A camera-based dynamic detection device for production appearance defects based on industrial vision

Abstract

This invention discloses a dynamic detection device for camera appearance defects based on industrial vision, comprising a base, a transparent turntable rotatably mounted on the base, an upper vision device fixed to a bracket at a certain distance above the turntable, a side vision device on one side of the turntable, and a lower vision device fixed to the bottom of the base; multiple brackets are distributed circumferentially around the turntable, each bracket having rollers and clamping plates respectively mounted on its upper and lower sides; compared with the prior art, this invention achieves efficient, accurate, and automated dynamic detection of camera appearance defects, and has outstanding advantages such as comprehensive detection dimensions, high centering accuracy, strong adaptability to production changes, and stable and reliable operation.

Description

Technical Field

[0001] This invention relates to the field of visual inspection technology, specifically a dynamic detection device for appearance defects in industrial vision-based camera production. Background Technology

[0002] Dome cameras (such as dome security cameras, vehicle-mounted panoramic cameras, fisheye surveillance cameras, etc.) are widely used in security monitoring, intelligent transportation, autonomous driving and other fields due to their wide field of view, concealed installation and excellent protection performance.

[0003] Currently, the industry mainly uses the following methods for appearance inspection and assembly accuracy assessment of hemispherical cameras: Static multi-station planar visual inspection, which involves setting up multiple fixed camera stations on the production line. The top camera captures the top area of ​​the dome, the bottom camera captures the bottom surface of the base, and the side cameras capture one or two fixed side angles. This method is effective for planar defects, but for hemispherical curved surfaces, the side fixed cameras can only capture a narrow annular area, failing to cover the entire side contour from the dome to the base. This makes it easy to miss defects in the lower part of the dome and at the joints (such as shrinkage marks and burrs at the joint lines). Furthermore, multiple repositionings between different stations are required, and changes in camera posture introduce measurement errors.

[0004] Using mechanical hard positioning and rigid fixtures for alignment, V-grooves, sizing jaws, or contour blocks are used to forcibly limit the base and dome of a hemispherical camera before the camera takes pictures. This type of fixture cannot automatically adapt to hemispherical products with different diameters or curvatures; the entire fixture set must be replaced during product changes, which is time-consuming. More importantly, rigid clamping cannot sense contact force. When the hemispherical lens itself has roundness deviations or the base is slightly deformed, the fixture will still forcibly push the product into a fixed position, resulting in: deformation or even scratches on the dome surface due to pressure; inability to determine the true concentricity of the base and lens, potentially masking assembly misalignment issues; and inability to quantitatively output concentricity deviation values, with assembly accuracy relying solely on offline sampling inspection.

[0005] Therefore, it is necessary to provide a dynamic detection device for appearance defects in industrial vision-based cameras to solve the problems mentioned in the background art. Summary of the Invention

[0006] To achieve the above objectives, the present invention provides the following technical solution: a dynamic detection device for appearance defects in camera production based on industrial vision, comprising a base, a transparent turntable rotatably disposed on the base, an upper vision device fixed to a bracket disposed at a certain distance above the turntable, a side vision device disposed on one side of the turntable, and a lower vision device fixed to the bottom of the base. The turntable is surrounded by multiple supports, and each support has a roller and a clamp at the top and bottom, respectively.

[0007] Furthermore, each of the brackets is provided with a slide rail fixed to the base below it, and the bracket is slidably disposed in the slide rail.

[0008] Furthermore, a toothed ring is rotatably provided on the edge of the base, and each bracket is hinged to the toothed ring via a connecting rod.

[0009] Furthermore, a servo-driven screw is rotatably mounted on one side of the base, and the screw meshes with a gear ring.

[0010] Furthermore, the base is equipped with a servo-driven drive wheel, which is connected to the turntable via a belt.

[0011] Furthermore, the clip is slidably connected to the bracket, and a first elastic sensor is provided between the clip and the bracket.

