SU882656A1 - Air-classifier - Google Patents

Description

(54) AIR CLASSIFIER

one

The invention relates to a technique for the production of nonmetallic building materials and can be used in crushing plants, as well as in various sectors of the national economy, where the classification of fine-grained materials is necessary.

The air classifier is known, which includes a housing, a separation chamber, loading and unloading devices for the material, and nozzles for supplying and discharging air 1.

The disadvantage of this air classifier is the low effectiveness of cleaning large grains of dust particles at high humidity of the source material.

The closest technical solution to the proposed one according to the function performed and the achieved result is an air classifier, including a housing, a horizontal chamber of classifications, loading and unloading devices of the DPP material, suction and exhaust pipes for air 2.

The disadvantages of the known air classifier are the low efficiency of cleaning large grains of rubble from adhering particles, intensive wear of the working bodies of the rotating grates due to their high abundance

 non-metallic materials, maintenance complexity, as for efficient operation of the classifier, the installation of one or two rotating grates is insufficient, and the installation of three or several

10 also entails the use of several autonomous drives. In addition, the finished product is clogged with small classes of material in the dedusting of wet rubble.

The purpose of the invention is to improve the quality, 5 VA classification by cleaning the surface of the source material from dust.

This goal is achieved by the fact that the air classifier is equipped with dispersing rotors made in the form of plane-parallel plates, on the periphery of which are placed strings of elastic material.

Claims (4)

In this case, the distance between two adjacent strings is greater than double the maximum particle size, and the diameter of the string is less than the boundary of material separation in the horizontal classification chamber. In addition, dispersing rotors are embedded in the form of rings or discs. FIG. 1 shows the air classifier; in fig. 2 - the same, front view; in fig. 3 shows section A-A in FIG. 2. The air classifier consists of case I, which is divided by a vertical wall 2 and has three chambers: dispersion chamber 3, horizontal classification chamber 4 and dust precipitation chamber 5, as well as loading device 6, exhaust pipe 7 and three discharge chutes for large 8, small 9 products of classification and precipitated dust 10. In the dispersion chamber 3 there are two rotors arranged coaxially, outer II and inner 12 rotatably in opposite directions, as well as a lamellar reflector 13. Dispersant The chamber 3 is separated from the horizontal chamber 4 of the classification by oblique heat 14 in the form of a louvered grille. In the horizontal classification chamber, an inlet nozzle 15 and a paddle cutter 16 are installed to adjust the separation boundary. In the vertical wall 2 there is a window 17, the width of which is adjusted by the valve 18. The structures of the cylindrical dispersing rotors 11 and 12 differ only in size. Each rotor has (Fig. 2 and 3) supporting discs 19, between which intermediate rings 21 are mounted on supporting rods 20. Between the supporting discs 19 along two or more concentric circumferences along the periphery of the plane-parallel rings 21, the tensioned strings 22 are made of elastic material. The lines connecting the ends of the tensioned strings form a broken line (indicated in Fig. 3 by the dotted line). The distance between the two strings is at least two diameters of the upper fraction of rubble, and the bottom is. The meter of the string is less than the boundary value of the material separation in the horizontal kamsro classification. For example, if in a horizontal chamber a product of a fraction of 10–0.14 mm is classified into two fractions for a boundary grain of 3 mm, then the distance between two strings should be at least 20 mm, and the diameter of the strings should not exceed 3 mm. . The categorizer works as follows: Bulk material — rock crushing screenings, for example, fraction 0-0 mm — through loading device 6 enters the dispersion chamber 3, where it falls on the surface of outer 11 and inner rotor 12 and is subjected to repeated strikes of strings 22 from elastic material. When this occurs, the material is selectively dispersed, i.e., aggregates and granules of dust particles and formed with a crinkle on the surface of the shepherd, having low mechanical strength, are destroyed by the impacts of the strings, but at the same time the impact force of the elastic material strings crushed stone with greater mechanical strength than aggregates of dust or granules. The dust generated by dispersing the dust aggregates and cleaning the surface of large grains is removed by an upward air flow through the window 17 into the dust precipitation chamber 5, and the dust-free air through the exhaust manifold 7 is removed from the apparatus. The ingress of coarse material through the window 17 into the dust precipitation chamber 5 under the action of centrifugal forces is prevented by a plate-shaped reflector 13. The granular material cleared of dust particles through the inclined louvre flow 14 is suspended in a horizontal chamber 4 of the "d" section by the action of an air inlet coming from the nozzle 15, is classified into two fractions, and the clarity of separation is regulated by the cutter 16. The classified material is removed from the apparatus through discharge chutes 8 and 9. The classified material is removed from the apparatus through discharge chutes 8 and 9. Claims An air classifier comprising a housing, a horizontal classification chamber, loading and unloading devices for the material, suction and exhaust pipes for air, characterized in that, in order to improve the quality of the classification by cleaning the surface of the source material from dust, it is equipped with dispersing rotors, made in the form of plane-parallel plates, on the periphery of which the strings are made of elastic material. 2. Classifier according to claim 1, characterized in that the distance between two adjacent strings is greater than twice the maximum particle size, and the diameter of the string is less than the boundary of the material separation in the horizontal classification chamber. 3. Classifier according to claim, characterized in that the dispersing rotors are made in the form of rings. 4. Classifier according to claim I, characterized in that the dispersing rotors are made in the form of discs. Sources of information taken into account when exprms 1. Author's certificate of SC.1 According to application number 2473911 / 29-03. cl. B 07 P 1/08, 04/05/77 2.Barsky M.D. n. Dr. Gravitainp h classification of granular materials. A., “Nedra, 1974. p. 10. fig. 3-D. / 3 A-A. // / 20