A mirror shift type double-sided vision detection device

Abstract

The present application relates to the technical field of visual detection device, especially to a mirror shift type double-sided visual detection device. Its technical scheme comprises a rack, a conveying component and a visual detection component. The conveying component adopts double-sided conveying belt support to make the middle part of the workpiece suspended, and the visual detection component realizes synchronous imaging of the top surface, bottom surface and side surface of the workpiece through upper and lower industrial cameras and mirror reflection. In view of the problem that the mirror surface is easy to be contaminated, leading to misjudgment, the device is provided with a movable protective film covering the mirror surface, and when the initial detection is unqualified, the protective film is driven to move and secondary shooting is performed. Through image difference intelligent discrimination of defects, real defects and stains on the film are effectively distinguished. The present application is also integrated with a spacing adjustment and automatic sorting mechanism, which can complete multi-angle and high-precision detection and sorting in a single process, and has the advantages of high detection efficiency, strong anti-interference ability, good adaptability and the like.

Description

Technical Field

[0001] This invention relates to the field of visual inspection device technology, and in particular to a mirror-shifting double-sided visual inspection device. Background Technology

[0002] In the field of industrial visual inspection, machine vision systems are widely used for automated product quality inspection, enabling rapid identification of product appearance defects through image acquisition and algorithm analysis. Traditional visual inspection devices typically employ single-sided imaging, capturing images of only a single surface of the object. While this can accomplish some inspection tasks, it struggles to meet the demand for high-precision simultaneous inspection of multiple surfaces, such as the top, bottom, and sides. With increasing demands for production efficiency and inspection completeness, dual-sided and even multi-sided synchronous visual inspection technology is gradually becoming the development trend. By introducing mirror-assisted imaging, the effective field of view of a single camera can be expanded without increasing the number of cameras, enabling simultaneous image acquisition from multiple sides of the object and significantly improving inspection efficiency.

[0003] However, the introduction of mirrors also brings new technical challenges. In industrial environments, mirrors are typically arranged at an upward angle to capture lateral information. This orientation makes them highly susceptible to accumulating dust, oil, or scratches, resulting in blurred reflected images or false defect features. These imaging interferences introduced by mirror contamination are easily misjudged by vision systems as product defects, leading to a higher false detection rate and severely impacting the accuracy and reliability of the inspection. Therefore, effectively identifying and eliminating the impact of mirror contamination on image quality while utilizing mirrors to expand the field of view has become a critical issue that urgently needs to be addressed to achieve highly reliable multi-faceted visual inspection. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a mirror-shifting double-sided visual inspection device that achieves multi-angle, dual-sided synchronous visual coverage without increasing the number of cameras, effectively distinguishes between real defects and mirror surface contamination, and significantly improves the accuracy and reliability of inspection.

[0005] The technical solution of the present invention: A mirror-shifting double-sided visual inspection device, comprising a frame, and further comprising:

[0006] The conveying component installed inside the frame includes two support frames slidably installed inside the frame, a conveying mechanism installed on the support frames, a spacing adjustment mechanism for controlling the distance between the two support frames, a transfer mechanism installed on the conveying mechanism, and a separation component for separating defective products.

[0007] The two sets of vision inspection components are mounted on the rack and located on the upper and lower sides of the conveying mechanism. Each vision inspection component includes a specular reflection component, which includes a mirror, a protective film covering the mirror, a transfer mechanism for driving the protective film to move, and a cleaning module for cleaning the protective film.

[0008] Optionally, the vision inspection component also includes an industrial camera fixedly mounted on the frame, with two industrial cameras located on the upper and lower sides of the conveying mechanism. The vision inspection component also includes multiple supplementary lights mounted on the upper and lower sides of the conveying mechanism.

[0009] Optionally, a connecting seat is fixedly installed on the support frame, and the mirror is fixedly connected to the connecting seat. The transfer mechanism includes multiple support rods and a drive rod rotatably installed on the connecting seat. The multiple support rods and the drive rod support and tension the protective film. A first motor is fixedly installed on the connecting seat, and the output shaft of the first motor is coaxially fixedly connected to the drive rod.