[0012] Furthermore, the rollers on each bracket are arranged in pairs and rotatably mounted at the ends of two V-shaped connecting rods, which are hinged to a connecting rod, which is in turn hinged to the bracket.

[0013] Furthermore, a second elastic sensor is installed between the two rollers in the same group.

[0014] Furthermore, a connecting block is slidably disposed in the bracket above the connecting rod, and the connecting block is hinged to the connecting rod via a push rod.

[0015] Furthermore, a lead screw is rotatably disposed in the bracket, and the lead screw is threadedly connected to the connecting block.

[0016] Compared with the prior art, the beneficial effects of the present invention are: In this invention, by combining the upper vision device, the side vision device, and the lower vision device, along with a self-rotating transparent turntable, it is possible to simultaneously or sequentially acquire 360° complete images of the upper surface, lower surface, and sides of the camera product. This enables full coverage inspection of all external surfaces of the camera, including the housing, lens, screen printing, connectors, and sealing rings, avoiding the problem of missed inspections caused by the lack of viewing angle in traditional inspection methods.

[0017] In this invention, a radially synchronous sliding support structure is adopted, combined with clamping plates and a V-shaped roller assembly, which can automatically push the camera mount and lens to the center position. The first and second elastic sensors monitor the contact force in real time, which can not only ensure uniform clamping force and avoid damage to the product, but also determine the centering deviation by the difference in the values ​​of the sensors at each station and issue an alarm, thereby ensuring that each camera is in the standard posture before inspection, which greatly improves the repeatability and reliability of the inspection results.

[0018] When the clamp contacts the camera mount, the values ​​of the first elastic sensors at each station reflect the offset of the camera mount center relative to the theoretical centering position; simultaneously, the values ​​of the second elastic sensors on each set of V-rollers reflect the positional deviation of the lens center. By comparing the measured force distribution of all first elastic sensors and the force distribution of the second elastic sensors under the same camera, the system can calculate the relative offset between the camera mount center and the lens center, thus quantitatively determining their concentricity deviation. When the concentricity exceeds a set threshold, it can be determined that the camera has an assembly misalignment problem (such as lens pressing misalignment, mount installation tilt, etc.).

[0019] In this invention, the bracket can slide radially along the slide rail, and the tilt angle of the roller assembly can be independently adjusted by the lead screw and push rod, allowing the radial position and clamping angle of the clamping plate and rollers to quickly adapt to camera products of different diameters and heights. Multi-product mixed-line production can be achieved without changing mechanical fixtures, significantly reducing changeover time and equipment costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a camera-based dynamic detection device for appearance defects in industrial vision production. Figure 2 A side view diagram of a camera-based dynamic detection device for appearance defects in industrial vision production. Figure 3 This is a schematic diagram of the structure of the bracket of the present invention; Figure 4 This is a top view of the clip structure of the present invention; Figure 5 This is a top view of the structure of the roller of the present invention; In the diagram: 1. Base; 2. Turntable; 3. Upper vision device; 4. Side vision device; 5. Lower vision device; 6. Bracket; 61. Slide rail; 62. Connecting rod; 7. Clamping plate; 71. First elastic sensor; 8. Roller; 81. Connecting block; 82. Connecting rod; 83. Connecting rod; 84. Push rod; 85. Lead screw; 86. Second elastic sensor; 9. Ring light; 10. Gear ring; 11. Screw; 12. Belt; 13. Drive wheel. Detailed Implementation

[0021] Please see Figures 1-5 In this embodiment of the invention, a dynamic detection device for camera production appearance defects based on industrial vision includes a base 1, a transparent turntable 2 rotatably disposed on the base 1, an upper vision device 3 fixed to a bracket 1 disposed at a certain distance above the turntable 2, a side vision device 4 disposed on one side of the turntable 2, and a lower vision device 5 fixed to the bottom of the base 1. The turntable 2 is surrounded by multiple supports 6, and each support 6 is provided with a roller 8 and a clamp 7 at the top and bottom respectively.

