Automatic sampling device

The automatic sampling device comprises a fixing frame, a driving motor and a sampling hopper, the bottom of the fixing frame is fixedly connected with a sampling box, one side, close to the sampling hopper, of the sampling box is fixedly connected with a feeding port, the inner wall of the sampling box is rotationally connected with a pair of rotating plates, and the bottoms of the rotating plates are provided with elastic mechanisms; a top screen is arranged on the inner wall of the sampling box and located below the rotating plate, a top sampling opening is formed in the side, corresponding to the top screen, of the side wall of the sampling box, and a bottom screen is arranged on the inner wall of the sampling box and located below the top screen. The coal mines with large sizes enter the external sampling box through the material guide plate, the coal mines with medium sizes enter the external sampling box through the bottom screen mesh, and the coal mines with small sizes fall into the internal sampling