| 摘要 |
Disclosed is a deslagging type palm for a tricone bit, comprising a threaded cone back (1), a palm back (2) and a shaft head (3). The threaded cone back, the palm back and the shaft head are successively connected, wherein the palm as a whole has a streamline shape, the palm back and two sides of the palm are all provided with a deslagging groove (5, 4), and the two sides and the palm back of the palm respectively have at least one chip discharging groove. The edge of the chip discharging groove has a streamline shape and the groove is a curved groove or an arc-shaped groove. The lower edge of the chip discharging groove of the palm back of the palm is divided into three segments, wherein one segment forms an angle between 20-50° with a horizontal surface of the palm, the middle segment is arc-shaped, the final segment and the horizontal surface of the palm are in parallel. Streamline-shaped deslagging passages are respectively designed on the palm back and the two sides of the palm back due to the optimized streamline design of the palm. The cone bit composed of the deslagging type palm ensures rock debris is smoothly discharged from a well bottom by means of the deslagging passages, so as to reduce the abrasion caused by the rock debris, thereby prolonging the service life of the palm. The abrasion of the palm back meets the design requirements and has a good deslagging effect. |
