A method for automatically removing surface contamination from a product component

Abstract

The application relates to a method for automatically removing surface contamination of a product component, S1, obtaining information of each surface of the product component; S2, determining a contamination level of a surface of the product component according to a projection surface image of the surface, judging whether the contamination level meets an index requirement, if not, entering S3, if yes, entering S6; S3, removing the contamination of the surface of the product component according to the contamination result of the surface; S4, judging whether the current contamination level of the surface of the product component meets the index requirement, if not, entering S5, if yes, entering S6; S5, judging whether the current contamination removal times of the surface of the product component exceed a set threshold, if yes, reminding stubborn contamination, if not, returning to S3; S6, turning over the product component; S7, judging whether the contamination level of another surface of the product component meets the index requirement, if not, entering S3, if yes, judging whether the product component has finished removing the contamination, if not, entering S6, if yes, ending the removal of the surface contamination of the product component. The method effectively solves the cleanliness requirement of the product component.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of surface contamination removal, and particularly relates to a method for automatically removing surface contamination of product components. BACKGROUND

[0002] In a production workshop, an experimental site or an engineering site, where a high number of dust-free workshops, product components with low contamination levels, product components with high anti-static requirements, and production / application sites with strict humidity and temperature control are intertwined, it is inevitable that tiny particles that cannot be identified by the naked eye float in the air.

[0003] In order to avoid or reduce the potential risks of unintentional static electricity to product components as much as possible, controlling the air humidity and air temperature in the corresponding application scenarios is one of the common and effective means. Due to various factors, the tiny particles floating in the air will eventually settle on the surface of an object. During the corresponding production operation, the tiny particles adhere to the surface of a product component due to the water tension, and the ongoing work process affects the corresponding process, electrical characteristics, functional indicators, test data, and other errors of various corresponding indicators, especially in high-precision products, the unqualified rate is particularly prominent. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a method for automatically removing surface contamination of product components to overcome the shortcomings of the prior art.

[0005] The technical solution of the present application to solve the above technical problem is as follows: a method for automatically removing surface contamination of product components, the specific steps are as follows:

[0006] S1, obtaining the projection plane image of each face of the product component and the contour information of each face;

[0007] S2, determining the contamination level of the current face of the product component according to the projection plane image of the face, and judging whether it meets the index requirement. If it does not meet the index requirement, output the current face contamination result and enter S3. If it meets the index requirement, enter S6.

[0008] S3, removing the contamination of the current face of the product component by high-pressure air cleaning according to the current face contamination result;

[0009] S4, obtaining the projection plane image of the current face again, and judging whether the contamination level of the current face of the product component meets the index requirement. If it does not meet the index requirement, output the current face contamination result again and enter S5. If it meets the index requirement, enter S6.

[0010] S5, judging whether the current face of the product component exceeds the set threshold value according to the current face contamination level, if yes, reminding stubborn contamination, and ending the removal of the surface contamination of the product component, if no, returning to S3;

[0011] S6, turning over the product component;

[0012] S7, determining the current face contamination level of the product component according to the projection face image of another face of the product component without contamination removal, and judging whether it meets the index requirement, if not, outputting the current face contamination result and entering S3, if yes, judging whether the removal of the contamination of all faces of the product component is completed, if not, entering S6, if yes, entering S8;

[0013] S8, ending the removal of the surface contamination of the product component.

[0014] On the basis of the above technical solution, the application can also be improved as follows.

[0015] Further, the industrial camera is used to pick up each projection face of the product component.

[0016] Further, the contour generation process of each face of the product component is as follows:

[0017] S11, pre-processing the projection face image of each face;

[0018] S12, filter processing;

[0019] S13, edge detection operator;

[0020] S14, post-processing;

[0021] S15, threshold processing;

[0022] S16, edge feature extraction;

[0023] S17, obtaining the contour of each face.

[0024] Further, the pre-processing includes: gray scale conversion, noise removal, and smoothing; the filter processing uses a Gaussian filter or a median filter; and the edge detection operator is: Sobel operator, Prewitt operator, or Canny operator.

