JP2902990B2 - Drill bit machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating bit device, particularly an excavating bit device for a side hole. The present invention relates to an excavating bit device that can easily correct the direction of excavation when it deviates from a planned cutting direction.

[0002]

2. Description of the Related Art A conventional drill bit device is configured such that the outer diameter of a drill bit is larger or larger than the outer diameter of a drill pipe. For example, JP-A-2-29698
The structure of No. 9 is as follows.

FIG. 9 is a partial cross-sectional view of a conventional excavating bit device, and FIG. 10 is an explanatory view of engagement and disengagement between an inner bit portion and a ring bit portion. In FIGS. 9 and 10, a drill bit device 10 includes a ring bit portion 1 having a plurality of bits 30 made of a superalloy provided at a tip (tip surface).
8 and the inner bit portion 50 are engaged with each other, and the ring bit portion 18
The collar 26 is provided so as to be rotatable with respect to and fixed to the excavation pipe 34.

The inner bit portion 50 has a flange 38
Is a flange 4 provided at an end of the device portion 36.
2 and bolts or the like, and
The portion prior to 8 is engaged with the ring bit 18 while being inserted near the center of the ring bit 18.

[0005] Such engagement is provided by the engagement groove 16 provided on the surface of the flange 12 (the engagement groove 16 in FIGS. 11 and 12 described later) and the flange 38 of the inner bit portion 50. This is achieved by the concave-convex engagement with the convex portion 39.

An air hole 52 is provided near the center of the inner bit portion 50. The air hole 52 is connected to an air hole (not shown) formed in the flange 42 of the device portion 36, and digs out compressed air generated when the beating mechanism 40 hits and rotates the device portion 36. It is for exhausting from the lower end surface of the use bit device 10, that is, the front end surface.

The periphery of the ring bit portion 18 engaging with the inner bit portion 50 will be described in more detail.
1, with reference to FIG. 12, near the center of ring bit portion 18, insertion holes 32 into which portions of inner bit portion 50 beyond flange 38 are inserted are formed. Flanges 12 and 14 are formed in the portion. The diameter of the flange 14 is formed larger than the diameter of the flange 12.

On the surface of the flange 12, an engagement groove 16 for engaging with the flange 38 of the inner bit portion 50 is formed. The engaging groove 16 has such a width that the convex portion 39 protruding from the flange 38 of the inner bit portion 50 can be fitted.

Further, the body 8 between the flanges 12 and 14 has two slime grooves 22 as shown in FIG.
Is engraved. A slime passage 24 is opened in the slime groove 22.

The lower ends 26a and 26b are large diameter portions 28a and 2b.
Reference numeral 8b denotes a color component member, and the color component members 26a and 26b have a shape obtained by dividing a cylindrical body into two in the axial direction. The collar components 26a, 26
b is combined with the outer periphery of the body portion 8 in the circumferential groove 17 formed between the flanges 12 and 14 of the ring bit portion 18 so as to form a cylindrical shape, and the butt end face is welded to rotate around the body portion 8. A movable collar 26 is formed.

The large-diameter portion 28 of the collar 26 formed in this manner is fixed by welding to the tip of a drilling pipe 34, and is disposed on the surface of the flange 14 of the ring bit portion 18, as shown in FIG. It has a form.

[0012]

However, in the conventional drill bit apparatus shown in FIG. 9, when drilling a horizontal hole, the diameter of the flange 14 of the ring bit portion 18 is equal to the diameter (outer diameter) of the drill pipe 34. Because it is larger, the drill pipe 34
A gap is formed between the drilling hole 44 and the drilling pipe 3 due to its own weight.
There was a disadvantage that 4 fell.

Further, when the excavation direction deviates from the planned cutting direction, there is a disadvantage that the cutting direction of the excavation cannot be easily corrected. For example, when excavating a horizontal hole for sewage, the slope is slightly inclined so that the sewage flows smoothly. It is dug by being bent, causing a problem. It is desired that when the shift in the cutting direction of the excavation is detected, it can be easily corrected to the original cutting direction of the excavation.

The present invention has been made in view of the above points, and in excavation of a horizontal hole, the excavation pipe does not fall without adding a special device, and the cutting direction of the excavation is shifted. An object of the present invention is to provide an excavating bit device which can easily correct the original cutting direction.

[0015]

In order to solve the above-mentioned object, a drill bit device according to the present invention is provided with a collar which can be fixed to the tip of a drill pipe and a device portion which is rotated by being beaten by a beating mechanism. A bit device for drilling comprising: a bit device mounted and rotatably provided with respect to the collar, and having a plurality of bits provided on a distal end surface thereof, wherein the collar has an eccentric inner diameter center. And the tip of the bit device on the eccentric direction side of the collar based on the eccentricity of the center of the inner diameter of the collar.
Protrudes from the outer diameter of the drilling pipe, and the bit on the opposite side
It is characterized in that the tip of the device has a substantially outer diameter of a drilling pipe .

