Drum Pulley Assembly

We are manufacturing conveyor drum pulley assembly as per the drawing specification by customer requirements.

Drum pulleys are critical components in conveyor systems, and their technical specifications are essential for proper selection and performance. These specifications define the pulley’s physical characteristics, material composition, and performance ratings to ensure it can handle the required load, speed, and environmental conditions.

Key Technical Specifications

• Pulley Diameter and Face Width: The pulley diameter (or drum diameter) is the outside diameter of the cylindrical shell, and the face width (or face length) is the length of the cylindrical body. These dimensions are directly related to the conveyor belt width and are crucial for proper belt tracking and support. Pulley diameters can range from 2″ to 60″ or more, and face widths are typically slightly larger than the belt width.
• Shaft Diameter and Material: The shaft diameter must be sized to handle the combined bending and torsion moments from the belt tension and driving forces. Common shaft materials include steel grades like EN3A or EN9, which are chosen for their tensile strength and durability. The shaft can be a dead shaft (stationary) or a live shaft (rotating with the pulley).
• Shell Thickness and Material: The shell is the main body of the pulley. Its thickness must be sufficient to withstand the stresses from the belt tension and material load. Shell materials are typically steel, often made from heavy-wall tubing or pipe, and the thickness can range from 1/4″ to 3/8″ or more, depending on the application’s duty rating.
• Lagging: Lagging is a coating applied to the pulley’s surface, most commonly a vulcanized rubber or ceramic material. It increases the friction between the pulley and the belt, which improves traction and reduces belt slippage. It also protects the pulley shell from wear and corrosion. Lagging can be smooth, grooved (like herringbone or diamond patterns), or ceramic-tiled.
• Duty Rating: Pulley duty ratings, often classified by standards from organizations like the Conveyor Equipment Manufacturers Association (CEMA), indicate the pulley’s capacity for different applications. Common classes include:
  • Heavy Duty: For belts rated up to 750 pounds per inch of width (PIW), with infrequent starts and stops.
  • Mine Duty: For more demanding applications with frequent starts and stops.
  • Engineered Class: Custom-designed for critical, high-stress applications, often with steel cable belts.

Types and Applications

• Drive Pulley (Head Pulley): Located at the discharge end of the conveyor, this pulley is powered by a motor and drives the belt. It’s usually the largest pulley and is often lagged to maximize traction.
• Tail Pulley: Located at the loading end, this unpowered pulley redirects the belt and helps maintain proper belt tension and alignment.
• Snub Pulley: A small pulley used to increase the wrap angle of the belt around the drive pulley, thereby increasing the contact area and improving traction.
• Take-Up Pulley: An adjustable pulley that removes slack from the conveyor belt to maintain proper tension.
• Wing Pulley: Unlike a continuous drum pulley, a wing pulley has a series of “wings” that allow loose material to fall through. This design makes it “self-cleaning,” which is ideal for applications where material buildup is a problem.
• Spiral Drum Pulley: A variant of the drum pulley with a pair of steel bars wound spirally around the drum. These pulleys offer a continuous cleaning action by reducing material buildup while maintaining constant belt contact.