In order to maintain the bearing under good conditions, it should maintain its proper performance and long-term use. Bearings must be inspected and maintained. Inspection and maintenance are important to prevent malfunctions. During operation, it is important to check the rolling noise, vibration, temperature and lubricant of the bearings.
Under the conditions of high speed and high temperature, the adjustment scheme of the combined position and clearance of the outer spherical bearing can be oil lubricated when the grease lubrication is not suitable. A large amount of heat can be taken away by the circulation of the lubricating oil. Viscosity is an important characteristic of lubricating oil. The viscosity directly affects the fluidity of lubricating oil and the thickness of oil film formed between friction surfaces. The viscosity of lubricating oil at INA bearing working temperature is generally 12-15cst. The higher the speed, the lower the viscosity, and the heavier the load, the higher the viscosity. Commonly used lubricating oils include mechanical oil, high-speed mechanical oil, turbine oil, compressor oil, transformer oil, cylinder oil, and the like.
Oil lubrication methods include:
a. Oil bath lubrication
Oil bath lubrication is the most common lubrication method. It is suitable for the lubrication of low and medium speed bearings. Part of the bearing is immersed in the groove. The lubricating oil is brought up by the rotating bearing parts and then flows back to the oil groove. The oil level should be slightly lower than the minimum. The center of the rolling element.
b. drip lubrication
Drip lubrication is suitable for the outer spherical bearing parts that need to be quantitatively supplied with lubricating oil. Considering the structural design of the bearing supporting parts during thermal expansion, the amount of dripping is generally one drop every 3-8 seconds, and excessive oil quantity will cause the bearing temperature to increase.
c. Circulating oil lubrication
The filtered oil is delivered to the bearing components by an oil pump, filtered through the lubricating oil after the bearings, and then cooled and used. Since the circulating oil can take away a certain amount of heat and cool the bearing, this method is suitable for INA bearing parts with high speed.
d. Spray lubrication
The dry compressed air is mixed with the lubricating oil through a sprayer to form an oil mist. In the jet bearing, the air flow can effectively cool the outer spherical bearing and prevent the intrusion of impurities. This method is suitable for the lubrication of high speed, high temperature bearing components.
e. Injection lubrication
The high-pressure oil is injected into the bearing through the nozzle by the oil pump. The basic formula of the fatigue life calculation of the rolling bearing is injected into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling elements and the cage also form a gas flow at the relatively high rotation speed of the surrounding air. It is difficult to send the lubricating oil to the bearing by the general lubrication method. At this time, the lubricating oil must be sprayed by the high-pressure injection method. In the bearing, the position of the nozzle should be placed between the inner ring and the center of the cage.
Many reasons for the failure of the bearing, in addition to the normal fatigue spalling, such as failure of the seal, too small bearing clearance caused by over-tightening or poor lubrication can leave special failure marks and failure forms. Therefore, the failure of the bearing is checked in most Time can be found to cause the failure of the bearing and take countermeasures in time. Generally speaking, 1/3 of the failure of the INA bearing is because the bearing has reached the normal failure of the fatigue spalling period; 1/3 because of poor lubrication, leading to premature failure 1/3 because of pollution The material enters the bearing or is incorrectly installed, causing the bearing to fail prematurely. Generally speaking, when the outer spherical bearing is not working properly, there are seven common symptoms: bearing overheating, excessive bearing noise, low bearing life, high vibration, and no machine. Performance requirements, the bearing is loose on the shaft, and the shaft is difficult to rotate.
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