Automatic plate turnover device for coarse screen

The utility model relates to an automatic plate turning device for a coarse screen, which comprises the coarse screen and a coarse screen well, the lower part of the coarse screen is arranged in the coarse screen well, two sides of a well mouth of the coarse screen well are respectively provided with a plummer block, a rotating shaft is arranged between the two plummer blocks, a stainless steel pipe is arranged on the rotating shaft, and the stainless steel pipe is connected with the coarse screen well. An upper cover plate and a lower cover plate are welded on the stainless steel pipe, and N iron blocks are mounted in the upper cover plate; a magnet installation frame is installed on a well mouth of the coarse screen well, N electromagnets are installed on the magnet installation frame, the electromagnets can attract the iron blocks on the upper cover plate after being powered on, a photoelectric switch is installed on a support of the coarse screen, and the photoelectric switch and the electromagnets are co