In both coal-mining and quarrying, belt conveyors are used to convey the coal or rock from one location to another. One type of conveyor used is a continuous belt to which a steel rope is attached at either side. This rope runs on pulleys and provided the motive power for belt itself. When using metal pulleys two problem arise, wear on the pulley and wear on the steel rope. The latter problem may prove to be more important, since repair or replacement involves considerable maintenance time and the rope itself is very expensive. Lining the faces of the pulley with polyurethane has a twofold advancetage. Wear on the rope is significantly reduced with a resultant saving on the rope cost. Breakdown time is also less, and since output rates of up to 1,000 tph. Another factor is that the pulley life is increased and there is a very marked drop in noise level, which is very real advantage in coal mines.
Another application for polyurethane lining is on the pulleys employed in the installation of overhead electrical transmission lines. The aluminium sheated transmission line are atthached to a relatively small diameter steel rope during the installation and the pulley has to be capable of taking the high unit load from the steel rope and yet be soft enough not to damage the alumenium sheathing.
Figure 1 Pulley (Polyurethane lining) http://www.indiamart.com
No comments:
Post a Comment