Drum-type ball mill

The invention discloses a drum-type ball mill, which relates to the technical field of ball mills, and has the technical key points that a discharging and ball changing mechanism comprises ventage cylinders fixed at two ends of a ball mill frame, feeding cylinders are fixed on the ventage cylinders, and a tooth groove cylinder in transmission connection with a driving timing mechanism is sleeved between the feeding cylinders in a limiting manner; a first transmission gear in transmission connection with the driving timing mechanism sleeves the upper limit of the ventage cylinder in a limiting manner, a bump rod is fixed on the first transmission gear, one end of the bump rod penetrates through the ventage cylinder and is in sliding connection with an inner track groove rod, a first partition plate is fixed on the inner track groove rod, and second partition plates are fixed at two ends of the inner track groove rod; steel balls located in the ventage cylinder, the feeding cylinder and the tooth groove cylinde