A visual detector for the flatness of a leather surface

Abstract

The application discloses a kind of leather surface flatness visual detector, including detection table, the inner wall of detection table is rotationally installed with feeding drive roller, the outer surface of detection table is fixedly installed with U-shaped support plate, the upper surface of U-shaped support plate is fixedly installed with reciprocating slider, and the lower portion of reciprocating slider is provided with detection plate, the bottom of detection plate is fixedly installed with symmetric light supplementing lamp plate, the bottom of detection plate is fixedly installed with visual industrial camera, and the bottom of detection table is fixedly installed with fixed support plate.The application forms intermittent transmission structure by servo motor cooperation drive turntable, sliding shift column and grooved wheel, realizes leather step feeding and instantaneous locking positioning, makes leather stationary in snapshot stage, avoids displacement deviation generated by dynamic shooting, improves the identification precision of subtle flatness concave-convex flaw, reduces equipment false detection, missed detection rate, and improves overall detection stability.

Description

Technical Field

[0001] This application relates to the field of leather inspection technology, and in particular to a visual detector for the surface flatness of leather. Background Technology

[0002] In the production and processing of leather products, the smoothness of the leather surface is a core indicator for determining the product grade and appearance quality. Defects such as bumps, wrinkles, bulges, and depressions on the leather surface will directly affect the subsequent cutting, bonding, and finished product appearance quality. Therefore, the smoothness defect detection and screening must be carried out before the leather leaves the factory.

[0003] Currently, most leather visual inspection equipment adopts a continuous uniform feeding mode. The leather is in a dynamic state throughout the inspection process, and the visual camera does not stop or pause when shooting. The captured image is prone to ghosting, blurring, and displacement deviation. The accuracy of identifying minor unevenness and dents is extremely poor, with high false detection and false negative rates and poor detection stability. Moreover, most visual inspection mechanisms are fixed installation structures with a fixed shooting range, which cannot achieve reciprocating full coverage scanning. Blind spots are prone to appear in local areas of the leather, affecting the detection accuracy. Therefore, to solve the above problems, we provide a leather surface flatness visual detector. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing a visual detector for the flatness of leather surfaces.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A visual detector for the flatness of leather surface includes a detection platform, a feeding drive roller rotatably mounted on the inner wall of the detection platform, a U-shaped support plate fixedly mounted on the outer surface of the detection platform, a reciprocating slider fixedly mounted on the upper surface of the U-shaped support plate, a detection plate arranged below the reciprocating slider, a symmetrical supplementary light plate fixedly mounted on the bottom surface of the detection plate, a visual industrial camera fixedly mounted on the bottom surface of the detection platform, a fixed support plate fixedly mounted on the bottom surface of the detection platform, a servo motor fixedly mounted on one side of the fixed support plate, a drive turntable fixedly mounted on the output end of the servo motor, a sliding pin rotatably mounted on one side of the drive turntable, a grooved wheel fixedly mounted on one end of the feeding drive roller, and four transmission grooves formed on the outer surface of the grooved wheel.

[0006] Preferably, the outer surface of the sliding pin is slidably adapted to the inner wall of the transmission groove, and the outer surface of the groove wheel is provided with annularly arranged arc-shaped limiting holes, and the inner wall of the arc-shaped limiting holes is in contact with the outer surface of the drive turntable.

[0007] Preferably, the reciprocating slider includes a drive slide fixedly mounted on the upper surface of the U-shaped support plate and a variable frequency motor fixedly mounted on one side of the drive slide. A reciprocating lead screw is rotatably mounted on the inner wall of the drive slide, and a reciprocating nut slider is slidably connected to the inner wall of the drive slide. The inner wall of the reciprocating nut slider is rollingly connected to the outer surface of the reciprocating lead screw, and one end of the reciprocating lead screw is fixedly mounted on the output end of the variable frequency motor. The bottom surface of the reciprocating nut slider is fixedly connected to the upper surface of the detection plate. The two supplementary light plates are respectively located on both sides of the vision industrial camera. Two limiting sliders are fixedly connected to the upper surface of the detection plate. Limiting slide rails are fixedly connected to both sides of the drive slide, and the outer surface of the limiting slider is slidably connected to the outer surface of the limiting slide rail.

