Page 5 - Screw Conveyor.ppp
P. 5
Discharge and transport screws
The discharge screws are mounted beneath the floor plate of a container (round silo/rectangular
hopper). Discharge screws and transport screws feed the material to screws with oppositional gradient
to a central outlet. The material is conveyed from the inlet to the discharge head.
It is pushed by the rotating screw within the closed trough.
The fill level of the discharge screw is usually around 95 - 100%.
The fill level of transport screws is lower, usually less than 50%.
The shape and measurements of the trough are tailored to suit the different products to be conveyed.
A rotational speed monitor is fitted to the shaft extension on the opposite side of the drive train. For
lumpy solids (e. g. wood chips) a fill level control can be installed on discharge systems with controlled
discharge in a drop shaft (e. g. light beam, capacitive sensor). The fill level control switches the
discharge system on and off, as required.
A back pressure safety device is also fitted for lumpy solids in the discharge head.
A warning of material blockages is given using an sensor.
