Lower ejection mechanism for punching machine

The invention discloses a lower discharging mechanism for a punching machine. The lower discharging mechanism comprises a driving structure, a push rod, a swing frame, a rotating shaft and a connecting rod. Two second swing arms are arranged on the rotating shaft; an ejection structure is arranged between the second swing arms; the material ejecting structure comprises cantilevers rotationally arranged on the second swing arm, an ejecting block rotationally arranged between the cantilevers and an ejecting rod, wherein one end of the ejecting rod abuts against the ejecting block, and the other end of the ejecting rod is connected into a guide sleeve at the bottom of a workbench of the punching machine in a sliding mode. The switching part between the top block and the cantilever is positioned at the middle upper part of the top block; the contact surface of the ejector block and the ejector rod is arranged in the form of a concave arc with the radius of R; the bottom of the ejector rod is arranged in an arc-sh