[0008] Preferably, a fixed carrier plate is fixedly connected to the upper surface of the testing platform, and two pressure springs are fixedly connected to the bottom surface of the fixed carrier plate. The bottom ends of the two pressure springs are fixedly connected to a U-shaped pressure plate. Two leveling pre-pressure rollers are rotatably installed on the inner wall of the U-shaped pressure plate. Limiting sliding openings are opened on both sides of the testing platform, and the two ends of the U-shaped pressure plate extend into the interior of the two limiting sliding openings respectively.

[0009] Preferably, a protective cover is fixedly installed on one side of the testing table, and the drive turntable and the grooved wheel are both located inside the protective cover.

[0010] Preferably, a testing host is fixedly installed on one side of the testing station.

[0011] The beneficial effects of this invention are: 1. This leather surface flatness visual detector uses a servo motor in conjunction with a drive turntable, sliding pin and grooved wheel to form an intermittent transmission structure, realizing leather step feeding and instantaneous locking positioning, so that the leather is stationary during the capture stage, avoiding displacement deviation caused by dynamic shooting, improving the recognition accuracy of minor flatness defects, reducing the false detection and missed detection rate of the equipment, and improving the overall detection stability. 2. This visual detector for leather surface flatness abandons the traditional fixed shooting structure and adopts a reciprocating sliding scanning detection structure. In the static capture area of ​​the leather, the frequency conversion motor drives the reciprocating screw to rotate, which drives the nut slider and the detection plate to slide smoothly back and forth laterally. This allows the bottom industrial camera, together with the supplementary light plate, to complete the full-coverage image acquisition of the leather surface. Then, by replacing fixed-point shooting with moving reciprocating scanning, it makes up for the defects of traditional equipment with fixed shooting range and inability to detect local areas, ensuring that no defects on the leather surface are missed and improving the accuracy of leather flatness detection. Attached Figure Description

[0012] Figure 1 Here is a structural diagram of the leather surface flatness visual detector of the present invention, viewed from the front. Figure 2Here is a structural diagram of the leather surface flatness visual detector of the present invention, viewed from below. Figure 3 Here is a side cross-sectional view of the detection stage in the leather surface flatness visual detector of the present invention; Figure 4 Here is a structural diagram of the U-shaped support plate in the leather surface flatness visual detector of the present invention, viewed from below. Figure 5 The diagram shows the top view of the feeding drive roller in the leather surface flatness visual detector of the present invention.

[0013] The attached diagram lists the components represented by each number as follows: 1-Inspection table; 2-Feeding drive roller; 3-U-shaped support plate; 4-Reciprocating slider; 41-Drive slide; 42-Variable frequency motor; 43-Reciprocating nut slider; 44-Reciprocating lead screw; 45-Limit slider; 46-Limit slide rail; 5-Inspection plate; 51-Industrial vision camera; 52-Supplemental light plate; 6-Protective cover; 7-Limit slide opening; 8-Fixed carrier plate; 9-Pressure spring; 10-Leveling pre-pressure roller; 11-U-shaped pressure plate; 12-Fixed support plate; 13-Servo motor; 14-Drive turntable; 15-Sliding pin; 16-Gutter wheel; 17-Arc-shaped limit hole; 18-Transmission groove; 19-Inspection host. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0015] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0016] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0017] Reference Figures 1-5 A visual detector for the flatness of leather surface includes a detection platform 1. A feeding drive roller 2 is rotatably installed on the inner wall of the detection platform 1. The feeding drive roller 2 is made of wear-resistant alloy steel, which has high strength and anti-deformation characteristics and can stably transport leather materials. A U-shaped support plate 3 is fixedly installed on the outer surface of the detection platform 1. The U-shaped support plate 3 adopts an integral casting structure, which has strong structural rigidity and high load-bearing stability. A reciprocating slider 4 is fixedly installed on the upper surface of the U-shaped support plate 3. A detection plate 5 is set below the reciprocating slider 4. The detection plate 5 is made of lightweight aluminum alloy, which is lightweight and has low sliding inertia. A symmetrical supplementary light plate 52 is fixedly installed on the bottom surface of the detection plate 5. The supplementary light plate 52 adopts a high-brightness LED cold light source, which provides uniform and soft light without flickering and does not burn the leather surface. A vision industrial camera 51 is fixedly mounted on the bottom surface of the inspection plate 5. The vision industrial camera 51 adopts a high-definition pixel industrial imaging module, which has high imaging resolution and fast response speed. A fixed support plate 12 is fixedly mounted on the bottom surface of the inspection table 1. A servo motor 13 is fixedly mounted on one side of the fixed support plate 12. The servo motor 13 adopts a closed-loop control electrical drive principle, with no delay in speed and start / stop response. A drive turntable 14 is fixedly mounted on the output end of the servo motor 13. A sliding pin 15 is rotatably mounted on one side of the drive turntable 14. One end of the feeding drive roller 2 is fixedly mounted with... The device includes a grooved wheel 16 with four transmission grooves 18 on its outer surface. Specifically, when the servo motor 13 is powered on, it can drive the drive turntable 14 to rotate at a constant speed, causing the sliding pin 15 to move in a circular motion synchronously. By relying on the four evenly distributed transmission grooves 18, intermittent transmission can be achieved, which can control the rotation and start / stop of the feeding drive roller 2, realize quantitative step feeding of leather, change the drawback of continuous uniform feeding in traditional equipment, provide a basis for static high-definition capture, effectively avoid image blurring and ghosting problems caused by dynamic shooting, and ensure the stability of the feeding conditions in the early stage of leather inspection.

