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1.故障现象我公司于冬季对某型挖掘机进行批次产品出厂检验,在对1台挖掘机进行空载操纵性能测试时,该机斗杆缸出现卡滞和停顿故障。具体情况是:发动机处于小油门状态,操纵斗杆从高到低做收回动作(斗杆缸活塞杆伸出),当斗杆下降到某个位置时,斗杆缸开始卡滞和停顿,斗杆收回动作不连续,产生了严重的颤动,并带动整机前、后剧烈晃动。斗杆缸卡滞和停顿过程中,可听见斗杆缸发出清脆的“咔咔”声。该挖掘机斗杆卡滞和停顿情况如图1所示。
1. Symptom My company in the winter of a batch excavator excavator factory inspection, in an excavator for no-load handling performance test, the aircraft arm cylinder stalled and pause failure. Specific situation is: the engine is in a small throttle state, the manipulation of the arm to do back and forth from high to low action (stick cylinder rod stick out), when the stick down to a certain position, the stick cylinder began to stagnate and pause bucket Rod recovery action is not continuous, resulting in severe chatter, and lead the machine before and after the violent shaking. Arm cylinder stuck and pause, you can hear the arm cylinder issued a crisp “Kaka ” sound. The excavator stick stuck and pause situation shown in Figure 1.