Charging funnel for pre-splitting blasting of surface mine

The charging funnel comprises a funnel body and a wire conduit, the funnel body comprises a conical part with the upper portion being a horn opening and the lower portion being a closed opening, multiple sets of limiting rings are evenly arranged on the periphery of the conical part at intervals, a screen is obliquely arranged in the conical part, and the lower portion of the conical part is a closed opening. The wire conduit penetrates through the center of the screen through a shaft sleeve, a waste outlet is formed in the side face of the funnel body, a material guiding pipe is installed outside the waste outlet, the lowest end of the material guiding pipe is lower than the lowest end of the screen, a supporting block is arranged on the inner wall of the conical part in a surrounding mode, and the bottom of the screen is connected to the supporting block through a spring. The distance between the screen and the inner wall of the funnel body is 2-10 mm, and the limiting ring is made of flexible materials. Th