CN210370507U

CN210370507U - Boron nitride diamond bit for coal mine

Info

Publication number: CN210370507U
Application number: CN201921206549.0U
Authority: CN
Inventors: 石磊; 张乐
Original assignee: Datong Ande Solid Engineering Plastic Product Co Ltd
Current assignee: Datong Ande Solid Engineering Plastic Product Co Ltd
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2020-04-21
Anticipated expiration: 2029-07-29

Abstract

The utility model discloses a boron nitride diamond bit for coal mine is two wings integral type drill bits, including two cutting wings (11) along radial symmetric distribution and opposite direction, cutting wing (11) are connected with drill handle (2) through wing seat (12), and the outside surface of two cutting wings (11) all is equipped with guarantor footpath strip (15). The gauge protection strip (15) is in a long strip shape, is parallel to the axial direction of the drill bit, and is welded on the outer side surface of the cutting wing (11); the upper end of the gauge strip (15) is flush with the upper end of the cutting wing (11). The boron nitride diamond drill bit for the coal mine is of a two-wing integral type, and is firm in welding, better in wear resistance and longer in service life. Wherein, the gauge strip can fully ensure the diameter and the circumference of the hole under the condition that the drill bit is continuously worn.

Description

Boron nitride diamond bit for coal mine

Technical Field

The utility model relates to a diamond bit technical field especially relates to a boron nitride diamond bit.

Background

At present, with the development of the coal mine industry, bolting technology is widely used, and the demand of jumbolters is sharply increased. Most of coal mine drilling machines are rotary type, rotary type anchor rod hole drilling has certain advantages, but the rotary type anchor rod hole drilling machine is widely applied to various rocks and needs to be matched with a proper drill bit.

The anchor rod drill bit commonly used for supporting and drilling the coal mine tunnel is a PDC anchor rod drill bit made of hard alloy and diamond composite sheets. These bits are mostly half-piece and are subject to wear during use, over time, without guaranteeing the diameter and circumference of the drilled hole. Also, the smaller the bit diameter, the faster the wear and the shorter the life.

Therefore, there is a need to develop a new drill bit with better wear resistance and longer life.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a boron nitride diamond bit for coal mine.

In order to achieve the above object, the utility model discloses a technical scheme specifically as follows:

the utility model provides a boron nitride diamond bit for coal mine, is two wings integral type drill bits, includes two cutting wings along radial symmetric distribution and opposite direction, the cutting wing is connected with the drill bit handle through the wing seat, and the outside surface of two cutting wings all is equipped with the gauge protection strip.

The gauge protection strip is in a strip shape, is parallel to the axial direction of the drill bit, and is welded on the outer side surface of the cutting wing; the upper end of the gauge strip is flush with the upper end of the cutting wing.

The upper part of the cutting wing is provided with a circular cutting surface which is an inclined upward plane and faces to the rotating direction of the drill bit.

Wherein, the upper portion of cutting wing still is equipped with arc chip groove, arc chip groove back of the body is to the direction of rotation of drill bit.

Wherein, the outer surface of the drill handle is provided with threads. The center of the drill handle is provided with a water outlet hole which is communicated up and down. The outer side surface of the drill handle is provided with a chip groove parallel to the axial direction of the drill.

Wherein, the wing seat is in an arc inverted frustum shape. The cutting wing, the wing seat and the drill bit handle are of an integrated structure.

Wherein, the distance between the outermost side of the cutting wing and the central line of the drill bit is larger than the radius of the drill bit handle.

The drill bit is formed by compounding polycrystalline cubic boron nitride and a hard alloy substrate, and is suitable for medium-hard rock with F being more than or equal to 10.

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

(1) the utility model discloses a guarantor footpath strip has respectively been welded to drill bit both wings outside portion. Because the anchor rod drill bit continuously penetrates into a coal seam, the common drill bit can drill holes more and more thinly due to continuous abrasion of the drill bit, and the diameter of the holes cannot be ensured, so that the diameter-protecting strips are respectively welded on two wings of the drill bit, and the diameter and the circumferential degree of the holes can be fully ensured under the condition that the drill bit is continuously abraded.

(2) The utility model discloses a drill bit is threaded connection's two wing whole piece formula boron nitride alloy anchor rod drill bit, than half piece formula welding in the past more firm and the wearability better, the life-span is longer.

(3) The utility model discloses a drill bit diameter can accomplish below 3.5cm, still can keep good wearability and life.

