| 摘要 |
A mixing drill bit comprises a hollow body, three sections of blades and a picker. The blades of the lower section are arranged as symmetrical downward ribs. The blades of the upper section are arranged as symmetrical upward ribs. The blade of the middle section is connected to the upper and the lower sections and is arranged as a plate with cutter edges and through long and cross openings connected to the cavity of the body. |
