Gantry cranes

Gantry cranes have two upright supports (portals) which move along two ground based rails. The height

of the portals depends on the maximum hook height. Gantry cranes are used in factories and in outdoor

storage yards such as railway and shipping storage areas.

龙门起重机
龙门起重机有两个铁轨支撑，并且能在铁轨方向上移动
货物的起升高度取决于最大起升高度。龙门起重机用于工厂和室外
如铁路和航运贮存区堆场等场所