SU1572712A1 - Gravity transverse flow pneumatic classifier - Google Patents

Abstract

The invention relates to the pneumatic classification of various bulk materials, is intended to divide the grain into 50-5000 microns into two or more products and can be used in the mining, metallurgical, construction and other industries. The purpose of the invention is to improve the quality of separation due to repeated selective cleaning of the material in the separation channels. The classifier includes a separation chamber, parallel inclined plates, stepped inside the separation chamber with the formation of longitudinal separation channels, and a loading device. Additionally, flow shapers were introduced, each of which is made in the form of a flat sheet with an end bend, while the plates of each stage are installed in several rows along the length of the separation chamber. The length of the plate of each row is 6-10 times the height of the longitudinal separation channel. 1 hp f-ly, 3 ill.

Description

The invention relates to the pneumatic classification of various bulk materials, is intended to divide the grain between 50 and 5000 µm into two or more products and can be applied from the mining, metallurgical, construction and other industries.

The aim of the invention is to improve the quality of separation due to repeated selective cleaning of the material in the separation channels.

FIG. 1 depicts a gravitational cross-flow pneumatic.

classifier, general view ;, in figure 2 - node I in FIG. one; in FIG. 3 is the same as the embodiment.

The gravitational cross-flow pneumatic classifier includes a separating chamber I, inside of which longitudinal rows of plates 2 are stepped mounted with gaps between the ends of the plates. The plates 2 form parallel inclined separation channels 3. In the gaps between the ends of the plates, the Formers of 4 continuous and discrete medium streams are installed, which are lis3

gig with butt bends, gaping envelopes of the lower ends of plates 2, length L of plates 2 not less than 6-10 heights of DK channels 3.

Classifier works as follows.

The source material is supplied to the upper front part of the inclined plates 2 and, moving downward, pouring the plates onto the plate, is wired with a cross-flow of air. The coarse fraction under the bottom of the apparatus is a finished large product. The quality of the finished large Product depends on the number of smelting and lining of the large fraction of the Material - the height of the apparatus.

The fine fraction with the air flow enters the separation channels 3 formed by the plates 2. When the thin fraction moves along the separation channels 3, it is repeatedly intersected, after which it is removed from the separation chamber 1 as a dusty air flow and enters the device for separating the finished fine product, for example, into a cyclone. Due to the fact that the Formers of 4 air and digital media streams are installed in the gaps between the plates 2, the process of cleaning out the Fractions does not occur at the expense of simple precipitation. ASTs along the length of the chamber, but due to repeated transfer and rewinding. At the same time, the Formers 4 streams of continuous (air) and discrete (partly ig) medium partially overlap the living section

separation channels, as a result of which a throw (increase) in the speed of air movement through the channel is created at the place of installation of the form-room. This favorably affects the quality of the fine fraction, as it is accelerated by the action of the speed (acceleration) flow.

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and blown more intensively into small (low inertia) particles.

Large particles due to the larger diameter are more inertial and do not have time to be carried away by the air flow. Large particles randomly captured by the flow are deposited as they move through the channels on the inclined surface of the plates, since the length L of the plates is 6-10 times longer than the height DK of the living section of the channel. With such a ratio of the living section and the length of the channel, the air flow rate has time to equalize, i.e. in the cross section of the channels before the fairings, the speed is lower than in the place of their installation. Thus, the Formers promote the selective effect of the cleaning up of such fractions — small particles are subjected to more intensive sweeping effect, while the larger ones are more efficiently precipitated from the stream.

The gaping envelopes of the bottom ends of the plates form the streams of discrete media (particles) in such a way that a layer of material moving down the inclined surface of the plates 2, which is formed during the deposition of particles in the channels, is periodically retracted to the downstream channel. At the same time, fine particles randomly deposited on the surface of the plates have the ability to return to the air flow and escape from the apparatus.

Thus, due to the installation of the envelopes of the plates of the formers, the process of cleaning the fine fraction proceeds throughout the entire volume of the separation chamber. Acts of cleaning up - sweeping and sedimentation are carried out repeatedly and have a selective effect: fine particles are more intensively subjected to dynamic effects of flow. All this determines the efficient cleaning up of the fine fraction and improves the quality of separation.

Original product

Air

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Cold air flow

H- Large Product

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Claims (2)

1. GRAVITATIONAL TRANSVERSE THREAD PNEUMATIC CLASSICS -. TOR, - including a separation chamber, parallel inclined plates installed stepwise inside the separation chamber with the formation of longitudinal separation channels, and a loading device, characterized in that, in order to '2. Improve the quality of separation due to multiple selective cleaning of the material in the separation channels, the classifier equipped with flow formers, each of which is made in the form of a flat sheet with an end bend, while the plates of each stage are installed. in several rows along the length e separating chamber, flow conditioners installed with face plates between the rows of pleats, rounding with gap mountaineers plates each subsequent series, a sheet shaper streams were spaced and oriented parallel to the plates and the ends without creases in the side ie the subsequent series of plates. 2. Classifier by π. 1, characterized in that the plate length of each row is 6-10 times greater than the height of the longitudinal separation | channel.