Extracting-and-loading dragline with innovative design bucket

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

“…The hydraulic circuit of the electrohydromechanical rotary-feeding mechanism ensures its reliable and smooth operation both during startup and during various drilling modes. The main elements of the hydraulic system are [4,12,14,18]:…”

“…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 possibility of regulating the speed of the rotator by changing the amount of sliding of the hydraulic machine has been proven. The high safety properties of the drive have been confirmed [4,10,17,18]. Industrial tests revealed shortcomings in the rotator design, which require the following measures:…”

“…Developing coal and gold mining at an accelerated pace using progressive open-pit methods will increase its share in total production by no less than 45%. Reduce the cost of products and work in industry by 4-5% [1,7,9,18,20].…”

Evaluation of Effect of the Excavator Cycle Duration on its Productivity

“…The main factors that affect the productivity of the excavation-and-loading complex are the following: condition and reliability of the excavator, its technical characteristics [1][2][3][4]; timely delivery of dump trucks, which in its turn depends on the organization of work, quality of road surface [5], supply of spare parts, fuel and energy; quality of the face [6,15], estimated by its height, conditions of transport approach to the place of loading; the qualification of the excavator operator; condition and category of rocks, which characterizes the labor intensity of rock mass excavation [7][8][9][10]; quality of blasting of rocks; thickness of the excavated layer at digging; the bucket filling ratio; length of digging trajectory for full bucket filling [11][12][13]; width of the cutting edge of the excavator bucket; technological scheme of working off the bench; the place of installation of an excavator when working off the bench [14]; the load capacity of the dump truck [16]; the angle of rotation of the bucket during loading [17][18][19][20]; loading method [21]; the length of the worked-out rock block [22]; coefficient of fragmentation of rock in the excavator bucket; climatic conditions [23].…”