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

By -
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.

https://www.uoeco.org

Comments

Post a Comment

Popular posts from this blog

Selection of spodumene flotation reagents

By -
Image
At present, the  beneficiation methods of spodumene  mainly include: manual separation, thermal disintegration, magnetic separation, resuspension method,  flotation method  and combined beneficiation method. Among them, the flotation method of spodumene is the most studied in the laboratory and the most widely used mineral processing method in industry. 1. Cationic collectors The cationic collectors used in the flotation of spodumene ore are mainly amine collectors, which flotate gangue minerals such as quartz, feldspar and mica under acidic conditions, and leave the spodumene at the bottom of the tank. This method is often used in the roughing of spodumene, and cannot directly obtain spodumene concentrate with higher purity, and needs to be used in conjunction with other sorting methods. In production practice, Yan Gengsheng used  the process of flotation of spodumene  with mixed soap and diesel oil under alkaline conditions after flotation of mica with phylloylamine under acidic cond
Read more

How to use inclined plate thickener for tailings dry discharge

By -
Image
 Tailings treatment is an important part of mine production. Concentration in dry tailings discharge is an important link in achieving dry stacking. It not only directly affects the processing capacity of filter equipment, but also affects the resistance of filter cakes. The particle is resistive to the filter cake, so according to the characteristics of iron tailings, there is a new type of thickener . The flow of tailings slurry in the thickener is ideally slow. As soon as the solid particles leave the flow layer, they will be considered as sediment. This model is also called shallow sedimentation. The sedimentation occurs in the void between the inclined plates. Within the cavity, but due to the small spacing between the inclined plates, it creates favorable conditions for the formation of laminar flow. The clarified overflow water moves upward along the inclined plate space, and the solid particles settle between the two plates, and only need to settle to a small distance to fall o
Read more

A new type of coarse particle flotation machine for rough grinding and flotation in mines

By -
 Coarse ore flotation has always been one of the key technologies for mine coarse grinding and flotation to reduce energy consumption. An iron ore plant in Anhui Province has a very small content of mica in the iron ore of the first grinding product. Recovery value. However, there are generally two ways to recover mica at present: one is coarse-grained regrind and reselection; the other is to choose equipment suitable for coarse-grained mineral flotation. However, during the inspection of the production site, it was found that many of the mica minerals in the second-stage grinding products in this iron ore did not meet the particle size requirements of flotation, and the density of mica was small, and most of them showed flaky structure. The overflow of the cyclone ran out, causing the inspection and screening operation to be blocked first, so regrinding is not suitable for the recovery of coarse mica.     The design principle of coarse-grained flotation machine is that coarse-grained
Read more