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农用运输车的滚动轴承损坏后,毁坏的保持架、滚动体、内圈拆除易如反掌。而外圈凹陷在机件的某个特殊部位(以小四轮拖拉机、三轮农用运输车的半轴套管外端的轴承为例)拆卸颇为困难。但在机修过程中,笔者总结了以下几种巧妙而省工省力的拆卸方法,在这里与大家共同探讨。 相似文献
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<正>一些小型轮式拖拉机的发动机曲轴是靠两个滚动轴承支撑。滚动轴承由内圈、外圈、滚动体和保持架组成。内圈的外面和外圈的里面有滚道以利于滚动体滚动。内圈和轴配合,外圈和轴承座或箱体配合。通常内圈随轴旋转,外圈不转。曲轴前后主轴颈与滚动轴承内圈固定。后滚动轴承的外圈则用后轴承盖把它固定在机体轴承座孔内,防止轴向移动。前轴承的外圈直接安在机体的座孔内,没有轴向固定,以便在曲轴受热膨胀,向前有轴向伸缩余地。 相似文献
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农⒚运输车的滚动轴承损坏后,毁坏的保持架、滚动体、内圈拆除较为容易;而外圈凹陷在机件的某个特殊部位(以小四轮拖拉机、三轮汽车的半轴套管外端的轴承为例)拆卸颇为困难。在机修过程中,笔者总结了以下几种巧妙而省工省力的拆卸方法,在这里㈦大家共同探讨。(1)钢珠法。将该车损坏轴承滚动体内的3颗钢珠或4颗 相似文献
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S195等柴油机上平衡轴轴承工作中经常被损坏,特别是飞轮侧上平衡轴轴承更易损坏。损坏特征为轴承保持架碎裂,滚珠挤在一边,外圈与内圈脱位甚至产生裂纹。当该轴承损坏后,柴油机工作不平稳,齿轮室内传出“哗——”的响声,加大油门时响声增大,怠速运转时响声较清晰。 相似文献
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变桨轴承套圈承受周期性弯扭交变载荷作用,为使用标准试件研究变桨轴承套圈材料的弯扭疲劳失效,需建立与实际工况等效的试验载荷谱。首先建立了风力发电机桨叶系统的整体力学模型,并研究了变桨轴承套圈承受的周期性外载荷;其次建立变桨轴承的整体有限元模型,研究变桨轴承套圈应力、套圈截面弯矩和扭矩的周期性变化规律;最后通过应力和弯扭载荷特性等效,研究了标准试件试验变桨轴承套圈材料疲劳性能的等效载荷谱。 相似文献
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圆锥滚子轴承自动装配机的研究现状 总被引:1,自引:0,他引:1
圆锥滚子轴承的装配是其制造过程中的重要环节,使用自动装配机完成装配过程可以有效地保证装配质量并提高生产率。简要介绍了圆锥滚子轴承的结构形式及装配工艺过程,阐述了国内外自动装配机的发展现状,分析了圆锥滚子轴承自动装配机研究和应用的制约因素,展望了该项研究的未来发展。 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