工程机械故障特点分析及经验诊断（Fault analysis and experience diagnosis of construction machinery）.docVIP

工程机械故障特点分析及经验诊断（Fault analysis and experience diagnosis of construction machinery） 6-11 1, stage and characteristics of engineering machinery fault (1) the initial stage of the fault characteristics of the use of construction machinery. Engineering machinery in initial stage (equivalent to running) the fault is from high to low (lower curve), using the initial failure rate is high with the production or maintenance of quality and running time of the use of the. If the engineering machinery manufacture or repair of high quality, and can accurately use and protection. Then, the initial failure rate is low. Otherwise the early failure rate will be higher. Early fault more is loose or loose bolts; loose or loose pipe joints: residual metal chips or foundry sand clogging oil channel or caught in relative friction injury parts (such as hydraulic system of actuator cylinder) caused by oil spills, the gap or the pressure produced change after the swap, can not make parts in order to implement the provisions of, some joint because of the bolt is not tight and Water Leakage, oil and air leakage etc.. (2) the normal use of engineering machinery fault characteristics. Engineering machinery running after the stop in the normal use stage. Construction machinery operation in this stage, as long as the required maintenance and accurate use, generally will not fail, even if the failure is also a failure of random (this fault is hidden, or not easy to maintain, so the invention review) the failure rate is very low, flat curve edged up. If the engineering machinery fault occurs in the normal use period is accidental or due to improper use and maintenance. (3) the fault characteristics close to overhaul period of the use of construction machinery. When close to the engineering machinery overhaul period, each component deterioration loss increases. The fault feature of this stage is the high failure rate and wide, mostly due to wear and burned parts caused by aging, oil leakage, pluggin