The difference between pneumatic cylinder and oil cylinder

1. The working principle is different:

The working pressure of the pneumatic system of the pneumatic cylinder is generally in the range of 0.2-1.0 MPa, so the pneumatic cylinder cannot be used as a high-power power component. Hydraulic cylinders are different, hydraulic cylinders can be used as components with relatively large power. After the cylinder is pressed in, the surface roughness of the hole is reduced from Ra3.2~6.3μm before rolling to Ra0.4~0.8μm.

All cylinders are composed of five basic parts, piston and piston rod; exhaust device; cylinder and cylinder head; sealing device; buffer device. The working principle of the oil cylinder is similar to that of the air cylinder. By manually pressurizing the valve stem (hydraulic manual pump), the hydraulic oil can enter the cylinder through the one-way valve.

2. From the point of view of the media, air can be inexhaustible without additional costs and difficult supply costs. The used gas can be directly discharged into the atmosphere, which is easy to handle and will not be polluted, while the hydraulic oil is the opposite. Hydraulic cylinders can work normally with hydraulic oil. Hydraulic oil is a non-renewable resource and cannot be recycled. Used hydraulic oil will have an impact on the environment.

3. From the perspective of the working resistance of the hydraulic cylinder and the air cylinder, the third difference between the hydraulic cylinder and the air cylinder is that the air viscosity is small and the resistance will be smaller than that of the hydraulic oil.

4. In terms of resource utilization efficiency, the fourth difference between hydraulic cylinders and pneumatic cylinders is that the compression ratio of air is much greater than that of hydraulic oil, so its working stability and responsiveness are much worse.