Sand and stone screening device

The utility model relates to sand screening equipment, in particular to a sand and stone screening device. The sand and stone screening device comprises a base plate and a platform. The middle of the base plate and the middle of the platform are connected and fixed through a middle layer, and the platform is perpendicular to the axis of the middle layer. A connecting rod transmission wheel is installed in the middle layer, a track is arranged on the outer side of the middle layer, an air cylinder lifting device is installed at the bottom of the track, and a sand cart is fixedly connected with the air cylinder lifting device through a shaft telescopic arm. An air brake device is arranged on the base plate and drives the connecting rod transmission wheel to operate. An air receiving pipe is arranged at the bottom of the air cylinder lifting device, and a compressed air release port of an air compressor corresponds to the air receiving pipe. According to the sand and stone screening device, the air compressor drives the connecting rod transmission wheel, so that a box screens sand; the air compressor pushes the sand cart to transport sand to the platform when operating, so that sand screening efficiency is high, and energy consumption is small. Meanwhile, the box is divided into multiple sand screening chambers to screen the sand at multiple stages, and therefore different requirements of the market for the grain size of the sand and stone can be met.