Theoretical generalization of modes and modeling of performance criteria of cutter-loaders

Criteria for assessing the performance of mining and transport equipment of mining enterprises

“…According to the studies of N. G. Dombrovsky [5], R. Y. Poderny [6][7][8]11], Y. I. Belyakov [3][4]15], we propose to determine the technical productivity of single-bucket mining excavators by the formula: Where E -excavator bucket capacity, m 3 ; K e -excavation coefficient; K rt -coefficient of technical productivity realisation in the process of operation, K u -coefficient of quarry excavators use in time; K p -level of excavator face preparation perfection; K c -level of excavator technical condition; K pt -level of professional training and activity of excavator driver; K cc -coefficient taking into account climatic conditions; P(t) -probability of excavator failure-free operation; K F -coefficient of specific resistance, MN/m 2 ; N l -engine power of lifting mechanism, kW; η l -efficiency of lifting mechanism; I -moment of inertia of rotating parts of the excavator; N tur -engine power of turning mechanism, kW; η tur -efficiency of turning mechanism; β -turning angle, rad; t b.u -bucket unloading time, t b.u = t′ b.u +t o , s; t′ b.u -time of bucket unloading depending on the property of rock mass, s; t o -switching on and triggering the mechanism of opening the bottom of the excavator bucket, s; t cw -duration of continuous work of the excavator from one place of installation, s; t m -duration of one movement, s; On the basis of conducted studies of workplace preparation for excavators of different bucket capacity and data of timekeeping observations, as well as taking into account the influence of lumpiness of blasted rock mass and the average size of rock pieces on the excavation process to determine the shift operational productivity is recommended the following analytical dependence: Substituting the value of Q e , instead of Q i , we obtain the technical functional criterion of the quarry excavator, i.e. the final useful effect of its functioning [9][10][12][13]]…”

“…At the present stage the most researched and the most fully reflecting the parameter of operating conditions U i is the coefficient of specific resistance to digging K F which, as it is known [3,11,16], in its turn, depends on the quality of face preparation. Yu.I.Belyakov recommends to determine the value of specific resistance to digging of blasted rock mass for single-bucket excavator [3,4,12,13]:…”

Development of technical solutions for modernization of the rotary feed mechanism of a quarry drilling rig

“…Designed to impart torque to the working body when drilling vertical and inclined wells in hard rocks (up to 20 on the scale of Prof. M.M. Protodyakonov) with a roller bit to a depth of up to 40 m in open-pit mining of ferrous and non-ferrous metallurgy, as well as in mining and chemical quarries industry and enterprises of the building materials industry, over the entire operating speed range of the DC drive electric motor DPV-52 (Figure 2) [5,6,11,[18][19][20]. The developed new design of the rotary-feeding mechanism, the kinematic and hydraulic diagram of the machine (Figure 2) gives it the properties of a hydraulic drive and allows you to significantly change the dynamic characteristics of the entire drilling rig during setup and operation, as well as gain new advantages over the traditional hydraulic drive, namely:…”

“…The developed design of the electro-hydromechanical rotational-feeding mechanism of a drilling rig, which allows, by forming a rational dynamic characteristic of the transmission, to significantly reduce vibrations, increase durability, and, as a consequence, the productivity of the machine [3,7,13,19].…”

Methodology for Calculating the Performance and Functionality of Quarry Excavators

“…The analytical dependence [22,[25][26][27][28] as follows below, is recommended for de�ining the shift operational productivity, as a result of conducted researches on preparation of workplaces for excavators of different bucket capacity and data of timekeeping observations as well as taking into account in�luence of lumpiness of blasted rock mass and average size of rock lumps on excavation process: (5) where: exp -base of the natural logarithm; d d -diameter of the average lump of the entire blasted rock mass, m.…”