Schrage vs. Screw conveyors

Screw conveyors: A comparison

Screw conveyor

Require little space
More cost-effective for very short distances

Tubular drag chain conveyors

Virtually free of dead zones
Low grain destruction
3D line layouts
Vertical conveyance
Low power consumption
Dust-ignition-proof
Straightforward material changes
No intermediate storage required
Bulk material can be conveyed in two directions at the same time

About screw conveyors

The principle of operation behind screw conveyors uses the Archimedes screw, which enables the conveyors to move material horizontally, vertically, and at an angle. They are somewhat limited to relatively short conveying distances, as the screw conveyor’s design-inherent trough friction means that the power required to drive them is significantly higher than that required for belt conveyors and bucket elevators.

This also means that screw conveyors are ill-suited to conveying sticky, heavily caking, lumpy, or sensitive bulk materials.