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切纵流联合收获机脱粒分离装置田间试验与参数优化 总被引:3,自引:0,他引:3
为了研究切纵流联合收获机脱粒分离装置的最佳结构参数和运动参数,对履带式切纵流联合收获田间试验机进行结构改进、载荷测试系统的构建和水稻田间试验,研究切流滚筒、纵轴流滚筒间隙和切流滚筒、纵轴流滚筒转速对脱粒总功耗、切流滚筒功耗、纵轴流滚筒功耗和夹带损失率等性能的影响。并对总功耗和夹带损失率的数据进行二次多项式回归分析和复合型优化分析得到最佳参数配置:切流滚筒间隙为30.99 mm,纵轴流滚筒间隙为14mm,切流滚筒和纵轴流滚筒转速为892.95、848.95 r/min。试验表明,该参数组合下,脱粒总功耗39.03 k W,切流滚筒功耗11.72 k W,纵轴流滚筒功耗27.31 k W,夹带损失率0.50%。对切流滚筒和纵轴流滚筒下方脱出混合物分布进行了研究,为清选装置的设计与优化提供了依据。 相似文献
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油菜联合收获机集成式纵轴流脱离装置设计与试验 总被引:4,自引:0,他引:4
针对油菜联合收获机链耙式输送器结构复杂、输送路程长、存在堵塞的问题,设计了一种集成式纵轴流脱粒分离装置,将强制喂入装置与纵轴流脱粒分离装置合二为一,二者呈"T"字形垂直排布,取代传统的链耙式输送器,依靠强制喂入装置和纵轴流脱粒分离装置实现油菜输送、抓取、脱粒分离功能。依据集成式纵轴流脱粒分离装置的工作过程,确定了强制喂入轮和纵轴流脱粒滚筒直径和转速等主要参数。试验表明,喂入量为2.0 kg/s,强制喂入轮转速在300~450 r/min时,该装置脱粒油菜的夹带损失率低于1.31%;强制喂入轮转速为400 r/min、喂入量在1.0~2.5 kg/s时,夹带损失率低于1.18%,符合油菜脱粒分离装置的设计指标。田间试验表明集成式纵轴流脱粒分离装置可适应油菜联合收获机的作业要求,实现物料由割台至脱粒分离装置的均匀连续输送和脱粒分离功能。 相似文献
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纵观国内联合收割机市场,除小履带、背负机生产厂家外,其它“-2型机”的生产企业都是在提高质量、多功能、高效率以及舒适、美观等方面来满足市场,除迪尔佳联推出3316切流 单滚筒纵轴流形式的收割机外,其他厂家均停留在切流 横轴流形式的收割机研制上。以中型为主,且多功能、高性能、高效率的大、 相似文献
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谈谈小麦联收机的社会效应小麦联合收割机(下简称“联收机”),是将小麦收割、脱粒、清选、装袋等项作业集于一身的农业机械。1994年河北省新增3400台,比1993年增长54.6%,增长幅度历史之最。1995年又增加1千多台。为什么会有如此高的增长幅度?笔者通过调查分析,提出如下浅见,与同行商榷。(1)购买联收机能致富中型自走式联收机每台7万元左右,每小时可收获小麦8亩左右;背负式联收机每台2万元左右,每小时收获小麦4亩左右。,一个麦收季节一台自走式联收机能收获小麦1200亩;一台背负式联收机可收获… 相似文献
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正5月13日,中国农发巨明集团发布了一批新产品,包括多功能纵轴流谷物机、大蒜收割机、新型拖拉机等。有20多名经销商代表、200多名职工代表共同见证了这时刻。据了解,这批新产品分布在不同领域,小麦机继续向高端发力,经济类收获机迎来了新成员,尤其是504、704新型拖拉机的亮相,更坚定了巨明集团进军动力机械的信心和决心。多功能纵轴流谷物机是这批 相似文献
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大型高效联合收获机大都采用纵轴流脱粒系统。为了提高我国联合收获机的工作效率和工作质量,推动我国纵轴流联合收获机的发展进程,系统概述了单纵轴流脱粒系统的工作流程及总体布置形式,针对单纵轴流脱粒系统的喂入问题现状及形成原因进行了分析总结,对国内外单纵轴流脱粒系统的喂入技术应用现状进行了归纳梳理,为我国研发高性能、高效率的单纵轴流式联合收获机提供了参考。 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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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
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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