Hammer Mill

Hammer mills consist of a series of hammers (usually four or more) hinged on a central shaft and enclosed within a rigid metal case. It produces size reduction by impact. The materials to be milled are struck by these rectangular pieces of hardened steel (ganged hammer) which rotates at high speed inside the chamber.

These radically swinging hammers (from the rotating central shaft) moves at a high angular velocity causing brittle fracture of the feed material. Hammer mills crush materials into two (2) stages.

• Size reduction which occurs by dynamic impact.
•  Sizing which occurs by attrition and shear in the second zone were small clearance exists between the hammer and the screen bar producing a particle range of 15-50 micrometer.