A multi-stage anti-loosening screw

Abstract

The utility model discloses a multistage anti -loosening screw, including connecting rod, screw body and first rotary head, the bottom fixed connection of connecting rod has screw body, the top fixed mounting of connecting rod has first rotary head, the top of first rotary head is established with rotary groove, the inside of screw body is provided with secondary anti -loosening secondary anti -loosening mechanism of reinforcing, the inside rotationally connected of rotary groove has the drive mechanism that drives secondary anti -loosening mechanism to stretch out. The utility model sets up and is fixedly connected with first rotary head and screw body respectively in the top and bottom of connecting rod, and the set screw body can be screwed to the inside of internal thread hole of outside, after the installation of screw body is completed, drive mechanism moves downward along the inside of rotary groove, so can drive secondary anti -loosening mechanism to stretch out, so can utilize secondary anti -loosening mechanism extrude internal thread groove to reach secondary anti -loosening, prevent because vibration and cause screw body to separate internal thread hole.

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