[0016]

[Action] Since the lower side of the drilling pipe in the drilling hole is in the same position as the drilling pipe, that is, there is no gap between the drilling hole and the drilling pipe, the drilling pipe does not fall and the drilling direction is not changed. When shifted, by rotating the drilling pipe in the direction opposite to the direction in which the inner diameter center of the collar is eccentric, the hole wall in the shifted direction is excavated without excavating the hole wall in the shifted direction, It can be corrected to the original drilling cutting direction.

[0017]

FIG. 1 is a partial sectional view of an embodiment of a drill bit device according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. The figure is exaggerated for ease of understanding.

In FIG. 1 to FIG.
The collar 2 is welded or screwed to the tip of
Is fixed. The inner diameter center O of the collar 2 is eccentric by a distance L from the excavation pipe 34 and the outer diameter center C of the collar 2.

The collar 2 in which the center of the inner diameter is eccentric
In addition, a bit device 1 is rotatably inserted, and a plurality of bits 30 are provided on a distal end surface of a bit portion 1-1 provided at a distal end of the bit device 1. Since the inner diameter center O of the collar 2 is eccentric by L from the center C of the drilling pipe 34, one of the side surfaces of the bit portion 1-1 is substantially at the same position as the drilling pipe 34, and the other of the side surface of the bit portion 1-1. Has a structure protruding from the excavation pipe 34. The opposite side of the bit device 1 from the bit unit 1-1 is fixed integrally with the device unit 36. In FIG. 2, reference numeral 6 denotes an air hole.

When excavating beside, the side where the excavation pipe 34 and the bit portion 1-1 substantially coincide is set downward, and excavation is performed. The bit portion 1-1 of the bit device 1 is also rotated by the device portion 36 which is beaten and rotated by the beating mechanism. However, since the bit portion 1-1 rotates about the eccentric inner diameter center O of the collar 2, A hole having a shape along the contour S of the bit portion 1-1 shown in FIG. 2 is excavated. As described above, since the excavation pipe 34 and the bit portion 1-1 are excavated with the side where they substantially coincide with each other, as shown in FIG. There is no gap between them, and the drill pipe 34 does not fall.

Further, for example, when the lower rock is hard and the cutting direction of the excavation is bent upward, the excavation pipe 34 is rotated by 180 ° so that the excavation pipe 34 and the bit portion 1-1 substantially coincide with each other. Excavation is performed with. In the excavation in this state, the upper side is almost the same as the outer diameter of the excavation pipe 34,
The lower side is excavated larger than the outer diameter of the excavation pipe 34, and the cutting direction of the excavation bent upward is corrected. As described above, when the cutting direction is bent, the cutting direction is bent by setting the side where the drill pipe 34 and the bit portion 1-1 are substantially coincident with each other to set the side where the drilling is bent. The wall surface on the opposite side of the direction is excavated larger than the diameter of the excavation pipe 34, that is, the outer diameter, so that the cutting direction of the excavation can be corrected. When the drilling pipe 34 is rotated, the drilling pipe 34 may be rotated by any means, and a conventional rotating device or a conventional rotating method is used.

The bit portion 1-1 has a structure fixed to the tip of the bit device 1 as shown in FIG. 1 and a bit portion 1-1 shown in FIG. 1 as shown in FIGS. A part having a structure that can be completely or partially pulled out from the excavation pipe 34 is used.

FIG. 4 is a sectional view showing one embodiment of a bit device which can be pulled out. In the figure, the pilot bit device 3 and the eccentric reamer 4 correspond to the bit portion 1-1 in FIG. 1, and the center O of the inner diameter of the collar 2 is a distance from the outer diameter center C of the excavation pipe 34 and the collar 2. It is eccentric by L. During excavation, the eccentric reamer 4 is eccentric as shown in the figure, and the rotation of the bit device 1 causes the rotation trajectory of the eccentric reamer 4 to be substantially at the same position as the excavation pipe 34 and protrudes from the excavation pipe 34 as shown in phantom lines.

FIG. 5 is a side view of another embodiment of the bit device that can be pulled out, and FIG. 6 is a side view of FIG. 5 at the time of excavation.
5 and 6, bit head units 5-1 and 5-
1 corresponds to the bit portion 1-1 in FIG. 1, and also in this case, the center of the inner diameter of the collar 2 is eccentric from the center of the outer diameter of the excavation pipe 34 and the collar 2. At the time of excavation, the rotation of the bit device 1 causes the bit head portions 5-1 and 5-2 to move as shown in FIG. 6, and the rotation locus of the bit diameter of the expanded bit device 1 becomes substantially the same position as the excavation pipe 34 and , Projecting from the excavation pipe 34. FIGS. 5 and 6 show two bit heads 5-1 and 5-2, but may include three or more bit heads.

