High temperature often indicates that NTN bearings have been in abnormal conditions. High temperature and harmful to the lubricating oil in the bearing. Sometimes, bearing overheating can be attributed to the lubricant of the bearing, and the long-term operation of the bearing at the temperature of more than 125 ℃ reduces the service life of the bearing. Causes Affecting the Service Life of Koyo Bearings and Maintenance Measures
The causes of high-temperature bearing include insufficient or excessive lubricating oil, impurities in the lubricating oil, heavy load, bearing damage, lack of space, high-temperature friction with the oil seal, etc.
Therefore, continuous monitoring of bearing temperature is necessary, whether it is measuring the bearing itself or other important parts. If there is no change in operating conditions, any temperature change may fail.Details of NTN bearing maintenance
Bearing temperature measurement can often help the thermometer to accurately measure the temperature of the bearing and measure the temperature according to the temperature.
The important NTN bearing is that when it is damaged, it will cause equipment shutdown time, so this kind of bearing should be equipped with temperature detector. Under normal circumstances, the bearing’s lubrication and natural temperature rise after lubrication and last for one or two days.Details of NTN bearing maintenance
If you have a good lubrication with the debris and moisture of the right barrier of the bearing, it is said that the seal should not be worn. However, it is in the open bearing housing to visually inspect and regularly inspect the bearing oil seal. The bearing oil seal conditions are checked everywhere to ensure that they are not enough to prevent liquid or corrosive liquid or gas from entering the bearing along the axis. The protective ring and labyrinth seal shall be coated with grease to protect them. Details of NTN bearing maintenance
If the oil seal is worn, replace it as soon as possible. In addition to preventing the magazine from entering the NTN bearing, another function of the oil sealing function is to keep the bearing housing lubricated. If the oil seal leaks, immediately check that the seal has been worn or oil blocked loose.
The phenomenon of leakage may also be caused by the looseness of the bearing housing joint or the formation of mixing and leakage detection due to the addition of too much lubricating oil. The automatic lubrication system ensures the correct amount of lubricant and reviews whether it is colored or black. If there is such a phenomenon, it is usually said that the lubricant contains magazines.Details of NTN bearing maintenance
It is a common method to use hearing to recognize irregular operation. For example, with the help of an electronic stethoscope, part of the abnormal noise is heard by experienced operation methods.
If the bearing is in good working conditions, it will make a low hum sound. If a sharp hiss, squeaks and other irregular sounds, it is usually called the poor working conditions of the bearing. The harsh creak may be caused by improper lubrication. Improper NTN bearing clearance may also cause metal sound. Details of NTN bearing maintenance
Dents on the bearing outer ring track will produce vibration and cause a smooth and crisp sound. If the scar due to the installation of percussion music will produce noise, the noise will vary with the bearing speed.
If there is intermittent noise, the rolling element will be damaged. This sound occurs on the surface of rolling bearings on the date if contaminants often cause a hissing sound. Severely damaged bearings will produce irregularities and noise.Details of NTN bearing maintenance
Bearing damage is a matter of awareness, but usually it is time to replace the bearing. Therefore, a better method, such as using electronic monitoring equipment, is to diagnose the running state of bearings.
1: The flow bearing is lubricated with grease. After 1500 hours of operation, the grease should be replaced in time. It should be noted that the amount of oil added should be appropriate, because too little or too much grease will lead to bearing heating. Chuangyu recommends that the amount of oil added should be maintained at 1 / 2 ~ 2 / 3 of the volume of the bearing chamber.Details of NTN bearing maintenance
2: Motor bearings (mostly of this type) using sodium base grease are characterized by high temperature resistance (125 ℃), but the disadvantage is that they are easy to dissolve in water, so the lubrication of water pump bearings is completely inappropriate.Details of NTN bearing maintenance
3: The container used to hold lubricating oil or grease shall be clean and sealed at ordinary times. Do not let dust, scrap iron and other sundries fall into it to avoid damaging the bearing.Details of NTN bearing maintenance
4: One thing that needs special attention is that the lubricating grease (oil) of the newly put into use water pump must be replaced in time after 100 hours of operation, and then once after 500 hours of operation.Details of NTN bearing maintenance
5: For NTN bearings lubricated with lubricating oil, the oil volume shall be added to the specified position.Details of NTN bearing maintenance