Causes and treatment methods of hydraulic cylinder operation failure or action error

The causes and treatment methods of hydraulic cylinder operation failure or action error are as follows:

The valve core is stuck or the valve hole is blocked. When the flow valve or direction valve spool is stuck or the valve hole is blocked, the hydraulic cylinder is prone to malfunction or action failure. At this time, check the oil pollution; Check whether dirt or colloidal sediment sticks to the valve core or blocks the valve hole; Check the wear of the valve body.

The piston rod is stuck with the cylinder barrel or the hydraulic cylinder is blocked. At this time, no matter how you operate, the hydraulic cylinder will not act or act very little. At this time, check whether the piston and piston rod seal is too tight, whether dirt and colloidal sediment enter; whether the axis line of piston rod and cylinder barrel is aligned, and whether vulnerable parts and seals fail.

The hydraulic system control pressure is too low. The throttling resistance in the control pipeline may be too large, the flow valve may not be adjusted properly, the control pressure may not be appropriate, and the pressure source may be disturbed. At this time, check the control pressure source to ensure that the pressure is adjusted to the specified value of the system.

Air enters the hydraulic system. Mainly because there is leakage in the system. At this time, check the liquid level of the hydraulic oil tank, the seals and pipe joints on the oil suction side of the hydraulic pump, and whether the oil suction strainer is too dirty. If so, add hydraulic oil, deal with seals and pipe joints, and clean or replace the primary filter element.

The initial action of hydraulic cylinder is slow. In the case of low temperature, the hydraulic oil has high viscosity and poor fluidity, resulting in slow action of the hydraulic cylinder. The change method is to replace the hydraulic oil with good viscosity temperature performance. Under low temperature, the oil temperature at startup can be increased by means of heater or heating by the machine itself.