Rock Products

SEP 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 46 of 61 ROCK products • September 2018 • 45 EQUIPMENT & TECHNOLOGY MAINTENANCE & WEAR PARTS Withstanding Extreme Wear in Bulk Material Handling Equipment Bulk material handling equipment for rock, stone, aggregate, gravel and sand can experience extreme wear, whether for mines, quarries, etc. The handling equipment can experience severe wear in con- tact with a variety of coarse materials, particularly in areas where excessive abrasion occurs. In such cases, the bare structure of the equipment may not be adequately wear resistant and even traditional steel or rubber protective liners may insufficiently control the abra- sion. This can pose a risk of costly spillage through holes and gaps, along with production downtime for repair and clean up. For such applications, sheets made from urethane (short for polyurethane) provide far better wear resistance than more traditional options such as rubber or steel (both AR400 and AR450 plate). Urethanes are cost-effective, dependable elas- tomers that combine some of the performance advantages of high-tech metals, ceramics and plastics, along with the resiliency of rubber. Because urethanes also offer significantly less friction than rubber, this not only helps to reduce wear in contact with rough materials like aggregate and sand, but also improves equipment cleanability, which enhances productivity. Now this "tougher than steel" liner can be made even more durable with embedded ceramic tiles. It can also be cut from full sheets of various sizes to fit the contours and shapes of high contact areas, so it can easily be welded or bolted to provide extreme wear protection wherever it is required. While such liners can be cut to fit and installed onsite, custom liners made to fit more complex configurations can increase reliability, simplify installation and further reduce produc- tion downtime. Extreme Wear Resistance The outstanding abrasion resistance of urethane elastomers has led to many important bulk material handling applications. "In plants that handle bulk materials, where severe wear is a problem, special urethane formulations like Kryptane can last several times longer than steel or rubber, which reduces production downtime, replacement cost, and labor for change out," said Jesse Roberge, an industry product specialist at urethane producer Argonics. Kryptane, an extremely wear-resistant material designed by the company for applications where abrasion, sliding or impact occurs regularly, is often used in a wide range of applications including as drum, chute, bin, hopper and conveyor liners. According to Roberge, different applications require different thicknesses of urethane. "For an aggregate batcher or bin/hopper, we recommend a ½- to ¾-in. thick liner, which can last five to 10 years," said Roberge. "In fact, some wear liner manufacturers offer a war- ranty of several years or based on the yardage put through a drum." To most effectively control extreme wear, such as for feed chutes, discharge chutes and turn-heads, Roberge recom- mends the use of liners that actually embed ceramics into the urethane.

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