A detection device for spray painting

Abstract

This invention provides a coating inspection device, comprising: a moving frame, a drive mechanism, an elastic telescopic component, an eccentric rotating shaft, a receiving box, a camera, and a cleaning mechanism. This device eliminates the need for the pipe itself to rotate, adapting to the inspection requirements of large-diameter, heavy-weight pipes and improving its versatility. Simultaneously, the cleaning mechanism, in conjunction with the suction effect of the receiving box, effectively removes interfering debris from the inspection area, preventing dust and debris from interfering with image acquisition, reducing the false detection and false negative rates of coating defect identification, and solving the technical problems of limited applicability and susceptibility to impurities in traditional devices, thus ensuring the accuracy and reliability of coating inspection.

Description

Technical Field

[0001] This invention relates to the field of optical inspection technology for spray coating, and more specifically to an inspection device for spray coating. Background Technology

[0002] Pipeline infrastructure is increasingly used in many fields, such as marine seawater pipelines and petrochemical pipelines. Corrosive flowing media constantly pass through these pipelines, making the inner walls susceptible to corrosion. This corrosion and leakage can lead to pipeline failure, resulting in significant economic losses and even serious safety accidents. Traditionally, pipeline inner walls lack extensive protection. However, with increasing demands for pipeline lifespan and performance, applying protective coatings to the inner walls has become crucial for pipeline maintenance. This effectively extends pipeline lifespan and improves safety and reliability.

[0003] After the pipeline is coated, the coating needs to be inspected to detect defects, flaws, or stains. Currently, the industry generally uses a combination of image acquisition and intelligent analysis to inspect the quality of the inner wall coating of pipelines. This involves acquiring high-definition image data of the inner wall coating of the pipeline through inspection equipment, and then using image recognition algorithms to preprocess, extract features, and compare and analyze defects in the acquired images. This enables the automatic identification and judgment of various defects such as pinholes, bubbles, scratches, missed coatings, and impurities. For example, patent CN214334707U discloses a coating surface inspection device for pipeline anti-corrosion coating spraying, which includes an inspection cylinder with an annular rotating track around the inner wall of the inspection cylinder. A coating surface detector is installed on the rotating track. At least one lighting lamp is also installed inside the inspection cylinder. A transmission mechanism is installed on each side of the inspection cylinder, and the transmission mechanism is located below the horizontal plane where the center line of the inspection cylinder is located. The coating inspection device for anti-corrosion coating spraying of pipelines in this embodiment performs inspections by simply rotating the inspection cylinder to fix the pipeline to be inspected. Compared with the traditional inspection method that rotates the pipeline while the detector remains stationary, it saves more energy. At the same time, since the pipeline to be inspected remains stationary during inspection and the detector moves on a fixed track, the final inspection accuracy is higher.

[0004] However, such coating inspection devices still have significant limitations in practical applications: on the one hand, the inspection process requires the rotation of the pipeline, which is difficult to apply to large-diameter and heavy pipelines, and problems such as difficulty in rotation and unstable positioning are likely to occur, resulting in insufficient equipment versatility; on the other hand, dust and debris remaining on the inner wall of the pipeline can interfere with the detection signal, leading to problems such as obstruction of the detection optical path, uneven image brightness, loss of edge details, and artifact interference, which seriously reduces the clarity and signal-to-noise ratio of image acquisition, affects the accuracy of image acquisition, directly affects the accuracy of coating defect identification, and is prone to false detection or missed detection. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a spray coating inspection device, comprising: A movable frame is slidably installed inside the pipe along its length. An eccentric shaft is rotatably mounted on the movable frame, and the eccentric shaft is eccentrically positioned inside the pipe. The drive mechanism drives the movable frame to slide and rotates the eccentric shaft. An abutment box, one end of which is open; An elastic telescopic component, one end of which is mounted on the eccentric rotating shaft and the other end of which is mounted on the abutment box, so that one end of the opening of the abutment box slides against the inner wall of the pipe, and the elastic telescopic component draws air into the abutment box during the telescopic process; A cleaning mechanism, installed within the receiving box, is used to clean the inner wall of the pipe; and A camera is mounted outside the abutment box to capture image data of the coating inside the pipe.

