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1、2018年9月农业机械学报第49卷第9期doi:10.6041/j.issn.1000鄄1298.2018.09.038真空干燥过程中物料质量在线测量设备设计与试验111121薛令阳摇王书茂摇高振江摇于贤龙摇林摇海摇魏摇青(1.中国农业大学工学院,北京100083;2.辽宁工程技术大学电气与控制学院,葫芦岛125105)摘要:针对真空脉动干燥过程中物料质量在线获取易受到机械振动、温度变化和气流短时冲击等多重干扰,导致测量困难、测量精度不高的问题,提出了将固定料架和测量料架分离的测量方案,并选用高精度的测量器件,在经过信号滤波、温度修正和气流干扰
2、排除等多种修正手段后,实现了温度变化范围20~45益、无明显外部剧烈振动、冲击时间小于1min的正常进抽气条件下总量程1500g、去掉料盘后有效量程1000g、最大引用误差0郾1%的物料质量在线测量。静态测试结果显示,满量程最大引用误差0郾06%,物料干燥测试结果显示,干燥终点最大引用误差0郾1%,能够清楚反映整个干燥过程中的质量变化情况和干燥速率变化情况,可为研究农产品干燥过程中物料状态变化规律和实现自动干燥工艺调控提供技术支持。关键词:真空干燥;质量;在线测量;设备;设计中图分类号:TP29;S375文献标识码:A文章编号:1000鄄129
3、8(2018)09鄄0326鄄12On鄄lineMeasurementofMaterialQualityinVacuumDryingProcess111121XUELingyang摇WANGShumao摇GAOZhenjiang摇YUXianlong摇LINHai摇WEIQing(1.CollegeofEngineering,ChinaAgriculturalUniversity,Beijing100083,China2.FacultyofElectricalandControlEngineering,LiaoningTechnicalUniv
4、ersity,Huludao125105,China)Abstract:Thechangeofmaterialmassisanimportantparameterofmaterialstateevaluationduringthedryingprocess.Pulsedvacuumdryingprocessisasealedstate,herein,thedeviceofmassmeasurementmustbeinstalledinsidethedryingchamber,whichleadstothemeasurementprocessin
5、gvulnerabletointerference,includingthemechanicalvibrationcausedbyequipmentoperation,temperaturechangecausedbydryingroomheating,airflowinterferenceswhichwithpulsatingstate.Themultipleeffectsofthesedisturbancesmaycauselowmeasurementaccuracy.Inordertosolvethisproblem,ameasureme
6、ntplanforseparatingtheheatingplatefixedmaterialrackandthematerialmeasuringrackwasputforward.Firstly,thevibrationcharacteristicsoftherackwereeffectivelyanalyzed.Theminimumresonancevibrationfrequencywasabout8Hz,andthemainresonancefrequencywasabout25Hz.Accordingtothevibrationch
7、aracteristic,two鄄orderIIRdigitalfilterweredesigned,whicheffectivelysolvedthevibrationproblem.Thenthedriftcharacteristicsofthesensorweremeasuredforzerodriftofthesensorcausedbytemperature.Thecorrectiontemperaturerangewas20~45益,anditwasfoundthatitcanbecorrectedbyfiveorsixorderp
8、olynomials.However,thehighercalculationofhigherorderpolynomialswasnotconduc
