JP2695621B2 - Cutting line device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting-end conduit device, and more particularly to a cutting-end conduit device used in a horizontal bowling cutting method in which slime (excavated soil) is prevented from accumulating in a gap between movable parts of a bit head. Things.

[0002]

2. Description of the Related Art FIG. 13 is a sectional view of a conventional cutting-destination conduit device, FIG. 14 is a front view thereof, and FIG. 15 is a sectional view taken along line AA of FIG.

[0003] In FIGS. 13 to 15, a cylinder 5 is fixed inside a front pipe 1, and a main body of an air hammer 7 is housed in the cylinder 5. Bits 3 are implanted around the distal end of the front pipe 1, and the inside of the front pipe 1 is partitioned by a plate 13 to form a small section 14, and a cover plate 15 is formed so as to cover the opening of the small section 14. Is installed. The bit head 7a is inserted through the hole formed in the cover plate 15.
Appear in the small section 14 in the form in which
Is installed. A hose 11 for supplying compressed air is provided at the rear end of the cylindrical body 5, and the compressed air supplied from the hose 11 drives the air hammer 7, and the bit head 7 a is moved through the thrust by the compressed air hammer 7. It vibrates in the direction and breaks the rock.

[0004]

However, even if the cover plate 15 is attached to the leading pipe 1 in the conventional cutting destination pipe apparatus in this way, slime enters from the gap between the bit head 7a and the cover plate 15, and The slime also enters the gap between the bit head 7a and the front pipe 1 or the cylindrical body 5 accommodating the main body of the air hammer 7 and accumulates, resulting in a disadvantage that the operation of the bit head 7a is adversely affected. In the worst case, there was a disadvantage that the bit head 7a could not vibrate and could not be cut.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks, and to prevent the slime from accumulating also in the gap between the bit head and the cover plate and in the gap between the bit head and the leading pipe or the cylinder. A plurality of blow holes for blowing compressed air toward the gap between the bit head and the gap between the bit head and the leading conduit or the cylindrical body are provided on the side wall surface of the bit head, and the life of the hammer head is prolonged. It is an object of the present invention to provide a cutting channel device having a structure.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned object, a cutting destination pipe device of the present invention applies a propulsive force and a rotating force to the leading pipe, and has a structure for cutting down the ground. in the conduit system, the Ru an outer diameter substantially concentric arcs of the leading pipe co
The diameter of the pipe is greater than or less than the radius
The bit head front and the bit connected to the bit head front.
A head body having a rear end of the head and a tubular body fixedly disposed in the front conduit, and the bit head is disposed at the front end of the front conduit such that the arc projects outside the outer diameter of the front conduit. A down-the-hole hammer for pressing the bit head; and a cover plate disposed at the tip end of the forward conduit for restricting the bit head in the radial direction, and compressed air is applied to the side wall surface of the bit head. Ri Na and a plurality of holes for blow formed for blowing, the blowing hole,
Gap formed by the side wall surface and cover plate at the front of the bit head
And / or the down-the-ho
Compressed air toward the gap formed by the
It is characterized by being perforated to blow out .

The blow hole is directed toward a gap formed between the side wall surface of the front part of the hammer head and the cover plate and / or a gap formed between the side wall surface of the rear part of the hammer head and the cylindrical body of the down-the-hole hammer. It is perforated to blow out compressed air.

When the size of the bit head is smaller than the radius of the leading pipe, the cover plate provided at the leading end of the leading pipe for restricting the movement of the bit head in the radial direction is composed of two sheets. I have.

[0009]

The compressed air blown out from the blow hole provided on the side wall surface of the bit head blows through the gap between the bit head and the front pipe or the tubular body and the gap between the hit head and the cover plate. No slime is deposited in the gaps between the head and the cover plate, and the gaps between the bit head and the leading conduit or the tip of the cylindrical body. Since the number of buttons can be increased at the tip of the bit head, the life of the bit head is prolonged.

[0010]

FIG. 1 is a partial sectional view of an embodiment of a cutting destination conduit device according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is BB of FIG.
4 is an enlarged front view of the tip of the bit head, and FIG. 5 is a partial cross-sectional view on the right side of FIG. In FIGS. 1 to 5, a tubular body 5 is fixed inside a front conduit 1 via a fixing member 10, and a main body of a down-the-hole hammer 2 is housed in the tubular body 5. As shown in FIG. 4, the bit head 9 pressed by the down-the-hole hammer 2 has an arc that is substantially concentric with the outer diameter of the front conduit 1 at the end opposite to the center of the front conduit 1. A plurality of buttons 4 such as tungsten carbide (five in FIG. 2 and FIG. 4 are shown) are implanted along.
In this manner, by forming the tip of the bit head 9 in a shape of a circular arc substantially concentric with the outer diameter of the leading conduit 1, a large number of buttons 4 can be implanted. 9 can be extended.

