CN211500544U

CN211500544U - Novel polycrystalline diamond compact anchor rod drill bit

Info

Publication number: CN211500544U
Application number: CN201920614986.XU
Authority: CN
Inventors: 杨岗; 李卫华; 王小兵
Original assignee: Xian Jingwei Drilling Machines And Tools Manufacturing Co ltd
Current assignee: Xian Jingwei Drilling Machines And Tools Manufacturing Co ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-09-15
Anticipated expiration: 2029-04-30

Abstract

The utility model discloses a novel polycrystalline diamond compact anchor rod drill bit, which comprises a diamond compact (1) and a base (5), and is characterized in that the base (5) consists of a nest groove (2), a longitudinal front angle (3), a back backrest angle (4), internal and external threads (6) and a front inclined plane (7), and the diamond compact (1) is welded at the position of the base nest groove (2) and is used as a cutting tooth of the drill bit; the internal and external threads (6) are used for connecting a drill bit and a drill rod; moreover, a longitudinal included angle of 30-45 degrees is formed between the back rest of the socket groove (2) and the front vertical surface of the drill bit, and the longitudinal rake angle of the cutting teeth can be adjusted to be minus 1 degree to 20 degrees according to different rock stratums and the size of the outer diameter of the drill bit; the cutting teeth after welding are parallel to the connecting points of the inner corners or are intersected or differentially opened by 0-3 mm, so that the impact toughness, the drilling speed and the service life of the polycrystalline diamond compact can be effectively improved during drilling after improvement, the cost is effectively saved, and the labor intensity of operators is reduced.

Description

Novel polycrystalline diamond compact anchor rod drill bit

Technical Field

The utility model relates to a polycrystalline diamond compact stock drill bit for bore and get colliery anchor protecting wire net supporting hole.

Background

When a coal mine tunnel is tunneled, the safe, quick, efficient and stable anchor rod drill bit plays a key role, and the performance of the drill bit is directly related to the drilling efficiency and the drilling cost.

As shown in fig. 1 and 2, basically, the conventional diamond compact anchor rod drill bit for drilling a supporting mesh is to machine a socket for welding a diamond compact at the front end of a columnar steel body, machine a base (25 or 27, 28, 29, 30 and 32mm) with the same maximum diameter size according to drill bit parameters, and engage the radial welding plane diamond compact with the socket to form a cutting tooth of the drill bit.

Generally, there are two types of conventional diamond compact anchor drill bits, one is a full-flat diamond compact; and the other type is that a half-piece plane diamond compact piece cut from the central line of the whole plane is welded at the position of the socket.

Wherein, the longitudinal front foot angle of the cutting tooth welding socket groove is larger (10-15 degrees), which affects the drilling speed and the powder discharge; the back angle of the base is (30-45 degrees); its size directly affects the tooth feed speed and the cutting tooth strength. And, the whole piece and the half piece have the internal and external screw thread: the external thread is processed on the cylinder according to thread parameters, and the external surface of the external thread is provided with a screw thread for fastening.

The internal thread is a screw thread processed on the inner wall of the circular tube according to thread parameters and plays a role in fastening.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome not enough that traditional drill bit exists, provide a strong, advance efficient, the difficult novel polycrystalline diamond compact stock drill bit that collapses piece, long service life of tooth of impact toughness.

The utility model provides a technical scheme as follows that above-mentioned technical problem took:

a novel polycrystalline diamond compact anchor rod drill bit comprises a diamond compact and a base, and is characterized in that the base is composed of a socket groove, a longitudinal front angle, a back angle, internal and external threads and a front inclined plane, and the diamond compact is welded at the socket groove of the base and used as a cutting tooth of the drill bit; the internal and external threads are used for connecting the drill bit and the drill rod; and a longitudinal included angle of 30-45 degrees is formed between the backrest and the front vertical surface of the drill bit behind the socket.

Furthermore, the internal angles of the welded diamond composite sheets are intersected with the connecting lines in parallel.

Furthermore, the intersection of the internal angle parallel connecting lines of the welded diamond composite sheets is 0-3 mm.

Further, the drill bit cutting tooth rake angle is between minus 1 degree and 20 degrees.

After the technical scheme is adopted, the longitudinal rake angle of the cutting teeth of the novel polycrystalline diamond compact anchor rod drill bit is improved from the traditional 10-15 degrees to minus 1-20 degrees, and the corresponding internal angle connecting points of the welded cutting teeth are intersected or separated by 0-3 mm; the improvement is that the impact resistance of the cutting teeth is enhanced, and the front angle of the traditional cutting teeth is changed to minus 1 degree to 20 degrees on the premise of prolonging the service life, so that the cutting speed under different rock stratums is improved, the cost is saved, and the labor intensity of operators is reduced.

Drawings

The present invention will be described in detail with reference to the accompanying drawings so that the above advantages of the present invention can be more clearly understood.

