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One of the executive components of the hydraulic system is the hydraulic cylinder, which is responsible for linear lifting or telescoping. It is characterized by light weight, high power, simple structure, convenient maintenance, low motion inertia, frequent reversing, and easy remote control. Hydraulic cylinders have been widely used in many types of machinery.
The following uses a double-acting single-piston hydraulic cylinder as an example to analyze the conversion of hydraulic energy into mechanical energy of piston linear motion. The so-called input hydraulic energy refers to the flow and pressure of the input liquid, and the output machinery is the speed and traction of the piston when it moves linearly. All these parameters are realized by the change of the working volume, so the hydraulic cylinder is a positive displacement actuator.
In order to meet the different needs of various machinery, hydraulic cylinders have a variety of structures and different performances. According to their hydraulic pressure, they can be divided into single-acting hydraulic cylinders and double-acting hydraulic cylinders. According to their structural characteristics, they can be divided into columns. Plug hydraulic cylinders and piston hydraulic cylinders, telescopic hydraulic cylinders and swing hydraulic cylinders, all said that the hydraulic cylinder is the heart of the elevator, so how do we maintain the hydraulic cylinder?
First, it is necessary to prevent rust: because the piston part of the hydraulic cylinder needs to extend out of the cylinder in the working state, it will naturally be corroded by oxides and acid gases, which requires us to coat it with an appropriate amount of grease for protection , So as to prevent the piston as a load-bearing component from being corroded and may break during work. Second, open the box to replace the hydraulic oil: because of long-term use, it is inevitable that foreign matter will enter the hydraulic cylinder, so that friction will occur during use In addition, the hydraulic oil also has a certain service life. If the oil is not changed for a long time, it will damage or corrode the inside of the hydraulic cylinder. If the hydraulic cylinder is to be used for a longer time, the speed should be controlled appropriately during the work of the hydraulic cylinder, and it should not exceed 2m. /s, this can prolong the service life of the hydraulic cylinder. In addition, in order to protect the mechanism and safety, the internal buffer device is very effective for the protection of the hydraulic cylinder.

Because the hydraulic cylinder has to withstand a lot of pressure, the heavier the load, the greater its pressure will be. Therefore, the maintenance of the hydraulic cylinder is the most important part of the maintenance of the entire hydraulic system. Moreover, the hydraulic cylinder is equivalent to The heart of the hydraulic system, heart problems are difficult to repair, so the maintenance of hydraulic cylinders must be cautious.