CN214091722U

CN214091722U - Drill bit for rotary drilling machine

Info

Publication number: CN214091722U
Application number: CN202022819608.0U
Authority: CN
Inventors: 李慧芬
Original assignee: China Chemical Engineering Second Construction Corp
Current assignee: China Chemical Engineering Second Construction Corp
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-08-31
Anticipated expiration: 2030-11-30

Abstract

The utility model relates to a drill bit for rotary drilling machine, including protective shroud, drilling rod and knife tip, drilling rod end connection protective shroud, the knife tip is connected to the drilling rod head, is provided with the mud pipeline in the drilling rod, is provided with the mud export in drilling rod and knife tip junction, and the mud export communicates with the mud pipeline, and the equidistant a plurality of sawtooth that are provided with of cutting portion of knife tip. The utility model discloses rotary drill bit design science, simple structure, preparation are easy, easy and simple to handle, low cost, can effectually improve bored concrete pile pore-forming speed, very big improvement the efficiency of construction. But also can be recycled under similar geological conditions, and has higher practical value.

Description

Drill bit for rotary drilling machine

Technical Field

The utility model relates to a building engineering ground handles technical field, concretely relates to a drill bit for rotary drilling machine.

Background

In the construction process of foundation treatment of building engineering, the rotary drilling machine is widely applied to cast-in-place concrete cast-in-place pile construction at home and abroad due to the characteristics of convenient construction, low cost, high construction speed, high pile forming quality and the like. The rotary drilling machine drives the rotary device of the drilling machine to rotate by a power device, thereby driving a drill rod with a drill bit to rotate and cutting soil by the drill bit. The rotary drilling machine is mainly used for the construction of a cast-in-place pile for forming holes by using a slurry retaining wall, and the hole forming mode is a rotary hole forming mode.

When the concrete filling pile foundation is adopted for treatment, the drilling speed of a common drill bit is relatively low when the common drill bit meets the geology of cohesive soil, sand soil, a small amount of sand gravel and pebbles, the slurry outlet of the drill bit is easy to stick and drill in the drilling process of a hard plastic clay layer, the hole forming efficiency is low, and the construction period is severely limited.

Disclosure of Invention

An object of the utility model is to provide a drill bit for rotary drill machine, when aiming at solving among the above-mentioned background art at stickness soil, sand type soil, contain the concrete bored concrete pile foundation of a small amount of sand gravel, cobble type and handle, the rotary drill machine pore-forming that adopts ordinary drill bit is inefficient, seriously influences the technical problem of time limit for a project.

In order to solve the problem, the utility model provides a drill bit for rotary drilling machine, including protective shroud, drilling rod and knife tip, drilling rod end connection protective shroud, the knife tip is connected to the drilling rod head, is provided with the mud pipeline in the drilling rod, is provided with the mud export in drilling rod and knife tip junction, and the mud export communicates with the mud pipeline, and the equidistant a plurality of sawtooth that are provided with of cutting portion of knife tip.

Furthermore, the drilling machine also comprises three conical wing plates which are symmetrically arranged at equal intervals by taking the drill rod as an axis.

Furthermore, the cutting part of the conical wing plate is provided with a plurality of saw teeth at equal intervals.

Furthermore, the drill rod further comprises a balance weight which is fixed between every two conical wing plates of the drill rod.

Furthermore, two inclined grooves communicated with the slurry outlet are symmetrically arranged on two sides of the tool nose.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses rotary drill bit design science, simple structure, preparation are easy, easy and simple to handle, low cost, can effectually improve bored concrete pile pore-forming speed, very big improvement the efficiency of construction. But also can be recycled under similar geological conditions, and has higher practical value.

Drawings

Fig. 1 is a schematic view of the overall structure provided by the present invention.

1-retainer, 2-drill rod, 3-cutter point, 4-sawtooth, 5-conical wing plate and 6-counterweight.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, the present invention provides an embodiment: the utility model provides a drill bit for rotary drilling machine, includes retainer 1, drilling rod 2 and

knife tip

3, and 2 afterbody connection retainers 1 of drilling rod, 2 head connection knife tip 3 of drilling rod, are provided with the mud pipeline in the drilling rod 2, are provided with the mud export at

drilling rod

2 and 3 junctions of knife tip, and the mud export communicates with the mud pipeline, and the cutting portion equidistant of knife tip 3 is provided with a plurality of sawtooth 4.

