SU1607978A1 - Method of screening loose material - Google Patents

Abstract

The invention relates to the separation of bulk materials (SM) into size classes and can be used in the construction industry, agriculture and powder technology. The goal is an additional separation of the selected size classes into particles of an isometric and oblong shape. The initial polydisperse mixture CM is fed successively to the vibrating sieves (P), arranged in decreasing order of cell size, and screening is carried out with the release of the sublattice and sublattice of the SM fractions. Screening on each subsequent P is subjected to undersize fraction, selected in the previous operation. At the same time, on P with the same cell size, screening is carried out sequentially with two modes of vibration: first with the mode of tossing, and then with the mode with sliding CM on the surface P. These operations are repeated in the same sequence for P of each cell size. The vibration modes are set by the angle α of the direction of vibration to the surface P. In the mode with tossing α = 75 ... 90 °, in the mode with sliding α = 0 ... 10 °. 3 il.

Description

one

(21) 4387297 / 25-03

(22) 02.03.88

(46) 11/23/90. Bul No. 43

(71) Special Design and Technological Bureau of the Institute of Geotechnical Mechanics of the Ukrainian SSR Academy of Sciences

(72) And. A. Shul to, A. P. Archakov, V. A. Drozdenko, V. M. Prozorov and A. I. Puchkov

(53) 631.362.22 (088.8)

(56) USSR Copyright Certificate No. 223514, cl. At 07 P 1/30, 1967.

Andreev S. E., Perov V. A., Zverevich V. V. Crushing, grinding and screening of minerals. M .: Nedra, 1980, p. 54, fig. 29a

(54) METHOD FOR MOUNTING BULK MATERIAL

(57) The invention relates to the separation of bulk materials (CM) into size classes and m. used in construction industry, agriculture and powder

technologists x. The goal is an additional separation of the selected size classes into particles of an isometric and oblong shape. The initial polydisperse mixture of CM is fed successively to the vibrating sieves (P), arranged in decreasing order of cell size, and screening is carried out with separation of the superlattice and subsolar fractions of the CM. At each subsequent P, the undersize fraction isolated in the previous operation is screened. In this case, on P with the same cell size, screening is carried out sequentially with two modes of vibration; first with the flip mode and then with the slip mode CM on the surface P. These operations are repeated in the same sequence for P of each cell size. The vibration modes are set by the angle and the direction of vibration to the surface P. In the mode with tossing a 75-90 °, in the mode with sliding a 0-10 °. 3 il.

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The invention relates to the field of separation of bulk materials into size classes and can be used in the construction industry, agriculture and powder technology.

The purpose of the invention is an additional separation of the selected size classes into particles of an isometric and oblong shape.

FIG. Figure 1 shows the material separation scheme when screening it in a slip mode on the surface of the sieve; in fig. 2 - the same, in the mode of toss; in fig. 3 shows a flow chart for the separation of a polydisperse mixture of material from a large class to a small one.

The method is carried out as follows.

The initial polydisperse mixture of material with particles of various sizes and shapes is fed to vibrating plates 1, arranged in decreasing order of cell sizes. First, the material is processed on a sieve of the first size on a sieve vibration mode, in which the material moves along the screening surface with tossing, for example, at a vibration node a 75-90 °. This allows you to highlight c. the undersize fraction from the total mass of a particle of oblong 2 and isometric 3 forms with a transverse size smaller than the size of cell 4 of a sieve of perO5

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all sizes. Then, the undersize fraction is screened on sieve 5 with the same cell size in the mode in which the material moves along the screening surface with sliding, for example, at a vibration angle of 0-10 °. At the same time, particles npoj of the durable form 2, having a transverse size smaller than the size of the sieve cell 4 of the first size, remain in the supernatant fraction. elongated particles of first class size.

The selected sublattice fraction after the second screening mode on the sieve of the first size, the screen t on the second size sieve in the mode of tossing the material. In this operation, particles of an isometric shape with a transverse size smaller than the first sieve cell and larger than the second sieve cell, i.e. Isometric particles of the first class of size are selected. In this case, all particles with a transverse size smaller than the size of the sieve cell fall into the sublattice fraction. Subsequent screening of this fraction on a sieve of the same size in the mode of vibration with the material sliding over the surface allows to distinguish elongated particles with a transverse size smaller than the size of the sieve cell, i.e. elongated particles of second class size. Particles of an isometric form of the second class of size are emitted into the above-sieve fraction at screening in the throw mode on the sieve with the cells of the third size. More particles

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small classes produced in a similar sequence.

Separation of polydisperse mixtures can be conducted from the small class to the large. In this case, on sieves with the same cell size, the sequence of performing the screening modes is changed, i.e. first rumble on the slip mode of the material, and then on the flip mode. In addition, each subsequent screening is performed with a mixture of material released into the oversize fraction at the previous screening operation.

Claims (1)

Invention Formula The method of screening the bulk material, including the supply of material to the vibrating sieves and screening it successively on each of the sieves from the large to the small class with the release of the superlattice and sublattice fractions, characterized in that in order to provide additional separation of the selected classes into isometric and elongated particles Forms, screening is carried out on sieves with the same cell size in series with two modes of vibration, first with the mode of tossing, and then with the mode with sliding m Therians on the surface of the sieves, the sieving are subjected to the second mode only the undersize fraction separated at screening of the first mode, and said operation is repeated in the same sequence for each sieve size cells. c.-o-fO, V Rodol oboty UFO her and krupnos / L1 / l / ltnMpm  llnUL / l U 1/1 home / priies / (io ifflnrrn kpipnos- / 7 -3: H30Mefnputjecf uu i 2nlasso large- Prodol-.  ff3 fe / 7 / p (/ i / gloss of jesnia f pi / nHOcmu ieniinunr if its neither and fnlossa size . ppp -3: f ff3 fe / 7 / p (/ ca jesnia cmu ieniinunr if it is neither, nor F /, and f Lnloss of rnbiumac coarseness is large FIG.