| 摘要 |
Disclosed is a dental drill head, consisting of a head housing (1), and a wind wheel and bearings (2), wherein the head housing (1) is composed of a head housing cover (5) and a head housing cavity (12), and the wind wheel is composed of a wind wheel shaft (3) and a wind wheel blade (4). An anti-back suction device is formed between the head housing cover (5) and the ends of the corresponding wind wheel shaft (3). The anti-back suction device can be achieved either by setting the head housing cover (5) as a rubber head housing cover (51), or by arranging a rubber piece between the head housing (1) and the wind wheel. The rubber head housing cover (51) and the rubber piece can brake the wind wheel timely just when back-suction occurs so as to reduce the suction of dirt. The dental drill head further comprises a ring-shaped LED lamp, the contact and separation between the top surface of the lamp and an electrically conductive film (63) achieve the switching on and off of the LED lamp, enabling a simplified structure and ease of installation. |
