Rotary tub grinder

Solid material comminution or disintegration – Apparatus – Rotary striking member with feed or discharge conveyor or...

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Details

2411017, 2411864, 241189R, 241240, B02C 1306, B02C 13286

Patent

active

041067061

ABSTRACT:
A rotary tub grinder in which a substantially cylindrical tub member is rotated relative to a stationary floor member. Material in the tub grinder is moved over the upper surface of the floor member and a portion of it is moved up a ramp into the path of a rotating hammermill. A stabilizer member is positioned on the floor member across the opening from the ramp member and serves to steady the material so that the hammers of the hammermill can uniformly feed material downwardly into the grinder. The stabilizer member extends higher above the floor member than the ramp member and the path of the rotating hammers extends higher above the floor member than the stabilizer member. A layer of material is planed off as it moves about the tub grinder. The ramp member and stabilizer member also serve to help prevent material from falling into and clogging the grinder when the tub grinder is shut down or slowed down by a power governor. The grinder of the present invention includes a plurality of shear plates that are mounted to a wall of a casing that surrounds the rotating hammers. The shear plates are adjustable toward and away from the path of the rotating hammers so that the size of the grind can be adjusted. In one embodiment, the shear plates are mounted on a support member which is adjustable relative to the wall member of the casing and to the axis of rotation of the hammers. The invention further includes a flap valve arrangement for selectively controlling the amount of air that is discharged with the material that leaves the casing through the material outlet. Several embodiments of the stabilizing means are disclosed including a hood-shaped stabilizing member, a stabilizer means composed of a plurality of strips, and a stabilizing means in which the stabilizer member has a shape substantially the same as the ramp member so that the tub grinder could be efficiently run with the tub member rotating in either direction about its axis.

REFERENCES:
patent: 1355093 (1920-10-01), Herche
patent: 1420021 (1922-06-01), Davidson
patent: 2216612 (1940-10-01), Dimm et al.
patent: 3490705 (1970-01-01), Ruckstuhl
patent: 3966128 (1976-06-01), Anderson et al.
patent: 4003502 (1977-01-01), Barcell
patent: 4033515 (1977-07-01), Barcell et al.
patent: 4066216 (1978-01-01), Waldrop et al.

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