论文部分内容阅读
1.故障现象我们单位一台 ZL50装载机,大修后试车时发现,动臂落到底而拉住动臂下落手柄时,动臂严重抖动。经观察,发现动臂抖动时左边的动臂缸活塞杆在缸筒内上下窜动,窜动量达26 mm。分析原因是,左边的动臂缸活塞不能正常到达缸底。操作时,将操纵杆扳到落臂位置,此时活塞在不断增大的油压作用下到达缸底,液压缸上腔油压继续增大,当压力升高到14 MPa(溢流阀调定压力)
1. Symptom We unit a ZL50 loader, after overhauling the test found that the boom fell to the end and grab the arm drop handle, boom severe jitter. After the observation, it was found that the boom cylinder rod on the left in the arm jerk moved up and down in the cylinder tube with a displacement of 26 mm. Analysis of reasons is that the left of the boom cylinder piston can not normally reach the bottom of the cylinder. In operation, pull the lever to the drop arm position, at which point the piston reaches the bottom of the cylinder under the increasing hydraulic pressure and the hydraulic pressure in the upper chamber of the hydraulic cylinder continues to increase. When the pressure rises to 14 MPa Set pressure)