The Grasan KRHT-60E tracked 3,000-tph horizontal impactor plant utilizes a New Holland type Williams 3-blow-bar impact crusher with Williams 6- x 50-ft. apron feeder and Simplicity 7- x 20-ft. grizzly bar scalping screen that can handle material up to 60-in. lump size. The plant measures 47-ft. high, 39-ft. wide, 122-ft. long (183-ft. with discharge conveyor) and weighs 1.2 million lbs. The 120-ton hopper is 24-ft. wide, 29-ft. long, and 9½-ft. 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. 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 1,000-lb. blow bars. Two 500-hp electric motors supply power for the 3,000-tph impactor. The 60-in. x 75-ft. discharge conveyor is powered by twin 100-hp electric motors.
“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.”