How to analyze the action errors of hydraulic cylinders
After the hydraulic cylinder has been used for a long period of time, malfunctions or errors may sometimes occur. These are relatively common phenomena. Although the final result is the same, the reasons are different. The common reasons for this phenomenon are:
1. The initial movement of the hydraulic cylinder is relatively slow
2. The control pressure of the hydraulic system of the hydraulic cylinder is too low
3. The valve core is stuck or the valve hole is blocked
4. Sometimes air may enter the hydraulic system
5. The piston rod and cylinder are stuck or the hydraulic cylinder is blocked
The corresponding solutions are:
1. If the temperature is relatively low, the viscosity of the hydraulic oil will be very large, which will make its fluidity worse, which will cause the hydraulic cylinder to slow down. If this happens, it is necessary to replace the hydraulic oil with good viscosity and temperature performance. In addition, it is possible to use heating equipment or the machine's own heating equipment to increase the temperature at start-up under low temperature conditions.
2. Generally, this situation is because the resistance of the throttling in the control pipeline is too large, the adjustment of the flow valve is not very correct, the controlled pressure is not appropriate, and the same inlet pressure source is also disturbed. At this time, check the control pressure source to ensure that the pressure must be adjusted to the value specified by the system.
3. If the spool of the flow valve or the directional valve is stuck or the valve hole is blocked, the hydraulic cylinder is more likely to malfunction or malfunction at this time. If such a situation occurs, check whether the oil is contaminated in time; check whether there is dirt or colloidal deposits that jam the valve core and block the valve hole; and check the degree of wear of the valve body.
4. This situation is mainly due to leakage in the system. At this time, check the position of the liquid in the hydraulic oil tank, the seals and pipe joints on the suction side of the hydraulic pump, and whether the oil suction coarse filter has not been cleaned for a long time. If this is the case, you should add hydraulic oil in time, deal with seals and pipe joints, thoroughly clean or directly replace the coarse filter element.
5. If such a situation occurs, no matter how to operate the hydraulic cylinder, it will not move or move very little. At this time, check whether the seal between the piston and the piston rod is too tight, and then check whether there is dirt or colloidal deposits: check whether the axis of the piston rod and the cylinder barrel are aligned, and whether the wearing parts and seals are intact.