CN113945581A - Mirror-like workpiece defect detector - Google Patents
Mirror-like workpiece defect detector Download PDFInfo
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- CN113945581A CN113945581A CN202111021465.1A CN202111021465A CN113945581A CN 113945581 A CN113945581 A CN 113945581A CN 202111021465 A CN202111021465 A CN 202111021465A CN 113945581 A CN113945581 A CN 113945581A
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- 238000001514 detection method Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
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Abstract
The invention provides a mirror-like workpiece defect detector which is used for detecting surface defects of a mirror-like workpiece and comprises an annular light source arranged above the mirror-like workpiece, an annular grating arranged between the annular light source and the mirror-like workpiece and used for light to pass through and irradiate the mirror-like workpiece, a shooting device arranged above the annular light source and a driving device used for driving the mirror-like workpiece to move, wherein the shooting device is coaxially arranged with the annular grating and the annular light source. The detector for detecting the surface defects of the mirror-like workpieces has the advantages of low cost, simple structure, no deformation of collected images, high identification efficiency and wide application prospect in detecting the surface defects of the mirror-like workpieces.
Description
Technical Field
The invention relates to a mirror-like workpiece defect detector.
Background
In the manufacturing industry, mirrors or mirror-like surfaces are widely used in the surfaces of various products, such as mobile phone and computer housings, automobile bodies, glass panels, and the like. In the production and manufacturing process, surface defects of the mirror-like products are often accompanied, and how to detect the surface defects of the mirror surface or the mirror-like object is an important work for ensuring the quality and the service performance of the mirror surface or the mirror-like product.
The traditional detection method mainly depends on manual visual inspection, and the method has the defects of long time consumption, low detection rate, high possibility of being influenced by manpower, high damage to human eyes and the like, and is difficult to meet the increasingly modern industrial detection. Meanwhile, the method for realizing the defect re-detection of the three-dimensional surface reconstruction by adopting different means has the defects of expensive equipment, complex operation, high requirement on environment and the like. The modern industry has an increasing demand for detecting surface defects of mirror surfaces or mirror-like surfaces, and the detection of the surface defects not only can control the quality of products, but also can feed back the quality to a production line in time for tracing improvement, thereby providing powerful data support for improving the quality of the products.
In a device adopting a fringe projection method, light emitted by a light source is obliquely incident on a mirror-like surface, a camera is placed along the position of mirror-like reflection light, although the device can detect the defect of the surface of an object, the image acquired by the camera often has deformation, and meanwhile, the micro defect cannot be detected due to the reason of the acquisition angle, so that the device which has a simple structure and low cost, does not deform the image in the acquisition process, and can efficiently and accurately detect the mirror-like surface defect is urgently needed.
In view of the above, there is a need to improve the defect detecting apparatus for mirror-like workpieces in the prior art to solve the above problems.
Disclosure of Invention
The invention aims to provide a mirror-like workpiece defect detector, which aims to solve the problems of poor detection effect and high cost of the existing detection device for detecting the defects of the mirror-like workpiece.
In order to achieve the above object, the present invention provides a mirror-like workpiece defect detecting apparatus for detecting surface defects of a mirror-like workpiece, the mirror-like workpiece defect detecting apparatus includes an annular light source disposed above the mirror-like workpiece, an annular grating disposed between the annular light source and the mirror-like workpiece for light to pass through and irradiate the mirror-like workpiece, a photographing device disposed above the annular light source, and a driving device for driving the mirror-like workpiece to move, wherein the photographing device is disposed coaxially with the annular grating and the annular light source.
As a further improvement of the invention, the annular light source is in contact fit with the annular grating.
As a further improvement of the present invention, the photographing device includes a camera and a lens fitted to the camera.
As a further improvement of the invention, the mirror-like workpiece defect detector further comprises a supporting table surface and a supporting column arranged below the supporting table surface, and the driving device is arranged on the supporting table surface.
As a further improvement of the present invention, the driving device includes two supporting seats extending upward from the supporting seat, a supporting rod connecting the two supporting seats, and a slide rail stage disposed on the supporting rod and capable of sliding along the supporting rod, wherein the mirror-like workpiece is disposed on the slide rail stage.
As a further improvement of the invention, the number of the support rods is two, and the two support rods are arranged at intervals to keep the balance of the slide rail object stage.
As a further improvement of the invention, the mirror-like workpiece defect detector further comprises a first fixed column extending upwards from the supporting platform and a connecting piece horizontally extending from the top end of the first fixed column, and the annular light source is fixed on the connecting piece.
