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1、摘 要 电磁式交互电子白板的板体沿X、Y轴铺设了感应线圈。信号笔前端有电感线圈，使用时CPU向板体的感应线圈先发射一段时间与笔中电感线圈谐振频率相同的电磁波，使笔中的电感电容谐振起来，然后停止发送，板体的感应线圈切换到接收状态，这时，笔里的电感电容失去外在的推动力，笔中的谐振波将会产生衰减震荡，同时用板体的感应线圈接收笔所发射的衰减电磁波，由于电磁耦合，就会在板体的感应线圈上产生感应电动势。这样就在白板上显示笔所走过的路线，将白板的感应线圈分组分区域，将所得的笔的轨迹图传给检测电路进行检测，设计就是根据这个原理来进行检测白板系统是否运作正常及坏点位置的检测。 采用三维雕刻机的结构为原型进行改装
2、，去掉主轴电机及刀具设备，由三个步进电机控制滚珠丝杠进给，滚珠丝杠与滑块相连接，Z方向移动部件固定在X轴的滑块上，而X轴方向的导轨又固定在Y轴的滑块上，实现三个坐标轴的同步运行。关键词：电磁式交互电子白板；感应线圈；信号笔；雕刻机。Abstract Electromagnetic type interactive electronic whiteboard along the X, Y axis laid induction coil. A signal pen in front of inductance coil, when using CPU to the plate body indu
3、ction coil launch for a period of time and in the same pen inductance coil resonant frequency of electromagnetic wave, so that the pen in the inductor capacitor resonant, then stop sending, the board body induction coil switch to the receiving state, then, the inductance capacitance lost pen the ext
4、ernal driving force, in the pen Xie Zhenbo will produce the damping vibration, at the same time with the plate body induction coil receives the sum of the emitted the attenuation of electromagnetic wave, due to electromagnetic coupling, will in the plate body on the induction coil generates induced
5、electromotive force. This is displayed on the whiteboard pen whiteboard traveled route, the induction coil group area, the pen trajectory plan to pass to the detection circuit to be tested, is designed according to this principle to detect the whiteboard system is functioning properly and dead posit
6、ion detection. Using three dimensional engraving machine structure for prototypes were modified, removed from the spindle motor and cutter device, composed of three stepper motor control of ball feed screw, a ball screw is connected with a slide block, Z direction component is fixed in the X axis an
7、d X axis direction of the slide block, the guide rail is fixed on the Y axis on the slider, implementation three axes simultaneous operation.Keywords: Electromagnetic interactive electronic whiteboard; Induction coil; Signal pen; Engraving machine.目 录摘 要Abstract第1章 绪论1 1.1 电磁式电子白板的概述1 1.2 产品的背景1 1.3
8、 研制产品的功能及使用范围3 第2章 系统分析与方案的订制4 2.1 设计参数4 2.2 总体方案选择4 2.2.1 总体布局要求4 2.2.2 运动分配的影响5 2.2.3 工件的尺寸重量和形状的影响5 2.3 总体方案确定5第3章 机械部分9 3.1 滚珠丝杠的计算与选择9 3.1.1 轴向载荷9 3.1.2 当量转速11 3.1.3 当量载荷12 3.1.4 预定额定动载荷13 3.1.5 螺纹最大轴向变量及螺纹最小底径的确定13 3.1.6 初选滚珠丝杠副规格代号14 3.1.7 确定滚珠丝杠副的轴承规格代号14 3.1.8 滚珠丝杠的长度确定15 3.2 滚珠丝杠的校核17 3.2.
9、1 抗压刚度17 3.2.2 丝杠支撑副的刚度18 3.2.3 滚珠丝杠滚珠与滚道的接触刚度18 3.2.4 刚度验算及精度的选择19 3.2.5 验算传动系统的刚度19 3.2.6 验算临界压缩载20 3.2.7 验算临界转速20 3.2.8 轴向额定载荷的验算21 3.2.9 确定滚珠丝杠副规格代号21 3.3 步进电机的计算与选择21 3.3.1 作用在丝杠上的转矩21 3.3.2 预加载荷产生的预紧力矩21 3.3.3 转动惯量22 3.3.4 回转件转动惯量22 3.3.5 直线运动件的转动惯量22 3.3.6 启动力矩23 3.3.7 电机的选择23 3.3.8 联轴器的选择24
10、3.4 直线导轨的选择25 3.4.1 载荷的验算26 3.4.2 寿命的验算26第4章 数控系统设计28 4.1 确定机床控制系统方案28 4.2 主要芯片配置29 4.2.1 单片机芯片选择29 4.2.2 主要特性30 4.2.3 芯片擦除32 4.2.4 RAM的选用33 4.2.5 EPROM的选用34 4.2.6 89C51存储器及I/O的扩展34 4.2.7 芯片地址分配35 4.3 键盘设计36 4.3.1 键盘定义及功能36 4.4 显示器设计37 4.4.1 显示器显示方式的选用37 4.4.2 显示器接口37 4.5 越界报警电路37 4.6 步进电机接口电路及驱动38结
11、论40致谢41参考文献42CONTENTSAbstractChapter1 Introduction1 1.1 Elect romagnetic white board overview1 1.2 Product background1 1.3 Product development function and range of3Chapter2 System analysis and scheme of order4 2.1 Design parameters4 2.2 General options4 2.2.1 Overall layout4 2.2.2 Motion effect of
12、distribution5 2.2.3 Workpiece size influence of weight and shape5 2.3 The overall scheme5Chapter3 Mechanics part9 3.1 Ball screw calculation and choice9 3.1.1 Axial load 9 3.1.2 Equivalent speed11 3.1.3 Equivalent load12 3.1.4 Predetermined dynamic load rating13 3.1.5 Threads and thread minimum maxi
13、mum axial variable diameter at the end of Cocking13 3.1.6 Primaries of ball screw pair designation14 3.1.7 Determination of ball screw bearing designation14 3.1.8 Ball screw length to determine the15 3.2 Ball Ehat17 3.2.1 Compressive Gondo17 3.2.2 Screw support pair Gond18 3.2.3 Ball screw ball and
14、raceway contact Gondo18 3.2.4 Rigidity and accuracy of the Xuanze19 3.2.5 Checking transmission system Gondo19 3.2.6 Checking compression Jaiho20 3.2.7 Check critical Chanzov20 3.2.8 Axial load rating of the Tansan21 3.2.9 Determination of ball screw pair designation21 3.3 Stepper motor selection and calculation of
