Q: How does the “Two-Stage Crushing” system actually work?
The machine is vertically stacked. The upper two rollers catch the incoming raw material (up to 200mm) and perform coarse crushing through extrusion. The material then falls naturally into the lower two rollers, which are set at a tighter gap for precision fine grinding. This means you get a finished product in a single pass without needing a secondary crusher or return conveyor.
Q: Can this machine handle wet limestone or coal gangue?
Absolutely. Unlike traditional hammer or jaw crushers that rely on internal screens which easily blind with moisture, our screen-less design allows materials with up to 30% moisture to pass through via low-speed extrusion. This fundamentally eliminates clogging and ensures continuous operation during rainy seasons or for high-humidity ores.
Q: What is “On-site Surfacing Repair” for the rollers?
To reduce your downtime and costs, our roller surfaces are made with high-chromium manganese alloy that supports re-welding on-site. If the rollers show wear after heavy use, you don’t need to replace the entire core. A technician can resurface the rolls using specialized welding rods right at your facility, restoring the original crushing profile and extending the equipment’s lifespan indefinitely.
Q: What happens if an unbreakable object (like a loader tooth) enters the machine?
APEX Four-Roll Crushers are equipped with a spring or hydraulic automatic retreat device. When an object harder than the crushing limit is detected, the rollers move back to allow the object to fall through, then instantly reset to their original position. This “safety valve” protects your motor, shafts, and roller skins from catastrophic damage.
