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我国在1956年就开始拖挂运输,到目前为止交通部门拖挂率已达55%左右,并每年平均以八千至一万辆的挂车增长速度向前发展着。但多年来挂车、半挂车的制造与使用各部门自成系统,以致挂车、半挂车型号繁多,规格不一,直到国家计委计计(1978)696号文规定挂车由交通部归口,才着手制订挂车,半挂车各项标准,逐渐向着标准化、系列化、通用化方向发展。汽车挂车、半挂车的标准化,对简化设计,合理发展产品,促进专业化生产,保证产品质量,方便维修,提高零部件互换性,实现“区段运输”、“甩挂运输”、“滚
Our country began to trawl transport in 1956, so far the traffic department has reached about 55% and the average annual growth rate of trailers has grown from 80,000 to 10,000. However, over the years, the manufacture and use of semitrailers and semitrailers have become a system of their own. As a result, there are many types of trailers and semi-trailers with different specifications until the State Development Planning Commission (1978) No. 696 stipulates that trailers should be started by the Ministry of Communications Development of trailer, semitrailer standards, and gradually toward the standardization, serialization, universal direction. Car trailer, semi-trailer of the standardization of the simplified design, rational development of products and promote specialized production, ensure product quality, ease of maintenance, improve the interchangeability of parts and components, to achieve ”section transport “,”roll