The boron nitride diamond drill bit for coal mine of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

Drawings

Fig. 1 is a perspective view of a boron nitride diamond drill bit for coal mines according to the present invention;

FIG. 2 is a top view of the boron nitride diamond drill bit for coal mines according to the present invention;

fig. 3 is another perspective view of the boron nitride diamond drill bit for coal mine according to the present invention.

Detailed Description

As shown in fig. 1 to 3, a boron nitride diamond drill bit for coal mines is a two-wing whole-piece type drill bit, and comprises two cutting wings 11 which are symmetrically distributed along the radial direction and have opposite directions, wherein the cutting wings 11 are connected with a drill bit shank 2 through wing seats 12, and the outer side surfaces of the two cutting wings 11 are provided with gauge protection strips 15. The gauge protection strip 15 is in a long strip shape, is parallel to the axial direction of the drill bit, and is welded on the outer side surface of the cutting wing 11; the upper end of the gauge strip 15 is flush with the upper end of the cutting wing 11, and the diameter and circumference of the hole can be sufficiently secured in the case where the drill is continuously worn.

The upper portion of the cutting wing 11 is provided with a circular cutting surface 13, and the circular cutting surface 13 is an upward inclined plane and faces the rotation direction of the drill bit, and can rapidly break rock walls and break rocks into rock debris in a high-speed rotation state.

The upper portion of cutting wing 11 still is equipped with arc junk slot 14, arc junk slot 14 back to the direction of rotation of drill bit for the detritus that forms after destroying the cliff is discharged fast behind the drill bit along arc junk slot 14.

The outer surface of the drill handle 2 is provided with threads for threaded connection with a drill rod. The central authorities of drill handle 2 are equipped with apopore 22 that link up from top to bottom, and when the high-speed rotatory broken wall of drill bit, the drill bit position produced high temperature, and through 2 water injections of apopore to the drill bit cooling to lubricate when drilling the drill bit. The outer side surface of the drill bit handle 2 is provided with a chip groove 21 parallel to the axial direction of the drill bit, so that rock debris can be further discharged out of the drilled hole conveniently.

The wing seats 12 are in the shape of an arc inverted frustum. The cutting wing 11, the wing seat 12 and the drill handle 2 are of an integrated structure; the outermost side of the cutting wings 11 is at a greater distance from the centre line of the drill bit than the radius of the drill bit shank 2.

The parameter table of the drilling regulation of the drill bit is as follows:

the above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.

Claims

1. The utility model provides a boron nitride diamond bit for coal mine which characterized in that: the two-wing integral-piece drill bit comprises two cutting wings (11) which are symmetrically distributed along the radial direction and have opposite directions, wherein the cutting wings (11) are connected with a drill bit handle (2) through wing seats (12), and the outer side surfaces of the two cutting wings (11) are provided with diameter-protecting strips (15).

2. The boron nitride diamond drill bit for coal mines as set forth in claim 1, wherein: the gauge protection strip (15) is in a long strip shape, is parallel to the axial direction of the drill bit, and is welded on the outer side surface of the cutting wing (11); the upper end of the gauge strip (15) is flush with the upper end of the cutting wing (11).

3. The boron nitride diamond drill bit for coal mines as set forth in claim 2, wherein: the upper part of the cutting wing (11) is provided with a circular cutting surface (13), and the circular cutting surface (13) is an inclined upward plane and faces the rotating direction of the drill bit.

4. The boron nitride diamond drill bit for coal mines as set forth in claim 3, wherein: the upper portion of cutting wing (11) still is equipped with arc chip groove (14), arc chip groove (14) back to the direction of rotation of drill bit.

5. The boron nitride diamond drill bit for coal mines as set forth in claim 4, wherein: the outer surface of the drill handle (2) is provided with threads.

6. The boron nitride diamond drill bit for coal mines as set forth in claim 5, wherein: the center of the drill handle (2) is provided with a water outlet hole (22) which is communicated up and down.

7. The boron nitride diamond drill bit for coal mines as set forth in claim 6, wherein: the outer side surface of the drill handle (2) is provided with a chip groove (21) parallel to the axial direction of the drill.

8. The boron nitride diamond drill bit for coal mines as set forth in claim 7, wherein: the wing seat (12) is in an arc inverted frustum shape.

9. The boron nitride diamond drill bit for coal mines as set forth in claim 8, wherein: the cutting wing (11), the wing seat (12) and the drill handle (2) are of an integrated structure; the distance between the outermost side of the cutting wing (11) and the center line of the drill bit is larger than the radius of the drill bit handle (2).

10. The boron nitride diamond drill bit for coal mines as set forth in claim 9, wherein: the drill bit is formed by compounding polycrystalline cubic boron nitride and a hard alloy substrate.