Academician Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Moscow, Russia:

V. N. Zakharov, Director, Corresponding Member of the Russian Academy of Sciences

State University of Management, Moscow, Russia:

Yu. N. Linnik, Professor, Doctor of Engineering Sciences
V. Yu. Linnik, Professor, Doctor of Economic Sciences, vy_linnik@guu.ru

Tula State University, Tula, Russia:

A. B. Zhabin, Professor, Doctor of Engineering Sciences

Efficient performance and reliability of coal mining machines is in many ways governed by the appropriate selection and optimization of the parameters of their cutting tools. In parametric optimization of a cutting head under specific operating conditions, the source information is a coal cutting pattern and the related cutter arrangement pattern. The main parameters of the cutting patterns and cutter arrangement patterns are the cut thickness and width, cutter spacing, cutters per cutting line, and the cutter angle relative to coal mining machine advance. Coal mining machines most often use checkerboard, sequential and mixed patterns of cutting. Given specific cutting patterns and cutter arrangement patterns, their parametric optimization is based on the coal cutting efficiency, minimum energy consumption of coal destruction under the operating constraints, and the minimum allowable coefficient of variation in the total cutting force on the cutting tools in the specific operating conditions. In this respect, the authors review the factors governing optimality of coal cutting process with regard to the limited conveying ability of a cutting head and the limited cut thickness which determine specific energy of coal cutting and productivity of mining machines. The formulas and the calculations show that some certain-size coal cutting machines are satisfied with two rotation speed steps and two–three variants of cutters per cutting line to ensure operation with rational cut thicknesses within the whole range of the machine advance velocity. The cutter arrangement pattern on a cutting tool essentially governs load nonuniformity of a cutting head per revolution, which determines dynamic loading of the machine and reliability of transmission. In this respect, the estimated relations are presented to find the cutting head load nonuniformity factor and the structural coefficient of load variation, as well as the admissible values of the latter in the standard operating conditions.

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