Hole bottom desilting device for hob drill bit

The utility model discloses a hole bottom desilting device for a hob drill bit, which relates to the existing commercially available hob drill bit and comprises a base assembly, a desilting assembly and a pin shaft. The desilting assembly is rotationally connected with the base assembly through a pin shaft, the base assembly is welded to a drill bit bottom plate, and when a drill bit rotates, the base assembly and the desilting assembly rotate along with the drill bit bottom plate. When the hole bottom is uneven, due to the fact that the desilting assembly is connected with the base assembly through the pin shaft, the height of the desilting assembly can be automatically adjusted along with the height of the hole bottom, sediment at the hole bottom can be scraped up and taken away along with flowing mud, and the desilting purpose is achieved. The hole bottom desilting device for the hob drill bit plays a role in cleaning sediments on a working surface at the bottom of a hole, so that the working surface becom