刮板升运带式膜上覆土装置覆土特性.pdf

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1、第52卷第7期2016年4月机械工程学报JOURNAL0FMECHANICALENGINEERINGV01．52N0．7Apr．2016DOI：10．3901／JME．2016．07．038刮板升运带式膜上覆土装置覆孙伟1刘小龙1石林榕1张华1(1．甘肃农业大学工学院兰州2．中国农业大学工学院北京土特性木刘全威2吴建民1730070；100083)摘要：为解决全膜覆土种植模式膜上覆土量不足造成的风力破坏、穴孔错位、烧苗等问题，设计一种适用于全膜覆盖铺膜机的膜上覆土装置，即刮板升运带式膜上覆土装置。对其覆土特性

2、迸行理论分析，建立理论输土量模型，基于EDEM离散单元法对覆土宽度进行模拟试验，借助Design．Expert软件建立覆土宽度的二次回归模型。在此基础上，进行覆土性能田间试验。结果表明：带速与机组前进速度比由1．38增至2．56，覆土量均值减小；刮板高度由40mm增至60nlm，覆土量均值增加，取土、输送效率降低；刮板间距、升运带倾角分别由100mill增至140mill、35。增至55。，覆土量均值减小，取土、输送效率降低。参数限制区间内，最优参数组合为带速与机组前进速度比1．38，刮板高度60mm，刮板间

3、距100irlln，升运带倾角35。；覆土宽度模拟值接近田间测试均值，表明EDEM离散单元法模拟覆土宽度可行。该研究可为刮板升运带式膜上覆土装置的改进及优化提供参考。关键词：刮板升运带；膜上覆土机构：覆土特性中图分类号：s223CoveringSoilonPlastic-filmCharacteristicsofScraperLiftingBeltMechanismSUNWeilLIUXiaolon91SHILinron91ZHANGHualLIUQuanwei2wuJianminl(1．CollegeofE

4、ngineering，GansuAgriculturalUniversity,Lanzhou730070；2．CollegeofEngineering，ChinaAgriculturalUniversity，Beijing100083)Abstract：Inordertosolvenleproblemsthatthevolumeofcoveringsoilisnotenoughcausingwinddamage．cavitydislocationandbumseedlingsinwholeplastic—fi

5、lmmulchingplantingmodel，adevicewhichissuitableforwholeplastic-filmmulchingmachineisdesigned．namelycoveringsoilonplastic-filmmechanismwithscraperliftingbelt．Thecharacteristicsofcoveringsoilareanalyzedintheory,andthetheoreticalmodelofthevolumeofconveyingsoili

6、sestablished．Simulationexperimentsaboutcovetingwidtharecarriedoutbasedonthediscreteelementmethod(EDEM)，andthequadraticregressionmodelaboutcoveringwidthissetupbymeansoftheDesign．Expertsoftware．Onthisbasis．propertytestsofthecoveringsoilinthefieldaleconducted．

7、Theresultsshowthatwhentheratioofbeltvelocityandforwardvelocityincreasesfrom1．38to2．56．theaveragevolumeofcoveringsoildecreases；whentheheightofscraperincreasesfrom40mmto60nlm．theaveragevolumeofcoveringsoilincreases，theefficiencyofearth-fetchingandconveyingsoi

8、lreduces；whenthespacingofscraperandthedipangleofliftingbeltincreasefrom100nlrflto140miil，from350to55。respectively,theaveragevolumeofcovetingsoildecreases，theefficiencyofearth—fetchingandconveyingsoilre