There are a number of different designs of idler sets which have been developed
as a result of particular applications, the need to minimise the stress imposed onto
the belt and the environment in which the conveyor operates.
Troughing idlers sets- are found on the carrying-side, along the length of the conveyor.
On any particular conveyor these idlers are identical, as are the bases.
Transition idlers SETS - are found at either end of the conveyor, adjacent to the
head and tail pulleys.
Impact idlers sets - are spaced at intervals of typically 350 mm to 450 mm in order
to provide a comprehensive support base for the belt.
The mass of the return belt is the only load that return idlers are required to support.
As such, return idler sets are spaced at two to three times the pitch of their equivalent
carrying-side idler sets. Return idler sets usually have one or two rolls per idler
set, for similar reasons.