Sample crushing device for chemical analysis

The invention relates to the technical field of chemical analysis, and discloses a sample crushing device for chemical analysis, the sample crushing device comprises a sealing cylinder, a crushing rod is rotatably connected to the central axis position of the sealing cylinder, and a plurality of groups of crushing cutters are uniformly distributed on the outer side of the crushing rod; the device further comprises a feeding hopper installed at the top of the sealing barrel, the top of the feeding hopper is fixedly connected with a feeding pipe, the smashing rod is arranged in the feeding pipe and rotationally connected with the feeding pipe through a bearing seat, and the smashing rod vertically extends upwards and penetrates through the interior of the feeding pipe. Unqualified crushed materials are automatically introduced into the spiral feeding assembly through the material returning assembly, then the unqualified crushed materials are automatically introduced into the sealing cylinder through the spiral