A drilling fluid self-circulating type drill bit

Abstract

The application discloses a drilling fluid self-circulation type drill bit, which comprises a square sleeve, a top plate, a driving shaft, an upper cover plate and a lower cover plate, the lower end of the square sleeve is provided with the top plate, the square sleeve is connected with a cylinder through the top plate, the driving shaft is arranged in the cylinder and a driving disc is mounted on the surface of the driving shaft, the driving disc is in transmission connection with the cylinder through the driving keys on the inner wall of the cylinder, the upper cover plate is rotationally connected to the surface of the driving shaft and located below the driving disc, the lower cover plate is rotationally connected to the surface of the driving shaft, an eccentric pump shell is welded to the upper surface of the lower cover plate, a water scraping assembly is arranged in the eccentric pump shell and in transmission connection with the driving shaft, the drilling fluid flowing into the eccentric pump shell is pushed by the water scraping assembly and discharged from a water outlet quickly, the faster the drill bit rotates, the faster the drilling fluid flows, the drilling fluid flow achieves the purposes of cooling the drill bit and improving the drilling efficiency, the continuous working capacity of the drill bit is enhanced, the service life of the drill bit is prolonged, and the drilling efficiency of the rotary excavator is improved.

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