A visual inspection machine for detecting a lens cut-off line

Abstract

The utility model discloses a kind of visual inspection machines for detecting lens cutoff line, it includes rack;Rack outside cover is equipped with light shield, the top surface of rack is connected with flat plate;The mounting plate fixedly connected on rack is provided above flat plate, vertical downward stepping motor is connected in mounting plate middle part, driving shaft of stepping motor is fixedly connected with the rotating disc that is horizontally arranged, interval is equipped between rotating disc and flat plate, the edge of rotating disc is equipped with multiple annularly evenly distributed placement holes;Light source is connected with the position of the position of one of placement holes directly above on mounting plate, and light source is arranged towards placement hole;The position of light source directly below is equipped with opening on flat plate, light-illuminating plate is arranged below flat plate, and light-illuminating plate is connected in rack with horizontal shape, camera is connected with the position of light-illuminating plate on flat plate bottom surface, and camera is arranged towards light-illuminating plate.The utility model not only can reduce detection cost, still have the advantages that detection efficiency is higher, detection accuracy is higher and application range is wider.

Description

Technical Field

[0001] This utility model relates to the field of automotive glass lens inspection equipment, and in particular to a visual inspection machine for detecting the cut-off line of a lens. Background Technology

[0002] After the lens is manufactured, the differences in the surface shape of the curved surface are difficult to observe with the naked eye. Therefore, it is necessary to conduct optical inspection on the lens, and the lens cutoff line is an important test indicator for optical inspection. The lens cutoff line is a clear light intensity boundary line that exists in the beam distribution after the light is emitted from the lens glass. The two sides of the line are divided into bright area and dark area.

[0003] Lens cut-off line inspection is typically conducted in a dimly lit testing room. During the inspection, a clamping frame is set up in front of the light source to hold the lens. After the lens is manually clamped onto the frame, the light source is turned on, illuminating the back of the lens onto the wall. The presence of blurry or ghosting images on the lens cut-off line on the wall is then observed to determine if there are any defects in the lens's surface shape. However, setting up a testing room is costly, and manually removing and installing lenses from the clamping frame one by one is cumbersome and inefficient.

[0004] Therefore, existing lens cutoff line detection methods suffer from high costs and low detection efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a visual inspection machine for detecting the cut-off line of a lens. This invention not only reduces inspection costs but also has the advantage of high inspection efficiency.

[0006] The technical solution of this utility model is as follows: A visual inspection machine for detecting the cutoff line of a lens includes a frame; a light-blocking plate is connected to the outer side of the frame, and a flat plate is connected to the top surface of the frame; a mounting plate is fixedly connected to the frame above the flat plate, a vertically downward-facing stepper motor is connected to the middle of the mounting plate, a horizontally positioned rotating disk is fixedly connected to the drive shaft of the stepper motor, a gap is provided between the rotating disk and the flat plate, and multiple evenly distributed ring-shaped placement holes are provided on the edge of the rotating disk; a light source facing the placement hole is connected to the mounting plate at a position directly above one of the placement holes; an opening is provided on the flat plate at a position directly below the light source, a light-illuminating plate is horizontally connected to the frame below the flat plate, and a camera facing the light-illuminating plate is connected to the bottom surface of the flat plate.

[0007] In the aforementioned visual inspection machine for detecting the cut-off line of a lens, a condenser cover containing a light source is fixedly connected to the mounting plate, and the condenser cover is arranged vertically toward the opening.

[0008] In the aforementioned visual inspection machine for detecting the cutoff line of a lens, the distance between the bottom end of the condenser cover and the top end of the placement hole is 10-20 mm.

[0009] In the aforementioned visual inspection machine for detecting the cut-off line of a lens, a horizontal drive disk is fixedly connected to the bottom end of the drive shaft of the stepper motor. The edge of the drive disk is provided with a plurality of mounting holes evenly distributed in a ring. Each mounting hole is fitted with a screw that is vertically connected to the rotating disk. Each screw is threaded with two positioning nuts that are respectively tightly attached to the upper and lower sides of the drive disk.

[0010] In the aforementioned visual inspection machine for detecting the cut-off line of a lens, flexible pads are connected to the top surface of the rotating disk at positions corresponding to both sides of each placement hole, and the top surface of each flexible pad is horizontally arranged.

[0011] In the aforementioned visual inspection machine for detecting the cutoff line of a lens, the flexible pad and the rotating disk are detachably connected by a plurality of vertically downward screws, the top surface of each screw being located below the top surface of the flexible pad.

