A new material pipeline inner wall defect optical detection device

Abstract

This invention belongs to the field of optical inspection technology for pipeline inner walls, specifically a new optical inspection device for defects in the inner walls of material pipelines. It includes a worktable; a hydraulic cylinder is fixedly connected to the top surface of the worktable at its center; conveyor belts are fixedly connected to both sides of the hydraulic cylinder on the top surface of the worktable, and the two conveyor belts are symmetrically arranged about the hydraulic cylinder; a support plate is fixedly connected to the telescopic end of the hydraulic cylinder. Through the cooperation of the conveyor belts, the support plate, and the hydraulic cylinder, the new material pipeline to be inspected can be transported to a rigid chain output device. The rigid chain output device then drives an optical camera to inspect the new material pipeline. After inspection, the support plate returns the inspected new material pipeline to the conveyor for removal. This eliminates the need for continuous robot adjustments and transfers as required by traditional robotic inspection methods, reduces maintenance difficulty, and eliminates the need for downtime for charging or battery replacement, thereby improving the efficiency of batch inspection.

Description

Technical Field

[0001] This invention belongs to the field of optical inspection technology for pipeline inner walls, specifically a new material optical inspection device for pipeline inner wall defects. Background Technology

[0002] New material pipes refer to pipes manufactured using new materials or composite technologies. They possess superior performance that traditional pipes cannot match. They mainly include ultra-high molecular weight polyethylene pipes, steel-plastic composite pipes, fiberglass pipes, carbon fiber pipes, and other types. Due to their various characteristics, they are widely used in mining, power, chemical, urban water supply, and sewage treatment projects.

[0003] In existing technologies, to ensure that new material pipes meet the final product quality requirements, it is necessary to inspect the manufactured new material pipes. Among these, optical inspection technologies such as CCTV pipe endoscopy, pipe endoscope inspection, laser scanning inspection, fiber optic sensing inspection, and laser-induced fluorescence inspection are commonly used to detect defects in the inner wall of new material pipes. The most widely used technology is CCTV pipe endoscopy. This technology uses a pipe robot equipped with a high-definition camera to crawl inside the pipe and capture images of the inner wall in real time. These images are then transmitted in real time to a computer running a pipe inner wall vision inspection system. Finally, the pipe inner wall vision inspection system analyzes the captured images to determine whether there are defects in the inner wall of the pipe, thus enabling the detection of defects in the inner wall of new material pipes.

[0004] In the aforementioned technologies, when dealing with the inspection of batches of new material pipelines, users need to constantly adjust the pipeline robot to adapt it to the new material pipelines to be inspected in different locations. Furthermore, the pipeline robot also needs to be maintained and recharged, resulting in low inspection efficiency and high maintenance costs.

[0005] Therefore, the present invention provides an optical detection device for defects in the inner wall of a new type of pipe. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A novel optical inspection device for defects in the inner wall of a pipe, comprising a worktable; a hydraulic cylinder fixedly connected to the top surface of the worktable at its center; conveyor belts fixedly connected to both sides of the hydraulic cylinder on the top surface of the worktable, the two conveyor belts being symmetrically arranged about the hydraulic cylinder; a support plate fixedly connected to the telescopic end of the hydraulic cylinder, the support plate being V-shaped; a support base installed on one side of the worktable at the corresponding position of the hydraulic cylinder; a rigid chain output device installed on the top surface of the support base, the rigid chain output device being driven by a servo motor; a detection component installed at the output end of the rigid chain output device; the detection component including multiple optical cameras, used to capture images of the inner wall of the pipe and transmit the image data to an external computer running a pipe inner wall visual inspection system; the pipe inner wall visual inspection system is used to analyze the images to determine whether defects exist in the inner wall of the pipe.

[0008] Preferably, the detection assembly further includes a pair of substrates; a connecting tube is fixedly connected between the two substrates; the optical probe is uniformly fixedly connected to the surface of the connecting tube; a plurality of uniformly arranged rotating plates are rotatably connected to the side surface of the substrates; a roller is rotatably connected to the end of the rotating plate away from the substrate; a double-threaded screw is rotatably connected between the two substrates; both ends of the double-threaded screw are threadedly connected to moving plates; a rotating rod is rotatably connected between the moving plates and the rotating plates; a plurality of uniformly arranged sliding rods are fixedly connected to the side of the substrate near the moving plate, and the moving plate and the sliding rods are slidably connected.