[0022] The camera mount can be clamped by the clip 7, and the camera lens can be clamped by the roller 8, thereby achieving centering. The upper vision device 3, the side vision device 4, and the lower vision device 5 can respectively detect the upper, side, and lower surfaces of the camera to identify camera defects.

[0023] In this embodiment, each of the brackets 6 is provided with a slide rail 61 fixed to the base 1 below it, and the bracket 6 is slidably disposed in the slide rail 61.

[0024] The radial position of the clip 7 and roller 8 can be changed by the sliding bracket 6 to accommodate cameras of different specifications.

[0025] In this embodiment, a toothed ring 10 is rotatably provided on the edge of the base 1, and each of the brackets 6 is hinged to the toothed ring 10 through a connecting rod 62.

[0026] By rotating the gear ring 10, each bracket 6 can be driven to slide radially synchronously, thereby ensuring that the clamping plate 7 and the roller 8 are clamped evenly.

[0027] In this embodiment, a servo-driven screw 11 is rotatably mounted on one side of the base 1, and the screw 11 meshes with the gear ring 10.

[0028] In other words, the screw 11 can drive the gear ring 10 to rotate, thereby clamping or releasing the camera by the clamping plate 7 and the roller 8, and the screw 11 drive has a self-locking effect to ensure the stability of the position of the gear ring 10.

[0029] In this embodiment, a servo-driven drive wheel 13 is provided on the base 1, and the drive wheel 13 is connected to the turntable 2 via a belt 12.

[0030] The drive wheel 13 can drive the turntable 2 to rotate, so that the camera on the turntable 2 can rotate after the clip 7 and roller 8 are removed, so that the side vision device 4 can detect the side of the camera.

[0031] In this embodiment, the clip 7 is slidably connected to the bracket 6, and a first elastic sensor 71 is provided between the clip 7 and the bracket 6.

[0032] The first elastic sensor 71 ensures that the clip 7 fits flexibly with the camera mount, and the difference between each first elastic sensor 71 can determine whether the camera mount is aligned.

[0033] In this embodiment, the rollers 8 on each bracket 6 are arranged in pairs and rotate at the ends of two V-shaped connecting rods 82. The two connecting rods 82 are hinged to a connecting rod 83, which is in turn hinged to the bracket 6.

[0034] In this embodiment, a second elastic sensor 86 is provided between the two rollers 8 in the same group.

[0035] The second elastic sensor 86 enables the two rollers 8 in the V-shaped link 82 to move away from each other when subjected to pressure, achieving flexible fit, and the difference between each second elastic sensor 86 can determine whether the camera lens is aligned.

[0036] In this embodiment, a connecting block 81 is slidably disposed in the bracket 6 above the connecting rod 83, and the connecting block 81 is hinged to the connecting rod 83 by a push rod 84; A lead screw 85 is rotatably mounted in the bracket 6, and the lead screw 85 is threadedly connected to the connecting block 81.

[0037] In other words, by rotating the lead screw 85, the height of the connecting block 81 can be adjusted, thereby causing the push rod 84 to push the connecting rod 83 to rotate to different angles, thus causing the two rollers 8 to tilt at different angles to accommodate cameras of different specifications.

