Automatic spraying device for nodular cast iron pipe and control method

The invention discloses an automatic spraying device for a nodular cast iron pipe and a control method, and belongs to the technical field of spraying cooling. The device comprises a controller, a temperature acquisition module, a nodular cast iron pipe, a conveyor arranged below the nodular cast iron pipe, a spraying pipeline arranged above the nodular cast iron pipe, a tracking positioning valve arranged on the spraying pipeline, a nozzle arranged on the spraying pipeline, and a temperature acquisition module arranged near the nodular cast iron pipe, wherein the tracking and positioning valve is arranged at the upstream of the nozzle, and the controller is connected with the temperature acquisition module and the electrical end of the tracking and positioning valve; and the controller is used for receiving the data acquired by the temperature acquisition module, calculating a temperature difference value between the target temperature and the surface temperature of the nodular cast iron pipe, calculating co