Looseness monitoring device and system for bolt or nut

Abstract

The invention discloses a looseness monitoring device and system for bolts or nuts, the number of the bolts or the nuts is at least two, the bolts or the nuts are used for being fastened on a base, the bolts or the nuts are provided with non-circular heads. The looseness monitoring device comprises an optical fiber deformation sensor and a supporting device; the optical fiber deformation sensor is provided with a deformation sensing section, the supporting device is arranged on the base and used for supporting the optical fiber deformation sensor, and the deformation sensing section of the optical fiber deformation sensor is arranged to be located at the corresponding position of a non-circular head between two bolts or nuts. The deformation sensing section is arranged on the non-circular head so that the deformation sensing section can deform when any non-circular head of the two bolts or nuts rotates. According to the looseness monitoring device and system for the bolts or the nuts, the looseness and breakage conditions of the adjacent fixed bolts or the nuts can be found in time, and maintenance can be carried out in time; meanwhile, the number of sensors is reduced, and the measurement accuracy is improved.

Description

technical field [0001] The invention relates to the state monitoring technology of adjacent fixing bolts or nuts, in particular to a bolt or nut loosening monitoring device and system. Background technique [0002] At present, the wind power industry has been vigorously promoted all over the world. Since most of the installation locations are on the sea or in remote coastal areas, daily maintenance is extremely inconvenient. Moreover, there are many bolts or nuts for fixing large wind turbines (a large wind turbine has more than 500 bolts). Due to the harsh environment, the bolts or nuts on the wind turbine are prone to loosening, and the bolts or nuts are loose. It will cause damage or even collapse of the wind turbine. During the normal operation of wind turbines, the inspection cycle of high-strength bolts is generally half a year to one year. The inspection cycle interval is long, and the loosening or breaking of bolts cannot be found in time, and each inspection consum...

AI Technical Summary

Problems solved by technology

[0002] At present, the wind power industry has been vigorously promoted all over the world. Since most of the installation locations are at sea or in remote coastal areas, daily maintenance is extremely inconvenient.

Moreover, there are many bolts or nuts for fixing large wind turbines (a large wind turbine has more than 500 bolts). Due to the harsh environment, the bolts or nuts on the wind turbine are prone to loosening, and the bolts or nuts are loose. Will cause wind turbine damage or even collapse

During the normal operation of wind turbines, the inspection cycle of high-strength bolts is generally half a year to one year. The inspection cycle interval is long, and the loosening or breaking of bolts cannot be found in time, and each inspection consumes a lot of time and manpower. , material resources, especially for offshore wind turbines, several kilometers deep into the coastline, the inspection of the unit is inconvenient, and the inspection cost is relatively high.

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