Grader

Abstract

The invention provides a classifier capable of sieving a powder material into particles of different sizes and belongs to the field of sorting. The classifier comprises an outer shell, an inner shell, an outer shell cover, a supply pipe, a discharging pipe, sliding grooves, swirl vanes and a sieving zone, wherein the outer shell and the inner shell are coaxial with each other; the supply pipe is used for supplying a to-be-sieved raw material; the discharging pipe is used for discharging a fine-particle product; the sliding grooves are used for discharging an unqualified product; the bottoms of the swirl vanes are rotatably connected onto perpendicular shafts; the perpendicular shafts are arranged on the top edge of the inner shell; the sieving zone is encircled by the swirl vanes and the discharging pipe; a plurality of sieving holes are formed in the discharging pipe within the height range of the sieving zone; an inverted conical cap is connected into the discharging pipe; and a vent hole is formed in the top of the conical cap. Accordingly, the cross flow of large and small particles can be reduced, and the sieving efficiency can be improved.

Description

technical field [0001] The present invention belongs to the field of sorting. Background technique [0002] The invention relates to a mechanism for screening raw materials into particles of different sizes, which can be used in the production of fertilizers. [0003] There is a known classifier with an outer and an inner coaxial conical housing, an outer housing cover, an axial branch pipe for supplying raw material for screening, with its bottom fixed to an inner housing Rotating swirl vanes on a vertical axis above the top edge of the body, a screening area enclosed between the outer shell cover and the outlet edge of the blades and the fine product discharge pipe (see L.A.Letin, K.F-Roddatis, "Medium Speed and low-speed factories", 1981, p. 74, figure 2 .twenty four). [0004] The disadvantage of this kind of classifier is that due to the small height of the discharge pipe that carries away the fine-grained products, large particles often overflow directly through the...

AI Technical Summary

Problems solved by technology

This classifier solves the problem of low screening efficiency

However, when the material enters the discharge pipe, the unqualified products with light weight and large volume will also be discharged together with the qualified products, so this equipment has the problem of high failure rate

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