Perhaps you simply mean 'trummels' in English.

HTH

Sheila

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... systems (stationary & permanent), brakes, AVL systems TRUCK/EQUIPMENT WASHING WASTE-TO-ENERGY
PROCESSING EQUIPMENT - air classifiers, trummels, boilers/boiler ...
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... t: 02 9980 1759. Regions: nsw vic qld sa tas wa nt act nz TOP, Zillmere Engineering
Bar screens, trummels, grading screens. Bark, stainless-steel. ...
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t: 07 3888 2133. Regions: nsw vic qld sa tas wa nt act se asia nz TOP, ...
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Note added at 2003-02-17 12:52:47 (GMT)
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trummel or trommel is a sieve for screening or sizing rocks:

trommel
 
SYLLABICATION: trom·mel
PRONUNCIATION:   trml
NOUN: A revolving cylindrical sieve used for screening or sizing rock and ore.
ETYMOLOGY: German, from Middle High German trummel, diminutive of trumme, drum, probably of imitative origin.

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Note added at 2003-02-17 12:54:46 (GMT)
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Trommel
www.wissen.de
Wahrig - Deutsches Wörterbuch: \'Trom·mel <f. 21; Mus.> Schlaginstrument mit zylindrischen, an beiden Seiten mit Kalbfell bespanntem Resonanzkörper; walzenförmiger Teil einer Maschine od. eines Gerätes (Revolvertrommel, Siebtrommel); walzenförmiger Behälter (Brottrommel, Botanisiertrommel); die Trommel rühren, schlagen; die Trommel für etwas rühren <fig.> für etwas werben, Propaganda machen; kleine, große Trommel <Mus.> [<spätmhd. trum(b)el <mhd. trum(b)e „Trommel, Trompete, Posaune“; zu trum(m)e „Schlaginstrument“ <ahd. trumba (lautmalend)]
 

 
http://www.bartleby.com/61/64/T0376400.html
Trommel NOUN A revolving cylindrical sieve used for screening or sizing rock and ore. ETYMOLOGY German, from Middle High German trummel, diminutive of trumme, drum, probably of imitative origin.


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