目前,机车上所使用的前照灯都是固定安装在机车的正前方。因此,前照灯的光束不能改变方向。当列车夜间行驶到曲线区段时,前照灯的光束方向偏离线路,使司机看不清曲线线路上的障碍物和行人,影响行车安全。此外,在现有前照灯具上用的汞氢灯灯泡是竖直安装的,且反光镜呈浅抛物面形状,因此这种前照灯具的发光强度较低。 At present, the headlamps used on the locomotive are fixedly mounted in front of the locomotive. Therefore, the beam of the headlamp can not change direction. When the train travels to the curve section at night, the beam direction of the headlight deviates from the line, so that the driver can not see the obstacles and pedestrians on the curve line and affect traffic safety. In addition, the mercury vapor lamps used in the existing headlamps are mounted vertically and the reflectors are of a shallow parabolic shape so that the luminance of such headlamps is low.