JP3112312B2 - Cutter head with spiral disk cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral disc cutter which is mounted on a cutter head of a tunnel excavator or a small-diameter pipe propulsion machine and excavates a face.

[0002]

2. Description of the Related Art Conventionally, a tunnel excavator for excavating a tunnel and a small-diameter pipe propulsion machine for burying a small-diameter pipe as shown in FIG. Is provided. As shown in FIG. 7, a plurality of disk cutters d are rotatably mounted on the face plate c of the cutter head b in the radial direction, and the cutter head b is rotated while the excavator a is propelled by the propulsion jack e. While each disk cutter d rotates due to friction with the face, the blade f of the disk cutter d bites into the face,
Due to the wedge effect of the blade f, a crack is generated in the face g to excavate the face g.

[0003]

However, the conventional disk cutter d has a structure in which a plurality of blades f are protruded from the outer peripheral surface so as to be concentric in the circumferential direction. A trajectory i composed of a plurality of concentric circles is formed on the face g by the blade f as shown in FIG.
Did not cross each other, and the locus near the center of the cutter head b was a fixed point.

[0004] For this reason, the blade f of the disk cutter d repeats the same place and the excavation efficiency is poor, and the excavation efficiency is significantly reduced depending on the rock to be excavated. Therefore, the pitch and the like of the blade f are designed each time according to the rock. And there were also problems such as lack of versatility. SUMMARY OF THE INVENTION The present invention has been made for the purpose of improving the above disadvantages, and an object of the present invention is to provide a spiral disc cutter for an excavator capable of efficiently excavating a face.

[0005]

According to the present invention, a rotating cutter head is provided at the tip of an excavator for propelling underground, and a disk cutter for excavating a face is provided on a face plate of the cutter head. The disk cutter is rotatably mounted, and the disk cutter is formed by projecting a blade in a spiral shape on the outer peripheral surface of the disk cutter body, and by changing the diameter and arrangement of the cutter as appropriate, the pitch of the trajectory can be reduced. The spiral disk cutter can be made finer, and the plurality of spiral disk cutters are arranged so that their paths intersect.

[0006]

With the above arrangement, the trajectory formed on the face can be determined to be infinitely smaller than the blade pitch by selecting the blade pitch, the mounting position of the cutter head to the face plate, the blade diameter, and the like. . This makes it possible to cope with a wide range of geological rocks, so that the versatility is remarkably improved, and it is not necessary to design each time in accordance with the geology, so that the man-hours required for design and production can be greatly reduced.

Also, with one spiral disk cutter,
Since the trajectory for a plurality of conventional disk cutters can be obtained, it is possible to excavate the entire face with a smaller number than conventional disk cutters, thereby simplifying the mounting structure of the disk cutter and facilitating manufacture. At the same time, since the vicinity of the center of the cutter head can be excavated, there is no uncut portion due to a fixed point, so that the excavator can be propelled with a small propulsive force.

Further, by arranging a plurality of spiral disk cutters so that the trajectories intersect with each other, it is possible to excavate the face while drawing the trajectory in a mesh-like manner, so that efficient excavation becomes possible and the construction period is shortened. I can plan.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 shows a spiral disk cutter in which a blade 2 is projected in a spiral shape on the outer periphery of a disk cutter body 1. A pitch P of the blade 2 and a locus 3 formed on a face are shown.
In this embodiment, the pitch P of the blade 2 is set so that the pitch p of the cutter 2 becomes equal, and the blade 2 is rotatably mounted on a face plate of a cutter head provided at the tip of an excavator (not shown). . FIG. 1 shows that the cutter head is 1
This figure shows the digging trajectory when the spiral disk cutter is set to a diameter and a value so that the spiral disk cutter makes exactly one rotation when it goes around. This indicates that the cutting edge always rolls along the same trajectory.

FIG. 2 shows an excavation trajectory when the spiral disk cutter is set to rotate a plurality of times while the cutter head makes one revolution. In FIG. 1, the pitch of the trajectory becomes coarse, whereas in FIG. Then, the pitch becomes fine.

FIG. 2 shows an embodiment in which the radius of attachment to the face plate, the blade diameter, and the screw pitch are set so that the pitch p of the trajectory 3 formed on the face becomes 1/8 of the pitch P of the blade.

FIG. 3A is attached to the face plate so that the pitch p of the trajectory 3 is set to be 1/2 of the pitch P of the blade 2 and located near the center of the cutter head. . Since the trajectory 3 of the spiral disk cutter shown in FIG. 3A is excavated near the center of the cutter head as shown in FIG. 3B, there is no uncut portion near the center due to a fixed point. . As described above, if the cutting edge is a spiral, the pitch of the trajectory can be made coarse or fine by appropriately changing the diameter and arrangement of the cutter.

FIG. 4 shows an embodiment in which a pair of spiral disk cutters are arranged in a straight line to obtain a net-like trajectory 3. The blades 2 protruding from the outer peripheral surface of each disk cutter body 1 are formed as follows. It is formed to have a reverse screw.

On the other hand, FIG. 5A shows an embodiment of a spiral disk cutter for obtaining an infinitely small locus 3. When the disk cutter body 1 makes one rotation, the locus 3 shown in FIG. With each repetition, the pitch p of the locus 3 becomes fine. And at the 50th rotation, it becomes as shown in FIG.
After a further 150 rotations, an infinitely small trajectory pitch p is obtained as shown in FIG.

In order to obtain the trajectory 3 as in the above embodiment, it is sufficient to select a mounting radius for mounting the spiral disk cutter to the face plate of the cutter head, a blade diameter, and a screw pitch. To infinity smaller than the pitch P width.

[Brief description of the drawings]

FIG. 1 is a front view of a spiral disk cutter according to an embodiment of the present invention, in which an excavation locus in a case where the diameter and arrangement of the spiral disk cutter are set so that the spiral disk cutter makes one rotation when the cutter head makes one rotation; Is shown.

FIG. 2 is a front view showing another embodiment of the spiral disk cutter, showing an excavation trajectory when the spiral disk cutter is set to make a plurality of rotations while the cutter head makes one rotation.

FIG. 3 is a front view showing another embodiment of the spiral disc cutter, showing an excavation locus. (B) It is an operation explanatory view of the disk cutter.

FIG. 4 is a front view showing another embodiment of the spiral disc cutter, showing an excavation trajectory.

FIG. 5 (a) is a front view showing another embodiment of the spiral disk cutter, showing an excavation trajectory. (B) It is an explanatory view of the operation. (C) It is an explanatory view of the operation.

FIG. 6 is a sectional view showing a conventional excavator.

FIG. 7 is a front view of the same.

FIG. 8 is an explanatory view of a conventional small-diameter thruster.

FIG. 9 is a front view of a conventional disk cutter.

FIG. 10 is an explanatory diagram of the operation.

[Explanation of symbols]

 1 disc cutter 2 blade 3 locus

Claims (1)

(57) [Claims] An excavator for propelling underground is provided with a rotating cutter head, and a disk cutter for excavating a face is rotatably mounted on a face plate of the cutter head. It is formed by projecting a blade in a spiral shape on the outer peripheral surface of the cutter body.
Of the locus by appropriately changing the diameter and arrangement of the cutter.
The switch can be made coarse or fine, and
Spiral disc cutters so that the tracks intersect.
Location to the spiral disk cutter of the excavator mounted comprising
Cutter head .