Equipment to automate control of coal-car traffic and doors in pit-top airlock is claimed to be one of first of its kind to incorporate static switching control giving great reliability by elimination of mechanical wear associated with moving parts; proximity switches with 2 1/2-in. range are used to detect car axles; heads with range of 1/2 in. will prove airlock doors open and closed and detect position of rams and stops; ultrasonic sensing devices are fitted to all airlock doors to prevent them from closing if there is obstruction beneath them.


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    Title :

    Colliery air-lock automation


    Additional title:

    Colliery Guardian


    Published in:

    Colliery Guardian ; 210 , n 5416


    Publication date :

    1965


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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