Vertical roller mill roller oil leakage is a very serious problem, especially in this era of rising oil prices. The vertical roller mill roller oil leakage is not only a waste of resources, but also seriously affects the normal operation of the slag vertical roller mill. Therefore, this paper mainly makes a simple analysis and solution for the phenomenon of vertical roller mill oil leakage!
1. Analysis of the cause of oil leakage in vertical roller mill roller
There are two main points in the cause of vertical roller mill roller oil leakage:
First, the reason for the grinding roller seal. At present, the vertical roller mill roller seal mainly adopts three skeleton lip seals, one dustproof and two oilproof. However, the working environment of the vertical roller mill is very harsh, and it belongs to the working condition of high dust, high temperature and shock vibration, so the seal wears quickly. And the sealing and replacement is very difficult. It is necessary to turn the roller and remove the grinding roller from the rocker arm. The work is time-consuming, laborious, and the maintenance cost is high.
Second, the grinding roller lubrication system does not return oil. When the roller is working, the bearing will generate some heat and it is in a high temperature environment. Therefore, it is generally lubricated by thin oil circulation, so that excess heat can be taken away to ensure that the bearing is in the normal temperature range. However, if the oil return is not smooth in the actual work, the oil level in the grinding roller will rise and finally overflow from the oil seal and the air.
2, to solve the vertical roller mill roller oil leakage method
For this reason, in the case that it is difficult to effectively improve the grinding roller seal and the grinding roller lubrication system, the vertical mill manufacturer starts from controlling the oil level in the grinding roller, and adds a high temperature resistant liquid level sensor in the grinding roller, which can be achieved. A very good result.
The liquid level sensor lead mounted on the vertical roller mill roller bearing gland is taken out from the grinding roller shaft, and a three-way electromagnetic ball valve is added to the oil station oil supply line, and the normally open point is connected to the grinding roller oil supply line. The normally closed point is connected to the return line.
When the liquid level in the mill is measured to be higher than the upper limit, the electromagnetic ball valve will transfer the oil supplied from the oil supply pump to the return line, and when the liquid level lower limit is reached, the electromagnetic ball valve will be switched to the oil supply line, thereby realizing Control of the lubricating oil level in the grinding roller.
Since the vertical roller mill roller rotates and rises up and down during operation, the liquid level changes up and down. When the value is taken, we only collect the minimum value in the liquid level sensor for 5s as the actual liquid level value, so that the actual situation of the liquid level can be reflected.
By adding the liquid level sensor, it can be ensured that the grinding roller does not leak oil when the grinding roller seal wears and the oil return is not smooth; the liquid level change in the grinding roller can also be monitored in real time, so that the oil level can be known and controlled, The control of grinding has taken another step towards intelligence.