[0009] Preferably, a pair of support bases and rigid chain output devices are provided, and are respectively located on both sides of the worktable; the output ends of the two rigid chain output devices are fixedly connected to baffles; a plug is fixedly connected to the end of the baffle away from the rigid chain output device; a cable assembly is fixedly connected to the side of the baffle away from the plug; the cable assembly is connected to an external computer running a pipe inner wall visual inspection system; a docking plate is fixedly connected to the end of the slide rod away from the base plate; a socket is installed on the side of the docking plate away from the base plate; the socket is connected to the optical probe through a wire, and the socket is compatible with the plug.

[0010] Preferably, a plurality of uniformly arranged electromagnet blocks are fixedly connected to the side of the baffle near the docking plate; a metal block is embedded in the surface of the docking plate at the corresponding position of each electromagnet block, and the metal block is made of magnetizable metal.

[0011] Preferably, the bottom surface of the support base is slidably connected to a base; the base is slidably connected to the top surface of the workbench and fixed by bolts; the support base is driven by a servo motor and can slide on the top surface of the base; an insert plate is fixedly connected to the side of the support base near the baffle; slots are opened at the bottom of both base plates, and the insert plate is adapted to the slot.

[0012] Preferably, a support plate is rotatably connected to the top surface of the support base and the side closest to the worktable; gears are fixedly connected to both sides of the bottom of the support plate; toothed plates are slidably connected to both sides of the support base, and the toothed plates can mesh with the gears; a rotating roller is rotatably connected to the end of the support plate away from the gears.

[0013] Preferably, both ends of the two double-threaded screws penetrate the mating plate; both ends of the double-threaded screws are provided with insertion holes, and the openings of the insertion holes are set in a regular hexagonal shape.

[0014] Preferably, a rotating arm is rotatably connected to one side of the support base; the rotating arm has a through hole away from the support base; a sleeve is rotatably connected in the through hole, and the sleeve is driven by a servo motor inside the rotating arm; a transmission rod is slidably connected in the sleeve, and the end of the transmission rod near the insertion hole is adapted to the insertion hole; a limit post is fixedly connected to one side of the rotating arm on the surface of the support base.

[0015] Preferably, a stop bar is rotatably connected to the side of the rotating arm near the baffle; a stop bar is fixedly connected to the side of the stop bar near the transmission rod, and the end of the stop bar near the stop bar is arc-shaped; a retaining seat is fixedly connected to the side of the rotating arm surface away from the rotating connection point between the stop bar and the rotating arm; a pressure bar is rotatably connected to the top surface of the retaining seat, and the pressure bar is arc-shaped.

[0016] Preferably, the cable assembly includes a reel; the reel is rotatably connected to the side of the support base away from the baffle, and the reel is driven by a servo motor; one end of the reel is provided with a data cable one; one side of the reel is fixedly connected to a data cable two, and the data cable one and the data cable two are connected through an electric slip ring inside the reel; the data cable two is connected to an external computer.

[0017] The beneficial effects of this invention are as follows: 1. The optical inspection device for inner wall defects of new material pipes described in this invention, through the cooperation of a conveyor belt, a support plate, and a hydraulic cylinder, can transport the new material pipe to be inspected to a rigid chain output device. Then, the rigid chain output device drives an optical camera to inspect the new material pipe. After the inspection is completed, the support plate puts the inspected new material pipe back to the conveyor and sends it away. This eliminates the need for constant debugging and transfer of the robot as in traditional robot inspection, reduces maintenance difficulty, and eliminates the need for downtime for charging or battery replacement, thereby improving the efficiency of batch inspection.

