DIO216
DIO216
在分析各种状态时，要特别注意系统从一种工作状态转换到另一种工作状态，是由哪些原件发出的信号，使哪些控制原件动作，从而改变什么通路状态，达到何种状态的转换。在阅读时还要注意，主油路和控制油路是否有矛盾，是否相互干扰等。在分析各个动作油路的基础上，列出电磁铁和其它转换元件动作顺序表。
液压原理图的快速识别方法比较难掌握的是液压的图形符号，因为液压技术中各种元器件类型繁多，在机电一体化的设备应用领域也非常广泛，再加上技术的飞速发展，尽管图形符号有相关的国际与标准，但是标准也是不断变化的;还有的厂商标新立异也使得标准变化，因此现今的液压系统油路图上，经常出现一些似是而非、莫名其妙、找不到对应标准的符号，这就使得识读液压原理图有时候很困难。
通常的解决办法有二种，一是从总体上分析其功能，在掌握功能的基础上进行识读;二是从样本找出标新立异的规律，例如溢流阀的符号，要像减压阀那样从进口引一条的线回来，实际上表示背压的影响，不是有什么新花样，只要掌握原理，对照样本就能识读。
控制元件包括方向控制元件、流量控制元件、压力控制元件。在学习的过程中要注重对比利用图形符号的异同点进行记忆不失为一种好方法。例如压力控制元件即压力阀按照其功能和用途不同可分为溢流阀、减压阀、顺序阀、压力继电器等。
溢流阀图形符号特征:方框内箭头与表示进出油口的线段错开(意为初始状态下进出油口不通)，虛线从箭头的起始位置引出(意为控制油液从进油口引出)，无虚线引出油箱(意为采用内泄式)，出口一般通油箱。
顺序阀图形符号特征:方框内箭头与表示进出油口的线段错开(意为初始状态下进出油口不通)，虚线从箭头的起始位置引出(意为控制油液从进油口引出)，有虚线引出油箱(意为采用外泄式)，出口连接工作油路。
减压阀图形符号特征:方框内箭头连接表示进出油口的线段(意为初始状态下进出油口连通)，虚线从箭头的终止位置引出(意为控制油液从出油口引出)，有虚线引出油箱(意为采用外泄式)，出口连接工作油路。压力继电器是一种将液体压力信号转换成电信号的电液控制元件，图形符号特征:方框一边为液控符号，相对的一边为复位弹簧，方框内有倒三角布置的三点，下方和靠近液控符号的两点由线段相连。
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