Fiber grating railway switch close contact monitoring device

Abstract

The invention discloses a fiber grating railway switch close contact monitoring device, which consists of a fiber grating close contact sensor, a fixed clamp assembly and a rigid baffle plate. The fiber grating close contact sensor comprises a fiber grating pair, an elastic rod, an adjustable ejector rod, a sensor protecting box and a fiber protecting hose; fiber gratings are jointed to the surfaces of two sides of the elastic rod, and the adjustable ejector rod is arranged on the elastic rod; and the fixed clamp assembly comprises a fixed clamp, fastening bolts, a sensor protecting box fixing plate and fixing bolts. The fiber grating close contact sensor is fixed at the inner side of a basic rail of a switch by the fixed clamp assembly, and the rigid baffle plate is fixed at the end of apoint rail. When the point rail moves and is in close contact with the basic rail, the rigid baffle plate is gradually contacted with the adjustable ejector rod, the elastic rod is deformed, the central wavelengths of the two fiber gratings jointed to the surfaces of the two sides of the elastic rod offset in opposite directions, and the close contact state of the point rail is represented by using the absolute value of the offset. The device has the advantages of long close contact monitoring distance, small volume, easiness in installation, interference resistance and convenience for maintenance.

Description

technical field [0001] The invention relates to the technical field of railway turnout safety monitoring and the technical field of optical fiber grating sensing. Specifically, it is a fiber grating railway turnout close-adhesion monitoring device. Background technique [0002] As the main force of my country's transportation industry, railway transportation plays a very important role in the development of national economy. In railway transportation, ensuring safety is always the first priority, so it is of great significance to develop new technologies to improve the detection level of railway equipment. [0003] As a conversion device for railway line changes and line intersection and separation, turnouts are an indispensable part of railway line operation. Turnouts have a high utilization rate in track structures, but they are relatively weak. They are also the most complicated technical indicators for public works lines and have the highest requirements for line condit...

AI Technical Summary

Problems solved by technology

At present, most of the state monitoring devices for close-fitting of turnouts used in China have complex structures, use a large number of electronic circuits, and mostly use switching values ​​for monitoring, and cannot give the distance value of the close-fitting process.

This is because the zero point drift of the

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