油菜联合收获机切抛组合式纵轴流脱离装置设计与试验
|
摘要
针对传统油菜联合收获机链耙式输送器输送距离长、且易引起油菜高粗茎秆堵塞的问题,设计了一种切抛组合式纵轴流脱离装置,实现油菜的强制喂入、切断抛送、脱粒分离功能于一体,整机关键部件全部采用液压驱动,可保证其无级调速和运转平稳。通过对茎秆的运动学与动力学分析,确定了喂入辊、切碎滚筒和脱粒滚筒的结构参数与工作参数,以夹带损失率和功耗等为评价指标,开展了切碎滚筒转速、脱粒滚筒转速和脱粒间隙的正交试验。正交试验结果表明:较优参数组合为切碎滚筒转速450 r/min、脱粒滚筒转速450 r/min、脱粒间隙30 mm,此时夹带损失率为0. 415%,脱出物短茎秆质量分数为10. 43%,切碎滚筒和脱粒滚筒总功耗为4. 16 kW,排草口茎秆平均长度134. 8 mm,对应的旋风分离清选系统籽粒总损失率为6. 13%、清洁率为91. 97%。田间试验表明,切抛组合式纵轴流脱离装置能实现物料由割台至脱离装置的均匀连续输送和脱粒分离功能,可满足油菜联合收获机的作业要求。
A combined cutting and throwing longitudinal axial flow threshing and separating device was designed to solve the problems like long transport distance and high probability of blockage in threshing device due to the low adaptability of the chain conveyor to rape with high and thick stems in traditional rape combine harvester. The functions of forced feeding,cutting,throwing,threshing and separating were combined,and the key parts of the rape combine harvester were all hydraulically driven to ensure their stepless speed regulation and smooth operation. The structural and working parameters of feeding roller,cutting cylinder and threshing cylinder were determined based on kinematics and dynamics analysis of stem. The orthogonal experiment of cutting cylinder speed,threshing cylinder speed and threshing clearance were carried out while the entrainment loss ratio and power consumption were used as indexes. The results of orthogonal experiment showed that the optimal parameters were 450 r/min for the cutting cylinder speed,450 r/min for the threshing cylinder speed and 30 mm for the threshing clearance.Under this combination of parameters,the total loss ratio was 0. 415%,the mass percentages of short stems in the threshing outlets was 10. 43%,the total power consumption for cutting cylinder and threshing cylinder was 4. 16 kW and the average length of the stems discharged from the outlet of stems was 134. 8 mm.In addition,the loss ratio and cleaning ratio of cyclone separation cleaning system were 6. 13% and91. 97%,respectively. The field experiment showed that the combined cutting and throwing longitudinal axial flow threshing and separating device could realize the uniform continuous conveying,threshing and separating of materials from the header to the threshing device and it could meet the operation demand of the rape combine harvester.
A combined cutting and throwing longitudinal axial flow threshing and separating device was designed to solve the problems like long transport distance and high probability of blockage in threshing device due to the low adaptability of the chain conveyor to rape with high and thick stems in traditional rape combine harvester. The functions of forced feeding,cutting,throwing,threshing and separating were combined,and the key parts of the rape combine harvester were all hydraulically driven to ensure their stepless speed regulation and smooth operation. The structural and working parameters of feeding roller,cutting cylinder and threshing cylinder were determined based on kinematics and dynamics analysis of stem. The orthogonal experiment of cutting cylinder speed,threshing cylinder speed and threshing clearance were carried out while the entrainment loss ratio and power consumption were used as indexes. The results of orthogonal experiment showed that the optimal parameters were 450 r/min for the cutting cylinder speed,450 r/min for the threshing cylinder speed and 30 mm for the threshing clearance.Under this combination of parameters,the total loss ratio was 0. 415%,the mass percentages of short stems in the threshing outlets was 10. 43%,the total power consumption for cutting cylinder and threshing cylinder was 4. 16 kW and the average length of the stems discharged from the outlet of stems was 134. 8 mm.In addition,the loss ratio and cleaning ratio of cyclone separation cleaning system were 6. 13% and91. 97%,respectively. The field experiment showed that the combined cutting and throwing longitudinal axial flow threshing and separating device could realize the uniform continuous conveying,threshing and separating of materials from the header to the threshing device and it could meet the operation demand of the rape combine harvester.
