A) Carrying Idlers
Carrying idlers is used at the loading points where the lump size and the weight of the material seriously damage the belt if the belt were rigidly supported.
The return idlers which carry the weight of the empty belt in the return side or the lower side of the conveyor are mostly single roller straight idler.
The spacing of idlers on the loaded run of the conveyor, carrying bulk material, depends on the belt width, the specific weight of the bulk material, the type of the idler. The spacing of the idlers in the loading zone of the belt is about half the normal spacing of idlers in the carrying side.
Impact rollers are used as carrying rollers instead of normal steel rollers at a loading point. On steel roller there are rubber rings assembled, side by side, to absorb the weight and impact of material falling onto the belt. At the same time impact rollers reduce the shock and vibration through the steel structure.