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液壓與氣壓傳動(dòng)外文翻譯-文庫吧

2025-09-29 23:20 本頁面

【正文】 tic driver is sometimes used. There is little constructional difference between hydraulic motors and pumps. Any pump may be used as a motor. The quantity of oil flowing at any given time may be varied by means of regulating valves( as shown in ) or the use of variabledelivery pumps. The application of hydraulic power to the operation of machine tools is by no means new, though its adoption on such a wide scale as exists at present is paratively recent. It was in fact in development of the modern selfcontained pump unit that stimulated the growth of this form of machine tool operation. Hydraulic machine tool drive offers a great many advantages. One of them is that it can give infinitelyvariable speed control over wide ranges. In addition, they can change the direction of drive as easily as they can vary the speed. As in many other types of machine, many plex mechanical linkages can be simplified or even wholly eliminated by the use of hydraulics. The flexibility and resilience of hydraulic power is another great virtue of this form of drive. Apart from the smoothness of operation thus obtained, a great improvement is usually found in the surface finish on the work and the tool can make heavier cuts without detriment and will last considerably longer without regrinding. Hydraulic and Pneumatic system Hydraulic System There are only three basic methods of transmitting power: electrical, mechanical, and fluid power. Most applications actually use a bination of the three methods to obtain the most efficient overall system. To properly determine which principle method to use, it is important to know the salient features of each type. For example, fluid systems can transmit power more economically over greater distances than can mechanical types. However, fluid systems are restricted to shorter distances than are electrical systems. Hydraulic power transmission system are concerned with the generation, modelation, and control of pressure and flow， and in general such systems include: which convert available power from the prime mover to hydraulic power at the actuator. which control the direction of pumpflow, the level of power produced, and the amount of fluidflow to the actuators. The power level is determined by controlling both the flow and pressure level. which convert hydtaulic power to usable mechanical power output at the point required. medium, which is a liquid, provides rigid transmission and control as well as lubrication of ponts, sealing in valves, and cooling of the system. which link the various system ponents, provide power conductors for the fluid under pressure, and fluid flow return to tank(reservoir). storage and conditioning equipment which ensure sufficient quality and quantity as well as cooling of the fluid. Hydraulic systems are used in industrial applications such as stamping presses, steel mills, and general manufacturing, agricultural machines, mining industry, aviation, space technology, deepsea exploration, transportion, marine technology, and offshore gas and petroleum exploration. In short, very few people get through a day of their lives without somehow benefiting from the technology of hydraulicks. The secret of hydraulic system’s success and widespread use is its versatility and manageability. Fluid power is not hindered by the geometry of the machine as is the case in mechanical systems. Also, power can be transmitted in almost li

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