Rod pin fixing structure of sand mill

The invention belongs to the field of grinding machinery, and particularly relates to a rod pin fixing structure of a sand mill. An arc-shaped clamping block is fixedly connected to the interior of the fixed disc; a rod pin is inserted into the fixed disc; a plurality of groups of rod pins are inserted into a fixed disc in a sliding manner, two groups of arc-shaped clamping plates are respectively clamped on the inner walls of arc-shaped clamping blocks, and a top plate is supported at the bottom ends of the arc-shaped clamping plates by a first elastic piece, so that the rod pins are clamped and limited, and a magnet is used for repulsing a magnetic plate in a homopolar manner, so that a single group of worn rod pins can be quickly disassembled and replaced; an arc-shaped clamping plate is used for extruding a top plate to slide, an extrusion plate extrudes lubricating oil in a fixed disc, the lubricating oil is sprayed to the surface of a rotating rod from a one-way valve, the fixed disc can be conveniently