Self-locking device for KYN61-40.5 type truck shutter drive mechanism

The utility model relates to a self-locking device for a KYN61-40.5 type truck shutter drive mechanism. The self-locking device comprises a shutter drive assembly, wherein the shutter drive assembly comprises a first crank arm, a second crank arm, a third crank arm, a fourth crank arm, a pin shaft and a tension spring, and the free ends of the third crank arm and the fourth crank arm are hinged with an upper shutter and a lower shutter; one end of the first crank arm is hinged onto the inner wall of a cabinet body. The essential points are as follows: a self-locking hole is arranged in the first crank arm, a self-locking assembly formed by a positioning pin, a first interlocking piece, a connecting rod, a second interlocking piece and a self-locking pin shaft is matched with the self-locking hole, and the self-locking pin shaft has two states including an insertion state and a separation state relative to the self-locking hole. According to the self-locking device provided by the utility model, the self-locki