The ball mill head is the collective name for the end cover of the cylinder and the trunnion. It sustains the rotation load of the entire mill body and grinding media, and continuously operates under the action of alternating stress. It is also the weakest link of the ball mill and the most difficult to control the manufacturing quality. Ball mill head has the following structure types:

Type one: It is a one-piece mold that the end cover and the trunnion are cast. This kind of structure is simple and convenient to install. It is suitable for small and medium-sized mills. For large-diameter ball mills, casting defects are easy to generate, because the ball mil end cover occupies a large flat area and is relatively thin. Even if more feeding risers are used for casting, the cooling shrinkage is also non-uniform, thus the transitional surfaces of the trunnion and the end cover create greater stress and loose tissue. This kind of defect is sometimes found when the cutting process goes to a certain extent, which will cause undue rework waste, and sometimes this kind of defect is in a concealed state and cannot be discovered in time, that will cause even greater damage because the part is subjected to alternating stress during the operation of the mill, and there is a greater concentration of stress and fracture occurs after a period of operation.

Type two: The end cover and the trunnion are divided into two parts and then combined together. The end cover and the trunnion are respectively cast and assembled together with bolts after processing, end cover uses steel plate welded structure. This structure avoids the above-mentioned casting defects. Although this can solve some problems, but consumes more raw materials and processing workload, and increase the workload of the installation. The advantages of this structure are that the manufacturing process is simple, the cutting process and cutting surface are less, the raw material consumption is less, the end cover quality can be guaranteed, and casting defects do not exist. The end covers are welded to the cylinder body, and the connection is reliable and labor-saving, avoiding the need for bolt or rivet connection.

CHAENG, as a professional manufacturer for mill spare parts, can manufacture ball mill head (or ball mill trunnion and ball mill end cover separately) according to customers’ drawings and requirements, using high-quality steel materials and mature technology to guarantee the quality.

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E-mail: casting@chaeng.co

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