龙门起重机英语翻译
gantry crane
或
portal crane

龙门起重机英语例句
LDY8 gantry crane for transporting sleeper 
LDY8型运枕龙门起重机 

Application of slippage dragging technology to transferring of large portal crane
滑移拖曳工艺在大型龙门起重机搬迁中的应用