[0018] 2. The optical detection device for defects in the inner wall of a new material pipe, as described in this invention, uses a rotating plate and rollers to press against the inner wall of the new material pipe, thereby supporting the substrate, connecting pipe, and optical camera. This allows the rigid chain output device to be pushed horizontally, and it no longer bears the additional weight of the optical camera in the vertical direction. This avoids the rigid chain of the rigid chain output device from becoming skewed due to its own weight and the weight of the optical camera during the output process, thus preventing the normal detection of the optical camera. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the support plate in this invention; Figure 3 This is a schematic diagram of the substrate structure in this invention; Figure 4 This is a schematic diagram of the baffle structure in this invention; Figure 5 This is a schematic diagram of the support base in this invention; Figure 6 This is a schematic diagram of the support plate in this invention; Figure 7 This is a schematic diagram of the rotating arm in this invention; Figure 8 This is a schematic diagram of the structure of the stop bar in this invention; In the diagram: 1. Workbench; 2. Hydraulic cylinder; 3. Conveyor belt; 4. Support plate; 5. Support base; 6. Rigid chain output device; 7. Optical camera; 8. Base plate; 9. Connecting pipe; 10. Rotating plate; 11. Roller; 12. Double-threaded screw; 13. Moving plate; 14. Rotating rod; 15. Slide rod; 16. Baffle; 17. Plug; 18. Connecting plate; 19. Socket; 20. Electromagnet block; 21. Metal block; 22. Base; 23. Insert plate; 24. Slot; 25. Support plate; 26. Gear; 27. Tooth plate; 28. Rotating roller; 29. ​​Insertion hole; 30. Rotating arm; 31. Through hole; 32. Sleeve; 33. Transmission rod; 34. Limiting post; 35. Stop bar; 36. Abutment bar; 37. Card seat; 38. Pressure bar; 39. Winding spool; 40. Data cable one; 41. Data cable two. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 2As shown in the embodiment of the present invention, a novel optical inspection device for defects in the inner wall of a pipe includes a worktable 1; a hydraulic cylinder 2 is fixedly connected to the top surface of the worktable 1 at the center position; conveyor belts 3 are fixedly connected to both sides of the hydraulic cylinder 2 on the top surface of the worktable 1, and the two conveyor belts 3 are symmetrically arranged about the hydraulic cylinder 2; a support plate 4 is fixedly connected to the telescopic end of the hydraulic cylinder 2, and the support plate 4 is V-shaped; a support base 5 is installed on one side of the worktable 1 at the corresponding position of the hydraulic cylinder 2; a rigid chain output device 6 is installed on the top surface of the support base 5, and the rigid chain output device 6 is driven by a servo motor; a detection component is installed at the output end of the rigid chain output device 6; the detection component includes multiple optical cameras, namely optical cameras 7, used to capture images of the inner wall of the pipe and transmit the image data to an external computer running a pipe inner wall visual inspection system; the pipe inner wall visual inspection system is used to analyze the images to determine whether there are defects in the inner wall of the pipe.

[0023] Specifically, the visual inspection system for the inner wall of the pipe includes an information receiving module, a feature comparison module, and a defect marking module. The information receiving module receives image data of the inner wall of the pipe captured by the optical camera 7. The feature comparison module analyzes the image to identify defects. Specifically, this module first preprocesses the received raw image, including Gaussian filtering for noise reduction and histogram equalization enhancement. Then, it uses a deep learning-based U-Net segmentation network to perform pixel-level segmentation on the preprocessed image. This U-Net network has been trained on a dataset containing a large number of pipe inner wall images labeled with typical defects such as cracks, pits, and scratches. The segmentation result generates a defect probability map with the same size as the input image. A threshold (e.g., 0.5) is set to adjust the probability. Figure 2 Value-based quantization yields the mask for the defect area; the defect marking module determines the presence of a defect in the inner wall of the pipe when a non-zero pixel region exists in the segmentation result of the feature comparison module.

[0024] Furthermore, the training of the aforementioned U-Net network employs a cross-entropy loss function and the Adam optimizer, which are standard techniques for training such segmentation networks in this field. The training process of the U-Net network can be as follows: First, a large number of images of the inner wall of a new material pipe are acquired under the same or similar lighting, viewing angle, and imaging conditions as the actual detection. Typical defect areas such as cracks, pits, scratches, and corrosion are manually labeled pixel by pixel to form a binary mask label image corresponding one-to-one with the original image. Positive samples (defect areas) are labeled as 1, and the background is labeled as 0. The training set consisting of the above image-label pairs is divided into a training set, a validation set, and a test set. The U-Net network adopts an encoder-decoder structure. Its encoder part extracts high-level semantic features through multi-layer convolution and downsampling, and its decoder part gradually restores spatial resolution through upsampling and skip connections. The network training uses a binary cross-entropy loss function and the Adam optimizer. The cross-entropy loss function was used, the optimizer was Adam, and the initial learning rate was set to 0.001. A learning rate decay strategy was implemented when the validation set loss stopped decreasing after 5 consecutive epochs. During training, data augmentation operations such as random rotation, brightness perturbation, and Gaussian noise were applied to the input image to improve the model's generalization ability. After training, the model achieved a pixel-level segmentation IoU (Intersection over Union) of over 0.85 on the independent test set, indicating reliable defect recognition capabilities. During the inference phase, the trained U-Net network forward-propagated the preprocessed real-time detection image, outputting a single-channel defect probability map of the same size as the input image. Each pixel value in the map represented the probability that the location belonged to a defect. Subsequently, the system set a threshold (e.g., 0.5) for this probability map, setting pixels greater than or equal to the threshold to 1 and the rest to 0, thereby generating a binarized defect region mask. The specific working process of the above-mentioned defect marking module is as follows: when there is at least one non-zero region with a pixel value of 1 in the defect region mask generated by the feature comparison module, the system determines that there is a defect in the local area of ​​the pipe inner wall corresponding to the frame image; further, the system performs clustering based on the connectivity of the non-zero region, separates multiple independent defect instances, and calculates the geometric features of each instance, including area, perimeter, aspect ratio, principal axis direction, and Hu moment invariant. These features are matched with the preset defect type rule library - for example, a region with a small area, large aspect ratio, and irregular principal axis direction is judged as a crack, a region with a medium area and approximately circular shape is judged as a pit, and a region with linear extension and sharp edges is judged as a scratch; Finally, the system automatically reads the progress signal of the servo motor, combines it with the transmission ratio parameters of the rigid chain output device 6, calculates the axial travel length of the current optical camera 7, and combines it with the circumferential rotation angle of the probe itself to determine the specific position of each defect in the three-dimensional coordinate system of the pipeline. All judgment results, including defect image screenshots, defect types, axial depths, and circumferential angles, are integrated to generate a structured analysis report, which is then output to the display screen of an external computer for visualization. At the same time, an audible and visual alarm is triggered to remind staff to check and handle the issue in a timely manner.

