Hutch chamber for jig

Details Hutch chamber for jig Hutch chamber for jig

2000-02-28

2001-09-11

Walsh, Donald P. (Department: 3653)

Classifying, separating, and assorting solids

Plural, diverse separating operations

Sifting and stratifying

C209S425000, C209S494000, C209S451000, C209S426000

Reexamination Certificate

active

06286686

ABSTRACT:

BACKGROUND OF INVENTION
This invention relates to jigs which separate materials in a feed mixture on the basis of differing specific gravities and especially, but not exclusively, to centrifugal jigs of the general type described in International Patent Publication Nos. WO86/04269 and WO90/00090, in which a feed slurry is introduced into a rotating chamber bounded radially by a screen provided with ragging on its inner surface, the ragging being dilated repetitively to provide jigging action.
In WO86/04269, the ragging is dilated by pulsing the water in a hutch chamber which surrounds the screen. The water is pulsed by means of a diaphragm positioned at the base of the hutch chamber. In WO90/00090, a number of hutch chambers are circumferentially spaced about the jig screen, with the water in the hutch chambers being pulsed sequentially. Each hutch chamber has a diaphragm positioned below the screen, with the diaphragms being actuated by respective pushrods driven by a central crank assembly.
SUMMARY OF THE INVENTION
The present invention seeks to provide an improved pulsating mechanism for a jig.
There is disclosed herein a centrifugal jig having a container mounted for rotation about a longitudinal axis thereof, the container having an axial region, a peripheral region including one or more hutch chambers separated from the axial region by ragging which is radially restrained by screen means, means for introducing feed material to the axial region and means for pulsating fluid in said peripheral region so as to repetitively dilate said ragging, characterised in that the pulsating means is located directly radially outwards of said screen means and includes a reciprocating radially outer wall portion of the respective hutch chamber, each reciprocating wall portion including a concentrate outlet and a convergence leading thereto.
Preferably the peripheral region includes a plurality of said hutch chambers circumferentially spaced about said axis, each hutch chamber having respective reciprocating drive means for actuating the respective reciprocating wall portion.
Preferably the reciprocating drive means includes a lever driven by a respective pushrod, and crank means for reciprocating each of the pushrods.
Preferably each reciprocating wall portion is biased to non-pulsating position by centrifugal motion of the jig.
Preferably each reciprocating wall portion includes a diaphragm with a support block.
Preferably each reciprocating wall portion reciprocates along a substantially radial line of action which intersects with the screen.
There is further disclosed herein a method of separating components of a feed material on the basis of specific gravity, the method employing the centrifugal jig of claim
1
and including the steps of introducing the feed material to the axial region and repetitively dilating the ragging by activation of said pulsating means.
There is further disclosed herein a jig having at least one hutch chamber, said hutch chamber having a reciprocating wall portion which includes a concentrate outlet and a convergence leading thereto.
Preferably reciprocation of said wall portion causes pulsation of fluid in the hutch chamber so as to effect repetitive dilation of a ragging layer in the jig.
Preferably the jig is a centrifugal jig and wherein the hutch chamber is located radially outside a screen means which supports the ragging.
Preferably the jig is a gravity jig and the hutch chamber is located below a screen means which supports the ragging.


REFERENCES:
patent: 1141419 (1915-06-01), Senn
patent: 2129795 (1938-09-01), Storsand
patent: 4279741 (1981-07-01), Campbell
patent: 4574046 (1986-03-01), Sprow
patent: 4898666 (1990-02-01), Kelsey
patent: 4998986 (1991-03-01), Campbell
patent: 5114569 (1992-05-01), Kelsey
patent: 5938043 (1999-08-01), Costin et al.

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