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Before we dive into the case study, a little background information may be necessary. An iron ore pellet is a tiny iron ore ball (between 8 and 18mm of diameter) composed of pellet feed and iron ore fines, which are the finest forms of the iron ore, mixed with a flux (in Brazil usually limestone) and a thickener, which gives the pellets their consistency.

In this article we take a brief look at a locking assembly solution of RINGFEDER POWER TRANSMISSION which was developed for a cement plant after the mill operator had experienced repeated failures of its equipment.

Shrink discs are external locking devices that provide a high capacity interference fit as well as all positive features of a conventional connection method, but which are much easier and faster to assemble and dismount. When a torque is transmitted through the connection of a shaft and a hollow shaft, the contemporary solution is to use a shrink disc instead of a failure-prone keyed connection. Shrink discs are typically available with inner diameters from 14 mm up to 500 mm.