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最近西德Hngo Aeckerle 公司制造了一种Unilok有轨无轨联合机车(见附图),它无论在轨道上或离开轨道均可运行。在轨道上可作为调车机车用,一台45马力Unilok机车能发挥出4500公斤的有效牵引力,在时速不超过12公里时可牵引450公吨的列车。该机车在离开轨道时就变成一个有用的无轨车,可用来拖拉车辆和用其主液压起重机或叉式升降机来移动货架或装卸货物。若安装一些附加设备如:螺旋输送机、铲斗等,还可用来给铁路车辆装卸货物。在轨道上该机车用四轮驱动,前面两个轮子有轮缘,后面两轮无轮缘,以可伸缩的滚轮或液压升降高度可调的导轮限制;无轨道时,机车前面抬起靠两个自由旋转的橡胶轮子行走,所需动力全部由一对主动轮供给。由无轨变有轨或作相反的变化只需1分钟。
Recently, Hngo Aeckerle, a West German company, manufactures a Unilok rail-to-rail jointless locomotive (see photo) that operates both on or off the track. Orbiting as a shunting locomotive, a 45hp Unilok locomotive can deliver an effective 4500kg of traction and 450t at a speed of no more than 12km / h. The locomotive becomes a useful trolley when it leaves the track and can be used to tow the vehicle and move its shelves or load and unload cargo with its main hydraulic crane or forklift. If you install some additional equipment such as: screw conveyor, bucket, etc., can also be used to load and unload goods to railway vehicles. The track on the four-wheel drive, the front two wheels rim, the back two wheels without rims, retractable roller or hydraulic lift adjustable guide pulley limit; no track, the front of the locomotive lifts by Two freewheeling rubber wheels walk, all the power required by a pair of driving wheels. It takes only 1 minute from the trackless orbit change or vice versa.