JPH0932482A - Disk cutter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease sliding friction so as to enhance the longevity of a disk cutter device by splitting the disk cutter device from each disk cutter, and enabling each disk cutter to be rotated independently. SOLUTION: Sealing devices are provided between a disk cutter 1 and a bracket 5 and between a disk cutter 2 and the bracket 5. Since each disk cutter is split, a sealing device is also provided between the disk cutters 1, 2. The sealing device is a floating sealing device 7, comprising two O-rings 7a pressed into contact with the disk cutter 1 or 2 and two metallic seal rings 7b, with the seal rings 7b pressed by the elastic forces of the O-rings 7a in the direction of an axis to form sealing surfaces. Floating seals 7 are also provided between the disk cutters 1, 2 and the bracket 5. Therefore, the floating seals 7 can prevent lubricating oil in a bearing 3 from leaking out of the disk cutters.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cutter device having a plurality of disk cutters attached to one shaft attached to a cutter head face plate of a small diameter tube propulsion machine, a TBM, or a shield machine.

[0002]

2. Description of the Related Art FIG. 3 is a front view showing an example of a cutter head provided at the tip of a tunnel machine or a small diameter tube propulsion machine. On the outer edge of the cutter head 20, four disc cutters (tapered) 21 and eight tool bits 22 are movably mounted, and a disc cutter (straight) 23 is provided on the center line of the cutter head 20. , 2
4, 25, 26 are arranged in series. Each of the disc cutters 23 and 26 has three discs, and each of the disc cutters 24 and 25 has two discs. The disk cutter 25 is installed closest to the center of the cutter head 20, and the disk cutter 23 is installed farthest from the center of the cutter head 20.

When the cutter head is rotated during excavation, each disk cutter pressed against the face revolves around the support shaft while revolving by the rotation of the cutter head and crushes gravel together with the tool bit. Since the disk cutters are arranged so that the orbits due to the revolution have different diameters from each other, concentric loci of approximately equal pitch are drawn on the face.

FIG. 4 shows an example of a disk cutter (straight) which has been conventionally used.
It is a fragmentary sectional view of the disk cutter disclosed in Japanese Patent No. 46182. As shown in the figure, two V-shaped apex angle portions are formed on the outer peripheral portion of the integrally formed cutter ring 32, and the bits 31, 31 are formed in the V-shaped apex angle portion.
Has been fixed. As shown in FIGS. 3 and 4, the conventional disc cutter device has a plurality of disc cutters integrally formed. It should be noted that in the case of the cutter head 20 shown in FIG.
The single disk cutter and the disk cutter devices 24 and 25 are formed by integrating two disk cutters.

[0005]

FIG. 5 shows an enlarged view of portion P in FIG. When the cutter head is pressed against the face and rotates, the respective disc cutter devices 25 and 26 rotate and revolve, but even with one disc cutter device 25, the peripheral speed of each disc cutter 25a, 25b is the inner disc cutter 25a, It is the same as the outer disk cutter 25b.
Similarly, the peripheral speeds of the disk cutters 26a, 26b, 26c are also the same. Here, the distance from the center of rotation C of the cutter head to the disc cutter 25a is r1, the distance to the disc cutter 25b is r2, and the disc interval is a, and the length of the circumference of the locus drawn by the disc cutters 25a and 25b by the revolution. Let L1 and L2 respectively be L1 = 2πr1 L2 = 2πr2 = 2π (r1 + a). If the disk cutter device 25 is installed very close to the center of rotation C of the cutter head, the ratio of the disk distance a to r1 becomes large. Therefore, L2 / L
The ratio of 1 also becomes large.

However, since the disc cutter device 25 rotates and revolves integrally, when the cutter head makes one revolution and the disc cutter 25b rolls a distance of 2πr2, the disc cutter 25a also rolls the same distance. There must be. That is, L is the length L1 to be originally rolled.
The length corresponding to 2 must be rolled, and the disc cutter 25a rolls while sliding by the length corresponding to L2-L1. Therefore, the disc cutter 2
Wear of the disc cutter 25a is increased as compared with 5b, which causes uneven wear of the disc cutter device 25.

The same phenomenon occurs in the disk cutter devices 23, 24, and 26 as in the disk cutter device 25. For example, in the disk cutter device 26, the ratio of the distance r4 to the disk cutter 26c to the distance r3 to the disk cutter 26a. r4 / r3 is a disk cutter device 26
Since the mounting position becomes smaller as it goes away from the center C of the cutter head, wear due to slippage of the inner disk 26a tends to decrease.

