Research And Application On The Key Technology Of RCM For Large Complex Lifting Machinery

With the rapid development of modern society,whether it is the manufacturing industry or trade transport industry has a great demand for lifting machinery.The pace of development of lifting machinery in our country is very fast,However,from which the lifting machinery maintenance management level is far behind.Most maintenance management system of lifting machinery in our country is still in the level of 80 and 90 s,which has been difficult to meet the current demand.In addition to the level of maintenance management,most of the lifting machinery is working in the harsh environment conditions of high temperature,being easily eroded,which has brought a great test to the normal work of the crane.Applying the international advanced RCM technology can effectively improve the maintenance management level of the large complex lifting equipment.It can not only ensure the reliability of the equipment,but also optimize the maintenance decision-making,improve work efficiency,reduce maintenance costs,and bring significant economic benefits to the enterprise.These are very favorable for the lifting machinery industry.To solve the above problems,the following work is carried out in this paper:(1)This paper carry out the research on the RCM analysis method for the metal structure of the lifting machinery through the basis of a general RCM analysis method.And the decision method of a structure significant item of lifting machinery is determined.Besides,the failure modes,fault effects and fault hazards of a structure significant item of lifting machinery is researched.Furthermore,various decision criteria in RCM logic decision are determined,which makes the analysis more convenient and reasonable.(2)The basic data collection method of RCM analysis is studied,and the method of obtaining basic data by state monitoring is determined.In this paper,the 450 T bridge crane is made as an object,of which the stress hotspot region is determined by finite element analysis.Besides,the stress state of these stress hotspot region is monitored by Fiber Bragg grating strain sensor.Then,the calculation result of fatigue life of this 450 T bridge crane metal structure is based on the stress data of the condition monitoring,which is very important for RCM analysis.(3)Based on the fatigue life data,the metal structure of the 450 T bridge crane is analyzed by RCM analysis method.Then the maintenance cycle and maintenance requirements of each structure significant item are determined.Since the data information used in this analysis is based on the actual state of the 450 T bridge crane,closer to the actual situation of the structure,the analysis result is very effective and reliable.