引文
[1]吴崇友,王积军,廖庆喜,等.油菜生产现状与问题分析[J].中国农机化学报,2017,38(1):124-131.WU Chongyou,WANG Jijun,LIAO Qingxi,et al. Current status and problems of rapeseed production[J]. Journal of Chinese Agricultural Mechanization,2017,38(1):124-131.(in Chinese)
[2]罗海峰,汤楚宙,官春云,等.油菜机械化收获研究进展[J].农机化研究,2015,37(1):1-8.LUO Haifeng,TANG Chuzhou,GUAN Chunyun,et al. Research progress in rapeseed mechanized harvest[J]. Journal of Agricultural Mechanization Research,2015,37(1):1-8.(in Chinese)
[3]罗海峰,汤楚宙,官春云,等.适应机械化收获的田间油菜植株特性研究[J].农业工程学报,2010,26(增刊1):61-66.LUO Haifeng,TANG Chuzhou,GUAN Chunyun,et al. Plant characteristic research on field rape based on mechanized harvesting adaptability[J]. Transactions of the CSAE,2010,26(Supp. 1):61-66.(in Chinese)
[4]王殿忠,陈秀生.大喂入量谷物轴流脱粒装置的发展现状及趋势[J].农业技术与装备,2017(6):81-84.WANG Dianzhong,CHEN Xiusheng. Development status and trend of large feed grain axial threshing equipment[J].Agricultural Technology&Equipment,2017(6):81-84.(in Chinese)
[5]黄小毛,宗望远.油菜联合收获的研究现状及发展趋势[J].农业工程,2012,2(1):14-19.HUANG Xiaomao,ZONG Wangyuan. Research status and development trend of rape combine harvester[J]. Agricultural Engineering,2012,2(1):14-19.(in Chinese)
[6]王刚,关卓怀,沐森林,等.油菜联合收获机种子籽粒脱粒装置结构及运行参数优化[J].农业工程学报,2017,33(24):52-57.WANG Gang,GUAN Zhuohuai,MU Senlin,et al. Optimization of operating parameter and structure for seed thresher device for rape combine harvester[J]. Transactions of the CSAE,2017,33(24):52-57.(in Chinese)
[7] TADO C J M,WACKER P,KUTZBACH H D,et al. Development of stripper harvesters:a review[J]. Journal of Agricultural Engineering Research,1998,71(2):103-112.
[8] MIU P I,KUTZBACH H D. Mathematical model of material kinematics in an axial threshing unit[J]. Computers and Electronics in Agriculture,2007,58(2):93-99.
