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Looseness monitoring device and system for bolt or nut

A monitoring device and monitoring system technology, applied to measuring devices, using optical devices, measuring torque/torsion force when tightening, etc., can solve the problems of loose bolts or nuts, consuming a lot of time, manpower, material resources, and inconvenience in daily maintenance. , to achieve the effect of increasing the number of sensors, improving scientificity and reliability

Pending Publication Date: 2021-06-22
FEIXUN SENSING TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Looseness monitoring device and system for bolt or nut
  • Looseness monitoring device and system for bolt or nut
  • Looseness monitoring device and system for bolt or nut

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 As shown, the structure schematic diagram of the bolt loosening monitoring device of Embodiment 1 of the present invention, the bolt loosening monitoring device includes an optical fiber deformation sensor 1 and a support device 3, the optical fiber deformation sensor 1 has a deformation sensing section 12, and the number of monitored bolts is many Each is used to fasten on the base. In this embodiment, the monitored bolt is a hexagonal bolt with a hexagonal head. The deformation sensing section 12 of the optical fiber deformation sensor is arranged in the middle of two adjacent hexagonal bolts. , the deformation sensing section 12 of the optical fiber deformation sensor is close to one side of the hexagonal head of the hexagonal bolt at the same time. The sensing section 12 is deformed, and the optical fiber deformation sensor 1 will output a deformation signal to detect the loosening of the bolt.

[0037] In the bolt loosening monitoring device of th...

Embodiment 2

[0057] Such as Figure 5 Shown is a schematic structural diagram of a bolt loosening monitoring device according to Embodiment 2 of the present invention.

[0058] In the bolt loosening monitoring device of the present embodiment, the measured bolt circles around the edge of the circular base 25, and the supporting device 20 is arranged on the same side of the profiling nut 23, and the structure of the supporting device 20 is the same as that of the supporting device 3 in Embodiment 1. have the same structure. The two ends of the optical fiber deformation sensor 21 are respectively fixed on the supporting devices on the adjacent profiling nut 23 and profiling nut 24 , and the optical fiber deformation sensor 21 is arranged around the edge of the base 25 . After the bolt is fixed, the optical fiber deformation sensors 21 on the adjacent two profiling nuts 23 and 24 are restrained by the profiling nuts 23 and 24 at the same time, and any rotation of the profiling nuts 23 and 24...

Embodiment 3

[0061] Example 3 as Figure 6 As shown, it is a structural schematic diagram of a bolt loosening monitoring system according to Embodiment 3 of the present invention.

[0062] The bolt loosening monitoring system of this embodiment includes several bolt loosening monitoring devices 100 of the above-mentioned embodiment 1,

[0063] The loosening monitoring system also includes a signal analyzing device 200 and a laser emitting device 300;

[0064] The signal analyzing device 200 is communicatively connected with the optical fiber deformation sensor in the loosening monitoring device 100;

[0065] The laser emitting device 300 is communicatively connected with the optical fiber deformation sensor in the loosening monitoring device 100;

[0066] The laser emitting device 300 is used for emitting laser light to the optical fiber deformation sensor; the signal analyzing device 200 is used for receiving and analyzing the optical signal returned by the optical fiber deformation sen...

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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 looseness monitoring device comprises an optical fiber deformation sensor; the optical fiber deformation sensor is provided with a deformation sensing section, and the deformation sensing section of the optical fiber deformation sensor is arranged to be located between two bolts or nuts, so that the deformation sensing section deforms when any one 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01B11/26
CPCG01B11/18G01B11/26G01B11/16G01L1/24G01L5/24
Inventor 张建平黄春华
Owner FEIXUN SENSING TECH SHANGHAI CO LTD