A conveyor feeder is a belt at the bottom of the bin ... A screw feeder is a helical screw at the bottom of the hopper, taking material off to the side. The screw needs a varying pitch, starting ...

Feeders and conveyors are often very different from a design perspective. Feeders are used to control the discharge rate from a storage vessel (i.e, bin, hopper, silo, etc.) and are flood fed.