Resumen
The influence of the content of crushed material in the intra-chamber grinding fill on the efficiency of the self-oscillatory grinding process in the tumbling mill was assessed.A dynamic effect of a significant decrease in self-oscillatory action of the two-fraction fill of the rotary chamber with an increase in the content of fine fraction was revealed by the method of visual analysis of motion patterns. A decrease in values of the following inertial fill parameters was established: maximum dilatancy ?max, the relative amplitude of self-oscillations ?R? and a maximum share of the active part ?fam max with an increase in the degree of filling the gaps between particles of the coarse fraction ?mbgr. A decrease in the generalized complex degree of dynamic activation Ka was also established. The effect is due to the strengthening of the cohesive properties of the incoherent coarse fraction under the influence of the fine fraction. There was a decrease in by 29 % for ?max, by 7 % for ?R?, 2.9 times for ?fam max and 4.2 times for Ka with an increase in ?mbgr from 0 to 1 at the degree of filling the chamber with the fill ?br=0.45.Technological effect of a significant decrease in specific energy intensity and an increase in productivity of the innovative self-oscillatory grinding process in comparison with characteristics of the conventional steady-state process at a decrease in the content of crushed material in the fill was established.A process of milling cement clinker with grinding bodies at relative size of 0.026 and ?br=0.45 was considered. A decrease in specific energy intensity by 27 % at ?mbgr=1, by 38 % at ?mbgr=0.5625 and by 44 % at ?mbgr=0 was found. An increase in relative productivity by 7 % at ?mbgr=1, by 26 % at ?mbgr=0.5625 and by 39 % at ?mbgr=0.125 was established.The established effects will make it possible to forecast rational parameters of the self-oscillatory grinding process in a tumbling mill at the variation of the content of the crushed material in the fill