共查询到18条相似文献,搜索用时 109 毫秒
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勃农兴达机械有限公司生产的2BJD-2型电子数字监测精密播种机与11.03~17.64kW(15~24hp)四轮拖拉机配套,适用于大豆、玉米等作物的垄上播种与平播作业。一次播两行。该机既能一次完成深施化肥、播种、开沟、覆土、镇压等项作业(各种作物的株距均可调)。又能在播种过程中准确计算出播种量,可监控播种时种子的流动情况,对漏播、断条、堵塞等现象及时发出声光报警。卸掉播种装置可装成三铧犁,又能用于垄作农田的起垄、中耕、松土等作业。增加一组播种部件可以进行小垄密植和平播作业。购置并更换相应排种轮还可进行高梁、甜菜、白瓜籽、花生、向日葵等作物穴播。 相似文献
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播种质量的高低直接影响到作业生产率和出芽率,而目前的装置大多结构复杂,价格昂贵,本研究设计了一种自动测试小麦精播机排种均匀性的检测装置,系统使用MCS-51系列单片机及传感器组成硬件测试系统,实现了对小麦精播机输种管中的种子的实时检测和显示,并具有结构简单,性能可靠等特点。 相似文献
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根据农作物播量大(特别是小麦)在实施保护性耕作技术中存在的突出问题,分析其原因,研究提出推广精少量播种技术的核心是减少播量。通过减少播量来减少基本苗数和群体量,提高成穗率、穗粒数和千粒质量,实现高产稳产。介绍了合理确定作物播量、播深的方法及数据。得出了扩大精少量播种应用区域和应用作物,加大精少量播种的试验研究和宣传培训力度,制定新的精少量播种作业技术规范、作业质量标准等技术文件的结论和建议。 相似文献
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精密播种机的监控系统是现代精密播种机一个重要组成部分,其性能的好坏将影响精密播种质量。为此,介绍了目前精密播机种监控系统的概况,分析了现有监控系统的工作原理以及精密播种机监控系统的发展趋势。 相似文献
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<正>1节水精播节水精播,是河北省重点推广的农机化新技术,适用于干旱、半干旱地区抗旱作业,可播种玉米、花生及大豆等作物,一次即可完成开沟、深施化肥、穴灌水、播种、覆土、镇压和覆膜等作业,作业前不需要人工洇地,具有节约水资源及确保适时播种,可实现苗全、苗齐和苗壮等特点,经济效益、社会效益和生态效益显著。承德县有耕地3.17万hm2,其中旱地1.17万 相似文献
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精密播种机监控系统的研究现状与发展趋势 总被引:4,自引:0,他引:4
精密播种机的监控系统是现代精密播种机一个重要组成部分,其性能的好坏将影响精密播种质量。为此,介绍了目前精密播机种监控系统的概况,分析了现有监控系统的工作原理以及精密播种机监控系统的发展趋势。 相似文献
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采用世界上最先进的气吸式排种器(与法国库恩播种机排种器相同),播种精度高,单粒率达到95%,漏播率小于0.5%,种子无破碎;播种速度高,工作速度可达13km/h。真正实现了高速、全免耕作业。 相似文献
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机械气力组合式花生精量排种器设计与试验 总被引:1,自引:0,他引:1
针对气吸式排种器播种花生等大粒径种子时吸附率低、风压需求大等问题,采用气力与机械协同取种、断气卸种、机械携种等方式,设计了一种机械气力组合式花生精量排种器。在充种阶段采用凸块扰动、定位和托持种子,并配合型孔负压协同取种,可有效提高充种性能。不同结构排种盘的扰种性能仿真分析表明,环槽双V形凸块扰种效果最佳。以种子外形尺寸、排种盘转速和工作负压为影响因素进行了双V形凸块结构的排种性能试验,结果表明类球形种子的排种性能最优。通过多目标参数优化确定了排种器的最佳参数组合。田间试验结果表明,该排种器满足花生精量播种要求。 相似文献
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为满足机械式精密排种器高速作业的要求,以增加充填力的方式对立式圆盘排种器进行改进,设计了一种利用重力与离心力以及种子间相互作用力作为复合力进行充种的双腔立式浅盆型复合种盘机械式精密排种器,并对排种盘的特征参数进行了优化。利用离散元仿真分析软件EDEM对立式浅盆型种盘进行了以排种盘直径、折边倾角、作业速度为影响因素,充填率为性能指标的三因素五水平二次正交旋转组合仿真设计,并运用Design-expert 8.0软件对数据进行了处理,获得了排种盘最优的结构参数组合,同时利用物理样机试验进行了验证。研究结果表明:立式浅盆型种盘的最佳结构参数组合为排种盘直径234mm、折边倾角68°,在8 ~12km/h高速作业时,合格率均能达到90%以上。研究结果为产品定型提供了定量的依据。 相似文献
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《Measurement》2014
The objective of the study was to determine the seed spacing uniformity performance of a precision metering unit when vacuum plates with different number of holes were used. In order to meet this objective, the performances of vacuum plates with different number of holes were evaluated in the laboratory conditions by employing sticky belt tests and seed spacing values were measured computerized measurement system (CMS) for the cotton and corn seeds. Quality of feed index, multiple index, miss index as well as coefficient of precision (CP3) were considered