A roll surface defect detection device with material tension overload autonomous protection function and a method thereof

Abstract

The application provides a coiled material surface defect detection equipment with material tension overload autonomous protection function and a method thereof, and belongs to the technical field of coiled material surface quality detection. The equipment solves the problems of the existing coiled material defect detection equipment, such as material conveying vibration slip interference imaging, forced tensioning damage to the coiled material, insufficient online real-time marking capacity, and the need to stop the machine and cut the material during maintenance and debugging. The equipment comprises an equipment base, a detection carrier roller assembly, a pressure sensor, a code sprayer, a rotary encoder, a side-turning opening and closing rack, a visual detection component and a control system. Two compression roller assemblies constitute an adaptive tensioning mechanism, and the gravity compression roller is combined with a pressure sensor, an electric control damping mechanism, a limiting mechanism and a contact sensor to control the realization of flexible tension adjustment and automatic protection, synchronous vibration suppression and coiled material damage avoidance; the code sprayer sprays a mark while detecting the coiled material defects. The side-turning opening and closing rack is adopted, the coiled material is fully through without cutting, and the material integrity is ensured.

Description

Technical Field

[0001] This invention belongs to the field of surface quality inspection technology for rolled materials, and in particular relates to a surface defect detection device and method for rolled materials with self-protection function against material tension overload. Background Technology

[0002] During continuous high-speed conveying and inspection of rolled materials, surface defects such as pinholes, scratches, wrinkles, dirt spots, and bubbles are easily generated. Currently, the mainstream approach is machine vision inspection, which uses a high-precision line scan camera to scan the surface of the moving rolled material in real time, combined with specialized detection algorithms to achieve end-to-end online quality control. However, existing rolled material surface defect detection equipment still has the following shortcomings: (1) In the production of roll materials, the roller groups of the production equipment are arranged in parallel. Due to the unstable operation of the motor of the winding mechanism, the vibration of the reduction gear, and the uneven output of the extrusion mechanism, the roll material is prone to uneven speed when it travels on the roller surface, causing the material to bounce up and down and shake. This will be directly transmitted to the visual shooting area, causing the industrial camera to capture blurry images, edge ghosting, and texture distortion. Meanwhile, the line scan camera uses line-by-line scanning. In order to obtain an image that is proportional to the material, it is necessary to obtain the displacement speed of the material being detected. The usual method is to use a rotary encoder to contact the idler roller. When the material is conveyed, it contacts the idler roller and rubs against it, causing it to rotate and then transmit the angular velocity signal to the rotary encoder, so that the material displacement speed can be calculated. However, the material bounces and shakes, causing it to lose contact with the idler roller. The friction force cannot be transmitted, resulting in a deviation in the displacement speed calculation.

[0003] The above situations are prone to false detection, missed detection, and image shift when processing distorted images. Furthermore, the shift will cause deviation in the calculation of defect coordinates, resulting in positioning errors for subsequent accurate defect marking.

[0004] (2) Existing roll tensioning mechanisms generally adopt active pressure modes such as spring pressing, cylinder or motor, etc. The tension force is a preset fixed value and cannot be adaptively adjusted according to the thickness of the roll, the hardness of the material, and the running speed. When the tension setting is too large, ultra-thin films and soft materials are easily squeezed and stretched, resulting in tensile deformation, indentation and damage; when the tension setting is too small, the loose wrinkles of the roll cannot be eliminated, making it difficult to meet the needs of stable conveying of rolls of different specifications.

