KR20200002380U - Drill bit for underground excavation - Google Patents

Abstract

The present invention relates to a drill bit for ground excavation with improved wear resistance of the head portion, and a body portion mounted on the bit mounting hole while forming a supply flow path through which fluid is supplied therein, and a body portion located at the front portion of the body portion and coupling buttons In the drill bit comprising a head portion, the head portion includes: a face surface of a front surface facing an excavation direction, an inclined surface formed with a certain inclination outward along an edge of the face surface, an outer peripheral surface of a side surface formed along the edge of the inclined surface, A first discharge port formed on the face surface while communicating with the supply flow path to discharge the fluid in a front direction, a second discharge port formed on the outer peripheral surface while communicating with the supply flow channel to discharge the fluid in a lateral direction, and the face surface It includes a face button coupled to, a gauge button coupled to the inclined surface, and a reinforcing tip coupled to the outer peripheral surface.

Description

Drill bit for underground excavation with improved wear resistance

The present invention relates to a drill bit for ground excavation with improved wear resistance of the head portion.

The drill bit of the hammer for ground excavation is mounted in the hammer body so as to receive driving force and pneumatic pressure from the ground excavator, and performs a function of excavating the soil or rock layer while repeating rotation and hitting during excavation work.

In general, a hammer for ground excavation includes a hammer body having a striking space and a bit mounting hole, a pneumatic piston, a striking device that is installed to be elevating and descending by air, installed in the striking space, and mounted to the bit mounting hole, and by the pneumatic piston. It includes a drill bit that advances and strikes the ground.

Looking at the operation of the ground excavation hammer, the hammer body rotates by the rotational force transmitted from the rotary head of the ground excavator through the joint at the top, and at the same time, it is transmitted from the air compressor of the ground excavator. The pneumatic piston is driven by the high-pressure air to perform the drilling operation by hitting the drill bit. Therefore, the drill bit used for ground excavation is very abrasion due to the impact received during work.

1 is a perspective view showing a drill bit for ground excavation according to the prior art.

As shown, the drill bit includes a body portion 11 mountable to the bit mounting hole, and a head portion 12 positioned in front of the body portion 11 and to which the buttons 16 are coupled. A face surface 13 is provided at the front end of the head 11, and a plurality of buttons 16 are combined while being arranged in a predetermined distribution pattern. A fluid discharge port 15 for discharging a fluid is formed on the face surface 13 to discharge slime generated during excavation to the ground. In addition, an inclined surface 14 having a predetermined inclination is formed at the edge of the face surface 13, and a plurality of buttons 17 are also coupled to the inclined surface.

The drill bit of the above configuration excavates the ground while colliding with the face surface 13 and the inclined surface 14 in the hitting direction by the hit applied from the hammer. . The buttons 16 and 17 constituting the drill bit are made of a material having a stronger durability than the head 12 because they directly impact soil or rock.

At this time, the buttons 16 coupled to the face surface 13 mainly perform a function of excavating the ground in the vertical lower part by transmitting an impact to the soil or rock in a vertical direction, and the button 17 coupled to the inclined surface 14 ) Perform the function of excavating the ground on the side by transmitting the impact in the inclined direction. In this way, although each button (16, 17) is different in the direction in which the impact is transmitted, the conventional drill bit has the same shape of the bits (16, 17) formed on the face surface 13 and the inclined surface 14. Therefore, there is a problem that the impact cannot be transmitted efficiently.

In addition, the drill bit discharges the slime generated in the excavation process to the ground along the outside of the head 12 and the body 11 by injecting a fluid with a strong pressure through the fluid discharge port 15 at the same time as the ground excavation. . To this end, the conventional drill bit has a fluid discharge port 15 formed on the face surface 13 of the head 12.

However, the conventional drill bit has a problem in that the fluid discharge port 15 is formed only on the face surface 13, which is the front face of the head 12, so that the slime cannot be efficiently discharged. That is, the slime existing around the face surface 13 is easily discharged by the fluid ejected along the fluid discharge port 15 of the face surface 13, but the inclined surface 14 of the head 12 or In the side surface 18, since the fluid is reflected on the ground and then flows to the side, the pressure is relatively weak, and the slime on the inclined surface 14 or the side surface 18 cannot be easily discharged.

As such, the slime that cannot be discharged from the side area adheres to the surface of the head part 12, and a piece of rock among the slime collides with the head part 12, and as shown in FIG. 2, the head part 12 is easily worn. Will be ordered. Further, as the head portion 12 is slightly worn by the rock pieces, the buttons 16 and 17 attached to the face surface 13 or the inclined surface 14 are separated from the head portion 12, and the detached buttons (16, 17) again collides with the head portion 12 and other buttons 16, 17 in a cascade, so that the wear of the head portion 12 is further accelerated.

