Intelligent visual flaw detection device for corrosion-resistant seamless steel pipe

Abstract

This invention discloses an intelligent visual flaw detection device for corrosion-resistant seamless steel pipes, relating to the field of visual flaw detection technology for pipeline inner walls. It includes an electrical control cabinet with a feeding module for carrying steel pipe workpieces mounted on its side. It also includes a visual flaw detection mechanism located inside the electrical control cabinet. The visual flaw detection mechanism includes a feed drive assembly comprising a carrying roller. When the steel pipe workpiece moves along the conveying direction, the carrying roller moves synchronously in a straight line in the opposite direction to the steel pipe workpiece. When the steel pipe workpiece is conveyed to its position, the carrying roller moves synchronously to its position, and the carrying roller is located on the central axis of the steel pipe workpiece. This achieves automatic switching between the horizontal attitude of the flaw detection instrument on the outward journey and the inclined attitude on the return journey. The entire attitude switching process is completed outside the steel pipe workpiece. Through the alternating switching of the two detection attitudes, complementary identification of defects under different illumination angles is achieved, significantly improving the detection rate of subtle hidden defects and avoiding missed detections.

Description

Technical Field

[0001] This invention relates to the field of visual flaw detection technology for pipeline inner walls, specifically to an intelligent visual flaw detection device for corrosion-resistant seamless steel pipes. Background Technology

[0002] Corrosion-resistant seamless steel pipes, as core pressure-bearing components for oil and gas transportation, nuclear power pipelines, pressure vessels, and high-end fluid equipment, possess characteristics such as uniform pipe wall, strong sealing, and excellent corrosion resistance and fatigue resistance. They are widely used in fields with extremely high requirements for pipe reliability, such as petrochemicals, energy equipment, municipal pipe networks, and precision machinery manufacturing. The quality of their inner wall directly affects the operational safety and service life of the system. Visual inspection of the inner wall of this type of steel pipe is a key process for the automated detection of cracks, pits, corrosion, coating defects, etc., through optical imaging and intelligent recognition technology. It is mostly used in factory quality inspection, in-service maintenance, and new material process verification. In high-safety applications such as high-end equipment matching and high-pressure fluid transportation, the accuracy of flaw detection and imaging stability directly determine the qualification of the pipe.

[0003] In the prior art, such as the patent with patent number CN208902626U and title "A Steel Pipe Inner Surface Inspection Equipment", the core is to fix the steel pipe with a positioning device and drive the inspection device to move along the axial direction of the steel pipe with the sliding part to realize the segmented inspection of the inner surface of the steel pipe.

[0004] Although this technology can scan and inspect the inner surface of steel pipes, it still has significant limitations and is difficult to adapt to visual inspection of corrosion-resistant seamless steel pipes: First, the detection mode is limited, making it difficult to achieve comprehensive defect detection: The equipment uses only a fixed detection probe at a single angle. When faced with the characteristics of strong specular reflection on the inner wall of corrosion-resistant seamless steel pipes, hidden microcracks, and diverse corrosion spots, it is difficult to meet the imaging needs of different types of defects. Specifically, the horizontal direct angle is prone to masking microcracks and shallow corrosion defects due to high-brightness blurring, and the lack of complementary detection from the tilted side angle makes it very easy to miss linear and point-like hidden defects. It cannot achieve comprehensive identification of planar defects and linear micro-defects, and the comprehensiveness and reliability of flaw detection cannot meet the inspection standards of high-end pipe materials.

[0005] Secondly, the feed structure lacks stability, which can easily cause detection deviations: The feed components of this detection equipment lack targeted counterweight optimization design. During the reciprocating movement of the long-stroke cantilever detection device, the cantilever end is prone to drooping due to its own weight, causing the detection probe to deviate from the axis of the steel pipe, resulting in problems such as eccentricity and shaking. This undermines the benchmark conditions for non-contact equidistant detection, causing unstable imaging distance and image distortion, which seriously affects the accuracy and consistency of defect identification and makes it difficult to meet the high-precision detection requirements of corrosion-resistant seamless steel pipes with large length-to-diameter ratios.

[0006] Furthermore, the compatibility between feeding and testing is limited, resulting in low testing efficiency: The feeding module of this equipment only adopts a conventional roller support structure and lacks a three-point collaborative limiting design for corrosion-resistant seamless steel pipes. It is not compatible with corrosion-resistant steel pipes of different specifications and wall thicknesses. During the conveying process, pipes are prone to deviation and shaking, which interferes with the flaw detection feeding action. Manual intervention is required to adjust the probe posture, making it impossible to achieve continuous and efficient batch testing and failing to meet the needs of automated and large-scale flaw detection in industrial scenarios.