[0006] Preferably, the elastic telescopic component includes: a housing, a piston, a connecting pipe, a first one-way valve, a second one-way valve, a third one-way valve, and a fourth one-way valve; one end of the housing is mounted on the eccentric rotating shaft; the piston is slidably mounted inside the housing to divide the housing into a first cavity near the eccentric rotating shaft and a second cavity away from the eccentric rotating shaft; the first cavity discharges air unidirectionally to the outside through the first one-way valve, and the second cavity discharges air unidirectionally to the outside through the second one-way valve; one end of the connecting pipe slides through the housing and is mounted on the piston after passing through the housing away from the eccentric rotating shaft; the other end of the connecting pipe is mounted inside the abutment box and communicates with the interior of the abutment box; a third one-way valve is installed on the connecting pipe to connect the connecting pipe and the first cavity, so that the connecting pipe discharges air unidirectionally towards the first cavity; a fourth one-way valve is installed on the connecting pipe to connect the connecting pipe and the second cavity, so that the connecting pipe discharges air unidirectionally towards the second cavity.

[0007] Preferably, the cleaning mechanism is a cleaning brush, one end of which is installed inside the receiving box, and the other end of which extends outside the receiving box through the opening of the receiving box.

[0008] Preferably, the movable frame includes: a bidirectional lead screw, a nut seat, a lower support plate, an upper support plate, a lower clamping plate, an upper clamping plate, and rollers; the bidirectional lead screw is coaxially and rotatably connected to the eccentric rotating shaft, and a nut seat is provided at each end of the bidirectional lead screw, with the two nut seats threadedly connected to the bidirectional lead screw; two lower support plates are provided below each nut seat, and one upper support plate is provided below each nut seat; the upper support plate and the lower support plate have different lengths; one end of the upper support plate and the lower support plate are hinged to the nut seat, and the upper support plate and the lower support plate are hinged to the nut seat. The axis of the screw is perpendicular to the axis of the bidirectional lead screw; the two lower support plates are symmetrically arranged with the upper support plate as a reference plane; the ends of the two upper support plates away from the nut seat are hinged to the upper clamping plate; one of the lower support plates on the two nut seats forms a group, and each group of lower support plates is arranged in correspondence with the lower clamping plate, and the end of the lower support plate away from the nut seat is hinged to the corresponding lower clamping plate; multiple rollers are rotatably installed on the side of the lower clamping plate and the upper clamping plate near the pipe; the axes of the multiple rollers are perpendicular to the axis of the bidirectional lead screw.

[0009] Preferably, the movable frame further includes a turntable, which is coaxially fixed to the end of the bidirectional lead screw away from the eccentric shaft.

[0010] Preferably, a rubber pad is fitted on the outer side of the roller.

[0011] Preferably, the driving mechanism includes: a rotating shaft, a friction drive wheel, a first bevel gear set, a splined shaft, a bushing, a second bevel gear set, and a driving assembly; the rotating shaft is rotatably mounted on the movable frame, and the rotating shaft and the moving direction of the movable frame are perpendicular to each other; the friction drive wheel is coaxially fixed with the rotating shaft to abut against the inner wall of the pipe; the first bevel gear set is mounted on the movable frame; one bevel gear of the first bevel gear set rotates synchronously with the rotating shaft, and the other bevel gear of the first bevel gear set is coaxially fixed with one end of the splined shaft, and the other end of the splined shaft is slidably inserted into the bushing through a spline; one bevel gear of the second bevel gear set is coaxially fixed with the bushing, and the other bevel gear set of the second bevel gear set is coaxially fixed with the eccentric rotating shaft; the driving assembly drives the movable frame to move.

[0012] Preferably, one of the bevel gears in the first bevel gear set rotates synchronously with the shaft via a sprocket and a chain.

[0013] Preferably, the drive assembly includes a traction rope and a reel; one end of the traction rope is mounted on the movable frame, and the other end of the traction rope is mounted on the reel.

[0014] Compared with the prior art, the present invention has at least the following advantages: 1. In this invention, there is no need for the pipe to rotate itself, which is suitable for the testing needs of large-diameter and heavy pipes, improving the versatility of the equipment. At the same time, the cleaning mechanism, together with the suction effect of the contact box, effectively removes interfering debris in the testing area, avoids dust and debris from interfering with image acquisition, reduces the false detection rate and false negative rate of coating defect identification, solves the technical problems of limited applicability and easy interference of impurities in traditional devices, and ensures the accuracy and reliability of coating detection.

