CN213012933U

CN213012933U - Shield-surface-shaped drill bit

Info

Publication number: CN213012933U
Application number: CN202020672626.8U
Authority: CN
Inventors: 梁友乾; 王丽霞; 李宗白; 刘武团; 梁婷; 万卷敏; 万昕奇; 高彦萍; 戚福军; 黄国贤; 李瓛; 张红
Original assignee: Northwest Research Institute of Mining and Metallurgy
Current assignee: Northwest Research Institute of Mining and Metallurgy
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2021-04-20
Anticipated expiration: 2030-04-28

Abstract

The utility model discloses a shield face shape drill bit belongs to metallurgical stove drilling tool field, has solved the problem that current drill bit life is low. The utility model comprises a drill bit body, wherein a plurality of alloy bases are uniformly distributed on the top surface of the drill bit body along the circumferential direction, a blind hole is arranged at the top of each alloy base, and a columnar tooth alloy is welded in each blind hole; a plurality of alloy grooves uniformly extend from the center of the top surface of the drill bit body, the alloy grooves are bent along the same direction, a bent alloy is welded in each alloy groove, and the shape of the bent alloy is matched with that of the alloy grooves. The utility model provides a columnar tooth alloy and crooked form alloy form the broken mode that combines together of impulse type and shear type respectively, can pinpoint, cascaded hierarchical footage prevents to open the indisputable mouthful in-process drill bit off tracking and aversion, on decomposing each columnar tooth alloy and crooked form alloy with impact force and broken task, improved the utilization ratio of alloy and the life of drill bit on the drill bit.

Description

Shield-surface-shaped drill bit

Technical Field

The utility model belongs to metallurgical stove drilling tool field, concretely relates to shield face shape drill bit.

Background

The tap hole machine is a common device in iron works, and has the function of opening a tap hole at a certain angle to ensure that molten iron smoothly flows out of a channel; therefore, the stability and the opening capability of the taphole drilling machine directly influence the yield and the process flow of the ironmaking blast furnace. The tapping machine mainly comprises a rotary part and a drilling part, wherein the drilling part mainly comprises a propelling part and a punching part, a drill bit is arranged at the front end of the punching part, the drill bit is formed by welding sheet alloy and a drill bit body in an electric welding mode or by assembling columnar tooth alloy and the drill bit body in an interference fit cold pressing mode, and the tapping machine is also formed by welding the sheet alloy or the columnar tooth alloy and the drill bit body by using common brass solder. Under the high-temperature condition when the iron notch is opened, the drill bit adopting the sheet alloy is scrapped in advance due to the fact that the sheet alloy has few stress points and large abrasion and can be passivated too early or the shearing force is too large to drop the sheet; the expansion coefficient of the drill bit columnar tooth alloy and the expansion coefficient of the drill bit body are different, so that the columnar tooth alloy falls off, and the drill bit is scrapped; the drill bit adopting the common brass for welding the columnar tooth alloy has the advantages that the columnar tooth alloy falls off due to poor shearing strength and low melting point of the common brass solder under the high-temperature condition, the service life of the drill bit is short, and the operation cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a shield face shape drill bit to solve the problem that current drill bit life is low.

The technical scheme of the utility model is that: a shield-face-shaped drill bit comprises a drill bit body, wherein a plurality of alloy bases are uniformly distributed on the top surface of the drill bit body along the circumferential direction, a blind hole is formed in the top of each alloy base, and columnar-tooth alloy is welded in each blind hole; a plurality of alloy grooves uniformly extend from the center of the top surface of the drill bit body, the alloy grooves are bent along the same direction, a bent alloy is welded in each alloy groove, and the shape of the bent alloy is matched with that of the alloy grooves.

As a further improvement, the center air hole that link up about the bit body center is equipped with, and the equipartition has the side ventilation hole of a plurality of slopes around the center air hole, and the side ventilation hole upwards extends to the bit body top surface to communicate with each other with the external world to one side.

As a further improvement of the utility model, the aperture ratio of the central air hole to the side vent hole is 2: 1.

As a further improvement of the utility model, the upper surface of the alloy base is an inclined plane, and the included angle between the inclined plane and the top surface of the drill bit body is 20-40 degrees.

As a further improvement of the utility model, the included angle between the central axis of the blind hole on the alloy base and the central axis of the drill bit body is 50-70 degrees.

As a further improvement of the utility model, the top of the curved alloy is in the shape of a knife edge.

