Rock Products

OCT 2014

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 • OCTOBER 2014 36 MATERIAL HANDLING & CONVEYING EQUIPMENT & TECHNOLOGY Peak Pulley Performance In today's competitive environment, operations often face increasingly strin‐ gent productivity demands. Conse‐ quently, it is not uncommon for management teams to conduct periodic "audits" of their processes to ensure peak performance. These audits are typically used to deter‐ mine projected maintenance budgets and goals; and to identify any old or ob‐ solete components which may compro‐ mise plant uptime and reliability. When auditing material handling systems, op‐ erations may wish to examine alterna‐ tives to the use of the conventional wing pulley. While still a typical and traditional choice, the drawbacks of the standard wing pulley are significant especially when compared with the latest inno‐ vations in wing pulley designs. A recent development is the new V‐ shaped wing pulley, which extends pulley life and is engineered to deflect material and prevent belt damage, while minimizing noise and vibration during operation. Prevent Material Buildup, Wing Bending "When operating a traditional wing pulley, the impact of the material feed is directly perpendicular to the wing. Material is more easily entrapped be‐ tween the wings, which over time can cause the wing to bend," said Jarrod Felton, vice‐president of sales, mar‐ keting and engineering for Superior Industries Inc. Several years ago, Superior introduced its Chevron Wing Pulley, a V‐shaped wing pulley design that according to Felton is fast replacing even the heaviest‐duty tra‐ ditional wing pulley. "On the V‐shaped wing pulley, the rock does not hit at a di‐ rect impact but rather at a glancing blow. This deflects fugitive material out and away, and prevents rocks from being wedged between the wings and the belt, lessening the possibility of wing tipping and belt damage," he said. While the spiral wing pulley is also cate‐ gorized as a self‐cleaning pulley, Felton said that its corkscrew shape means that it requires many revolutions of the pulley to auger material from the middle out to the side, versus the material simply glancing or deflecting off the plow shape of the V‐shaped wing pulley. "An impor‐ tant distinction is that the Chevron wing pulley is more affordable than the spiral wing pulley, yet also has an advantage in performance perks," he stressed. Protect the Belt Canadian‐based Stony Valley Contract‐ ing, located in Fort McMurray, Alberta, re‐ placed all 20 of its conventional flat bar wing pulleys with new Chevron Wing Pulleys. Stony Valley Contracting sup‐ plies high‐quality aggregate products to companies within the Athabasca Oil Sands region, one of the fastest growing industrial areas in Canada. The Chevron Pulley (right) has a round end view creating continuous belt contact, which significantly reduces any beating action. The smooth oper- ation creates less vibration, less belt wear, less of an impact and load on the bearings and less noise. A standard wing pulley (left) is "apexed" or is shaped as a many-sided polygon. As a result, the belt is always raising and lowering over one or two wings, which causes the belt to flap and results in more belt wear, and much more vibration and noise. By Carol Wasson

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