[0012] Compared with existing technologies, this utility model features a mounting plate connected to a frame above a flat plate. A vertically downward-facing stepper motor is attached to the mounting plate, driving a rotating disk to rotate above the flat plate. This causes multiple evenly distributed annular placement holes on the rotating disk to be positioned directly above the openings. Operators simply place the lens downwards into the placement hole (the lens edge has an outward-extending edge that engages with the top of the placement hole when the lens body is inserted). The lens is then stably secured in the placement hole under gravity, making the placement and removal operation more convenient. Furthermore, by offsetting the lens placement position from the opening, the placement and removal operation can be easily accomplished. The inspection process is carried out simultaneously with the opening inspection, greatly improving inspection efficiency. By installing a light-blocking plate on the outside of the frame and a flat plate on the top surface of the frame, a near-dark room space is formed inside the frame. After the light source on the mounting plate emits light, the light passes through the lens on the placement hole and shines downwards from the opening onto the illumination plate inside the frame, thus displaying the lens cutoff line on the illumination plate. After taking a picture of the lens cutoff line with a camera, the image can be analyzed to determine whether there are defects in the lens, thereby enabling OK / NG processing of the lens. Using a frame with a flat plate and a light-blocking plate to replace the inspection room reduces inspection costs.

[0013] In addition, this invention provides a condenser between the mounting plate and the placement hole, with a distance of 10-20mm between the bottom of the condenser and the placement hole. This ensures that the rotating disk can rotate normally to transport the lens while allowing the light from the light source to better illuminate the placement hole and opening directly below, thus ensuring detection accuracy.

[0014] A horizontal drive disk is fixedly connected to a stepper motor. The drive disk has multiple mounting holes evenly distributed in a ring. Each mounting hole contains a screw fixed to the rotating disk. Two positioning nuts are threaded onto the screw and are respectively close to the upper and lower sides of the drive disk. By adjusting the position of the two positioning nuts on each screw, the distance between the rotating disk and the drive disk can be adjusted, that is, the size of the gap between the rotating disk and the plate can be adjusted, which can adapt to the detection of lenses of different specifications.

[0015] By connecting flexible pads on both sides of the top surface of the placement hole, and with the top surface of the flexible pads being horizontal, the stability of the lens when placing it in the placement hole is improved and the edge of the lens is less likely to be damaged. The flexible pads and the rotating disk are connected by multiple vertically downward screws, allowing the flexible pads to be disassembled and replaced. The top surface of the screws is located below the top surface of the flexible pads, making it less likely for the top surface of the hard screws to damage the lens.

[0016] Therefore, this utility model not only reduces testing costs, but also has the advantages of high testing efficiency, high testing accuracy, and wide applicability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a top view of the present invention;

[0019] Figure 3 This is a structural diagram of the flat plate position at the top surface of the frame;

[0020] Figure 4 This is a schematic diagram of the rotating disk.

[0021] The labels in the attached diagram are as follows: 1-frame, 2-light shield, 3-flat plate, 4-mounting plate, 5-stepper motor, 6-rotating disk, 7-spacer, 8-placement hole, 9-light source, 10-opening, 11-illumination plate, 12-camera, 13-focusing cover, 14-drive disk, 16-screw, 17-positioning nut, 18-flexible washer, 19-screw. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0023] Example. A visual inspection machine for detecting the cutoff line of a lens, configured as follows: Figures 1 to 4As shown, the system includes a frame 1; a light-blocking plate 2 is attached to the outer side of the frame 1, and a flat plate 3 is attached to the top surface of the frame 1; a mounting plate 4 is fixedly connected to the frame 1 above the flat plate 3, a stepper motor 5 is connected to the middle of the mounting plate 4 and is positioned vertically downwards, a rotating disk 6 is fixedly connected to the drive shaft of the stepper motor 5 and is positioned horizontally, a gap 7 is provided between the rotating disk 6 and the flat plate 3, and multiple evenly distributed ring-shaped placement holes 8 are provided on the edge of the rotating disk 6; a light source 9 is connected to the mounting plate 4 at a position directly above one of the placement holes 8 and facing the placement hole 8; an opening 10 is provided on the flat plate 3 at a position directly below the light source 9, a light-illuminating plate 11 is horizontally connected to the frame 1 below the flat plate 3, and a camera 12 is connected to the bottom surface of the flat plate 3 and faces the light-illuminating plate 11.

[0024] A focusing cover 13 is fixedly connected to the mounting plate 4, which covers the light source 9. The focusing cover 13 is arranged vertically towards the opening 10. The distance between the bottom of the focusing cover 13 and the top of the placement hole 8 is 10-20mm.

[0025] The bottom end of the drive shaft of the stepper motor 5 is fixedly connected to a horizontal drive disk 14. The edge of the drive disk 14 is provided with a plurality of mounting holes evenly distributed in a ring. Each mounting hole is fitted with a screw 16 that is vertically connected to the rotating disk 6. Each screw 16 is threaded with two positioning nuts 17 that are respectively tightly attached to the upper and lower sides of the drive disk 14.

[0026] Flexible gaskets 18 are connected to the top surface of the rotating disk 6 at positions corresponding to both sides of each placement hole 8. The top surface of each flexible gasket 18 is horizontal. The flexible gaskets 18 and the rotating disk 6 are detachably connected by multiple vertically downward screws 19. The top surface of each screw 19 is located below the top surface of the flexible gasket 18.

