Full definition
Belt conveyors are essential components in material handling systems, designed to transport bulk materials efficiently over varying distances and inclinations. The system consists of an endless belt that runs over a drive drum, typically referred to as the head pulley, and a tail pulley equipped with a take-up mechanism. Supporting structures such as stringers, trusses, or galleries provide stability, while carrying and return idlers facilitate smooth belt movement. Loading and transfer chutes with skirting ensure minimal material spillage during transport, and the drive assembly, which includes a motor, gearbox, and coupling, powers the conveyor system.
These conveyors are particularly noted for their economical operation and high capacity, capable of transporting between 10 to over 40,000 tonnes per hour. They can be tailored for lengths ranging from as short as 1 meter in plant applications to extensive overland setups, such as the Bou Craa phosphate conveyor that stretches an impressive 98 kilometers. The belt speeds generally range from 0.5 to 8 m/s, depending on the application, with inclinations reaching up to 18° for smooth belts and 30-35° for chevron-patterned belts, which enhance material retention on steeper angles.
Designing a belt conveyor requires adherence to established standards, including the CEMA 7th Edition, DIN 22101, or ISO 5048, ensuring safety and operational efficiency. The cost distribution of major components reveals that the belt itself typically accounts for 30-50% of total costs, while the supporting structure contributes 20-30% and the drive assembly 10-15%. Energy efficiency is a critical aspect, with horizontal conveyors consuming about 4-8 kWh per 1000 tonnes per kilometer, which is significantly lower compared to the energy requirements of truck haulage.
Belt conveyors find extensive applications in various industries, including mining, cement production, power generation, ports, aggregate handling, grain transport, steel manufacturing, and food processing, illustrating their versatility in modern industrial operations.