As a further improvement of the present invention, the mirror-like workpiece defect detector further includes a second fixing column extending upward from the supporting platform, a height adjusting device connected to the second fixing column, and a connecting rod connected to the height adjusting device and extending in a horizontal direction, wherein the photographing device is fixed to the connecting rod.
As a further improvement of the invention, the mirror-like workpiece defect detector further comprises a control unit, and the control unit is electrically connected with the shooting device, the driving device and the annular light source
The invention has the beneficial effects that: the detector for detecting the surface defects of the mirror-like workpieces has the advantages of low cost, simple structure, no deformation of collected images, high identification efficiency and wide application prospect in detecting the surface defects of the mirror-like workpieces.
Drawings
FIG. 1 is a schematic perspective view of a defect detector for mirror-like workpieces according to the present invention;
FIG. 2 is a schematic side view of the defect detector for mirror-like workpieces according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 2, the defect detecting apparatus 100 of the present invention is used for detecting surface defects of a mirror-like workpiece 200.
The mirror-like workpiece defect detector 100 comprises an annular light source 1 arranged above the mirror-like workpiece 200, an annular grating 2 arranged between the annular light source 1 and the mirror-like workpiece 200 and used for allowing light to pass through and irradiate the mirror-like workpiece 200, a shooting device 3 arranged above the annular light source 1, a driving device 4 used for driving the mirror-like workpiece 200 to move, a supporting table 5 used for supporting the driving device 4, a supporting column 6 arranged below the supporting table 5, a first fixed column 7 extending upwards from the supporting table 5, a connecting piece 8 horizontally extending from the top end of the first fixed column 7, a second fixed column 9 extending upwards from the supporting table 5, a height adjusting device 10 connected with the second fixed column 9, a connecting rod 11 connected with the height adjusting device 10 and extending along the horizontal direction, A control unit.
In addition, the shooting device 3 is coaxially arranged with the annular grating 2 and the annular light source 1 so as to shoot the lower mirror-like workpiece 200 through an annular through hole between the annular grating 2 and the annular light source 1.
The photographing device 3 includes a camera 31 and a lens 32 fitted to the camera 31.
The driving device 4 includes two supporting seats 41 extending upward from the supporting table 5, a supporting rod 42 connecting the two supporting seats 41, and a slide rail stage 43 disposed on the supporting rod 42 and capable of sliding along the supporting rod 42. The mirror-like workpiece 200 is disposed on the slide stage 43, and the slide stage 43 can drive the mirror-like workpiece 200 to reciprocate, so that the photographing device 3 can photograph pictures with different phases.
The number of the support rods 42 is two, and the two support rods 42 are arranged at intervals to keep the slide rail object stage 43 balanced.
The shooting device 3 is fixed on the connecting rod 11, and the height of the shooting device 3 can be adjusted through the height adjusting device 10, so that the visual field of the mirror-like workpiece 200 detected by the lens 32 is changed, and the shooting requirement is met.
The height adjusting means 10 includes a connecting member 101 connecting the connecting member 8 and the connecting rod 11, and a fixing screw 102 for fixing the connecting member 101 to the first connection. The elevation of the camera 31 is controlled by the height of the connecting part 101 on the connecting part 8, so that the visual field of the lens 32 can meet the detection of the mirror surface workpiece 200 to be detected, and the camera 31 can shoot the mirror surface workpiece 200 to be detected right below.
The control unit is electrically connected with the shooting device 3, the driving device 4 and the annular light source 1. The control unit can work with the annular light source 1, control the driving device 4 to drive the mirror-like workpiece 200 to reciprocate, control the shooting device 3 to shoot and receive picture information, and can also analyze and process the received picture.
The use method of the mirror-like workpiece defect detector 100 of the invention is as follows: fixing the mirror-like workpiece 200 on the slide stage 43 of the driving device 4; fixing the annular light source 1 and the annular grating 2 and starting the annular light source 1 and the annular grating 2 to enable the annular light source 1 and the annular grating 2 to be positioned above the mirror-like workpiece 200, so that light and dark alternate stripes can be projected on the mirror-like workpiece 200; the height of the camera 31 and the lens 32 is adjusted through the height adjusting device 10 to obtain a better shooting view of the mirror-like workpiece 200; and starting the driving device 4 to drive the mirror-like workpiece 200 to reciprocate, controlling the camera 31 to shoot, and transmitting the shot pictures with different phases to the control unit.