[0007] It is evident that the aforementioned defects, when combined, not only significantly reduce the comprehensiveness of flaw detection and result in a high rate of missed micro-defects, but also disrupt the stability of coaxial feeding. This fundamentally reduces the efficiency and accuracy of visual flaw detection on the inner surface of steel pipes, making it difficult to achieve efficient, stable, and comprehensive flaw detection of the inner wall of steel pipes.

[0008] Therefore, this invention proposes an intelligent visual flaw detection device for corrosion-resistant seamless steel pipes to compensate for and improve the shortcomings of existing technologies.

[0009] In view of this, the present invention proposes an intelligent visual flaw detection device for corrosion-resistant seamless steel pipes to make up for and improve the shortcomings of the prior art. Summary of the Invention

[0010] To address the aforementioned technical problems, this invention provides an intelligent visual flaw detection device for corrosion-resistant seamless steel pipes, thereby resolving the technical issues raised in the background section.

[0011] To achieve the above objectives, the present invention provides the following technical solution: an intelligent visual flaw detection device for corrosion-resistant seamless steel pipes, used for flaw detection treatment of the inner surface of steel pipe workpieces, including an electrical control cabinet, the side of which is equipped with a feeding module for carrying the steel pipe workpieces, characterized in that... It also includes a visual flaw detection mechanism installed inside the electrical control cabinet; The visual flaw detection mechanism includes a feed drive assembly, which includes a carrying roller. When the steel pipe workpiece moves along the conveying direction, the carrying roller moves synchronously in a straight line in the opposite direction to the steel pipe workpiece. When the steel pipe workpiece is conveyed to the position, the carrying roller moves synchronously to the position and is located on the central axis of the steel pipe workpiece, providing a non-contact equidistant detection reference that moves linearly along the axis of the steel pipe workpiece for subsequent flaw detection. The visual flaw detection mechanism also includes a flaw detection switching component, which includes a flaw detection instrument mounted on the outside of a support roller. The flaw detection instrument can reciprocate linearly along the support roller. When the flaw detection instrument moves forward along the support roller toward the inside of the steel pipe workpiece, the flaw detection instrument is in a horizontal position to inspect the inner wall of the steel pipe workpiece. When the flaw detection instrument moves back along the support roller toward the electrical control cabinet, the flaw detection instrument switches to an inclined position to inspect the inner wall of the steel pipe workpiece at a lateral tilt angle.

[0012] Compared with the known prior art, the technical solution provided by this invention has at least one of the following beneficial effects: This intelligent visual flaw detection device for seamless steel pipes achieves smooth reciprocating sliding of the flaw detector along the carrying roller through the rolling engagement of the drive base and the limiting protrusion on the outer wall of the bearing roller, combined with the U-shaped groove structure of the drive base to avoid the rack plate. Simultaneously, the flaw detector is hinged to the mounting base via a limiting support shaft, and the magnetic attraction of the adsorption shaft and magnetic plate enables automatic switching between the horizontal forward posture and the tilted return posture of the flaw detector. The entire posture switching process is completed outside the steel pipe workpiece, effectively avoiding interference with the inner wall of the workpiece. By alternating between the two detection postures, complementary defect identification under different lighting angles is achieved, significantly improving the detection rate of subtle, hidden defects and preventing missed detections.

[0013] Furthermore, by configuring a drive gear, rack, and carrier roller in the feed drive assembly of the visual flaw detection mechanism, the rotational motion is converted into linear reciprocating motion of the carrier roller along the axis of the steel pipe workpiece through the meshing transmission of the drive gear and rack. Combined with the reverse synchronous movement design of the carrier roller and the steel pipe workpiece, the carrier roller moves synchronously to its central axis after the steel pipe workpiece is delivered to the position. This provides the flaw detection instrument with a non-contact equidistant detection benchmark that moves linearly along the axis of the steel pipe workpiece, effectively avoiding detection deviations caused by the offset of the carrier roller. At the same time, the gradient counterweight block group in the hollow groove inside the carrier roller forms a two-end opposed balance structure with the drive gear, which counteracts the drooping tendency of the cantilever end of the carrier roller caused by its own weight, ensuring that the carrier roller remains horizontal and coaxial throughout the entire process, further improving the accuracy and stability of flaw detection.