[0010] Optionally, the conveying mechanism includes multiple pulleys rotatably mounted on a support frame, with a drive belt mounted on all of the pulleys. A second motor is installed inside the frame, and the output shaft of the second motor is coaxially and fixedly connected to one of the pulleys.

[0011] Optionally, the pulleys on the two support frames are identical, and the two corresponding pulleys are fixedly connected by a telescopic rod.

[0012] Optionally, the spacing adjustment mechanism includes a bidirectional lead screw rotatably mounted inside the frame and a third motor fixedly mounted on the frame. The output shaft of the third motor is coaxially and fixedly connected to the bidirectional lead screw. The two ends of the bidirectional lead screw are provided with threads in opposite directions, and the two support frames are respectively threaded to the two ends of the bidirectional lead screw.

[0013] Optionally, the transfer mechanism includes a plurality of transfer wheels rotatably mounted on a support frame, wherein one of the transfer wheels is linked to one of the pulleys via a first linkage belt, and two adjacent transfer wheels are linked together via a second linkage belt.

[0014] Optionally, the separation assembly includes multiple uprights slidably mounted on a frame, with multiple support frames installed between the multiple uprights. The uprights and support frames together form a placement frame, and a lifting mechanism is installed on the frame to drive the placement frame to move up and down.

[0015] Optionally, the lifting mechanism includes a connecting bar fixedly installed on the placement frame, a drive plate fixedly installed on the connecting bar, and a lead screw rotatably installed inside the frame. The lead screw is threadedly connected to the drive plate. A fourth motor is fixedly installed on the frame, and the output shaft of the fourth motor is coaxially fixedly connected to the lead screw.

[0016] Optionally, there is a gap between two adjacent conveyor wheels, and the upright is located inside the gap between the two adjacent conveyor wheels.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] This application achieves unobstructed synchronous visual inspection of both sides of the workpiece through a structural design supported by conveyor belts on both sides and suspended in the middle. By using mirror reflection to expand the field of view of a single camera, it achieves synchronous imaging of multiple sides, which significantly improves inspection efficiency and coverage.

[0019] Furthermore, by adopting a movable protective film and its re-inspection differential mechanism, it can intelligently distinguish between real defects and mirror stains, greatly reducing the false judgment rate and improving the accuracy and reliability of the system, making it particularly suitable for complex application environments in industrial sites. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a mirror-shifting double-sided visual inspection device.

[0021] Figure 2 This is a schematic diagram of the internal structure of the rack;

[0022] Figure 3 This is a schematic diagram of the conveying component;

[0023] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0024] Figure 5 This is a schematic diagram of the transmission mechanism;

[0025] Figure 6 Schematic diagram of the structure of the vision inspection component Figure 1 ;

[0026] Figure 7 Schematic diagram of the structure of the vision inspection component Figure 2 ;

[0027] Figure 8 Schematic diagram of the mirror reflection component Figure 1 ;

[0028] Figure 9 Schematic diagram of the mirror reflection component Figure 2 ;

[0029] Figure 10 for Figure 9 A magnified view of a section at point B.

[0030] Figure label:

[0031] 1. Rack;

[0032] 2. Conveying components; 21. Support frame; 22. Conveying mechanism; 221. Pulley; 222. Drive belt; 223. Second motor; 224. Telescopic rod; 23. Spacing adjustment mechanism; 231. Bidirectional lead screw; 232. Third motor; 24. Transfer mechanism; 241. Conveyor wheel; 242. First linkage belt; 243. Second linkage belt; 25. Separation assembly; 251. Upright pole; 252. Support frame; 253. Placement rack; 254. Connecting bar; 255. Drive plate; 256. Lead screw; 257. Fourth motor;

[0033] 3. Vision inspection components; 31. Industrial camera; 32. Fill light; 33. Specular reflection components; 331. Connecting base; 332. Mirror; 333. Support rod; 334. Drive rod; 335. Protective film; 336. First motor; 337. Cleaning module;

[0034] 4. Workpiece. Detailed Implementation

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] Example: Figures 1 to 5 As shown, the present invention proposes a mirror-shifting double-sided visual inspection device, including a frame 1 and a conveying component 2 installed inside the frame 1. The conveying component 2 includes two support frames 21 slidably installed inside the frame 1, a conveying mechanism 22 installed on the support frames 21, a spacing adjustment mechanism 23 for controlling the distance between the two support frames 21, a transfer mechanism 24 installed on the conveying mechanism 22, and a separation component 25 for separating defective products.

