Patterns of influence exerted by cutting drum reliability and coal seam properties on cutter–loader capacity

Practical and theoretical capacities of cutter–loaders depend on reliability of cutting drums and on wearability of cutting tools. The wear rate of cutter picks is governed by the strength of coal in the area of operation of the cutting drum. The coal strength characteristics are estimated from cuttability defining abrasive ability of coal and rocks under cutting. The correlations of the feed sped and theoretical capacity of cutter–loaders and the dulling area of cutter picks are obtained and used to recommend the maximum allowable values of these characteristics for different cutter–loaders of different capacities. The theoretical capacity equations are given for the events of piecemeal and specified replacement of cutter picks. The studies into input power, specific energy consumption and capacity of a cutter loader in proportion to depletion of cutting drum life are presented. The physics of their variation patterns (increase) consists in the growing dynamic burden of a cutter–loader when cutter supports fail and unbroken coal remains between cutter picks as the cutting drum blades interengage with such unbroken coal, which decelerates the machine feed speed and increases the energy content of coal cutting. The practical capacity of a cutter–loader, alongside with the time spent for accomplishment of ending operations and for emergency maintenance of longwall equipment depends on the replacement time of fault cutter picks and drums, out of other coal cutting operations. The computational relations for finding the practical capacity of cutter–loaders and the production loss connected with the replacement of cutter picks and drums are recommended.

Keywords: coal seam, cutting drum, reliability, cutter pick wear, cutter support, coal seam properties, cutter–loader capacity, feed speed, input power, energy content.
For citation:

Linnik Yu. N., Linnik V. Yu., Zhabin A. B., Zich A. Patterns of influence exerted by cutting drum reliability and coal seam properties on cutter–loader capacity. MIAB. Mining Inf. Anal. Bull. 2021;(11):169-180. [In Russ]. DOI: 10.25018/0236_1493_2021_11_0_169.

Acknowledgements:
Issue number: 11
Year: 2021
Page number: 169-180
ISBN: 0236-1493
UDK: 622-1/-9, 622.023
DOI: 10.25018/0236_1493_2021_11_0_169
Article receipt date: 06.09.2021
Date of review receipt: 16.09.2021
Date of the editorial board′s decision on the article′s publishing: 10.10.2021
About authors:

Yu.N. Linnik1, Dr. Sci. (Eng.), Professor,
V.Yu. Linnik1, Dr. Sci. (Econ.), Assistant Professor, Professor, e-mail: vy_linnik@guu.ru,
A.B. Zhabin, Dr. Sci. (Eng.), Professor, Tula State University, 300012, Tula, Russia, Full Member of the Academy of Mining Sciences,
A. Zich, Dr. Sci. (Eng.), Energy and Environmental Management Representative, Ontex Hygieneartikel, Germany, Grospostwitz,
1 State University of Management, 109542, Moscow, Russia.

 

For contacts:

V.Yu. Linnik, e-mail: e-mail: vy_linnik@guu.ru.

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