The bit head 9 having this circular arc is disposed at the tip of the leading conduit 1 so that the circular arc extends outside the outer diameter of the leading conduit 1. It is covered with two cover plates 8. The cover plate 8 is fixed to the cylindrical body 5 side by a fixing plate 6, and has a structure for reinforcing the deflection of the cover plate 8. Then, the bit head 9 is
In the horizontal direction, that is, in the radial direction.

The bit head 9 has a shape larger than the radius of the leading pipe 1, so that a bit slightly larger than the leading pipe 1 can be drilled with the bit head 9. Note that the bit head 9 in FIG. 1 shows a state in which the position is at the maximum position in the direction of the distal end of the front pipe 1.

The surface of the bit head 9, that is, the front portion 9a of the bit head has a rectangular shape as shown in FIGS. 2 and 4. However, the front portion 9a of the bit head is not necessarily rectangular. Alternatively, the shape may be another shape, for example, a circle.

The down-the-hole hammer 2 is driven by compressed air supplied from a compressed air supply hose 11 provided at the rear end of the cylindrical body 5, and the bit head 9 is moved through the down-the-hole hammer 2 by the thrust. It vibrates in the direction and breaks the rock.

An air hole 9d and a blow hole 9e are formed in the bit head 9 so as to communicate with a compressed air supply hole 9c provided in the center of the bit head 9. The air holes 9d are connected to the surface of the bit head 9 on which the buttons 4 such as tungsten carbide are implanted, and the blow holes 9e are the side wall surfaces of the bit head front 9a and the bit head rear 9b. It is connected to. Blow hole 9
e is one on the side wall surface of the bit head front part 9a in FIG.
Although only two are drawn on the side wall surface of the bit head rear portion 9b, a plurality of blow holes 9e are formed in each of the side wall surfaces of the bit head front portion 9a and the bit head rear portion 9b.

The outlet of the blow hole 9e is
As shown in FIG. 1, the compressed air to be blown is formed at a position where the compressed air comes into each gap between the distal end portion of the cylindrical body 5 and the front conduit 1 and the cover plate 8.

In the cutting destination conduit device of the present invention configured as described above, as shown in FIG. 11, a pipe 21 to be buried is attached to a cutting machine 18 installed in a vertical hole 17, and this pipe 21 is attached to, for example, 1 pipe. Propulsion while rotating at a slow speed of several revolutions per minute. The leading pipe 1 moves forward while cutting the rock with the bit head 9. The slime is discharged from the pit 17 through a discharge hole and a pipe 21 (not shown).

When moving forward while cutting the rock with the bit head 9 of the leading conduit 1, slime tries to enter from the gap between the bit head front part 9a and the cover plate 8, but the blow hole 9e.
The slime is pushed back by the compressed air blown out from the slime, and the slime does not enter the down-the-hole hammer 2 from the gap between the bit head front portion 9a and the cover plate 8.

Further, for example, the slime is changed to the bit head front part 9.
a and the cover plate 8, the blow hole 9 e formed in the rear portion 9 b of the bit head,
The slime cannot be further entered into the down-the-hole hammer 2 from each gap between the bit head 9 and the tip of the tubular body 5 and the front conduit 1, and returns to the bit head front part 9a. It is pushed back from the gap with the cover plate 8. In other words, compressed air blows through the gap between the bit head front part 9a and the cover plate 8 and the gap between the bit head rear part 9b and the front pipe 1 or the cylinder 5, so that slime cannot be deposited on the movable part of the bit head 9. Becomes

FIG. 6 is a partial cross-sectional view of another embodiment of the cutting-end conduit device according to the present invention, FIG. 7 is a front view thereof, and FIG.
9 is an enlarged front view of the tip of the bit head, and FIG. 10 is a partial sectional view on the right side of FIG.

6 to 10, a cylindrical body 5 is fixed to the inside of the front conduit 1 via a fixing member 10.
The main body of the down-the-hole hammer 2 is housed in the cylindrical body 5. The tip of the bit head 19 is disposed so as to be substantially at the same position as the bit 3 implanted on the peripheral edge of the tip of the leading conduit 1.

