Language
29
2019
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10
Failure Analysis of Ball Mill Liner
Author:
First, the main function of the ball mill liner is to protect the mill barrel and drive the grinding ball inside the grinding to do the sloping movement to smash the material in the crushing mill. To this end, the mill liner is required to have sufficient lifting and disturbing ability for the grinding ball. Studies have shown that it is difficult to achieve effective lifting of the grinding ball during the operation of the mill. At this time, the intensity of the steel ball in the mill decreases, which in turn causes the mill to reduce the material crushing efficiency. At the same time, because the height difference between the peak and the valley of the lining is not up to standard, the relative movement of the grinding ball and the cylinder lining is severe. The existence of this problem leads to the occurrence of the furrow wear phenomenon of the mill lining. The rapid wear of the mill liner is aggravated, and the liner is scrapped in advance because the bottom of the furrow will be worn first.
Second, in the design process of the barrel of the grinding machine, the designer simply thinks that the wear of the mill liner is evenly worn, so the vacant groove on the back of the lining is designed as a circular vacancy. This is not the case.
During the operation of the mill, the reaction force on the peak side of the lining in the process of lifting the grinding ball is particularly strong, so the part will be subjected to strong cutting wear, so the wear is most serious. The design of the arc-shaped vacant groove on the back of the lining plate makes the thickness of the lining plate substantially uniform, and the rapid wear of the top position on the crest side will cause the lining to be worn first, causing the lining to be scrapped in advance.
Third, the traditional mill liners mostly use high manganese steel, using its unique work hardening characteristics to achieve its wear resistance. Under the grinding condition, high-manganese steel can not be fully hardened. Generally, high-strength and tough wear-resistant cast steel is used. The hardness is generally between HRC45-60. The hardness of the lining plate is moderately lower, so the wear resistance is general. If the hardness of the liner body can be improved, the wear resistance of the liner is improved and the service life is greatly improved.
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