Demounting tool special for fan bearing

A special disassembling tool for a fan bearing comprises a jackscrew, a movable disc and four sets of drawing assemblies. One end of the jackscrew is provided with an external thread; a threaded through hole matched with the jackscrew is formed in the center of the movable disc; the four sets of drawing assemblies are annularly distributed on the outer circumference of the movable disc and correspond to four bolt holes in a bearing sleeve to be disassembled one to one. Each drawing assembly comprises a pull rod, an upper pull arm and a lower pull arm set, each lower pull arm set is composed of a plurality of lower pull arms, a corresponding fastening bolt is installed in an inner threaded hole of each lower pull arm, and each fastening bolt is in threaded connection with a bolt hole in the corresponding to-be-detached bearing sleeve. The upper end of the pull rod is hinged to an upper pull arm fixed to the movable disc, and the lower end of the pull rod is hinged to one lower pull arm of the lower pull arm se