文档介绍：毕业设计中英文
翻译
起重机发展史、分类及前景
学生姓名: 学号:
学院: 机械工程与自动化学院
专业: 机械设计制造及其自动化
指导教师:
2011年5月
Crane history, classification and prospects
   概念 Concept   起重机(Crane) 属于起重机械的一种, Crane (Crane) is a kind of lifting, 是一种作循环、 Is a for loop 间歇运动的机械。 Intermittent motion machinery. 一个工作循环包括: A work cycle, including: 取物装置从取物地把物品提起, Extract plant extract to the items from the institute, 然后水平移动到指定地点降下物品, Then move to the designated location lowered the level of items 接着进行反向运动, Then, the reverse movement, 使取物装置返回原位,以便进行下一次循环。 Back to extract device in situ for the next cycle.  
    通常起重机械由起升机构( 使物品上下运动) 、 Usually by the crane hoisting mechanism (the items up and down movement),   运行机构( 使起重机械移动) 、 Operating agencies (the lifting movement),   变幅机构和回转机构( 使物品作水平移动) , Luffing and slewing mechanism (the articles for the horizontal movement),   再加上金属机构, Coupled with the metal body   动力装置, Power plant,   操纵控制及必要的辅助装置组合而成。 Control and manipulation of bination of the necessary auxiliary equipment.    类型 Type       在建桥工程中所用的起重机械, In the bridge used in the construction crane, 根据其构造和性能的不同, According to its structure and properties of different 一般可分为轻小型起重设备、 Can be divided into light and small lifting equipment, 桥式类型起重机械和臂架类型起重机三大类。 Bridge type crane and jib type crane three categories. 轻小型起重设备如: Small-sized lifting equipment such as: 千斤顶、 Jack, 葫芦、 Gourd, 卷扬机等。 Winch and so on. 桥架类型起重机械如梁式起重机、 Such as the type of crane girder bridge cranes, 龙门起重机等。 Gantry cranes.
    臂架类型起重机如固定式回转起重机、 Type of crane boom, such as fixed slewing cranes,   塔式起重机、 Tower crane,   汽车起重机、 Crane,   轮胎、 Tires,   履带起重机等。 Crawler cranes.  
    在一定范围内垂直提升和水平搬运重物的多动作起重机械。 Within a certain range to enhance the vertical and horizontal multi-action heavy lifting crane.   又称吊车。 Also known as the crane.   属于物料搬运机械。 Are material handling machinery.   起重机的工作特点是做间歇性运动, Crane's work is characterized by intermittent exercise to do,   即在一个工作循环中取料、 That is expected to take a work cycle,   运移、 Migration,   卸载等动作的相应机构是交替工作的。 Unloadin