Authors: Yu.N. Linnik, V.Yu. Linnik

Title of the article: Regularities of formation of maximum loads on cutters and executive engines of coal mining machines

Year: 2023, Issue: 6, Pages: 17-23

Branch of knowledge: 2.8.8. Geotechnology, Mining machines (engineering)

Index UDK: 622-1/-9, 622.023

DOI: 10.26730/1816-4528-2023-6-17-23

Abstract: The destruction of coal seams of complex structure containing strong het-erogeneities (solid inclusions and strong rock layers) is accompanied by the action of dynamic loads on the cutters of the executive bodies of coal mining machines, causing a decrease in the productivity of the coal extraction process and premature failure of their components and elements. To correctly select the operating modes of coal mining machines and perform calculations related to determining the required strength of cutters and transmission elements, it is necessary to take into account the level and nature of the occurrence of peak (maximum) loads occurring on the cutters during the destruction of layers of complex structure. In this regard, the first part of the article presents the results of experimental studies of the influence of cutting process parameters and geometric parameters of the cutting tool on loads for different types of interaction of cutters with solid inclusions. It has been established that when a cutter cuts through an inclusion and touches it, the dimensions of the latter have virtually no effect on the magnitude of the peak load. On the contrary, for cases of pullout, the magnitude of the peak cutting force significantly depends on the size and configuration of the inclusion, as well as the brittle-plastic properties of coal, which determine the nature of the connection between the inclusion and the massif. It has been established that of all types of interaction between a cutter and a solid inclusion, the greatest loads arise during their central cutting. Peak and average peak values of cutting and feed forces were determined for cases of central cutting of the most common carbonate inclusions with a sharp and blunt cutter. Calculation dependencies are proposed to determine the maximum loads on the cutters and the time of their action as a function of the operating parameters of the cutting process, the design and geometric parameters of the cutters.

Key words: coal cutter executive body coal mining machine solid inclusions cutting force maximum loads cutting resistance chip thickness and width

Receiving date: 12.10.2023

Approval date: 30.11.2023

Publication date: 21.12.2023

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