JP2967775B1 - Cutter bit - Google Patents

Abstract

[PROBLEMS] A cutter bit excellent in wear resistance, and
Provided is a cutter bit capable of replacing only the tip of the cutter bit. SOLUTION: Carbide tips 5 (15) are provided on a cutter face plate (70) that is rotationally driven in front of a tunnel excavation device, and are provided on a rotation direction side of a cutting portion 4 (14) for cutting ground.
a, 15b). A carbide tip 6 (16) is also provided on the back side in the rotation direction of the cutting section 4 (14). Tip 23 with cutting part 4
And a main body 22 having an attachment portion 3 for attaching the cutter bit 20 to the cutter face plate (70) to form a divided structure. A connecting means (such as a bolt (not shown)) for connecting the distal end portion 23 and the main body 22 is provided. The division structure is an uneven structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter bit provided on a cutter face plate which is driven to rotate in front of a tunnel excavation device, and having a carbide tip on a rotation direction side of a cutting portion for cutting ground. It is.

[0002]

2. Description of the Related Art A cutter bit, which is provided in a large number on a cutter face plate rotatably driven in front of a tunnel excavating device such as a shield machine and has a carbide tip in a rotation direction side of a cutting portion for cutting ground, is known. is there.

FIG. 5 shows a conventional inner peripheral side cutter bit 50, in which (i) is a plan view, (j) is a front view, and (k) is a side view. FIG. 6 shows a conventional outer cutter bit 60 of which (l) is a plan view, (m) is a front view, (n) is a sectional view, and FIG. 7 is a conventional inner cutter bit 50. It is the schematic which shows the cutting situation of the ground due to.

As shown in FIGS. 5 and 6, the conventional inner cutter bit 50 and the conventional outer cutter bit 60 are respectively provided with super hard carbide tips 51 and 6.
1 is provided only on one side of the cutting portions 52 and 62 for cutting the ground. The side where the carbide tips 51 and 61 are provided corresponds to the rotation direction side of the cutter face plate 70 (only the carbide tip 51 shown in FIG. 7) shown in FIG. 7, and is a portion for cutting the ground.

[0005] The inner peripheral side cutter bit 50 is provided in the plane of the cutter face plate 70 so that the end 52a of the cutting portion 52 comes into contact with the cutting surface of the tunnel.
On the other hand, the outer peripheral side cutter bit 60 is
The second end 62a is provided on the periphery of the cutter face plate 70 such that the end 62a contacts the outer peripheral portion of the cutting surface of the tunnel.

As shown in FIG. 7, the cutting of the ground by the inner cutter bit 50 is performed by scraping the ground at the end 52a of the cutting portion 52 provided with the carbide tip 51. Do it.

[0007]

FIG. 8 is a schematic view showing the state of wear of a conventional inner peripheral side cutter bit 50. As shown in FIG. In the above-described conventional technique, the carbide tips 51, 61 are provided only on the rotation direction side of the cutting portions 52, 62, so that no consideration is given to the back wear of the cutter bits 50, 60. Therefore, as shown in FIG. 8, the abrasion shape of the cutting portion 52 (the cutting portion 62 is not shown) becomes abnormal, and the cutting performance decreases and the cutting portions 52, 6 are reduced.
There was a problem that the wear rate of No. 2 was also accelerated. Therefore, there is a problem that the torque (cutter torque) at the time of rotation of the cutter face plate 70 is increased, and the excavation speed of the tunnel excavation device is reduced. Further, when the wear of the cutting portion progresses, it is necessary to replace the entire cutter bit.

Incidentally, there is the following data indicating the state of wear of the conventional inner peripheral side cutter bit 50. After excavating 434.7 m using the inner peripheral side cutter bit 50, the carbide tip 5 of the inner peripheral side cutter bit 50 is excavated.
The length B in FIG. 5 of FIG.
A degree of wear had occurred. The length B of the cemented carbide tip 51 was initially 40 mm. The excavated soil is
It was a dirt clay layer and dip gravel layer with an N value of 50 or more.