[0025] Specifically, the rotation angle pulse signal of the servo motor is acquired in real time by a high-precision encoder. This signal is converted into the cumulative number of rotations N of the servo motor by the controller. The rigid chain output device 6 is directly coupled to the servo motor through a gear pair. Its transmission ratio i is defined as the linear distance (unit: mm / rev) that the rigid chain output device 6 is driven to move forward by one rotation of the servo motor. The current axial travel length L of the optical camera 7 can be calculated by the formula L=Ni. At the same time, the optical camera 7 is mounted on a pan-tilt unit that can rotate around the pipe axis. Its circumferential rotation angle θ is fed back to the system in real time by the built-in angle sensor. The angle range is 0° to 360°. When the system determines that there is a defect in a certain frame of image, it immediately latches the L and θ values ​​corresponding to the acquisition time of the frame of image. Combined with the relative coordinates of the defect pixel in the image within the probe's field of view (converted by camera intrinsic parameters and probe field of view angle), the three-dimensional position (r, θ, L) of the defect in the cylindrical coordinate system with the pipe inlet as the origin and the pipe axis as the Z-axis is finally determined. The radial distance r is approximately equal to the inner radius of the pipe. During operation, to facilitate optical inspection of the inner walls of batches of new material pipes, this embodiment of the invention can be used. First, place the top surfaces of two conveyor belts 3 at both ends of the new material pipe to be inspected. The conveyor belts 3 transport the new material pipe to be inspected to the support plate 4. Then, the hydraulic cylinder 2 is activated, lifting the new material pipe to the rigid chain output device 6 at the top of the support base 5, aligning the central axis of the new material pipe with the rigid chain of the rigid chain output device 6. The rigid chain output device 6 then pushes the optical camera 7 to extend into the interior of the new material pipe. Simultaneously, the optical camera 7 is activated and captures images of the inner wall of the new material pipe to obtain image data. This image data is then transmitted to an external computer and compared with the pipe inner wall visual inspection system within the external computer to determine whether there are defects inside the new material pipe. After the inspection is completed, the rigid chain... The output device 6 pulls the optical camera 7 out of the new material pipe, and then the hydraulic cylinder 2 descends, placing the new material pipe at the support plate 4 on the top surface of the two conveyor belts 3. Then, the conveyor belts 3 send the inspected new material pipe away, while the other end of the conveyor belts 3 transports the new material pipe to be inspected to the support plate 4. Thus, through the cooperation of the conveyor belts 3, the support plate 4, and the hydraulic cylinder 2, the new material pipe to be inspected can be transported to the rigid chain output device 6. Then, the rigid chain output device 6 drives the optical camera 7 to inspect the new material pipe. After the inspection is completed, the support plate 4 puts the inspected new material pipe back to the conveyor and sends it away. This eliminates the need for constant debugging and transfer of the robot as in traditional robot inspection, reduces maintenance difficulty, and eliminates the need for downtime charging or battery replacement, thereby improving the efficiency of batch inspection.

