KR20140138397A - Drilling bit - Google Patents

Abstract

The present invention relates to a drilling bit capable of facilitating installation of a steel pipe using a wing bit capable of being folded, comprising: a bit body having an excavation surface formed on one side and a guide groove formed on the other side; A wing bit which is formed on one side of the shaft body and can be guided along the guide groove of the bit body and can be assembled with the bit body on the basis of the shaft protrusion guided along the guide groove, And a stopper member provided on the bit body such that the shaft protrusion is not separated from the guide groove.

Description

Drilling bit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a milling apparatus and method, and more particularly, to a drilling bit capable of facilitating the installation of a steel pipe using a foldable wing bit.

Generally, the steel pipe grouting method is an underground excavation assist method that improves the water quality while reinforcing the ground. By installing the steel pipe on the ground and injecting the grout material into the inside of the steel pipe, the steel pipe and the ground are integrally It is characterized by increasing the soil and the shear strength of the rock mass. It is very advantageous in terms of workability and economical efficiency because the injection is performed in the steel pipe.

Such a steel pipe grouting method has been established and widely used as a tunnel reinforcement method in recognition of its effect.

Generally, the steel pipe grouting method includes a step of drilling a ground, a step of inserting a steel pipe provided with a strainer (grout reinjecting part) into the perforated hole, a step of injecting a sealing material between the steel pipe and the perforation hole, While injecting cement.

However, since this method proceeds by inserting the steel pipe after the perforation, there is a problem that it is difficult to insert the steel pipe due to collapse of the perforation hole or mixing of foreign materials in the soft soil layer where the perforation hole is not naturally held.

In order to solve the above problems, a technique has been developed in which a steel pipe can be easily installed using a foldable wing bit as disclosed in Korean Patent Registration No. 100919628.

However, such a conventional foldable wing bit is a separate component in which the wing bit and the pin are separated from each other by hinging the wing bit to the bit body by assembling the pin, which is a separate component from the bit body, There is a serious problem that the wing bit and the pin are finely collided with each other due to the great external force and impact generated in the excavation process and the gap is widened or the wing bit or pin is broken.

Since the pin is assembled through the bit body, a part of the pin is exposed, and various foreign substances can easily penetrate between the pin and the gap of the bit body caused by a great external force and impact generated during the excavation process. There is a problem in that the durability becomes very weak such as interfering with the folding or even detaching the pin from the bit body.

In addition, the conventional pins are coupled to the bit body in a deteriorated manner, so that it is very difficult to separate the wing bits in order to repair or replace the wing bits.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a wing bit and an axial protrusion which are resistant to external force and impact, And it is an object of the present invention to provide a drilling bit which can remarkably improve durability and which facilitates the repair and replacement of wing bits by using a detachable stopper member. However, these problems are exemplary and do not limit the scope of the present invention.

According to an aspect of the present invention, there is provided a drill bit comprising: a bit body having an excavation surface formed on one side and a guide groove formed on the other side; A wing bit which is formed on one side of the shaft body and can be guided along the guide groove of the bit body and can be assembled with the bit body on the basis of the shaft protrusion guided along the guide groove, And a stopper member provided on the bit body such that the shaft protrusion is not separated from the guide groove.

According to an aspect of the present invention, the bit body includes a wing bit accommodating groove having a shape corresponding to a part of the wing bit on one side thereof, and a stopper accommodating groove having a shape corresponding to a part of the stopper member on the other side And the guide groove may be formed on the inner wall surface of the wing bit receiving groove.

In addition, according to an aspect of the present invention, the guide groove may be inclined at an axial projection angle with reference to the excavation progress direction.

According to an aspect of the present invention, the guide groove may include a first directional groove formed in a first direction and a second directional groove connected to the first directional groove and formed in a second direction.

According to an aspect of the present invention, the guide groove may have an inner diameter surface having a rounded end.

According to an aspect of the present invention, the guide groove may be a wedge-shaped groove having a relatively narrow width from the entrance to the middle and a relatively wide width at the end.

According to an aspect of the present invention, the wing bit is formed with axle protrusions on both sides thereof, a first excavation surface formed on a lower surface thereof, a second excavation surface on the front surface, a third excavation surface inclined to a part of the front surface, , And a rounded outer surface may be formed on the rear surface.

Further, according to the idea of the present invention, the shaft projection is formed integrally with the wing bit, and has a cross section of at least a circular shaft projection, a ring-shaped shaft projection, a split circular shaft projection divided equiangularly into a plurality of pieces, A split ring-shaped axial projection in an equally divided manner, an elliptical axial projection, a partially flat circular axial projection, and a combination thereof.