[0025] Further, the contamination is first judged according to the projection face image of the product component, and then the current face contamination level is determined according to the contamination degree, and the contamination level is divided into a mild contamination level, a moderate contamination level, and a severe contamination level.

[0026] Further, the mild contamination level is defined as the contamination area reaching 1% to 30% of the projection area, the moderate contamination level is defined as the contamination area reaching 30% to 60% of the projection area, and the severe contamination level is defined as the contamination area reaching 60% to 100% of the projection area.

[0027] Further, the threshold values corresponding to the mild contamination level, the moderate contamination level and the severe contamination level are sequentially increased.

[0028] Further, in the process of removing the contamination on the current surface of the product component by the high-pressure air jet cleaning method, the position of the high-pressure air outlet of the product component surface contamination removal device is adjusted according to the current surface contamination result, and then the air outlet amount, air outlet size, air outlet time and air outlet strength required by the high-pressure air outlet are determined.

[0029] Further, the maximum size in the current surface of the product component is selected as the length of the current surface, and the start position and the end position of the high-pressure air outlet relative to the position of the high-pressure air outlet are recorded, and the start position of the high-pressure air outlet is adjusted; the maximum size in the current surface of the product component is selected as the length of the current surface, and the minimum size in the current surface is selected as the width of the current surface, and the current surface is fitted into a regular figure, and the area of the current surface is calculated according to the length and the width, and then the air outlet amount, air outlet size, air outlet time and air outlet strength required by the high-pressure air outlet are determined according to the area of the current surface.

[0030] Further, in the process of removing the contamination on the current surface of the product component by the high-pressure air jet cleaning method, when the contamination level is mild, 0.07Mpa / m 2 of atmospheric pressure is adopted at a speed of 0.0001m / s for 10 seconds per 1 square meter; when the contamination level is moderate, 0.15Mpa / m 2 of atmospheric pressure is adopted at a speed of 0.0001m / s for 10 seconds per 1 square meter; and when the contamination level is severe, 1.0Mpa / m 2 of atmospheric pressure is adopted at a speed of 0.0001m / s for 10 seconds per 1 square meter.

[0031] The beneficial effects of the present application are that the cleanliness requirement of the product component can be effectively solved in the production workshop, experimental site and other application scenarios where a high number of dust-free workshops, low contamination level requirements of product components, high anti-static requirements of product components, and strict control of humidity and temperature in production / application sites are intertwined, the data accuracy of each production / experiment / application link is improved, and the product qualification rate is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The flowchart of the method for automatically removing the surface contamination of the product component in the present application is shown in the figure.

[0033] Figure 2 The flowchart for generating the surface contour of the product component is shown in the figure. Detailed Implementation

[0034] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0035] Example 1

[0036] like Figure 1 As shown, a method for automatically removing contaminants from the surface of product parts includes the following steps:

[0037] S1. Obtain the projected images of each face of the product component and the outline information of each face. The number of faces of the product component can be 3, 4, 5, 6, etc.

[0038] S2. Determine the current surface contamination level of the product component based on the image of the projection surface (e.g., the front projection surface) of a certain surface, and determine whether it meets the index requirements. If it does not meet the index requirements, output the current surface contamination result and proceed to S3. If it meets the index requirements, proceed to S6.

[0039] S3. Based on the current surface contamination results, remove the contamination from the current surface of the product components using high-pressure jet cleaning;

[0040] S4. Obtain the current projection surface image again and determine whether the current surface contamination level of the product component meets the index requirements. If it does not meet the index requirements, output the current surface contamination result again and proceed to S5. If it meets the index requirements, proceed to S6.

[0041] S5. Determine whether the number of times the current surface of the product component has been removed exceeds the set threshold based on the current level of contamination. If yes, then remind the user of stubborn contamination and end the removal of contamination from the surface of the product component. If no, then return to S3.

[0042] S6. Flip the product components;

[0043] S7. Based on the projection image of another surface of the product component that has not been cleaned (such as the rear projection surface), determine the current surface contamination level of the product component and determine whether it meets the index requirements. If it does not meet the index requirements, output the current surface contamination result and proceed to S3. If it meets the index requirements, determine whether all surfaces of the product component have been cleaned. If not, proceed to S6. If yes, proceed to S8.

