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直立锥滚筒式小区花生脱壳机设计与试验 总被引：3，自引：0，他引：3
对于育种和栽培等科研用小区花生脱壳而言,不但要求脱壳机适应小量脱壳,而且要求脱壳过程中损伤小、清种快捷方便。目前小区试验的花生脱壳主要靠人工作业,脱壳效率低下,容易出现清种不便和不净,造成每个小区处理之间的"混杂"等现象。为此在对现有卧式花生脱壳机特点研究的基础上,提出了直立式锥滚筒花生脱壳方案,进行了脱壳机总体结构设计;在花生荚果脱壳受力分析基础上,确定了锥滚筒脱壳结构及其参数范围;最后以四粒红花生为研究对象,以锥滚筒转速、锥滚筒半锥角、最小脱壳间隙为因素进行性能影响试验,结果表明在锥滚筒转速为340 r/min、锥滚筒半锥角为40°、最小脱壳间隙为10 mm时脱壳综合指标最优,脱净率为97. 84%,损伤率为2. 97%,较好地满足了小区花生脱壳要求。 相似文献
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刘明国 《农业机械化与电气化》2012,(9):24-26,30
设计一种立锥式化生脱壳装置,其关键部件主要由脱壳锥滚筒和锥筒凹板筛组成,锥滚筒与锥筒凹板筛以一定的角度配合作用以达到脱壳的目的。对该脱壳装置的锥滚筒、锥筒凹板筛、传动系统和附件进行详细设计,得出各部件的参数方案,并对整机关键部件及附件进行加工。为花生脱壳机的进一步研制和参数优化提供数据支撑。 相似文献
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立式锥滚筒花生脱壳装置结构与参数设计 总被引：1，自引：0，他引：1
关绍春 《农业机械化与电气化》2014,(7):36-38
设计一种立式锥滚筒花生脱壳装置。阐述该装置脱壳原理,对立式锥滚筒、锥筒凹板筛、传动系统、附件等关键部件进行优化设计,并进行整机装配。该脱壳装置结构设计合理,突破了传统的脱壳模式,提高了脱壳效率。 相似文献
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通过对双滚筒花生脱壳机整机结构与工作原理及关键部件进行详细分析研究,提出立式锥滚筒花生脱壳机的总体设计方案,对二者进行对比研究,为提高花生脱壳生产效率、降低花生米破损率、扩大花生脱壳机的适应范围提供新思路及新途径。 相似文献
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双滚筒气力循环式花生脱壳机设计 总被引：5，自引：0，他引：5
提出了双滚筒气力循环式花生脱壳机总体结构方案、二次循环脱壳与气力输送工作原理,进行了双滚筒脱壳装置、清选装置和传动系统等关键工作部件的结构设计.双滚筒脱壳装置由直径、转速不同的一次脱壳滚筒和二次脱壳滚筒以及各自的凹板筛构成;清选装置主要由振动筛和风机组成.花生脱壳试验结果表明:适宜含水率下花育23品种花生,在一次脱壳滚筒和二次脱壳滚筒转速分别为296、392 r/min时,花生脱壳综合性能指标最优,即花生脱净率为99.12％,花生仁破碎率为1.82％,花生仁损失率为0.40％. 相似文献
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为改善花生脱壳机的脱净率,利用SolidWorks软件建立脱壳装置三维模型,在EDEM中构建滚筒凹板筛式花生脱壳机脱壳装置的破碎仿真模型,为探究滚筒凹板筛花生脱壳机的工作性能,以高油花生新品种宇花14号为试验样本,通过颗粒替换建立花生荚果仿真模型,采用单因素试验法对花生脱壳结构性能进行仿真分析,分别探究滚筒转速、滚筒凹板筛间隙、喂入量对花生脱壳性能的影响。试验结果表明：在保证其他因素一定的条件下,滚筒转速越大,黏结键破碎数目越多,滚筒转速为290r/min时,黏结键破碎数最高,为21 756;凹板筛间隙越大,黏结键破碎数目越少,凹板筛间隙为19mm时,黏结键破碎数目最高,为21 047;随着喂入量的增加,黏结键破碎率先增加后减小。研究可为滚筒凹板筛式花生脱壳机械的设计与优化提供理论依据。 相似文献
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Overland water and salt flows in a set of rice paddies 总被引：1，自引：0，他引：1
E. Playn O. Prez-Coveta A. Martínez-Cob J. Herrero P. García-Navarro B. Latorre P. Brufau J. Garcs 《Agricultural Water Management》2008,95(6):645-658
Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m−1) and an infiltration rate of 5.8 mm day−1. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day−1), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day−1 was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration. 相似文献
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车用发动机润滑油失效规律与更换周期研究 总被引：7，自引：0，他引：7
研究在正常使用条件下１０Ｗ／３０－ＱＣ级润滑油用于某型车用发动机时所表现的失效规律,确认期服从两参数Ｗｅｉｂｕｌｌ分布,并给出分布的尺度参数η和形状参数ｍ之最佳线性无偏估计（ＢＬＵＥ）同时,还为定量分析,计算车用发动机润滑油的使用可靠性和合理确定其更换周期提供了一套可供借鉴的方法,并给出了具体的计算实例。 相似文献
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对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。 相似文献
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对《种子法》存在问题的探讨 总被引：1，自引：0，他引：1
李鹏 《农业机械化与电气化》2011,(6):129-130
《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。 相似文献
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瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。 相似文献
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赵国杰 《农业机械化与电气化》2011,(4):106-107
乡（镇）农技推广体系是农业发展的关键。介绍朝阳市农业技术推广体系的现状,针对目前体制及运行机制、服务手段等方面存在的问题,提出适合朝阳市乡（镇）农技推广体系改革与发展的对策,以期对全省农技推广体系改革和发展起到一些借鉴作用。 相似文献
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苑庆刚 《农业机械化与电气化》2010,(3):52-54
草莓果味酸甜爽口,营养价值高,为人们所喜爱的应市鲜果之一。由于草莓易受损伤和微生物侵染,因此其采收、贮藏过程极为重要。介绍草莓采收过程中的注意事项以及11种贮藏保鲜技术的实施步骤和操作方法,推介9种加工方式,为草莓产业化提供技术支持。 相似文献
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在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。 相似文献
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About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered. 相似文献