Multifunctional bottom bearing centering device

The utility model provides a multifunctional bottom bearing centering device which comprises a central shaft and a rack, the rack is provided with the central shaft through a rotating shaft sleeve assembly, the rotating shaft sleeve assembly comprises a bearing sleeve, an upper bearing and a lower bearing, the inner walls of the upper end and the lower end of the bearing sleeve are provided with bearing grooves used for assembling the upper bearing and the lower bearing, and the upper bearing and the lower bearing are arranged in the bearing grooves. The upper bearing and the lower bearing are embedded into the bearing grooves respectively, the upper end of the center shaft is vertically inserted into the bearing sleeve, and the center shaft is rotationally connected with the bearing sleeve through the upper bearing and the lower bearing; according to the utility model, the rotating shaft sleeve assembly is arranged between the rack and the central shaft, so that the mounting precision of the bearing can be e