[0026] like Figures 2 to 3As shown, the detection assembly also includes a pair of substrates 8; a connecting tube 9 is fixedly connected between the two substrates 8; the optical probe is uniformly fixedly connected to the surface of the connecting tube 9; a plurality of uniformly arranged rotating plates 10 are rotatably connected to the side surface of the substrates 8; a roller 11 is rotatably connected to the end of the rotating plate 10 away from the substrate 8; a double-threaded screw 12 is rotatably connected between the two substrates 8; both ends of the double-threaded screw 12 are threadedly connected to moving plates 13; a rotating rod 14 is rotatably connected between the moving plate 13 and the rotating plate 10; a plurality of uniformly arranged sliding rods 15 are fixedly connected to the side of the substrate 8 near the moving plate 13, and the moving plate 13 is slidably connected to the sliding rods 15; during operation, before batch testing of new material tubes, the user performs an adaptation operation through the first new material tube to be tested, that is, the rigid chain output device 6 inserts the substrate 8 into one end of the new material tube to be tested, and then the user screws the double-threaded screw 12, which drives the two moving plates 13 along the sliding rods. 15. The moving plate 13 moves closer to or further away from the rotating rod 14, which in turn moves the rotating plate 10 connected to the rotating rod 14, causing it to rotate towards or away from the double-toothed screw 12. This allows the roller 11 at the end of the rotating plate 10 to fit snugly against the inner wall of the new material pipe. At this point, the rigid chain output device 6 only needs to push or pull the double-toothed screw 12 to move the connecting pipe 9 between the two base plates 8 and the optical camera 7 within the new material pipe. The rotating plate 10 and roller 11 press against the inner wall of the new material pipe, thus supporting the base plate 8, connecting pipe 9, and optical camera 7. This allows the rigid chain output device 6 to push horizontally, without bearing the additional weight of the optical camera 7 in the vertical direction. This prevents the rigid chain of the rigid chain output device 6 from becoming skewed due to its own weight and the weight of the optical camera 7 during output, which would affect the normal detection of the optical camera 7.

[0027] like Figures 3 to 4As shown, a pair of support bases 5 and rigid chain output devices 6 are provided, and are respectively located on both sides of the workbench 1; the output ends of the two rigid chain output devices 6 are fixedly connected to baffles 16; a plug 17 is fixedly connected to the end of the baffle 16 away from the rigid chain output device 6; a cable assembly is fixedly connected to the side of the baffle 16 away from the plug 17; the cable assembly is connected to an external computer running a pipe inner wall visual inspection system; a docking plate 18 is fixedly connected to the end of the slide rod 15 away from the base plate 8; a... Socket 19; Socket 19 is connected to the optical probe via a wire, and Socket 19 is compatible with plug 17; During operation, when inspecting a long new material pipe, the rigid chain output device 6 on one side pushes the baffle 16, which in turn pushes the docking plate 18, allowing the optical camera 7 between the two clamps to extend into the new material pipe. During this process, the plug 17 on the surface of the baffle 16 connects to the socket 19 on the surface of the docking plate 18, thereby ensuring continuous power supply and signal transmission for the optical camera 7. Afterwards, when the optical... After camera 7 has completely passed through the new material pipeline, the user disconnects the socket 19 and plug 17 between the baffle 16 on one side of the push docking plate 18 and the docking plate 18, and aligns the docking plate 18 on the other side with the baffle 16 on the other side of the rigid chain output device 6. Then, the rigid chain output device 6 retracts the baffle 16 on that side back to its position. Afterward, the rigid chain output device 6 on the other side pulls the substrate 8, connecting tube 9, and optical camera 7 out of the new material pipeline. Subsequently, the new material pipeline that was being inspected is transported away by the conveyor belt 3, and another... After the new material pipeline is moved between the two support seats 5, the rigid chain output device 6, which is connected to the substrate 8, the connecting pipe 9 and the optical camera 7, pushes the substrate 8, the connecting pipe 9 and the optical camera 7 back into the new material pipeline and repeats the above detection operation. This means that the substrate 8, the connecting pipe 9 and the optical camera 7 only need to pass through the new material pipeline once for each detection, unlike a single rigid chain output device 6, which has to push and pull the optical camera 7 back and forth in the new material pipeline for each detection. This improves the detection efficiency of the new material pipeline.

[0028] like Figures 3 to 4As shown, a plurality of uniformly arranged electromagnet blocks 20 are fixedly connected to the side of the baffle 16 near the docking plate 18; a metal block 21 is embedded in the surface of the docking plate 18 at the corresponding position of each electromagnet block 20, and the metal block 21 is made of magnetizable metal; during operation, when the rigid chain output device 6 on one side pushes the optical camera 7 into the middle of the new material pipe, the electromagnet block 20 at the baffle 16 on that side is de-energized, so that the electromagnet block 20 no longer attracts the metal block 21, while the electromagnet block 20 at the baffle 16 on the other side is energized and attracts the metal block 21. Driven by the replacement optical camera 7, the optical camera 7 changes from being pushed by one rigid chain output device 6 to being pulled by the other rigid chain output device 6. Thus, through the cooperation of the two rigid chain output devices 6, the optical camera 7 completes the detection of the entire inner wall of the new material pipe, so that the maximum length of the new material pipe that can be detected is the maximum length of the chain that the two rigid chain output devices 6 can output, thereby improving the applicability of this embodiment.

