共查询到20条相似文献,搜索用时 62 毫秒
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2MG- 2开沟铺膜穴播机是一种适合于干旱缺水地区的多功能节水播种机具。该机能一次完成开沟、地膜覆盖、播种、覆土等多项作业,具有下籽均匀、株距均匀、增温、保墒、除草、防止冻害等优点。 1 主要结构及工作原理 该机由开沟犁、刮土板、铺膜装置、前后覆土滚筒、穴播器、取土器等主要工作部件组成。结构见图 1: 图 1 开沟铺膜穴播机结构简图 1.机架 2.地膜 3.刮土板 4.前覆土滚筒 5.穴播器 6.开沟犁 7.后覆土滚筒 8.前取土圆盘 9.后取土圆盘 2MG- 2穴播机是悬挂式铺膜穴播机。工作时首先开出一条空沟,然后使拖拉机的前轮与沟… 相似文献
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悬挂式植树挖坑机是以拖拉机为动力,悬挂在拖拉机上,由机械传动或液压驱动的植树挖坑机。由于四轮拖拉机社会保有量大,再加上悬挂式植树挖坑机结构合理,操作灵活、方便,维修简单,工作效率高。因此悬挂式植树挖坑机被广泛适用于植树造林和种植牛蒡、山药、生姜等经济作物的挖坑作业,是从事植树造林和种植经济作物发家致富的首选产品。 相似文献
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开沟是咖啡种植过程中的重要环节,现行的咖啡开沟劳动强度大、工作效率低、人工成本高。为此,在分析小粒咖啡种植开沟农艺要求的基础上,设计了一种适合于小粒咖啡开沟的斜置逆转开沟器。该逆转开沟器可通过小型拖拉机牵引,刀轴旋转方向和拖拉机驱动轮转向相反,开沟刀向前向上切土抛土,完成开沟。应用EDEM离散元软件对逆转开沟器进行仿真模拟:设定开沟器前进速度为0.4m/s、转速为4rad/s时,单个圆盘开沟过程所受的最大阻力为750N,挡土板所受最大阻力为250N。同时,进行了试验验证,结果表明:逆转开沟器能开出沟面宽500mm、沟底宽300mm、沟深400mm的梯形栽植沟,所开沟型结构稳定,抛土效果好。 相似文献
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针对大棚秸秆生物反应堆人工开沟劳动强度大、工作效率低,传统机械开沟体积大、功耗大、深度控制智能化程度低等问题,设计一种液压调节式纵向旋转开沟机。开沟机与拖拉机后三点悬挂配套使用,万向节传动,结构简单紧凑;刀轴纵向循环渐进切土、抛土,功耗低;对开沟机进行结构分析,通过液压控制实现对不同农艺要求的开沟深度。通过静力学分析,开沟机满足设计要求,能够给农业生产带来便利,适应市场需求。 相似文献
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张旭东 《农业机械化与电气化》1995,(3):20-21
2BQ-2型气吸播种施肥机是为小四轮拖拉机配套的一种全悬挂新型气吸播种施肥机具,1990年12月通过省级科研鉴定。该机可一次完成开沟、施肥、播种、镇压及覆土等作业,已达到国内先进水平。 1.结构及工作原理 该机由风机、主梁、纵梁架、施肥开沟器、播种开沟器、排肥器、排种器、地轮、镇压轮以 相似文献
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水稻种绳直播机作业参数对种绳覆土厚度影响的试验 总被引:3,自引:0,他引:3
为了考察种绳直播机作业过程中所选取的工作参数对水稻种绳覆土厚度的影响,进行了水稻种绳覆土厚度测试试验.试验采用三因素二次回归组合正交试验设计,分析了种绳直播机行驶速度、开沟器开沟深度、覆土器挡板角度对种绳覆土厚度的影响关系,确定各因素之间的回归数学模型为(y)s=27.65 +0.5x1+1.06x2-0.64x3+0.48x'21-0.49x’23.试验结果表明,利用贡献率法确定因素的主次关系为开沟深度x2>覆土器挡板角度x3>行驶速度x1;对回归方程进行优化求解,当覆土厚度目标值为27.34mm时,种绳直播机行驶速度为0.17m/s、开沟器开沟深度为36.34mm、覆土器挡板角度为72.21°. 相似文献
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根据新疆果园的农艺种植特点,设计了一种后悬挂式开沟施肥覆土机.该机采用人字铲式开沟器在地表开出一定深度沟槽,深度在20~30cm范围可调节,在开沟槽内施肥,最后应用双圆盘式覆土机构完成覆土作业.田间试验表明:该机的开沟深度、施肥深度、施肥均匀性、覆土效果均达到了技术要求;作业速度为2 km/h时,机具总体作业较平稳,作... 相似文献
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《农业装备与车辆工程》2021,(6)
为提高拖拉机的利用率,实现拖拉机前悬挂农业机具作业,提出了拖拉机前悬挂旋耕破茬机,采用前置三点悬挂的方式挂接旋耕破茬机,在拖拉机前端同时实现旋耕和破茬两种作业。采用SolidWorks软件对该结构进行三维建模,将模型简化然后导入软件ADAMS进行运动仿真,得到旋耕刀运动轨迹曲线和前悬挂装置主要杆件的受力,针对主要杆件和旋耕刀的工作载荷,在软件ANSYS中进行力学分析,结果表明,主要杆件受力满足强度要求,验证了结构设计的可靠性。 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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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
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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