Grasan has a new, custom designed, tracked 3,000-tons-per-hour (2,721 t) horizontal impactor plant for aggregate crushing operations. Designated the KRHT-60E, the plant utilizes a New Holland type Williams 3-blow-bar impact crusher with Williams 6 by 50 ft. (1.8 by 15 m) apron feeder and Simplicity 7 by 20 ft. (2 by 6 m) grizzly bar scalping screen that can handle material up to 60 in. (152 cm) lump size.

The new plant measures 47 ft. (14 m) high, 39 ft. (11.9 m) wide, 122 ft., (37 m) long (183 ft. [55.7 m] with discharge conveyor) and weighs 1.2 million lb. (5.4 million kg). The 120-ton (109 t) hopper is 24 ft. (7.3 m) wide, 29 ft. (8.8 m) long, and 9.5 ft. (3 m) 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 in. (101 cm) wide smooth pads and self-leveling stabilizer legs. The twin-track unit is powered by two 300-hp (223 kW) electric motors, travels at .5 mph (.8 kmh), 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 1,000-lb. blow bars. Two 500-hp (373 kW) electric motors supply power for the 3,000-tph impactor. The 60 in. by 75 ft. (152 cm by 23 m) discharge conveyor is powered by twin 100-hp (74.5 kW) 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: 4,161-volt for motors 200 hp (149 kW) and over; 480-volt for all others. The plant has the same kind of sophisticated filtering and sensing system as an aircraft, according to the manufacturer. 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.”

For more information, call 419/526-4440 or visit www.grasan.com.

This story also appears on Aggregate Equipment Guide.

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