SU889148A2 - Pneumatic separating apparatus - Google Patents

Description

(54) PNEUMATIC UNIT

I

The invention relates to agricultural machinery and can be used in machines for cleaning seeds.

According to the main author. St. No. 465228, a pneumatic separating device is known, including an inclined cylinder, inside which a scattering device is installed, and blades, which in the cross section have the shape of an arc and are mounted on the inner surface so that its convexity is turned in the direction of rotation of the cylinder. A fan is installed at the end of the cylinder, which serves to suck air from the internal cavity 1.

The disadvantages of this device are low separation efficiency. When the material enters less than is necessary to fully load the cylinder blades, they lift it first without scattering (the pile is in deep pockets, as it were) and only in the upper position in a small area does it drop down. As a result of this dissipation, part of the cylinder space remains unfilled in a pile and the air flow passes mainly in this part free from the pile. And in the zone where the heap is dissipated, the air flow rate decreases, as a result of which the blowing of light impurities worsens.

The purpose of the invention is to increase the separation efficiency by uniformly distributing the material over the cross section of the cylinder.

The goal is achieved by the fact that the blades are made curved along a helical line relative to the line of attachment to the cylinder.

The fabrication of such blades allows the heap to be distributed more evenly over the cross section of the cylinder with varying loading of the blades. This is due to the fact that at the entrance of the pile (from the fan side) the angle between the surfaces of the blade and the cylinder in the plane perpendicular to its axis is the smallest, therefore the material rises with the blades as in a pocket to the highest position and disperses from a greater height mainly filling the space on the side of lowering the blades (left side of the cylinder section). As the pile moves toward the exit from the cylinder, its discharge from the blades begins accordingly earlier, since the angle between the surface

the blades and the cylinder increases and conditions are created for the earlier removal of particles from the bearing surface of the blades. At the same time, the scattering zone of the pile is shifted toward the rising blades (to the right), closing the entire section of the cylinder to the exit.

The drawing shows the proposed device.

Pneumo-separating device contains fan 1, loading tray 2, inclined cylinder 3 and fixed to the inner surface of the cylinder of the blade 4.

The device works as follows.

The pile is fed through tray 2 to the inside of the rotating cylinder 3, where it is picked up by the blades 4, repeatedly lifted up and scattered over the cross section of the cylinder. The airflow created by the fan 1 blows the falling-heap and carries away light impurities. Seeds and heavy impurities,

repeatedly dumped from the blades, out of the cylinder to the outside due to its inclination. The use of a pneumo-separating device makes it possible to increase the separation efficiency, the degree of emission of light impurities.

Claims (1)

Invention Formula Pneumatic separating device according to ed. St. No. 465228, characterized in that, in order to increase the separation efficiency due to uniform distribution of the material over the cross section of the cylinder, the blades are made. curved along a helical line relative to the line of fastening them to the cylinder. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 465228, cl. In 07 In 4/06, 1973 (prototype).