Gas and liquid knife and control method thereof

A gas and liquid knife, comprising:

• a chamber and a knife head provided at the chamber;
• an ejection opening is provided at the knife head, which communicates with an internal of the chamber;
• wherein the knife head has a first knife lip and a second knife lip, the ejection opening is defined between a first inner wall of the first knife lip and a second inner wall of the second knife lip;
• wherein the chamber has a first wall plate and a second wall plate slidably connected with each other, and provided with an inlet;
• the first knife lip connects to the first wall plate, and the second knife lip connects to the second wall plate, the first knife lip and second knife lip moves relatively as the first wall plate and the second wall plate slides relatively, such that a minimum distance between the first inner wall and the second inner wall could be changed;
• a measure assembly having a dial and a scale mark portion for illustrating a relative movement distance between the first knife lip and second knife lip;
• the dial is fixedly connected to the adjusting screw, and the scale mark portion is provided on the holder.