Workpiece defect visual inspection device adopting multi-angle light source

Abstract

The invention relates to the field of workpiece detection, and discloses a workpiece defect visual detection device adopting a multi-angle light source, which comprises a fixed frame, a supporting assembly and a multi-angle detection assembly, the supporting assembly comprises a roller support, a first roller, a second roller, a rotating power module and a tail supporting piece, the roller support is slidably installed on the fixing frame, and the sliding direction of the roller support is parallel to the axis of the first roller; the first roller and the second roller are arranged on the roller bracket and are matched with a tail supporting piece arranged on the fixed frame to support a workpiece to be measured in a three-point manner; according to the multi-angle detection assembly, at least two moving modules arranged on the multi-angle detection assembly are used for driving an illumination module and a camera module arranged on the moving modules to illuminate and shoot the surface of a to-be-detected workpiece, so that the to-be-detected workpiece does not need to be manually taken in the detection process of the detection device, images and evidences are reserved while surface defect detection of the to-be-detected workpiece is completed, and the detection efficiency is improved. Therefore, the problem that the appearance detection of the to-be-detected workpiece depends on manpower in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of workpiece inspection, and in particular to a visual inspection device for workpiece defects using a multi-angle light source. Background Technology

[0002] In high-end manufacturing, products typically undergo visual inspection before being put into storage, including checking for appearance defects and ensuring that accessories are properly installed. Currently, this inspection is often done manually, but the existing method has two problems. First, there are no image records after the inspection, making subsequent traceability difficult; second, some products are large and heavy, making it challenging for manual inspection of their complete appearance. Summary of the Invention

[0003] The purpose of this invention is to provide a visual inspection device for workpiece defects using multi-angle light sources, which solves the problem that the appearance inspection of workpieces under test in the prior art relies on manual labor.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: In a first aspect, the present invention discloses a workpiece defect visual inspection device using a multi-angle light source, comprising a fixing frame, a support assembly, and a multi-angle detection assembly; The support assembly includes a roller bracket, a first roller, a second roller, a rotation power module, and a tail support. The roller bracket is slidably mounted on the fixed frame, and the sliding direction of the roller bracket is parallel to the axis of the first roller. The first roller and the second roller are arranged opposite to each other on the first fixed end and the second fixed end of the roller bracket, and the axes of the first roller and the second roller are parallel. The rotation power module provides power for the rotation of the first roller and the second roller. The workpiece to be tested is placed between the first roller and the second roller. The tail support for fixing the tail of the workpiece to be tested is arranged on the fixed frame. The first roller, the second roller, and the tail support are arranged in a "T" shape. The multi-angle detection component includes at least two moving modules, at least two illumination modules, and at least two camera modules. The illumination modules illuminate the surface of the workpiece to be tested, and the angles between the at least two illumination modules and the surface of the workpiece to be tested are different. The camera modules take pictures of the surface of the workpiece to be tested, and the angles between the at least two camera modules and the surface of the workpiece to be tested are different. The moving end of the moving module drives the illumination modules and the camera modules to move along the axial direction of the first roller.

[0005] As an optional embodiment, the first fixed end and the second fixed end of the support assembly are both slidably mounted on the roller bracket. The first fixed end and the second fixed end slide on the horizontal surface of the roller bracket, and the sliding direction of the first fixed end and the second fixed end is perpendicular to the axis of the first roller.

[0006] As an optional solution, a drive module is also provided on the roller bracket; The drive module includes a first telescopic end and a second telescopic end, which are respectively connected to the first fixed end and the second fixed end. The first telescopic end drives the first fixed end to slide, and the second telescopic end drives the second fixed end to slide. The first telescopic end and the second telescopic end extend and retract synchronously.

[0007] As an optional solution, the rotational power module includes a servo motor and a synchronous belt; The output shaft of the servo motor is connected to the first roller via a synchronous belt drive.

[0008] As an optional solution, at least one moving module, lighting module and camera module are arranged above the workpiece to be tested, and the moving module, lighting module and camera module located above the workpiece to be tested constitute the first detection module. At least one of the illumination module and camera module is arranged on the side of the workpiece to be tested, and the optical axes of the illumination module and camera module both point to the workpiece to be tested. The moving module, illumination module and camera module located on the side of the workpiece to be tested constitute a second detection module.

