Review of the structure of unscheduled faults of friction assembly of BelAZ dump trucks at the Chernogorsky mill

Today, reducing the number of sudden failures and the time spent by mining equipment in maintenance is an urgent and priority task at all mining enterprises in Russia. The largest part of the costs are the costs associated with maintaining the performance of mining dump trucks. This is due to the increase in prices for new units of equipment, spare parts, fuel, and lubricants. Dump trucks are the most common mining and transport equipment, as they have increased maneuverability, have greater cross-country ability, and also increase the productivity of excavators. Domestic enterprises mainly operate dump trucks manufactured by the Belarusian company OAO BelAZ. They are well studied and most suitable for operation in modern conditions at coal mining enterprises in Russia. In order to determine the possibilities of reducing the duration of the equipment being under maintenance and increasing the time of its operation, an analysis was made of the data of sudden failures of BelAZ mining dump trucks for the period from 2018 to 2021 at the Chernogorsky open pit. All sudden maintenances were structured into groups. The main units, including friction units, were combined into a separate group. Because the operation of the BelAZ mining dump truck depends on the main units. During the analysis of the database, it was found that over four years the average share of sudden failures attributable to the main units ranged from 12 % to 16 %. Despite the annual renewal of the fleet with new dump trucks, the share of sudden failures of the main units remains about 14%. The authors gave recommendations to reduce the number and duration of downtime for BelAZ mining dump trucks under maintenance.