Impact crusher

Abstract

A centrifugal rock crusher having a cylindrical housing with a rotatively driven impeller disposed concentrically therein with a plurality of impeller vanes disposed uniformly around the impeller defining channels through which rock to be crushed is centrifugally thrown against a plurality of uniformly concentrically spaced anvils secured within the housing adjacent the impeller. The impeller is generally formed of a pair of vertically spaced upper and lower disc-shaped members which support the impeller vanes between them and together define the channels through which the rock to be crushed is thrown. Upper and lower wear plates are respectively secured to the upper and lower disc-shaped members and are angled downwardly to direct the trajectory of rocks thrown from the impeller generally horizontally against the anvils. The anvils are radially disposed in two concentric rows around the inside of the cylindrical housing with adjacent anvils being in different rows so as to present a staggered anvil pattern. The anvils are split in a vertical radial plane through the axis of rotation of the impeller so that as the anvils are worn down a hard surface portion is presented to the impacting rocks. The impeller vanes are generally triangular in horizontal cross section and have a radiused nose portion which substantially reduces the wear and destruction of the vanes. In the central portion of the impeller is a landing cone upon which the rock to be crushed is deposited and which is angled downwardly towards the channels to permit the rock to migrate into the channels before it is thrown against the anvils. The angle of slope of the cone is designed to optimize the delivery from the landing cone to the channels.