Device for separating and removing separation materials from a flowing liquid

Abstract

The invention relates to a device, especially a step rake with stationary and movable blades whose movement enables separation materials to be separated and removed from a liquid flowing through said rake. The lower ends of the blades are arranged in the region of the base of the channel or the base of a body of water and are temporarily raised above the base when they move. In order to prevent sediments from being deposited between the movable blades, a pre-mounted cover is provided in the direction of flow. A collector chamber is provided for sediments underneath the cover. A cleaning device is arranged in the collector chamber in order to remove sediments.

1 . Device for the separation and removal of separation materials from a flowing liquid, e.g. waste water, in form of a rake immersed in the liquid and consisting of movable and fixed blades, whereby the blades are provided with steps on the side receiving the current and a gap is provided between the blades for the passage of liquid, whereby the movable blades convey the separation materials from step to step of the fixed blades through their movement with at least one movement component in the longitudinal direction of the fixed blades in order to transfer them in the region of the upper ends of the blades to a conveying means for removal, and whereby the lower ends of the blades are located in the region of a channel bottom or of the bottom of a body of water, and with a pre-mounted cover over the region of the lower ends of the blades, characterized in that a collector chamber ( 51 ) for the sediments is provided below the cover ( 5 ) in which a cleaning device ( 6 ) is installed for the removal of the sediments.  
     
     
         2 . Device as in  claim 1 , characterized in that the cleaning device ( 6 ) is provided with a pipe conduit ( 61 ) with at least one nozzle ( 62 ) for the output of a cleaning fluid under pressure or a cleaning gas under pressure.  
     
     
         3 . Device as in  claim 2 , characterized in that at least one nozzle ( 62 ) of the cleaning device ( 6 ) has a nozzle opening for a cleaning jet that directs the cleaning fluid or the cleaning gas at least nearly parallel to the bottom of the collector chamber ( 51 ).  
     
     
         4 . Device as in one or several of the  claims 1  to  3 , characterized in that the cleaning device ( 6 ) is connected to a control device ( 8 ) for the control of the cleaning device ( 6 ).  
     
     
         5 . Device as in one or several of the  claims 1  to  4 , characterized in that the cleaning device ( 6 ) is provided with a connecting pipe ( 63 ) connecting the nozzles ( 62 ) with a fluid or gas under pressure.  
     
     
         6 . Device as in  claim 4  or  5 , characterized in that the control device ( 8 ) controls a pump ( 81 ) provided with an inlet for the cleaning fluid and which is connected to the pipe conduit ( 61 ) on its output side.  
     
     
         7 . Device as in one or several of the  claims 1  to  6 , characterized in that the cleaning device ( 6 ) precedes the blades as seen in the direction of flow (S).  
     
     
         8 . Device as in one or several of the  claims 1  to  7 , characterized in that the cover ( 5 ) is provided with slits ( 52 ) on the side towards the blades ( 2 ,  22 ,  23 ) to carry the movable or fixed blades.  
     
     
         9 . Device as in  claim 1 , characterized in that the slits ( 52 ) of the cover ( 5 ) receive the fixed blades ( 2 ,  22 ,  23 ) at least by one half, as seen in the direction of flow (S) of the liquid.  
     
     
         10 . Device as in one or several of the  claims 1  to  8 , characterized in that the cover ( 5 ) extends until after the fixed or movable blades ( 2 ,  22 ,  23 ) as seen in the direction of flow (S) of the liquid.  
     
     
         11 . Device as in one or several of the  claims 8  to  10 , characterized in that the cover ( 5 ) is provided with slits ( 52 ) constituting a guide for the fixed and/or movable blades ( 2 ,  22 ,  23 ), in particular at a right angle to the direction of flow of the liquid.  
     
     
         12 . Device as in one or several of the  claims 1  to  11 , characterized in that the width of the fixed blades ( 22 ) is widened by a doubling in the region of the slits ( 52 ) of the cover ( 5 ) or under the cover ( 5 ).  
     
     
         13 . Device as in  claim 12 , characterized in that the doubling engages the slit ( 52 ) of the cover ( 5 ).  
     
     
         14 . Device as in one or several of the  claims 1  to  13 , characterized in that the cover ( 5 ) is provided with an elastic sealing lip ( 53 ) on its side towards the blades ( 2 ,  22 ,  23 ).  
     
     
         15 . Device as in  claim 14 , characterized in that the elastic sealing lip ( 53 ) covers the inspection openings ( 53 ) or the region between two doublings ( 26 ) at least partially.  
     
     
         16 . Device as in one or several of the  claims 12  to  15 , characterized in that the doubling ( 26 ) has a vertical length, at a right angle to the direction of flow (S) of the liquid, that is shorter than the distance between two steps ( 24 ) of the blades ( 2 ,  22 ,  23 ).  
     
     
         17 . Devcie as in one or several of the  claims 12  to  16 , characterized in that the doubling ( 26 ) has a length in the direction of the flowing liquid that is equal to the magnitude of the movement component in that direction of the movable blades ( 23 ).