Steel head blackening preventing device for finish rolling system

The utility model discloses a steel head blackening prevention device for a finish rolling system. The steel head blackening prevention device comprises a plurality of groups of finish rolling machines and a PLC (Programmable Logic Controller) in communication connection with the finish rolling machines, an electric control blind plate valve for controlling on-off of a finish rolling turbid circulating water path is mounted between every two adjacent finish rolling machines; each electric control blind plate valve is connected to a normally open end of a 24-volt relay in the control box; the other normally open end of the relay is electrically connected to a 24V power supply in the control box; the control end of the relay is electrically connected to the controller; and each group of finishing mill load signals are accessed into the controller. According to the device for preventing the steel head from blackening for the finish rolling system, the electric control blind plate valve isadditionally arranged an