[0005] (3) Existing roll material visual inspection equipment only completes defect capture and background storage and archiving, and can only manually review the defect location afterward. It lacks the function of real-time marking during inspection. (4) The existing roll material visual inspection equipment adopts a closed inspection frame. When deploying, repairing and adjusting, the roll material must be cut and re-threaded, which greatly reduces the continuous operation efficiency of the production line and affects the overall production cycle. Summary of the Invention

[0006] In view of this, in order to solve the problems of existing roll material defect detection equipment, such as material conveying vibration and slippage interfering with imaging, forced tension easily damaging the roll material, insufficient online real-time marking capability, and the need to stop the machine to cut materials for maintenance and debugging, this invention proposes a roll material surface defect detection equipment and method with material tension overload self-protection function.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A surface defect detection device for rolled materials with self-protection function against material tension overload includes: Equipment base; The detection roller assembly includes a bracket, multiple unpowered rollers rotatably mounted on the bracket, and two pressure roller assemblies. The multiple unpowered rollers are arranged in parallel and spaced intervals. The bracket is fixed to the equipment base. The pressure roller assemblies include a cantilever mechanism, a gravity pressure roller, an electrically controlled damping mechanism, a limit mechanism, and a contact sensor. The gravity pressure roller is rotatably mounted at one end of the cantilever mechanism, and the other end of the cantilever mechanism is rotatably mounted on the bracket. The unpowered roller located between the two gravity pressure rollers is the central roller, and there are at least two central rollers. The area between the two central rollers is the detection area. The electrically controlled damping mechanism is installed at the pivot connecting the cantilever mechanism and the bracket, and is used to apply controllable resistance to the rotation of the cantilever mechanism. The limit mechanism is fixedly mounted on the bracket, and the contact sensor is mounted on the limit mechanism. The limit mechanism is located below the cantilever mechanism. Pressure sensor used to detect the pressure of the roll material on the central idler roller; The inkjet printer, located below the inspection area, is used to mark rolls with surface defects; A rotary encoder is used to detect the displacement speed of a roll material, and to calculate the marking timing of the inkjet printer when a defect is detected on the surface of the roll material. A side-tilting frame is located above the equipment base, with one side of the side-tilting frame rotatably connected to the equipment base. The visual inspection assembly, including multiple cameras and light sources, is mounted on a side-flipping hinged frame; The control system is electrically connected to pressure sensors, contact sensors, electronically controlled damping mechanisms, inkjet printers, rotary encoders, and vision inspection components.

[0008] As a preferred embodiment of the above-mentioned roll material surface defect detection equipment with material tension overload self-protection function, a locking mechanism is provided on the other side of the side-flipping opening and closing frame. The locking mechanism is used to lock or unlock the side-flipping opening and closing frame and the equipment base.

[0009] As a preferred embodiment of the above-mentioned roll material surface defect detection equipment with material tension overload self-protection function, the equipment base is equipped with an equipment cabinet, and the control system is set inside the equipment cabinet.

[0010] As a preferred embodiment of the aforementioned roll material surface defect detection equipment with self-protection function against material tension overload, the equipment base is equipped with a cabinet door.

[0011] As a preferred embodiment of the above-mentioned roll material surface defect detection equipment with self-protection function against material tension overload, a telescopic keyboard holder is provided on one side of the equipment base.

[0012] As a preferred embodiment of the above-mentioned roll material surface defect detection equipment with material tension overload self-protection function, the side-flipping opening and closing frame is also equipped with a display, which is electrically connected to the control system, and the display and the telescopic keyboard frame are located on the same side.

[0013] As a preferred embodiment of the above-mentioned roll material surface defect detection equipment with material tension overload self-protection function, the multiple cameras include a side camera and a vertical camera. The vertical camera is mounted on the top crossbeam of the side-flipping frame via a sliding bracket, the side camera is mounted on the side crossbeam of one side of the side-flipping frame via an adjustable bracket, and the light source is mounted on the side crossbeam of the other side of the side-flipping frame.

[0014] As a preferred embodiment of the above-mentioned roll material surface defect detection equipment with self-protection function against material tension overload, the side-tilting opening and closing frame is made of aluminum profile.

