Variable angle vision inspection device for artificial leather

Abstract

The utility model discloses a variable angle visual inspection device for artificial leather relates to artificial leather visual inspection technical field, it includes frame, send leather mechanism, lighting mechanism and photographic detection mechanism, and send leather mechanism includes special-shaped support roll and a plurality of round rolls, and the special-shaped support roll forms one or more inclined plane, and the artificial leather bypasses special-shaped support roll and is overlapped on inclined plane and round roll, and the frame is installed with drive unit, and the central shaft of round roll is connected in the output of drive unit, and lighting mechanism includes lamp and connecting frame, and connecting frame is connected with frame, and lamp is installed in support frame, and the lighting end of lamp faces special-shaped support roll, photographic detection mechanism is installed in frame and is located the top of special-shaped support roll, and photographic detection mechanism is electrically connected with control module, and control module is electrically connected in drive unit. The application has the effect of improving the accuracy of artificial leather flaw inspection.

Description

Technical Field

[0001] This application relates to the field of visual inspection technology for artificial leather, and in particular to a variable-angle visual inspection device for artificial leather. Background Technology

[0002] Artificial leather is a plastic product formed through multiple processes such as coating and calendering. After its production, it may have defects, so it is necessary to detect these defects. Currently, artificial leather is usually detected by manual visual inspection. This involves using a specially designed mechanical device (such as a fabric inspection machine, a special device for inspecting large-format, double-width, or single-width fabrics such as face, fur, and leather) to drive the artificial leather product at high speed in a roll-to-roll manner. During this process, the human eye examines dozens of defects on the surface of the artificial leather. This detection method has low efficiency and a high rate of false detection or missed detection, ultimately resulting in a low accuracy rate for defect detection. Therefore, this application proposes a new technical solution. Utility Model Content

[0003] To improve the accuracy of defect inspection in artificial leather, this application provides a variable-angle visual inspection device for artificial leather.

[0004] This application provides a variable-angle visual inspection device for artificial leather, employing the following technical solution:

[0005] A variable-angle visual inspection device for artificial leather includes a frame, a leather feeding mechanism for delivering artificial leather, an illumination mechanism connected to the frame, and a photographic inspection mechanism for capturing and detecting defects. The leather feeding mechanism includes a shaped support roller and multiple circular rollers. The shaped support roller forms one or more inclined surfaces. The artificial leather passes around the shaped support roller and overlaps the inclined surfaces and the circular rollers. At least one drive unit is mounted on the frame. The drive unit drives the circular rollers to rotate and deliver the artificial leather. The central axis of the circular rollers is connected to the output end of the drive unit. The illumination mechanism includes a lamp and a connecting frame. The connecting frame is connected to the frame and is positioned above the shaped support roller. The lamp is mounted on the support frame, and the illumination end of the lamp faces the shaped support roller. The photographic inspection mechanism is mounted on the frame and positioned above the shaped support roller. The photographic inspection mechanism is electrically connected to a control module, which is electrically connected to the drive unit.

[0006] Optionally, a servo motor for driving the inclined angle of the irregular support roller is installed on the frame. The frame is provided with a support. A rotating shaft is fixed inside the irregular support roller. Both ends of the rotating shaft are connected to the support. The servo motor is connected to a rotary encoder. The control module is electrically connected to the rotary encoder and the servo motor.

[0007] Optionally, the photographic inspection mechanism includes a camera and a mounting bracket for mounting the camera. The camera's image-facing end is vertically downward. The camera includes at least two cameras, which are arranged horizontally on the mounting bracket. The mounting bracket is connected to a frame at both ends and is mounted above the frame. The camera is electrically connected to a control module.

[0008] Optionally, a lateral moving unit is installed on the connecting frame, the lamp is connected to the slider of the lateral moving unit, and the lateral moving unit is connected to the control module.

[0009] Optionally, the lamp is elongated and at least ensures that the light emitted by the lamp is sufficient to cover the artificial leather on the inclined surface of the irregular support roller.

