Electric actuator habit is called electric actuator, it is a kind of can provide linear or rotary motion drive device, it uses some kind of drive energy and work under the action of some kind of control signal. Electric actuators can be divided into two categories: straight stroke and angular stroke. It is an indispensable and important equipment in the automatic control system. Its main task is to convert the control signal sent by the regulator into linear displacement or angular displacement in proportion. Drive valves, baffles and other regulating mechanisms to achieve automatic control. Therefore, it is widely used in the automatic control field of electric power, metallurgy, petroleum, chemical and other industrial sectors. Although the electric actuator has wide application and obvious advantages, it also has certain disadvantages.

Advantages:

Convenient access to energy, fast signal transmission speed, long transmission distance, convenient centralized control, high sensitivity and precision, convenient coordination with electric adjustment instruments, simple installation and wiring. The anti-deviation ability of the electric actuator is very good, the output thrust or torque is basically constant, which can well overcome the unbalanced force of the medium and achieve accurate control of the process parameters, so the control accuracy is higher than that of the pneumatic actuator. If equipped with a servo amplifier, it is easy to realize the exchange of positive and negative effects, and it is also easy to set the off signal valve position state (keep/Fully open/Fully Off)When it fails, it must stay in place, which is not done by pneumatic actuators. Pneumatic actuators must be protected by means of a combined protection system.

Disadvantages:

The structure is more complex, the thrust is small, and the average failure rate is higher than that of the pneumatic actuator. It is suitable for places where the explosion-proof requirements are not high and the gas source is lacking. It is more prone to failure, and due to its complexity, the technical requirements for on-site maintenance personnel are relatively higher. The operation of the motor needs to generate heat. If the adjustment is too frequent, it is easy to cause the motor to overheat and generate thermal protection. At the same time, it will increase the wear of the reduction gear. In addition, the operation is slow, from the output of a signal from the regulator to the corresponding position in response to the regulating valve, it takes a long time, which is where it is inferior to pneumatic and hydraulic actuators.

The advantages and disadvantages of the electric actuator directly affect its operating performance, and understanding its advantages and disadvantages can skillfully overcome some operating failures.

(1) Debugging phase failure

Common faults are serious leakage, difficult to adjust the speed of stability, dirt or oil so that the transmission mechanism jam or action failure. Some components are missing or incorrectly installed springs and seals, as well as improper design, improper selection of components, unstable movement, poor positioning accuracy, etc. Such faults should be treated patiently, carefully and carefully, and eliminated one by one.

(2) Early and mid-operation failures

The fault characteristics of entering the normal production stage after debugging are: a few seals leak oil due to short-term damage to assembly quality and material quality problems; The burrs, sticky sand, impurities and dirt originally adhered to the pipe wall and hole wall fall off, resulting in unstable operation of some components.

(3) Late operation failure

After electric execution and operation for a period of time, various components/components are worn out due to differences in operating frequency and load conditions. The fault characteristics of this stage are poor contact of position feedback, poor positioning accuracy, decreased stability, significantly reduced efficiency, and gradually increased failure rate. At this time should be a comprehensive inspection, replacement of failed parts, should not make do, deal with ideas, should be scientific, strict underground determination to invest, to be a comprehensive repair, otherwise it may bring a lot of trouble to the operator, and even seriously affect the normal adjustment and control of the unit.