Screening and classifying device for crushed waste steel and iron

The invention discloses a screening and classifying device for crushed waste steel and iron, which comprises fixed racks, a belt conveyor and a conveying partition plate, the belt conveyor is mounted between the two fixed racks, the conveying partition plate is mounted on the surface of a belt of the belt conveyor, and an impurity cleaning mechanism is arranged on the fixed racks. A size classification mechanism is arranged on the fixed rack; the impurity cleaning mechanism comprises a [-shaped fixing frame, an iron block moving part, a cleaning part and an absorbing and filtering part; the size classifying mechanism comprises a screening frame, a large block collecting box, a small block collecting box and a screening hole adjusting part, and the screening hole adjusting part adjusts the size of screening holes. The iron and steel scrap screening device has the beneficial effects that iron and steel scrap blocks can move left and right in the conveying process, impurities can be completely discharged, the im