Development Of Batch Transportation And Sorting For Maize Grains In Directional Sowing

The topic of the thesis was derived from the National Natural Science Foundation of China(Project Number: 51405078),the China Postdoctoral Science Foundation(Project No.2014M561318),and the Special Research Fund for Higher Education Doctoral Program(Project No.20132325120007).The aim is to achieve grain oriented alignment and batch transport and precise sorting by optimizing test device of batch transport and sorting for maize grains in directional sowing.This paper regards device of batch transport and sorting for maize grains in directional sowing as its research object.Optimum design of oriented alignment batch transport and sorting test device for maize grains.By exploring the mechanism of grain oriented alignment and optimizing design system operating parameters,Achieve the goal of batch sorting of grains that meet the requirements of directional sowing.The test device consists of an oriented alignment system,a batch transport system,and a sorting system.The function of this test device is designed according to the requirements of maize grains directional sowing.In order to achieve large-scale mechanized maize grains directional sowing,an oriented alignment system based on electromagnetic vibration is designed.In order to increase the efficiency of directional sowing operations,a batch transport system for maize grains is designed.In order to sort high quality maize grains that meet the directional sowing conditions,and combining self-developed visual online sorting software for maize grains,designed a sheet type sorting system.Based on the above mentioned study,the main tasks are as follows:(1)As the research object that five varieties of corn kernels,Zhongke 11,shengyu 18,Limin 33,Dongdan 80 and Zhengdan 958,and measured the 1000-grain weight,density,and moisture content;the static friction coefficient was measured by a self-made test stand for corn grain and rubber board.It provides a theoretical basis for the establishment of a follow-up model.(2)TRIZ theory based power mode innovation design.According to the problems in the process of maize grains batching and sorting,optimize the power mode of the device and analyze the problem,the best solution to determine the power mode of the device,provides the basis for optimizing the design of the device’s operating parameters.(3)Construction and optimization of oriented alignment experiment platform for maize grains.First,by analyzing the principle of electromagnetic vibration,the slip model of maize grains is constructed;Secondly,the system dynamics analysis and the force analysis of maize grains during the oriented alignment stage are carried out,to explore the relationship between maize grains oriented alignment and electromagnetic vibration system design parameters,select and remove parameters that have a significant effect on the operating performance of the electromagnetic vibration system,get critical condition of design parameters that meet the requirements;Finally,building an oriented alignment testing platform,through a three-factor quadratic orthogonal rotation design test,and further optimize design parameters.The optimal design parameter range was optimized and calculated,and the system was put into the optimal parameter combination for verification test.(4)Design and construction of batch transportation test platform for maize grains.In the above range of optimal parameter combinations for electromagnetic vibration systems that are suitable for maize grains oriented alignment,and further optimize the test platform suitable for batch transport for maize grains.Designing a mechanical device capable of efficient batch transport based on the TRIZ theory,explained the main structure of the device,working principle and related structural parameters;The structural design of the key components of the device("S"-shaped curved track,wedge-shaped flow divider),analyze the performance characteristics of batch transport orbits;The EDEM virtual simulation orthogonal test of the batch transport performance of the device,analyze the impact of relevant factors on the performance of batch transport,and get a reasonable combination of parameters,bench test verification shows that: batch transport performance is good and meets the requirements of maize grains sorting performance.(5)SVM-based batch online sorting software system for maize grains.Comprehensive use of computer,mathematics,pattern recognition,mathematical morphology,digital image processing and other theoretical knowledge,and get pictures of maize grains in a live video stream,preproce-ssing grains photos,complete maize grains acquisition,segmentation and positioning,extract the size feature parameters and shape feature parameters of the front view of the maize grains,provide the necessary raw data for the online batch sorting software system for maize grains,at the same time,it combines pattern recognition with support vector machine(SVM)classifiers.Based on the above content,designing a GUI interface of batch online sorting software for maize grains.(6)Design and construction of maize grains sorting test platform.In order to achieve the ultimate goal of sorting quality maize grains,based on the above structure of oriented alignment and batch transport test platform,according to the overall layout and functional requirements of the design of the key components of the sorting system,to optimize it’s structure,developed experimental prototypes with adjustable mechanism parameters.benching verification test under the above parameters,verifying that the device has good sorting performance.The research shows that the batch transport and sorting for maize grains in directional sowing can effectively solve the problem of maize grains oriented alignment,batch transport and rapid sorting.It avoids the effects of labor intensity,slow sorting speed,lack of uniform standards caused by human factors such as artificial seed selection,achieved automated and intelligent machinery sorting,it provides theoretical support for the study of ordered wholesaling and attitude control of granular materials targeted for directional planting,provided technical support for the study of batch sorting of corn kernels,optimal design parameters range vibrating direction angle of 32°-35°,amplitude is 0.1-0.15 mm,the vibration frequency is 51.5-52 Hz,corresponding to the test index oriented success rate is in the range of 63.8%-67.4%,the success rate of whole range of 95.8%-96.3%.Obtained reasonable parameter combination: the track width of 15.4 mm,track arc central angle of 45°,wedge the baffle angle is 110°,and the bench test is carried out,the bench test results show that the electromagnetic vibration amplitude is 1.5mm,frequency is 52 Hz,the vibration direction angle of 28°,the installation angle is 0°,the added mass is 0.3 kg,one side of a plate spring to 87°,the other side plate spring to 35 °,the amplitude of the with the added mass is 1 mm,the batch transportation qualified index is 83.1%,adhesion and retention index is 10.4%,hysteresis index is 6.5%.It’s good for the batch transportation performance,and meet the maize grains sorting system performance requirements.To test the bulk online sorting software system for corn kernels,accuracy of classification results up to 98.33%.Under the premise that the visual system is correctly identified,that is not included the visual system misidentification,the average sorting success rate is 95.7%.