Visual detection device and detection method for conveyor belt defects

Abstract

The invention belongs to the technical field of visual inspection, and particularly relates to a conveyor belt defect visual inspection device and method. The conveyor belt defect visual inspection device comprises a bedplate, a rack, a traction mechanism, a visual mechanism and a stretching mechanism; a pair of racks is arranged, and the tops of the racks are fixedly connected with a track beam; a pair of sliding blocks is connected into the track beam in a sliding mode. A spring is arranged between the sliding block and the track beam; a hydraulic cylinder is fixedly connected to the surface of the rack; and a connecting rod is hinged between the output end of the hydraulic cylinder and the pair of sliding blocks. The hydraulic cylinders push the sliding blocks to slide towards the two sides along the track beam through the connecting rods, the distance between the pair of supporting rollers is gradually increased, the conveying belt is stretched and deformed in the length direction of the conveying belt, the conveying belt is in a tensioned state, the real tensioning working condition of the conveying belt in the using process is fully simulated, potential defects on the surface of the conveying belt are more obviously exposed, and the conveying belt is more stable in performance. Particularly, tiny cracks, wrinkles or delamination and the like can be conveniently and accurately detected and identified by a follow-up visual mechanism.

Description

Technical Field

[0001] This invention belongs to the field of visual inspection technology, specifically a visual inspection device and method for conveyor belt defects. Background Technology

[0002] As a key component for continuous material transport in modern industrial production, the quality and reliability of conveyor belts directly affect the safety and stable operation of the entire production system. After the production line is manufactured, the conveyor belt's rubber cover, fabric, or steel cord core may have initial defects such as surface cracks, scratches, bubbles, delamination, or damage to the internal skeleton due to process fluctuations or material factors. If these potential defects are not detected and addressed in time, they will be amplified rapidly during subsequent high-load, long-term actual operation, easily leading to serious failures such as premature wear, sudden tearing, or even breakage of the conveyor belt. This will not only cause production interruptions and significant economic losses but may also endanger the safety of on-site personnel. Therefore, conducting rigorous and comprehensive quality inspection of the conveyor belt at the end of the production process is an indispensable and important step to ensure its qualified performance upon leaving the factory, eliminate safety hazards, and guarantee its service life.

[0003] Chinese patent application CN119780111A discloses a method for measuring the fatigue of conveyor belts. The key technical points are: utilizing a high-resolution camera combined with advanced image processing technology to achieve non-contact real-time monitoring of the conveyor belt surface condition and automatically identify potential problem areas; using a high-resolution camera to capture images of 0.1mm cracks on the conveyor belt surface during normal operation, ensuring clear imaging at high belt speeds of 7m / s; achieving a 20mm field of view and a minimum pixel size of 0.01mm; simultaneously performing automatic analysis of the collected data, achieving automatic calculation of 5000 lines of data per second, and implementing end-side calculation; employing a threshold-based crack detection algorithm to automatically calculate information such as crack width, length, and distribution density in the images, and classifying the aging degree of the conveyor belt according to GB / T11206-2009 "Surface Cracking Method for Rubber Aging Tests" based on the calculated information.

[0004] However, the above-mentioned technologies often have the following drawbacks: Existing conveyor belt defect detection devices can usually only perform passive static observation of conveyor belts in a naturally relaxed state. It is difficult to apply a controllable active stretching effect during detection, which makes it difficult to fully expose potential defects on the surface of the conveyor belt, such as micro-cracks, wrinkles or delamination. Moreover, its imaging is unstable and easily interfered with, and it cannot simulate real working stress to detect hidden dangers in advance, thus seriously affecting the reliability, accuracy and predictability of visual inspection.

[0005] Therefore, the present invention provides a visual inspection device and method for conveyor belt defects. 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 the present invention to solve its technical problem is: a visual inspection device for defects in conveyor belts, comprising a platform, a frame, a traction mechanism, a vision mechanism and a tensioning mechanism;

[0008] The frame is provided with a pair of track beams fixedly connected to its top;

[0009] The traction mechanism is located on the top of the platform and is used to control the conveyor belt to move to one side;

[0010] The vision mechanism is positioned between a pair of track beams and is used to detect defects in the conveyor belt using visual technology.

