KR102055482B1 - Bit for excavating - Google Patents

Abstract

The present invention minimizes the noise generated during the excavation work, and provides a structure that can combine and separate the ring bit on the center bit and the outer peripheral surface of the center bit, so that the work can be easily exchanged even if the ring bit is damaged. A bit for an excavation device. The drill bit is a discharge passage 130 which is formed to be inclined upward at a predetermined angle while passing through the interior from the outlet of the bottom discharge groove 120 formed in a predetermined length from the center of the bottom toward the outer surface upper portion and A center bit 100 having a coupling part 160 formed at a lower outer circumference thereof, and a ring shape to be screwed to the coupling part 160, and an inner circumference at the center bit 100 when combined with the center bit 100. It consists of a ring bit 200, the support jaw 220 is formed so that a portion of the bottom of the contact.

Description

Bit for excavating

The present invention relates to an excavation device, and more particularly, to form a discharge groove for slime discharge in the excavation device bit, so that the excavation work can be safely performed while minimizing the wear of the bit and noise generated during excavation work It relates to a bit for the drilling device is configured.

Excavator has a configuration including an air hammer to reciprocate in the vertical reciprocating motion by the force of the compressed air, and a bit attached to the lower portion of the air hammer to substantially strike the ground and to excavate. And by the air hammer and the bit is formed a hole of a constant diameter underground, it is possible to proceed to the excavation work of the desired size and depth.

1 and 2 show the configuration of such a conventional drilling rig. The air hammer (not shown) which receives compressed air from the outside as shown in the figure and reciprocates in the vertical direction by the force and strikes the ground, and the ground is substantially linked with the vertical movement of the air hammer. It includes a bit 10 mounted to the lower portion of the air hammer so as to strike. The bottom of the bit 10 is provided with a plurality of button tips, it can be said that the excavation proceeds like the earth and sand breaks by this button tip.

In addition, an air supply passage 14 is formed inside the bit 10. The air supply passage 14 is connected to the inlet 12 for receiving air from the air hammer and is configured to face the bottom of the bit 10. In addition, a plurality of discharge grooves 16 are formed on the outer circumferential surface of the bit 10 in the up and down direction, and the bottom surface of the bit 10 connects the outlet of the air supply passage 14 and the discharge groove 16 to each other. The bottom discharge groove 15 is formed. Therefore, the slime generated at the bottom by the air supplied to the air supply passage 14 is discharged to the discharge groove 16 through the bottom discharge groove 15.

However, the conventional drilling rig having such a configuration has the following problems. First, in the conventional drilling rig, the discharge groove 16 in an open state is formed on the outer circumferential surface of the bit 10. Thus, the high pressure air supplied through the air supply passage 14 is guided through the bottom discharge groove 15 and directly sprayed toward the ground parallel to the bit 10 in the vertical direction (arrow in FIG. 2), This causes ground disturbances due to air pressure. This ground disturbance phenomenon substantially lowers the safety of the ground.

In the conventional drilling rig, the noise generated when the high pressure air strikes the ground is relatively large. Although the noise is generated by various causes when excavation work using the excavation device, it is true that the noise generated when the air hits the ground directly or indirect damage to the operator and the surrounding environment. The damage caused by these noises will continue to be necessary during the excavation, so improvements will be absolutely necessary.

In addition, the conventional drilling rig was not smooth discharge of the slime because the discharge groove 16 is formed on the outer peripheral surface. That is, since the air injected through the air supply passage 14 is returned to the ground and back again, there was a problem that the slime was not easily discharged to the outside due to the eddy current caused by the collision with the newly injected air.

In addition, due to the discharge groove 16 formed in the bit 10, it is not possible to form a button tip in a portion 'A' of the bottom outer surface of the bit 10. This problem leads to a problem that damage easily occurs at the edge portion of the bit 10. That is, the main part (that is, the part where wear occurs at the maximum) that strikes the ground directly when working with the excavator is the bottom outer surface of the bit 10. If the button tip 20 is not formed in the part, the bit ( Since 1) has no choice but to hit the ground directly, damage occurs due to direct transmission of shocks.

