Electric Actuator
Overview
The new generation of AK3 series multi-turn (linear-turn) electric actuators adopts a direct connection structure and can be easily matched with valves. It is suitable for valves whose discs run in a straight line, such as gate valves, globe valves, diaphragm valves, water gates, etc. , This product can realize functions such as remote control of opening and closing and on-site operation control of the valve, and is an indispensable driving device for electric valves. The product has the characteristics of comprehensive functions, reliable performance, small size, light weight, and convenient use and maintenance. Welcomed by the majority of users, it is widely used in petroleum, chemical industry, electric power, metallurgy, papermaking, water treatment and other industries. For valves that need to drive quarter-turn such as ball valves and butterfly valves, you can choose the series of electric worm gear boxes produced by our company. If you need more detailed information about worm gear boxes, please contact our company.
Multi-turn electric actuators are divided into: standard type and explosison-proof type.
Structural design of outdoor standard type and explosion-proof type
Working environment and main technical parameters
Power supply: AC380V (±5%), single phase: AC220V (±5%);
4. 2. Frequency: 50Hz(+0.4%);
4. 3. Relative humidity of the environment: W95% (at 25°C);
4. 4. Altitude: W 1000m;
4. 5. Ambient temperature: -20°C~+60°C;
4. 6. Protection level: IP65;
4. 7. Explosion-proof mark: Ex dIIBT4;
4. 8. The motor is a short-time working system: the rated running time is 10 minutes, and the F class insulation;
Specific models and specifications of AK3 series electric actuators
Structure and working principle
AK3 series actuators are composed of motor, gearbox, stroke control mechanism, torque control mechanism, opening indicator, precision potentiometer, manual/electric switching mechanism, handwheel and electrical parts. The outdoor type adopts round seam and O-ring seal; the explosion-proof type has the same sealing structure as the outdoor type, and an explosion-proof surface structure is added.
Motor: The standard type adopts YDF, the explosion-proof type adopts YBDF series, and the outdoor anti-corrosion and explosion-proof electric valve special motor. Reducer: It consists of a pair of spur gears and worm gears. The power of the motor is transmitted to the output shaft through the reducer. Torque Control Mechanism: It is a common part of the whole series. The structure is shown in Figure 11. When the output shaft is subjected to a certain torque, the worm produces axial displacement in addition to rotation, which drives the bell crank and causes the impact block to produce angular displacement, thereby pressing the cam and lifting the bracket. When the torque on the output shaft increases, the micro switch that outputs the control torque works to achieve the purpose of protecting the electric valve. .The working principle of the motor: the rotation of the motor directly drives the worm gear to rotate through the motor gear, the worm drives the worm gear to rotate, and then drives the output shaft to rotate through the clutch. Electric operation is always given priority. Manual and electric operation drive a pair of bevel gears to rotate while the output shaft rotates, and measure the valve position change through a precision potentiometer.
Stroke controller: It adopts the principle of decimal counter and has high control precision. Common parts for the whole series. The working principle is: a pair of large and small bevel gears in the reduction box drive the active pinion (z=8), and then drive the counter to work. If the counter has been adjusted according to the opening and closing position of the valve, when the counter rotates to the pre-adjusted position (number of turns) with the output shaft, the cam will rotate 90. , to force the action of the micro switch, cut off the power supply of the motor, and stop the motor, so as to realize the control of the stroke (number of revolutions) of the electric device.
Opening indicator: It is a common part of the whole series. Its structure is shown in Figure 13. The input gear is driven by the unit gear of the counter. After deceleration, the indicator disc rotates simultaneously with the valve switching process to indicate the opening or closing of the valve. The moving piece of the potentiometer and the indicator plate rotate synchronously for remote opening indication, and the number of turns can be changed by moving the number of turns adjustment gear. There is a micro switch and a cam inside the opening indicator, when the electric device is running, the cam rotates to make the micro switch act periodically.
Some Cooperative Customers
Electric actuator inspection item list
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