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1.故障现象1台LTM1160型汽车起重机完成吊装工作后,按正常速度同步收缩Ⅱ、Ⅲ、Ⅳ节吊臂。当完成收缩后,Ⅳ节吊臂出现自动向前伸出故障,且该故障越来越严重,最后发展到吊臂伸、缩动作均不止常。此外,该起重机在20km/h以上行驶速度下制动时,吊臂还会自动向前窜动200mm左右。2.原因分析根据故障现象分析,很可能是吊臂伸缩缸出现问题。该起重机吊臂伸缩缸是结构比较复杂的多级液压缸、由一
1. Symptom 1 LTM1160 truck crane to complete lifting work, according to the normal speed synchronization contraction Ⅱ, Ⅲ, Ⅳ boom. When the completion of contraction, Ⅳ section boom appeared automatically forward fault, and the failure is more serious, and finally developed to boom extension, contraction are not uncommon. In addition, the crane at 20km / h above the speed of braking, the boom will automatically move forward about 200mm. 2. Analysis of the reasons According to the analysis of the failure phenomenon, it is likely that there are problems with the telescopic cylinder boom. The telescopic crane crane boom structure is more complex multi-stage hydraulic cylinder, by one