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Analysis of the causes of the bearing problems and treatment
Source: Bearing network time: 2018-01-14
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The dynamic bearing is affected by its own quality and external conditions during its operation; its bearing ability, rotation accuracy and wear resistance will change. When the function index of the bearing is lower than the application demand and cannot work normally; the bearing will suffer from problems or even failure; after the accident occurs, such as the failure of the bearing, the machine and equipment will stop; and various abnormal phenomena such as utility loss will be presented; The need to detect the cause of the attack in a short period of time; and adopt the corresponding approach.
In order to make the bearing in the outstanding conditions can adhere to the function and long-term use. It is necessary to view and protect the bearings; inspection and protection are important to prevent problems; in the operation, you should check the bearing's tumbling, oscillation, temperature and smoothing agent.
1. The bearing tumbling roll bearing noise is one of the bearing's own attack; that is, the inherent noise of the bearing, and the other is the noise that occurs after the bearing is installed; it has nothing to do with the noise of the bearing itself. After listening to the sound, you can split some questions. a) Inherent noise: raceway sound "All kinds of bearings and tumbling conflict sounds (cylindrical roller bearings) are the inherent sound of rolling bearings. The rolling track sound is caused by the elastic characteristics of the rolling body and the raceway; when the bearing rotates; the rolling body rolls over the raceway and announces a continuous and slippery sound; abnormal tumbling conflict can be declared. Uncomfortable metal conflicts such as squeaking and squeaking are unusual sounds; such sounds are not announced when sleek is outstanding. So it is not a problem under normal conditions; as long as the noise increases, you need to pay attention. b) noise related to bearing production: this includes the bracket noise and vibrato; the main cause of the rack noise is in the ball bearing and the tapered roller bearing; when the bearing rotates, because of the oscillation of the bracket and the collision of the frame and the rollover Will announce the sound. This sound has a periodicity. Vibrato (various bearings) is a sound with a certain frequency; it is caused by the oscillation caused by the large waviness on the raceway surface. c) The use of improperly induced noise: all kinds of bearings exist. When the bearing raceway or the tumbling outer surface is bumped, crushed, or rusted, there will be a certain period of noise and oscillation. Contaminant noise occurs when the bearing invades dust during operation. This kind of noise is the same as the periodicity of the error, and it is accompanied by oscillation. The sound is not fixed; sometimes it is not.
2. The oscillation of the oscillating bearing of the bearing has a significant effect on the failure of the bearing. For example: shedding, indentation, rust, cracks, wear, etc. will be reflected in the bearing oscillation detection. Therefore, after selecting the special bearing oscillation measuring equipment (frequency analyzer and oscillator, etc.), the amplitude of the oscillation can be measured and the frequency dispersion can be inferred. The measured value of the abnormal condition of the abnormal oscillation is different depending on the operating conditions of the bearing or the orientation of the sensor device. Therefore, the measurement value of each machine is analyzed beforehand and the specification is determined.
3. The temperature of the bearing usually reaches the steady state after the temperature of the bearing gradually rises from the beginning of the operation for 1 to 2 hours. The normal temperature of the bearing is different due to the heat capacity, heat dissipation, speed and load of the machine. If it is smooth and the equipment is not suitable, the bearing temperature will rise sharply and the abnormal temperature will rise. It is necessary to stop and adopt the necessary precautions.
4. The smoothness of the smoothing agent has an important influence on the fatigue life of the rolling bearing and the conflict, wear, temperature rise, oscillation, etc., and the smooth bearing without normal operation cannot be operated. Analysis of the damage of the bearing is marked by the bearing damage of about 40% is related to smoothness. Thus the outstanding smoothness of the bearing is a useful way to reduce bearing conflict and wear. In addition, the smoothness of the bearing also has the effect of heat dissipation, rust prevention, sealing, and flat cushioning. Make sure that the smoothing agent does not expire and the selection is correct. The harvester's bearings are smooth and smooth, and the grease is smooth. The two large gearboxes are smooth and GL-5 80W90 gear oil is used. The grease is smooth and usually uses a molybdenum disulfide lithium-based smooth grease smoothing torque booster. It is necessary to use Mobil XHP222 or better grease to smooth.
The failure of the bearing is due to a number of factors other than normal fatigue shedding, such as failure of the seal, over-small bearing clearance or poor smoothness, which can leave special failure marks and failure methods. Therefore, viewing the failed bearing can find the cause of the bearing failure in most of the time and then adopt the countermeasure in time. Generally speaking, one-third of the failure of the bearing is due to the fact that the bearing has now reached the normal failure due to the fatigue loss period; 1/3 because the smoothing failure causes early failure 1/3 because the contaminant enters the bearing or the equipment is incorrect, which constitutes the early failure of the bearing. Generally speaking, there are seven common manifestations when the bearing operation is abnormal: the bearing is overheated, the bearing noise is too large, the bearing life is too low, the oscillation is large, the machine function is not met, the bearing is loose on the shaft, and the shaft transformation is difficult.
The typical causes of seven common manifestations: smooth grease, smooth oil expired or wrong selection; smooth grease is too full or oil level is too high; bearing clearance is too small; bearing housing bore is not round, bearing box distortion, support surface Uneven, the inner diameter of the bearing box hole is over. Calling the hoe head 夤 è ¡è™» è ¡è™» 簦桓嵘 簦桓嵘 è¾› è¾› è¾› 霰 霰 霰 霰 ã„–å²¢ ã„–å²¢ ã„–å²¢ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜ æŽè°¥å´¤è›˜å²¢ é‚¢ æ·‡ 蟆 (6) 芰Σ 猓 猓 猓 猓 龌蚨喔鲋岢 岫 岫 岫 岫 茫 茫 茫 茫 ç…½ ç…½ ç…½ ç…½ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾Heart è°Œ 蛘 蛘 蛘 å…€ å…€ è·Žå€ å²¢ å²¢ å²¢ å²¢ å²¢ å®æŽè°™ å®æŽè°™ å®æŽè°™ å®æŽè°™ å®æŽè°™ å–œ å–œ å–œ å–œ å–œ å–œ æš æš å•„è¯–èš§ 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧 啄诖蚧Lack of fat, debris, sand, carbon powder or other contaminants enter the bearing housing, water, acid, paint or other contaminants enter the bearing housing, debris and other debris in the bearing housing of the equipment bearing are not cleaned, shaft diameter Too small, tight sleeve locking is not possible, because the slipping effect (because of rapid start) causes scratches on the roll because of the shoulder dimension Unreasonable causes the shaft to bend, the shoulders collide with the bearing seal cover, the area of ​​the shoulder in the bearing box is too small, causing the outer ring of the bearing to be distorted, the bearing seal cover is distorted; the shaft and the bearing inner sleeve are distorted; the shaft and the bearing sleeve are distorted; Incorrect equipment method; directly hit the bearing with a hammer; the change piece and the stop part of the machine touch; the touch oil seal is severely worn; the smooth oil leaks; the bearing clearance is too large to cause the shaft to oscillate.
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