Simulation On The Performance Of Three Kinds Of Basecutters Of Sugarcane Harvester

China’s sugarcane cultivation was mainly concentrated in Guangxi,Yunnan,Guangdong provinces,and its total planting area ranks third in the world.At present,sugarcane combine harvesters in China was mainly chopping harvester.In the process of harvesting sugarcane,the chopping harvester had a problems of high impurity rate,high stubble damage rate and high billet breakage rate.The soil mixed with billets during had a big negative influence on the sugar mill process and sugar quality.It was the main reason why the sugar mills resisted the billets by harvester.In this paper,three kind of basecutters independently developed by our team were studied.Based on EDEM software,the process of sugarcane basecutter blades cutting into the soil was analyzed,and the effects at different parameters on the amount of soil sent into the sugarcane feeding channel by basecutter was studied.Based on dynamic simulation software ADAMS,the sugarcane basecutter feeding and conveying sugarcane process simulation were analyzed.According to the simulation results,the feeding and conveying performance of different cutters was evaluated,which provided a reference for the design and optimization of working parameters of sugarcane basecutters.The main researches and conclusions were as follows:(1)Comparison and theoretical analysis of different sugarcane basecutters.The structural differences among "disc + toothed bar",leaking soil cutter disc,and spiral lifting round steel rod three kinds of basecutters were analyzed.Their working principles were analyzed.The assembly relationship between basecutter and the rollers were built.The size of the feed inlet area of those basecutters were calculated.The feed inlet area of the cutter lifted by the spiral round steel was smaller,so in comparison,the other two basecutters can have larger feed rate.(2)Simulation test of sugarcane basecutter cutting process.Using Creo and EDEM software together,the soil particle models of sugarcane ridges and different structure cutters were built to simulate the cutting process of the blades into the soil.The movement of the soil particles after cut by blades were analyzed.Based on the model,simulation complete grouping tests of 3 factors 3 with levels and 2 factors with 3 levels were conducted.Set the amount of soil sent by the cutter disc into the conveying channel as the test index.Under the conditions of cutter speed was 650 r/min and blade depth was 70 mm,3 factors with 3levels were as follows: factor A was basecutter structure,3 levels were above three structure basecutters;factor B was cutter angle,3 levels were 10°,20°,and 30°;factor C was ground speed,3 levels were 0.5 m/s,0.75 m/s,and 1 m/s.Under the conditions of cutter speed was 650 r/min and ground speed was 0.5 m/s and oblique angle of basecutter disc was 20°,2 factors with 3 levels were as follows: factor A was basecutter structure,3 levels were above three structure basecutters;factor B was depth of blade cutting in soil,3 levels were 70 mm,85 mm,and 100 mm.The results of 3 factors and 3 levels showed that the influence of the amount of soil entering the conveying channel from the primary to the secondary order was the disc oblique angel,ground speed,and basecutter structure;the influences of the three factors on the test indicators were all extremely significant;The factors between the levels of disc oblique angle were significantly different,and the amount of soil entering the conveyor channel decreased with the increase of disc oblique angle;the difference between the ground speed of 0.75 m/s and 1 m/s was not significant,and the difference between 0.5 m/s.The difference between 0.75 m/s and 1 m/s was significant.The amount of soil entering the conveying channel was the smallest when the ground speed was 0.5 m/s.The result of the 2 factors 3 levels test showed that the structure of the cutter and the depth of blades cutting soil had a significant effect on the amount of soil entering the transportation channel;the difference between the levels of depth of blades cutting soil was significant,and the amount of soil entering the transportation channel increased with the depth of blades cutting soil increasing.Both sets of tests showed that there were no significant difference between the level of the "disc + toothed bar" basecutter(A1)and the leaking cutter disc basecutter(A2),which meant that the leakage effect of the leaking cutter disc was not obvious,and the reasons of that were analyzed;The difference among the spiral round steel rod lifting cutter(A3)and A1,A2 were significant.When blades of spiral round steel lifting rod basecutter(A3)cutting into soil,the amount of soil entering the conveying channel was the least.(3)Simulation analysis on feeding and conveying performance of three structural sugarcane basecutters based on ADAMS.The model of sugarcane and basecutter feeding and conveying system model were built by Creo and ADAMS software respectively.Single factor test was conducted on the sugarcane transport speed of three basecutters with different structures.The factor was the rotation speed of the basecutter,3 levels were 600r/min,650 r/min,and 700 r/min.Through the analysis of the transportation process of sugar cane,the movement forms of sugar cane under the action of cutters with different structures were comparatively studied.The test result showed that the average speed of sugar cane was the highest when it was lifted by the spiral round steel basecutter,So the feeding and conveying performance was the best.The average speed of sugarcane through the cutter of "disc + toothed bar" basecutter was the same as that of the cutter with earthen leakage,there was no difference in the feeding and conveying performance,which meant that the leaking cutter disc had no effect on the conveying performance of the cutter.