Jaw Crusher

Overview

A jaw crusher performs the first stage of size reduction, taking run-of-mine rock up to about a metre across and breaking it into coarse fragments for downstream crushing or milling. The single-toggle design squeezes material between a fixed jaw and a swinging jaw, the gap narrowing toward the bottom so each bite drops the rock further into the chamber until it passes the discharge opening.

The crushing chamber is formed by the Main Frame, a heavy welded-and-cast steel body that carries all crushing loads and houses the side cheek plates. The wearing faces are the Jaw Plates: replaceable manganese-steel dies bolted to both the fixed jaw and the moving jaw, locked by wedges and renewed as they abrade.

How it works

Drive comes from the Drive Motor through the Flywheel & Belt Drive, where a multi-groove V-belt set spins two large flywheels. Their stored inertia carries the machine through the heavy crushing stroke and smooths the load on the motor. The flywheels turn the Eccentric Shaft Assembly, a forged shaft whose eccentric centre section rides spherical roller bearings.

The Swing Jaw (Pitman), or pitman, hangs on that eccentric, so each shaft revolution swings the movable jaw toward and away from the fixed jaw, crushing rock on the closing stroke and letting it fall on the opening stroke. The bottom of the pitman is held against the Toggle Mechanism, whose toggle plate reacts the crushing force and acts as a mechanical fuse, failing first if an uncrushable tramp object enters.

Product size is set by the CSS Adjustment, a hydraulic wedge that raises or lowers the closed-side setting at the discharge. The Lubrication System feeds the eccentric bearings continuously, while a Control Panel starts the motor and monitors bearing temperature and vibration for protection.