These various problems are pointed out as factors that substantially reduce the performance of the excavation work.

Accordingly, an object of the present invention is to form a discharge groove for discharging the slime inside the bit by receiving the air, so that ground disturbances caused by the high-pressure air supply is suppressed to maintain excavation work while maintaining the safety of the ground It is to provide a bit for the excavation device is configured.

And another object of the present invention is to remove the noise generated when the high-pressure air hits the ground directly.

In addition, the present invention can be said to improve the work efficiency while reducing the damage of the bit by relatively minimizing the degree of wear of the portion where the maximum wear occurs during the excavation work.

An object of the present invention as described above, the bottom discharge groove formed in the outer direction from the bottom center, the discharge passage formed inclined upward while passing through the interior from the outlet of the bottom discharge groove toward the upper side, the lower outer peripheral portion is recessed stepped A first bit having a coupling portion formed therein; And a second bit formed in a ring shape to engage with the coupling part, and an inner circumference including a second bit in which a supporting jaw is formed to contact a portion of the bottom surface of the first bit when the first bit is engaged with the first bit. When the and the second bit is combined, the support jaw of the second bit and the bottom of the first bit contact each other, and the upper surface of the second bit and the step contact the first bit. To provide a bit for an excavation device, characterized in that the holding.

The second bit is coupled to protrude from the bottom of the first bit, and a plurality of button tips are formed on the bottom.

According to the present invention as described above, the discharge groove is formed to be inclined upward at a predetermined angle so as to discharge the slime moving through the bottom discharge groove to the outside inside the bit. Therefore, since high-pressure air supplied for the movement of the slime is prevented from being injected directly toward the ground, excavation work can be made safe while suppressing ground disturbance. And since the air is injected through the upward inclined discharge groove there is an effect that can minimize the noise generated when the air hits the ground.

In addition, in the present invention, the bottom of the bottom surface of the bit, that is, the button tip can be formed to the maximum on the part where abrasion occurs in the excavation work to the maximum, there is an effect that can minimize the damage of the bit.

And the present invention forms a protrusion on the bottom edge of the bit. Since the protrusion has the effect that the center bit is supported on the rock during the excavation work, the bit can be minimized from the rock due to the vibration or shock generated during the excavation work, and thus the workability can be expected to be improved. .

1 and 2 are side and bottom views of a bit according to the prior art.
Figure 3 is a cross-sectional view showing a bit for an excavation device according to a preferred embodiment of the present invention
4 is a bottom view of FIG. 3
5 is a cross-sectional view showing a modified example of the drilling device bit of FIG.
6 is a cross-sectional view of the drilling device bit according to another embodiment of the present invention
FIG. 7 is a cross-sectional view of a second bit mounted to the first bit of FIG. 6. FIG.
8 is a cross sectional view of a combination of the first bit and the second bit;
9 is a bottom view of FIG. 8

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the excavation device according to the present invention will be described in detail.

3 is a cross-sectional view of an excavation device according to an embodiment of the present invention, Figure 4 is a bottom view of the excavation device. As shown therein, the drilling device includes a bit 100 coupled to the lower portion of the air hammer (not shown) that rotates in one direction by a motor to perform actual drilling.

Looking at the structure of the bit 100, the inlet 101 is formed in the inner center to receive the high-pressure compressed air. Inlet 101 refers to a portion where the air supplied from the outside is supplied through the air hammer.

A plurality of air supply passages 110 connected to the inlet 101 and facing the bottom of the bit 100 are provided. Air supply passage 110 has an outlet is formed in the center portion relatively to the edge of the bottom of the bit 100. Therefore, when the excavation proceeds, the slime generated between the bottom of the bit 100 and the ground is pushed out by the air supplied through the air supply passage 110.

