Discharge port locking device of bulk grain transport vehicle

The utility model relates to a discharge port locking device of a bulk grain transport vehicle, which mainly comprises a lock base, a lock bolt, a spring, a hanger and the like, wherein the lock base is fixed on the door of the vehicle and the hanger is fixed on the upright column of the door. The lock bolt is mounted on the lock base in a rotatable manner through a pin shaft, so that the lock bolt suspends the hanger to achieve the locking purpose under the tension of the spring; and by operating the tail part of the lock bolt to rotate the lock bolt, the lock bolt is detached from the hanger, so that the door can be opened. The discharge port locking device is characterized by large tension strength, convenient operation and simple structure.