The maintenance and protection of the bearing is very important. It is related to its service life, working efficiency, knowing how to solidify the bearing to protect and maintain the bearing used by itself. It benefits a lot, and it gives you high production efficiency from the operation point of view. Producing high-quality products, economically, several times of protection can extend life to save you the cost of a de novo acquisition.
Bearing is an important component in mechanical equipment. Its main function of powder metallurgy bearing is to support the mechanical rotating body, reduce the conflict coefficient in the course of its movement, and ensure its rotation precision. According to the conflicting nature of moving components, bearings can be divided into two categories: rolling bearings and sliding bearings. In the meantime, the rolling bearing has been standardized and serialized, but its radial dimension, vibration Du bushing and noise are larger than the sliding bearing, and the price is also high.
Sliding bearing: A bearing that operates under sliding conflicts. Sliding bearings work smoothly, securely and without noise. Under the condition of smooth liquid, the sliding surface is separated by smooth oil without direct touch, and the collision loss and appearance wear can be greatly reduced. The oil film also has a certain vibration absorbing ability, but the starting conflict resistance is large.
Rolling bearings are precision mechanical components that change the sliding conflict between the working shaft and the shaft seat into a rollover conflict and then reduce the loss of collision. The rolling bearing is generally composed of an inner ring, an outer ring, a rolling body and a holding frame.
Bearing storage
The bearings are coated with an appropriate amount of anti-rust oil at the factory and packed with anti-rust paper. Only the packaging is adhered to, and the quality of the bearing can generally be guaranteed. However, when storing for a long time, if the humidity is lower than 65% and the temperature is about 20 °C, it is preferable to store it on a shelf higher than 750px above ground. In addition, the storage place should avoid direct sunlight or contact with the cold wall.
How to clean the bearings?
When the bearing is removed and viewed, the appearance is recorded by shooting. In addition, it is necessary to acknowledge the amount of smoothing agent left and sample the smoothing agent before cleaning the bearing.
a. The cleaning of the bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container.
b. When rough washing, remove the smooth grease or adherent with a brush or the like on the top of the oil. If you roll the bearing in the oil at this moment, be aware that the rolling surface will be damaged by foreign matter.
c. During the fine washing, the bearing is gradually rolled in the oil and must be carefully carried out. The cleaning agent generally used is a neutral non-aqueous diesel oil or a kerosene, and a warm lye or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often necessary to filter and keep clean. Immediately after cleaning, apply anti-rust oil or anti-rust grease to the bearing.
View and discriminate
In order to determine whether the removed bearing can be used from the beginning, it is necessary to focus on its dimensional accuracy, rotation accuracy, internal clearance and cooperation surface, raceway surface, holding frame and sealing ring. Because large bearings cannot be rotated by hand, pay attention to the appearance of the rolling body, raceway surface, holding frame, and retaining edge. The higher the importance of the bearing, the more stable it is.
Regarding the results of the inspection, it can be judged by the use of the conventional bearing or the bearing. The specification of the discrimination differs depending on the mechanical function and importance, the viewing period, and the like. Bearings must be replaced if the following damage occurs. 1) Cracking and shortcomings of bearing components. 2) Peeling of the rolling surface of the raceway surface.
Pay attention to the key points
From the application point of view, to ensure that the bearing can work securely, pay attention to the following points: 1. Improve the smooth quality, control the pressure, temperature and flow of the oil, and strengthen the oil filter. 2. Select the fuel and smooth oil that meet the requirements. 3. Manipulating the temperature condition of the diesel generator set, the operation is helium in the case of overcooling and overheating. On cold weather, the diesel engine should be preheated before starting, and the crankshaft should be rolled by hand to make the oil enter the friction surface. 4, bearing and journal appearance quality and a few shapes should be strictly guaranteed. 5, the bearing clearance should be appropriate, the generator set is too large impact, too small is smooth and bad, may burn the tile.
1. The bearing clearance should be appropriate, the impact will be too large, and if it is too small, it will be smooth and bad, and it may burn the tile; The bearing and journal appearance quality and several shapes should be strictly guaranteed; Improve the smooth quality, control the pressure, temperature and flow of the oil, and strengthen the oil filter; Use qualified fuel and smooth oil.
