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Bearing sound, temperature and vibration
date：2019-12-22 11:12 Read：次
1. Rolling sound of bearing
Use the sound detector to check the rolling sound size and sound quality of the bearing in operation. Even if the bearing has slight peeling and other damage, it will also emit abnormal sound and irregular sound, which can be distinguished by the sound detector. It is a common method to identify irregular operation by hearing. For example, using electronic stethoscope to detect abnormal noise of a part is a method used by experienced operators. If the bearing is in good continuous running condition, it will make a low whine. If there is a sharp hiss, squeak and other irregular sound, it often indicates that the bearing is in a bad continuous running condition. A sharp squeak may be caused by improper lubrication. Improper bearing clearance can also cause metal noise. The dent in the concave track of the bearing outer ring track will cause vibration and make a smooth and crisp sound. If the knock caused by installation will also produce noise, the noise will vary with the speed of the bearing. If there is intermittent noise, the rolling element may be damaged. When the damaged surface is rolled, if there is contamination in the bearing, it will often cause hissing. Serious bearing damage can produce irregular and loud noise.
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. The new invention ensures a safer and more accurate estimation of the bearing condition than the old method, which uses a wooden stick or screwdriver on the bearing box and the other end sticks to the ear.
2. Temperature of bearing
Generally, the temperature of the bearing can be measured by the temperature outside the bearing. If the temperature of the outer ring of the bearing can be measured directly by using the oil hole, it is more appropriate.
Generally, the temperature of the bearing rises slowly with the running of the bearing, and reaches a stable state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation are not appropriate, the temperature of the bearing will rise abruptly, and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures shall be taken. The working temperature of the bearing can be monitored at any time by using the thermal sensor, and the automatic alarm or stop can be realized when the temperature exceeds the specified value to prevent the shaft burning accident.
High temperature often indicates that the bearing is in abnormal condition. The high temperature is harmful to the lubricant of the bearing. Sometimes, the overheating of the bearing can also be attributed to the lubricant of the bearing. If the temperature of the bearing exceeds 125 ℃ for a long time, the service life of the bearing will be reduced. The causes of bearing high temperature include insufficient or excessive lubrication, impurities contained in lubricant, excessive load, bearing ring damage, insufficient clearance and high friction caused by oil seal, etc.
Therefore, it is necessary to monitor the bearing temperature continuously, no matter the bearing itself or other important parts. If the operating conditions are unchanged, any temperature change can indicate that a fault has occurred. Regular measurement of bearing temperature can be achieved by means of thermometer, for example, SKF digital thermometer can accurately measure bearing temperature and display it in units of ℃ or Fahrenheit. For bearings of high importance, when they are damaged, the equipment will be shut down, so it is better to install temperature detectors for such bearings. Under normal circumstances, there will be a natural temperature rise of the bearing just after lubrication or re lubrication and it will last for one to two days.
3. Bearing vibration
Bearing vibration is very sensitive to bearing damage, such as peeling, indentation, rust, crack, wear, etc. will be reflected in bearing vibration measurement. Therefore, the vibration can be measured by using a special bearing vibration measuring device (frequency analyzer, etc.), and the specific abnormal situation can not be inferred by frequency. The measured values are different due to the service conditions of the bearing or the installation position of the sensor, so it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
Use the sound detector to check the rolling sound size and sound quality of the bearing in operation. Even if the bearing has slight peeling and other damage, it will also emit abnormal sound and irregular sound, which can be distinguished by the sound detector. It is a common method to identify irregular operation by hearing. For example, using electronic stethoscope to detect abnormal noise of a part is a method used by experienced operators. If the bearing is in good continuous running condition, it will make a low whine. If there is a sharp hiss, squeak and other irregular sound, it often indicates that the bearing is in a bad continuous running condition. A sharp squeak may be caused by improper lubrication. Improper bearing clearance can also cause metal noise. The dent in the concave track of the bearing outer ring track will cause vibration and make a smooth and crisp sound. If the knock caused by installation will also produce noise, the noise will vary with the speed of the bearing. If there is intermittent noise, the rolling element may be damaged. When the damaged surface is rolled, if there is contamination in the bearing, it will often cause hissing. Serious bearing damage can produce irregular and loud noise.
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. The new invention ensures a safer and more accurate estimation of the bearing condition than the old method, which uses a wooden stick or screwdriver on the bearing box and the other end sticks to the ear.
2. Temperature of bearing
Generally, the temperature of the bearing can be measured by the temperature outside the bearing. If the temperature of the outer ring of the bearing can be measured directly by using the oil hole, it is more appropriate.
Generally, the temperature of the bearing rises slowly with the running of the bearing, and reaches a stable state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation are not appropriate, the temperature of the bearing will rise abruptly, and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures shall be taken. The working temperature of the bearing can be monitored at any time by using the thermal sensor, and the automatic alarm or stop can be realized when the temperature exceeds the specified value to prevent the shaft burning accident.
High temperature often indicates that the bearing is in abnormal condition. The high temperature is harmful to the lubricant of the bearing. Sometimes, the overheating of the bearing can also be attributed to the lubricant of the bearing. If the temperature of the bearing exceeds 125 ℃ for a long time, the service life of the bearing will be reduced. The causes of bearing high temperature include insufficient or excessive lubrication, impurities contained in lubricant, excessive load, bearing ring damage, insufficient clearance and high friction caused by oil seal, etc.
Therefore, it is necessary to monitor the bearing temperature continuously, no matter the bearing itself or other important parts. If the operating conditions are unchanged, any temperature change can indicate that a fault has occurred. Regular measurement of bearing temperature can be achieved by means of thermometer, for example, SKF digital thermometer can accurately measure bearing temperature and display it in units of ℃ or Fahrenheit. For bearings of high importance, when they are damaged, the equipment will be shut down, so it is better to install temperature detectors for such bearings. Under normal circumstances, there will be a natural temperature rise of the bearing just after lubrication or re lubrication and it will last for one to two days.
3. Bearing vibration
Bearing vibration is very sensitive to bearing damage, such as peeling, indentation, rust, crack, wear, etc. will be reflected in bearing vibration measurement. Therefore, the vibration can be measured by using a special bearing vibration measuring device (frequency analyzer, etc.), and the specific abnormal situation can not be inferred by frequency. The measured values are different due to the service conditions of the bearing or the installation position of the sensor, so it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
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