[0015] 2. In this invention, the reciprocating sliding of the piston and the coordinated operation of four one-way valves achieve the linkage control of the movement of the elastic telescopic component and the negative pressure extraction of the receiving box. There is no need to add an additional negative pressure generating device, which simplifies the device structure. At the same time, the continuous and stable negative pressure can quickly suck the cleaned dust, foreign objects and other impurities into the receiving box, avoiding the overflow of impurities and contamination of the detection lens, and ensuring the accuracy of the spraying detection. The bidirectional one-way exhaust design avoids the reverse flow of external gas from affecting the negative pressure effect, and improves the working stability of the elastic telescopic component and the impurity collection efficiency.

[0016] 3. In this invention, the movable frame directly achieves the eccentric arrangement of the eccentric rotating shaft by utilizing the length difference between the upper and lower support plates, eliminating the need for additional eccentric adjustment structures and simplifying the overall structural design of the device. Simultaneously, the synchronous reverse movement of the nut seat is achieved through the threaded transmission of the bidirectional screw, which, in conjunction with the swing linkage of the support plate, drives the rollers to complete the adaptive clamping of the inner walls of pipes with different diameters. This allows the device to meet the testing requirements of various pipe specifications without the need to replace adaptable parts, significantly improving the versatility and adaptability of the device. The rolling support form of the rollers effectively reduces the frictional resistance between the movable frame and the inner wall of the pipe when sliding, ensuring the stability and flexibility of the movable frame's movement within the pipe.

[0017] 4. In this invention, the drive mechanism does not require additional independent drive components. Power transmission is achieved by using the friction between the friction drive wheel and the inner wall of the pipe. The structure is compact and has strong linkage. The cooperation between the spline shaft and the bushing not only solves the problem of adapting to pipes of different diameters, but also compensates for the axial displacement during the movement of the moving frame, avoids transmission jamming, and ensures accurate transmission of rotational power. This ensures a smooth and efficient detection process, further improving the detection accuracy and the versatility of the device.

[0018] 5. In this invention, the reel rotates to wind up or release the traction rope, and the traction rope pulls the moving frame to move smoothly along the length of the pipeline; the drive component adopts a structure in which the traction rope and the reel cooperate, which is simple and reliable in transmission, convenient in operation, and can flexibly control the moving speed and stroke of the moving frame to adapt to the inspection requirements of pipelines of different lengths. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 This is a front view schematic diagram of a spraying inspection device provided in an embodiment of the present invention.

[0021] Figure 2 This is a side view schematic diagram of a spraying inspection device provided in an embodiment of the present invention.

[0022] Figure 3 This is a three-dimensional schematic diagram of a spraying inspection device provided in an embodiment of the present invention.

[0023] Figure 4 This is a partial structural schematic diagram of the driving mechanism provided in an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the structure of the elastic telescopic member provided in an embodiment of the present invention.

[0025] Reference numerals: 1. Moving frame; 11. Two-way lead screw; 12. Nut seat; 13. Lower support plate; 14. Upper support plate; 15. Lower clamping plate; 16. Upper clamping plate; 17. Roller; 18. Turntable; 19. Rubber pad; 2. Drive mechanism; 21. Rotating shaft; 22. Friction drive wheel; 23. First bevel gear set; 24. Splined shaft; 25. Bushing; 26. Second bevel gear set; 27. Traction rope; 3. Elastic telescopic component; 31. Box body; 32. Piston; 33. Connecting pipe; 34. First one-way valve; 35. Second one-way valve; 36. Third one-way valve; 37. Fourth one-way valve; 38. First cavity; 39. Second cavity; 4. Eccentric rotating shaft; 5. Abutment box; 6. Camera; 7. Cleaning brush; 8. Sprocket; 9. Chain. Detailed Implementation

