The factors that influence the vertical grinding mill performance
The vertical grinding mill system is a complete system with grinding and drying function, featuring simple operation, high efficiency, and low power consumption. However, the roller bearings of the vertical grinding mill system are quite expensive. The normal operation of the rollers seriously affects the smooth operation of the whole vertical grinding mill system. Once problems occur, not only the cost is higher, but also longer maintenance time. For the enterprise, time is money, which seriously affects the profit of the enterprise.
Attention must be paid to the wear of the slag vertical grinding mill roller. For the staff, they must be well trained. At the same time, the observation of the working parameters of the vertical grinding mill must be strengthened to prevent problems with the roller bearing, which can ensure the stable operation of the entire system. .
2 Reasons why wearing problems of slag vertical grinding mill rollers happen
2.1 Poor bearing quality: when grinding, the poor quality bearing can bring larger vibration, and the feeding rate is low, which can easily lead to bearing damage. In order to lower the breakdown rate of the entire vertical grinding system because of bearing damage, higher quality bearing must be used.
2.2 Not enough lubricant for grinding rollers: compare the quantity of lubricant several times when bearing is damaged, and then observe that lubricant quantity, which is also related to temperature. Insufficient lubricant will cause serious wearing between the grinding roller and the bearing, and then generate a lot of heat, and it cannot be released in time. Poor lubrication effect will affect the operation of the machine and reduce its service life.
2.3 Poor quality lubricant. For the selection of lubricant, it is necessary to choose a good type and high cost performance to achieve certain benefits. Poor quality lubricant will have a lower lubricating effect, which makes it impossible to form a good oil film between the bearing and bearing support. So the temperature increases, its color will become black, and the viscosity will decrease, which will seriously reduce the service life of the bearing, cause waste of materials, bring grinding work interruption, seriously affect the progress of the entire project and reduce the company’s profit.
2.4 The uneven distribution of the materials into the vertical grinding mill: with the daily analysis of the thickness of the materials into the grinding mill, it can be found that when there are many layers of materials, the load of the grinding roller will increase, and the corresponding wear will be more serious, which will cause the accumulation of material; after the material enters the grinding mill, it is easy to deviate from the center of the disc, causing long-term high-load operation of the roller bearing, resulting in bearing damage.
3. Solutions to the problems of slag vertical grinding mill roller wearing
3.1 The assembly of grinding rollers should not be too tight, and do not loosen the bearings before mounting. Be sure to check them to see if they are of high quality and good quality. The use of good quality bearings is conducive to the smooth development of slag vertical grinding technology and also to the follow-up. The work is carried out to reduce intermediate losses, and it should not be too tight and too loose during installation. If it is too tight, it will lead to accelerated wear, and it will reduce the gap between the raceways, which will cause the temperature to rise, which will cause the bearing to be used shortly. , Directly scrapping, greatly reducing the service life of the bearing; at the same time, when the bearing is damaged, too tight will also cause it to be difficult to remove from the grinding roller, bringing further difficulties to the vertical grinding work. If it is too loose, the gap between the grinding wheels will increase, and the grinding roller and the bearing cannot be closely connected. When the grinding roller rotates, the phenomenon of seizure often occurs. The two bite each other. The bearing cannot be removed from the grinding roller again, which may damage the grinding roller. Therefore, at the same time as inspecting the quality of the bearing before installing it, the installation operator should also pay attention to the fact that the installation rollers should not be too tight and not too loose.
3.2 When using the correct assembly method, the size of the bearing should be tested first. After the test, you must check whether it is correct and ensure that it is correct before preparing for the next operation. Then you must perform certain protective treatment. It is guaranteed not to enter into dust, water and other pollutants. And during the assembly process, pay attention to the time and temperature at all times, and the time and temperature required for different grinding rollers are different. The oxide scale generated by heating must be cleaned up. At this time, the staff must wear the operation special gloves to prevent accidents such as burns. After the assembly is completed, the inspection should be continued to prevent the gap between the inner bearing and the outer diameter from increasing, which will seriously affect the grinding roller.
3.3 The amount of lubricant should be sufficient, the category should be good, and the lubricant must be good and cost-effective to achieve certain benefits. It is best to use industrial oil with high viscosity and good stability. At the same time, reduce the bearing temperature and adjust to a suitable temperature. And increase the oil pressure and ensure bearing lubrication. At the same time, it is necessary to increase the amount of oil, reduce the running-in between the grinding roller and the bearing, prevent damage to the bearing, affect the operation of the machine, and reduce its service life.
3.4 Ensure the tightness of the grinding roller The tightness of the grinding roller will also have a great impact on the bearing. Be sure to use a special rotating oil for sealing, which can not only lubricate, but also prevent dust, water stains and wind and dust from entering into it, and play a good sealing role. If the sealing effect is poor, the gas will enter the sealing area from it, and then enter the bearing area, causing unnecessary damage to the bearing, reducing the lubrication effect, and even causing the surface of the raceway to fall off.
3.5 Regular cleaning and cleaning device For the roller device, it is necessary not only to adopt a good configuration, but also to do a good job of maintenance to reduce its problems. The grinding mill device has been used for a long time, and there must be a lot of dust and dirt on the corresponding parts of the grinding roller, and there may even be some iron filings. The company must send staff to clean up regularly. For example, the rollers of the grinding mill need to be cleaned to ensure that there are no iron filings in the interior, and the staff must check carefully to ensure that there are no residues, otherwise it will cause serious damage to the grinding mill. After the cleaning of all parts, you can scrub with diesel to ensure the quality of the parts. For the oil holes, be sure to use compressed air for cleaning to ensure that the previously used oil is completely blown out, and then inject new dry oil, and repeat the operation; when cleaning parts, pay attention to the order of cleaning and be orderly Don’t miss it, and keep the daily parts clean and tidy