機械外文翻譯---液壓機-液壓系統(tǒng)-文庫吧資料
2025-01-27 06:14本頁面
【正文】 larger piston having an area of 50 sq in. would be 2,500 lb (100 50/2 =2,500).However, when the pistons move, the distance the smaller piston travels is proportionately greater than the distance the larger piston travels, satisfying the law of conservation of energy. If the smaller piston moves 25 in., the larger one will only move 1 in. The hydraulic press is used, for example, to form threedimensional objects from sheet metal and plastics and to press large objects. The hydraulic jack, also an application of Pascal39。 the water is then available as a power source to drive turbines when energy bees scarce. In driving certain industrial hydraulic machines an apparatus called an accumulator is employed to supply high power for short periods of time. One type consists essentially of a cylinder enclosing a piston loaded with weights. When water is slowly pumped into the cylinder, the piston and weights are forced up to a position where they are held. When they are released, they force the water out of the cylinder rapidly, providing the machine with hydraulic power. Hydrostatic Devices Water or oil under pressure is monly used as a source of power for many types of presses, riveting machines, capstans, winches, and other machines. The hydraulic press, or hydrostatic press, was invented by Joseph Bramah and is therefore sometimes called the Bramah press. It consists essentially of two cylinders each filled with liquid and each fitted with a piston。 The amount of work produced per pound of falling water is proportional to the head. Water power can be produced in this way from many natural sources, such as waterfalls and dammed rivers.。 Today most hydraulic systems utilize oil rather than water but the principle is the same. You can press a liquid, and a force that is applied at one point is t
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