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Drill bit for expanding diameter

A technology for drill bits and holes, which is used in drill bits, drilling equipment, earth-moving drilling, etc., and can solve the problems of insufficient cutting stability of the independent cutting edge.

Pending Publication Date: 2022-04-15
傅丽兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is far from enough to rely solely on centrifugal force to maintain the cutting stability of the independent cutting edge. A restrictive structure that can control the independent cutting edge is needed to ensure the stability of drilling.

Method used

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  • Drill bit for expanding diameter
  • Drill bit for expanding diameter
  • Drill bit for expanding diameter

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] The present invention provides such Figure 1-6 The shown drill bit for expanding diameter includes a drill bit 1 for hole expansion, and the drill bit 1 for hole expansion is composed of a blade holder 101 and a drill shank 102. The blade holder 101 is a cylindrical body, combined with figure 2 with Figure 4 As shown, the first blade 2, the second blade 201 and the third blade 202 are arranged symmetrically on both sides of the blade holding seat 10...

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Abstract

The invention discloses a hole expanding drill bit, and relates to the field of concrete building punching tools, the hole expanding drill bit comprises a hole expanding drill bit body, the hole expanding drill bit body is composed of a blade holder and a drilling tool rod part, and a first blade, a second blade and a third blade are symmetrically arranged on the two sides of the blade holder; the drill bit has the beneficial effects that the water filling rotary joint arranged at the upper end of the drill bit for reaming is connected with an existing water pump through a water guide pipe to supply water, so that water is guided into the water filling cavity along the water guide cavity, and the water filling cavity is communicated with the water guide pipe; when the water filling cavity is filled with water, the water is guided downwards and acts on a shifting plate in the limiting structure, a sliding base and a limiting wedge-shaped pin rod are pressed downwards, the limiting wedge-shaped pin rod and a limiting oblique tooth groove formed in a guide rib part are tightly clamped, and the first cutting edge, the second cutting edge and the third cutting edge are effectively prevented from being pushed back inwards.

Description

technical field [0001] The invention relates to the field of punching tools for concrete buildings, in particular to a drill bit for diameter expansion. Background technique [0002] Expanding drills are used to insert straight cylindrical pre-drilled holes punched into building structures such as concrete, and use bottom drills to expand the diameter of the innermost part of the pre-drilled hole. [0003] For example, the publication number is CN106255573B, which discloses a drill bit for diameter expansion. The independent cutting edge part that moves radially outward by centrifugal force slides by virtue of its ribs being guided by the cutting edge opening of the cutting edge holding part, so as to achieve the desired alignment. Drilling efficiently grinds. However, it is far from enough to rely solely on centrifugal force to maintain the cutting stability of the independent cutting edge. A restrictive structure capable of controlling the independent cutting edge is need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/32E21B10/61E21B10/633E21B21/00
Inventor 傅丽兵
Owner 傅丽兵
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