[0009] As an optional solution, the moving module located in the first detection module is the first moving module, and the moving module located in the second detection module is the second moving module; The first moving module includes a first guide rail and a first slider. The guide trajectory of the first guide rail is parallel to the axis of the first roller. An illumination module and a camera module located in the first detection module are mounted on the first slider. The second moving module includes a second guide rail and a second slider. The guide trajectory of the second guide rail is parallel to the axis of the first roller. The second slider is equipped with an illumination module and a camera module located in the second detection module. As an optional solution, the illumination module located in the first detection module is the first illumination module, and the illumination module located in the second detection module is the second illumination module; The first illumination module includes a first light source and a first light source mounting bracket. The fixed end of the first light source mounting bracket is fixedly connected to the first slider, and the first light source is mounted on the mounting end of the first light source mounting bracket. The first light source illuminates the workpiece to be tested from above. The second illumination module includes a second light source and a second light source mounting bracket. The fixed end of the second light source mounting bracket is fixedly connected to the second slider. The second light source is mounted on the mounting end of the second light source mounting bracket. The optical axis of the second light source is coaxial with the axis of the workpiece to be tested. The second light source illuminates the workpiece to be tested from the side.

[0010] As an optional solution, the camera module located in the first detection module is the first camera module, and the camera module located in the second detection module is the second camera module; The first camera module includes a first industrial camera and a first camera mounting bracket. The fixed end of the first camera mounting bracket is fixedly connected to the first slider. The first industrial camera is mounted on the mounting end of the first camera mounting bracket. The first industrial camera takes pictures of the surface of the workpiece to be measured from above. The second camera module includes a second industrial camera and a second camera mounting bracket. The fixed end of the second camera mounting bracket is fixedly connected to the second slider. The second industrial camera is mounted on the mounting end of the second camera mounting bracket. The second industrial camera takes pictures of the surface of the workpiece to be measured from the side.

[0011] As an optional solution, a control component is also included, which includes a host computer and a controller; The signal output terminal of the host computer is electrically connected to the signal input terminal of the controller, and the host computer sends control signals to the controller. The signal output terminal of the controller is electrically connected to the signal input terminals of the rotation power module, the movement module, the illumination module, and the camera module. The controller controls the working timing of the rotation power module, the movement module, the illumination module, and the camera module.

[0012] As an optional solution, the detection device also includes at least one safety light curtain; The safety light curtain is mounted on a fixed frame, and the working end of the safety light curtain covers the area where the workpiece to be tested is located. The signal output terminal of the safety light curtain is connected to the signal input terminal of the host computer. When the safety light curtain detects that a person has entered the area where the workpiece to be tested is located, the safety light curtain sends a signal to the host computer, and the host computer sends a stop working command to the controller.

[0013] The present invention has the following unexpected beneficial effects: 1. The detection device of the present invention is provided with a support assembly and a multi-angle detection assembly. The support assembly uses a first roller, a second roller and a tail support to complete the three-point support of the workpiece to be tested, thereby realizing the automatic exposure of the 360° circumferential surface of the workpiece to be tested, laying the foundation for comprehensive detection.

[0014] The roller bracket in the support assembly for mounting the first roller and the second roller is slidably mounted on the fixed frame, thereby enabling the detection device of the present invention to fix workpieces of different lengths by sliding the roller bracket.

[0015] The multi-angle detection component uses lighting modules and camera modules with different angles to simultaneously illuminate and capture images of the workpiece from multiple directions, thereby effectively eliminating reflections, shadows, and blind spots caused by single-angle lighting, and significantly improving the detection rate of defects such as cracks and scratches.

[0016] The moving module drives the illumination module and camera module to slide along the axis of the first roller, and the workpiece to be tested is supported by the first roller, the second roller, and the tail support, which enables the illumination module and the camera module to move along the axis of the workpiece to be tested under the drive of the moving module. This achieves full-length scanning detection of the workpiece to be tested, taking into account both comprehensiveness and the compactness of the device structure, thereby solving the problem of relying on manual labor for the appearance inspection of the workpiece to be tested in the prior art.

