Method and device for separating or classifying material to be fed
View Patent ↗The device according to the invention for separating or classifying material to be fed into at least two different grain fractions comprises a screen device, which is formed by rotatable elements, particularly a roller table screen, wherein at least one finer grain fraction passes between the rotatable elements and means are provided for cooling the rotatable elements.
1. A plant for the heat treatment of feedstock having a pre-heater ( 200 ) for pre-heating the feedstock and a rotary tubular kiln ( 300 ) for burning the pre-heated feedstock, characterized in that a device ( 100 ) for separating or classifying feedstock ( 1 ) into at least two different grain fractions ( 2 , 3 ) is arranged between the pre-heater ( 200 ) and the rotary tubular kiln ( 300 ), the device having a screen device ( 5 ) which is formed by rotatable elements ( 8 ), at least one finer grain fraction ( 2 ) falling through between the rotatable elements and means ( 14 ) being provided for supplying a cooling medium to the rotatable elements ( 8 ),
and wherein the rotatable elements ( 8 ) have a basic body ( 8 a ) and an outer casing ( 8 b ), the basic body ( 8 a ) having a duct ( 8 d ) which extends in the direction of its axis of rotation ( 8 e ) and which can be acted upon by a cooling medium and which is connected to the means ( 14 ) for supplying the cooling medium.
2. The plant according to claim 1 , wherein the screen device is in the form of a roller table screen and the rotatable elements ( 8 ) are in the form of rollers or cylinders.
3. The plant according to claim 1 , wherein at least some of the rotatable elements ( 8 ) are connected to a drive.
4. The plant according to claim 1 , wherein the distance between at least some of the rotatable elements ( 8 ) is adjustable.
5. The plant according to claim 1 , wherein the rotatable elements ( 8 ) are provided inside a housing ( 13 ) and the rotatable elements ( 8 ) are supported in bearings ( 10 , 11 ) which are arranged outside the housing.
6. The plant according to claim 5 , wherein the bearings ( 10 , 11 ) have means for cooling.
7. The plant according to claim 1 , wherein the outer casing ( 8 b ) of the rotatable elements ( 8 ) is wear-resistant and/or temperature-resistant.
8. The plant according to claim 1 , wherein material guide elements ( 15 ) are provided between two adjacent rotatable elements ( 8 ).
9. The plant according to claim 1 , wherein there are provided between two adjacent rotatable elements ( 8 ), means ( 16 ) for cleaning the nip between the two rotatable elements.
10. The plant according to claim 1 , wherein the rotatable elements ( 8 ) have a non-circular shape but a substantially constant nip remains between two adjacent rotatable elements during the rotational movement.