Reversible plate positioning device for stationary radiation imaging trailer system

The present invention discloses a reversible plate positioning device for a stationary radiation imaging trailer system, comprising a left platform (-) and a right platform (-) that can be connected with a trailing part of a trailer frame and ground locking part, the left platform (-) and right platform (-) provided with slopes for the uploading of a vehicle to be detected respectively at the front ends and with positioning recesses at the middle of an upper surface, each positioning recess being provided with a wheel-locking device, wherein, each wheel-locking device comprises of a pivotable crank plate that is hinged to the positioning recess and can rotates about the pivot axis thereof, a chain connected with the crank plate, a pull-rod connected with the chain, and a fixing sleeve corresponding to the pull-rod, in which a spring is provided in the fixing sleeve, and when the vehicle to be detected is located in the positioning recesses, each crank plate rotates around the pivot axis thereof under the elastic force of the spring so that the crank plate is tilted at the front of each positioning recesses, and thus the wheels are locked in the positioning recesses, a carrier rod biasing the spring is respectively provided at the end of each fixing sleeves, when the trailer is arrived, the carrier rods bias the springs under external force, so that each crank plates slacks under the function of the pull-rod. By the aforementioned device, the vehicle to be detected can be stably driven out of the trailer platforms, avoiding the impact to the vehicle to be detected and the trailer during downloading.