Angular contact ball bearings can withstand both radial and axial loads simultaneously. Capable of operating at higher speeds. The larger the contact angle, the higher the axial bearing capacity. The contact angle is the angle between the line connecting the contact point of the ball and raceway in the radial plane and the vertical line of the bearing axis. High precision and high-speed bearings typically have a contact angle of 15 degrees. Under the action of axial force, the contact angle will increase. There are raceways on both the inner and outer rings of angular contact ball bearings, and the inner and outer rings can move relative to each other along the axial direction of the bearing. This type of bearing is particularly suitable for bearing composite loads, i.e. loads acting both radially and axially. The axial load bearing capacity of angular contact ball bearings varies with the contact angle α Increase with the increase of. The contact angle is the angle between the line connecting the contact point of the ball and raceway in the radial plane and the vertical line of the bearing axis. The installation quality of angular contact ball bearings will affect the accuracy, service life, and performance of the bearings. Therefore, please thoroughly study the installation of bearings, that is, please follow the operating standards including the following items for bearing installation.
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WSN bearings have high-performance characteristics, but they may be damaged as part of the machine, so some correct methods can extend their service life to a certain extent. 1. Cleaning of bearings When disassembling imported bearings for maintenance, first record the appearance of the bearings, confirm the remaining amount of lubricant, and after sampling the lubricant for inspection, clean the bearings. As a cleaning agent, gasoline and kerosene are usually used. The cleaning of bearing disassembly can be divided into coarse cleaning and fine cleaning. Firstly, place them in a container, and then first place the bottom of the metal wire mesh pad so that the WSN bearings do not come into direct contact with the dirt in the container. During the rough cleaning process, if the bearing rotates with dirt, it will damage the rolling surface of the bearing, so care should be taken. In crude cleaning oil, use a brush to remove grease and attachments. After rough cleaning, please perform a fine cleaning. Fine cleaning is the process of carefully cleaning bearings while rotating with clean oil. In addition, the cleaning oil should also be kept clean. 2. Maintenance of bearings In order to determine whether the removed bearings can be reused, it is necessary to clean the bearing and raceway surfaces, rolling surfaces, matching surfaces, retainer wear, increased bearing clearance, and any related issues Abnormal damage and reduced dimensional accuracy. For non separable ball bearings, support the inner ring horizontally with one hand and then rotate the outer ring to confirm its smoothness. Separate imported bearings, such as tapered roller bearings, can be inspected separately for the raceway surfaces of the rolling element and outer ring. Due to the inability of large bearings to rotate by hand, please pay attention to checking the appearance of the rolling element. The more important the bearing is, the more careful the inspection is required. 3. Criteria for judging whether bearings are damaged The determination of whether it can be reused is based on consideration of the degree of bearing damage, mechanical performance, importance, working conditions, and until the next repair. However, if the following defects cannot be used anymore, the bearings must be replaced with new ones: There are cracks or notched elements and cages in the inner ring, outer ring, and rolling element; There are fractures on either ring or rolling element; 3 raceway surfaces, ribs, and rolling elements; 4. The retainer is significantly worn or the rivets are noticeably loose; 5. Rust and damage to the surface and rolling elements of the raceway; There are severe dents and scratches on the surface of the raceway and rolling elements; The inner diameter surface of the inner ring or the outer diameter surface of the outer ring; 8 obvious discoloration caused by heat; 9. Sealed grease bearings, sealing rings or dust covers are significantly damaged
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1. Reasons for bearing temperature rise: (1) Interruption of bearing cooling water. (2) The quality of oil deteriorates, the oil itself is not clean, or the oil deteriorates during operation. If the water content in the oil increases, the acidity of the oil will increase, which will reduce the lubrication effect of the oil, cause corrosion of the bearing shells, and lead to an increase in temperature. 2. Phenomenon: (1) The alarm clock is ringing. (2) The turbine mechanical fault light on the machine side panel is on, indicating that the instrument temperature for bearing temperature is rising, and the signal relay is activated. (3) The black needle of the thermometer board (expansion thermometer) overlaps or exceeds the yellow needle. (4) Send out a fault signal for bearing temperature rise. 3. When the bearing temperature rises, first determine whether it is a misoperation. If it rises, the following measures should be taken: (1) Check if the cooling water pressure, water flow, and pipeline system are normal. If the water pressure is low, the filter may be clogged and cannot be treated in a timely manner. The treatment can be stopped and confirmed to be operational before putting it into use. (2) Check the oil pressure of the governor. If the oil pressure is low, the cooling water hydraulic valve may close. (3) Check whether there is any abnormal sound in the bearings and whether the bearing swing is abnormal. (4) Take an oil sample, observe if there is any change in the oil color, and conduct a test to see if there is any deterioration. If damage is confirmed, stop the machine and replace with new oil. (5) Check if the oil level is normal. If abnormal, check if the oil tank drain valve is closed. If the seal is tight, oil should be replenished; If there is oil leakage from the sealing rubber gasket, the treatment should be stopped.
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