Improved structure of threaded drill rod with tool withdrawal groove

• Main Authors: WANG GUOXUAN, HUANG XIANQIU
• Format: Patent
• Language: Chinese; English
• Published: 19.07.2022
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention discloses an improved structure of a threaded drill rod with a tool withdrawal groove, and belongs to rock drilling tools. The threaded drill rod is simple in structure and not prone to breakage. The front section of the drill rod body is provided with an external thread section; a tool withdrawal groove (1-4) is formed between the external thread section (1-2) and the rod handle (1-6) and is in smooth transition connection with the external thread section (1-2) through an arc surface (1-3); the distance L from the front end face (1-1) of the external thread section to the tail end (1-7) of the external thread section is smaller than the depth H of a threaded blind hole of the drill bit trouser body (2); the difference value A between the depth H of the threaded blind hole and the distance L from the front end face (1-1) of the external thread section to the tail end (1-7) of the external thread section is 2-6 mm. The stress condition of the drill rod near the bending fulcrum can be improved, th