Full definition
The primary size reduction machine in most mining and quarrying operations, reducing run-of-mine rock from up to 1,500 mm to 100-300 mm by compression between two heavy steel jaw plates — one fixed to the frame and one oscillating (swinging) on an eccentric shaft. The toggle mechanism converts rotary motion to the reciprocating crushing stroke. Feed opening: 400×600 mm (small) to 1,600×2,100 mm (large mining). Capacity: 50-2,000+ t/h. Crushing ratio: typically 4:1 to 8:1. Reduction ratio: CSS (closed-side setting) is adjustable by shimming or hydraulic cylinder. Jaw plate material: high-manganese austenitic steel (12-22% Mn, Hadfield steel) that work-hardens from 200 to 500+ HBN under impact. Types: single-toggle (simpler, more common, higher throughput) and double-toggle (more compressive, less wear, for very hard rock). Power: 30-400 kW depending on size. Rubber components in jaw crusher circuits: feed hopper linings (NR for impact protection), discharge chute linings, drive belts (V-belts driving the eccentric shaft — typically 4-8 SPC or 8V belts), anti-vibration mounting pads, and dust curtains. OEM brands: Metso Outotec (C series — most widely installed globally), Sandvik (CJ series), and FLSmidth.