开关阀

Focused on many problems existing in pressure control system of drilling pipe friction welding,such as high failure rate and poor amenability,the basic principles of friction welding and electro-hydraulic proportional technique were briefly described.

针对焊接钻杆连续驱动摩擦焊机采用开关阀组成压力控制系统存在故障几率高、可控性差等问题，将电液比例控制技术应用在摩擦焊压力控制中，实现了摩擦焊轴向压力闭环控制、滑台进给速度的开环控制；可对摩擦焊机主轴速度、轴向压力、轴向缩短量、主电机电流、油温等进行实时检测。

This paper features the work of rotating platform,to be adopted high-speed switching valve control system to control the rotating platform clockwise and counterclockwise rotation of the reciprocating movement.

本文针对旋转平台的工作特点，拟采用高速开关阀控系统来控制旋转平台的顺时针和逆时针的往复旋转运动。

The rotation,detergence,and valve switching of the water-filter system are full-automatically controlled and, besides,the filter can well deal with the damage of generator set caused by sewage.

本文采用PLC实现新型滤水器，在旋转、排污、开关阀方面实现了全自动控制，并很好地解决了因水质污染对电厂发电机组带来的危害，克服了国内其它形式的滤水器无法解决的有机物过滤排污问题。

E. , large volume of instantaneous flow and fast speed of switch with continuous regulation and lower cost.

针对快压射压射控制的特殊要求，提出一种开关阀和电液比例阀并联的混合式快压射速度控制阀结构，理论证明它可以满足快压射速度控制中瞬时流量大，开关速度快，而且能够连续可调、成本低廉的要求。

This thesis mainly studies the application of the direct digital technology on hydraulic systems, viz.

本文主要研究液压阀的直接数字化控制技术，即高速数字开关阀的相关技术。

Then, according to HVS, the vibrant valve is designed. On the basis of coupling analysis and simulation study of the vibrant valve and the release valve, the simulation curve about the fluid pressure variation in the pile-driving oil pipe is obtained, by which the relationships among the highest pressure value, average pressure value and the pile-driving frequency are obtained.

然后根据液压振动系统设计了振动开关阀，并重点对液压振动系统中的溢流阀和振动开关阀进行了耦合分析和仿真研究，得出压桩油路中流体压力变化的模拟曲线，并根据模拟曲线分析得出流体压力的最高压力值、平均压力值和压桩频率间的相互关系。

The performance of high speed electrohydraulic actuator applied to piston variable displacement compressor was analyzed.

针对高速开关阀流量限制导致的单高速开关阀驱动的电液执行器响应速度慢的问题，在对应用于活塞式变排量压缩机上的高速电液执行器进行性能分析的基础之上，提出了高速开关阀作为先导阀、二级机械阀作为配流阀的方案，建立了数学模型，并进行了仿真。

To improve the response speed of on-off solenoid valve of big flux,detailed analysis on poppet valve is given and an on-off solenoid valve with movement of both spool and cover is designed.

通过对锥阀特性的分析，设计了一种阀芯、阀套同时运动的芯套双动高速开关阀，该阀增大了高速开关阀的开口度，提高了响应速度和流量。

This impulsion tool uses a high speed on-off valve to control to-and-fro motion of the distributing oil valve core, which impels the cylinder rod to-and-fro motion to form impulsion.

此冲击器采用高速开关阀控制配油阀的阀芯往复运动，从而促使活塞杆往复运动形成冲击的工作方案。

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。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