液压阀块的设计、制造与调试

主要阐述了液压阀块的设计思路、设计中的注意事项以及阀块材料的选择、加工,液压阀块的安装和调试要求。     

跨线管在液压阀块设计中的应用

跨线管在液压阀块设计中的应用缪维平液压阀块在液压系统中得到广泛的应用，其设计直接影响阀块的性能、加工、维护、成本等方面。在实际设计工作中，常由于少数小流量通道无法安排或考虑到难于加工而不得不降低集成度。在本厂新开发的纺织品专用液压打包机产品液压系统的...     

巧用"CAXA实体设计"进行液压阀块设计与加工

在进行液压系统设计中,液压阀块的设计和加工 是一件比较麻烦的事情。因为要把多种液压阀、接头和 开关,安装在一个金属(钢)长方体即阀块上,还要根据 液压系统回路图,把这些阀、接头、开关的相关工作口 (孔)在阀块内部连通。图1是一个小型液压系统,其中     

Inventor软件在液压阀块中的设计应用

随着液压系统的复杂程度的提高,液压阀块的设计难度也在增大。文中引入Inventor三维设计软件对液压阀块进行设计,使阀块转换为可视、可分析、可修改、可进一步模拟加工的实体模型,并通过软件直接生成与实体模型相关联的工程图。     

浅谈液压阀块的数控加工中心加工

液压阀块作为液压阀的重要组成部分,在液压系统中的重要性逐渐被人们认识,其应用范围也越来越广。本文以江苏省泰州技师学院为协作单位加工的一种液压阀块为例,分析阀块的加工工艺、工装夹具的设计、刀具的选择及编程等问题,解决阀块在生产中的效率、成本、尺寸精度和孔系位置等一系列难题。     

液压阀块的设计

阀块在液压系统中是十分常见且非常重要的元件，具有结构紧凑，维护、安装、调整和更换液压元件方便等特点。一般液压阀块内部的油孔采用钻、镗等加工方法。有时，为了避免各油孔之间相互干涉，必须使用工艺油孔，这样便增加了液压阀块内部油孔的复杂性，采用机械加工的方法一般不能形成流线型油孔，直角转弯油孔较多，从而导致结构复杂。本文介绍了2种液压阀块设计方法。     

用计算机造型系统设计液压阀块

介绍了液压阀块设计系统的二维输入与三维设计之间的关系。通过改造实体造型的数据结构来表现液压阀块的结构造型,而阀块内部结构可以通过生成截面图来表现。     

CATIA在液压阀块设计中的应用

阐述了液压阀块设计原则与设计步骤,着重叙述了应用CATIA V5软件设计液压阀块的方法,结合实例运用该软件,提高了工作效率与可靠性。     

液压集成块裂纹修复

随着液压技术不断向前发展,液压设备中集成块的应用越来越普遍,尤其是在大中型企业中更有其使用价值。真主要原因是几个板式液压阀安装在同一阀块上,使整个液压阀组系统结构紧凑,占地面积小,集成化程度高。由于液压阀块孔道间相互交错,当电磁换向阀频繁换向时,使浊液速度突然发生变化,使管道或阀块内油液压力在某一瞬间急剧上升,形成一个液压峰值,导致液压阀块疲劳产生裂纹。由于液压阀块是采用高强度球墨铸铁加工制造,其主要优点是减振性能好,但由于液压阀块加工工艺复杂,加工精度高,我厂采用粘合技术对其裂纹进行修复。首先把液压阀块油污清洗干净并烘干,然后将阀块裂纹处重新扩孔车螺纹(规格M36×1.5),并重新加工一     

液压集成块三维设计方法研究

针对液压元件技术的快速发展,提出一种可适用于板式阀、二通插装阀、叠加阀和螺纹插装阀混用的液压集成块三维设计方法。根据各类阀的结构特点和安装使用方式,构造了相应的液压阀布局设计方法;从集成块设计角度,将液压阀油孔分为底面油孔和侧油孔,从而涵盖了四类液压阀在液压集成块设计过程中的各种油路连通方式。     

Solid Works在液压阀块设计中的应用

阐述了液压阀块的设计原则,着重叙述了应用Solid W orks软件设计液压阀块的方法,结合实例运用该软件,提高了工作效率与可靠性。     

液压流道局部拓扑优化与增材制造

液压阀块是液压系统的重要组成部分,降低液压阀块的压力损失对实现液压系统节能化、提高功重比意义重大。选区激光熔化(Selective Laser Melting, SLM)技术是一种增材制造(Additive Manufacturing, AM)技术,基本突破了减材、等材等传统加工方式的设计约束,结合拓扑优化方法,可大大提高液压阀块及其流道的设计自由度。以降低流道局部压力损失为研究目标,对流道局部压力损失较大的拐弯处进行拓扑优化设计,并采用SLM技术成形,优化设计后流道的压力损失明显降低。进一步探究弯管压力损失的主要影响因素——迪恩涡,定量分析了拓扑优化流道降低压力损失的原理,结果表明,拓扑优化得到的变截面流域通过改变流域的弯曲程度,使迪恩涡对压力损失的影响降到最小,从而有效降低流域内的压力损失。对增材制造液压元件及其流道的设计具有重要指导意义。     

一种自诊断型阀门执行机构的设计

自诊断阀门执行机构采用PID控制算法为理论模型,以单片机AT89C55WD为控制核心,引入电流传感器不间断检测电机电流,经A/D转换送单片机,通过单片机的实时监测功能判断阀门的运行状态,完成了自诊断阀门控制器的硬件设计和软件设计.     

