微耕机刀辊降耗和机具匀速钢带驱动的试验
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摘要
由汽油机提供动力的自走式微耕机耕作时匀速性差,旋耕刀辊每转不同时刻的切土阻力和功耗波动较大。为了提高刀辊的切削稳定性及整机的操控性,对刀辊进行了改进设计,并为某型号微耕机增配了地轮驱动系统。对原刀辊和改进刀辊的切土过程进行的数值模拟结果表明:改进和优化后的刀辊切土功率峰值和平均功率分别比原刀辊降低了32.3%和41.5%,最大切削阻力降低了49.9%,切削力和切土功率波动有效减小,为机具增配驱动轮提供了功率保障。改进前后机具的对比试验表明:改进后的机具工作正常,未出现功率不足的现象,且具有更好的耕作匀速性,操控难度降低,耕作效率提高。研究结果为同类微耕机增配使机具匀速前进的驱动系统提供了理论依据。
The self-propelled micro-tiller,which is powered by a small gasoline engine,has a poor uniform speed duringthe tillage,and the cutting resistance and power consumption fluctuates greatly at different times. To improve the cutting stability of the knife roller and the handling of the whole machine,the steel belt drive wheel is equipped with a certain type of handheld tiller,and the knife roller is improved. The numerical simulation results of the cutting process of the original and the improved knife roller show that the peak and average power of the cutting progress are reduced by 32.3% and 41. 5%,and the maximum cutting resistance reduced by 49. 9%,the cutting force and cutting power fluctuations effectively reduced,which provides power protection for the machine with additional drive wheel. The test result of the soil bin experiment shows that: the improved machine can work normally,and there is no power shortage phenomenon,the tillage speed uniformity is better,the difficulty of manipulation is reduced and the tillage efficiency is improved.The results provide a theoretical basis to add the uniform speed drive system for the same kind of micro-tiller.
The self-propelled micro-tiller,which is powered by a small gasoline engine,has a poor uniform speed duringthe tillage,and the cutting resistance and power consumption fluctuates greatly at different times. To improve the cutting stability of the knife roller and the handling of the whole machine,the steel belt drive wheel is equipped with a certain type of handheld tiller,and the knife roller is improved. The numerical simulation results of the cutting process of the original and the improved knife roller show that the peak and average power of the cutting progress are reduced by 32.3% and 41. 5%,and the maximum cutting resistance reduced by 49. 9%,the cutting force and cutting power fluctuations effectively reduced,which provides power protection for the machine with additional drive wheel. The test result of the soil bin experiment shows that: the improved machine can work normally,and there is no power shortage phenomenon,the tillage speed uniformity is better,the difficulty of manipulation is reduced and the tillage efficiency is improved.The results provide a theoretical basis to add the uniform speed drive system for the same kind of micro-tiller.
引文
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[2]张晓东,杜芝枚.1GW-6.8型棚室用微耕机的研究设计[J].农机使用与维修,2006(6):12-14.
[3]徐成刚,李兵,李尚庆,等.便携式茶园微耕机的设计研究[J].农机化研究,2016,38(5):107-111.
[4]王小勇,李兵,李尚庆,等.茶园微耕机的设计分析[J].农机化研究,2016,38(1):101-105.
[5]应义斌,蒋焕煜.蔬菜棚室用自走式微型耕机的研究[J].农业工程学报,1997,13(1):88-91.
[6]卢剑锋,张柯柯,张富贵.坡地用微耕机犁具的改进[J].贵州农机化,2012(4):9-12.
[7]葛云,吴雪飞,王磊,等.Math CAD在微型旋耕机旋耕刀轴优化设计中的应用[J].农机化研究,2008(2):121-122.
[8]牛坡,杨玲,张引航,等.基于ANSYSWorkbench的微耕机用旋耕弯刀有限元分析[J].西南大学学报:自然科学版,2015,37(12):162-167.
[9]马爱丽,廖庆喜,田波平,等.基于ANSYS/LS DYNA的螺旋刀具土壤切削的数值模拟[J].华中农业大学学报,2009,28(2):248-252.
[10]齐龙,张岩,梁仲维,等.基于ANSYS/LS-DYNA的松土刀切削土壤有限元仿真[J].农机化研究,2015,37(7):48-52.
[11]王荣,王宏宇,金镜,等.基于ANSYS的大耕深旋耕刀结构优化设计[J].农机化研究,2015,37(5):136-139.
[12]杨望,路宏,杨坚,等.微耕机水田旋耕刀片切土作业过程动力学仿真[J].农机化研究,2016,38(6):74-77.
[13]朱留宪,杨玲,朱超,等.基于SPH算法的微耕机旋耕切土仿真研究[J].农机化研究,2014,36(6):19-22.
[14]葛云.微型旋耕机主要工作部件的应力仿真与可靠性设计[D].石河子:石河子大学,2005.
[15]朱留宪,杨玲,朱超,等.基于ANSYS Workbench的微耕机旋耕刀有限元分析[J].机械研究与应用,2014(1):88-89.
[16]谢杭佳,李果,王世猛,等.微耕机非作业状态的振动测试及分析[J].农机化研究,2014,36(10):174-177.
[17]王世猛,谢杭佳,李果,等.微耕机变速器的振动特性分析—基于ANSYS Workbench[J].农机化研究,2014,36(10):17-20.
[18]李果,谢杭佳,王世猛,等.面向微耕机减振的扶手模态分析[J].农机化研究,2016,38(5):43-47.
[19]刘彦峰,杨士敏,薛金钢,等.基于MATLAB/Simulink土壤振动切削机理仿真分析[J].建设机械技术与管理,2015(2):102-106.
[20]工业和信息化部.JB/T 10266-2013微型耕耘机[S].北京:机械工业出版社,2013.
[21]夏俊芳,贺小伟,余水生,等.基于ANSYS/LS-DYNA的螺旋刀辊土壤切削有限元模拟[J].农业工程学报,2013(10):34-41.
[22]中国农业机械化科学研究院.农业机械设计手册[K].北京:中国农业科学技术出版社,2007.
[23]成大先.机械设计手册(第12篇)[K].北京:机械工业出版社,2004.
[24]杨有刚,张宏,冯涛,等.土壤浅深松联合松耕机设计和浅松土试验[J].机械工程学报,2012,48(19):163-168.