This utility model relates to the field of
chip marking, specifically disclosing a pneumatic
marking ink tube, comprising: a tube body having a receiving cavity for containing ink; a needle tube disposed at one end of the tube body and communicating with the receiving cavity; a cap assembled on the tube body and sealing the receiving cavity; a sealing plug comprising an axially connected adjusting section and a plug, the plug being used to isolate the fluid communication between the receiving cavity and the needle tube, the adjusting section being detachably connected to the cap and capable of reciprocating along the axial direction of the cap to change the position of the plug; and an ink guide core comprising a connecting member and a
fishing line, one end of the
fishing line being fixed to the connecting member, the ink guide core passing through both ends of the sealing plug and capable of reciprocating relative to the sealing plug, the other end of the
fishing line extending out of the needle tube. The beneficial effects of the above technical solution are: the sealing plug opens or closes the fluid channel between the needle tube and the receiving cavity through axial movement, and the ink tube enters the usage state after the fluid channel is opened. The sealing plug can stably remain in the moved position, ensuring smooth subsequent marking work.