SU410827A1 - Method of screening bulk materials on inter-moving grate - Google Patents

Description

one

The invention relates to a method for the screening of bulk materials on reciprocating grates and can be used in the building materials industry, in the beneficiation of minerals and other national households.

There is a known method of screening bulk materials on mutually reversing 1. a1O1cichs grates of rectangular section with the use of their oscillations relative to each other in a plane perpendicular to the screening surface.

The aim of the invention is to increase the efficiency of self-cleaning and reduce wear of the grates.

For this, according to the proposed method, the grates are reported with additional oscillations in the transverse direction synchronously with the vibrations of the grates in the vertical plane.

The indicated nature of additional oscillations of the grate ensures that the size of the gap between the grate remains constant and causes the vibrational movement of the part through the slots, which is directed on average. The addition of oscillations of the grates relative to each other in a vertical plane perpendicular to the sieving surface, and additional oscillations in the direction transverse to the grate in the plane of the screening surface causes the material that falls into the space between the two grate to receive alternate pushes directed at an angle down to the surface of the grate, to the left and to the right, and transferred from the wall of one grate down to the wall of the other grate and transported through the gap between olosnikami.

FIG. Figures 1-4 show a schematic diagram of the movement of two adjacent grid-irons, forming a working slot, and their effect on a particle; in fig. 5-8 is a schematic diagram of the designs of screens that implement the proposed method.

FIG. Figure 1 shows the cross-section of the grates, the displacement of which is determined by equal vectors AB and EF. At the same time, the modulus and phase shift of the displacement vectors of neighboring grid bars are such that the projections of the grid bars move to the screening plane at each moment of time are the same, i.e. AC KE. The equality of these projections of movements means that the size of the gap between the grate remains unchanged. In this case, the phase shift of the projections of the displacement of the grates onto the vertical plane is 180 °, i.e. AD -EL.

The impact of both sides of the colospic on the material is different. If one side tends to push a piece of material.

got into the slot, down, then the second side - up. Therefore, in one group of slits formed by the working sides of the grate, the material is forcedly pushed through the slit as it is thrown from one side to the other.

FIG. Figure 2 shows the four phases of the grate movement and the velocity vectors. Phases I and III illustrate the passage through neutral positions with the highest speeds, while phases II and IV illustrate stops at the extreme positions. FIG. 3 shows the effect of the slit walls on a piece of screened material.

FIG. Figure 4 shows the action of inertial forces acting on a piece that has been partially submerged in a working slot formed by two grate bars moving, as shown in FIG. 1 and 2. Arrow A shows the direction of horizontal movement of the cell walls.

FIG. Figure 5 shows a schematic diagram of an inertial screen with mutually moving grate and self-synchronizing vibrators. The drive forces passing through the centers of gravity of the masses are in parallel planes perpendicular to the vertical plane of the longitudinal symmetry of the screen, and are directed symmetrically to this plane at equal angles to the screening surface. The necessary force phasing of the drives is achieved by a synchronizing flexible shaft connecting one of the shafts of each drive.

FIG. Figure 6 shows a schematic diagram of a screen with reciprocating grate with one, for example, a mechanical vibrator. Equal masses of the grate participate simultaneously in two movements: portable, together with the hull, and relative, caused by the deflection of the springs. System completely

dynamically balanced and driven by a single vibrator due to the use of elastic guides.

FIG. Figure 7 shows a screen with mutually moving grates and an electromagnetic drive. The system is dynamically balanced, since the horizontal components of displacements, speeds and accelerations of equal groups of grates in each system of grates are always mutually opposite, and the components acting in a vertical plane are balanced by an electromagnetic drive operating in a resonant mode.

FIG. 8 shows the screen of mutually moving grates and a crank vibrator having one shaft and two groups of connecting rods set at an angle of less than 180 ° to each other and connected to

grate one and another system.

The proposed method creates a positive effect consisting in a faster and more efficient passage of all stages of screening.

Claims (1)

Invention Formula The method of screening bulk materials on mutually moving grate rectangular section using their vibrations relative to each other in a plane perpendicular to the screening surface, characterized in that, in order to increase the self-cleaning efficiency and reduce the wear of the grate, the latter are additionally reported to oscillate in the transverse direction synchronously with oscillations of grates in a vertical plane. uccucci , x N s . 1E; fc I u 77 410827