What is the function of an actuator? What is the difference between a controller and an actuator

Actuators are automatic control systems.

is an essential and important component. Its function is to accept the control signal sent by the controller and change the size of the controlled medium, so as to maintain the controlled variable at the required value or within a certain range.

Actuators can be divided into three categories: pneumatic, hydraulic and electric according to their energy form. Pneumatic actuators use compressed air as an energy source, which is characterized by simple structure, reliable action, stable action, large output thrust, convenient maintenance, fire and explosion protection, and low quality, so it is widely used in chemical, papermaking, oil refining and other production processes, it can be easily used with passive instruments. Even when using an electric meter or computer control, the electrical signal is converted into a standard air pressure of 20-100 kPa by passing through an electric-pneumatic converter or electro-pneumatic valve positioner.

Signals, pneumatic actuators are still available. Electric actuators.

The energy access is convenient and the signal transmission is rapid, but the structure is complex and the explosion-proof performance is poor. Hydraulic actuators are basically not used in the production process of chemical industry, oil refining, etc., and it is characterized by a large output thrust.

The actuator can comprehensively and effectively manage the customer's information and resources, and can manage some information that is competitive with the market. You can grasp the opportunities and lines in sales throughout the process.

Receives control signals from the controller.

The controller is the human brain. An actuator is the equivalent of a human hand. The main links include giving, conversion, calculation, detection, feedback, output and so on. Its characteristics and functions can be understood from the literal meaning of the name of the link.

in the automatic control system.

The actuator is the hand and is able to apply the instructions given by the control system to the corresponding components.

Controller: The main command device that can change the wiring of the main circuit or control circuit and change the resistance value in the circuit to control the start, speed regulation, braking and reverse of the motor according to the predetermined sequence.

Actuator: The use of liquid, gas, electricity or other energy sources and the use of motors, cylinders or other devices to turn the wheel track into a driving effect.

1. The actuator is a device that adjusts the input amount of the controlled object according to a certain adjustment law in the automatic control system of the industrial production process, which takes the signal of the adjusting instrument or other control devices as the input signal. It is an industrial automation instrument, such as regulating valves, baffles and solenoid valves.

2. an operator. An operating mechanism composed of a series of joints or relative movements, which can imitate the movements of the human hand. It is an important part of all kinds of robots, generally driven by cylinders, cylinders or motors and other drives, and completes several degrees of freedom in the car space, so that the grasping device mounted on the end joint of the operator can grasp objects or move objects and complete certain operation operations.

Dear landlord:

Actuators are available in double-acting and single-acting.

The selection of double-acting double-acting actuators is the tolerance of the inner DA series pneumatic actuators. The output torque of the rack actuator is obtained by multiplying the piston pressure (supplied by the air source) by the radius of the pitch circle (the arm), as shown in Figure 4. And the friction resistance is small and the efficiency is high.

Single-acting. The selection of single-acting actuator takes SR series pneumatic actuator as an example, in the application of spring return, the output torque is obtained in two different operation processes, and two different torque values are generated in each operation according to the stroke position. The output torque of the spring return actuator is obtained by multiplying the force (air pressure or spring force) by the force armThe first condition: the output torque is obtained by the air pressure entering the middle cavity after compressing the spring, which is called"The air stroke outputs torque"In this case, the air supply pressure forces the piston from 0 degrees to the 90 degree position, and due to the reaction force generated by the spring compression, the torque gradually decreases from the maximum value at the starting point until the second condition:

The output torque is obtained by the spring recovery force acting on the piston when the middle cavity is out of gas, which is called"The spring stroke outputs torque"In this case, due to the elongation of the spring, the output torque gradually decreases from 90 degrees to 0 degrees, as mentioned above, the single-acting actuator is designed on the basis of generating a balanced moment in both cases.

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Positive and negative action of pneumatic actuator (or regulating valve): zhi

Positive effect: When the input signal increases, the plate opening of the DAO actuator increases, that is, the flow rate through the executor increases. This type of pneumatic control valve is often referred to as an air-open valve.

Reaction: When the input signal increases, the opening of the actuator decreases, that is, the flow through the actuator decreases. This type of pneumatic control valve is often referred to as an air shut-off valve.

Positive and negative effects of pneumatic actuators:

Positive action: When the signal pressure from the controller (or valve positioner) increases, the valve stem moves downward.

Reaction: When the signal pressure from the controller (or valve positioner) increases, the valve stem moves upwards.

Positive and negative effects of the control mechanism (formal or reverse):

Positive action (formal installation): When the valve body is upright and the actuator is above, if the flow area between the valve core and the valve seat decreases when the valve stem moves downward, it is called formal installation.

Reaction (reverse installation): When the valve body is upright and the actuator is above, if the flow area between the valve core and the valve seat increases when the valve stem moves downward, it is called reverse installation.

Sensors are the equivalent of human sensations and the like.

The actuator is equivalent to the actuator that the person makes after feeling it, after being processed by the brain, to make an actuator, such as a muscle, to move.

The principle of electric actuators, the working principle of electric actuators.

Popular saying: electric actuator = electric actuator.

Textbooks and other textbooks refer to: electric actuator = electric actuator + valve body.

Because there are many types of valve bodies: straight-through valves, butterfly valves, ball valves, gate valves, etc.

Electric actuator + various valve bodies form another type of product - electric control valve (can also be subdivided into: electric control straight valve, electric control butterfly valve, electric control ball valve and so on).

Therefore, it is customary to refer to an electric actuator and not a valve body.

The electric actuator is composed of a motor, a deceleration mechanism, a limiting mechanism, an over-torque protection mechanism and a position feedback device.

The electric actuator uses the motor as the driving source and the DC current as the control and feedback signal.

When the upper instrument or computer sends out the control signal, the electric actuator acts in proportion to the signal size, makes the valve or damper open to the corresponding opening through the output shaft, and feeds back the system opening signal back to the control room, so as to complete the adjustment function of the system.

The electric actuator can also be used with an operator, servo amplifier and other instruments.

The role of the operator is:

a.Transmit signals to provide the operator with visual input and feedback signal values in the control room, which is convenient for observing the valve position in the field.

b.When the control signal fails or the system is overhauled, it can be used to directly operate the electric actuator to complete the manual operation in the case of accident maintenance.

The servo amplifier (i.e., the position locator) is used to:

Signal amplification, it accepts the control signal of 4-20mA, amplifies the signal into a strong electrical signal that can control the forward and reverse rotation of the motor, and controls the actuator to achieve forward or reverse rotation.

The servo amplifier has two modes for customers to choose from:

a.One is the control board of the actuator itself with servo amplifier function, compact structure, does not need to occupy the space behind the dashboard, and the installation and debugging are relatively simple (i.e., electronic integration).

b.The other is a separate positioner, which is mounted behind the instrument panel, which is a more traditional application method and is easier to service and replace (i.e., discrete proportional adjustment type).

The electric actuator is connected to various valve bodies to form various regulating valves.

Electric actuator: Manually controlled operation.

Hebei Huasheng Environmental Protection Accessories Company replied: Electric actuator, also known as electric actuator, is mainly used to control the valve and form an electric valve. It can install ball valves, butterfly valves, gate valves, etc.

Electric actuators control their operation through various currents, while pneumatic actuators use air pressure to control their operation, and they differ in the industrial fields of application. The environmental requirements of electric actuators are lower than those of pneumatic ones, and pneumatic actuators are safer than electric actuators in some fields (for example, some industries require that electric ones cannot be used if they cannot be interfered with by magnetic fields).