Investigations into the movement of milled medium in the bowl of a ring-roller mill

This paper presents the results of testing the grind material movement in a ring-roller milling system. The tests were carried out in a 1:4 scale model of an RP-1043x`milling system. The aim of the test was to determine material bulk shapes within a range of parameter changes of a model grinding system i.e. table–roller distancing, pile-up ring height, coal feed and tableʹs rotary speed. Based on the measurements of material layer thickness on the table, its average radial velocity was calculated. The results were then supplemented with tests based on the movement of markers over the surface layer of the coal bulk. These tests enabled the materialʹs average radial and tangential velocities in the surface layer to be determined.