Quick opening device for discharging and discharging method

The invention provides a quick opening device for discharging and a discharging method. The device comprises a pneumatic lifting mechanism, a pneumatic rotating mechanism, a gas distribution box, a control box and a flange cover connecting rod. The pneumatic lifting mechanism is integrally fixed to a frame at the bottom of the filtering equipment, the output end of the pneumatic lifting mechanism is of a liftable structure, one end of a flange cover connecting rod is connected to the output end through a bearing, the fixed end of the pneumatic rotating mechanism is fixedly connected with the output end, and the contraction end of the pneumatic rotating mechanism is hinged to the side face of the flange cover connecting rod. The air distribution box supplies air to the pneumatic lifting mechanism and the pneumatic rotating mechanism under the control of the control box, the pneumatic lifting mechanism drives the pneumatic rotating mechanism, the flange cover connecting rod and the flange cover to ascend and de