[0038] In practice, a manual or automated feeding robot places the camera on the transparent turntable 2, positioning it in the central area between a set of clamping plates 7 and rollers 8. The drive screw 11 rotates, pushing the gear ring 10 to rotate. Through the connecting rod 62, all supports 6 move radially towards the center of the turntable along the slide rail 61. The clamping plates 7 first abut against the bottom edge of the camera mount. The first elastic sensor 71 monitors the contact force in real time. When the values ​​of the first elastic sensors at all stations reach the preset threshold, it indicates that the camera mount is properly aligned and the difference between them is within the allowable range. The camera mount is then determined to be aligned. The two V-shaped rollers 8 simultaneously press against the outer circle of the camera lens. The second elastic sensor 86 detects the pressure difference between each set of rollers 8. When the pressure difference approaches zero and the sensor values ​​at each station are stable, the lens is determined to be aligned. If the difference between the first elastic sensor 71 or the second elastic sensor 86 exceeds the set range, the system issues an alarm, prompting manual intervention or automatic rejection of the camera. After clamping and centering, screw 11 rotates turntable 2 in the opposite direction to move bracket 6 away from camera. Upper vision device 3 captures images of the top surface of camera, such as lens cap, silkscreen, and decorative ring; lower vision device 5 captures images of the bottom surface of camera through transparent turntable 2, such as connector, solder pad, and sealing ring; side vision device 4 captures images of a certain initial angle of the side of camera, such as the USB interface side. Servo drive wheel 13 is activated, which drives turntable 2 to rotate at a constant speed through belt 12. Camera rotates with turntable, and side vision device 4 continuously captures images at a fixed frame rate. Every time turntable rotates once, the system stitches together a complete 360° image of the side of camera. Each vision system transmits the images to industrial control computer, which detects defects such as scratches, dirt, burrs, shrinkage, missing glue, and character errors based on deep learning or traditional algorithms.

[0039] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dynamic detection device for appearance defects in industrial vision production using a camera, comprising a base (1), characterized in that, A transparent turntable (2) is rotatably mounted on the base (1). An upper vision device (3) is fixed to the bracket (1) at a certain distance above the turntable (2). A side vision device (4) is mounted on one side of the turntable (2). A lower vision device (5) is fixed to the bottom of the base (1). The turntable (2) is surrounded by multiple supports (6), and each support (6) is provided with a roller (8) and a clamp (7) on the top and bottom respectively.

2. The dynamic detection device for appearance defects in industrial vision production using a camera, as described in claim 1, is characterized in that... Each of the brackets (6) is provided with a slide rail (61) fixed to the base (1) below it, and the bracket (6) is slidably disposed in the slide rail (61).

3. The dynamic detection device for appearance defects in industrial vision production using a camera, as described in claim 2, is characterized in that... The base (1) has a toothed ring (10) rotatably arranged on its edge, and each bracket (6) is hinged to the toothed ring (10) by a connecting rod (62).

4. The dynamic detection device for appearance defects in industrial vision production using a camera, as described in claim 3, is characterized in that... A servo-driven screw (11) is rotatably mounted on one side of the base (1), and the screw (11) meshes with the gear ring (10).

5. The dynamic detection device for appearance defects in industrial vision production using a camera, as described in claim 1, is characterized in that... The base (1) is provided with a servo-driven drive wheel (13), which is connected to the turntable (2) via a belt (12).

6. The dynamic detection device for production appearance defects based on industrial vision using a camera, as described in claim 1, is characterized in that... The clip (7) is slidably connected to the bracket (6), and a first elastic sensor (71) is provided between the clip (7) and the bracket (6).

7. The dynamic detection device for appearance defects in industrial vision production using a camera, as described in claim 1, is characterized in that... The rollers (8) on each bracket (6) are arranged in pairs at the ends of two V-shaped connecting rods (82), which are hinged to a connecting rod (83) which is also hinged to the bracket (6).

8. The dynamic detection device for appearance defects in industrial vision production using a camera, as described in claim 7, is characterized in that... A second elastic sensor (86) is provided between the two rollers (8) in the same group.

9. The dynamic detection device for appearance defects in industrial vision production using a camera, as described in claim 7, is characterized in that... A connecting block (81) is slidably disposed in the bracket (6) above the connecting rod (83), and the connecting block (81) is hinged to the connecting rod (83) by a push rod (84).

10. A dynamic detection device for production appearance defects based on industrial vision using a camera, as described in claim 9, characterized in that, A lead screw (85) is rotatably disposed in the bracket (6), and the lead screw (85) is threadedly connected to the connecting block (81).

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