Flaw detection device for multi-bridge crack detection

The invention belongs to the technical field of bridge detection, and particularly relates to a flaw detection device for multi-bridge crack detection. The device comprises a vehicle plate, wheels andaxles, four supporting plates are fixedly connected to the lower end of the trolley plate; the axle is rotationally connected between every two corresponding supporting plates; two wheels are mountedon each axle; the device further comprises a motor, a first hydraulic cylinder and a controller. A first gear is arranged on one of the axles; a through groove is formed in the upper end of the vehicle plate; second gears are rotationally connected to the two groove walls of the through groove, and the first gears are engaged with the second gears. The motor is fixed to the upper end of the vehicle plate, and a third gear is installed on the output shaft of the motor. The third gear is meshed with the second gear; the vehicle plate drives the feeler lever to move to be matched with the elastic force of the conductive