Lubrication is essential when girth gear are running on site, which determines the service life of the girth gear. Discontinuous spray lubrication can adhere to the tooth surface during grinding mill operation, in the interval of 2 times of refueling, a layer of anti-extrusion and non-destructive wear-resistant oil film should be formed, and no oil accumulation and hardening are required at the root of the tooth. The amount of oil used and the interval between each spray depends mainly on the size of the girth gear and the kind of oil used. The best time for oil injection is when the girth gear rotates for 2 cycles. The temperature of the pinion tooth surface is a direct reflection of the load it receives, reflecting the installation and adjustment of the pinion shaft group. The difference in the temperature of the pinion along the tooth width indicates that the gear meshing is poor, which often occurs at the beginning of the operation, the reasons are as follows: the deformation of the cylinder which causes the girth gear to be skewed, the loosening of the foundation bolt and the sinking of the foundation. If the temperature difference between the pinions is too large, the pinion must be adjusted again. The temperature distribution of the tooth surface can be visualized by an infrared temperature detecting device installing on the gear cover. In addition, the vibration monitoring of the pinion bearing can also reflect the meshing condition of the girth gear and small one. If the normal setting is exceeded, the gear meshing changes. If this value exceeds the normal given value, the meshing of the gear will change. The regular inspection of fuel injection system and gear meshing condition can prolong the service life of gear.
