Self-sealing dry quick connector for loading and unloading at bottom of tank car

The utility model relates to the technical field of joints, in particular to a self-sealing dry type quick joint for loading and unloading at the bottom of a tank lorry, which comprises a female head, a circular ring mounted on the side wall of the female head in a threaded manner, a male head fixedly mounted on the side wall of one side, far away from the circular ring, of the female head, and an unloading joint fixedly mounted on the side wall of the circular ring; a sealing mechanism and a first sealing ring are fixedly installed in the first containing groove, a clamping groove is formed in the first sealing ring, a second sealing ring is fixedly installed in the circular ring, the second sealing ring is matched with the clamping groove, and sealing of the inner groove is completed by placing the second sealing ring into the clamping groove formed in the first sealing ring. Compared with a common sealing mode, inner groove sealing can provide better sealing performance, due to the fact that the second sea