Suspended Screens
Vibration-isolated Installation
17.02.2010 | Deskman: Wolfgang Geisler
For process related reasons, approximately 20 percent of all screen and discharge chutes have suspended mounts under material bunkers and metering shafts. Rosta’s type AB oscillating mountings are often used for the assembly of such vibration units, as a suspended screening machine can be directly connected to silos and bunkers using isolating suspensions.
Up to now, however, the isolating effect resulting from AB oscillating mountings with suspended vibration units has been less efficient, especially as the suspensions, which have been designed for pressure loads, are considerably stiffer under tensile loads, with widely opened guide arms. The new HS suspensions (hanging screen) have a guide arm geometry that is designed for tensile loads. With ideal loading, the natural frequency of this suspension thereby sinks from its former 5.5 Hz to only approx. 3.5 Hz, which guarantees an isolating effect > 97 percent.
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