Open AccessIMPROVEMENT OF VIBRATING FEEDERS-SCREENS FOR MINING AND METALLURGICAL INDUSTRY
Author(s) -
Vasyl Liashenko,
В. З. Дятчин,
В. П. Франчук
Publication year - 2018
Publication title -
izvestiâ vysših učebnyh zavedenij. černaâ metallurgiâ
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 0.3
H-Index - 7
eISSN - 2410-2091
pISSN - 0368-0797
DOI - 10.17073/0368-0797-2018-6-470-477
Subject(s) - vibration , oscillation (cell signaling) , computation , amplitude , coke , mechanical engineering , mode (computer interface) , mathematical model , basis (linear algebra) , quality (philosophy) , structural engineering , engineering , process engineering , computer science , acoustics , mathematics , materials science , metallurgy , algorithm , statistics , physics , genetics , quantum mechanics , biology , operating system , geometry
The main scientific and practical results of the improvement of vibrating feeders-screens for mining and metallurgical industry are presented on the basis of dynamic calculation of the vibrating feederscreen with two differently directed self-balancing vibrators. Methods of theoretical generalizations are described using mathematical statistics, physical and mathematical modeling, computation and feasibility studies, laboratory and full-scale experimental studies, industrial tests in the conditions of operating enterprises using standard and new methods. Mathematical modeling and calculation of the parameters of a vibrating feeder of the PVG type are proposed. It is recommended when choosing dynamic parameters of the feeder, to use the vibration transmission coefficient, which is taken within the limits (1.5 – 3.5)g, and in heavy loading modes, is up to 5g. It is shown that during preparation of breeze coke in the crushing body, from 10 to 50 % of fine material is received from its bunker with a particle size of 0 – 3 mm, which is additionally re-milled, reducing the quality of coke. A vibrating feeder-screen with a spatial oscillation of the working element will increase the efficiency of screening of the material by 15 – 20 % and will improve the self-cleaning of the screen. The driving forces of the exciters are directed at different angles of 15 and 45° to the screening surfaceand are attached from each other at a distance equal to half width of the box, i.e. 600 mm. It is established that in the resonance mode at a constant amplitude with increasing frequency the coefficient of the vibro-displacement regime increases according to a quadratic dependence, at a working frequency of 100 rad/s it also increases from the loading edge of the feeder to the unloading and from one side to another, the value of which varies within 2.62 – 2.84.