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为设计电气控制环节控制刀库的正常动作、设计数据采集环节采集刀库工作时的状态 信号和设计PLC控制环节控制故障预警机构的动作。<br /> 3.1控制电路设计<br /> 3.1.1主电路控制电路设计<br /> 盘式刀库换刀系统可靠性试验台的主电路如图3.1所示。为防止电机卡死、保护 电气元件和电机，在主电路上设置了空气开关QS1;接触器KM1主触点用来控制主电路 的通断；空气开关QS2、QS3分别用来手动控制机械手电机和刀库电机的通断，起到保 护机械手电机和刀库电机的作用；接触器KM2主触点用来自动控制机械手减速电机的 运转；接触器KM3主触点用来自动控制刀盘减速电机的正转；接触器KM4主触点用来 自动控制刀盘减速电机的反转；热继电器RJ1、RJ2分别实现对机械手电机和刀盘电机 的过载保护。<br /> 控制柜面板处设有电源启动、电源停止、电源急停和报警机构指示灯四个按钮， 电源启动按键控制接触器KM1线圈得电、辅助触点的自锁、主触点的吸合，电源启动 按键自带绿色指示灯，显示主电路的工作状态。电源停止按钮可以切断主电路，在发 生紧急情况时，可以人为的停止刀库的运转，电源停止按钮自带常亮红色指示灯，在 发生危险时易于辨认。C1继电器触点线圈接入PLC输出端，控制继电器触点的通断， 从而控制预警机构的动作。<br /> 3.1.2辅助电路电气控制电路设计<br /> 盘式刀库换刀系统可靠性试验台辅助电路如图3.2所示。空气开关QS1对控制辅 助电路的起到总体保护作用；接触器KM1主触点用来控制辅助电路总体的通断；QS4 控制所有继电器的通断，同时为24V电源引入220V电压；继电器A1用来控制接触器 KM2线圈的通断，A1的常开触点由PLC直接引出，由PLC控制继电器A1常开触点 的吸合；继电器Bl、B2分别用来控制接触器KM3和KM4线圈的通断，Bl、B2的常<br /> 开触点同样由PLC直接引出，由PLC控制继电器Bl、B2常开触点的吸合;<br /> QS1 KM1</p> <p>图3.1主电路电气控制电路<br /> 3.1.3试验台动作流程分析<br /> 1. 刀库电路控制：首先闭合总开关QS1,电源停止按钮红色指示灯常亮；按下电源 启动按钮，接触器线圈KM1得电，KM1辅助触点得电吸合并形成自锁，KM1主触点 得电吸合，整个电气控制系统接通；按下电源停止按钮或者电源急停按钮，接触器KM1 线圈失电，KM1辅助触点、主触点断开，整个电气控制系统失电，刀库停止动作。<br /> 闭合机械手减速电机空气开关QS2和刀库减速电机空气开关QS3,刀库动作电路 接通；PLC输出信号至继电器A1线圈，A1常开触点吸合，接触器KM2线圈得电， KM2主触点吸合，机械手减速电机得电开始运转；同理，PLC输出信号至继电器B1 线圈，B1常开触点吸合，接触器KM3线圈得电，KM3主触点吸合，刀盘减速电机得 电开始正转；当继电器B2线圈得电时，B2常开触点吸合，接触器KM4得电，KM4 主触点吸合，刀库减速电机反转。刀库旋转方式由PLC程序依据目标刀号就近原则进 行选择。</p> <p>图3.2辅助电路电气控电路<br /> 2. 气缸动作：气缸动作由PLC通过三位五通电磁阀进行控制。倒刀时，PLC向继 电器D1发出命令，D1线圈得电，D1常开触点闭合，三位五通电磁阀倒刀气路接通， 倒刀动作执行；回刀时，PLC向继电器D2发出命令，D2线圈得电，D2常开触点闭合， 三位五通电磁阀回刀气路接通，回刀动作执行。<br /> 3. 预警执行机构控制：继电器C1由PLC控制，正常工况下，继电器C1线圈未得 电，预警执行机构不动作；当传感器实时传至上位机的信号超过预警阈值时，PLC向 继电器C1发出信号，C1线圈得电，C1常开触点闭合，预警执行机构接通电源，发出 警报。</p> <p> </p> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">本文采摘自“加工中心盘式刀库换刀系统的故障预警方法研究”，因为编辑困难导致有些函数、表格、图片、内容无法显示，有需要者可以在网络中查找相关文章！本文由伯特利数控整理发表文章均来自网络仅供学习参考，转载请注明！</span><span lang="EN-US" style="font-size:9.0pt"> <o:p></o:p></span></p></div> <div class="blank30"></div> 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