How NGS Impact Crushers Work
The NGS Impact Crusher is an Andreas-style impactor with basic features like disc rotors, reversible hammers, common wear liners, and hydraulic hood for access. However, the NGS advantage begins with the material flowing down a feed chute at an optimal angle. The feed chute allows the material to enter the rotor circle at a precise point where the hammers have the greatest affect in shattering the rock. The geometry of the primary curtain contains the initial spray of shattered rock and diverts the rock back into the hammer circle. The secondary curtain then receives a similar spray of finer particles as the material works its way around the rotor, coming into contact repeatedly with the hammers.
A dual curtain impactor typically provides a 10:1 reduction in a limestone material. The NGS Impact Crusher offers the option of a third curtain, which in some applications may provide more than a 20:1 reduction. As with all Universal impactors, the NGS Impact Crusher provides a greater level of control over the flow of the material through the reduction process. The hammer profile in the NGS is an S-shape, which provides a protruding leading edge. As the hammer wears down, it continues to strike the stone with a sharp edge. This keeps the material flow more centered on the curtains. As the hammers wear, the gap between the hammer tip and the curtains becomes greater. Measuring from the bottom edge of the curtain, when the gap expands with every 1” of hammer wear, the resulting output gradation will become noticeably coarser.
The NGS Impact Crusher is extremely easy to adjust, no heavy wrenches or cheater bars needed. All it takes is a simple pull on the hydraulic lever. Then, lift the shims from the cradle, secure them in the shim pack with a thumb-screw, and let off the hydraulic cylinder. Check the gap through the inspection door, and you're done.
When the hammers are spent, the replacement process is quick and easy. A rotor lock and special lifting tool is included with every NGS Impactor as a safety-first initiative. Once the new hammers are in place, reset the curtain gaps, and the crusher is ready.
With any Impact Crusher, it is always important to check for loose hardware. We are proud of the fact that our NGS line of crushers have the largest inspection and maintenance doors of any secondary impactor on the market. Access is critical. Providing more visibility empowers operators to be more proactive. McLanahan now offers the NGS Impactor with the ability to be adjusted while under full load. Watch the discharge conveyor, and allow the rock to grow or shrink with the touch of a finger.
Want even more control? We offer a complete automation program with touchscreen to adjust the gap settings either for hammer wear or ever-changing product demands. This full automation feature also includes hands-free calibration capability. Just give the command and let the crusher adjust accordingly.