| As one of the important equipment of fully mechanized coal face, scraper conveyor’s reliability life directly affects enterprise security, economic, efficient production of the coal. As the only transport equipment for fully mechanized coal mining face, for the poor working conditions, load diversity, the safety and reliable operation is very important. In recent years, along with the application of new technology, new materials and new technology, domestic scraper conveyor equipment and technology has been rapid development, and played a great role in promoting coal production to achieve high yield efficient. However, there is still a certain gap between the domestic and foreign advanced equipment of scraper conveyor, mainly reflected in the reliability and service life, so it is an urgent need to study the reliability and service life of scraper conveyor, and then improve its reliability level.This topic is based on the theory of reliability life and fatigue life theory to analyze the reliability of life of the scraper conveyor. First, according to the theory of reliability life combined with the actual working conditions of the scraper conveyor, screening the reliability of life indicators. Then, analyze two years of failure statistics of the Shen Dong scraper conveyor, scraper its reliability level, and identify the weakest link of the reliability life, and then analyzes the main reasons of its weakest link.Then, using the ANSYS/FE-SAVE software, analyze48mm X152mm ring chain stress and fatigue life,analysis shows that the chain and chain contact surface and ring chain straight edge to the inside of the arc phase exist stress concentration, chain’s fatigue life minimum and the safety factor minimum are at the position of the straight edge of the inside of the chain and chain contact surface and the ring chain and arc phase position, the ring chain fatigue life of the outside is greater than the inside. Subsequently, analyze the fault data of the scraper conveyor, proved that the life of the scraper conveyor obey the Weibull life distribution, to calculate the life expectancy indicators and identify the law of life, then judge the overall level of reliability life. Use "Degradation" theory to expect its number of overhaul and the amount of coal of the each overhaul.This paper identify the weakest link of the reliability life scraper conveyor machine through reliability life analysis; and then predict its life prediction of fatigue reliability; Finally, analyze the failure data to come to the law of the life of the scraper conveyor, expect the number of overhaul and the amount of coal each overhaul, provide the basis for early repair, and also provide a reference method for the reliability of life of the other types of scraper conveyor, It’s advantageous to improve the reliability life of scraper conveyor, and has practical significance for reasonable production management,and provide reference for managers. |
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