[0044] S8. Finish removing surface contaminants from product components.

[0045] Example 2

[0046] like Figure 2 As shown, this embodiment is a further improvement on embodiment 1, as detailed below:

[0047] For example, if the product component has 6 faces, 6 projection faces of the product component should be picked up, which are front projection face, back projection face, upper projection face, lower projection face, left projection face and right projection face. This is only an example description. If the product component has 4 faces, only 4 projection faces of the product component should be picked up. The number of projection faces to be picked up is determined according to actual engineering.

[0048] In addition, the contour of a face of the product component can be obtained through a series of software processing and corresponding software algorithms. In the embodiment, the contour generation process of each face of the product component is as follows:

[0049] S11, pre-processing of the projection face image of each face to improve image quality, including gray scale conversion, noise removal and smoothing;

[0050] S12, filter processing to improve the accuracy of subsequent edge detection, using a Gaussian filter or a median filter;

[0051] S13, edge detection operator, which is Sobel operator, Prewitt operator or Canny operator;

[0052] S14, post-processing, further processing and optimization of the detected edge to improve the accuracy and interpretability of the edge detection result;

[0053] S15, threshold processing;

[0054] S16, edge feature extraction;

[0055] S17, obtaining the contour of each face.

[0056] Embodiment 3

[0057] As shown in Figure 1 This embodiment is a further improvement based on embodiment 2, which is as follows:

[0058] According to the projection face image of the product component, the contamination is judged, and then the current face contamination level is determined according to the contamination degree. The contamination level is divided into light contamination level, medium contamination level and heavy contamination level. For example, the contamination area of 1% to 30% of the projection area is defined as light contamination level, the contamination area of 30% to 60% of the projection area is defined as medium contamination level, and the contamination area of 60% to 100% of the projection area is defined as heavy contamination level. This is only an example description, and the specific contamination level is determined according to actual engineering practice. The contamination judgment process uses existing computer software algorithm technology.

[0059] The thresholds for light, moderate, and heavy contamination levels increase sequentially. For example, the threshold for light contamination can be 3, for moderate contamination it can be 6, and for heavy contamination it can be 9. Other values ​​are also possible; this is just an example. The specific threshold can be determined based on the actual project.

[0060] Example 4

[0061] like Figure 1 As shown, this embodiment is a further improvement on embodiment 1, 2, or 3, as detailed below:

[0062] When removing surface contamination from product components using high-pressure jet cleaning, first adjust the position of the high-pressure air outlet of the surface contamination removal device based on the current contamination result, and then determine the required air volume, air size, air time, and air intensity of the high-pressure air outlet.

[0063] Furthermore: Select the largest dimension of the current face of the product component as the length of the current face, and record the start position and end position of the high-pressure air outlet relative to the high-pressure air outlet position, and adjust the start position of the high-pressure air outlet.

[0064] Select the largest dimension of the current face of the product component as the length of the current face and the smallest dimension of the current face as the width of the current face, fit it into a regular shape, calculate the area of ​​this face based on the length and width dimensions, and then determine the required air volume, air size, air time and air intensity of the high pressure outlet based on the area of ​​this face.

[0065] When removing surface contamination from product components using high-pressure jet cleaning, for light contamination levels, apply 0.07 MPa / m² of high-pressure jet cleaning solution per square meter. 2 Atmospheric pressure, at a speed of 0.0001 m / s, with a delay of 10 seconds; for moderate contamination, use 0.15 MPa / m² per square meter. 2 Atmospheric pressure, at a speed of 0.0001 m / s, with a delay of 10 seconds; for highly contaminated levels, use 1.0 MPa / m² per square meter. 2 At atmospheric pressure, at a speed of 0.0001 m / s, with a delay of 10 seconds, it would take 1 minute to remove all surfaces of the product component. The specific technical parameters can be determined based on actual engineering practice and are not limited to these technical parameters.

