Premixed concrete gravel aggregate production screening device and operation method

The invention discloses a premixed concrete sandstone aggregate production screening device and an operation method.The premixed concrete sandstone aggregate production screening device comprises a conveying pipe, a screening equipment feeding machine, screening equipment, a guide frame and a back crushing feeding machine, by arranging the conveying pipe, sandstone aggregates crushed by different crushing equipment are conveyed into the screening equipment feeding machine through the conveying pipe; the gravel aggregate is conveyed into the screening equipment through the screening equipment feeding machine to be subjected to multi-stage screening, after being screened, the gravel aggregate is guided to the different back-crushing feeding machines through the guide frame, and the screened gravel is conveyed into the different gravel crushers through the back-crushing feeding machines to be crushed; according to the device, gravel of different sizes enters a proper crusher to be crushed, gravel aggregate with