FIELD: mechanical engineering. SUBSTANCE: grinder has frame with hopper, and upper and lower grinding rotors horizontally arranged in single housing. Upper rotor has conveying screw whose coils are attached on upper rotor shaft, between its cutters. Lower rotor is made of hammer type and is equipped with suction fans. Axes of rotation of upper and lower rotors are arranged in mutually perpendicular planes, with lower rotor being overlapped with respect to upper rotor by value of up to 0.5 the diameter of lower rotor. EFFECT: increased quality of ground material and enhanced reliability in operation. 2 cl, 5 dwg
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