[0017] 2. The detection device of the present invention has a first fixed end and a second fixed end for fixing the first roller and the second roller slidably mounted on the fixed frame, so that the first fixed end and the second fixed end can move laterally to flexibly adjust the wheel distance between the two rollers, thereby more stably and firmly supporting and rotating workpieces of different diameters, thereby reducing the specialization of the equipment and improving the cost performance and production line flexibility. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of a workpiece defect visual inspection device using a multi-angle light source according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the working process of the workpiece defect visual inspection device using multi-angle light source according to an embodiment of the present invention; Figure 3 This is an embodiment of the present invention. Figure 2 A magnified view of a section at point A; Figure 4 This is an exploded view of the support assembly of the workpiece defect visual inspection device using a multi-angle light source according to an embodiment of the present invention; Figure 5 This is an exploded view of the first detection module of the workpiece defect visual inspection device using a multi-angle light source according to an embodiment of the present invention. Figure 6 This is an exploded view of the first detection module of the workpiece defect visual inspection device using a multi-angle light source according to an embodiment of the present invention. Figure 7 This is a top view of the support assembly of the workpiece defect visual inspection device employing a multi-angle light source according to an embodiment of the present invention; In the diagram, 1 is a fixed frame; 101 is a sliding rod; 2 is a support assembly; 201 is a roller bracket; 202 is a first roller; 203 is a second roller; 204 is a rotation power module; 2041 is a servo motor; 2042 is a synchronous belt; 205 is a tail support; 3 is a multi-angle detection assembly; 301 is a first detection module; 3011 is a first moving module; 3011a is a first guide rail; 3011b is a first slider; 3012 is a first illumination module; 3012a is a first light source; 3012b is the mounting of the first light source. 3013, First camera module; 3013a, First industrial camera; 3013b, First camera mounting bracket; 302, Second detection module; 3021, Second moving module; 3021a, Second guide rail; 3021b, Second slider; 3022, Second illumination module; 3022a, Second light source; 3022b, Second light source mounting bracket; 3023, Second camera module; 3023a, Second industrial camera; 3023b, Second camera mounting bracket; 4, Safety light curtain; 5, Workpiece to be tested. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this invention, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] In one embodiment, such as Figures 1 to 7 As shown, in a first aspect, the present invention provides a workpiece defect visual inspection device using a multi-angle light source, including a fixing frame 1, a support assembly 2, and a multi-angle detection assembly 3.

[0023] The support assembly 2 includes a roller bracket 201, a first roller 202, a second roller 203, a rotation power module 204, and a tail support 205.

[0024] The fixed frame 1 is provided with a slide rod 101, and the roller bracket 201 is slidably mounted on the fixed frame 1 via the slide rod 101. The rod body of the slide rod 101 is parallel to the axis of the first roller, so the sliding direction of the roller bracket 201 is parallel to the axis of the first roller 202.

[0025] The first roller 202 and the second roller 203 are arranged opposite to each other on the first fixed end and the second fixed end of the roller bracket 201, and the axes of the first roller 202 and the second roller 203 are parallel. The rotation power module 204 provides power for the rotation of the first roller 202 and the first roller 203. The workpiece 5 to be tested is placed between the first roller 202 and the second roller 203. The tail support 205 for fixing the tail of the workpiece 5 to be tested is arranged on the fixed frame 1. The first roller 202, the second roller 203 and the tail support 205 are arranged in a "T" shape. The workpiece 5 to be tested is supported by the first roller 202, the second roller 203 and the tail support 205 at three points. At this time, the axis of the workpiece 5 to be tested is a, the axis of the first roller 202 is b, the contact surface between the tail support 205 and the workpiece 5 to be tested is α, a∥b and a⊥α.

[0026] The tail support 205 includes a support base, two small rollers, screws, and a limiting plate. The support base is fixedly installed on the fixing frame 1. The two small rollers are installed on the upper mounting end of the support base. The tail of the workpiece 5 to be tested is placed in the gap between the two small rollers, and the tail of the workpiece 5 to be tested abuts against the end face of the limiting plate. The limiting plate is connected to the support base by the screws. At this time, the end face of the limiting plate that abuts against the workpiece 5 to be tested is the contact surface c between the tail support 205 and the workpiece 5 to be tested. The end face of the workpiece 5 to be tested is in contact with the end faces of the first roller 202 and the second roller 203. The workpiece 5 to be tested is fixed in the working area of ​​the multi-angle detection component 3 by the first roller 202, the second roller 203, and the tail support 205, which are arranged in a "T" shape.

