The maintenance of this part is divided into the inspection and repair of the moving blades and the static blades. When the moving blades are overhauled, they need to be vibrated with a hand hammer one by one. See if there is any movement of the blade. If so, it needs to be fastened, marked, and welded and strengthened.    Remove the five moving blades in each layer of the squirrel cage of the fine grinder to leave enough space to observe the connection and wear of the stationary blades. Rotate the squirrel cage to check whether the connection of the stationary blades is welded or worn. The grinding parts need to be welded firmly with J506/Ф3.2 welding rod. Adjust the angle of the stationary blades, the vertical distance is 110 mm, and the horizontal angle is 17° to ensure the quality of powder selection. The article mainly introduces the problem of how to repair the sorter and the louver ring of the vertical roller mill. The maintenance is an operation performed before the fault has occurred. The purpose is to detect the existence of the fault in time and is important to reduce the occurrence of the fault. In addition to these two parts, maintenance is also very important for other parts in raw tea.