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1972年8月在“加拿大贸易展览会”上Hydomach公司展出了一台TRI-TRUCK型全液压三轮式三用自卸矿车。其行走机构采用了芬兰制造的“SISU”型内曲线低速大扭矩液压马达。 SISU型液压马达,是专供液压汽车、轮 相似文献
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四轮一带的维修费用高,正确的选择使用和维护,能够显著降低机械的维修费用;本文介绍了履带的正确选择,履带式机械的正确操作使用以及四轮一带正确的维护方法. 相似文献
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自溜运输是利用矿车本身重力,沿轨道自动滑行的一种运输方式。仅需矿车、轨道和高差补偿器构造简单的设备,矿车运行速度一般达2 ̄4米/秒。一般情况下,基建投资和生产经营费都低于其它运输。由于自溜运输具有投资少、见效快的优点,因此适于中小型矿山。 相似文献
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双头切机主传动键联接可靠性分析与改进 总被引:1,自引:1,他引:0
针对双刀切机截头机主传动从动带轮普通平键联接失效的问题,运用可靠性设计理论对其进行分析研究,找出了键联接挤压可靠度不足而失效的原因,并提出了解决问题的措施,为建材机械设备的定期检查和维修提供了依据。 相似文献
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水泥电杆模具跑轮磨损问题 总被引:1,自引:1,他引:0
余兆炽 《混凝土与水泥制品》2006,(4):34-36
指出电杆模具跑轮存在夹缝,因而造成不均匀磨损,近缝处磨损得快,远缝处磨损得慢,跑轮逐渐变成椭圆形。根据磨损跑轮运动特性,推算冲击力;探讨了模具跳动的机理。建议密切关注磨损趋势,以容许长短径差设限,超过此限度,即应停用维修。 相似文献
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牙嵌式自由轮差速器具有工作可靠、使用寿命长的特点,被越来越多地应用于各类工程机械,如轮式装载机、大型自卸汽车等。但由于其结构复杂,装配过程繁琐且要求严格,往往使修理后的差速器质量无法把握。如果将维修后的差速器装到机器上检测,拆装相当困难,不仅费时费力,而且可能对机器造成损坏。为了及时准确地了解差速器修理质量的好坏,根据牙嵌式差速器工作原理,我们根据历次修理经验,摸索出一套较为实用的维修检测方法。1牙嵌式自由轮差速器结构及原理牙嵌式自由轮差速器由以十字轴两侧完全对称的部件组成,包括十字轴组件、驱动… 相似文献
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在曲轴连杆液压马达中,连杆底瓦与偏心轮运动副(简称滑靴副)是一对关键磨擦副。为消除滑靴副“烧靴”,偏磨等问题并提高其效率,本文详细介绍了液压马达滑靴副油膜机理试验系统的结构及工作原理,并通过试验研究,对滑靴副侧特性进行了分析。 相似文献
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针对国内普遍存在的轮式工程机械驱动桥主减速器装配时,主动螺旋锥齿轮需要多次拆装调整的问题,提出了一种测量装配方法。该测量装配方法通过模拟还原主减速器主动螺旋锥齿轮配对时的安装距,能够确保主减速器齿轮副一次装配成功,还能够提高主减速器齿轮副的装配精度,延长齿轮副使用寿命。 相似文献
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文章介绍了采用缩小比例的模拟斗齿对小龙潭露天矿的原型煤、泥龙岩等进行垂直层理的直线型切割,通过对参与切割的试样物理、力学参数、切割参数的因次分析,建立无量纲方程,进行相似理论的模型试验和对诸参数组织正交试验,来预测原型斗轮的切割阻力,为设计开发斗轮挖掘机提供理论依据。最后,由整机性能测试来加以验证。 相似文献
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《The IES Journal Part A: Civil & Structural Engineering》2013,6(1):47-58
Pre-stressed concrete sleepers are the main components of railway track systems. To carry and transfer the dynamic wheel loads from the rails to the ground, their current design and construction are limited by allowable flexural stress constraints under service conditions. In current design practice for such a component, the dynamic load effects due to wheel/rail interactions are treated as a quasi-static load using a dynamic impact factor. Then, the allowable stresses eliminate a crack initiation. In reality, the impact events are frequently recorded because of the uncertainties of wheel or rail irregularities such as flat wheels and dipped rails. These effects cause cracking in the concrete sleepers, resulting in excessive maintenance. Limit states design philosophy for the pre-stressed concrete sleepers, containing ultimate and fatigue limit states, has been recently proposed based on structural reliability concept to rationalise the design method and minimise the maintenance. On the basis of probabilistic approach, the high-magnitude low-cycle fatigue limit states, which are more significant in terms of damage evolution, have been addressed in this article. Series of repeated impact tests for the in-situ pre-stressed concrete sleepers were carried out using the Australian largest high-capacity drop weight impact testing machine at the University of Wollongong. The impact forces have been simulated in relation to the probabilistic track force distribution obtained from a heavy haul rail network. This article focuses on the impact responses of the cumulatively damaged sleepers. The effects on such responses of the track environments including soft and hard track supports are also highlighted in this article. It is found that a concrete sleeper damaged by the impact fatigue cycles could possess significant reserve capacity for resisting the axle load in a similar manner as the undamaged sleeper. 相似文献
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Redesigning of the diesel engine turbocharger compressor wheel to improve the low-cycle fatigue life
The compressor wheel of a turbocharger is one of the highly stressed components in automotive engines. The compressor wheel undergoes variations in rotational speed, depending on vehicle operating conditions. These variations cause cyclic mechanical load in the wheel which results in fatigue stress. The continuous operation with fatigue stress results in fatigue fracture and failure. The fatigue is classified as low-cycle fatigue and high-ycle fatigue based on the number of load cycles to failure and type of fracture growth. The present work is focused on the analysis of the compressor wheel that includes measurement of load–time histories in terms of turbocharger speed for different vehicle duty cycles, finite element analysis simulation of stress distribution in the compressor wheel for given load conditions, prediction of fatigue life of the compressor wheel using cumulative damage accumulation theory and the various possibilities for improving the compressor wheel fatigue life. 相似文献
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煤矿生产环境复杂多变,电气设备、电缆种类繁多,电气方面的问题层出不穷。有些问题有规律可循能够迎刃而解,但有一些电气疑难问题还是让煤矿电气维护人员和管理人员很头疼。这不仅关系着煤矿的生产,也给煤矿的安全带来了威胁。 相似文献
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胶带输同在斗挖掘机连续采掘系统中具有重要的作用。文章对小龙潭煤矿胶带机使用中所出现的问题和损坏情况作了分类统计分析;总结了胶带使用及维修管理要点,提出了胶带维修工艺两种方案,并加以对比分析,指出现代化的生产设备必须要有现代化的管理和维修手段配合,才能充分发挥经济效益。 相似文献
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大型煤矿在开挖后,巷道的变形与稳定性变化成为煤矿安全性研究的基础.本文以河南永煤集团地下煤矿综放面布置的具体条件,进行现场实测,根据测量结果对综放回采巷道在围岩开挖过程和回采过程中的岩体表面和内部变形进行了综合研究,从而得出巷道围岩在开挖和回采期间的变形规律.研究结果对改善大型地下工程巷道的维护和煤矿安全生产有着积极的... 相似文献