[0015] This invention also provides a method for detecting surface defects in rolled materials with an autonomous protection function against material tension overload, employing the aforementioned equipment for detecting surface defects in rolled materials with an autonomous protection function against material tension overload, comprising: Open the side-tilting frame and lay the roll material flat on the unpowered idler roller; Close and lock the side-opening frame; Adjust the limiting mechanism so that the cantilever mechanism contacts the limiting mechanism. When the contact sensor is triggered, the downward pressure of the gravity roller on the material can keep the material in an ideal tension state in the detection area. At this time, the control system increases the resistance to the rotation of the cantilever mechanism through the electronic damping mechanism, so that the gravity roller remains in this position. Start the roll material production line, and the vision inspection component collects images of the roll material surface in real time and transmits the image data to the control system. The control system identifies defects on the surface of the roll material in real time. When a defect is detected on the surface of the roll material, the system calculates the location of the defect based on the signal from the rotary encoder and controls the inkjet printer to mark it under the roll material.

[0016] As a preferred embodiment of the above-mentioned method for detecting surface defects of rolled materials with self-protection function against material tension overload, when the tension force on the material is overloaded and the pressure value detected by the pressure sensor exceeds the preset threshold, the control system reduces the voltage of the electronically controlled damping mechanism to release the resistance of the cantilever mechanism rotation, and the gravity pressure roller is lifted under the action of the material tension force to release the tension force. When the tension force on the material returns to the normal value or falls below the overload value, the gravity roller presses down due to its own weight. When the contact sensor is triggered, the control system increases the voltage of the electronically controlled damping mechanism to increase the resistance to the rotation of the cantilever mechanism, so that the gravity roller maintains this position so that the material is in the ideal tension state.

[0017] Compared with existing technologies, the beneficial effects of the roll material surface defect detection device and method with material tension overload self-protection function provided by the present invention are: This invention provides a surface defect detection device and method for rolled materials with autonomous protection against material tension overload. In this device, a gravity roller is positioned at the corresponding location for visual imaging. The weight of the gravity roller and an electronically controlled damping mechanism constrain the vertical movement of the rolled material, eliminating image blurring and ghosting distortion caused by roller conveyor vibration. Simultaneously, it allows the material to fit more closely to the unpowered roller, preventing slippage and encoder signal loss. This reduces the false detection rate of defect image recognition and significantly improves the imaging quality and reliability of visual inspection.

[0018] This roll material surface defect detection equipment, which features autonomous protection against material tension overload, abandons the active pressure mode of springs, cylinders, and motors. Instead, it uses gravity pressure rollers combined with an electronically controlled damping mechanism, pressure sensor, limit mechanism, and contact sensor to automatically adjust the tension, preventing excessive tension from stretching, damaging ultra-thin films, and soft materials. It has a wider range of applications and effectively prevents material damage and stretching.

[0019] This roll material surface defect detection equipment features autonomous protection against material tension overload. An inkjet printer is installed below the detection area. After detecting a surface defect, a rotary encoder calculates the marking timing and controls the inkjet printer to mark the material. Production personnel can then easily identify the defect location via the marking. This integrated defect identification and marking system overcomes the challenge of real-time online marking in similar industry equipment. The marking points are located adjacent to the detection points, with short travel distances and minimal delay control errors, enabling marking to be triggered immediately upon defect identification and judgment, facilitating subsequent review and traceability.

[0020] Compared to traditional enclosed inspection frames that require cutting the roll material and stopping the machine for adjustment, cleaning, and maintenance, this roll material surface defect inspection equipment with self-protection against material tension overload uses a side-flipping opening and closing frame that can be directly opened to the side, allowing the roll material to pass through without cutting, effectively ensuring the integrity of the material during roll material production. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of a roll material surface defect detection device with material tension overload self-protection function provided in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the detection roller assembly of the roll material surface defect detection equipment with material tension overload self-protection function provided in a specific embodiment of the present invention; Figure 3 This is a schematic diagram from a first perspective of the surface defect detection device for roll materials with self-protection function against material tension overload provided in a specific embodiment of the present invention. Figure 4 This is a schematic diagram of a roll material surface defect detection device with material tension overload self-protection function provided in a specific embodiment of the present invention from a second perspective. Figure 5 This is a schematic diagram of the side-tilting opening and closing frame of the roll material surface defect detection equipment with material tension overload self-protection function provided in a specific embodiment of the present invention in the open state; Figure 6 This is a schematic diagram of a roll material surface defect detection device with material tension overload self-protection function and a roll material provided in a specific embodiment of the present invention.

