Automatic sludge discharge device for sedimentation tank of waterworks

The utility model discloses an automatic sludge discharge device for a sedimentation tank of a waterworks, which relates to the field of tap water treatment and comprises a raw water inlet pipeline, a flocculation tank communicated with the raw water inlet pipeline, the sedimentation tank communicated with the flocculation tank, a to-be-filtered water outlet pipe communicated with the sedimentation tank and a coagulant storage tank. The dosing metering pump and the PLC control device are communicated with the coagulant storage tank, the liquid outlet end of the dosing metering pump is communicated with the flocculation tank, a coagulant flowmeter is arranged between the dosing metering pump and the raw water inlet pipeline, and a mud concentration meter and an electric mud valve are arranged in the sedimentation tank. The coagulant flowmeter, the mud concentration meter and the electric mud discharge valve are in signal connection with the PLC control device, the PLC control device is provided with a mathemat