共查询到20条相似文献,搜索用时 78 毫秒
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在分析小型液压挖掘机履带行走装置性能参数基础上,根据相关参数的数据统计结果给出了其相应的推荐范围,并总结了履带行走装置设计参数的确定方法,为小型液压挖掘机履带行走装置的设计提供了参考。 相似文献
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介绍了ZLG22型折塔式螺杆桩机履带行走装置的结构组成、工作原理、主要技术参数的选择及结构特点。该螺杆桩机履带行走采用电动控制,行走平稳;履带伸缩采用单油缸液压控制,结构紧凑,运输方便,操作运转灵活。 相似文献
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履带行走装置是在承受机重、作业载荷和运行中产生的冲击振动等情况下工作的,直接受到土壤、砂石的磨损和泥水、尘土(有时还有渗漏的油料)污染侵蚀,工作条件比较恶劣,这就使得组成履带行走装置的各构件易于受到较严重的损害。据统计,一部推土机从新车启用到报废的全部修理费中,工作装置和履带行走装置的修理费用就高达70%,而履带行走装置零、构件的修理和更换的费用又占其中较大比重。故延长履带行走装置的使用寿命,特别是研究土壤、砂石对其磨损的形态和影响,以及提出相应对 相似文献
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铣刨机履带行走系统一般有4条履带,且每条履带较短,没有托链轮,支重轮的布置受到整机履带行走系统结构的限制,特别是受到履带张紧装置的限制.以CLG568型铣刨机为例对铣刨机支重轮的设计进行分析.认为支重轮的设计要以支重轮的静态受力、动态受力和铣刨机的最大行走速度为条件.对支重轮中的重要组成零件如:轮体、轴、轴承和浮动密封圈进行设计时,应该充分考虑各个零件之间的相互影响.轮体设计最重要的参数是直径,轮体的直径越大支重轮的转速越低,支重轮的转速越低,它的磨损越少、发热量越少.轴的设计应以支重轮的动力受力为条件,进行强度设计,在满足强度设计的同时,应该有足够的刚性,同时,应该合理设计轴和滑动轴承的配合,以便得到理想的油膜厚度.浮动密封圈的选用非常重要,必须符合高温工况的要求.支重轮的装配要注意3点:①零件必须清洁干净.②浮动密封圈不许有气孔、划伤等缺陷.③润滑油用量准确:量多了不利于散热,量少了不利于润滑. 相似文献
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履带装置的应用已十分广泛.因使用环境的不同,履带板的结构形式也会发生变化.在常见各类机械装置中含链轨的履带结构,有关履带板安装方向介绍的文章甚少,国外相关的论著也并不多见.对同一履带板不同的安装方向进行了分析研究,指出:当履带总成的安装方向发生改变时,在设备行走时,必然会引起额外功耗的增加,也违背了节能降耗的宗旨,应当引起足够的重视. 相似文献
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详细地论述了绞刀螺旋升角与真空挤出机的产量、轴向挤泥运动、产品质量及功率消耗之间的关系,介绍了真空挤出机的绞刀组成及其功用,从而归纳出真空挤出机的搅泥绞刀螺旋升角应选用20°~25°,挤泥绞刀的螺旋升角应选用15°~20°。 相似文献
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从分析物体接触相互作用出发,讨论了摩擦角的概念,并按照摩擦平衡问题推导出摩擦自锁的条件,使学生更容易对这两个概念建立一般性的理解,达到灵活运用理论力学知识的目的。 相似文献
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A.Y. Elghazouli C. Málaga-Chuquitaype J.M. Castro A.H. Orton 《Engineering Structures》2009,31(11):2540-2553
This paper deals with the experimental behaviour of blind-bolted angle connections between open beams and tubular columns. A number of connection configurations with different geometric arrangements and bolt properties are examined. The experimental set-up, connection details and material properties are first described. A detailed account of the results and observations from seventeen monotonic and cyclic connection tests is then presented, and the main behavioural aspects are discussed. The specimens include connections with top and seat angles as well as others in which web angles are also incorporated. The experimental results offer direct information on the influence of important geometric and material properties, such as angle dimensions, column face thickness, gauge length and bolt class, on the key response characteristics including stiffness, strength, energy dissipation and failure mechanism. Based on the findings, simplified approaches through which the initial stiffness and yield parameters can be estimated, are assessed. The test results also provide essential data for the future validation of detailed numerical and analytical studies which can be employed for further assessment of the response, with a view to the development of design-oriented procedures. 相似文献
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本文介绍了选择可视角玻璃对光在直线传播过程的控制机理,针对性地探讨了在设计、生产操作过程需要注意的细节,阐述了选择可视角玻璃在建筑玻璃幕墙、门窗以及特殊场所应用过程所带来的窥视、光线控制等性能的优势。 相似文献
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在钢结构工程中经常采用等边或不等边单角钢作为轴心受压构件,现行钢结构设计规范(GB50017—2002)提供了等边单角钢压杆的截面类别及稳定计算方法,但对不等边单角钢压杆的规定相对粗糙。本文根据弹性稳定理论和角钢截面特征规律,推导了等边及不等边单角钢轴心受压构件的屈曲条件和长细比简化计算方法,并给出了稳定设计方法。扭转屈曲换算长细比仅与角钢肢宽与肢厚的比值有关,这使得弯扭屈曲换算长细比的计算也进一步简化。经过验证,该方法简单实用,可供工程设计参考。 相似文献
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Considerations of the dilatancy angle in rocks and rock masses 总被引:2,自引:0,他引:2
The present study responds to the poor treatment given to dilatancy in classical rock mechanics post-failure problems such as tunnel or mine pillar design. A comprehensive review of the literature and observations in regard to published test results would indicate that dilatancy is highly dependent both on the plasticity already experienced by the material and confining stress; moreover, it also appears that scale may play a non-negligible role. In our article, we provide a detailed analysis of published test data with a view to proposing a sufficiently significant but conveniently simple formulation of the dilatancy angle that reflects these dependencies and that can be readily implemented in numerical codes. The model is then tested, demonstrating that it is capable of representing rock sample strain behaviour in compressive tests. Finally, the model is applied to the resolution of ground reaction curves for tunnels in poor-to-average-quality rock masses, showing a good correlation with results obtained using practical rock engineering techniques. 相似文献