Study On Safety Evaluation Index System Of Overhead Traveling Crane

Hoisting machinery are widely applied not only in manufacturing,but also in other industries.And the loss of every lifting equipment accident is huge,whether it's economic loss or casualties.Many experts and scholars at home and abroad have found that before the crane accident happened,if a reasonable safety assessment is carried out,the potential risk of the system can be found and the measures and suggestions to reduce the risk are given.This will reduce the occurrence of accidents of hoisting equipment and play a role in preventing accidents.Compared with foreign countries,the research on system safety evaluation started late by domestic experts,and even less about special equipment such as cranes.At present,most of the safety evaluation methods of hoisting machinery are design weight coefficients,and the evaluation functions are constructed by all kinds of weighted average.These lifting machinery safety evaluation schemes can not highlight the "one ticket veto" of the key items in the crane evaluation index,and can not reflect one of the series system composed of all key items.Once the key item is "failure",the whole system will fail.On the basis of the unascertained measure theory,this paper not only considers the weighted average in the unascertained measure theory evaluation method,but also considers the "one vote veto" of the key item,which makes the evaluation result closer to the actual situation.In addition,the economic loss caused by mistaken evaluation is also studied in this paper.According to the two possibilities of erroneous evaluation,we should take the mistaken evaluation of safety status as "bad" as the "safety" of safety state and the mistaken evaluation of safety state as "good".We should make a false evaluation of the safety state and evaluate the economic loss of the system.When selecting the calculation elements of miscalculation of economic losses,this paper studies the classification of the elements of various calculation methods at home and abroad,and formulating the calculation elements that meet the economic losses caused by mistaken evaluation.In order to simplify the calculation elements,some assumptions and approximate estimates are made.