The utility model provides a D shape bolt locking pitch chamber device, two pitch export symmetries set up in the bottom in pitch chamber, and the pitch export is fixed by the fastener of a set of symmetry, the top of pitch export is equipped with D shape bolt -up mouth, installs D shape bolt in the D shape bolt -up mouth, and the bottom of pitch export is equipped with the fastening pin, the fastening pin is used for carrying out fixed connection with pitch export and pitch chamber, and D shape bolt -up mouth, D shape bolt are used for carrying out locking joint with the pitch export with the pitch chamber. The utility model discloses a seal structure realizes the locking completely in pitch export and pitch chamber through rotating D shape bolt 180 promptly, the full bolt locking of the tradition of comparing, the utility model discloses the structure has swift, the convenient characteristics of locking speed.