CN113945566A - Filter screen failure detection method - Google Patents
Filter screen failure detection method Download PDFInfo
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- CN113945566A CN113945566A CN202111351859.3A CN202111351859A CN113945566A CN 113945566 A CN113945566 A CN 113945566A CN 202111351859 A CN202111351859 A CN 202111351859A CN 113945566 A CN113945566 A CN 113945566A
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- 238000001514 detection method Methods 0.000 title claims description 17
- 239000000463 material Substances 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000005303 weighing Methods 0.000 claims abstract description 17
- 239000003086 colorant Substances 0.000 claims abstract description 7
- 238000005286 illumination Methods 0.000 claims description 3
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000719 pollutant Toxicity 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
The invention discloses a method for detecting failure of a filter screen, which comprises a weigher and an image collector; a filter screen is placed above the weighing device; the image collector capable of collecting the filter screen image is arranged above the weighing device; presetting the standard weight of a filter screen; measuring the actual weight of the filter screen through the weighing device, and if the deviation of the actual weight and the standard weight of the filter screen exceeds a set weight threshold value, determining that the filter screen is invalid; presetting an effective filter material color CIE Lab value; the method comprises the steps of collecting images of a filter screen through an image collector, processing the images of the filter screen, selecting a plurality of filter material coverage areas, reading the CIE Lab values of the average filter material colors of the filter material coverage areas, and if the value a in the CIE Lab values of the average filter material colors is lower than the CIE Lab value of the effective filter material color, determining that the filter screen is invalid. The method is scientific, simple and convenient in process and cost-saving.
Description
Technical Field
The invention belongs to the technical field of equipment detection, and particularly relates to a filter screen failure detection method.
Background
With the increasing living standard and health consciousness, air purifiers are more and more popular in home and office environments. Accordingly, there is little concern regarding whether or not a filter screen or a filter element, which is a core member of an air cleaner, has failed, and how to judge it. Generally, the failure standard of the filter screen or the filter element is only recommended to be replaced after the filter screen or the filter element is used for a long time, but the simple time standard cannot meet the requirement according to different use environments and use modes.
In CN 104596051A-system for detecting images of filter screens of air purifiers, continuous photographing and image comparison are performed to determine whether a filter screen has failed by checking the adhesion of dust to the filter screen and the aging of the filter screen. The method has a long period, is generally only suitable for HEPA filter screens only with dust filtering function, and the color judgment method does not give a judgment basis clearly, thereby seriously limiting the popularization and application of the technology. Meanwhile, the problems of single judgment mode and poor accuracy exist.
In CN 211718057U-filter screen detection device and air purifier, a reflected light system is used to detect the filter screen, the technical method is not suitable for filter screens with more air leakage and has poor detection accuracy, and the color judgment method does not clearly give a judgment basis and is not suitable for filter screens actually used in the air purification industry. The above technique is not concerned with determining whether a filter net produced and stored for a long time is effective.
How to reliably and conveniently identify the failure of the filter screen, reduce the operation complexity and improve the identification efficiency and accuracy becomes a technical problem to be solved.
Disclosure of Invention
Aiming at the technical problem, the invention discloses a filter screen failure detection method which can realize convenient and accurate detection.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for detecting failure of a filter screen comprises a weighing device, wherein the filter screen is placed above the weighing device; an image collector capable of collecting the image of the filter screen is arranged above the weighing device;
presetting standard weight of the filter screen (such as 605mm × 350mm filter screen, weight of 900 g/sheet), measuring actual weight of the filter screen by a weighing machine, and if deviation of the actual weight and the standard weight of the filter screen exceeds a set weight threshold, determining that the filter screen is failed;
presetting an effective filter material color CIE Lab value; the method comprises the steps of collecting images of a filter screen through an image collector, processing the images of the filter screen, selecting a plurality of filter material coverage areas, calculating the average color CIE Lab values of the filter materials of the filter material coverage areas, and if the value a in the average color CIE Lab values of the filter materials is lower than the effective color CIE Lab value of the filter materials, determining that the filter screen is invalid.
