PRESSURE ROLL GRINDER Russian patent published in 1997 - IPC

FIELD: mining, coal, chemical and building materials industries; grinding carbonate and alumosilicate ores, clinker and technogeneous materials. SUBSTANCE: pressure roll grinder has shell 1 accommodating rolls 2 and 3 placed in a spaced relation to each other and made in the form of drums 4 and 5. Mounted on the drums are segments of bow-shaped profile along the axes of the rolls. One of the drums carries convex segments 11 and the other one has concave segments 10. The segments are prestressed with the aid of wedges 7,8. The segments are secured by means of dolts 6 in the central portion of the drum surfaces and are arranged so that sunk segments 11, 12 are disposed between projecting segments 9, 10. All the segments are provided with end and central bosses having inclined grooves resting on wedges installed in longitudinal grooves of mounting drums and made in the form of a taper key with inclined end face surfaces. The wedge angles are equal to α = 30 to 50 deg in the central part of the segment and b = 50 to 75 deg at the sides. EFFECT: improved quality of grained product. 6 dwg