[0010] Optionally, the camera's mounting bracket is equipped with a pan-tilt unit, and the camera is mounted on the pan-tilt unit.

[0011] In summary, this application includes the following beneficial technical effects: The artificial leather is delivered at a uniform speed by a leather feeding mechanism. Simultaneously, an illumination mechanism illuminates the surface of the section of artificial leather to be inspected, making defects more obvious and easier to detect. A camera captures images downwards, and the results are uploaded to a control module for analysis. Compared to manual visual inspection, this method offers higher accuracy in defect detection and reduces the rate of missed or false detections. Furthermore, this application also incorporates a shaped support roller. By attaching the artificial leather to the inclined surface of the shaped support roller, the exposure caused by the curvature of a round roller structure is reduced. The angle between the artificial leather surface and the camera during image capture is also altered, resulting in a tilted image that makes defects easier to detect, further improving the accuracy of defect detection. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this application;

[0013] Figure 2 This is a schematic diagram of the agency that submitted the application for approval;

[0014] Figure 3 This is a side view of this application;

[0015] Figure 4 This is a schematic diagram of the control module connection in this application.

[0016] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Leather feeding mechanism; 3. Lighting mechanism; 4. Photographic inspection mechanism; 5. Artificial leather; 6. Control module; 12. Support; 21. Irregular support roller; 22. Circular roller; 221. Drive unit; 23. Servo motor; 231. Rotary encoder; 31. Light fixture; 32. Connecting frame; 33. Lateral movement unit; 41. Camera; 42. Gimbal; 43. Fixture. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0018] This application discloses a variable-angle visual inspection device for artificial leather.

[0019] Reference Figure 1 and Figure 2 The variable-angle visual inspection device for artificial leather includes a frame 1, a leather feeding mechanism 2, an illumination mechanism 3, and a photographic inspection mechanism 4. The frame 1 is used to fix or install the aforementioned mechanisms, providing a platform for defect detection of the artificial leather 5. The frame 1 is covered by an integrally enclosed shell (not shown in the figure). The leather feeding mechanism 2 is used to deliver the artificial leather 5. The artificial leather 5, after production, can be an uncut strip. The artificial leather 5 is gradually delivered along its length to the inspection area (i.e., the area corresponding to the photographic inspection mechanism 4 and the illumination mechanism 3), and after inspection, it is handed out for subsequent processing. The illumination mechanism 3 is used to illuminate the surface of the artificial leather 5 to facilitate defect detection. The photographic inspection mechanism 4 is used to capture images of the surface of the artificial leather 5. The photographic inspection mechanism 4 is also electrically connected to a control module 6, which can acquire the images captured by the photographic inspection mechanism 4 and detect the presence of defects.

[0020] With the above setup, the artificial leather 5 is placed in the device and delivered by the leather feeding mechanism 2. When the section of artificial leather 5 to be inspected arrives at the inspection area, the lighting mechanism 3 illuminates the surface of the artificial leather 5 to make defects more visible. At the same time, the photographic inspection mechanism 4 simultaneously captures images of the surface of the artificial leather 5. The photographic inspection mechanism 4 can capture images at a rate of ten frames per second, which must be at least faster than the delivery speed to effectively prevent missed inspections. The control module 6 analyzes whether there are defects in the artificial leather 5 in the photographs and feeds back the analysis results (which can be fed back through a display). The analysis of the control module 6 can be based on preset images of various defects as comparison images, comparing the images to be analyzed with the comparison images one by one to obtain the results.

[0021] With the automated delivery of artificial leather 5, the photographic inspection agency 4 taking pictures, and the control module 6 analyzing the data, the detection results are more accurate than those obtained by visual inspection by human eyes, greatly reducing the probability of missed detections and improving work efficiency.

