刀盘内倾式甘蔗切根装置设计与试验

针对现有甘蔗收获机切根装置存在刀盘最大入土位置与切根位置不重合的特点，及由此造成的原料蔗含杂土较多的问题，设计了一种刀盘内倾角可调式切根装置，可实现最大入土位置与切根位置重合。以刀盘转速、刀盘内倾角为影响因素，以破头率、含杂率为指标，通过二次正交旋转中心组合试验得到了其性能指标和工作参数的响应曲面模型。试验结果表明，刀盘倾角对破头率、含杂率影响较大。通过多目标优化，得到了最佳工作参数组合为刀盘转速269 r/min、刀盘内倾角16.4°。该最佳参数组合下期望结果为破头率9.45%、含杂率6.61%，验证试验结果为破头率9.66%、含杂率6.88%。通过对比试验发现，在维持破头率基本不变的前提下，内倾式刀盘与原刀盘相比含杂率降低10.6%。 

Design and Experimental Study of Base Cutter with Inward-leaning Angle in Sugarcane Harvester

Existing base cutter in sugarcane harvester has obvious problem that maximum soil-intrusion position was inconsistent with root cutting position，which caused increased both in power dissipation and impurities rate（high content of mixed soil）.In view of this problem，a base cutter with inward-leaning angle was developed.With dish rotating speed and inward-leaning angle as influencing factors，root rupture rate and impurities rate as experimental indexes，quadratic orthogonal rotation center combination experiments were carried out and response surface models of performance indexes and working parameters were obtained.Experimental results showed that inward-leaning angle had a greater influence on impurities rate，and dish rotating speed had obvious significance on both indexes.Optimal combination of working parameters was obtained by multi-objective optimization with dish rotating speed of 269 r/min and inward-leaning angle of 16.4°.Expected results of root rupture rate and impurities rate were 9.45% and 6.61% respectively，and verification experimental results were 9.66% and 6.88%.Comparison test showed that base cutter with inward-leaning angle got 10.6% reduction in impurities rate compared to original models with a prerequisite of a better root rupture rate.