SU109707A1 - Continuous air classifier - Google Patents

Description

Various types of air classifiers are known and used in industry for separating fine powders from milled materials.

The disadvantages of the existing types of air classifiers are the insufficient degree of separation of the classified material into fractions and the difficulty of tuning to the exact selection of only the specified fractions.

The proposed classifier gives repeated purging of the material, which provides a more complete separation of fine fractions from the source material.

FIG. 1 shows the classifier in three projections; in fig. 2 shows a section according to AA in FIG. 1. The classifier consists of /, having a trough-shaped bottom 2. A tube 5 is disposed along the chamber axis, having two rows of nozzles 4 arranged in a slider order.

The pipe is supported by bearings 5 and 6, mounted on the end walls of the chamber, and can rotate in them up to 90 °. The tube may have swinging movements, for which the outer plugged end of the tube is provided with a lever 7 connected by a connecting rod 8 to the crank of the pulley 9.

On the end wall of the chamber is installed a bunker 10, from which the source material enters the chamber along the chute. The flow of material into the chamber is controlled by a drum feeder.

A fan // is installed on the same end wall, the exhaust port of which is connected to the cyclone 13 by a pipe 12.

An outlet for removing air from the cyclone by the knee 14 is connected to the oscillating pipe 3.

In order to remove the coarse fraction from the classifier, there is a chute 15, fitted with a gate.

Classifier works as follows.

The material fed from the hopper along the chute falls on the bottom of the chamber under the oscillating pipes). The air escaping from the nozzle located above this material scatters the material and partially moves it along the bottom of the chamber. When the tube is rocked, the material again comes under the influence of the air jet from the nozzle passing above it and again partially moves along the chamber.

Thus, the material will gradually move towards the chute of the chamber and exit through it. Under the influence of air jets emerging from the nozzles, fine fractions are carried out of the material by air flow. The dusty air is sucked in by a toro fan and directed to the cyclone, a tone where most of the dust is trapped, and the partially dust-free air from the cyclone enters the rocking pipe and re-enters the cycle.

Thus, when the classifier is continuously fed with material, there is a continuous release of fine fractions from it. The size of the fractions produced depends on the air flow rate in the classifier chamber and can be changed by adjusting the fan speed.

Subject invention

A continuous air decimator equipped with a hopper with a drum feeder for the material and a catcher system in the form of a fan; , and a pipe with nozzles for supplying air to the material located at the bottom is mounted along its axis.

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FIG. 2

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