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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Analysis of the cause of early failure of high-square flat screen drive shaft bearing Analysis of the Causes of Early Failure of Gaofangping Screen Drive Shaft Bearings
Gaofangping sieve is one of the main engines of milling. From the mid-1980s to the early 1990s, the grain machine manufacturers have successively dealt with the cracking and smashing and powder leakage of Gaofangping sieve. In recent years, there are often flour manufacturers reflecting; The high-square flat screen drive shaft bearing will be damaged in a short time (ie, early failure); the production will be affected by stopping the replacement of the bearing. After replacing the bearing; some high-square screens work well; the working time is long, and some high-square screens are in In the short time, the bearing premature failure occurred again. This problem was solved. The author carried out the necessary calculations and analysis; it was thought that the early failure of bearing formation had the following reasons. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1. The device is not suitable. At present, the manufacturer and application manufacturer of Gaofangping Screen in China; when the device or the drive shaft bearing and the bushing are disassembled; basically, the mechanical tapping method is selected. When the device is mounted, if the force is uneven; Excessive force; improper force point or improper installation; simply make the bearing in the bearing housing and the drive shaft in an incorrect orientation; after forming the bearing device, there is a certain potential quality problem. The device is not properly installed; the transmission system is formed. The upper and lower bearings are unevenly stressed; the bearings with large force are simply damaged early.
According to the calculation of many years; the device does not properly form the proportion of the early failure of the high-square screen drive shaft bearing; about 15% of the total early failure of the high-square screen drive shaft bearing.
2, smooth and unsuitable China's high-square flat screen most of the choice is 53620C3, 53b22C3 (GB 288-1987) or 22320E; 22322E (GB/T 288-1994) and other spherical roller bearings; are unsealed bearings It is not a "free protection" sealed bearing; this requires regular timing to compensate for the smooth grease. Because of the different understanding of the use of smooth grease; different flour mills can use different smooth grease. Good quality manufacturers use quality Good, high-priced smooth grease; manufacturers with poor performance use smooth grease with poor quality and low price; or what kind of smooth grease can be used to buy what kind of smooth grease; no matter how smooth the effect of smooth grease is; This will form the same type, the same batch of high square flat screen drive shaft bearing failure time is very different.
In the process of application; the primary form of slickness and its causes are:
1 smooth grease is not enough. This is mainly because the flour mill does not make up the smooth grease on time according to the requirements of the high square screen operation manual; does not open the exhaust screw plug on the high square flat bearing cap; when adding the smooth grease with the grease gun Can only make up for less smooth grease; the bearing is not smooth enough.
2 smooth fat plus too much. This is mainly due to the fact that the smoother grease adds more people to the better the bearing. The excessive amount of smooth grease is involved in the bearing cavity and the bearing seat; the heat dissipation is difficult; the bearing temperature rise is accelerated; Early failure of the bearing.
3 There is no smooth grease; there is a conflict between the bearing ball and the inner and outer rings of the bearing and the cage. This occurs mainly in the upper bearing of the high square screen. During the continuous operation; the drive shaft (or bushing) and the upper bearing The seal has relative motion; if the drive shaft (or bearing) is rough; the seal ring is worn; the seal effect is not achieved; the smooth grease in the upper bearing cavity flows downward along the drive shaft (or bushing); forming the upper bearing cavity Dry conflict without smooth grease; increased bearing early failure.
Totally; any smoothness will result in early failure of the bearing. According to several years of calculation; smoothness does not form the proportion of high-level flat screen drive shaft bearing early failure; about 35% of the total early failure of the high-square screen drive shaft bearing.
3. The contaminated bearing is a fine part; if the bearing or its smooth grease is contaminated; the bearing will not work properly. The high square flat screen drive shaft bearing is in the process of producing the device; because the device environment is poor; when the device bearing or adding smooth grease to the bearing Simple formation of bearings and smooth grease with different degrees of pollution; that is, contaminants (foreign substances) invade the bearing cavity or smooth grease; the working environment of the bearing is deteriorated; the work cannot be used early and fails. On the other hand, the high square screen is working. In the process; because the sealing of each component is poor (top grid, discharge bottom plate, screen door and sieve box seal is not good); leakage powder and dusting outside; simple formation of flour particles, dust and other pollutants invading the bearing cavity; The working environment of the bearing is contaminated; the bearing cannot work usefully; it fails early.
According to the calculation; because the bearing and smooth grease are contaminated; the premature failure of the bearing accounts for about 20% of the total failure of the high-level flat screen drive shaft bearing.
4, fatigue mechanical equipment overload and improper use or protection; bearings will be affected; incurs the bearing premature fatigue and early failure. In the process of making high square screen; if its transmission shaft bearing two devices are not the same heart; coaxiality The difference is large; the adjustment of the self-aligning bearing can not make up for the error; the high-square screen is in the working process; the upper and lower bearings can be in an abnormal overload condition. In addition, during the installation and debugging of the high-square screen; the drive shaft lead is not found. Vertical orientation; forming the upper and lower bearings in an abnormal overload condition. Again; usually the flour mill's work must exceed its portrayal ability; this can improve economic efficiency; recover capital money; but form an overloading operation of the milling equipment Gao Fangping sieve is not an exception; if it is super-characteristic output value work; it is necessary to increase the high square flat screen reversal circle; to increase the output value; improve the screening power; then form a high square screen overload work; the upper and lower bearings are in overload working condition. These conditions will lead to premature exhaustion of high-square flat screen bearings; early failure.
According to the calculation; due to the high-level flat screen overload work; the bearing premature fatigue and early failure share; about 25% of the total failure of the high-square flat screen drive shaft bearing early failure.
5, other reasons for the poor quality of the bearing and the poor quality of the inner hole of the bearing housing and other reasons for the early failure of the bearing; about 5% of the total failure of the high-level flat screen drive shaft bearing early failure.
Total failure; early failure (damage) of Gaofangping screen drive shaft bearing is mainly caused by improper installation, smoothness, contamination of bearing and smooth grease, fatigue of bearing overload and other reasons (quality of bearing body, machining quality of inner hole of bearing housing), etc. Therefore, it should be further improved and improved in the production, engineering equipment, and application protection of the high-square screen; the maximum limit is reduced to the occurrence of early failure (damage) elements of the high-square screen drive shaft bearing; the reliability of the high-square screen drive system is improved. Cut the stoppage and repair time of the high square screen; make the flour company invent better economic benefits.
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Analysis of the Causes of Early Failure of Gaofangping Screen Drive Shaft Bearings
Source: Bearing network time: 2014-03-29