On-site analog signals, such as expander intake pressure, compression end oil film pressure, etc., these signals are collected into S7-215 by EM231 module; BENTLY3500 monitors expander speed, bearing temperature and rotor axial displacement, radial vibration in real time. After calculating the amount and the corresponding alarm and parking set value, the relay module outputs an alarm and a stop signal, wherein the driving interlock signal is used to prevent illegal driving when the fault is not eliminated. Shortly after the operation of the excavator, it was found that the large pump casing was hot. After decomposition, it was found that the side panels were severely worn and the pump was no longer usable. After the new pump is replaced, the boom movement speed returns to normal. Therefore, for the fault phenomenon that can be compared, it can be compared with the human hand and considered as a whole; to judge the fault of such hydraulic system, it should have certain hydraulic technical knowledge.
The operation strategy module processes the collected data in real time, including: speed-up processing, alarm and interlock processing, and adjusts the parameters of the lower-level instrument according to the processing result, and sends the data together with the real-time data; the data analysis module can be expanded The fault diagnosis and prediction of the compressor unit provides effective means, including time domain analysis and trend analysis. The time domain analysis analyzes the maximum and minimum values, variance, mean and rate of change of signals such as time domain signal vibration, temperature and pressure. Fault diagnosis provides reference; trend analysis provides daily, weekly, and monthly trend analysis of process and unit historical data to provide reference for system fault prediction; Web service module provides webpage publishing function for the system, and authorized users to provide viewing process and unit parameters. The data access interface allows the user to view real-time operational data, historical data, alarm records and system control parameters in the database through a web browser, to achieve remote data monitoring, and to provide an effective means for remote management and expert consultation.
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