Detection method of PET bottle cap and liquid level

Abstract

The invention discloses a detection method of a PET bottle cap and a liquid level. The method comprises steps of: segmenting an interested zone of an image and carrying out pretreatment on the image; carrying out segmentation on a PET bottle body and a background zone; carrying out PET bottle symmetry axis positioning on the image after the pretreatment; and carrying out detection according to the position of the symmetry axis and a line, which a PET bottle adapter ring is on, and coordinates of an adapter ring central point. The method of the invention can carry out real-time ongoing detection on PET bottle cap and liquid level defect on a high speed automatic production pipeline and realize high detection efficiency.

Description

Technical field [0001] The invention belongs to the technical field of industrial automation detection, and in particular relates to a method for detecting PET bottle caps and liquid levels, which can perform real-time and uninterrupted detection of defects in PET bottle caps and liquid levels on a high-speed automated production line. Background technique [0002] In the current production process of beer, beverages and medicines, filling containers are required to meet corresponding quality standards, and strict tests must be carried out before and after production and filling. For example, for PET bottles, it is necessary to check whether the cap and the liquid level are defective. If the cap is not properly closed, foreign matter may be introduced and the food may be unhealthy; if the cap has burrs or cracks, it may cause injury to the eater; if the liquid level is too high If the liquid level is too low, it may cause the loss of the overall image of the company. [0003] At p...

AI Technical Summary

Problems solved by technology

For example, for PET bottles, it is necessary to detect whether the cap and the liquid level are defective. If the cap is not closed properly, foreign matter may be introduced and cause unhealthy food; if the cap has burrs or cracks, it may cause injury to the eater; if the liquid level is too high If the liquid level is too high, it may cause the explosion of the PET bottle during transportation or under sunlight; if the liquid level is too low, it may cause the loss of the overall image of the enterprise

Manual inspection is a traditional industrial inspection method. The inspector mainly inspects each PET bottle for defects through visual observation. The existing problems are: low detection rate, slow speed, difficult data statistics and high cost

Sensor detection uses various sensors for detection, such as using X-ray sensors to detect whether the liquid level is qualified. The existing problems are: easily affected by the external environment, and the system has poor versatility

However, their algorithms are complex and cannot meet the needs of detecting PET bottles on modern high-speed production lines, and the detection rate is not enough to overcome the influence of bottle body tilt, chain jitter, bottle body water droplets and burrs

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