SU1232300A1 - Vibratory screen - Google Patents

Description

The invention relates to devices for the classification of bulk materials by size and can be used in the mining, metallurgical, chemical industries of the industry, mainly for separating thin classes from polydisperse material.

FIG. 1 is a schematic diagram of a screen with direct excitation of a screening surface; in fig. 2 - a fragment of the reflective surface, assembled from bundles; in fig. 3 — reflective surface made of an elastomer sheet; in fig. 4 and 5 - options for installing a reflective surface over a screen sieve.

The screen comprises a housing 1, in which a screening surface 2 made of a mesh cloth is inclined, vibrodrives 3 connected by means of rods 4 to a screening surface. In the upper part of the screen there is a power supply device 5, under the screening surface the casing has funnels 6 for collecting and discharging the undersize product, and from the bottom edge of the screening surface the screen is supplied with a chute 7 for discharging the superhigh product. Above the screening surface 2 there is a reflecting surface 8, which is fixed by its upper part in the housing, and by the lower part - in the fixture 9 for adjusting the distance to the screening surface.

The reflective surface is made in the form of a set of strings (bundles) of elastic material, such as rubber, polyurethane or other elastic polymeric materials, and has a different cross-sectional shape - round, rectangular, trapezoidal. The surface set 8 can be realized from individual round strings 10, fastened at the ends with strips 11 (Fig. 2) or connected by a vulcanization method.

The surface 8 is made of a flat elastomer sheet by making parallel cuts 12 therein, forming rectangular cross-section strings 10 (Fig. 3).

The reflecting surface 8 is mounted in a housing with tensioning the strings to control the operation of the screen. The tension of the strings can be achieved either by installing a tensioner 13 (Fig. 4), or by friction between the layers of material moving down the reflective surface, the bottom

part of which is freely placed on the screening surface.

Vibrating screen operates as follows.

The original polydisperse material is fed into the screen through the power supply device 5 and enters the screening surface 2, vibrating at a frequency and amplitude determined by the parameters of the vibration actuator 3.

The vibrations of the screening surface 2 are transmitted to the particles of the material and the latter make jump-like displacements on it, shifting simultaneously in the direction of inclination of the screening surface. Particles smaller than the size of the cells of the screening surface pass through it into the funnel 6 and are discharged from it. At the same time, the particles of the material meet up with the reflective surface 8, bounce off it and return to the screening surface. At the same time, a part of the largest particles, which have a greater supply of kinetic energy, fall on the boundary between the strings, push them away at the meeting point and penetrate into the space above the reflecting surface, then move along it. The oversize fraction, which does not pass into the cells of the screening surface, together with large particles transported over the reflecting surface, is removed through the chute 7 from the screen.

The amplitude of the spasmodic movements of the particles between the surfaces 2 and 8 is controlled by varying the distance between them using the tool 9. The amount of material particles penetrating the reflective surface is adjusted by the tension device 13.

When operating without tensioner 13, the reflective surface is stretched due to friction between the layers of material flowing into the drain 7 above this surface and between it and the screening surface. In the latter case, the tension is not great, but a tension device is not required.

Thus, the implementation of the reflective surface of the individual elements allows it to retain its reflective properties relative to the particles of medium size and small, but gives it the ability to select some of the largest particles from the layer on the screening surface, thereby relieving the load on the latter.

ten

F-5

Compiled by E. Papkova

Editor N. MargolinTechred I. VeresKorrektor I. Muska

Order 2493 / 8Discount 565Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (3)

1. VIBRATING SCREEN, comprising a vibrating drive, a housing, a screening surface inclined in the housing and a reflective elastic surface located above it, characterized in that, in order to increase the performance of the screen in classifying a polydisperse material, the reflective surface is made in the form of strings in contact with each other, installed along the longitudinal axis of the screen. 2. Rumble on π. 1, characterized in that the reflective surface is provided with a tensioning device. 3. Rumble on π. 1, characterized in that the upper part of the reflective surface is fixed above the screening surface, and the lower is freely placed on it.