[0026] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0027] In this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] See Figures 1-5 The present invention provides an embodiment of a spray coating inspection device, comprising: a movable frame 1, a drive mechanism 2, an elastic telescopic member 3, an eccentric rotating shaft 4, an abutment box 5, a camera 6, and a cleaning mechanism; the movable frame 1 is slidably installed inside the pipe along its length; the eccentric rotating shaft 4 is rotatably installed on the movable frame 1 and is eccentrically positioned inside the pipe; the drive mechanism 2 drives the movable frame 1 to slide and rotates the eccentric rotating shaft 4; one end of the abutment box 5 is open; one end of the elastic telescopic member 3 is installed on the eccentric rotating shaft 4, and the other end of the elastic telescopic member 3 is installed on the abutment box 5, so that the open end of the abutment box 5 slides against the inner wall of the pipe, and the elastic telescopic member 3 draws air into the abutment box 5 during the telescopic process; the cleaning mechanism is installed inside the abutment box 5 to clean the inner wall of the pipe; the camera 6 is installed outside the abutment box 5 to collect image data of the coating on the inner side of the pipe.

[0030] In specific implementation, the drive mechanism 2 drives the movable frame 1 to slide along the length of the pipe, while simultaneously driving the eccentric shaft 4 to rotate on the movable frame 1. The eccentric shaft 4 is eccentrically positioned inside the pipe and drives the elastic telescopic component 3, the abutment box 5, and the camera 6 to perform circular motion synchronously. The elastic telescopic component 3 slides one end of the opening of the abutment box 5 against the inner wall of the pipe, creating a negative pressure suction force during the telescopic process. The cleaning mechanism cleans the inner wall of the pipe inside the abutment box 5, removing dust and debris. The camera 6 simultaneously collects image data of the coating on the inner side of the pipe, performs preprocessing operations such as noise reduction, enhancement, and grayscale conversion on the collected image data, extracts the defect feature information of the coating surface, and compares and analyzes the preprocessed image data with a preset standard image. The comparison results identify and determine whether the coating has defects such as pinholes, missed coatings, bubbles, and impurities, thereby achieving automated detection and judgment of the coating quality on the inner wall of the pipeline. Subsequently, the linear motion of the moving frame 1 and the rotational motion of the eccentric rotating shaft 4 work together to achieve full-area scanning and detection of the coating on the inner wall of the pipeline without blind spots. This process does not require the pipeline to rotate itself, adapting to the detection needs of large-diameter and heavy pipelines and improving the versatility of the equipment. At the same time, the cleaning mechanism, together with the suction action of the contact box 5, effectively removes interfering debris in the detection area, avoiding interference from dust and debris on image acquisition, reducing the false detection rate and false negative rate of coating defect identification, solving the technical problems of limited applicability and easy interference of impurities in traditional devices, and ensuring the accuracy and reliability of coating detection.

[0031] See Figures 1-5 In other embodiments, the elastic telescopic member 3 includes: a housing 31, a piston 32, a connecting pipe 33, a first one-way valve 34, a second one-way valve 35, a third one-way valve 36, and a fourth one-way valve 37; one end of the housing 31 is mounted on the eccentric shaft 4; the piston 32 is slidably mounted inside the housing 31 to divide the housing 31 into a first cavity 38 near the eccentric shaft 4 and a second cavity 39 away from the eccentric shaft 4; the first cavity 38 vents air unidirectionally to the outside through the first one-way valve 34, and the second cavity 39 vents air unidirectionally to the outside through the second one-way valve 35. One-way exhaust; one end of the connecting pipe 33 slides through the housing 31 away from the eccentric shaft 4 and is installed on the piston 32; the other end of the connecting pipe 33 is installed in the abutment box 5 and communicates with the inside of the abutment box 5; a third one-way valve 36 is installed on the connecting pipe 33 to connect the connecting pipe 33 and the first cavity 38, so that the connecting pipe 33 exhausts air unidirectionally toward the first cavity 38; a fourth one-way valve 37 is installed on the connecting pipe 33 to connect the connecting pipe 33 and the second cavity 39, so that the connecting pipe 33 exhausts air unidirectionally toward the second cavity 39.

