FIELD: materials crashing. SUBSTANCE: double-step rolls are installed symmetrically in relation to longitudinal axis to form discharge opening. Loading arrangement is made in the form of two longitudinal stationary sides and two cross sides capable to be moved along surface of roll steps and to be fixed relative to longitudinal sides for limiting lengths of working surfaces of roll steps, which are determined with the use of two respective equations. EFFECT: improved accuracy and enlarged range of controlling grain composition of crushed material at preset efficiency. 2 cl, 1 dwg
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