Linear speed protection device suitable for wheel magnetic particle flaw detector

The utility model discloses a linear speed protection device suitable for a wheel magnetic particle flaw detector, which comprises a base, the upper surface of the base is fixedly connected with two vertical plates, the side walls of the vertical plates are fixedly connected with a first motor, the output end of the first motor is fixedly connected with a first fixed cylinder and a moving assembly, and the moving assembly is fixedly connected with a second fixed cylinder. The moving assembly comprises a second fixing cylinder, a positioning plate is fixedly connected to the inner wall of the second fixing cylinder, a spring is fixedly connected to the side wall of the positioning plate, a moving plate is fixedly connected to one end of the spring, a second rotating column is arranged in the base, and a shell is rotatably connected to the outer wall of the second rotating column. According to the wheel fixing device, one end of a wheel is placed in the second fixing cylinder and moves towards the moving plate