The CJC-90 jaw crusher is a primary crushing machine for medium-capacity plants. This section covers the materials it accepts, the products it generates, its typical industries and the operating factors that affect performance and maintenance.
What Materials Can the CJC-90 Process?
The CJC-90 is built for primary crushing of natural rock and recycled mineral feed, including:
- Limestone and dolomite
- Granite, basalt and other hard igneous rock
- River gravel and quarried stone
- Reinforced concrete and demolition material in recycling work
Feed must be sized to enter the 900 x 650 mm opening; oversized blocks should be reduced before charging. The compression crushing action lets the CJC-90 take on abrasive, high-strength rock that would wear an impact machine quickly.
What Products Does It Produce?
The CJC-90 delivers a coarse, unscreened primary product with a top size governed by the closed side setting (50-150 mm). This is an intermediate feed for secondary crushers and screens, which produce the finished concrete and asphalt aggregate fractions, base course and finer sizes. A tighter CSS narrows the primary gradation and eases the duty on the secondary stage; a wider CSS lifts throughput at a coarser top size.
Which Industries Use This Crusher?
- Medium-capacity quarries and aggregate plants
- Concrete and asphalt producers operating their own crushing line
- Construction and demolition recycling
- Mining and mineral processing operations
At roughly 11,400 kg with a 75 kW drive, it is a frequent primary choice for established producers stepping up from a small first-stage machine to higher, sustained tonnage.
How Are Wear Parts Managed?
The fixed and moving jaw plates are the main wear parts, made from manganese steel that hardens under load. Their life depends on feed abrasiveness and tonnage, and both are reversible to extend service before replacement. The cheek plates protecting the chamber side walls and the toggle plate are also serviceable items. The toggle plate doubles as a safety device, designed to break if uncrushable tramp metal enters the chamber and so protect the crusher body and drive. Stocking spare jaw plates shortens scheduled changeovers.
What Should Be Considered During Operation?
Choke feeding keeps the chamber full and produces uniform product with even jaw wear. After any plate change, the closed side setting should be verified with the hydraulic mechanism. Maintaining drive belt tension, flywheel balance and consistent lubrication keeps the machine running smoothly at its 277 rpm flywheel speed. A vibrating grizzly feeder ahead of the crusher scalps fines and regulates the feed rate, protecting the jaws and stabilising output.
Jaw Crusher Versus Impact Crusher
The CJC-90 reduces material by compression and is the preferred primary machine for hard, abrasive rock and reinforced concrete. A primary impact crusher reduces by impact and gives a cubical product with a higher reduction ratio, but is better matched to softer, less abrasive limestone. Where feed is hard granite or basalt, the jaw crusher offers lower wear cost and longer component life as the primary stage, because compression handles high-strength rock without the rapid blow-bar wear an impact crusher would suffer.
