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Design and test of an inside-filling pneumatic precision centralized seed-metering device for rapeseed

International Journal of Agricultural and Biological Engineering 2017年第2期10卷 56-62页

作者： liao Yitao Wang Lei liao qingxi Engineering College Huazhong Agricultural UniversityWuhan 430070China

The pneumatic precision seed-metering devices used in combination with negative air pressure to suck seed and positive air flow to drop seed could overcome the problem of rapeseed precision ***,these devices can only plant a single row at a time or need high airflow pressure,which complicates the seed-metering system and the seeder structure,deteriorate the working reliability and have high power *** overcome above shortcomings,a novel prototype of pneumatic precision centralized seed-metering device with seed inside-filling,sowing six rows at a time,was *** main structure and working principle of the prototype were described and the technical parameters were *** were conducted to investigate the influences of positive pressure,negative pressure,and rotating speed on the seeding *** stability of each row and the consistency between all rows associated with the seeding precision were analyzed to evaluate the performance of the *** results indicated that the prototype can meet the requirements of precision seeding and the seed keep intact without any obvious *** performance of the prototype was no significant difference when the positive pressure was fluctuated from 200 Pa to 1200 *** best seeding precision parameters in one row of the prototype was 92.48%of the qualified seeding index(Iqs)and 2.55%of the miss-seeding index(Imiss),when the rotating speed was 16 r/min,the positive pressure was 200 Pa and the negative pressure was–1600 *** the rotating speed was 16 r/min,the positive pressure was 200 Pa,and the negative pressure was–1400 Pa or–1600 Pa,the Iqs of six rows were above 86.5%,the stability coefficient of variation(CV)of each row were below 4.6%,and the consistency CV were below 0.9%.Further field experiment showed that the rapeseed sowed by the prototype had acceptable seeding *** CV of the numbers of rapeseed seedlings in the field of the total and each row were 6.

关键词： centralized seed-metering device seed inside-filling pneumatic precision sowing rapeseed

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Simulation analysis and match experiment on negative and positive pressures of pneumatic precision metering device for rapeseed

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International Journal of Agricultural and Biological Engineering 2014年第3期7卷 1-12页

作者： Yu Jiajia liao Yitao Cong Jinling Yang Song liao qingxi College of Engineering Huazhong Agricultural UniversityWuhan 430070China

Positive and negative pressures determine the performance of pneumatic precision metering device for *** order to investigate the relationship between positive and negative pressures of nozzles,fluid models of chamber were developed to simulate the airflow,and the k-εturbulence model was conducted to capture the pressure and velocity of *** these efforts linear models were ***,the three-factor factorial split-split experiment was designed with negative pressure,positive pressure and the rotating speeds varying from-1000 to-4500 Pa,50 to 250 Pa and 10 to 45 r/min,*** mathematical models were developed through employing the stepwise regression *** sequence of influential factors on the quality of feed index was positive pressure,negative pressure and rotating *** obtain the match regulation of negative and positive pressures with“good”performance,the ratio coefficient K of negative and positive pressures was introduced to build mathematical *** relating ratio coefficient K with positive pressure were fitted in different rotating *** results showed that the ratio coefficient was matchedГ∈[f1(x),f2(x)]from the fitting equations with the rotating speed of 10-30 r/min;while the rotating speed has greater influence when it was 35-40 r/min and the setsΛ∈[g1(x),g2(x)]were achieved,where x∈[100,250].This study could be conducted to adjust the rotating speed of the pneumatic system to optimize the ideal performance of the seeder.

关键词： precision metering device pneumatic device simulation positive and negative pressures stepwise regression fitting rapeseed

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Effects of working parameters on the performance of cyclone separator for rapeseed combine harvester based on CFD

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International Journal of Agricultural and Biological Engineering 2023年第1期16卷 128-135,F0004页

作者： Xingyu Wan Jiacheng Yuan Jia Yang Yitao liao qingxi liao College of Engineering Huazhong Agricultural UniversityWuhan 430070China Key Laboratory of Agricultural Equipment in Mid-lower Reaches of the Yangtze River Ministry of Agriculture and Rural AffairsWuhan 430070China

