Real-time stress monitoring system and safety coefficient detection method for coupling bolt

Abstract

The invention relates to the field of stress monitoring of coupling bolts, and discloses a real-time stress monitoring system and a safety coefficient detection method for a coupling bolt. The monitoring system mainly comprises a stress sensing unit arranged on a coupling bolt body, and a signal sampling unit, a power supply device and a data processing unit which are arranged on the inner side orthe outer side of a water turbine protective cover. Based on the monitoring system, a logic control program is written into the data processing unit through the upper computer, so that the data processing unit has the capacity of calculating, judging and analyzing received signals, and then the data processing unit is accessed through the upper computer. According to the technical scheme, the axial stress of the bolt on the rotating part of the water turbine generator set and the axial hydraulic thrust of the water turbine can be monitored in real time. Meanwhile, the reliability of a rotating connection system and the fatigue life of the connection bolt can be evaluated regularly, and quantitative and qualitative scientific bases are provided for safe operation, scientific maintenance and fault diagnosis of a power station.

Description

technical field [0001] The invention relates to the field of stress monitoring of coupling bolts, in particular to a real-time stress monitoring system and safety factor detection method of coupling bolts. Background technique [0002] Fasteners such as bolts and studs have been widely used in railways, bridges, hydropower, wind power, nuclear power, transportation, aerospace and other fields. Due to their complex and diverse working environments, they usually need to withstand large impact loads, temperature changes and Corrosion and other unfavorable factors, these unfavorable factors are likely to cause joint failure problems such as bolt looseness or fracture, therefore, early detection of defects in fixing parts and real-time working stress of bolts are of great significance to ensure the safe operation of equipment and improve equipment life. . [0003] The effectiveness of fastener joints is very important, and the stress state of their work can reflect whether they ...

AI Technical Summary

Problems solved by technology

The aforementioned technical scheme can achieve the relationship between residual stress and hardness by changing the residual stress loading at a certain temperature; it can also achieve a certain residual stress loading and obtain the relationship between residual stress and hardness by changing the temperature; but its implementation is If conditions permit, the temperature needs to be controlled and cannot be monitored in real time

However, the working status of the coupling bolts and other fasteners of the hydro-generator set is crucial to the safe and stable operation of the entire unit. Reduced connection reliability, fatigue damage of fasteners and reduced shafting stability, and even induce abnormal vibration of the unit, affect the normal economical, safe and stable operation of the unit, and reduce the life of the equipment. Therefore, the coupling bolts of the hydro-generator set It is necessary to implement online monitoring and real-time safety assessment of fasteners

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