描述
2磨削机PLC控制系统的硬件设计
2.1磨削机设备组成及设计目标
磨削机主要由1台永宏FBs-44MN系列PLC,1套三菱MR-J2S系列交流伺服系统,3台三菱FR-E540系列变频器,1台WEINVIEW的510T,1个4DA模块组成。其核心是可编程控制器,它的输出部分主要用于控制伺服和驱动电机。其输人部分主要接收各类保护继电器的动作信号。整个设计具体可分为以下4部分:①采用PLC:FBs-44MN完成检测(计算出最佳的进刀量),自动磨削等工序。②利用伺服实现对磨削进刀量的双闭环控制。③利用内部计数器和光电开关读取横向拖板移动距离。④采用触摸屏实现了更为方便、友好的人机通讯。
2.2PLC控制系统构成
控制系统由可编程逻辑控制器FBs-44MN、伺服、光电接近开关和D/A扩展模块以及触摸屏元件组成,实现磨削过程中基本逻辑动作、检测、伺服闭环控制和人机通讯四大功能
1)伺服和定位控制器的结合模块:磨削机要求丝杠上的刀盘在加工前后必须停拖板电机在相同的位置,以便下一加工循环,否则将造成刀具或工件损坏。准确定位在普通继电器控制的鼠笼式交流电机上实现起来比较麻烦,我们采取伺服系统来实现定位,引人速度负反馈消除了外界参数变化和扰动对系统状态的影响,使该系统具有动态响应快、定位精度高、系统稳定性好等特点。为了在工作过程中使精度控制在规定的误差以内,进刀距离通过检测采用闭环跟踪控制。首先是用FBs-44MN读取检测时探头接触版辊的读数,并根据公式显示版辊的直径最大,最小,平均值(与制定合适的切削量有关),然后用此时的伺服读数减去探头读数,再加上需要的切削量求出比较精确的进刀量,最后开始整个自动磨削过程。FBs-44MN作为智能化的定位控制器按用户编制的定位程序向驱动器发出定位脉冲、运行方向等,信号驱动器按这些控制信号驱动伺服电机带动滚珠丝杠进行定位,对于伺服电机,有伺服准备、伺服结束和零位三个信号反馈,外部设定用数字开关可将定位点位置和速度等数值送人定位单元,定位单元通过总线连接到FX系列PLC扩展口上,成为PLC控制系统中的定位智能控制环节,在定位单元内,常量的设置与监控、参数的改变可以通过使用连接到PLC上的数据存取单元完成,因此可以在运行过程中由PLC指定模块号(这里4DA是1号模块),传送定位速度等数据,并能在PLC中监视GM的实时定位信号及运行或停止状态。相应地在PLC中分配有输人继电器,输出继电器,辅助继电器,以及特殊辅助继电器等设备。
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。
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