Ball mill is the most important equipment for various industrial and mining enterprises. In the cement industry, the new dry process cement production line has developed greatly. Although most companies have introduced more efficient vertical mill milling technology, it is also limited to raw In the field of powder milling, in the production of coal powder and cement, the ball mill is still taking on a long time now and soon. At present, the ball mill technology is also constantly developing. From miniaturization to large-scale, from edge transmission to center transmission, in the stage of cement production, high-efficiency double-slip ball mills are widely used, and with the continuous advancement and breakthrough of technology, It is also constantly larger.
The ball mill technology is developing, the working conditions of the equipment are more demanding, and the lubrication of the ball mill support part is important. Although the ball mill has edge drive and center drive, the lubrication structure of the support part is not the same, but the principle of "bearing" or the principle of "bearing bush" cannot be separated. At present, the lubrication technology has also developed with the ball mill technology, from passive lubrication to forced lubrication, but the lubricating oil as a lubricating product has not kept up with the development of the ball mill. So far, there is no special lubricating oil matched with it in China, and the ball mill lubrication still stays at the same time. The use of "gear oil" lubrication of the å°´å°¬ å°´å°¬ , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,
A: Several factors and solutions for the heating of the ball mill bushing due to lubrication, and the temperature setting of the temperature measuring system.
Ball mill equipment processing and installation accuracy is not in place; bearing load is too heavy; abrasive temperature is too high; bearing lubrication and cooling system is not smooth; temperature alarm device failure; insufficient lubricant bearing capacity can cause bearing bush heating, severely cause bearing bush The surface alloy is melted and glued to cause a burnt tile accident, and the heat generated by the lubrication is mainly analyzed.
The oil supply system is not well lubricated with oil, and the heat caused by the cooler is not good.
If the pressure of the thin oil station is low, or the pipeline is blocked, the oil supply will be insufficient, which will cause the lubrication of the oil to cause the bearing bush to heat up. At the same time, the pressure of the thin oil station is low, or the pipeline is blocked, and the oil cooling is not good, which will result in insufficient oil supply. The deviation of the outlet oil temperature is small, which will cause the bearing bush to be removed due to the heat transferred by the abrasive and the environment and the frictional heat of the self. The accumulation of heat causes the temperature of the bearing bush to rise. Such heat can be achieved by adjusting the oil supply pressure, cleaning the oil supply line, and improving the cooling system to achieve a cooling effect. Of course, it is also necessary to control the temperature of the abrasive. Starting from the grinding of the clinker, first reduce the temperature of the clinker, control the feed amount, and appropriately increase the wind speed inside the mill. For the large double-slip mill, the water spray system can also be set in the mill. The insulating material is laid under the grinding tail lining, and the sliding hood is provided with ventilation and air intake device to increase the heat dissipation capability.
1. The heat generated by the deterioration of the ball mill lubricant deterioration.
Some enterprises do not maintain the ball mill equipment in place, causing some dust to enter the lubricating oil to produce a negative effect, which deteriorates the lubricating oil, increases the friction of the bearing bush, and even reduces or blocks the bearing bush gap, causing lubrication failure. Water causes emulsification and deterioration of lubricating oil. Some lubricating oils have a long service life and high temperature, which causes oxidation to fail. These factors are largely artificial, through the lubrication responsibility system, the observation of equipment and lubricants, and the inspection of the lubricating oil to ensure that the lubricating oil does not deteriorate. 2. The heat generated by the deterioration of the ball mill lubricant deterioration.
Some enterprises do not maintain the ball mill equipment in place, causing some dust to enter the lubricating oil to produce a negative effect, which deteriorates the lubricating oil, increases the friction of the bearing bush, and even reduces or blocks the bearing bush gap, causing lubrication failure. Water causes emulsification and deterioration of lubricating oil. Some lubricating oils have a long service life and high temperature, which causes oxidation to fail. These factors are largely artificial. Through the lubrication responsibility system, the ball mill equipment and lubricating oil are observed and tested frequently to ensure that the lubricating oil does not deteriorate. The heat generated by improper selection of the ball mill lubricating oil can be solved.
