Product appearance visual inspection device

Abstract

The utility model relates to the technical field of visual inspection, in particular to a product appearance visual inspection device. The irradiation path of the light source assembly intersects with the table top of the objective table, the acquisition path of the camera intersects with the table top of the objective table, the light source assembly comprises an irradiation lamp and a grid assembly which are sequentially arranged along the irradiation path, and the grid assembly comprises a grid plate and light holes formed in the grid plate. A bright and dark field is formed on the objective table. According to the utility model, the structure is simple, the cost is low, the manufactured bright and dark fields have high contrast, and the accuracy of appearance detection is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of visual inspection, in particular to a product appearance visual inspection device. Background Art

[0002] Product appearance inspection is one of the main operations before a product leaves the factory. With the development of the times, visual inspection devices composed of cameras have gradually replaced traditional manual inspection.

[0003] In order to ensure the accuracy of the detection of cracks and bulges on the product appearance, most of the existing appearance detection devices use a programmable light source as the illumination light source to form a light and dark field on the surface of the product to be detected that is convenient for identifying bulges and cracks. As recorded in the text of the Chinese patent publication number CN219201417U entitled A Curved Mirror Detection Mechanism, a programmable surface light source is used as the illumination light source, and the surface light source is divided into different areas. The on and off state and brightness display of each area can be controlled by a program. However, in actual implementation, the programmable light source needs to set a specific program control, which has the problems of high cost and cumbersome logical setting. In addition, the way the programmable light source creates the light and dark field is through the different illumination brightness between adjacent areas. In fact, the illumination of the light sources in adjacent areas will interfere with each other, resulting in unsatisfactory contrast between the light and dark fields, and ultimately leading to insufficient accuracy in appearance detection, so it is urgent to solve the problem. Utility Model Content

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a product appearance visual inspection device with a simple structure and low cost, and the light and dark fields produced have a high contrast, which effectively improves the accuracy of appearance inspection.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A product appearance visual inspection device includes a stage, a light source assembly whose illumination path intersects with the stage surface, and a camera whose collection path intersects with the stage surface. The light source assembly includes illumination lamps and a grid assembly arranged in sequence along the illumination path. The grid assembly includes a grid plate and light-transmitting holes opened on the grid plate to form bright and dark fields on the stage.

[0007] As a further solution of the present invention: the grid plates are arranged to be distributed in sequence in a direction perpendicular to the grid plate surface, and all the grid plates can be slidably offset, so that the grid assembly has an initial state in which the light-transmitting holes of all the grid plates correspond one to one and an adjustment state in which the light-transmitting holes of several grid plates are slidably offset, so that the light-transmitting holes between adjacent grid plates can be adjusted back and forth between being offset from each other and overlapping with each other.

[0008] As a further scheme of the utility model: the grid plate is slidably matched on the track frame, and the track frame is fixedly connected with the base of the irradiation lamp.

[0009] As a further scheme of the utility model: the table top of the object table is horizontally arranged, the light source assembly is arranged directly above the object table, and the irradiation path of the light source assembly is distributed along the vertical direction; the lens of the camera is horizontally arranged, and a mirror is arranged on the front side of the lens, and the object table, the mirror and the lens of the camera form a light reflection path therebetween, and the light reflection path constitutes the collection path of the camera.

[0010] As a further scheme of the utility model: the base is further provided with a slide rail parallel to the lens axis of the camera, a stand column is slidably matched on the slide rail, and the stand column is locked with the slide rail through a locking screw; the stand column comprises a first stand column and a second stand column distributed on both sides of the object table, and the camera and the mirror are respectively installed on the first stand column and the second stand column.

[0011] As a further scheme of the utility model: the camera and the mirror are slidably matched on the first stand column and the second stand column along the vertical direction respectively, and the camera and the mirror are locked and fixed with the stand column through the locking screw.

[0012] As a further scheme of the utility model: the inclination angle of the mirror is adjustable.

