The CJC-140 jaw crusher is the largest primary crushing machine in the CONSTMACH range, built for maximum-volume mining and quarry duty. This section covers the feed it handles, the products it generates, its industries and the operating and maintenance considerations at this scale.
What Materials Can the CJC-140 Process?
The CJC-140 is built for primary crushing of the hardest, most abrasive rock and mining feed, including:
- Granite, basalt and other hard igneous rock
- Dense mining ore
- Limestone and dolomite
- Very large quarried stone
The 1,400 x 1,100 mm opening accepts the largest run-of-mine blocks in the range, minimising pre-breaking. The compression crushing action makes it suited to the hardest, most abrasive ore and rock at maximum tonnage.
What Products Does It Produce?
The CJC-140 produces a coarse, unscreened primary product whose top size is set by the closed side setting (120-280 mm). This material feeds the secondary and tertiary crushers and screens that produce finished aggregate fractions or sized process feed. The coarse CSS range matches the machine's maximum-capacity role: wider settings drive throughput toward the upper 850 t/h figure, while tighter settings supply a more uniform feed to the downstream stages.
Which Industries Use This Crusher?
- Large mining and mineral processing operations
- High-volume quarries and aggregate plants
- Major infrastructure aggregate supply
- Heavy material processing at maximum capacity
At approximately 52,000 kg with a 200 kW drive, it is reserved for the highest-volume sites where the primary stage must never be the bottleneck.
How Are Wear Parts Managed?
The fixed and moving manganese steel jaw plates carry the wear. At the tonnages this crusher handles, plate management is a planned maintenance discipline: plates are reversed to extend life and replaced during scheduled stops to avoid unplanned downtime. The cheek plates protecting the chamber side walls are also serviceable. The toggle plate acts as a mechanical fuse, breaking to protect the machine if uncrushable tramp metal enters the chamber. Keeping spare jaw plates on site is standard practice, as changeovers on a machine of this size occupy significant planned downtime.
What Should Be Considered During Operation?
Choke feeding maintains a full chamber for uniform product and even jaw wear, which is essential at maximum tonnage. The closed side setting should be confirmed with the hydraulic mechanism after each plate change. Reliable lubrication, correct drive tension and a balanced flywheel are critical for smooth running at the 220 rpm flywheel speed under the heaviest load in the range. A heavy-duty vibrating grizzly feeder ahead of the crusher scalps fines and meters the feed, protecting the jaws and steadying the high throughput.
Jaw Crusher Versus Impact Crusher
The CJC-140 reduces material by compression and is the correct primary machine for the hardest, most abrasive rock and ore at maximum capacity. A primary impact crusher reduces by impact for a cubical product and high reduction ratio, but suits softer limestone feed and wears rapidly on abrasive rock. For the largest hard-rock mining and quarry duty, the jaw crusher is the durable, lower-wear primary solution, since its compression action processes dense, high-strength material without the rapid blow-bar wear abrasive ore would cause in an impact crusher.