[0037] Furthermore, the conveying mechanism 22 includes multiple pulleys 221 rotatably mounted on the support frame 21. A transmission belt 222 is mounted on the multiple pulleys 221. The two ends of the workpiece 4 to be inspected will be supported by the transmission belts 222 on both sides, so that the bottom of the workpiece 4 will not be obstructed. The top and bottom sides of the workpiece 4 can be inspected simultaneously, thereby providing an unobstructed shooting field of view for the industrial camera 31 arranged below. It realizes synchronous direct imaging of the bottom and top surfaces of the workpiece 4, achieving efficient double-sided visual inspection. A second motor 223 is installed in the frame 1. The output shaft of the second motor 223 is coaxially fixedly connected to one of the pulleys 221. The second motor 223 can drive the pulley 221 to rotate, which in turn drives the transmission belt 222 to move.

[0038] The pulleys 221 on the two support frames 21 are identical and are fixedly connected by a telescopic rod 224. This allows the transmission belts 222 on both sides to move synchronously, and when different workpieces are being inspected, the position of the support frames 21 on both sides needs to be adjusted, so that effective transmission can be maintained.

[0039] It is worth noting that traditional conveyor belts often completely support the workpiece from the bottom, which seriously hinders the direct imaging of the bottom surface of the workpiece by the bottom vision sensor. This application adopts a transmission belt 222 structure with independent sides and adjustable spacing, so that the middle of the workpiece is suspended, thereby providing the industrial camera 31 in both the upper and lower directions with a completely unobstructed shooting field of view, realizing synchronous and direct imaging of the top and bottom surfaces of the workpiece 4, fundamentally improving the detection efficiency.

[0040] like Figures 2 to 3 As shown, in this embodiment, the spacing adjustment mechanism 23 includes a bidirectional lead screw 231 rotatably mounted inside the frame 1 and a third motor 232 fixedly mounted on the frame 1. The output shaft of the third motor 232 is coaxially and fixedly connected to the bidirectional lead screw 231. The two ends of the bidirectional lead screw 231 are provided with threads in opposite directions. Two support frames 21 are respectively threaded to the two ends of the bidirectional lead screw 231. When the third motor 232 starts, it drives the bidirectional lead screw 231 to rotate, which can make the two support frames 21 move towards each other or away from each other, thereby realizing the precise and flexible adjustment of the support spacing of the conveying mechanism 22, which greatly improves the adaptability of this device to workpieces of different specifications.

[0041] The spacing adjustment mechanism 23 precisely controls the spacing between the two support frames 21, ensuring that workpieces of different sizes can be stably supported and their middle parts remain suspended. The telescopic rod 224 connected to the corresponding pulley 221 ensures that the drive of the two transmission belts 222 remains synchronized during the adjustment of the spacing between the support frames 21, avoiding workpiece deviation, jamming or wear caused by asynchrony, and ensuring the smoothness and reliability of the conveying.

[0042] like Figures 2 to 3 As shown, in this embodiment, the transfer mechanism 24 includes multiple transfer wheels 241 rotatably mounted on the support frame 21. One of the transfer wheels 241 is linked to one of the pulleys 221 through the first linkage belt 242, and two adjacent transfer wheels 241 are linked through the second linkage belt 243, so that the transfer mechanism 24 can obtain power from the transfer mechanism 22 to achieve synchronous operation and jointly ensure the stable transfer of the workpiece at the inspection station.

