Bridge bottom surface crack detection device

The utility model discloses a bridge bottom crack detection device, which is characterized in that one side of a support frame is rotatably provided with a travelling wheel, one side of the support frame is connected and provided with a vacuum generator, one side of the vacuum generator is provided with a gas delivery pipe, one side of the top of the support frame is provided with a support shaft, and the support shaft is provided with a gas delivery pipe. A first driving air cylinder is installed at the top of the supporting shaft, an adjusting mechanism is connected to one side of the first driving air cylinder, a second driving air cylinder is fixedly installed on one side of the adjusting mechanism in a sliding mode, a plurality of anti-skid protrusions are arranged on the surface of the walking wheel, a conversion pipe is installed on one side of the walking wheel, and a balance weight pin column is fixedly installed on one side of the walking wheel. According to the scheme, the holes in the surfaces of