[0022] In the picture: 1. Side-folding frame; 11. Side-facing camera; 12. Vertical camera; 13. Light source; 14. Monitor; 2. Inspection roller assembly; 21. Non-powered roller; 22. Gravity pressure roller; 23. Cantilever mechanism; 24. Inkjet printer; 25. Limiting mechanism; 26. Rotary encoder; 27. Pressure sensor; 28. Contact sensor; 29. ​​Electrically controlled damping mechanism; 3. Equipment base; 31. Equipment cabinet; 32. Telescopic keyboard rack; 33. Spindle mechanism; 4. Locking mechanism. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0024] To address the problems of existing roll material defect detection equipment, such as material conveying vibration and slippage interfering with imaging, forced tension easily damaging the roll material, insufficient online real-time marking capability, and the need for shutdown and material cutting for maintenance and debugging, this invention provides a roll material surface defect detection device and method with an autonomous protection function against material tension overload. Two pressure roller assemblies constitute an adaptive tensioning mechanism. Through the gravity pressure roller in the vision scanning area, combined with pressure sensors, electronically controlled damping mechanisms, limit mechanisms, and contact sensors, flexible tension adjustment and automatic protection are achieved, simultaneously suppressing vibration and avoiding damage to the roll material. The inkjet printer prints marks while detecting roll material defects. The upper side-flipping frame allows for camera adjustment, cleaning, maintenance, and fault diagnosis without cutting the roll material. Through the matching vision inspection program and hardware, closed-loop control of image acquisition, defect judgment, position calculation, and delayed inkjet printing is completed, effectively improving imaging stability, detection accuracy, defect tracing, and the convenience of production line operation and maintenance.

[0025] This surface defect detection equipment for roll materials with autonomous protection against material tension overload is mainly used for surface defect identification, location and real-time marking in the continuous production process of plastic film strip roll materials. It is suitable for online quality inspection, defect tracing and hierarchical control in industrial roll material automated production lines.

[0026] See Figure 1-6This embodiment specifically describes a roll material surface defect detection device with self-protection function against material tension overload, which includes: a base 3, a detection roller assembly 2, a pressure sensor 27, an inkjet printer 24, a rotary encoder 26, a side-flipping frame 1, a vision inspection component, and a control system. The detection roller assembly 2 includes a bracket, multiple unpowered rollers 21 rotatably mounted on the bracket, and two pressure roller assemblies. The multiple unpowered rollers 21 are arranged in parallel and spaced apart. The bracket is fixed to the equipment base 3. The pressure roller assemblies include a cantilever mechanism 23, a gravity pressure roller 22, an electrically controlled damping mechanism 29, a limiting mechanism 25, and a contact sensor 28. The gravity pressure roller 22 is rotatably mounted on one end of the cantilever mechanism 23, and the other end of the cantilever mechanism 23 is rotatably mounted on the bracket. The unpowered roller 21 located between the two gravity pressure rollers 22 is the central roller, and there are at least two central rollers. The area between the two central rollers is the detection area. The electrically controlled damping mechanism 29 is installed at the pivot connecting the cantilever mechanism 23 and the bracket, and is used to apply controllable resistance to the rotation of the cantilever mechanism 23. The limiting mechanism 25 is fixedly mounted on the bracket, and the contact sensor 28 is used to apply controllable resistance to the rotation of the cantilever mechanism 23. Sensor 28 is mounted on limiting mechanism 25, which is located below cantilever mechanism 23; pressure sensor 27 is used to detect the pressure of the roll material on the central idler roller; inkjet printer 24 is located below the detection area and is used to mark roll material with surface defects; rotary encoder 26 is used to detect the displacement speed of the roll material, and when a defect is detected on the surface of the roll material, the rotary encoder 26 calculates the marking timing of inkjet printer 24; side-flipping opening and closing frame 1 is located above equipment base 3, and one side of side-flipping opening and closing frame 1 is rotatably connected to equipment base 3; vision inspection component includes multiple cameras and light sources 13, all mounted on side-flipping opening and closing frame 1; control system is electrically connected to pressure sensor 27, contact sensor 28, electrically controlled damping mechanism 29, inkjet printer 24, rotary encoder 26 and vision inspection component.