Accordingly, an object of the present invention is to provide a cutter bit having excellent wear resistance and a cutter bit capable of replacing only the tip portion of the cutter bit.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 is a method for mounting a cutter face plate, which is rotationally driven in front of a tunnel excavating device, on a surface orthogonal to a cutting surface. It is a cutter bit having a carbide tip that substantially covers the rotation direction side of the cutting portion that cuts the ground, a carbide tip is also provided on the back side in the rotation direction of the cutting portion, and, The end of the carbide tip on the rotation direction side is covered with the carbide tip on the rotation direction side.

The cemented carbide tip includes, for example, a first cemented carbide tip provided on the rotation direction side of the cutting part, and a second cemented carbide tip provided on the back side in the rotation direction of the cutting part. , Is constituted. Each of the first carbide tip and the second carbide tip is, for example, a flat rectangular parallelepiped. Further, for example, the cemented carbide tip may have a substantially rectangular shape such that the first cemented carbide tip and the second cemented carbide tip are integrally formed.

According to the first aspect of the present invention, since the carbide tip is provided also on the back side in the rotation direction of the cutting portion, the wear resistance of the cutting portion can be suitably obtained.

According to a second aspect of the present invention, there is provided a cutter face plate rotatably driven at a front portion of a tunnel excavating device, which is mounted on a surface orthogonal to a cutting surface, and which is on a rotation direction side of a cutting portion for cutting ground. A cutter bit having a cemented carbide tip, a tip having the cutting portion, and a main body having an attachment portion for attaching the cutter bit to the cutter face plate, forming a divided structure, The split structure is
The tip portion and the main body are configured to be able to be fitted by an uneven structure, and the concave portion of the uneven structure sandwiches the convex portion of the uneven structure before and after in the rotation direction, and the convex portion is The recess has a substantially constant thickness along the protruding direction, while the recess has a substantially constant spacing along the depth direction.

In the concave-convex structure, one of the tip portion and the main body has a concave concave portion, and the other has a convex convex portion, and the concave portion and the convex portion are fitted. It is configured by making it possible.

According to the second aspect of the present invention, only the tip portion is replaced due to wear of the cutting portion, or only the tip portion is replaced in accordance with a change in the properties of the ground. can do.

According to a third aspect of the present invention, there is provided a cutter face plate rotatably driven at a front portion of a tunnel excavating device, which is mounted on a surface orthogonal to a cutting surface and which is on a rotation direction side of a cutting portion for cutting ground. A cutter bit having a cemented carbide tip, a tip having the cutting portion, and a main body having an attachment portion for attaching the cutter bit to the cutter face plate, forming a divided structure, The split structure is
The distal end portion and the main body are configured to be fitted by an uneven structure, and a connecting means for connecting the distal end portion and the main body is provided. In a combined state, with a longitudinal direction along the rotation direction, a connecting tool that reaches from at least one side of the concave portion of the concave-convex structure to at least the inside of the convex portion and connects these concave portions and convex portions, And

An example of the connecting tool is a bolt. The coupling tool is provided from the side of the recess, the recess,
The protrusion may be provided so as to penetrate together, or from the side of the recess, may penetrate the protrusion, and may be provided so as to be inserted halfway on the opposite side of the recess, or It may be provided so as to be inserted from the side of the concave part to the middle of the convex part.

According to the third aspect of the present invention, the distal end can be easily attached to the main body only by connecting the distal end and the main body, which can be fitted by an uneven structure, by the connecting means. it can. Further, the distal end portion can be easily detached from the main body simply by removing the connecting tool.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION <First Embodiment>
A first embodiment according to the present invention will be described with reference to FIGS.

FIG. 1 shows an inner peripheral side cutter bit 1 according to the present invention, wherein (a) is a plan view,
FIG. 2B is a front view, FIG. 2C is a side view, and FIG. 2 is a schematic diagram showing a cutting state of the ground by the inner peripheral side cutter bit 1 according to the present invention.

As shown in FIG. 1, a main body 2 of the inner peripheral side cutter bit 1 is provided with a cutter face plate 70 (FIG. 2) of a tunnel excavating device (not shown) such as a shield machine and the like. Are provided for inserting bolts and the like for connecting the two.

