They are bunkers whose volumes can vary between 25 and 100 m³, they are used for sand, crushed stone, aggregate bunkering, which allows this material to be loaded or stocked without any contact with the ground.
The feeder bunker truck is filled with a bucket or conveyor belt system and the material can be regularly fed directly to the belt conveyor, screen, or trucks thanks to the vibrating system.
General Makina's vibrating sand feeder bunkers can be operated with a Vibro motor or with a belt-pulley driven eccentric vibration mechanism.