Damage reason analysis of mineral sizers bearing:
After inspecting the maze seal of the bearing damaged by the crusher, it is found that there are a lot of oil mud and coal powder in the maze passage, and the maze passage has been worn. When finding out the reason why coal powder enters the maze passage, it is found that the static maze seal eaves on the end face of the maze are shorter, and when the dynamic maze seal matches with it, the maze passage goes radial, which leads to the coal powder easily entering the maze passage. In this way, long time running wear will cause the maze path to widen, coal powder more easily enter, resulting in the failure of the maze.
2. Failure analysis of lip seal Due to the failure of labyrinth seal, after a long time of operation, the internal lip seal is affected by coal powder, lip surface wear intensification, rubber aging, resulting in lip seal damage and failure.
3. Bearing damage reason analysis of mineral sizers (1) Bearing cavity internal factors analysis. During the inspection after the disassembly of the equipment, it was found that the bearing roller was seriously worn, and the shape of the square appeared. Due to the foreign matter such as pulverized coal entering the raceway along the gap, the bearing roller was not lubricated enough, and the rolling body was blocked. With the increase of foreign matter, the rolling body was stuck, and the bearing inner and outer rings and the rolling body were friction and wear. (2) The impact of flexible deformation occurs when the crushing roll is running. When the crushing roll is rotating, the crushing roller has a slight flexible deformation due to the influence of the material. Coupled with the vibration of the equipment, the normal operation of the bearing is affected to a certain extent. (3) Impact of crushing roll bearing lubrication system. Crusher bearing centralized lubrication oil output is insufficient or pipeline blocking, resulting in poor bearing lubrication, accelerated bearing wear, resulting in bearing damage.
4. Inspection of the bearing rolling body and the inner and outer rings revealed that the mineral sizers rolling body was seriously worn with a square shape and the raceway of the inner and outer rings was worn. The direct reason for the bearing damage was the failure of the inner skeleton oil seal and the outer metal labyrinth seal. Resulting in poor bearing lubrication, blocked rolling body, coupled with the abnormal vibration of crusher operation, with the increase of foreign matter, lead to intensified wear of rolling body, bearing stuck, bearing inner and outer rings and rolling body friction and wear, bearing high temperature damage.