What does the excavator do in the gravel factory?

Digging, filling and lifting heavy objects, etc. The excavator in the sand and gravel plant is an earth-moving machine that digs materials above or below the bearing surface with a bucket and loads them into transport vehicles or unloads them to the yard. Usually, they dig, fill and lift heavy objects. The gravel factory is to break the pebbles in the river into particles of certain specifications and classify them.