Three-shaft screen changer

The utility model relates to the technical field of screen exchangers, in particular to a three-shaft screen exchanger which comprises a lining layer and a pressure-bearing assembly, and the pressure-bearing assembly comprises a pressure-bearing stand column and a pair of auxiliary auxiliary rollers, the pressure-bearing stand column is rotatably connected to a lower inserting column in an inserted mode, and the auxiliary auxiliary rollers are distributed in a bilateral symmetry mode. The filter screen is supported through the pressure-bearing stand column and prevented from deforming, meanwhile, the two ends of the filter screen are limited in position through the pair of auxiliary auxiliary rollers which are symmetrically distributed, in the filter screen replacing process, through auxiliary rotation of the pressure-bearing stand column, the transverse driving force of the filter screen is improved, it is guaranteed that the filter screen moves smoothly, and the filter screen replacing efficiency is improve