Pneumatic Actuator Structure

An actuator structure, comprising:

• a first-half cylinder;
• a second-half cylinder, which is made respectively in the same mold as the first-half cylinder and when the first-half cylinder and the second-half cylinder are engaged with each other, a complete actuator is formed, wherein each of the first-half cylinder and the second-half cylinder has an air reservoir chamber and a vane chamber, and a dividing unit is located between the air reservoir chamber and the vane chamber to form an angle of between 110 and 130 degrees in the vane chamber which has protruding arc portions to reduce the volume and to focus the effective moving area of the vane on one of the blades thereof, and the vane is located in the vane chamber, wherein a first channel groove and a second channel groove are formed at an interface of the first-half cylinder and the second-half cylinder, to connect a first air inlet hole and a second air inlet hole (at periphery of the first-half cylinder and the second-half cylinder), and a left-side wall and a right-side wall of the vane chamber, wherein one or more grooves for a O-shaped ring to prevent leakage are formed at a surface of the vane, both sides of a vane axis and a lateral surface of the vane axis closed to the dividing unit;
• and
• a fail-safe control structure, including an air source connected to a non-return valve and a first control side of an air driving valve, and the non-return valve is connected to the air reservoir chamber of the actuator, while the air reservoir chamber containing high-pressure gas is connected to an air inlet end of the air driving valve, and the air driving valve has a second control side which has a spring, wherein the first output end of the air driving valve is connected to a second air inlet hole through a first channel and connected to a right-side wall of the vane chamber through the second channel groove, while a second output end of the air driving valve is connected to a first air inlet hole through a second channel and connected to a left-side wall of the vane chamber through the first channel groove, wherein the air source provides air to drive the air driving valve and the vane, and when the air source does not provide air, the spring rebounds to actuate the air driving valve;
• and the high-pressure air in the air reservoir chamber drives the vane and safely restore it by switching movement to change the inlet air position.