[0029] like Figures 5 to 6 As shown, the bottom surface of the support base 5 is slidably connected to the base 22; the base 22 is slidably connected to the top surface of the workbench 1 and fixed by bolts; the support base 5 is driven by a servo motor and can slide on the top surface of the base 22; an insert plate 23 is fixedly connected to the side of the support base 5 near the baffle 16; slots 24 are opened at the bottom of both substrates 8, and the insert plate 23 is adapted to the slots 24; during operation, when one side drives the rigid chain output device 6 to pull the substrate 8 out of the new material pipe, the insert plate 23 on the surface of the support base 5 will be inserted into the slots 24 at the bottom of the two substrates 8. At this time, the insert plate 23 can not only restrict the sliding of the substrate 8, but also support the substrate 8, thereby preventing the substrate 8 and its various components from pressing on the chain of the rigid chain output device 6 after the substrate 8 is completely pulled out of the new material pipe, which would cause damage or bending deformation of the rigid chain.

[0030] like Figures 5 to 6 As shown, a support plate 25 is rotatably connected to the top surface of the support base 5 and the side closest to the workbench 1; gears 26 are fixedly connected to both sides of the bottom of the support plate 25; toothed plates 27 are fixedly connected to both sides of the support base 5, and the toothed plates 27 can mesh with the gears 26; a rotating roller 28 is rotatably connected to the end of the support plate 25 away from the gears 26; during operation, when the insert plate 23 is inserted into the slot 24 at the bottom of the substrate 8, the support base 5 will slide along the base 22, thereby pulling out the new material pipe from the substrate 8. During the movement, the toothed plates 27 on both sides of the support plate 25 will move with the support base 5 and mesh with the gears 26 on the surface of the support plate 25, thereby driving the support plate 25 to rotate 90 degrees, so that the rotating roller 28 at its end abuts against the bottom surface of the insert plate 23, thereby providing support for the insert plate 23 and preventing the insert plate 23 from bending and deforming because only one end of the insert plate 23 is supported.

[0031] like Figure 3 , Figure 7 and Figure 8 As shown, both ends of the two double-threaded screws 12 penetrate the mating plate 18; both ends of the double-threaded screws 12 are provided with insertion holes 29, and the openings of the insertion holes 29 are set in a regular hexagonal shape; during operation, when the user needs to rotate the double-threaded screws 12, the user needs to first ensure that the insertion plate 23 is inserted into the slot 24 on the surface of the base plate 8, and then the user only needs to insert the Allen wrench into the insertion hole 29 at either end of the double-threaded screw 12, and then the user rotates the Allen wrench. Since the base plate 8 is restricted by the insertion plate 23, the base plate 8 will not rotate with it when the double-threaded screws 12 are rotated, thereby reducing the difficulty of operation for the user.

[0032] like Figure 3 As shown, a rotating arm 30 is rotatably connected to one side of the support base 5; a through hole 31 is opened on the rotating arm 30 away from the support base 5; a sleeve 32 is rotatably connected in the through hole 31, and the sleeve 32 is driven by a servo motor inside the rotating arm 30; a transmission rod 33 is slidably connected in the sleeve 32, and the end of the transmission rod 33 near the insertion hole 29 is adapted to the insertion hole 29; a limit post 34 is fixedly connected to one side of the rotating arm 30 on the surface of the support base 5; during operation, in order to facilitate the user to tighten the double-threaded screw 12, the user can, after inserting the insertion plate 23 into the slot 24, control the rigid chain output device 6 to drive the baffle 16 to continue away from the docking plate 18, so that there is a gap between the docking plate 18 and the baffle 16. After creating a gap, the rotating arm 30 is rotated so that it rotates towards the limiting post 34, causing the surface of the rotating arm 30 to rest against the surface of the limiting post 34. At this time, the through hole 31 at the end of the rotating arm 30 is aligned with the end of the double-threaded screw 12. Then, the user slides the transmission rod 33 inside the sleeve 32 so that the end of the transmission rod 33 is inserted into the insertion hole 29 on the end face of the double-threaded screw 12. Then, the user drives the sleeve 32 to rotate through the servo motor inside the rotating arm 30, which in turn drives the transmission rod 33, and finally the transmission rod 33 drives the double-threaded screw 12 to rotate. This makes it easier for the user to adjust the opening angle of the rotating plate 10 and further reduces the difficulty of operation for the user.

