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What should I do if the vertical grinding roller leaks oil?

Date:2019-07-15 15:14     writer:cement editor     Views:

The problem of oil leakage in grinding rolls often occurs in cement plants with vertical mills, which is a problem that has always plagued vertical mill manufacturers. Oil spills not only pollute the environment, but also increase production costs. ......

1, the problem

The problem of oil leakage in grinding rolls often occurs in cement plants with vertical mills, which is a problem that has always plagued vertical mill manufacturers. Oil spills not only pollute the environment, but also increase production costs. There are many reasons for the leakage of the vertical grinding roller. There are two main points in the summary:

First, the reason for the grinding roller seal. At present, the vertical grinding roller seal mainly adopts three skeleton lip seals, one dustproof and two oilproof. However, the working environment of the vertical grinding 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.

The following reasons are caused by poor lubrication of the grinding roller lubrication system:

(1) Temperature reasons. When the grinding is started or the ambient temperature is too low, the temperature inside the grinding roller and the temperature of the oil return pipe are not high. Since the vertical grinding generally uses a lubricating oil with a viscosity of about 320 mm 2 /s, the fluidity is poor, so that the oil return is not smooth.

(2) Reasons for resistance. The lubrication of vertical mills generally adopts the method of centralized lubrication. The other oil stations including the lubrication station of the grinding roller are concentrated in one room. The lubrication point of the vertical mill is generally far away, so the resistance of the pipeline is large, resulting in oil return. Not smooth.

(3) Reasons for pipeline intake. Because the actual oil supply and oil return are impossible to achieve, in order to ensure that the oil level is not too high, the oil return is greater than the oil supply. The return oil is located at the minimum oil level that needs to be guaranteed. When the oil level is lower than the minimum oil level, the return pump will be emptied, resulting in a decrease in the capacity of the return pump and poor oil return.

2, the solution

For this reason, in the case that the grinding roller seal and the grinding roller lubrication system are difficult to effectively improve, Jidong equipment starts from controlling the oil level in the grinding roller, and adds a high temperature resistant liquid level sensor in the grinding roller, as shown in Fig. 1. A good result was achieved.

The liquid level sensor lead mounted on the grinding 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 with the grinding roller oil supply line, often The 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 grinding 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.

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