剪式小型举升机机械设备外文文献翻译、中英文翻译、外文翻译

中中国国地地质质大大学学长长城城学学院院 本本科科毕毕业业设设计计外外文文资资料料翻翻译译 系系别：别：工程技术系工程技术系 专专业：业： 机械设计制造及其自动化机械设计制造及其自动化 姓姓名：名：王宁宁王宁宁 学学号：号： 05211607 05211607 2015 2015 年年 4 4 月月 1 1 日日 外文翻译原文外文翻译原文 Scissor lifeScissor life In today s society rapid development, some companies in the process of work to help, you need to use lifting machine. Lifters began using the invention of the United States in 1925, development has been through a lot of changes and improvements, types and development to a lot of kinds, generally has the pillar type and scissors, the drive mode with mechanical drive, hydraulic transmission, pneumatic transmission, etc. This design is from the generation and development of lifting machine, and introduces the manufacturing process improvement, etc. The direction of the lifting machine design choiceThe direction of the lifting machine design choice Now we can see most of the lifting machine most fixed installation. Portable lifting machine but we also have several successful design, such as traction type lifting machine, shear fork lift machine, etc. The prominent nature of this type of lifting machine advantage is good flexibility, can open at any time to repair the field service, easy to use, which make full use of its advantages. Because now lifting machine more fixed, so we consider the development and use of portable lifting machine, this scissor lift machine is designed. Until now we have the potential of the lifting machine for the development and utilization of the many ways, but there is still a developing widely and use efficiency is not high enough. Lifting machine, however, is when is now one of the essential equipment of many industries, is also one of the indispensable accessories on many large machinery in the future, thus promote our better to study about the structure of it, to improve, so as to extend the service life of the equipment and improve the perance of equipment. So far, our country s lifting machine manufacturing technology over, there have been some quality technology is more mature, yu shu to lifting device has also been widely used in various fields, for our country s economic and social development has made irreplaceable contributions. The history of lifting machineThe history of lifting machine Lifting machine in the world already had 70 years of history. Production in the United States in 1925 the first car lifting machine, it is a kind of controlled by pneumatic lifting machine, single column due to the use of air pressure is low, and block; Using leather to seal at the same time, thus when compressed air driven bounce and serious instability. Until ten years later, in 1935 the single-column lifting machine is adopted in other parts of the outside of the United States. In 1966, a German company produced the first double column lifting machine, this is another breakthrough in the design of the lifting machine, but it was not until 1977 the lifting machine in other countries outside Germany. Now double colum