COUNTERCURRENT-TYPE JET MILL Russian patent published in 2002 - IPC

FIELD: fine and superfine milling equipment. SUBSTANCE: mill has basic material hoppers, axial injection nozzles embedded in hoppers and adapted for supplying basic energy carrier. Injection nozzles are connected to main air duct and fixed inside speed-up pipes axially located in countercurrent milling chamber. Thrust branch pipes are arranged in axially aligned relation with speed up pipes. Nozzles embedded in thrust pipes are adapted for supplying additional energy carrier. Gap between outer surface of speed up pipes and inner surface of thrust branch pipes defines channel. Nozzles of thrust branch pipes are connected with additional air duct. Thrust branch pipes at milling chamber inlet end are equipped with squeezing heads, each serving as cutting off plate. Milling chamber is made in the form of truncated cone with annular member on smaller base for rigid attachment on thrust branch pipe. Outer surface of annular member on smaller base thrusts along perimeter upon inner surface of milling chamber. EFFECT: increased efficiency and improved quality of finely ground material. 1 dwg