The cutting part 4 constituting the right part of the main body 2 in FIG. 1 is a part for cutting the cutting surface of the tunnel. One carbide tip (carbide tip) 5 is provided. A second carbide tip (carbide tip) 6 which is a feature of the present invention is provided on the back side of the cutting section 4 in the rotation direction. That is, both the carbide tip (the first carbide tip 5 and the second carbide tip 6) are provided on the rotation direction side of the cutting portion 4 and on the rear side in the rotation direction of the cutting portion 4.
Is provided.

The inner peripheral side cutter bit 1 is so formed that the end 4a of the cutting portion 4 comes into contact with the cutting surface of the tunnel.
It is provided in the plane of the cutter face plate 70.

According to the inner peripheral side cutter bit 1 according to the present invention, the inner peripheral side cutter bit 1 is provided on both the rotation direction side of the cutting portion 4 and the rear side in the rotation direction of the cutting portion 4. Since the cemented carbide tips (the first cemented carbide tips 5 and the second cemented carbide tips 6) are provided, the wear resistance of the cutting portion 4 can be suitably obtained. Therefore, when the cutter face plate 70 of the tunnel excavating device is rotated to cut the ground by the cutting portion 4, the cutting portion 4 is hardly worn.
Therefore, a decrease in cutting performance can be prevented as much as possible. Further, torque (cutter torque) during rotation of the cutter face plate 70 can be suppressed as low as possible. Further, a decrease in the excavation speed of the tunnel excavation device can be suppressed as much as possible. In addition, the abrasion of the cutting portion 4 in the inner peripheral side cutter bit 1 according to the present invention occurs because the shape of the cutting portion 4 keeps the initial shape, that is, progresses in a similar manner to the initial shape. A decrease in cutting performance can be more suitably prevented.

The data for tunnel excavation using the inner cutter bit 1 according to the present invention will be described below. 682.7 using the inner peripheral side cutter bit 1 according to the present invention.
After excavation of m, when the length A of the carbide tip 4 of the inner peripheral side cutter bit 1 in FIG. 1 is measured, the wear of the carbide tip 4 is suppressed to an average of about 10 to 15 mm. Was. The length A of the carbide tip 4 was initially 40 mm. In addition, the excavated soil had the same soil texture as the data shown in the conventional example, that is, the dirt clay layer and the dip gravel layer having an N value of 50 or more. In other words, despite excavation 1.5 times or more as compared with the conventional example, the wear length is 0.1 mm.
It can be seen that the wear resistance of the cutting part 4 was remarkably improved, being suppressed to about 4 to 0.6 times. In addition, the cutting portion 4
The abrasion shape of the sample kept almost the initial shape.

In the first embodiment described above, the cemented carbide tip is constituted by a first cemented carbide tip and a second cemented carbide tip. It is also possible to use a cemented carbide tip and a second cemented carbide tip that are integrally formed.

<Second Embodiment> A second embodiment according to the present invention will be described below with reference to FIG. FIGS. 3A and 3B show the outer cutter bit 10 according to the present invention, wherein FIG. 3D is a plan view, FIG.
(F) is a sectional view.

Among the components of the outer cutter bit 10, the same components as those of the inner cutter bit 1 are denoted by the same reference numerals, and description thereof is omitted.

The cutting portion 14 constituting the right portion of the main body 12 of the outer peripheral side cutter bit 10 in FIG. 3 is a portion for cutting the outer peripheral portion of the cutting surface of the tunnel. Are provided with first carbide tips (carbide tips) 15a and 15b.
Of these, the first carbide tip 15a is a portion that is closer to the outer periphery than the first carbide tip 15b. As shown in FIG. 3, the first carbide tip 15a and the first carbide tip 1
5b is provided so that the angles of the end portions are different from each other, so that the outer peripheral portion of the cutting surface of the tunnel can be more suitably cut. A second carbide tip (carbide tip) 16 which is a feature of the present invention is provided on the back side in the rotation direction of the cutting portion 14. This second carbide tip 16
Also, the first carbide tip 15a and the first carbide tip 15b
Although it is divided into two parts as in the above, the illustration is omitted. As described above, both the carbide tips (the first carbide tips 15a and 15b, the second carbide tips) are provided on the rotation direction side of the cutting portion 14 and on the back side in the rotation direction of the cutting portion 14. 16) is provided.

