The power operation starts from no-load low speed, and gradually progresses to the rated operation under the specified conditions. The items to be checked during the test run are whether there is abnormal noise, changes in the temperature of the cylindrical roller bearing, leakage or discoloration of the lubricant, etc. If an abnormality is found, the operation should be stopped immediately, the machinery should be checked, and the bearing should be removed for inspection if necessary. After the ina bearing installation is completed, in order to check whether the installation is correct, it is necessary to stop the operation for inspection. Small machines can be rotated by hand to confirm that they can rotate smoothly. The inspection items include poor operation caused by foreign objects, scars and indentations, unstable torque caused by poor installation and poor processing of the installation seat, excessive torque caused by too small clearance, installation error, and sealing friction, etc. Wait. If there is no abnormality, the power operation can be started. Large machinery cannot be rotated manually, so immediately cut off the power after no-load start, the machinery is idling, check whether there is vibration, noise, whether the rotating parts are in contact, etc. After confirming that there is no abnormality, enter the power operation. The rotation sound of the bearing is checked with a stethoscope, etc. There are strong metal noises, abnormal sounds, irregular sounds, etc. to indicate abnormalities. The reasons are poor smoothness, poor shaft or bearing seat accuracy, damage to cylindrical roller bearings, foreign matter intrusion, etc. For medium and large ball bearings, when the grease is smooth, especially in winter, low temperature and other environmental conditions, there will be a problem of rolling noise. In general, even if the rolling noise occurs, the temperature of the bearing will not rise, and the fatigue life and grease life will not be affected, and it can be used normally. Ina bearing temperature can generally be estimated based on the external temperature of the bearing housing. However, it is more accurate to use the oil hole to directly measure the temperature of the bearing outer ring. The bearing temperature gradually increases from the beginning of operation, and usually stabilizes after 1 to 2 hours. If the ina bearing device is not good, the temperature will rise sharply, showing an abnormally high temperature. The reasons are such as too much lubricant, too small clearance of cylindrical roller bearing, poor installation, too large friction of seal installation, etc. In places where high-speed rotation occurs, the wrong choice of bearing structure and smoothing method is also the reason. The method of grease lubrication has the characteristics of simplicity and ease of operation and convenient replacement of rolls, and is widely used. Appropriate grease should be selected according to the operating temperature, speed, rolling force, sealing and waterproof performance, impact and vibration size, and grease supply method of the rolling mill bearing. It is necessary to choose grease from regular manufacturers with high temperature resistance, strong viscosity, good extreme pressure performance and high water resistance. According to the working characteristics of rolling mill bearings, 2, 3, lithium-based grease or polyurea grease containing ep additives should be selected. Although the purchase cost of high-performance grease is high, the consumption is small, the bearing life of ina is long, and the total comprehensive cost is reduced. In addition, the filling amount of grease must be appropriate and in place, and greases of different grades cannot be mixed, so that the working surface of the rolling mill bearing is always in a normal state of oil film. When filling the grease for the first time, the inner space of the cylindrical roller bearing can be filled up. For the vertical roller or inclined roller, a sufficient amount of grease should be filled in the upper and lower covers of each bearing seat. After each roll change, check whether the grease has hardened and turned black, whether it is contaminated by impurities, and whether it is oxidized and emulsified. If the above situation occurs, the grease should be completely replaced and the seals and sealing structure should be checked and replaced or improved in time; Oil-air lubrication is the ideal lubrication method for bearings. During the operation of the bearing, the compressed air brings lubricating oil droplets into the bearing at regular intervals, and the lubricating oil remains inside the bearing. The air takes away the heat of the bearing during operation and prevents external Impurity water vapor is immersed inside the cylindrical roller bearing. The oil is not atomized and does not pollute the environment.
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