SU914116A1 - Apparatus for classifying grain materials - Google Patents

Description

The invention relates to the technique of classification of granular materials according to particle size and can be used in metallurgy, mining industry, building materials industry and in other sectors of the national economy, which require the separation of polydisperse substances into a number of narrow fractions.

A device for separating granular materials into fractions according to particle size is known, including a classification chamber, a fan, a feeder and receiving bunkers £ ί) ·

However, the device has a low separation efficiency.

Closest to the proposed technical essence and the achieved result is a device for the classification of granular materials, including the precipitation chamber, fan, feeder and receiving bins of C 23.

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The disadvantage is the low quality of classification.

The purpose of the invention is to improve the quality of classification.

This goal is achieved by the fact that the device is equipped with a precipitating chamber placed at the end, with a drive and elastic rods placed horizontally, while the end of the chamber in front of the damper is perforated.

Moreover, the precipitation chamber is made in the form of a hexagonal straight prism, the base of which has the shape of two isosceles. Trapezes with a common smaller base, the ratio of the larger base of each trapezoid to the smaller one and the ratio of the height of the trapezium is 1.7 dB 2, and the ratio of the height of the prism to the smaller base - from 20 to 25 ·

FIG. 1 shows the device, a general view; in fig. 2 - the same view

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'above) in FIG. 3 "section A-A in FIG. 1.

The device contains a precipitation chamber 1, equipped with a feeder 2, a transfer bin 3 ”cyclone 4 and 5 by an exhaust fan 5 · Elastic rods 6 located 10 horizontally are installed in a staggered manner directly perpendicular to the direction of air flow. Here in the end wall of the chamber 1 is installed with the possibility of rotation of the valve 7, associated with the actuator 8 and enclosed in a perforated protective casing 9 · 15

Across the length of the bottom of the chamber are receiving hoppers 10.

The precipitation chamber 1 is made in the form of a hexagonal straight prism, the base of which has the shape of two ₂ isosceles trapezoids with a common smaller base, and the ratio of the larger base of each trapezium to the smaller one, i.e., the ratio of the maximum chamber width to the minimum, is 25 but 1 , 7-2 with the same ratio of their heights, and the ratio of the height of the prism to the smaller base of the trapezium, i.e. the ratio of the height of the camera to its minimum width is equal to 20-25 /

The device works as follows.

5-speed fan creates an air stream in the deposition chamber 1. The starting granular Part rial ³⁵ entering through the feeder 2 is supplied to the settling chamber 1, where it is separated into a stream of air at the bulk mass and size and enters the receiving hopper 10. The smallest particles ⁴⁰ deposited in cyclone 4.

Simultaneously with the fan 5 include the actuator 8, which provides rotation of the valve 7 at a speed of 0.257.5 rev / sec. When this air stream ⁴⁵ in chamber 1 communicates predetermined proportional valve 7, the rotation speed frequency kolebaniy.Etot air flow interacting with the elastic rods 6 informs its oche- ⁵⁰ in red, the latter vibrational motion.

Particles of the source of granular material entering the chamber 1, continuously collide with the rods 6,

located directly under the feeder 2, greatly enhancing the vibration of the latter. As a result of the interaction of the rods 6 and the particles, the steady-state motion of the latter is disturbed and those of the small particles that were in the aerodynamic sequence of large particles leave it, are picked up by the air flow and are carried away to the small product.

In order for all small particles to emerge from the aerodynamic shadow of large ones, repeated collisions of the latter with rods 6 are necessary, which in turn is ensured by the height of the settling chamber 1 sufficient for this purpose.

The movement of particles (mostly small) is also affected by the flap 7. during rotation of which the inlet section of chamber 1 periodically overlaps, with the result that oscillations of the air flow of a given frequency occur in the chamber. When the valve completely blocks the inlet section of the chamber, air is sucked through the receiving bins 10 towards the settling material. Small particles present in it are picked up by the upward flow and move forward and upward. When the flap is fully open, these particles do not move forward and down. Thus, the elastic rods 6 and the valve 7 are regulators, unrestrained movement of the particles and increase the purity of the products obtained.

When wet and lumping materials are separated, as a result of the interaction of stuck lumps with vibrators, the first to single particles are crushed, and this process is much more efficient than in the case of using non-vibrating rods. In addition, wet material does not stick to vibrators and does not form deposits.

Since the precipitation chamber 1 narrows as it moves away from the point of entry of the source material, all particles acquire large acceleration values compared to their movement in a channel of constant cross section.

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However, the smallest increments of acceleration are obtained by small particles. They seem to be pulled by the air flow from the zone where large and medium particles settle. The presence of the transition hopper 3 allows you to eliminate turbulence in the front part of the chamber 1, and the perforated protective casing 9 reliably protects the staff from accidental contact with the rotating valve 7 and prevents entry of foreign objects into the installation.

The use of the device. For classification of granular materials allows to improve the quality of classification.

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Claims (2)

Claim I. A device for classifying granular materials, including a precipitation chamber, a fan, a pit'el and receiving bunkers, characterized in that, in order to improve the quality of classification. The device is equipped with a damper with an actuator and elastic rods placed horizontally at the end of the settling chamber. , wherein BUT ten the end of the chamber in front of the flap is perforated. 2. The device according to p. ^ Characterized in that the precipitation chamber is made in the form of a hexagonal straight prism, the base of which has the form of two isosceles trapezium with a common smaller base ;; This means that the ratio of the large base of each trapezoid to the smaller one and the ratio of the heights of the trapezium ranges from 1.7 ° to 2, and the ratio of the height of the prism to the smaller base varies from 20 to 25.