[0011] The stretching mechanism is disposed between a pair of track beams and is used to stretch and deform the conveyor belt; the stretching mechanism includes a support roller, a pressure roller, a slider, and a hydraulic cylinder;

[0012] The support roller and the pressing roller are each provided in a pair, with the pressing roller located above the support roller; a pair of sliders are slidably connected inside the track beam; both ends of the support roller are rotatably connected to the sliders respectively; a spring is provided between the slider and the track beam; a hydraulic cylinder is fixedly connected to the surface of the frame; a connecting rod is hinged between the output end of the hydraulic cylinder and the pair of sliders.

[0013] Preferably, a mounting plate is fixedly connected to the side of the slider; an electric cylinder is fixedly connected to the surface of the mounting plate; a lifting block is fixedly connected to the output end of the electric cylinder; and the pressing roller is fixedly connected between a pair of lifting blocks.

[0014] Preferably, the vision mechanism is provided in pairs and is located on both sides of the conveyor belt.

[0015] Preferably, the vision mechanism includes a movable base and a pair of mounting brackets; a screw is rotatably connected between the mounting brackets; the screw is driven by a motor, and the screw passes through the movable base and is connected to it through a lead screw and nut pair; a vision sensor is provided on the lower side of the movable base.

[0016] Preferably, an electric cylinder two is fixedly connected to the upper side of the movable seat; a lifting ring plate is provided on the outer side of the vision sensor; a connecting frame is fixedly connected between the output end of the electric cylinder two and the lifting ring plate; a marking ring is fixedly connected to the lower side of the lifting ring plate; the marking ring is made of water-absorbing material and has liquid dye adsorbed inside.

[0017] Preferably, a dye box is fixedly connected between the movable seat and the vision sensor; a fixing ring is provided below the dye box; a set of fabric tubes are evenly distributed between the fixing ring and the dye box; a piston rod is slidably sealed inside the fabric tube, and the piston rod is fixedly connected to the lifting ring plate; the fabric tube and the dye box are connected through a guide hole one; a guide hole two is opened inside the piston rod; a one-way valve is provided inside both the guide hole one and the guide hole two.

[0018] Preferably, the marking ring has an elastic ring inside; the elastic ring has a wavy design.

[0019] Preferably, each trough of the elastic ring away from the lifting ring plate is fixedly connected to a guide rod; the guide rod passes through the marking ring and the lifting ring plate and slides with them.

[0020] A visual inspection method for conveyor belt defects, using the aforementioned visual inspection device for conveyor belt defects, includes the following steps:

[0021] S1. Pass the conveyor belt through the stretching mechanism and the traction mechanism so that the conveyor belt is located between the support roller and the clamping roller. Control the electric cylinder to retract to cause the clamping roller to move down and clamp the conveyor belt.

[0022] S2. Control the hydraulic cylinder to extend upwards, and push the slider to slide along the track beam to both sides through the connecting rod. The distance between a pair of support rollers gradually increases, stretching and deforming the conveyor belt along its length.

[0023] S3. The screw is driven by a motor to rotate, controlling the moving seat to move smoothly between the mounting frames. A vision sensor is used to continuously scan and detect the entire width of the conveyor belt.

[0024] S4. When a defect is detected on the surface of the conveyor belt, the connecting frame and the lifting ring plate are moved down by the electric cylinder two, so that the marking ring approaches and contacts the surface of the conveyor belt, and the liquid dye is applied to the defective area.

[0025] S5. The lifting ring plate drives the piston rod to slide down synchronously inside the fabric cylinder, creating a negative pressure inside the fabric cylinder and drawing the dye from the dye box into the fabric cylinder through the guide hole.

[0026] S6. After marking is completed, the electric cylinder two drives the lifting ring plate to move up and reset, and the piston rod slides up accordingly, squeezing the dye inside the fabric cylinder through the guide hole two into the marking ring, realizing the automatic replenishment of adsorbed dye.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. The present invention discloses a visual inspection device and method for conveyor belt defects. A hydraulic cylinder is controlled to extend upwards, and a connecting rod pushes a slider to slide along the track beam to both sides. A spring is compressed by the slider, and the distance between a pair of support rollers gradually increases, thereby stretching and deforming the conveyor belt along its length, bringing it to a tensioned state. This stretching action fully simulates the actual tensioning conditions of the conveyor belt during use, making potential defects on the conveyor belt surface more clearly exposed, especially micro-cracks, wrinkles, or delamination, etc., facilitating accurate detection and identification by the subsequent vision mechanism. Furthermore, after stretching, the conveyor belt surface becomes more stable, less prone to shaking or swaying, and the distance between it and the vision sensor is easier to control, providing a stable imaging basis and preventing problems such as image blurring, laser line distortion, and difficulty in feature extraction.

