Abstract: The structure of the doubleacting reciprocating cutter intended for green leafy vegetable harvesting was designed, and the performance of the cutter was optimized based on the cutting diagram. By analyzing the effect of the single cutting area, the repeat cutting area and the uncut cutting area in the cutting diagram on cutting performance, it is concluded that the cutting performance of the cutter is best when the area of the uncut cutting area is 0 and the rate of the repeat cutting area is minimal, this is used as a basis for optimizing the design of the cutter. To address the problem that the existing methods of drawing and analyzing cutting diagrams do not combine high accuracy and simple operation, combining SolidWorks and Adams to draw cutting diagrams, and using ImagePro Plus software to identify and measure the relevant data in the cutting diagrams to quantitatively analyze and evaluate the cutting diagrams. In order to solve the problem that the existing cutting diagram evaluation index does not significantly reflect the change of cutting performance under the joint influence of dimensional and kinematic parameters of the cutter, it is proposed to use the distance indicating the uncut area and the rate of the repeat cutting area as evaluation indexes to reflect the changes of the three regions in the cutting diagram, and using these two evaluation indexes as target values, optimizing the cutting performance of the existing doubleacting reciprocating cutter. The study proposes to use this method of drawing, analyzing and evaluating cutting diagrams to further optimize cutting performance, analyzing the effect of the cutters size parameters (width of moving blade front end, height of moving blade cutting edge, blade spacing) and motion parameters (cutting speed index) on the distance indicating the uncut area and the rate of the repeat cutting area, using BoxBehnken central combinatorial experimental design to conduct a fourfactor and threelevel simulation test, the experimental results show that width of moving blade front end, height of moving blade cutting edge, blade spacing and cutting speed index have significant effects on the distance indicating the uncut area and the rate of the repeat cutting area. Parameter optimization results showed that  when width of moving blade front end was 5 mm, the height of moving blade cutting edge was 32 mm, the blade spacing was 30 mm, and the cutting speed index was 0.7, the area of the uncut cutting area was 0, the rate of the single cutting area was 88.26%, and the rate of the repeat cutting area was 11.74%. Compared with the results before optimization, the area of the uncut cutting area was still 0, but the rate of the single cutting area was increased by 6.18% and the rate of the repeat cutting area was reduced by 6.18%.

Key words: multifunctional harvester, green leafy vegetable, reciprocating cutter, cutting diagram, response surface method

摘要： 针对绿叶菜收获拟采用双动刀往复式切割器进行结构设计，并基于切割图进行切割器性能优化。通过分析切割图中一次切割区、重割区和漏割区对切割性能的影响，确定漏割区面积为0、重割率最小时割刀切割性能达到最优，以此为依据对切割器进行优化设计。针对现有切割图绘制与分析方法不能同时兼顾高精度和易操作的问题，综合运用SolidWorks和Adams软件进行切割图绘制，并使用ImagePro Plus软件获取图中数据对切割图定量分析与评价。针对现有切割图评价指标不能显著反映刀片尺寸参数和割刀运动参数共同影响切割性能变化问题，提出以漏割距离、重割率为评价指标来反映三区域的变化，并以此为目标值，基于现有刀片尺寸参数优化其切割性能。研究提出采用切割图绘制、分析、评价方法进一步优化切割性能，分析割刀尺寸参数（刀片前宽、刀片高度、刀片节距）和切割器运动参数（切割速比）对漏割距离和重割率的影响，采用BoxBehnken中心组合试验设计理论进行四因素三水平仿真试验。试验结果表明，刀片前宽、刀片高度、刀片节距、切割速比对漏割距离和重割率均有显著影响。参数优化结果：当刀片前宽为5 mm、刀片高度为32 mm、刀片节距为30 mm、切割速比为0.7时，漏割区面积为0、一次切割率为88.26%、重割率为11.74%，与优化前相比，漏割面积仍为0，但一次切割率提高了6.18%，重割率降低了6.18%。

关键词: 多功能采收机, 绿叶菜, 往复式切割器, 切割图, 响应面法