FIELD: grinding equipment. SUBSTANCE: drum grinder has cylindrical drum with inner liner comprising interconnected separate plated rings with inner longitudinal lifting profiles. Each plate has step positioned on its rear side and having radial height exceeding height of front side. Each plated ring has several plates differing from one another by radial height of step and by material. Plates are circumferentially arranged in alternation in predetermined order and positioned in line along axial direction. Predetermined number of plates of one type are fixed to drum by bolts and remaining plates are fixed on related sites due to vault-forming effect. EFFECT: simplified construction and increased efficiency. 6 cl, 8 dwg
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