研究目的:铁路起重机作为-种铁路专用起重设备，其回送速度对铁路救援有十分重要的意义。以 NS1003型铁路起重机为对象，分析研究铁路起重机编组回送时通过沿途的铁路桥梁时，铁路起重机的轴重、轴距的改变对其过桥速度影响，为今后铁路起重机的设计提供分析方法。
研究结论:在起重机主要结构及其重心位置已经确定的情况下，可采用调节转向架轴距的办法来改善其回送性能。如果产品的设计周期比较短，可以先进行整机结构设计，最后通过调节起重机的转向架参数改善其回送能力。如果产品设计周期比较富余，通过不断地对起重机进行优化设计，通过调整起重机的重量及重心位置与调节起重机转向架的轴距和轴重相结合的办法，得到理想的起重机回送性能。
Research purposes ： As a special lifting equipment，railway crane speed in train marshalling and towing state has a great significance for railway rescue. NS1003 railway crane is taken as the object of study, when it runs through the railway bridges along the way in marshalling and towing state, the effect of axle load and wheelbase changing on running speed on bridges is analyzed, to provide analysis method for railway crane design in the future.
Research conclusions ： When the main structure and gravity center position of the crane are confirmed, the bogie wheelbase can be adjusted to improve its echo performance. If the product design cycle is short, first design the whole machine structure, finally adjust the parameters of the crane to improve its echo performance. If the product design cycle is long, constantly optimize the crane design, use the method which adjusting the weight and gravity center location of the crane and crane bogie wheelbase and axle load, to get ideal crane echo performance.
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