[0013] As a further scheme of the utility model: the light source assembly is slidably matched on the second stand column along the vertical direction, and the light source assembly is locked and matched with the stand column through the locking screw.

[0014] As a further scheme of the utility model: the base is provided with a lifter for driving the object table to be lifted and adjusted.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] 1. The grid plate is used to block light to form a bright-dark field, without the need to set a complex control program in the light source, so that the structure is simple and the cost is low.

[0017] 2. The grid panels are arranged in a sequence of at least two, perpendicular to the grid panel surface. All grid panels are slidably offset to allow the light holes between adjacent grid components to be adjusted between offset and overlap. Compared with using a programmable area light source to control the change of bright and dark field structure through program control, this has the advantages of simple structure, low cost and convenient operation.

[0018] 3. The camera lens is arranged horizontally, and it uses mirror reflection to achieve image acquisition. Compared with the method of directly using the tilted acquisition path of the camera to intersect with the stage, it can avoid the problem of local imaging blur caused by the focus not being on the same horizontal plane due to the tilt, and at the same time avoid interference between the lens and the light source component. It has the advantages of more reasonable design and clearer and more stable imaging.

[0019] 4. The distance between the camera and the reflector is adjustable. The camera's acquisition position and focusing distance on the stage can be adjusted according to the camera's imaging acquisition requirements.

[0020] 5. It has the function of adjustable acquisition range. The acquisition range of the camera can be adjusted by adjusting the stage up and down, or by adjusting the camera and the reflector synchronously. The specific acquisition range is easy to adjust and has the advantage of a wide adjustment range.

[0021] 6. A mechanical light intensity adjustment mechanism is used, and the light source component is raised and lowered on the second column to adjust the illumination intensity of the stage surface. It has the advantages of convenient illumination intensity adjustment range and a wider adjustment range. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the present utility model.

[0023] Figure 2 This is a schematic diagram of the main structure of the present utility model.

[0024] Figure 3 It is a schematic diagram of the top structure of the utility model.

[0025] Figure 4 It is a structural schematic diagram of the grid component in the utility model.

[0026] In the figure: 10, stage; 20, camera; 30, base; 31, slide rail; 32, lifter; 40, light source assembly; 41, irradiation lamp; 42, grid assembly; 421, track frame; 422, grid plate; 50, reflector; 60, column; 60a, first column; 60b, second column; 70, set screw. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] For ease of understanding, the specific structure and working mode of the present invention are further described below in conjunction with the accompanying drawings: Figure 1-4 As shown, its main structure includes a stage 10, a light source assembly 40 whose illumination path intersects with the surface of the stage 10, and a camera 20 whose collection path intersects with the surface of the stage 10. Among them, the light source assembly 40 includes an illumination lamp 41 and a grid assembly 42 arranged in sequence along the illumination path, and the grid assembly 42 includes a grid plate 422 and a light-transmitting hole opened on the grid plate 422 to form a bright and dark field on the stage 10. The grid plate 422 is used to block the light to form a bright and dark field, and there is no need to set up a complex control program in the light source, so the structure is simple and the cost is low. In addition, compared with the programmable surface light source, there will be mutual interference between the strong light field and the weak light field. In this application, the light is blocked by the plate body of the grid, and the interference between the light that passes through the light-transmitting hole and the light that cannot pass through the light-transmitting hole is small. The bright and dark field finally formed has a more obvious contrast, so that the detection of small cracks and bumps is more accurate.

[0029] Further, such as Figure 4 As shown, the grid plates 422 are arranged in a sequence of at least two arranged perpendicular to the surface of the grid plates 422, and all of the grid plates 422 are slidably offset from each other, so that the light-transmitting holes between adjacent grid plates 422 can be adjusted back and forth between offsetting and overlapping. Specifically, in the initial state, all of the light-transmitting holes overlap when viewed from above; in the adjustment state, some or all of the light-transmitting holes are offset, thereby adjusting the light-transmitting area of ​​the grid assembly 42, thereby adjusting the grid structure that forms the bright and dark fields, thereby further accurately detecting defects such as bump deformation. Compared with using a programmable surface light source to program the changes in the bright and dark field structure, this method has the advantages of simple structure, low cost, and convenient operation.