Existing development for cyclone separation cleaning components of the rapeseed combine harvester,which employs the suspending airflow to separate the rapeseeds from the materials other than grain(MOG),has the challenge to figure out the optimal working parameters,highlighting a need for exploration of the invisible airflow based on Computational Fluid Dynamics(CFD).The airflow status was mainly affected by the air velocities of the inlet,and the outlet for the *** single factor and response surface experiments were carried *** could be found that the inlet and MOG outlet velocities affected the air velocities through the change in the air ***,the mathematical model of the relationship between the air velocities inside the cyclone and the working parameters was built,and the optimal combination of working parameters was obtained by multi-objective *** inlet and outlet velocities of the optimal combination were 4.25 m/s and 29.87 m/s,*** this condition,the cleaning ratio and loss ratio of the cleaning device was 94.62%and 5.39%,respectively,as validated by the field *** findings provide references for the improvement of cleaning systems for rapeseed combine harvesters.

关键词： rapeseed combine harvester cyclone separation cleaning optimal working parameters CFD

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Effect of soil surface roughness on emergence rate and yield of mechanized direct-seeded rapeseed based on 3D laser scanning

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International Journal of Agricultural and Biological Engineering 2023年第3期16卷 110-119页

作者： Hui Chen Liping Gao Mengcheng Li Yitao liao qingxi liao School of Energy and Power Engineering Xihua UniversityChengdu 610039China College of Engineering Huazhong Agricultural UniversityWuhan 430070China

The quality of seedbed after sowing such as soil surface roughness is one of the key factors affecting the seedling emergence of rapeseed,which ultimately affected crop ***,the effect of soil surface roughness on seedling emergence and yield of rapeseed is still *** this study,field experiments at the experimental site of Jianli and Shayang were carried *** treatments were designed:relative slow(M1),medium(M2),and fast(M3)forward speed of the *** surface roughness measured by a 3D laser scanner,seed quantity of the seeder,emergence rate and yield of rapeseed were determined to investigate the soil surface roughness effect on emergence rate and yield of *** results showed that as the forward speed of the unit increased,the compartment surface became *** with the M1 and M2 treatments,soil surface roughness under the M3 treatment increased by 36.5%and 9.8%,*** actual seed quantity of the seeder under different treatments ranged from 3806.56 to 4158.18 g/*** average error rate of the actual and theoretical seed quantity was less than 5%,which met the operational quality requirements for seeding rapeseed *** the forward speed of the unit increased,the actual seed quantity of the seeder gradually increased while the emergence rate and yield of rapeseed *** seed quantity under the M3 treatment increased by 6.9%and 4.7%,while the emergence rate of rapeseed decreased by 3.3%and 2.0%,and the yield decreased by 23.2%and 13.1%,compared with the M1 and M2 treatments,*** analysis indicated that emergence rate and yield of rapeseed were negatively influenced by soil surface *** rapeseed emergence rate,seed yield,and economic benefits,the M1 treatment was *** considering the factor that the M1 treatment may reduce the unit operation efficiency,and thus resulting in lower cost of production,M2 could be recommended in actual *** results of this

关键词： mechanized direct-seeder soil surface roughness rapeseed seed emergence rate yield

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Design and experiment of multi-row pneumatic precision metering device for rapeseed

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International Journal of Agricultural and Biological Engineering 2018年第5期11卷 116-123页

作者： Elebaid Jabir Ibrahim qingxi liao Lei Wang Yitao liao Lu Yao College of Engineering Huazhong Agricultural UniversityWuhanHubei 430070China

The main objective of this study was to design a pneumatic disk with four-rows for planting rapeseed and to investigate its performance under several rotating speeds and vacuum pressure *** effects of rotating speeds,vacuum pressure and rows on seed sucking and retaining were *** rotating speeds(5 r/min,10 r/min,15 r/min,20 r/min,25 r/min and 30 r/min)incorporated with the application of vacuum pressure were employed for detecting the optimum vacuum amount that was sufficient for seed sucking under each *** values of vacuum were found to be 1.1 kPa,1.25 kPa,1.35 kPa,1.65 kPa,1.8 kPa and 2.0 kPa,***,a regression model was developed for predicting of vacuum pressure that corresponds with each rotating *** on seed mass analysis,statistical differences were found at 5%significance under the influence of speeds and negative pressure and existed also between and within rows according to Duncan’s *** highest seed mass means of 3.17 g and 3.96 g were obtained by row 1 under the effects of speed and vacuum pressure,respectively,while the lowest means of 2.79 g and 3.05 g were attained by row *** to the influence of rows,important differences were occurred between row 1(closer to the center of rotation)and row 4(farther one),particularly under high speeds(25 r/min and 30 r/min).Results concluded that,pneumatic disk with multiple-rows could be satisfactorily used for seed sowing with a little variation in seed amount between rows without any seed *** rows of hole farther from plate center of rotation were obviously influenced by angular velocity and vacuum amount rather than the closer ones.