[9]李耀明,周伟,徐立章,等.单切双横流脱粒分离装置参数试验与优化[J/OL].农业机械学报,2015,46(5):62-67,92.LI Yaoming,ZHOU Wei,XU Lizhang,et al. Parameter test and optimization of tangential-horizontal-horizontal threshing and separating device[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(5):62-67,92. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20150510&journal_id=jcsam. DOI:10. 6041/j.issn. 1000-1298. 2015. 05. 010.(in Chinese)
[10]李耀明,孙韬,徐立章.油菜多滚筒脱粒分离装置的性能试验与分析[J].农业工程学报,2013,29(8):36-43.LI Yaoming,SUN Tao,XU Lizhang. Performance test and analysis of rape multi cylinder threshing and separating device[J].Transactions of the CSAE,2013,29(8):36-43.(in Chinese)
[11]黄鹏,廖庆喜,宗望远,等.油菜联合收获机不同脱粒元件对脱离性能的影响试验[J/OL].农业机械学报,2013,44(增刊2):47-51.HUANG Peng,LIAO Qingxi,ZONG Wangyuan,et al. Effect of different threshing elements on threshing and separating performance for rape combine harvester[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(Supp. 2):47-51. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=2013s210&journal_id=jcsam. DOI:10. 6041/j. issn. 1000-1298. 2013. s2. 010.(in Chinese)
[12]唐忠,李耀明,徐立章,等.切纵流联合收获机小麦脱粒分离性能评价与试验[J].农业工程学报,2012,28(3):14-19.TANG Zhong,LI Yaoming,XU Lizhang,et al. Experiment and evaluating indicators of wheat threshing and separating on testbed of longitudinal axial-threshing unit[J]. Transactions of the CSAE,2012,28(3):14-19.(in Chinese)
[13]唐忠,李耀明,徐立章,等.不同脱粒元件对切流与纵轴流水稻脱粒分离性能的影响[J].农业工程学报,2011,27(3):93-97.TANG Zhong,LI Yaoming,XU Lizhang,et al. Effects of different threshing components on grain threshing and separating by tangential-axial test device[J]. Transactions of the CSAE,2011,27(3):93-97.(in Chinese)
[14]金小亮,朱晓星,金诚谦,等.谷物脱粒滚筒的功耗模型研究[J].中国农机化学报,2015,36(3):30-33,38.JIN Xiaoliang,ZHU Xiaoxing,JIN Chengqian,et al. Research on the power consumption model of grain threshing cylinder[J]. Journal of Chinese Agricultural Mechanization,2015,36(3):30-33,38.(in Chinese)
[15]任述光,谢方平,罗锡文,等.柔性齿与刚性齿脱粒水稻功耗比较分析与试验[J].农业工程学报,2013,29(5):12-18.REN Shuguang,XIE Fangping,LUO Xiwen,et al. Analysis and test of power consumption in paddy threshing using flexible and rigid teeth[J]. Transactions of the CSAE,2013,29(5):12-18.(in Chinese)
[16]李耀明,唐忠,徐立章,等.纵轴流脱粒分离装置功耗分析与试验[J].农业机械学报,2011,42(6):93-97.LI Yaoming,TANG Zhong,XU Lizhang,et al. Power analysis and experiment on longitudinal axial-threshing unit test-bed[J].Transactions of the Chinese Society for Agricultural Machinery,2011,42(6):93-97.(in Chinese)
[17]宁小波,陈进,李耀明,等.联合收获机脱粒系统动力学模型及调速控制仿真与试验[J].农业工程学报,2015,31(21):25-34.NING Xiaobo,CHEN Jin,LI Yaoming,et al. Kinetic model of combine harvester threshing system and simulation and experiment of speed control[J]. Transactions of the CSAE,2015,31(21):25-34.(in Chinese)
[18]宗望远,廖庆喜,黄鹏,等.组合式油菜脱粒装置设计与物料运动轨迹分析[J/OL].农业机械学报,2013,44(增刊2):41-46.ZONG Wangyuan,LIAO Qingxi,HUANG Peng,et al. Design of combined rape threshing device and analysis of rape cane movement trail[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(Supp. 2):41-46. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=2013s209&journal_id=jcsam. DOI:10. 6041/j.issn. 1000-1298. 2013. S2. 009.(in Chinese)
[19]姜楠,衣淑娟,张延河.钉齿式轴流装置脱粒过程高速摄像分析[J].农业机械学报,2011,42(增刊):52-56.JIANG Nan,YI Shujuan,ZHANG Yanhe. High-speed photography analysis of threshing process on axial flow device with nails teeth[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(Supp.):52-56.(in Chinese)
