The crane uses hanging beams to lift long steel billets, plates, bars, discs and other items, and is equipped with electromagnetic suction cups or clamps or special group hooks for hoisting. It consists of a room and an electrical control system, equipped with a power failure magnetic protection system. The lifting mechanism mostly adopts a single motor, double reducer, and double drum arrangement, in the form of double lifting points. There are two types of hanging beam layout: perpendicular to the main beam or parallel to the main beam. The rest of the form is the same as the QD crane.