According to an aspect of the present invention, the stopper member may include a stopper body, which is a generally ring-shaped stopper through which the threaded portion of the bit body passes; A stopper arm formed on one surface of the stopper body and inserted into a stopper receiving groove formed at a guide groove entrance of the bit body; . ≪ / RTI >

According to an aspect of the present invention, the stopper member may further include an axial projection support finger formed on the stopper arm and having a concave support groove to be in contact with a part of the axial projection.

The excavation bit according to an aspect of the present invention may further include a guide device formed on the bit body and screwed to the threaded portion of the bit body passing through the stopper member and fixing the stopper member to the bit body .

According to some embodiments of the present invention as described above, it is possible to improve the durability, accuracy, reliability and performance of the apparatus by preventing the wing bit from deviating from the external force and shock generated during excavation, Thereby facilitating repair and replacement, thereby facilitating management of the apparatus. Of course, the scope of the present invention is not limited by these effects.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an exploded cross-sectional view of an excavating bit according to some embodiments of the present invention.
2 is a cross-sectional view of the component assembly of Fig.
Fig. 3 is an exploded perspective view of the component of Fig. 1. Fig.
Fig. 4 is an enlarged sectional view showing the guide groove of Fig. 1 in an enlarged manner. Fig.
5 is an enlarged cross-sectional view showing another example of the guide groove of Fig.
Fig. 6 is an enlarged cross-sectional view showing another example of the guide groove of Fig. 4;
FIG. 7 is a perspective view showing the wing bit of FIG. 1; FIG.
Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 7;
Figs. 9 to 15 are sectional views showing still another example of Fig.
Fig. 16 is a bottom view of Fig. 2; Fig.
Figure 17 is a bottom view of an excavating bit according to some other embodiments of the present invention.
18 is a perspective view showing the stopper member of Fig.
19 is a perspective view showing another example of Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated" or "coupled to" another element, It will be appreciated that elements may be directly "on", "connected", "laminated" or "coupled" to another element, or there may be other elements intervening therebetween. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, it is interpreted that there are no other components intervening therebetween do. Like numbers refer to like elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, in the figures the elements are turned over so that the elements depicted as being on the top surface of the other elements are oriented on the bottom surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure. If the elements are oriented in different directions (rotated 90 degrees with respect to the other direction), the relative descriptions used herein can be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

Fig. 1 is a fragmentary cross-sectional view showing a drill bit 100 according to some embodiments of the present invention, Fig. 2 is a part assembly sectional view of Fig. 1, Fig. 3 is an exploded perspective view of the component of Fig. 1 is an enlarged sectional view showing an enlarged view of the guide groove 10b in Fig.

1 to 4, a drilling bit 100 according to some embodiments of the present invention includes a bit body 10, a wing bit 20, and a stopper member 30 .

1 and 2, the bit body 10 is formed with an excavation surface 10a on one side of which a cemented carbide tip T is installed and a guide groove 10b on the other side A wing bit receiving groove 11 having a shape corresponding to a part of the wing bit 20 is formed on one side and a stopper receiving groove 12 having a shape corresponding to a part of the stopper member 30 is formed on the other side And the guide groove 10b may be a kind of metal block formed on the inner wall surface of the wing bit receiving groove 11. [

4, the guide groove 10b may be formed to be inclined at an axis projection entering angle A with reference to the excavation progressing direction F. As shown in FIG.

As shown in Fig. 4, the guide groove 10b may have a straight shape and an inner diameter surface 10d having a rounded end.

1 and 4, the shaft protrusion 21 of the wing bit 20 slants into the guide groove 10b at an angle of incidence of the shaft protrusion A, And can be completely inserted up to the opening 10d.

5 is an enlarged cross-sectional view showing another example of the guide groove 10b of Fig.

5, the guide groove 10e includes a first direction groove 10f formed in a first direction and a second direction groove 10f connected to the first direction groove 10f, (10g).

5, the shaft protrusion 21 of the wing bit 20 first enters the first direction groove 10f and then is completely inserted into the second direction groove 10f .

6 is an enlarged sectional view showing still another example of the guide groove 10b of Fig.

As shown in FIG. 6, the guide groove 10h may be a wedge-shaped groove having a relatively narrow width W1 and a relatively wide width W2 from the entrance to the middle.

6, the axial projection 28 of the wing bit 20 passes through the inlet of the guide groove 10h with a relatively narrow width W1 at a certain angle, And reaches the end of the guide groove 10h having the groove W2 and can be rotated at a free angle.

