SU831204A1 - Centrifugal classifier - Google Patents

Description

(54) CENTRIFUGAL CLASSIFIER

one

The invention relates to the enrichment of minerals, namely, to devices using which dry screening of wet and hard bulk materials is carried out, and can be used in the coal, mining, construction and other industrial fields.

Known centrifugal classifier, comprising a housing, a rotor with lower and upper disks, made with concentric grooves 1.

The disadvantage of this classifier is that humid fines constantly accumulate and condense in the grooves of the grooves, as a result of which the screening efficiency is reduced.

A centrifugal classifier is known, which includes a housing, a vertical shaft with bushings on which the wires of string screening surfaces, made in the form of discs, are fastened with needles. The screening surface is formed by radially directed strings 2 attached to the discs.

The disadvantage of this classifier is that the screening surface is made of radially located strings.

forming triangular shaped slots, stretched as the strings move away from the vertical shaft, and the longer the strings, the wider the gap between them. This causes the ingress of a large number of grains into the sub-breeze product, the size of which greatly exceeds the separation boundary size, thereby dramatically reducing the efficiency of screening.

The purpose of the invention is to increase the efficiency of screening of wet bulk materials.

This goal is achieved by the fact that the disks of the centrifugal classifier are made in the form of concentrically arranged rings, while the strings of the screening surfaces are fixed on each ring with a deviation from the radial direction.

In addition, the strings of the screening surfaces of two adjacent Russes are fixed on the rings with a deviation from the radial direction in opposite directions.

FIG. 1 shows a centrifugal classifier, a general view; in fig. 2 - section

A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 is a view of B in FIG. 3

The centrifugal classifier includes a circular case 1, a vertical shaft 4 divided by an outer 2 and an inner 3 compartment with a drive unit 5, loading chute 6, screening surfaces of quality 7 formed from concentrically arranged rings 8 and strings 9. Rings 8 are mounted on 10 x attached to the vertical shaft 4 with the help of sleeves 11 with the possibility of turning, and fixed with the help of locking screws-clamps. Such a fastening allows the strings 9. To be oriented in the necessary direction. Between the rings 8. The sifting surfaces consist of a series of Rus 12, the number of which must be at least two. The strings of the adjacent. Rus are fixed with a deviation from the radial direction in opposite directions. The edges of the rings 8 somewhat protrude above the surface of the strings, which contributes to the better loosening of the layer of the tremendous material and increases the duration of its contact with the elementagush of the screening surface. It also intensifies the screening process.

The planes of the screening surfaces of the Rus can be made both horizontal and concave.

The conditional cells of a rhomboid shape (Fig. 4) are formed by deviating from the radial direction of the strings of adjacent Rus in opposite directions. The resizing of the rhomboid cells into the larger or smaller side is done by turning the sleeves 11 relative to the shaft 4 in the corresponding directions, which causes the turning of the rings 8 relative to each other on this track.

Centrifugal classifier works as follows.

The vertical shaft 4 with the sifting surfaces rotates at a predetermined speed. An initial power supply, such as a charcoal, is supplied to a charging device 6, from which it is fed to the upper sieving surface 7. Under the influence of centrifugal force, the coal is distributed on the surface of the network formed by the strings. The grains of the undercutting product pass between the strings on the lower located Rus and, having passed through it, enter the inner compartment 3 of the housing 1. The oversize product, moving along the strings 9 to the periphery, enters the outer compartment 2 of the housing. The screening products of compartments 2 and 3 are discharged as intended. If it is necessary to sieve on the classifier of a regular coal with a large upper size limit, for example, more than 50 mm, the screening surface of the upper tier can be formed by massive rods acting as a discharge sieve.

The proposed classifier allows one to maintain a width of 1 piece by installing pre-strings on concentric rings, allows deviating strings from the radial direction and forming cells of a rhomboid shape, which excludes grains larger than the boundary separation size from entering the sub-mesh product. At the same time, a significant excess of the gap width between the strings above the grain size of separation with a small thickness of the latter prevents the wetting of the screening surface with a wet fines. All this ensures the high efficiency of the process of dry screening of wet bulk materials. When sowing particularly difficult clay clay materials, the screening surface of each tusk can be equipped with a simple-type cleaner, based, for example, on the principle of pulling strings of elastic m with a rod.

The use of a centrifugal classifier for dry screening of moist anthracite and steam coal before enrichment allows:

a) to significantly reduce the loss of high-grade fuel in low-value screenings that are available when using commercially available screens and sieves;

b) improve the enrichment process by better preparing machine classes for enrichment;

ij) simplify the water-slag. heating circuits and reduce the output of energy amy.

Ph oomul inventions

Claims (2)

1. A centrifugal classifier, including a body, a vertical shaft with sleeves, which are fastened to the needles; the screening surfaces made in the form of discs, characterized in that, in order to increase the efficiency of screening wet bulk materials, the discs are made concentrically arranged rings, while the strings of the screening surfaces are attached to each ring deviating from the radial direction. 2. A classifier according to claim 1, characterized in that the strings of the screening surfaces of the two interchangeable wheels are fixed on the rings with a deviation from the radial direction in opposite directions. Sources of information taken into account in the examination 1. Author's certificate of the USSR L 417186, cl. At 07 On 7/08, 1972. 2.Patent UK N ° 1307290, cl. In 2 N, 1973.