The past 20 years, the air industry has developed rapidly. 70 years, the output value of hydraulic and pneumatic components ratio of about 9:1,20 years later, in the industrial technology developed in Europe and America, Japan and other countries, the ratio has reached 5:4, or even close to 5:5. The pneumatic components of the price cheaper than the hydraulic components, the output value in the same circumstances, the use of pneumatic components and the use of far more than the hydraulic industry. China's reform and opening up, the air industry has developed rapidly. 1986 to 1993, the pneumatic components of the annual growth rate of output of 24.2%, higher than the average annual output value of China's machinery industry growth rate of 10.5% level. 1996 National Air industry output of about 6 000 million U.S. dollars. Looking at the world air industry trends, trends in the development of pneumatic components can be summarized as the following: (1) high quality. Cylinder life up to (2 000 ~ 5 000) km. (2) precision. Positioning accuracy (0.05 ~ 0.1) mm, filtration precision of up to 0.01μm, the standard oil removal rate of up to 1 m3 of oil mist in the atmosphere in the 0.1 mg or less. (3) high speed. Valve frequency up to tens of Hz, the maximum cylinder speed of up to 3 m / s. (4) smaller. Components made of ultra-thin, ultra-short, ultra-small. Such as the 2.5 mm bore single-acting cylinder; bore 6 mm double-acting cylinder; M3 fittings for the connection and 2 mm diameter tubes. (5) Light weight. Aluminum and plastic components and other new materials, has re-emerged 0.1N low-power solenoid valve. (6) non-oil based. No oil lubrication system composed of components do not pollute the environment, the system is simple, maintenance is simple, save oil, and friction performance, stability, suitable for food, medicine, electronics, textiles, precision instruments, bio-engineering and other industries. (7) composite integration. Reduce the wiring, piping and components to save space, simplify assembly and disassembly, and enhance efficiency. (8) machine electrical integration. Typical is the "programmable controller + sensor + pneumatic components," composed of the control system.
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