機械外文翻譯---液壓機-液壓系統(tǒng)-在線瀏覽
2025-03-24 06:14本頁面
【正文】 ess a liquid. You can press a gas (think about putting more and more air into a tire, the more you put in, the higher the pressure). If you39。re really strong you ca n press a solid mass as well. But no matter how much pressure you apply onto a liquid, it isn39。s. Hydraulic jacks were used to level the tower and align the metal girders to an accuracy of 1 millimeter。s brakes and how, by stepping on the brake pedal, you apply stopping pressure on the brakes on all four wheels. Physics Basic physics tells us that we can trade off force for distance in all mechanical systems. In a hydraulic system, we do this by changing the relative size of the pistons at each end of the system. For example, a small piston moving a relatively large distance (say a foot) will exert pressure on a larger piston at the other end. The force will be enough to move a heavy weight a small distance (much less than a foot). Engineers and physicists can calculate exactly how much distance needs to be traveled and the relative sizes of the pistons required to move a particular weight. Hydraulic Engines Water falling from one level to a lower one is used to drive machines like the water wheel and the turbine . The difference in height between the highest and the lowest level is called the head。 Where no natural sources are available, an artificial reservoir can be made. When energy is plentiful, it is used to pump water into the reservoir。 the cylinders are connected by a pipe also filled with the liquid. One cylinder is of small diameter, the other of large diameter. According to Pascal39。s law, is used to exert large forces or to lift heavy loads. Like the hydraulic press it consists essentially of two differentsized pistons contained in cylinders that are connected by a pipe. When the smaller piston is moved back and fort
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