S&B apex shaft classifiers stand for the maximum possible material throughput with very good purity grades. Their key element is an adjustable apex shaft made of stainless steel which allows the separation process to deal with two fractions (2F-SWS) or, correspondingly, with three fractions (3F-SWS) if downstream extraction is used. This converts these air classifiers into true all-rounders that are suitable for a wide range of uses. As for all our air classifiers, we offer a variety of adjustment options to customize every unit to your specific requirements.
Technical specifications
| Input product | Fine, medium and oversize grain (construction site rubble, compost, commercial waste, household waste, mixed plastic wastes) |
| Input product size | ≥ 10 mm |
| Input product quantity | approx. 2-30 t/h |
| Input fraction bulk density | 100-600 kg/m³ |
| Purity | Depending on the input material |
| Air volume required | 15,000–40,000 m³/h |
| Variants 2F-SWS (overall width) |
2F-SWS-1550, 2F-SWS-1750, 2F-SWS-2150, 2F-SWS-2350, 2F-SWS-2550 |
| Variants 3F-SWS (overall width) |
3F-SWS-1550, 3F-SWS-1750, 3F-SWS-2150, 3F-SWS-2350, 3F-SWS-2550 |
| Benefits |
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Data sheet
DownloadTwo-fraction apex shaft classifier
Operating principle of 2F-SWS
At the end of the conveyor belt in the classifier head, a blow nozzle is used to blow the material flow onto an adjustable apex shaft made of stainless steel. The separation into heavy and medium fractions takes place on that shaft. The medium-heavy fraction is carried over the shaft by the latter's rotation and by the blowing force, and then drops onto conveyor belts or into containers or bins.
Heavier parts will fall down even before they reach the shaft, and can be processed further accordingly. The excess air flow is extracted from the expansion chamber, and fed through a cyclone separator or lightweight material separator.
2F-SWS System
Three-fraction apex shaft classifier
Operating principle of 3F-SWS
A feeding belt carries the material into the air classifier where a fan generates an air flow for classification through which the material falls down, separating the material to be classified into heavy, medium-heavy, and lightweight material. Heavy material falls directly down and out of the air classifier, and can be discharged, e.g., via a conveyor belt. Medium-heavy material is blown over the apex shaft, and falls down and out of the classifier only behind this shaft.
The directed air flow inside the classifier also makes certain that the lightweight material will be blown into an extractor located at the roof. The downstream pipeline can be connected either to a light-fraction separator or to a cyclone. Three separate fractions will thus be available after air classification.
3F-SWS system