International Publication No. WO 2016/131653

The present invention has been proposed to solve the above problems, and an object thereof is to provide a drill bit capable of improving excavation efficiency by varying the shape of the button according to the position of the head.

In addition, the present invention aims to provide a drill bit capable of quickly discharging the slime generated in the excavation process, but also rapidly discharging the slime on the side of the head, thereby preventing abrasion of the head part by the remaining slime.

Another object of the present invention is to provide a drill bit capable of improving wear resistance by bonding a reinforcing material to a head portion made of a material having relatively weak durability compared to a button.

The present invention for achieving the above object is a drill bit consisting of a body portion mounted on a bit mounting hole while forming a supply flow path through which fluid is supplied, and a head portion positioned in front of the body portion and coupling buttons. In the above, the head portion is in communication with the face surface of the front facing the excavation direction, an inclined surface formed with a certain inclination outward along the edge of the face surface, an outer circumferential surface of a side surface formed along the edge of the inclined surface, and the supply passage A first discharge port formed on the face surface to discharge the fluid in a front direction, a second discharge port formed on the outer circumferential surface while communicating with the supply flow path to discharge the fluid in a lateral direction, a face button coupled to the face surface, And a gauge button coupled to the inclined surface, and a reinforcing tip coupled to the outer peripheral surface.

Here, the face button and the gauge button may have different radiuses of curvature, but the gauge button may have a relatively larger radius of curvature.

In addition, the face button may form a cone shape with a round tip, and the gauge button may form a hemispherical shape.

In addition, the reinforcing tip has a protruding height not exceeding 3 mm with respect to the surface of the outer peripheral surface.

In addition, the face surface includes a first surface facing the ground in the excavation direction, and a second surface formed in a ring shape along the outside of the first surface and having a slope smaller than the inclined surface.

The present invention is configured to vary the shape of the button, that is, the radius of curvature, which is coupled according to the position of the head portion facing the front or the side of the excavation direction, thereby improving excavation efficiency.

In addition, the present invention is configured to vary the radius of curvature of the button coupled according to the position of the head portion facing the front or side in the excavation direction, there is an effect that the button is not easily separated from the head portion.

In addition, according to the present invention, a fluid discharge port is formed in both the front and side surfaces of the excavation direction, so that the slime in the front and side directions is rapidly discharged, thereby reducing wear of the head portion due to the impact of the slime.

In addition, according to the present invention, since the reinforcing tip is coupled to the side of the head, the wear resistance of the drill bit can be improved by reducing damage to the head due to the impact of the slime or the button separated from the head.

1 is a perspective view showing a drill bit for ground excavation according to the prior art,
Figure 2 is a view showing the wear state of the drill bit for drilling in the ground according to the prior art,
Figure 3 is a perspective view showing a drill bit for drilling the ground according to this embodiment,
4 is a front view showing the face surface of the drill bit of FIG. 3;
5 is a first cross-sectional view showing the drill bit of FIG. 3;
6 is a second cross-sectional view showing the drill bit of FIG. 3;
7 is an enlarged view showing a button that is a main part of FIG. 3.

The present invention and the technical problem achieved by the implementation of the present invention will be clarified by the preferred embodiments described below. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

It should be understood that the differences between the present embodiments described below are not mutually exclusive. That is, without departing from the spirit and scope of the present invention, specific shapes, structures, and characteristics described may be implemented in other embodiments in relation to one embodiment, and of individual components within each disclosed embodiment. It should be understood that the position or arrangement may be changed, and similar reference numerals in the drawings refer to the same or similar functions over various aspects, and the length, area, thickness, and the like may be exaggerated for convenience. In the description of the present embodiment, expressions such as first, second, inside, outside, before, after, etc. represent a relative order, position, direction, and the like, and their technical meaning is not necessarily limited to the dictionary meaning.

3 is a perspective view showing a drill bit for ground excavation according to the present embodiment, FIG. 4 is a front view showing a face surface of the drill bit of FIG. 3, and FIG. 5 is a first cross-sectional view in the II direction showing the drill bit of FIG. 3 6 is a second cross-sectional view showing the drill bit of FIG. 3 in the Ⅱ-Ⅱ direction, and FIG. 7 is an enlarged view showing a button which is a main part of FIG. 3.

Referring to these drawings, the drill bit of the present embodiment includes a body part 100 mounted on a bit mounting hole (not shown), and a head part located in front of the body part 100 and coupling the buttons 220 and 240 It includes 200 and a plurality of buttons 220 and 240 coupled to the head portion 200.

