In order to improve the stability, accuracy and timeliness of the current axle temperature alarm device of railway locomotives and expand its functions, the control part of the existing axle temperature alarm device of railway locomotives has been improved by PLC, the axle alarm device has been added with a first-level pre-alarm function, and the locomotive roof high-voltage alarm has been studied. A multifunctional monitoring and alarm device that can realize both the locomotive axle temperature alarm and the roof high-voltage alarm has been designed to reduce the occurrence of false alarms of the locomotive axle alarm device, eliminate axle temperature failures in the bud, and better protect the operation safety of the locomotive and the personal safety of maintenance personnel. Keywords: axle temperature monitoring, high-voltage detection, pre-alarm, anti-interference device
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