On-line diagnostic device and diagnostic method for jack shaft system of large-scale rotating machinery

Abstract

The invention discloses an online diagnosis device and method for a large-scale rotating machinery equipment peaking-shaft system. The device comprises a supervision instrument TSI system installed a large-scale rotating machinery equipment site, the supervision instrument TSI system is provided with a plurality of paired eddy-current sensors, and each paired eddy-current sensor transmits vibration information of the main shaft of large-scale rotating machinery equipment to the supervision instrument TSI system; the supervision instrument TSI system transmits the vibration information to an acquisition device, and the acquisition device calculates to acquire the accurate position of the main shaft through the vibration information and transmits the accurate position of the main shaft to a DEH control system; meanwhile, the DEH control system receives signals from a peaking-shaft oil pump starter relay; the DEH control system performs difference calculation between the accurate positions of two times on the signals received from the peaking-shaft oil pump starter relay to acquire height of the main shaft being raised, and online diagnosis is realized. The online diagnosis device and method has the advantages that safety running of the equipment is improved, and working load and working intensity of operators and maintenance personnel are reduced.

Description

technical field [0001] The invention relates to an on-line diagnostic device and a diagnostic method for a jacking shaft system of a large rotating mechanical equipment. Background technique [0002] After each stop of the steam turbine, when starting up again, the jacking device must be opened first, its function is to send high-pressure oil to the lower part of the bearing pad, lift the rotor, and force the formation of a static oil film to reduce the friction between the shaft diameter and the bearing pad. Reduce the starting torque of the crank gear. [0003] The unit needs to open the top shaft oil pump to lift the main shaft before each start. At the same time, it is also necessary to use one or several mechanical dial indicators to do the "big shaft jacking test" before starting after each overhaul of the unit. "s reason. [0004] In fact, since there is no mechanical dial indicator on site during normal operation, operators can only judge whether the jacking device...

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Problems solved by technology

[0004] In fact, since there is no mechanical dial indicator on site during normal operation, operators can only judge whether the jacking device is working normally by observing the outlet pressure of the jacking oil pump. Does the oil pump really lift the big shaft, what is the lifting height of the big shaft, whether the tiny oil inlet hole of the bearing bush is blocked, whether there is oil leakage, etc.

[0005] Therefore, if for some reason, the lifting height of the large shaft is not enough, put it into the barring, which will cause the bearing bush to be squeezed and worn, and the temperature of the bearing bush will rise. This situation has happened many times in many power plants.

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