[0027] The multi-angle detection component 3 includes at least two moving modules, at least two illumination modules, and at least two camera modules. The illumination modules illuminate the surface of the workpiece 5 to be tested, and the angles between the at least two illumination modules and the surface of the workpiece 5 to be tested are all different. The camera modules take pictures of the surface of the workpiece 5 to be tested, and the angles between the at least two camera modules and the surface of the workpiece 5 to be tested are all different. The moving end of the moving module drives the illumination modules and the camera modules to move along the axial direction of the first roller 202.

[0028] The number of lighting modules and camera modules installed on the moving module is not further limited here. A moving module can be equipped with only one lighting module or one camera module. In this case, the operator can accurately adjust the angle between any camera module or any lighting module and the surface of the workpiece 5 to be tested, thereby obtaining more accurate detection data. A moving module can be equipped with both a lighting module and a camera module. In this case, compared with the previous arrangement, the number of moving modules is reduced, the production line cost is reduced, and the camera module and the lighting module installed on the same moving module can only move synchronously. This makes the angle between the camera module and the lighting module and the working surface always remain relatively constant, thereby ensuring that the camera module can always identify the light illuminating the workpiece 5 to be tested by the corresponding lighting module, avoiding the need to recalibrate the corresponding camera module and lighting module every time the moving module is adjusted.

[0029] Based on this, the support assembly 2 described in this invention includes a roller bracket 201, a first roller 202, a second roller 203, a rotation power module 204, and a tail support member 205. The first roller 202 and the second roller 203 are respectively mounted on the roller bracket 201, and the roller bracket 201 is slidably mounted on the fixed frame 1. As the first roller 202 and the second roller 203 slide away from or towards the tail support member 205 set on the fixed frame 1, they always form a "T" shape with it, thereby forming a three-point support for the workpiece 5 to be tested placed between the first roller and the second roller, thus achieving a firm support for workpieces 5 of different specifications. At this time, the multi-angle detection assembly 3 uses at least two moving modules, at least two lighting modules, and at least two camera modules set therein to illuminate and photograph the surface of the workpiece 5 to be tested from multiple angles, thereby completing the surface defect detection of the workpiece 5 to be tested and taking photos as evidence, thus solving the problem of the prior art relying on manual inspection of the appearance of the workpiece 5 to be tested.

[0030] Furthermore, such as Figures 1 to 7 As shown, the first and second fixed ends of the support assembly 2 are slidably mounted on the roller bracket 201. The first and second fixed ends slide on the horizontal surface of the roller bracket 201, and the sliding directions of the first and second fixed ends are perpendicular to the axis of the first roller 202. The first and second fixed ends move closer to or further away from each other during the sliding process, so that the support assembly 2 can flexibly adjust the distance between the two rollers by moving laterally. This allows the detection device to more firmly and stably support and rotate workpieces 5 of different diameters, reducing the specialization of the equipment and improving the cost-effectiveness and production line flexibility.

[0031] Furthermore, such as Figures 1 to 7 As shown, a drive module is also provided on the roller bracket 201.

[0032] The drive module includes a first telescopic end and a second telescopic end, which are respectively connected to the first fixed end and the second fixed end. The first telescopic end drives the first fixed end to slide, and the second telescopic end drives the second fixed end to slide. The first telescopic end and the second telescopic end extend and retract synchronously.

[0033] The specific extension and retraction method of the drive module is not further limited here. The drive module can be implemented using a screw and two threaded connecting blocks. In this case, the first extension end and the second extension end are two threaded connecting blocks, each with a threaded hole, and the threads on the two connecting blocks have different directions. The screw connects to the two threaded connecting blocks simultaneously through the two threaded holes. When the operator rotates the screw clockwise or counterclockwise, the two threaded connecting blocks achieve synchronous displacement in opposite directions, thereby realizing the synchronous extension and retraction of the first extension end and the second extension end. The drive module can also directly use existing double-finger cylinders with differential hydraulic cylinder design or double pushrod structure (such as SC, Festo). (Cylinders of the DHPS series, etc.) The first telescopic end and the second telescopic end are the two telescopic ends of the double-finger cylinder. The telescopic ends of the double-finger cylinder with differential hydraulic cylinder design or double-finger rod structure have synchronous telescopic function. Therefore, the drive module not only realizes the automatic adjustment of the distance between the rollers through pneumatic means, but also ensures that the two rollers always remain aligned during the adjustment process, further eliminating jamming or deviation of the workpiece 5 caused by asynchronous telescopic extension, thereby ensuring the stability of the rotation center of the workpiece 5.

