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介绍了东风4型机车牵引电动机轴承及抱轴瓦温度报警的工作原理及使用情况。所述报警器安装方便，测温准确，能提前发现故障，避免机破事故的发生。
The working principle and usage of temperature alarm for traction motor bearing and axle bearing of DF4 locomotive are introduced. The alarm is easy to install, accurate temperature measurement, failure can be found in advance to avoid machine crash accident.