[0043] like Figure 3 and Figure 4As shown, in this embodiment, the separation component 25 includes multiple uprights 251 slidably mounted on the frame 1, and multiple support frames 252 installed between the uprights 251. When the support frames 252 rise with the uprights 251, they can support the unqualified workpieces 4, causing the workpieces 4 to rise and thus be separated. The uprights 251 and the support frames 252 together constitute the placement frame 253. A lifting mechanism is installed on the frame 1 to drive the placement frame 253 to move up and down. When the vision inspection component 3 determines that a workpiece 4 is unqualified, the lifting mechanism is activated, driving the placement frame 253 to rise. At this time, the support frame 252 extends out from the gap between the adjacent conveyor wheels 241, steadily lifting the unqualified workpiece and separating it from the conveyor line, thereby realizing automatic sorting. This online detection and offline separation mode minimizes the interference with the main production line cycle.

[0044] Furthermore, the lifting mechanism includes a connecting bar 254 fixedly installed on the placement frame 253, a drive plate 255 fixedly installed on the connecting bar 254, and a lead screw 256 rotatably installed inside the frame 1. The lead screw 256 is threadedly connected to the drive plate 255. A fourth motor 257 is fixedly installed on the frame 1. The output shaft of the fourth motor 257 is coaxially fixedly connected to the lead screw 256. By driving the lead screw 256 to rotate through the fourth motor 257, the rotational motion can be converted into a precise linear lifting motion between the drive plate 255 and the placement frame 253, and the separation action is stable and reliable.

[0045] There is a gap between two adjacent conveyor wheels 241, and the upright 251 is located inside the gap between the two adjacent conveyor wheels 241. This will not interfere with the movement of the conveyor wheels 241. This arrangement ensures that the separation component is completely hidden under the conveying plane when not in operation, and can move accurately when in operation without interfering with the transfer mechanism 24.

[0046] Furthermore, the design of the separation component 25 embodies the efficient integration of the inspection and sorting process. When the vision system determines that a workpiece is defective, the control system will instruct the fourth motor 257 to start, which will drive the entire placement rack 253 to be precisely lifted through the lead screw 256. The support frame 252 will rise smoothly from the gap between the conveyor wheels 241, lifting the defective workpiece from the conveyor line and achieving physical isolation. This process does not interfere with the conveyor line, ensuring that qualified products can continue to flow forward, while defective products are temporarily stored on the raised placement rack 253 for subsequent centralized processing.

[0047] like Figures 6 to 10As shown, this embodiment also includes two sets of vision inspection components 3 on the mounting frame 1. The two sets of vision inspection components 3 are located on the upper and lower sides of the conveying mechanism 22. The vision inspection component 3 includes a mirror reflection component 33, which reflects the side image of the workpiece 4 into the field of view of the industrial camera 31, thereby realizing the synchronous visual coverage of multiple sides of the workpiece by a single camera, which significantly improves the amount of information acquired and the inspection efficiency of a single shot.

[0048] The mirror reflection component 33 includes a mirror 332, a protective film 335 covering the mirror 332, a transfer mechanism for driving the movement of the protective film 335, and a cleaning module 337 for cleaning the protective film 335. However, in industrial settings, mirror contamination is a major cause of false defects in vision systems. Therefore, by introducing a movable protective film 335 and its driving mechanism, the mirror can be protected, and the contaminants can be moved along with the protective film 335, thereby altering the imaging.

[0049] Furthermore, the vision inspection component 3 also includes an industrial camera 31 fixedly mounted on the frame 1. Two industrial cameras 31 are located on the upper and lower sides of the conveying mechanism 22. The vision inspection component 3 also includes multiple supplementary lights 32 mounted on the upper and lower sides of the conveying mechanism 22. Through direct shooting by the upper and lower industrial cameras 31 and combined with uniform illumination by the supplementary lights 32, high-definition images of the top and bottom surfaces of the workpiece 4 can be acquired simultaneously. The introduction of the mirror reflection component 33 can effectively expand the field of view for inspection, and through the mirror reflection of the mirror 332, the sides of the workpiece 4 can also be inspected.

