A pneumatic actuator is a pneumatic actuator that performs continuous rotary motion. It is an energy conversion device that converts the pressure energy of compressed air into reverse mechanical energy. Its effect is equivalent to an electric motor or a hydraulic motor. It outputs torque and drives the execution. Tissue for rotational movement. Geared air motors, vane and piston types are widely used in pneumatic transmission. Pneumatic actuator is a prime mover with compressed air as the working medium. It is a power device that uses the expansion of compressed gas to convert pressure energy into mechanical energy. It is also called a pneumatic motor.
Although various types of pneumatic actuators have different structures and working principles, most pneumatic actuators have the following characteristics:
Stepless speed regulation is possible. As long as the opening of the intake valve or the exhaust valve is controlled, that is, the flow of compressed air is controlled, the output power and speed of the motor can be adjusted to achieve the purpose of adjusting the speed and power.
Can turn forward or reverse. Most pneumatic actuators can realize forward and reverse rotation of the output shaft of the air motor, and can reverse the direction instantaneously. During forward and reverse transitions, the shock is small.
There is a regulating valve on the pneumatic actuator. You can see if it has been opened to the maximum. If it is, the pressure of the signal air source or the diameter of the pipe can also be considered within a certain range. In addition, increase the air source pressure and the size of the air source pipe, increase the corresponding cylinder hole, and then speed up the exhaust valve, which will increase his opening speed.
In fact, when the valve is equipped with a pneumatic actuator, the switching time requirements of the valve should be considered, and attention should be paid to the open and closed torque of the valve and the open and closed torque under pressure. Under the premise of considering the safety factor of the torque, consider the air intake and Exhaust speed, consider increasing the pipe diameter and the selection of air control valve and quick exhaust valve on the exhaust pipe and pneumatic accessories!
Pneumatic actuators are sometimes equipped with corresponding auxiliary equipment. Commonly used are valve positioners and handwheel organizations. The effect of the valve positioner is to use the feedback principle to improve the performance of the actuator, so that the actuator can achieve accurate positioning according to the control signal of the controller.
The effect of the handwheel mechanism is to use it to directly operate the control valve to maintain normal production when the control system is powered off, gas out, the controller has no output or the execution mechanism fails.
