The development prospects of the mining industry are closely related to the state and development of modern mining machinery and equipment that meet the technical and quality requirements of mining enterprises. Enterprises are focused on a quantitative assessment – the volume of mineral extraction, depending on the functioning efficiency of a promising series of mining machines, which include modern mining excavators. Downtime and unplanned shutdowns of mining excavators directly depend on the operating conditions of the mining machine, which has negative influence on the machine as a whole and its technical condition, which entails a decrease in the efficiency of using expensive mining equipment and economic losses of the mining enterprise. The rationale for external factors that affect the operating time and technical condition of mining excavators is given. For a more detailed assessment of the influence of external influences on the efficiency of operation of mining machines, the influencing factors are divided into two groups: ergatic, directly related to human participation, and factors of a natural-technogenic nature, where human participation is minimized. It was revealed that factors of a natural-technogenic nature have the greatest influence. An algorithm is proposed for a comprehensive assessment of the technical condition and forecasting of operating time both in nominal and in real operating conditions, taking into account factors of a natural and technogenic nature. It is proposed, based on the developed program for planning and evaluating the life of a mining excavator, to adjust the schedules for maintenance and repair (MOT and R) in order to minimize the number of unplanned downtime of a mining excavator and maintain it in good condition.
The paper considers the influence of the main design parameters of the front-end equipment of mining shovels - outreach and bucket capacity for dynamic component of the drive load lifting. The dynamic equivalent circuit of the cable-sheave block system, the expressions to determine the stiffness of the system, made and agreed differential equation of motion, determine the range of natural frequencies of the system, the amplitude-frequency response of the gain of the external load on the length of the boom and bucket capacity.
The analytical dependences linking geometric parameters required to calculate the forces and capacities of the main drives of the quarry excavator, with its design dimensions and parameters of the face are given and substantiated. The use of these dependences greatly facilitates and accelerates the operational calculations, as it eliminates the elements of a graphic solution.
