Linear actuator with contact type safety nut, and aerial work platform

A linear actuator with a contact safety nut, comprising a central screw, a driving nut mechanism, and a safety nut mechanism coupled to the driving nut mechanism, wherein the central screw has a screw raceway, the safety nut mechanism comprises a safety nut seat sleeved at the periphery of the central screw, limit hole channels pointing to the central screw are arranged on the safety nut seat along a circumferential direction of the safety nut seat, an elastic buffer element is arranged in each of the limit hole channels, a safety ball is arranged between the elastic buffer element and the central screw, the safety ball partially extends into the screw raceway to be partially positioned in the corresponding limit hole channel, and the safety ball is capable of rolling along the screw raceway and moving along the corresponding limit hole channel;

• thread teeth are provided on an inner wall of the safety nut seat, and the thread teeth extend into the screw raceway and are spaced from the central screw.