Electric actuator having hand-screw release device

An electric actuator having a hand-screw release device, the electric actuator comprising:

• a housing, a drive motor, a transmission assembly, a rotary screw rod and a driving nut, the drive motor activating, via the transmission assembly, the rotary screw rod to rotate, rotation of the rotary screw rod bringing the driving nut to move axially along the rotary screw rod, characterized in that the electric actuator further comprises:
• a clutch device provided between the transmission assembly and the rotary screw rod and configured to engage or disengage power transmission between the transmission assembly and the rotary screw rod;
• a self-locking device configured to produce a friction resistance against the rotary screw rod when the rotary screw rod rotates reversely, wherein the self-locking device comprises a release torsion spring for unlocking the self-locking device;
• and
• a hand-screw release device provided on the housing, the hand-screw release device comprising a first driving member, a second driving member, and a release rotary knob for activating the first driving member and the second driving member, the first driving member being connected to the clutch device, the second driving member being configured to connect the self-locking device, and the release rotary knob being turned to present an initial state and a completely released state, wherein in the course of switching from the initial state to the completely released state, the first driving member activates the clutch device to disengage the power connection, and the second driving member activates the release torsion spring to unlock the self-locking device.