Grit screening machine for building

The utility model discloses a grit screening machine for building, including screening case and sand hopper, the top position department of screening case installs the sand hopper, and the sand hopperbe funnel -shaped structure, and first the effects filter screen of slope is installed to the bottom of sand hopper, just imitates the filter screen both ends and fixes respectively on the lateral wall of screening case and the baffle of arranging screening incasement portion in, and the discharge gate is located still to have seted up corresponding first extreme lower position of imitating the filter screen by the lateral wall of screening case, just imitate the filter screen under position department still be equipped with the decurrent guide plate of slope for leading -in to the filter screen in with the grit, the one end of guide plate is fixed on the inner wall of screening case, the filter screen is the arc structure, and the both ends of filter screen are passed through the backuppad and are installed at t