共查询到19条相似文献，搜索用时 171 毫秒
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为加快纸膜覆盖水稻插秧技术的推广,提出设计水稻纸膜覆盖插秧机的基本思路,包括纸膜铺放机构、纸膜切断机构。该设计以期为以后生产样机和进一步优化设计水稻纸膜覆盖插秧机提供参考依据。 相似文献
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论述了水稻覆纸膜全程缓释底肥增产技术及设备研究项目的工作情况,重点介绍了2MZ-180型纸膜覆盖机及2F-6型缓释肥施肥机的研究、设计、加工和试验。指出了该项目的研究应用是实现绿色有机水稻生产及环境保护的良好措施之一,先进实用的水稻施肥、覆纸膜、插秧作业设备,可为绿色、有机水稻大面积生产作业奠定基础。在节肥、增效、提高水稻品质、减轻污染方面具有显著意义。 相似文献
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通过对高速插秧机进行改进和设计,研制水稻插秧机分段式压膜辊装置。介绍水稻插秧机分段式压膜装置的工作原理、工作参数以及各部位的结构设计思路。机具试验结果表明:该机覆膜667 m~2所需时间为4.88 min,覆膜效率高,故障率低,适于在有机水稻无公害化生产中推广应用。 相似文献
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针对水稻插秧机设计过程中存在的参数多、交互关系复杂、设计计算繁琐等特点,开发了一种人机交互式智能化设计平台,可缩短设计周期,优化水稻插秧机机构。通过对水稻插秧机的运动过程进行分析,认定插秧株距及插秧深度为插秧过程中的两大核心目标参数,建立各结构参数与目标参数之间的约束关系,并确定优化设计算法。利用优化设计算法,建立人机交互式设计系统,并利用设计系统得出水稻插秧机结构参数。对比分析及试验验证表明:该人机交互式智能设计系统可根据不同的设计需求快速有效地迭代出水稻插秧机结构参数,并进行最优化参数组合,有效地缩短设计计算周期,提高了设计效率及准确性。 相似文献
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本文以培杂泰丰杂交稻种为试验对象,在立体育秧温室培育穴盘秧苗。试验时苗龄28天,钵体含水率为35.76～54.08%,仪器为TA-XT2i型质地分析仪。对穴盘苗钵体进行平板压缩、加卸载循环和蠕变试验研究,发现平板压缩变形为3.15 mm前后,抗压力随变形的变化趋势差异明显,在4 mm压缩量前后,抗压力出现峰值上升变化陡点。当加载力为1、2、3、4、5 N,秧苗钵体的平均蠕变量为0.0055、0.0055、0.0056、0.0057、0.0059 mm。试验结果表明钵抗压力与变形呈非线性变动;平板压缩过程,钵体无明显屈服破坏点;苗钵体面对外界加卸载时表现较强塑变能力。选用Burgers模型能有效表征穴盘苗钵体压缩蠕变特性。最后通过分析多种稻种穴盘苗力学特性,结果发现不同穴盘苗钵抗压力与变形关系遵循非线性曲线。本研究结果为水稻移栽机设计优化提供理论参考。 相似文献
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于海青 《农业机械化与电气化》2010,(2):65-66
2BDS-1800型水稻苗床播种覆土机是针对丹东地区水稻双膜育苗技术研发生产的顺床作业的水稻苗床播种覆土机械．解决了双膜育苗的规格化、标准化问题,使育苗时播种密度和覆土厚度达到均匀一致,可满足机插农艺要求。介绍该机的技术参数和特点,分析其经济效益和社会效益,展望其应用前景。 相似文献
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《Journal of Agricultural Engineering Research》1999,72(3):247-257
A review of applications of finite element techniques in the calculation of stress distributions in grain kernels during moisture desorption and adsorption is given. In the analysis presented in this paper, the rice kernel was assumed to be a linear viscoelastic ellipsoid body. The model simulated the expansion of the rice kernel and evaluated the magnitude of the local strains and stresses. The finite element method was used to obtain a numerical solution to the stress–strain relationship. For determining fissure initiation and propagation, the failure criterion based on local strain energy density of distortion was used. For stress analysis, the maximum or ultimate tensile strength criterion was used. Simulations resulting from the model were compared with the experimental results. 相似文献
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Based on a comprehensive search and review of the literature, 42 studies are identified for in-depth review and analysis of documented impacts of agricultural research from 1959 to 2009. This body of evidence is subjected to a systematic, quantitative scrutiny for the coverage and type of impact to derive patterns, gaps and trends in documented impacts of research in the subregion. The analysis offers compelling evidence that past investments in agricultural research in the region have been productive. In so doing, the study also reveals some persistent patterns and identifies a number of gaps between investments and documented impacts. Strikingly, the benefits are principally derived from rice improvement research, which has generated 86% of total documented benefits in the Southeast Asia region over the past five decades. In comparison with rice improvement research, evidence of impacts in other areas such as natural resource management and other commodities is minor. This suggests that there is considerably more certainty about the ability of rice research, particularly genetic improvement, to generate impact than is the case for other research foci.However, even for rice, the evidence has been patchy across time and space. There has been no comprehensive and subregion-wide attempt to inventory trends in adoption of improved rice varieties and document historical net benefits generated by this research effort. Despite the large-scale, long-term and sustained adoption of research generated rice technologies for smallholder farmers in this subregion, an impressive story on the impacts of agricultural research on long-term developmental goals still remains undocumented. The paper also reveals a declining trend in total documented net benefits from agricultural research in recent years, which is probably attributable to research lag times and changes in the intensity of impact assessment over time. 相似文献
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区块链驱动的稻米供应链信息监管模型研究 总被引：1，自引：0，他引：1
针对稻米供应链业务主体复杂、信息流转冗长、数据利用率低、监管覆盖性差等问题,构建了区块链驱动的稻米供应链信息监管模型,并进行系统化实现。首先,对稻米供应链信息流转特性进行分析,梳理并提炼供应链各业务环节主体及关键信息;然后,以区块链驱动构建稻米供应链信息监管模型,设计隐私数据分级加密存储模式和定制化业务逻辑监管智能合约;最后,基于Hyperledger Fabric开源框架,构建并实现稻米供应链信息监管原型系统,并以湖南省常德市某粮油企业为例,进行了应用案例实证分析。结果表明,构建的稻米供应链信息监管模型及原型系统能够解决稻米供应链数据隐私加密、安全存储及权限管理等问题,实现供应链信息互联互通和有效监管。本研究可为粮油质量安全监管提供一种可行的应用方法。 相似文献
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三江平原地区水稻联合收割机选型问题的研究 总被引：2，自引：0，他引：2
运用模糊评判方法,对三江平原地区水稻联合收割机选型问题进行了研究;通过理论计算和田间实验研究,得出了三江地区水稻收获的适合机型。这些结果为水稻全程机械化实施和水稻收割机的配备提供了有价值的理论基础,对提高水稻生产机械化的经济效益有着十分重要的实际意义和参考价值。 相似文献