塘沽海门大桥为一座垂直提升式的公路开启桥。活动孔采用两套提升设备,分别安装在南北塔楼顶部的机房内。提升机系统由拖动的交流电动机、机械传动系统、卷筒、盘形制动器和液压站、平衡电机(电轴电机)、电气控制设备等组成。通过平衡电机的电轴作用实现两提升机同步运转,使活动孔桥跨在启闭过程中 Haimen Bridge in Tanggu is a vertically elevated open road bridge. Activities holes using two sets of lifting equipment, respectively, installed in the top of the north and south towers of the engine room. Hoist system by the drag AC motors, mechanical transmission systems, drums, disc brakes and hydraulic stations, balancing motor (electric axis motor), electrical control equipment and other components. By balancing the role of the motor shaft to achieve synchronous operation of the two elevators so that the activities of the bridge across the opening and closing process