果蔬三维切丁机设计与试验

为了提高国产切丁机的切削质量和切削效率,设计了一种新型果蔬切丁机.该机采用旋转推进器送料,离心切削法切片,圆盘格栅刀切丝,最后由切丁条刀切丁的三维切丁技术.论文阐述了切丁机结构组成及工作原理,并以马铃薯为切削对象,进行了物料在离心切削滚筒内的受力分析计算,确定出切削滚筒最小工作转速为133.3 r/min;对所切物料丁断面曲线方程分析,得出切丁断面具有3种不同形状,通过比较不同离心切削滚筒与切丁条刀转速比条件下的切丁断面形状及偏差,得出其最佳速比为0.17.样机切削性能试验表明:切出的15 mm× 15 mm×15 mm和20 mm×20 mm×20 mm马铃薯立方块形状规整,其相对偏差分别为11.7％、12.7％,均小于15％,达到了预期目标,为新型果蔬三维切丁机的研制提供了参考.

Design and experiments of the fruit and vegetable three-dimensional dicing machine

In order to improve the cutting quality and cutting efficiency of domestic dicing machine , a new fruit and vegetable dicing machine was designed. The machine adopted three-dimensional dicing technology, including rotary propeller feeding, slicing by centrifugal cutting method, shredding by disk grill knives and finally dicing by crosscut knives. The structure and working principle of the machine was described, the forces of potato in centrifugal cutting roller was studied, and then the minimum rotating speed of the roller was determined (133.3 r/min). Analysis of small cross-section curve equation, diced cross section could be found in three different shapes. By comparing the diced cross-section shape and bias under the different corresponding rotating speed ratio between centrifugal cutting roller and crosscut knives, the optimum ratio was obtained(0.17). Prototype cutting experiments showed that smooth potato cubes with specifications of 15 mm × 15 mm × 15 mm and 20 mm × 20 mm × 20 mm were cut out, the relative percentage of irregularity degree was 11.7% and 12.7%, all less than 15%.Therefore, the expected target has been achieved, and a reference was provided for the development of new fruit and vegetable dicing machine.