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Suo Xuzhou Abstract This paper introduces the timely and successful diagnosis of the air compressor failure of the Pangang Oxygen Plant by using predictive maintenance technology, avoiding serious damage accidents of the unit and achieving good economic benefits.
Off-the-key word air compressor condition monitoring fault diagnosis and analysis year, month, Pangang Steel Oxygen Plant air compressor online monitoring system alarm, showing the vibration value is b, above the normal value.
The online monitoring system can only alarm the vibration value, but can not distinguish the cause of the fault. Therefore, the Beijing Zhentong and Entek vibration analyzers are used for fault analysis and diagnosis.
The air compressor structure and the measuring point working circle air compressor directly drive the large gear by the DC motor, and the two pinion gears meshing with the same drive the impeller shaft I and the shaft n respectively, the air is sucked by the impeller, and the impeller is impeller After being compressed, it is sent to the impeller and finally enters the air separation system.
The second process parameter motor speed fire diagram equipment diagram and measuring point arrangement one honest board melon 耘 二 二 图 一 一 一 一 一 一 一 一 一 一 一 一 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本The vibration characteristics and diagnostic methods are studied. The obtained results have guiding significance for on-site monitoring and diagnosis of reciprocating water injection pumps, and have practical value in engineering.
The individual characteristics of the reciprocating machine are outstanding.
Therefore, for the monitoring object, the simulation test of common operational failures, researching its vibration characteristics and diagnostic methods is an effective way to carry out reciprocating mechanical vibration monitoring and diagnosis.
In view of this, the fault simulation test method and analytical research method introduced in this paper will have certain reference value.
References Huang Wenhu et al.
Principle and application of equipment fault diagnosis technology.
Beijing.
Science Press.
Chen Rongzhen and so on.
Simulation test and diagnostic study of the power end of the injection pump.
Petroleum machinery.
Year, Volume Supplement Author Unit Petroleum Exploration and Development Research Institute Machinery Institute Communication Address Beijing College Mail Box Postal Phone China Equipment Management Motor Power Large Gears Number of Impellers Axis Upper Gears Number of Speeds Impeller Shafts Gears Number of Rotating Speeds Three Speeds of Each Axis The meshing frequency of each gear pair is large. The frequency of the gear is turned off. The frequency of the large-axis is turned off. The frequency of the large gear and the two small gears. Therefore, there may be three kinds of spectral lines on the spectrogram. Great off.
The meshing frequency modulation sideband is shown in the table.
Bu Xiang.
Still leading a monk.
The price is still, the Japanese Jiao 61 inch 10 weaver milk, the state, Bu Ruijiao called the side frequency mesh frequency on the side frequency of a city big brother, a glimpse.
Qiqi diagram, found that there is obvious modulation phenomenon, the meshing frequency is modulated by the low frequency component, according to the appearance of the sideband on the spectrogram, but because the meshing frequency value is large, coupled with the computer display accuracy is low, the sideband is annihilated.
However, by calculation, the found and should be the lower frequency band and the upper frequency band of the meshing frequency, respectively, and the bandwidth is approximately the axis n frequency shift.
Because the frequency of the axis n is low, it is difficult to determine whether there is a fault. Therefore, the data of the measuring point is collected by the Entek vibration analyzer, and its spectrum is shown.
From this, it can be seen that the frequency conversion and its harmonic components of the frequency-transmission axis n of the large-frequency gears of the large-frequency gear axis 1 are additionally found, and some frequency components are approximately half of the axis n-frequency.
According to the vibration theory, the loosening of the bearing bush, the oil film whirl, etc. will produce low-order harmonic components of the frequency shift. The oil film whirl is related to the seismic temperature of the bearing of the working speed and the bearing of the pressure bearing, but the operation is relatively stable. The oil temperature is also normal, so the oil film whirls and the possibility of rubbing the tile is not large, so the possibility of loosening the bearing bush is large.
6 Bu Bu has four failure analysis and diagnosis diagram is to use the spectrum diagram and time domain waveform diagram collected at the measurement point. There is an obvious spectrum line from the spectrum diagram, and the corresponding frequency value is the acceleration amplitude. It is obvious that it contains important fault information.
From the surface, it is the meshing frequency of the gear. According to the past experience value, the amplitude of the meshing frequency is generally a multiple of the normal value. It can be seen that the gear meshing condition is poor, which is related to the machining accuracy and installation of the tooth profile, but it cannot be determined.
Look at the time domain wave 1 Pazhou map point spectrum map map point spectrum map protection five conclusions The above analysis shows that the important cause of the meshing frequency value is that the looseness of the shaft 1 watts causes the shaft n to run unevenly, resulting in When the gear on the shaft n meshes with the large gear, there is a deviation, which causes the meshing to be inaccurate.
Due to the large value of the meshing frequency, the tooth surface may also be damaged and should be repaired early.
During the overhaul, it was found that the Wabba alloy was loose, and the tooth surface pitting was more serious, which was consistent with the diagnosis.
After the overhaul, the frequency values ​​are small, and the maximum vibration value is normal.
References compiled by Shen Qinggen.
Chemical machine fault diagnosis technology.
Editor-in-Chief of Zhang Anhua, Zhejiang University Press.
Electromechanical equipment condition monitoring and fault diagnosis technology.
Northwestern Polytechnical University Press Author Unit Panzhihua Iron and Steel Group Corporation Equipment Diagnostics Center Communication Address Panzhihua City, Sichuan Province, Zip Phone Map Measurement Point Time Domain Waveforms China Equipment Management
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