Synchronous swing type four-roll crusher

The invention discloses a synchronous swing type four-roll crusher which comprises a rack, two upper swing rolls and two lower swing rolls, wherein two ends of the two upper swing rolls are respectively arranged on two sides of the rack by virtue of upper swing bearing blocks; two ends of the two lower swing rolls are respectively arranged on two sides of the rack by virtue of lower swing bearingblocks; the upper swing bearing blocks and the lower swing bearing blocks are all hinged with the rack; an upper cylinder and a lower cylinder are respectively arranged in the middle parts of the leftand right sides of the rack; both the bottom of the upper cylinder and the bottom of the lower cylinder are hinged with the rack; a sliding seat I and a sliding seat II are arranged at the upper endsof the upper cylinder and the lower cylinder; the sliding seat I and the sliding seat II are respectively arranged in a chute which is vertically formed in the rack; the sliding seat I and a slidingseat II are respectively hin