Grinding blades

The invention discloses grinding blades, and relates to a grinding part, in particular to a moderate grinding part. The technical aims that heat dissipation and bran removal are easy in the grinding process, and meanwhile a grinding blade can bear enough pre-tightening force and keep the shape stable are achieved. The grinding blades are provided with supporting columns, the multiple grinding blades are connected together in series, and the grinding blades make contact with one another in sequence through the supporting columns. The supporting columns not only can keep the gaps between the grinding blades, but also can ensure that the gaps between the grinding blades are not sealed, and the gaps are beneficial for transmitting the temperature generated during grinding out from the upper end, and also beneficial for extracting the ground bran from the upper end. The supporting columns which are in contact with each other in sequence enable the rigidity of the grinding blades which are connected together to be