[0022] The following is a detailed explanation of the structure of each organization:

[0023] Reference Figure 1 and Figure 3The leather feeding mechanism 2 includes a shaped support roller 21 and multiple circular rollers 22, with at least two circular rollers 22 located on both sides of the shaped support roller 21. The artificial leather 5 passes around the shaped support roller 21 and overlaps the inclined surface and the circular rollers 22 (e.g., in a W-shape). The artificial leather 5 can be stretched to a relatively taut state and closely adheres to the surfaces of the circular rollers 22 and the shaped support roller 21, thus facilitating inspection by the photographic inspection mechanism 4. A drive unit 221 is installed on the frame 1. The drive unit 221 can be a motor equipped with a reducer. The output end of the motor is fixedly connected to the central axis of the circular rollers 22, thereby driving the circular rollers 22 to rotate and further driving the artificial leather 5 to be continuously and uniformly transmitted in the designated direction (i.e., the direction of the inspection area).

[0024] One or more sidewalls of the irregular support roller 21 are inclined, and a section of artificial leather 5 at the inclined section is the artificial leather 5 to be inspected. The light from the lighting mechanism 3 mainly illuminates the inclined section. When the artificial leather 5 is in close contact with the inclined surface of the irregular support roller 21, the surface to be inspected is also in an inclined state. Without a curved surface, the light emitted by the lighting mechanism 3 can be more evenly distributed on the surface of the artificial leather 5, and will not converge to a certain point or area, reducing the impact on the photographic inspection mechanism 4 and further improving the accuracy of the inspection.

[0025] Among them, the defects of artificial leather 5 are of different types, and different defects require different shooting angles for detection. For example, paper scars, bright lines, parking marks, etc. These defects may only be revealed or are more easily revealed under specific shooting angles. If there is only one type of lighting or shooting angle, the existence of defects may not be detected, which may easily lead to missed detection. Therefore, the following design was made:

[0026] Reference Figure 1 and Figure 3 The frame 1 is equipped with a servo motor 23 for driving the irregular support roller 21 to rotate and thus adjusting the slope angle. The servo motor 23 can be installed on the mounting base set on the frame 1 by bolts and nuts. The servo motor 23 needs to be equipped with a reducer for speed reduction. The frame 1 is provided with a support 12. A rotating shaft is fixed inside the irregular support roller 21. Both ends of the rotating shaft extend out of the irregular support roller 21 and are rotatably connected to the support 12. The output end of the servo motor 23 is connected to the rotating shaft through a coupling.

[0027] Reference Figure 4To better control the servo motor 23 driving the irregular support roller 21 to rotate to the specified inclined plane angle, the servo motor 23 is connected to a rotary encoder 231. This encoder may have a gear set, with the output shaft of the servo motor fixedly connected to one gear in the gear set, and the shaft of the rotary encoder fixedly connected to the other gear. The two gears mesh with each other, and their diameters, sizes, and other specifications are equal. Thus, the rotary encoder 231 can obtain the rotational speed of the servo motor's output shaft through the gear set. Both the rotary encoder 231 and the servo motor 23 are electrically connected to the control module 6, thereby controlling them to perform corresponding operations.

[0028] Example as follows: Different inclined plane angles corresponding to the detection of artificial leather 5 or defects are preset in the control module 6 (the control module 6 can be a computer or other equipment used to control the device). The type of artificial leather 5 is determined by the camera 41 or the type of defect to be detected is manually controlled by the staff. After receiving feedback, the control module 6 controls the servo motor 23 to rotate the irregular support roller 21 to the specified angle. The required rotation angle and the rotation time are determined based on the feedback from the rotary encoder 231. Suppose that a defect in a certain type of artificial leather 5 can only be detected when the angle between the camera 41 and the inclined plane is 30 degrees. Currently, the angle between the inclined plane and the camera 41 is 60 degrees (when the camera is vertically downward, the angle between the shooting path and the inclined plane on the side away from the light is defined as the angle between the inclined plane and the camera 41. Since the inclined plane is basically tilted towards the lighting mechanism 3, if it is not facing it, it will result in poor lighting or backlighting, so the angle between the camera 41 and the inclined plane is mostly an acute angle). Then, the irregular support roller 21 needs to be rotated, and the servo motor 23 is controlled to rotate to obtain the data of the rotary encoder 231. When the irregular support roller 21 rotates counterclockwise by 30 degrees, it stops, and then the detection work begins.

