Method of making centrifuge screen baskets

DETAILED DESCRIPTION The improved method of the present invention of making centrifuge screen baskets is particularly designed for making vertically or axially segmented frusto-conical screen baskets such as the exemplary basket 1 of FIG.
1.
Formed of vertically or axially extending, conically curved or conical segments 28 welded together along adjoining sides and which, as in the illustrated basket 1, suitably may be counterpart or identical quarter segments, the basket has an internal screening surface 9 formed by desirably flat faces or bases 20 of vertically extending wedge-shaped profile screen wires or rods 21, which in each segment preferably are parallel and laterally equally spaced by longitudinally coextensive slots 23 of inverted V-shape.
With initially somewhat rounded backs or outer edges 22, the screen wires 21 of the product or finished basket 1 are connected and externally backed by a plurality of vertically or axially spaced parallel circumferential tie bands 24 welded at intersections to the backs of the screen wires and each centered on and perpendicular or normal to the basket's axis.
In making the screen basket 1 in accordance with the method of the present invention, each of the segments 28 is initially fabricated or formed as a generally sectoral planar substantial projection or reproduction 28 of its final conical shape by clamping a plurality of inverted or face-down screen wires 21 in parallel and equally spaced relation to a flat work surface 33 by a plurality of guide bars 34 bolted or otherwise releasably anchored at ends to the work surface and having concentric cylindrically curved concave inner and convex outer faces 36 and 40, respectively, each struck about the intersection, indicated at 41, of converging radial lines or, more precisely, planes 42 demarking the projection's sides.
With the screen wires 21 so clamped and the guide bars 34 preferably equally radially spaced, there is inserted in each of the spaces 35 between adjoining guide bars a flat precurved section or segment 24a of appropriate length of a corresponding tie band 24 having parallel cylindrically curved concave inner and convex outer edges 25 and 26, respectively, the latter or outer of which is coradial and concentric with the inner face 36 of the guide bar at the outside of the particular space