Unlocking and limiting device

The invention discloses an unlocking and limiting device, and relates to the technical field of AGV braking. According to main points of a technical scheme in the invention, the unlocking and limiting device comprises a limiting mechanism assembly, an unlocking mechanism assembly connected with the limiting mechanism assembly in a matched mode and a power push rod, wherein the limiting mechanism assembly comprises a limiting stop block seat, a stop block lifting insertion hole is formed in the limiting stop block seat, a limiting stop block head used for allowing the upper end to penetrate out for limiting is arranged in the stop block lifting insertion hole, and a lifting unit for driving lifting is arranged at the bottom of the limiting stop block head; and the unlocking mechanism assembly comprises an auxiliary bottom plate, the auxiliary bottom plate is provided with a spring pin seat and a driving unit, and the driving unit is used for driving the lifting unit to operate. The purposes of directly driving