[0014] The three-point support and limiting structure, consisting of inclined roller shafts on both sides and a horizontal roller shaft at the bottom of the limiting roller group, combined with two feeding modes—axial linear conveying and lateral flipping positioning—achieves stable support and posture correction for corrosion-resistant seamless steel pipe workpieces of different specifications. This effectively prevents the steel pipe workpieces from shifting, shaking, or tipping during the conveying process, ensuring that the workpiece remains coaxial with the visual inspection mechanism after being conveyed to its position. This provides a solid positional reference for the subsequent reverse synchronous feeding of the carrying rollers and non-contact equidistant inspection, significantly improving the device's adaptability to steel pipe workpieces of different specifications. At the same time, it ensures the stability and orderliness of the feeding process and reduces detection errors caused by workpiece posture deviations. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the axial view of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the axial linear feeding planar structure of the steel pipe workpiece according to the present invention; Figure 3This is a schematic diagram of the lateral flipping feeding planar structure of the steel pipe workpiece of the present invention; Figure 4 This is a schematic diagram of the planar structure of the visual flaw detection mechanism of the present invention when it is not inserted into the steel pipe workpiece; Figure 5 This is a schematic diagram of the planar structure of the visual flaw detection mechanism of the present invention when it is inserted into a steel pipe workpiece. Figure 6 This is a schematic diagram of the axial view of the three-dimensional structure of the relevant components of the visual flaw detection mechanism of the present invention; Figure 7 This is a frontal planar structural diagram of the relevant components of the visual flaw detection mechanism of the present invention; Figure 8 This is a three-dimensional structural diagram showing the positional relationship of the counterweight block assembly of the present invention; Figure 9 This is a schematic diagram of the planar structure of the flaw detection instrument of the present invention during the horizontal flaw detection process; Figure 10 This is a three-dimensional structural diagram of the flaw detection instrument switching state of the present invention; Figure 11 This is a schematic diagram of the planar structure of the tilting flaw detection process of the flaw detection instrument of the present invention.

[0016] The numbers on the map are: 1. Electrical control cabinet; 11. Steel pipe workpiece; 2. Feeding module; 21. Support base; 22. Tray frame; 23. Limiting roller assembly; 3. Visual flaw detection mechanism; 31. Feed drive assembly; 311. Drive gear; 3101. Adjusting shaft; 312. Bearing roller; 313. Rack plate; 314. Hollow groove; 315. Counterweight block assembly; 316. Buffer flexible shaft; 317. Limiting protrusion; 32. Flaw detection switching assembly; 321. Drive base; 322. Mounting base; 323. Limiting support shaft; 324. Flaw detection instrument; 325. Adsorption shaft; 326. Protruding edge base plate; 327. Magnetic suction plate. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. It should be noted that the flaw detector 324 is a visual flaw detector for the inner wall of steel pipes in the prior art. It includes an image acquisition module, a light source module and a data processing module, which are used to acquire images of the inner wall of corrosion-resistant seamless steel pipes and identify surface defects. The specific structure and working principle of the above modules are all prior art, and will not be described in detail here.

[0018] Example 1: like Figures 1 to 6 As shown, an intelligent visual flaw detection device for corrosion-resistant seamless steel pipe is used to perform flaw detection on the inner surface of steel pipe workpiece 11. It includes an electrical control cabinet 1, and a feeding module 2 for carrying the steel pipe workpiece 11 is installed on the side of the electrical control cabinet 1. Further implementation includes a visual flaw detection mechanism 3 installed inside the electrical control cabinet 1.

[0019] The visual flaw detection mechanism 3 includes a feed drive assembly 31, which includes a carrying roller 312. When the steel pipe workpiece 11 moves along the conveying direction, the carrying roller 312 moves synchronously in a straight line in the opposite direction to the steel pipe workpiece 11. When the steel pipe workpiece 11 is conveyed to the position, the carrying roller 312 moves synchronously to the position and is located on the central axis of the steel pipe workpiece 11, providing a non-contact equidistant detection reference that moves linearly along the axis of the steel pipe workpiece 11 for subsequent flaw detection. The visual flaw detection mechanism 3 also includes a flaw detection switching component 32, which includes a flaw detection instrument 324. The flaw detection instrument 324 is mounted on the outside of the bearing roller 312 and can move back and forth linearly along the bearing roller 312. When the flaw detection instrument 324 moves forward along the bearing roller 312 toward the inside of the steel pipe workpiece 11, the flaw detection instrument 324 is in a horizontal position to inspect the inner wall of the steel pipe workpiece 11. When the flaw detection instrument 324 moves back along the bearing roller 312 toward the electrical control cabinet 1, the flaw detection instrument 324 switches to an inclined position to inspect the inner wall of the steel pipe workpiece 11 at a lateral tilt angle.

