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行程开关分类

2013-12-30 8:17:39      点击:
行程开关 按结构分
 概述行程开关符号行程开关按其结构可分为直动式、滚轮式、微动式和组合式。直动式行程开关动作原理同按钮类似,所不同的是:一个是手动,另一个则由运动部件的撞块碰撞。当外界运动部件上的撞块碰压按钮使其触头动作,当运动部件离开后,在弹簧作用下,其触头自动复位。
其结构原理如图F1所示,其动作原理与按钮开关相同,但其触点的分合速度取决于生产机械的运行速度,不宜用于速度低于0.4m/min的场所。
直动式行程开关组成
1:推杆 2&4:弹簧 3:动断触点 5:动合触点
滚轮式行程开关
当运动机械的挡铁(撞块)压到行程开关的滚轮上时,传动杠连同转轴一同转动,使凸轮推动撞块,当撞块碰压到一定位置时,推动微动开关快速动作。当滚轮上的挡铁移开后,复位弹簧就使行程开关复位。这种是单轮自动恢复式行程开关。而双轮旋转式行程开关不能自动复原,它是依靠运动机械反向移动时,挡铁碰撞另一滚轮将其复原。
其结构原理如图F2所示,当被控机械上的撞块撞击带有滚轮的撞杆时,撞杆转向右边,带动凸轮转动,顶下推杆,使微动开关中的触点迅速动作。当运动机械返回时,在复位弹簧的作用下,各部分动作部件复位。
滚轮式行程开关组成
1:滚轮 2:上转臂 3&5&11:弹簧 4:套架
6:滑轮 7:压板 8&9:触点 10:横板
滚轮式行程开关又分为单滚轮自动复位和双滚轮(羊角式)非自动复位式,双滚轮行移开关具有两个稳态位置,有“记忆”作用,在某些情况下可以简化线路。
微动开关式行程开关
微动开关式行程开关的组成,以常用的有LXW-11系列产品为例,其结构原理如图F3所示:
1:推杆 2:弹簧 3:动合触点 4:动断触点 5:压缩弹簧

按用途分

一般用途行程开关:如JW2、JW2A、LX19、LX31、LXW5、3SE3等系列。主要用于机床及其他生产机械、自动生产线的限位和程序控制。
起重设备用行程开关,如LX22、LX33系列。主要用于限制起重设备及各种冶金辅助机械的行程。