[0034] Furthermore, such as Figures 1 to 7 As shown, the rotation power module 204 includes a servo motor 2041 and a synchronous belt 2042.

[0035] The output shaft of the servo motor 2041 is connected to the first roller 202 via a synchronous belt 2042. At this time, the first roller 202 acts as a driving wheel and the second roller 203 acts as a driven wheel. The first roller 202 drives the workpiece 5 to rotate, and the second roller 203 rotates along with the workpiece 5.

[0036] The arrangement of the first roller 202 and the second roller 203 ensures that the two rollers can rotate synchronously, which not only protects the surface of the workpiece 5 under test from being scratched during the inspection process, but also ensures that the rotation angle of the workpiece 5 under test is precisely synchronized with the camera shooting trigger signal, which helps with subsequent image stitching and accurate defect positioning.

[0037] Furthermore, such as Figures 1 to 7 As shown, at least one moving module, lighting module and camera module are arranged above the workpiece 5 to be tested, and the moving module, lighting module and camera module located above the workpiece 5 to be tested constitute the first detection module 301. At least one of the illumination module and camera module is arranged on the side of the workpiece 5 to be tested, and the optical axes of the illumination module and camera module both point to the workpiece 5 to be tested. The moving module, illumination module and camera module located on the side of the workpiece 5 to be tested constitute the second detection module 302.

[0038] At this time, the first detection module 301 is mainly responsible for detecting the top surface, upper side surface and upward complex surface features of the workpiece 5 under test; the second detection module 302 (whose optical axis points to the workpiece 5 under test) is mainly responsible for detecting the radial vertical surface of the workpiece 5 under test; for example, for an engine turbine disk, the core aerodynamic curved surfaces such as the blade basin and blade back of its blades are facing the side camera. This station can obtain the best observation angle with positive and no perspective distortion, and discover micro-cracks, coating peeling and other defects in these key areas to the greatest extent.

[0039] This simultaneous illumination and imaging from multiple stations at distinct angles creates a complete optical information model of the workpiece 5 under test, ensuring that one or more stations can clearly highlight the defect regardless of its orientation, thus completely solving the blind spot problem in non-manual inspection.

[0040] Furthermore, such as Figures 1 to 7 As shown, the moving module located in the first detection module 301 is the first moving module 3011, and the moving module located in the second detection module 302 is the second moving module 3021.

[0041] The first moving module 3011 includes a first guide rail 3011a and a first slider 3011b. The guide trajectory of the first guide rail 3011a is parallel to the axis of the first roller 202. The first slider 3011b is equipped with an illumination module and a camera module located in the first detection module 301.

[0042] The second moving module 3021 includes a second guide rail 3021a and a second slider 3021b. The guide trajectory of the second guide rail 3021a is parallel to the axis of the first roller 202. The second slider 3021b is equipped with an illumination module and a camera module located in the second detection module 302.

[0043] Since the guide rail itself is the core component of high-precision linear motion, when the first moving module 3011 and the second moving module 3021 move the illumination module and camera module mounted on it by means of the guide rail and slider, they can ensure the stability, straightness and positioning accuracy of the corresponding illumination module and camera module during the scanning movement. This stable and vibration-free movement also enables the illumination module and the camera module to obtain high-quality, motion-blur-free images, which directly improves the reliability and accuracy of the signals detected by the detection device.

[0044] Furthermore, such as Figures 1 to 7 As shown, the illumination module located in the first detection module 301 is the first illumination module 3012, and the illumination module located in the second detection module 302 is the second illumination module 3022.

[0045] The first illumination module 3012 includes a first light source 3012a and a first light source mounting bracket 3012b. The fixed end of the first light source mounting bracket 3012b is fixedly connected to the first slider 3011b, and the first light source 3012a is mounted on the mounting end of the first light source mounting bracket 3012b. The first light source 3012a illuminates the workpiece 5 to be tested from above.

[0046] The second illumination module 3022 includes a second light source 3022a and a second light source mounting bracket 3022b. The fixed end of the second light source mounting bracket 3022b is fixedly connected to the second slider 3021b. The second light source 3022a is mounted on the mounting end of the second light source mounting bracket 3022b. The optical axis of the second light source 3022a is coaxial with the axis of the workpiece 5 to be tested. The second light source 3022a illuminates the workpiece 5 to be tested from the side.

