SU1243836A1 - Screen for dehydrating materials - Google Patents

Description

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The invention relates to devices for the separation of materials and their dehydration.

The purpose of the invention is to increase the performance of the screen.

FIG. 1 shows a crash, general view, longitudinal section; FIG. 2 is a view A of FIG. one,

The screen consists of a vertical casing 1, a loading discharge and drain pipes 2.3 and 4. Inside the casing 1 there is a cylindrical spiral screening surface 5 and a conical screening surface 6. To hold the flow of granular material inside the conical screening surface 6 coaxially mounted with a screw surface 7, consisting of two parts: a horizontal initial coil 8 on the side of the loading pipe and a spiral helix 9. The horizontal initial coil 8 has a crescent-shaped front face 10, Mowing towards the helix axis 9 and found to schuyus over the junction of the horizontal primary coil helix 8 and 9.

The roar works as follows

The mixture of granular material with a liquid flows under pressure through the loading nozzle 2 onto a vertical spiral sieving surface 5. Under centrifugal force, the flow is evenly distributed over the cylindrical spiral sieving surface 5 and is classified. As they move along the surface 5, the largest and heaviest, and then the smaller, lighter grains, under the force of gravity, settle onto the horizontal coil 8 of the helical surface 7. Their speed decreases as compared with the speed of the mixture due to friction on the screening surface 5 and surface 7. Small sifted grains together with a liquid go to the sub-product, and the settled large

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the grains are mixed along the surface: 7 and fall onto the spiral part 9.

The liquid part of the mixture, retaining its initial circumferential speed on the cyanical spiral sieving surface 5, is removed from the surface of the coil 9 at the place of its decrease and is cut off by the sickle-shaped front edge 10. Cut off liquid

Part 0 is fed to the reprocessing on the u-linear surface 5 and, when mixed with the incoming mixture, promotes the entrainment of fine particles through the screening surface.

5 The settled portion of the mixture moves along helix 9 along a conic sieve surface 6 at a constant peripheral speed and is further classified and dehydrated. The oversize material loses a part of its volume due to the entrainment of water and small grains, therefore, the screw surface 7 is made of variable width, decreasing in the direction of discharge.

25 nozzle, with the width of each: the upper turn is two times smaller than the width of each lower turn.

Thus, the granular material classified on the screening

30 of the surface is divided by the front face of the horizontal-initial coil of the surface 8 into solid and liquid components. In this case, the liquid component is re-directed to

The upper part of the screening surface, jr, and the solid part of the flow, which has been in contact with the conical clean sifting surface for a long time, moving over surface 7, is additionally dehydrated and classified. Due to this, an additional extraction of small particles takes place: particles from the oversize product, and the abundance difficult to deposit.

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The present invention provides for a constant circumferential speed of the material, which contributes to the elevation of the screen performance.

Type A

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Claims (2)

1. SCREEN FOR DEWATERING MATERIALS, including a housing with a screening surface, inside which a screw surface is installed, a loading, unloading and drain pipe, characterized in that, in order to increase the performance of the screen, the screw surface is made in the form of a spiral with a horizontally located initial turn ' from the side of the loading pipe, while the front edge of the horizontal turn is made crescent. 2. A screen according to Claim. Characterized in that the width of the helical surface of the spiral is made decreasing towards the discharge pipe, and the width of each upper turn is two times less than the width SU „„ 1243836 Thebes1