Specifically, the body portion 100 is configured to be coupled to a bit mounting hole constituting a hammer, and may form a circular shape having a predetermined length. The body portion 100 is formed in a concave-convex structure along the outer circumferential surface of the coupling protrusions 110 for coupling with the bit mounting hole. In addition, the body portion 100 forms a supply passage 130 through which a fluid is supplied in the center, and the supply passage is connected to the fluid outlets 211 and 251 of the head portion 200.

The head part 200 is configured to excavate by impacting the ground by hitting and rotating the hammer body (not shown), and is formed to extend to a diameter larger than that of the body part 100 at the front end of the body part 100. The head part 200 may be integrally formed of the same material as the body part 100.

The head portion 200 has a face surface 210 and an inclined surface 230 with respect to the hitting direction of the front surface, and has an outer peripheral surface 250 with respect to the rotational direction of the side surface. That is, the inclined surface 230 forming a predetermined inclination is continuously positioned at the edge of the face surface 210, and the outer peripheral surface 250 is positioned while continuing from the inclined surface 230 to the side portion.

A plurality of face buttons 220 are coupled to the face surface 210, and a plurality of gauge buttons 240 are coupled to the inclined surface 230. The face surface 210 excavates the ground at the front by transmitting hits and rotations in the excavation direction perpendicular to the ground, and the inclined surface 230 transmits hits and rotations in the excavation direction forming an inclination with the ground to excavate the ground at the side. do.

The head part 200 has fluid discharge ports 211 and 251 for discharging fluid to discharge the slime generated during the excavation process. In this embodiment, the first discharge port 211 formed on the face surface 210 and the outer circumferential surface It includes a second discharge port 251 formed in (250). The first discharge port 211 discharges the slime generated from the front side in the excavation direction, and the second discharge port 251 discharges the slime generated from the side of the excavation direction. The first discharge port 211 and the second discharge port 251 may be formed in a plurality with a predetermined interval with respect to the circular face surface 210 or the outer circumferential surface 250, and are radially symmetrical with respect to the central axis and at regular intervals. It is preferably formed of. A first discharge passage 211a and a second discharge passage 251a are formed in the first discharge port 211 and the second discharge port 251 to be concave along the surface of the head part 200.

The second discharge port 251 directly discharges the slime in the side area while discharging the fluid from the outer circumferential surface 250 of the head part 200 to the side, so that it can be discharged with a strong pressure. The fluid discharged from the second discharge port 251 prevents the slime from sticking to the inclined surface 230 and the outer circumferential surface 250 of the head part 200, and the rock pieces are the outer circumferential surface 250, the inclined surface 230, and the gauge button ( 240).

Therefore, since the drill bit of this embodiment simultaneously discharges a fluid with a strong pressure in the front and side directions in the excavation direction, the slime generated in the front and side areas of the head 200 is simultaneously discharged with a strong pressure. Damage of the part 200 and separation of the buttons 220 and 240 may be minimized.

Meanwhile, in the drill bit of this embodiment, the face surface 210 is the first surface 210-1, the second surface 210-2 and the first surface 210-1 outside the first surface 210-1 It may include an inner third surface 210-3.

The first surface 210-1 is formed in a direction perpendicular to the excavation direction, that is, a surface parallel to the ground. Here, the meaning of a vertical or parallel direction includes not only an absolute 90° or 0°, but also a range that can be regarded as being generally close to or parallel to the vertical. A plurality of first face buttons 220-1 may be coupled to the first surface 210-1 in a predetermined or random pattern. A third surface 210-3 is formed inside the first surface 210-1, and the first surface 210-1 forms a ring-shaped face surface 210.

The second surface 210-2 is formed in a ring shape along the outside of the first surface 210-1. The second surface 210-2 forms a smaller inclination than the inclined surface 230 and connects the first surface 210-1 and the inclined surface 230 to prevent a change in inclination between the face surface 210 and the inclined surface 230. Buffer. A plurality of second face buttons 220-2 may be coupled to the second surface 210-2 in a predetermined or random pattern.

The third surface 210-3 is formed in the inner region of the first surface 210-1 and is formed in a concave groove shape having a fine curvature. The concave third surface 210-3 allows the fluid discharged from the first discharge port 211 on one side to be discharged across the circular face surface to the other side. At least one or more third face buttons 220-3 may be coupled to the third surface 210-3 in a predetermined or random pattern.

The buttons 220 and 240 are configured to cause excavation by impacting the ground by hitting and rotating the hammer body, and the face button 220 coupled to the face surface 210 and the gauge button coupled to the inclined surface 230 Includes 240. The buttons 220 and 240 are made of a material having a higher rigidity than that of the head part 200, and for example, may be made of a cemented carbide material.

In the drill bit of the present embodiment, the face button 220 and the gauge button 240 form different shapes.

