1.The rolling sound of Timken spherical roller bearings
They are using a sound detector to check the size and audio quality of the rolling sound of the bearing during operation. Even if the bearing is slightly damaged, such as peeling, abnormal sounds, and irregular sounds will be emitted, which can be distinguished by the sound detector. Using hearing to identify irregular movements is a prevalent method. For example, using an electronic stethoscope to detect abnormal noise from a part is a method used by experienced operators. If the bearing is in proper continuous rotation, it will emit a low whining sound. If it produces sharp hissing, squeaking, and other irregular sounds, it often indicates that the bearing is in a bad continuous rotation condition. The sharp creak may be caused by improper lubrication. Improper bearing clearances can also cause metallic noise. The indentation of the concave track on the bearing outer ring track will cause vibration and create a smooth and crisp sound. If it is due to knocking injuries caused during installation, the noise will also be generated, and this noise will vary with the speed of the bearing. If there is intermittent noise, the rolling elements may be damaged. When the damaged surface is rolled over, contamination in the bearing often causes a hissing sound. Severe bearing damage can produce irregular and loud noises.
Bearing damage can be detected by hearing, but usually, the bearing must be replaced at this time. Therefore, a better method is to use SKF Electronic Condition Monitoring. Compared with the old way of using a wooden stick or screwdriver to bear on the bearing box and the other end against the ear, the new invention can ensure a safer and more accurate estimation of the bearing condition.
2.The temperature of Timken spherical roller bearings
The temperature of the bearing can generally be measured from the heat outside the bearing. It is more suitable if the temperature of the outer ring of the bearing can be directly measured using the oil hole.
Generally, the temperature of the bearing gradually rises as the bearing starts to run, and reaches a steady-state after 1-2 hours. The average temperature of the bearing varies with the machine's heat capacity, heat dissipation, speed, and load. If the lubrication and installation are not suitable, the bearing temperature will rise sharply, and abnormally high temperatures will occur. At this time, the operation must be stopped, and the necessary precautions must be taken. The use of a thermal sensor can monitor the working temperature of the bearing at any time, and realize automatic alarm or stop when the temperature exceeds the specified value to prevent a shaft accident.
High temperatures often indicate that the bearing is in an abnormal condition. High temperatures are harmful to bearing lubricants, and sometimes bearing overheating can also be attributed to bearing lubricants. Long-term continuous rotation of the bearing at a temperature exceeding 125 ° C will reduce the bearing life. Causes of taking high temperatures include insufficient lubrication or excessive lubrication, impurities contained in the lubricant, unreasonable load, bearing damage rings, insufficient clearance and high friction caused by oil seals, etc.
Therefore, it is necessary to monitor the bearing temperature continuously, whether it measures the bearing itself or other essential parts. If the operating conditions are not changed, any temperature change can indicate that a failure has occurred. The periodic measurement of bearing temperature can be performed with the help of a thermometer. For example, if a digital thermometer can accurately measure the bearing temperature and display it in ° C or Fahrenheit. Highly suitable bearings will cause equipment shutdown when they are damaged. Therefore, it is best to install a temperature detector for these bearings. Under normal circumstances, the bearing will have a natural temperature rise immediately after lubrication or re-lubrication and last for one to two days.
3.The vibration of Timken spherical roller bearings
Bearing vibration is very sensitive to taking damage, such as peeling, indentation, rust, crack, wear, etc. will be reflected in the bearing vibration measurement, so the vibration can be measured by using a particular bearing vibration measuring device (frequency analyzer, etc.) The size of the abnormal situation can not be inferred from the frequency. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.