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介绍了P＆H公司挖掘机自动润滑定时器的工作原理及存在的问题，本人提出用可编程控制器实现自动润滑定时，并增加故障报警及30s停机等功能。
The working principle and existing problems of P & H excavator automatic lubrication timer are introduced. I propose to use programmable controller to realize automatic lubrication timing, and increase the functions of fault alarm and 30s shutdown.