[0033] like Figure 3 , Figure 7 and Figure 8As shown, a stop bar 35 is rotatably connected to the side of the rotating arm 30 near the baffle 16; a stop bar 36 is fixedly connected to the side of the stop bar 35 near the transmission rod 33, and the end of the stop bar 36 near the stop bar 35 is arc-shaped; a retaining seat 37 is fixedly connected to the side of the rotating arm 30 away from the rotational connection point between the stop bar 35 and the rotating arm 30; a pressure bar 38 is rotatably connected to the top surface of the retaining seat 37, and the pressure bar 38 is arc-shaped; during operation, after the transmission rod 33 is inserted into the double-threaded screw 12, the user still needs to rotate the stop bar. 35, so that the lower bar on the surface of the stop rod 35 abuts against the end face of the transmission rod 33, and one end of the stop rod 35 is fastened to the top surface of the card seat 37. Then the user rotates the pressure rod 38, so that the pressure rod 38 presses against the surface of the stop rod 35, thereby fixing the position of the stop rod 35. At this time, when the sleeve 32 drives the transmission rod 33 to rotate, the abutment 36 on the surface of the stop rod 35 will provide pressure to the transmission rod 33, so that the transmission rod 33 can always be inserted into the insertion hole 29, preventing the transmission rod 33 from accidentally coming out of the insertion hole 29 at the end of the double thread screw 12.

[0034] like Figure 1 , Figure 2 and Figure 5 As shown, the cable assembly includes a reel 39; the reel 39 is rotatably connected to the side of the support base 5 away from the baffle 16, and the reel 39 is driven by a servo motor; one end of the reel 39 is provided with a data cable 40; a second data cable 41 is fixedly connected to one side of the reel 39, and the first data cable 40 and the second data cable 41 are connected through an electric slip ring inside the reel 39; the second data cable 41 is connected to an external computer running a pipe inner wall visual inspection system; during operation, because the new material pipe itself will affect the wireless data transmission, and in order to ensure the clarity of the image data captured by the optical camera 7 so that the pipe inner wall visual inspection system can better compare defects, the image data captured by the optical camera 7 itself is very large, therefore, the first data cable 40 and the second data cable 41 are selected for this purpose. Instead of using wireless data transmission solutions such as Bluetooth or WIFI, the first data cable 40 and the second data cable 41 can also act as a power supply system to power the optical camera 7, thereby avoiding the use of high-energy-density batteries and reducing the cost of this embodiment of the invention. When the rigid chain output device 6 drives the baffle 16 to move, the servo motor will also drive the winding shaft 39 to rotate, thereby winding and unwinding the first data cable 40, so that the first data cable 40 is kept taut, thus preventing the first data cable 40 from getting caught on the rotating plate 10 or the rotating rod. At the same time, the second data cable 41 is connected to the first data cable 40 through an electric slip ring, which ensures data and power transmission while also preventing the second data cable 41 from rotating together with the first data cable 40, thus preventing the second data cable 41 from getting tangled with the external computer.

[0035] The detection device described in this embodiment of the invention has the following specific detection method: S1. First, the conveyor belt 3 will transport the new material pipe to be tested to the top surface of the support plate 4. Then, the support plate 4 will rise under the drive of the hydraulic cylinder 2 and align the axis of the new material pipe with the rigid chain output device 6. S2. Subsequently, the rigid chain output device 6 pushes the optical camera 7 and the support structure consisting of the substrate 8, connecting pipe 9, rotating plate 10, roller 11 and rotating rod 14 into the pipe. Then, the optical camera 7 captures an image of the inner wall and transmits the image data to an external computer through data cable 40 and data cable 41. The external computer then analyzes the image data using a visual inspection system for the inner wall of the pipe. S3. After the optical camera 7 is pushed to the middle of the pipe by the rigid chain output device 6 on one side, the driving power is transferred to the rigid chain output device 6 on the other side by the attraction of the electromagnet block 20, so as to complete the detection of the entire inner wall of the new material pipe. S4. Finally, the rigid chain output device 6 pulls the optical camera 7 out of the new material pipe. Then, driven by the hydraulic cylinder 2 and the support plate 4, the new material pipe descends back to the top surface of the conveyor belt 3 and is transported away by it. Subsequently, the new material pipe to be inspected is transported by the conveyor belt 3 to the support plate 4 for a new round of inspection.

[0036] In summary, the embodiments of the present invention achieve efficient, stable and continuous optical inspection of the inner wall of pipelines made of batches of new materials through optical camera 7, adaptively adjustable detection mechanism and dual-end collaborative driving strategy.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel optical inspection device for defects in the inner wall of pipes made of new materials, characterized in that: The system includes a workbench; a hydraulic cylinder is fixedly connected to the top surface of the workbench at its center; conveyor belts are fixedly connected to both sides of the hydraulic cylinder on the top surface of the workbench, and the two conveyor belts are symmetrically arranged about the hydraulic cylinder; a support plate is fixedly connected to the telescopic end of the hydraulic cylinder, and the support plate is V-shaped; a support base is installed on one side of the workbench at the corresponding position of the hydraulic cylinder; a rigid chain output device is installed on the top surface of the support base, and the rigid chain output device is driven by a servo motor; a detection component is installed at the output end of the rigid chain output device; the detection component includes multiple optical cameras, which are used to capture images of the inner wall of the pipe and transmit the image data to an external computer running a pipe inner wall visual inspection system; the pipe inner wall visual inspection system is used to analyze the images to determine whether there are defects in the inner wall of the pipe.

