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1 问题的提出 铁路机车在起动、制动及雨雪天气作业时,为保证生产作业安全,需增大轮对踏面与钢轨之间的粘着力,因此要向钢轨表面撒干砂,防止车轮打滑,确保机车运行安全。在调车作业中由于起动停车频繁,撒砂次数更多,所以砂的干燥程度直接影响撒砂效果。采购的天然砂子必须
1 Problems Raised railway locomotive in the start, braking and rain and snow weather operations, in order to ensure the safety of production operations, to increase the wheel tread and rail adhesion between, so to the surface of the rail to sprinkle dry sand and prevent wheel slip , To ensure the safe operation of the locomotive. In shunting operations due to frequent starts and stops, sanding more times, so the degree of dry sand directly affects the sand effect. Purchased natural sand must