[0032] In practice, the eccentric shaft 4 rotates eccentrically, causing the elastic telescopic component 3 to move synchronously. The piston 32 slides back and forth within the housing 31, dividing the inner cavity of the housing 31 into a first cavity 38 and a second cavity 39. When the piston 32 moves closer to the eccentric shaft 4, the volume of the first cavity 38 decreases, creating positive pressure. The first one-way valve 34 opens to release gas outward in one direction. Simultaneously, the volume of the second cavity 39 increases, creating negative pressure. The fourth one-way valve 37 opens, allowing gas in the connecting pipe 33 to flow unidirectionally into the second cavity 39. The connecting pipe 33 simultaneously draws gas from the contact box 5, creating a negative pressure environment within the contact box 5. When the piston 32 moves away from the eccentric shaft 4, the volume of the second cavity 39 decreases, creating positive pressure. The second one-way valve 35 opens to release gas outward in one direction. Simultaneously, the volume of the first cavity... The increased volume of chamber 38 creates negative pressure, and the third one-way valve 36 opens, allowing gas in the connecting pipe 33 to flow unidirectionally into the first chamber 38. The connecting pipe 33 then draws gas from the receiving box 5 again, maintaining the negative pressure state within the receiving box 5. This process, through the reciprocating sliding of the piston 32 and the coordinated operation of the four one-way valves, achieves the linkage control between the movement of the elastic telescopic component 3 and the negative pressure extraction of the receiving box 5. No additional negative pressure generating device is required, simplifying the device structure. At the same time, the continuous and stable negative pressure can quickly draw the cleaned dust, foreign objects, and other impurities into the receiving box 5, preventing impurities from overflowing and contaminating the detection lens, ensuring the accuracy of the spraying detection. The bidirectional one-way exhaust design prevents external gas from flowing back and affecting the negative pressure effect, improving the working stability of the elastic telescopic component 3 and the impurity collection efficiency.

[0033] See Figures 1-5 In other embodiments, the cleaning mechanism is a cleaning brush 7. One end of the cleaning brush 7 is installed inside the receiving box 5, and the other end of the cleaning brush 7 extends outside the receiving box 5 through the opening of the receiving box 5. The cleaning brush 7 moves with the receiving box 5 and adheres to the inner wall of the pipe. The end of the cleaning brush 7 exposed outside the opening of the receiving box 5 directly contacts the inner wall of the pipe. During the reciprocating movement of the receiving box 5 driven by the elastic telescopic member 3, the cleaning brush 7 scrapes and cleans the dust, foreign objects and other impurities attached to the inner wall of the pipe, thereby achieving rapid cleaning of impurities.

[0034] See Figures 1-5In other embodiments, the movable frame 1 includes: a bidirectional lead screw 11, a nut seat 12, a lower support plate 13, an upper support plate 14, a lower clamping plate 15, an upper clamping plate 16, and rollers 17; the bidirectional lead screw 11 is coaxially and rotatably connected to the eccentric rotating shaft 4, and nut seats 12 are respectively provided at both ends of the bidirectional lead screw 11, and the two nut seats 12 are threadedly connected to the bidirectional lead screw 11; two lower support plates 13 are provided below each nut seat 12, and one upper support plate 14 is provided below each nut seat 12; the upper support plate 14 and the lower support plate 13 have different lengths; one end of the upper support plate 14 and the lower support plate 13 is hinged to the nut seat 12, and the upper support plate 14 and the lower support plate 15 are hinged to the nut seat 16. The axis of the hinge between the support plate 13 and the nut seat 12 is perpendicular to the axis of the double-acting screw 11; the two lower support plates 13 are symmetrically arranged with the upper support plate 14 as a reference plane; the ends of the two upper support plates 14 away from the nut seat 12 are hinged to the upper clamping plate 16; one of the lower support plates 13 on the two nut seats 12 forms a group, and each group of lower support plates 13 is corresponding to a lower clamping plate 15, and the end of the lower support plate 13 away from the nut seat 12 is hinged to the corresponding lower clamping plate 15; multiple rollers 17 are rotatably installed on the side of the lower support plate 13 and the upper clamping plate 16 near the pipe; the axes of the multiple rollers 17 are perpendicular to the axis of the double-acting screw 11.

