Compact centrifuge scraper movement - has single hydraulic movement for radial and axial motions

摘要

In sedimentation centrifuges, space requirements and cost of conventional scraper movement is separate hydraulics for radial and axial motions for removal of solids from rotors is overcome by a compact single cylinder unit, carrying out both motions independently. Flange mounted housing contains, co-axially arranged and seen from top section with single press. cylinder with hydraulic feed, throttled for radial-, and bypassing throttle for axial motion, surrounded by hollow scraper shaft, ending in scraper/cutter blade outside housing. Piston in press. cylinder moves rod with oilway bore to operate threated radial motion gear below press. cylinder section. Any friction created axial motion in this section is compensated in the third section, where the piston rod carrying a second piston produces an opposing force in the cylinder formed within the lowre part of the scraper shaft with oil at appropriate press. entering via the rod oilway. Radial motion movement has threaded sleeve, secured against rotating, and actuated by the piston rod. Sleeve engages counter thread in scraper shaft, so forcing it to turn and swing out the scraper/cutter. Scraper shaft cylinder end, acting, as stop for piston rod. limits this motion. Increased oil press. through throttle bypass effects axial motion with all parts moving w.r.T. press. cylinder. End switch actuating multi-way valve, changes over hydraulic oil flow to reverse motions, until die position is attained again.