[0030] Specifically, such as Figure 1As shown, the grid plate 422 is slidingly fitted on the track frame 421, and the track frame 421 stably supports the grid plate 422. In addition, the track frame 421 is fixedly connected with the base of the irradiation lamp 41, and the grid plate 422 and the irradiation lamp 41 are synchronously adjusted to provide a technical platform for adjusting the irradiation intensity of the light on the table top 10. In specific implementation, the light transmission holes can be in a long hole structure and arranged in a dot matrix on the grid plate 422. In addition, the track frame 421 is provided with a sliding groove along the length direction of the light transmission hole, and the grid plate 422 is in the sliding groove of the track frame 421. Specifically, along the length direction of the sliding groove, the distance between adjacent light transmission holes is 1 mm, and according to the adjustment range of the light transmission hole required by the grid assembly 42, different numbers of grid plates 422 are arranged. For example, if the adjustment range is 1 mm, two grid plates 422 are arranged; if the adjustment range is 2 mm, three grid plates 422 are arranged.

[0031] On the basis of the above, due to the arrangement of the grid assembly 42 in the present application, the grid assembly 42 is difficult to be coaxially arranged with the camera 20, and the arrangement mode of the table top 10, the light source assembly 40 and the camera 20 is optimized. Specifically, as shown in Figure 1 and Figure 2 The table top 10 is horizontally arranged, the light source assembly 40 is arranged directly above the table top 10, and the irradiation path of the light source assembly 40 is distributed along the vertical direction. The lens of the camera 20 is horizontally arranged, and the front side of the lens is provided with a reflector 50. The table top 10, the reflector 50 and the lens of the camera 20 form a light reflection path, and the light reflection path constitutes the collection path of the camera 20. In the present application, the lens of the camera 20 is horizontally arranged, and the lens realizes pattern collection by reflecting the light through the reflector 50. Compared with the method of directly using the inclined collection path of the camera 20 to intersect with the table top 10, the present application can avoid the problem of local image blur caused by the focus not being in the same horizontal plane due to the inclination, and can also avoid the interference between the lens and the light source assembly 40. The design is more reasonable, and the image is clearer and more stable.

[0032] Further, as shown in Figure 1As shown, the base 30 is fixed with the slide rail 31 which is parallel to the lens axis of the camera 20, the slide rail 31 is slidingly fitted with the column 60, and the column 60 is locked with the slide rail 31 through the set screw 70; the column 60 includes the first column 60a and the second column 60b which are distributed on both sides of the object table 10, and the camera 20 and the mirror 50 are respectively installed on the first column 60a and the second column 60b. After the first column 60a or the second column 60b slides on the slide rail 31, and then is locked by the set screw 70, the distance adjustment between the camera 20 and the mirror 50 can be realized, so that the collection position of the camera 20 on the object table 10 and the focusing distance can be adjusted according to the imaging collection requirements of the camera 20. Specifically, the mirror 50 moves towards the side of the camera 20, the collection position moves towards the side of the camera 20, and the focusing distance is shortened; on the contrary, the mirror 50 moves away from the side of the camera 20, the collection position moves away from the side of the camera 20, and the focusing distance is increased; in addition, the camera 20 can also be moved to adjust the position of the mirror 50, in this way, the collection position is fixed, but the focusing distance is shortened or increased.

[0033] In addition, as shown in FIG. 4, Figure 2 As shown, the camera 20 and the mirror 50 are slidingly fitted on the first column 60a and the second column 60b along the vertical direction respectively, and the camera 20 and the mirror 50 are locked and fixed with the column 60 by the set screw 70. By synchronous lifting adjustment of the camera 20 and the mirror 50, the collection range of the camera 20 can be adjusted, for example, the camera 20 and the mirror 50 move upwards, the collection range is increased, and the camera 20 and the mirror 50 move downwards, the collection range is reduced.

