KR102201149B1 - Reverse Circulation Air Hammer Bit - Google Patents

Abstract

The present invention relates to a bit mounted on a lower part of a DTH hammer of a reverse circulation air hammer excavation device. The bit comprises: a bit body part (110) having a hammer mounting groove (115) mounted on the lower part of the DTH hammer; a bit head part (120) extending from the lower part of the bit body part (110) to have a relatively larger diameter than the bit body part (110), being integral with the bit body part (110); a working water supply groove part (130) vertically formed along the outer circumferential surface of the bit head part (120) to serve as a descending passage for working water supplied from the ground; an air supply line (140) formed along the central axes of the bit body part (110) and the bit head part (120) to serve as a supply passage for compressed air; and an excavated rock piece discharge line (150) connecting upper and lower surfaces of the bit head part (120) and serving as an ascending passage for work rock piece including working water. The excavated rock piece discharge line (150) has a structure in which the cross-sectional area thereof increases from a lower part to an upper part of the bit head part (120).

Description

Reverse Circulation Air Hammer Bit

The present invention relates to a bit used in a reverse circulation air hammer excavation apparatus, wherein the cross-sectional area of the passage through which the working water and the excavation rock pieces are discharged is manufactured in a structure in which the cross-sectional area increases from the inlet side to the outlet side, so that the excavation rock pieces are inserted in the middle of the passage and are blocked It is characterized in that it can prevent.

1 is a cross-sectional view of a perforation bit device according to the prior art, wherein the perforation bit device 1 includes an inlet pipe 10 through which compressed air is introduced, a hammer 20 formed to surround the inlet pipe 10, and a hammer 20. It is mounted at the bottom of the perforation bit 30 to perform excavation, and is connected to the upper end of the hammer 20 to transmit power to the perforation bit 30, comprising a power transmission member 40, and a perforation bit 30 ), a number of cutting tips 31 that are in direct contact with the ground to be excavated are installed, and an inlet channel 32 in communication with the inlet pipe 10 and a discharge channel for discharging the excavated soil generated during excavation 33 is formed.

Accordingly, when the drilling bit 30 receives power from the power transmission member 40, the drilling operation is performed, and the excavated soil generated in the excavation process is compressed through the inlet pipe 10 and the inlet channel 32. It is discharged to the discharge channel 33 by air.

However, such a conventional drilling bit device 1 has a structure in which compressed air discharged through the discharge channel 33 of the drilling bit 30 is discharged to the outside of the drilling bit device 1 together with the excavated soil in the drilling hole. There is no big problem when drilling a solid rock mass, but when drilling a soft ground such as a tidal flat, there is a problem in that the excavated soil mixed with moisture blocks the discharge channel 33 and thus the excavated soil cannot be discharged smoothly.

In order to solve this problem, a reverse circulation drilling bit device as shown in FIG. 2 was developed. In the reverse circulation drilling bit device shown in FIGS. 2 and 3, compressed air flows into the inlet pipe, and the cylinder communicates with the inlet pipe, The piston hammer is accommodated in the cylinder and is raised and lowered by the inflow or discharge of compressed air, the drill bit is placed under the piston hammer, and the piston hammer hits the rock by the lowering motion of the piston hammer, and the discharge pipe is the piston hammer and drill bit. It is accommodated in, and discharges the excavated soil crushed by the hit of the drill bit to the outside, and the casing is formed to surround the inlet pipe.

Through this structure, the problem occurring in the structure as shown in Fig. 1 could be solved to some extent, but the compressed air injected through the inlet channels 171 formed on the outer circumferential surface of the expansion bit 170 collide with each other and cancel it out. There is a problem that the excavated soil discharge efficiency is lowered as the compressed air partially escapes through the gap, and the discharge channel 172 of the expansion bit 170 is formed in a passage structure with the same cross-sectional area so that the introduced excavated soil is in the middle of the passage. There was a problem that it was inserted in and blocked the passage.

