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碎壳损伤是影响花生籽粒品质的重要因素之一。本文研究新型锥体式花生碎壳机构在破碎花生壳体过程中花生籽粒的损伤成因;基于运动与能量原理,分析碎壳过程中致使花生籽粒损伤的因素。通过试验,研究了锥体式碎壳机构的结构形式及工作状况对花生籽粒损伤程度的影响,对进一步研究机械碎壳花生籽粒损伤机理,验证结论的正确性,为花生碎壳机械对花生籽粒的损伤研究提出了新思路,为设计新型花生碎壳机械的碎壳方法提供了理论基础。 相似文献
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为丰富我国的花生收获机械,研制了螺旋弓齿式全喂入花生摘果机。介绍摘果机的设计方案及原理,探讨其主要结构及装置(摘果装置、传动机构、凹板筛)的设计思路。对花生植株在摘果滚筒中的受力进行分析,总结其在滚筒中的受力及运动特点。 相似文献
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《拖拉机与农用运输车》2016,(4):61-66
为满足长物料如拖拉机桥壳类零件的横向步进输送需求,提供了一种用于步进输送的气缸驱动机构,不仅可有效解决较长物料"横向运行"时易出现的"运行偏移"及活塞杆单边径向受力增加的问题,而且可依据作业现场需求实施"推送"或"拉送"式输送选配及被输送物料"受力点"的调整确定。该机构运行平稳,安全可靠,结构新颖,易于制作,具有良好的使用价值。 相似文献
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花生脱壳装置力学分析 总被引:1,自引:0,他引:1
立锥式花生脱壳机的设计改变了传统的卧式脱壳原理,实现了高效率和高脱净率。通过分析立锥式花生脱壳装置与卧式脱壳装置花生脱壳时受力的不同,研究不同脱壳原理下的花生受力情况,验证立锥式脱壳装置脱壳原理的优点,为今后脱壳机设计及改进提供理论依据。 相似文献
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4HW-65D型四轮悬挂花生收获机是我公司根据当前农村的实际情况研制开发的一种新型花生收获机,整机由四轮拖拉机输出动力离合器、传动机构、分秧器、挖掘铲、多功能升运输送装置、机架、地轮等组成,科学、合理地利用拖拉机动力,通过分秧、挖掘、碎土、抖土和铺放等工序一次完成花生收获作业。其创 相似文献
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PXF-Ⅰ型旋缝式雾化喷头(见附图)是一种新型的漫射式喷头。它具有离心式和缝隙式喷头的特点,仅有内芯和外套两个零件组成,结构简单,现将工作原理和理论研究浅析如下: 一、工作原理当压力水(2公斤力/厘米~2左右)进入喷头后,经内芯上的两条螺旋槽流入喷腔,由于喷腔中内芯为倒锥形,所以喷腔呈环形收缩流道,使螺旋槽出来的水流一方面具有环量,另方面又在环形收缩流道内作加速旋涡运动,最后经内芯和外套形成的环缝与 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