[0050] It is worth noting that a connecting seat 331 is fixedly installed on the support frame 21, and the mirror 332 is fixedly connected to the connecting seat 331. The transfer mechanism includes multiple support rods 333 and a drive rod 334 rotatably installed on the connecting seat 331. The multiple support rods 333 and the drive rod 334 support and tension the protective film 335. A first motor 336 is fixedly installed on the connecting seat 331. The output shaft of the first motor 336 is coaxially fixedly connected to the drive rod 334. By moving the drive rod 334 through the first motor 336, the protective film 335 can be moved. If there are stains on the protective film 335, the image of the industrial camera 31 will also change. Therefore, if the inspection fails, the inspection can be carried out again after moving the protective film 335 to determine whether the workpiece 4 itself has defects.

[0051] Specifically, when the system initially determines that workpiece 4 is unqualified, it does not immediately reject it. Instead, it initiates a re-inspection process. The first motor 336 drives the drive rod 334 to rotate, moving the protective film 335 a certain distance. This removes the area where stains might have adhered to the film, allowing the clean area to cover the mirror. Subsequently, the system performs a second image acquisition on the same workpiece 4 and compares the two images before and after the movement.

[0052] If the suspicious feature changes or disappears as the protective film 335 moves, it is determined to be caused by stains on the protective film 335, and the workpiece 4 is actually qualified. If the feature position and shape remain unchanged, it is confirmed to be a real defect of the workpiece 4 itself. This intelligent self-verification mechanism of mirror film movement and secondary difference fundamentally solves the problem of misjudgment caused by mirror contamination. The cleaning module 337 can clean the removed used protective film area for recycling, reducing long-term maintenance costs.

[0053] Working Principle: During operation, the workpiece 4 to be inspected is conveyed to the inspection station by the conveyor component 2. Specifically, the second motor 223 drives the pulley 221 to rotate, causing the two transmission belts 222 on both sides to move synchronously, so that the two ends of the workpiece 4 are supported while the middle is suspended, providing an unobstructed field of view for the upper and lower industrial cameras 31. The spacing adjustment mechanism 23 drives the bidirectional lead screw 231 through the third motor 232, which can adjust the spacing between the two support frames 21 to accommodate workpieces of different sizes. The upper and lower sets of vision inspection components 3 work synchronously. The industrial camera 31 directly photographs the top and bottom surfaces of the workpiece with the assistance of the supplementary light 32. At the same time, the mirror 332 reflects the side image of the workpiece into the camera's field of view, realizing multi-angle synchronous imaging. If the system initially determines that the workpiece is unqualified, the re-inspection process is initiated: the first motor 336 drives the drive rod 334 to rotate, causing the protective film 335 covering the mirror to move, so that the film area that may be attached to the dirt is removed; then the same workpiece is photographed a second time. By comparing the two images, if the suspicious features change as the membrane moves, it is determined to be a stain on the membrane, and the workpiece is qualified; if the features remain unchanged, it is confirmed to be a real defect. Finally, the unqualified workpiece is separated by the fourth motor 257 of the separation assembly 25 driving the lead screw 256 to lift the support frame 252.

