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Fiber bragg grating sensing based hydraulic cylinder dynamic seal failure state monitoring method

A technology of optical fiber grating and failure state, which is applied in the direction of liquid tightness measurement using liquid/vacuum degree, testing fluid tightness by detecting the size change of the measured structural parts, etc., which can solve the problems of the influence of analysis results and achieve information transmission Large capacity, high precision and good sensitivity

Active Publication Date: 2014-07-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the monitoring methods for the failure state of hydraulic cylinder seals can be mainly divided into two categories, among which: the first method is mainly to observe the extension end of the piston rod of the hydraulic cylinder by the operator, and judge whether there is any leakage of the liquid medium. Whether the sealing state is normal; the problem with this type of method is that it is difficult to find out in time through observation in the early stage of seal failure, and when the leakage of liquid medium is found through observation, the seal inside the hydraulic cylinder is already in a serious failure state Therefore, it is impossible to avoid the impact on the operation efficiency of the whole machine equipment due to the failure of the seal, as well as the pollution and harm to the environment
However, the second type of method is usually offline analysis, and requires the accuracy of the collected pressure signal to be very high. If there are interference factors in the collection process, it will have a great impact on the analysis results

Method used

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  • Fiber bragg grating sensing based hydraulic cylinder dynamic seal failure state monitoring method
  • Fiber bragg grating sensing based hydraulic cylinder dynamic seal failure state monitoring method
  • Fiber bragg grating sensing based hydraulic cylinder dynamic seal failure state monitoring method

Examples

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Embodiment 1

[0046] Example 1. Monitoring method for hydraulic cylinder dynamic seal failure status based on fiber grating sensing

[0047] The method for monitoring the failure state of the hydraulic cylinder dynamic seal based on optical fiber grating sensing uses optical fiber sensing technology to monitor the failure state of the hydraulic cylinder dynamic seal in time, specifically: through the hydraulic cylinder piston rod and the piston dynamic seal groove Fiber grating strain sensors are laid on the bottom and sides, and fiber grating temperature sensors are laid inside the piston rod of the hydraulic cylinder to monitor the state changes of the dynamic seal in the hydraulic cylinder in time. The strain and temperature change data of the hydraulic cylinder are collected and analyzed in real time, and the failure state of the hydraulic cylinder dynamic seal is accurately judged by comparing the actual strain value of the working surface of the hydraulic cylinder dynamic seal with the...

Embodiment 2

[0119] Embodiment 2. Preparation of fiber grating strain sensor:

[0120] 1. The structure of the fiber grating strain sensor:

[0121] The fiber grating strain sensor, such as Figure 4 and Figure 5 As shown, it consists of four fiber grating strain sensors 702, 703, 102 and 103, wherein: the fiber grating strain sensor 702 and the fiber grating strain sensor 703 are located on the bottom and side surfaces of the hydraulic cylinder piston dynamic sealing groove to realize the hydraulic cylinder piston dynamic Sealing state monitoring: the fiber grating strain sensor 102 and the fiber grating strain sensor 103 are located on the bottom and side surfaces of the hydraulic cylinder piston rod dynamic seal groove to monitor the state of the hydraulic cylinder piston rod seal.

[0122] 2. Laying of the fiber grating strain sensor:

[0123]The following method is used to lay the fiber grating strain sensor: paste two fiber grating strain sensors 702 and 703 on the bottom and sid...

Embodiment 3

[0125] Embodiment 3. Preparation of fiber grating temperature sensor

[0126] 1. The structure of fiber grating temperature sensor:

[0127] Described fiber grating temperature sensor (also known as fiber grating temperature sensor), such as Figure 6 As shown, it consists of a capillary steel pipe 10, a grating laying section 11 and an optical fiber lead-out part 9, wherein: the grating laying section 11 is in the middle of the capillary steel pipe 10 and is not affected by external force, so its wavelength change is only affected by temperature. Measure the temperature of the hydraulic cylinder during operation.

[0128] 2. Preparation of fiber grating temperature sensor:

[0129] The following method is used to prepare the fiber grating temperature sensor: coat a layer of high temperature resistant adhesive (J133 type epoxy resin) on the surface of the bare grating, that is, the fiber grating temperature sensor 11, and the thickness of the coating should be just enough to...

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Abstract

The invention relates to a fiber bragg grating sensing based hydraulic cylinder dynamic seal failure state monitoring method. According to the method, the dynamic seal failure state of hydraulic cylinders is monitored timely through an optical fiber sensing technology, that is, fiber bragg grating strain transducers are laid at the bottoms and sides of hydraulic cylinder piston rod and piston dynamic seals, and a fiber bragg grating temperature transducer is lain in the hydraulic cylinder piston rod to monitor the dynamic seal state changes in the hydraulic cylinder timely. Strain and temperature change data of the hydraulic cylinder dynamic seal working surface are acquired and analyzed in real time through a hydraulic cylinder dynamic seal failure state monitoring system, and the hydraulic cylinder dynamic seal failure state is determined accurately through the comparison of the actual strain value and the standard value of the dynamic seal working surface of the hydraulic cylinder. The method has the advantages of being capable of achieving point measuring and multi-point distributive monitoring when the dynamic seal state changes are monitored during the working of the hydraulic cylinder, good in sensitiveness, high in accuracy and capable of preventing leakage failures effectively and preventing environmental pollution.

Description

technical field [0001] The invention relates to the field of hydraulic cylinder dynamic seal failure state monitoring, in particular to a hydraulic cylinder dynamic seal state monitoring method based on optical fiber grating sensing. Background technique [0002] The hydraulic cylinder is the actuator in the hydraulic system and has an important influence on the performance of the hydraulic system. The sealing performance of the hydraulic cylinder is guaranteed by the sealing elements in it, and the sealing elements usually work in a medium environment with a certain pressure, especially the dynamic seal. During the reciprocating movement of the piston, due to the dynamic seal and the hydraulic cylinder The friction between the inner walls of the cylinder, as well as the pollutant particles in the oil, etc., are the causes of fatigue, damage, torsion, swelling, extrusion into the gap and other failure forms of the dynamic seal. Among all kinds of failures of hydraulic cylin...

Claims

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Application Information

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IPC IPC(8): G01M3/36G01M3/02
Inventor 赵秀栩温鹏飞张栓栓周传丽
Owner WUHAN UNIV OF TECH
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