The state monitoring and diagnostic technology version closely monitors the vibration state of the air compressor. After coordination, the air separation production was stopped. On July 5, the air compressor was dismantled and repaired, and the third-stage impeller was inspected. It was found that the impeller adhered with rusted iron pieces, which caused the three-stage vibration to suddenly stop interlocking. The instrument control circuit is checked and the feedback signal is normal. The vibration online monitoring trend graph was obtained, and it was found that the third-stage vibration displacement value of the air compressor did not fall after the increase, and the unbalanced fault in the preset fault characteristic trend graph increased at the same time, indicating that the vibration mutation was real. See other failure feature trends without significant changes (). Before the increase of the third-order vibration, the difference between the unbalanced vibration velocity values ​​and the increase is 3.36 mm/s (3). The failure trend map and spectrum diagram of the first-, second-, and fourth-stage rotors, gears, and bearings were not found to be significantly increased. Therefore, it can be confirmed that the three-stage impeller imbalance fault is analyzed. If the rotor cleaning is uneven due to uneven cleaning of the impeller scale on-line cleaning, the vibration value will not suddenly increase. The reason for this high vibration is likely to be caused by the inhalation of foreign objects in the pipe to the impeller that rotates at high speed. Yin Gang (Laiwu Tianyuan Gas Co., Ltd., Laiwu 271126, Shandong, China) In order to ensure the safety of high-speed centrifugal air compressor operation, an on-line vibration monitoring system was installed to find out the cause of the failure and reduce production losses. The DCS of the air compressor of the Laiwu Tianyuan Gas Company in the urban area showed a three-stage vibration mutation of the air compressor. The amplitude was increased from 11 (Xm suddenly increased to 30 pm, the first and second vibrations did not change, and the fourth-order vibration appeared at the same time about 1 (Xm fluctuations but then It returned to normal. The third-order vibration increased and continued to fall back to 28 pm after about 4 hours, and then remained at 28m. Displacement/1曰 technical version of the state monitoring and diagnostic technology frequency / kHz vibration increased after the increase in spectrum, in line with the vibration monitoring diagnosis results. Upon further inspection, the corroded iron piece is derived from the guide vane dropped by the tertiary inlet pipe. After the maintenance, the three-stage vibration of the air compressor dropped significantly. The online spectrum diagram showed that the three-stage vibration speed dropped back to 1.1lmm/S, and the operation remained stable. The status monitoring diagnosis results are consistent with the on-site inspection results. It avoids the production loss caused by immediate shutdown, and once again verifies the importance and monitoring advantages of online condition monitoring of equipment. Condition monitoring technology in the equipment installation stage J Wang Ping (Shanghai General Motors Corporation, Shanghai 201206) Dongyue Painting Department 2 is the new workshop of Shanghai General Motors Co., Ltd. The equipment of this workshop adopts the advanced coating equipment of German DURR company. In addition to robotic spray equipment, there are many baking equipment and various pumps. DURR has installed SPM-specific test screws for all motor bearings. This method has high detection accuracy and is useful for trend analysis of vibration. The following is an example of equipment troubleshooting during the installation and commissioning phase of the equipment. Dongyue 2 Electrophoresis Drying Room has 1 circulating fan (314231 W313V1), its motor power is 45kW, and the motor is directly connected to the fan. When the fan is installed, the 2V end vibration value of the motor is 10.3mm/s, and the 2A vibration value is 3.3mm/s. The position of the fan vibration measuring point is as shown. Among them, the 2V end of the fan has a higher amplitude, the harmonic energy is concentrated on the fundamental frequency (), and the horizontal and axial amplitudes are small. Due to the small amplitude in the 2A direction, even unbalance and shaft bending faults can be eliminated. The possible reason is that the fan saves the balance adjustment of the blades. The adjusted 2V end vibration spectrum is in static imbalance. Because it is a direct-connected fan, it indicates that there is an imbalance in the blades, and the figure is a vibration trend diagram before and after adjustment. Fan vibration measuring point layout Fiber Laser Cutting Machine,Cnc Plasma Laser Cutting Machine,Laser Cutting Machine Sheet Metal,Fiber Laser Metal Cutting Machine Zhongcan Technology Co.,Ltd , https://www.zhongcanlaser.com