Dotrum clamshell bridge cranes are widely used in power plants, freight yards, workshops, docks, etc., and are mainly responsible for operations such as feeding, handling, mixing, taking and weighing. The crane can realize manual, semi-automatic and fully automatic control. It has a heavy duty work system with A6 working level. The rated lifting capacity is generally 5 ~ 20t. Grab opening direction can be parallel or vertical to the main beams. The picking device is a four-rope grab with double reels, which has a simple structure and reliable operation. The grab can be opened and closed at any height. It can be used indoors or outdoors. Add rain cover when outdoor use.