SU673327A1 - Slit screen - Google Patents

Description

(54) CRASH

;. I., .. The invention relates to the field of technology for the separation of bulk materials into fractions by particle size and can be used in the chemical, agricultural, mining industry.

A device is known that includes a frame with vertically mounted cheeks on which surfaces facing each other are protruding elements in pairs, forming stepwise decreasing slopes from top to bottom {(}. Protruding elements are shelves on which sheets are loosely laid. On them, vibrators Slit, formed by the edges of each pair of sheets, are set to such a width that, in general, they form a calibrating tapering downward slit. Each slot is made with a slight expansion towards the slope.

Sortable material is fed to the top pair of sheets. When the vibrators are turned on, the individual material, the size of which is greater than the width of the slits, moves along the sheets in the direction of their slope, and, having reached the end, enter the collection. The remaining particles, the size of which is smaller than the crack number, fall into it and fall into the next lower gap.

A disadvantage of the known device is low productivity and low separation accuracy.

The aim of the invention is to increase productivity by increasing the discharge rate of the separation products.

This goal is achieved due to the fact that the screen is equipped with guides mounted horizontally on the cheek surface, pulleys mounted on the ends of the guides and closed cords.

FIG. 1 - device, general view; in fig. 2 - view A-A of FIG. I; fng 3 is a view of FIG. one.

The screen consists of a bed I, on which panels 3 with columns 4 and 5 are hinged on racks 2. Horizontal rails 6 with pulleys 7 are mounted on racks 4, and profile rollers 8 and 9 driven in opposite directions are mounted on racks 5 motor 10 rotates through worm gears P. In the grooves made on the side surfaces of the guides 6. and also the corresponding pulleys 7 are enclosed in cords 12 covering the profile rollers 8 and 9. Even shchiury (score from the top cord in the bottom Fig. I) covers the roller 8, and the odd ones — the roller 9. The direction of movement is shown in FIG. 3 arrows.

The outer opposite edges of the cords 12 form the surfaces of the sorting sheath 13. The angle of the slit solution can be worn out by rotating the adjustment screws 14.

The guides b on the uprights 4 are shifted in the direction of the cords, and in the free spaces formed under the pair Hanf of the rollers 7 there are introduced pullers 15 associated with collections of classified fractions 16. The collection of the smallest fraction 17 is located under the sorting slot along it.

Above the slit in the middle part of it is fixed a bunker 18 with material 19 intended for classification. The roar works as follows.

By turning the adjusting screws 14, the required angle of the sorter slot 13 is set. The angle is set such that the distance between the edges of the upper pair of cords 12 would be greater than or equal to the size of the largest granules of the material being classified.

The source material is placed in the hopper is, from which it is loosely sprinkled into the sorting slot 13. Particles that are larger than or equal to the distance between one of a pair of cords remain on these Cords and are removed from the classification zone to the left or to the right. Having reached the region of divergence of the cords, the particles fall onto one of the pullers 15, and according to them - the corresponding collection 16.

Some particles in the process of falling fall in contact with moving cords at a level that does not correspond to them.

sizes. These particles are held on these cords and they cannot get into their collection, since the cords protrude from more than half of their diameter.

The speed of movement of the snaps should be the greater, the greater the flow of particles to the classification, i.e., the greater the productivity.

In this case, the opposite direction of movement of the cords at different levels

will eliminate the appearance of high velocity particles in the horizontal direction and the associated decrease in the accuracy of separation into fractions due to the particles leaving the classification zone before they reach the levels corresponding to the sizes. Besides; this will intensify the process of classification, promote good tingling of the granules and the claim. the key is free formation and freezing.

The proposed device is able to classify products of any hardness, in particular, very fragile ones. The performance and accuracy of the separation device does not depend on the shape. and the state of the surface of the particles, nor from their moisture. When classifying high-quality and dusty products, cleaners and dryers can be installed in the non-working part of the cords.

Fbrmula invention

A slotted screen comprising a frame, cheeks and sheets forming a slotted V-shaped gap, characterized in that, in order to increase productivity by increasing the ckopocTH of the separation products, it is provided with guideways mounted horizontally on the cheek surfaces, pulleys mounted on the ends of the closed cords.

Sources of information taken into account when examining

1. USSR author's certificate number 497059. class. B 07 B 1/40, 1973.