[20]徐立章,李耀明,唐忠,等. 4LQZ-6型切纵流联合收获机[J/OL].农业机械学报,2013,44(8):94-98,111.XU Lizhang,LI Yaoming,TANG Zhong,et al. 4LQZ-6 tangential-longitudinal axial combine harvester[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(8):94-98,111. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20130817&journal_id=jcsam. DOI:10. 6041/j. issn. 1000-1298. 2013. 08. 017.(in Chinese)
[21]徐立章,李耀明,王成红,等.切纵流双滚筒联合收获机脱粒分离装置[J/OL].农业机械学报,2014,45(2):105-108.XU Lizhang,LI Yaoming,WANG Chenghong,et al. A combinational threshing and separating unit of combine harvester with atransverse tangential cylinder and an axial rotor[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(2):105-108. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20140218&journal_id=jcsam. DOI:10. 6041/j. issn. 1000-1298. 2014. 02. 018.(in Chinese)
[22]梁苏宁,金诚谦,张奋飞,等. 4LZG-3. 0型谷子联合收获机的设计与试验[J].农业工程学报,2015,31(12):31-38.LIANG Suning,JIN Chengqian,ZHANG Fenfei,et al. Design and experiment of 4LZG-3. 0 millet combine harvester[J].Transactions of the CSAE,2015,31(12):31-38.(in Chinese)
[23]李耀明,陈洋,徐立章,等.斜置切纵流联合收获机脱粒分离装置结构参数优化[J/OL].农业机械学报,2016,47(9):56-61.LI Yaoming,CHEN Yang,XU Lizhang,et al. Optimization of structural parameters for threshing and separating device in obliquetangential-longitudinal combine[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(9):56-61. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20160909&journal_id=jcsam.DOI:10. 6041/j. issn. 1000-1298. 2016. 09. 009.(in Chinese)
[24]中国农业机械化科学研究院.农业机械设计手册:下册[M].北京:中国农业科学技术出版社,2007.
[25]翟之平,吴雅梅,王春光.物料沿抛送叶片的运动仿真与高速摄像分析[J].农业工程学报,2012,28(2):23-28.ZHAI Zhiping,WU Yamei,WANG Chunguang. Dynamic simulation and high-speed camera analysis on materials moving along throwing impellers[J]. Transactions of the CSAE,2012,28(2):23-28.(in Chinese)
[26]杨方飞,阎楚良.谷物在纵向轴流滚筒脱粒空间中的运动状态分析[J].农业机械学报,2008,39(11):48-50,25.YANG Fangfei,YAN Chuliang. Movement analysis of cereal in axial flow threshing roller space[J]. Transactions of the Chinese Society for Agricultural Machinery,2008,39(11):48-50,25.(in Chinese)
[2]罗海峰,汤楚宙,官春云,等.油菜机械化收获研究进展[J].农机化研究,2015,37(1):1-8.LUO Haifeng,TANG Chuzhou,GUAN Chunyun,et al. Research progress in rapeseed mechanized harvest[J]. Journal of Agricultural Mechanization Research,2015,37(1):1-8.(in Chinese)
[3]罗海峰,汤楚宙,官春云,等.适应机械化收获的田间油菜植株特性研究[J].农业工程学报,2010,26(增刊1):61-66.LUO Haifeng,TANG Chuzhou,GUAN Chunyun,et al. Plant characteristic research on field rape based on mechanized harvesting adaptability[J]. Transactions of the CSAE,2010,26(Supp. 1):61-66.(in Chinese)
[4]王殿忠,陈秀生.大喂入量谷物轴流脱粒装置的发展现状及趋势[J].农业技术与装备,2017(6):81-84.WANG Dianzhong,CHEN Xiusheng. Development status and trend of large feed grain axial threshing equipment[J].Agricultural Technology&Equipment,2017(6):81-84.(in Chinese)
[5]黄小毛,宗望远.油菜联合收获的研究现状及发展趋势[J].农业工程,2012,2(1):14-19.HUANG Xiaomao,ZONG Wangyuan. Research status and development trend of rape combine harvester[J]. Agricultural Engineering,2012,2(1):14-19.(in Chinese)
[6]王刚,关卓怀,沐森林,等.油菜联合收获机种子籽粒脱粒装置结构及运行参数优化[J].农业工程学报,2017,33(24):52-57.WANG Gang,GUAN Zhuohuai,MU Senlin,et al. Optimization of operating parameter and structure for seed thresher device for rape combine harvester[J]. Transactions of the CSAE,2017,33(24):52-57.(in Chinese)
[7] TADO C J M,WACKER P,KUTZBACH H D,et al. Development of stripper harvesters:a review[J]. Journal of Agricultural Engineering Research,1998,71(2):103-112.
