液压缸和液压马达等液压执行机构欠速有两种情况:一是快速运动(快进)时速度不够快,不能达到规定值;二是负载下工作速度随负荷的增大显著降低。欠速影响工作效率,大负载下常会出现停止运动的情况,它直接影响整机正常工作。1.产生欠速的原因快速运动时速度不够高的原因:液压泵的输出油量或输出压力达不到规定值;溢流阀因弹簧永久变形、错装成弱弹簧,主阀阀芯阻尼孔被局部堵塞、主阀阀芯卡死在小开口的位置,均会造成液压泵输出的压力油部分流 Hydraulic cylinders and hydraulic motors and other hydraulic actuators under speed in two cases: First, fast movement (fast forward) when the speed is not fast enough, can not achieve the required value; Second, the load speed increases with load significantly reduced. Under-speed affect the work efficiency, often under heavy load to stop the situation, it directly affects the normal work of the machine. 1. Causes of lack of speed due to rapid movement speed is not high enough reason: the hydraulic pump output or output pressure does not meet the required value; overflow valve due to permanent deformation of the spring, wrong into a weak spring, the main valve spool damping Hole is partially blocked, the main valve spool stuck in a small opening position, will result in part of the hydraulic pump output pressure oil flow