SU1281313A1 - Gravity classifier - Google Patents

Abstract

The invention is intended to separate powdered materials according to particle size and improves the efficiency of classification by eliminating material sticking on the shelves. For this, the inclined pouring shelves 2 placed on the inner walls of the pneumatic bolt are connected to the pneumatic bolt walls by elastic elements 7. A gas moving upwards to the flange 2 moves to the lower part of the pneumatic bolt 1 through the pipe (P) 4. motion. The source material, acts through P 3, is picked up by the upstream. Small particles move together with the gas flow upwards and are discharged through the P 5. Large particles move down and are discharged through the P 6. The vortex motion of the gas and the material forms between the transfer shelves 2, and the material is cleaned in it, which improves the classification efficiency. . 4 il. I (L with

Description

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The invention relates to the classifiers of powdered materials by particle size and can be used in chemical technology in the cement, mining and other industries.

The purpose of the invention is to increase the efficiency of classification by eliminating material hanging on the shelves.

FIG. 1 shows the classifier, a general view; in fig. 2 shows embodiments of elastic elements for fastening the shelves to the walls of the pneumatic shaft in FIG. 3 is a diagram of the movement of material along the shelves in the known classifier (c |) and in the proposed (6); Fig. 4 shows the curves of the separation efficiency as a function of the concentration of the material in the proposed classifier and in the known.

The gravity classifier contains a pneumatic shaft; 1 with the pouring shelves placed on its inner walls 2 and the connection pipe 3 to the body of the source material, the pipe 4 for supplying gas, the pipe 5 for withdrawing the fine product of classification and the pipe 6 for withdrawing large particles. The pouring shelves 2 are connected to the shaft 1 via elastic elements 7, examples of which are shown in fig. 2

Classifier works as follows.

Through the pipe 4, gas moving through the body up to the pipe 5 is supplied to the lower part of the shaft 1. When the gas is moving, the transfer shelves 2 connected to the body 1 through the elastic elements 7 come into a transverse self-oscillatory motion. The source material is fed through the pipe 3, located approximately in the middle of the height of the housing 1, and is sucked up by a rising stream. At the same time, small particles move together with the gas flow upwards and are discharged through the pipe 5, and large ones downwards against the gas flow and are discharged through the cartridge 6. The vortex motion of the gas and the material is formed between the pouring shelves 2, and cleaning is performed in it material that improves classification efficiency. The material involved in the vortex motion falls on the pouring shelves 2, and due to the oscillatory motion of the latter it is accelerated

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downward movement on the upper sides of the shelf shelves 2, thereby eliminating material sticking on the shelves, movement and dumping it in a continuous flow in a thick layer.

With a high unit capacity (high material concentration in the flow), the material begins to move along a fixed shelf in a continuous flow and discharges from the shelf, eliminating or making it difficult to separate particles by gas flow, which leads to a sharp decrease in the classification efficiency when the material hangs on the shelves (Fig .Behind). When moving along an oscillating shelf, particles are shaken, they are reflected from the surface of the shelf, as a result of which the flow porosity increases dramatically and the gas continues to separate particles by size and at high concentrations (FIG. 3).

Increasing the load on the material without reducing the classification efficiency will improve equipment performance or reduce the number of classifiers with consistent performance.

To assess the comparative effectiveness of the proposed design, experimental studies of models of known and proposed classifiers have been carried out. Classification efficiency is assessed by class-0.1 extraction into a thin product and is calculated using the formula

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where 4 - the content of the class is 0.1 mm in the initial product; D, - in thin, H - full yield of thin product.

For the well-known classifier fi 0.77.

From the presented dependencies of W. (Fig. 4) on the concentration j of the material supplied to the apparatus, for models of the known and proposed classifiers, it is clear that both designs have almost the same efficiency up to a concentration of / and 1.5 kg / m With a further increase in concentration, the efficiency drops, but the model has a well-known classifier much more dramatically. Thus, it decreases to 0.77 for the proposed classifier at a concentration (and, consequently, productivity) by 40% more than the known one.

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Claims (1)

Invention Formula Gravitational classifier containing vertical pneumoshaft with placed on its internal walls as inclined pouring shelves, branch pipes for supplying source material and gas and removal of finished products, characterized in that, in order to improve the classification efficiency by eliminating material hanging on the shelves, the pouring shelves are connected to the walls of the pneumatic shaft with elastic elements. / ofleffaffufl Wed 1 / 8.2  figs N | 55 "Xs S5G Editor H. Blunt Compiled by Yu. Pravtorov Tehred L.Oleynik Proofreader M. Pojo Order 7186/7 Circulation 538 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 " : s l c subscription