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Scotch Yoke Pneumatic Actuator Control Loop

发布时间:2019-01-12     来源:艾德威尔•瑞拓
In the actuator, it is usually divided into scotch yoke pneumatic actuator, electric actuator and hydraulic actuator. The operation and use range of each kind of actuator is different because of the different control loops of the actuator. Today, Ruito's small edition will show you the control loops of the pneumatic fork actuator.
1 scotch yoke pneumatic actuator

Actuator is an important part of industrial automation process control system. It receives the control signal from the control unit. By changing the flow area of the control valve and adjusting the flow capacity of the fluid, it can realize the automatic control of the production process. According to the energy used, actuators can be divided into pneumatic, electric and hydraulic types. Pneumatic actuator, as one of the important control instruments, is widely used in petroleum, chemical, electric power, metallurgy and other industrial enterprises.

scotch yoke pneumatic actuator

1.1 Pneumatic Actuator Control Circuit of Fork
Pneumatic actuator takes compressed air as power source, converts input control signal into pneumatic signal and adds it to pneumatic actuator to drive valve, realizes continuous regulation or switching action, and optionally distributes accessories such as pneumatic converter, valve positioner, solenoid valve and holding valve. The control/interlocking circuit is shown in the figure. The industrial automation control system such as DCS control channel performs PID control operation according to AI analog input (flow, pressure, temperature, liquid level etc.). Through AO analog output 4mA-20mA control signal to the electrical valve positioner of the pneumatic actuator, which is converted to the pneumatic signal of positioning control to make the pneumatic actuator perform action. The solenoid valves connected in series in the air circuit are used for safety interlocking control. DCS outputs an interlocking signal through DO digitally to control whether the solenoid valves are charged and then control the air circuit on-off.
Above are some of the contents about the scotch yoke pneumatic actuator, which are arranged for your reference only.
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