| 1 | Preliminary bench experiment study on working parameters of pneumatic seeding mechanism for wheat in rice-wheat rotation areas显示文摘In order to solve the serious problems of soil adhesion and blockage as well as high operating resistance for wheat seeders under the condition of sticky heavy loam clay in rice-wheat rotation area,a new concept of non-contact pneumatic seeding technology that could rip wheat seed into the soil by high pressure accelerating airflow was proposed in this paper.A preliminary bench experiment was conducted and high-speed photography technology was used to study the parameters of wheat pneumatic seeding under five levels(30%,35%,40%,45%and 50%)of soil moisture content for loam clay.Experimental results showed that:wheat seeds could be ripped into soil without damage and acquired varying degrees of germination by way of pneumatic seeding;shooting depth shown a deepening tendency with the increase in shooting velocity,and the value of seeding depth and seeding velocity are closely related to the soil moisture level,which wheat seeds can achieve higher shooting depth with relative lower shooting velocity when the soil moisture content increases continuously;none of wheat seeds could be ripped into the soil with about 2.93 m/s shooting velocity that accelerated in the form of free fall,while the shooting velocity that wheat seeds needed in order to be completely ripped into soil with 3 mm shooting depth were 40-50 m/s(30%soil moisture content),30-40 m/s(35%soil moisture content),20-30 m/s(40%soil moisture content),10-20 m/s(45%soil moisture content)and 2.93-10 m/s(20%soil moisture content),respectively.The experimental results can provide basic data and technical support for the development of non-contact wheat seeding equipment in rice-wheat rotation area. | Chao Wang Caiyun Lu Hongwen Li Jin He Qingjie Wang Xiupei Cheng | 2020 | International Journal of Agricultural and Biological Engineering2020，13，1： | 2 |
| 2 | Optimization of operating parameters of seeding device in plot drill with seeding control system显示文摘Plot drill has a significant impact on field breeding by replacing manual seeding.However,the seeding performance of plot drill needs to be further improved as the mechanical transmission method cannot work under the optimal combination of operating parameters.In this study,a cone compartment tray of sowing device was evaluated under the laboratory conditions,using a self-designed seeding control system to adjust the operating parameters.Among them,a plot seeding control system was involved that could set operating parameters through an Android terminal,which effectively reduced the difficulty of parameters adjustment.The method of central composite experiment design was employed to conduct experiments and explore the effects of experiment factors such as lifting height of storage tube(LHST),rotation speed of cone compartment tray(RSCCT),and rotation speed seed distributor(RSSD)on the seeding uniformity coefficient of variation among rows(SUCVR)and the rate of damaged seeds(RDS).For SUCVR of wheat,the results showed that the importance order of main factors from high to low was RSSD,RSCCT and LHST.And for SUCVR of buckwheat,RSCCT had the largest influence,followed by RSSD,and LHST had the smallest influence.For RDS of wheat and buckwheat,only RSSD had a very significant effect among the main factors.The experiments data of wheat indicated that when operated at 27.2 mm for LHST,4.5 r/min for RSCCT and 1169 r/min for RSSD,the sowing performance of wheat was optimal,with SUCVR and RDS values of 5.02%and 0.117%,respectively.The buckwheat seeding performance was found to be optimal when the LHST,RSCCT and RSSD were 26.5 mm,3.9 r/min and 711 r/min,and SUCVR and RDS were 4.74%and 0.113%.The seeding control system realized the electromechanical control of the seeding equipment,was convenient for parameter setting and stepless adjustment,and could be operated under an optimized combination of operating parameters.The research results could provide a reference for the performance improvement and application of plot drill. | Xiupei Cheng Hongwen Li Jin He Qingjie Wang Caiyun Lu Yingbo Wang Chao Wang Chunlei Wang Shangyi Lou | 2021 | International Journal of Agricultural and Biological Engineering2021，14，3： | 0 |
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