Pulleys
Pulleys are the main elements providing the transmission of torque from the drive and ensuring that belts remain taught. They have different functions in conveyors depending on their position in the conveyor layout (drive/head, return/tail, tension, snubbing, redirection).
Pulleys TRANZA have three basic design styles depending on operating conditions and their function in the conveyor system.
Drum style pulleys
Can be used at any location. It consists of a rim shell, 2 end discs and 2 shaft locking assemblies.
Wing style pulleys
Can be used as a tail pulley and on gravity take-up assemblies. Helps prevent material build up and belt damage from transported materials. It consists of face bars, fins, gussets and locking assemblies.
Squirrel cage style pulleys
Can be used in the same positions as wing pulleys for particular applications where very wet materials are conveyed and where the inner surface of the belt gets very dirty.
Pulleys Design
The following parameters are required for designing a pulley:
- Width of conveyor belt
- Quality of conveyor belt
- Conveyed amount of material (type of material)
- Conveying speed
- Length of conveyor and degree of incline
- Type of drive station (single pulley x two-pulley)
- Number of drive units
- Power of drive units, weight
- Bearings of drive units – coupling with pulley
- Start up – starting drive units
- Means of clamping the belt
- Pulley diameter, bearing pitch, required service life of bearings
- Working environment
- Type of pulley, location along conveyor belt
The pulleys are standardised and design according to ISO 1536.