Trench type transmission shaft dismounting and mounting device for large road maintenance machinery

The utility model relates to the technical field of maintenance machinery, in particular to a trench type transmission shaft dismounting and mounting device for large road maintenance machinery, which comprises a fixed frame and a hydraulic lifting platform for lifting a transmission shaft, the hydraulic lifting platform is fixed on the inner wall of the fixed frame, and a fixed base is mounted on the outer wall of the top of the hydraulic lifting platform; the hydraulic lifting platform, the rotating mechanism and the universal wheels are arranged on the fixed base, the rotating mechanism is arranged above the fixed base, and the rotating mechanism comprises a supporting ring rotationally arranged on the outer wall of the top of the fixed base. And three degrees of freedom of vertical displacement, transverse displacement and circular motion can be matched to avoid obstacles in a maintenance space, the transmission shaft is moved out, the working efficiency is improved, and the working hours for disassemblin