FIELD: hard rock grating equipment. SUBSTANCE: annular vibratory grater has supporting frame, outer grinding member fixed on supporting frame, vibration exciter, flexible members, and central destructing tool. Outer grinding member is made in the form of hollow cylinder assembled from rings arranged one above another and fixed inside frame for oscillating displacement around vertical axis. Adjacent rings are arranged for vibratory rocking in opposite phase. Flexible members of each ring are fixed on supporting frame for oscillating around vertical axis. Internal working surface of rings is made corrugated. Central destructing tool is formed as drum arranged coaxially inside hollow cylinder and is equipped with disk rigidly fixed on its lower end. Peripheral part of disk is arranged under terminating ring of hollow cylinder so as to define discharge slot and is provided with ground ore discharge device formed as plow. EFFECT: increased efficiency in destructing kimberlite ore while keeping diamond crystal. 2 dwg
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