Pneumatic is the use of air pressure generated by impact or rotation to make it move or perform work. Pneumatic is to use compressed air as a power source to drive machinery to complete telescopic or rotating actions. Because it uses the compressibility of air, the air is compressed and stored, and the air has an elastic force like a spring, and then the control element is used to control its direction to drive the rotation and expansion of the actuator. How much air is inhaled from the atmosphere will be discharged into the atmosphere, no chemical reaction will occur, and no components of polluted air will be consumed. In addition, the viscosity of gas is smaller than that of liquid, so the flow speed is fast, and it is also very environmentally friendly.