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Electric hoist bridge crane is a small light lifting equipment. Gourd with small size, light weight, simple operation, easy-to-use features such as for industrial and mining enterprises, storage terminals and other places.By electric hoist motor, drive mechanism and the composition of drum or sprocket can be used alone can also be assembled together with the car flying in the use of a crane beam, LH electric double-beam bridge crane hoist with the traditional double-beam bridge crane is the difference between electric hoist drum to replace the small car, motor. Reducers, brakes and other lifting devices. This article mainly deals with electric hoist bridge crane to do the main body of analysis and calculation, including the electric hoist lifting body, and the operation of car bodies.