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光电开关在起重机上的应用

光电开关在起重机上的应用

光电接近开关是利用光电效应做成的开关,将发光器与光电器件按一定方向装在一个检测探头内,当有反光面(被检测物体)接近时,光电件接收到反应后便在信号输出,由此便可“感知”有物体接近,既断电停车,光电开关具有检测距离长的特点,现起重机上非接触式限位开关多使用反射器型光电开关。

工作原理

将发光管和接收器(一体式)固定在端粱部(或小车驾端部),反射板固定在打车轨道端部(或小车轨道端部)对应位置,当大车向轨道端部移动,移动到检测距离时,接近器收到经放射的光线,经传感器,控制电路分析处理,输出信号给相应控制回路,停止该方向运行。

1、非接触检测,不影响被测物的运行工况;

2、不产生机械磨损和疲劳损伤,工作寿命长;

3、响应快,一半响应时间可达几毫秒活几十毫秒;

4、采用全密封结构,防潮、防尘性能较好,工作稳定性强;

5、物触电、无火花、无噪音,适用于要求防爆的场合;

6、输出信号大,易于与计算机或可编程控制器等接口;

7、体积小,安装、调整方便。

光电式接近开关作为起重机械的行程限位,避免了接触式限位开关的劣势,给安全生产带来了可靠性、安全性及维修的方便性等,同时给起重机电气系统PLC控制的配套运用打下良好基础,为起重机电气自动化发展做好准备。

Application of photoelectric switch in crane

Photoelectric proximity switch is made use of the photoelectric effect of the switch, the light emitting device and photoelectric device according to a certain direction in a detection probe, when there is a reflective surface (object detection) approach, the photoelectric receiving element to the reaction and in the output signal, which can be "perceived" a body close, cut-off, photoelectric switch with characteristics of long detection distance, now crane non-contact limit switch using reflector type photoelectric switch.

working principle

The light-emitting tube and receiver (integral) is fixed on the end of a beam (or car driving end), reflecting plate is fixed in the taxi track ends (or rail car end) corresponding to the position, when the cart to the track end mobile and move to the detection distance, close to the device receive the light emitted, through the sensor, the control circuit analysis, signal output to the corresponding control loop, stop the running direction.

1, non contact detection, does not affect the running condition of the measured object;

2, do not produce mechanical wear and fatigue damage, long working life;

3, the response is fast, half of the response time of up to a few milliseconds to live tens of milliseconds;

4, the use of fully sealed structure, moisture, dust performance is good, strong work stability;

5, electric shock, no spark, no noise, applicable to the requirements of explosion-proof occasions;

6, the output signal is large, easy to interface with the computer or programmable controller;

7, small size, easy to install and adjust.

Photoelectric close to switch as the lifting of the trip limit, avoid contact limit position switch of the weaknesses, to safety, reliability, safety and maintenance convenience, also to crane electrical system PLC control supporting use to lay a good foundation, ready for heavy machine electrical automation development.

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