[0029] Regarding defect identification, multiple standard images can be preset for comparison to determine if defects exist in the artificial leather 5. Frames of the footage captured by camera 41 are extracted and compared one by one with the standard images to analyze whether defects exist. Since image comparison is an existing technology, it will not be elaborated upon here.

[0030] With the above settings, different detection angles can be adapted to different defects or five types of artificial leather, making the detection more flexible and increasing the accuracy to a certain extent.

[0031] Reference Figure 1 and Figure 2The lighting mechanism 3 includes a lamp 31 and a connecting frame 32. The connecting frame 32 is connected to the frame 1. The frame 1 may have an integrally formed connecting plate for mounting the connecting frame 32 facing upwards. The connecting frame 32 is fixed to the connecting plate with bolts and nuts, thus positioning the lighting mechanism 3 above the artificial leather 5, facilitating light to fall onto the surface of the artificial leather 5. The lighting end of the lamp 31 faces the inclined surface of the irregular support roller 21. Since the lamp 31 may only illuminate a portion of the artificial leather 5 surface, the following design is made:

[0032] In another embodiment of this application:

[0033] Reference Figure 2 A transverse moving unit 33 is installed on the connecting frame 32. The transverse moving unit 33 can be a linear guide rail. The guide rail and the connecting frame 32 are connected and fixed by bolts and nuts. The lamp 31 is installed on the slider. The linear guide rail is connected to the control module 6. The lamp 31 can be moved in this way so that the light emitted by the lamp 31 can sweep the section to be inspected through the drive of the linear guide rail. In order to capture or inspect as many defects as possible in the inspection area, it is necessary to coordinate with the speed at which the artificial leather 5 is conveyed. Therefore, when the control module 6 controls the slider of the linear guide rail to slide, it needs to synchronously control the drive unit 221 connected to the roller 22 to stop rotating until the slider of the linear guide rail slides to the end. Then, the drive unit 221 is rotated again so that the section of artificial leather 5 that has been captured and inspected continues to be pushed forward to start the inspection of the next section of artificial leather 5. This process is repeated.

[0034] In another embodiment of this application:

[0035] The lamp 31 can be a long strip lamp 31, meaning that the light emitted by the lamp 31 can completely cover the artificial leather 5 corresponding to the detection area. Therefore, the length of the lamp 31 needs to be long enough, as close as possible to the width of the artificial leather 5, to ensure that the illumination is sufficiently uniform. Using this implementation method, there is no need to use the lateral movement unit 33 for driving, nor is there a need for the drive unit 221 to cooperate in stopping, making it more efficient and convenient.

[0036] Reference Figure 1The camera inspection mechanism 4 is installed on the frame 1 and located above the irregular support roller 21. The camera mechanism includes a camera 41 and a fixing frame 43 for installing the camera 41. The fixing frame 43 can be connected to the frame 1 at both ends and erected above the section of artificial leather 5 to be inspected (i.e., a section of artificial leather 5 that is attached to the irregular support roller 21). The camera end of camera 41 is vertically downward, forming an angle with the inclined surface of the irregular support roller 21. This allows for defect detection from different angles. The camera 41 is mounted above the artificial leather 5 for shooting because leather factories may have lint or dust falling onto the lens of camera 41, causing blurry images and affecting detection accuracy. Secondly, vibration is inevitable during equipment operation. If camera 41 is set upward, vibration can cause the connection to loosen after prolonged use, changing the shooting angle and affecting detection accuracy. By shooting downward, camera 41 can maintain a vertical downward position under gravity, minimizing the decrease in accuracy caused by changes in shooting angle.

[0037] Reference Figure 1 and Figure 2 The photographic inspection mechanism 4 includes at least two cameras 41. One camera can be used for inspection, and the other for verification; alternatively, they can cover different shooting areas, thereby increasing work efficiency and improving the accuracy of inspection results. The two cameras 41 are arranged horizontally on the mounting frame 43. In another embodiment of this application, if the shooting area of ​​the camera 41 is small, two lead screw slides can be installed on the mounting frame 43, with the two cameras 41 respectively mounted on the two lead screw slides. This allows the camera 41 to be moved via the lead screw slides, increasing the shooting area of ​​the camera 41 and enabling a more comprehensive inspection or verification of the leather surface.

