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外文翻译-液压起重机卷扬制动的控制.doc

发布:2018-10-09约5.9千字共6页下载文档
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PAGE 1 First, hydraulic hoist rolls of control hydraulic pressure case applied the brake to raise rise equilibrium of return circuit can only to surmount load play limit act on rapidly, glide and cant support to the heavy object produced because the hydraulic motor is revealed. So in order to must guarantee the absolutely reliable supporting heavy object by the brake or rely on having to lock the reel from the decelerator of lock ability. If a hydraulic motor drives the requirement that the difference drive occasionally of two reels, or must set up the clutch between reel and hydraulic motor under possessing the gravity to drop the situation of the function as needing the reel. When the clutch is uncoupled, supporting the heavy object will totally depend on the brake soon. Roll raise organization clutch and function of brake mechanism by entrust to, rub piece or rub, lead with sure impaction strength. So the requirements for the clutch and brake hydraulic jar compress tightly strength instead of sports. Talk about sport, limited to, rub component uncouple or overcome interval at the joint only, movement of small distance of some needed. So, clutch hydraulic jar and brake hydraulic jar only just have very small flow that is required while opening and closing, and the demanding to have lasting pressures of main requirement. Demand to protect and press. So need the constant pressure source to guarantee. In this way, there are two kinds of different requirements to the hydraulic source to the hydraulic system of promoting the organization arises. In order to drive the reel, its hydraulic motor of motor require that flows in the source permanently, but raise the brake or clutch to need the constant pressure source in order to control one. And the permanent source of the running part is the large flow of high pressure, but it is the small flow to control some constant pressure sources. Present two and require in the same system differently how to deal with? Second, re
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