The present invention has been made in view of the above-mentioned conventional problems, and in a disc cutter device having a plurality of disc cutters, an independently rotatable disc cutter is provided in order to reduce uneven wear of the disc cutter. An object of the present invention is to provide a disc cutter device provided with the device.

[0009]

In order to achieve the above object, a disk cutter device according to the present invention is a disk cutter device mounted on a cutter head face plate of a tunnel machine or a small-diameter pipe propulsion machine. In a cutter head in which a plurality of disc cutters are provided side by side on a support shaft, the plurality of disc cutters are divided for each one, and each is independently rotatably supported by a support shaft via a bearing. There is. A seal device may be provided between the plurality of disc cutters, a labyrinth may be provided, and a retainer may be provided between at least one set between the plurality of disc cutters.
A seal or a seal and a labyrinth may be provided between the disc cutter and the retainer.

[0010]

According to the above construction, in the disc cutter device having a plurality of disc cutters, each disc cutter is divided and each disc cutter rotates independently, so that it is close to the center of rotation of the cutter head. The inner disc cutter does not roll the same rolling distance as the outer disc cutter farther than this. Therefore, the inner disk cutter rolls over the rolling distance corresponding to the distance from the center of rotation of the cutter head without slipping between the inner face and the face.

Further, when the disc cutters are divided and arranged side by side, if a common seal is provided between the adjacent disc cutters, the common seal will allow dirt, muddy water and the like to enter from between the adjacent disc cutters. Prevent. Furthermore,
By providing a labyrinth on the outside of the seal, intrusion of dirt, muddy water or the like into the seal from between the adjacent disk cutters is prevented.

If any retainers having different widths are provided between the independently rotating disk cutters, the intervals between the disk cutters can be arbitrarily changed. If a seal or a seal and a labyrinth are provided between each of the plurality of disk cutters and the bracket device arranged side by side, invasion of earth and sand or muddy water between the disk cutters and the support shaft can be prevented.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a disk cutter device according to the present invention will be described below with reference to the drawings.
FIG. 1 shows a first embodiment of the present invention and is a cross-sectional view of a disk cutter device having two disk cutters. The disc cutter (straight) is divided into a disc cutter 1 and a disc cutter 2, and each is rotatably mounted on a support shaft 4 via a bearing 3. Brackets 5 are attached to both ends of the support shaft 4 by using bolts 6. The disc cutter device is fastened to a cutter head (not shown) by using bolt holes 5a provided in the bracket 5.

Between the disc cutter 1 and the bracket 5,
A sealing device is provided between the disc cutter 2 and the bracket 5 as in the conventional disc cutter. However, in the present invention, the disc cutter is divided for each disc cutter. A sealing device is also provided between the two. These sealing devices are floating seals 7, which are composed of two O-rings 7a and two metal-made seal rings 7b which are pressed against the disc cutter 1 or the disc cutter 2, and the seal ring 7b is made elastic by the O-ring 7a. Is pushed in the axial direction to form a sealing surface. Floating seals 7 are also arranged between the disc cutters 1 and 2 and the bracket 5. These floating seals 7 prevent the lubricant of the bearing 3 from leaking to the outside of the disc cutter, and prevent muddy water and earth and sand from entering the disc cutter.

For the same reason as the above-mentioned sealing device, in addition to the labyrinth 8 provided between the disc cutters 1 and 2 and the bracket 5, the labyrinth 8 is provided also between the disc cutters 1 and 2. These labyrinth 8
Prevents muddy water and sediment from entering the disk cutter.

Since the disk cutter device is divided for each disk cutter, if the present invention is applied to the disk cutter 25 shown in FIGS. 3 and 5, for example, when the cutter head makes one rotation, the center of rotation of the cutter head will be the same. The rolling distance of the near disk cutter 25a becomes 2πr1 and the problem of slippage caused by the rolling of the disk cutter 25b is solved. Therefore, it is desirable that at least the disc cutter device 25 and the disc cutter device 24 are disc cutter devices provided with independently rotatable disc cutters. Further, since the present disk cutter device is provided with the common sealing device and labyrinth device between the adjacent disk cutters, dirt, muddy water and the like do not enter between the disk cutters.

