Ural State Mining University, Yekaterinburg, Russia:

A. P. Komissarov, Professor, Doctor of Engineering Sciences
Yu. A. Lagunova, Professor, Doctor of Engineering Sciences, yu.lagunova@mail.ru
V. S. Shestakov, Professor, Candidate of Engineering Sciences
I. Yu. Ivanov, Associate Professor, Candidate of Engineering Sciences

Despite an increase in the bucket capacity and weight, performance of excavators remains on the same level conformable with the energy demand (power-to-weight ratio) per each shoveling machine type (electromechanical or hydraulic). Energy demand is governed by the type of working attachments, ratio of the linear and weight parameters and some other factors. It is found that hydraulic excavators having much higher capacity buckets as compared with power shovels at the same weight feature an increased installed power of driving motors (energy demand) due to the higher external load – digging resistance. The proposed layout diagram of working attachments with closed-circuit of workloads involves two opposite-arranged buckets and a closing circuit mechanism. The implementation of the proposed layout diagram of working attachments with the closed-circuit workloads reduces loading and weight of the bucket at the same capacity. The energy efficiency index is offered to characterize relative bucket capacity at certain energy demand.

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