Rod pin structure

The invention belongs to the field of rod pin sand mills, and particularly relates to a rod pin structure which comprises a rod pin disc. A plurality of groups of rod pin plates are arranged; the interior of the rod pin disc is rotationally connected with a plurality of sets of rotating discs. The rod pin disc is a fixed frame of a rod pin structure, the rod pin rod and the first grinding block are fixed into the rotary disc, switching is conducted when different materials are ground, the situation that assembly is replaced when the different materials are ground is reduced, the disc is matched with multiple sets of limiting pins to be inserted into the rotary disc for limiting, and the grinding efficiency is improved. A bolt penetrates through a limiting frame to be in threaded connection with the interior of a splicing rod, multiple sets of rod pin discs are spliced, the output end of a servo motor is used for driving a rod pin structure connected with a rotating rod to rotate, materials in a filter screen