The invention discloses a safety protection device and a safety protection circuit for scaffold-free construction and belongs to the technical field of scaffold-free elevator installation. The safety protection device for scaffold-free construction comprises a manipulator, an upward overtravel device, a downward overtravel device, an alarm device and a signal detecting device, wherein the manipulator is electrically connected with the upward overtravel device, the downward overtravel device, the alarm device and the signal detecting device, and the alarm device is electrically connected with the signal detecting device and is used for alarming when the safety protection device is started, when a car approaches a counterweight housing and the car and the counterweight housing converge. The safety protection circuit for scaffold-free construction comprises a power source, an operating circuit, an upward overtravel circuit, a downward overtravel circuit and an alarm circuit. The safety protection device and the safety protection circuit for scaffold-free construction have the advantages that high safety and convenience in operation are achieved, and the problems that the car overtravels upwards to rush out of guide rails or collapses to the bottom of a pit, and collision and shearing occur when the car and the counterweight housing converge are solved effectively.


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    Title :

    Safety protection device, safety protection circuit and safety protection method for scaffold-free construction


    Contributors:
    YAO LIYONG (author) / XU JIANKUN (author) / MENG GUOHUA (author) / ZHAI KEJIE (author)

    Publication date :

    2015-09-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66B Aufzüge , ELEVATORS



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