Patent ID: 7278596

Claim:
A gap adjustment device ( 60 ) for an impact crusher ( 30 ) comprising: a rotor ( 32 ) having a stroke plate ( 322 ); impact plates ( 33 ) arranged with said stroke plates ( 322 ) having gaps (C 1 , C 2 , and C 3 ) there between; a casing ( 31 ) having a movable casing component ( 80 ) and a stationary component with said rotor ( 32 ) connected to the stationary component and said impact plates ( 33 ) fitted to said movable casing component ( 80 ); a forward-backward component ( 65 ) supported by said movable casing component ( 80 ) with said forward-backward component ( 65 ) including a casing side member ( 66 ) and an impact plate side member ( 67 ) threadably fastened to said a casing side member ( 66 ); and a drive component ( 63 ) connected to said movable component ( 80 ) and being rotationally coupled to said forward-backward component ( 65 ) for rotating said casing side member ( 66 ) so as to permit said forward-backward component ( 65 ) to move in a push up direction in response to a substantial impact of said impact plate ( 33 ) with said stroke plate ( 322 ) or said rotor ( 32 ); wherein said gaps (C 1 , C 2 , and C 3 ) between said stroke plate ( 322 ) and impact plates ( 33 ) can be adjusted in accordance with the number of revolutions made by said casing side member ( 66 ).