Shaftless inclined screw classifier

Shaftless inclined screw classifier that is waterfilled and designed to transport material from the bottom of the water inlet. During the transport the water will drain off the material.

The screw conveyor is delivered with complete supports and a small walk-way to be used for inspection of the screw conveyor.

What is a screw conveyor classifier?

• A screw classifier is used to sort material out of a water mixture
• Typical materials in a screw classifier are minor minerals in the ore dressing industry
• A screw classifier can also be used to drain water cooled ash or slags from a boiler in a powerplant

See another example of a screw classifier here

Most often a shaftless screw conveyor is used for the material transport, but a conventional screw rotor with ribbon screw flights can also be used. A screw rotor with ribbon screw flights will drain water well and has the advantage that it is self-carried.

Shaftless inclined screw classifier – main highlights

• The bottom of the screw house is supplied with a bended plastic plate to support the shaftless screw
• The screw house is designed water tight since it is filled up to 2/3 of the height – the non water filled part will ensure drainage of the transported material
• Delivered including funnels for transporting material to the screw conveyor

BEMA has made the complete design in cooperation with the client. All components designed and manufactured to decrease the installation time on-site. The shaftless screw conveyor is delivered with a platform to be used for maintenance and supervision of the installed screw conveyor system. All parts are manufactured for easy and fast installation on-site.

FAQ for the Shaftless Inclined Screw Classifier

1. What is the function of a shaftless inclined screw classifier?

A shaftless inclined screw classifier is designed to transport material from the bottom of a water inlet while draining water during the conveying process. The screw housing is water‑filled up to two‑thirds of its height, allowing the upper section to act as a drainage zone for the material.

2. Which materials are typically handled in a screw classifier?

Screw classifiers are commonly used for minor minerals in ore‑dressing processes, as well as for draining water‑cooled ash or slags from power plant boilers. The design supports both mineral separation and water removal in demanding industrial environments.

3. Why is a shaftless screw often preferred in classifier applications?

A shaftless screw is ideal for wet, sticky, or irregular materials because it offers high transport efficiency without risk of material build‑up around a central shaft. In some cases, a ribbon‑flight screw rotor is used instead, offering strong drainage performance and a self‑carrying structure.

4. How does BEMA ensure fast installation and reliable operation?

BEMA designs the complete classifier system in cooperation with the client, delivering pre‑assembled components, integrated funnels, support structures, and a maintenance walkway. All parts are engineered for easy, fast on‑site installation and long‑term operational reliability.