The outer peripheral side cutter bit 10 is provided along the periphery of the cutter face plate 70 so that the end 14a of the cutting portion 14 abuts on the outer peripheral portion of the cutting surface of the tunnel.

According to the outer peripheral side cutter bit 10 according to the present invention, the outer peripheral side cutter bit 10
4 on the rotation direction side and on the back side in the rotation direction of the cutting portion 14, both carbide tips (the first carbide tips 15a,
15b, the second carbide tip 16) is provided, so that the wear resistance of the cutting portion 14 is suitably obtained. Therefore, when the cutter face plate 70 of the tunnel excavating device is rotated and the outer peripheral portion of the cutting surface of the tunnel is cut by the cutting portion 14, the cutting portion 14 is less likely to be worn. Therefore, the same effect as the inner peripheral side cutter bit 1 can be obtained.

<Third Embodiment> Hereinafter, a third embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a perspective view (g) showing the inner peripheral side cutter bit 20 according to the present invention, and a side view (h) showing a state where the inner peripheral side cutter bit 20 is divided.

Among the components of the inner peripheral side cutter bit 20, the same components as those of the inner peripheral side cutter bit 1 are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 4, the inner peripheral side cutter bit 20 according to the present invention has through holes (mounting portions) 3,... For attaching the cutter bit 20 to a cutter face plate using bolts or the like. And a tip portion 23 having a cutting portion 4 for cutting the ground.

The main body 22 has a convex portion 2 having a convex side surface.
Four. On the other hand, the tip portion 23 has a concave portion 25 having a concave side surface shape. Insertion holes 26, 27, and 28 are provided in the convex portion 24 and the concave portion 25, respectively, so that a coupling tool such as a bolt (not shown) can be inserted with the convex portion 24 fitted in the concave portion 25. ing. The connection tool allows the main body 22 and the distal end to be detachable. Here, it is desirable that the connecting tool such as a bolt is completely accommodated in the insertion holes 26, 27, and 28 so as not to protrude.

The inner cutter bit 20 according to the present invention
Is provided with the above-described configuration, and only by screwing the coupling tool such as a bolt in a state where the convex portion 24 of the main body 22 is fitted into the concave portion 25 of the distal end portion 23, the main body 2
2 can easily be attached with the tip 23. Also,
The distal end portion 23 can be easily separated from the main body 22 simply by removing the coupling tool. Therefore, only the tip portion 23 can be replaced due to wear of the cutting portion 4, or only the tip portion 23 can be replaced in accordance with a change in the properties of the ground.

In the third embodiment, the convex portion is provided on the main body, and the concave portion is provided on the distal end portion. However, the convex portion is provided on the distal end portion, and the convex portion is provided on the distal end portion. A recess may be provided in the body. Further, in the drawings, the insertion hole is provided so as to penetrate both the convex portion and the concave portion. For example, the connector is inserted from one side of the concave portion to the middle of the convex portion. The connector may be inserted into the recess from one side of the recess and penetrating the recess to a part on the opposite side of the recess. Further, in the third embodiment, the above-mentioned attaching / detaching means is applied to the inner peripheral side cutter bit, but the attaching / detaching means is provided on the outer peripheral side as shown in the second embodiment. Also applicable to cutter bits.

[0039]

According to the cutter bit according to the first aspect of the present invention, the cemented carbide tip is also provided on the back side in the rotation direction of the cutting portion, so that the cutting portion can suitably obtain wear resistance. . Accordingly, when the cutter face plate of the tunnel excavation device is rotated to cut the ground by the cutting portion, the cutting portion is less likely to be worn. Therefore, a decrease in cutting performance can be prevented as much as possible. Further, torque (cutter torque) during rotation of the cutter face plate can be suppressed as low as possible. Further, a decrease in the excavation speed of the tunnel excavation device can be suppressed as much as possible. In addition, the wear of the cutting portion in the cutter bit according to the present invention, while the shape of the cutting portion keeps the initial shape, that is, proceeds in a similar manner to the initial shape, further reduces the cutting performance. It can be suitably prevented.