[Prior technical literature]

Registered Patent No. 10-1627822

Registered Patent No. 10-2015668

In order to solve the above problems, the present invention is manufactured in a form in which the cross-sectional area increases from the inlet side to the outlet side of the discharge passage of the drilling rock piece, so that the drilling rock piece flowing into the discharge passage is not blocked and can be smoothly raised and discharged. Its purpose is to provide a new structure of hammer bits.

The technical configuration of the present invention created to achieve the above object is as follows.

The present invention relates to a bit mounted on a lower part of a DTH hammer of a reverse circulation air hammer excavation apparatus, comprising: a bit body 110 provided with a hammer mounting groove 115 mounted under the DTH hammer; A bit head 120 extending from a lower portion of the bit body 110 to have a relatively larger diameter than the bit body 110 so as to be integral with the bit body 110; A working water supply groove 130 formed in a vertical direction along the outer circumferential surface of the bit head 120 to serve as a descending passage for working water supplied from the ground; An air supply line 140 formed along the central axis of the bit body 110 and the bit head 120 to serve as a supply passage for compressed air; And, an excavation rock piece discharge line 150 that connects the lower surface and the upper surface of the bit head 120 and serves as an ascending passage for the work arm piece containing the working water, and includes, the excavation arm piece discharge line 150 Is characterized in that the cross-sectional area increases from the bottom of the bit head 120 to the top.

According to the configuration of the present invention, the excavation rock piece discharge line 150 is formed in a structure in which the cross-sectional area increases from the bottom of the bit head 120 to the top, so that the excavation rock piece flowing into the excavation rock piece discharge line 150 is discharged. It is inserted in the middle to prevent clogging, and smooth ascending discharge of the excavated rock piece is possible.

1 to 3 show prior art.
Fig. 4 shows a specific embodiment of the present invention.
5 shows another specific embodiment of the present invention.
Fig. 6 shows another specific embodiment of the present invention.

The present invention relates to a bit mounted under the DTH hammer of a reverse circulation air hammer excavator, and each embodiment is shown in FIGS. 4 to 6.

The present inventor's reverse circulation hammer bit is composed of a bit body part 110 and a bit head part 120, and an air supply line 140 and an excavation arm piece discharge line 150 are provided therein.

The bit body 110 is provided with a hammer mounting groove 115 so that it can be mounted on the lower part of the DTH hammer, and although not separately shown in the accompanying drawings, a spline guiding the vertical movement as necessary is vertical along the outer circumferential surface. It may be formed in a number of directions.

The bit head 120 extends from the lower portion of the bit body 110 to have a relatively larger diameter than the bit body 110 to form an integral body with the bit body 110 and directly during drilling (excavation) work. It touches the ground and transmits the impact and rotational power.

The outer circumferential surface of the bit head 120 is provided with a packing mounting groove 125 for mounting a packing that is in close contact with the inner surface of the casing mounted to surround the upper portion of the bit head 120, and the casing and the bit head 120 ) To maintain airtightness and watertightness.

That is, the working water is prevented from flowing into the gap between the casing and the bit head 120 during the descending process, so that the working water is properly supplied to the lower portion of the bit head 120.

The working water supply groove 130 is formed in a vertical direction along the outer circumferential surface of the bit head 120 to serve as a descending passage for the working water supplied from the ground.

The air supply line 140 is formed in the vertical direction along the central axis of the bit body 110 and the bit head 120 to serve as a supply passage for compressed air.

The excavation arm piece discharge line 150 connects the lower surface and the upper surface of the bit head 120 or connects the lower inner side of the bit head 120 and the upper surface of the bit head 120, and includes water for work. It serves as an ascending passage for the old working rock pieces.

The excavation rock piece discharge line 150 is processed into a structure in which the cross-sectional area continuously increases from the bottom of the bit head 120 to the top, as can be seen in the cross-sectional structure shown in FIGS. When this flows in, the cross-sectional area increases toward the top, so that it can be smoothly raised and discharged without being blocked in the middle of the passage.