[0020] It should be noted that the feeding module 2 includes a support base 21, and a number of support frames 22 are fixedly connected to the upper surface of the support base 21. Limiting roller groups 23 are assembled in an array on the support frames 22. The limiting roller group 23 is composed of roller shafts that are inclined on both sides and roller shafts that are horizontally distributed at the bottom. The roller shaft at the bottom cooperates with the roller shafts on both sides to form a three-point support limiting structure. Through the synchronous rotation of several limiting roller groups 23, it is used to stably transport the steel pipe workpiece 11 and to form radial limiting adjustment of the steel pipe workpiece 11 during the transport process.

[0021] It should be added that the function of the feeding module 2 is to provide stable conveying support, position guidance, and an orderly preparation process for the steel pipe workpiece 11 to be inspected: such as Figure 2 and Figure 3As shown, in the prior art, the feeding process of the steel pipe workpiece 11 adopts two modes: axial linear conveying and lateral flipping positioning. Whether it is linearly pushed along the predetermined conveying direction or adjusted by lateral flipping to return to its original position, the support base 21 serves as the overall bearing foundation. Several support frames 22 are used to orderly assemble the limiting roller group 23. Specifically, the combination of the inclined roller shafts on both sides and the horizontally distributed roller shafts at the bottom forms a three-point support and limiting structure. This structure can not only stably support the corrosion-resistant seamless steel pipes of different specifications and prevent deviation, shaking or tipping during the conveying process, but also complete the smooth conveying and posture correction of the steel pipe workpiece 11 through the synchronous rotation of several limiting roller groups 23. After the steel pipe workpiece 11 is adjusted by the two feeding modes, it can finally be placed in an orderly and complete manner on the support frame 22, ensuring that the steel pipe workpiece 11 always maintains the conveying path coaxial with the visual flaw detection mechanism 3, laying the foundation for the subsequent reverse synchronous feeding and non-contact equidistant flaw detection of the bearing roller 312.

[0022] like Figures 2 to 7 As shown, the feed drive assembly 31 includes a drive gear 311 and a rack plate 313. The drive gear 311 is rotatably connected to the inside of the electrical control cabinet 1. The rack plate 313 is fixedly connected to the lower part of the bearing roller 312 along the axial direction of the bearing roller 312 and meshes with the drive gear 311 to transmit power to drive the bearing roller 312 to move linearly back and forth along the axis of the steel pipe workpiece 11. The bearing roller 312 has a hollow groove 314 inside, and a counterweight block group 315 is assembled in the hollow groove 314. The counterweight block group 315 is composed of several split counterweight blocks. Each counterweight block is arranged sequentially along the axial direction of the bearing roller 312, and the counterweight density and overall axial dimension gradually increase in the direction away from the drive gear 311. By increasing the counterweight at the cantilever end of the bearing roller 312 in a gradient manner, the downward tendency of the cantilever end of the bearing roller 312 caused by its own weight is offset, ensuring that the bearing roller 312 remains horizontal and coaxial throughout the entire process.

[0023] Specifically, the feed drive assembly 31 provides stable power drive and attitude maintenance for the bearing roller 312: the drive gear 311 rotates under the power source in the electrical control cabinet 1, and through meshing transmission with the rack plate 313, converts the rotational motion into linear reciprocating motion of the bearing roller 312 along the axis of the steel pipe workpiece 11, providing a feed basis for the reciprocating scanning of the flaw detector 324; at the same time, the counterweight block assembly 315 in the hollow groove 314 inside the bearing roller 312 forms a progressive counterweight at the cantilever end of the bearing roller 312 through the split counterweight blocks with progressively increasing weight along the axial direction, and the drive gear 311 serves as the entire feed drive. When the bearing roller 312 is fully inserted into the steel pipe workpiece 11, the drive gear 311 and the counterweight block group 315 are located at the two ends of the bearing roller 312, respectively. The two-end opposing layout formed by the drive gear 311 and the gradient counterweight block group 315 not only counteracts the downward tendency of the cantilever end of the bearing roller 312 by the counterweight, but also, in conjunction with the meshing support point of the drive gear 311, constructs a stable double-end balance structure. On the other hand, it further improves the coaxiality accuracy of the bearing roller 312 during long-stroke movement, effectively ensuring the equidistant detection benchmark between the flaw detector 324 and the axis of the steel pipe workpiece 11 throughout the entire process.