Furthermore, the system also comprises a color judgment system, wherein the color judgment system comprises a standard light source and a standard color plate. The standard light source is used for providing illumination for the acquisition area of the image acquisition device, and the standard color plate is arranged on the weighing device and used as a background plate for image acquisition of the filter screen, namely the standard light source irradiates the filter screen and the standard color plate.
Furthermore, the light source can improve the image quality collected by the image collector and improve the accuracy of the failure detection of the filter screen. And under the irradiation of a standard light source, reading the average CIE Lab value of the filter material in the filter material coverage area, and comparing the average CIE Lab value with the preset effective filter material color CIE Lab value, wherein the filter material on the filter screen is considered to be invalid if the color difference delta E is more than or equal to 10.
Further, the a value in the CIE Lab value of the effective filter material color is not lower than 15.
Further, uniformly dividing the collected filter screen image into at least 4 image areas, respectively collecting filter material coverage areas in the image areas, and calculating the average color CIE Lab value of the filter material in each filter material coverage area; preferably, the screen image is evenly divided into 9 image areas. The method is divided into a plurality of areas for collection, so that the misjudgment condition that the large-area filter screen is invalid due to local failure is avoided.
Furthermore, the coverage area of each filter material is not more than 0.5cm multiplied by 0.5 cm.
Further, the value range of the weight threshold is 120-180 g.
The invention has the following beneficial effects: the method for detecting the failure of the filter screen adopts an image recognition mode, comprehensively judges whether the filter screen fails or not by effectively recognizing and judging colors of a plurality of areas of the filter screen and combining the weight characteristics of the filter screen, is scientific, has simple and convenient process, and is particularly suitable for effectively judging whether the filter screen which is produced and stored for a long time is valid or not.
The standard light source and the standard color plate form a color detection system, the filter screen is subjected to image acquisition through the image acquisition device, the efficiency and the accuracy of failure detection of the filter screen are improved, the uniform failure judgment standard based on the difference of effective colors and failure colors is formed for the same type of filter screen, and meanwhile, the artificial error of judging the integral failure of the filter screen due to the local failure of the filter screen is avoided. And the addition of the standard color plate also enables the technology to be suitable for common filter screen types with more air leakage, thereby being beneficial to the future popularization and application of the technology.
The filter screen failure judging method combining weighing and image recognition is adopted in the technology, so that interference of dust and other pollutants can be avoided, and failure misjudgment is caused. The method is convenient for rapid and accurate judgment of a large number of large-size filter screens, and is beneficial to actual filter screen production and use.
Drawings
Fig. 1 is a schematic structural diagram of a filter screen failure detection device according to an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following embodiments and accompanying drawings.
As shown in fig. 1, the filter screen failure detection device of this embodiment includes a box 1, a weighing device 2, a standard light source 3, an image collector 4, a bracket 5, and a standard white board 6.
The box body 1 is used for avoiding the influence of external light, providing protection for the device and the like. The weighing device 2 and the bracket 5 are arranged in the box body 1; a standard white board 6 is arranged above the weighing device 2, and a filter screen 7 is placed on the standard white board 6; the image collector 4 is arranged on the bracket 5 and above the weighing device 2 and can collect the complete image of the filter screen 7.
The color judgment system also comprises a standard light source 3, a standard light source 3 and a standard white board 6. The standard light source 3 is arranged at the top of the box body 1, and the standard light source 3 can uniformly irradiate the range of the filter screen 7 to be detected. The standard light source 3 is used for providing illumination for the acquisition area of the image acquirer 4, namely illuminating the filter screen 7 and the standard white board 6. The standard light source 3 can improve the quality of the image collected by the image collector 4 and improve the accuracy of failure detection of the filter screen 7.
