COMPARATIVE ANALYSIS OF DYNAMIC COEFFICIENTS IN LIGNITE CUTTING AND OF THE EXCAVATION MACHINES IN THE OLTENIA'S OPEN PITS

Sorin Mihai RADU, Stela DINESCU, Florin VÎLCEANU

Abstract


Understanding the dynamic nature of the excavation process is crucial for studying the overall stability of the rotor excavator and any device displacing in homogeneous materials. This paper focuses on analyzing the influence of the dynamic coefficient, kd, of the cutting process, determined for various lignite quarries in the Oltenia Coal Basin, on stress levels, frequencies generated during the excavation process, and the dynamic factor of the machinery. It is observed that under certain exceptional working conditions, the maximum value of the dynamic factor of the excavation process can be equal to the dynamic factor of the machinery. This analysis contributes to optimizing the cutting process, reducing tooth bucket change times, and enhancing the mechanical/structural reliability of the equipment. The investigation method employed is electric strain gauge measurement, a straightforward and efficient technique that eliminates the need for coal sample collection and transportation to the laboratory. Data are directly obtained from the excavation mode of the equipment in coal, overburden, or mixed coal overburden strata.

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References


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DIN 22261-2 Excavators, spreaders and auxiliary equipment in opencast lignite mines - Part 2: Calculation principles.


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