Manipulator is a mechanical technology and electronic technology with the combination of high technology products. Using manipulator is to improve product quality and productivity, and realize the automatic production process, improve working conditions, and reduce labor intensity of a kind of effective method. It is an imitation of the upper part of the human body function, according to the predetermined requirement or parts transportation holding tools for operation of the automation technology and equipment. Robots can replace the hands of heavy labor, significantly reduce the labor intensity, improve working conditions, and improve labor productivity and production automation level. Industrial production often appears in the handling of the heavy and long-term, frequent, drab operation, USES the manipulator is effective; In addition, it can be in high temperature, low temperature, deep water, the universe, radioactive and other toxic, pollution environment conditions operation, more shows its superiority, with broad prospects.

This topic is the main content of the mechanical design principle of the design of the three dof carrying manipulator, familiar with three degrees of freedom of the manipulator using occasions and related design steps. Robots can replace a lot of repeatability of physical labor, so as to reduce the labor intensity, improve production efficiency. Combined with three degrees of freedom all aspects of design knowledge, in the design process learn how to find out the problem to solve problems. And in the design idea and into their idea, improve their innovation ability. Try to make robots easy to use simple structure.

随着人类科技的进步，社会经济的发展，机器人学成为近几十年来迅速发展的一门综合学科。它体现了光机电一体化技术的最新成就，机械手作为其中的佼佼者更是发挥了不可磨灭的作用。在人类社会中，凡是有机械活动的地方，都能看到机械手的身影。机械手产品的应用已经由核工业和军事科技等高端科学领域向医疗、农业甚至是服务娱乐等民用领域发展了，并且各式各样的机械手正在涌现出来，以惊人的速度延伸到人类活动的各个领域。机械手是由于人类期望生产水平的提高，为了提升生产效率而出现的。然而由于机械手善于完成重复的，单调的，精确度要求高的工作，能取代人在恶劣的环境中完成人类不能或者不愿完成的工作，因此，机械手的出现又大大解放了人类的生产力。所以说机械手的发展是社会发展的结果，也是社会发展的必然趋势。现在，很多发达国家都追逐着机械手这一发展趋势，积极地进行着机械手的各种开发和研制的工作，并且其中一些国家已经取代了不错的成果，研制出了许多新型且实用的机械手或者是机器人。例如：日本的跳舞机器人、犬型机器人爱宝(AIBO)；。英国研制的履带式“手推车”及“超级手推车”排爆机器人；美国iRobot公司推出了能避开障碍，自动设计行进路线吸尘器机器人Roomba；上海世博会使用过的福娃机器人等等。

由于机械手的迅猛发展，机械手进入学校教学是必然的。三自由度机械手作为是机械手的典型产品，其设计及应用对机电一体化、机械结构工艺、机械制造、自动化、电子信息等专业的教学及研究都有着很重要的意义。