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(一) 自五十年代以来,工程机械发展的一个特点是大型化、轮胎化。例如:在装载机、起重机中,轮胎式的已占绝对优势;在平地机中,轮胎式已全部代替了履带式;装载机最大功率已达1270马力,铲运机最大功率已达1650马力,平地机最大功率已达636马力,轮胎式起重机起重量达500吨,汽车式起重机起重量达1000吨,推土机最大功率达1500马力。轴压:五十年代为25吨,到六十年代初就提高到50吨。与之相适应的轮胎规格也越来越大。1950年以前有代表性的为18.00—25(轮胎断面宽度-轮胎直径,单位是英寸,下同),充气外径约1.6米。到1970年则增大到40.00—57,充气
(1) Since the 1950s, one of the characteristics of the development of construction machinery was the enlargement and tireization. For example, in the loaders and cranes, the tire type has become an absolute advantage; in the grader, the tire type has completely replaced the track type; the maximum power of the loader has reached 1270 horsepower, and the maximum power of the scraper has reached 1650 hp. The maximum power of the grader has reached 636 horsepower, the weight of the wheeled crane has reached 500 tons, the weight of the automobile crane has reached 1000 tons, and the maximum power of the bulldozer has reached 1500 horsepower. Axial pressure: 25 tons in the 1950s and rising to 50 tons by the early 1960s. The tire specifications that are compatible with it are also increasing. Before 1950, it was representative 18.00-25 (tire section width - tire diameter, in inches, the same below), inflatable outer diameter of about 1.6 meters. Increased to 40.00-57 by 1970, inflation