SU1072925A1 - Screen - Google Patents

Abstract

THROTTLE, including a housing, sifting the surface in the form of concentric horizontally mounted rings with cantilever fan-shaped grid bars that are mounted on various rings, and a drive that is different in order to improve the quality of screening on the rotating screening surface and to improve the self-cleaning of the latter by increasing the degree the mobility of adjacent grate relative to each other, the screen is equipped with rollers, which are installed under the grate concentric to the rings with the possibility of tanovochnogo movement in a vertical plane, the grating bars are made of different-sized, and the grooves formed in the rings grate fixation. (L N3 SO YOU ARE

Description

The invention relates to the mining industry, in particular, to devices for classifying materials by size class.

A screen is known which includes a housing, a rotating conical screening surface with spoke-shaped grate, a loading nozzle and a discharge chute 1.

However, due to the smooth working surface of the screen, the vertical component of the material movement is small, which reduces the intensity of the mixing of the material and, consequently, the classification efficiency.

Closest to the proposed technical essence and the achieved result is a roar that includes a housing, a screening surface in the form of concentric horizontally mounted rings with cantilever fan-shaped grid-irons, which are fixed on different rings, and an actuator 2.

However, due to the insignificant mobility of adjacent grates relative to each other, the likelihood of clogging of the sieving gaps remains quite large, which leads to the ingress of small classes into the above-grate product and a decrease in the quality of screening.

The purpose of the invention is to improve the quality of screening on a rotating screening surface and to improve the self-cleaning of the latter by increasing the mobility of adjacent grate relative to each other.

The goal is achieved by the fact that the screen includes a body, screening the surface in the form of concentric horizontally mounted rings with cantilever fan-shaped grid bars that are mounted on different rings, and the drive is equipped with rollers that are mounted under the grid bars concentric to the rings with the possibility of installation movement in the vertical plane , the grate bars are made of different sizes; in the rings there are grooves for fixing the grate bars.

FIG. 1 shows the proposed screen, cut; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one; in fig. 5 is a section of YYD in FIG. one; in fig. 6 is a section d-d in FIG. five.

The screen consists of a body 1, a rotating screening surface 2, nozzles 3, a drive 4 and a cantilever, long 5 and short 6 grate free-lying hingedly fixed (Fig. 2), coaxially mounted horizontal rings: internal. and outer 8 with grooves 9 fixation of grates (Fig. 4 and 5), nests 10, made in the form of through holes, dimensions

and the shape of which is coordinated with the cross-section of the spikes, concentrically located at a certain distance from each other under the grate 5 and 6 of the rollers 11, the upper contour 12 of which is higher than the level of the base 13 of the grate (Fig. 3), the brackets 14 with the mechanism for their vertical mixing, made in the form of a screw pair of 15 or a series of matched holes 16, which are bolted 17

0 with the housing 1. When the screening surface rotates, each grate 5. And 6, rolling on the rollers 11, alternately forms a moving screening surface in the form of traveling waves.

The grate is fixed to the rings by means of the fastening element 18. The taper of the screening surface 2 is selected from 170 to 150 °, depending on the frequency of rotation of the screening surface.

Q The slits of the screening surface 2 are widened, as the angular velocity of the grate 5 and 6 increases with distance from the center (i.e., the effective cross-section of the screening decreases), and the speed of the material passing through the slits

5 between the grate bars remains practically unchanged, since the screening time of the material on the peripheral areas of the screening rotating surface 2 is shorter.

The operation of the screen is as follows.

The source bulk material of any moisture enters the center of the rotating screening surface 2 and is uniformly distributed over the conical surface formed by the grate 5 and 6.

Under the influence of centrifugal forces, with the rotation of the surface 2 and the angle of its taper (determined for each material practically), the material begins to move from the center to the periphery. The passage through the grates 6 and 5, particles smaller than the slit of the screening surface pass into the sub-pit space, and the larger ones are dropped from the grate.

5 When rolling the grates 5 and b along the rollers I, a continuous moving screening surface in the form of traveling waves is formed.

The wave height is controlled by the vertical movement of the brackets 14 relative to the base 13 of the grate 5 and 6 (Fig. 2 and 3). The distance between the waves depends on the distance of the rollers 11 from each other. The narrowing of the gaps between the grate 5 and 6 is prevented by the locks 9 of the ring 8, which limit the displacement of each grate in three planes: down, right and left (Fig. 4), except for the vertical movement.

The ring 7 (inner) has fixing grooves 9 and recesses 10 for fixing the grates 6 (short) by means of the fixing element 18 (Fig. 6).

The amplitude of the vertical movement of the grate 5 and 6 depends on the location of the rollers 11 along the radius and the length of the cantilevers of different-sized grate 5 and 6.

When using the proposed invention, besides improving the cleaning of the screening surface, it is possible by matching the rotational speed with the degree of increasing the size of the gap to the periphery to allocate a fraction of a certain constant size into the sub-product and vary the effective cross-section of the sieving.

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Claims (1)

SCREENING, including a housing, a screening surface in the form of concentric horizontally mounted rings with cantilever fan-shaped grates that are mounted on different rings, and a drive, characterized in that, in order to improve the quality of screening on a rotating screening surface and improve self-cleaning of the latter due to increase the degree of mobility of adjacent grates relative to each other, the screen is equipped with rollers, which are installed under the grates concentrically to the rings with the possibility of Full-time movement in the vertical plane, the grating bars are made of different-sized, and the grooves formed in the rings grate fixation. '' S SU „„ 1072925