SU1176974A1 - Apparatus for classifying loose materials - Google Patents

Description

The invention relates to the technique of separation and sorting of bulk materials into fractions and can be used in the chemical industry and other sectors of the national economy in the separation of light polydisperse materials, such as polymeric.

The aim of the invention is to simplify and improve the reliability of the device in operation.

FIG. 1 shows the proposed device, a general view; in fig. 2 is a view A of FIG. one.

The device contains a screening surface, which is made in the form of strings 1, wound on pipes 2. The pipes have threaded grooves with a pitch depending on the size and number of fractions of the material to be scattered, while the grooves are made with variable pitch, which allows to obtain a screening surface with classification zones material into different fractions, the groove pitch being determined by the formula

1 = ό + Θ,

where ί is the groove pitch; ά - diameter of the string;

Θ - size (maximum permissible value) of a specific fraction of the material to be dispersed, a device for tensioning the strings, including a faceplate 3 with openings located along its perimeter, mounted on one side of the pipes 2 and a tapered ring 4 installed on the other side of the pipes 2 in front of them . In the faceplate 3 fixed sleeve 5, the holes in which are made with eccentricity.

The pipes are installed with the possibility

interaction with the sleeves 5 and the ring 4. The annular part of the pipe, mating with the tapered surface of the ring, is equipped with a self-locking nut 6. This embodiment of the tensioning device allows for preliminary and final tensioning of the strings. Turning the sleeve 5 in the holes of the faceplate 3, preload the pipes 2.

The string 1 in the form of, for example, steel wire with a diameter of 0.5 mm, is fixed with a free end in the faceplate. The shaft of the screw machine is rotated and, setting the optimum speed for winding the string, each turn of the string is successively laid in the grooves made on the pipes.

At the end of the winding, the second end of the string 1 is fixed at the junction of the pipe 2 with the ring 4. After that the sleeves 5 are turned to the maximum eccentricity value and the nuts 6 are tightly (up to the stop) connected to the spacer ring. Thus, the final guaranteed string tension is performed with the formation of a screening surface in the form of a truncated pyramid.

The device works as follows.

The material to be classified into appropriate fractions, such as high-pressure polyethylene, flows from the auger machine directly inside the proposed device onto its screening surface.

When the device rotates, the screening surface in the lower position makes a rotational motion, while the material is held on it to a certain angle corresponding to the angle of repose of the powder. Then the material begins to move the entire mass to the next facet of the screening surface, which occupies the lower position.

As a result of the periodic fall of the material from one face to another, microvibrations arise in the strings, which practically exclude the possibility of particles jamming between the strings and, consequently, the material sifting the sieving surface, which allows you to feed the material to a constantly free face of the sieving surface, making maximum use of its effective area.

1176974

Type A

Claims (1)

DEVICE FOR CLASSIFICATION OF BULK MATERIALS, including a string screening surface, a device for fastening strings, made in the form of pipes, on which strings are wound, and a device for string tension, characterized in that, in order to simplify and increase the reliability of the device in operation, the device for string tension is made in the form of a faceplate holes around the perimeter and a tapered ring, installed in thrust from one end of the pipes, while the other ends of the pipes are installed in the holes of the faceplate with the aid of bushings with eccentric holes. 05 WITH "H W ^ -dd—> 1 I176974