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谷物联合收获机清选系统研究现状 总被引：1，自引：0，他引：1
《中国农机化学报》2020,(6)
现阶段国内谷物联合收获机在收获过程中由于清选系统结构配置、作业参数调整不当等而导致谷物机械化收获损失率及含杂率较高。国内外谷物联合收获机清选系统的研究主要集中在清选装置结构、关键部件、气流场分布及物料运动规律等方面,为解决谷物清选装置清选效率低、总损失率和含杂率高、结构复杂等问题,提高谷物联合收获机清选系统的作业效率和性能,逐步实现信息化和智能化,结合现阶段研究现状,对试验研究中所采用的Fluent、ADAMS、CFD-DEM等软件仿真结果和田间试验结果综合分析,提出谷物清选系统结构优化的发展趋势,以期为谷物联合收获机整机结构改进提供参考依据。 相似文献
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以发明专利"一种先梳脱籽粒后碎稿回田的收获方法及其联合收获机"为核心设计的4LTG1.45割前脱粒稻麦联合收获机作业时,梳脱装置梳脱下的脱出物被输送到复脱清选装置复脱、清选后装袋,脱净籽粒后的茎秆随后被碎稿回田装置粉碎并均匀铺放于田间,籽粒收获与茎秆粉碎一次完成,收获工艺流程先进可靠、效率高、损失低,特别对作物适应性方面在梳脱式联合收获机中居国内外领先. 相似文献
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以发明专利“一种先梳脱籽粒后碎稿回田的收获方法及其联合收获机”为核心设计的4LTGl．45割前脱粒稻麦联合收获机作业时，梳脱装置梳脱下的脱出物被输送到复脱清选装置复脱、清选后装袋，脱净籽粒后的茎秆随后被碎稿回田装置粉碎并均匀铺放于田间，籽粒收获与茎秆粉碎一次完成，收获工艺流程先进可靠、效率高、损失低，特别对作物适应性方面在梳脱式联合收获机中居国内外领先。 相似文献
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以发明专利“一种先梳脱籽粒后碎稿回田的收获方法及其联合收获机”为核心设计的 4ＬＴＧ1 .45割前脱粒稻麦联合收获机作业时 ,梳脱装置梳脱下的脱出物被输送到复脱清选装置复脱、清选后装袋 ,脱净籽粒后的茎秆随后被碎稿回田装置粉碎并均匀铺放于田间 ,籽粒收获与茎秆粉碎一次完成 ,收获工艺流程先进可靠、效率高、损失低 ,特别对作物适应性方面在梳脱式联合收获机中居国内外领先。4ＬＴＧ1 .45割前脱粒联合收获机主要技术指标如下 :收获幅宽 :1 .45ｍ配套动力 :485柴油机作业速度 :0～ 2ｍ/ｓ (常用 1～ 1 .3ｍ/ｓ)平均生产率 :4～ 7亩 /… 相似文献
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一、相关性能测试
4LZY-2A玉米籽粒收获机是在4LZ-2A自走式轴流谷物联合收割机的基础上开发的自走式玉米籽粒联合收获机,可以收获玉米、小麦、水稻等多种作物。产品采用切、轴流双滚筒脱分原理,风筛式清选和风扇式复脱技术,收获玉米时的工作流程与收获小麦相同。作业时将整株玉米喂入,然后进行脱粒、分离、清选和集粮。 相似文献
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多参数可调可测式清选系统设计与试验 总被引：2，自引：0，他引：2
为了改善国内谷物联合收获机风筛式清选装置清选作业参数的调控、监测与显示方式简单且自动化程度较低导致清选效率较低的问题。分析了谷物联合收获机风筛式清选装置4个清选作业参数（振动筛曲柄转速、风门开度、风机转速和鱼鳞筛筛片开度）的调节理论依据,对每个清选作业参数的调控与监测装置进行独立设计,在联合收获机风筛式清选装置基础上设计了多参数可调可测式清选系统,实现风筛式清选装置清选作业参数的自动化调控、监测与显示,整体系统采用电力驱动,实现了收获机风筛式清选装置的绿色环保作业。经准确性检测多参数可调可测式清选系统4个清选作业参数的调节精度均不小于97.17%,具有良好的鲁棒性,可实现4个清选作业参数的精确调控与实时显示。本文利用装配了多参数可调可测式清选系统的4LZ-4型全喂入履带收获机,以总损失率和含杂率为清选性能评价指标,进行了大豆机收田间试验,试验时样机运行良好。试验结果表明,大豆机收田间试验总损失率和含杂率平均值分别为3.13%和2.70%,达到行业标准要求。 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性，认为在缺水不可避免的情况下，对供水进行优化调度可以减小缺水带来的损失，产生较好的减灾效益，特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性，提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献