CN116124006A - Automatic spot inspection method of battery pole piece visual inspection system - Google Patents
Automatic spot inspection method of battery pole piece visual inspection system Download PDFInfo
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- CN116124006A CN116124006A CN202310175105.XA CN202310175105A CN116124006A CN 116124006 A CN116124006 A CN 116124006A CN 202310175105 A CN202310175105 A CN 202310175105A CN 116124006 A CN116124006 A CN 116124006A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to an automatic spot inspection method of a battery pole piece visual inspection system, which comprises the following steps of S1, attaching an opaque white-bottom soft film on a roller, wherein the attaching position is at one side of a product; s2, starting point inspection; when a spot inspection signal is received, firstly, performing size spot inspection and gray level spot inspection simultaneously; s3, performing flaw detection after the two spot detection passes through the size spot detection and the gray spot detection; s4, generating a point inspection report after the flaw point inspection is passed. The invention can automatically check before the operation of each machine, and the items of the automatic check comprise transverse and longitudinal resolution check, standard size check, coating gray point check and coating defect check, thereby solving the problems of complicated manual check steps, long time consumption and manual parameter optimization; not only saving the time and manpower of manual spot inspection, but also greatly increasing the timeliness of spot inspection; the effect of one-day detection and one-day calibration is realized, and finally the accuracy of measurement and detection can be effectively increased.
Description
Technical Field
The invention relates to the technical field of visual detection, in particular to an automatic spot inspection method of a battery pole piece visual detection system.
Background
During operation of the machine vision system, due to slight movement of hardware equipment or product change and the like, in order to ensure accuracy of measurement and detection of the machine vision system after a period of use, resolution correction of the imaging system is required, and conversion coefficients between pixels and physical dimensions are calibrated to ensure accuracy of measurement. And calibrating the gray value of the product in the image to ensure the accuracy of coating detection.
The current known spot inspection modes in the industry are: the image resolution and the light source brightness are confirmed in the adjustment stage, the device is operated for a period of time, the resolution is calibrated manually in a fixed time, the actual product is required to be calibrated, and the resolution can be calibrated only by manually cutting a section of product and performing two-dimensional comparison. The prior art has the following disadvantages:
(1) The spot inspection frequency is low, and the spot inspection time is long: because the imaging system is required to be checked manually, the interval time of checking cannot be checked every time of reel change or every time of starting up.
(2) The secondary element measurement accuracy also has errors: because the product needs to be cut for spot inspection, measurement errors exist when the product is measured by adopting a secondary element, and the resolution adjusted by taking the value as a reference can also produce errors, so that the accuracy is reduced.
(3) The number of spot inspection items is small: because the product is used for spot inspection, the spot inspection quantity items are actual measurement points, the quantity of the measurement items is small, the risk of errors exists, and the spot inspection defect detection capability cannot be realized.
(4) After the professional is required to process the image, the spot inspection can be completed by adjusting parameters, so that the labor cost is increased.
Disclosure of Invention
The invention aims to solve the technical problems that: the automatic spot inspection method of the battery pole piece visual inspection system solves the problems of time and labor waste and hysteresis caused by the fact that spot inspection correction is required to be carried out on equipment regularly in order to ensure the accuracy of measurement and inspection of a machine visual inspection system.
The technical scheme adopted for solving the technical problems is as follows: an automatic spot inspection method of a battery pole piece visual inspection system comprises the following steps,
s1, sticking an opaque white-bottom soft film on a roller, wherein the sticking position is at one side of a product;
s2, starting point inspection; when a spot inspection signal is received, firstly, performing size spot inspection and gray level spot inspection simultaneously;
s3, performing flaw detection after the two spot detection passes through the size spot detection and the gray spot detection;
s4, generating a point inspection report after the flaw point inspection is passed.
Further, in the step S1 of the present invention, the film rotates along with the roller, and the image of the film is captured at the same time on one side of the product while capturing the product.
