Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Separating means
Patent
1986-04-24
1987-11-03
Reese, Randolph A.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Separating means
209279, B07B 115
Patent
active
047038608
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
This invention is directed to disk screens of the kind exemplified in U.S. Pat. 4,377,474, wherein the screening bed is defined by rotary screen disk shafts extending in spaced parallel relation from an intake end to a discharge end of the bed, and especially suitable for screening particulate material such as wood chips intended for use in producing paper pulp.
As disclosed in that patent, the parallel shaft assemblies carry screen disks which are interdigitated with the disks of adjacent shaft assemblies in a substantially uniform interface screening opening space or slot relation.
In wood chip screening with the just-described disk screen, a problem has been encountered in that as the chips progress down the length of the screening bed, the volume decreases in proportion to the length of the bed. As the volume decreases, the chips that are nominally larger than the interface openings have a progressively greater likelihood of finding their way through the screen slots due to inaccuracies in the disk spacings. Such inaccuracies are liable to occur due to manufacturing limitations in fabricating the relatively heavy gauge material from which the disks are fashioned, as well as the spacers between disks. As the oversize particles work into the interface openings or screening slots between the disks, they may be pinched and squeezed through the slots, and interfere with the desired uniformity of the screened product.
It is to the alleviation of the stated problem that the present invention is directed.
Accordingly, there is provided in a disk screen of the kind referred to a differential variance in the screening slot spaces along the length of the bed, for attaining greater screen efficiency. More particularly, the screening bed desirably has zones of progressively diminishing interface screening slot openings between the interdigitated screen disks from the intake end to the discharge end of the screening bed.
Other objects, features and advantages of the present invention will be readily apparent from the following description of preferred embodiments thereof, taken in conjunction with the accompanying drawings, although variations and modifications may be effected without departing from the spirit and scope of the novel concepts of the disclosure, and in which:
FIG. 1 is a partially cutaway side view of a disk screen apparatus embodying the invention.
FIG. 2 is a side elevational view representative of one of the disks of the kind mounted on the screen disk shafts of the apparatus.
FIG. 3 is a top plan view of the apparatus of FIG. 1; and
FIG. 4 is a fragmental enlarged plan view of a portion of the screening bed of the apparatus illustrating the progressive differential variance in the interface screening openings or slots along the length of the bed for attaining greater screen efficiency.
Except for differential variance in the interface screening opening or slot spaced relation between disks in the screening bed, the apparatus disclosed in the drawings may be substantially the same as disclosed in the aforesaid U.S. Pat. No. 4,377,474. Thus, referring to FIG. 1, the apparatus includes a frame 10 mounted on a base 11 carrying a screening bed 12 (FIGS. 1 and 3) defined by rotary screen disk shafts 13 extending in spaced parallel relation longitudinally from an inlet end provided with means such as a chute 14 by which particulate material such as wood chips intended for use in making paper pulp are directed to the intake end of the screen for screening of suitably refined, i.e., small size, fractions of the chip while coarser material advances on the screening bed to the opposite end of the screen, and is discharged from an outlet 15 (FIG. 1). Each of the shafts 13 is suitably rotatably mounted in the frame 10 and may be driven by means such as a chain drive 17 for rotation as intended for screening purposes, and as more particularly described in the aforesaid patent.
Each of the shafts 13 carries a set of spaced screen disks 18 (FIG. 2) corotatively fixed thereon. The disks 18 are desirab
REFERENCES:
patent: 1200241 (1916-10-01), Ritchie
patent: 2699253 (1955-01-01), Miller
patent: 3663142 (1972-05-01), Cafarelli
patent: 4377474 (1983-03-01), Lindberg
patent: 4430210 (1984-02-01), Tuuha
patent: 4479581 (1984-10-01), Kelyman, Jr.
Bielagus Joseph B.
Gobel Richard
Beloit Corporation
Campbell Raymond W.
Mathews Gerald A.
Reese Randolph A.
Veneman Dirk J.
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