[0054] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A mirror-shifting double-sided visual inspection device, comprising a frame (1), characterized in that, Also includes: The conveying component (2) installed inside the frame (1) includes two support frames (21) slidably installed inside the frame (1), a conveying mechanism (22) installed on the support frames (21), a spacing adjustment mechanism (23) for controlling the distance between the two support frames (21), a transfer mechanism (24) installed on the conveying mechanism (22), and a separation component (25) for separating defective products. Two sets of visual inspection components (3) are mounted on the frame (1). The two sets of visual inspection components (3) are located on the upper and lower sides of the conveying mechanism (22). The visual inspection component (3) includes a specular reflection component (33). The specular reflection component (33) includes a mirror (332), a protective film (335) covering the mirror (332), a transfer mechanism for driving the protective film (335) to move, and a cleaning module (337) for cleaning the protective film (335). A connecting seat (331) is fixedly installed on the support frame (21). The mirror (332) is fixedly connected to the connecting seat (331). The transfer mechanism includes multiple support rods (333) and a drive rod (334) rotatably installed on the connecting seat (331). The multiple support rods (333) and the drive rod (334) support and tension the protective film (335). A first motor (336) is fixedly installed on the connecting seat (331). The output shaft of the first motor (336) is coaxially fixedly connected to the drive rod (334). When the system initially determines that workpiece (4) is unqualified, it does not immediately reject it, but instead initiates a re-inspection process. The first motor (336) drives the drive rod (334) to rotate, causing the protective film (335) to move a certain distance, so that the film area that may have been contaminated with dirt is removed, and the clean area covers the front of the mirror. Subsequently, the system performs a second image acquisition on the same workpiece (4), and compares the two images before and after the movement: If the suspicious feature changes or disappears as the protective film (335) moves, it is determined to be caused by stains on the protective film (335), and the workpiece (4) is actually qualified. If the feature position and shape remain unchanged, it is confirmed to be a real defect of the workpiece (4).

2. The mirror-shifting double-sided visual inspection device according to claim 1, characterized in that, The visual inspection component (3) also includes an industrial camera (31) fixedly installed on the frame (1). The two industrial cameras (31) are located on the upper and lower sides of the conveying mechanism (22). The visual inspection component (3) also includes multiple supplementary lights (32) installed on the upper and lower sides of the conveying mechanism (22).

3. The mirror-shifting double-sided visual inspection device according to claim 2, characterized in that, The conveying mechanism (22) includes a plurality of pulleys (221) rotatably mounted on a support frame (21), and a transmission belt (222) is mounted on the plurality of pulleys (221). A second motor (223) is installed inside the frame (1), and the output shaft of the second motor (223) is coaxially and fixedly connected to one of the pulleys (221).

4. The mirror-shifting double-sided visual inspection device according to claim 2, characterized in that, The pulleys (221) on the two support frames (21) are identical, and the two corresponding pulleys (221) are fixedly connected by a telescopic rod (224).

5. The mirror-shifting double-sided visual inspection device according to claim 4, characterized in that, The spacing adjustment mechanism (23) includes a bidirectional lead screw (231) rotatably mounted inside the frame (1) and a third motor (232) fixedly mounted on the frame (1). The output shaft of the third motor (232) is coaxially and fixedly connected to the bidirectional lead screw (231). The two ends of the bidirectional lead screw (231) are provided with threads in opposite directions. The two support frames (21) are respectively threaded to the two ends of the bidirectional lead screw (231).

6. The mirror-shifting double-sided visual inspection device according to claim 5, characterized in that, The transfer mechanism (24) includes a plurality of transfer wheels (241) rotatably mounted on a support frame (21), one of the transfer wheels (241) being linked to one of the pulleys (221) via a first linkage belt (242), and two adjacent transfer wheels (241) being linked via a second linkage belt (243).

7. The mirror-shifting double-sided visual inspection device according to claim 6, characterized in that, The separation assembly (25) includes multiple uprights (251) slidably mounted on the frame (1), and multiple support frames (252) installed between the multiple uprights (251). The uprights (251) and the support frames (252) together constitute a placement frame (253). A lifting mechanism for driving the placement frame (253) to move up and down is installed on the frame (1).

8. The mirror-shifting double-sided visual inspection device according to claim 7, characterized in that, The lifting mechanism includes a connecting bar (254) fixedly installed on the placement frame (253), a drive plate (255) fixedly installed on the connecting bar (254), and a lead screw (256) rotatably installed inside the frame (1). The lead screw (256) is threadedly connected to the drive plate (255). A fourth motor (257) is fixedly installed on the frame (1). The output shaft of the fourth motor (257) is coaxially fixedly connected to the lead screw (256).

9. A mirror-shifting double-sided visual inspection device according to claim 8, characterized in that, There is a gap between two adjacent conveyor wheels (241), and the upright (251) is located inside the gap between the two adjacent conveyor wheels (241).

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