Further, in the step S2 of the present invention, the size spot inspection and the gray level spot inspection allow a certain number of failures and re-spot inspection; and the flaw detection is carried out by additionally marking standard defects on the product through a laser, and the flaw detection is not carried out again after failure.
Further, in the step S2 of the present invention, the size spot inspection includes the following steps,
s201, searching a picture with a complete film in the image;
s202, positioning square grids and round dots in the film, and measuring by using actually detected measurement data;
s203, comparing the measured value with a film standard value, and judging whether the measured data is within a tolerance range;
s204, if the tolerance is met, finishing size spot inspection; if the tolerance is exceeded, calculating the whole measurement value and judging whether the whole measurement value is a mutation value or not; and if the measured value is not the mutation value and the measured value has common deviation, correcting the resolution, and performing point inspection again after recalculating the resolution.
Further, in the step S2 of the present invention, the gray point detection includes the following steps,
s211, positioning a fixed mark area of a product, wherein the fixed mark area comprises a coating head, a coating tail, a space and a coating area;
s212, taking a section of area with a fixed length in the coating area, and detecting whether foreign matters or flaws exist in the area;
s213, if the area exists, the spot detection is not performed on the area, and the spot detection area is regenerated in the next graph; if not, calculating the average gray value of the current area, and judging whether the average gray value is within the tolerance range;
s214, finishing gray level point detection if the average gray level of the current area is within the tolerance range; if the average gray level of the current area exceeds the tolerance range, performing point detection again to judge whether the average gray level is within the tolerance range; if the number of the spot checks is still unqualified, the spot checks are not passed.
Further, in the step S3 of the present invention, flaw detection includes the following steps,
s31, sending an instruction for cleaning the flaw detection mark to the PLC, and controlling the laser to make flaws with fixed sizes at fixed positions below the fixed mark by the PLC;
s32, detecting whether flaw sizes and gray scales are within a tolerance range;
s33, if so, checking; if not, the spot check fails.
The invention has the beneficial effects that the defects in the background technology are overcome, the automatic spot inspection can be carried out before the operation of the machine is started each time, the items of the automatic spot inspection comprise transverse resolution spot inspection, longitudinal resolution spot inspection, standard size spot inspection, coating gray point inspection and coating flaw spot inspection, and the problems of complicated steps, long time consumption and manual parameter optimization are solved; by adopting the invention, the time and the labor for manual spot inspection are saved, and the time efficiency of spot inspection is greatly increased; the effect of one-day detection and one-day calibration is realized, and finally the accuracy of measurement and detection can be effectively increased.
Drawings
FIG. 1 is a schematic diagram of the imaging principles of the present invention;
FIG. 2 is a schematic diagram of the overall spot inspection process of the present invention;
FIG. 3 is a schematic diagram of a size-point inspection process according to the present invention;
FIG. 4 is a schematic diagram of a gray scale spot inspection process according to the present invention;
FIG. 5 is a schematic illustration of the flaw detection flow of the present invention;
in the figure: 1. a product; 2. a film; 3. and (3) a roller.
Detailed Description
The invention will now be described in further detail with reference to the drawings and a preferred embodiment. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
1-5, fixing a standard-size calibration film on a roller to realize size detection and resolution spot detection; sending flaw detection information through communication with an upper computer, and matching with a machine station to wash out a pair of light and dark defects through laser to perform flaw detection; the hardware structure of the invention adopts a line scanning camera, a film, a roller, a laser and the like, and the line scanning camera and the laser are not shown in fig. 1. According to the invention, the standard film is used for spot inspection, as shown in fig. 1, 8 squares with the size of 5mm, 6 squares with the size of 10mm and 10 black and white origins with the standard size exist in the film, and the spot inspection projects are more, so that the accuracy can be ensured. Fixing a standard-size calibration film on a roller to realize spot inspection of size detection and resolution; through the communication with the upper computer, can send flaw detection information, cooperate the board to wash out the spot inspection that a pair of light and shade defect carries out flaw detection through laser. And standard film is used as a reference for calibration and spot inspection, so that errors of secondary measurement are eliminated. There is also spot inspection of the coating gray scale and spot inspection of flaws.
