| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiple shaft screw press capable of improving the efficiency of dehydration of the whole dehydration machine by stabilizing the quantity of filtration water while suppressing the deposition of a sludge layer onto the inner surface of a screen at least on the upper part of a filtration chamber. SOLUTION: The multiple shaft screw press includes: a plurality of screw axes 31, 32 which are arranged substantially in parallel with each other and have different positions in the vertical direction; screw vanes 41, 42 formed on the respective screw shafts 31, 32; a screen 2 which forms the filtration chamber around the screw vanes 41, 42; and scrapers 6 which are disposed on the radial outer side edge of the screw blades 41, 42 while coming in slidable contact with the screen inner surface, wherein an upper screw shaft 31 arranged at least on the upper part of the filtration chamber includes upper screw vanes 41 of multiple rows, and the vanes 411, 412 of each row have respectively a scraper. COPYRIGHT: (C)2011,JPO&INPIT |