[8] MIU P I,KUTZBACH H D. Mathematical model of material kinematics in an axial threshing unit[J]. Computers and Electronics in Agriculture,2007,58(2):93-99.
[9]李耀明,周伟,徐立章,等.单切双横流脱粒分离装置参数试验与优化[J/OL].农业机械学报,2015,46(5):62-67,92.LI Yaoming,ZHOU Wei,XU Lizhang,et al. Parameter test and optimization of tangential-horizontal-horizontal threshing and separating device[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(5):62-67,92. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20150510&journal_id=jcsam. DOI:10. 6041/j.issn. 1000-1298. 2015. 05. 010.(in Chinese)
[10]李耀明,孙韬,徐立章.油菜多滚筒脱粒分离装置的性能试验与分析[J].农业工程学报,2013,29(8):36-43.LI Yaoming,SUN Tao,XU Lizhang. Performance test and analysis of rape multi cylinder threshing and separating device[J].Transactions of the CSAE,2013,29(8):36-43.(in Chinese)
[11]黄鹏,廖庆喜,宗望远,等.油菜联合收获机不同脱粒元件对脱离性能的影响试验[J/OL].农业机械学报,2013,44(增刊2):47-51.HUANG Peng,LIAO Qingxi,ZONG Wangyuan,et al. Effect of different threshing elements on threshing and separating performance for rape combine harvester[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(Supp. 2):47-51. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=2013s210&journal_id=jcsam. DOI:10. 6041/j. issn. 1000-1298. 2013. s2. 010.(in Chinese)
[12]唐忠,李耀明,徐立章,等.切纵流联合收获机小麦脱粒分离性能评价与试验[J].农业工程学报,2012,28(3):14-19.TANG Zhong,LI Yaoming,XU Lizhang,et al. Experiment and evaluating indicators of wheat threshing and separating on testbed of longitudinal axial-threshing unit[J]. Transactions of the CSAE,2012,28(3):14-19.(in Chinese)
[13]唐忠,李耀明,徐立章,等.不同脱粒元件对切流与纵轴流水稻脱粒分离性能的影响[J].农业工程学报,2011,27(3):93-97.TANG Zhong,LI Yaoming,XU Lizhang,et al. Effects of different threshing components on grain threshing and separating by tangential-axial test device[J]. Transactions of the CSAE,2011,27(3):93-97.(in Chinese)
[14]金小亮,朱晓星,金诚谦,等.谷物脱粒滚筒的功耗模型研究[J].中国农机化学报,2015,36(3):30-33,38.JIN Xiaoliang,ZHU Xiaoxing,JIN Chengqian,et al. Research on the power consumption model of grain threshing cylinder[J]. Journal of Chinese Agricultural Mechanization,2015,36(3):30-33,38.(in Chinese)
[15]任述光,谢方平,罗锡文,等.柔性齿与刚性齿脱粒水稻功耗比较分析与试验[J].农业工程学报,2013,29(5):12-18.REN Shuguang,XIE Fangping,LUO Xiwen,et al. Analysis and test of power consumption in paddy threshing using flexible and rigid teeth[J]. Transactions of the CSAE,2013,29(5):12-18.(in Chinese)
[16]李耀明,唐忠,徐立章,等.纵轴流脱粒分离装置功耗分析与试验[J].农业机械学报,2011,42(6):93-97.LI Yaoming,TANG Zhong,XU Lizhang,et al. Power analysis and experiment on longitudinal axial-threshing unit test-bed[J].Transactions of the Chinese Society for Agricultural Machinery,2011,42(6):93-97.(in Chinese)
[17]宁小波,陈进,李耀明,等.联合收获机脱粒系统动力学模型及调速控制仿真与试验[J].农业工程学报,2015,31(21):25-34.NING Xiaobo,CHEN Jin,LI Yaoming,et al. Kinetic model of combine harvester threshing system and simulation and experiment of speed control[J]. Transactions of the CSAE,2015,31(21):25-34.(in Chinese)
