FIELD: crushed rock mass size screening. SUBSTANCE: drum-type sizing screen has loading tray 4 and unloading tray 5, shells, one of which of bigger diameter is located from the side of loading tray; alternating fire-grates of different height from the side of loading tray. In the case fire-grates of bigger height are fixed to shell of smaller diameter as cantilever. Inclination angle of fire-grates is given in formula, given in description. EFFECT: simplified design. 3 dwg
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