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Accident Analysis of“Hand Injury by Drawknife”of Surface Planers

SUN Shu-ying(Department of Art & Design,Zhengzhou Institute of Aeronautical Industry Management,Zhengzhou Henan 450015,China)  
Surface planing is usually intended for the datum surface of components to be processed,not only an indispensable process but also a process involving a lot of accidents in furniture manufacturing,with "hand injury by drawknife"accidents occupying the largest proportion.With"hand injury by drawknife"accidents as a top incident,the causes of "hand injury by drawknife"accidents are investigated,the accident tree and the accident tree logic diagram are drawn;the minimum cut set and the least path set of the"hand injury by drawknife"accident tree is calculated with Boolean algebra,with structural importance degrees of each basic incident analyzed;according to the six grades of failure probability of Dupont Company,based on the probability assignment of basic incidents,through the calculation of the occurrence probability of the top incident of"hand injury by drawknife"accidents,the probability importance coefficient and critical importance coefficient of each basic incident are calculated and analyzed and the effect of each basic incident on the top incident of "hand injury by drawknife"accidents is found out from the angles of sensitivity and their probabilities,thereby providing basis for the formulation of safety measures against"hand injury by drawknife"accidents.
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