The face button 220 excavates by applying an impact in the same vertical direction as the protruding direction to the ground when the face surface 210 is referenced, so that a relatively small radius of curvature R1 compared to the gauge button 240 is advantageous for excavation. ) Is composed of a protruding button of a pointed shape with the end (Fig. 7 (a)). When hitting for excavation, a vertical component force in the opposite direction acts on the face button 220, and this reaction force pushes the face button 220 from the front ('F1' in Figs. 5 and 6), so the face button 220 is not easily separated from the face surface 210. For example, the face button 220 may be composed of a conical protrusion having a rounded tip.

On the other hand, the gauge button 240 excavates by applying an impact in an inclined direction to the ground with respect to the protruding direction when the inclined surface 230 is referenced, so that the force by the reaction is also applied in the inclined direction. Since the reaction force in the inclined direction pushes the gauge button 240 from the side ('F2' in FIGS. 5 and 6), the gauge button 240 is easily separated from the inclined surface 230. Accordingly, the gauge button 240 forms a gentle protruding structure having a relatively large radius of curvature R2 so as to distribute and buffer the force of the reaction applied in the inclined direction (FIG. 7(b)). For example, the gauge button 240 may be composed of a hemispherical protrusion.

In addition, the face button 220 is also between the first face button 220-1 and the second face button 220-2 formed on the first surface 210-1 and the second surface 210-2. It can be formed with protrusions of different shapes. That is, since the second face 210-2 has a slope unlike the first face 210-1, the second face button 220-2 is relatively It has a large radius of curvature and can form a structure that protrudes gently. At this time, the second face button 220-1 should have a relatively smaller radius of curvature than the gauge button 240 and have a sharply protruding structure.

In addition, in the drill bit of this embodiment, a reinforcing tip 260 for reinforcing the mechanical rigidity of the head portion 200 is coupled to the outer peripheral surface 250 of the head portion 200. The reinforcing tip 260 is made of a material having greater rigidity than the head part 200, and for example, may be made of a cemented carbide material. During excavation, the crushed rock pieces impact the outer circumferential surface 250 of the head part 200 in the process of being discharged at high speed, and the outer circumferential surface 250, which is relatively weak compared to the buttons 220 and 240, is It can be easily worn (see Figure 2). The reinforcing tip 260 minimizes abrasion of the outer circumferential surface 250 from the impact of rock fragments generated in the excavation process or the buttons separated from the head part 200, thereby improving the wear resistance of the head part 200.

The reinforcing tip 260 may be formed at a random position with respect to the outer circumferential surface 250, protrudes from the surface of the outer circumferential surface 250 in a smooth curved shape with a maximum height (h) of 3 mm or less, and sufficient inside the outer circumferential surface 250 Combined by depth. When the reinforcing tip 260 protrudes from the surface of the outer circumferential surface 250 to a height of more than 3mm, the reinforcing tip 260 directly collides with a piece of rock and may be separated from the outer circumferential surface 250.

As described above, an exemplary embodiment of the present invention has been shown and described, but various modifications and other embodiments may be made by those skilled in the art. These modifications and other embodiments are all considered and included in the appended claims and will not depart from the true spirit and scope of the present invention.

100: head
110: coupling protrusion 120: fluid supply flow path
200: head
210, 210-1, 210-2, 210-3: face surface
220, 220-1, 220-2, 220-3: Face button
230: slope 240: gauge button
250: outer circumferential surface 260: reinforcement tip
211, 251: fluid discharge port

Claims (5)

In a drill bit comprising a body portion mounted on the bit mounting hole while forming a supply passage through which fluid is supplied, and a head portion positioned in front of the body portion and coupling buttons, the head portion,
A face surface of the front facing the excavation direction;
An inclined surface formed while forming a predetermined inclination outward along the edge of the face surface;
An outer peripheral surface of a side surface formed along the edge of the inclined surface;
A first discharge port formed on the face surface while communicating with the supply flow path to discharge the fluid in a front direction;
A second discharge port formed on the outer circumferential surface while communicating with the supply flow path to discharge the fluid in a lateral direction;
A face button coupled to the face surface;
A gauge button coupled to the inclined surface; And,
Reinforcing tip coupled to the outer circumferential surface; Containing, ground drilling drill bit. The method of claim 1,
The face button and the gauge button have different radiuses of curvature, wherein the gauge button has a relatively larger radius of curvature. The method of claim 2,
The face button has a conical shape with a round tip,
The gauge button forms a hemispherical shape, a drill bit for ground excavation. The method of claim 1, wherein the reinforcing tip,
A drill bit for ground excavation whose protruding height does not exceed 3mm with respect to the surface of the outer peripheral surface. The method of claim 1, wherein the face surface,
A drill bit for ground excavation comprising a first surface facing the ground in the excavation direction, and a second surface formed in a ring shape along the outer side of the first surface and having a slope smaller than the inclined surface.

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