Belt Conveyor Pulley Part

Here is a clear and complete overview of belt conveyor pulley parts, useful for engineering, procurement, and maintenance understanding. A belt conveyor pulley is a key mechanical component that drives, redirects, or tensions the conveyor belt. Each pulley is an assembly of several engineered parts:

1. Pulley Shell (Drum)

• The cylindrical body of the pulley.
• Made from steel plate rolled and welded.
• Supports belt contact and transmits traction.
• Thickness depends on pulley load and diameter.

2. Pulley Shaft

• A solid or hollow steel bar running through the pulley.
• Transmits torque from the drive unit to the pulley shell.
• Designed for bending and torsional loads.
• Typically made from C45, 1045, or 4140 steel.

3. End Discs (End Plates)

• Circular plates welded to both ends of the shell.
• Connect the shell to the pulley hub.
• Carry load from the shell to the hub.
• Can be flat or cone-shaped depending on design.

4. Hubs

• Components welded or fitted onto the end discs.
• Receive the locking element or bush.
• Provides a detachable connection between shaft and pulley.

5. Pulley Bearings

• Mounted on both ends of the shaft.
• Allow smooth rotational movement.
• Usually heavy-duty spherical roller bearings.
• Housed in bearing housings (plummer blocks).

6. Bearing Housing

• Holds the bearings and supports the pulley on the conveyor structure.
• Includes seals, lubrication points, and mounting bolts.

7. Locking Elements / Bushings

• Connect the shaft and pulley securely.
• Types: Taper lock, keyless locking assembly, QD bushing.
• Allow easy removal and replacement of pulleys.

8. Pulley Lagging

Applied on the outer surface of the pulley shell to improve friction and protect against wear.

Types:

• Rubber Lagging (diamond, herringbone, chevron)
• Ceramic Lagging (tiles with rubber matrix)
• Polyurethane Lagging
• Cold-bonded or hot-vulcanized

Functions:

• Increase traction (reduces belt slippage)
• Increase pulley life
• Improve water/drainage performance

9. Shaft Keys / Keyways

• Mechanical locking feature between shaft and bushing (if required).
• Prevents rotational slippage.

10. Pulley Guard (Optional)

• Safety cover installed around exposed pulleys.
• Prevents personnel from getting caught in moving parts.

11. Seals

• Located in the bearing housing.
• Prevent dust, water, and contaminants from entering the bearings.

Pulley Types

• Drive Pulley — powered by motor/gearbox.
• Tail Pulley — located at the return side.
• Snub Pulley — increases belt wrap angle.
• Bend Pulley — redirects belt.
• Take-up Pulley — provides belt tension.

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• Belt Conveyor Pulley Lagging Procedure
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