The air supply passage 110 is connected to the bottom discharge groove 120 formed outward from the center of the bottom of the center bit 100. The bottom discharge groove 120 serves to substantially push the slime from the bottom center outward by the air supplied through the air supply passage 110.

And the bottom discharge groove 120 is connected to the upward discharge groove 130 to discharge the slime to the outside. The upward discharge groove 130 is formed inside the center bit 100, and in particular, is formed to be inclined upward at a predetermined angle toward the upper side of the outer surface of the center bit 100 at the outlet of the bottom discharge groove 120. That is, the inlet of the upward discharge groove 130 is connected to the bottom discharge groove 120 and the outlet is formed to face the upper side of the outer side of the bit 100. When the upward discharge groove 130 is formed in the bit 100 as described above, high pressure air is prevented from being directly injected toward the ground, and the button tip is maximized while fully utilizing the bottom portion of the bit 100. It becomes possible. This will substantially reduce the wear of the part due to improved ground safety during excavation, minimization of noise generated when high pressure air strikes the ground directly, and the formation of button tips.

On the other hand, the outlet of the upward discharge groove 130 is connected to the discharge passage (not shown) for discharging the slime to the ground between the air hammer and the cylindrical casing provided on the outer surface of the air hammer. Therefore, the outlet of the air supply passage 110 is formed in the center portion of the bottom discharge groove 120 to blow air, so the slime generated from the bottom of the center bit 100 is the bottom discharge groove according to the direction of the air injection It can be discharged through the 120 and the upward discharge groove 130. That is, the arrow of FIG. 3 has shown the flow direction of air.

Next will be described the overall operation of the drilling rig having a bit configured as described above. When the excavator is operated, the air hammer rotates in one direction by the force of the motor installed in the upper portion. And the movement of the air hammer is transmitted to the bit 100, so that the bit 100 is excavating the ground while hitting the ground.

When such ground excavation is performed, slime is generated on the bottom of the bit 100. In addition, if the slime remains under the bit 100, since the excavation work is not performed, it must be effectively discharged to the outside. High pressure air is supplied for this purpose.

The air is supplied to the inlet 101 and the plurality of air supply passages 110 connected to the inlet 101. Then, the air is again supplied to the bottom discharge groove 120 connected to the air supply passage 110. When air is supplied to the bottom discharge groove 120, the air is disposed between the bottom and the ground of the bit 100 by the air. Slime that is generated from is pushed to the side of the center bit (100). The slime pushed to the side of the center bit 100 moves toward the upward discharge groove 130 connected to the bottom discharge groove 120 according to the flow direction of the air, and the slime discharged from the upward discharge groove 130 is casing. It is discharged to the ground through the discharge passage formed between the air hammer.

Here, the upward discharge groove 130 is formed to be inclined upward at a predetermined angle toward the top of the outer surface from the bottom of the bit 100 as shown. Thus, the compressed high pressure air supplied to the air supply passage 110 is injected toward the upper portion of the bit 100 when discharged through the bottom discharge groove 120 and the upward discharge groove 130. It can be seen that the configuration is such that air is not injected directly toward the side wall of the bit 100. Therefore, it is possible to prevent ground disturbances caused by the pressure of the compressed air by suppressing the air hitting the ground directly. For this reason, the angle of the upward discharge groove 130 may be properly formed within the range that the ground is not collapsed by the discharged air and the slime can be smoothly discharged.

And since air is not directly hitting the ground as described above, it is possible to minimize the noise generated when the conventional compressed high-pressure air hits the ground. This is compared with the air discharged directly toward the ground perpendicular to the bottom discharge groove 120 in the prior art, because the air is discharged through the upward discharge groove 130 formed to be inclined upwards, the noise when directly hitting the ground It is natural that this shrinks.

