Knife belt continuous grinding device of sponge rotary cutter

The utility model provides a continuous grinding device for a knife belt of a sponge rotary cutter, and belongs to the technical field of sponge processing equipment. Comprising a knife belt body connected end to end, two traction wheels for dragging the knife belt and at least one polishing assembly, the two traction wheels are arranged on an installation base, the installation base is fixed to a machine body of the sponge rotary cutter, each polishing assembly comprises a pin shaft fixed to the installation base, and the pin shaft is rotationally connected with two symmetrically-distributed polishing pieces. Each polishing piece comprises a mounting plate arranged on the pin shaft in a penetrating manner and a plurality of polishing pieces, the polishing pieces are uniformly distributed on the outer side of the pin shaft in the circumferential direction, a gap is formed between every two adjacent polishing pieces, an acute angle is formed between each polishing piece and the corresponding mounting plate, an