as the performance indicators for precision seeding. The forward speed values were as selected as 1.0, 1.5 and 2.0 m s−1 while vacuum plates with hole diameter of 3.5 mm for cotton and 4.5 mm for corn seeds were used. For both, cotton and corn seeds, five different vacuum plates (20, 26, 36, 52, and 72 holes) were considered in the experiments. In the experiments, vacuum pressure was applied at 6.3 kPa. Based on the findings in this work it appears that 1.0 and 1.5 m s−1 of forward speed values were found to provide the highest performance levels for all vacuum plates. However such performance substantially decreased when forward speed increased to 2.0 m s−1. In overall, the highest performance was determined when 26 and 36 holes were used for cotton and corn, respectively. 相似文献
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手提式玉米播种机是目前应用比较广泛的播种设备,而排种装置则是手提式播种机控制播种精度的重要部件。对排种装置进行了详细的设计,具有单籽、双籽、三籽可控的排种装置设计特点,通过实验数据优化了排种轮型孔的尺寸,有效地解决了卡籽漏籽的现象。 相似文献
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Combining intensity, edge and shape information for 2D and 3D segmentation of cell nuclei in tissue sections 总被引:3,自引:0,他引:3
C. WÄHLBY I.-M. SINTORN F. ERLANDSSON G. BORGEFORS & E. BENGTSSON 《Journal of microscopy》2004,215(1):67-76
We present a region‐based segmentation method in which seeds representing both object and background pixels are created by combining morphological filtering of both the original image and the gradient magnitude of the image. The seeds are then used as starting points for watershed segmentation of the gradient magnitude image. The fully automatic seeding is done in a generous fashion, so that at least one seed will be set in each foreground object. If more than one seed is placed in a single object, the watershed segmentation will lead to an initial over‐segmentation, i.e. a boundary is created where there is no strong edge. Thus, the result of the initial segmentation is further refined by merging based on the gradient magnitude along the boundary separating neighbouring objects. This step also makes it easy to remove objects with poor contrast. As a final step, clusters of nuclei are separated, based on the shape of the cluster. The number of input parameters to the full segmentation procedure is only five. These parameters can be set manually using a test image and thereafter be used on a large number of images created under similar imaging conditions. This automated system was verified by comparison with manual counts from the same image fields. About 90% correct segmentation was achieved for two‐ as well as three‐dimensional images. 相似文献
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精密排种器的集成分析设计系统开发研究 总被引:10,自引:0,他引:10
采用离散元法研究了散粒物料之间、散粒物料与农业机械工作部件之间的相互作用以及散粒物料的流动过程,提出了由农业机械工作部件计算机辅助设计模型建立其离散元法分析模型的方法。在此基础上实现了计算机辅助设计软件与离散元法性能分析软件的集成,由此开发出了一种播种机精密排种器的集成分析设计系统。介绍了精密排种器离散元法分析模型的建立、种子的生成、邻居搜索与接触判定、数据传递及软件集成方法。最后,通过实例验证了系统的可行性。 相似文献