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尖山铁矿主要采矿设备WK-4B型电动挖掘机．再提升、推jMH、回转和行走四个栩．构均为直流电机驱动．其运行状况直接关系着电铲的作业率，正确的维护修理是应该引起我们注意的问题c1换向器的维护正常的换向器应保持光洁的圆柱形表面，不应有擦伤及灼痕。当换向器在负载下长期运
Jianshan Iron Mine main mining equipment WK-4B-type electric excavator. Then upgrade, push jMH, slewing and walking four Xu. Structure are DC motor drive. Its operating status is directly related to the power shovel operation rate, the correct maintenance and repair should be our concern c1 commutator maintenance Commutator should maintain a clean and smooth cylindrical surface, there should be no scratches and burns . When the commutator long-term load under load