About this part
Conveyor rollers support the belt and the conveyed material along the carry strand and the empty return strand. Roller types include carry rollers (troughing sets of three or five), return rollers, impact rollers at transfer points, and self-aligning rollers for belt tracking. Roller life is governed by sealing quality (preventing dust ingress into bearings), shell material thickness, and bearing rating relative to load. Roller failures cause belt grooving, fires, and significant downtime, so condition monitoring of running rollers is increasingly common on long conveyors.
Compatible Equipment
Material Options
- Steel shell
- Mild steel tube, suitable for most coal handling conditions. Wall thickness sized to load.
- HDPE shell
- High-density polyethylene shell, used for noise reduction and corrosive environments.
- Rubber-lagged shell
- Rubber lagging on the steel shell, used for impact rollers to reduce belt stress at transfer points.
- Ceramic-faced
- Ceramic facing on contact surface for high-wear applications.
Technical Specifications
| Specification | Value | Unit |
|---|---|---|
| Diameter | 89–219 | mm |
| Roller Length | 300–1,200 | mm |
| Bearing | 6204–6310 deep groove ball | |
| Seal | Labyrinth + contact lip | |
| Shell | 4–8 mm wall steel tube |
Wear Factors
- Seal integrity (dust ingress is the dominant failure mode)
- Bearing load relative to rating
- Shell wall thickness against belt-edge wear
- Operating temperature and lubricant grade
- Carryback build-up causing roller drag
Replacement Notes
Roller replacement is typically driven by inspection: a stationary roller while the belt is running indicates a failed bearing or seized seal. Long conveyors increasingly use acoustic or thermal monitoring to detect failing rollers before they seize, allowing scheduled replacement during planned outages rather than reactive replacement after belt damage.