[0047] Because the light source mounting bracket allows for fine-tuning of the angle, direction, and position of the light source mounted on it, the operator can adjust the illumination angles of the first light source 3012a and the second light source 3022a respectively for the surface of the workpiece 5 under test with different curvatures. This ensures that both the first illumination module 3012 and the second illumination module 3022 can illuminate the specific area with the optimal incident angle, thereby most effectively "highlighting" defect features (such as making scratches produce a bright edge effect) and "suppressing" interfering reflections, providing the camera with the optimal original light signal, and thus ensuring the adjustability and adaptability of the illumination module.

[0048] Furthermore, such as Figures 1 to 7 As shown, the camera module located in the first detection module 301 is the first camera module 3013, and the camera module located in the second detection module 302 is the second camera module 3023.

[0049] The first camera module 3013 includes a first industrial camera 3013a and a first camera mounting bracket 3013b. The fixed end of the first camera mounting bracket 3013b is fixedly connected to the first slider 3011b, and the first industrial camera 3013a is mounted on the mounting end of the first camera mounting bracket 3013b. The first industrial camera 3013a captures images of the surface of the workpiece 5 to be tested from above.

[0050] The second camera module 3023 includes a second industrial camera 3023a and a second camera mounting bracket 3023b. The fixed end of the second camera mounting bracket 3023b is fixedly connected to the second slider 3021b. The second industrial camera 3023a is mounted on the mounting end of the second camera mounting bracket 3023b. The second industrial camera 3023a captures images of the surface of the workpiece 5 to be measured from the side.

[0051] Because the camera mounting bracket allows for fine adjustment of the viewing angle, focal length, shooting distance, and level of the camera mounted on it, it ensures that both the first industrial camera 3013a and the second industrial camera 3023a can adjust their shooting angles according to their positions. This, in turn, ensures that both the first camera module 3013 and the second camera module 3023 can acquire the clearest, most accurately focused, and most correctly angled images according to their specific detection angles and workstations, thereby providing high-quality, distortion-free, and reliable input data for subsequent image processing algorithms.

[0052] Furthermore, this embodiment, which is not shown in the accompanying drawings, also includes a control component, which includes a host computer and a controller.

[0053] The signal output terminal of the host computer is electrically connected to the signal input terminal of the controller. The host computer sends control signals to the controller. The host computer is an industrial PC or a touch screen. At this time, the host computer provides a human-machine interface for the detection device, so that the operator can set various detection parameters (such as rotation speed, scanning path, light intensity, etc.) and monitor the entire detection process through the host computer.

[0054] The signal output terminal of the controller is electrically connected to the signal input terminals of the rotation power module 204, the movement module, the illumination module, and the camera module. The controller controls the working timing of the rotation power module 204, the movement module, the illumination module, and the camera module.

[0055] The controller sends start signals, rotation angle signals, and stop signals to the rotation power module 204; the controller sends start signals, displacement distance signals, and stop signals to the movement module; the controller sends start signals, rotation angle signals, and stop signals to the illumination module and camera module; the controller is a PLC, and in this case, the controller acts as an execution unit. After receiving instructions from the host computer, it can accurately drive the actions of each underlying module (rotation power module 204, movement module, illumination module, and imaging module), thereby achieving precise control and timing synchronization between the rotation angle of the workpiece under test, the camera's shooting timing, the light source triggering time, and the scanning axis movement position. This allows the detection device to acquire a series of continuous frames that can be used for subsequent panoramic image stitching. While providing evidence during the detection process, it avoids inconsistencies in rhythm caused by manual operation, ensuring the consistency of each detection process, and thus making the detection results highly repeatable and comparable.

[0056] Furthermore, such as Figures 1 to 7 As shown, the detection device also includes at least one safety light curtain 4.

[0057] The safety light curtain 4 is mounted on the fixed frame 1, and the working end of the safety light curtain 4 covers the area where the workpiece 5 to be tested is located.

[0058] The signal output terminal of the safety light curtain 4 is connected to the signal input terminal of the host computer. When the safety light curtain 4 detects that a person has entered the area where the workpiece 5 is to be tested, the safety light curtain 4 sends a signal to the host computer, and the host computer sends a stop working command to the controller.

[0059] From the perspective of preventing safety accidents, the safety light curtain 4 forms an invisible "light wall" in the working area; once any part of the hand or body of a person (such as an operator or maintenance personnel) enters the danger zone (near rotating and moving parts), the system will immediately stop all movement (stop the rotation of the rollers and stop the moving modules), thereby effectively preventing mechanical injury accidents; similarly, foreign objects that accidentally enter will also trigger a shutdown, preventing foreign objects from colliding with precision and expensive testing equipment (such as industrial cameras and lenses) or the workpiece 5 under test, causing damage to the equipment or the workpiece 5 under test.

