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拖拉机是我国农业生产的基础性工具,在我国农村地区的保有量很高,拖拉机除具备运输功能外,还能通过悬挂多种农机具实现对应的农机化作业。通过对拖拉机的悬挂系统及其附属功能进行介绍,说明了拖拉机的相关功能和特点,并总结了配套农机具作业时的注意事项。 相似文献
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《拖拉机与农用运输车》2020,(1)
拖拉机是农业生产最常用的机械之一,农民能够通过使用拖拉机配套不同种类和功能的农机具完成多种农业生产任务。为满足不同农机具的功能需求,在传统拖拉机悬挂技术的基础上研究和推广电液悬挂控制技术具有现实意义,通过对比传统液压悬挂技术和电液悬挂控制技术,说明了电液悬挂控制技术的先进性和主要控制形式,并对其技术实施途径进行了设计。 相似文献
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液压悬挂系统是大马力拖拉机与农机具配套作业的重要连接装置,通过液压悬挂系统能够实现大马力拖拉机配套宽幅农机具的高效作业,很适合现阶段大规模农业生产使用。重点研究了液压悬挂系统的工作原理,并对大马力拖拉机的常见故障问题进行了分析并给出了排除的方法,强调了通过合理使用和维护液压系统有利于减少故障概率。 相似文献
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拖拉机在农业生产中的重要性主要体现在其能够配套多种农机具完成不同的农业生产任务,液压悬挂系统作为拖拉机与配套机具连接与功能控制的纽带,其技术的先进性对于拖拉机的性能发挥影响很大.液压悬挂系统作为拖拉机的功能扩展部件,在拖拉机中的使用率很高.要进一步提高拖拉机使用的合理性,拖拉机驾驶员应清楚认识拖拉机液压悬挂系统的组成与... 相似文献
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随着拖拉机技术的快速发展,拖拉机的性能得到快速提升,能够配套多种农机具完成农业生产任务,其中耕整机是与拖拉机配套最为紧密的农机具。为提高拖拉机配套耕整机作业质量,对拖拉机配套耕整机的结构形式进行分析,说明了耕整地作业的技术流程及常见耕整地机具的操作要点与注意事项。 相似文献
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伴随当今现代化农业的迅速发展,农用拖拉机已经成为了农业种植生产作业过程中最重要的农业机械之一,农户可以通过农用拖拉机与各类农机具配套使用,完成农业领域中的各项作业.为了能够更好地完成各项农机作业,在对传统型农用拖拉机进行技术改善过程中,提出了农用拖拉机电液后悬挂技术,对其推广应用进行研究探讨,为后续该类技术的发展提供借... 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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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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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