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Detection method of locked rail temperature for long rails of seamless track

A technology of seamless lines and locked rail temperature, applied in thermometers, measuring heat, measuring devices, etc., can solve the problems of lack of stress, damage, etc.

Active Publication Date: 2018-08-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it can only detect the concentration area, distribution and concentration degree of component stress, and lacks the judgment of stress magnitude and damage degree
The disadvantage is: using active AC magnetization, the sensor needs to be attached to the surface of the component, and there are certain requirements for the roughness of the component surface

Method used

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  • Detection method of locked rail temperature for long rails of seamless track
  • Detection method of locked rail temperature for long rails of seamless track
  • Detection method of locked rail temperature for long rails of seamless track

Examples

Experimental program
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Effect test

Embodiment

[0032] Using a self-made system to detect the temperature stress of a 1100m downlink seamless line in service in a section of a railway bureau in China. Among them, the stretching area at both ends of the line is 100m, and the fixed area in the middle is 900m. The rail specification of this line is U74 type 60Kg / m rail, and its cross-sectional area A=77.45cm 2 , the moment of inertia is I=3217cm 4 , elastic modulus E=2.06×10 5 MPa, coefficient of thermal expansion α=1.18×10 5 m / °C, the sleeper configuration is 1840 pieces / Km type II concrete sleeper, the sleeper spacing is 0.568m, the length is 2.6m, the cross-sectional width of the sleeper is 0.25m, the height is 0.2m, and the elastic modulus of the sleeper is E tie =1.5×10 4 MPa, the initial track bed lateral resistance is 12.1N / mm. The inspection was carried out at noon for two consecutive days, and a total of two inspections were performed. The on-site rail temperatures were 36°C and 42°C respectively, and the tempera...

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Abstract

The invention discloses a method for detecting the fastening-down temperature of a long seamless rail. The method is characterized by utilizing a metal magnetic memory(MMM)-magnetic Barkhausen noise(MBN) fused online detection method, and comprises steps of: establishing a system platform; rapidly detecting the long rail by using a MMM method, recording a temperature stress distribution map of the rail, and locating a temperature stress concentration area; quantitatively detecting the temperature stress of the temperature stress concentration area point by point by using a MBN method to determine a stress change; and determining the fastening-down temperature of the seamless rail according to the designed load capacity of the seamless rail. The method may quickly and quantitatively detect the internal temperature stress of the long seamless rail, establishes a computational formula for the actual fastening-down temperature of the seamless rail according to rail parameters and field rail temperature, and achieves online, lossless, and quick detection of the actual fastening-down temperature of the seamless rail.

Description

technical field [0001] The invention belongs to the field of detection and evaluation of track stability of a high-speed railway seamless line, and relates to a detection technology and method for online detection of seamless line rail temperature stress. And the detection scheme and method of "actually" locking the rail temperature of the long steel rail of the seamless line. Background technique [0002] When designing a seamless line, the appropriate locked rail temperature should be selected according to the climate and environmental changes in each region, which is called the "design" locked rail temperature, and the locked rail temperature when the line is laid is called the "construction" locked rail temperature. After the line is laid on the line, affected by the ambient temperature and humidity; the influence of the lateral resistance of the ballast bed and the original plastic bending; the influence of the longitudinal thermal expansion and contraction temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/36G01L1/12
CPCG01K7/36G01L1/12
Inventor 陈娟祁欣
Owner BEIJING UNIV OF CHEM TECH
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