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Measures to solve common failures of sliding bearings

Author:admin   Date:2022-07-14
Sliding bearings are generally composed of a bearing body and a softening system. During operation, the journal rotates in the bearing to drive the lubricating oil to form a dynamic pressure oil film, which is supported by the pressure of the oil film and the external load to ensure the flexible rotation of the journal. Then, to solve the problem of sliding What are the common faults of bearings?

1. The sliding bearing is normally worn. The working surface of the bearing is smooth and flat, and the wear rate of the bearing is usually close to a constant value. When the accumulated wear amount is greater than the design allowable wear value, the bearing will fail and die into a wear and tear. The main reason for the wear is the overload or overspeed operation of the unit. ; The lubricating oil contains too many magazines, poor lubrication, poor bearing running-in, etc.

Methods and measures to reduce normal wear and tear failures: ensure the lubrication of the bearings in normal operation, maintain and maintain the lubrication system and sealing system of the unit in time, replace the lubricating oil, and ensure that the particle content and size in the lubricating oil are within the allowable range. Run according to operating procedures. Avoid running the bearing under overload and overspeed conditions.

2. Sliding bearing scratches. The direct metal contact between the bearing and the journal surface produces fine and shallow plough marks. The main reason is that the oil film pressure of the sliding bearing is not enough, the lubricating oil is too little, or the oil inlet pipeline is broken or the lubricating oil is not enough during the start or stop of the unit. mixed with other impurities.

3. Gluing phenomenon. Sliding bearings occur when the unit is overloaded, the local load of the bearing is too high, overheated, lack of lubricating oil, the bearing seat vibrates, etc., the bearing seat temperature rises rapidly, so that the bearing and the shaft mating surface are in direct contact and partially fused together.

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Methods and measures to prevent sliding bearings from gluing: Avoid overloading the unit. Improve the bearing assembly quality and lubricating oil cleanliness, and avoid excessive local load on the bearing. Improve the oil supply system of lubricating oil to avoid running without oil. Strengthen the connection rigidity of the bearing seat to avoid the vibration of the machine seat.

4. Corrosion damage. Due to the chemical reaction between the surrounding medium and the working surface of the bearing, the sliding bearing causes the working surface of the bearing to be black or dull discoloration, isolated and discontinuous fluff, or randomly distributed pits, honeycombs or irregularities of connected pits.

Causes of sliding bearing abrasion: the lubricating oil is oxidized or polluted; the bearing is poorly anti-wear; the bearing anti-friction material contains harmful impurity elements; the working surface of the bearing has parasitic current passing through it.

5. The oil film oscillation of the sliding bearing is a harmful vibration, which makes the rotor more deviated from the bearing center and increases the instability factor of the rotor. Oil film oscillation causes alternating stress, which will lead to fatigue failure of lubricated moving bearings.

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