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 38 MATERIAL HANDLING & CONVEYING EQUIPMENT & TECHNOLOGY Reduce Noise and Vibration From an engineering standpoint, Fel‐ ton explains why the V‐shaped wing pulley is able to able to operate more smoothly with less vibration and noise, less belt wear, and less of an impact and load on the bearings. He stressed that the Chevron wing pulley has a round end view, which allows continu‐ ous belt contact. The belt is essentially rolling around a circle, which significantly reduces any beating action on the belt. This reduction in vibration is particularly important for tail pulley operation, as too much vibra‐ tion will reduce the effectiveness of skirt‐ board seals. On the other hand, the standard wing pulley is "apexed" or is shaped as a many‐sided polygon. So the belt is al‐ ways raising and lowering over one or two wings as the pulley is going around, which causes the belt to flap and results in more belt wear, and much more vibration and noise. As to the latter, Felton said that it's similar to comparing a jet engine to a vacuum. Tests have shown that the standard wing pulley operates at an average 20‐ noise‐decibel level, while a Chevron wing pulley averages only 70 decibels. "Operations that make safety a top pri‐ ority realize that reducing hazardous vibration and harmful noise levels is an absolute imperative," added Felton. Minimize Downtime Texas Industries Inc. (TXI) is one of the largest suppliers of cement, aggregate and consumer building products in its primary markets of Texas and California. To enhance its market position, TXI man‐ agement stresses a focus on expansion, modernization and production efficiency. TXI replaced its conventional wing pul‐ leys with Chevron wing pulleys at its Bridgeport, Texas, limestone operation and at its Mill Creek, Okla., limestone pro‐ cessing location. "The Chevron pulley is ideal as a tail pul‐ ley in limestone applications. We need a highly durable and heavy‐duty wing pul‐ ley as a tail pulley. Certainly that is where you will typically see the most wear and tear," said TXI Senior Buyer Larry Ennis. "Since we upgraded to these pulleys, we have eliminated a lot of downtime. When rocks get wedged in the traditional wing pulley, it causes major tracking problems – and trying to retrack a belt causes con‐ siderable downtime, and potential dam‐ age to a very expensive belt," he said. Upgrade Multiple System Locations According to Felton, operations are spec‐ ifying the Chevron pulley in multiple sys‐ tem locations that include the tail, gravity take‐up, bend, and snub func‐ tions. "While wing pulleys are tradition‐ ally thought of as tail pulleys only, the round‐end design of the Chevron pulley allows it to be applied in a number of ap‐ plications," said Felton. "CEMA said that a wing pulley should be used in a non‐ drive situation (either as a tail or take‐ up pulley) where there is 180‐degrees of wrap angle. However, since the round surface of the Chevron pulley allows it to operate so much differently that the con‐ ventional wing pulley, we can use it suc‐ cessfully in non‐180‐degree wrap angle applications, such as bends and snubs," he said. Conduct an Audit Take the opportunity to fully examine your material handling systems. Are you maximizing uptime? Are you getting the maximum wear life from costly belts? Are you best allocating your mainte‐ nance manpower? Upgrading key con‐ veyor components throughout the entire material handling system is certainly one of the most cost‐efficient ways to ensure profitability and peak performance. Information courtesy of Superior Industries. While traditional wing pulleys are prone to trap fugitive material, v-shaped Chevron pulleys deflect it out and away. The Chevron pulley is ideal as a tail pulley in limestone applications.

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