SU1579588A2 - Pneumatic classifier - Google Patents

Abstract

The invention relates to the pneumatic classification of polydisperse bulk materials and can be used in the building materials industry, ore dressing, chemical and other sectors of the national economy. The purpose of the invention is to improve the quality of separation by optimizing the mode of supply of the mixture to the separation channels (SC) and the intensification of the impact on the material being processed. In the case 1, packages of 2 vertical inserts are formed, forming vertical ICs 3. Under the inserts 2, discharge strips 4 of V-shape are installed. Under the strips 4 with a gap and symmetrically with respect to their vertices are located distribution elements (ER) 5 with the possibility of vertical movement and / or rotation about their vertical axes. On the body 1 fixed nozzles (P) supply of the source material and air 7 and collections of 9 finished products. Bands 4 are installed in a horizontal plane with the possibility of forming gaps symmetrical about the vertical axes of the SC 3. The number of SC 3 increases in the direction of the air flow. The source material through the feed P enters P 7 and is transported to SC 3. In the area between the ER 5 and P 7, due to the decrease in the air flow rate, the largest particles are released, which under the force of gravity release a collector 9. The remaining material with air enters channels formed by strips 4 and РЭ 5, where the dispersion of aggregates of particles takes place. When moving along SC 3, particles of larger fractions are released from the air mixture, which in lanes 4 enter the collection 9. 1 Cp. f-ly, 2 ill.

Description

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The invention relates to devices for the pneumatic classification of polydisperse bulk materials, can be used in the building materials industry, mining, chemical, and other folk industries and is an improvement to the invention in accordance with the authors. St. No. 1438860.

The purpose of the invention is to improve the quality of separation by optimizing the mode of supply of the mixture to the separation channels and the intensification of the effect on the material being processed.

FIG. 1 shows the pneumatic classifier, general view; in fig. 2 - the same, side view.

The pneumatic classifier comprises a housing 1 with packages of vertical inserts 2 installed in it, forming vertical separation channels 3. Under the inserts 2, discharge strips 4 of V-shaped form are installed in a horizontal plane. Distributing elements 5 are installed under the unloading strips 4 with a gap and symmetrically with respect to the peaks. On the body 1 of the classifier there are nozzles for supplying raw material 6 and air 7, nozzle 8 for venting air and the thinnest separation product and collections 9 for finished products. The discharge strips 4 are installed with the possibility of forming gaps symmetrical with respect to the vertical axes of the channels 3. The number of channels 3 increases in the direction of the air flow.

Pneumatic classifier works as follows.

The source material through the nozzle b enters the nozzle 7 and is transported to the separation channels 3. In the area between the distribution elements 5 and the nozzle 7, due to a decrease in the air flow rate, the largest particles are released, which fall under the force of gravity into the collector 9.

The remaining material with air enters the channels formed by the discharge strips 4 and the distribution elements 5, where the dispersion of aggregates of particles takes place. When moving along the separation channels 3, particles of larger fractions are separated from the aerosol, which are discharged into discharge tank 4 along discharge lines 4. Next, the aerosol mixture is fed into the next package of vertical inserts 2, where similar processes occur. The thinnest product with air through the pipe 8 enters the dust-removal system.

Pneumatic classifier can work directly behind the mill-ventil0

0

l torus In this case, the mixture from the mill is fed through pipe 7 directly to the classifier, and pipe b is closed.

The location of the distribution elements in front of the discharge lanes in the gap between them allows a more even distribution of the air flow through the separation channels due to the additional air overpressure in the diffuser zone in front of the discharge lanes, which leads to equalization of the separation fractional size in the packet channels. separation accuracy. In the channels formed by the dividing elements and discharge strips, due to a significant increase in the speed of the air mixture and a change in the direction of its movement, the intensity of the effect on the material being processed increases, which leads to the destruction of agglomerates and accumulations of particles and thereby reduces the content of fine particles in the intermediate separation products . Distribution elements also prevent large particles from slipping into the separation channels located opposite the air supply nozzle. When installing distribution elements with the possibility of vertical movement and (or) rotation relative to their vertical axes, the accuracy of adjustment of values

0 the flow rate of the air mixture through the separation channels as compared to the adjustment by changing the size of the gap between the V-shaped discharge strips carried out in a known device. More precise adjustment improves the equilibrium distribution of the air mixture over the separation channels, thereby improving the separation accuracy especially for classifier structures having a large number of separation channels in the bags and the angle of opening of the diffuser part of the body.

0 in front of them more than 15 °.

Claims (2)

1. Pneumatic classifier for ed. with sv. No. 1438860, characterized in that, with In order to improve the quality of separation by optimizing the flow of the aerial mixture into the separation channels and intensifying the impact on the material being processed, it is equipped with distribution elements located under the V-shaped discharge strips with a gap and symmetrically relative to their vertices. 2. Classifier according to claim 1, characterized in that the distribution elements are installed with the possibility of vertical 5 movements and / or rotations relative to their vertical axes. eight -B 2