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The rolling sound of bearings can be used to judge faults.

The size and quality of the rolling sound of the bearing in operation are checked by a microphone. Even if the bearing is slightly peeled off, it will emit abnormal and irregular sounds, which can be distinguished by a microphone. It is a very common way to identify irregular movement by hearing. For example, the use of electronic stethoscope to detect the abnormal noise of a part is often used by experienced operators.
1, if the bearing is in good continuous state, it will make a low purring sound. If a sharp hissing, squeaking and other irregular sounds are made, it is often indicated that the bearing is in poor condition of connection. The sharp squeak noise may be due to improper lubrication. Improper bearing clearance also causes metal noise.
2. The dent in the concave rail on the outer ring of the bearing will cause vibration and cause smooth and crisp sound.
3. If the striking marks caused by the installation will also produce noise, the noise will vary with the speed of the bearing.
4, if there is intermittent noise, it means that the rolling parts may be damaged. This sound occurs when the damaged surface is rolled over, if there are contaminants in the bearing often cause hissing. Serious damage to the same bearing will cause irregular and loud noise.
5. Bearing damage can be detected by hearing, but usually the bearing must be replaced immediately. Therefore, better methods such as SKF electronic condition monitoring are used. The new invention ensures a safer and more accurate prediction of the bearing condition than the old method of using a stick or screw against the bearing box and the other end against the ear.