As shown in FIG. 9, the bit head 19 pressed by the down-the-hole hammer 2 has a distal end opposite to the center of the front conduit 1 having an arc substantially concentric with the outer diameter of the front conduit 1. A plurality of buttons 4 such as tungsten carbide (three buttons are shown in FIGS. 7 and 9) are implanted along the arc. Thus, the bit head 19
Is formed in a circular arc that is substantially concentric with the outer diameter of the leading conduit 1, so that a large number of buttons 4 can be implanted, so that the wear time of the buttons 4 is extended, and the bit head 1
9 can be extended. The bit head 19 in the case of FIGS. 6 to 10 has a shape smaller than the radius of the leading conduit 1.

The bit head 19 having this circular arc is disposed at the tip of the leading conduit 1 so that the circular arc extends outside the outer diameter of the leading conduit 1. It is covered with two cover plates 15. The cover plate 15
Thus, the movement of the bit head 19 in the horizontal direction, that is, in the radial direction is restricted.

The bit head 19 shown in FIG. 6 is shown in a state where its position is moved to the maximum in the direction of the front end of the front conduit 1. As shown in FIGS. 7 and 9, the surface portion of the bit head 9, that is, the front portion 19a of the bit head has a rectangular shape. Notch 19 at end
f are formed respectively. The notch 19f is 2
Each of the cover plates 15 is engaged with the cover plate 15 to restrict the movement of the bit head 19 in the radial direction. Each cover plate 15 is fixed to a fixed plate 6 attached to the surface of the cylinder 5. The interior of the front conduit 1 is partitioned by a fixing plate 6 to form a small section 14, and the opening of the small section 14 is attached so that two cover plates 15 close the opening. The shape of the bit head front portion 19a does not necessarily have to be rectangular as shown in FIGS. 7 and 9, but may be another shape, for example, a circle.

The down-the-hole hammer 2 is driven by compressed air supplied from a compressed-air supply hose 11 provided at the rear end of the cylindrical body 5, and the bit head 19 is driven through the down-the-hole hammer 2 by the thrust. It vibrates in the direction and breaks the rock.

An air hole 19d and a blow hole 19e are formed in the bit head 19 so as to communicate with a compressed air supply hole 19c provided in the center of the bit head 19.
The air hole 19d is connected to the surface of the bit head 19 where the button 4 such as tungsten carbide is planted, and the blow hole 19e is formed in the side wall surface of the front portion 19a of the bit head and the rear portion 19b of the bit head. It is connected. The blow hole 19e is shown in FIG.
a, and only two are drawn on the side wall surface of the bit head rear part 19b, but the bit head front part 19a,
A plurality of blow holes 19e are formed in each side wall surface of the bit head rear portion 19b.

The blow-out opening of the blow hole 19e is formed at a position where the compressed air to be blown comes to each gap between the cylindrical body 5, the front end of the front conduit 1, and the cover plate 15, as shown in FIG. .

In the cutting destination conduit device of the present invention thus constructed, as shown in FIG. 11, a pipe 21 to be buried is attached to a cutting machine 18 installed in a vertical hole 17, and this pipe 21 is attached to, for example, 1 Propulsion while rotating at a slow speed of several revolutions per minute. The leading pipe 1 advances while cutting the rock with the bit 3. The slime is discharged from the pit 17 through the pipe 21. When the bedrock is hard, down the hole hammer 2
Is used. The bit head 19 pressed by the down-the-hole hammer 2 oscillates in the thrust direction of the leading pipe 1 to break rock and enable the leading pipe 1 to be propelled.

When moving forward while cutting the rock with the bit 3 of the leading pipe 1 or when propelling the leading pipe 1 while crushing the rock by vibrating the bit head 19 in the thrust direction by using the down-the-hole hammer 2, the slime may be The slime is pushed back by the compressed air blown out from the blow hole 19e, and the slime is pushed back through the gap between the head front portion 19a and the cover plate 15, and the down-the-hole hammer is pushed through the gap between the bit head front portion 19a and the cover plate 15. The slime does not enter in the direction of 2.

Further, for example, the slime is changed to the bit head front part 1.
Even if the small section 14 can be inserted from the gap between the cover 9a and the cover plate 15, the slime is compressed air blown out from the blow hole 19e formed in the bit head rear part 19b, and the slime is compressed by the bit head rear part 19b and the cylinder 5 and It is not possible to further enter the gap hammer 2 from each gap with the front end of the leading pipe 1, and the bit head front portion 19 a and the cover plate 15 are returned.
Is pushed back from the gap. That is, the bit head front part 19
Compressed air blows through the gap between a and the cover plate 15 and the gap between the bit head rear portion 19b and the leading conduit 1 or the cylinder 5,
Slime cannot be deposited on the movable part of the bit head 19.

