Reamer

Abstract

The invention provides a reamer. The reamer comprises a middle shaft and an outer sleeve drill which are coaxial, wherein the lower end of the middle shaft is a drill bit or a positioning end; the outer sleeve drill consists of a plurality of groups of connecting rod type drills with the same size which are uniformly distributed on the circumferential side of the middle shaft; each connecting rodtype drill consists of two drill arms which are connected by a movable joint; the upper end of an upper drill arm of each connecting rod type drill is fixed at the upper end of the middle shaft and ismovably fixed on a pin shaft; the upper end of the middle shaft is provided with a shaft seat of the pin shaft; the lower end of a lower drill arm of each connecting rod type drill is movably fixed at the lower end of the middle shaft by a second pin shaft, and the upper part of the drill bit is sleeved on a ferrule of the middle shaft; the ferrule is provided with a shaft seat of the second pinshaft; and when the ferrule slides on the middle shaft, the two drill arms in each group of the connecting rod type drills are driven to be opened or closed. The outer side of the lower drill arm of each connecting rod type drill is made of hard metal, particularly a plurality of welded alloy blocks or an alloy steel bar, and the reamer is used for cutting and drilling a rock stratum, and can be applied to a common hard stratum by using common quenched steel.

Description

Technical field [0001] The invention relates to drilling tools used for foundation construction of various construction projects, in particular to a reaming drill bit. Background technique [0002] At present, large-diameter drilling tools need to be used in the construction of large-diameter drilling in various constructions or transportation bridges remote to slope protection and other projects, especially the variable-diameter steel cage invented by the applicant and inventor of the present invention. In response to this demand, the applicant’s previous patent applications include but are not limited to: CN2017211488836, a variable diameter steel cage and anchor rod, CN2017213763240 a balloon expansion variable diameter steel cage and anchor rod, and CN2017211496584 an anchor rod member , CN2017208194362 A device to overcome the construction deformation of anti-floating and tensile anchor rods. The variable-diameter steel cage needs to be drilled at the lower end of the drill...

AI Technical Summary

Problems solved by technology

Generally speaking, the efficiency of the prior art is low, the desired effect cannot be achieved, and the waste of drill bits is large, so it is difficult to solve the problems in the construction of the present invention

[0004] The existing rotary drilling rigs mainly have problems such as difficult rock entry, slow construction efficiency, high cost, and difficulty in ensuring the quality of pile holes.

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