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ArticleName Image-based quality monitoring of metallurgical briquettes
DOI 10.17580/tsm.2022.09.13
ArticleAuthor Kashin D. A., Kulchitskiy A. A.
ArticleAuthorData

Saint Petersburg Mining University, Saint Petersburg, Russia:

D. A. Kashin, Postgraduate Student of the Department of Process and Production Automation, e-mail: s185023@stud.spmi.ru
A. A. Kulchitskiy, Associate Professor at the Department of Process and Production Automation, Candidate of Technical Sciences, e-mail: doz-ku@rambler.ru

Abstract

This paper examines the problem of monitoring the quality of briquetted charge for metallurgical industry. The authors analyze the existing techniques and systems that help detect contaminants in or improper shape of briquettes. The study revealed that the current practice is based on destructive spot tests only, while no automatic monitoring systems are available. So, the authors looked into the applicability of volume-weight technique for monitoring metallurgical briquettes. The study relied on digital images produced by machine vision cameras to analyze the geometry of briquettes, as well as their surface properties. The paper describes a possible combination of components for the proposed system. A method is proposed to estimate the volume of a briquette by considering the image shift in the calibration plane. A relationship was calculated of the relative error caused by faulty positioning when using the correction method and without using it. The paper also examines a technique that helps analyze the porosity of briquettes so that their true density and the concentration of contaminants in them could be further determined. TensorFlow software library and images of different objects were used to teach the neural network. The authors conducted a quality study to understand how accurately neural networks can identify the type of metal contained in a briquette. The performance of neural networks reached 94%. Analysis of samples conducted on a test bench showed that the described technique could be used to monitor the quality of metallurgical briquettes with a minimum 0.4 % accuracy of dimensional analysis. The latter is based on positioning error correction in relation to the calibration plane.

keywords Briquetted charge, machine vision, volume-weight technique, passive optical systems, automation, neural networks
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