[0038] The camera 41 is mounted on a gimbal 42 on a mounting bracket 43. The camera 41 is mounted on the gimbal 42. The gimbal 42 structure can ensure the stability of the camera 41 and reduce the shaking of the captured image.

[0039] How to use:

[0040] The produced artificial leather 5 is placed into the leather feeding mechanism 2, and the device is turned on to deliver the artificial leather 5 at a uniform speed. During the delivery of the artificial leather 5, the lamp 31 begins to illuminate the surface of the artificial leather 5, and the camera 41 simultaneously takes pictures. The pictures are fed back to the control module 6 for analysis and judgment. If defects are found, a prompt is given. If it is necessary to change the type of artificial leather 5 being tested or to change the type of defect to be detected, the staff adjusts the tilt angle of the inclined surface of the irregular support roller 21 and repeats the above process.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A variable angle visual inspection apparatus for artificial leather, characterized by: The system includes a frame (1), a leather feeding mechanism (2) for delivering artificial leather (5), a lighting mechanism (3) connected to the frame (1), and a photographic inspection mechanism (4) for photographing and detecting defects. The leather feeding mechanism (2) includes a shaped support roller (21) and multiple circular rollers (22). The shaped support roller (21) forms one or more inclined surfaces. The artificial leather (5) passes around the shaped support roller (21) and overlaps the inclined surfaces and the circular rollers (22). At least one drive unit (221) is mounted on the frame (1). The drive unit (221) is used to drive the circular rollers (22) to rotate and deliver the artificial leather (5). The central axis of the circular roller (22) is connected to the output end of the drive unit (221). The lighting mechanism (3) includes a lamp (31) and a connecting frame (32). The connecting frame (32) is connected to the frame (1) and is located above the irregular support roller (21). The lamp (31) is mounted on the support frame and the lighting end of the lamp (31) faces the irregular support roller (21). The photographic inspection mechanism (4) is mounted on the frame (1) and is located above the irregular support roller (21). The photographic inspection mechanism (4) is electrically connected to a control module (6), and the control module (6) is electrically connected to the drive unit (221).

2. The variable angle visual inspection apparatus for artificial leather according to claim 1, characterized in that: The frame (1) is equipped with a servo motor (23) for driving the inclined angle of the irregular support roller (21). The frame (1) is provided with a support (12). A rotating shaft is fixed inside the irregular support roller (21). The two ends of the rotating shaft are connected to the support (12). The servo motor (23) is connected to a rotary encoder (231). The control module (6) is electrically connected to the rotary encoder (231) and the servo motor (23).

3. The variable angle visual inspection apparatus for artificial leather according to claim 2, characterized in that: The photographic inspection mechanism (4) includes a camera (41) and a mounting bracket (43) for mounting the camera (41). The camera end of the camera (41) is vertically downward. The camera (41) includes at least two cameras. The two cameras (41) are arranged horizontally on the mounting bracket (43). The two ends of the mounting bracket (43) are connected to the frame (1) and mounted on the frame (1). The camera (41) is electrically connected to a control module (6).

4. The variable angle visual inspection apparatus for artificial leather according to claim 2, characterized in that: A lateral moving unit (33) is installed on the connecting frame (32), the lamp (31) is connected to the slider of the lateral moving unit (33), and the lateral moving unit (33) is connected to the control module (6).

5. The variable angle visual inspection apparatus for artificial leather according to claim 2, characterized in that: The lamp (31) is long and narrow, and at least ensures that the light emitted by the lamp (31) is sufficient to cover the artificial leather (5) on the inclined surface of the irregular support roller (21).

6. The variable angle visual inspection apparatus for artificial leather according to claim 3, characterized in that: The camera (41) is mounted on a gimbal (42) on a mounting bracket (43).

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