The present application relates to elevator technology, in particular to a safety chain device and a safety protection system for an escalator. The safety chain device according to an aspect of the application comprises: a safety chain including a plurality of protective switches connected in series, each of the protective switches is configured to switch from a first state to a second state in the event of abnormal operation of a respective corresponding drive chain; a resistive network encoder coupled with the safety chain and having a plurality of encoder output values, each of the encoder output values corresponds to one of combinations of states of the plurality of protective switches; a processor coupled with the resistive network encoder and configured to output a level signal corresponding to the encoder output values; a first controlled current source coupled with the safety chain and configured to output a first current corresponding to a current flowing through the safety chain; and a second controlled current source coupled with the processor and configured to output a second current corresponding to the level signal.


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    Title :

    SAFETY CHAIN DEVICE AND SAFETY PROTECTION SYSTEM FOR ESCALATOR


    Additional title:

    SICHERHEITSKETTENVORRICHTUNG UND SICHERHEITSSCHUTZSYSTEM FÜR ROLLTREPPE
    DISPOSITIF DE CHAÎNE DE SÉCURITÉ ET SYSTÈME DE PROTECTION DE SÉCURITÉ POUR ESCALIER ROULANT


    Contributors:
    MA KUN (author)

    Publication date :

    2023-10-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66B Aufzüge , ELEVATORS



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