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The application of pneumatic actuator is quite common, many machines are equipped with pneumatic actuators system, in the industry in various fields, such as machinery, electronics, steel, vehicles and manufacturing operation, rubber, textile, chemical, food, packaging, printing and tobacco machinery, pneumatic actuator technology is not only has been widely used in various industrial fields, and, in the field of cutting-edge technologies such as the nuclear industry and aerospace, pneumatic actuator technology also occupies the important position.
A, the working principle of pneumatic actuator system
The working principle of pressure system is under pneumatic actuator usage in field, using air compressor to transform mechanical energy output at the motor or other prime mover into the air pressure, and then under help of the control element and with the cooperation of auxiliary components, the components of the air through the pressure can be transformed into mechanical energy, thus complete linear or rotary movement and work abroad.
Second, the composition of pneumatic actuator system
A typical pneumatic actuator system, as shown in figure 10.1.1. is generally consists of the following four parts: 1. The generator it will be transformed into mechanical energy output at the prime mover of the air pressure can.The main equipment is the air compressor. 2. The control element is used to control the compressed air pressure under pneumatic actuator usage in field, flow rate and flow angle, in order to guarantee the output force and speed of the electric actuators have certain and normal work according to the design of the procedure. Such as pressure valve, flow valve, direction valve and logic valve, etc. 3. The control element is a device to transform the air pressure into mechanical energy conversion under pneumatic actuator usage in field. 4. Auxiliary element is used for auxiliary to guarantee the normal work of the air system. Such as filter, dryer, air filter, muffler and oil mist detector, etc.
The characteristics of pneumatic actuator
First, the advantages of air-pressure transmission
1. Taking the air as the working medium makes it a convenient sources, after using the exhaust process is simple and will not pollute the environment. 2. Due to the loss of the air flow is small, compressed air and gas can be centralized supplied and can be transmitted over a long distance. 3. Compared with hydraulic drive, the start action has many advantages like fast response, simple maintenance, line is not easy to jam, and there is no medium metamorphism, supplement and replacement, and other issues. 4. Pneumatic actuator usage in field has good adaptability to the environment; it can be safely and reliably used in inflammable and explosive places. 5. Stress level is low so it is safe to use it. 6. Air has compressibility; pneumatic system can realize automatic overload protection.
Second, the characteristics of pneumatic actuator
1. Because the air has compressibility, so the action of cylinder speed can be easily affected by load.2. working pressure is low(typically 0.4 Mpa to 0.8 Mpa), so the pneumatic system output force is small. 3. The pneumatic system has larger exhaust noise. 4. The air as the working medium itself has no lubrication, so we need other subjects for oil lubrication.