Accurate walnut shell breaking device with high kernel rate and shell breaking method

The invention discloses an accurate walnut shell breaking device with a high kernel rate and a shell breaking method. The accurate walnut shell breaking device comprises an automatic system composed of a walnut grading unit, a grading transmission unit, a plurality of walnut shell breaking units and a plurality of shell breaking transmission units. The dried walnuts conveyed by the previous process are graded according to the size through the walnut grading unit, the graded walnuts respectively fall into the shell breaking units with different shell breaking gaps according to the size to be subjected to accurate shell breaking, and finally the shell and kernel mixture obtained after shell breaking is conveyed to the next process system. The purposes of accurately breaking shells of walnuts and improving the high kernel rate of the walnuts are achieved, and the whole system works in a full-automatic mode. The walnut shell breaking machine has the advantages of being flexible in structural arrangement, small in