Looking at a specific embodiment of the present invention shown in Figs. 4 to 6 are as follows.

(1) First Embodiment-See Fig. 4

Referring to the first embodiment shown in FIG. 4, from the lower end of the working water supply groove 130, along the lower surface of the bit head 120, extends in the direction of the central axis of the bit head 120 to induce working water. A work water guide groove 135 serving as a passage is formed.

Therefore, the working water supplied along the working water supply groove 130 is evenly spread on the lower surface of the bit head 120 along the working water guide groove 135.

The lower surface of the bit head 120 is provided with an excavation rock piece processing space 160 that is recessed to deepen in the direction of the central axis, so that the excavation rock piece generated during the excavation process is provided with the excavation rock piece discharge line 150 A space to temporarily stay is provided before flowing into the excavated rock piece to smoothly flow into the excavation rock piece discharge line 150 together with the working water.

The suction incision groove 170 is cut across the drilling rock piece processing space 160 and connected to the air supply line 140 and the drilling rock piece discharge line 150, and compressed air supplied through the air supply line 140 It serves as an inlet through which the excavation rock pieces temporarily accommodated in the excavation rock piece processing space 160 and the working water are introduced together by the pressure raised and discharged through the excavation rock piece discharge line 150.

4, the suction incision groove 170 is cut in a "+" shape on the lower surface of the bit head 120, and the "intake incision groove 170" corresponding to the central axis of the air supply line 140 The +"-shaped center area is not blocked, but is crooked. If it is a form that can serve as an inlet for the inflow of excavated rock pieces and working water, it can be cut in the form of "Y" or in the form of "*".

The suction incision groove 170 may be provided in a lower area of the position where the excavation arm piece discharge line 150 is formed.

During the excavation process, when compressed air exits the air supply line 140 and rises and discharges through the excavation arm piece discharge line 150 through the internal space 175 formed by the suction incision groove 170, the pressure of the compressed air As a result, the drilling arm piece and the working water are introduced through the suction incision groove 170 and rise together along the drilling arm piece discharge line 150. Once the drilling arm piece passes through the suction incision groove 170, the drilling arm piece discharge line 150 When introduced into the excavation rock piece discharge line 150, the cross-sectional area is gradually increased as it goes toward the upper exit, so that it can be raised and discharged smoothly without being blocked in the middle of the passage.

(2) Second embodiment-see Fig. 5

The second embodiment has a structure in which an excavation rock piece processing space 160 and an air guide space 180 divided by a partition wall are provided.

In the case of the second embodiment, the working water supply groove 130 extends along the lower surface of the bit head 120 in the direction of the central axis of the bit head 120 to serve as a guide passage for working water. A groove part 135 is provided, and an excavation rock piece processing space 160 is provided in which the lower surface of the bit head 120 is recessed to deepen toward the central axis.
As can be seen in the cross-sectional view of FIG. 5, the air induction space 180 is formed inside the lower part of the bit head 120, and is divided into an excavation rock piece processing space 160 and a partition wall. Located.
The air induction space 180 is connected to the lower end of the air supply line 140 and the lower end of the drilling arm piece discharge line 150, and guides compressed air supplied through the air supply line 140 to the drilling arm piece discharge line 150 It acts as a channel to do.
That is, the compressed air supplied through the air supply line 140 passes through the air guide space 180 and exits the excavation arm piece discharge line 150.
The suction incision groove 170 is a partial area of the partition wall that divides the excavation rock piece processing space 160 and the air guide space 180, and connects the excavation rock piece processing space 160 and the air guide space 180. .
This suction incision groove 170 is for work with the drilling arm pieces temporarily accommodated in the drilling arm piece processing space 160 by the pressure that the compressed air supplied through the air supply line 140 is discharged through the drilling arm piece discharge line 150 It serves as an inlet through which water flows together, and as shown in FIG. Etc.).
The drilling rock pieces and the working water introduced through the suction incision groove 170 are discharged by rising together along the drilling rock piece discharge line 150 through the air guide space 180 along the flow of compressed air.