The ring grating 2 can be simulated by MATLAB software in a control unit to generate a fringe phase pattern, and then a transparent mask plate containing a grating pattern is manufactured. The formula for generating the fringe phase pattern in the software is as follows:
or
I＝cos(2πf0x)。
Here, I denotes the generated two-dimensional annular fringe image, f0For spatial frequency, x and y represent coordinate points in the fringe image, and x and y range [ a, b ]]，b>a>0。
The defect detector 100 for the mirror-like workpiece has the advantages of low cost, simple structure, no deformation of the collected image, high identification efficiency and wide application prospect in detecting the surface defects of the mirror-like workpiece 200.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The utility model provides a class mirror surface work piece defect detector for detect the surface defect of class mirror surface work piece, its characterized in that: class mirror surface work piece defect detector is including setting up the annular light source of class mirror surface work piece top, setting are in annular light source with be used for between the class mirror surface work piece that the light passes and shine the annular grating on class mirror surface work piece, set up and be in the camera device of annular light source top, be used for the drive class mirror surface work piece removes drive arrangement, camera with annular grating with the coaxial setting of annular light source.
2. The mirror-like workpiece defect detector of claim 1, wherein: the annular light source is contacted and attached with the annular grating.
3. The mirror-like workpiece defect detector of claim 1, wherein: the shooting device comprises a camera and a lens matched with the camera.
4. The mirror-like workpiece defect detector of claim 1, wherein: the mirror-like workpiece defect detector further comprises a supporting table board and a supporting column arranged below the supporting table board, and the driving device is arranged on the supporting table board.
5. The mirror-like workpiece defect detector of claim 4, wherein: drive arrangement includes certainly two supporting seats that upwards extend are supported to the platform, connect two the bracing piece of supporting seat, setting are in the bracing piece just can follow the gliding slide rail objective table of bracing piece, class mirror surface work piece sets up on slide rail objective table.
6. The mirror-like workpiece defect detector of claim 5, wherein: the number of the supporting rods is two, and the two supporting rods are arranged at intervals to keep the balance of the slide rail object stage.
7. The mirror-like workpiece defect detector of claim 4, wherein: the mirror-like workpiece defect detector further comprises a first fixing column and a connecting piece, wherein the first fixing column extends upwards from the supporting platform, the connecting piece horizontally extends from the top end of the first fixing column, and the annular light source is fixed on the connecting piece.
8. The mirror-like workpiece defect detector of claim 4, wherein: the mirror-like workpiece defect detector further comprises a second fixing column extending upwards from the supporting platform, a height adjusting device connected with the second fixing column, and a connecting rod connected with the height adjusting device and extending along the horizontal direction, and the shooting device is fixed on the connecting rod.
9. The mirror-like workpiece defect detector of claim 1, wherein: the mirror-like workpiece defect detector further comprises a control unit, and the control unit is electrically connected with the shooting device, the driving device and the annular light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111021465.1A CN113945581A (en) | 2021-09-01 | 2021-09-01 | Mirror-like workpiece defect detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111021465.1A CN113945581A (en) | 2021-09-01 | 2021-09-01 | Mirror-like workpiece defect detector |
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| Publication Number | Publication Date |
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| CN113945581A true CN113945581A (en) | 2022-01-18 |
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| CN202111021465.1A Pending CN113945581A (en) | 2021-09-01 | 2021-09-01 | Mirror-like workpiece defect detector |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209086166U (en) * | 2018-09-26 | 2019-07-09 | 厦门福信光电集成有限公司 | Workpiece surface quality image capturing system |
| CN110174410A (en) * | 2019-06-27 | 2019-08-27 | 镇江苏仪德科技有限公司 | A kind of reflective or mirror metal surface irregularity defect detection device and method |
| CN212693577U (en) * | 2020-07-20 | 2021-03-12 | 昆山奥德鲁自动化技术有限公司 | Bearing cap surface detection device |
| CN112730463A (en) * | 2020-12-24 | 2021-04-30 | 武汉华工激光工程有限责任公司 | Device and method for detecting defects of glass cover plate based on coaxial grating light source |
-
2021
- 2021-09-01 CN CN202111021465.1A patent/CN113945581A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209086166U (en) * | 2018-09-26 | 2019-07-09 | 厦门福信光电集成有限公司 | Workpiece surface quality image capturing system |
| CN110174410A (en) * | 2019-06-27 | 2019-08-27 | 镇江苏仪德科技有限公司 | A kind of reflective or mirror metal surface irregularity defect detection device and method |
| CN212693577U (en) * | 2020-07-20 | 2021-03-12 | 昆山奥德鲁自动化技术有限公司 | Bearing cap surface detection device |
| CN112730463A (en) * | 2020-12-24 | 2021-04-30 | 武汉华工激光工程有限责任公司 | Device and method for detecting defects of glass cover plate based on coaxial grating light source |
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