According to the cutter bit according to the second aspect of the present invention, a tip having a cutting portion, a main body having an attaching portion for attaching the cutter bit to the cutter face plate,
Has a divided structure, so that only the tip portion can be replaced due to wear of the cutting portion, or only the tip portion can be replaced according to a change in the properties of the ground.

According to the cutter bit of the third aspect of the present invention, the distal end portion and the main body, which can be fitted by the concave-convex structure, are simply connected to the main body by the connecting means. Can be easily mounted. Further, the distal end portion can be easily detached from the main body simply by removing the connecting tool.

[Brief description of the drawings]

FIG. 1 shows an inner peripheral side cutter bit according to the present invention, wherein (a) is a plan view, (b) is a front view,
(C) is a side view.

FIG. 2 is a schematic view showing a cutting state of ground by an inner peripheral side cutter bit according to the present invention.

3A and 3B show an outer peripheral side cutter bit according to the present invention, wherein FIG. 3D is a plan view, FIG.
(F) is a sectional view.

FIG. 4 is a perspective view (g) showing the inner peripheral side cutter bit according to the present invention, and a side view (h) of the state where the inner peripheral side cutter bit 20 is divided.

5 shows a conventional inner peripheral side cutter bit 50, in which (i) is a plan view, (j) is a front view,
(K) is a side view.

FIG. 6 shows a conventional outer peripheral side cutter bit, in which (l) is a plan view, (m) is a front view, and (n).
Is a sectional view.

FIG. 7 is a schematic diagram showing a cutting state of a ground by a conventional inner peripheral side cutter bit.

FIG. 8 is a schematic view showing a state of wear of a conventional inner peripheral side cutter bit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutter bit (inner side cutter bit) 2 Main body 3 Mounting part (insertion hole) 4 Cutting part 5 Carbide tip (first carbide tip) 6 Carbide tip (second carbide tip) 10 Cutter bit ( Outer peripheral side cutter bit) 12 Main body 14 Cutting part 15a, 15b Carbide tip (first carbide tip) 16 Carbide tip (second carbide tip) 20 Cutter bit (inner side cutter bit) 22 Main body 23 Tip Part 24 convex part 25 concave part 26,27,28 insertion hole 70 cutter face plate

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 9/08

Claims (3)

(57) [Claims] 1. A cemented carbide tip mounted on a surface orthogonal to a cutting surface of a cutter face plate rotationally driven at a front portion of a tunnel excavation device and substantially covering a rotation direction side of a cutting portion for cutting ground. A cemented carbide tip is also provided on the back side in the rotation direction of the cutting portion, and the end of the back side of the cemented carbide tip in the rotation direction is the carbide in the rotation direction. A cutter bit covered with a chip. 2. A cutter face plate which is driven to rotate in front of a tunnel excavating device, is mounted on a surface orthogonal to a cutting surface, and has a carbide tip in a rotation direction side of a cutting portion for cutting ground. A cutter bit, wherein a tip portion having the cutting portion and a main body having an attachment portion for attaching the cutter bit to the cutter face plate form a divided structure, and the divided structure includes the tip portion. And the main body and the main body can be fitted by an uneven structure, and the concave portion of the uneven structure sandwiches the convex portion of the uneven structure before and after in the rotation direction. Wherein the recess has a substantially constant spacing along the depth direction while having a substantially constant wall thickness along the length of the cutter bit. 3. A cutter face plate rotatably driven at a front portion of a tunnel excavating device is mounted on a surface orthogonal to a cutting surface, and has a carbide tip on a rotation direction side of a cutting portion for cutting ground. A cutter bit, wherein a tip portion having the cutting portion and a main body having an attachment portion for attaching the cutter bit to the cutter face plate form a divided structure, and the divided structure includes the tip portion. And a connecting means for connecting the distal end portion and the main body, wherein the connecting portion fits the distal end portion and the main body. In this state, the connector is a connecting tool that extends from one side of the concave portion of the concave-convex structure to at least the inside of the convex portion and connects these concave portions and convex portions, with the longitudinal direction along the rotation direction, Cutter Bit.