Online automatic-detection sliding bearing fault early-warning system and expansion amount measurement method

Abstract

The invention relates to an online automatic-detection sliding bearing fault early-warning system and an expansion amount measurement method. The system comprises a data collecting module, a data filtering and processing module, an analog-to-digital conversion processing module, a CPU, a limit value calculating and processing module and an early-warning and alarming output module, wherein the data collecting module, the data filtering and processing module, the analog-to-digital conversion processing module, the CPU, the limit value calculating and processing module and the early-warning and alarming output module are connected in sequence, the data collecting module is used for collecting the gap values between a valve shaft and a bearing bush, the limit value calculating and processing module is used for calculating the limit value of the expansion amount, the early-warning and alarming output module is used for performing early-warming or alarming according to the calculation result of the limit value calculating and processing module, and the data collecting module penetrates through the bearing bush to make contact with the valve shaft. The measurement method includes the following steps that the gap values d3 and d33 are detected, calculation is performed, and alarming is output. According to the online automatic-detection sliding bearing fault early-warning system and the expansion amount measurement method, the data collecting module is adopted for detecting the dynamic side domain of a sliding bearing at normal temperature and determining the dynamic side domain as a constant value domain, then, a high-temperature time domain value is measured, comparison is performed, and therefore fault early-warning and fault alarming are output, the control resolution is 0.0013 mm, and the linearity is + / -1.5%.

Description

technical field [0001] The invention relates to early warning information for automatic fault detection, in particular to an on-line automatic detection sliding bearing fault early warning system and a method for measuring the expansion amount of a nuclear power safety valve group valve sliding bearing expansion amount. Background technique [0002] There are more than 500 nuclear power plants in the world today, with a total capacity of 400 million KW, accounting for 16.1% of the total power generation; China has also built many nuclear power plants in the past 20 years, but the nuclear power generation only accounts for 1.2% of the total power generation. In order to accelerate the development of nuclear power, the state proposes to build nuclear power plants before 2020, increasing the proportion of nuclear power to 4%. [0003] The intelligent reheat double-valve group for steam turbines in nuclear power plants is a non-nuclear valve installed on the pipeline between the...

AI Technical Summary

Problems solved by technology

Several large steam turbine factories in China already have the ability to design and manufacture ordinary nuclear-grade valves, but the key valves with high requirements, such as the reheat double valve group for nuclear power plant steam turbines, have strict technical requirements, high safety factor, and are subject to the protection of intellectual property rights of foreign products. The domestic independent development of this technology has not been able to achieve breakthrough progress, resulting in the current nuclear power reheating double valve group and other nuclear valve products basically rely on imports, expensive and high maintenance costs, the key valve accessories for the safe operation of nuclear power Still subject to foreign suppliers

Images