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Part-Turn Electric Actuator Stable And Reliable
- Aug 07, 2017 -

Electric actuators as a very important on-site drive in industrial process control systems, widely used in power, metallurgy, petroleum, chemical and other industries. In the fluid control, Part-Turn Electric Actuator such as the valve in the operation of the problem, it will be reflected in the electric actuator. So it also has an identity - "the protector of the valve", its role is reflected in the normal use of the valve monitoring, Part-Turn Electric Actuator which is very important point is the torque protection.

As the name suggests, over torque protection means that the electric actuator in the process of running the load torque exceeds the allowable value, should immediately cut off the power or send an alarm signal, and then stop the motor rotation to achieve the protection of the valve while protecting the purpose of the actuator itself The

As a kind of field instrument, Part-Turn Electric Actuator the value of electric actuators is more reflected in the stability, reliability and control accuracy. Part-Turn Electric Actuator With the development of technology, the requirements of the actuator has long been beyond the stability and reliability of the operation, Part-Turn Electric Actuator the control accuracy requirements are getting higher and higher, and over torque protection in the control accuracy occupies a very important position. In China, the development of electric actuators relatively late, Part-Turn Electric Actuator in the torque protection to reflect the more obvious. We tentatively put the development stage according to the development of the situation is divided into three stages: mechanical control over the moment phase, the sensor control over the moment, the sensor control the torque later. In today's rapid technological development, Part-Turn Electric Actuator how will our torque protection go?

China from the late sixties and early seventies began to imitate the former Soviet Union's electric actuators, after 20 years of slow development, to the eighties to produce DKJ-type angle travel, DKZ-type straight electric actuators (China's only production of electric Actuator). At that time, electric actuators in China is still being promoted, only used in a special environment instead of artificial operations, let alone the torque protection function, can only rely on the design of the motor power to ensure the control of the torque. Later introduced the Bernard electric actuator technology, the emergence of the first over torque protection, the control method is the mechanical control of the torque method (later introduced and analyzed on this basis to be improved control over the torque method). Part-Turn Electric Actuator The main components of this way are torque spring, transmission parts, planetary ring gear, torque micro-switch.

Electric actuator with load operation, and the motor connected to the inner ring gear with the torque transmission, according to the transmission torque of the size of the shaft side force of a small deflection, the amplitude of the deflection and the load generated by the torque into Proportional to (specific calculations are omitted here).

 So that once the load exceeds the maximum allowable, Part-Turn Electric Actuator toggle on the outer gear on the outer gear with the balance between the forward and reverse two torque of the two spiral cylindrical spring (referred to as the moment spring components) of the transmission, Part-Turn Electric Actuator the moment The components move around the whole. When the torque is over, the drive drives the connecting rod to touch the torque microswitch in the direction to produce the instantaneous electrical signal. Part-Turn Electric Actuator There is a problem here, if the electric actuator over the moment only alarm, it simply can not meet the actual operation requirements, Part-Turn Electric Actuator it is necessary to use control circuit board dedicated relay to assist in the completion of the electric actuator to stop running.