Patent ID: 6042726
Filing Date: 2000-03-28
Classification: B01D,B23Q

Abstract:
A filtration apparatus comprising:a tank for receiving a liquid containing impurities to be filtered;said tank having two upstanding side walls, and a bottom wall;an endless annular support wall projecting from each side wall of said tank above the tank bottom wall;an endless filtration belt spanning the space between said support walls, said filtration belt having marginal side edges thereof telescoped onto said support walls, whereby said endless support walls seal against liquid flow around the belt side edge;said annular support walls and said endless filtration belt cooperatively forming a liquid outlet chamber;means for drawing filtered liquid out of said outlet chamber, whereby solid impurities collect on the belt surface and on the tank bottom wall;means for moving said belt in an orbital motion along said support walls;means for removing solid impurities that collect on the belt surface;a drag conveyor for removing solid impurities from the tank bottom wall;said belt moving means comprising a first set of endless drive chains forming a first pair of chain loops extending along the marginal side edges of said belt, a first set of rotary sprockets (66, 66) meshed with said first set of endless chains, outside of the first pair of chain loops and a first drive shaft connecting the sprockets in said first set;means for moving said drag conveyor, comprising a second set of endless drive chains forming a second pair of chain loops, a second set of rotary sprockets (72, 72) meshed with said second set of endless chains, outside the second pair of chain loops and a second drive shaft connecting the sprockets in said second set; anda single power means having drive connections with said first and second drive shafts, whereby said filtration belt and said drag conveyor are both moved by said single power means.