Rock Products

JUL 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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ROCK products • July 2018 • 25 SCREENING Superior Industries Superior Industries Inc. expanded its conveyor components accessories line with the release of its new Impact Cradle. The curved design of the Impact Cradle eliminates the space between the belt and bed, adding extra protection. Designed to fit into an existing idler mounting footprint, the Impact Cradle is built to receive the blunt force of material flow at transition points in conveying systems, lessening the wear on the conveyor belt. Without support, conveyor belts are vulnerable to rips, tears and other impact related damage. The Impact Cradle's thick urethane segments absorb shock and dissipate contact energy, reducing conveyor belt wear and tear. Fitted for CEMA C, D and E idlers, the Impact Cradle is available in 20 and 35-degree trough angles for 5-, 6- or 7-in. diameter roll heights. The company also added a new Speed Sensor to its conveyor component accessories offering. The Speed Sensor monitors the speed of a conveyor belt by producing electronic pulses interpreted by a PLC or Superior Speed Sensor module. The unit's sensors help operators con - trol conveyor shutdowns, monitor belt slippage, and trigger warning systems. Fitted for CEMA C and D idlers, Supe- rior Speed Sensors are available for belt widths ranging from 24 to 72 in. and are protected by a two-year components warranty. They can be mounted on a clean side roll, return roll or troughing wing roll. Van der Graaf For the past 30 years, aggregate plants have been adapting the drum motor or motorized pulley to drive their belt conveyors. Although the drive of choice for quarry conveyors has been the external mounted motor and gear box, the drum motor has been gaining pop- ularity due to the all-enclosed design that protects all vital components such as the electric motor, gear reducer and bearings from the environment. Any mechanical equipment that is used in a quarry has to withstand harsh, abra- sive and dusty conditions. Abrasive dust ultimately finds its way into the air ducts of the electric motor, cutting the airflow substantially, which causes the motor to overheat resulting in a complete motor failure. It also penetrates the bearing, seals, couplings and other mechanical conveyor components, creating con- veyor failure, which results in loss of production. The Van der Graaf motorized drum is designed to address all the above points of failure. The extreme duty series drum motor for aggregate use, features an all enclosed design. Bearings, electric motor and all gear reducer components are inside the drive drum (head pulley) working in an oil bath that ensures optimum lubrication and longevity that averages four times the life of a stan- dard external motor/gear box drive arrangement. Since all bearings are housed inside the drum there is no need for mainte- nance, such as re-greasing the bearings, noted the company. The Van der Graaf drum motor features standard class "H" inverter duty motor windings for extreme duty applications, and the VPI (Vacuum Pressure Impregnation) process protects the motor under high vibration conditions. The inline design of the motor and gear reducer results in a 96 percent mechan- ically efficient conveyor drive that saves an average of 30 percent on the electrical consumption. Van der Graaf,

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