FIGS. 4 and 5 show the bit device 1, that is, a bit device for drilling having a structure in which a portion corresponding to the bit portion 1-1 shown in FIG. 1 is pulled out from the drill pipe 34. Next, an excavating bit device having a structure partially pulled out from an excavating pipe will be described.

FIG. 7 is a partial sectional view showing an embodiment of a drill bit device having a structure in which a part of the bit portion can be pulled out from a drill pipe. 9, the same components as those in FIG. 9 are denoted by the same reference numerals.
This is the point that the center O of the inner diameter of the collar 2 attached to the tip is eccentric from the center C of the excavation pipe 34 or the like.

The collar 2 is fixed to the tip of the drill pipe 34 by means such as welding or screwing , and the center O of the inner diameter of the collar 2 is fixed to the drill pipe 34 or the collar 2.
Are eccentric by a distance L from the center C of the outer diameter.

The fixing method of attaching the collar 2 to the tip of the excavation pipe 34 is performed by dividing a cylindrical body having an eccentric inner diameter center O in FIG. 7 into two parts in the axial direction as shown in FIG. The color components 2a, 2 are not limited to those shown in FIG. 8 and may be arbitrarily divided into two.
b, the collar components 2a, 2b are inserted into the circumferential grooves 17 formed between the flanges 12, 14 of the ring bit portion 18.
The collar 2 that is rotatable with respect to the trunk 8 is formed by combining the outer periphery of the inner trunk 8 in a cylindrical shape and welding the butted end surfaces. The large diameter portion 7 of the collar 2 formed in this manner is fixed to the distal end portion of the excavation pipe 34 by welding and is in contact with the surface of the flange 14 of the ring bit portion 18 as shown in FIG. ing. At this time, one of the outer diameters of the large-diameter portion 7 of the collar 2 is substantially equal to the outer diameter of the excavation pipe 34, and the other of the outer diameter of the large-diameter portion 7 of the collar 2 is smaller than the outer diameter of the excavation pipe 34. It has a protruding structure.

The excavating operation of the excavating bit device shown in FIGS. 7 and 8 is the same as that of the conventional excavating bit device shown in FIG. It goes without saying that it can be done.
Further, the ring bit portion 18 and the inner bit portion 50 have a configuration corresponding to the bit portion 1-1 in FIG. 1, and the same excavation of the excavation hole 44 as described in FIG. 1 can be performed. The correction when the direction is deviated is the same as that of the excavation bit device of FIG.

[0030]

As has been described above, according to the present invention, the inner diameter center of the collar which can be secured to the distal end of the drill pipe eccentrically, on the basis of the eccentricity of the inner diameter center of the collar, the
The tip of the bit device on the eccentric side of the collar is a drilling pipe
It protrudes from the outside diameter, and the tip of the bit device on the opposite side is approximately
Since the outer diameter of the excavation pipe is set, the excavation pipe can be dug without falling due to its own weight. Further, when the excavation direction is deviated from the planned cutting direction in a solid rock or the like, the cutting direction of the excavation can be easily corrected.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of one embodiment of a drill bit device according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory view of an excavation hole.

FIG. 4 is a sectional view of an embodiment of a bit device that can be pulled out.

FIG. 5 is a side view of another embodiment of the pullable bit device.

FIG. 6 is a side view at the time of excavation in FIG. 5;

FIG. 7 is a partial cross-sectional view of one embodiment of a drill bit device having a structure in which a part of a bit portion can be pulled out from a drill pipe.

FIG. 8 is an exploded perspective view around a ring bit portion of the present invention.

FIG. 9 is a partial sectional view of a conventional drill bit device.

FIG. 10 is an explanatory view of engagement and disengagement of an inner bit portion and a ring bit portion.

FIG. 11 is an exploded perspective view around a ring bit portion.

FIG. 12 is an explanatory perspective view of an engagement portion between an inner bit portion and a ring bit portion.

[Explanation of symbols]

 Reference Signs List 1 bit device 1-1 bit portion 2 collar 3 pilot bit device 4 eccentric reamer 5-1 and 5-2 bit head portion 10 drill bit device 14 flange 18 ring bit portion 26 color 30 bit 34 drill pipe 36 device portion 40 hitting Mechanism 50 Inner bit part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21B 7/04 E21B 7/10 E21B 10/40

Claims (1)

(57) [Claims] 1. A collar that can be fixed to the tip of a drilling pipe, and a device that is attached to a device that is rotated by being beaten by a beating mechanism and that is provided rotatably with respect to the collar. And a bit device provided with the bit of (1), wherein the collar has an eccentric center of the inner diameter of the collar, and the collar has an eccentric center of the inner diameter of the collar.
The tip of the bit device on the eccentric side is the outer diameter of the drilling pipe.
And the tip of the bit device on the opposite side is approximately
A drill bit device having an outer diameter of a drill pipe .