关键词： precision seeder metering device performance pneumatic disk multi-rows rapeseed

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Parameter matching and experiment of the combined cyclone separation and cylinder sieve cleaning system for rape combine harvester

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 128-136页

作者： Jiacheng Yuan qingxi liao Xingyu Wan Jia Yang Caixia Shu College of Engineering Huazhong Agricultural UniversityWuhan 430070China Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River Ministry of Agriculture and Rural AffairsWuhan 430070China

Existing rape combine harvester with a cyclone separation cleaning device has the challenge that the loss rate and the cleaning rate increase and decrease simultaneously.A cleaning process route was proposed,which involves the cyclone separation cleaning device removing light and tiny impurities,and the cylinder sieve device removing coarse and long impurities such as pod shells and short stems.A novel cleaning system combining the cyclone separation cleaning device and cylinder sieve cleaning devices was *** ranges of the structure and operation parameters for each component were analyzed based on kinematics and dynamic analysis.A four-factor five-level quadratic orthogonal test was carried out,in which the loss rate and cleaning rate were taken as the evaluation *** velocity at the suction port,the rotation speed of the cylinder sieve,the screw pitch of the spiral blade and the diameter of the sieve hole were taken as the influencing *** orthogonal test results showed that the cleaning system performed best at a rotation speed of the winnower is 600 r/min,an airflow velocity at the suction port is 18.25 m/s,a rotation speed of the cylinder sieve is 87 r/min,a screw pitch of the spiral blade is 440 mm and a diameter of the sieve hole is 4.48 *** this time,the loss rate of the cleaning system is 3.22%,and the cleaning rate is 95.67%.Compared to the conventional cyclone separation cleaning device,the loss rate is reduced by 2.17%and the cleaning rate is increased by 1.05%.This study can provide a reference for the optimal cleaning system design for rape combine harvesters.

关键词： agricultural engineering cleaning system cyclone separation cylinder sieve rapeseed combine harvester

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Design and experiment of the pneumatic cylinder type precision metering system for wheat

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International Journal of Agricultural and Biological Engineering 2023年第5期16卷 88-94页

作者： Anas Dafaallah Abdallah qingxi liao Elebaid Jabir Ibrahim Lei Wang College of Engineering Huazhong Agricultural UniversityWuhan 430070China Department of Agricultural Engineering Faculty of Agricultural ScienceUniversity of GeziraWad MedaniP.O.Box 20Republic of Sudan

The main goal of this study was to design a pneumatic cylindrical-type metering device with six-rows for wheat precision and to analyze its output under different rotating speeds and vacuum pressure *** effect of the pressure,rotating speed and rows on seed suction,retention and dropping was shown *** levels of rotating speed(5,10,15,20,25 and 30 r/min.)combined with the applying of different vacuum pressures(1.8,2.1,2.4,2.7,3.0,and 3.3 kPa)were inspected to detect the optimum pressure which was adequate for seed sucking at each *** addition,to predict the vacuum pressure corresponding with each rotating speed,a regression model was *** on seed mass analysis,statistical differences under the influence of velocities and negative pressure were found at 5 percent significance according to Duncan’s Test,whereas the differences were existed between and within *** revealed that the highest seed mass means of 19.02 g and 22.64 g were obtained by row1while the lowest means of 18.02 g and 21.49 g were attained by row6 under the effect of the speed and vacuum pressure,*** noticeable variation between row1 and row 6,particularly under high speeds(25 and 30 r/min),might be returned to the truth that row 1 was closer to vacuum inlet,and row 6 was the farthest *** concluded that the multiple-row pneumatic cylinder with oblong shape seed nozzle was found to be capable for single seed picking with a small rows variation but without seed damage.