As a further improvement of the utility model, the bending direction of the curved alloy is the same as the rotating direction of the drill bit.

As a further improvement of the utility model, the top of the alloy of the column teeth is in a shape of a hemisphere or a bullet head.

As a further improvement, the high-temperature welding flux is used for welding between the column tooth alloy and the blind hole and between the bent alloy and the alloy groove, and the melting point of the high-temperature welding flux is 1100-doped 1200 ℃.

As a further improvement of the utility model, 4 alloy bases are provided, and each alloy base is welded with 2 column-tooth alloys; 4 alloy grooves are arranged; the number of the side vent holes is 4.

The utility model has the advantages that:

1. the utility model arranges the curved alloy on the top of the drill bit body, welds the alloy base with the columnar-tooth alloy, and the curved alloy and the columnar-tooth alloy present abundant patterns on the top surface of the drill bit body to form a shield surface shape; the columnar tooth alloy and the bent alloy respectively form a crushing mode combining impact type crushing and shearing type crushing, accurate positioning and stepped stepping can be realized, deviation and displacement of a drill bit in the process of tapping are prevented, impact force and a crushing task are decomposed on each columnar tooth alloy and each bent alloy, and the utilization rate of the alloy on the drill bit and the service life of the drill bit are improved;

2. the included angle between the upper surface of the alloy base and the top surface of the bit body is 20-40 degrees, and the included angle between the central axis of the blind hole on the alloy base and the central axis of the bit body is 50-70 degrees, so that the design reduces the frictional resistance of the alloy base when an iron opening is formed, the scale can be rapidly advanced, the slag can be easily discharged, the rotation is balanced, the cutting is uniform, and the hole opening is regular;

3. the top of the columnar tooth alloy in the utility model is semi-spherical or bullet-shaped, which is easy to reach and ensures the wear-resistant strength of the alloy;

4. the bending direction of the curved alloy in the utility model is the same as the rotation direction of the drill bit, so that the rotation resistance can be greatly reduced, and the energy consumption and the alloy abrasion can be reduced;

5. the utility model provides a central wind hole is reasonable in design with the aperture proportion in side ventilation hole, easily ventilates and arranges the sediment, is favorable to advancing the tooth and reduces the alloy wearing and tearing and reduce the energy consumption of rig.

Drawings

Fig. 1 is a schematic front view of the present invention;

fig. 2 is a schematic top view of the present invention;

FIG. 3 is a sectional view taken along line B-B of FIG. 2;

fig. 4 is an assembly diagram of the middle stud alloy and the blind hole of the present invention.

In the drawings, 1-bit body; 2-alloy of columnar teeth; 3-a curved alloy; 4-an alloy base; 5-blind holes; 6-alloy tank; 7-central air hole; 8-side vent; 9-high temperature solder.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-4, a shield-face-shaped drill bit comprises a bit body 1, wherein a plurality of alloy bases 4 are uniformly distributed on the top surface of the bit body 1 along the circumferential direction, a blind hole 5 is formed in the top of each alloy base 4, and columnar-tooth alloys 2 are welded in the blind holes 5; a plurality of alloy grooves 6 uniformly extend from the center of the top surface of the bit body 1, the alloy grooves 6 extend from the center of the top surface of the bit body 1 to the alloy base 4, the alloy grooves 6 are curved in the same direction and are windmill-shaped, as shown in fig. 2, a curved alloy 3 is welded in each alloy groove 6, and the shape of the curved alloy 3 is matched with that of the alloy groove 6.

A central air hole 7 which is communicated up and down is formed in the center of the drill bit body 1, a plurality of inclined side vent holes 8 are uniformly distributed around the central air hole 7, and the side vent holes 8 extend obliquely upwards to the top surface of the drill bit body 1 and are communicated with the outside.

The aperture ratio of the central air hole 7 to the side vent holes 8 is 2: 1.

The upper surface of the alloy base 4 is an inclined surface, and the included angle alpha between the inclined surface and the top surface of the bit body 1 is 20-40 degrees.

The included angle beta between the central axis of the blind hole 5 on the alloy base 4 and the central axis of the drill bit body 1 is 50-70 degrees.

The top of the curved alloy 3 is in a knife edge shape, and the shape of the lower part of the curved alloy is matched with that of the alloy groove 6.

The bending direction of the curved alloy 3 is the same as the rotation direction of the drill.