The method specifically comprises the following steps:
s1, sticking an opaque white-bottom soft film on a roller, wherein the sticking position is at one side of a product; the film rotates along with the roller, and when the product is shot, the image of the film is shot at one side of the product.
S2, starting point inspection; when a spot inspection signal is received, firstly, performing size spot inspection and gray level spot inspection simultaneously; size and gray level spot checks allow a certain number of failures and re-spot checks. The defect inspection is performed after the first two pieces of defect inspection pass, and standard defects are required to be additionally marked on products by using laser in the defect inspection, so that the defects of the products are caused, and the defect inspection is performed again after the failure of the defect inspection is not supported. And if the flaw detection passes, generating a flaw detection report.
In the size spot inspection step, as shown in fig. 3, since the continuous collection of the strip-shaped product is completed by collecting a plurality of pictures, it is necessary to search a picture with a complete film in the image for size spot inspection. After finding the proper picture, it is first necessary to locate the black square in the film, measure its size, locate the dot area and measure its diameter. And finally, comparing the measured value with a film standard value, and finishing spot inspection after meeting the tolerance. If the measurement items exceeding the tolerance exist, the parameter fine adjustment function is used, the whole measurement value is calculated, whether the measurement value is a mutation value is judged, the spot inspection is performed again if the measurement value is the mutation value, if the measurement value is not the mutation value and the measurement value has common deviation, the resolution correction is performed, and the spot inspection is performed again after the resolution is recalculated.
The gray level spot inspection step is as shown in fig. 4, after the product fixing mark is located, gray level measurement is performed on the coating, first, whether foreign matters or flaws exist in the measurement area is detected, if so, spot inspection is not performed in the area, and the spot inspection area is generated again in the next image. And if the average gray level of the current area is within the tolerance range, finishing gray level point detection. If the average gray level of the current area exceeds the tolerance range, performing point detection again to judge whether the average gray level is within the tolerance range. If the number of times of spot inspection is up to the minimum, the spot inspection is failed.
S3, performing flaw detection after the two spot detection passes through the size spot detection and the gray spot detection; the step of checking the flaw is shown in fig. 5, after starting the flaw checking, a signal for cleaning a flaw checking mark needs to be given to the PLC, and the PLC controls the laser to make two kinds of defects of black and white with fixed size at a fixed position under the mark, such as a small square below a large square coated on the left side of fig. 1. And under the condition that the detected flaw size and the gray level reach the standards, the spot inspection passes, otherwise, the spot inspection is prompted to fail.
S4, generating a point inspection report after the flaw point inspection is passed.
The foregoing description is merely illustrative of specific embodiments of the invention, and the invention is not limited to the details shown, since modifications and variations of the foregoing embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (6)
1. An automatic spot inspection method of a battery pole piece visual inspection system is characterized by comprising the following steps of: comprises the steps of,
s1, sticking an opaque white-bottom soft film on a roller, wherein the sticking position is at one side of a product;
s2, starting point inspection; when a spot inspection signal is received, firstly, performing size spot inspection and gray level spot inspection simultaneously;
s3, performing flaw detection after the two spot detection passes through the size spot detection and the gray spot detection;
s4, generating a point inspection report after the flaw point inspection is passed.
2. The automatic spot inspection method of the battery pole piece visual inspection system according to claim 1, wherein the automatic spot inspection method comprises the following steps: in the step S1, the film rotates along with the roller, and the image of the film is shot at one side of the product at the same time when the product is shot.