[0029] 2. The visual inspection device and method for conveyor belt defects described in this invention utilizes a motor-driven screw rotation mechanism. Due to the precise screw-nut pair fit between the screw and the movable seat, the screw can efficiently and smoothly propel the movable seat between the mounting frames during motor operation. This enables the visual sensor to continuously scan the entire width of the conveyor belt, effectively expanding the inspection range and ensuring comprehensive, blind-spot-free inspection of the conveyor belt surface. This significantly reduces blind spots caused by fixed-position inspections, improving the accuracy and reliability of the inspection.

[0030] 3. The visual inspection device and method for conveyor belt defects described in this invention, when the system identifies a defect on the surface of the conveyor belt through a visual sensor, the motor immediately stops running, the electric cylinder 2 starts and retracts downward, and the lifting ring plate moves down synchronously through the connecting frame. As the lifting ring plate descends, the marking ring on its lower side gradually approaches and contacts the surface of the conveyor belt. Then, the liquid dye adsorbed inside the marking ring is transferred to the surface of the conveyor belt under pressure, clearly marking the defect area. This structure can intuitively mark the location of the defect at the first moment of detection, making it convenient for subsequent staff to quickly locate the defect and improve the response efficiency of defect handling. Attached Figure Description

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] Figure 1 This is a perspective view of the present invention;

[0033] Figure 2 This is a schematic diagram of the vision mechanism and the stretching mechanism in this invention;

[0034] Figure 3 This is a schematic diagram of the support roller structure in this invention;

[0035] Figure 4 This is a schematic diagram of the movable base in this invention;

[0036] Figure 5 yes Figure 4 Enlarged view of a portion of point A in the middle;

[0037] Figure 6 This is a schematic diagram of the structure of the movable base and dye box in this invention;

[0038] Figure 7 This is a schematic diagram showing the disassembly of the marking ring in this invention;

[0039] Figure 8 This is a side view of the movable seat in this invention;

[0040] Figure 9 yes Figure 8 Enlarged view of a section at point B in the middle;

[0041] Figure 10 This is a schematic diagram of the method flow of the present invention.

[0042] In the diagram: 1. Platform; 2. Frame; 3. Track beam; 4. Conveyor belt; 5. Support roller; 6. Pressing roller; 7. Slider; 8. Hydraulic cylinder; 9. Spring; 10. Connecting rod; 11. Mounting plate; 12. Electric cylinder one; 13. Lifting block; 14. Moving seat; 15. Mounting frame; 16. Screw; 17. Motor; 18. Vision sensor; 19. Electric cylinder two; 20. Lifting ring plate; 21. Connecting frame; 22. Marking ring; 23. Dye box; 24. Fixing ring; 25. Fabric cylinder; 26. Piston rod; 27. Guide hole one; 28. Guide hole two; 29. ​​Elastic ring; 30. Guide rod. Detailed Implementation

[0043] 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.

[0044] like Figures 1 to 9 As shown, the visual inspection device for conveyor belt defects of the present invention includes a platform 1, a frame 2, a traction mechanism, a vision mechanism and a tensioning mechanism;

[0045] The frame 2 is provided with a pair of track beams 3, and the top of the frame is fixedly connected to the track beams 3.

[0046] The traction mechanism is located on the top of the platform 1 and is used to control the conveyor belt 4 to move to one side;

[0047] The vision mechanism is positioned between a pair of track beams 3 and is used to detect defects in the conveyor belt 4 using visual technology.

