Treatment experience of bolt fracture of large gear ring of 3.2mx13m mill

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Frequent bolt breakage is a phenomenon that often occurs during the working process of the mill. The reason for bolt breakage is that the manufacturing size of the large ring gear does not match the original design, and the rigidity of the ring gear is insufficient, which will cause the running track to appear elliptical and the large ring gear The excuse bolt is subjected to a lot of shearing force and breaks.
In order to strengthen the fastening capacity of the bolts, we will adopt larger grades and higher strength bolts to ensure its strength. When checking the broken bolts, it was found that the nuts of the broken bolts had a small or trace amount of polishing. It can be judged that the bolts were loosened first and then broken. If you can ensure that the bolts are not loose, or reduce the impact of the bolts, the problem may be solved.
To prevent loosening, you can try positive and negative buckle bolts and nylon composite nuts. You can do the following:
(1) Change the bolt structure. The original M60x300 single-head bolts and M60x380 stud bolts can all be selected from M60x380 positive and negative buckle double-headed studs with positive and negative buckle nylon composite nuts on the inside, and 40Cr for the outer back nut is better.
(2) Strengthen maintenance. After running for a week or a month, fix the bolts 2 to 3 times to prevent them from loosening. The tightening force should ensure that the inner nylon composite nut does not crack.

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