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Pneumatic Actuators Are More Suitable For Simple Motion Control
Jun 12, 2018

Pneumatic actuators are actuators that use air pressure to actuate the opening and closing or adjustment of valves. They are also called pneumatic actuators or pneumatic devices, but they are generally called pneumatic heads. Pneumatic actuators are also sometimes equipped with auxiliary devices. Commonly used valve positioner and handwheel mechanism. The role of the valve positioner is to use the feedback principle to improve the performance of the actuator so that the actuator can accurately control the signal according to the controller. The function of the handwheel mechanism is to use the controllable valve to directly operate the control valve to maintain normal production when the control system is shut down due to power failure, stop the air flow, no output of the controller, or failure of the actuator.

The type and structure of the adjustment mechanism of the pneumatic actuator are approximately the same, and the actuator is mainly different. Therefore, when the pneumatic actuator is introduced, it is divided into an actuator and a regulating valve. Pneumatic actuator consists of two parts: the actuator and the regulating valve (adjusting mechanism). According to the size of the control signal, a corresponding thrust is generated to push the regulating valve. The regulating valve is the regulating part of the pneumatic actuator. Under the action of the actuator thrust, the regulating valve generates a certain displacement or rotation angle and directly regulates the flow of the fluid.

In modern control, various systems are becoming more and more complex and sophisticated, and it is not a certain drive control technology that can satisfy various control functions of the system. Electric actuators are mainly used in applications where precise control is required. Flexibility requirements in automation equipment are constantly increasing. The same equipment is often required to meet the processing needs of different sizes of workpieces. Actuators need to perform multi-point positioning control and actuators. The precise control or synchronous tracking of the operating speed and torque, which cannot be achieved using conventional pneumatic controls, can be very easily achieved with electric actuators. This shows that pneumatic actuators are more suitable for simple motion control, while electric actuators are mostly used for precision motion control applications.