It is increasingly important to check the condition of the running transfer and to have a thorough inspection plan in advance. Among them, the bearing is the focus of attention, because it is the most important rotating part of all the turning, condition monitoring is an important part of preventive maintenance. Bearing damage was detected early to avoid unplanned equipment downtime due to bearing damage.
Especially in important machines or in harsh environments, bearings should be inspected frequently. There are quite a few systems and instruments on the market to monitor bearings. Most of these instruments are based on vibration measurements.
However, not all instruments are equipped with these advanced instruments. In this case, the operator or maintenance engineer of the transfer must be highly alert to the "fault signal" of the bearing, such as noise, temperature and vibration. “Listening,” “touching,” and “observing” are three important methods. The following comments can be used as a reference.
1. Listening
Using auditory to identify irregular movements is a very common approach. For example, the use of an electronic stethoscope or a mechanical listening needle to detect abnormal noise of a part is often a method used by experienced workers. If the bearing is in good operating condition, it will make a low hum. If it is a sharp hum, arpeggio and other irregular sounds, it usually indicates that the bearing is in poor working condition.
Sharp humming noise can be caused by improper lubrication, and improper bearing clearance can cause metallic sound. The indentations on the outer ring of the bearing cause vibration and result in a smooth and crisp sound. If the knocking flaw caused by the installation also produces noise, the noise will vary with the speed of the bearing. If there is intermittent noise, it means that the rolling parts may be damaged. This sound occurs when the damaged surface is crushed. If there are pollutants in the bearing, it will often cause a noise. Severe bearing damage can result in irregular and large noise.
Bearing damage can be detected by hearing, but usually it has reached the stage where the bearing must be replaced immediately. Therefore, a better method is to use an electronic condition monitoring instrument to pre-diagnose the operation of the bearing.
Compared to the old method (using a wooden stick or screwdriver to the bearing housing and the other end to the ear), advanced equipment can be used to accurately predict the bearing condition.
2, touch
High temperatures often indicate that the bearing is in an abnormal state. High temperatures are also detrimental to the lubricant in the bearing. Sometimes the bearing overheating can be attributed to the lubricant of the bearing. If the bearing runs for a long time at a temperature exceeding 125 °C (260 °F), the bearing life will be reduced, and the high temperature of the bearing may be caused by insufficient lubrication or excessive lubrication, and the lubricant contains Impurities, excessive load, bearing damage, insufficient clearance and high friction caused by oil seals.
Therefore, it is necessary to continuously monitor the bearing temperature, whether it is measuring the bearing itself or other important parts. If the operating conditions are the same, any temperature change may indicate that a fault has occurred.
The periodic measurement of the bearing temperature allows precise measurement of the bearing temperature by means of a thermometer.
The importance of the bearing means that when it is damaged, it will cause the equipment to stop. Therefore, it is better to install a temperature detector for this type of bearing.
Under normal conditions, the bearing will naturally rise in temperature after lubrication or relubrication for one or two days.
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