between the limiting wheel 16 and the limiting track 17 is a trapezoidal cross section, which allows the limiting wheel 16 to be positioned both axially and radially on the limiting track 17.

[0046] When a single detection head 4 is working, the motor 29 starts, which can drive the wheel axle 15 to rotate through the synchronous transmission component 30, thereby driving the limit wheel 16 to rotate. In turn, the friction between the limit wheel 16 and the limit track 17 drives the entire inner ring 5 to rotate, increasing the comprehensiveness of the detection.

[0047] Example 3: A testing device for steel pipe production, such as Figures 1-9 As shown, in order to solve the problem of thirst, this embodiment makes the following improvements based on embodiment 2: a set of conveying units 2 are respectively provided on both sides of the detection and flaw detection unit 1.

[0048] The conveying unit 2 includes a conveying frame 20 supported on the ground by support legs 21 and two sets of "V"-shaped symmetrical conveying rollers 18 arranged inside the conveying frame 20 and rolling in cooperation with the steel pipe. Each set of conveying rollers 18 is arranged in a multiple linear array.

[0049] The outer side of the conveying roller 18 is rotatably connected to a roller frame 19. The inner walls of both sides of the conveying frame 20 are slidably connected to a movable plate 22 via a guide rod 23 and a movable plate 25 via a guide rod 24. One end of the roller frame 19 is rotatably connected to the side wall of the movable plate 22, and the other end of the roller frame 19 is rotatably connected to a connecting rod 26. The other end of the connecting rod 26 is rotatably connected to the side wall of the movable plate 25.

[0050] Hydraulic rod 27 and hydraulic rod 28 are fixed to both outer walls of the conveyor frame 20 by bolts. The telescopic end of hydraulic rod 27 is fixed to the side wall of movable plate 22 by bolts, and the telescopic end of hydraulic rod 28 is fixed to the side wall of movable plate 25 by bolts.

[0051] The side wall of one of the roller frames 19 closest to the flaw detection unit 1 is fixed to the rotary drive unit by bolts. The rotary output end of the rotary drive unit is fixed to the side wall of the conveyor roller 18. The rotary drive unit can be a motor or a motor, etc.

[0052] In this embodiment, when in use, two sets of conveying rollers 18 arranged in a "V" shape can support the steel pipe from both sides. Then, when the rotating drive on the roller frame 19 closest to the flaw detection part 1 drives the conveying roller 18 to rotate, it can drive the steel pipe to move linearly through friction, thereby realizing the conveying of the steel pipe. Furthermore, when the tilt angle and / or distance of the "V" shape structure of the two sets of conveying rollers 18 change, the height of the supported steel pipe can be changed.

[0053] This device, on the one hand, enables automated inspection of steel pipes by setting up two sets of conveying units 2, which, together with the inspection and flaw detection unit 1, can achieve automated inspection of steel pipes. On the other hand, it enables the support and conveying of steel pipes of different diameters by using two sets of inclined conveying rollers 18, and by changing the inclination angle and spacing of the two sets of conveying rollers 18, thus ensuring the axial position of the steel pipes is determined and increasing the accuracy of subsequent inspections.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A testing device for steel pipe production, comprising a flaw detection unit (1), characterized in that, The detection and flaw detection unit (1) includes a fixed frame (3), an inner ring (5) disposed inside the fixed frame (3), and one or more sets of detection heads (4) arranged in a circular array inside the inner ring (5) for detecting steel pipes. The detection head (4) includes a base (11) and an ultrasonic transmitter (6), a laser transmitter (7), a CCD vision camera (8), a laser receiver (9) and an ultrasonic receiver (10) disposed on the side wall of the base (11). The ultrasonic transmitter (6) and the ultrasonic receiver (10) cooperate with each other, and the laser transmitter (7) and the laser receiver (9) cooperate with each other. The method for inspecting steel pipes using the ultrasonic transmitter (6), laser transmitter (7), CCD vision camera (8), laser receiver (9), and ultrasonic receiver (10) is as follows: S1: When the steel pipe enters the inner side of the inner ring (5), the laser emitter (7) emits a laser beam, which is reflected by the steel pipe and received by the laser receiver (9). The ultrasonic emitter (6) emits ultrasonic waves, which are reflected by the steel pipe and received by the ultrasonic receiver (10). At the same time, the CCD vision camera (8) collects image data of the steel pipe surface. S2: The image data, reflected laser data and reflected ultrasonic data collected by the CCD vision camera (8), laser receiver (9), and ultrasonic receiver (10) are summarized by the analysis module, and then the output is whether the steel pipe is damaged.

