铜陵有色金属集团控股有限公司天马山矿4号和5号都是φ3.2 m×3.1 m格子型球磨机,已使用50 a,筒体和端盖等大件磨损极为严重。2008年铜陵有色金属集团控股有限公司批示“此2台分期报废,换用冬瓜山铜矿报停的2台同型号规格的球磨机”。4号球磨机将滑动主轴承改为滚动轴承,现已 Tongling Nonferrous Metals Group Holdings Limited Tianma Mine No. 4 and No. 5 are φ3.2 m × 3.1 m grid-type ball mill, has been used 50 a, cylinder and end caps and other large wear is extremely serious. In 2008, Tongling Nonferrous Metals Group Holdings Co., Ltd. instructed that “the 2 sets of scrapped vehicles will be replaced with 2 sets of the same type of ball mill” reported by Dongguashan Copper Mine. No. 4 ball mill main bearing will be changed to rolling bearings, is now