Take the “body temperature” of the rails-Lock rail temperature
I saw that the maintenance personnel opened an orange box, took out a laptop and a set of precision testing instruments, and stuck the electromagnet probe on the side of the rail. After about 20 minutes of measurement, the laptop screen showed a problem that could not be measured in the past. Parameters: Lock rail temperature.
Lock rail temperature
What is the locked rail temperature?
Due to thermal expansion and contraction, the steel rail will generate thermal stress when the temperature changes, and this stress is also one of the reasons for rail breakage and rail expansion. Therefore, when laying the rail, it is necessary to fasten the connecting parts within a certain rail temperature and lock the rail firmly to ensure that the temperature stress of the rail is zero. This temperature is the “locked rail temperature”, also known as “zero stress rail temperature”.
Why measure rail temperature? Before there is no precision detector, the locked rail temperature refers to the temperature when the rail is laid, but with the passage of time and the change of the temperature environment, the actual locked rail temperature of the rail will gradually deviate from the designed locked rail temperature. Finding out the regularity of the temperature change of the locked rail may bring about the threat of rail breakage in winter and rail expansion in summer.
What are the benefits of a rail “thermometer”? In this year’s autumn inspection of equipment, the Changchun high-speed rail infrastructure section adopts the rail “thermometer” seamless line locking rail temperature detector (NTS), according to the seasonal temperature changes, timely grasp the locked rail temperature situation, regardless of its small size, but in the measurement data The variables such as displacement and tension are all calculated in real-time, and the results can be obtained in a few minutes. In order to ensure the accuracy of the data, the operator has to repeat the measurement 5 times, and finally obtain the most accurate average.
“In the past, when I was working on-site, I checked the previous records to lock the track temperature, so I had no idea about the actual locked track temperature. With this advanced equipment, I would feel more at ease when working on it.” Changchun High-speed Railway Comprehensive Maintenance Workshop Line Worker Yang Xu said
