By L.R. Stace, E.D. Yardley
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Extra resources for Belt Conveying of Minerals
2 gives details of geometrical arrangements of idlers and the clearances needed between idlers in a set and between idlers and supporting structure to minimise damage to the belt. Another type of idler that is said to aid belt control and alignment is the garland or catenary idler, which may come in two, three or five roller sets. 2 Staggered idler set (by courtesy of ATH Resources Ltd). 3 Diagrammatic representation of in-line (top) and staggered (bottom) idler sets. Garland idlers are suspended from the conveyor support framework and have flexible connections between the individual idlers so that the shape of the trough formed can follow, say, an off-centre load caused by large lumps (Fig.
We shall now consider these aspects, together with the design of drives, tensioning mechanisms, materials transfer points and belt cleaning devices. 1 Idler sets In the introduction to Chapter 3 we defined some of the common terms associated with conveyors. In the definition of carrying idlers we said that there were usually three idlers to a set, one centre idler and two wing idlers. We should point out that five-idler sets exist, with a horizontal centre idler and two wing idlers at either side, the outer being inclined at a steeper angle to the horizontal than the inner.
We have seen that although the design calculations can appear relatively straightforward, there are pitfalls that can trap the unwary. We have tried to give references to suitable guides to conveyor design and show the differences in approach that exist. , in belt properties, can take us outside the fields of application of our rules of thumb. In the next chapter we shall consider the hardware that comprises a belt conveyor. 3 References ISO 5048:1989 `Continuous mechanical handling equipment ± Belt conveyors with carrying idlers ± Calculation of operating power and tensile forces'.