Sunken double-beam crane carriage

The utility model relates to the technical field of mechanical hoisting equipment, and discloses a sinking type double-beam crane carriage which comprises a beam frame, a movable groove is formed in the center of the beam frame, a center beam plate is movably connected in the movable groove, a jack is fixedly connected to the top of the center of the center beam plate, and the jack is fixedly connected with a lifting platform. A lifting rod is movably connected to the bottom of the jack, supporting rods are fixedly connected to the two sides of the center beam plate, and a protection box is fixedly connected to the sides, away from the center beam plate, of the supporting rods. Springs and damping plates are matched for use, so that the protection box can be damped and limited when the center beam plate and the auxiliary beam plate move, the protection box and the beam frame are prevented from being damaged due to collision between the protection box and the beam frame, the service life of the protection box