DBPapers
DOI: 10.5593/SGEM2014/B13/S4.120

RELIABILITY OF THE COMPONENT UNITS OF EXCESSIVE WEAR OF COAL PREPARATION EQUIPMENT

D. G. Margareta, F. V.Alexandru
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-09-4 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 3, 941-948 pp

ABSTRACT
Energy coal exploited in the mining basin of the Jiu Valley is prepared and concentrated in Coroești plant, the subject of technological stages: classification, selection, breakage, jigging concentration draining. Technological equipment in existing plant consists of: vibrating screens, crushers, jig washer and vibrating centrifugal machines; the vibrating screens made classification, desliming and draining of coal. The paper presents the results of the working behavior of vibrating screens type SCC III 2.6x5.25 for a period of 29 months. Based on data obtained regarding operating times between failures and times consumed with repair work, it could be an analysis of reliability for some subassemblies which presented significant wear, for example: splits, couplings, springs, troughs, beams, steel flats, etc. Were calculated time intervals to determine the relative and cumulative frequency as well as mean time between failures, failures rate and reliability variation depending on the time of operation based on distribution exponential and Weibull. The distribution law adopted (exponential or Weibull) was validated under test Kolmogorov, for each subassemblies analyzed. Determine the reliability of using distribution exponential and Weibull for subassemblies vibrating screens type SCC III 2.6x5.25 has great theoretical importance but mostly practical creating a data base of reliability parameters useful in practice to establish the required spare parts, preventive maintenance planning including maintenance organization based on reliability.

Keywords: vibrating screens, coal, reliability, subassemblies, failures

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