SU1572714A1 - Pneumatic classifier - Google Patents

Abstract

In order to improve the quality of material classification when changing its moisture content by adjusting the material dispersion mode on the louvered grid, the gas flow controllers are made in the form of rods installed between the louvre grid plates with a gap and with the possibility of autonomous reciprocating movement parallel to these plates. The rods are connected in blocks and are connected with a mechanism for changing their position with the possibility of autonomous movement of each block. 1 hp f-ly, 3 ill.

Description

The invention relates to the pneumatic classification of various bulk materials in an upward air flow and is intended to separate materials of a size of no more than 0 mm into two products with a boundary grain of 5-0.02 mm.

The aim of the invention is to improve the quality of the classification of a material by changing its moisture content by adjusting the dispersion of the material on the grid.

FIG. 1 shows the proposed pneumatic classifier; in FIG. 2 — node I in FIG. one; in FIG. 3 is a diagram of the connection of the gravitational

classifier with cyclone, filter and fan.

The pneumatic classifier 1 consists of a body with a number of parallel vertical shafts 2 installed above the inclined louvered grill 3, between the plates 4 of which are installed with a gap and with the possibility of reciprocating movement of the gas flow regulators 5, made in the form of rods. Under each vertical shaft 2 rods. 5 are connected in blocks 6, which by means of lever mechanisms 7 of movement are connected by handles 8 of the control with a mechanism for changing the position of the regulators 5. Under the louver 3, there is a gas supply chamber with a branch pipe 9. In the upper part of the lattice there is a branch pipe 10 days of supply the product, at the bottom - pipes And for bringing a large product into the hopper 12. The installation is equipped with a feeder 13 of the source material, a cyclone 14, a filter 15, a fan 16.

Classifier works as follows.

The source material is fed by the feeder 13 through the nozzle 10 to the louvre grill 3. Air passing through the grill acts on the layer of material on it. The force of air on a material depends on the adhesion of the particles of the material, which depends on the humidity. The force of the air blown through the grating on the material on it is determined by the speed of the air entering the material layer. Thus, the velocity of the air acting on the material on the grid is determined by the humidity of the material. The air passing through the grating loosens the layer of material on it, destroys the conglomerate of particles and creates a suspended layer of material that rolls down the grate 3.

For a certain moisture content of the material, there exists a certain (optimal) speed of exposure to air (dispersion mode). The inconsistency of these parameters reduces the quality of material separation. If the velocity of the air on the material located on the lattice is more than optimal, then the entrainment of particles of material into the mines of the classifier increases. the concentration of the material in the mines changes, and as a result, the size of the boundary separation grain changes, i.e. the classifier works in the specified mode.

Setting the optimal speed is made by moving the adjusters 5 through the channels between the plates 4 of the louvered grille 3. The rods are moved by means of the control knob 8 and the moving mechanisms 7. When moving the rod through the channel formed by the louvre plates, the front of the outflow of air moves

a smaller living section into the channel of the larger living section. At constant flow, the air velocity is inversely proportional to the cross section. The air in the channels between the plates of the lattice and the rod has a greater speed than in the channel formed only by the plates of the lattice. After the rod, the speed JQ does not decrease immediately, but after a certain distance (it is known from aerodynamics that this distance is 5-6 times the diameter of the larger channel). Moving the rod a distance equal to L 5-6 diameters from the surface of the lattice in contact with the material, smoothly regulate the velocity of the air on the layer of material on the lattice. When the rod is 2Q at the surface of the lattice with the material in contact with it, the air velocity is maximal and equal to the velocity in the channel between the fairing and the louvre grille plates. When the rod is at a distance of 5-6 diameters from the surface of the lattice in contact with the material, the speed is minimal and equal to the air velocity in the channel between the louvre plates. At the same time, moving the rods to the appropriate position does not change the speed of the upward flow in the apparatus’s shafts (separation mode), since moving the rods does not change the total hydraulic resistance 3 of the apparatus, and therefore, the air flow rate is maintained.

With fluctuations in the humidity of the incoming source material, the position of the rods in the slits of the louvre grille changes accordingly. The material fed to the louvre creates an uneven hydraulic resistance for the passage -.,. through the air grid. As a result, the ablation of particles of material in the mines is uneven. In order to equalize the concentration of entrained particles in the mines, under each shaft, the rod blocks 6 have an individual movement mechanism 7 with a control handle 8. To the position of the rods under this shaft, a certain moisture content necessary for dispersing the incoming material is added a correction correction for the entrainment of particles into the mine and the necessary dispersion rate of the source material is provided.

Editor I. Gorna

Compiled by O. Popov Tehred M. Khodiich Proofreader, Cherni

Order 1606

Circulation 524

Subscription

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5

Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101

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Claims (2)

1. PNEUMATIC CLASSIFIER, comprising a housing with loading and unloading nozzles, a louvred louvre grille with gas flow regulators and a mechanism for changing their position ’, a chamber 2 gas supply under the louvre grille, characterized in that, in order to improve the quality of the classification of the material when its humidity changes due to the regulation of the dispersion mode of the material on the louvre grille, the gas flow regulators are made in the form of rods installed between the plates of the louvre grille with a gap and with the possibility autonomous reciprocating movement parallel to these plates. 2. Classifier by π. 1, which consists in the fact that the rods are connected in blocks and are connected with a mechanism for changing their position with the possibility of autonomous movement of each block.