NUST MISIS Branch in Novotroitsk, Novotroitsk, Russia:

A. V. Nefedov, Associate Professor, Candidate of Pedagogical Sciences
A. V. Tanchuk, Student

NUST MISIS, Moscow, Russia:
N. A. Chichenev, Professor, Doctor of Engineering Sciences, chich38@mail.ru

Severization of quality standards imposed on process machines and equipment toward reduction in the material, labor and financial expenditures connected with maintenance and repair dictates reengineering to be undertaken. The article presents the design analysis of round car tippler model OKE2-4.5-750A in service at the 10^th Anniversary of Independence of Kazakhstan Mine of Donskoy Mining and Processing Plant, Kazchrome. It is shown that extreme operating conditions (increased dampness, dustiness, temperature changes, gas contamination, foreign substances, dust, rocks, and dirt hitting the surface of drive rollers) often lead to a malfunction of the electric drive. To increase the operational reliability and service life of the tippler drive, it is proposed to modernize it by switching from four drives for rotation of the drum to two drives with electric motors of higher capacity, with placement of the drives along the diagonal of the drum. As a result of the car tippler drive modernization, it was succeeded to simplify its design, and to reduce the labor intensity of maintenance and repair by 20 hours per year. Replacement of four drives for drum rotation by two drives with electric motors of higher capacity increases their reliability, allows extending the turnaround time and thereby reducing the operating costs. The calculations show that the implementation of the design solutions leads to a decrease in the production cost of one ton of ore by 1.32%, to an increase in the product profitability by 5.19 % and to an increase in the labor productivity by 0.36%. The additional capital costs do not exceed 200 thousand rubles and the pay-off period is less than 2 months.

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