Sandstone separator with pre-crushing function

The utility model relates to a sandstone separator with a pre-crushing function. The invention relates to the technical field of gravel separation, the crusher comprises a shell and a crushing mechanism, the two ends of the shell are open to form a feeding end and a discharging end. A discharge groove is formed in the discharge end; wherein a filter cartridge is coaxially arranged in the shell; aseparation motor for driving the filter cartridge to rotate is arranged at the discharge end of the shell; a discharge port is formed in the lower side of the shell; the feeding end is connected witha crushing mechanism; the crushing mechanism comprises a crushing box which is arranged at the feeding end and provided with an opening in the top, two crushing rollers are horizontally and rotationally connected to the opening in the top of the crushing box, a power assembly used for driving the crushing rollers to rotate is installed on the outer side of the crushing box, an opening is formed inthe bottom of the crushing