Widening frame for flat plate transportation semitrailer

The utility model relates to the technical field of widening frames, in particular to a widening frame for a flat plate transportation semitrailer. According to the technical scheme, the device comprises a contraction plate and mounting rods, a sliding frame is slidably mounted in the contraction plate, the mounting rods are fixedly mounted at the top of the sliding frame, limiting plates are fixedly mounted at the tops of the mounting rods, and a connecting plate is slidably mounted between the mounting rods. By arranging the limiting plate, the connecting plate, the top plate and the clamping plate which are matched with one another, cargoes can be conveniently limited through the limiting plate, meanwhile, the connecting plate can move along the mounting rod through the movable sleeve by rotating the lead screw, the connecting plate can be conveniently adjusted, and the working efficiency is improved. And the clamping plates can be attached to the tops of cargoes, the cargoes can be conveniently limited an