The fracture causes of joining bolt joined between feeder and quill shaft of ball mill are biggish gap between feeder and quill shaft, defective seal cone washed by ore pulp.
球磨机进料器与中空轴联接螺栓断裂原因是进料器与中空轴之间间隙过大，密封锥面受矿浆冲蚀而被破坏。
2
The fracture causes of joining bolt joined between feeder and quill shaft of ball mill are biggish gap between feeder and quill shaft, defective seal cone washed by ore pulp. etc.
球磨机进料器与中空轴联接螺栓断裂原因是进料器与中空轴之间间隙过大，密封锥面受矿浆冲蚀而被破坏。
3
This paper analyzes the reasons leading to rolled stock jamming in duo cone type piercing mill on piercing mill adjustment and tool shape etc. and puts forward corresponding preventive measures.