SU845875A1 - Vibration screen - Google Patents

Description

(54) VIBRATION SCREENING

I

The invention relates to devices for the separation of bulk materials by size and can be used in the mining industry, construction and other industries.

Known vibrating screens, have, and working bodies, made in the form of various types of sieves, such as sieves, grates, perforated sheet. The raw material, mixed in a vibrating sieve, is divided into sub-sieve and sublattice classes 1.

The disadvantages of these screens, which reduce their efficiency, performance and durability, are that the material is unevenly distributed across the width of the sieve, particles of large and small fractions of the material falling on the surface of the sieve are cracked, resulting in large particles making it difficult for small particles to pass through the holes. screening and thus reducing the productivity of the screening process; large particles of material pass along the entire length of the screen surface and cause increased wear.

A vibrating screen is also known, in which an additional distribution grid is installed over the sieve,

This allows the material to be evenly distributed on the surface of the sieve 2.

The disadvantage of this screen is low productivity, due to (

This is due to the fact that large particles impede the passage of small particles with additional

go sieve on a sieve.

The purpose of the invention is to increase the productivity of screening.

The goal is achieved by

Q of what apertures in distribution

a) the grid is made with successively uve. flow sizes from the beginning to the discharge end of the sieve.

In addition, in order to control the distribution of small and large particles m:

material along the length of the sieve, the distributor and the lattice is fixed with the possibility of a angle of inclination of its surface relative to the sieve.

Claims (2)

At the same time, the mechanism for changing the angle of the barrel 20 consists of racks and screw fasteners. FIG. 1 shows a vibrating screen, a general view; in fig. 2 - the same, 1id from above. The screen contains base 1, elastic elements 2, vibration exciter 3, sieve 4 and distribution grid 5 fixed above the sieve. Distribution grid fed over the sieve to racks 6 with screw clamps 7. The racks contain slots dl. changing the angle of inclination of the lattice relative to the surface of the sieve. The distribution grid is made, for example, in the form of a perforated sheet with successively enlarging, with the dimensions of the bore holes in the direction towards the discharge end of the light. The dimensions of the distribution grid are chosen in width within the width of the sieve, and in length within 0.5 to 1.0 of its length. The passage dimensions of the holes in the distribution grid are selected depending on the size of the material to be sorted. At the same time, the minimum passage size of the holes is selected within 0.5-2 of the size of the screen openings. The roar works as follows. The source material is fed to the beginning of the distribution grid 5. As the material moves along the surface of the distribution grid, particles that are smaller than the dimensions of the through-holes of the grid are fed to the surface of the sieve 4. Moreover, smaller fractions will fall closer to the beginning of the sieve, and larger ones closer to the discharge end Sveta. Therefore, larger particles of material are on top of smaller particles that have not yet passed through the sieve holes, and to a much lesser extent prevent the passage of small particles. Moreover, small particles experience shock and pressure from larger particles on top of them, which also increases the efficiency and efficiency of screening. The distribution grid can also be made in the form of a strip duct with fan-like diverging rods along the working surface of the sieve. The width of the slit holes between the rods increases from the beginning of the screen to its discharge end. Using the proposed screen allows to increase the productivity and efficiency of vibration classification of bulk materials. Claim 1. Vibrating screen comprising a sieve, a distributor grill mounted above the sieve, and a vibrator, characterized in that, in order to improve screening performance, the holes in the distributor grid are made with successively increasing sizes from the loading end to the unloading one. 2. A screen according to claim 1, characterized in that, in order to control the distribution of the material in a sieve, the distribution grid is provided with a mechanism for changing the angle of inclination. 3. Screen according to claim 2, characterized in that the mechanism for changing the angle of inclination consists of racks and screw clamps. Sources of information taken into account in the examination 1. Streamer machines. Directory. Ed. V.A. Bauman and F.A. Lapira, vol. 1, M., “Mashinostroenie, 1976, p. 369. 2. USSR author's certificate number 674803, cl. B 07 B 1/42, 1975 (prototype).