Fault diagnosis and treatment of hydraulic cylinder
1. Malfunction or malfunction can also cause hydraulic cylinder failure
The reasons and treatment methods are as follows:
(1) The valve core of the hydraulic cylinder is stuck or the valve hole is blocked. When the flow valve or directional valve spool is stuck or the valve hole is blocked, the hydraulic cylinder is prone to malfunction or malfunction. At this time, check the contamination of the oil; check whether dirt or colloidal deposits are stuck in the valve core or block the valve hole; check the wear of the valve body, clean and replace the system filter, clean the oil tank, and replace the hydraulic medium.
(2) The piston rod of the hydraulic cylinder is stuck with the cylinder or the hydraulic cylinder is blocked. At this time, no matter how you manipulate it, the hydraulic cylinder does not move or move slightly. At this time, check whether the piston and piston rod seals are too tight, whether dirt and colloidal deposits have entered: whether the axis line of the piston rod and the cylinder barrel is aligned, whether the wearing parts and seals are invalid, and whether the load is too large. Big.
(3) The control pressure of the hydraulic cylinder hydraulic system is too low. The throttling resistance in the control pipeline may be too large, the flow valve is improperly adjusted, the control pressure is inappropriate, and the pressure source is disturbed. At this time, check the control pressure source to ensure that the pressure is adjusted to the specified value of the system.
(4) Air enters into the hydraulic cylinder hydraulic system. Mainly because there are leaks in the system. At this time, check the hydraulic cylinder's liquid level, the seals and pipe joints on the suction side of the hydraulic pump, and the oil suction strainer to see if it is too dirty. If so, hydraulic oil should be added, seals and pipe joints should be treated, and the coarse filter element should be cleaned or replaced.
(5) The initial movement of the hydraulic cylinder is slow. In the case of low temperature, the hydraulic oil has high viscosity and poor fluidity, which causes the hydraulic cylinder to move slowly. The improvement method is to replace hydraulic oil with better viscosity and temperature performance. At low temperatures, use a heater or use the machine to heat it to increase the oil temperature at startup. The normal operating oil temperature of the system should be maintained at about 40°C.
