JP3758816B2 - Disc cutter device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc cutter device, and more particularly to a disc cutter device provided on the front surface of a cutter head so that the allowance can be adjusted.
[0002]
[Prior art]
Generally, in a tunnel excavator, a cutter head is rotatably attached to the front part of a shield body, and a large number of disk cutters are rotatably attached to the front surface of the cutter head. As the cutter head rotates, As the disc cutter rotates, the front face is excavated.
[0003]
By the way, this type of tunnel excavator is provided with a feed allowance adjustment mechanism that adjusts the allowance of the disc cutter provided on the outer peripheral side of the cutter head, and when extra excavation is required as in curved construction. The turn allowance adjustment mechanism increases the allowance of the disc cutter. Conventionally, the adjustment of the allowance has been performed by manually adjusting the shim after an operator enters the chamber. For this reason, there are problems that work is dangerous and work efficiency is extremely poor.
[0004]
Various proposals have been made in the past to make it easy to adjust the allowance of the disc cutter. For example, in Japanese Utility Model Laid-Open No. 5-27197, as shown in FIG. 8, a cutter case 52 to which a copy disc cutter assembly 51 is attached is moved by four hydraulic jacks 53. Has been. Further, for example, in Japanese Patent Application Laid-Open No. 8-193494, as shown in FIG. 9, a disc cutter 61 is directly and rotatably supported on the distal end of a telescopic rod 63 of a jack 62. Yes.
[0005]
[Problems to be solved by the invention]
However, in the former publication (Japanese Utility Model Publication No. 5-27197), since the cutter case is moved by four hydraulic jacks, all the hydraulic jacks are moved in synchronization. There is a problem in that galling occurs when this synchronization operation is not successful.
[0006]
On the other hand, in the latter publication (Japanese Patent Laid-Open No. 8-193494), since the disk cutter is moved by one jack, the above-mentioned problems regarding the synchronization operation are solved. Although it is possible, the length in the longitudinal direction including the disc cutter and jack becomes extremely long, and it jumps out into the cutter head chamber and interferes with the screw conveyor installed in the chamber. There is a point. In particular, this latter adjustment mechanism should be applied to tunnel excavators with an outer diameter of less than 3 m (for example, small-diameter semi-shields and shield machines) due to the problem of interference with other members in the machine. I can't.
[0007]
The present invention has been made to solve such a problem, and is a disc cutter that can be mounted on a small-diameter tunnel excavator without using a plurality of jacks and having a very compact structure. The object is to provide an apparatus.
[0008]
[Means for solving the problems and actions / effects]
In order to achieve the foregoing object, a disc cutter device according to the present invention comprises:
In the disc cutter device provided on the front surface of the cutter head,
(A) Disc cutter body,
(B) a pedestal having a substantially cylindrical outer peripheral surface to which the disc cutter body is attached;
(C) a holder provided on the outer peripheral portion of the pedestal and supporting the pedestal so as to be slidable in the axial direction; and (d) in a chamber formed between the outer peripheral surface of the pedestal and the inner peripheral surface of the holder. A hydraulic supply means is provided for supplying hydraulic pressure to slide the pedestal with respect to the holder.
[0009]
In the present invention, a pedestal having a substantially cylindrical outer peripheral surface is disposed along the inner peripheral surface of the holder, and the disc cutter body is attached to the pedestal, and between the outer peripheral surface of the pedestal and the inner peripheral surface of the holder. The hydraulic pressure is supplied into the chamber formed by the hydraulic pressure supply means, whereby the pedestal is slid in the axial direction with respect to the holder. In this way, the pedestal that supports the disc cutter main body is used as a piston, and the holder is used as a cylinder to adjust the allowance of the disc cutter main body. Therefore, the jack as the allowance adjustment mechanism jumps into the cutter head chamber. Compared to the conventional structure, the structure can be made extremely compact and can be mounted on a small-diameter tunnel excavator. In addition, since it is not necessary to provide a plurality of jacks with respect to one disc cutter body, smooth insertion and removal is possible without causing problems such as galling when the disc cutter body is put in and out. Furthermore, according to the present invention, since there is no obstructing member such as a jack on the inside of the disc cutter main body, the disc cutter main body can be easily attached and detached.
[0010]
In the present invention, it is preferable that a detent means for preventing the pedestal from rotating in a plane orthogonal to the axis of the holder is provided. By providing such a detent means, the pedestal, in other words, the disc cutter main body can be firmly fixed to the holder, and it is ensured that the disc cutter main body moves inadvertently with respect to the holder. Can be prevented.
[0011]
The disc cutter main body is assembled to the pedestal, and the pedestal is assembled to the holder so that the disc cutter main body, the pedestal and the holder are integrated, and the integrated assembly penetrates the holder. It is preferable that the structure is attached to the cutter head by a bolt. According to such a structure, the disc cutter main body, the pedestal, and the holder can be attached to the cutter head in a sub-assembled state in advance, so that the operation of attaching the disc cutter device to the cutter head can be greatly simplified. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the disk cutter device according to the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a longitudinal sectional view of a shield machine equipped with a disk cutter device according to an embodiment of the present invention, and FIG. 2 is a front view of the shield machine.
[0014]
In the shield machine 1 of the present embodiment, a cutter head support 3 is fixed to the front portion of the shield body 2, and a cutter head 5 is rotatably supported on the cutter head support 3 via a bearing 4. A large number of disk cutter devices 6 are arranged on the front surface of the cutter head 5. A partition wall 7 is fixed to the shield body 2, and a chamber 8 for taking in excavated earth and sand is defined between the partition wall 7 and the cutter head 5.
