VBT35 + detection and diagnosis of bearing fault well

VBT35 + detection and diagnosis of bearing faults well - 2019 07 - Source: poldi beauty science and technology ( Beijing) Co. , LTD VBT35 + machine status inspection instrument developed by poldi beauty innovation, is widely used in field and popular VBT35 upgrade on the basis of the model, the measurement dynamic range, the precision of frequency and speed are improved, the industrial field more effectively machine pump equipment state and fault monitoring and diagnosis. VBT35 + follow 'fool' design principles, retain full coverage and sensitivity of fault in operation, the interpretation of the data, it gets' ease 'build predictive maintenance system. A petrochemical company maintenance department adopted three VBT35 + regular inspection and pump equipment of the machine condition monitoring. Here are two successful discovery, diagnosis and treatment equipment abnormal case. （ A) Atmospheric and vacuum area of single centrifugal pump, the motor speed 2980 RPM. Measurement in December 2018, found that the motor drive end bearing spectrum anomaly. Turn the frequency of the motor for 49. 7 hz, envelope demodulation spectrum significantly in 153. 8 hz frequency and harmonic frequency, according to the bearing model, we determine the frequency of bearing outer ring fault cause. The vibration velocity spectrum, total 1. 67 mm/s, according to the ISO10816 - 3 standard evaluation is not high. Envelope demodulation spectrum showed obvious bearing outer ring failure frequency and its harmonic frequency, prior to the highest energy to 0 in demodulation. 78 g, triggering warning alarm. Found that after dismantling the bearing outer ring has obvious flaws, see below. Conclusion: through VBT35 + detection, find out the bearing failure in advance, supplement the maintenance plan, so as to ensure the production cycle. （ 2) P - hydrogenation area 4103 single centrifugal pump, the motor speed 2970 RPM. On July 13, 2018, found that the motor drive end bearing state Bg, acceleration of the Acc and envelope Env value rise significantly, the speed of the motor for 49. 9 hz, envelope demodulation spectrum significantly in 154. 5 hz frequency and its harmonic frequency tracking after a period of time, during the overhaul of its scheduled for December for maintenance. Trend chart reflects the state of bearing the high frequency vibration and envelope parameters values rising. Only 1 speed spectrum, the RMS. 68 mm/s, but the frequency of 154 hz bearing fault clearly visible. Acceleration spectrum to inherent frequency are bearing failure frequency modulation characteristics, namely the natural frequency of 2779 hz on both sides have equally spaced 154. 9 hz sideband. Acceleration is also high, worth a total of 5. 77 g, trigger dangerous alarm. 154 hz is more obvious in demodulation spectrum, total 1. 96 g, trigger dangerous alarm. After repair, found that the bearing inner ring there is fault, see below. Conclusion: using VBT35 + machine status checking instrument, several measurements to track of fault severity, ensure the equipment operation, to avoid the unplanned downtime. Case: Gu Guangbin XinXiaoCheng ( Shandong)