Overflow ball mills are divided into grid type cement ball mills and overflow type ball mills according to different ore discharge methods. Wet overflow ball mills are the most commonly used powder mills in mining plants. The conical cement ball mill has been phased out due to its low production efficiency, multiple types of jaw plates, and difficult maintenance, and is still used in some old mining plants.
The structure of overflow type ball mill is composed of barrel section, bearing end cover, main rolling bearing, hollow motor shaft, transmission gear of transmission system and ore feeder. The overflow type ball mill has a relatively slow ore discharge rate, and high relative density ore particles are not easily discharged, which can easily cause over crushing. Barrel section 1 is welded with thick steel plates with a thickness of 15-36mm by electric welding. The flanges produced by casting steel are welded on both sides of the barrel section, and the bearing end covers 2 and 3 are connected to the flanges with anchor bolts. The two must be precision machined and matched with each other. Due to the installation of a hollow motor shaft of powder mill quality, it is welded to the bearing end cover. There are 1-2 manhole openings on the cylinder section for maintenance and replacement of the jaw plate. The overflow type ball mill tube section and bearing end cover are internally laid with a jaw plate 5.
Overflow ball mills are divided into grid type cement ball mills and overflow type ball mills according to different ore discharge methods. Wet overflow ball mills are the most commonly used powder mi