| 摘要 |
A tree trunk injection needle. Provided the axis of the needle are a tapered front portion (1), a cylindrical middle portion (2), and a cylindrical rear portion (4), the outer diameter of the rear portion being greater than the front portion and the middle portion. The front portion is provided with a fragment guidance hole (11) that extends along the axis of the needle, and the rear portion is provided with a pesticide delivery hole (41) that extends along the axis of the needle. The middle portion is provided with two pesticide/fragment discharge holes (21, 22) that extend along the radial direction, and said two holes (21, 22) are separated by a flow partition (23). The rear end of the fragment guidance hole (11) is in communication with both of said two discharge holes (21, 22) on the two sides of the flow partition (23). The front end of the pesticide delivery hole (41) is in communication with both of said two discharge holes (21, 22). The needle experiences little resistance, is not easily bent or broken, and does not cause the tree trunk to bulge or crack. |