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Even in the case of the second embodiment, once the drilling arm piece passes through the suction incision groove 170, it is introduced into the drilling arm piece discharge line 150 via the air flow space 180, and the drilling arm piece discharge line 150 is the upper outlet. It is manufactured in a form in which the cross-sectional area gradually increases toward the side, so that the excavated rock pieces can be raised and discharged smoothly without being blocked in the middle of the passage.

(3) Third embodiment-see Fig. 6

In the third embodiment, the air supply line 140 and the air discharge line 145 in the bit head 120 are not connected to each other with the excavation arm piece discharge line 150 and maintain a separate path.

In the case of the third embodiment, the working water supply groove 130 extends along the lower surface of the bit head 120 in the direction of the central axis of the bit head 120 to serve as a guide passage for working water. A groove part 135 is provided, and an excavation rock piece processing space 160 is provided in which the lower surface of the bit head 120 is recessed to deepen toward the central axis.

The suction incision groove 170 is connected to the excavation rock piece discharge line 150 by cutting a part of the excavation rock piece processing space 160, and the excavation rock piece temporarily accommodated in the excavation rock piece processing space 160 and the working water flow in together. It serves as an inlet, and such a suction incision groove 170 may be provided in a lower area of a position where the excavation arm piece discharge line 150 is formed.

The air discharge line 145 is connected to the lower end of the air supply line 140, and is connected to the upper surface of the bit head 120 through a separate discharge passage isolated from the drilling arm piece discharge line 150.

Therefore, the pressure at which the compressed air supplied through the air supply line 140 is discharged through the air discharge line 145 acts on the outlet side of the drilling arm piece discharge line 150 (on the upper surface of the bit head 120). In this way, while acting as an ascending suction force inside the drilling rock piece discharge line 150, the drilling rock piece and the working water are introduced through the suction incision groove 170, and they are upwardly discharged along the drilling rock piece discharge line 150. .

Even in the case of the third embodiment, once the excavation arm piece passes through the suction incision groove 170 and enters the excavation arm piece discharge line 150, the cross-sectional area gradually increases toward the upper exit side of the excavation arm piece discharge line 150. It can be raised and discharged smoothly without being blocked in the middle of the passage.

As described above, specific embodiments of the present invention have been described with reference to the accompanying drawings, but the protection scope of the present invention is not necessarily limited to these embodiments, and various design changes and notices within the scope of not changing the technical gist of the present invention In the case of addition or deletion of technology, simple numerical limitation, etc., it is clarified that it falls within the scope of protection of the present invention.

110: bit body
115: mounting groove
120: bit head
125: packing mounting groove
130: work water supply groove
135: work water guide groove
140: air supply line
145: air discharge line
150: excavation rock piece discharge line
160: excavation rock piece processing space
170: suction incision groove
175: internal space
180: air induction space

Claims (5)

