描述
延时控制通常应用在开关量控制的场合,当一个开关状态变化时(比如由开变关时),控制器的输出动作要延时一段时间才会给出。比如,在生产线常用的接近开关,当工件就位时,接近开关给出信号,下一个滚筒由于和接近开关安装的位置有一段距离,所以通常要延迟几秒才开始滚动。连锁控制也是常用于开关控制的场合,比如有三个开关,A、B和C,C开关必须在A和B同时打开的时候,才能够打开;或者当A打开时,C必须打开;这种关系就是连锁控制。在工业现场中,尤其是在涉及安全控制的场合,连锁控制方式是很常见的。比如反应釜中的放散阀,当压力达到一定值时,压力开关的信号发生变化,则放散阀门必须立刻打开。电动控制指控制系统的输出是通过电气量或电子信号来进行的,所控制的对象是电动执行元件,比如继电器、步进开关、电磁阀、伺服驱动器和变频器等等,绝大部分的自动控制多多少少都会有电动控制元件。液压控制在机器与设备的操作中,许多控制是用液压控制机构来进行的。在连续速度控制的场合,液压控制通常比较方便和便宜,当能量转换效率较高的时候,液压控制往往和电动控制中的伺服控制同时使用。这时,就形成了效率和精度较高的电液执行机构。气动控制有三种情形用到气动执行机构:运动的线路上有标准的单向气动阀门组合来完成控制逻辑功能;在气体管道中采用一些没有移动部件的元件,这些元件是依靠流过的气体的特性而进行开关动作的;运动的逻辑控制系统,采用模块化的内置隔膜、绕线或套筒式。这三种气动元件都是采用压缩空气作为传输信号或执行机制的动力。在工厂中,由于压缩空气容易获得,干净、无污染,又安全,控制的功能和设计都十分简单,因此,现在许多生产线上采用气动工具。
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DIVERSIFIELD ELECTRONICS PRT-100 TESTER PRT100
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