The pneumatic actuator converts the pressure energy of the compressed gas into a pneumatic actuator of mechanical energy. The cylinder has two types of reciprocating linear motion and reciprocating swing (see figure). The cylinders that make reciprocating linear motion can be divided into four types: single acting, double acting, diaphragm type and impact cylinder.
1 Single-acting cylinder: only one end has a piston rod, which can generate air pressure from the side of the piston. The air pressure pushes the piston to generate thrust and returns by spring or self-weight.
2 double-acting cylinder: alternately supply air from both sides of the piston, outputting force in one or two directions.
3 Diaphragm cylinder: replace the piston with a diaphragm, output the force in only one direction, and reset with a spring. Its sealing performance is good, but the stroke is short.
4 Impact cylinder: This is a new type of component. It converts the pressure energy of the compressed gas into the kinetic energy of the high-speed (10-20 m/s) movement of the piston, thereby doing work. The impact cylinder adds a middle cover with a spout and a drain. The middle cover and the piston divide the cylinder into three chambers: a gas storage chamber, a head chamber and a tail chamber. It is widely used in a variety of operations such as blanking, punching, crushing and forming. The cylinder that makes the reciprocating swing is called the swinging cylinder, and the inner chamber is divided into two by the vane, and the two chambers are alternately supplied with air, and the output shaft is oscillated, and the swing angle is less than 280°. In addition, there are rotary cylinders, gas-liquid damping cylinders and stepping cylinders.
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