Abstract: Self-moving crushing station is a kind of crushing apparatus in open-pit mine.In order to improve production efficiency，parts of relevant travelling device above its travelling mechanism can be rotated as a whole circle，and stopped in the optional position and locked in the present position.Because of the worse working environment，it is difficult to escape from touching the bin of the crushing station in discharge of excavator，which leads to the drive unit of the rotating mechanism in the crushing station damaged.Because rotary mechanism locates in the key structural position，when it is damaged，it is hard to maintain or change the unit.It would directly influence working efficiency and service life of crushing station.Facing with the issues appeared，a kind of solution which adopts the new braking structure is proposed.This braking structure is reliable for the movement of the rotating mechanism，and simultaneously has the protective function to the drive unit parts.Meanwhile，the braking structure needs small space，and the friction piece is easy to be replaced after worn.

Key words: Self-moving crushing station, Rotary, Braking structure, Improvement