Causes and solutions of hydraulic cylinder malfunction or malfunction

A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It is widely used in hydraulic systems of various machines. However, in its use, there will be a phenomenon of malfunction or malfunction, so what is the reason for this phenomenon? What is the solution? Let me give you a detailed introduction:

　　 1. The valve core 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.

　　Solution: Check the contamination of the oil; check whether the dirt or colloidal deposits are stuck to 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 is stuck with the cylinder or the hydraulic cylinder is blocked. At this time, no matter how it is manipulated, there is no action or little action.

Solution: Check whether the seal of the piston and the piston rod is too tight, whether it enters the dirt and colloidal deposits: whether the axis line of the piston rod and the cylinder is aligned, whether the wearing parts and seals are invalid, and whether the load is loaded Too big.

　　 3. The control pressure of the hydraulic system is too low. Throttle resistance in the control line may be too large, the flow valve is improperly adjusted, the control pressure is inappropriate, and the pressure source is disturbed. Solution: Check the control pressure source to ensure that the pressure is adjusted to the specified value of the system.

　　 4. Air in the hydraulic system. Mainly because of a leak 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 coarse filter is dirty.

　　Solution: hydraulic oil should be added, seals and pipe joints should be handled, and the coarse filter element should be cleaned or replaced.

　　 5. The initial action of the hydraulic cylinder is slow. When the temperature is low, the viscosity of the hydraulic oil is large and the fluidity is poor, which causes the hydraulic cylinder to move slowly.

　　Solution: replace the hydraulic oil with better viscosity and temperature performance. At low temperature, you can use the heater or the machine to heat it to increase the oil temperature at startup. The normal working oil temperature of the system should be maintained at about 40 ℃.

　　The above is about the cause and solution of hydraulic cylinder malfunction or malfunction. I hope that the above explanation can help you better deal with this problem.