FIG. 12 is an explanatory view of the shape of another embodiment of the bit head of the present invention. In the figure, a notch 19f is formed in the bit head 19 between the rear end and the front end of the front conduit 1 on the center side, and the notch 19f is formed.
Protrusions 15a engaging with f are provided on the cover plate 15, respectively. The projection 15a provided on the cover plate 15 restricts the movement of the bit head 19 in the radial direction.

The other parts are configured in the same manner as those shown in FIGS. 9 and 10, and therefore the description thereof is omitted.

[0033]

As described above, according to the present invention, since a plurality of blow holes are formed in the side wall surface of the bit head, the gap between the bit head and the cover plate and the bit head and the cylinder are formed. Compressed air blows through the gap with the body or the leading conduit, and no slime is deposited on the movable part of the bit head.

As shown in FIGS. 4 and 9, the bit head has a circular arc substantially concentric with the outer diameter of the leading conduit at the tip end opposite to the center of the leading conduit. A plurality of buttons such as tungsten carbide can be implanted, so that the wear time of the buttons can be extended and the life of the bit head can be extended.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of an embodiment of a cutting destination conduit device according to the present invention.

FIG. 2 is a front view thereof.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an enlarged front view of the tip of a bit head.

FIG. 5 is a partial sectional view on the right side of FIG. 4;

FIG. 6 is a partial cross-sectional view of another embodiment of the cutting destination pipe device according to the present invention.

FIG. 7 is a front view thereof.

FIG. 8 is a sectional view taken along line CC of FIG. 6;

FIG. 9 is an enlarged front view of the tip of a bit head.

FIG. 10 is a partial sectional view on the right side of FIG. 9;

FIG. 11 is an explanatory diagram of a use state.

FIG. 12 is an explanatory view of the shape of another embodiment of the bit head of the present invention.

FIG. 13 is a cross-sectional view of a conventional cutting destination conduit device.

FIG. 14 is a front view thereof.

15 is a sectional view taken along line AA of FIG.

[Description of Signs] 1 front conduit 2 down-the-hole hammer 3 bit 4 button 5 cylinder 8 cover 9 bit head 9a bit head front 9b bit head rear 9e blow hole 15 cover 19 bit head 19a bit head front 19b bit Head rear 19e Blow hole 19f Notch

Claims (5)

(57) [Claims] An abrasion destination conduit device having a structure for applying a propulsive force and a rotating force to an apex conduit and abrading the ground, comprising a circular arc substantially concentric with the outer diameter of the aforesaid conduit. With the front of the bit head with a size larger than the radius.
A bit head having a bit head rear portion connected to the bit head front portion, and a cylinder fixedly disposed in the front conduit, and the bit head having the arc formed at the front conduit front end. A down-the-hole hammer that is arranged so as to protrude outside the outer diameter of the tip pipe and presses the bit head, and a cover plate that is arranged at the tip of the tip pipe that regulates the radial movement of the bit head. comprising a, and the plurality of holes for blowing for blowing compressed air on the side wall surface of the bit head Ri Na is formed, the blowing hole, the side wall surface of the front bit head and the cover plate
And / or sidewalls at the rear of the bit head
Between the surface and the down-the-hole hammer cylinder
A cutting destination conduit device, which is provided at a position where compressed air is blown toward the gap . 2. A forward conduit device having a structure in which a propulsive force and a rotational force are applied to the forward conduit to cut down the underground, wherein the forward conduit device has a circular arc substantially concentric with the outer diameter of the forward conduit and a radius of the forward conduit. The front of the bit head with the following dimensions
A bit head having a bit head rear portion connected to the bit head front portion, and a cylinder fixedly disposed in the front conduit, and the bit head having the arc formed at the front conduit front end. A down-the-hole hammer that is arranged so as to protrude outside the outer diameter of the tip pipe and presses the bit head, and a cover plate that is arranged at the tip of the tip pipe that regulates the radial movement of the bit head. comprising a, and the plurality of holes for blowing for blowing compressed air on the side wall surface of the bit head Ri Na is formed, the blowing hole, the side wall surface of the front bit head and the cover plate
And / or sidewalls at the rear of the bit head
Between the surface and the down-the-hole hammer cylinder
A cutting destination pipe device, which is provided so as to blow compressed air toward the gap . 3. The cutting destination according to claim 2 , wherein the bit head has an engaging portion formed thereon, and the cover plate has a shape for engaging with the engaging portion. Conduit device. The method according to claim 4, wherein said engaging portion claims, characterized in that it is formed in the rear end portion of the bit head of the center side of the leading pipe
3. The cutting destination pipe device according to 3 . 5. A method according to claim 3, wherein said engaging portion is formed between the tip and the rear end of the bit head
A cutting destination conduit device as described in the above.