[0048] The stretching mechanism is disposed between a pair of track beams 3 and is used to stretch and deform the conveyor belt 4; the stretching mechanism includes a support roller 5, a pressure roller 6, a slider 7, and a hydraulic cylinder 8;

[0049] The support roller 5 and the pressing roller 6 are each provided in a pair, and the pressing roller 6 is located above the support roller 5; a pair of sliders 7 are slidably connected inside the track beam 3; both ends of the support roller 5 are rotatably connected to the sliders 7 respectively; a spring 9 is provided between the sliders 7 and the track beam 3; a hydraulic cylinder 8 is fixedly connected to the surface of the frame 2; a connecting rod 10 is hinged between the output end of the hydraulic cylinder 8 and the pair of sliders 7.

[0050] Existing conveyor belt 4 defect detection devices can usually only perform passive static observation of the conveyor belt 4 in a naturally relaxed state. It is difficult to apply a controllable active stretching effect during detection, which makes it difficult to fully expose potential defects on the surface of the conveyor belt 4, such as micro-cracks, wrinkles or delamination. In addition, its imaging is unstable and easily interfered with, and it cannot simulate real working stress to detect hidden dangers in advance, thus seriously affecting the reliability, accuracy and predictability of visual inspection.

[0051] In this invention, the conveyor belt 4 is passed through the stretching mechanism and the traction mechanism, so that the conveyor belt 4 is located between the support roller 5 and the pressure roller 6. Then, the hydraulic cylinder 8 is controlled to extend upward, and the slider 7 is pushed to slide to both sides along the track beam 3 through the connecting rod 10. The spring 9 is compressed by the slider 7, and the distance between the pair of support rollers 5 gradually increases, thereby stretching and deforming the conveyor belt 4 along its length, so that it is in a taut state. This stretching action can fully simulate the real tension condition of the conveyor belt 4 during use, making the potential defects on the surface of the conveyor belt 4 more obvious, especially micro cracks, wrinkles or delamination, etc., which is convenient for subsequent vision mechanisms to accurately detect and identify. Moreover, after the conveyor belt 4 is stretched, its surface is more stable and less prone to shaking or swaying. The distance between it and the vision sensor 18 is easier to control, providing a stable imaging basis and preventing problems such as image blurring, laser line distortion, and difficulty in feature extraction.

[0052] The visual mechanism detects potential defects on the surface of the conveyor belt 4, then controls the hydraulic cylinder 8 to retract downwards, causing the sliders 7 to move closer together and reset. This gradually reduces the distance between the pair of support rollers 5, thus loosening the conveyor belt 4. The traction mechanism then moves the conveyor belt 4 forward a certain distance to stretch and inspect the next section. By repeating the above operations, the quality of the conveyor belt 4 can be inspected section by section.

[0053] The slider 7 is fixedly connected to the side of the mounting plate 11; the mounting plate 11 is fixedly connected to the surface of the electric cylinder 12; the output end of the electric cylinder 12 is fixedly connected to the lifting block 13; the pressing roller 6 is fixedly connected between a pair of lifting blocks 13.

[0054] The lifting block 13 can be driven to move vertically up and down by setting the electric cylinder 12. When the electric cylinder 12 is in the extended state, there is a gap between the pressure roller 6 and the conveyor belt 4, which makes it easy for the traction mechanism to control the movement of the conveyor belt 4. When the electric cylinder 12 is in the shortened state, the pressure roller 6 and the support roller 5 can clamp the conveyor belt 4, which facilitates the lateral stretching action and further improves the stability of the conveyor belt 4 in the tensioned state, providing more reliable detection conditions for visual inspection. In addition, the lifting structure is also conducive to adapting to different thicknesses of the conveyor belt 4, avoiding the problem of insufficient clamping force or excessive compression caused by the difference in thickness of the conveyor belt 4.

[0055] In one embodiment of the present invention, a pair of vision mechanisms are provided and located on both sides of the conveyor belt 4 respectively.

[0056] When the conveyor belt 4 is in a tensioned state, the cameras on both sides can simultaneously capture images of the upper and lower surfaces of the conveyor belt 4, and transmit the real-time image data to the background processing system. The system extracts and analyzes the defect features through a preset image recognition algorithm, and can accurately identify common defect types such as cracks, bulges, scratches and impurities embedded on the surface of the conveyor belt 4.

[0057] In one embodiment of the present invention, the vision mechanism includes a movable base 14 and a pair of mounting brackets 15, and the mounting brackets 15 are fixedly connected to the track beam 3; a screw 16 is rotatably connected between the mounting brackets 15; the screw 16 is driven by a motor 17, and the screw 16 passes through the movable base 14 and is connected to it through a lead screw and nut pair; a vision sensor 18 is provided on the lower side of the movable base 14; a guide rod 30 is also fixedly connected between the mounting brackets 15, and the movable base 14 is slidably connected to the guide rod 30.