1 to 4, the wing bit 20 includes a shaft protrusion 21 which can be guided along the guide groove 10b of the bit body 10 at one side thereof And a metal block that can be assembled and rotated with respect to the bit body 10 with reference to the shaft protrusion 21 guided along the guide groove 10b.

Fig. 7 is a perspective view showing the wing bit 20 of Fig. 1, Fig. 8 is a cross-sectional view showing a cutting plane VIII-VIII of Fig. 7, Figs. 9 to 15 are sectional views showing other examples of Fig. 1 is a bottom view of Fig.

7, the wing bit 20 has axle protrusions 21 formed on both sides thereof, a first excavation surface 20a formed on a lower surface thereof, a second excavation surface 20b formed on the entire surface thereof, A third excavation surface 20c inclined to a part of the front surface, and a round outer surface 20d on the rear surface.

Here, cemented carbide tips T may be installed on the first excavation surface 20a, the second excavation surface 20b, and the third excavation surface 20c.

7, the shaft protrusion 21 is integrally formed with the wing bit 20 and protrudes in the direction of the guide groove 10b of the bit body 10b, 8, it may be an axial projection 21 whose cross section is circular.

In addition, the axial projection 21 may be formed in a wide variety of shapes that can be loosely or forcibly inserted into the guide groove 10b, and may be a ring-shaped axial projection 22 as shown in FIG. 9 , As shown in Fig. 10, may be an equally divided split circular shaft projection 23 in two pieces, and may be an equally divided divided circular shaft projection 24 in four pieces, as shown in Fig. . Here, the divided circular shaft projections 23 and 24 may be divided into two or more.

12, the axial projection may be a split ring-shaped axial projection 25 that is equally divided into two pieces, and as shown in Fig. 13, And may be a split ring-shaped axial projection 26. [ Here, the split ring-shaped axial projections 25 and 26 may be divided into two or more.

14, the axial projection may be an elliptical axial projection 27, and may be a partially flat circular axial projection 28, as shown in Fig.

In addition, the shaft protrusions 21 can be applied to various types of shaft protrusions that can be inserted into the guide grooves 10b of the bit body 10.

Fig. 16 is a bottom view of Fig. 2; Fig.

16, two wing bits 20 are provided on the right and left sides of the bit body 10 so as to protrude from the bit body 10, And can be excavated over a large area.

Here, when excavating, a working fluid such as air or water may be introduced into the working fluid inlet groove G1, and the excavated foreign matter may be discharged along the working fluid discharge groove G2.

2, the wing bit 20 is folded in the direction of the bit body 10 while being rotated about the shaft projection 21, and the inner diameter of the steel pipe You can easily escape to the surface.

17 is a bottom view showing a drill bit 200 in accordance with some other embodiments of the present invention.

17, three wing bits 20 may be provided on the side surface of the bit body 10 so as to protrude from the bit body 10. In addition, two or more wing bits 20 may be provided on the bit body 10, such as four wing bits.

1 to 4, the stopper member 30 is installed on the bit body 10 and is inserted into the guide groove 10b so that the shaft protrusion 21 is not separated from the guide groove 10b. And may be a kind of metal block provided adjacent to the inlet 10c of the groove 10b.

18 is a perspective view showing the stopper member 30 in Fig.

18, the stopper member 30 is formed on one surface of the stopper body 31 and the ring-shaped stopper body 31 through which the threaded portion 13 of the bit body 10 passes, And a stopper arm 32 inserted into the stopper receiving groove 12 formed at the entrance 10c of the guide groove 10b of the bit body 10.

1 and 4, the shaft protrusion 21 of the wing bit 20 slants into the guide groove 10b at an angle of incidence of the shaft protrusion A, When the stopper member 30 is installed on the bit body 10 to close the inlet 10c of the guide groove 10b as shown in FIG. 2, The shaft protrusion 21 of the wing bit 20 is axially supported by the round inner diameter surface 10d of the guide groove 10b so that the wing bit 20 can be folded without being detached from the bit body 10. [

Therefore, since the wing bit 20 and the shaft projection 21 are integrally formed as one unit, it is possible to prevent the collision between the components from being originally supported, so that the wing bit 20 can be firmly supported even under the great external force and shock generated during the excavation process. 20 are inserted into the guide groove 10b without being exposed to the outside of the bit body 10, the penetration of various foreign substances is blocked, thereby preventing malfunction or malfunction, and remarkably improving durability Since the wing bit 20 can be easily repaired or replaced by removing the stopper member 30, the manageability of the apparatus can be greatly improved.

19 is a perspective view showing another example of Fig.

