SU757215A1 - Plant for classifying loose materials by size - Google Patents

Description

The invention relates to the enrichment of minerals and relates to the construction of installations for the classification of bulk materials by size using gas or air flow.

A known device for classifying bulk materials by size with the help of air flow using gravity, having a feeder, a separation chamber with an adjustable separation threshold, receivers with a transporting device and a centrifugal fan for supplying air to the separation chamber (1].

The air supply in this installation is carried out through one ilr several nozzles. The directed air flow 20 thus created does not affect individual small particles, shielded by large particles, which removes _; separation efficiency.

The closest to the invention in terms of design features is an installation for the classification of bulk materials by size, on, tg>, u, 1

2

a new bunker and feeder installed in the upper part of the chamber, a centrifugal fan with upper and lower pat- ters located at a height of 5 separating chambers, and receivers for classification products [2].

In this installation, the design and location of the lower nozzle determine the location of the impact zones of the water flows from the upper and lower nozzles at a considerable distance from each other along the height of the separation chamber. In view of this, by the time the air stream enters the zone of action created by the lower nozzle, the velocity of the material being divided increases.

An increase in the speed of the material to be separated, as well as a decrease in the air flow rate due to the presence of a double-sided horizontal opening at the outlet of the lower nozzle, reduce the efficiency of the use of the latter, and when a certain ratio of the indicated speeds is used, the lower nozzle with air supply from one fan becomes ineffective.

In addition, the design output

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em loss of energy and the uneven velocity of the air flow and does not allow sufficiently effectively affect the material to be divided "the entire width of the receiver of a large product.

The purpose of the invention is to improve the efficiency and quality of separation by reducing the shielding of small particles and increasing the degree of exposure to air flow.

This is achieved by the fact that in an apparatus for classifying bulk materials by size, having a separation chamber with a rotary separation threshold, a hopper and a feeder installed in the upper part of the chamber, a centrifugal fan with upper and lower nozzles located along the height of the separation chamber, and receivers for classification products, the upper and lower fan nozzles are located in the same plane at an angle to each other, and the front wall of the separation chamber is made of two parts, the upper part of which is attached to a pivot mounted in the lower edge of the upper branch pipe, and has a slit communicating with said lower fitting ·,

The invention is illustrated in the drawing.

Installation for the classification of bulk materials by size includes a separating chamber 1 with a rotary separation threshold 2, in the upper part of which is installed the hopper 3 and the feeder 4.

The centrifugal fan 5 is provided with upper 6 and lower 7 nozzles located at the height of the separation chamber 1 in the same plane at an angle to each other, and the angle of inclination of the lower nozzle 7 is changed by means of an adjusting screw 8.

At the bottom of the separation chamber 1, receivers 9 and 10 are installed for classification products with conveying conveyors 11 and 12.

The front wall 13 of the separation chamber 1 is made of two parts, the upper 14 of which is attached to the hinge 15 mounted at the lower edge of the upper nozzle 6, and has a slot 16 that communicates with the lower nozzle 7.

The installation works as follows.

The material from the hopper 3 is transported by the belt feeder 4 to the separation chamber 1. Under the action of the air flow generated by the centrifugal fan 5 and passing through the top 6 and bottom 7 nozzles, the material is divided into pieces.

Depending on the physicomechanical properties of the material to be separated, the most efficient separation mode is achieved by changing the angle between the longitudinal axes of the sockets 6

c and 7 by rotating the upper part 14 of the separating chamber 1 relative to the hinge 15. The upper part 14 is rotated by means of an adjusting screw 8. The collection times, 0 divided material is carried out into receivers 9 and 10, respectively, of large and small products.

Further movement of the separation products takes place with the help of conveyors 11 and 12.

15 Due to the arrangement of nozzles 6 and 7 at an angle relative to each other, a comprehensive flow of large particles by air flow is provided, which eliminates the screening of small particles by large ones.

In addition, the location of the lower pipe 7 on the front pivoting wall 13 of the separation chamber 1 increases the degree of airflow generated by this pipe on the material to be divided and allows for more precise adjustment and regulation of the separation process, which improves the quality of separation of bulk materials.

Claims (1)

Claim An installation for classifying sy35 puchy materials by size, including a separating chamber with a rotary separation threshold, a loading hopper and a feeder installed in the upper part of the chamber, a ventilator with upper and lower nozzles located along the height of the separating chamber, and • receivers for classification products, characterized by the fact that, in order to increase the efficiency and quality of separation for reduce shielding of small particles and increase the degree of exposure to air flow, the upper and lower fan nozzles are located in 50 of the same plane at an angle to each other, and the front wall of the separating chamber is made of two parts, the upper part of which is attached to the hinge mounted at the lower edge of the upper nozzle, and has a slot connected to the lower nozzle.