GB428742A - Improvements in rock crushers - Google Patents

Abstract

428,742. Conical mills; gyratory crushers. BROWNING, R. E., 4380, Grand Boulevard, Montreal, Canada. July 14, 1934, No. 20694. [Class 59] Each crushing member rotates about an axis inclined to the other, the upper portions of the crushing members being concentric with their axes of rotation but eccentric to each other, whilst the lower portions of the crushing members are concentric with their axes of rotation and with each other but travel in relatively inclined planes or paths. As shown, the rotary crushing head 11 is mounted on a spigot 11<a> and secured by bolts 37 to a skirt 10<a> of a hollow shaft 10 mounted in bearings 14, 20 and driven from a shaft 28 through bevel gear 27, 19. The head is provided with ribs b and revolves inside a crushing surface 38<a> provided with ribs and secured by bolts 40 to a casing 39 revoluble in bearings 47, 48. The bearing 47 is adjustable by worm-wheel 62 and worm 63 and the outer casing 52 which carries the crushing surface 38<a> is held down by bolts 72 and springs 75. The casing 52 seats on a ring 65 adjustable vertically by worm 68 to vary the distance between the crushing surfaces. The axis of crushing surface 38<a> is inclined to the axis of the head 11 and intersects the latter at A, the crushing surfaces of both members being concentric at 38<c>. A circular dust protector 81 is attached to bolts 86 and ribs 79, 101 prevent access of dust to the bearings. The material to be crushed is fed through an orifice 90 and is crushed by the ribs b with combined pressure and twisting action due to the inclination of the surface 38<a> relatively to the head 11 and to rotation of the surface 38<a> due to frictional contact with the head. In Fig. 3 the head 11 is mounted on a rotary shaft 10 and the opposed crushing surface 38 is rotatable by frictional contact with the head. The surface 38 is carried by members 103, 104 forming a kind of ball joint with the casing 114, which is held down by spring bolts 115, and with the gap-adjusting casing 109. Uncrushable material causes the surface to rise vertically and rotate with the head 11 until it is cleared or the mill stopped. When the crushing gap is altered the ball joint automatically adjusts itself for a uniform discharge gap and the set screws 211 are then adjusted to this position.