Diameter adjustable drill bit and drilling machine

Abstract

The invention provides a diameter adjustable drill bit and a drilling machine and solves the problem of drilling diameter unadjustability in the prior art. The diameter adjustable drill bit comprisesat least two movable tool rests, a tool handle, a diameter adjusting module, an expansion core and a tool core, wherein the at least two movable tool rests are arranged in a circular mode and form aninternal big-end-up conical structure and an external big-end-up structure, and the outer wall and the lower end surface of every movable tool rest are provided with a plurality of tool bits; the lowend of the tool handle is provided with notches corresponding in number to the movable tool rest, and the movable tool rests are rotatingly arranged at the notches; the diameter adjusting module axially penetrates through the central hole of the tool handle, and the lower end of the diameter adjusting module is connected with the movable tool rests through connecting rods for driving the connecting rods to move up and down; the expansion core is in a big-end-up frustum structure, the upper end of the expansion core is fixed to the diameter adjusting module, and the outer wall of the expansioncore is in contact with the inner walls of the movable tool rests; the tool core is fixedly connected to the expansion core.

Description

technical field [0001] The invention relates to the field of construction equipment, in particular to a drill bit with adjustable drilling diameter and a hole digging machine. Background technique [0002] Manually excavated piles are also called "artificial hole piles", which refer to the foundation construction of houses, bridges and other projects. Due to the needs of pile formation, the pile foundation is excavated by manpower according to the design and needs to be poured with reinforced concrete below the ground. The process of spatial location. Manual excavation of piles is suitable for pile foundations with a diameter of more than 1m. Drilled piles or flush piles should be used for piles with a diameter of less than 1m. [0003] (1), fixed-point release [0004] According to the design drawings, determine the center point of the hole pile and the excavation line (including the retaining wall) of the hole pile with lime circle [0005] (2), forming holes [0006]...

AI Technical Summary

Problems solved by technology

[0019] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a drill bit and a hole digging machine with adjustable bore diameter, which is used to solve the problem that the bore diameter cannot be adjusted in the prior art

Images