Pulp screening machine

Claim 1

In a pulp screening apparatus, the combination of a stationary housing having a partition which separates the housing into a pulp screening chamber and a pulp inlet chamber at one end of said screening chamber, said inlet chamber having a removable cover opposite said partition, an impeller rotatably mounted in said housing, an annular screen disposed in the screening chamber and surrounding said impeller, a keeper plate secured to said partition and provided with a central opening which is coaxial with said impeller and communicates said inlet chamber with the interior of the screen in the screening chamber, said keeper plate including a keeper plate sector which is removable from said partition to provide an access passage additional to said central opening, said annular screen consisting of a plurality of segments separably connected together, and means mounting said screen for manual rotation in the screening chamber so that the individual screen segments may be successively brought into alignment with said removable keeper plate sector, whereby upon removal of said cover and of said keeper plate sector and upon separation of the screen segments the segments may be individually and successively removed from the screening chamber through said access passage and through the inlet chamber while leaving the impeller in place.