SU1232298A1 - Screen - Google Patents

Description

The invention relates to devices for screening rock mass and can be used in the process of crushing and screening operations.

The purpose of the invention is to increase the specific productivity of the screen in the separation of dolomitized sandstone.

FIG. 1 shows a screen, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 - grate, longitudinal section; in fig. 4 shows a section BB in FIG. 3

The screen contains frame 1, a lattice drum 2 mounted in bearings, a loading tray 3, discharge chutes 4 and 5, respectively, for oversize and undersize products, the latter having the shape of a hopper and fixed under the lattice drum to frame 1. The lattice drum is formed by end rings 6 and the grate 7, installed at an angle to the axis of the drum, the actuator 8 is connected to the drum through the crown gear 9. The grate bars are made in the form of a prism, one of the faces of which is located in the horizontal plane, and the other two comfort with it in cross section is an isosceles triangle whose height decreases from the middle of the grate length to its ends, and the height reduction is determined by the formula

H ,, Li

0

j 0

five

0

where Poison (is the current ordinate of the top of the working part of the grate; D is the width of the shell between the grates, mm;

L is the length of the grate, mm; AL is the current abscissa of the top of the working part of the grate, mm. The proposed rumble works as follows.

The lattice drum is driven by the actuator 8 by means of the crown gear 9. The material from the loading tray 3 falls on the grate 7 and when the drum turns, it moves in the direction of its rotation by an angle equal to the angle of repose of the material, goes down and goes into the undersize the product to the discharge chute 5. The oversize product is mixed by the transport shelves 10 along the axis of the drum and, by means of the discharge vanes 11, is led out of the working area to the discharge chute 4. Along with the screening process occurs also the process of selective grinding. The remaining grazing material is picked up by the transport shelves 10 and rises to a certain height, from which it then falls on the grate 7, as a result of which the soft component of the grazing material is crushed on the upper part of the working surface of the grate and goes unhindered to the under-sieve, without clogging grates, which is due to the choice of a certain form of grates.

ten

(rig.

Editor N. Margolin Order 2493/8

VNIIPI USSR State Committee

for inventions and discoveries

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

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

Compiled by E. Papkova

Tehred I. Veres Corrector A. Ferenc

Circulation 565 Subscription

Claims (1)

SCREEN, containing loading and unloading trays, a trellis drum formed by end rings and grates installed at an angle to the longitudinal axis of the drum, and a drive, characterized in that, in order to increase the separation of dolomitic sandstone, the working part of each grate is made in the form of a prism, one of the faces of which is located in the horizontal plane, and the other two form with it in cross section an isosceles triangle with a height that decreases from the middle of the length of the grate to its ends in accordance and with the formula / Λ _ζ = 1,5Ώ ^ ΔΔ, where Nm is the current ordinate of the top of the working part of the grate; D is the width of the gap between the grates, mm; L is the length of the grate, mm; ΔΖ. —Current abscissa of the vertex of the working figure 1 SU „„ 1232298