A reaming drill bit for rotary drilling

Abstract

The invention discloses a reamer bit for an abrasion drill. The reamer bit comprises a bit body (1), a connecting rod (2) and two connection rods (3). Reaming plates (4) are arranged in holes in the two sides of the bit body (1) respectively, the upper ends of the reaming plates (4) are hinged to the bit body (1), and a plurality of drill teeth (5) are arranged on the reaming plates (4). The connecting rod (2) is arranged in a directional sleeve (8) in the bit body (1). The bottom of the connecting rod (2) is hinged to the two connection rods (3). One ends of the two connection rods (3) are hinged. The other ends of the two connection rods (3) are hinged to the reaming plates (4) on the two sides respectively. A base (15) is arranged at the position, corresponding to the directional sleeve (8), of a base plate (7) of the bit body (1), and a slurry circulation hole I (10) is formed in the position, corresponding to the directional sleeve (8), of the base plate (7) of the bit body (1). The reamer bit is simple in structure, easy and convenient to operate, good in reaming construction quality and high in construction speed.

Description

technical field [0001] The invention relates to a drill bit, in particular to a reaming drill bit for rotary drilling, and belongs to the technical field of pile foundation bottom expansion construction. Background technique [0002] At present, with the rapid advancement of urbanization in my country, the scale of urban infrastructure construction is increasing, and pile foundations are widely used in engineering design and construction. In the design of pile foundation, in order to improve the bearing capacity of the pile foundation and save materials and investment, expanded bottom piles are usually used. [0003] At present, most of the pile foundation constructions are bored reaming piles, and the bored reaming piles usually adopt drilling rigs to expand, and the key to completing the drilling rig expansion construction is to adopt effective reaming drill bits. Existing reaming drill bits are mostly used for rotary drilling. Due to the high cost of rotary drilling, hig...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a reaming drill for rotary drilling in view of the defects that the existing reaming drills are mostly used for rotary drilling, and the diameter of the bottom expansion is difficult to guarantee.

Images