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Mutual influence of loads on cutting picks at different coal cutting parameters

The analysis of mutual influence between loads applied to neighbor cutting picks aims to improve identification of the actual load spectrum on the attachments of cutter–loaders. The studies included cutting of coal-and-cement blocks on a surface planing machine and on a test bench representing a full-scale model of a cutter–loader. The adopted cutting parameters were the pitch of cutting, the spacing of cutting picks in the direction of cutting velocity and the chip thickness. It is found that instantaneous cutter loads on neighbor cutting picks in their mutual alignment show no linear correlation neither at constant nor at varied chip thickness. This is explained by the spacing between the cutting picks in the direction of the cutting velocity: the front of deformations generated by the rearward pick reaches the zone of action of the forward pick at a certain delay. The mutual influence of the cutter loads in time lies in the discovered fact that the change in the load on one cutting pick as a result of a large-size shear with a front indent facilitates shearing by the other pick at the end of the time lag. The mutual influence of the loads on neighbor picks in time has a periodic nature, and shows itself to the fullest extent when the cutting diagram parameters approach an optimal relationship.

Keywords: cutting, coal block, cutting force, shearing, front indent, mutual influence in cutting by paired picks, cutting pitch, chip thickness, correlation coefficient, coincidence interval.
For citation:

Linnik Yu. N., Linnik V. Yu. Mutual influence of loads on cutting picks at different coal cutting parameters. MIAB. Mining Inf. Anal. Bull. 2024;(5):133-143. [In Russ]. DOI: 10.25018/0236_1493_2024_5_0_133.

Acknowledgements:
Issue number: 5
Year: 2024
Page number: 133-143
ISBN: 0236-1493
UDK: 622-1/-9
DOI: 10.25018/0236_1493_2024_5_0_133
Article receipt date: 23.12.2023
Date of review receipt: 06.02.2024
Date of the editorial board′s decision on the article′s publishing: 10.04.2024
About authors:

Yu.N. Linnik1, Dr. Sci. (Eng.), Professor, Professor,
V.Yu. Linnik1, Dr. Sci. (Econ.), Assistant Professor, Professor, e-mail: vy_linnik@guu.ru,
1 State University of Management, 109542, Moscow, Russia.

 

For contacts:

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

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