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ＢＭ（ＫＪ）系列矿井提升机电控部分的技术改造肥城矿务局郑洪春ＥＭ（ＫＪ）型系列矿井提升机采用ＫＫＸ电控系统，是五十年代伴随该系列提升机由原苏联引进的，主要存在如下的缺点：（ｌ）这种以电流为主、时间为辅的继电器一接触器控制系统看重考虑交流电机的启动控制...
Technical Transformation of Electronically Controlled Part of BM (KJ) Series Mine Hoist Zheng Hongchun EM (KJ) series mine shaft hoister adopts KKX electronic control system and was introduced in the 1950s by the former Soviet Union with the series of hoists. There are the following shortcomings: (l) This current-based, time-supplemented relay-contactor control system takes into account the start-up control of the AC motor.