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RHEWUM GmbH | 42875 Remscheid | Tel. +49 (0) 2191 - 5767 - 0 | info@rhewum.de
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Screening Machines with direct excitation of screen cloths » WAU
WAU, three decks and feeder
Screening machines of type WAU are used in the medium separation range.
This screen type is a throw sieve which employs direct excitation of screen mesh; thus the screen housing only takes a statical function. It also preserves the building and/or the steel structure. No dynamic loads are transmitted as they are created by completely vibrating convential screens and rigid connection to on-and off-going chutework is possible.
Vibration is imparted into the screen cloth by high speed movement of a transversally mounted rocker shaft, located beneath the screen cloth. Therefore the velocity down the screen is determined by the angle of the screen deck. Outside the screen housing rugged out of balance motor drives rock the knocker shafts, conveying the high frequent oscillation directly into the screen mesh. These motor drives create easily high accelerations on the screening net which are up to 10 g. These high accelerations guarantee also a correct screening of adhesive products. During standstill the vibration intensity of the motors can be adjusted and therefore a perfect adaption of vibration amplitude to product changements is possible. Each screen deck can be individually adjusted and perfectly adapted to product demand.
The high frequency vibration of the screen net effects to overcome the adhesive particle forces within the product, to loosen the product bed and to segregate the product mixture of coarse and fine material and ensures its separation. The machines attain unequal high specific screening capacities on the smallest possible space.
The combination of longitudinal tensioning of screen nets and free access affords easy and quick exchange of screen cloths. Maintenance of the outside the screening space arranged drives can be done during operation and due to the number of drives a possible failure of a drive does not necessitate to shut down the plant.
Standard machine sizes are in the range of 1.4 m² to 26.4 m² per screening deck resp. machine. Additional sizes and special constructions are possible on demand. Relating to these dimensions electrical power range is in between 0.52 kW to 3.9 kW(!)
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