[0018] Furthermore, the outer surface of the sliding pin 15 slides and adapts to the inner wall of the transmission groove 18. The surface of the sliding pin 15 is polished and wear-resistant, ensuring smooth sliding and preventing wear and jamming during long-term use. The outer surface of the groove wheel 16 is provided with annularly arranged arc-shaped limiting holes 17, and the inner wall of the arc-shaped limiting holes 17 contacts the outer surface of the drive turntable 14. The curvature of the arc-shaped limiting holes 17 matches the outer wall of the drive turntable 14, resulting in high limiting and fitting accuracy. A protective cover 6 is fixedly installed on one side of the testing table 1. The protective cover 6 is made of transparent PC flame-retardant material, combining protection, dustproofing, and transparency. The optical observation function is provided. Both the drive turntable 14 and the grooved wheel 16 are located inside the protective cover 6. Specifically, during the rotation of the drive turntable 14, when the sliding pin 15 is embedded in the transmission groove 18, it can rotate the grooved wheel 16 to a fixed angle, which in turn drives the feeding drive roller 2 to complete the leather feeding action. When the sliding pin 15 rotates out of the transmission groove 18, the outer wall of the drive turntable 14 tightly fits the arc-shaped limiting hole 17, realizing the mechanical locking and positioning of the grooved wheel 16, which makes the feeding drive roller 2 stop instantly and the leather completely still. This mechanical limiting and locking structure has high positioning accuracy and no displacement deviation.

[0019] Furthermore, the reciprocating slider 4 includes a drive slide 41 fixedly mounted on the upper surface of the U-shaped support plate 3 and a variable frequency motor 42 fixedly mounted on one side of the drive slide 41. The variable frequency motor 42 adopts the electrical principle of variable frequency speed regulation, which can adjust the speed as needed to adapt to different scanning and detection requirements. A reciprocating lead screw 44 is rotatably mounted on the inner wall of the drive slide 41. The reciprocating lead screw 44 adopts a precision ball screw structure, which has high transmission accuracy and no jamming in reciprocating motion. A reciprocating nut slider 43 is slidably connected to the inner wall of the drive slide 41. The inner wall of the reciprocating nut slider 43 is rolledly connected to the outer surface of the reciprocating lead screw 44, and one end of the reciprocating lead screw 44 is fixedly mounted on the output end of the variable frequency motor 42. The bottom surface of the reciprocating nut slider 43 is fixedly connected to the upper surface of the detection plate 5. Two supplementary light plates 52 are located on both sides of the vision industrial camera 51, and symmetrical lighting can eliminate shooting shadows. Two limiting sliders 45 are fixedly connected to the upper surface of the detection plate 5. Limiting slide rails 46 are fixedly connected to both sides of the drive slide 41, and the outer surface of the limiting slider 45 is slidably connected to the outer surface of the limiting slide rail 46. The sliding fit has a small clearance and high running stability. Specifically, during the leather static capture period, the variable frequency motor 42 drives the reciprocating screw 44 to rotate at a constant speed. Through the screw nut transmission principle, the reciprocating nut slider 43 is driven to slide smoothly back and forth laterally along the drive slide 41. At the same time, the limiting slider 45 and the limiting slide rail 46 cooperate to play a guiding and limiting role, preventing the detection plate 5 from sliding off course. This drives the vision industrial camera 51 and the two side supplementary light plates 52 to synchronously scan the entire horizontal area, replacing the traditional fixed shooting structure, completely eliminating the blind spot of leather detection, and with the uniform supplementary lighting effect, acquiring high-definition and complete leather surface images to ensure that no defects are missed.

