Rock Products

DEC 2018

Rock Products is the aggregates industry's leading source for market analysis and technology solutions, delivering critical content focusing on aggregates-processing equipment; operational efficiencies; management best practices; comprehensive market

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Page 54 of 99 ROCKproducts • December 2018 • 53 EQUIPMENT & TECHNOLOGY SCREENING & SIZING McLanahan Vibratory Screens Able to Withstand Heavier Loading Screening can very easily be viewed as the most important operation in the processing plant. If the screen is only oper- ating at 75 percent efficiency, then 25 percent of the desired product is going somewhere else. The performance of a screen is affected by four variables: eccentric throw, frequency (rpm), angle of adjustment and throw direction. By manipulating these variables, the oper- ator can dial in the screen to match the application and material. McLanahan Vibratory Screens are engineered with ASTM A572 Grade 50 steel side plates. With a tensile strength of 65,300 psi (65 ksi), these side plates have a 45 percent higher yield strength than A-36 steel, which can withstand up to 36,000 psi (36 ksi) of stress before it begins to drasti- cally deform. A fully bolted construction reduces/eliminates cracking due to stress risers in the steel caused by welding. Worn components can be quickly replaced without cutting. McLanahan Vibratory Screens are built with an integrated feed box and are able to withstand heavier loading and larger material in the feed end without worrying about bolts loos- ening or structural failure. McLanahan Vibratory Screens feature robust side plate stiff- ening. Formed plates are bolted to side plates to form a rigid support grid along the length of the side sheet. Independent cross members can be pulled individually and relined in a clean work bay versus on a screen tower, and reduce the need for heavy and wear prone X-bracing. Cross members are on 4-ft. centers to allow more clearance for personnel to access the decks. Replacement cross members come shorter in length and with machined/matched shims to allow for easy installation in areas with limited clearance. Structural tubing gives the producer a variety of size options and allows you to replace only the worn tubes, not the com- plete deck frame. A sacrificial weld plate installed on top of the tubes allows stringers and bucker bars to be welded in without welding directly to the tube. McLanahan Corp., Mobile Classification System Separates Aggregates Without Water Process equipment manufacturer Van Tongeren America, Lebanon, Pa., has unveiled a mobile version of its dry particle classification system that separates materials on-site without requiring water. Developed for processing manufactured sand, frac sand, crushed stone, cement, gravel, lime and other materials, the new, mobile classification system sets the entire processing plant within a standard truck base to permit convenient movement among multiple sites and to make small or remote locations viable where constructing an entire plant would be cost-prohibitive or where water is not readily available. The mobile classifying system integrates the company's pro- prietary Gravitational-Inertial Classifier (GIC) system for particle separation and recovery with its Multicell cyclone system for safely managing exhaust gas at such high particle efficiency that ancillary baghouse dust collectors and precip- itators may be eliminated. The pneumatic air classifier separates particles at any cut point from 300 μm to 63 μm (50 to 230 mesh) and consis- tently runs unattended in 24/7 operation with no moving parts for dependable service and virtually zero maintenance. Van Tongeren America,

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