Conveyor Systems Flashcards

What factors determine the maximum incline angle for a belt conveyor?

Answer: Material characteristics (angle of repose, moisture, lump size), belt surface texture, and loading method

Maximum conveyor incline depends on the material's angle of repose (how steeply it can be piled), moisture content (wet material may slide), lump size and shape, belt surface texture (smooth vs. cleated/chevron), and how the material is loaded (centered vs. off-center).

What is the function of a head pulley lagging?

Answer: To increase the friction coefficient between the belt and pulley by applying a rubber or ceramic surface to the pulley shell

Pulley lagging is a rubber, ceramic, or urethane coating applied to the pulley shell surface to increase the coefficient of friction between the belt and the pulley. This improves drive traction, reduces belt slip, and sheds water that would otherwise reduce grip.

What is the difference between a mechanical belt splice and a vulcanized belt splice?

Answer: Mechanical splices use metal fasteners for quick field installation but are weaker, while vulcanized splices bond the belt layers with heat and pressure for a stronger, smoother joint

Mechanical splices use metal hinges or plate fasteners bolted or riveted through the belt ends — they are quick to install in the field but achieve only 40-70% of belt strength. Vulcanized splices chemically bond the belt plies with heat and pressure, achieving 90-100% of original belt strength.

What is the purpose of a snub pulley on a belt conveyor?

Answer: To increase the belt's wrap angle around the drive pulley, improving belt-to-pulley friction and traction

A snub pulley is positioned near the drive pulley to increase the arc of contact (wrap angle) between the belt and the drive pulley. A greater wrap angle increases the friction force available to drive the belt, allowing lower belt tension for the same driving force.

What is a conveyor belt condition monitoring system?

Answer: An integrated system using sensors to continuously monitor belt condition including thickness, splice integrity, rips, and edge wear for predictive maintenance

Belt condition monitoring systems use various sensor technologies (electromagnetic, ultrasonic, visual) to continuously assess belt health parameters including cover thickness, cord condition, splice integrity, longitudinal rips, and edge damage, enabling predictive maintenance and preventing catastrophic failures.

What is the correct procedure for tensioning a screw conveyor that has stopped due to material jamming?

Answer: Lock out the drive, remove the access covers, clear the jammed material manually, check for damage, and restart empty before resuming operation

A jammed screw conveyor must be locked out/tagged out first. Access covers are removed to manually clear the jammed material, inspect the screw flights, trough, and bearings for damage, then the conveyor is restarted empty and gradually brought back to normal loading.