Stripping mechanism and Gaussian distribution model of a concave bionic comb for stripping prior to cutting

Stripping prior to cutting is a harvesting technique that only strips rice grains and obtains complete straws. This paper aims to solve the problems of high loss rate and short throwing distance for stripping prior to cutting. A concave bionic comb was developed based on the filiform papilla structure on the surface of a cattle tongue tip. The mechanism analysis and comparative research of the flat comb and the bionic comb were carried out. The results showed that when the arc radius was 5.0 mm, the magnification ratio of filiform papilla was 4.0, and the concave angle was 60°, the loss rate of falling grain was 4.3 %, and the loss rate of uncombed grain was 2.8 %. The diffusion angle of bionic comb was smaller than that of flat comb. The distribution characteristics of the thrown materials conformed to Gaussian distribution. Under the same working conditions, the falling grain loss rate and uncombed loss rate of the bionic comb were always lower than that of the flat comb. This study provides reference for the cross application of bionic technology and crop production field, promotes the harvesting way application of stripping prior to cutting in gramineous plants such as rice, wheat and sorghum, and provides a basis for harvesting the whole straws and expanding the way of comprehensive utilization of straws.