SU1570791A1 - Screen - Google Patents

Abstract

BACKGROUND OF THE INVENTION The invention relates to the separation by size of bulk particulate materials, and b. applied in the mining and coal industries. The goal is to increase the efficiency of screening. The screen contains a loading device and several consecutively inclined grate under it. Grate bars / K / gratings are fan-shaped. The loading ends K 4 are fixed on the straight plates 5. The discharge ends K 4 of the first off-grid grille in its cross section are arranged along an arc, convex upwards and located symmetrically with respect to the longitudinal axis of the screen. The arched arrangement of K 4 is provided by differently sized legs 6, by which K 4 is supported on the transverse bar 7. Due to the convexity of the first grid, the material supplied to the screen is distributed on the width of the grids in a uniform layer. In this case, part of the material moves at an angle to the longitudinal axis of the screen, increasing the path of passage along its gratings. 2 Il.

Description

FIG. 2

The invention relates to a device for the separation of the bulk of bulk materials and can be applied in the porno-ore and coal industries.

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

FIG. 1 shows the proposed screen; in fig. 2 - the first grate of the screen, axonometric projection (arrows indicate the direction of movement of the material).

The screen contains several successively installed inclined grates 1-3, which are installed in such a way that the end of each of them, except the last one, rests on the beginning of the next grid. Grate 4 grates are fan-shaped. In this case, the ends of the grates of the first lattice 1, facing the loading side, are located along one straight line and fixed on the bar 5, and their opposite ends, in cross section of the lattice 1, are located along an arc convex toward the superlattice fraction. The arcuate arrangement of the grates is provided by differently sized stands 6, by means of which the grate 4 is supported on the transverse bar 7. The stand of the largest size is mounted on the longitudinal axis of the screen. The width B of the grill 1 at the entrance is determined by the size of the width of the belt of the loading device (conveyor) 8.

The roar works as follows. Bulk material from the conveyor 8 falls on the grate 1. Due to the convexity of the surface of the grate

1, the bulk material begins to "flow along this lattice (the directions are shown by arrows), and the height of the layer of material along the entire screening surface of the grate 1 becomes uniform. In a uniform layer of height, the material is successively supplied to the grids 2 and 3 of the screen, the efficiency of screening is increased. In addition, the material on grid 1 moves not only along the axis of the screen, but also at an angle to it.

At the same time, the path of movement of a part of the material flow is increased, which also contributes to the efficiency of screening.

Claims (1)

Invention Formula The screen contains several inclined grate grates installed under the boot fixture with a fan-shaped arrangement of the grates, the loading ends of which are fixed to rectilinear slats, characterized in that, to increase the efficiency of screening, the discharge grates of the first grate from the loading fixture are located in its cross section along the arc, convex upwards and located symmetrically with respect to the longitudinal axis of the rumble.