Slow roller oil spills and damage of bearing failure analysis, seven points for attention of mill maintenance

Slow roller oil spills and damage of bearing failure analysis, seven points for attention of mill maintenance - 2019 03 - 18 slow roller bearing is a key and vulnerable parts, grinding in roller bearing lubrication with immersion oil lubrication and forced circulation lubrication of two forms, now use slow roller lubrication way more use thin oil lubrication cycles. In this paper, wind pressure sealing roller mill as an example, detailed analysis of roller oil leakage and damage to the bearing fault, puts forward vertical mill maintenance will know seven points for attention. Roller oil spills and bearing damage fault reason 1 seal air pressure roller seal to prevent rollers in high concentration of dust into the cavity, protect the roller bearing damage, the grinding chamber via the sealing machine drum into a high wind, in the grinding chamber to form positive pressure, so as to achieve the aim of prevent dust entering. But grinding condition is very complex, within the state of suspension of the dust concentration is very high, in the process of production may develop any of the following: (1) seal fan wind down or seal fan filter and filter cloth dust jam, sealed into the grinding chamber of air volume and air pressure to reduce; (2) wind pressure sealing pipe flange and grinding in poor sealing pipeline joint bearing each join in sealing and air leakage, led into the grinding chamber air pressure to reduce; (3) in the mill feed mill run or stop the condition in vain not ignored in the grinding chamber to produce the negative state. All these reasons are likely to lead to into the grinding chamber air volume and air pressure is reduced, easy to make the micro particle material into the roller seal wind cavity, damage roller ring and oil seal, cause roller oil or bearing damage. 2 roller oil level too high or too low vacuum determines the grinding roller of roller return pipe cavity oil level, the adjustment of vacuum pressure is directly related to the roller bearing lubrication state, oil level too high or too low will cause roller oil or bearing damage. Due to the importance of roller contrary mill bearing lubrication system, in the normal production can be simple and easy method is rapid diagnosis of roller bearing fault: whether there is a field observation in the roller oily status, or through the detection of metal particles content in sample, to determine whether a roller bearing damage, if the metal particles content in the sample is more, show the bearing has been badly damaged. 2 it is to observe roller oil temperature. If a grinding roll back to the oil temperature, other roller return oil temperature is normal, that the roller bearing damage. Roller bearing maintenance seven points for attention of roller bearing replacement workload is very big, in the case of spare parts ready, replace the roller or a set of roller bearing the fastest also need to 7 days or so, and replacement cost is high, the economic loss is bigger. Therefore, in order to guarantee the normal operation of the roller bearing, in daily maintenance needs to do the following: 1. Ensure the normal operation of the seal fan, wind pressure shall be not less than specified value, under normal circumstances should keep above 20 bar, seal duct should be inspected regularly to see if there is any breakage; Rollers cavity seal duct and joint bearing flange joints is release, etc. At the same time, in order to guarantee into the roller is compressed air cleaning, be sure to add filter at the entrance of the fan and filter cloth, in order to prevent the micro particle material into the roller seal wind cavity, damage roller ring and oil seal, cause the roller oil spill. 2. Roller return hose vacuum degree determines the oil level of the grinding chamber, in order to keep the roller in the oil level is relatively stable, vacuum pressure adjustment must be careful, it is directly related to the roller bearing lubrication state. Oil pressure is too high, of oil in the oil level rises, the grinding roller is too high, easy to cause roller oil spills, and even damage the oil seal; Oil pressure is too low, oil is low or lack roller, roller bearing lubrication easy damage. A range of in - generally vacuum degree adjustment 0. 10 ~ - 0. Between 35 bar. 3. To check the running status for roller lubrication system, such as the oil temperature is normal, should be in normal production medium oil temperature 5253 ℃, roller and connection between the fuel tank balance pipes with and without blocking, vacuum switch is normal, the tubing connector and hose have damaged gas leakage, return pipe work is normal, etc. To closely observe change of the fuel tank oil level at the same time, when abnormal fluctuations to fuel tank oil level, must carefully analyze reasons, find the question crux, timely treatment, in order to prevent bearing damage due to the lack of oil or gas too much cause the roller seal be broken up. 4. Add grease regularly for roller on both sides of the sealing ring. Generally add cycle for a month. In hot rollers and the hydraulic jacking to join, join while artificial plate moving roller, do not add too much, so as to avoid grease packed seal. 5. On a regular basis to test the oil, to detect the contents of metal particles in the sample, to determine the bearing damage. Keep the oil clean at the same time, according to the situation of oil and oil filter replacement intervals to determine whether to replace lubricating oil. 6. Attaches great importance to the mill of warming and cooling operations. Most companies don't pay attention to the litre cooling operation of vertical mill, don't realize the reasonable level of cooling operation can prolong the service life of key large bearing and wear parts. Reasonable can make the temperature uniform heat roller cover, liner, bearing, extending plate, the service life of roller shell and key bearing, the price of these key components in the mill spare parts is more expensive, damage any part will directly affect the operation cycle of grinding machine. 7. Conducted in grinding welding construction, must pay attention to the connection and grounding of weldments and welding current can not bearing or ground points, otherwise it will damage the bearing or ground point.