JPH1122386A - Disc cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage of a blade edge by providing a groove for slip stop for soil and mountain on the outer peripheral part of the cutter ring of a disc cutter. SOLUTION: With regard to a disc cutter provided on the front face of a cutter head, a plurality of grooves 9 are formed on the blade edge part of the outer peripheral part of a cutter ring 7 at substantially regular intervals. The groove 9 is made a shape, for example, cut in the form of a U-shape, and the size, depth and pitch are set on proper values by properties of an excavating cutting face. Next, in the case where a soft rock is excavated, occurrence of malfunction in which force for rotating the cutter ring 7 and the cutting face by generating slippage between the cutter ring 7 and the cutting face is not obtained from a cutting face since the groove 9 is a slip stop. In addition, a recess-like groove is provided on the side of the cutter ring at need. As a result the early stage wear of the blade edge can be prevented, and life of the disc cutter can be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cutter provided on the front of a cutter head.

[0002]

2. Description of the Related Art Generally, in a tunnel excavator, a cutter head is rotatably mounted on a front portion of a shield body, and a number of disk cutters are rotatably mounted on a front surface of the cutter head. The front face is excavated by rotating the disk cutter with the rotation of the head.

By the way, as shown in FIG. 7, the most common shape of the disk cutter is a structure provided with a circular or spiral cutting ring 51 having a smooth outer periphery. Further, as shown in FIG. 8, a so-called gear cutter in which a blade portion 52 is formed along a plurality of surfaces including a support shaft is also known (for example, Japanese Patent Laid-Open No. 5-33587, Japanese Utility Model Application Laid-Open No. No. 4-122798).

[0004]

However, in the above-mentioned disk cutter having a smooth circular or spiral cutting, a slip occurs between the cutting and the face when excavating soft rock. There is a problem in that a force for rotating the ring cannot be obtained from the face, and the cutter ring needs to be replaced in a short period of time due to uneven wear of the cutting edge due to non-rotation. On the other hand, in the above-described gear cutter, since the shape of the blade portion is discontinuous and the shape of the cutting edge is sharp, the cutting edge cannot be continuously cut into the face face, resulting in poor crushing property. There is a problem that the cutting edge is easily damaged or worn.

The present invention has been made in view of the above problems, and in particular, a disk cutter capable of eliminating uneven wear of a cutting edge when excavating a soft rock layer and preventing early wear and breakage of the cutting edge. The purpose is to provide.

[0006]

In order to achieve the above-mentioned object, a disk cutter according to the present invention comprises a disk cutter provided on a front surface of a cutter head, which is provided on an outer peripheral portion of a cutter ring with respect to ground. It is characterized by providing a groove for preventing slippage.

In the present invention, since the non-slip groove is provided on the outer peripheral portion of the cutter ring, the groove on the outer peripheral portion is caught by the cutting face even if the cutter tries to slide when excavating soft rock. The slip is prevented, and it is possible to prevent the occurrence of a situation in which the cutter cannot obtain the rotational force from the face. Thus, early wear based on uneven wear of the cutting edge can be prevented, and the life of the disk cutter can be extended. Here, it is preferable that the pitch, depth, cutting edge angle and the like of the grooves provided on the outer peripheral portion are set to optimal values according to the strength of the soft rock.

In the present invention, the groove may be provided on a cutting edge of the cutter or on a side surface of the cutter.

[0009]

Next, a specific embodiment of a disk cutter according to the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a disk cutter according to an embodiment of the present invention, FIG. 2 is a side view of the disk cutter, and FIG.
FIG. 2 is a partial perspective view showing a cutter ring in the disk cutter in a partial cross section.

In the disk cutter 1 of the present embodiment,
A support shaft 3 is fixed to bearing brackets 2, 2 attached to a cutter head (not shown) by bolts 4, 4, and hub portions 6 around the support shaft 3 via bearings 5, 5.
Are rotatably supported. In this embodiment, 2
Each of the cutter rings 7, 7 is attached. Also,
Outside the both sides of the bearings 5, 5, floating seals 8, which are located between the hub 6 and the bearing brackets 2, 2 and elastically support the seal ring 8b with the O-ring 8a, are inserted. The lubricating oil is sealed in the internal space sealed by the floating seals 8 on both sides.

The cutter ring 7 has a plurality of grooves 9 at substantially equal intervals in a cutting edge portion on an outer peripheral portion. The groove 9 has a shape in which a blade portion is cut out in a U-shape, and its size, depth and pitch are set to optimal values according to the properties of the face to be excavated.

With such a configuration, the groove 9 formed in the cutter ring 7 serves as a slip stopper when soft rock is excavated using the disk cutter 1 in particular. Therefore, unlike the conventional disk cutter having no groove 9, slippage occurs between the cutter ring 7 and the face, and a problem that a force for rotating the cutter ring 7 cannot be obtained from the face is generated. Can be prevented. In this way, early wear of the cutting edge can be prevented,
It is possible to extend the life of the disk cutter.

FIG. 4 shows the shape of the blade portion of a disk cutter according to another embodiment of the present invention. In this embodiment, the shape of the groove 9 'provided in the cutter ring 7A is such that the blade portion is cut out in a V-shape. Thus, various shapes can be selected as the shape of the groove.

FIGS. 5 and 6 show examples in which grooves (recesses) 10 and 10 'are provided on the side surfaces of the cutter rings 7B and 7C, respectively. Here, FIG. 5 shows an example in which a groove 10 is provided so as to scrape off a portion near the cutting edge, and FIG. 6 shows an example in which a cylindrical groove 10 ′ is provided in a slope portion. As in these examples,
Even if the groove is provided not only at the cutting edge portion of the cutting but also on the side surface, the same operation and effect as in the above-described embodiment can be obtained. This groove can also be provided on both the cutting edge and the side surface of the cutter ring.

In any of these embodiments, it is preferable that the size, depth and pitch of the groove are set to optimal values according to the properties of the face to be excavated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a disk cutter according to an embodiment of the present invention.

FIG. 2 is a side view of the disk cutter of the embodiment.

FIG. 3 is a partial perspective view showing a cutter ring in a partial cross section in the disk cutter of the present embodiment.

FIG. 4 is a view showing the shape of a blade portion of a disk cutter according to another embodiment of the present invention.

FIG. 5 is a diagram showing still another embodiment of the present invention.

FIG. 6 is a diagram showing still another embodiment of the present invention.

FIG. 7 is a diagram showing a conventional disk cutter having a circular cutter ring.

FIG. 8 is a diagram showing a conventional gear cutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc cutter 2 Bearing bracket 3 Support shaft 4 Bolt 5 Bearing 6 Hub part 7, 7A, 7B, 7C Cutting 8 Floating seal 9, 9 ', 10, 10' Groove

Claims (3)

[Claims] 1. A disk cutter provided on a front surface of a cutter head, wherein a groove for preventing slippage with respect to ground is provided on an outer peripheral portion of the cutter ring. 2. The disk cutter according to claim 1, wherein the groove is provided at a cutting edge of the cutter ring. 3. The disk cutter according to claim 1, wherein the groove is provided on a side surface of the cutter ring.