Drivers are key components of automatic control systems. Its main function is to receive control signals from the controller, thereby changing the size of the controlled environment and maintaining the control values within the required values or ranges. Drive can be divided into three categories: pneumatic, hydraulic, and electric, depending on their energy form.
Pneumatic transmission
Pneumatic drive uses compressed air as energy source, which has the advantages of simple structure, reliable operation, high output thrust, easy maintenance, fire and explosion prevention, etc. Widely used in production processes such as chemical engineering, papermaking, and oil refining. Pneumatic drives are typically equipped with valve positioners and manual backup mechanisms.The valve positioner improves driving performance through feedback principle. When the control system cannot guarantee normal production, the flywheel mechanism can be manually controlled.
Electric transmission
Electric drives use electricity as energy source and can quickly transmit signals, but their design is complex and their explosion-proof performance is poor. The electrical driver receives instructions and signals from the electrical control cabinet and activates the corresponding mechanism. Common types include DC motors and AC asynchronous motors. Asynchronous AC motors have advantages such as contactless switching, no arc, no spark, and long service life, but they also have disadvantages such as high noise and environmental requirements.
Hydraulic transmission
Hydraulic drive is rarely used in production processes such as chemical and oil refining, but its output thrust is significant. The working principle of hydraulic drive is that the hydraulic cylinder pushes the piston rod into reciprocating motion, thereby achieving changes in working volume and achieving the required control objectives.