[0024] like Figure 8 As shown, the hollow groove 314 is equipped with several buffer flexible shafts 316. The buffer flexible shafts 316 are inserted between adjacent counterweight blocks in the counterweight block group 315. Their two ends are fixedly connected to the inner walls of the two ends of the bearing roller 312, respectively, to buffer the impact load generated by the bearing roller 312 during movement and attitude switching.

[0025] Specifically, such as Figure 8 As shown, the buffer flexible shaft 316 can absorb the inertial impact generated by the counterweight block group 315 when the bearing roller 312 starts, stops, or reverses, avoiding rigid collision between the counterweight blocks and the inner wall of the bearing roller 312, thus improving the stability and reliability of the structure. On the other hand, it can axially limit each counterweight block, preventing it from shifting during the movement of the bearing roller 312, ensuring the distribution accuracy of the gradient counterweight, and further enhancing the attitude maintenance effect of the bearing roller 312.

[0026] like Figure 2 , Figures 9 to 11As shown, the flaw detection switching assembly 32 includes a drive base 321, which is slidably sleeved on the outer wall of the supporting roller 312. A limiting protrusion 317 is fixedly connected to the outer wall of the supporting roller 312. Guide rollers are mounted on the drive base 321 at positions corresponding to the limiting protrusion 317. The drive base 321 rolls along the surface of the limiting protrusion 317 via the guide rollers. The flaw detection switching assembly 32 also includes a mounting base 322, a limiting support shaft 323, an adsorption shaft 325, a convex edge base plate 326, and a magnetic suction plate 327. The adsorption shaft 325 is made of ferromagnetic material. When the flaw detection instrument 324 moves along the supporting roller 312 to the steel... When the other end of the tube workpiece 11 is fully extended inside, the adsorption shaft 325 and the magnetic suction plate 327 on the convex edge substrate 326 are in the same vertical plane. Under the action of the magnetic attraction force between the magnetic suction plate 327 and the adsorption shaft 325, the drive mounting base 322 drives the flaw detector 324 to rotate in attitude. The end closer to the magnetic suction plate 327 is tilted upward, and the end away from the magnetic suction plate 327 is tilted downward. The mounting base 322 is fixedly connected to the side wall of the drive base 321, the convex edge substrate 326 is fixedly connected to the end of the bearing roller 312, and the magnetic suction plate 327 is fixedly attached to the surface of the convex edge substrate 326.

[0027] The drive base 321 has an overall U-shaped groove structure, and the width of its groove is adapted to the width of the rack plate 313. This is used to avoid the rack plate 313 and ensure that the mounting base 322 moves smoothly along the carrying roller 312. The flaw detector 324 is hinged to the mounting base 322 through the limiting support shaft 323, allowing the flaw detector 324 to rotate around the axis of the limiting support shaft 323. The axial direction of the limiting support shaft 323 is perpendicular to the radial direction of the carrying roller 312, ensuring that the rotation direction conforms to the magnetic field. Driven by the magnetic attraction force, the flaw detector 324 initially moves along the bearing roller 312 towards the steel pipe workpiece 11 while maintaining a horizontal posture, performing outward horizontal visual flaw detection on the inner wall of the steel pipe workpiece 11. When the flaw detector 324 completes its outward movement and returns along the original path, it switches to an inclined posture under the action of magnetic attraction force, performing return inclined visual flaw detection on the inner wall of the steel pipe workpiece 11. By alternating between the horizontal and inclined detection postures, complementary identification of defects under different lighting angles is achieved.

[0028] Specifically, such as Figure 9 As shown, the flaw detector 324 is initially in a horizontal position. It moves along the bearing roller 312 with the drive base 321 into the steel pipe workpiece 11 to perform horizontal perspective inspection on the inner wall of the steel pipe workpiece 11. During this inspection process, the flaw detector 324 performs a full-range scan with a horizontal perspective facing the inner wall of the steel pipe workpiece 11, which can clearly capture macroscopic defects such as surface and block defects on the inner wall. At the same time, it uses the horizontal incident light conditions to accurately image and detect the flatness and coating integrity of the inner wall of the steel pipe, providing basic data support for subsequent defect identification.