2. The optical inspection device for defects in the inner wall of a new material pipeline according to claim 1, characterized in that: The detection assembly further includes a pair of substrates; a connecting tube is fixedly connected between the two substrates; the optical probe is uniformly fixedly connected to the surface of the connecting tube; a plurality of uniformly arranged rotating plates are rotatably connected to the side surface of the substrates; a roller is rotatably connected to the end of the rotating plate away from the substrate; a double-threaded screw is rotatably connected between the two substrates; both ends of the double-threaded screw are threadedly connected to moving plates; a rotating rod is rotatably connected between the moving plates and the rotating plates; a plurality of uniformly arranged sliding rods are fixedly connected to the side of the substrate near the moving plate, and the moving plate and the sliding rods are slidably connected.

3. The optical detection device for defects in the inner wall of a new material pipeline according to claim 2, characterized in that: The support base and the rigid chain output device are each provided in pairs and are located on both sides of the worktable; the output ends of the two rigid chain output devices are fixedly connected to baffles; a plug is fixedly connected to the end of the baffle away from the rigid chain output device; a cable assembly is fixedly connected to the side of the baffle away from the plug; the cable assembly is connected to an external computer for transmitting image data; a docking plate is fixedly connected to the end of the slide bar away from the base plate; a socket is installed on the side of the docking plate away from the base plate; the socket is connected to the optical probe through a wire, and the socket is compatible with the plug.

4. The optical inspection device for defects in the inner wall of a new material pipeline according to claim 3, characterized in that: A plurality of uniformly arranged electromagnet blocks are fixedly connected to the side of the baffle near the docking plate; a metal block is embedded in the surface of the docking plate at the corresponding position of each electromagnet block, and the metal block is made of magnetizable metal.

5. The optical inspection device for defects in the inner wall of a new material pipeline according to claim 4, characterized in that: The bottom surface of the support base is slidably connected to a base; the base is slidably connected to the top surface of the workbench and is fixed by bolts; the support base is driven by a servo motor and can slide on the top surface of the base; an insert plate is fixedly connected to the side of the support base near the baffle; slots are opened at the bottom of both base plates, and the insert plate is adapted to the slot.

6. The optical inspection device for defects in the inner wall of a new material pipeline according to claim 5, characterized in that: A support plate is rotatably connected to the top surface of the support base and the side closest to the workbench; gears are fixedly connected to both sides of the bottom of the support plate; toothed plates are slidably connected to both sides of the support base, and the toothed plates can mesh with the gears; a rotating roller is rotatably connected to the end of the support plate away from the gears.

7. The optical detection device for defects in the inner wall of a new material pipeline according to claim 2, characterized in that: Both ends of the two double-threaded screws penetrate the mating plate; both ends of the double-threaded screws are provided with insertion holes, and the openings of the insertion holes are set in a regular hexagonal shape.

8. The optical inspection device for defects in the inner wall of a new material pipeline according to claim 7, characterized in that: A rotating arm is rotatably connected to one side of each support base; a through hole is opened on the rotating arm away from the support base; a sleeve is rotatably connected in the through hole, and the sleeve is driven by a servo motor inside the rotating arm; a transmission rod is slidably connected in the sleeve, and the end of the transmission rod near the insertion hole is adapted to the insertion hole; a limit post is fixedly connected to one side of the rotating arm on the surface of the support base.

9. The optical detection device for defects in the inner wall of a new material pipeline according to claim 8, characterized in that: A stop bar is rotatably connected to the side of the rotating arm near the baffle; a stop bar is fixedly connected to the side of the stop bar near the transmission rod, and the end of the stop bar near the stop bar is arc-shaped; a retaining seat is fixedly connected to the side of the rotating arm surface away from the rotating connection point between the stop bar and the rotating arm; a pressure bar is rotatably connected to the top surface of the retaining seat, and the pressure bar is arc-shaped.

10. The optical detection device for defects in the inner wall of a new material pipeline according to claim 3, characterized in that: The cable assembly includes a reel; the reel is rotatably connected to the side of the support base away from the baffle, and the reel is driven by a servo motor; one end of the reel is provided with a data cable one; one side of the reel is fixedly connected to a data cable two, and the data cable one and the data cable two are connected through an electric slip ring inside the reel; the data cable two is connected to an external computer.

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