[0034] In addition, as shown in FIG. 4, Figure 2 As shown, the angle of the mirror 50 can be adjusted. By adjusting the angle of the mirror 50, the fine adjustment of the collection position and the collection range can also be realized on the basis of ensuring clear imaging.

[0035] In addition, as shown in FIG. 4, Figure 2 As shown, the light source assembly 40 is slidingly fitted on the second column 60b along the vertical direction, and the light source assembly 40 is locked and fitted with the column 60 by the set screw 70, so that the lifting adjustment of the light source assembly 40 can be realized, and then the irradiation intensity on the table surface of the object table 10 is adjusted.

[0036] As shown in FIG. 4, Figure 1 As shown, the base 30 is installed with the lifter 32 which drives the object table 10 to lift and adjust, and the collection range of the camera 20 can also be adjusted by the lifting adjustment of the object table 10.

[0037] Of course, the utility model is not limited to the details of the above exemplary embodiments for those skilled in the art, and also includes the same or similar structures that can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

[0039] The technical, shape, structure parts not described in detail in the utility model are well-known technologies.

Claims

1. A product appearance visual inspection device, comprising a stage (10), a light source assembly (40) whose illumination path intersects with the surface of the stage (10), and a camera (20) whose collection path intersects with the surface of the stage (10), characterized in that: The light source assembly (40) includes an irradiation lamp (41) and a grid assembly (42) arranged in sequence along an irradiation path. The grid assembly (42) includes a grid plate (422) and a light-transmitting hole opened on the grid plate (422) to form a bright and dark field on the stage (10).

2. A product appearance visual inspection device according to claim 1, characterized in that: The grid plates (422) are arranged to be at least two and distributed in sequence along a direction perpendicular to the surface of the grid plates (422), and all the grid plates (422) can be slidably displaced so that the light-transmitting holes between adjacent grid plates (422) can be adjusted back and forth between being displaced and overlapping with each other.

3. A product appearance visual inspection device according to claim 2, characterized in that: The grid plate (422) is slidably fitted on the track frame (421), and the track frame (421) is fixedly connected to the base of the irradiation lamp (41).

4. A product appearance visual inspection device according to claim 1, 2 or 3, characterized in that: The table top of the stage (10) is arranged horizontally, the light source assembly (40) is arranged directly above the stage (10), and the illumination path of the light source assembly (40) is distributed along the vertical direction; the lens of the camera (20) is arranged horizontally, and a reflector (50) is arranged on the front side of the lens, and a light reflection path is formed between the stage (10), the reflector (50) and the lens of the camera (20), and the light reflection path constitutes the collection path of the camera (20).

5. A product appearance visual inspection device according to claim 4, characterized in that: The invention also includes a base (30), a slide rail (31) parallel to the lens axis of the camera (20) is fixed on the base (30), a column (60) is slidably matched on the slide rail (31), and the column (60) is locked with the slide rail (31) by a set screw (70); the column (60) includes a first column (60a) and a second column (60b) distributed on both sides of the stage (10), and the camera (20) and the reflector (50) are respectively mounted on the first column (60a) and the second column (60b).

6. A product appearance visual inspection device according to claim 5, characterized in that: The camera (20) and the reflector (50) are respectively slidably fitted on the first column (60a) and the second column (60b) in the vertical direction, and the camera (20) and the reflector (50) are locked and fixed to the column (60) by a set screw (70).

7. A product appearance visual inspection device according to claim 6, characterized in that: The inclination angle of the reflector (50) is adjustable.

8. The product appearance visual inspection device according to claim 5, characterized in that: The light source assembly (40) is slidably fitted on the second column (60b) in the vertical direction, and the light source assembly (40) is locked and fitted with the column (60) by a set screw (70).

9. The product appearance visual inspection device according to claim 5, characterized in that: The base (30) is provided with a lifter (32) for driving the loading platform (10) to move up and down.

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