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The ball mill is the key equipment that used to crush material, It is widely used in cement, silicate products, new building materials, refractory materials, fertilizer, black and non-ferrous metal processing and glass ceramics production industry, it is suitable for grinding various ores and other materials, which are widely used in mineral processing, building materials and chemical industries, and can be divided into dry and wet these two grinding ways. Small ball mill is widely used in thermal power plant pulverizing system, but its drive shaft vibration and small cone broken tooth have been plagued the production safety system, in the previous period of my factory, milling system is much troubled by these two defects, and even affect the fuel supply unit, after adjusting several times by the maintenance personnel, the effect is significant, the drive shaft vibration is lower than 0.08 mm. In recent times, the failure of the ball mill cone broken teeth is rarely heard, and now, we summary these failures as following: Specific measures: 1, the top clearance of the gear transmission assembly is one important parameter, as the procedures specified, the gap of the small cone is 7.5-8.5 mm, but in the current production, the equipment has been operated long-term, the large gear ring impact under stress is deformed, the original circular gradient gradually becomes elliptical, so its tip local clearance is even less than 6 mm, in the current process, the tip clearance should be adjusted to 8.5 – 10 mmin order to reduce the impact caused by the tip clearance, resulting in overload broken tooth. 2, the clamping force of the large ring gear enough is one of the important reasons caused the deformation. In current operation, in addition to increase the clamping force of the bolts, use the 10 mm thick steel plate to connect the ring joints together, increase the fastening plane, prevent ring deformation, guarantee the master, the driven wheel angular velocity, prevent the transmission ratio change the inertial force, resulting in fatigue fracture. 3 Fully lubricated drive shaft bearing is one important reason to ensure its smooth operation, the current traditional regular refueling manually move is used also ensure the bearings to get enough lubrication, but this could easily lead to excessive or inadequate amount of lubricant, we recommended that adopt the mechanical timing, quantitative scientific to add grease, thus ensuring moderate bearing lubrication, reducing vibration to avoid bearing wear, cage rupture and prolong life..