Promising model range career excavators operating time assessment in real operating conditions

Abstract

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.

Investigation of the Destruction Process of Potash Ore with a Single Cutter Using Promising Cross Cutting Pattern

“…The problem of increasing the efficiency of the machine mining of potash and magnesium ores by reducing the specific energy costs for the potash ore cutting with the cutters of mining combines and by increasing the number of fractions that are easily enriched in the ore is still very important for the enterprises of the potash industry in Russia [1]. The solution of this problem is possible with balanced contribution to the development of new and improvement of existing designs of rock cutting elements of mining combines used in the extraction of potash and magnesium ores [2,3]. Nowadays, local "Ural" heading-and-winning machines manufactured at the Kopeysk Machine-Building Plant (Kopeysk, Russia) are the most widely used ones in the potash mines of Russia and the CIS countries.…”

Thermal Fatigue Modelling of Excavator Teeth During Cyclic Heat Loading

“…Авторы исследования [17] для определения остаточного ресурса также прибегают к оценке изменения твердости поверхностного слоя. Подобные исследования позволяют скорректировать график работ по техническому обслуживанию и ремонту экскаваторов [18]. Как уже было отмечено, на ускорение процесса абразивного изнашивания влияют не только повышенные температуры, но и продолжительное циклическое воздействие высоких температур, что уменьшает ресурс зубьев вследствие термической усталости.…”

Analysis of the screw press mouthpiece parameters for 3D extrusion of peat pieces of tubular type

“…Часто торфяные массивы естественного залегания имеют мощный верхний слой слаборазложившегося торфа. Практический интерес представляет процесс обогащения торфяного сырья непосредственно при его выемке ковшом экскаватора [6]. В этом случае выемка торфяного сырья происходит со всей глубины залежи путем срезания режущей кромкой ковша стружки с откоса карьера.…”