The replacement work of the vertical grinding roller bearing is very large. When the spare parts are fully prepared, it takes about 7 days to replace the vertical grinding roller or a set of vertical roller mill roller bearings, and the replacement cost is high, resulting in economic loss. Big. Therefore, in order to ensure the normal operation of the vertical grinding roller bearing, the following points need to be done in daily maintenance:
1. Ensure the normal operation of the sealed fan, the wind pressure should not be lower than the specified value. Under normal conditions, keep the temperature above 20Bar. Regularly check whether the sealed air duct is damaged; the connection between the sealed air duct and the vertical grinding roller in the grinding chamber Whether the joint bearing flange is disengaged, etc. At the same time, in order to ensure the positive pressure air cleaning into the vertical grinding roller, it is necessary to install a filter screen and filter cloth at the inlet of the fan to prevent the micro-particle material from entering the vertical grinding roller sealing air chamber and damaging the vertical grinding roller sealing ring. And the oil seal causes the vertical grinding roller to leak oil.
2. The vacuum degree of the vertical grinding roller return pipe determines the oil level in the vertical grinding roller cavity. In order to keep the oil level in the vertical grinding roller relatively stable, the adjustment of the vacuum pressure must be cautious, which is directly related to the vertical grinding. The lubrication state of the roller bearing. The oil pressure is too high, the oil level in the vertical grinding roller rises, the oil quantity is too high, it is easy to build the grinding roller to leak oil, and even damage the oil seal; the oil pressure is too low, the oil in the vertical grinding roller is low or lacking, lubrication Insufficient damage to vertical grinding roller bearings. Generally, the adjustment range of vacuum is between -0.10 and -0.35 bar.
3. Regularly check the running condition of the vertical grinding roller lubrication system. If the oil temperature is normal, the oil temperature in normal production should be 52-53 °C. Is there any blockage between the vertical grinding roller and the fuel tank? Normal, the tubing joints and hoses are damaged or leaked, and the return pipe is working properly. At the same time, it is necessary to closely observe the oil level change of the fuel tank. When it is found that the oil level of the fuel tank is not fluctuating normally, it is necessary to carefully analyze the cause, find the problem and solve the problem, and deal with it in time to prevent the bearing from being damaged due to lack of oil or excessive oiling. The seal was broken.
4. Regularly add grease to the seals on both sides of the vertical grinding roller. The general addition period is one month. When the vertical grinding roller is hot and is hydraulically jacked up, the vertical grinding roller is added while the artificial disc is added, and the excessive grinding roller is not added, so as to prevent the grease from squeezing and sealing.
5. Regularly test the oil quality and test the content of metal particles in the oil sample to judge the damage of the bearing. At the same time, keep the lubricating oil clean, and judge whether to change the lubricating oil according to the oil quality and the replacement interval of the oil filter.
6. Pay attention to the heating and cooling operation of the mill. Most manufacturers do not pay attention to the lifting and lowering operation of the vertical mill. They do not realize that reasonable lifting and lowering operation can prolong the service life of key large bearings and wear parts. Reasonable heating rate can make the sleeve, liner and bearing evenly heated, thus prolonging the service life of the liner, the sleeve and the key bearing. These key components are more expensive in the spare parts of the mill, and any one of them is damaged. Will directly affect the mill's operating cycle.
7. When welding is carried out in the grinding, attention must be paid to the wiring and grounding of the welded parts. The welding current cannot pass through the bearing or the twisted point, otherwise the bearing or the twisted point will be damaged.