Device for separating rubber and textile fibres from their bonded mixture

摘要

980,698. Rotary sieves. H. A. MERGES. Dec. 11, 1961 [Dec. 10, 1960], No. 44310/61. Heading B2H. An apparatus for the separation and classifying of fibres and grains of bulk material such as pre-crushed mixtures of rubber and fabric from vehicle tyres comprises a rotary sieve drum having sections of different mesh size, and a relatively rotatable shaft within the drum and provided with rods radially extending from helical lines on the shaft into spaces between rods extending radially inwardly from the longitudinal periphery of the drum, the drum rods being substantially equal in length in the sections near the input end and progressively shorter and spaced further apart in succeeding sections; and the drum having a truncated conical or pyramidical end section with spaced comb-like rows of teeth on its inner longitudinal periphery, a baffle and discharge shoot. In Fig. 1 hexagonal sectioned drum 1 drawn by motor 2 is arranged to rotate in a direction either opposite to shaft 5 driven by motor 6 or in the same direction but at a different speed. The mesh size on the drum longitudinal walls is progressively larger away from an input shoot 9. In operation bulk material is fed in through shoot 9 and the combing and beating effects of the drum rods 3 and shaft rods 4 at the input section where the rods are densest is said to separate the components of the material, some of the rubber particles passing through the drum mesh to discharge shoot 12. The remaining material passes to the succeeding sections and the process is continually repeated, the rubber particles according to size passing through the mesh and down shoots 13-16 where they are carried away preferably by pneumatic suction means. The truncated conical end section, Fig. 1 (and Fig. 2, not shown), has equispaced combs 8 which take up the fabric fibres and drop them on to a baffle 10 which in turn deflects them through a discharge shoot 11. The shaft rods 4 may be resiliently flexible so that they can be bent back by the bulk material and then beat with increased force or stops may be provided on the drum for the bending process. Alternatively the shaft 5 may be eccentric to the drum's rotational axis or it may be cranked. Instead of radial rods the drum and shaft rods may be inclined to a radius.