[0066] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for automatically removing surface contamination from a product component, characterized by, The specific steps are as follows: S1, obtaining the projection plane image of each face of the product component and the contour information of each face; S2, first, judging the contamination according to the projection plane image of a face of the product component, then determining the contamination level of the current face of the product component according to the contamination degree, the contamination level is divided into a light contamination level, a moderate contamination level and a heavy contamination level, the threshold values corresponding to the light contamination level, the moderate contamination level and the heavy contamination level are increased in turn, and it is judged whether the index requirement is met, if the index requirement is not met, the current face contamination result is output and S3 is entered, if the index requirement is met, S6 is entered; S3, removing the contamination of the current face of the product component by a high-pressure air jet cleaning method according to the current face contamination result; S4, obtaining the projection plane image of the current face again, and judging whether the contamination level of the current face of the product component meets the index requirement, if the index requirement is not met, the current face contamination result is output again and S5 is entered, if the index requirement is met, S6 is entered; S5, judging whether the number of times of removing the current face of the product component exceeds the set threshold value according to the contamination level of the current face, if yes, stubborn contamination is reminded, and the removal of the surface contamination of the product component is ended, if no, S3 is returned; S6, turning over the product component; S7, determining the contamination level of the current face of the product component according to the projection plane image of another face of the product component which has not been removed, and judging whether the index requirement is met, if the index requirement is not met, the current face contamination result is output and S3 is entered, if the index requirement is met, it is further judged whether the removal of the contamination of all faces of the product component is completed, if not, S6 is entered, if yes, S8 is entered; S8, ending the removal of the surface contamination of the product component.

2. A method of automatically removing product component surface contamination according to claim 1, wherein, An industrial camera is used to pick up each projection plane of the product component.

3. A method of automatically removing surface contamination from a product component according to claim 1 or 2, characterised in that, The contour generation process of each face of the product component is as follows: S11, pre-processing the projection plane image of each face; S12, filter processing; S13, edge detection operator; S14, post-processing; S15, threshold processing; S16, edge feature extraction; S17, obtaining the contour of each face.

4. A method of automatically removing product component surface contamination according to claim 3, wherein, The pre-processing includes gray scale conversion, noise removal and smoothing, the filter processing uses a Gaussian filter or a median filter, and the edge detection operator is a Sobel operator, a Prewitt operator or a Canny operator.

5. The method of automatically removing surface contamination from a product component according to claim 1, wherein, The light contamination level is defined as the contamination area reaching 1% to 30% of the projection area, the moderate contamination level is defined as the contamination area reaching 30% to 60% of the projection area, and the heavy contamination level is defined as the contamination area reaching 60% to 100% of the projection area.

6. The method of automatically removing product component surface contamination of claim 1, wherein, In the process of removing the contamination of the current face of the product component by the high-pressure air jet cleaning method, first, the position of the high-pressure air outlet of the product component surface contamination removal device is adjusted according to the current face contamination result, and then the air output amount, the air size, the air time and the air strength required by the high-pressure air outlet are determined.

7. A method of automatically removing product component surface contamination according to claim 6, wherein, The maximum size of the current face of the product component is selected as the length of the current face, and the high-pressure outlet start position and the high-pressure outlet end position are recorded relative to the high-pressure outlet position, and the high-pressure outlet start position is adjusted. The maximum size of the current face of the product component is selected as the length of the current face, and the minimum size of the current face is selected as the width of the current face, which is fitted into a regular figure, and the area of the face is calculated according to the length and width dimensions, and the required air outlet amount, air outlet size, air outlet time and air outlet strength of the high-pressure outlet are determined according to the area of the face.

8. A method of automatically removing surface contamination from a product component according to claim 6 or 7, characterised in that, For the removal of light levels of contamination, 0.07 MPa / m 2 atmospheric pressure, at a velocity of 0.0001 m / s for a 10 s delay, per 1 m2 2 atmospheric pressure, at a velocity of 0.0001 m / s for a 10 s delay, per 1 m2 2 atmospheric pressure, at a velocity of 0.0001 m / s for a 10 s delay.

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