JPS63167889A - Multi-air hammer device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-air hammer device, in particular a multi-air hammer device that moves a piston up and down using pressurized air and repeatedly applies impact vibration to a drill bit using the impact energy of the piston. This invention relates to a multi-air hammer device in which a plurality of air hammer drills are bundled together.

[Conventional technology]

An air hammer drill consists of a cylindrical case that supports a bit slidably in the axial direction at its tip, and a piston that is supported slidably in the axial direction within the case and hits the bit with its lower end. . Pressure chambers are formed above and below the piston, and the upper and lower pressure chambers are alternately pressurized with pressurized air from the outside to cause the piston to move up and down continuously.

Conventionally, a multi-air hammer device is known in which a plurality of such air hammer drills are tied together, a striking force is applied to each bit of these air hammer drills, and a large hole is drilled in rock etc. while rotating the east side of the tied air hammer drills. ing.

[Problem that the invention seeks to solve]

In the multi-air hammer device, the hole diameter is 80'.
When the hole diameter is larger than 0mm, each bit becomes larger and heavier, and is formed into a fan shape, which reduces the impact efficiency of the hammer and increases the cost. Since the bottom surface of the bit cannot be disposed over the whole area, it is necessary to make the bottom surface of each bit small in order to make the multi-air hammer device work effectively. Therefore, a space is formed between each bit of the air hammer drill. For this reason, if there are boulders or boulders in the stratum to be excavated,
These enter the space and become an obstruction, making it impossible to rotate in the worst case. Further, even when the bit can be rotated, stones and the like that enter the space also rotate together with the bit, resulting in the problem that the hole wall is scraped off by these stones and collapsed.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a multi-air hammer device that can prevent cobbles, boulders, etc. from entering between the bits of an air hammer drill and enable smooth rotation. shall be.

[Means for solving problems]

In order to achieve the above object, the present invention provides a multi-air hammer device in which a plurality of air hammer drills each having a bit are bundled in a casing, in which a space defined between the bits of the air hammer drill is provided with a space defined between the bits of the air hammer drill. It is characterized by the provision of spacers for filling.

[Effect]

That is, since the spacer is arranged in the space defined between the bits of the air hammer drill, cobbles, pumice, etc. do not enter the space, and the plurality of bundled air hammer drills can be rotated smoothly. I can do it.

〔Example〕

Preferred embodiments of the multi-air hammer device according to the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 relates to a multi-air hammer device that can be used underwater, and shows the multi-air hammer device according to the present invention in the case where three air hammer drills and bits are provided corresponding to each air hammer drill. FIG. 2 is a bottom view of FIG. 1;

In FIG. 1, the casing 10 has a hollow pipe 5 in its center.
It has a drainage passage 12 communicating with the drainage pipe 52 of No. 0, and three air hammer drills 14, 16, 18 (Fig. 2) are bundled around the drainage passage I2. The lower end of the air hammer drill 14 is sealed with a seal 20 at the bottom of the casing 10.
The bit 22 is supported by a spline connection or the like so as to be slidable by a predetermined amount in the axial direction, and a piston 28 that moves up and down by pressurized air is disposed above the bit 22. In addition, other air hammer drills 1
11i and 18 are also configured similarly to the air hammer drill 14, although not shown.

Further, as shown in FIG. 2, roller bits 44, 45, 46 are rotatably disposed between the bits 22, 24, 26. In addition, each roller bit 44.45.
The bottom of bit 46 is 1st lower than the bottom of bit 22.24.26.
As shown in the figure, it is higher by δ.

Further, the three air hammer drills and the like bound together by the casing 10 are surrounded by three arc-shaped guide members 47, 48, and 49, as shown in FIG. 48.49 Lower end 47
A, 48A, and 49A extend to the vicinity of the bottom surface of the bit.

On the other hand, the casing 10 has an air supply passage 30 that communicates with the air supply pipe 54 of the bore pipe 50 and supplies pressurized air from the air supply pipe 54 to each air hammer drill, and also has an air supply passage 30 for supplying pressurized air from the air supply pipe 54 to each air hammer drill. Air is supplied to the bore pipe 50 through passages 32, 34 in the bit, annular passages 35, 37, three exhaust passages 36, 38, 40 (Fig. 2) arranged in parallel in the casing 10, and the upper annular passage 39. It has an exhaust passage for discharging to an exhaust pipe 56.

