A bottom expansion drill bit

Abstract

The invention discloses a bottom reaming bit. The bottom reaming bit comprises a drill sleeve, a drill rod and a transmission shaft, wherein the drill rod comprises two drill bars which are hinged together; each drill bar comprises an inserting part, a fixing part arranged at one end of the inserting part, and a reaming part arranged at the other end of the inserting part; the fixing parts are connected with one end of the transmission shaft; the transmission shaft is used for driving the two drill bars to be crossly staggered away from each other along a hinge part in order that the two reaming parts are crossly staggered away from each other; the other end of the transmission shaft is connected with an external power mechanism. Compared with the prior art, the bottom reaming bit provided by the invention has the advantages that two hinged drill bars are skillfully taken as the drill rod, and the two drill bars are driven to be crossly staggered away from each other along a hinge shaft through the transmission shaft in order that the two reaming parts are crossly staggered away from each other, so that a reaming effect is achieved during rotation in holes needing to be reamed; during reaming by adopting the drill rod having the structure, the two reaming parts are staggered away from each other and recover flexibly and conveniently, so that the fault rate is low, and convenience is brought to insertion and pulling.

Description

technical field [0001] The invention relates to a reaming drill bit. Background technique [0002] At present, with the extensive use of expanded bottom anchor bolts, the best implementation method for expanded bottom anchor bolts is to expand the bottom inner diameter of the fixing hole so that the bottom inner diameter of the fixed hole is larger than the hole diameter, so that when the bottom of the expanded bottom anchor bolt is mechanically deformed, The outer diameter of the bottom of the expanded bottom anchor bolt is larger than the hole diameter, so that the expanded bottom anchor bolt is firmly fixed in the fixing hole. The drilling of this kind of bottom expansion fixed hole is comparatively complicated, generally first adopts common drill sleeve to drill hole, then uses bottom expansion drill bit, carries out hole expansion to the hole bottom or middle part; Existing bottom expansion drill bit comprises drill pipe, drill pipe end The expansion mechanism on the i...

AI Technical Summary

Problems solved by technology

However, there are also the following defects: when reaming, the piston sleeve moves downward to expand the hinged upper arm and lower arm outwards for reaming. During the reaming process, the hinge of the upper arm and the lower arm bears the largest force, and the hinge shaft is easily damaged Poor durability; and the upper arm and lower arm are easily deformed, which will cause the expanded upper arm and lower arm to fail to return, and the mechanism will not be able to be pulled out smoothly from the hole; or debris is stuck inside the expanded upper arm and lower arm, and It will cause the expanded upper arm and lower arm to fail to return, the mechanism will not be able to be pulled out smoothly from the hole, and the hole reaming efficiency is low

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