Screw conveyor having stopper bar means
AssigneeAmerican Defibrator, Inc.
InventorTure Eric Kollberg
Life of this patent
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Abstract
An improved screw feeder such as may be used for conveying ligno-cellulosic materials such as wood chips, shavings, sawdust and the like to pulping apparatus includes a plurality of stopper bars positioned symmetrically about the inner periphery of the screw feeder throat inlet. The stopper bars are narrow, elongate wedge-shaped and extend from the greater diameter flare bore of the conical throat to the lesser diameter taper bore. The stopper bars prevent material from rotating with the screw rather than advancing longitudinally through the throat and thus decrease plugging and clogging problems so that a higher pulping capacity due to improved feed is obtained.
Claims6
In a screw conveyor for pulp manufacturing equipment, including feed screw means rotationally mounted within a casing defining a chamber for receiving the pulp material, a throat member connected to and extending longitudinally from said casing and having a conical bore tapering from its inlet end at the material receiving chamber towards a discharge end and being provided with a plurality of longitudinal grooves, the feed screw means extending into said bore to gently and progressively compress the material while it is being advanced therethrough by the rotation of the screw means, the improvement which enhances feeding of the pulp material while preventing the same from turning with the feed screw and thereby prevents clogging, said improvement comprising:
- a. a flared peripheral portion (44) at the inlet end of said throat member defining a flare bore (43) merging with the tapered bore of the throat member;
- and
- b. a plurality of elongate stopper bar means having a wedge profile seated in said flare bore (43) adjacent to and overlapping the longitudinal grooves in the throat member.
Dependencies are inferred from the claim text.