[0058] The screw 16 is driven to rotate by the motor 17. Since the screw 16 and the moving seat 14 adopt a precision screw and nut pair structure, when the motor 17 is running, the screw 16 can efficiently and smoothly push the moving seat 14 to move between the mounting brackets 15. This enables the vision sensor 18 to continuously scan the entire width of the conveyor belt 4, effectively expanding the detection range and ensuring full coverage detection of the surface of the conveyor belt 4 without dead angles. This significantly reduces the blind spot problem caused by fixed position detection and improves the accuracy and reliability of detection.

[0059] In one embodiment of the present invention, an electric cylinder 19 is fixedly connected to the upper side of the movable seat 14; a lifting ring plate 20 is provided on the outer side of the vision sensor 18; a connecting frame 21 is fixedly connected between the output end of the electric cylinder 19 and the lifting ring plate 20; a marking ring 22 is fixedly connected to the lower side of the lifting ring plate 20; the marking ring 22 is made of water-absorbing material (such as sponge, cotton fiber, etc.) and has liquid dye adsorbed inside.

[0060] When the system detects a defect on the surface of the conveyor belt 4 through the vision sensor 18, the motor 17 will immediately stop running, the electric cylinder 19 will start and retract downwards, and the lifting ring plate 20 will move down synchronously through the connecting frame 21. As the lifting ring plate 20 descends, the marking ring 22 on its lower side will gradually approach and contact the surface of the conveyor belt 4. Then, the liquid dye adsorbed inside the marking ring 22 will be transferred to the surface of the conveyor belt 4 under pressure, clearly marking the defect. This structure can intuitively mark the location of the defect as soon as it is detected, which makes it convenient for subsequent staff to quickly locate the defect and improve the response efficiency of defect handling.

[0061] A dye box 23 is fixedly connected between the movable base 14 and the vision sensor 18; a fixing ring 24 is provided below the dye box 23; a set of fabric tubes 25 are evenly distributed between the fixing ring 24 and the dye box 23; a piston rod 26 is slidably sealed inside the fabric tube 25, and the piston rod 26 is fixedly connected to the lifting ring plate 20; the fabric tube 25 and the dye box 23 are connected through a guide hole 27; a guide hole 28 is provided inside the piston rod 26; a one-way valve is provided inside both the guide hole 27 and the guide hole 28.

[0062] When the electric cylinder 219 moves the lifting ring plate 20 downward to perform the marking operation, the lifting ring plate 20 will simultaneously move the piston rod 26 downward within the fabric cylinder 25. At this time, the internal space of the fabric cylinder 25 increases due to the downward movement of the piston rod 26, forming a negative pressure. The liquid dye in the dye box 23 will then push open the one-way valve in the guide hole 27 and enter the fabric cylinder 25 through the guide hole 27. When the marking is completed, the electric cylinder 219 moves the lifting ring plate 20 upward to reset, and the piston rod 26 slides upward accordingly. The internal pressure of the fabric cylinder 25 increases, and the one-way valve in the guide hole 28 opens at this time. The dye inside the fabric cylinder 25 is then transported to the marking ring 22 through the guide hole 28, realizing the automatic replenishment of the dye adsorbed in the marking ring 22. This ensures that there is a sufficient supply of dye for each marking operation, avoiding the problem of unclear marking due to insufficient dye, thereby ensuring the continuity and stability of the entire defect marking process.

[0063] In one embodiment of the present invention, an elastic ring 29 is provided inside the marking ring 22; the elastic ring 29 has a wave-like design. This wave-like elastic ring 29 serves as the skeleton structure of the marking ring 22, and can store a certain amount of elastic potential energy when the marking ring 22 is compressed. After the marking operation is completed, the elastic ring 29 can use its own elasticity to drive the marking ring 22 to quickly return to its original shape, improving the resilience of the marking ring 22 and preventing it from gradually flattening after long-term compression.

[0064] Each trough of the elastic ring 29 away from the lifting ring plate 20 is fixedly connected to a guide rod 30; the guide rod 30 passes through the marking ring 22 and the lifting ring plate 20 and slides with them.

