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蒋达人 《拖拉机与农用运输车》1984,(2)
<正> 认真贯彻国家标准是提高作业质量、保证拖拉机-悬挂犁机组正常工作的有效措施。这里谈的是拖拉机和悬挂犁的正确挂结配套问题。 问题是由使用部门提出的:为什么拖拉机带悬挂犁耕地时,有时犁不能入土,从而 相似文献
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悬挂犁耕机组耕深自动控制的研究 总被引：1，自引：0，他引：1
悬挂犁耕深的自动控制是农机自动化的重要内容之一.为此,以黄海-304拖拉机悬挂三铧犁耕机组为研究对象,用电液比例方向阀替代主控制阀,结合应用传感器检测技术,采用闭环控制的方式来实现悬挂犁耕机组耕深的阻力控制、位置控制、力位综合控制;采用按钮式控制面板代替原有拖拉机复杂的操纵机构,使得对液压系统的操作简单准确,实现了悬挂犁耕机组耕深的自动控制. 相似文献
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一、悬挂犁不入土其原因主要是犁尖过度磨损、入土角过小和土壤硬度过高等。犁尖磨损变钝后要进行修理或更换;入土角过小可调整上拉杆,对于犁柱变形引起的入土角变小,应先修复或更换已变形的犁柱,按规定调整入土角;土壤过硬时,要先耙后耕,或在犁架上加适当配重。二、机组操向困难调整偏牵引的原则是:使土壤作用力的作用线接近或通过牵引中心。当拖拉机向已耕地偏头时,可把悬挂轴相对犁向已耕地移动,这样犁在水平面内的瞬心将移向相反方向,使牵引线通过动力中心成为斜牵引状态。在没有悬挂轴而装有耕宽调节器的犁上,可把左耕宽调节器右移一定… 相似文献
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为确保犁耕作业质量．拖拉机在进行犁耕作业前．必须先下田试耕。在试耕过程中，要注意检查、调整，使悬挂犁具有良好的入土性能、稳定的作业耕幅，耕深能达到要求的标准。 相似文献
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拖拉机犁耕机组的振动分析 总被引：1，自引：0，他引：1
在三维空间建立了拖拉机犁耕机组的线性１０自由度力不数学模型，以实测信号为依据，建立机组的激励谱矩阵，探讨了在同时受车轮位移激励和犁的外力激励时机组动态响应的计算方法，分析了犁耕机组的振动特点。 相似文献
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铧式犁与拖拉机组成的犁耕机组是目前水旱田均采用的主要耕地机具,铧式犁的入土性能关系到耕地作业质量和效率。本文就有关教材中影响铧式犁入土过程性能的诸因素及其表述作一些分析和讨论。 相似文献
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《Agricultural Water Management》2001,48(3):239-253
Mole drains in flood irrigated agriculture can rapidly fail due to high flows of irrigation water entering the mole channel through the soil cracks formed during the moling process. Currently mole drains are formed using a straight leg mole plough that results in rapid irrigation water flow to the mole drain. The use of an angled leg mole plough to reduce the direct inflow of irrigation water and produce more stable mole channels was investigated. The leg of the angled leg mole plough comprised an upper vertical section to which an angled section carrying the mole foot was attached at a 30° angle. The trials were carried out on two contrasting clay soils in a flood irrigated area. One of the soil types was structurally stable on wetting, the other unstable. The quality of the mole channels formed at installation using the straight leg plough was good, but using the angled leg plough were only moderate due to some instability problems with the equipment. This was caused by the mole foot pitching and thus forming an oval channel.After installation, irrigation was applied to the mole channels to ascertain their stability on wetting. The angled leg moles proved more stable than the straight leg moles in the unstable soil. This was due to reduced water flow rates into the channel causing less erosion and to the prevention of the leg slot opening up directly into the mole channel, through shrinkage, during dry periods. The latter prevented significant soil wash and ingress into the channel during the following irrigation. This improved stability is of significant importance in that it may allow the adoption of mole drainage on sodic and swell/shrink soils where previously mole drainage would have been ineffective.In the structurally stable soil, the stability of the angled leg moles was found to be slightly worse than those installed with the straight leg plough. This was probably due to inadequate soil packing in the channel roof during installation.The trial results indicate that mole channels installed with angled leg plough have the potential for much greater stability on sodic and swell/shrink soils than moles installed with current straight leg mole ploughs. Before this potential can be fully achieved further development of the mole ploughing technique is required to ensure that high quality moles are consistently formed at installation. Suggestions are made for future improvements to the mole plough and the moling technique. 相似文献
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甘蔗地凿式深松犁角度参数的优化研究 总被引：1，自引：0，他引：1
针对现有甘蔗地深松犁牵引阻力大的问题,通过试验分析优化对深松犁综合性能影响较大的角度因素—犁柄倾角、入土角、入土隙角。采用二次通用旋转组合试验,建立了关键角度参数与牵引阻力之间的数学模型,对试验数据进行通径分析和响应面分析。在保证深松犁作业性能的前提下,确定了犁柄倾角为33°、入土角为25°、入土隙角为6°时为最优的参数组合。田间检验试验结果表明:优化后的深松犁深松性能良好,牵引阻力较低,满足甘蔗地深松技术要求。研究结果可为进一步优化甘蔗地深松机整体性能提供理论依据和数据参考。 相似文献
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悬挂犁传统受力分析方法的质疑和计算机辅助分析 总被引：3，自引：1，他引：3
对悬挂犁受力分析的传统方法提出了质疑，并从理论上分析了存在问题的原因。用解析方法建立了悬挂犁受力方程组，编制了计算机程序，依靠计算结果，探讨了各因素变化对悬挂犁所受作用力和力偶矩的影响。 相似文献
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规模种植条件下玉米茬地平翻整地机组经济性评价 总被引：1，自引：0，他引：1
玉米后茬耕整地是玉米机械化生产过程中的重要环节之一,评价玉米茬地机械化耕整地机组的经济性能对指导农业及农业机械化生产具有重要意义。根据实际调研结果,确定了规模化生产条件下玉米茬地平翻整地工艺过程及完成各项作业的10种适用机组;选择年最大盈利值、投资回收期和内部收益率评价玉米茬地平翻整地各机组的经济性能,给出了各指标的计算模型。评价结果表明:东方红1304拖拉机灭茬机组、CASE210拖拉机耙地机组年收益最大;东方红1304拖拉机起垄机组、CASE210拖拉机平翻机组可获得较高的投资效率。 相似文献