At a glance
Conveyor belt maintenance is dominated by belt tracking, idler condition, transfer point management, belt cleaning, and inspection. Most preventable failures are caused by deferred routine maintenance rather than equipment design.
Belt tracking
A belt that runs off-center causes edge wear, structural damage to the conveyor, and spillage. Tracking is influenced by load distribution, idler alignment, pulley alignment, and material build-up on idlers. Self-aligning idlers help but are not a substitute for correctly aligned conveyor structure. Visual inspection and corrective adjustment is a routine maintenance task.
Idler condition
Failed idlers cause belt grooving, generate heat (which can ignite coal dust on the belt), and contribute to spillage. Routine inspection identifies stationary idlers (failed bearings or seized seals), worn shells, and damaged trough sets. Long conveyors increasingly use acoustic or thermal monitoring to detect failing idlers between manual inspections.
Transfer point management
Transfer points are where most belt damage and spillage originate. Maintenance focuses on impact bed or impact roller condition, skirting and sealing, dust suppression performance, and belt cleaner function. Routine cleanup of spilled material under the belt is essential — accumulated spillage can damage return idlers and contact the belt.
Belt cleaning
Belt cleaners need routine tension adjustment and blade replacement. Worn blades stop cleaning; over-tensioned blades wear the belt cover. Replace blades on a schedule that matches observed wear; adjust tension between replacements.
Belt inspection
Visual inspection covers the entire belt length on a defined cycle. Inspectors look for cover damage, edge wear, splice condition, and abnormal patterns. Magnetic and X-ray belt-condition monitoring systems detect internal damage (cord breakage) in steel cord belts before it becomes visible. Splice inspection is particularly important because splices are the most likely failure point.
Belt splice and cover repair
Minor cover damage is repaired with hot vulcanized or cold-bonded patches. Major damage requires belt section replacement. Mechanical fastener splices are quick to install but reduce belt strength; vulcanized splices restore close to full belt strength and are preferred for high-tension applications.
Maintenance scheduling
A condition-based maintenance program tracks the indicators above and schedules interventions before failures occur. Pure reactive maintenance is more expensive over the life of the conveyor because each failure causes secondary damage.