Belt conveyors—also known as conveyor belts—are transport machines that utilize friction drive to continuously convey materials. They primarily consist of a frame, a conveyor belt, idlers, pulleys, a tensioning device, and a drive unit. The system employs the conveyor belt as both the traction and load-bearing element; the drive unit propels the belt in a continuous loop, thereby facilitating the steady transport of materials. Belt conveyors are suitable for handling low-abrasiveness materials—such as powders, granules, and small lumps—with a bulk density of less than 1.67 t/m³, as well as bagged goods; examples include coal, crushed stone, sand, cement, fertilizers, and grain.
As one of the primary pieces of equipment for bulk material handling in modern industry, belt conveyors are widely used across sectors such as mining, metallurgy, coal, electric power, ports, chemicals, and construction materials. They feature a simple, reliable operating principle and high conveying capacity, enabling continuous, long-distance, and high-volume transport; they serve as core equipment for linking production stages and facilitating material flow. Capable of both horizontal and inclined transport, these conveyors act as an indispensable "arterial system" within industrial production.
Belt conveyors are primarily composed of the following core components:
(I) Conveyor Belt: Serves as both the load-bearing element and the traction medium for moving materials. The belt loops around the drive pulley and various bend pulleys to form a continuous circuit. Depending on the material characteristics and conveying distance, various types of belts may be selected, such as cotton canvas, nylon, or EP (polyester) belts.
(II) Drive Unit: Includes the electric motor, gearbox, drive pulley, etc. The motor drives the pulley to rotate (via the gearbox), propelling the belt continuously through the friction generated between the drive pulley and the belt. The drive pulley surface may be bare metal or covered with a rubber layer to increase the coefficient of friction.
(III) Idlers: Components that support the conveyor belt and the material load. Types include troughing idlers (carrying section), flat/parallel idlers (return section), self-aligning idlers (for belt tracking/correction), and impact idlers (at loading points). Idlers support the belt to ensure smooth operation.
(IV) Pulleys: Includes drive pulleys and bend pulleys. The drive pulley connects to the drive unit and transmits power. Bend pulleys are used to change the direction of the belt's travel.
(V) Tensioning Device: Applies appropriate tension to the belt to ensure sufficient friction between the belt and the drive pulley. Types include screw, carriage, counterweight, and hydraulic tensioning systems.
(VI) Frame: The structural framework that supports the entire assembly and all components.
(VII) Auxiliary Devices: Includes belt cleaners (to remove material adhering to the belt surface), discharge devices, and safety protection devices such as belt sway switches, speed switches, and pull-cord emergency stop switches.
Belt conveyors have an extremely wide range of applications.
Mining and metallurgy industries: Used for transporting materials such as ore, mineral powder, concentrates, and sintered ore.
Coal and power industries: Used for transporting raw coal, cleaned coal, gangue, fly ash, etc.
Building materials and cement industries: Used for transporting limestone, cement, clinker, sand and gravel aggregates, etc.
Chemical and fertilizer industries: Used for transporting fertilizer raw materials, finished fertilizers, chemical powders, etc.
Ports and terminals: Used for the loading, unloading, and transshipment of bulk cargo.
Grain and agriculture sectors: Used for transporting grain, animal feed, etc.
Organic and compound fertilizer production: Used for the continuous transport of materials between processing stages.
Belt conveyors can transport a wide variety of materials. Bulk materials include coal, crushed stone, sand, cement, chemical fertilizers, grain, cereals, ore, and fly ash; unit loads consist of bagged items weighing less than 100 kg each. Generally, the temperature of the conveyed material should be below 60°C, although specialized heat-resistant belts allow for the transport of materials at higher temperatures.
The working principle of a belt conveyor is as follows: the conveyor belt loops around the drive pulley and various redirection pulleys to form a closed circuit, with appropriate tension applied by a tensioning device. During operation, the drive unit provides power, which is transmitted to the belt via friction between the drive pulley and the belt itself, driving the belt in continuous motion. Material is loaded onto the belt at the feed end and transported to the discharge end for unloading. The equipment must be started under no-load conditions; material should only be fed once normal operation is established. The conveyor is suitable for horizontal transport as well as inclined transport (either upward or downward).
Pre-start Preparation: Adjust the conveyor belt tension and ensure belt fasteners are secure; verify that drive components (bearings, gears, chains, etc.) are in good condition; ensure all idlers and safety guards are in place; confirm proper electrical grounding or neutral connection; and ensure the belt width matches the drum width. Check the area around the conveyor belt for foreign objects.
No-load Start: Start the belt conveyor without a load; feed material only after normal operation is established. Starting the conveyor after material has already been loaded is prohibited.
Operational Monitoring: Ensure uniform feeding during operation to avoid overloading. Monitor the belt for smooth movement and check for any mistracking. When multiple conveyors operate in a series, the shutdown sequence must proceed sequentially from the discharge end back to the feed end (from rear to front).
Shutdown Procedure: Clear all material from the conveyor before stopping; do not shut down until the belt is completely empty. Operation under overload or overspeed conditions is prohibited.
Belt conveyors play a pivotal role in material transfer across various production lines. In organic fertilizer production lines, they link equipment such as crushers, compost turners, granulators, dryers, coolers, screening machines, and packaging scales, ensuring the continuous flow of materials between processing stages. In compound fertilizer production lines, they handle the transport of raw materials for batching as well as the transfer of finished products. In mining operations and coal yards, they are used for the long-distance transport and loading of ore and coal. Belt conveyors serve as fundamental equipment that connects production stages and enables continuous manufacturing operations.
Call us directly, submit a sample or email us!