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温室并联移栽机器人设计与试验 总被引：1，自引：0，他引：1
针对目前温室穴盘苗移栽作业存在的人工成本高、移栽作业效率低及国外移栽机不能适应我国温室穴盘苗移栽需求等问题,从移栽需求入手,制定了框架结构、并联机器人及输送装置3部分的设计方案,设计了一款结合自动化输送装置的并联移栽机器人,其具有刚度大、精度高及累积误差小的特点。同时,进行了将128孔穴盘黄瓜苗移栽至72孔穴盘中的移栽试验,结果表明:该温室并联移栽机器人在移栽加速度高于20mm/s~2时,移栽钵苗合格率明显降低。 相似文献
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育苗移栽是农作物增产增收的一项有效措施,为了提高穴盘苗移栽的可靠性和作业效率,对穴盘苗移栽机的取送苗装置进行优化设计和试验研究。对取苗机构和送苗机构进行力学分析与结构设计,确定其最优结构和参数。土槽试验结果表明:移栽机取苗速度为40株/min时,取苗成功率为97.21%,穴盘苗平均基质损失率为7.97%,栽植成功率为95.40%,作业可靠性达到92.74%。移栽机移栽作业各项指标满足农艺要求,可为小型移栽机的设计提供理论参考。 相似文献
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温室穴盘苗自动移栽机设计与试验 总被引：12，自引：0，他引：12
针对种苗从高密度穴盘移植到低密度穴盘,或者从穴盘直接移植到花盆的温室穴盘苗移栽生产需要,设计了一种轻简型自动移栽机。利用成熟的直线模组和无杆气缸组合设计出自动移栽机械臂,驱动取苗末端执行器往复于来源盘和目标盘进行取苗、移苗、栽苗操作,采用双排链传动实现穴盘和花盆输送,对穴盘苗的夹取操作采用气动两指四针钳夹式夹钵取苗方法。根据所设计的移栽机工作要求,构建电气控制系统。试制样机,开展试验研究。采用直线位移传感器系统检测分析机器取苗移栽移位性能,结果显示对于128/72孔穴盘苗,移栽效率分别达到1 221株/h和1 025株/h,运用单样本t检验法分析得到实测取苗移位间隔与理论设定穴孔间隔无显著差别,标准差低于0.5,整机工作精度准确。以当地自行培育的种苗为移栽对象,进行温室穴盘苗移栽生产试验,对比分析自动取苗移栽效能,结果显示多种穴盘苗移栽成功率平均达到90.70%,苗钵夹取破碎率低于5%,自动取苗移栽效果较好。 相似文献
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基质块苗移栽机送取苗装置的设计与试验 总被引：1，自引：0，他引：1
针对蔬菜基质块苗研究设计一种移栽机送取苗装置,该装置由基质块苗输送和取苗定植两部分配合作业,可实现蔬菜基质块苗的成排输送、自动取苗、单株定植等功能。为此,阐述了送取苗装置的结构组成、工作原理与关键部件的设计及参数确定,并对送取苗装置的工作性能进行分析。试验表明,当机器前进速度为1～1.2 km/h、取苗爪工作频率为55株/min时栽植效果最佳:漏栽率为1.3%,倒伏率为3.4%,栽植合格率为95.3%,满足蔬菜移栽机相关行业标准要求。该装置结构紧凑,送取苗稳定可靠,可为基质块苗移栽机的研究提供参考。 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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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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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