[0027] In this roll material surface defect detection equipment with self-protection function against material tension overload, the detection roller assembly 2 is equipped with two sets of gravity pressure rollers 22 that press down on the left and right sides of the roll material respectively, so that the roll material forms a taut and flat state in the detection area supported by the central roller. The cantilever mechanism 23 corresponding to the two sets of gravity pressure rollers 22 is equipped with a limiting mechanism 25 below it to limit the maximum downward stroke of the gravity pressure roller 22. When the equipment is operating, the electronically controlled damping mechanism 29 will provide a certain resistance to the cantilever mechanism 23 to ensure that the downward pressure of the gravity pressure roller 22 is stable and not too small, thereby maintaining a good tension state of the material in the detection area. A contact sensor 28 is installed on the side of the limiting mechanism 25. When the cantilever mechanism 23 contacts the contact sensor 28, the contact sensor 28 will be activated and an electrical signal will be obtained. In the preparation stage before use, the lower cantilever mechanism 23 and the limiting mechanism 25 are in the contact position.

[0028] When the traction force is too high during the conveying process of the roll material production line, the tensioning force of the tensioning mechanism will also increase, potentially causing damage to the roll material. In this case, the protection principle of the roll material surface defect detection equipment with material tension overload self-protection function is as follows: Before detection, the limiting mechanism 25 is adjusted so that when the cantilever mechanism 23 contacts the limiting mechanism 25, i.e., when the contact sensor 28 is triggered, the downward pressure of the gravity roller 22 on the material can maintain the material in an ideal tension state in the detection area. At this time, the control system increases the resistance to the rotation of the cantilever mechanism 23 through the electronically controlled damping mechanism 29, so that the gravity roller 22 maintains this position. By adjusting the initial position of the gravity roller 22 to be in the ideal position, the material can be in an ideal tension state.

[0029] When the tension of the roll material is overloaded, the pressure of the roll material on the central idler roller will also increase. When the pressure value of the pressure sensor 27 exceeds the preset threshold of the control system, the control system will reduce the voltage of the electronically controlled damping mechanism 29 and release the resistance of the rotating shaft connecting the cantilever mechanism 23 and the bracket. As a result, the gravity pressure roller 22 will be lifted by the tension of the material, releasing a certain tension and achieving the effect of protecting the roll material.

[0030] When the traction force transmitted in the roll production line decreases, the tension force also decreases. When the tension force on the material returns to the normal value or is below the overload value, the gravity roller 22 will descend under its own gravity. When the cantilever mechanism 23 contacts the limit mechanism 25, it triggers the contact sensor 28. The contact sensor 28 will receive an electrical signal and transmit it to the control system. After receiving the signal, the control system will increase the voltage of the electronically controlled damping mechanism 29 to the original value. At this time, the entire adaptive tensioning mechanism will return to its original state, and the gravity roller (22) will maintain the ideal position so that the material is in the ideal tension state. This achieves automated and autonomous protection of the material.