[0029] like Figure 11 As shown, during the return journey, the flaw detector 324 always inspects the inner wall of the steel pipe workpiece 11 in an inclined posture. During this inspection process, the flaw detector 324 performs a secondary scan of the inner wall of the steel pipe from a side-tilted oblique angle, which can effectively capture minute hidden defects such as microcracks and pitting corrosion that are covered by specular reflection and direct light under horizontal angle. This complements the horizontal inspection on the outgoing journey, covering defects that cannot be captured by the horizontal angle, effectively avoiding missed detection problems. At the same time, no additional manual intervention is required to switch the posture, realizing fully automated continuous flaw detection, ensuring inspection efficiency and accuracy.

[0030] The complete working principle of the above implementation method is as follows: First, the feeding module 2 completes the bearing, conveying, and attitude correction of the steel pipe workpiece 11, laying the foundation for subsequent flaw detection. Several support frames 22 are arranged in a linear array, and each support frame 22 is equipped with a limiting roller group 23. The limiting roller group 23 consists of inclined roller shafts on both sides and a horizontal roller shaft at the bottom, forming a three-point support and limiting structure. The steel pipe workpiece 11 can be fed through two modes: axial linear conveying or lateral flipping positioning. Regardless of the mode used, the limiting roller group 23 can stably support the corrosion-resistant seamless steel pipe workpiece 11 of different specifications, preventing deviation, shaking, or tipping during conveying. At the same time, several limiting roller groups 23 rotate synchronously, driving the steel pipe workpiece 11 to be conveyed smoothly and radially limited, ultimately ensuring that the steel pipe workpiece 11 is placed orderly and completely on the support frame 22, ensuring that the steel pipe workpiece 11 always remains coaxial with the visual flaw detection mechanism 3, providing a precise position reference for the subsequent reverse synchronous feeding of the carrying roller 312. Figure 7 As shown, the outer wall of the drive gear 311 is symmetrically connected to the adjustment shaft 3101. By adjusting the position of the adjustment shaft 3101 inside the electrical control cabinet 1 in the vertical direction, the meshing height between the drive gear 311 and the rack plate 313 can be changed simultaneously, thereby adjusting the center height of the bearing roller 312. This allows the axis of the bearing roller 312 to match the center axis of steel pipe workpieces 11 with different inner diameters and specifications, providing a suitable non-contact equidistant inspection benchmark for the inner surface flaw detection of steel pipe workpieces 11 of different sizes. There is no need to replace core components such as the bearing roller 312, which greatly improves the adaptability and versatility of the device for multi-specification corrosion-resistant seamless steel pipes, while simplifying the operation process of specification switching.

[0031] Secondly, the feed drive assembly 31 drives the carrying roller 312 to achieve stable coaxial feeding, providing a non-contact equidistant detection reference for the flaw detector 324. The drive gear 311 inside the electrical control cabinet 1 rotates under the drive of the power source and meshes with the rack plate 313 to convert the rotational motion into linear reciprocating motion of the carrying roller 312 along the axis of the steel pipe workpiece 11. When the steel pipe workpiece 11 moves in the conveying direction, the carrying roller 312 moves synchronously in the opposite direction. After the steel pipe workpiece 11 is conveyed to the position, the carrying roller 312 moves synchronously to the central axis of the steel pipe workpiece 11. At this time, in order to enhance the stability of the carrying roller 312, a gradient counterweight block group 315 is installed in the hollow groove 314 inside it. The counterweight block of each split type gradually increases in density in the direction away from the drive gear 311. The axial dimensions and the drive gear 311 form a balanced structure with opposite ends, effectively ensuring the stability of the bearing roller 312. Since the buffer flexible shaft 316 in the hollow groove 314 passes between adjacent counterweight blocks, a flexible buffer connection structure is formed. Therefore, under the dynamic working conditions such as start-up, stop-start, and reversal of the bearing roller 312, the impact load generated by the inertia of the counterweight block group 315 can be effectively absorbed by the elastic deformation of the buffer flexible shaft 316, avoiding rigid collision between the counterweight blocks and the inner wall of the bearing roller 312. At the same time, the buffer flexible shaft 316 can form a reliable axial limiting constraint on each counterweight block, thereby further ensuring that it maintains a horizontal and coaxial state throughout the actual continuous flaw detection operation, providing a stable equidistant detection benchmark for the flaw detection instrument 324, and improving the consistency and reliability of the detection results.

[0032] Finally, the flaw detection switching component 32 drives the flaw detection instrument 324 to complete dual-attitude reciprocating flaw detection, realize complementary defect identification, and complete the entire visual flaw detection process. The drive base 321 of the flaw detection switching component 32 rolls with the limiting protrusion 317 on the outer wall of the carrying roller 312 through the guide roller, and can slide smoothly back and forth along the carrying roller 312. Its U-shaped groove structure is adapted to the size of the rack plate 313, which can effectively avoid the rack plate 313 and ensure smooth movement. The mounting base 322 on the side wall of the drive base 321 is hinged to the flaw detection instrument 324 through the limiting support shaft 323. The axis of the limiting support shaft 323 is perpendicular to the radial direction of the carrying roller 312, providing accurate guidance for the attitude flipping of the flaw detection instrument 324.