The top of the alloy 2 is semi-sphere or bullet.

The columnar tooth alloy 2 and the blind hole 5, and the curved alloy 3 and the alloy groove 6 are welded by high-temperature solder 9, high-frequency induction welding is adopted, the melting point of the high-temperature solder 9 is 1100-1200 ℃, and the main components are Cu, Ni and Si.

4 alloy bases 4 are arranged, and 2 columnar tooth alloys 2 are welded on each alloy base 4; 4 alloy grooves 6 are arranged; the number of the side vent holes 8 is 4.

The utility model discloses a copper alloy solder is with the welding of postnotum alloy 2 in blind hole 5, and the melting point of copper alloy solder is 1100 ℃ -1200 ℃, is higher than the temperature of molten iron, and postnotum alloy 2 is difficult for droing, both high temperature resistant has certain toughness again, plays the effect of buffering to postnotum alloy 2.

The utility model discloses set up crooked form alloy 3 at 1 top surface of bit body, crooked form alloy 3 is windmill shape and arranges, welds cylindric alloy 2 on the alloy base 4, and 3 cylindric alloys 2 of crooked form demonstrate abundant decorative pattern at 1 top surface of bit body, form the shield shape of face. The columnar tooth alloy 2 and the bent alloy 3 respectively form a crushing mode combining impact type crushing and shearing type crushing, accurate positioning and stepped grading footage can be achieved, deviation and displacement of a drill bit in the process of opening an iron notch are prevented, impact force and a crushing task are decomposed to each columnar tooth alloy 2 and each bent alloy 3, the crushing area of the drill bit is crushed from small to large, and the utilization rate of the alloy and the service life of the drill bit are greatly improved.

The utility model discloses fully embodied the impacted style of drill bit and the unique design that the broken principle of shear line combined together, played the accurate positioning and effectively prevented opening iron notch in-process drill bit off tracking and aversion and cause the card to bore, damage iron notch scheduling problem.

Claims

1. A shield-face shaped drill bit comprising a bit body, characterized in that: a plurality of alloy bases (4) are uniformly distributed on the top surface of the drill bit body (1) along the circumferential direction, a blind hole (5) is formed in the top of each alloy base (4), and a columnar tooth alloy (2) is welded in each blind hole (5); evenly extend many alloy grooves (6) from bit body (1) top surface center department, alloy groove (6) are the bending form, and many alloy grooves (6) are crooked along the same direction, and the welding has bending form alloy (3) in every alloy groove (6), and the shape and the alloy groove (6) looks adaptation of bending form alloy (3).

2. The shield-shaped drill bit of claim 1, wherein: the center of the drill bit body (1) is provided with a center air hole (7) which is communicated up and down, a plurality of inclined side vent holes (8) are uniformly distributed around the center air hole (7), and the side vent holes (8) extend to the top surface of the drill bit body (1) in an inclined upward direction.

3. The shield-shaped drill bit of claim 2, wherein: the aperture ratio of the central air hole (7) to the side vent holes (8) is 2: 1.

4. A shield-face drill bit according to any one of claims 1-3, characterized in that: the upper surface of the alloy base (4) is an inclined surface, and the included angle between the inclined surface and the top surface of the bit body (1) is 20-40 degrees.

5. The shield-shaped drill bit of claim 4, wherein: the included angle between the central axis of the blind hole (5) on the alloy base (4) and the central axis of the bit body (1) is 50-70 degrees.

6. The shield-shaped drill bit of claim 5, wherein: the top of the curved alloy (3) is in a knife edge shape.

7. The shield-shaped drill bit of claim 6, wherein: the bending direction of the curved alloy (3) is the same as the rotation direction of the drill bit.

8. The shield-shaped drill bit of claim 7, wherein: the top of the columnar tooth alloy (2) is in a semi-spherical shape or a bullet shape.

9. The shield-shaped drill bit of claim 8, wherein: and high-temperature solders (9) are used for welding between the stud-tooth alloy (2) and the blind hole (5) and between the bent alloy (3) and the alloy groove (6), and the melting point of the high-temperature solders (9) is 1100-1200 ℃.

10. A shield-face drill bit according to claim 2 or 3, characterized in that: the number of the alloy bases (4) is 4, and each alloy base (4) is welded with 2 columnar tooth alloys (2); 4 alloy grooves (6) are arranged; the number of the side vent holes (8) is 4.