机械是由若干相互联系的零部件按一定规律装配起来,能够完成一定功能的装置。机械在给人们带来高效、快捷和方便的同时,在其制造及运行、使用过程中,也会带来撞击、挤压、切割等机械伤害和触电、噪声、高温等非机械危害。企业在日常生产过程中使用着各种机械设备,可以缩短产品生产周期,降低生产成本,有力地促进生产效率和经济效益的增长。但在使用机械设 Machinery is a number of interconnected parts by a certain law assembly, to complete a certain function of the device. Machinery to bring people efficient, fast and convenient at the same time, in its manufacturing and operation, the use of the process, it will also bring impact, extrusion, cutting and other mechanical injury and electric shock, noise, high temperature and other non-mechanical hazards. Enterprises in the daily production process using a variety of mechanical equipment, can shorten the production cycle, reduce production costs and effectively promote the production efficiency and economic growth. But in the use of mechanical design