铁道部贵阳车辆厂工具、机械车间先后制作了PH—300J 新型平衡吊。该平衡吊是根据力的平衡原理设计的,水平移动可随意平衡,吊重300公斤,手推力不大于3—4公斤。平衡吊由回转座、传动箱、操作臂、电机和电器装置组成。为防止过载和 Ministry of Railways Guiyang vehicle factory tools, machinery workshop has produced a new balance PH-300J hanging. The balance crane is designed according to the principle of balance of forces, horizontal movement can be freely balanced, lifting 300 kg, hand thrust not more than 3-4 kg. Balance by the swivel base, gearbox, control arm, motor and electrical devices. To prevent overload and