National University of Science and Technology MISIS, Moscow, Russia:

A. K. Malinovskiy, Professor, Doctor of Engineering Sciences, +7 (499) 230-23-35

The studies into emergency braking mode of mine hoists of all sizes show that none of mine hoisting machines possesses admissible deceleration of 5 m/s², which is confirmed by the data of audit of the emergency braking indexes, namely, idle run time t_idle = 0.5 s and statistical reliability factor K_rel = 3. It is shown that it is possible to improve emergency braking by simultaneous decrease in tidle and increase in Krel. But the concurrent reduction embraces maximum braking effort on emergency brake shoes and drum speed subjected to the influence of brake shoes. This results in intensive wear of braking shoes, which shortens their life. Higher efficiency of emergency braking is achievable through implementation of two braking modes (mechanical and electrical) concurrently, which, according to the studies, irregardless of type of a hoisting machine, enables backing-up of mechanical braking in case of failure of electrical brake. This approach is particularly efficient when the initial hoisting machine velocity is 11.5 m/s, and maximum deceleration of 5 m/s² is achieved through the increase in K_rel and reduction in t_idle, which brings down wear of braking shoes and drum shell, and extends their lives.

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