Jaw crushers
The distinctive feature of this class of crusher is the two plates which open and shut like animal jaws (Grieco and Grieco, 1985). The jaws are set at an acute angle to each other, and one jaw is pivoted so that it swings relative to the other fixed jaw. Material fed into the jaws is alternately nipped and released to fall further into the crushing chamber. Eventually it falls from the discharge aperture.