[0035] In practice, the bidirectional lead screw 11 rotates and drives the nut seat 12, which is threaded at both ends, to move towards or away from each other along its axis. When the nut seat 12 moves, it drives the upper support plate 14, which is hinged to it, and the two symmetrically arranged lower support plates 13 to swing synchronously. This pushes the upper clamping plate 16, which is hinged to the end of the upper support plate 14, and the lower clamping plates 15, which are correspondingly hinged to the two sets of lower support plates 13, to move towards the inner wall of the pipe synchronously, so as to abut against the inner wall of the pipe through the roller 17. Because the upper support plate 14 and the lower support plate 13 have different lengths, the eccentric shaft 4, which is rotatably connected to the bidirectional lead screw 11 on the same axis, is eccentrically arranged inside the pipe.

[0036] After the roller 17 is stably in contact with the inner wall of the pipe, it ensures the smooth sliding of the moving frame 1 along the length of the pipe and also limits the radial movement of the moving frame 1 to prevent it from shifting or shaking inside the pipe. During this process, the moving frame 1 directly achieves the eccentric arrangement of the eccentric shaft 4 by utilizing the length difference between the upper and lower support plates 13, without the need for additional eccentric adjustment structures, simplifying the overall structural design of the device. At the same time, the synchronous reverse movement of the nut seat 12 is achieved through the threaded transmission of the bidirectional screw 11, which, together with the swing linkage of the support plate, drives the roller 17 to complete the adaptive clamping of the inner wall of pipes with different diameters. It can meet the testing requirements of various pipe specifications without the need to replace the adapter parts, greatly improving the versatility and adaptability of the device. The rolling support form of the roller 17 effectively reduces the frictional resistance between the moving frame 1 and the inner wall of the pipe when sliding, ensuring the stability and flexibility of the moving frame 1 in the pipe.

[0037] Furthermore, the mobile frame 1 also includes a turntable 18, which is coaxially fixed to the end of the bidirectional lead screw 11 away from the eccentric shaft 4. The turntable 18 provides a convenient force application point for the rotation operation of the bidirectional lead screw 11. The operator can easily control the rotation direction and rotation angle of the bidirectional lead screw 11 by rotating the turntable 18, thereby accurately adjusting the movement stroke of the nut seat 12 and realizing flexible control over the opening and closing range of the upper clamping plate 16 and the lower clamping plate 15. The mobile frame 1 can be quickly adapted to pipes of different diameters without the need for additional auxiliary tools, which greatly improves the convenience of operation and adjustment efficiency of the device.

[0038] Furthermore, a rubber pad 19 is fitted on the outer side of the roller 17; the rubber pad 19 fitted on the outer side of the roller 17 comes into contact with the inner wall of the pipe simultaneously with the roller 17, and the elastic properties of the rubber material enable the roller 17 to make flexible contact with the inner wall of the pipe, avoiding the direct friction of the hard roller 17 to cause scratch damage to the inner wall of the pipe; at the same time, the anti-slip texture of the rubber pad 19 can increase the contact friction between the roller 17 and the inner wall of the pipe, effectively preventing the moving frame 1 from slipping or shifting during sliding or testing, ensuring the support stability and positional accuracy of the moving frame 1 in the pipe, and better adapting to the curved surface of the inner side of the pipe.

[0039] See Figures 1-5In other embodiments, the drive mechanism 2 includes: a rotating shaft 21, a friction drive wheel 22, a first bevel gear set 23, a splined shaft 24, a bushing 25, a second bevel gear set 26, and a drive assembly; the rotating shaft 21 is rotatably mounted on the movable frame 1, and the moving directions of the rotating shaft 21 and the movable frame 1 are perpendicular to each other; the friction drive wheel 22 is coaxially fixed with the rotating shaft 21 to abut against the inner wall of the pipe; the first bevel gear set 23 is mounted on the movable frame 1; one bevel gear of the first bevel gear set 23 rotates synchronously with the rotating shaft 21, and the other bevel gear of the first bevel gear set 23 is coaxially fixed with one end of the splined shaft 24, and the other end of the splined shaft 24 is slidably inserted into the bushing 25 through a spline; one bevel gear of the second bevel gear set 26 is coaxially fixed with the bushing 25, and the other bevel gear set of the second bevel gear set 26 is coaxially fixed with the eccentric rotating shaft 4; the drive assembly drives the movable frame 1 to move.

