卧式钢筋切断机设计

重庆航天职业技术学院毕业设计（论文）

设计题目卧式钢筋切断机设计

专业机电一体化

班级 11061042

学号

姓名

指导教师

起止日期 2014.02.25-2014.04.25

机电信息工程系制

中文摘要

卧式钢筋切断机是建筑上广泛使用的，它主要的工作原理是：应用电动机经一级三角带传动，二级齿轮传动减速后,带动曲轴旋转,曲轴推动连杆使滑块以及动刀片在切断机机座的滑道中作往复直线运动,因此使活动刀片和固定刀片相错而切断钢筋。

与此同时应根据电机的工作环境选择电动机类型，采用卧式安装方式，防护式电机，鼠笼式三相异步电动机。选择三级减速，先是一级带减速，再采用两级齿轮减速。一级带传动具有缓冲、吸振、运行平稳、噪声小、合过载保护等优点，并安装张紧轮。两级齿轮减速的主要优点是齿轮传动可用来传递空间任意两轴间的动力和运动，并且具有功率范围大，传动比准确，传动效率高，使用寿命长，工作安全可靠等一系列特点。动力由电动机输出,通过减速系统传动,把动力输入到执行机构。由于传动系统作的是回转运动,而钢筋切断机的执行机构需要的直线往复运动,为了实现这种转换,可以采用曲柄滑块机构,盘行凸轮移动滚子从动件机构,齿轮齿条机构。本课题采用曲柄滑块机构作为本机械的执行机构。

关键词：建筑切断齿轮钢筋曲柄滑

Abstract

The article introduces a kind of architectural lie type steel cutting machines. Its operating principles are: It use electric motors level triangle belt transmission and secondary gear transmission to slowdown. Then, it drives the crank rotate, The crank connected to slide block and moving blades in the slippery way make the back and forth straight line sport, makes the moving blades and the fixed blade shear and cut steel.

According to the working environment choice the type of electric motors, using horizontal installation, protection of the electrical, squirrel-cage three-phase asynchronous motor. Option three slowdown,

first level belt slowdown, followed by the secondary gear deceleration. First level with the introduction of automated, because it has a buffer, absorb shock and operate smoothly, small noise, and can protect the over loading. Then introduce a secondary gear deceleration slowdown, because gear transmission can be used to transmit arbitrary space between the two axis movement and momentum, and the scope of power, transmission efficient transmission accurately, long using life, such as safe and reliable character. Power output by electric motors through slow down transmission system to import power to the executive body. As the system make rotation movement, The steel cutting machine needs the back and forth straight line sport ,in order to achieve this transformation, we can use c slider-crank institutions or gear and rack. I decided to consider realistic conditions using slider-crank as the executing machinery.

Key words ：cutting architectural reinforcing steel dar gear slider-crank

目录

中文摘要......................................... - 1 - Abstract ......................................... - 2 - 引言........................................... - 4 - （一）概述.................................... - 4 - （二）题目选择................................ - 4 - （三）钢筋切断机的工作原理.................... - 4 - 二、电机的选择................................... - 7 -

（一）切断钢筋需要力计算...................... - 7 - （二）功率的计算.............................. - 7 - 三、传动结构的设计............................... - 9 -

（一）基本传动数据的计算...................... - 9 -

1.分配传动比............................... - 9 -

2.计算机构各轴的运动及动力参数............. - 9 -

(二)带传动的设计............................. - 10 -

1.带型的确定.............................. - 10 -

2.带轮基准直径............................ - 10 -

3.带速的确定.............................. - 10 -

4.中心距、带长及包角的确定................ - 10 -

5.确定带的根数............................ - 10 -

6.张紧力的计算............................ - 11 -

7.作用在轴上的载荷........................ - 11 -

8.带轮结构与尺寸.......................... - 11 -

（三）齿轮传动的设计......................... - 12 -

1.第一级齿轮传动的设计.................... - 12 -

2.第二级齿轮传动的设计.................... - 15 -

（四）轴的校核............................... - 18 -

1.一轴的校核.............................. - 18 -

2.三轴的校核.............................. - 21 -

（五）键的校核............................... - 24 -

1.平键的强度校核.......................... - 24 -

（六）轴承的校核............................. - 26 -

1.初选轴承的型号.......................... - 26 -

2.切断机的寿命计算........................ - 26 -

四、总结........................................ - 29 - 致谢............................................ - 30 - 参考文献........................................ - 31 -