Smooth bearing method
Closed (with seal) bearings are generally grease smooth
No special oil supply system is required, and the sealing equipment is simple, the repair cost is low, and the smooth grease cost is lower than the first strength. It is widely used in bearings with low speed, medium speed and medium temperature operation. In particular, in recent years, the anti-wear additives have been developed and developed, and the smooth function of the grease has been improved, so that the smoothness of the grease has been more widely used. The variety and filling amount of the smooth grease and the bearing structure are related to the detailed industrial and mining. Bearings that are lower than the oil smoothing method;
Open bearings generally use oil smooth
1) Smooth oil bath
Suitable for low and medium speed bearings. When using this method, pay attention to the oil quantity control. The oil level should be slightly lower than the center line of the lowermost bearing rolling body. Excessive oil quantity will cause excessive temperature rise. Stirring, the lack of oil will constitute the failure of the bearing in the early stage, and it is recommended to check (adhere) the appropriate oil level with the oil level indicator.
2) Smooth dripping oil
The smooth drop of oil is the use of the weight of the smooth oil, drop by drop to the conflict. An oil-filled needle-type oil-filling cup is provided at the oil supply portion. This sleek method is mostly used for a small number of conflicting pairs that are simple and close, such as the smoothness of machine guides, bearings, gears, chains, etc. When the bearing parts need to be supplied with smooth oil quantitatively, the drip oil can be selected to be smooth. The amount of oil to be dripped is generally one drop every 3 to 8 seconds, because the excessive oil quantity will cause the bearing temperature to increase.
3) Smooth circulating oil
When the bearing operation speed is high, the bearing temperature rise will be added accordingly, so the aging of the oil occurs. The smoothness of the circulating oil can be used to avoid the above phenomenon. The smooth oil is pumped to the bearing component through the oil, and an oil inlet is installed at one end of the bearing, and an oil outlet is installed at the other end of the bearing. The smooth oil after passing through the bearing can be recycled after being filtered and cooled. Since smooth oil can carry a certain amount of heat during the circulation process and then ensure that the bearing is always operated at a lower temperature, this method is suitable for bearing parts with a higher rotational speed. However, it should be noted that the oil outlet should be larger than the oil inlet so that no oil remains in the bearing housing.
4) Smooth spray
When the bearing is operated at a low-to-medium load speed, the roll and the holder are also rotated at a suitably high rotational speed to cause an air vortex around the bearing. In order to ensure that a satisfactory amount of smooth oil is supplied to the bearing at high speed, it is necessary to spray the smooth oil into the bearing from the end of the bearing by high pressure ejecting and smooth the bearing, and then the oil flows from the other end into the tank from the other end. In order to use this method and to perform the smooth bearing usefully, it should be noted that the orientation of the high pressure nozzle is located between the inner ring and the center of the holder, and the eruption speed of the smooth oil should be not less than 15 m/s and the oil is directly injected into the bearing.
5) Oil and gas smooth
When the bearing is operated under high speed and high temperature load, the mixture of compressed air and a small amount of smooth oil is used to spray the oil mist into the bearings of each operation. This method can be compared with other smooth methods to make it run at the lowest temperature, so the maximum speed of the bearing can be guaranteed. The high pressure gas stream can be used to cool the bearings and can also be used to avoid intrusion of impurities.
6) Solid smooth
If the oil is smooth and the grease is not smooth enough to meet the smooth conditions required by the bearing, or if the specific working conditions are not satisfactory, then a solid smoothing agent can be used, or the smooth function of the bearing itself can be improved. Under satisfactory conditions, a small amount of solid smoothing agent will participate in the smooth grease. For example, taking part in 3 to 5% of molybdenum disulfide No. 1 can reduce wear and improve resistance to heat and pressure. About high temperature, high pressure, high vacuum, corrosion resistance, Special conditions such as anti-radiation and extremely low temperature, the solid smoothing agent can be made into engineering plastics or powder metallurgy materials, and can be made into bearing parts with self-smoothing function, such as bonding the solid smoothing agent to the raceway with an adhesive. Adhere to the frame and the roll body to form a smooth film, which has a certain effect on reducing conflict and wear.
The choice of the smooth method of the bearing is an inductive discriminating process. To make the bearing smooth and reasonable, it is necessary to summarize the various factors such as the mechanical structure, the bearing device, the bearing receiving load and the detailed production environment. With the continuous development of science and technology and the change of new materials and production processes, the use of smoothness to avoid the failure of mechanical parts is a subject of continuous development and improvement. It should also be considered by the vast number of technology operators and practitioners in the machinery industry. .
The bearing is an important and important base component in the manufacturing operation. It is directly equipped with the function, quality and reliability of the main equipment and the main product. It is known as the “heart” component. Doing a good job of bearing protection and maintenance is of great significance to the safe operation of machinery and equipment.
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