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US 4,784,761 AGranted
Drum screen
AssigneeKone-KMW AB
InventorAlf Okvist
Life of this patent
Estimating the term…
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AssigneeKone-KMW AB
InventorAlf Okvist
Estimating the term…
In order to enable thickness screening of the chips in a drum screen comprising a rotatable screen drum with screening slits (1) extending in circumferential direction and formed between a plurality of parallel rings (3) arranged one after the other and joined together at a predetermined distance from each other by means of cross pieces (4) extending axially on the inside of the rings (3), the invention suggests that at least a plurality of the rings (3) of the drum screen is provided with a plurality of guide plates (5) arranged along their inner circumference surfaces, substantially parallel to the screening slits (1) between the rings (3) in order to turn long splinters and chip pieces, enabling them to pass through the screening slits (1) intended for that particular chip thickness. The rings (3), as is known per se, consist of tubes or rods having radius cross section and bent to substantially circular shape. Furthermore the cross pieces (4) are formed as chip lifters extending in the direction towards the center-line of the rings.
A drum screen for screening chips, including long splinters and chip pieces, said drum screen comprising a rotatable screen drum with screening slits extending in circumferential direction and formed between a plurality of parallel rings arranged one after the other and joined together at a predetermined distance fro each other by means of cross pieces which extend axially to the drum screen, characterized in that at least a plurality of the rings of the drum screen are provided with a plurality of guide plates arranged along their inner circumferential surfaces substantially parallel to the screening slits in order to turn long splinters and chip pieces enabling them to pass through the screening slits, the rings consists of tubes or rods bent to a substantially circular shape, and that the cross pieces comprise chip lifters extending in the direction towards the axis of the drum screen.
Dependencies are inferred from the claim text.