METHOD FOR SEPARATION OF BULK MATERIALS INTO FRACTIONS BY METHOD OF THROWING MIXTURE OF PARTICLES AT SAME SPEED AND DEVICE THEREFOR Russian patent published in 2018 - IPC B07B4/02 B07B13/10 

FIELD: construction.

SUBSTANCE: invention relates to the building materials industry and can be used in other branches of the national economy where it is necessary to sort the loose materials by fractions, for example sand. Method for separating bulk materials into fractions by throwing a mixture of particles at the same speed involves feeding the particulate material and exposing it to an air stream for fractionation. Feed bulk material continuously to a receiving funnel made with a sieve mill for preliminary separation of coarse particles, and then process it by a continuous ascending airflow from the fan supplying the air flow at a frequency of 23–26 Hz. Method is carried out by means of a device including a fan connected by transmission with an electric motor, a conveyor and a receiving funnel, as well as a supply box. Hopper is provided with a sieve grate for preliminary separation of the coarse fraction. Supply box is provided with a grid at the base and an additional channel located under it, connected to the air fan. Supply box is made with an air vibrator and is located at an angle of 25–35° to the horizon. Electric motor is configured to change its speed depending on the initial fraction of the bulk material to be separated. Transmission is made wedge, and the fan itself is equipped with a variator to change the rotation speed of the fan shaft.

EFFECT: increasing the efficiency of the separation of bulk material by fractions.

3 cl, 2 dwg