Reamer bit structure

A hole-dilating drill structure comprises a drilling rod, a cutter blade, and an ejector rod, wherein a spline groove is processed at the tail end of the drilling rod and connecting with a driving device. The invention is characterized in that opening straight grooves are respectively opened at two sides of the head of the drilling rod, the cutter blade is arranged in the opening straight groove through a pin; a hole is drilled at the head of the drilling rod, the inner surface of the hole has screw thread, the tail end of the ejector rod is provided with screw thread matting with the screw thread in the hole of the drilling rod and processed with a step, the middle of the ejector rod has conical shape, and the top of the ejector rod is provided with a stand bar; and a small bolt hole is processed in the middle position of the hole on the drilling rod and used for arranging a positioning bolt. The hole-dilating drill structure provided in the invention has the advantages of simple structure, convenient operat