[0060] From the perspective of the component inspection system, the addition of the safety light curtain 4 enables the inspection device to form a complete safety closed-loop control chain: sensor (safety light curtain 4) -> decision center (host computer) -> actuator (controller stops output); this constitutes a safety interlock system that meets safety standards, greatly increasing the market acceptance and practicality of the device.

[0061] The workflow of this invention is as follows: The on-site operator first places the main body of the workpiece 5 to be tested between the first roller 202 and the second roller 203, and then fixes the tail of the workpiece 5 to be tested through the tail support block, so that the workpiece 5 to be tested can be firmly placed in the working area of ​​the multi-angle detection component 3. When it is necessary to detect the obscured surface of the workpiece 5 to be tested, the rotation power module 204 is started and drives the first roller 202 and the second roller 203 to rotate. The illumination module in the multi-angle module irradiates the workpiece 5 with detection light for detecting defects on the surface of the workpiece. The camera module captures the image of the surface of the workpiece 5 after being irradiated by the detection light. The moving module drives the illumination module and the camera module to move along the detection trajectory (the relevant values ​​are calculated in advance by the technicians, which can be controlled by manual on-site operation or by automatic control by PLC). The image information finally presented by the camera module is used as the basis for judging whether there are defects on the surface of the workpiece 5 to be tested.

[0062] In summary, the detection device redesigns the support structure for placing the workpiece 5 under test. The first roller 202, the second roller 203, and the tail support 205 work together to support the workpiece 5. This allows the support structure to not only support the workpiece 5 but also rotate it in conjunction with the multi-angle detection component 3, enabling direct detection of its entire surface. While using the camera module to record the relevant detection sequence, the operation is automated through the rotation power module 204 and the movement module. This avoids the problems of relying on manual inspection of the workpiece's complete appearance and the difficulty in obtaining evidence in the original program, thus solving the problem of manual inspection of workpiece appearance in the prior art.

[0063] It should be understood that the terms "first," "second," etc., are used in this invention to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A visual inspection device for workpiece defects using a multi-angle light source, characterized in that, Includes a fixing frame (1), a support assembly (2), and a multi-angle detection assembly (3); The support assembly (2) includes a roller bracket (201), a first roller (202), a second roller (203), a rotation power module (204), and a tail support (205). The roller bracket (201) is slidably mounted on the fixed frame (1), and the sliding direction of the roller bracket (201) is parallel to the axis of the first roller (202). The first roller (202) and the second roller (203) are arranged opposite to each other on the first fixed end and the second fixed end of the roller bracket (201), and the first roller (202) is slidably mounted on the fixed frame (1). The axes of the first roller (202) and the second roller (203) are parallel. The rotation power module (204) provides power for the spin of the first roller (202) and the second roller (203). The workpiece (5) to be tested is placed between the first roller (202) and the second roller (203). The tail support (205) for fixing the tail of the workpiece (5) to be tested is set on the fixed frame (1). The first roller (202), the second roller (203) and the tail support (205) are arranged in a "T" shape. The multi-angle detection component (3) includes at least two moving modules, at least two illumination modules and at least two camera modules. The illumination modules illuminate the surface of the workpiece (5) to be tested, and the angles between the at least two illumination modules and the surface of the workpiece (5) to be tested are different. The camera modules take pictures of the surface of the workpiece (5) to be tested, and the angles between the at least two camera modules and the surface of the workpiece (5) to be tested are different. The moving end of the moving module drives the illumination module and the camera module to move along the axial direction of the first roller (202).

2. The detection device according to claim 1, characterized in that, The first fixed end and the second fixed end of the support assembly (2) are both slidably mounted on the roller bracket (201). The first fixed end and the second fixed end slide on the horizontal surface of the roller bracket (201), and the sliding direction of the first fixed end and the second fixed end is perpendicular to the axis of the first roller (202).

3. The detection device according to claim 2, characterized in that, The roller bracket (201) is also equipped with a drive module; The drive module includes a first telescopic end and a second telescopic end, which are respectively connected to the first fixed end and the second fixed end. The first telescopic end drives the first fixed end to slide, and the second telescopic end drives the second fixed end to slide. The first telescopic end and the second telescopic end extend and retract synchronously.

