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Analysis on vertical steering vibration of drum shearer cutting part

Journal of Central South University 2018年第11期25卷 2722-2732页

作者： YANG Dao-long LI Jian-ping WANG Yan-xiang JIANG Hong-xiang School of Mechatronic Engineering Jiangsu Normal University School of Engineering China University of Mining and Technology

The impact of the load on the shearer is mainly transmitted through cutting *** this paper,in order to get the vertical steering vibration characteristics of the cutting part of the drum shearer,the working condition of coal mining machine is simplified.A simplified vertical steering model and the simplified vibration model of the whole cutting part of shearer are *** vertical steering vibration process of the cutting unit is simplified into a single freedom and one forced vibration system under harmonic *** dynamic response of the cutting part under sine excitation is obtained by using Matlab/Simulink for modeling and *** influence of the support rigidity and damping of the high oil cylinder on the vertical steering vibration characteristics of the cutting part is *** results show that the damping of the cylinder can reduce the vibration of the system and the stability of the swing process of cutting the part is improved.

关键词： drum shearer shearer cutting part vertical steering vibration Matlab/Simulink

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Reliability modeling of hydraulic system of drum shearer machine

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Journal of Coal Science & Engineering(China) 2011年第4期17卷 450-456页

作者： SEYED HADI Hoseinie MOHAMMAD Ataie REZA Khalookakaei UDAY Kumar Faculty of Mining Petroleum ＆ Geophysics Shahrood University of Technology Shahrood *** Iran Division of Operation and Maintenance Engineering Lulea University of Technology Lulea 97187 Sweden

The hydraulic system plays an important role in supplying power and its transition to other working parts of a coal shearer machine. In this paper, the reliability of the hydraulic system of a drum shearer was analyzed. A case study was done in the Tabas Coal Mine in Iran for failure data collection. The results of the statistical analysis show that the time between failures （TBF） data of this system followed the 3-parameters Weibull distribution. There is about a 54% chance that the hydraulic system of the drum shearer will not fail for the first 50 h of operation. The developed model shows that the reliability of the hydraulic system reduces to a zero value after approximately 1 650 hours of operation. The failure rate of this system decreases when time increases. Therefore, corrective maintenance （run-to-t^ailure） was selected as the best maintenance strategy for it.

关键词： reliability modeling hydraulic system drum shearer maintenance strategy

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Reliability and maintainability analysis of electrical system of drum shearers

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Journal of Coal Science & Engineering(China) 2011年第2期17卷 192-197页

作者： SEYED Hadi Hoseinie MOHAMMAD Ataei REZA Khalokakaie UDAY Kumar Faculty of Mining Petroleum ＆ Geophysics Shahrood University of Technology Shahrood *** Iran Division of Operation and Maintenance Engineering Lulea University of Technology Lulea 97187 Sweden

The reliability and maintainability of electrical system of drum shearer at Parvade. 1 Coal Mine in central Iran was analyzed. The maintenance and failure data were collected during 19 months of shearer operation. According to trend and serial correlation tests, the data were independent and identically distributed （iid） and therefore the statistical techniques were used for modeling. The data analysis show that the time between failures （TBF） and time to repair （TTR） data obey the lognormal and Weibull 3 parameters distribution respectively. Reliability-based preventive maintenance time intervals for electrical system of the drum shearer were calculated with regard to reliability plot. The reliability-based maintenance intervals for 90%, 80%, 70% and 50% reliability level are respectively 9.91, 17.96, 27.56 and 56.1 h. Also the calculations show that time to repair （TTR） of this system varies in range 0.17-4 h with 1.002 h as mean time to repair （MTTR）. There is a 80% chance that the electrical system of shearer of Parvade. 1 mine repair will be accomplished within 1.45 h.

关键词： drum shearer electrical system reliabilitv maintenance

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