[0020] Furthermore, a fixed carrier plate 8 is fixedly connected to the upper surface of the testing table 1, and two pressure springs 9 are fixedly connected to the bottom surface of the fixed carrier plate 8. The pressure springs 9 are made of high-strength carbon spring steel, with stable elastic deformation performance and pressure resistance and durability. The bottom ends of the two pressure springs 9 are fixedly connected to a U-shaped pressure plate 11. The U-shaped pressure plate 11 has high structural strength, uniform force distribution and is not easily deformed. Two leveling pre-pressure rollers 10 are rotatably mounted on the inner wall of the U-shaped pressure plate 11. The surface of the leveling pre-pressure rollers 10 is treated with flexible anti-slip rubber coating, which fits the leather without damaging the fabric. Limiting slots 7 are opened on both sides of the testing table 1. The two ends of the U-shaped pressure plate 11 extend into the interior of the two limiting slots 7 respectively. The limiting slots 7 can restrict the movement trajectory of the pressure plate and prevent deviation. Specifically, before the equipment is operated, the leather passes through the gap between the leveling pre-pressure rollers 10 and the table surface of the testing table 1. The two pressure springs 9 at the bottom of the fixed carrier plate 8 continuously apply downward elastic pressure, pushing the U-shaped pressure plate 11 vertically and stably downward along the limiting slots 7, so that the two leveling pre-pressure rollers 10 adapt to fit the upper surface of leather with different thicknesses and flatness, effectively smoothing the leather edges, loose wrinkles and slight protrusions, flattening and shaping the leather to be tested, and ensuring that the surface of the test substrate is flat and regular.

[0021] Working principle: The leather first passes through the gap between the leveling pre-pressing roller 10 and the table surface of the inspection table 1. The pressure spring 9 at the bottom of the fixed carrier plate 8 continuously applies downward elastic pressure, pushing the U-shaped pressure plate 11 down, so that the leveling pre-pressing roller 10 adapts to the upper surface of the leather, which can smooth out the raised edges and loose wrinkles of the leather. During the inspection operation, the servo motor 13 drives the drive turntable 14 to rotate continuously, driving the sliding pin 15 to move synchronously in a circular motion. When the sliding pin 15 is embedded in the transmission groove 18 of the grooved wheel 16, it moves the grooved wheel 16 to rotate at a fixed angle, driving the feeding drive roller 2 to rotate to realize the step feeding of the leather. When the sliding pin 15 rotates out of the transmission groove 18, the drive turntable 14 fits against the outer wall of the arc-shaped limiting hole 17 to realize the locking and positioning of the grooved wheel 16, the feeding drive roller 2 stops rotating instantly, and the leather is completely still, providing a stable and static working condition for visual capture. During the period when the leather is stationary and captured, the variable frequency motor 42 of the reciprocating slider 4 drives the reciprocating lead screw 44 to rotate, which in turn drives the reciprocating nut slider 43 to slide laterally back and forth along the drive slide 41. Then, the vision industrial camera 51 at the bottom of the detection plate 5, together with the supplementary light plates 52 on both sides, follows the detection plate 5 to perform a full-area horizontal scan, and performs full-coverage image acquisition on the leather surface to eliminate blind spots. Then, the vision industrial camera 51 transmits the acquired high-definition images to the detection host 19 in real time. The detection host 19 uses built-in image algorithm comparison and analysis to identify flatness defects such as unevenness, wrinkles, bulges, and depressions on the leather surface, automatically determines whether the product is qualified or not, completes automated high-precision detection, and then continues to be transported for further detection.

