US 4,569,761 A · Centrifuge sieve and method of producing the same

Abstract

In a centrifuge sieve drum, wherein the inner surface of the drum is lined with a support arrangement carrying wear-resistant sieve or screen rods, there is obtained a compensation of the different thermal expansions of the sieve rods and the support arrangement in that, the sieve rods comprise an axially extending web and the support arrangement comprises identically shaped grooves or slots engaged by the webs. Each web and its associated groove or slot may be designed, for example, as a dovetail guide. Thus, while the sieve rods may expand or contract in longitudinal direction or in the direction of the lengthwise axis of the drum, the sieve rods are, however, immovable in radial direction and in circumferential direction. Such a support arrangement can be efficiently manufactured by simultaneously cutting, such as by milling the grooves or slots and sieve openings or slots in a convex outer surface using a triple cutter, such as a milling cutter, and by subsequently bending the supporting arrangement to form a concave surface and inserting the same into the drum.

Claims19

Dependent claims

A centrifuge sieve comprising:

a centrifuge drum defining an axial direction and having an inner surface;
a support arrangement provided at said inner surface of said centrifuge drum;
sieve rods mounted at said support arrangement and extending in said axial direction of said centrifuge drum;
said sieve rods being formed of a wear-resistant material;
and
said sieve rods and said support arrangement containing substantially complementary shaped interengaging connecting means permitting movement of said sieve rods relative to said support arrangement only in said axial direction.

3 more elements

In a method of manufacturing a centrifuge sieve including a centrifuge drum having an inner surface, a support arrangement provided at said inner surface, sieve rods formed of a wear-resistant material and mounted at said support arrangement so as to extend in an axial direction of said centrifuge drum by means of webs having a substantially trapezoidal cross-section which are interengaged with complementary shaped grooves formed in said support arrangement, said method comprising the steps of:

cutting into a starting material for said support arrangement which is bent to form a convex surface inclined grooves extending outside a lengthwise axis of said convex surface and having substantially parallel side walls;
cutting further inclined grooves with substantially parallel side walls and of opposite inclination relative to said lengthwise axis into said inclined grooves;
and
subsequently bending said support arrangement to form a concave surface corresponding to said inner surface of said centrifuge drum.

1 more element

Dependencies are inferred from the claim text.

Centrifuge sieve and method of producing the same

Life of this patent

Centrifuge sieve and method of producing the same

Life of this patent

Abstract

Claims19