2. GYRATORY CRUSHERS
2017-4-19 · The crushing action itself is simple. There is a fixed crushing surface known as the concaves which is w I'' FIG. 24. Sectional view of hydraulic support .~sembly (COURB~ of Allir-Chi- men). Legend: (I) main sh.A, (2) thrust-bearing wbly. (3) hydraulic piston. basically the frustum of an inverted cone. A movable crushing surface