Patent ID: 7367764

Claim:
A reversible plate positioning device for a stationary radiation imaging trailer system, comprising a left platform ( 7 - 1 ) and a right platform ( 7 - 2 ) that can be connected with a trailing part ( 4 ) of a trailer frame and a ground locking part ( 12 ), the left platform ( 7 - 1 ) and right platform ( 7 - 2 ) being provided at the front ends thereof with slopes ( 1 ) for the uploading of a vehicle to be detected respectively and at the middle of an upper surface with positioning recesses ( 9 ), each positioning recess ( 9 ) being provided with a wheellocking device ( 2 ), wherein: each wheel-locking device ( 2 ) comprises: a pivotable crank plate ( 10 ) which is hinged to the respective positioning recess ( 9 ) and can rotate about a pivot axis thereof; a chain ( 15 ) connected with the crank plate ( 10 ); a pull-rod ( 14 ) connected with the chain ( 15 ), and a fixing sleeve ( 6 ) corresponding to the pullrod ( 14 ), wherein: a spring ( 13 ) is provided in the fixing sleeve ( 6 ), and when the vehicle to be detected is located in the positioning recesses ( 9 ), each crank plate ( 10 ) rotates around the pivot axis thereof due to the elastic force of the spring ( 13 ) so that the crank plate ( 10 ) is brought into a lifted-up state at the front portion of each positioning recess ( 9 ), thereby wheels of the vehicle are locked in the positioning recesses ( 9 ), a carrier rod ( 5 ) capable of compressing the spring ( 13 ) is respectively provided at an end of each fixing sleeve ( 6 ), and when a trailer is landed at a bank, the carrier rods ( 5 ) compress the springs ( 13 ) due to external force, so that each crank plate ( 10 ) is brought into a slacked state due to operation of the pullrod ( 14 ).