[0033] During flaw detection, the flaw detector 324 initially assumes a horizontal position and moves towards the interior of the steel pipe workpiece 11 along the carrying roller 312 with the drive base 321. It performs a full-range visual scan of the inner wall of the steel pipe workpiece 11 from a horizontal perspective, clearly capturing macroscopic defects such as planar and blocky defects. At the same time, it detects the flatness of the inner wall and the integrity of the coating, and collects basic inspection data. When the carrying roller 312 is fully inserted into the steel pipe workpiece 11, the convex edge base plate 326 fixed at its end and the magnetic suction plate 327 on its surface simultaneously extend out of the steel pipe workpiece 11. When the flaw detector 324 moves to this position, its entire body also extends out of the steel pipe workpiece 11 simultaneously. At this time, the ferromagnetic adsorption shaft 325 aligns with the magnetic suction plate 327. Under the magnetic attraction force, the flaw detector 324 completes the posture flip around the limiting support shaft 323. The entire flipping process is completed outside the steel pipe workpiece 11, avoiding interference with the inner wall.

[0034] After completing the outgoing inspection, the flaw detector 324 maintains its tilted posture and returns along the original path with the drive base 321. It performs a secondary scan of the inner wall of the steel pipe workpiece 11 from a side tilted perspective, effectively capturing minute hidden defects such as microcracks and pitting corrosion that are concealed by mirror reflection and direct light under a horizontal perspective, thus complementing the outgoing horizontal inspection.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A smart visual flaw detection device for corrosion-resistant seamless steel pipes, used for flaw detection treatment of the inner surface of steel pipe workpieces (11), comprising an electrical control cabinet (1), wherein the side of the electrical control cabinet (1) is equipped with a feeding module (2) for carrying the steel pipe workpieces (11), characterized in that, It also includes a visual flaw detection mechanism (3) installed inside the electrical control cabinet (1); The visual flaw detection mechanism (3) includes a feed drive assembly (31), which includes a carrying roller (312). When the steel pipe workpiece (11) moves along the conveying direction, the carrying roller (312) moves synchronously in a straight line in the opposite direction to the steel pipe workpiece (11). When the steel pipe workpiece (11) is conveyed to the position, the carrying roller (312) moves synchronously to the position. The carrying roller (312) is located on the central axis of the steel pipe workpiece (11), providing a non-contact equidistant detection reference that moves linearly along the axis of the steel pipe workpiece (11) for subsequent flaw detection. The visual flaw detection mechanism (3) also includes a flaw detection switching component (32), which includes a flaw detection instrument (324). The flaw detection instrument (324) is mounted on the outside of the bearing roller (312) and can move back and forth linearly along the bearing roller (312). When the flaw detection instrument (324) moves forward along the bearing roller (312) towards the inside of the steel pipe workpiece (11), the flaw detection instrument (324) is in a horizontal position to inspect the inner wall of the steel pipe workpiece (11). When the flaw detection instrument (324) moves back along the bearing roller (312) towards the electrical control cabinet (1), the flaw detection instrument (324) switches to an inclined position to inspect the inner wall of the steel pipe workpiece (11) at a tilt angle.

2. The intelligent visual flaw detection device for corrosion-resistant seamless steel pipes according to claim 1, characterized in that, The feeding module (2) includes a support base (21), and a number of trays (22) are fixedly connected to the upper surface of the support base (21). The trays (22) are arranged in an array to form a set of limit rollers (23). The limiting roller group (23) is composed of roller shafts that are inclined on both sides and roller shafts that are horizontally distributed at the bottom. The roller shaft at the bottom and the roller shafts on both sides cooperate to form a three-point support limiting structure. Through the synchronous rotation of several limiting roller groups (23), it is used to stably transport the steel pipe workpiece (11) and to form radial limiting adjustment of the steel pipe workpiece (11) during the transport process.

