Известия Томского политехнического университета: Инжиниринг георесурсов (May 2022)
BOUNDARY TECHNICAL AND ECONOMIC INDICATORS OF THE APPLICABILITY FOR FRONT LOADERS WORKING AS EXCAVATION AND TRANSPORTATION MACHINES
Abstract
The relevance of increasing efficiency of mineral deposits mining requires the approach of the most economical mainline transport to the working area of the quarry. At multi-stage development of complex-structured deposits by deep quarries with relatively small sizes in plan (for example, gold, copper, and diamond ore quarries), it may be advisable to combine the functions of excavation and transportation in one machine. Objective: to determine the boundary technical and economic indicators of loaders when used both as excavation machines and transport vehicles. The indicators of the excavator-automobile complex in identical conditions are the boundary ones. Оbjects: modern high-performance loaders with bucket capacity of 10–40 m3 when lifting capacity of working equipment is of 20–72 tons and engine power is from 521 to 1715 kW, an excavator-automobile complex based on electromechanical excavators-shovels with bucket capacity of 12 m3, and dump trucks BelAZ-7513 with lifting capacity of 136 tons. Methods. The calculations of technical and economic indicators were carried out according to well-known methods described in the scientific and technical literature for cyclic action machines and front loaders. The operating conditions of the equipment are considered in the calculations belong in the range of rational for the excavator-automobile complex, which allows us to compare them with front-end loaders as efficiently as possible. Results. The calculated data on productivity, the cost of mining and transporting work executed by the loaders, depending on the distance of delivery, lifting height, annual productivity by rock mass, taking into account the standard type and size of the loaders (bucket capacity), are summarized. The boundary parameters of the preferred conditions for the use of loaders as excavation and transportation machines in comparison with excavator-automobile complexes are revealed. The paper gives the conclusion about the expediency of continuing research to substantiate the parameters of special excavation and transportation machines.
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