[0065] When the marking ring 22 approaches and is pressed against the surface to be marked under the drive of the electric cylinder 29, the part of the guide rod 30 that passes through the lifting ring plate 20 can provide a stable guiding effect for the deformation of the marking ring 22, so as to prevent the marking ring 22 from being deflected or tilted due to uneven force during the contact process and thus being damaged. When the marking operation is completed, when the lifting ring plate 20 moves upward to the fixed ring 24, the guide rod 30 will be squeezed by the fixed ring 24, causing the guide rod 30 to move downward relative to the lifting ring plate 20 and the marking ring 22, thereby driving the various troughs of the elastic ring 29 to move downward, causing the elastic ring 29 and the marking ring 22 to expand and deform downward as a whole, so that the marking ring 22 is in a fluffy state and its internal pores are increased. At this time, the dye injected into the marking ring 22 through the guide hole 28 can be quickly transported and spread inside it, improving the uniformity of dye absorption by the marking ring 22.

[0066] like Figure 10 As shown, the present invention provides a visual inspection method for conveyor belt defects, which uses the aforementioned visual inspection device for conveyor belt defects and includes the following steps:

[0067] S1. Pass the conveyor belt 4 through the stretching mechanism and the traction mechanism so that the conveyor belt 4 is located between the support roller 5 and the pressing roller 6. Control the electric cylinder 12 to retract, causing the pressing roller 6 to move down and clamp the conveyor belt 4.

[0068] S2. Control the hydraulic cylinder 8 to extend upwards, and push the slider 7 to slide along the track beam 3 to both sides through the connecting rod 10. The distance between a pair of support rollers 5 gradually increases, stretching and deforming the conveyor belt 4 along its length.

[0069] S3. The screw 16 is rotated by the motor 17, and the moving seat 14 is controlled to move smoothly between the mounting frames 15. The vision sensor 18 is used to continuously scan and detect the entire width of the conveyor belt 4.

[0070] S4. When a defect is detected on the surface of the conveyor belt 4, the connecting frame 21 and the lifting ring plate 20 are moved down by the electric cylinder 2 19, so that the marking ring 22 approaches and contacts the surface of the conveyor belt 4, and the liquid dye is applied to the defective area.

[0071] S5. The lifting ring plate 20 drives the piston rod 26 to slide downward synchronously inside the fabric cylinder 25, forming a negative pressure inside the fabric cylinder 25 and drawing the dye in the dye box 23 into the fabric cylinder 25 through the guide hole 27.

[0072] S6. After marking is completed, the electric cylinder 19 drives the lifting ring plate 20 to move up and reset, and the piston rod 26 slides up accordingly, squeezing the dye inside the cloth cylinder 25 through the guide hole 28 into the marking ring 22, realizing the automatic replenishment of adsorbed dye.

[0073] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0074] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not 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 limiting the scope of protection of this invention.

[0075] 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 visual inspection device for defects in conveyor belts, characterized in that: Includes a platform (1), a frame (2), a traction mechanism, a vision mechanism, and a tensioning mechanism; The frame (2) is provided with a pair of track beams (3) fixedly connected to its top; The traction mechanism is located on the top of the platform (1) and is used to control the conveyor belt (4) to move to one side; The vision mechanism is positioned between a pair of track beams (3) and is used to detect defects in the conveyor belt (4) using visual technology; The stretching mechanism is disposed between a pair of track beams (3) and is used to stretch and deform the conveyor belt (4); the stretching mechanism includes a support roller (5), a pressure roller (6), a slider (7) and a hydraulic cylinder (8); The support roller (5) and the pressing roller (6) are each provided in a pair, and the pressing roller (6) is located above the support roller (5); a pair of sliders (7) are slidably connected inside the track beam (3); the two ends of the support roller (5) are respectively rotatably connected to the sliders (7); a spring (9) is provided between the sliders (7) and the track beam (3); a hydraulic cylinder (8) is fixedly connected to the surface of the frame (2); a connecting rod (10) is hinged between the output end of the hydraulic cylinder (8) and the pair of sliders (7).

