Hydraulic cylinder malfunction reasons

Hydraulic cylinder is the hydraulic system will be converted to mechanical energy hydraulic actuator. The failure can be basically summarized as a hydraulic cylinder malfunction, unable to promote the load and the piston slipping or crawling. As the hydraulic cylinder failure caused by the phenomenon of equipment downtime is not uncommon, therefore, should pay attention to the hydraulic cylinder fault diagnosis and use of maintenance work. The following is the hydraulic cylinder malfunction or malfunction causes and treatment methods, the following:

(1) The spool is stuck or the valve hole is clogged. When the flow valve or directional valve spool stuck or the valve hole is blocked, the hydraulic cylinder prone to malfunction or malfunction. At this point should check the oil pollution; check dirt or gum sediment stuck valve plug or plug the valve hole; Check the body of the wear and tear.

(2) The piston rod is stuck with the cylinder or the cylinder is clogged. No matter how the manipulation at this time, the hydraulic cylinder is not action or action is minimal. Should check the piston and piston rod seal is too tight, whether to enter the dirt and plastic deposits: the piston rod and cylinder axis alignment, consumables and seals are invalid.

(3) hydraulic system control pressure is too low. Throttling resistance in the control line may be too large, the flow valve is not properly adjusted, the control pressure is not suitable, and the pressure source is disturbed. At this point, check the control pressure source to ensure that the pressure is adjusted to the system's specified value.

(4) into the hydraulic system of air. Mainly because there is a leak in the system. At this point should check the level of the hydraulic tank, hydraulic pump suction side of the seal and pipe joints, oil strainer is too dirty. If so, replenish the hydraulic oil, handle seals and fittings, clean or replace the coarse filter.

(5) hydraulic cylinder initial action is slow. In the case of lower temperature, hydraulic oil viscosity, poor fluidity, resulting in slow cylinder movement. The remedy is to replace the hydraulic oil with better viscosity-temperature performance and to heat the oil at startup by using a heater or by using the machine itself.