SU1207514A1 - Screen - Google Patents

Description

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The invention relates to a device for screening and dewatering bulk materials and can be used in the mining industry and in other areas of the national economy.

The purpose of the invention is to reduce energy consumption.

FIG. 1 shows a crash, longitudinal section; in fig. 2 - crash, top view.

The screen comprises a housing 1 with loading 2 and unloading 3 trays, a screening surface consisting of cascaded console grids 4, 5 and 6, a pallet 7 with a discharge opening

The cantilever grids are assembled from longitudinal grates 9 arranged parallel or fanlike and rigidly fixed with the possibility of swinging in the longitudinal plane on horizontal axes 10, at the ends of which two shoulders are rigidly fixed levers 11, aligned with the plane of the corresponding grate rods and pivotally connected by rods 12 with levers 11 adjacent grates. On the free shoulders of the levers 13, mounted on the axis of the upper grate 4, counterweights 14 are fixed. Under the action of counterweights 14, each odd grate, starting from the top, is set at an angle of inclination to the horizon, smaller than the friction angle, and every even-numbered at an angle of inclination to horizon, larger than the friction angle of the rattling material. The stops 15 and 16 are attached with the possibility of movement (for example, a screw) to the housing 1 and limit the angle of rotation of the levers 13 of the upper grate 4 around the axis 10,

The stop 15 fixes the position of the lever 13 with the counterweight 14, in which the inclination angle oL of the grille to the horizon is less than the friction angle, while the material on the grille is fixed

The angle of inclination of the grid lattice, at which the free movement of the material along the lattice under the action of its weight alone, is fixed by the stop 16. The position of the stops and counterweights is adjusted depending on the physical properties of the screened material. Friction angle depends on friction coefficient

142

material. Starting from the average value of the coefficient of friction of the ground on steel, 0.5, the angle of friction is 26 °, 5, Accordingly, the angle oi of the inclination of the lattice is smaller, and the angle d-i is greater than this value.

The roar works as follows

In the initial position under the action of counterweights 1A, the grate 4 will take a position at an angle, lattice 5 - at an angle d and lattice 6 - at an angle,

The source material through loading tray 2 enters the body 1 and begins to accumulate on the upper grate 4,

During accumulation, a portion of the water and material smaller than the size of the gap between the grate leaves. In the pallet 7. After accumulating a certain amount of material sufficient to overcome the weight of the counterweights 14, the grill 4 will rotate and take a position at an angle ot ,. Bladear tam 12 simultaneously lattices 5 and 6 are turned, set to the position at angles with and -i, respectively.

Due to the impact of the levers 13 with the counterweight 14 against the stop 16 and the increased inclination of the lattice 4, the material will be transferred from it to the lattice 5, the inclination angle of which is less than the friction angle of the material. During the movement, a part of the fine material will fall through the slits of the grill 4, and the remaining material will be retained on the grill 5, thus contributing to the additional dewatering of the material.

Thereafter, under the action of the mass of the counterweights 14 and the mass of the material on the grid 5, all the grids are returned to the initial position. At the same time, the material from the grid 5 will be transferred to the grid 6, the processes of dehydration and screening of the material will be repeated, and the material on the grid 4 will again accumulate. When its mass exceeds the mass of counterweights, all the grids will rotate again and the material from grid 4 will move to grid 5, and from grid 6 to discharge flow 3,

The number of cantilever grids is determined depending on the required total length of the screen,

During the operation of the screen, using the energy of the moving source material and counterweights, the cantilever grids rotate

but return movements. The amplitudes of oscillations of even and odd lattices at each given moment of time are equal and opposite in direction.

Material drops from the grid to the grid and shaking movements

grate bars due to the impact of levers on restrictive stops improve the processes of dewatering and screening of material smaller than the size of the sieve slit and facilitate the cleaning of sieves from stuck material grains.

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Figg

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Compiled by E. Papkova Editor N, Dolinich Tehred Z.Kastelevich Proofreader T.

Order 83/6 Circulation 566 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

Srig. 2

Claims (1)

SCREWER, comprising a housing, a screening surface in the form of cascade gantry cantilever mounted on the horizontal axes of the grate grids, levers mounted on the ends of the horizontal axes and pivotally connected to rods, characterized in that, in order to reduce energy consumption, the housing is equipped with stops and levers made of two shoulders and combined with the plane of the corresponding grate, and the arms of the levers located on the side of the respective grates are connected with the shoulders of the levers located with the opposite side of adjacent respective grids, while the free shoulders of the levers fixed on the axis of the upper grate are equipped with counterweights and are installed with the possibility of interaction with stops. ω s 207514