[0031] In this embodiment, a locking mechanism 4 is provided on the other side of the side-flipping frame 1. The locking mechanism 4 is used to lock or unlock the side-flipping frame 1 and the equipment base 3. The side-flipping frame 1 is made of aluminum profile. One side of the side-flipping frame 1 is connected to the equipment base 3 through a pivot mechanism 33, and the locking mechanism 4 is arranged on the other side to fix it in the latched state.

[0032] In this embodiment, the equipment base 3 has an internal equipment cabinet 31, and the control system is located inside the equipment cabinet 31. The equipment base 3 is used to support the equipment, and the equipment cabinet 31 is installed inside the equipment base 3. The equipment cabinet 31 contains the electrical equipment and control system required for the operation of the equipment, and has a built-in vision inspection program.

[0033] In this embodiment, the equipment base 3 is provided with a cabinet door. The cabinet door is located on the side of the equipment base 3 for easy maintenance.

[0034] In this embodiment, a telescopic keyboard holder 32 is provided on one side of the device base 3. A keyboard can be arranged there for easy operation.

[0035] In this embodiment, the side-flipping frame 1 is also equipped with a display 14, which is electrically connected to the control system. The display 14 and the telescopic keyboard rack 32 are located on the same side. The display 14 is arranged on the outer longitudinal beam on one side of the telescopic keyboard rack 32 of the side-flipping frame 1 and connected by a bracket.

[0036] In this embodiment, the plurality of cameras include a side camera 11 and a vertical camera 12. The vertical camera 12 is mounted on the top crossbeam of the side-opening frame 1 via a sliding bracket and is used for frontal image capture of the material. The sliding bracket connection facilitates adjustment of its longitudinal position. The side camera 11 is mounted on a side crossbeam on one side of the side-opening frame 1 via an adjustable bracket and is used for side image capture of the material. The adjustable bracket connection facilitates adjustment of its tilt angle. A light source 13 is mounted on a side crossbeam on the other side of the side-opening frame 1. The light source 13 is arranged opposite the side camera 11 to the crossbeam for illumination. In this embodiment, six sets of unpowered rollers 21 are arranged side by side, and two sets of gravity pressure rollers 22 are arranged on the support of two sets of unpowered rollers 21 through a cantilever mechanism 23. The inkjet printer 24 and the rotary encoder 26 are arranged between the two central rollers.

[0037] This invention also provides a method for detecting surface defects in rolled materials with an autonomous protection function against material tension overload, employing the aforementioned equipment for detecting surface defects in rolled materials with an autonomous protection function against material tension overload, comprising: S1: Open the side-tilting frame 1 and lay the roll material flat on the non-powered idler roller 21.

[0038] After determining the workstation to be inspected, open the locking mechanism 4 and open the side-tilting frame 1. Lay the roll material flat on the unpowered roller 21, keeping the material conveying direction parallel to the inspection direction. At this time, install the gravity pressure roller 22 and the cantilever mechanism 23 to press the roll material down with the gravity pressure roller 22. Adjust the limiting mechanism 25 to prevent the roll material from being over-tensioned. By adjusting the four limiting mechanisms 25 (two limiting mechanisms 25 are set for each cantilever mechanism 23), the roll material is finally brought into a taut state on the central roller. The area between these two central rollers is the defect inspection area.

[0039] S2: Close and lock the side-opening frame 1.

[0040] After completing the above steps, snap on and lock the side-tilting opening and closing frame 1.

[0041] S3: Adjust the limiting mechanism 25 so that the cantilever mechanism 23 contacts the limiting mechanism 25. When the contact sensor 28 is triggered, the downward pressure of the gravity roller 22 on the material can keep the material in an ideal tension state in the detection area. At this time, the control system increases the resistance to the rotation of the cantilever mechanism 23 through the electronic damping mechanism 29 so that the gravity roller 22 can maintain this position. When the equipment is powered on, adjust the limiting mechanism 25 to ensure that the initial position of the gravity roller 22 is in the ideal position. When the cantilever mechanism 23 contacts the limiting mechanism 25, that is, when the contact sensor 28 is triggered, the gravity roller 22 is in the ideal position, and the material maintains the ideal tension in the detection area.

