## VALUE AND NUMBER OF OPTIMAL GEAR CHANGE LEVELS FOR CONVEYOR BELT VELOCITY

The article addresses an approach to improvement of mine belt conveyor efficiency. Transported material enters conveyor nonuniformly, and, therefore, conveying at constant velocity results in increased cost of transportation. The haul cost can be cut down through accommodation of the conveyor belt velocity and transportation volume per minute. The haulage regulation can be continuous and discrete. In the discrete regulation, the belt velocity is changed stepwise as soon as the material flow volume reaches a certain level. Thus, determination of the number and values of such levels is a key problem to be solved in order to synthesize a discrete automatic control of belt velocity. The calculation method is proposed for optimal threshold values of material flow volume to trigger the belt velocity change. The gear change levels are obtained from the conditions of minimum average velocity of belt and maximum productiveness of mining machine. The regulation quality is assessed for different number of the discrete regulation levels. The assessment is implemented by mathematical expectation of ratio between the unit load with velocity regulation and the rated unit load. The authors arrive to a conclusion on inexpediency of more than four gear change levels since regulation quality grows insignificantly with an increase in their number. On the other hand, considerable improvement in regulation quality is achievable through calculations with modified Gaussian distribution, namely, truncated distribution.

*For citation: **Dmitrieva V. V., Sizin P. E. Value and number of optimal gear change levels for conveyor belt velocity. MIAB. Mining Inf. Anal. Bull. 2019;(6):147-155. [In Russ]. DOI: 10.25018/0236-1493-**2019-06-0-147-155.*

**№**: 6

2019

**ISBN**: 0236-1493

**УДК**: 622.647.2:004.942

**DOI**: 10.25018/0236-1493-2019-06-0-147-155

**Authors**: Dmitrieva V. V., Sizin P. E.

**Authors' Information**:

V.V. Dmitrieva, Cand. Sci. (Eng.), Assistant Professor, Gubkin Russian State University of Oil and Gas (National Research University),

119991, Moscow, Russia, e-mail: dm-valeriya@yandex.ru,

P.E. Sizin, Cand. Sci. (Phys. Mathem.), e-mail: mstranger@list.ru, Institute of Basic Education,

National University of Science and Technology «MISiS»,

119049, Moscow, Russia.

Corresponding author: V.V. Dmitrieva, e-mail: dm-valeriya@yandex.ru.

**Key words**:

Belt conveyor, random material flow, Gaussian distribution, discrete velocity regulation, unit load, optimal gear change levels, regulation quality.

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