Electric unlocking undercarriage down lock tension spring actuator cylinder and movement method

The invention provides an electric unlocking undercarriage downlock tension spring actuator cylinder and a movement method, the actuator cylinder integrates a downlock tension locking function and an electric drive unlocking function, and comprises a static end support lug, a static cylinder, a motor, a speed reducer, a lead screw, a lead screw nut, a lead screw nut limiting bolt, a tension spring, a sliding cylinder and a sliding end support lug; the design scheme that a linear electromechanical actuator is combined with an undercarriage downlock tension spring actuator cylinder is adopted, in the load bearing process of an undercarriage, a tension spring outputs tension to undercarriage lock rods through an actuator supporting lug, the tension locking function is shown outwards, and the two lock rods of the undercarriage are kept to be in contact without loosening; in the unlocking process of the down lock in the ground state, the actuating cylinder has a thrust unlocking function outwards, the length of th