Gradual-change double-meshing rotating body type concrete gel foam generating device

The invention discloses a gradually-changing double-meshing rotating body type concrete gel foam generating device which comprises an air pipe, a motor, a gear module, a rotating shaft, an adding device, a reaction chamber, a spiral blade, an observation hole and the like, and aims to inject concrete gel foam into a spontaneous combustion zone of a goaf and block an air leakage area. The inner wall curve of the adding device is designed into a cycloid, and the material falling speed is high; a three-stage jet device is arranged at a liquid inlet, and three raw materials for preparing foam are quantitatively sucked into the reaction chamber in sequence by utilizing negative pressure generated by high-speed water flow; a rotary vibration screen is mounted outside the gravel port to screen out medium-particle-size gravels; the reaction chamber is internally provided with the double-helix blades with gradually-changed sizes, so that stirring is more sufficient; the motor drives the hollow rotor shaft to rotate th