Intermediate crushing type impact crusher for medium-hard rock and working method

The invention relates to the technical field of crushers, in particular to an intermediate crushing type impact crusher for medium hard rock and a working method. The crusher comprises a rotor, an impact plate part, a flattening plate part and a shell; the impact plate part adopts a hydraulic adjusting protection device, so that the operation time and difficulty of maintenance and adjustment are greatly reduced; a rack structure adopted by the flattening plate part greatly increases the flattening effect of materials, so that the grain shape of the materials tends to be round, and due to the same hydraulic flattening plate part adjustment and protection integrated structure, the operation time and difficulty of maintenance and adjustment are reduced, and the capability of discharging iron and other difficult-to-crush foreign matters is enhanced; the transportation and installation adaptability of the crusher is optimized through the new subdivision face structure of the shell and the detachable connection mod