Special gantry crane for automobile engine rotational inertia test

The utility model discloses a special gantry crane for an automobile engine rotational inertia test. The special gantry crane comprises a suspension arm beam, supporting devices, a roller device, hand-chain hoists, a connecting device, wheels and fixing devices, and is characterized in that the suspension arm beam comprises two pieces of parallel I-steel which are arranged at an interval, two ends of the suspension arm beam are connected with upper ends of the support devices through bolts respectively, and directional wheels and universal wheels are arranged at lower ends of the support devices respectively; the roller device comprises a fixed roller and two movable rollers and is arranged on the suspension arm beam, and a reinforcing steel bar is arranged between the movable rollers; the hand-chain hoists comprise lifting hand-chain hoists and a transverse moving hand-chain hoist, the lifting hand-chain hoists are arranged under the suspension arm beam, and the transverse moving hand-chain hoist controls the lifting hand-chain hoists to move after bypassing the fixed roller and the movable rollers through the connecting device. The special gantry crane for the automobile engine rotational inertia test has the characteristics of safety, stability, reliability, simplicity, economic efficiency, practicability, good operability, low cost and the like, and has good practicability and reliability.