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根据旋耕机的工作条件及旋耕刀片的工作环境,针对旋耕刀片易磨损的特点,提出了用新材料--贝氏体钢来代替现行的65Mn钢,得出了Mn-B系贝氏,体钢铸造旋耕机刀片的推广应用将会有显著的经济效益的结论。 相似文献
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正横轴式旋耕机由工作部件、传动部件和辅助部件构成。工作部件包括刀片、刀座和刀轴,传动部件包括万向节、传动轴和齿轮箱,辅助部件包括悬挂支架、挡泥板、平土推板等。辅助部件主要依靠外协件厂提供,出现故障时一般只能返厂维修或更换新件。现重点介绍工作部件和传动部件的故障维修方法。1旋耕刀片故障分析及处理刀辊是旋耕机的主要耕作部分,旋耕刀是刀辊的前端受力部件,若耕作过程中旋耕机异常跳 相似文献
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根据笔者的工作实践,在使用旋耕机中应注意以下 9点: ( 1)出车前应检查万向节两端的五根插销是否装好,刀轴和刀片是否变形,刀片是否紧固齐全。 ( 2)旋耕时应先接合动力输出轴,再挂上工作档,柔和松放离合器,同时操纵液压升降手柄,使旋耕机刀片逐步入土,随之加大油门,直到正常耕深为止。禁止在机组起步前将旋耕机先入土或猛放入土,以免使拖拉机熄火和损坏旋耕部件。 ( 3)旋耕时,万向节的倾角不大于 15°;地头转弯不切断动力提升时,倾角不大于 30°,并应减小油门以降低刀轴转速。 ( 4)地头转变或倒车时,必须提起旋耕机… 相似文献
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正反转旋耕灭茬机刀片的功耗分析 总被引:5,自引:0,他引:5
旋耕机是一种应用非常广泛的耕耘机械.人们目前使用的大部分都是正转旋耕方式和正转刀片,对反转旋耕方式及其刀片的研究相对较少,并且对其中的一些性能和适用条件尚未完全了解.为此,分析了旋耕过程中不同的旋耕方式对于旋耕功耗以及各种负荷的影响,提出了在一定渠道条件下的旋耕方式,为设计出合理的刀片形状提供理论依据. 相似文献
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旋耕机常见故障及排除方法 总被引:1,自引:0,他引:1
1、旋耕机负荷过大(:1)旋耕深度过大,应减少耕深;(2)土壤粘蚕、过硬,应降低机组前进速度和刀轴转速,轴两侧刀片向外安装将其对调变成向内安装,以减少耕幅。2、旋耕机后间断抛出大土块:(1)刀片弯曲变型,应校正或更换;(2)刀片断裂,重新更换刀片。3、旋耕机在工作时有跳动:(1)土壤 相似文献
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(1)旋耕机负荷过大,原因是耕深过大或土壤粘度大、土壤硬度高。排除方法:减小耕深或换低档作业;刀轴两侧刀片向外安装时,可将其对调变成向内安装,以减少耕幅。 (2)旋耕机在工作时跳动,原因是土壤过硬或刀片安装不正确。排除方法:降低机组前进速度,检查调整或重新安装刀片。 (3)旋耕后,有大土块,原因是刀片弯曲变形或刀片断裂、脱落。排除方法:矫正或更换刀片,脱落的重新安装。 (4)旋耕后地面不平,原因是旋耕机未调平、拖板位置安装不当、机组前进速度与刀轴转速配合不当。排除方法:重新调整机组,改变机组与刀轴的速 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