Full definition
A specialized idler roller designed to absorb the kinetic energy of material falling onto the conveyor belt at loading points (transfer chutes, hopper outlets). Construction: steel tube with rubber or polyurethane disc rings (typically 50-75 mm OD larger than the core tube) that act as shock absorbers, cushioning the belt and carcass from puncture and impact damage. Ring material: 40-55 Shore A natural rubber or polyurethane. Installed in the loading zone (impact zone) replacing standard carrying idlers, with reduced spacing (300-500 mm between idlers vs 1,000-1,500 mm standard) to provide maximum belt support under falling material. For very heavy impact (large lump sizes, high drop heights), impact cradle/bed systems with continuous rubber bars replace individual idlers, supporting the belt across its full width. Impact energy increases with drop height and lump mass — design per CEMA loading zone guidelines. Per DIN 22112 and CEMA 7th Edition. Brands: Rulmeca, Martin, Superior, Continental.