Multi-stage limestone grinding and screening equipment

The invention relates to the technical field of grinding and screening, and particularly discloses multi-stage limestone grinding and screening equipment. Comprising a crushing table, a first grinding bin and a second grinding bin, and further comprises a crushing assembly and a protection assembly which are arranged on the crushing table and used for crushing and conveying limestone; the filter bin is used for preventing blockage during screening, limestone is ground into powder through a grinding roller in the grinding assembly after reaching the first grinding bin, then limestone powder falls into the filter bin below the grinding roller, at the moment, a cleaning brush can be used for cleaning the surface of a screen, the limestone powder is prevented from being accumulated at one position, and the screening efficiency is improved. And in the cleaning process, the striking column can strike the screen, after the striking column finishes striking, the buffer spring rebounds, and the screen tray is driven t