Role:
Bearings are an important part of modern mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient in the process of movement and ensure rotational accuracy.
1. According to the different frictional properties of the moving elements, bearings can be divided into two categories: rolling bearings and sliding bearings. Among them, rolling bearings have been standardized and serialized, but compared with sliding bearings its radial size, vibration and noise is larger, the price is also higher.
2.Plain bearings: bearings that work under sliding friction. Sliding bearings work smoothly, reliably and without noise. In liquid lubrication conditions, the sliding surface is lubricant separate and not direct contact, but also can greatly reduce friction loss and surface wear, oil film also has a certain vibration absorption capacity, but the starting friction resistance is larger.
3. Ball bearings: contain four basic components, i.e. ball, inner ring, outer ring and retainer. The ball is located between the inner ring and outer ring, and the retainer is responsible for keeping the ball within the same distance, thus allowing the bearing to work normally.
Maintenance of bearings.
1. Cleaning.
When taking the bearing off for inspection, first make a record of its appearance by photography etc. Also check the amount of lubricant remaining and sample the lubricant before cleaning the bearings. Cleaning of bearings is carried out in rough and fine washes and can be carried out by placing a metal mesh frame at the bottom of the container used. Usually the cleaning agent used is a neutral, water-free diesel or paraffin, but sometimes a warm alkaline solution is used as required. Immediately after cleaning, rust-proof oil or rust-proof grease is applied to the bearings.
2. Inspection and judgement.
In order to judge whether the dismantled bearing can be reused, we should focus on checking its dimensional accuracy, rotational accuracy, internal clearance and mating surface, raceway surface, cage and sealing ring. About the inspection results, can be used by the habitual bearing or proficient bearing people to judge. The criteria for judgement vary according to mechanical properties and importance as well as inspection intervals. If there is any of the following damage, the bearing must not be reused and must be replaced.
Bearing damage and countermeasures.
1. Bearing damage.
Generally if the bearings are used correctly, they can be used until they reach their fatigue life. But there will be accidental premature damage, can not be resistant to the use of the situation. This early damage, and fatigue life, as opposed to the quality of the use of the limit is called failure or accident. Most of the damage is caused by inattention to installation, use, lubrication, foreign objects from the outside, insufficient research on the thermal effects of the shaft and housing, etc.
2. Bearing damage countermeasures.
Roller bearing collar, retaining edge of the card injury, as the cause can be considered, lubricant is not enough, not suitable, supply and drainage structure defects, foreign body invasion, bearing installation error, shaft deflection is too large, there will also be these reasons overlap. Therefore, only know the use of bearing machinery, use conditions, bearing around the structure, understand the situation before and after the accident, combined with the damage state of the bearing and several causes to examine, it can prevent similar accidents from happening again.
