Flotation cell liquid level automatic control device and method

The invention discloses a flotation cell liquid level automatic control device and method. The control device mainly comprises a liquid level control device, an ore pulp liquid level measurement device and a pneumatic control valve. The ore pulp liquid level measurement device detects the liquid level height of the ore pulp and feeds back the liquid level height of the ore pulp to the liquid level control device. The liquid level control device calculates the difference of a liquid level feedback value and a liquid level setting value, and selects a liquid level control mode to adjust the pneumatic control valve size so as to control the ore pulp liquid level height according to the difference value size. The liquid level control device combines the Fuzzy control and the PID control, and employs a Fuzzy-PID composite controller to automatically control the flotation cell liquid level. When the liquid level deviation is large, the Fuzzy control is adopted. The response speed is fast and the dynamic property is