First of all, rust prevention. Because the piston part of the hydraulic cylinder manufacturer is to extend the cylinder in the working state, it will naturally be eroded by oxide and acid gas, which requires us to apply an appropriate amount of grease to protect it, so as not to erode the piston as a load-bearing part and break it in the work. Second, open the tank to change the oil. Because of long-term use, it is inevitable that foreign bodies will enter the hydraulic cylinder, so that friction will increase in use, in addition, the hydraulic oil also has a certain service life, a long time without changing the oil will damage or erode the hydraulic cylinder. Liaoning hydraulic cylinder
Hydraulic oil quality The quality of hydraulic oil is an important factor in whether the hydraulic cylinder produces cavitation. Hydraulic oil is inevitably impacted with valves and pipelines in the work. If the anti-foam property of hydraulic oil is poor, it is easy to produce foam, resulting in cavitation of hydraulic cylinder and other parts. If the frequency of hydraulic oil pressure change is too fast and too high, it will also promote the formation of bubbles and accelerate the rupture rate of bubbles. For example, at the inlet and outlet of the hydraulic cylinder, due to the relatively high frequency of pressure change, the degree of cavitation is relatively higher than that of other parts.
The key to the protection system is the pressure relief valve, but the general size is small, the flow rate is small, and the system pressure can not be restored to normal. Therefore, the pressure relief valve built into the hydraulic pump should not be used for system pressure regulation, but should be used as a safety valve in order to prevent the constant power control circuit hydraulic system from being used alone, the constant power speed regulation circuit consists of a constant power pump and a variable motor. Generally speaking, the speed stiffness of the speed regulating circuit is relatively large. However, the rigidity of the circuit is proportional to the square of the displacement of the motor speed, but the discharge of the variable motor is reduced, the rigidity will drop sharply, and the transmission torque will be reduced, so this circuit rarely uses the pipeline pressure loss alone, and the flow of the constant power variable pump can not meet the measurement requirements.