In this embodiment, the saw teeth 4 are made of a firm and wear-resistant alloy, so that the cutting effect in the using process is guaranteed, the service life is greatly prolonged, and the influence of frequent replacement of drill bits on the construction efficiency and the construction period is avoided. The pitch of the adjacent saw teeth 4 may be set to 30mm, and the protruding height of the saw teeth 4 is preferably 5 mm. When a positive circulation rotary drilling machine is selected for construction, a rotary device of the rotary drilling machine drives a drilling tool to rotate and cut a soil layer, meanwhile, a slurry pump is used for conveying slurry to a slurry pipeline of a drill rod 2 to flush the bottom of a hole, the flushing fluid carrying rock debris rises along an annular space between the drill rod 2 and the hole wall and flows to a sedimentation tank from a hole opening, and the flushing fluid is purified and then used and repeatedly operated to form a positive circulation deslagging system; as the slag is continuously removed, the bore hole continues to extend downwardly until a predetermined hole depth is reached. When the drill bit drills in cohesive soil, sand soil, soil layers containing a small amount of sand gravel and pebble soil, the saw teeth 4 can effectively improve the contact area of the cutting part and the soil layers, so that the overall drilling efficiency is greatly improved, and the construction time is effectively saved. The drill bit in the embodiment has the advantages of scientific design, simple structure, easy manufacture, simple and convenient operation and low cost, can be repeatedly used in the soil layer drilling operation under similar geological conditions, can effectively reduce the construction cost, and has higher practical value.

In the preferred embodiment, the drill rod further comprises three conical wing plates 5, and the three conical wing plates 5 are symmetrically arranged at equal intervals by taking the drill rod 2 as an axis. The conical wing plate 5 is a solid conical wing plate 5, is arranged on the drill rod 2 between the retainer 1 and the tool nose 3, and the angle of the tip part is preferably set to be 30 degrees. In the drilling operation process, the drill rod 2 drives the conical wing plates 5 to rotate together, and meanwhile the conical wing plates 5 crush and cut surrounding soil layers, so that the overall drilling efficiency of the drill bit is further enhanced, and the consumption of the construction period is reduced.

In a preferred embodiment, the cutting portion of the conical wing plate 5 is provided with a plurality of saw teeth 4 at equal intervals. The distance between adjacent saw teeth 4 can be set to 30mm, and the height of the saw teeth 4 is preferably 5mm higher than the edge of the conical wing plate 5. The sawtooth 4 can effectively improve the area of contact of cutting part and soil layer, further improves holistic drilling efficiency, has practiced thrift the engineering time.

In the preferred embodiment, a counterweight 6 is also included, the counterweight 6 being fixed between each two conical wings 5 of the drill rod 2. The counter weight 6 can be made of solid round steel, the size of the round steel is preferably 60mm in diameter and 1.2m in length, and the round steel is firmly welded on a drill bit. The balance weights 6 need to be symmetrically arranged by taking the drill rod 2 as an axis so as to ensure the balance of the gravity center of the whole drill bit. The balance weight 6 can improve the whole dead weight of the drill bit, thereby increasing the bit pressure in the drilling construction process and further improving the drilling efficiency.

In a preferred embodiment, two inclined grooves communicated with the slurry outlet are symmetrically arranged on two sides of the tool nose 3. Two chutes are symmetrically cut at two sides of the tool nose along the slurry flow direction, and the height of each chute is 50 mm. The chute can further increase the mud outflow surface and effectively reduce the probability of blockage, thereby further ensuring the construction quality.

The drill bit has the advantages of scientific design, simple structure, easy manufacture, simple and convenient operation and low cost, can effectively improve the hole forming speed of the cast-in-place concrete pile, and greatly improves the construction efficiency. And the drill bit can be recycled under similar geological conditions, and has higher practical value.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a drill bit for rotary drilling machine, includes retainer, drilling rod and knife tip, the drilling rod foot section connects the retainer, the drilling rod head is connected the knife tip, be provided with the mud pipeline in the drilling rod and knife tip junction are provided with the mud export, the mud export with mud pipeline intercommunication, its characterized in that: the cutting part of the cutter point head is provided with a plurality of saw teeth at equal intervals.

2. The drill bit for a rotary drill of claim 1, wherein: the drilling rod drilling device further comprises three conical wing plates, and the three conical wing plates are symmetrically arranged at equal intervals by taking the drilling rod as an axis.

3. The drill bit for a rotary drill of claim 2, wherein: the cutting part of the conical wing plate is provided with a plurality of sawteeth at equal intervals.

4. The drill bit for a rotary drill of claim 2, wherein: the drill rod further comprises a balance weight which is fixed between every two conical wing plates of the drill rod.

5. The drill bit for a rotary drill of claim 1, 2, 3 or 4, wherein: two inclined grooves communicated with the slurry outlet are symmetrically arranged on two sides of the tool nose.