[0027] Working principle: The operator places the lens face down on one side of the frame 1 and puts it into the nearest placement hole 8 on the rotating disk 6 (the placement hole 8 is offset from the opening 10). At this time, the main body of the lens fits into the placement hole 8, and the edge of the lens is held by the flexible pads 18 on both sides of the placement hole 8. Then, the stepper motor 5 on the mounting plate 4 drives the drive disk 14 to rotate a certain angle. Since the multiple screws 16 on the rotating disk 6 pass through the mounting holes on the drive disk 14, and the screws 16 are threaded with positioning nuts 17 that are close to the upper and lower sides of the drive disk 14, when the drive disk 14 rotates a certain angle, it can synchronously drive the rotating disk 6 to rotate a certain angle, so that the placement hole 8 containing the lens moves to the next adjacent placement hole 8. At this time, the operator continues to put the lens into the nearest placement hole 8.

[0028] When the placement hole 8 containing the lens is rotated to be directly above the opening 10, the light source 9 is powered on and emits light. The light is focused by the condenser hood 13 and then passes downward through the lens at the placement hole 8 and the opening 10, illuminating the illumination plate 11 inside the frame 1. Then, the camera 12 takes a picture of the illumination plate 11 and transmits the captured image to the display. The presence of defects in the lens curvature is determined based on the lens cutoff line in the image (if the lens cutoff line is blurred or has ghosting, the lens curvature is considered defective; if the lens cutoff line is clear, the lens curvature is considered acceptable; this can be determined by image comparison software or manual observation). A light-blocking plate 2 is connected to the outside of the frame 1, and a flat plate 3 with only the opening 10 is connected to the top surface of the frame 1. The interior of the frame 1 can replace the traditional, relatively dark testing chamber, allowing the lens cutoff line to be clearly displayed on the illumination plate 11. As the rotating disk 6 rotates, the placement hole 8 containing the lens continues to rotate from the opening 10. When it rotates to a specific position before the position for loading and placing the lens, the lens is taken out from the placement hole 8 and then sorted and placed according to the judgment result.

[0029] If the lens thickness specifications to be measured are different, the operator can change the position between the rotating disk 6 and the drive disk 14 by adjusting the position of the two positioning nuts 17 on the screw 16, and change the distance of the gap 7 between the rotating disk 6 and the plate 3, so that the equipment can operate normally.

[0030] When the flexible gasket 18 is damaged and needs to be replaced, the flexible gasket 18 can be removed from the rotating disk 6 by unscrewing the screw 19 on the flexible gasket 18, replacing it with a new flexible gasket 18, and then screwing the screw 19 back on. The top surface of the screw 19 is located below the top surface of the flexible gasket 18, so that the lens will not come into contact with the hard screw 19 and be damaged.

Claims

1. A visual inspection machine for detecting the cutoff line of a lens, comprising a frame (1); characterized in that: A light-blocking plate (2) is attached to the outer side of the frame (1), and a flat plate (3) is attached to the top surface of the frame (1). A mounting plate (4) is fixedly connected to the frame (1) above the flat plate (3). A stepper motor (5) is vertically downward connected to the middle of the mounting plate (4). A rotating disk (6) is fixedly connected to the drive shaft of the stepper motor (5). A gap (7) is provided between the rotating disk (6) and the flat plate (3). Multiple placement holes (8) are evenly distributed in a ring on the edge of the rotating disk (6). A light source (9) facing the placement hole (8) is connected to the mounting plate (4) at a position directly above one of the placement holes (8). An opening (10) is provided on the flat plate (3) at a position directly below the light source (9). A light-illuminating plate (11) is horizontally connected to the frame (1) below the flat plate (3). A camera (12) facing the light-illuminating plate (11) is connected to the bottom surface of the flat plate (3).

2. A visual inspection machine for detecting the cutoff line of a lens according to claim 1, characterized in that: A focusing cover (13) is fixedly connected to the mounting plate (4) to cover the light source (9). The focusing cover (13) is arranged vertically toward the opening (10).

3. A visual inspection machine for detecting the cutoff line of a lens according to claim 2, characterized in that: The distance between the bottom of the focusing cover (13) and the top of the placement hole (8) is 10-20 mm.

4. A visual inspection machine for detecting the cutoff line of a lens according to claim 1, characterized in that: The bottom end of the drive shaft of the stepper motor (5) is fixedly connected to a horizontal drive disk (14). The edge of the drive disk (14) is provided with a number of mounting holes evenly distributed in a ring. Each mounting hole is fitted with a screw (16) that is vertically connected to the rotating disk (6). Each screw (16) is threaded with two positioning nuts (17) that are respectively close to the upper and lower sides of the drive disk (14).

5. A visual inspection machine for detecting the cutoff line of a lens according to claim 1, characterized in that: Flexible pads (18) are connected to the top surface of the rotating disk (6) at the positions on both sides of each placement hole (8), and the top surface of each flexible pad (18) is horizontal.

6. A visual inspection machine for detecting the cutoff line of a lens according to claim 5, characterized in that: The flexible pad (18) and the rotating disk (6) are detachably connected by a plurality of vertically downward screws (19), the top surface of each screw (19) being located below the top surface of the flexible pad (18).

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