SEVENCRANE下悬桥式起重机是一种水平放置在车间、仓库和堆场上方用于吊运物料的起重设备。由于它的两端位于高高的水泥柱或金属支架上，所以看起来像一座桥。桥式起重机的桥架沿着两侧高架结构铺设的轨道纵向运行，充分利用桥下空间吊运物料，不受地面设备阻碍。它是应用最广泛、种类最多的起重机械。

具有完整跑道的下悬式桥式起重机主要用于室内机械制造加工车间、装配车间、仓库、料场的物料运输，用于起吊发电厂等固定维修设备等场合。也可用于冶金、铸造车间作为辅助起重设备。另外，不宜用于易燃、易爆、可燃气体、粉尘及腐蚀性气体环境。但不适用于核辐射环境和有毒气体环境。

Underhung cranes are lifting equipment that are placed horizontally over workshops, warehouses and stockyards for lifting materials. Because the two ends of the bridge's underhung cranes are located on tall cement columns or metal supports, and are shaped like a bridge, they are commonly known as "overhung cranes" and "driving cranes." It is a kind of lifting machinery with wide range of use and large quantity.

After understanding the basic parameters of underhung cranes, we must also understand the metal structure frame structure of the bridge crane in detail. Let’s share it with you. The metal structure of underhung cranes is the skeleton of the crane, on which all mechanical and electrical equipment are distributed. It is the load-bearing structure of the crane and makes the crane form a whole mechanical equipment.