Pulleys
Drum pulleys are critical components of belt conveyor systems, which are widely used in power plants—especially thermal power plants—to handle bulk materials like coal, lignite, limestone, and ash.
This system typically includes components like fuel level sensors, fuel pumps, control panels, and monitoring software, enabling features like automatic fuel filling, remote monitoring, and theft prevention.
- What Is a Drum Pulley?
- A drum pulley is a cylindrical pulley installed at the head, tail, or bend of a conveyor belt. It provides belt support, tension, and direction change, and in some cases drives the belt.
- Role of Drum Pulleys in Power Plants
In power plants, drum pulleys are mainly used in:
- Flat Return Idlers
- V-Return Idlers
- Training Idlers (Return Type)
- Rubber Disc Return Idlers
- Spiral Return Idlers
- Driving the conveyor belt
- Redirecting belt travel
- Maintaining proper belt tension
- Supporting heavy bulk material loads
Their main functions include:
-
Types of Drum Pulleys Used
Head (Drive) Pulley
- Located at the discharge end
- Connected to the motor and gearbox
- Usually rubber-lagged to increase friction
- Transmits power to the belt
- Located at the loading end
- Helps maintain belt tension and belt alignment
- Typically plain (non-lagged)
- Used to change belt direction
- Improves wrap angle on the drive pulley
- Maintains constant belt tension
- Often part of gravity or screw take-up systems
Tail Pulley
Tail Pulley
Take-up Pulley
Construction Features
Shell
Fabricated steel or cast steel
Shaft
High-strength alloy steel
Bearings
Heavy-duty spherical roller bearings
Lagging
- Rubber lagging (plain or diamond groove)
- Ceramic lagging for high-moisture coal
Sealing
Labyrinth seals to protect bearings from coal dust and ash
Design Considerations in Power Plants
High belt tensions due to long conveyors
Abrasive materials (coal and ash)
Wet and dusty environments
Continuous operation (24/7)
Fire resistance and anti-static belt compatibility
-
Common Problems and Maintenance
Problems:
- Belt slippage
- Shell wear or corrosion
- Bearing overheating
- Shaft deflection or failure
- Regular bearing lubrication
- Lagging condition inspection
- Alignment checks
- Vibration and temperature monitoring
Maintenance Practices:
Importance in Power Plant Reliability
Failure of a drum pulley can:
Stop coal supply to the boiler
Cause unit deration or shutdown
Lead to costly downtime and safety risks
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