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Analysis and Disposal of Bearing Faults in Cement Machinery (1)
Source: Bearing network time: 2018-03-20
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1 Rolling bearing fault analysis 1. 1 rolling bearing oscillation analysis of the rolling bearing problem is typical of its rolling touch touch simple fatigue off. {TodayHot} this shedding, shedding outside the outer surface is about 2mm2; depth is 0. 2mm ~ 0. 3mm can be discriminated by the monitor to detect its oscillation. The shedding may occur on the outer race, the outer race or the roll on the inner race. In the meantime, the inner race has higher contact stress;
It is used in all kinds of diagnostic skills for rolling bearings; the monitoring method of oscillation monitor is still the most important one. Overall, the time domain analysis method is simpler; it is suitable for occasions with low noise disturbance; it is a good way to make a simple diagnosis. In the frequency domain diagnosis method; the resonance demodulation method is the most sophisticated and reliable; suitable for the fine diagnosis of bearing faults, the time-frequency analysis method is similar to the resonance demodulation method; the time and frequency characteristics of the fault signal can be correctly scribed; .
1.2. Analysis of the damage method of the rolling bearing and the compensation method (1) Overload. Severe appearance shedding and wear; indicating the failure of the early fatigue caused by the overload of the rolling bearing (in addition, too tight cooperation will also constitute a certain degree of fatigue) Overloading can also lead to severe bearing ball rolling wear, large area shedding and sometimes accompanied by overheating. The solution is to reduce the bearing load or improve the bearing capacity of the bearing.
(2) Overheating. Roller raceway, steel ball or holder change color; indicate bearing overheating. The increase of temperature will reduce the effect of smoothing agent; make oily oil difficult to form or completely disappear. Temperature is too high; The data of the road and the steel ball are annealed; the hardness is reduced. This is mainly due to the cooling of the helium or heavy load, and the cooling is not sufficient under high-speed conditions. The solution is sufficient heat dissipation; additional cooling.
(3) Low-load erosion. Elliptical wear marks appear in the axial direction of each steel ball; this indicates that when the bearing is not working and no smooth oil film occurs, the external oscillation or low-load vibration constitutes failure. The solution is to isolate the bearing or participate in anti-wear additives in the smooth grease of the bearing.
(4) Installation problems. The first focus is on the following aspects:
Top of the list; focus on the device force. For example, the pressure pit on the raceway; the load has exceeded the elastic limit of the data. This is because the static overload may be caused by severe impact (such as hitting the bearing with a hammer when the device is installed). The correct device method is to apply force only to the ring to be pressed (do not push the outer ring when installing the inner ring on the shaft).
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