2. The visual inspection device for conveyor belt defects according to claim 1, characterized in that: The slider (7) is fixedly connected to the side of the mounting plate (11); the mounting plate (11) is fixedly connected to the surface of the electric cylinder (12); the output end of the electric cylinder (12) is fixedly connected to the lifting block (13); the pressing roller (6) is fixedly connected between a pair of lifting blocks (13).

3. The visual inspection device for conveyor belt defects according to claim 1, characterized in that: The vision mechanism is provided in pairs and is located on both sides of the conveyor belt (4).

4. The visual inspection device for conveyor belt defects according to claim 1, characterized in that: The vision mechanism includes a movable base (14) and a pair of mounting brackets (15); a screw (16) is rotatably connected between the mounting brackets (15); the screw (16) is driven by a motor (17), and the screw (16) passes through the movable base (14) and is connected to it through a lead screw and nut pair; a vision sensor (18) is provided on the lower side of the movable base (14).

5. The visual inspection device for conveyor belt defects according to claim 4, characterized in that: The upper side of the movable seat (14) is fixedly connected to the electric cylinder two (19); the outer side of the vision sensor (18) is provided with a lifting ring plate (20); the output end of the electric cylinder two (19) is fixedly connected to the lifting ring plate (20) with a connecting frame (21); the lower side of the lifting ring plate (20) is fixedly connected to a marking ring (22); the marking ring (22) is made of water-absorbing material and has liquid dye adsorbed inside.

6. The visual inspection device for conveyor belt defects according to claim 5, characterized in that: A dye box (23) is fixedly connected between the movable seat (14) and the vision sensor (18); a fixing ring (24) is provided below the dye box (23); a set of fabric tubes (25) are evenly distributed between the fixing ring (24) and the dye box (23); a piston rod (26) is slidably sealed inside the fabric tube (25), and the piston rod (26) is fixedly connected to the lifting ring plate (20); the fabric tube (25) and the dye box (23) are connected through a guide hole one (27); a guide hole two (28) is opened inside the piston rod (26); a one-way valve is provided inside both the guide hole one (27) and the guide hole two (28).

7. A visual inspection device for conveyor belt defects according to claim 6, characterized in that: The marking ring (22) has an elastic ring (29) inside; the elastic ring (29) has a wave-shaped design.

8. A visual inspection device for conveyor belt defects according to claim 7, characterized in that: The elastic ring (29) is fixedly connected to guide rods (30) at each trough away from the lifting ring plate (20); the guide rods (30) pass through the marking ring (22) and the lifting ring plate (20) and slide with them.

9. A method for visual inspection of defects in conveyor belts, wherein the method employs the visual inspection device for conveyor belt defects as described in any one of claims 1-8, characterized in that: Includes the following steps: S1. Pass the conveyor belt (4) through the stretching mechanism and the traction mechanism so that the conveyor belt (4) is located between the support roller (5) and the clamping roller (6). Control the electric cylinder (12) to contract, causing the clamping roller (6) to move down and clamp the conveyor belt (4). S2. Control the hydraulic cylinder (8) to extend upwards, and push the slider (7) to slide along the track beam (3) to both sides through the connecting rod (10). The distance between a pair of support rollers (5) gradually increases, stretching and deforming the conveyor belt (4) along its length. S3. The screw (16) is driven to rotate by the motor (17), and the moving seat (14) is controlled to move smoothly between the mounting frame (15). The vision sensor (18) continuously scans and detects the entire width of the conveyor belt (4).

10. A visual inspection method for conveyor belt defects according to claim 9, characterized in that: It also includes the following steps: S4. When a defect is detected on the surface of the conveyor belt (4), the connecting frame (21) and the lifting ring plate (20) are moved down by the electric cylinder (19), and the marking ring (22) approaches and contacts the surface of the conveyor belt (4) to apply liquid dye to the defective area. S5. The lifting ring plate (20) drives the piston rod (26) to slide down synchronously inside the fabric cylinder (25). A negative pressure is formed inside the fabric cylinder (25) and the dye in the dye box (23) is sucked into the fabric cylinder (25) through the guide hole (27). S6. After marking is completed, the electric cylinder two (19) drives the lifting ring plate (20) to move up and reset, and the piston rod (26) slides up to squeeze the dye inside the cloth cylinder (25) through the guide hole two (28) into the marking ring (22) to realize the automatic replenishment of adsorbed dye.

Images