Screw press with a delivery pipe and method for operating a screw press

Abstract

A screw press features a feed pipe, in which a rotatable feed screw is arranged, and a feed cone, to which the feed screw conveys material, wherein drainage openings are arranged in the feed pipe. Drainage openings are preferably also provided in the feed pipe cone. Especially the combination of a feed screw with a feed pipe cone and a downstream compactor leads to a simple and effective compression of particularly liquid materials.

1 . A screw press ( 1 ,  30 ) with a feed pipe ( 2 ,  31 ), in which a rotatable feed screw ( 3 ) is arranged, and with a feed pipe cone ( 11 ,  38 ), to which the feed screw ( 3 ,  32 ) conveys material, wherein drainage openings ( 39 ,  40 ) are arranged in the feed pipe cone ( 11 ,  38 ) and the feed screw ( 3 ,  32 ) ends at the transition from the feed pipe ( 2 ,  31 ) to the feed pipe cone ( 11 ,  38 ). 
     
     
         2 . The screw press according to  claim 1 , wherein drainage openings ( 17  to  20 ,  33  to  37 ) are arranged in the feed pipe ( 2 ,  31 ). 
     
     
         3 . The screw press according to  claim 1 , wherein the drainage openings in the feed pipe cone are smaller in the region of the cone point than in the region of the cone base. 
     
     
         4 . The screw press according to  claim 1 , wherein more holes per surface area are arranged in the region of the cone point than in the region of the cone base. 
     
     
         5 . The screw press according to  claim 1 , wherein a pressure gauge ( 41 ,  42 ) is arranged in the feed pipe ( 2 ,  31 ) and/or in the feed pipe cone ( 11 ,  38 ). 
     
     
         6 . The screw press according to  claim 1 , wherein a temperature measuring device ( 21 ,  43 ,  44 ) is arranged in the feed pipe ( 2 ,  31 ) and/or in the feed pipe cone ( 11 ,  38 ). 
     
     
         7 . The screw press according to wherein a moisture measuring device ( 45 ,  46 ) is arranged in the feed pipe ( 2 ,  31 ) and/or in the feed pipe cone ( 11 ,  38 ). 
     
     
         8 . The screw press according to  claim 1 , wherein it has a polished and/or chrome-plated inner surface ( 47 ) at least in certain areas. 
     
     
         9 . The screw press according to  claim 1 , wherein the feed pipe ( 2 ,  31 ) features a water inlet ( 48 ). 
     
     
         10 . The screw press according to  claim 1 , wherein the feed screw ( 3 ,  32 ) has a constant diameter over its length. 
     
     
         11 . The screw press according to  claim 1 , wherein a compactor ( 50 ) is arranged downstream of the feed pipe cone ( 11 ,  38 ). 
     
     
         12 . The screw press according to  claim 11 , wherein the compactor ( 50 ) features movable plates ( 51  to  53 ). 
     
     
         13 . The screw press according to  claim 11 , wherein the compactor ( 50 ) features a rotatable compactor screw ( 55 ). 
     
     
         14 . The screw press according to  claim 13 , wherein the compactor screw ( 55 ) conveys material to a compactor cone ( 56 ). 
     
     
         15 . The screw press according to  claim 13 , wherein the feed screw ( 3 ,  32 ) and the compactor screw ( 55 ) are arranged on the same shaft ( 60 ). 
     
     
         16 . The screw press according to  claim 15 , wherein the shaft ( 60 ) is driven by motors ( 61 ,  62 ) on both sides. 
     
     
         17 . The screw press according to  claim 1 , wherein it features an air separator that is arranged downstream of the feed pipe cone ( 11 ,  38 ) referred to the flow direction. 
     
     
         18 . A method for operating a screw press ( 30 ) according to  claim 1 , wherein the shaft ( 60 ) of the screw press ( 30 ) features a motor ( 61 ) on one end and a generator on the other end, and in that the input power of the motor ( 61 ) is reduced by the generator in order to control the shaft speed. 
     
     
         19 . The method according to  claim 18 , wherein the generator is also used as a motor ( 62 ). 
     
     
         20 . The method according to  claim 1 , wherein the pressure, temperature and/or moisture of the material being conveyed is measured on the inner side of the feed pipe ( 2 ,  31 ) and/or the feed pipe cone ( 11 ,  38 ). 
     
     
         21 . The method according to  claim 20 , wherein the measured value is used for controlling a water inlet ( 12 ) for supplying water to the material being conveyed. 
     
     
         22 . The method according to  claim 20 , wherein the measured value is used for controlling the speed of the feed screw or for adjusting a clearance of the feed pipe cone ( 11 ), the compactor cone or movable plates ( 7 ,  34 ). 
     
     
         23 . The method according to  claim 20 , wherein the measured value is used for controlling the position of plates of a compactor. 
     
     
         24 . The method according to  claim 1 , wherein the measured value is used for controlling water drainage from the material being conveyed.