STRING SCREEN DESIGN AND TESTING

It is proposed to perform coal grading using a string screen designed at the Siberian Federal University. The screen has a simple design and is free of vibrating. It implements gravity method to feed and screen coal, which enables a driving unit to be eliminated. The screen design is presented, and its working model is manufactured. To make grading more efficient, it is suggested to equip screening panels with downtilters intended to tilt coal using the gravity force. In this case, fine particles and dust are removed from large coal lumps, which increases efficiency of the screen. The housing meant to close the screen during operation meets ecological standards imposed on mining equipment. Aiming to evaluate grading quality of the string screen, check screening of foamed polystyrene and wood composed of various size particles was undertaken. The check screening was performed separately for foamed polystyrene and wood, as well for their mixture. The foamed polystyrene grading efficiency by the string screen with the screening panels inclined at 30º and the front wall slope of 60º was 93.89–98.49%. Furthermore, grading efficiency was estimated for foamed polystyrene and polystyrene and wood mixture on the string screen model. The string screen model grading efficiency makes 81.62–98.49%, and the efficiency of grading worsens with an increase in the inclination of the screening panels and front wall.

Keywords

Screen, grading, screening, screening panels, downtilter, bunker, inclination, size grade, efficiency.

Issue number: 8
Year: 2018
ISBN:
UDK: 622.333.622.721
DOI: 10.25018/0236-1493-2018-8-0-147-155
Authors: Demchenko I. I., Ignatova O. S., Plotnikov I. S.

About authors: Demchenko I.I., Doctor of Technical Sciences, Professor, e-mail: demtchenkoii@yandex.ru, Ignatova O.S., Senior Lecturer, e-mail: ignatova.ol@mail.ru, Plotnikov I.S., Candidate of Technical Sciences, Assistant Professor, e-mail: bigiv89@yandex.ru, Siberian Federal University, 660041, Krasnoyarsk, Russia.

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