Pit & Quarry, April 2013
EQUIPMENT FOCUS CONVEYING MATERIAL HANDLING the distance contaminants must travel grease fills that easily trap contaminants and a contact seal that results in less seal drag than other contact type seals As to shell wear Felton says that buyers should be aware that there are many grades of HDPE materials from low quality regrinds and recycled plastic all the way up to ultra high molecular weight UHMW material which is a very dense plastic that is often used in wear pads Our Moxie Roll is comprised of an HDPE material that is close to UHMW but not quite as dense Generally speaking this HDPE material in a half inch thickness is known to resist abrasion and wear to a greater degree than that of the 9 gauge steel used in the same Seal design is the major factor in the wear life of an idler roll CEMA C class of steel idlers says Felton adding that wear life is always dependent upon a number of factors which may include material type load weight and operating speed The proper HDPE roll is a solution to the common problems caused by material buildup and corrosion when using traditional steel return rolls Felton says Due to the lubricity of HDPE the roll sheds sticky material far better than steel which is prone to forming areas of buildup on the return roll that leads to belt misalignment and tracking issues he says As to corrosion if its not steel its not going to rust Felton says Day to day payback I like it when our maintenance team drives past a belt and says Yeah its running just right again today says Stallcop When we replace components we want to replace them with something that is going to last While its merely buzz words to some were looking at total cost of ownership as our guide We want to solve problems not work to mitigate them each day If all our time is spent repairing and replacing were not contributing to the process which is producing quality materials and supplying our customers P Q Carol Wasson is a veteran freelance writer for the aggregates and construction equipment industries www pitandquarry com April 2013 PIT QUARRY 13
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