Adjusting unit of counterattack wall of crusher, adjusting unit group and crusher

The utility model discloses an adjusting unit of a counterattack wall of a crusher, which comprises a fixed adjusting seat and an adjusting screw fixed on an outer shell of the crusher; the inner end of the adjusting screw is hinged with the counterattack wall of the crusher; the adjusting unit also comprises a transition plate and a floating adjusting seat, which are fixedly connected with the fixed adjusting seat; the inner end of the floating adjusting seat has a floating cooperation with the fixed adjusting seat, and the outer end passes through the transition plate; an adjusting nut sleeves on the floating adjusting seat; the outer end of the adjusting screw passes through the fixed adjusting seat, the floating adjusting seat and the adjusting nut, and has a meshing transmission with the adjusting nut; a spring is arranged between the floating adjusting seat and the transition plate. The adjusting unit of the counterattack wall of the crusher conveniently adjusts the gap distance between a rotor of the c