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陕西欣鸿然自动化设备有限公司
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行程开关就是一般所说的限位开关。可以理解为是一组接通或断开的简单电路。
“用来检测物体是否移动到限定的位置”，例如，机床的移动工作台上装撞块，相对不动的床身上装行程开关，当机床工作台移动预先设定的距离后，工作台上的撞块压动床身上安装的行程开关，行程开关断开或接通，就有电信号反应到控制柜中，工作台停止移动或反向移动。
“原理是当物体碰触到限位开关，开关的常开点闭合，常闭点断开，用来控制电路或接受信号”
常开与常闭是开关的两种原始状态，常开型一般指没有压下的状态电路是开通的，常闭型一般指没有压下的状态电路是断开的。根据需要来进行选择，开关的常开点断开或常闭点闭合。
如撞块压下行程开关常开点断开（断开电路）或常闭点闭合（接通电路）
常开接点：在不受外力（包括电力）的作用下，开关断开的，就是常开接点。
物体碰触到限位开关，开关的常开点闭合，常闭点断开，用来控制电路或接受信号。物体可以是任何机械装置。行程开关与继电器是不同的“开关”继电器是有电磁线圈的，行程开关是没有的，内部只有开关接点，需要外力的作用才使开关转换状态。
限位开关的应用方面很多，很多电器里面都有它的身影。那这么简单的开关能起什么作用呢？它主要是起连锁保护的作用。最常见的例子莫过于其在洗衣机和录音机（录像机）中的应用了。
Limit switch is mainly used for the mechanical displacement into an electrical signal, the motor running state can be changed, so as to control mechanical action or to be used in process control.
Position switch real handy limit is in industry, where it and other equipment, composed of more complex automation equipment.
Machine tools have many such limit switch, it is used to control the movement of the workpiece or automatic feed stroke, to avoid collision. Sometimes use the limit switch makes the controlled objects between the provisions of the two position automatic reversing, so as to obtain the continuous reciprocating motion. Such as auto transport material car reaches the finishing touch limit switch, to connect to the dumper body, put an overturned car material, and return to the starting point. Arrive at the starting point after the starting point of the touch switch, the circuit charging mechanism, start automatic loading. Always go on like this, it becomes a set of automatic production line, need not tube, working day and night, save the manual labor.
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