Extension overspeed device tensioner life's device

The utility model discloses an extension overspeed device tensioner life's device relates to metallurgical equipment technical field. This extension overspeed device tensioner life's device, includingthe activity roller seat, the right side fixedly connected with joint piece of activity roller seat, the right side of activity roller seat is provided with movable frame foundation, the joint groovehas been offered in the left side of activity frame foundation, the joint piece is located the inner chamber in joint groove, first recess has all been seted up to the top and the bottom of joint piece, the second recess has all been seted up to the top and the bottom of joint inslot wall, the outside of first recess is linked together with the outside of second recess. This extension overspeed device tensioner life's device is through the structural design of joint piece, joint groove, first recess, second recess, fixed block, first magnet and second magnet to the roller of having solved roller that long -term use le