Aggregates Manager

March 2018

Aggregates Manager Digital Magazine

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34 AGGREGATES MANAGER / March 2018 EQUIPMENT MANAGEMENT the best match of capacity, product size, long life, and reliable operation. Often times, production targets change and improved wear parts become available, yet the plant does not consider a wear part change. Wear component replacement is also the longest maintenance interval, with concave changeouts taking typically anywhere from two to six days. There are two main ways to reduce downtime associated with wear part change outs: 1) reduce the frequency of replacement (make the liners last longer); and 2) reduce the time needed to conduct the replacement. This could be a separate article in itself, but the former is often achieved by a combination of better alloy, thicker mantle/concaves, and better pro- fi le. There are tradeoffs, of course: harder alloys tend to cost more and be more brittle, with increased risk of cracking, while thicker components sometimes just mean higher scrap rate and possibly putting the crusher out of mechanical balance, causing bearing damage and/ or foundation cracking. The second im- provement is reducing downtime needed for wear parts changeouts. There are a multitude of new methods and tooling that have gained popularity today, such as hydraulic shell separation, concave removal bits for rock hammers, concave dump trays, spare mainshafts, pre-fi t concaves, concave jigs/carousels, and the design of the wear parts themselves. The lubrication oil is the life blood of the crusher, as it has a dual role of forming the surface of the bearings, as well as removing heat that is generated while crushing. Maintaining clean oil by proper fi ltration and limiting dust impreg- nation is a must, with regular checks of the oil fi lters and blower system. An oil analysis program — generally recom- mended monthly or every 600 hours of operation — will help determine when oil has reached the end of its usable life. Also, the pumps and lubrication system must be maintained regularly to ensure proper oil fl ow and cooling is achieved, as well as tested periodically for appropriate mechanical safety interlocks. The lower bearing surfaces of most gyratories today are bronze bushings. The bushings need to be inspected periodically for cracking, burns, gouges, or other signs of damage, as these will disrupt oil fi lm buildup, which can cause excessive heat generation leading to burn ups and downtime. The bushings should be measured during scheduled down times to ensure they meet allowable tol- erance as the bushing wears. When the bushings are replaced, it is recommended There are two ways to reduce downtime with wear part replacements: reduce their frequency or time required to do them. March 6-8, 2018 Houston, Texas Come See Us at Booth #2206 Call 866-616-9351 or Visit www.azfab.com Providing Solutions GEORGE R. BROWN CONVENTION CENTER 2018 Building Fines Recovery Equipment Doing What We Do Best High Rate Thickener Dewatering Screen Fractionator Super Cutter Hydro-Cyclone Plate & Frame Press Vertical Durability Cell Made in USA Fines Recovery Equipment

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