The filter screen failure detection method comprises the steps of presetting the standard weight of the filter screen (for example, the filter screen with the size of 605mm multiplied by 350mm and the weight of 900 g/piece), measuring the actual weight of the filter screen 7 through the weighing device 2, and if the deviation of the actual weight and the standard weight of the filter screen 7 exceeds 150g, determining that the filter screen 7 fails;
under a standard light source of D65, the color CIE Lab value of the effective filter material preset in this embodiment is L: 50, a: 20, b: 6; the standard light source 3 can improve the quality of the image collected by the image collector 4 and improve the accuracy of failure detection of the filter screen 7. Under the irradiation of a standard light source 3, an image of a filter screen 7 is collected through an image collector 4, then the filter screen image is processed, the collected filter screen image is uniformly divided into 9 image areas, filter material coverage areas are respectively collected in the image areas, then the average color CIE Lab value of the filter material of each filter material coverage area is calculated, the color difference delta E between the average color CIE Lab value and the color CIE Lab value of a preset effective filter material is more than or equal to 10, and the value a in the CIE Lab value is less than 20, and the filter material on the filter screen is considered to be invalid.
In this embodiment, 9 filter material coverage areas are randomly selected. The coverage area of each filter material is not more than 0.5cm multiplied by 0.5 cm.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (8)
1. A filter screen failure detection method is characterized in that: comprises a weigher and an image collector;
a filter screen is placed above the weighing device; the image collector capable of collecting the filter screen image is arranged above the weighing device;
presetting the standard weight of a filter screen; measuring the actual weight of the filter screen through the weighing device, and if the deviation of the actual weight and the standard weight of the filter screen exceeds a set weight threshold value, determining that the filter screen is invalid;
presetting an effective filter material color CIE Lab value; the method comprises the steps of collecting images of a filter screen through an image collector, processing the images of the filter screen, selecting a plurality of filter material coverage areas, reading the CIE Lab values of the average filter material colors of the filter material coverage areas, and if the value a in the CIE Lab values of the average filter material colors is lower than the CIE Lab value of the effective filter material color, determining that the filter screen is invalid.
2. The method of detecting screen failure according to claim 1, wherein: the color judgment system comprises a standard light source and a standard color plate; the standard light source is used for providing illumination for the acquisition area of the image acquirer, and the standard color plate is arranged on the weigher and used as a background plate for acquiring the filter screen image.
3. The method of detecting screen failure according to claim 3, wherein: and under the irradiation of the standard light source, reading the average CIE Lab value of the filter material in the filter material coverage area, wherein the color difference delta E between the average CIE Lab value and the CIE Lab value of the standard color value is more than or equal to 10, and the value a in the CIE Lab value is less than 15, and the filter material on the filter screen is considered to be invalid.
4. A method of detecting filter screen failure according to any of claims 1 to 3, wherein: the a value in the CIE Lab value of the effective filter material color is not lower than 15.
5. The method of detecting screen failure according to claim 4, wherein: the method comprises the steps of uniformly dividing the collected filter screen image into at least 4 image areas, collecting the filter material coverage areas in the image areas respectively, and calculating the average color CIE Lab value of the filter material in each filter material coverage area.
6. The method of detecting screen failure according to claim 5, wherein: the filter screen image is evenly divided into 9 image areas.
7. The method of detecting screen failure according to claim 6, wherein: the coverage area of each filter material is not more than 0.5cm multiplied by 0.5 cm.
8. A method of detecting filter screen failure according to any of claims 1 to 3, wherein: the value range of the weight threshold is 120-180 g.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111351859.3A CN113945566A (en) | 2021-11-16 | 2021-11-16 | Filter screen failure detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111351859.3A CN113945566A (en) | 2021-11-16 | 2021-11-16 | Filter screen failure detection method |
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| CN113945566A true CN113945566A (en) | 2022-01-18 |
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Citations (7)
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|---|---|---|---|---|
| CN204806606U (en) * | 2015-01-29 | 2015-11-25 | 皓庭(唐山）环境科技有限公司 | Air purification device filter screen image detection system |
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2021
- 2021-11-16 CN CN202111351859.3A patent/CN113945566A/en active Pending
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| CN107485929A (en) * | 2017-07-28 | 2017-12-19 | 珠海格力电器股份有限公司 | A kind of screen pack contamination detection method and device |
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