3. The intelligent visual flaw detection device for corrosion-resistant seamless steel pipes according to claim 1, characterized in that, The feed drive assembly (31) includes a drive gear (311) and a rack (313). The drive gear (311) is rotatably connected to the inside of the electrical control cabinet (1), and its outer wall is symmetrically rotatably connected to an adjusting shaft (3101). The rack (313) is fixedly connected to the lower part of the bearing roller (312) along the axial direction of the bearing roller (312) and meshes with the drive gear (311) to transmit power to drive the bearing roller (312) to move linearly back and forth along the axis of the steel pipe workpiece (11).

4. The intelligent visual flaw detection device for corrosion-resistant seamless steel pipes according to claim 1, characterized in that, The interior of the bearing roller (312) is provided with a hollow groove (314), and a counterweight block group (315) is assembled in the hollow groove (314). The counterweight block group (315) is composed of several split counterweight blocks. Each counterweight block is arranged sequentially along the axial direction of the bearing roller (312), and the counterweight density and overall axial dimension are gradually increased in the direction away from the drive gear (311). By increasing the counterweight at the cantilever end of the bearing roller (312) in a gradient manner, the downward tendency of the cantilever end of the bearing roller (312) caused by its own weight is offset, and the bearing roller (312) is kept in a horizontal and coaxial state throughout the entire process.

5. The intelligent visual flaw detection device for corrosion-resistant seamless steel pipes according to claim 4, characterized in that, The hollow groove (314) is equipped with several buffer flexible shafts (316). The buffer flexible shafts (316) are inserted between adjacent counterweight blocks in the counterweight block group (315). Their two ends are fixedly connected to the inner walls of the two ends of the bearing roller (312) to buffer the impact load generated by the bearing roller (312) during movement and attitude switching.

6. The intelligent visual flaw detection device for corrosion-resistant seamless steel pipes according to claim 1, characterized in that, The flaw detection switching assembly (32) includes a drive base (321), which is slidably sleeved on the outer wall of the bearing roller (312). A limiting protrusion (317) is fixedly connected to the outer wall of the bearing roller (312). A guide roller is mounted on the drive base (321) at the position corresponding to the limiting protrusion (317). The drive base (321) rolls along the surface of the limiting protrusion (317) through the guide roller.

7. The intelligent visual flaw detection device for corrosion-resistant seamless steel pipes according to claim 6, characterized in that, The flaw detection switching assembly (32) also includes a mounting base (322), a limiting support shaft (323), an adsorption shaft (325), a convex edge base plate (326), and a magnetic suction plate (327). The adsorption shaft (325) is made of ferromagnetic material. When the flaw detector (324) moves along the bearing roller (312) to the other end of the steel pipe workpiece (11) and extends completely inside it, the adsorption shaft (325) and the magnetic suction plate (327) on the convex edge substrate (326) are in the same vertical plane. Under the action of the magnetic attraction force between the magnetic suction plate (327) and the adsorption shaft (325), the mounting base (322) drives the flaw detector (324) to rotate in attitude. The end closer to the magnetic suction plate (327) tilts upward and the end away from the magnetic suction plate (327) tilts downward.

8. The intelligent visual flaw detection device for corrosion-resistant seamless steel pipes according to claim 7, characterized in that, The mounting base (322) is fixedly connected to the side wall of the drive base (321), the convex edge substrate (326) is fixedly connected to the end of the bearing roller (312), and the magnetic suction plate (327) is fixedly attached to the surface of the convex edge substrate (326).

9. The intelligent visual flaw detection device for corrosion-resistant seamless steel pipes according to claim 6, characterized in that, The drive base (321) has a U-shaped groove structure. The width of its groove is adapted to the size of the rack plate (313) to avoid the rack plate (313) and ensure that the mounting base (322) moves smoothly along the bearing roller (312). The flaw detector (324) is hinged to the mounting base (322) through the limiting support shaft (323), so that the flaw detector (324) can be rotated around the axis of the limiting support shaft (323). The axial direction of the limiting support shaft (323) is perpendicular to the radial direction of the bearing roller (312), ensuring that the attitude rotation direction conforms to the drive guide of the magnetic attraction force.

10. The intelligent visual flaw detection device for corrosion-resistant seamless steel pipes according to claim 1, characterized in that, When the flaw detector (324) initially moves along the bearing roller (312) toward the steel pipe workpiece (11), it maintains a horizontal posture and performs outward horizontal visual flaw detection on the inner wall of the steel pipe workpiece (11). When the flaw detector (324) completes the outward movement and returns along the original path, it switches to an inclined posture under the action of magnetic attraction force and performs return inclined visual flaw detection on the inner wall of the steel pipe workpiece (11). By alternating between the horizontal and inclined detection postures, complementary identification of defects under different lighting angles can be achieved.

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