Classifying – separating – and assorting solids – Sifting – Plane sifters
Patent
1979-11-23
1982-09-07
Yudkoff, Norman
Classifying, separating, and assorting solids
Sifting
Plane sifters
209389, 209324, 198779, B07B 128
Patent
active
043482759
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for separating fine material from coarse material, comprising a stationary perforated screen-cloth, a number of support members, means for jointing the support members to each other to form a closed chain in such a manner, that every support member extends transversely to the longitudinal direction of the screen-cloth and has a length corresponding substantially to the width of the screen-cloth, means for controlling and advancing the support members along a closed path, so that several of the support members carry the screen-cloth.
The screens at present in use, for example in the mining industry, for separating fine material from coarse material usually are so-called shaking screens, which comprise a screen-cloth subjected to a vibratory movement whereby the material on the screen is caused to "migrate about" on the cloth and thereby improves the efficiency of the separating operation. Screens of this type, however, have a very high noise level and also are heavily worn, due to the vibrations the screen parts are exposed to.
A machine for grading fruits also is previously known, which to a certain extent is similar in principle to the apparatus according to the present invention. There are, however, several very important structural differences between them owing to which the apparatus according to the invention has a better mode of operation than said known fruit grading machine.
The present invention has the object to provide an apparatus for separating fine material from coarse material, which apparatus has a substantially lower noise level and also operates more calmly than conventional screens, so that the mechanical wear is much less than at conventional screens.
The object of the invention is achieved by an apparatus having the characterizing features defined in the attached claims.
An embodiment of the invention is described in the following, with reference to the accompanying drawings, in which
FIG. 1 is a lateral view of the casing enclosing the apparatus,
FIG. 2 is a lateral view of the apparatus proper according to the invention, of which certain parts have been removed for reason of better clearness,
FIG. 3 is a schematic sectional view through the apparatus according to the invention, and
FIG. 4 is a partial sectional view showing a detail of the bearing and guidance of the carrying rollers.
It appears from the lateral view in FIG. 1 that the casing 2 enclosing the screen 1 is provided with covers 3 for access and inspection.
The material to be screened is supplied at the intake 4 at the feed end of the apparatus while the screened material drops out through the outlet 5 at the discharge end. The material separated during the screening process slides along two metal sheets 6 inclined in opposite directions (FIG. 3), and thereafter the separated material strikes against lateral metal sheets 7 before it drops down through an opening 8 located beneath the screening mechanism proper.
The screening mechanism shown in FIGS. 2 and 3 comprises a screen-cloth 9 in the form of a web, which is secured at its two end points 9a and 9b. Though not apparent from the Figures, the screen-cloth includes holes, through which the material drops down which has a grain size smaller than the hole diameter, and thereafter slides along the metal sheets 6 as mentioned above.
The screen-cloth 9 is supported between its end points 9a, 9b by a plurality of sets of carrying rollers 10, each set of which is mounted on a through axle 11. The carrying rollers as shown in FIG. 3 have a constant division along the axle 11.
The axles 11 are provided at their ends with travelling wheels 12, which as appears from FIG. 4 are mounted rotatably on an inner axle 11a. Inside of the travelling wheels 12 on one side of the axles 11a, chain pinions 13 are mounted which via a collar 14, which is passed through by a bolt 15, are rigidly connected to a pipe 11b mounted rotatably on the inner axle 11a. On the outside of the pipe 11b a wear protection 16, for example of rubber, is attached. transferred
REFERENCES:
patent: 532068 (1895-01-01), Jacobus
patent: 1468803 (1923-09-01), Contant
patent: 2052001 (1938-08-01), Platt
patent: 2141362 (1938-12-01), Platt
patent: 2296645 (1942-09-01), Marsden
patent: 2410147 (1946-10-01), Bleeke
patent: 2531292 (1950-11-01), Page
Linden-Alimak AB
Yudkoff Norman
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