It relates to a bit mounted under the DTH hammer of the reverse circulation air hammer excavator,
A bit body portion 110 provided with a hammer mounting groove 115 mounted under the DTH hammer;
A bit head 120 extending from a lower portion of the bit body 110 to have a relatively larger diameter than the bit body 110 so as to be integral with the bit body 110;
A working water supply groove 130 formed in a vertical direction along the outer circumferential surface of the bit head 120 to serve as a descending passage for working water supplied from the ground;
A working water guide groove that extends from the lower end of the working water supply groove 130 in the direction of the central axis of the bit head 120 along the lower surface of the bit head 120 to serve as a guide passage for working water ( 135);
An air supply line 140 formed along the central axis of the bit body 110 and the bit head 120 to serve as a supply passage for compressed air;
An excavation arm piece discharge line 150 that connects the lower inner side of the bit head part 120 and the upper surface of the bit head part 120 and serves as an ascending passage for the work arm piece containing working water;
An excavation rock piece processing space 160 in which a lower surface of the bit head 120 is concavely entered so as to deepen toward a central axis direction;
It is formed inside the lower portion of the bit head 120, is divided into the drilling rock piece processing space 160 and a partition wall, and is located above the drilling rock piece processing space 160, and the lower end of the air supply line 140 And an air induction space 180 connected to the lower end of the excavation arm piece discharge line 150 to serve as a passage for guiding the compressed air supplied through the air supply line 140 to the excavation arm piece discharge line 150. And,
A partial area of the partition wall partitioning the excavation rock piece processing space 160 and the air induction space 180 is cut to connect the excavation rock piece processing space 160 and the air induction space 180, and the air supply line Suction serving as an inlet through which compressed air supplied through 140 flows into the drilling rock piece temporarily accommodated in the drilling rock piece processing space 160 by the pressure discharged through the drilling rock piece discharge line 150 Incision groove 170;
Including,
The drilling arm piece and the working water introduced through the suction incision groove 170 by the pressure of compressed air discharged through the drilling arm piece discharge line 150 via the air induction space 180, the drilling arm piece discharge line ( 150) ascending together,
The drilling rock piece discharge line 150 is processed in a structure in which the cross-sectional area increases from the bottom of the bit head 120 to the top, so that when the drilling rock piece flows into the lower inlet side, it is blocked in the middle of the passage in the process of being transferred to the upper outlet side. Reverse circulation hammer bit characterized in that it is discharged smoothly without this. It relates to a bit mounted under the DTH hammer of the reverse circulation air hammer excavator,
A bit body portion 110 provided with a hammer mounting groove 115 mounted under the DTH hammer;
A bit head 120 extending from a lower portion of the bit body 110 to have a relatively larger diameter than the bit body 110 so as to be integral with the bit body 110;
A working water supply groove 130 formed in a vertical direction along the outer circumferential surface of the bit head 120 to serve as a descending passage for working water supplied from the ground;
A working water guide groove that extends from the lower end of the working water supply groove 130 in the direction of the central axis of the bit head 120 along the lower surface of the bit head 120 to serve as a guide passage for working water ( 135);
An air supply line 140 formed along the central axis of the bit body 110 and the bit head 120 to serve as a supply passage for compressed air;
An excavation arm piece discharge line 150 that connects the lower surface and the upper surface of the bit head 120 and serves as a rising passage for the work arm piece containing working water;
An excavation rock piece processing space 160 in which a lower surface of the bit head 120 is concavely entered so as to deepen toward a central axis direction;
A partial area of the excavation rock piece processing space 160 is cut to be connected to the excavation rock piece discharge line 150, and serves as an inlet through which both the excavation rock piece temporarily accommodated in the excavation rock piece processing space 160 and the working water flow in. Suction incision groove 170; And,
An air discharge line 145 connected to the lower end of the air supply line 140 and connected to the upper surface of the bit head 120 through a separate discharge passage isolated from the excavation arm piece discharge line 150;
Including,
The compressed air supplied through the air supply line 140 is discharged through the air discharge line 145, and the drilling rock piece and the working water introduced through the suction incision groove 170 through the drilling rock piece discharge line ( 150) ascending together,
The drilling rock piece discharge line 150 is processed in a structure in which the cross-sectional area increases from the bottom of the bit head 120 to the top, and when the drilling rock piece flows into the lower inlet side, it is blocked in the middle of the passage in the process of being transferred to the upper outlet Reverse circulating hammer bit, characterized in that it is discharged smoothly without this. In claim 1 or 2,
A packing mounting groove 125 for mounting a packing in close contact with the inner surface of the casing mounted to surround the upper portion of the bit head 120 on the outer circumferential surface of the bit head 120;
Reverse circulation hammer bit, characterized in that provided.
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