In this embodiment, the disk cutter device having two disk cutters has been described. However, a disk cutter device having three or more disk cutters, or a disk cutter having a cemented carbide tip attached to the outer edge of the disk cutter. The device can have the same structure as in FIG.

FIG. 2 shows a second embodiment of the present invention and is a sectional view of a disc cutter device in which a retainer is mounted between two disc cutters. Disc cutter (straight)
Has a disc cutter 11 and a disc cutter 12 which are independent of each other, and are rotatably mounted on a support shaft 14 via bearings 13. The disc cutter 11, 1
2 is fitted to the rotary rings 11b and 12b, and the retaining rings 11c and 12c are attached to one end surface of the cutter rings 11a and 12a.
The a and 12a and the rotating rings 11b and 12b may be integrated. Brackets 15 are provided at both ends of the support shaft 14.
Is detachably attached to the disk cutters 11 and 12
A retainer 16 having a function of a spacer that adjusts the distance between the cutter rings 11a and 12a is mounted between them.
The retainer 16 is sandwiched between two bearings 13, 13 adjacent to each other.

Since the retainer 16 is mounted between the disc cutters 11 and 12, floating seals 17 are provided as a sealing device between the disc cutter 11 and the retainer 16 and between the disc cutter 12 and the retainer 16, respectively. There is. Further, between the disc cutter 11 and the retainer 16 and between the disc cutter 12 and the retainer 1.
A labyrinth 18 is provided between each of them.

In this way, the independent disk cutter 1
With the structure in which the retainer 16 is sandwiched between 1 and 12 and arranged in parallel with the support shaft 14, the distance between the disc cutters 11 and 12 can be adjusted to a desired value by changing the axial length of the retainer 16. . Further, when the structure as in this embodiment is used, as compared with the case where a plurality of disk cutters 11 and 12 are independently arranged side by side, the disk cutters 11 and 12 are arranged in parallel.
It is possible to obtain a disk cutter device capable of precisely adjusting 12 intervals.

[0021]

As described above, according to the present invention, the following effects can be obtained. (1) A disk cutter device having a plurality of disk cutters is divided for each disk cutter, and each disk cutter can rotate independently. Therefore, in the conventional disk cutter device having an integrated structure of a plurality of disk cutters, The problem of sliding wear that has occurred in the inner disk cutter near the center of rotation is resolved, and the useful life of the disk cutter can be extended. (2) Since the shared seal is provided between the divided disc cutters, the increase in the axial length due to the division of the disc cutters can be minimized. (3) By providing a labyrinth on the outside of the seal,
It is possible to reduce intrusion of earth and sand and muddy water into the seal. (4) By providing a retainer having a spacer function between the independently rotating disc cutters and changing the axial length thereof, a disc cutter device having a desired disc cutter interval can be obtained. The disc cutter device having such a structure can be a disc cutter device capable of finely adjusting the disc cutter interval rather than arranging independent disc cutter devices configured for each disc cutter in series. Further, the disk cutter device can be shared.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a disk cutter device according to a second embodiment of the present invention.

FIG. 3 is a front view showing an example of a cutter head.

FIG. 4 is a partial cross-sectional view showing an example of a conventional disk cutter.

5 is an enlarged view of a P portion of FIG.

[Explanation of symbols]

1, 2, 11, 12, 25a, 25b, 26a, 26
b, 26c Disc cutter 3 Bearing 4,14 Support shaft 5,15 Bracket 6 Bolt 7,17 Floating seal 8,18 Labyrinth 11a, 12a Cutter ring 11b, 12b Rotation ring 11c, 12c Detent ring 16 Bracket 20 Cutter head 23, 24, 25, 26 disk cutter device

Claims (5)

[Claims] 1. A disk cutter device mounted on a cutter head face plate of a tunnel machine or a small diameter pipe propulsion machine, wherein the plurality of disk cutters are provided side by side on a disk cutter support shaft. The disk cutter is divided into pieces, each of which is independently rotatably supported by a support shaft through a bearing. 2. The disk cutter device according to claim 1, wherein a seal device is provided between the plurality of disk cutters. 3. The disc cutter device according to claim 1, wherein a labyrinth is provided between the plurality of disc cutters. 4. The disc cutter device according to claim 1, wherein a retainer is provided between at least one set between the plurality of disc cutters. 5. The disc cutter device according to claim 4, wherein a seal or a seal and a labyrinth are provided between the disc cutter and the retainer.