Slewing bearing stress distribution monitoring method based on fiber bragg gratings

A fiber grating and slewing bearing technology is applied in the direction of force measurement, measurement force, and measurement device by measuring the change of optical properties of materials when they are stressed, which can solve problems such as inability to accurately judge the safe state, and improve safety and reliability. Reliable, fast and accurate measurements

Pending Publication Date: 2018-05-18
NANJING UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] As one of the special equipment, slewing bearing equipment cannot make timely and accurate judgments on the safety status through routine inspection. In order to ensure the safety of equipment operation and improve economic benefits, it is necessary and urgent to establish a real-time online monitoring system for slewing bearings.

Method used

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  • Slewing bearing stress distribution monitoring method based on fiber bragg gratings
  • Slewing bearing stress distribution monitoring method based on fiber bragg gratings
  • Slewing bearing stress distribution monitoring method based on fiber bragg gratings

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] Such as Figure 1 to Figure 5 , a method for monitoring the stress distribution of a slewing bearing based on an optical fiber grating, characterized in that it comprises the following steps:

[0032] Step (1), uniformly distributed grooves (8) are formed on the end surface of the fixed ring (4) of the slewing bearing. The shape and distribution of the grooves ensure the accuracy of the test without affecting the mechanical structural strength of the slewing bearing;

[0033] Step (2), paste the fiber grating strain sensor (7) in the ring groove (8) of the slewing ring with epoxy resin, and install the fiber grating temperature sensor (6) near each fiber grating strain sensor for temperature compensation, and the optical fiber The grating temperature sensor (6) is close to the fiber grating strain sensor (7), without contacting the fixed ring ...

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Abstract

Provided is a slewing bearing stress distribution monitoring method based on fiber bragg gratings. The method is characterized by comprising the following steps that step (1), evenly distributed grooves (8) are formed in the end surface of a slewing bearing fixing ring (4); step (2), epoxy resins are used for pasting a fiber bragg grating strain sensor (7) on the grooves of the slewing bearing fixing ring (8), and a fiber bragg grating temperature sensor (6) is installed near each fiber grating strain sensor for temperature compensation; step (3), a space division multiplex switch is used forconnecting each branch to a demodulation module for data processing analysis to obtain slewing bearing stress distribution. According to the slewing bearing stress distribution monitoring method basedon the fiber bragg gratings, the fiber bragg grating strain sensor is used for measuring the deformation of the end surface of the slewing bearing fixing ring, the fiber gragg grating temperature sensor performs temperature compensation, the influence of temperature on the fiber bragg grating strain sensor is eliminated, a space division multiplex technology is adopted to connect each branch to the demodulation module for demodulation, data analysis and processing are performed to obtain the slewing bearing stress distribution, and an on-line monitoring function of slewing bearing is achieved.

Description

technical field [0001] The invention relates to a method for monitoring the stress distribution of a slewing bearing based on an optical fiber grating, in particular to a monitoring method for online measurement of the stress distribution of a slewing bearing using an optical fiber grating strain sensor. Background technique [0002] The slewing ring is a key mechanical component developed rapidly in recent decades, which can realize the functions of relative rotation of two structures and load transmission. Compared with ordinary rolling bearings, it can withstand axial load, radial load and overturning moment, and has small structural size, large intermediate space, small turning resistance, flexible rotation, simple and compact structure, and convenient installation and maintenance. Therefore, slewing bearings are widely used in lifting machinery (port cranes, truck cranes, tower cranes), construction machinery (excavators), chemical machinery, medical equipment, military...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24
CPCG01L1/242
Inventor 洪荣晶何培瑜王华张波
Owner NANJING UNIV OF TECH
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