Analysis of vibration faults based on air compressors Lu Yibo a, Zhang Huib (Shanxi Luan Coal-based Synthetic Oil Co., Ltd., a. Gasification workshop maintenance b. Quality Inspection Department, Changzhi 046100, Shanxi) proposed optimization of air filters, pipelines And the direction of anti-corrosion operation of the cooler. This paper discusses the air compressor, which is a 4-stage 4-stage centrifugal compressor, model DH63-17, synchronous motor power is 3700kW, the speed is also up to 1480r/min, and the motor and compressor gearbox input shaft is through the coupling. The gears are connected, and then the large gears in the gearbox are used to drive the pinion output shafts on both sides. In general, the speeds of the high and low speed shafts are 12 000r/fn'n and 9800riTn respectively, and the front and rear bearings of the three shafts are respectively. They are all kinds of hybrid bearings, including five-wafer type self-aligning sliding radial bearings and sliding thrust bearings. 1 Vibration fault analysis is a simplified diagram of the unit structure and a schematic diagram of the unit of the measuring point. The air compressor inspection system was designed by the American company ENTEK-IRD. During the monitoring process, we can find that the 3B measuring point is increased from 14m to the same as the vibration of the air compressor 3 and 4 axis measuring points increases gradually. The 4B measuring point is increased from 31m to 38111, which is the vibration trend of the monitoring system. Although the vibration wavelength of the unit is within the alarm value, the fluctuation frequency of the unit vibration is gradually increased, which causes great interference to the safe production of the system. The following is a detailed study and analysis of the factors affecting the vibration of the air compressor. 3B, 4B measuring point vibration trend 1.1 spectrum analysis, such as the 3B, 4B point spectrum trend chart, the figure shows that although the spectral amplitude of 3B, 4B is continuously increasing, but its vibration frequency has been stable at around 200Hz, and At the same time, the power frequency component of this frequency and the working speed is /r=n/60=12000/60=200Hz, and n is the same for the high speed shaft speed. The vibration spectrum is a spectrum for analyzing the causes of vibration. Among them, the rotational stall is a kind of possibility. The vibration is derived from the frequency division frequency of 0.8 and 0.2 times. The other may be caused by the oscillation of the bearing oil film. The vibration frequency of the oil film is usually It is half of the power frequency, so the amplitude is the largest at this time, but as can be seen from the spectrogram, there is no amplitude at this time, so these two may not be the cause of the abnormal operation of the system. However, from the characteristics of vibration and the main vibration frequency in the vibration spectrum, it can be judged that the cause of the failure may be due to rotor imbalance or bearing wear. The above cause of the accident is not accurate, so we can analyze the use of the radial installation of the vibration sensor to obtain a composite axis trajectory, as shown. The image shows that the trajectory of the axis is elliptical, but the ellipse thus formed is larger and more concentrated than the shape of the normal vibration, and it is orderly, that is, the vibration is caused by the rotor imbalance; the second strong evidence That is, the direction of rotation and the direction of rotation of the shaft are such that the vibration is explained from the side because of the unbalanced force on the rotor. At the same time, the axis trajectory is much larger than the normal vibration, that is, the unbalanced force is gradually changing, and the bearing bush is gradually damaged, thereby causing the vibration of the 3rd and 4th grades to increase. 3B, 4B measuring point axis trajectory From the above analysis we can know the following two points: (1) high-speed rotor impeller rotation instability may be caused by the scouring of the medium and the impeller ash; 0 high-speed bearing bush will be damaged, The bearing bushing will also increase. 2 Treatment 2.1 Optimizing the air filter Optimizing the air filter means changing the original spray filter bag filter into a frame type filter, which increases the filtering equipment. It includes two-stage filter vessels, namely plate filter cotton and high efficiency. Filter, so its filtering accuracy has been improved a lot. Optimizing the filter not only improves its filtration but also facilitates maintenance. The improvement of air quality is conducive to the normal operation of the compressor, because the reduction of the amount of dust in the air is beneficial to the operation of the impeller and prolongs the working cycle of the air compressor. 2.2 Anti-corrosion operation of pipes and coolers In order to reduce the damage of oxides to the impeller, we must promptly remove the corrosion of the inlet and outlet pipes, the interstage pipes and the inside and outside of the coolers, or the stainless steel treatment of the code of these equipments to enhance the resistance of the impeller. Corrosion and impact resistance. During the overhaul process, the condensing port of the heat exchanger at the interstage level is enlarged, and the material of the condensing line is changed to a stainless steel line, which can ensure the normal use of the interstage heat exchanger and does not cause liquid slamming due to blockage of the condensing line. Therefore, the above improvement measures can completely change the scouring phenomenon of the impeller. 3 Conclusions Careful analysis of the causes of the vibration of the DH63 air compressor and the measures to solve the vibration, we can find that the 3rd and 4th vibration and several sets of vibration have been improved. The current unit is relatively stable, and the vibration problem has been effectively solved, so it is of great help to the economic benefits of the enterprise.
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