SU1616719A1 - Arrangement for screening loose material - Google Patents

Abstract

The invention relates to a technique for the separation of bulk materials by size during the separation of grain and its products. The purpose of the invention is to improve the quality of screening by improving the cleaning of the upper sieve (C). The device comprises upper C 1 and lower C 2 obliquely mounted one above the other, oscillating. Between C 1 and 2, partitions 3 are fixed, dividing the inter-sieve space into compartments. The compartments contain spherical cleaning elements (OE) 4. The gap between C 1 and 2 at the end of each of the previous compartments is smaller than at the beginning of the subsequent compartments. Alternately striking C 1 and 2, the elements 4 move in the direction of increasing the gap between C 1 and 2. As the partition 3 is reached, the elements 4 change the direction of movement to the opposite. 1 il.

Description

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The invention relates to a technique for dividing bulk products into particles and can be used in the processes of separation of grain and products of its processing.

The purpose of the invention is to increase the quality of screening by improving the cleaning of the upper sieve.

The drawing shows a device for the de-growing of bulk material, a slit.

A device for sifting bulk material includes upper 1 and lower 2 sieves obliquely mounted one above the other, making oscillatory movements. Between screens 1 and 2 in the course of the movement of the Material, partitions 3 are fixed, dividing the inter-sieve space into separate sections. The compartments contain spherical cleaning elements 4. The size of the gap between sieves 1 and 2 decreases as material moves, with it being smaller at the end of each of the previous adjacent compartments than at the beginning of subsequent screenings.

The device works as follows.

The initial mixture is fed to the upper I sieve 1. The fine particles pass through the il and 2 sieves and form a pass fraction. I Large particles are moved along the top 1 sieve 1 and constitute the tailing fraction. Difficult particles with sizes close to: to the determining size of O1 holes. stuck in the sieve, reducing its live section. The cleaning of the upper sieve 1 from: stuck in the holes of the particles is carried out with the help of cleaning elements I, 4, which are spherical bodies made of elastic material. The oscillatory movement of the device leads to an alternate collision of the cleaning elements 4 d with sieves 1 and 2 and the cleaning of the upper sieve from stranded particles in the holes. In this case, the angle of the cleaning element on the sieve 01 and the angle of reflection CG, according to the known law of physics, are equal. As a result, the scrubbing elements alternately collide.

with the upper and lower screens, move in the direction of increasing the gap between the screens (the movement of the cleaning elements is shown schematically). As the partition reaches 3 cleaning elements

change the direction of motion to the opposite, which ensures their periodic movement along the sieves.

Claims (1)

Invention Formula A device for sifting bulk material, including sieves mounted obliquely above each other, with a gap relative to each other; quality screening due to improvements cleaning the upper sieve, the gap between the sieves decreases as the material travels, and the gap between the sieves at the end of each of the previous adjacent compartments is smaller than the gap at the beginning of the subsequent compartments from the loading end to the unloading one.