Novel rolling -mill housing locking device

The utility model provides a novel rolling -mill housing locking device connects through supporting beam between operation side memorial archway and the transmission side memorial archway, and the pull rod passes supporting beam just runs through operation side memorial archway and transmission side memorial archway, operation side memorial archway is equipped with the bolt pneumatic cylinder withthe junction outside of pull rod, the jar pole of bolt pneumatic cylinder links to each other with the cardboard round pin, be equipped with corresponding pinhole on the pull rod of cardboard round pin below, the flexible cardboard round pin that drives of jar pole of bolt pneumatic cylinder stretches out and inserts in the pinhole, the stretching position department that corresponds the cardboard round pin on the operation side memorial archway is equipped with a proximity switch, the inserted position department that corresponds the cardboard round pin is equipped with the 2nd proximity switch, the transmission sid