SU1666228A1 - Air classifier - Google Patents

Abstract

This invention relates to the pneumatic classification of various bulk materials in an upstream air flow. The goal is to improve the quality of separation. The upper part of the body 1 of the classifier is divided into separation channels (K) 2. Inclined under K 2 is the lattice 3. At the upper and lower edges of the lattice 3 there are placed, respectively, the loading 4 and the unloading 5 nozzles. On the grid 3, perpendicular to its plane, plates 8 are installed in two rows on either side of the longitudinal axis of the grid 3. Each plate 8 is fixed on the vertical axis 7 with the possibility of rotation around it. The source material is supplied by the feeder 6 through the nozzle 4 to the upper edge of the lattice 3. On its surface, separation into large and small fractions occurs. Under each K 2, due to the rotation of the axes 7 and the plates 8 fixed on them, the flow of material is formed and the cost ratios are adjusted with different concentrations of material. 2 Il.

Description

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This invention relates to the pneumatic classification of various bulk materials in an upstream air flow.

The purpose of the invention is to increase the quality of separation.

1 shows a pneumatic classifier; figure 2 - view And figure 1.

The classifier includes a housing 1, divided in the upper part into separation channels 2 and limited by side walls, an inclined grid 3 installed in the lower part of the housing, loading 4 and unloading 5 nozzles, respectively, for supplying the starting material and discharging the coarse separation product , axis 7 with plates 8 fixed on them, axis 7 of communication with the grid is pivotally connected to levers 9. The lower edge of the plates 8 lies in the plane of the grid 3. Valves 10 serve to adjust the air flow rate in each channel 2; 11 - bunker of a small product; 12 - cyclone for separating the fine product from the air; 13 - suction nozzle of the fan 14.

The operation of the pneumatic classifier is carried out as follows.

The original material is fed by the feeder 6 (Fig. 1) through the loading nozzle 4 to the upper edge of the lattice 3. At the same time, fluidization and creation of a fluidized bed of the material occur on its surface, begins under the action of resistance forces and weighs its division into large and small ones. fractions. Small fractions due to the air flow generated by the fan 14 are carried to cyclone 12, where they are separated from the air and fed to the bunker 11 of the fine product. By means of the valves 10, the speeds of the upward air flow in each section of the steam duct 2 are adjusted. The regulation is carried out in such a way that the speed of the upward flow in all the shafts is the same.

The purified air from the cyclone 12 enters the suction inlet 13 of the fan 14. The coarse fractions moving along the inclined grate are freed from the fine particles in the fluidized bed and then discharged through the nozzle 5. As the material moves along the inclined

the grid under each separation channel 2 is carried out by means of levers 9 by rotating the axes 7 and the plates 8 fixed to them 8 to form a material flow. As under the first channels, a part of the lattice surface area enclosed between the plates 8 and occupied by a dense layer of boiling material, which is less than the surface area of the lattice between the plates 8 and the side walls 15 of the housing 1, this is part of the lattice 3 relatively free of material and through it into the separation channel 2 enters the air with a lower concentration of the material than through part of the surface of the lattice enclosed between the plates 8.

Claims (1)

Thus, due to the rotation of the axes, the cost ratios with different material concentrations are adjusted. In the region of the last channels 2, which are usually underloaded in analogues, the grid area between the plates 8 is larger than under the first channels. This means that air with a greater concentration of material enters the last channels. In this way, the exact concentration of the particles in each separation channel is finely adjusted. Such adjustment allows to level the negative effect of fluctuations in the particle size distribution of the starting material, to ensure separation in each separation channel along the same separation boundary and thereby improve the quality of separation by 5-10%. Pneumatic classifier, comprising a housing, the upper part of which is divided into separation channels, a grating located obliquely under the separation channels, loading and unloading nozzles located respectively at the upper and lower edges of the grating, characterized in that provided with plates installed on the lattice perpendicular to the plane of the latter, with the possibility of rotation of each plate around the vertical axis of fixation, with the plates being placed us in the two rows on either side of the longitudinal axis of the lattice. 15  / I I  T 159 FIG. 2 Vida