Dumper rear compartment opening mechanism and dumper

The utility model relates to the field of dump trucks, in particular to a dump truck rear carriage opening mechanism which comprises a rear carriage main body, and a rear carriage door is arranged at the tail of the rear carriage main body. When the rear compartment door locking device needs to be locked, the driving motor clockwise drives the gear to rotate so that the gear can drive the locking frame to rotate, the locking end of the locking frame tilts and is attached to the interior of the connecting groove of the connecting frame, the rear compartment door is fixed, manual locking is not needed, potential safety hazards are reduced, and when the rear compartment door locking device needs to be opened, the rear compartment door locking device is convenient to use. A driving motor anticlockwise drives a gear to rotate so that the gear can drive the locking end of a locking frame to move downwards to be separated, then a rear compartment body is tilted in a hydraulic mode, and therefore under the action of