[0022] It should also be noted that, in terms of circuit structure, the drive and control circuits of this invention are common and mature technologies. Those skilled in the art can select appropriate circuit components to build the circuit according to the power requirements and control requirements of the equipment. For the power supply components, common general power supply equipment on the market and the electrical components of this application can be used. These are all common electrical devices in the prior art, and this application will not elaborate further.

[0023] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0024] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A visual detector for the flatness of leather surfaces, comprising a detection stage (1), characterized in that: The inner wall of the testing platform (1) is rotatably equipped with a feeding drive roller (2), the outer surface of the testing platform (1) is fixedly equipped with a U-shaped support plate (3), the upper surface of the U-shaped support plate (3) is fixedly equipped with a reciprocating slider (4), the lower part of the reciprocating slider (4) is equipped with a testing plate (5), the bottom surface of the testing plate (5) is fixedly equipped with a symmetrical supplementary light plate (52), the bottom surface of the testing plate (5) is fixedly equipped with a vision industrial camera (51), the bottom surface of the testing platform (1) is fixedly equipped with a fixed support plate (12), one side of the fixed support plate (12) is fixedly equipped with a servo motor (13), the output end of the servo motor (13) is fixedly equipped with a drive turntable (14), one side of the drive turntable (14) is rotatably equipped with a sliding pin (15), one end of the feeding drive roller (2) is fixedly equipped with a grooved wheel (16), and the outer surface of the grooved wheel (16) is provided with four transmission grooves (18).

2. The visual detector for leather surface flatness according to claim 1, characterized in that: The outer surface of the sliding pin (15) is slidably adapted to the inner wall of the transmission groove (18), and the outer surface of the groove wheel (16) is provided with annularly arranged arc-shaped limiting holes (17), and the inner wall of the arc-shaped limiting holes (17) is in contact with the outer surface of the drive turntable (14).

3. The visual detector for leather surface flatness according to claim 1, characterized in that: The reciprocating slider (4) includes a drive slide (41) fixedly installed on the upper surface of the U-shaped support plate (3) and a variable frequency motor (42) fixedly installed on one side of the drive slide (41). A reciprocating screw (44) is rotatably installed on the inner wall of the drive slide (41). A reciprocating nut slider (43) is slidably connected to the inner wall of the drive slide (41). The inner wall of the reciprocating nut slider (43) is rolledly connected to the outer surface of the reciprocating screw (44), and one end of the reciprocating screw (44) is fixedly installed at the output end of the variable frequency motor (42).

4. A visual detector for leather surface flatness according to claim 3, characterized in that: The bottom surface of the reciprocating nut slider (43) is fixedly connected to the upper surface of the detection plate (5). The two supplementary light plates (52) are located on both sides of the vision industrial camera (51). Two limiting sliders (45) are fixedly connected to the upper surface of the detection plate (5). Limiting slide rails (46) are fixedly connected to both sides of the drive slide (41), and the outer surface of the limiting slider (45) is slidably connected to the outer surface of the limiting slide rail (46).

5. A visual detector for leather surface flatness according to claim 1, characterized in that: The upper surface of the testing platform (1) is fixedly connected to a fixed carrier plate (8), and the bottom surface of the fixed carrier plate (8) is fixedly connected to two pressure springs (9). The bottom ends of the two pressure springs (9) are fixedly connected to a U-shaped pressure plate (11). Two leveling pre-pressure rollers (10) are rotatably installed on the inner wall of the U-shaped pressure plate (11). Limiting slides (7) are opened on both sides of the testing platform (1), and the two ends of the U-shaped pressure plate (11) extend into the interior of the two limiting slides (7).

6. A visual detector for leather surface flatness according to claim 1, characterized in that: A protective cover (6) is fixedly installed on one side of the testing platform (1), and the drive turntable (14) and the groove wheel (16) are both located inside the protective cover (6).

7. A visual detector for leather surface flatness according to claim 1, characterized in that: The detection host (19) is fixedly installed on one side of the detection station (1).

Images