4. The detection device according to claim 1, characterized in that, The rotational power module (204) includes a servo motor (2041) and a synchronous belt (2042); The output shaft of the servo motor (2041) is connected to the first roller (202) via a synchronous belt (2042).

5. The detection device according to claim 1, characterized in that, At least one moving module, lighting module and camera module are arranged above the workpiece to be tested (5), and the moving module, lighting module and camera module located above the workpiece to be tested (5) form the first detection module (301); At least one of the illumination module and camera module is arranged on the side of the workpiece to be tested (5), and the optical axes of the illumination module and camera module both point to the workpiece to be tested (5). The moving module, illumination module and camera module located on the side of the workpiece to be tested (5) constitute the second detection module (302).

6. The detection device according to claim 5, characterized in that, The moving module located in the first detection module (301) is the first moving module (3011), and the moving module located in the second detection module (302) is the second moving module (3021); The first moving module (3011) includes a first guide rail (3011a) and a first slider (3011b). The guide trajectory of the first guide rail (3011a) is parallel to the axis of the first roller (202). The first slider (3011b) is equipped with an illumination module and a camera module located in the first detection module (301). The second moving module (3021) includes a second guide rail (3021a) and a second slider (3021b). The guide trajectory of the second guide rail (3021a) is parallel to the axis of the first roller (202). The second slider (3021b) is equipped with an illumination module and a camera module located in the second detection module (302).

7. The detection device according to claim 6, characterized in that, The illumination module located in the first detection module (301) is the first illumination module (3012), and the illumination module located in the second detection module (302) is the second illumination module (3022); The first illumination module (3012) includes a first light source (3012a) and a first light source mounting bracket (3012b). The fixed end of the first light source mounting bracket (3012b) is fixedly connected to the first slider (3011b), and the first light source (3012a) is mounted on the mounting end of the first light source mounting bracket (3012b). The first light source (3012a) illuminates the workpiece (5) to be tested from above. The second illumination module (3022) includes a second light source (3022a) and a second light source mounting bracket (3022b). The fixed end of the second light source mounting bracket (3022b) is fixedly connected to the second slider (3021b). The second light source (3022a) is mounted on the mounting end of the second light source mounting bracket (3022b), and the optical axis of the second light source (3022a) is coaxial with the axis of the workpiece (5) to be tested. The second light source (3022a) illuminates the workpiece (5) to be tested from the side.

8. The detection device according to claim 6, characterized in that, The camera module located in the first detection module (301) is the first camera module (3013), and the camera module located in the second detection module (302) is the second camera module (3023); The first camera module (3013) includes a first industrial camera (3013a) and a first camera mounting bracket (3013b). The fixed end of the first camera mounting bracket (3013b) is fixedly connected to the first slider (3011b). The first industrial camera (3013a) is mounted on the mounting end of the first camera mounting bracket (3013b). The first industrial camera (3013a) takes pictures of the surface of the workpiece (5) to be tested from above. The second camera module (3023) includes a second industrial camera (3023a) and a second camera mounting bracket (3023b). The fixed end of the second camera mounting bracket (3023b) is fixedly connected to the second slider (3021b). The second industrial camera (3023a) is mounted on the mounting end of the second camera mounting bracket (3023b). The second industrial camera (3023a) takes pictures of the surface of the workpiece (5) to be tested from the side.

9. The detection device according to claim 1, characterized in that, It also includes a control component, which includes a host computer and a controller; The signal output terminal of the host computer is electrically connected to the signal input terminal of the controller, and the host computer sends control signals to the controller; The signal output terminal of the controller is electrically connected to the signal input terminals of the rotation power module (204), the movement module, the illumination module and the camera module, and the controller controls the working timing of the rotation power module (204), the movement module, the illumination module and the camera module.

10. The detection device according to claim 9, characterized in that, The detection device also includes at least one safety light curtain (4); The safety light curtain (4) is mounted on the fixed frame (1), and the working end of the safety light curtain (4) covers the area where the workpiece (5) to be tested is located; The signal output terminal of the safety light curtain (4) is connected to the signal input terminal of the host computer. When the safety light curtain (4) detects that a person has entered the area where the workpiece (5) is to be tested, the safety light curtain (4) sends a signal to the host computer, and the host computer sends a stop working command to the controller.

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