Fig. 1 is a schematic structural diagram of an integral external thread diamond compact anchor rod drill bit of the present invention;

fig. 2 is a schematic structural diagram of a half-inner thread diamond compact anchor rod drill bit of the present invention;

fig. 3 is a schematic view of the welding structure of the diamond compact anchor rod drill bit of the present invention;

fig. 4 is a schematic view of the welding structure of the diamond compact anchor rod drill bit of the present invention;

fig. 5 is a schematic top view of the diamond compact anchor drill bit welding structure of the present invention;

FIG. 6 is a side schematic view of the socket, back corner, and cutting tooth rake angle of the present invention;

fig. 7 is a schematic view of the shape and structure of the front and side surfaces of a polycrystalline diamond compact according to the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

A novel polycrystalline diamond compact anchor bit, comprising: base, the whole piece of diamond compact and half, base nest groove and be used for connecting drill bit and drilling rod internal and external screw thread, wherein, polycrystalline diamond compact welds in base nest groove department and constitutes the drill bit cutting teeth, and wherein, polycrystalline diamond compact cutting teeth can be according to the size adjustment longitudinal rake angle number of different terranes and drill bit external diameter for minus 1 degree to 20 degrees.

Wherein, the cutting teeth after welding are close to the inner corner connecting points or are intersected or separated by 0-3 mm.

Referring to the drawings, wherein, fig. 1/2 is a schematic view of a base structure of a polycrystalline diamond compact anchor rod drill bit according to the present invention; fig. 3-5 are schematic structural diagrams of three viewing angles after the polycrystalline diamond compact of the diamond compact anchor rod drill bit of the present invention is embedded and welded; fig. 6 is a side view of the socket 2, back corner 4, and cutting tooth rake angle 3 of the present invention; fig. 7 is a schematic diagram of the shape and structure of the front and side surfaces of the diamond compact of the present invention;

according to the attached drawings, the anchor rod drill bit is composed of a base 5, a diamond composite sheet 1, a base socket groove 2, internal and external threads 6 and a front inclined plane 7, the diamond composite sheet 1 is welded at the socket groove 2 of the base and used as a cutting tooth of the drill bit, the angle of the front inclined plane 7 is determined according to the width of a welding surface of the drill bit outer diameter, and the parallel connecting lines 8 at the inner corners of the welded polycrystalline diamond composite sheet intersect or intersect by 0-3 mm; the internal and external threads 6 are used for connecting the drill bit and the drill rod.

More specifically, the base is composed of a socket 2, a longitudinal front angle 3, a back angle 4, an internal thread 6, an external thread 6 and a front inclined surface 7, and the diamond compact 1 is engaged with the socket 2 of the base 5 and welded together to be used as a cutting tooth of the drill. Wherein, the internal and external threads 6 are connected with the screw thread, and a longitudinal included angle of 30-45 degrees is formed between the back rest and the front vertical surface of the drill bit at the back of the socket 2.

After the technical scheme is adopted, the problems of internal angle chipping and drilling speed of the original drill bit are solved in the use of the polycrystalline diamond compact, because the change of the polycrystalline diamond compact and the longitudinal front angle 3 of the welding surface and the design of the parallel connecting line 8 of the internal angle of the welded polycrystalline diamond compact accord with the principle of rotational dynamics; the construction method has the advantages of high efficiency and long service life; saving cost and reducing labor intensity of operators.

It should be noted that the above-mentioned embodiments are only exemplary, and those skilled in the art can make various modifications and variations on the above-mentioned embodiments without departing from the scope of the invention.

It will be understood by those skilled in the art that the foregoing detailed description is for the purpose of illustration only and is not intended to limit the invention. The scope of the invention is defined by the claims and their equivalents.

Claims

1. The novel polycrystalline diamond compact anchor rod drill bit comprises a diamond compact (1) and a base (5), and is characterized in that the base (5) consists of a socket groove (2), a longitudinal front angle (3), a back rest angle (4), internal and external threads (6) and a front inclined plane (7), and the diamond compact (1) is welded at the socket groove (2) of the base and is used as cutting teeth of the drill bit; the internal and external threads (6) are used for connecting a drill bit and a drill rod; and a longitudinal included angle of 30-45 degrees is formed between the back rest of the socket groove (2) and the front vertical surface of the drill bit.

2. The novel polycrystalline diamond compact rock bolt bit of claim 1, wherein the parallel connecting lines of the internal angles of the welded diamond compact intersect.

3. The novel polycrystalline diamond compact rock bolt drill bit of claim 1, wherein the intersection of the parallel connecting lines of the internal angles of the welded diamond compact is 0-3 mm.

4. The new polycrystalline diamond compact rock bolt bit of claim 1, characterized in that the drill bit cutting tooth rake angle (3) is minus 1 to 20 degrees.