集装箱正面吊转向系统原理及常见故障排查办法

<正>集装箱正面吊的转向系统对其行驶安全至关重要,若转向系统出现故障,往往会造成重大的事故。本文以DRF400-450型卡尔玛集装箱正面吊为例,介绍全液压转向系统的工作原理及常见故障的解决方法。1.工作原理全液压转向系统巾液压泵1、优先阀2、梭阀3、转向器4、转向阀5、转向缸6以及扪关     

矿用运输车辆全液压转向系统设计与应用

该文针对矿井下特殊的工作环境,介绍了全液压转向的4种转向控制方式,分别说明了助力转向、全液压转向、流量放大器转向和多路阀控转向的工作原理、特点,结合生产厂家给出的转向元件的具体参数以及实际工况给出了选型设计计算,具体指出了各转向形式的适用范围,选型匹配时的注意事项,总结了全液压转向系统的设计方法,为矿用车辆转向系统的设计选型匹配提供一套行之有效的方法及经验。     

流量放大阀在全液压转向系统中的应用

简单介绍了全液压转向系统的工作原理。对于大型机械转向力要求大而流量过小,转向达不到要求,该文应用流量放大阀很好地解决了这一问题,重点介绍流量放大阀的结构及工作原理。     

基于AMESim全液压转向系统的建模与分析

针对定量泵构建的全液压转向系统工作时传动效率低、压力和流量损失严重等问题,将负载敏感式变量泵技术应用到全液压转向系统中。对转向系统中转向器、优先阀及负载敏感式变量泵的结构进行了详细阐述;利用AMESim仿真软件对转向系统进行了建模;基于AMESim仿真模型对负载敏感式全液压转向系统进行了仿真分析。研究结果表明:转向器转速在30 r/min和40 r/min时,压力和流量输出相对稳定;优先阀对转向器可起到流量调节作用;负载敏感式变量泵倾斜角在20°内能够控制输出流量的大小;负载敏感式全液压转向系统能够最大限度地减少压力和流量损失,从而提高传动效率。     

全液压转向器几种常见故障的处理

工程机械底盘的前轮转向多采用全液压转向器。全液压转向系统主要由转向器、流量控制阀、转向液压缸等组成,利用转向盘操纵转向器实现前轮转向。附图为BYZ－320转向器的结构图。转向器结构图互阀体2．阀盖3．连接块4．定位蝶式弹簧5．拨销6．单向阀7溢流问8．隔盘9．端盖...     

大型工程机械车辆液电转向技术

工程机械的转向方式通常采用全液压转向技术。以装载机为例 ,目前均为液压伺服转向技术和液压负载优先伺服转向技术。前者由液压泵、液压单路稳流阀、液压伺服转向器、安全阀块及液压缸组成 ,如图 1所示。液压单路稳流阀的主要作用是保证车辆在发动机的转速变化时 ,转向器所需要的油量始终恒定 ,使转向操纵作业不受发动机转速变化的影响。但是系统流经液压单路稳流阀超过 5 0 %的液压油没有作功就返回至油箱 ,能量消耗较大。后者采用液压负载优先伺服转向技术将液压负载转感系统集成至全液压转向器上 ,可减少转向系统的功率消耗达 30 %左右 …     

装载机转向失灵

一台厦工产ZL50型装载机转向时,转向泵发出啸声,泵体过热,振动过大,有时不能转向,更换新的转向泵后,故障依然。ZL50型轮式装载机由于质量较大,为使操纵轻便,一般都采用全液压流量放大转向系统。未出现全液压转向以前,我国第一代ZL50型装载机全都采用螺杆螺母循环球式直接带动转向阀的机械式转向系统,并设有带随动杆的机械反馈。该机械式转向系统与全液压转向系统相比,转向力及油压损失都较大,且可靠性也差。该型装载机转     

先导供油方式对装载机转向液压系统性能的影响

转向快速轻便、节能和操作舒适安全是转向液压系统的发展趋势,大型装载机转向液压系统多采用由全液压转向器和流量放大阀构成的两级液压放大系统,先导供油回路是转向液压系统的重要组成部分,通过理论分析和试验揭示了先导泵供油和减压阀供油方式的特点及其对转向液压系统性能的影响,并提出了相应的解决方案.     

GJW111型挖掘机转向辅助器的正确拆装

GJW111型挖掘机采用全液压转向系统。该系统主要由油箱、齿轮泵、流量控制阀、转向辅助器、转向缸等部件组成。其中,转向辅助器经常因拆装不当而发生损坏。遵循一定程序拆装并进行必要的试验,可确保使用质量。     

防爆无轨胶轮车全液压转向系统的仿真与实验分析

该文介绍了某型号矿用防爆胶轮车的总体方案及结构参数,以及采用全液压转向系统的工作原理图。以该型号矿用防爆无轨胶轮车液压转向系统为研究对象,对负荷传感全液压转向系统的动态模型进行仿真,并进行试验验证,从理论和实验上验证了该转向系统的可靠性,结果表明负荷传感全液压系统响应速度快、能量损失小、系统稳定性良好的特点。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...