[0042] Adjust the angle, distance, illumination, aperture, and focal length parameters of the vertical camera 12, the side camera 11, and the light source 13 to achieve optimal material imaging. The imaging effect can be judged by operating the built-in vision inspection program through the display 14 and the keyboard.

[0043] S4: Start the roll material production line. The vision inspection component collects images of the roll material surface in real time and transmits the image data to the control system.

[0044] After completing the above steps, start the roll production line to feed the material. Adjust the voltage of the electronically controlled damping mechanism 29 through the detection program interface to control the resistance of the gravity pressure roller 22 so that the material feeds smoothly. Ensure that the tension is appropriate in the detection area and observe the imaging effect. If it is not good, repeat the above operation until the best.

[0045] S5: The control system identifies defects on the surface of the roll material in real time. When a defect is detected on the surface of the roll material, the system calculates the location of the defect based on the signal from the rotary encoder 26 and controls the inkjet printer 24 to mark the area under the roll material.

[0046] When the tension force on the material is overloaded, the pressure value detected by the pressure sensor 27 will exceed the preset threshold. At this time, the control system reduces the voltage of the electronically controlled damping mechanism 29 to release the resistance of the cantilever mechanism 23 rotation. Under the action of the material tension force, the material lifts the gravity pressure roller 22 to release the tension force on the material and achieve the effect of protecting the material.

[0047] When the tension force on the material returns to the normal value or is lower than the overload value, the gravity roller 22 presses down due to its own weight. When the contact sensor 28 is triggered, the control system increases the voltage of the electronically controlled damping mechanism 29 to increase the resistance to the rotation of the cantilever mechanism 23, so that the gravity roller 22 is kept in this position so that the material is in the ideal tension state.

[0048] Once deployed, the system can perform unattended testing. After detecting surface defects, the program calculates the marking timing through the rotary encoder 26 and controls the inkjet printer 24 to mark the material. Production personnel can then identify the defect location through the marking.

[0049] Obviously, the above-disclosed embodiments of the present invention are merely for illustrating the present invention. The embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. It is neither necessary nor possible to exhaustively describe all embodiments herein.

Claims

1. A surface defect detection device for rolled materials with self-protection function against material tension overload, characterized in that, include: Equipment base (3); The detection roller assembly (2) includes a bracket, multiple unpowered rollers (21) rotatably mounted on the bracket, and two pressure roller assemblies. The multiple unpowered rollers (21) are arranged in parallel and spaced apart. The bracket is fixed on the equipment base (3). The pressure roller assembly includes a cantilever mechanism (23), a gravity pressure roller (22), an electrically controlled damping mechanism (29), a limit mechanism (25), and a contact sensor (28). The gravity pressure roller (22) is rotatably mounted on one end of the cantilever mechanism (23), and the other end of the cantilever mechanism (23) is rotatably mounted on the bracket. The frame has a central idler roller (21) located between two gravity rollers (22), and there are at least two central idlers. The area between the two central idlers is the detection area. The electronically controlled damping mechanism (29) is installed at the pivot of the cantilever mechanism (23) connected to the support, and is used to apply controllable resistance to the rotation of the cantilever mechanism (23). The limiting mechanism (25) is fixedly installed on the support, and the contact sensor (28) is installed on the limiting mechanism (25). The limiting mechanism (25) is located below the cantilever mechanism (23). Pressure sensor (27) is used to detect the pressure of the roll material on the central idler roller; A coding machine (24), located below the detection area, is used to mark rolls with surface defects; The rotary encoder (26) is used to detect the displacement speed of the roll material, and when a defect is detected on the surface of the roll material, the rotary encoder (26) calculates the marking time of the inkjet printer (24). A side-flipping opening and closing frame (1) is located above the equipment base (3), and one side of the side-flipping opening and closing frame (1) is rotatably connected to the equipment base (3); The visual inspection assembly, including multiple cameras and light sources (13), is mounted on a side-flipping frame (1); The control system is electrically connected to the pressure sensor (27), contact sensor (28), electronically controlled damping mechanism (29), inkjet printer (24), rotary encoder (26) and vision inspection component.