[0040] In practice, the drive assembly drives the movable frame 1 to move along the length of the pipe. During the movement of the movable frame 1, the friction drive wheel 22 abuts against the inner wall of the pipe and rotates under the action of friction. The friction drive wheel 22 drives the rotating shaft 21, which is fixed coaxially with it, to rotate synchronously. The rotating shaft 21 transmits the rotational power to the splined shaft 24 through the first bevel gear set 23, so that the splined shaft 24 rotates synchronously. The splined shaft 24 and the bushing 25 adopt a spline sliding fit, which can achieve flexible axial extension and retraction according to the change of pipe diameter and the adjustment of the position of the movable frame 1, adapting to the inspection requirements of pipes with different diameters, while ensuring stable power transmission. The splined shaft 24 transmits the rotational power to the pipe. The shaft is passed to the bushing 25, which drives the eccentric shaft 4 to rotate synchronously through the second bevel gear set 26, realizing the synchronous linkage between the linear movement of the moving frame 1 and the rotational movement of the eccentric shaft 4. This drive mechanism 2 does not require additional independent drive components. It achieves power transmission by means of the friction between the friction drive wheel 22 and the inner wall of the pipe. It has a compact structure and strong linkage. The cooperation between the spline shaft 24 and the bushing 25 not only solves the problem of adapting to pipes of different diameters, but also compensates for the axial displacement of the moving frame 1 during the movement process, avoids transmission jamming, and ensures accurate transmission of rotational power, ensuring a smooth and efficient detection process, and further improving the detection accuracy and the versatility of the device.

[0041] Furthermore, one of the bevel gears in the first bevel gear set 23 rotates synchronously with the shaft 21 via a sprocket 8 and a chain 9; this sprocket 8 and chain 9 transmission structure enables long-distance, slippage-free synchronous power transmission between the shaft 21 and the first bevel gear set 23. Furthermore, the shaft 21 and one of the bevel gears in the first bevel gear set 23 can also be connected via belt drive.

[0042] See Figures 1-5In another embodiment, the drive assembly includes a traction rope 27 and a reel; one end of the traction rope 27 is mounted on the movable frame 1, and the other end of the traction rope 27 is mounted on the reel; the reel rotates to wind up or release the traction rope 27, and the traction rope 27 pulls the movable frame 1 to move smoothly along the length of the pipeline; the drive assembly adopts a structure in which the traction rope 27 and the reel cooperate, which is simple and reliable in transmission, convenient in operation, and can flexibly control the moving speed and stroke of the movable frame 1 to adapt to the inspection requirements of pipelines of different lengths.

[0043] In summary, this invention significantly improves the operational convenience and equipment versatility of pipeline inner wall coating inspection through the synergistic cooperation of multiple technical means, including the aforementioned adaptive support structure, the linkage negative pressure cleaning mechanism, and the drive mechanism 2 that combines the friction drive wheel 22 with the spline shaft 24 and bushing 25. It can quickly adapt to pipeline inspection operations of different diameters and lengths. Simultaneously, the dual cleaning action of the cleaning brush 7 and the negative pressure adsorption of the abutment box 5 effectively eliminates the interference of dust and debris on the image acquisition of the camera 6, significantly improving the clarity and completeness of the image data acquired by the camera 6. Based on the high-quality image data acquired, through noise reduction, enhancement, feature extraction, and comparative analysis with standard templates, accurate identification and judgment of coating defects are achieved. This comprehensively improves the efficiency and accuracy of pipeline inner wall coating inspection, ensuring stable and reliable inspection results and providing strong support for the quality control of pipeline anti-corrosion coatings.

[0044] 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A spray coating testing device, characterized in that, include: A movable frame is slidably installed inside the pipe along its length. An eccentric shaft is rotatably mounted on the movable frame, and the eccentric shaft is eccentrically positioned inside the pipe. The drive mechanism drives the movable frame to slide and rotates the eccentric shaft. An abutment box, one end of which is open; An elastic telescopic component, one end of which is mounted on the eccentric rotating shaft and the other end of which is mounted on the abutment box, so that one end of the opening of the abutment box slides against the inner wall of the pipe, and the elastic telescopic component draws air into the abutment box during the telescopic process; A cleaning mechanism, installed inside the receiving box, is used to clean the inner wall of the pipe; and A camera is mounted outside the abutment box to capture image data of the coating inside the pipe.

