在过去长期的运行中,我厂10台苏联φ287/410型球磨机经常发生头颈螺栓(即螺旋管与空心轴联接螺栓)的断裂、松动,甚至发生螺旋管移位脱出的现象。过去我们曾采用手扳钻扳眼的方法,钻去断截螺栓,调换新的35CrM。合金钢螺栓,但仍未解决上述缺陷。后来我们反复核算287/410型球磨机螺旋管的膨胀值,还自制专用内外卡尺,仔细测量螺旋管与 In the past long-term operation, I plant 10 sets of φ287 / 410-type ball mill often occur head-and-neck bolt (that is, spiral pipe and hollow shaft coupling bolts) fracture, loosening, and even spiral tube displacement prolapse phenomenon. In the past we have used the method of hand-held drill to drill eyes, drill to cut the bolt, replace the new 35CrM. Alloy steel bolts, but still not solve the above defects. Later, we repeatedly 287/410 ball mill spiral expansion value, but also made special internal and external calipers, careful measurement of spiral and