Checking the condition of the machines in operation and preparing a thorough inspection plan has become more and more serious. Among them, the bearing is the focus of attention, because it is the most important rotating part in all machines. Condition monitoring is an important part of preventive maintenance. Early detection of bearing damage to avoid equipment downtime during unplanned maintenance due to bearing damage. However, not all of them are equipped with this advanced instrument. In this case, the operator or maintenance engineer of the machine must be highly alert to the "fault signals" of the bearing, such as noise, temperature and vibration. "Listening", "touching" and "observing" are three important factors. The views provided below can be used as your reference.
High temperature often indicates that the bearing is in abnormal condition. High temperatures are also harmful to the lubricants in SKF bearings. Sometimes bearing overheating can be attributed to the lubricant of the bearing. Long-term operation of the bearing at a temperature exceeding 125 degrees Celsius will reduce the life of the bearing. The reasons for the high temperature of the bearing include: insufficient or excessive lubrication, impurities in the lubricant, and excessive load , Bearing damage, insufficient clearance, and high temperature friction caused by oil seals, etc. Therefore, continuous monitoring of bearing temperature is necessary, whether it is measuring the bearing itself or other important parts. If the operating conditions do not change, any temperature change may indicate that a malfunction has occurred.
The bearing temperature can be measured regularly with the help of a thermometer, which can accurately measure the bearing temperature and display it in degrees Celsius. The important bearing means that when it is damaged, it will cause the shutdown of the equipment, so it is best to install a temperature detector for this type of bearing. Under normal circumstances, the bearing will have a natural temperature rise just after lubrication or relubrication and it will last for one or two days.
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2.轴承间隙的选择:用户在购买轴承时，一般只告知型号和等级，很少询问轴承的间隙。业务人员必须询问轴承的操作条件，轴承的速度和温度。配合公差直接关系到轴承间隙的选择。一般情况下，转速低于3500 rpm的电机大多采用CM间隙，如高温和高速电机，要求间隙比较大。装配后，轴承间隙会由于内孔的膨胀和外圆的收缩而减小。间隙的减少=干涉量× 60%(轴承室为铝除外)。例如，轴承装配前的间隙为0.01mm，装配期间的过盈量为0.01mm，则轴承装配后的间隙为0.004mm。理论上，有零间隙时轴承的噪声和寿命达到最佳状态，但在实际运行中，考虑到温升等问题，装配后轴承的间隙最好为0.002mm-0.004mm。