管道水击现象对止回阀设计的影响

止回阀一般安装在流体输送机泵出口管道及防止流体逆流的管道上，通过对管道系统中的止回阀在下游阀门短时间内关闭时的水击模拟分析，提出在止回阀设计中应考虑水击压力对阀门过载和疲劳破坏的影响以及止回阀结构对管道系统产生水击的作用。     

基于增材制造的液压阀块流道过渡区优化研究

器件小型化和集成化发展趋势,对液压阀块设计提出了更高的要求.传统工艺加工阀块体内部流道,不但工艺复杂难加工,而且成形的流道流动特性有待提高.新型制造工艺增材制造一体化成形的特点使其在流道加工方面表现出很大的优越性.基于增材制造,对某一液压集成阀块的流道过渡区进行优化设计,利用Fluent仿真,对直线过渡、圆弧过渡、B样...     

螺纹插装阀的应用与注意事项

介绍了螺纹插装阀的一般应用与设计加工调试相应集成块时的一般注意事项。     

Influence of the flow area around the ball valve on the flow characteristics of the injector control valve

The increase in common rail pressure can lead to increased cavitation inside the injector, resulting in degradation of injector performance and reduced life. The paper investigates the effect of the pressure block structure parameters (initial flow area around the ball valve) on the velocity field, pressure field, fuel gas phase volume fraction and drain rate of the control valve. The relationship between the initial flow area around the ball valve on the cavitation strength and unloading rate inside the valve was revealed. The results show that both the reduction of the flow area around the ball valve and the increase of the cavitation intensity inhibit the rate of oil discharge from the control valve. The reduction of the fuel flow area inhibits the expansion of the low-pressure region (0–1 MPa) within the flow layer, thus limiting the development of cavitation. The reduction of the cavitation area increases the fuel flow rate, however, the increase in flow rate increases the cavitation phenomenon, and these changes form a cycle (Reviewer 5. comment 2). The increase in cavitation inhibits the control valve pressure relief rate more significantly than the decrease in the initial flow area around the ball valve. Based on this, a stepped-pressure block model is proposed. The stepped pressure block model can effectively reduce the cavitation strength near the seal and enhance the oil discharge rate of the control valve. The study can provide a reference for the engineering optimization design of high-pressure common rail injector control valves.     

Measurment of fluid film thickness on the valve plate in oil hydraulic axial piston pumps (Part II: Spherical design effects)

Tribologtcal characteristics in the sliding parts of oil hydraulic piston pumps are very important in increasing overall efficiency In this study, the fluid film between the valve plate and the cylinder block was measured by using a gap sensor and the mercury-cell slip ring unit under real working conditions To investigate the effect of the valve shape, we designed three valve plates each having a different shape One of the valve plates was without bearing pad, another valve plate had bearing pad and the last valve plate was a spherical valve plate It was noted that these three valve plates observed different aspects of the fluid film characteristics between the cylinder block and the valve plate The leakage flow rates and the shaft torque were also investigated in order to clarify the performance difference between these three types of valve plates From the results of this study, we found that the spherical valve plate estimated good fluid film patterns and good performance more than the other valve plates in oil hydraulic axial piston pumps     

Experimental and Analytical Investigation of Floating Valve Plate Motion in an Axial Piston Pump

The purpose of this investigation was to experimentally measure the motion of the floating valve plate in an axial piston pump under various operating conditions and to develop a model to determine how the floating valve plate motion affected the lubricating pressures between the valve plate and cylinder block. In order to achieve the objectives, a hydraulic circuit was designed and developed to incorporate and operate a floating valve plate axial piston pump. The hydraulic circuit integrating the axial piston pump (axial piston pump apparatus, APPA) consists of a series of valves, pressure sensors, a charge pump, flow meters, temperature sensors, a heat exchanger, and proximity probes. The floating valve plate axial piston pump housing was modified to incorporate three proximity probes to measure the valve plate position and motion relative to the cylinder block, thus allowing for determination of the film thickness within this contact. The results illustrate that as the pump starts up the valve plate experiences vibrations and begins to lift relative to the cylinder block. Then as the pump reaches steady-state operation the valve plate achieves a fixed position and tilt. The results also demonstrate that under steady-state operation, the valve plate vibrates and this vibration correlates well with the speed and the number of pistons in the pump. The measured film thickness results were then used in a lubrication model to determine the pressures generated between the floating valve plate and the cylinder block. The analytical results highlight how the motion of the valve plate directly correlates to the pressure pulsations seen in the lubricating gap.