In response to the issues of significant nutrient loss and blockage susceptibility in conventional forage harvesters during the process of chopping rapeseed,this paper presented the design of a chopping and anti-blocking system suitable for rapeseed forage harvesting.To explore the effects of various parameters of the chopping and anti-blocking system on anti-blockage performance and chopping performance,this study utilized the maximum velocity at accumulation point and the number of particles at accumulation point as anti-blockage performance indicators.An orthogonal rotation center combination experiment was conducted,considering the factors of side scraper plate angle and rotational speed.Furthermore,for the chopping performance indicators including the length qualification rate,chopping uniformity,and power consumption,response surface experiments are conducted with main shaft speed and feed rate as experimental factors.Experimental results demonstrate that the factors influencing the velocity at accumulation point,in descending order of significance,are the side scraper plate angle and the main shaft speed.The factors influencing the number of particles at accumulation point,in descending order of significance,are the main shaft speed and the side scraper plate angle.By selecting the minimum values of the maximum velocity at accumulation point and the number of particles at accumulation point as optimization objectives,the optimal combination of parameters for anti-blockage performance was obtained:side scraper plate angle of 11.9° and main shaft speed of 559 r/min,resulting in a particle velocity at accumulation point of 13.6 m/s and 13 particles at accumulation point.Regarding the effects on the length qualification rate,chopping uniformity,and power consumption,the factors in descending order of significance are the main shaft speed and the feed rate.By selecting the maximum values of the length qualification rate and chopping uniformity,and the minimum value of power consumption as optimization objectives,the optimal combination of parameters for chopping performance is determined as main shaft speed of 612 r/min and feed rate of 2 kg,resulting in a length qualification rate of 87.6%,chopping uniformity of 87.2%,and power consumption of 1.0 kJ.The above research and its results can serve as a references for the development of subsequent rapeseed forage choppers.
Rapeseed forageChopping deviceAnti-blockageDiscrete element method
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