[18]宗望远,廖庆喜,黄鹏,等.组合式油菜脱粒装置设计与物料运动轨迹分析[J/OL].农业机械学报,2013,44(增刊2):41-46.ZONG Wangyuan,LIAO Qingxi,HUANG Peng,et al. Design of combined rape threshing device and analysis of rape cane movement trail[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(Supp. 2):41-46. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=2013s209&journal_id=jcsam. DOI:10. 6041/j.issn. 1000-1298. 2013. S2. 009.(in Chinese)
[19]姜楠,衣淑娟,张延河.钉齿式轴流装置脱粒过程高速摄像分析[J].农业机械学报,2011,42(增刊):52-56.JIANG Nan,YI Shujuan,ZHANG Yanhe. High-speed photography analysis of threshing process on axial flow device with nails teeth[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(Supp.):52-56.(in Chinese)
[20]徐立章,李耀明,唐忠,等. 4LQZ-6型切纵流联合收获机[J/OL].农业机械学报,2013,44(8):94-98,111.XU Lizhang,LI Yaoming,TANG Zhong,et al. 4LQZ-6 tangential-longitudinal axial combine harvester[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(8):94-98,111. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20130817&journal_id=jcsam. DOI:10. 6041/j. issn. 1000-1298. 2013. 08. 017.(in Chinese)
[21]徐立章,李耀明,王成红,等.切纵流双滚筒联合收获机脱粒分离装置[J/OL].农业机械学报,2014,45(2):105-108.XU Lizhang,LI Yaoming,WANG Chenghong,et al. A combinational threshing and separating unit of combine harvester with atransverse tangential cylinder and an axial rotor[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(2):105-108. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20140218&journal_id=jcsam. DOI:10. 6041/j. issn. 1000-1298. 2014. 02. 018.(in Chinese)
[22]梁苏宁,金诚谦,张奋飞,等. 4LZG-3. 0型谷子联合收获机的设计与试验[J].农业工程学报,2015,31(12):31-38.LIANG Suning,JIN Chengqian,ZHANG Fenfei,et al. Design and experiment of 4LZG-3. 0 millet combine harvester[J].Transactions of the CSAE,2015,31(12):31-38.(in Chinese)
[23]李耀明,陈洋,徐立章,等.斜置切纵流联合收获机脱粒分离装置结构参数优化[J/OL].农业机械学报,2016,47(9):56-61.LI Yaoming,CHEN Yang,XU Lizhang,et al. Optimization of structural parameters for threshing and separating device in obliquetangential-longitudinal combine[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(9):56-61. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20160909&journal_id=jcsam.DOI:10. 6041/j. issn. 1000-1298. 2016. 09. 009.(in Chinese)
[24]中国农业机械化科学研究院.农业机械设计手册:下册[M].北京:中国农业科学技术出版社,2007.
[25]翟之平,吴雅梅,王春光.物料沿抛送叶片的运动仿真与高速摄像分析[J].农业工程学报,2012,28(2):23-28.ZHAI Zhiping,WU Yamei,WANG Chunguang. Dynamic simulation and high-speed camera analysis on materials moving along throwing impellers[J]. Transactions of the CSAE,2012,28(2):23-28.(in Chinese)
[26]杨方飞,阎楚良.谷物在纵向轴流滚筒脱粒空间中的运动状态分析[J].农业机械学报,2008,39(11):48-50,25.YANG Fangfei,YAN Chuliang. Movement analysis of cereal in axial flow threshing roller space[J]. Transactions of the Chinese Society for Agricultural Machinery,2008,39(11):48-50,25.(in Chinese)