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5、输出压力异常
Rexroth泵的输出压力是由负载决定的,与输入转矩近似成正比。输出压力异常有两种故障。
(1)输出压力过低
当Rexroth泵在自吸状态下,若进油管路漏气或系统中液压缸、单向阀、换向阀等有较大的泄漏,均会使压力升不上去。这需要找出漏气处,紧固、更换密封件,即可提高压力。溢流阀有故障或调整压力低,系统压力也上不去,应重新调整压力或检修溢流阀。如果Rexroth液压泵的缸体与配流盘产生偏差造成大量泄漏,严重时,缸体可能破裂,则应重新研磨配合面或更换Rexroth液压泵。
(2)输出压力过高
若回路负载持续上升,泵的压力也持续上升,当属正常。若负载一定,泵的压力超过负载所需压力值,则应检查泵以外的液压元件,如方向阀、压力阀、传动装置和回油管道。若最大压力过高,应调整溢流阀。
6、振动和噪声
振动和噪声是同时出现的。它们不仅对机器的操作者造成危害,也对环境造成污染。
(1)机械振动和噪声
如泵轴和电机轴不同心或顶死,旋转轴的轴承、联轴节损伤,弹性垫破损和装配螺栓松动均会产生噪声。对于高速运转或传输大能量的泵,要定期检查,记录各部件的振幅、频率和噪声。如泵的转动频率与压力阀的固有频率相同时,将会引起共振,可改变泵的转速以消除共振。
(2)管道内液流产生的噪声
进油管道太细、进油滤油器通流能力过小或堵塞、进油管吸入空气、油液豁度过高、油面过低吸油不足和高压管道中产生液击等,均会产生噪声。因此,必须正确设计油箱,正确选择滤油器、油管和方向阀。
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