液压

The math model of the movement,flux and control system of position pump was established by analyzing its working principle,and its hydraulic system simulation model was established based on AMESim.The pressure and flux pulsation of the position pump was analyzed,and the pressure and flux was calculated by simulation when there are sign of wear for the position pump and system flux change.

分析了恒压力轴向柱塞泵的工作原理，推导并建立了液压泵压力流量和压力调节机构的数学模型，并在此基础上以AMESim工程软件为平台建立了轴向柱塞泵的仿真模型，分析了压力流量脉动状况并对液压泵在内部磨损和系统流量变化两种情况下的压力流量进行了仿真计算，对两种情况下泵的工作情况进行分析比较，为液压脉动抑制和故障分析提供了参考。

Engineering College, Air Force Engineering University, Xi'an Shaanxi 710038, ChinaAbstract: The math model of the movement, flux and control system of position pump was established by analyzing its working principle, and its hydraulic system simulation model was established based on AMESim. The pressure and flux pulsation of the position pump was analyzed, and the pressure and flux was calculated by simulation when there are sign of wear for the position pump and system flux change.

分析了恒压力轴向柱塞泵的工作原理，推导并建立了液压泵压力流量和压力调节机构的数学模型，并在此基础上以AMESim工程软件为平台建立了轴向柱塞泵的仿真模型，分析了压力流量脉动状况并对液压泵在内部磨损和系统流量变化两种情况下的压力流量进行了仿真计算，对两种情况下泵的工作情况进行分析比较，为液压脉动抑制和故障分析提供了参考。

This test platform may separately test performance parameter of the hydraulic pump, the hydraulic cylinder and the hydraulic valve.

本试验台可以分别测试液压泵、液压缸和液压阀的性能参数，与专用试验台相比，具有一机多用的优点。

Our years of experience in the production of hydraulic system, combined with RISUN performance characteristics of hydraulic parts, my company has developed a dedicated hydraulic pump drill grinding machine, drilling machine pumps, foam machine pumping station, pumping station dedicated machining centers, CNC lathe dedicated pumping station, pumping station and glass machinery dedicated straightening machine dedicated servo pump stations and other products by the vast numbers of users.

秉承多年的液压系统制作经验，结合RISUN液压件的性能特点，我公司开发了磨床专用液压泵钻、加工机床专用泵钻、发泡机专用泵站、加工中心专用泵站、数控车床专用泵站、玻璃机械专用泵站和校直机专用伺服泵站等多个系列产品，深受广大用户的欢迎。

Today approval requirements are so stringent that well over 50 separate rig and bench tests are required to evaluate the performance of candidate hydraulic oils during development.

在壳牌新一代得力士液压油的研发过程中，每个候选配方均需要完成50个以上的台架和对比试验，对其性能进行评估，以确保壳牌新一代得力士液压油获得所需的液压设备制造商的批准认可。

The pipe string includes double hydraulic cylinder with anchorage packer、double hydraulic cylinder without anchorage packer、releasing tool、reversing valve and centralizer.

该工艺管柱主要由双缸液压锚定封隔器、双缸液压无锚定封隔器、液压丢手工具、换层开关、扶正器等工具组成。

In chapter 2, the shortcomings of Innas HT are analyzed. A new structure of the HT is proposed to expand the output pressure scope. The pressure fields between the cylinder block and the valve plate and between the valve plate and the end housing have been set up, and the HT is designed and checked. The computational results meet the requirements of the optimum distribution and strength.

第二章，对Innas液压变压器存在的缺陷进行了分析；为拓展液压变压器的调压范围，提出了一种新型结构，并进行结构设计；建立了缸体-配流盘之间，配流盘与后端盖之间的压力场数学模型，并据此对液压变压器进行设计与校核，计算结果满足最佳配流和强度要求。

The model of a hydraulic system composed of fluid resistance, fluid capacitance and on/off valve is analyzed. Dynamic model considering fluid resistance and fluid capacitance are set up for on/off valve. Bloc diagram of simulation modules of the hydraulic system is worked out with Matlab/Simulink. The system is simulated through different parameter settings. Influences of fluid resistance and fluid capacitance on flow characteristics of on/off valve are qualitatively analyzed.

对液阻、液容和关阀组成的液压系统进行模型分析，建立了考虑液阻、液容的开关阀动态模型，并利用Matlab/Simulink建立了液压系统仿真模块图，通过设置不同参数对开关阀液压系统进行仿真，定性地分析了液阻、液容对开关阀流量特性的影响。

As the "Hydraulic safety Closed Spring Loaded Low Lift Type-High Pressure Safety Valve valve," has two levels pressure relief function and pressure from low to high pressure limiting function; with limited pressure relief and anti-corrosion properties of good stability and reliability advantages of the patented product may greatly enhance and expand power systems and hydraulic equipment hydraulic mine support equipment, quality and performance.

由于&气动液压安全阀&具备二个级别卸压功能和从低到超高压力的限压功能；具备限压卸压稳定可靠和防腐性能好的优点，本专利产品可极大地提升和拓展液压动力系统和液压设备矿井支护设备的品质和性能。

The main products include: hydraulic bending track machine, rail Shuang'gou bending machine, vertical bending track machine, Calibration machines, extrusion hole machine, from Road machine, reset machine, electric saw track machine, adjust gauge, and tub of plastic machines, ching car machine, alignment machine,machine, electro-hydraulic putt, pumping stations, such as hydraulic mining machinery and maintenance tools.

主要产品有：液压弯轨机、双沟弯轨机、垂直弯轨机、校正机、挤孔机、起道机、复位机、电动锯轨机，轨距调整器，矿车整形机，清车机、校直机、拨轮机，电动液压推杆，泵站等矿山液压机械及维护工具。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。