In this paper,a multi-point inductive door crane walking limit limit device is developed,which adopts the principle of proximity induction,and accurately controls the moving distance of the door crane by setting multiple groups of induction components and detection components on one side of the cable reel,which changes the dilemma of high failure rate and narrow working surface of the original mechanical transmission type limit,greatly facilitates personnel maintenance,and improves the accuracy and safety stability in the process of moving the door crane.
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