On the other hand, the bottom of the bit 100 is provided with a button tip 140. That is, the button tip 140 is formed in an area except the area in which the bottom discharge groove 120 is formed. Here, it can be seen that the button tip 140 is also formed at the bottom edge of the bit 100. This part is the part where the wear of the bit 100 occurs the most during the excavation work. As such, a large number of button tips 140 may be formed in an area in which wear is large, and thus, the bit 100 may be minimized because the bit 100 does not have to hit the ground directly during the excavation work. Will be.

5 is a cross-sectional view showing a modified example of the drilling device bit of FIG. Since the bits shown in FIG. 5 are the same except for the bottom edge portion of the center bits as compared to the center bits of FIG. 3, the same components as in FIG. 3 will be described with the same reference numerals.

A variant of the drill bit 100 is shown in more detail in FIG. 5. Referring to FIG. 5, the inlet 101 receives a compressed high-pressure air at the center of the bit 100, and the air inlet 101 has a plurality of air supply passages 110 facing the bottom of the bit 100. Connected. In addition, the air supply passage 110 is connected to the bottom discharge groove 120 formed on the bottom of the bit 100, the bottom discharge groove 120 is connected to the upward discharge groove 130 again. And the upward discharge groove 130 is formed inclined at a predetermined angle toward the upper side of the outer surface from the bottom of the bit 100, similar to the bit shown in FIG.

Therefore, the air supplied to the inlet 101 is injected into the bottom discharge groove 120 through the air supply passage 110, the air is discharged upward from the bottom discharge groove 120 in the slime generated during the excavation work 120 Will be discharged to ground.

A protrusion 150 is formed at the bottom edge of the bit 100. The protrusion 150 is formed to protrude from the bottom edge portion of the bit 100. In this case, the bottom portion of the bit 100 is formed in a relatively concave shape. As shown in the drawing, the protrusion 150 is formed at the edge of the bit 100 in a range where interference with the bottom discharge groove 120 does not occur.

The protrusion 150 may serve to support the bit 100 by digging some of the ground during the excavation work. Accordingly, when the excavation work is carried out, the position of the bit 100 may be fixed so that the excavation work may be accurately performed. That is, when the drilling operation is substantially progressed, vibration or impact of considerable intensity occurs in the bit 100. And such vibrations or shocks may make the bit 100 not excavable while maintaining a predetermined working position. For example, when a part of the excavation work paper is inclined at a predetermined angle, the bit 100 may be pushed downward by vibration or shock applied to the bit 100. However, when the protrusions 150 support the bit 100 as described above, the excavation work can be performed smoothly without being pushed even on a slope.

In addition, the protrusion 150 of the bit 100 may be provided with a button tip. Then, the button tip provided on the protruding portion 150 hits the rock while supporting the bit 100 while hitting the rock, so that the sliding phenomenon caused by the rock can be minimized and a more stable excavation can be performed.

Next, a bit structure for an excavation device according to another embodiment of the present invention will be described with reference to FIGS. 6 to 9. In describing the bits shown here, the same components as those described with reference to FIGS. 3 and 5 are denoted by the same reference numerals, and detailed descriptions thereof may be omitted. However, since the bit is used together with a bit of another structure, the bit is described as a first bit (ie, a center bit), and a bit coupled to the outer peripheral surface of the center bit is referred to as a second bit (ie, a ring bit). Do it.

6 is a cross-sectional view of a bit according to another embodiment of the present invention. As shown, the inlet 101 receives the compressed high-pressure air at the center of the first bit 100. In addition, the inlet 101 is connected to a plurality of air supply passages 110 facing the bottom of the first bit 100. The bottom discharge groove 120 formed on the bottom of the first bit 100 is connected to the air supply passage 110, and the bottom discharge groove 120 is connected to the upward discharge groove 130 again.

The upward discharge groove 130 is formed to have a predetermined slope toward the upper side of the outer surface in the interior of the first bit 100 as shown. The upward discharge groove 130 formed as described above prevents air from being directly injected to the ground, thereby preventing ground disturbances and also minimizing noise generated by directly hitting the ground. same.

