A good way to teach you is to judge the fault of NTN bearing by listening to the sound. This should be done in a quiet environment first, and then listen carefully to the sound of forklift bearing.
Among them, the bearing is the focus of attention, because it is an important rotating part of all machines. Bearing condition monitoring is an important part of preventive maintenance. For example, it is used by experienced operators to detect the abnormal noise of a part with the help of electronic stethoscope.
Correct Handling Method of Judging NTN Forklift Bearing Abnormality Through Noise
1. Oil bath lubrication
Oil bath lubrication is an ordinary bearing lubrication method, which is suitable for the lubrication of low and medium speed bearings. Part of the NTN bearing is immersed in the groove, and the lubricating oil is taken up by the rotating forklift bearing parts, and then flows back to the oil groove. The oil level should be slightly lower than the center of the low rolling element.Correct Handling Method of Judging NTN Forklift Bearing Abnormality Through Noise
2. Drip lubrication
Oil dripping lubrication is suitable for bearing components requiring quantitative supply of lubricating oil. The amount of oil dripping is generally one drop every 3-8 seconds. Excessive amount of oil will increase the bearing temperature.Correct Handling Method of Judging NTN Forklift Bearing Abnormality Through Noise
3. Circulating oil lubrication
The filtered oil is transmitted to NTN bearing parts by oil pump, and the lubricating oil after passing through the bearing is filtered and cooled before use. Since the circulating oil can take away a certain amount of heat and cool the bearing, this method is applicable to the bearing parts of forklift with high speed.Correct Handling Method of Judging NTN Forklift Bearing Abnormality Through Noise
4. Spray lubrication
The dry compressed air is mixed with the lubricating oil through the sprayer to form an oil mist. In the jet bearing, the airflow can effectively cool the bearing and prevent impurities from invading. This method is suitable for the lubrication of high-speed and high-temperature bearing parts.Correct Handling Method of Judging NTN Forklift Bearing Abnormality Through Noise
5. Jet lubrication
Use the oil pump to inject the high-pressure oil into the inlet bearing through the nozzle, and the oil injected into the bearing flows into the oil groove through the other end of the forklift bearing. When the NTN bearing rotates at a high speed, the rolling element and cage also form air flow around at a fairly high rotation speed.
It is difficult to send the lubricating oil to the bearing by general lubrication method. At this time, the lubricating oil must be sprayed into the bearing by high-pressure injection method, and the position of the nozzle should be placed between the inner ring and the center of the cage.Correct Handling Method of Judging NTN Forklift Bearing Abnormality Through Noise
After many auditions, it will be found that if the forklift bearing is in good operation condition, it will make a low whine. If it makes a sharp hiss, bearing, squeak and other irregular sounds, it usually indicates that the bearing is in poor operation condition. If the knocking scar caused by installation will also produce noise, the noise will vary with the speed of NTN bearing.
If there is intermittent noise, it means that the rolling parts may be damaged. The sound of forklift bearing occurs when the damaged surface is rolled out. This is the way to judge the bearing fault by sound. As long as the fault is found, it will be easy to repair.