SU1162510A1 - Apparatus for classification of loose materials - Google Patents

Abstract

1. DEVICE FOR CLASSIFICATION OF OUTSIDE MATERIALS, including a scattering unit with a screen cloth, under which a nozzle is installed on an elastic pipe, a line for supplying and discharging air, a device for discharging fines and an actuator for moving the nozzle in a plane parallel to the screen, the bunker. product and device for unloading coarse fraction mounted above the screening cloth, characterized in that, in order to improve the quality of the classification by more stable movement of the nozzle, it It provided with abutments-reflectors mounted around CAS la.

Description

2. tea The device according to claim 1, is made in the form of a pipe, which is adapted to unload the coarse fraction 1162510 from the sieve cloth at a distance of 0.15-0.25 of the diameter of the pipe.

The invention relates to the field of classification of fine materials by size. The purpose of the invention is to improve the quality of classification by more stable movement of the nozzle. The drawing schematically shows the proposed device. The device includes a unit 1 with a sieve 2 and a centrally located nozzle 3 mounted on a flexible elastic pipe 4 fixed on the air supply line 5, feeding pipe 6, connecting the unit to the hopper 7 of the original product, connecting pipe 8, connecting the unit 1 with collector 9, a suction (coarse) fraction, a discharge pipe 10, connecting unit 1 with a collector. 11 of a subsite (fine) fraction. Valves 12-14, connected to the control system, are installed on the supply, unloading and discharge pipelines. The block 1 is mounted on a not 15 articulated parallelogram linking the actuator 16. Inside the block i, there are stops-reflectors 17, the discharge pipe 8 is equipped with a nozzle 18 installed at a distance b above the surface of the sieve cloth 2, b. 25с1, where d is the diameter of the hole in the nozzle. The specified range of distance values h is determined from the following considerations. The maximum value of b should be such that the speed of the air flow in the gap between the nozzle and the sieve is not less. than in the socket. From this condition the following jfji blows: - r-- Jfjli, whence, 25d. In addition, a significant reduction in the gap between the nozzle and the sieve in order to increase the air velocity in the gap is impractical, since with a small gap the layer of classified material on the sieve closes the opening of the nozzle And makes unloading difficult. Therefore, the range of values for the specified distance is 0.15-0.25 d. The optimality of the specified range has been verified experimentally; The installation works as follows. When the actuator 16 is running continuously and the air is continuously supplied to the pipeline 5 by a signal from the valve control system, the valve 12 is opened and, after flowing through it to the sieve from the bunker 7, portions of the starting material are closed. Portion feed prevents the strainer from being overloaded with excess material and promotes good sieving. Due to the fact that block 1 is fixed on the connecting rod link 15 of the mechanism of the articulated parallelogram, it performs translational motion along a circular trajectory in a plane parallel to the sieve fabric. Due to the fact that the natural frequency of oscillations of the elastic-mass system of the nozzle 3, the flexible elastic nozzle 4 is chosen close to the frequency of the circular translational motion of the link 15, the nozzle 3 acquires a tendency to move along a circular trajectory with a radius greater than the radius of the crank links of the mechanism, and sufficient for in order to provide airflow resulting from the nozzle with a stream of air from the outermost zones of the sieve cloth. However, when this tendency is implemented, the nozzle periodically encounters stop-reflectors 17. Elastic interaction with the latter introduces perturbations into the circular trajectory of the nozzle and, ultimately, causes the nozzle to move along a complex trajectory, ensuring that all zones of the sieve cloth are blown out of the air flow from the rotor. When the valve is open, the airflow is 14, expire3

Due to the outflow inertia of the nozzle 3, it blows a portion of the sieve cloth under which the nozzle is at the moment, weighing some of the material on the sieve. In the next moment, due to the described movement of the nozzle, the adjacent portion of the sieve is blown. above the sieve, exits through the previously purged area of the sieve, while transporting through this section of the fine fraction a powder that is suspended in the sieve. Small (the poditic fraction of the powder accumulates in the collector 11, a large fraction of the powder accumulates above the sieve.

After a period of time sufficient for sieving of the supplied portion of the classified material, the valve 14 is closed by a signal from the control system, the valve 13 is opened. At the same time, the accumulated volume on the large screen is large (the nadsite} fraction is transported to collection 9.

 After the expiration of the time required for full unloading of the oversize fraction, the control system; valves gives signals for opening - closing valve 12, closing

.GZ valve, valve opening 14.

625104

The sieving cycle is repeated as described.

The proposed device combines the advantages of continuous J operation devices (mechanization of the process, lack of manual labor) with the possibility of achieving high quality classification with sufficient process performance. At the same time, a high quality classification is achieved by installing a sieving unit on a connecting rod linking mechanism of a hinge parallelogram, which, combined with the use of reflectors' stops, causes a stable movement of the nozzle to blow all areas of the sieve cloth, independent of the reaction forces of the air stream flowing out of the nozzle, which makes it possible to reduce the amount of air used, thereby increasing the dimensional resistance of the sieve and eliminate overgrinding of the classified material during its transport irovke by pipeline to collections; using a nozzle installed on the unloading main above the sieve at a distance of b (0.15 - 0.25) s /, where c is the diameter of the nozzle, ensuring reliable unloading of the oversize product while excluding the possibility of entering the large fraction of the small product into the collection.

Claims (2)

1. DEVICE FOR CLASSIFICATION OF BULK MATERIALS, including a scattering unit with a screen cloth, under which a nozzle is mounted on an elastic pipe, lines for supplying and removing air, a device for unloading fine particles and a drive for moving the nozzle in a plane parallel to the screen cloth, the hopper of the initial product and a device for unloading a large fraction, installed above the screen cloth, characterized in that, in order to improve the quality of classification by more stable movement of the nozzle, it is equipped with Stops on reflectors mounted around the nozzle. , SU ,,. 1162510 ιψι 2. The device according to π. 1, about l and - it is made in the form of a branch pipe, which is installed in that adapted from the screen cloth for separation for unloading a large fraction of the standing of 0.15 - 0.25 diameter of the branch pipe.