Troughing or carrying idlers:
Troughed belts carry for greater tonnages than flat belts, for the same width of the belt and belt speed. Troughing idlers are therefore very important components of belt conveyors.
The inclination of the end rolls of three-roll troughing idlers ranges from 20° to 45°.
Return Idlers:
Return idlers are to support the return stand of the belt.
Generally flat.
Impact idlers:
Impact type troughing idlers, having rolls made of resilient material, are used at loading points i.e., Transfer Points where lump size and height of the material handled could seriously damage the belt, if the belt were rigidly supported.
Self aligning idlers:
For a number of reasons, conveyor belts fend to become distorted transversely, on the idlers. Therefore, belt training idlers frequently are used to train or align the belt to a central position. Unlike normal idler sets, the self aligning idlers are fitted with a pivot at the center which will below the same to swivel freely about the central vertical axis. If the belt deviates it will make contact with the small vertically mounted rolls at the end of each inclined idler. This causes the idler set to swivel in the belt running direction to bring back the belt to the centre.
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