In the absence of special oil in the ball mill, enterprise oil selection is a problem. As a ball mill design and manufacturing enterprise, most of them provide gear oil to the users. In the process of ball mill operation, the cement companies choose oils in disorder, and the same billiard mill and different ball mills can not be operated according to the ball mill equipment operating load and operating temperature. For environmental conditions, use lubricants with different viscosity grades, viscosity index grades, and medium and heavy extreme pressure grades. For example, a cement enterprise in Henan cement mill is always a type 320# medium load gear oil. It is not divided in winter and summer. Once the equipment has bearing bush heat and oil change, even the cylinder oil that was eliminated early is used. The greater the viscosity of the oil, the better. Viscosity and viscosity index are important indicators of lubricating oil, but the most important is the extreme pressure and anti-wear ability of lubricating oil, that is, the maximum non-biting load PB value obtained by lubricating oil through four-ball testing machine; the maximum non-sintering load PD value; comprehensive wear ZMZ value. From the perspective of scientific development, a lubricating oil has a small viscosity, a high viscosity index, and is resistant to extreme pressure and abrasion. It is a high-quality lubricating oil. Generally speaking, the viscosity is small, which is favorable for heat conduction and high viscosity index. The temperature effect is good, the extreme pressure resistance and the anti-wear ability are high, and the load capacity is high. Therefore, the oil selection should be a lubricating oil with a small relative viscosity, a good viscosity index and a high load carrying capacity. Nowadays, due to the lack of laboratory testing equipment, enterprises cannot fully accurately select oil and oil, and the bearing bush heat is inevitable.
4. The temperature setting of the ball mill temperature measurement system and the bearing capacity of the lubricating oil do not match the heating burnt tile.
According to incomplete statistics, the current setting of the ball mill temperature of the cement industry in the cement industry is mostly between 60 ° C and 70 ° C. These data are generally guaranteed operating temperatures that are not required to be exceeded by the ball mill manufacturer. The setting of this data has certain rationality, at least to ensure that the ball mill bearing bush does not burn at high temperature, but this data is communicated, practiced and scientifically analyzed by the on-site and first-line equipment supervisors, and the data setting itself is not completely scientific. We believe that the temperature setting should not only consider the temperature resistance of the material of the bearing alloy itself, but also fully consider the bearing capacity of the lubricating oil, so that the temperature setting of the temperature measuring system matches the bearing capacity of the lubricating oil. The reason why the bearing temperature exceeds the set temperature is that the bearing bush is easily burnt. When the temperature exceeds the set temperature, the oil film formed by the general gear oil is destroyed, the frictional force is increased, and the "dry grinding" occurs between the metals, resulting in a little surface. Local high temperature burns, burning of bearing pads.
If there is no problem with the temperature setting of a billiard mill, but if he chooses the lubricating oil with lower bearing capacity, in the operation of the ball mill equipment, once the relatively complicated and sudden industrial and mining conditions are encountered, the bearing bush is subjected to a large impact load, and the lubrication is It will suddenly fail, the local temperature will rise sharply, strain and burn the bearing bush; on the contrary, if the lubricating oil with high load is selected, even if it encounters sudden working conditions, the impact load will increase, because the oil film strength cannot be Destruction, lubrication is still in place, the temperature rise is small or not, and even the set temperature of the ball mill bush can be increased. This has also been proved by practice. If a lubricating oil with extreme pressure resistance, abrasion resistance, emulsification resistance and high oxidation resistance is selected, the set temperature of the ball mill bearing bush can be completely improved. Relatively low, conservative, and incompletely scientific set temperatures can seriously affect the normal production of cement companies due to frequent trips.
It is worth noting that some people think that the greater the viscosity of the lubricating oil, the greater its load carrying capacity. The use of a high viscosity lubricating oil can increase the temperature setting of the temperature measuring system. This is inaccurate one-sided, or it is only an apparent phenomenon. To a certain extent, it corresponds to the inherent bearing capacity of the lubricating oil. From a scientific point of view, most of the existing high-quality and high-load-bearing lubricants are enhanced by the addition of new high-efficiency multi-component additives, rather than increasing the viscosity. People should get out of this misunderstanding. The author has tested a ball mill lubricant on a four-ball test machine with a kinematic viscosity of 960 cps at 40 ° C. The maximum no-bite load PB value is only 740 N. The PB value is tested by adding various anti-wear agents and oily agents. Up to 950N. Sometimes the lubricant with a relatively low viscosity has a higher load carrying capacity than a lubricant with a higher viscosity. Therefore, the temperature setting of the temperature measurement system should be more scientifically matched with the bearing capacity of the lubricating oil. The lubricating oil bearing capacity is high, and the temperature setting of the temperature measuring system can be correspondingly higher, but not unlimited. Beijing Qianglian Cement and Zhejiang Changshan Cement alarm temperature settings have reached 90 °C, and some are higher. The following reference data is obtained through a combination of laboratory tests and production practices.
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