Automatic sludge discharging device and method for sludge dewatering system

The invention discloses an automatic sludge discharging device and method for a sludge dewatering system. The discharging device comprises a sludge bin, the sludge bin is installed on a civil engineering structure embedded steel plate through a bin support, an intermittent oscillator and a material sensor are installed on the bin wall of the sludge bin, and a hydraulic gate mechanism is installed at a discharging port of the sludge bin. The material sensor detects the material condition in the sludge stock bin in real time and feeds back the material condition to the PLC control box. The hydraulic flashboard gate mechanism drives a hydraulic oil cylinder-push rod through a hydraulic motor to drive a flashboard of the flashboard gate to open and close, so that unloading or sludge bearing is realized; the hydraulic oil cylinder-push rod is further provided with a hydraulic push rod limiting stopper connected with the PLC control box, and automatic discharging control is achieved. The intermittent oscillator con