Large space two-stage telescopic controllable mechanism type robot maintenance mechanism

Provided is a large space two-stage telescopic controllable mechanism type robot maintenance mechanism. A lifting part of the mechanism is a controllable plane five-rod mechanism, and the plane five-rod mechanism is high in flexibility and large in working space and can achieve accurate positioning and facilitate accurate positioning of a robot. A telescopic part of the mechanism is composed of two groups of crank sliding block mechanisms to finish a two-stage telescopic function, kinematic pairs of the crank sliding block mechanisms are lower pairs and are low in pressure intensity, the abrasion is small, the kinematic pairs are convenient to lubricate, and rods can be long and can be used for long-distance steering control. According to the mechanism, the lifting is performed through the five-rod mechanism, the accurate positioning is achieved, a two-stage telescopic function is achieved through the two groups of crank sliding block mechanisms, and the large space two-stage telescopic controllable mechanism type robot maintenance mechanism is large in working space and convenient to control.