2. The roll material surface defect detection equipment with self-protection function against material tension overload as described in claim 1, characterized in that: The other side of the side-flipping frame (1) is provided with a locking mechanism (4), which is used to lock or unlock the side-flipping frame (1) and the equipment base (3).

3. The roll material surface defect detection equipment with self-protection function against material tension overload as described in claim 1, characterized in that: The equipment base (3) is equipped with an equipment cabinet (31), and the control system is located inside the equipment cabinet (31).

4. The roll material surface defect detection equipment with material tension overload self-protection function according to claim 1, characterized in that: The equipment base (3) is equipped with a cabinet door.

5. The roll material surface defect detection equipment with self-protection function against material tension overload as described in claim 1, characterized in that: The device base (3) is provided with a telescopic keyboard holder (32) on one side.

6. The roll material surface defect detection equipment with self-protection function against material tension overload as described in claim 5, characterized in that: The side-flipping frame (1) is also equipped with a display (14), which is electrically connected to the control system. The display (14) and the telescopic keyboard rack (32) are located on the same side.

7. The roll material surface defect detection equipment with self-protection function against material tension overload as described in claim 1, characterized in that: The multiple cameras include a side camera (11) and a vertical camera (12). The vertical camera (12) is mounted on the top crossbeam of the side-flipping frame (1) via a sliding bracket. The side camera (11) is mounted on the side crossbeam of one side of the side-flipping frame (1) via an adjustable bracket. The light source (13) is mounted on the side crossbeam of the other side of the side-flipping frame (1).

8. The roll material surface defect detection equipment with self-protection function against material tension overload as described in claim 1, characterized in that: The side-flipping hinged frame (1) is made of aluminum profile.

9. A method for detecting surface defects in rolled materials with self-protection function against material tension overload, characterized in that: The surface defect detection equipment for roll materials with self-protection function against material tension overload as described in any one of claims 1-8 includes: Open the side-tilting frame (1) and lay the roll material flat on the non-powered idler roller (21); Close and lock the side-opening frame (1); Adjust the limiting mechanism (25) so that the cantilever mechanism (23) contacts the limiting mechanism (25). When the contact sensor (28) is triggered, the downward pressure of the gravity roller (22) on the material can keep the material in an ideal tension state in the detection area. At this time, the control system increases the resistance to the rotation of the cantilever mechanism (23) through the electronic damping mechanism (29) so that the gravity roller (22) can maintain this position. The roll material production line is started, and the vision inspection component collects images of the roll material surface in real time and transmits the image data to the control system; The control system identifies defects on the surface of the roll material in real time. When a defect is detected on the surface of the roll material, the system calculates the defect location based on the signal from the rotary encoder (26) and controls the inkjet printer (24) to mark the area under the roll material.

10. The method for detecting surface defects of rolled materials with self-protection function against material tension overload as described in claim 9, characterized in that: When the tension force on the material is overloaded and the pressure value detected by the pressure sensor (27) exceeds the preset threshold, the control system reduces the voltage of the electronically controlled damping mechanism (29) to release the resistance of the cantilever mechanism (23) rotation. Under the action of the material tension force, the gravity pressure roller (22) is lifted to release the tension force. When the tension force on the material returns to the normal value or is lower than the overload value, the gravity roller (22) presses down due to its own weight. When the contact sensor (28) is triggered, the control system increases the voltage of the electronically controlled damping mechanism (29) to increase the resistance to the rotation of the cantilever mechanism (23), so that the gravity roller (22) is kept in this position so that the material is in the ideal tension state.

Images