A coupling unit 160 is formed at a lower outer circumference of the first bit 100 so that the second bit (see FIG. 7) can be coupled thereto. An example of such a coupling part 160 provides a screw coupling method, and the coupling part 160 is provided with a screw 162. The screw 162 may be a female thread or a male thread.

A second bit 200 screwed to the coupling portion 160 is shown in FIG. 7. The second bit 200 is formed in a ring shape that can be screwed into the outer periphery of the first bit 100, and the coupling portion 160 is formed on the inner periphery of the second bit 200 for screwing. The male screw and the female screw corresponding to the screw are formed. The male screw or the female screw is indicated by the reference numeral 210. Therefore, when the second bit 200 is inserted into the first bit 100 and rotated in one direction, the first bit 100 and the second bit 200 are coupled to each other, and when turned in the opposite direction to the rotation direction, they are separated again. do.

The support jaw 220 is formed at an inner circumference of the second bit 200. A cross section of the support jaw 220 is a portion where the bottom surface of the first bit 100 contacts. That is, when the second bit 200 is inserted into the first bit 100 and completely rotated, the support jaw 220 of the second bit 200 is in contact with the bottom of the first bit 100. Will be.

The button tip 230 is formed on the bottom of the second bit 200 having the above configuration.

Meanwhile, the coupling state of the first bit and the second bit can be confirmed through FIGS. 8 and 9. In this case, the second bit 200 is coupled to the coupling part 160 provided on the outer circumference of the first bit 100 by a screw coupling method, and the second bit 200 is coupled to the support jaw 220 of the second bit 200 according to the coupling. Since the bottom surface of the first bit 100 is seated, the second bit 200 protrudes more substantially than the first bit 100. This shape may be similar to the shape in which the protrusion 150 is formed at the bottom edge of the center bit 100 described above.

As such, the first bit 100 and the second bit 200 may be combined and separated from each other according to the configuration of the coupling unit 160. Therefore, in the case of excavation work, when the second bit 200 is damaged or wear occurs on the button tip of the second bit 200, the excavation is difficult, and thus the second bit 200 may be easily replaced. That is, as shown in FIGS. 8 and 9, the button tips 140 and 230 are formed on both bottom surfaces of the first bit 100 and the second bit 200, and in particular, the second bit 200 protrudes. Since the button tip 230 of the second bit 200 directly strikes the ground during the excavation work, wear may occur relatively easily. In this case, it is possible to solve a problem caused by damage to the second bit 200 or wear of the button tip 230 only by replacing the second bit 200.

Although described with reference to the illustrated embodiment of the present invention as described above, this is merely exemplary, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the invention It will be apparent that other variations, modifications and equivalents are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

100: center bit 101: entrance
110: air supply passage 120: bottom discharge groove
130: upward discharge groove 140: button tip for the center bit
150: protrusion 160: coupling portion
200: ring bit (second bit) 220: support jaw
230: Button tip for the ring bit

Claims (2)

Air is supplied from the air supply passage 110 and the bottom discharge groove 120 formed in the outward direction from the center of the bottom of the bit, through the inside of the bit from the outlet of the bottom discharge groove 120 toward the top of the outer surface to the outside A first bit 100 having a discharge passage 130 formed to be inclined upwardly and having a coupling portion 160 formed with a stepped portion 161 by recessing a portion of a lower outer circumference thereof; And
Is formed in a ring shape to be coupled to the coupling portion 160, the inner periphery when the support jaw 220 is formed so that a portion of the bottom surface of the first bit 100 in contact with the first bit 100 Two bits 200;
When the first bit 100 and the second bit 200 are combined, the support jaw 220 of the second bit 200 and the bottom surface of the first bit 100 come into contact with each other and the upper surface of the second bit 200. The step 161 is in contact with each other, so that the first bit 100 and the second bit 200 remain in the first coupled state during the excavation operation;
The second bit 200 is coupled to the protruding state than the bottom of the first bit 100, a plurality of button tips 230 is formed on the bottom bit for the excavator.






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