Ntn roller bearing in use failure daily maintenance precautions

After the ntn bearing is installed, check the operation in order to check if the installation is correct. The small machine can be rotated by hand to confirm whether the rotation is smooth. The inspection items have poor operation due to foreign matter, scratches, and indentations. The installation is poor, the torque generated by the mounting is not stable, and the torque is too large due to too small clearance, installation error, and sealing friction. Wait. If there is no abnormality, the power running can be started. Large machinery cannot be rotated manually, so the power is cut off immediately after the start of the no-load, the machine is idling, and the presence or absence of vibration, noise, and contact of the rotating parts is checked. After confirming that there is no abnormality, the power is turned on. The power running starts from the no-load low speed and slowly increases to the rated operation of the specified conditions. The items to be checked during the test run are whether there is abnormal sound, change in the temperature of the roller bearing, leakage or discoloration of the lubricant, and the like. If an abnormality is found, stop the operation immediately, check the machine, and remove the bearing check if necessary.
The temperature can generally be estimated based on the external temperature of the bearing housing. However, it is more accurate to directly measure the temperature of the outer ring of the ntn bearing by using the oil hole. The bearing temperature gradually rises from the start of the operation, and the temperature is usually stable after 1 to 2 hours. If the roller bearing is poorly installed, the temperature will rise sharply and an abnormally high temperature will occur. The reasons are such as excessive lubricant, too small bearing clearance, poor installation, excessive friction of the sealing device, and the like. In the case of high-speed rotation, the selection of the structure and lubrication method is also the cause.
1) Wash the bearing with kerosene, press it into the bearing seat, fill the roller of the bearing outer ring with Shell No. 3 lithium base grease to two-thirds full, apply evenly with the net hand, install the ntn bearing gland, apply with the coating The fastening bolt of the bolt anti-slipping rubber is pressed against the bearing gland;
2) The bearing is a cylindrical roller bearing with a detachable inner casing. The bearing should be placed on the rotating shaft and placed in place;
3) Mount the bearing housing on the casing. If there is grease grease hole, it must be aligned. Pressing the bearing block with the fastening bolts of the anti-loosening rubber;
4) The inner and outer eccentric blocks are mounted on the rotating shaft and are in place. If there is an axis key, the shaft key should be inserted into the keyway and then the outer eccentric block should be installed, and the shaft can be mounted on the rotating shaft with the retaining ring;
5) Tightly fix the eccentric block fastening bolts and turn the adjustable eccentric block to the angular position before the unloading and tighten the fastening bolts. After the above assembly is completed, the shaft should have a certain axial movement;
6) The protective cover on both ends of the upper vibration motor is fastened with screws.
The imported bearings have certain changes to the installation form of the vibration motor and other aspects of the performance, and the form considered from different angles has a certain change effect, and slowly the installation situation of all aspects has also been I understand it.
The use factors mainly refer to whether the installation adjustment, use and maintenance, maintenance and repair, etc. meet the technical requirements. The installation condition is one of the primary factors in the use factor. The ntn bearing often changes the force state between the parts of the whole set of roller bearing due to improper installation, and the bearing runs in an abnormal state and fails early. According to the technical requirements of bearing installation, use, maintenance and maintenance, monitor and check the load, speed, working temperature, vibration, noise and lubrication conditions of the ntn bearing in operation, find out the cause and immediately adjust the cause, make adjustment It returned to normal. In addition, it is important to analyze the quality of the grease and the surrounding medium and atmosphere.

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Ntn tapered roller bearing to adjust the rotation accuracy of regular lubrication maintenance

After the ntn bearing is installed in the main machine, if the radial runout of the tapered roller bearing main shaft is measured, it can be found that the measured value of each revolution has a certain change; when the measurement is continuously performed, it can be found that after a certain number of revolutions, this Changes will repeat approximately. The index for measuring the degree of change is the cyclic rotation precision, and the change approximately repeats the required number of revolutions to represent the "quasi-period" of the cycle rotation accuracy. The magnitude of the magnitude change in the quasi-period is large, that is, the cycle rotation precision is poor. .
1, grease lubrication
Relubrication of ntn bearings is best carried out during planned equipment downtime and is periodically replenished, while removing old grease or extruding old grease through the drain. Wipe the grease fittings clean before adding fresh grease. If the bearing housing does not have a grease fitting, the bearing housing cover or end cap should be opened to remove the old grease and, after cleaning, replenish the same type of fresh grease.
2, lubricating oil lubrication
Regularly check the oil level and oil quality of the lubricating oil. Under normal circumstances, the normal oil level should be within the range of 1/3-2/3 of the equipment oil level window or mark. The oil filling method is oil cup, the oil level shown only represents the oil replenishing capacity, and the bearing tank oil level is to meet the operation requirements. The oil level in the oil cup is less than 1/4 of its total volume.
Check and replenish the oil method, take a small amount of lubricating oil as a sample and compare it with fresh oil. The competent unit can consider the oil quality test to ensure the oil quality is qualified. If the sample looks cloudy, it may be the result of mixing with water, which is commonly referred to as oil emulsification. At this point, the lubricant should be replaced. Installation of the fixed-end front bearing on the shaft: Thoroughly clean the tapered roller bearing with clean cleaning kerosene. For grease lubrication, firstly inject the organic solvent containing 3% to 5% grease into the ntn bearing for degreasing and cleaning. Use a grease gun to fill the bearing with a certain amount of grease (10% to 15% of the bearing space volume); heat the bearing to raise the temperature by 20 to 30 °C, load the bearing into the shaft end with a hydraulic press; press the adapter sleeve on the shaft And axially position the bearing end face with appropriate pressure; wind the belt of the spring balance on the outer ring of the bearing, and check whether the specified preload has a large change by measuring the starting torque (even if the taper rolls The sub-bearings are correct, but the preload is also subject to change due to the deformation of the fit or cage.

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