Inclined Screw Conveyor

Inclined screw conveyors generally operate with a certain slope degree until 45 degrees. Greater values of inclination are considered as a vertical screw conveyor.

As the slope degree increases, efficiency decreases because of gravity effects, therefore motor’s power needs to be increased as well, also, efficiency is affected by the type of trough and screw pitch. Our experts recommend working with the less slope possible to get a maximum efficiency.

Design and manufacture considerations for an inclined screw conveyor:

Inclination from 10 degrees: There is a minimum loss of efficiency. A trough “U” type and a standard pitch are enough for this application. The minimal loss can be overcome increasing the rpm and outer diameter or reducing screw pitch.
Inclination from 10 to 20 degrees: Efficiency losses range increases from 10 to 40 %. Also, they can be overcome increasing rpm and outer diameter. It is required additional power to compensate gravity factor.
Inclination from 20 to 30 degrees: Efficiency losses range increases from 10 to 70%. It is recommended to use a tubular trough and a reduced-pitch (1/2 or 2/3) for this application.
Inclination from 30 to 45 degrees: Efficiency losses range increases from 30 to 90%. It is recommended to use a tubular trough and a reduced pitch (1/2 or 2/3) and a bigger outer diameter. It is required more speed (rpm) and power to compensate gravity factor.