3. The automatic spot inspection method of the battery pole piece visual inspection system according to claim 1, wherein the automatic spot inspection method comprises the following steps: in the step S2, the size spot inspection and the gray level spot inspection allow a certain number of failures and re-spot inspection; and the flaw detection is carried out by additionally marking standard defects on the product through a laser, and the flaw detection is not carried out again after failure.
4. The automatic spot inspection method of the battery pole piece visual inspection system according to claim 1, wherein the automatic spot inspection method comprises the following steps: in the step S2, the size spot check includes the following steps,
s201, searching a picture with a complete film in the image;
s202, positioning square grids and round dots in the film, and measuring by using actually detected measurement data;
s203, comparing the measured value with a film standard value, and judging whether the measured data is within a tolerance range;
s204, if the tolerance is met, finishing size spot inspection; if the tolerance is exceeded, calculating the whole measurement value and judging whether the whole measurement value is a mutation value or not; and if the measured value is not the mutation value and the measured value has common deviation, correcting the resolution, and performing point inspection again after recalculating the resolution.
5. The automatic spot inspection method of the battery pole piece visual inspection system according to claim 1, wherein the automatic spot inspection method comprises the following steps: in the step S2, the gray point detection includes the following steps,
s211, positioning a fixed mark area of a product, wherein the fixed mark area comprises a coating head, a coating tail, a space and a coating area;
s212, taking a section of area with a fixed length in the coating area, and detecting whether foreign matters or flaws exist in the area;
s213, if the area exists, the spot detection is not performed on the area, and the spot detection area is regenerated in the next graph; if not, calculating the average gray value of the current area, and judging whether the average gray value is within the tolerance range;
s214, finishing gray level point detection if the average gray level of the current area is within the tolerance range; if the average gray level of the current area exceeds the tolerance range, performing point detection again to judge whether the average gray level is within the tolerance range; if the number of the spot checks is still unqualified, the spot checks are not passed.
6. The automatic spot inspection method of the battery pole piece visual inspection system according to claim 1, wherein the automatic spot inspection method comprises the following steps: in said step S3, the flaw detection comprises the following steps,
s31, sending an instruction for cleaning the flaw detection mark to the PLC, and controlling the laser to make flaws with fixed sizes at fixed positions below the fixed mark by the PLC;
s32, detecting whether flaw sizes and gray scales are within a tolerance range;
s33, if so, checking; if not, the spot check fails.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310175105.XA CN116124006A (en) | 2023-04-19 | 2023-04-19 | Automatic spot inspection method of battery pole piece visual inspection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116879173A (en) * | 2023-09-08 | 2023-10-13 | 宁德时代新能源科技股份有限公司 | Cathode plate detection system and method |
| CN117309889A (en) * | 2023-11-27 | 2023-12-29 | 宁德时代新能源科技股份有限公司 | Pole piece edge detection device and method |
| CN117611689A (en) * | 2024-01-23 | 2024-02-27 | 凯多智能科技(上海)有限公司 | Calibration parameter calibration method, detection method, device, medium, equipment and system |
-
2023
- 2023-04-19 CN CN202310175105.XA patent/CN116124006A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116879173A (en) * | 2023-09-08 | 2023-10-13 | 宁德时代新能源科技股份有限公司 | Cathode plate detection system and method |
| CN116879173B (en) * | 2023-09-08 | 2024-02-02 | 宁德时代新能源科技股份有限公司 | Cathode plate detection system and method |
| CN117309889A (en) * | 2023-11-27 | 2023-12-29 | 宁德时代新能源科技股份有限公司 | Pole piece edge detection device and method |
| CN117611689A (en) * | 2024-01-23 | 2024-02-27 | 凯多智能科技(上海)有限公司 | Calibration parameter calibration method, detection method, device, medium, equipment and system |
| CN117611689B (en) * | 2024-01-23 | 2024-04-05 | 凯多智能科技(上海)有限公司 | Calibration parameter calibration method, detection method, device, medium, equipment and system |
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