There are two types of belt weighfeeders: those with a controlled belt speed and those with a metering hopper.
Belt weighfeeder with controlled belt speed:
Belt weighfeeders with controlled belt speed are belt-assisted feeders whose belt speed is adapted so it attains the nominal delivery rate.
Since the same amount of material is not always transported on the conveyor belt, the belt speed must be varied to achieve a constant feed rate per unit of time. The weight of the material transported is determined by weighing the belt load and measuring the belt speed.
Depending on design, belt weighfeeders have delivery rates ranging from several kilograms to several hundred tons an hour.
Belt weighfeeder with metering hopper:
Belt weighfeeders with metering hoppers have a controlled feeder which adjusts the amount of material on the belt.
These metering hoppers, which may be chutes, augers, radial vane rotors or conveyor belts, feed precisely the right amount of material to the conveyor belt.
Belt weighfeeders are suited to bulk materials which flow easily and don’t stick to the belt and can handle very large mass flows.