2. The testing device for steel pipe production according to claim 1, characterized in that, In step S2, the analysis method of the analysis module includes: S21: Establish a standard database of defect features. First, prepare steel pipes with different defects for inspection. Extract their defect feature records through images, lasers and ultrasound to form a standard database containing three-dimensional feature data. S22: Data acquisition. In actual testing, the acquired image data, laser data, and ultrasonic data are first synchronized in time and jointly calibrated in coordinates. S23: Data preprocessing and feature extraction: After preprocessing the collected 3D data, feature extraction is performed on the data. S24: Feature-level fusion, which uses the DS evidence theory to fuse the extracted features; S25: Match the fused data with the standard database to output whether the steel pipe has defects and the type of defects.

3. The testing device for steel pipe production according to claim 1, characterized in that, The base (11) is fixed with mounting brackets (13) on all four sides. A marker pen (14) is installed inside the mounting bracket (13). The outer wall of the inner ring (5) is fixed with a telescopic rod (12) by bolts. The telescopic end of the telescopic rod (12) is fixed to the side wall of the base (11) by bolts.

4. The testing device for steel pipe production according to claim 3, characterized in that, The inner wall of the fixed frame (3) is rotatably connected to at least three sets of circular arrayed limiting wheels (16) via axle (15). The outer wall of the inner ring (5) is fixed with a limiting track (17) that is in rolling limiting cooperation with the limiting wheels (16). The inner wall of the fixed frame (3) is fixed with a motor (29). The output shaft of the motor (29) is in transmission cooperation with the outer wall of one of the axles (15) via a synchronous transmission assembly (30).

5. The testing device for steel pipe production according to claim 4, characterized in that, The rolling fit between the limiting wheel (16) and the limiting track (17) is a trapezoidal cross section, which allows the limiting wheel (16) to be positioned axially and radially relative to the limiting track (17).

6. The testing device for steel pipe production according to claim 1, characterized in that, A set of conveying units (2) is provided on both sides of the detection and flaw detection unit (1).

7. The testing device for steel pipe production according to claim 6, characterized in that, The conveying unit (2) includes a conveying frame (20) supported on the ground by a support leg (21) and two sets of "V"-shaped symmetrical conveying rollers (18) arranged inside the conveying frame (20) and rolling with the steel pipe. Each set of conveying rollers (18) is arranged in multiple linear arrays.

8. The testing device for steel pipe production according to claim 7, characterized in that, The outer side of the conveying roller (18) is rotatably connected to a roller frame (19). The inner walls of both sides of the conveying frame (20) are slidably connected to a movable plate (22) via a guide rod (23) and a movable plate (25) via a guide rod (24). One end of the roller frame (19) is rotatably connected to the side wall of the movable plate (22), and the other end of the roller frame (19) is rotatably connected to a connecting rod (26). The other end of the connecting rod (26) is rotatably connected to the side wall of the movable plate (25).

9. A testing device for steel pipe production according to claim 8, characterized in that, The outer walls of both sides of the conveyor frame (20) are fixed with hydraulic rod one (27) and hydraulic rod two (28) by bolts. The telescopic end of hydraulic rod one (27) is fixed to the side wall of movable plate one (22) by bolts, and the telescopic end of hydraulic rod two (28) is fixed to the side wall of movable plate two (25) by bolts.

10. A testing device for steel pipe production according to claim 9, characterized in that, The side wall of one of the roller frames (19) closest to the flaw detection unit (1) is fixed to the rotary drive by bolts.

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