Mechanical REDUCER converts the high-speed and small-torque output power of the servo motor into the low-speed and high-torque output power of the actuator output shaft to drive the movement of control mechanisms such as valves. The two-phase servo motor rotates the ball nut through the worm gear, so the screw produces axial displacement to drive the output shaft to move up and down in the guide groove. The bracket is equipped with a limit block to achieve mechanical limit at both ends of the stroke. The reducer directly drives the valve after amplifying the output torque of the motor. Because the motor speed used by the electric actuator is very high, and the full stroke time of the actuator output shaft needs 25%, that is, the output shaft speed is 0.6r/min, so the main output of the motor There must be a reducer between the shafts, and the reduction ratio is generally 1000-1500.
The reducer in the electric actuator adopts a transmission mechanism that combines a set of spur gears and planetary gears. It is mainly composed of eccentric wheel, balance wheel, gear, internal gear, pin shaft, pin sleeve, cam and output shaft. The working process of Mechanical REDUCER is: the spur gear (cylindrical gear) 2 on the output shaft of the motor drives the gear 3 integrated with the eccentric shaft to rotate. The eccentric end of the eccentric shaft is covered with a gear 4 (ie balance wheel), and the eccentric shaft is also It is the guide rod in the planetary gear transmission mechanism. The internal gear 10 is fixed and the eccentric shaft rotates to drive the balance wheel 4 to swing along the internal gear 10 and move by itself. Then the coupling 7 transmits the rotation of the gear 4 to the output shaft. Executive agency. Obviously, the swing of the balance wheel is not needed by us, so we choose a pin shaft, pin sleeve and coupling to connect the balance wheel with the output shaft to eliminate the influence of the balance wheel swing on the output shaft.