2. The spray coating testing equipment according to claim 1, characterized in that, The elastic telescopic component includes: a housing, a piston, a connecting pipe, a first one-way valve, a second one-way valve, a third one-way valve, and a fourth one-way valve; one end of the housing is mounted on the eccentric rotating shaft; the piston is slidably mounted inside the housing to divide the housing into a first cavity near the eccentric rotating shaft and a second cavity away from the eccentric rotating shaft; the first cavity discharges air unidirectionally to the outside through the first one-way valve, and the second cavity discharges air unidirectionally to the outside through the second one-way valve; one end of the connecting pipe slides through the housing and is mounted on the piston after passing through the housing away from the eccentric rotating shaft; the other end of the connecting pipe is mounted inside the abutment box and communicates with the interior of the abutment box; a third one-way valve is installed on the connecting pipe to connect the connecting pipe and the first cavity, so that the connecting pipe discharges air unidirectionally towards the first cavity; a fourth one-way valve is installed on the connecting pipe to connect the connecting pipe and the second cavity, so that the connecting pipe discharges air unidirectionally towards the second cavity.

3. The spray coating testing equipment according to claim 1, characterized in that, The cleaning mechanism is a cleaning brush, one end of which is installed inside the receiving box, and the other end of which extends outside the receiving box through the opening of the receiving box.

4. The spray coating testing equipment according to claim 1, characterized in that, The movable frame includes: a bidirectional lead screw, a nut seat, a lower support plate, an upper support plate, a lower clamping plate, an upper clamping plate, and rollers; the bidirectional lead screw is coaxially and rotatably connected to the eccentric rotating shaft, and a nut seat is provided at each end of the bidirectional lead screw, with the two nut seats threadedly connected to the bidirectional lead screw; two lower support plates are provided below each nut seat, and one upper support plate is provided below each nut seat; the upper and lower support plates have different lengths; one end of the upper and lower support plates is hinged to the nut seat, and the axis of hinge between the upper and lower support plates and the nut seat is... The line is perpendicular to the axis of the bidirectional lead screw; the two lower support plates are symmetrically arranged with the upper support plate as a reference plane; the ends of the two upper support plates away from the nut seat are hinged to the upper clamping plate; one of the lower support plates on the two nut seats forms a group, and each group of lower support plates is arranged in correspondence with the lower clamping plate, and the end of the lower support plate away from the nut seat is hinged to the corresponding lower clamping plate; multiple rollers are rotatably installed on the side of the lower clamping plate and the upper clamping plate near the pipe; the axes of the multiple rollers are perpendicular to the axis of the bidirectional lead screw.

5. The spray coating testing equipment according to claim 4, characterized in that, The movable frame further includes a turntable, which is coaxially fixed to the end of the bidirectional lead screw away from the eccentric shaft.

6. The spray coating testing equipment according to claim 4, characterized in that, A rubber pad is fitted on the outside of the roller.

7. The spray coating testing equipment according to claim 1, characterized in that, The driving mechanism includes: a rotating shaft, a friction drive wheel, a first bevel gear set, a splined shaft, a bushing, a second bevel gear set, and a driving assembly; the rotating shaft is rotatably mounted on the movable frame, and the rotating shaft and the moving direction of the movable frame are perpendicular to each other; the friction drive wheel is coaxially fixed with the rotating shaft to abut against the inner wall of the pipe; the first bevel gear set is mounted on the movable frame; one bevel gear of the first bevel gear set rotates synchronously with the rotating shaft, and the other bevel gear of the first bevel gear set is coaxially fixed with one end of the splined shaft, and the other end of the splined shaft is slidably inserted into the bushing through a spline; one bevel gear of the second bevel gear set is coaxially fixed with the bushing, and the other bevel gear set of the second bevel gear set is coaxially fixed with the eccentric rotating shaft; the driving assembly drives the movable frame to move.

8. The spray coating testing equipment according to claim 7, characterized in that, One of the bevel gears in the first bevel gear set rotates synchronously with the shaft via a sprocket and a chain.

9. A spray coating testing device according to claim 7, characterized in that, The drive assembly includes a traction rope and a reel; one end of the traction rope is mounted on the mobile frame, and the other end of the traction rope is mounted on the reel.

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