公开(公告)号：US5021159A

公开(公告)日：1991-06-04

申请号：US229673

申请日：1988-08-08

申请人： Terry L. Bliss ,  David E. Chupka ,  Christopher E. McCarthy ,  Larry J. Walters

发明人： Terry L. Bliss ,  David E. Chupka ,  Christopher E. McCarthy ,  Larry J. Walters

IPC分类号： D21F9/04 ,  D21C9/06 ,  D21C9/18 ,  D21F1/78 ,  D21F1/80

CPC分类号： D21F1/80 ,  D21C9/18

摘要： In apparatus for thickening a suspension of pulp material which includes an endless foraminous belt wrapping two spaced horizontally supported rolls, a special doctor mechanism is provided for transferring thickened pulp from the bare surface of the second roll into a trough mounted in the space bounded by the two rolls and the upper and lower runs of the belt. More specifically, the doctor mechanism includes a rigid doctor blade mounted with its working edge in close but spaced relation with the bare surface of the roll to remove pulp therefrom without contact with the roll surface. Provision is also made for periodically oscillating the blade about a horizontal axis to move its working edge away from and back to its closely spaced working relation with the roll.