关键词： Multi-rows cylinder pneumatic metering device wheat precision

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Experimental research on physical and mechanical parameters of matured bottom stalk of the reed for harvester design

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International Journal of Agricultural and Biological Engineering 2011年第2期4卷 36-42页

作者： Cao Zhen Jin Xin liao qingxi College of Engineering Huazhong Agricultural UniversityWuhan 430070China

The compressing,stretching,bending,and shearing stress of reed stalk growing in the Yangtze River region were investigated by using a computer-controlled electronic universal testing *** results were as follows:the average maximum values of the stress resistance intensity,pulling resistance intensity,the average of maximum bending resistance intensity,and shearing resistance intensity were 22 MPa,152 MPa,118 MPa and 26 MPa,respectively,whereas the equivalent values of the modulus of elasticity were 45 MPa,321 MPa,77 MPa and 286 MPa,*** stalk of reed is a kind of anisotropic material and it is different from Arundo donax L.,ramie and ***,the traditional agricultural machine for cutting and processing is found to be inconvenient to use in reed *** data of the experiments provided an important foundation for determining the structural parameters of reed cutter.

关键词： reed stalk cutter mechanicalproperties physical properties reedharvester modulus

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Seeding performance of air-assisted centralized seed-metering device for rapeseed

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International Journal of Agricultural and Biological Engineering 2021年第5期14卷 79-87页

作者： Xiaolong Lei Hongji Hu Wenhao Yang Liyang Liu qingxi liao Wanjun Ren College of Mechanical and Electrical Engineering Sichuan Agricultural UniversityYa’an 625014SichuanChina Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province Chengdu 611130China College of Engineering Huazhong Agricultural UniversityWuhan 430070China

In order to analyze seed movement characteristics and improve seeding quality of air-assisted centralized metering device for rapeseed,the effects of the model-hole structure on seed feeding performance were investigated using EDEM ***,the CFD-DEM coupling approach was applied to determine movement trajectories and airflow *** impacts of rapeseed varieties and rotational speed on seeding performance were investigated by bench *** results showed that the seed feeding quantity increased with the increase of model-hole’s length,depth and section *** the model-hole’s depth of 3.0 mm,the type II model-hole and model-hole’s length of 10 mm,both the variation coefficient of seed feeding quantity and hill diameter were lower which meet the seeding quantity requirement of 2 seeds in each *** was revealed that the seed population migrated in a large airflow velocity area and the distribution was *** bench tests indicated that rapeseed varieties and rotational speed had a significant effect on the seed feeding quantity in each hill at rotational speed of 10-40 r/*** variation coefficient of seed feeding quantity in each hill was less than 17.0%for each *** hill diameter,which did not exceed 3.5 cm,tended to reduce with increasing rotational *** variation coefficient of seeding quantity in each row and seeding uniformity was less than 6.5%and 32.0%,*** experiments demonstrated that the seedling was 9-13 plants per meter each row for three rapeseed *** variation coefficient of plants was less than 25.0%for six rows and their yields reached 2761 kg/hm2,which realized the mechanized planting *** results can optimize structure of an air-assisted centralized metering system and improve seeding performance.

关键词： rapeseed air-assisted centralized metering device seed hill feeding seeding performance

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2BFQ-6型油菜精量联合直播机气力式排种系统试验研究

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农业工程学报 2012年第17期28卷 57-62页

作者：杨松廖宜涛廖庆喜华中农业大学工学院武汉430070

为了对2BFQ-6型油菜精量联合直播机气力式排种系统进行研究,该文在气力式油菜精量排种检测系统研制基础上,以排种盘转速、风机转速及正压泄气孔直径为试验因素,进行了320次全因子组合试验,并运用多元非线性回归等数学方法进行试验数据... 详细信息

为了对2BFQ-6型油菜精量联合直播机气力式排种系统进行研究,该文在气力式油菜精量排种检测系统研制基础上,以排种盘转速、风机转速及正压泄气孔直径为试验因素,进行了320次全因子组合试验,并运用多元非线性回归等数学方法进行试验数据分析处理。结果表明:各因素对系统排种效果影响程度主次为风机转速>排种盘转速>正压泄气孔直径,而风机转速及其与排种盘转速的交互作用分别是影响各行排种量及其一致性的首要因子;在一定范围内,随着风机转速的提高和排种盘转速的降低,系统排种性能趋于稳定;而当正压泄气孔直径在20和30mm时,系统具有较好的排种量一致性。所得出的气力式油菜精量排种系统的排种量方程、排种量一致性方程及90%排种率参数组合图,可为直播机参数匹配提供参考,也可对直播机的排种性能进行评估。

关键词：农业机械试验回归分析气力式排种系统油菜

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