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针对为22.05kW以下小四轮拖拉机配套的联合整地机械较少的问题,设计出1GZM-120型和1GZM-130型两种型号的通轴联合整地机械。介绍了联合整地机械的结构、原理、特点、技术参数及应用情况,对灭茬传动箱主要部件传动链进行了设计校核。该机型可根据不同的作业要求形成不同组合,具有一定的通用性,为整地作业提供了新的选择。 相似文献
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为探究不同整地机械作业对土壤结构的影响规律,根据影响规律分析不同整地机械的优缺点。选定深松机、旋耕机和联合作业机进行田间作业对比,分析作业后的土壤物理参数,深松机对土壤的疏松能力较好,旋耕机的碎土能力较好且能保证一定的土壤平整水平,联合作业机综合能力较强,能提高农业生产效率,间接提高作物产量。研究得到不同整地机械对土壤结构的作业特点,为后续相关研究和整地机械的研制提供参考。 相似文献
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<正>1从机械角度提高联合整地机作业质量1.1老式联合整地机在棉花整地作业中存在的问题老式1ZL-40型一体式联合整地机,前组采用圆盘耙片,后组采用缺口耙片,在纵梁后直接悬挂两组碎土器,后面挂接镇压器。该机型缺点: 相似文献
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联合整地机是与大中型拖拉机配套的复式作业机械,一次可完成灭茬、旋耕、深松、起垄、镇压等多项作业.主要特点:一是作业效率高,与东方红-804配套的210cm耕幅的联合整地机,其作业效率为0.67~1hm2/h. 相似文献
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<正>近年来,新疆兵团农牧团场整地方式大多采用用联合整地机对角两遍整地作业。虽然整地效果较好,但是,仍然存在漏切的问题。另外,整地机械类型中虽有驱动耙作为补充,整地效果优于联合整地机,但普遍机型幅宽不超过4米,作业效率较低。整地机械类型还有联合整地机配合传统的钉齿耙整地作业,作业质量也有明显提高,但整机成本较高。 相似文献
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机械化深松整地技术应用(续9) 总被引:1,自引:0,他引:1
1SZL—260型偏柱式深松整地联合作业机结构特点及调试1SZL—260型偏柱式深松整地联合作业机是一种同时具有深松和整地功能,能实现深松、平整、碎土和镇压复合作业,对农田进行深层偏柱式松土铲深松、浅层耙片、鼠笼式碎土镇压整地的耕作机械。 相似文献
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为满足辽宁地区生产的实际需要,研制一种与轮式拖拉机配套、易操作、适合不同地块作业的农机系列产品。介绍联合整地机的结构、设计原则、技术参数、作业性能等,为农业生产提供适用的农田作业机械。 相似文献
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概述了浅深松联合整地机械的应用进展,介绍了浅深松联合整地机械的基本工作原理和结构组成,以及该机械在不同农业生产条件下的应用情况,进一步分析了该机械的优点和存在的问题,探讨了未来浅深松联合整地机械的发展方向。随着农业生产水平的提高和技术的不断创新,浅深松联合整地机械将会更加智能化和自动化,同时还需要注重其与其他农业机械的协同作业,以提高整体作业效率和降低成本。 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