April 18, 2011
KRHT-60E, the plant utilizes a New Holland type Williams 3-blow-bar impact crusher with Williams 6′ x 50′ apron feeder and Simplicity 7′ x 20′ grizzly bar scalping screen that can handle material up to 60″ lump size. The new plant measures 47′ high, 39′ wide, 122′ long (183′ with discharge conveyor) and weighs 1.2 million lb. The 120-ton hopper is 24′ wide, 29′ long, and 9½′ high. A built-on BTI hydraulic hammer breaks up oversize incoming materials. The plant was custom designed and built by Grasan for a large quarry in the southeastern United States.
The chassis mounting consists of two pairs of custom designed B9 tracks with 40″ wide smooth pads and self-leveling stabilizer legs. The twin-track unit is powered by two 300-hp electric motors, travels at ½ mph, and can turn at various angles up to 90 degrees.
The standard Williams crusher design has been modified to enlarge the hydraulic inlet opening for easier maintenance and replacement of the 1000-lb. blow bars. Two 500-hp electric motors supply power for the 3000-tph impactor. The 60″ x 75′ discharge conveyor is powered by twin 100-hp electric motors.
The PC-based electrical control system monitors every function of the crushing plant and will shut it down if any problem occurs. The system includes Allen Bradley full-voltage and redundant motor starters: 4161-volt for motors 200 hp and over; 480-volt for all others. The plant has the same kind of sophisticated filtering and sensing system as an aircraft. And outside programmers can access the system from a remote location for troubleshooting if necessary.
“This is the latest in a line of big, tracked crushing plants we’re custom designing for customers; and each one could end up being a one-of-a-kind machine,” said Grasan Vice President Ed Eilenfeld Jr. “However, each custom-built machine could also provide the basis for a similar or even somewhat different machine that could be right for other customers’operations. We can incorporate a variety of types of equipment by various manufacturers to meet our customers’ precise needs and preferences.
“Grasan can do material analysis, product specifications tests and system capacity checks, as well as flow charts to show how the system will work—including all components and their production capacities,” Eilenfeld added. “And we’ll specify equipment, itemize costs, and spell out options to show costs versus benefits.”