The sides of each bit 22, 24, 26 have recesses 22A, 24.
A, 26A are formed, and a ring-shaped interference member 42 is loosely fitted in the recesses 22A, 24A, 26A, and the drainage passage 12
The lower part thereof extends up to the interference member 42 with a loose fit. The interference member 42 is slidable in the axial direction of the drainage passage 12, and interferes with each bit 22, 24, 26 to mutually restrict the amount of axial movement. Further, the bit 22 extends toward the center below the suction port 44 of the drainage passage 12, and a core cutter 22 for excavating the bottom of the suction port 44 is provided.
It has B.

The multi-air hammer device configured as described above first sends pressurized air supplied from the air supply pipe 54 to each air hammer drill 14, 16, 18 through the air supply passage 30, and moves the piston of each air hammer drill up and down. Bit 22.2
4. Hit and dig 26. At this time, the core cutter 22B of the bit 22 works together with the bit 22 to excavate the area below the suction port of the drainage passage 12. As a result, excavation remains will not be left in the central portion below the suction port.

Also, the recesses 22A, 24Δ of each bit 22, 24, 26,
26A is loosely fitted with the ring-shaped interference member 42, so that the movement in the axial direction is restricted, and the movement is approximately the same.

Also, there is a roller bit 4 between each bit 22, 24, 26.
4.45.46 are arranged, so that no cobbles, boulders, etc. get between the bits during excavation, and the cobbles and boulders are rolled and crushed, and the guide members 47, 48, and 49 also have their lower ends. Since 47A, 48Δ, and 49A extend to the vicinity of the bottom of the bit, it is possible to prevent boulders, boulders, etc. from entering from the hole wall side, and the bit rotation is performed smoothly.

On the other hand, the pressurized air that operated the piston passes through a passage 32, 34 in the bit, an annular passage 35, 37, three exhaust passages 36, 38, 40 arranged in parallel in the casing 10, and an upper annular passage 39. The air flows to the exhaust pipe 56 and is discharged to the ground side.

Further, the excavated earth and sand is sucked together with water by a suction pump or the like through the hollow member 42 and the drainage passage 12, and is collected on the ground side through the drainage pipe 52.

In this example, a roller bit is provided between the bits, but the invention is not limited to this.If the space defined between the bits is to be reduced or closed, a spacer may be used instead of a rotating body. Alternatively, a plurality of spacers may be arranged in one space. Also,
In this embodiment, the wet method 1, the so-called reverse method, is applied to earth removal, but the present invention is not limited to this. For example, water may be sent from the ground through the drainage passage 12 to the bottom of the hole using a pump to push excavated debris up and remove the earth. The present invention can also be applied to a multi-air hammer device using a positive circulation method or a dry method.

〔Effect of the invention〕

As explained above, according to the multi-air hammer device according to the present invention, a spacer is arranged between the bits of each air hammer drill so that there is no large space between the bits, and boulders, boulders, etc. This prevented the entry of
This eliminates the possibility of large stones being caught in the hole, thereby preventing the hole wall from collapsing, reducing digging resistance, and allowing the bit to rotate smoothly during digging.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a multi-air hammer device according to the present invention, FIG. 2 is a bottom view of the multi-air hammer device of FIG. 1, and FIG. 3 is an external view of the multi-air hammer device of FIG. 1. 10...Casing, 14.16.18...Air hammer drill, 22.24.26...Bit,
28... Piston, 441.45.46... Roller bit, 47.48.49... Guide member.

Claims (4)

[Claims] (1) In a multi-air hammer device made up of a plurality of air hammer drills, each equipped with a bit, tied together in a casing, in the space defined between the bits of the air hammer drills,
A multi-air hammer device characterized in that a spacer is provided to fill the space. (2) The multi-air hammer device according to claim (1), wherein the spacer is arranged so that its bottom surface is on the same level as or slightly above the bottom surface of the bit. (3) Claim (1), wherein the spacer is a rotating body or a roller bit that rotates due to resistance at the bottom of the hole.
The multi-air hammer device described in section. (4) The multi-air hammer device according to claim (1), wherein the lower end of the guide member surrounding the plurality of air hammer drills extends to the vicinity of the bottom surface of the bit.