19, the stopper member 30 is formed on the stopper arm 32 and includes an axial projection supporting finger 33a having a concave support groove 33a to be in contact with a part of the axial projection 21 33). Therefore, as shown in FIG. 19, a part of the shaft protrusion 21 contacts the support groove 33a of the stopper member 30, so that the shaft protrusion 21 can be more firmly rotatably supported.

1 to 3, a drilling bit 100 according to some embodiments of the present invention may be formed on the bit body 10 so that the bit of the bit passing through the stopper member 30, And a guide device 40 screwed to the threaded portion 13 of the body 10 and fixing the stopper member 30 to the bit body 10.

Here, the threaded portion 13 may be formed in a conical shape so that the threaded portion 13 can be easily fastened to the guide device 40 even when the threaded portion 13 is rotated a small number of times.

1 and 3, the shaft protrusion 21 of the wing bit 20 enters the guide groove 10b and is completely inserted to the rounded inner diameter surface 10d. Thereafter, as shown in FIGS. 1 and 3, The stopper member 30 is installed on the bit body 10 to close the entrance 10c of the guide groove 10b and the bit body 10 is inserted into the guide device 40, The shaft protrusion 21 of the wing bit 20 is axially supported by the round inner diameter surface 10d of the guide groove 10b so that the wing bit 20 is inserted into the bit body 10, It can be folded without being detached from.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: bit body
10a: excavation surface
10b, 10e: guide groove
10c: entrance
10d: round inner surface
10f: first direction groove
10g: second direction groove
10h: guide groove
W1, W2: Width
11: Wing bit accommodating groove
12: Stopper housing groove
13:
20: Wing beat
20a: first excavation surface
20b: second excavation surface
20c: third excavation surface
20d: round outer surface
21: Axial projection
22: Ring-shaped shaft projection
23, 24: split circular shaft projection
25, 26: Split ring type shaft projection
27: Oval shaft projection
28: Partial circular axis projection
F: Direction of excavation
A: Angle of entering the shaft projection
G1: Working fluid injection groove
G2: Working fluid discharge groove
30: Stopper member
31: Stopper body
32: Stopper arm
33a: Support groove
33: Axial projection support finger
40: Guide device
100: Excavating bit

Claims (11)

A bit body having an excavation surface formed on one side and a guide groove formed on the other side;
A wing bit which is formed on one side of the shaft body and can be guided along the guide groove of the bit body and can be assembled with the bit body on the basis of the shaft protrusion guided along the guide groove, And
A stopper member provided on the bit body such that the shaft protrusion is not separated from the guide groove;
. The method according to claim 1,
The bit body has a wing bit accommodating groove having a shape corresponding to a part of the wing bit on one side and a stopper receiving groove having a shape corresponding to a part of the stopper member on the other side, Wherein the bit-receiving groove is formed on an inner wall surface of the bit-receiving groove. The method according to claim 1,
Wherein the guide groove is inclined at an axial projection angle with reference to the excavation progressing direction. The method according to claim 1,
Wherein the guide groove includes a first directional groove formed in a first direction and a second directional groove connected to the first directional groove and formed in a second direction. The method according to claim 1,
Wherein the guide groove has an inner diameter surface with a rounded end. The method according to claim 1,
Wherein the guide groove is a wedge-shaped groove having a relatively narrow width from the entrance to the middle and a relatively wide width at the end. The method according to claim 1,
The wing bit has axle protrusions formed on both sides thereof, a first excavation surface formed on a lower surface thereof, a third excavation surface inclined to a portion of the front surface, a third excavation surface inclined to a part of the front surface, The excavation bit. The method according to claim 1,
Wherein the shaft projection is formed integrally with the wing bit and has a cross section of at least a circular shaft projection, a ring-shaped shaft projection, a split circular shaft projection which is equally divided into a plurality of pieces, a split ring shaft projection which is equally divided into a plurality of pieces, An elliptical axial projection, a partially flat circular circular axial projection, and a combination thereof. The method according to claim 1,
The stopper member
A stopper body as a whole which is a ring type in which a threaded portion of the bit body passes; And
A stopper arm formed on one surface of the stopper body and inserted into a stopper receiving groove formed at a guide groove entrance of the bit body;
. 10. The method of claim 9,
The stopper member
An axial protrusion support finger formed on the stopper arm and having a concave support groove to be in contact with a part of the axial protrusion;
Further comprising an excavation bit. The method according to claim 1,
A guide device formed on the bit body and screwed to a threaded portion of the bit body passing through the stopper member and fixing the stopper member to the bit body;
Further comprising an excavation bit.

Images