SU778821A1 - Device for pneumatic sizing of bulk materials - Google Patents

Description

(54) DEVICE FOR AIR CLASSIFICATION OF BULK MATERIALS BY LARGE

The invention relates to the enrichment of minerals, namely, devices for air classification of bulk materials by size by sieving on sieves. A device is known for classifying bulk materials by size by blowing the screen cloth with a gaseous stream, including a working chamber in the form of a closed container with a hopper in the lower part and a screen cloth under which the air supply line 1 is installed. However, the known design has a low classification efficiency due to the frequent clogging of the sieve with particles of bulk materials and heavy losses of the fine fraction with air flow. The closest in design features to the invention is a device for air classification of bulk materials by size, including a cylindrical body, in the upper part of which is fixed a sieve cloth with an air supply device installed under it and a filter from a gas-permeable material for cleaning the bottom material product and receivers for products of classification 2. This known construction has the disadvantages that the filter is made continuous Schirin podsitovogo entire space, operate with very high load, which contributes to rapid deterioration of filter clogging its fine fraction and decreasing classification efficiency. The purpose of the invention is to increase the efficiency of classification by reducing the load on the filter and clogging it, as well as ensuring continuity of the process. The goal is achieved by the size of the device for air classification of bulk materials, including a cylindrical body, in the upper part of which there is a screen cloth with an air supply installed, an air supply filter, a filter made of a gas-permeable material for cleaning the bottom product and receivers for classification products, the perimeter of the casing is filled with windows in which filters are placed, and an insert in the form of a truncated cone facing smaller base to the bottom of the hull.

FIG. 1 schematically shows the proposed device, general view, section; in fig. 2 - working capacity of the filter with a conical insert.

A device for air classification of bulk materials by size includes a cylindrical body. 1, in the upper part of which is fixed a screen cloth 2 with an air supply device installed under it and movable relative to it, consisting of a nozzle 3 mounted on a flexible pipe 4 connected to pipeline 5. In the sub-screen part of the cylindrical body 1 along its perimeter there are windows 6, in which filters are placed, and the insert 7 in the form of a truncated cone, facing downwards with a smaller base, the insert 7 being attached to the body 1 by its upper part. The housing 1 is hermetically sealed at the top with a lid 8, provided with a feeder 9 with a regulating device 10 and a receiver 11 for a supra-sieve product with a discharge pipe 12.

The lower part of the housing 1 is made in the form of a hopper 13, which communicates with the supply pipe 14 of a downstream device for air classification.

Device for air classification works as follows.

The source material to be classified is poured into the feeder 9. Compressed air is supplied to the pipe 5, which through the flexible pipe 4 enters the nozzle 3. The nozzle 3 is driven by the reaction of the outgoing air stream, ensuring the entire working surface of the screen sieve is blown out the feeder 9 into the sub-space of the housing 1, the amount of feed material is controlled by the device 10. The air flow stream flowing out of the nozzle 3 stirs up the starting material and, reflecting from the lid 8, it ohodit through the cell sieve webs 2 and carries small particles, fraction podsitovoe space. In the sub-pit space, air along with the fine fraction passes through filters placed in windows 6, made around the perimeter of housing 1, and insert 7 (in the form of a truncated cone). The air through the windows 6 is released to the atmosphere, and the fine fraction (sub-sieve product) is collected in the hopper 13, from where it is fed through the nozzle 14 to the next device for classification with a smaller sieve, where the process is similar.

Hedge product through pipe 12 enters the receiver I.

The proposed device allows air classification of bulk materials into any number of coats.

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Since the exhaust air is removed into the atmosphere directly from the sub-sieve space without the use of special pipelines, its resistance to removal is much less than in known structures, which improves the quality of classification.

The use of an insert (cone) 7 makes it possible to increase the efficiency of trapping fines in the housing, facilitates the operation of filtering gas-permeable windows 6,

reduces their clogging and prevents the possibility of direct injection of dust into the gas-permeable windows 6, which can occur with increasing scope of movement of the nozzle 3.

J The application of the proposed device for air grading of bulk materials makes it possible to efficiently carry out preliminary and final grading of diamond powders in order to simultaneously obtain powders of a stiffened grain composition (with an increased grain content of the main fraction). The economic effect from the introduction of such a device is 20 thousand rubles. in year.

Claims (2)

1. USSR author's certificate number 297404, cl. At 07 At 4/08, 10/24/69. 2. USSR author's certificate No. 408673, cl. B 07 B 4/08, 24.12.71 (prototype). eleven ig.2