Diagnostic methods and ways of testing the workability of coal - a review

Abstract

The need to classify rocks in terms of workability stems primarily from the need to choose the appropriate, most effective diagnostic method (DM) and way of mining the given rock. Studying and measuring the workability of rocks is extremely difficult due to the fact that workability depends on many various factors. There are many DM for determining the workability of rocks, but none of them take into account the influence of all factors, hence the obtained results are only indicative. In the article, many DM and ways of determining the cutting resistance with the use of various devices are presented and characterized. The principles of their operations are presented, as well as the DM of measuring the cutting resistance and its utilitarian usefulness in forecasting the selection of mining machines on the basis of cutting for specific mining and geological conditions. The core of the problem is confirmed by the number of covered DM and tools in various research centers around the world. In the article, new tools measuring and evaluating the mechanical properties of the coal solid, all created in Poland, are presented. Their structure, principles of their operation, as well as the innovation of these solutions, are all presented. In this article, their ad-vantages and disadvantages are highlighted, as well as showing the DM which best represents the way of work of the winning machine. Therefore, the results achieved through the aforementioned DM can be understood as representative values.

Assessment of the technical state of mining machinery and devices with the use of diagnostic methods

“…Technical diagnosis is a field of knowledge covering the overall technical and practical issues of identification and assessment of a technical object's current, past, and present states, taking its surroundings into account. Technical diagnosis aims to examine and assess the state of a technical object in a strictly defined moment of time, to compare it with its reference condition, conclude the usefulness of said device, or lack thereof, as well as conduct a prognosis of the possible future states of the object (Żółtowski and Ćwik, 1996;Chmielowiec, 2020;Biały and Fries, 2019;Biały et al, 2023). Therefore, the essence of technical diagnosis is to define the state of the machine based on measuring the values of specific diagnostic symptoms and comparing them with their nominal values.…”

“…-technological factors, determined by the degree of automation of production processes, as well as the correctness of make and assembly of assemblies and systems, -exploitative factors, connected with the "quality" of usage processes and usage of the object, the development of usage processes, damages and influence of external factors, i. e. meteorological conditions, additional forces, etc. (Niziński and Michalski, 2002;Biały et al, 2023). The above-mentioned factors often occur at random.…”