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THE NEW ENGLAND EDITION
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Vol. XLIX • No. 2
“The Nation’s Best Read Construction Newspaper… Founded in 1957.” Your New England States Connection • Kent Hogeboom 1-800-988-1203
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Conn. Firm Creates First-of Its-Kind Primary Mobile Jaw Crusher To say the Ace LB3860 is a large machine is a bit of an understatement. The LB3860, which weighs in at 275,000 lbs. (124,738 kg), can process more than 1,000 tons (907 t) of material an hour, according to the manufacturer. It can process rock up to 3-ft. (.9 m) in diameter. The first of its kind for this market, this high performance primary mobile jaw crusher is designed for quarries doing high production and for contractors looking to do high-volume work. John Patton of Ace Equipment Sales, Willington, Conn., spearheaded the combination of the Telsmith Jaw and the Eurotrack mobile plant with these users in mind. “In today’s competitive environment, quarry operators and large contractors need high production with a large crusher opening, ease of operation and minimal down-time. The Telsmith jaw’s time-tested use as a stationary primary crusher along with Eurotrack’s experience building track chassis gave us the ability to meet these needs in a stable mobile platform. Contractors need a crushing plant that they can operate with other equipment that is available like a 992 size loader or a 375 to 390 size excavator,” Patton said. “For quarry operators, this mobility gives them the ability to crush shot rock at the quarry face and convey the processed material back to the secondary crushing operation with an overland conveyor saving time, money, fuel, haul trucks and people.” The Telsmith J3858 jaw (38 by 60 in. [96.5 by 152 cm] jaw opening) weighs in at 110,000 lbs. (49,895 kg), is extra deep and wide and is mounted to a Eurotrack X9-2 chassis. The jaw is directly driven by a Cummins QSX15 engine and fed by a 60 in. by 20 ft. (152 cm by 6 m) feeder with 10 ft. (3 m) grizzly-bars and empties onto a 65 in. (165 cm) wide discharge conveyor. The jaws hydraulic relief toggle features overload relief as well as chamber clearing in the event of an unexpected shutdown — eliminating the risk, time and expense of “digging out.”
The crusher has a 17 ft. (5 m) high feed height.
Not Your Typical Crusher In most quarries there is a single massive initial crusher usually known as the primary crusher that makes the first mechanical breaking of the rock. This means that once a section of rock has been blasted, the pieces of rock, typically 3ft. in diameter and smaller, are loaded onto a haul truck and taken to the primary crusher, which then breaks the rock down into smaller pieces. In a large quarry that means that those haul trucks, which must be loaded by a piece of equipment, are expensive to own and consume massive amounts of fuel. The runs also become longer and longer as the quarry face moves farther from the stationary crushing operation. The idea behind the LB3860 is to move a conventional stationary jaw crusher to the rocks that need to be crushed instead of bringing the rocks to the crusher, according to Patton. Conveying rock is the more cost-effective form of transportation and is nearly impossible with shot rock. The cost of just one 60 ton (54 t) haul truck is well above a million dollars and an established quarry would typically need several trucks to maintain production. This machine is built to handle quarry work, not to be confused with the far smaller machines that are used for onsite recycling operations. Dependability and longevity are desirable components of any equipment and the Telsmith J3858 hydraulic jaw has been operating around the world since 1998. Eurotrack did a complete finite element analysis of the see ACE page 13