[0015]
Among the disk cutter devices 6, the disk cutter device 6 provided on the outer peripheral side of the cutter head 5 (in this embodiment, three disk cutter devices indicated by reference numerals 6A, 6B, and 6C in FIG. 2) has an output allowance. An adjustment mechanism (lifting mechanism) 9 is provided. Hereinafter, the detailed structure of the allowance adjusting mechanism 9 will be described with reference to FIG. 3 (sectional view of the disk cutter device), FIG. 4 (viewed from the arrow A in FIG. 3), and FIG. While explaining.
[0016]
The allowance adjustment mechanism 9 has a structure including a pedestal 11 on which the disc cutter main body 10 is supported, and a holder 12 provided on the outer periphery of the pedestal 11. The pedestal 11 has a plurality of (four in this embodiment) receiving seats 11a projecting toward the center on the inner peripheral surface, and the disc cutter is provided on these receiving seats 11a. The main body 10 is placed and fixed with bolts 13 from below. On the other hand, the holder 12 is arranged so as to be in sliding contact with the outer peripheral surface of the pedestal 11, and is fixed to the cutter head 5 by a plurality of (16 in this embodiment) bolts 14 penetrating the holder 12. The members of the holder 12 are fixed to each other by four bolts 15.
[0017]
Spline teeth 16 are provided on the outer peripheral surface of the pedestal 11, and the spline teeth 16 are fitted into the grooves on the inner peripheral surface of the holder 12, so that the pedestal 11 can be prevented from rotating with respect to the holder 12 with a small surface pressure. Has been. The holder 12 is formed with two systems of oil passages 17 and 18, and the respective oil passages 17 and 18 are opened to chambers 19 and 20 formed on the sliding surface of the base 11 and the holder 12, respectively. With the holder 12 as a cylinder and the pedestal 11 as a piston, the pedestal 11, in other words, the disc cutter main body 10 can be moved in the front-rear direction (arrow B-C direction in FIG. 5) with respect to the holder 12. A piston seal 21 and U packings 22 and 23 as oil seals, and U packings 24 and 25 as dust seals are interposed on the sliding contact surfaces of the holder 12 and the base 11. Further, O-rings 26 and 27 are interposed between the members constituting the holder 12.
[0018]
In the disk cutter device 6 configured as described above, the hydraulic pressure is supplied to the chamber 19 through the oil passage 18 during normal digging, so that the pedestal 11 (disc cutter body 10) is in contact with the holder 12. It is in a contracted position (position indicated by a solid line in FIG. 3). In this state, by moving the shield main body 2 forward while rotating the cutter head 5, the front face is excavated by the disc cutter main body 10 of the disc cutter device 6, and excavated earth and sand is taken into the chamber 8 and screw conveyor 28. Is carried out backward.
[0019]
Next, when extra digging is required as in curve construction, hydraulic pressure is supplied into the chamber 20 through the oil passage 17 from a hydraulic supply means (not shown). As a result, the pedestal 11, in other words, the disc cutter body 10 is advanced by the raised amount δ with respect to the holder 12, and an excessive amount of excavation necessary for curve construction is easily ensured. In this case, setting each of the three disk cutter devices 6A, 6B, and 6C shown in FIG. 2 so as to increase in size sequentially along the rotation direction of the cutter head 5 makes it possible to dig more smoothly. Preferred above.
[0020]
In this embodiment, when assembling the disc cutter device 6 to the cutter head 5, the disc cutter body 10 is first fixed to the pedestal 11 with the bolts 13, and the pedestal 11 is assembled to the holder 12. 10. The pedestal 11 and the holder 12 are integrated with a bolt 15 and the integrated assembly is attached to the cutter head 5 with a bolt 14 provided so as to penetrate the holder 12. By doing so, the disc cutter main body 10, the pedestal 11 and the holder 12 can be attached to the cutter head 5 in a pre-assembled state, and the complicated work of directly attaching the constituent members of the disc cutter at the site is eliminated. Thus, the work of attaching the disk cutter device 6 to the cutter head 5 can be greatly simplified.
[0021]
When only the disc cutter main body 10 is to be replaced, the bolt 13 fixing the disc cutter main body 10 can be easily removed to the front side of the cutter head 5, and the bolt 13 can be removed. In this state, the disc cutter main body 10 can be easily removed from the inside of the machine by turning 90 °.
[0022]
As described above, according to the present embodiment, since the base 11 that supports the disc cutter body 10 is a piston and the holder 12 is a cylinder, the allowance of the disc cutter body 10 is adjusted. Compared to the conventional structure in which the jack as the adjusting mechanism jumps into the cutter head chamber, the structure can be made extremely compact. Therefore, it is possible to obtain a disk cutter device suitable for application to a small-diameter tunnel excavator. In addition, since it is not necessary to provide a plurality of jacks for one disc cutter body 10, it is possible to avoid the occurrence of problems such as galling that occur when the plurality of jacks cannot be operated synchronously. Further, the disc cutter main body 10 has an advantage that what is conventionally used can be used as it is.
[0023]
6 and 7 show a disk cutter device according to another embodiment of the present invention.
[0024]
In the previous embodiment, the structure using spline fitting has been described as the detent structure of the pedestal 11 with respect to the holder 12. However, in this embodiment, the bottom view of the pedestal 11 is recessed inward at the lower part of the outer peripheral surface. A rectangular step portion 11 b is formed, and an octagonal detent plate 29 is fixed to the lower surface of the holder 12 with a bolt 30 so as to be fitted to the step portion 11 b. Other than this, there is no fundamental difference from the previous embodiment. Therefore, the same reference numerals are assigned to the parts common to the previous embodiment, and the detailed description thereof is omitted.
[0025]
Also according to the structure of the present embodiment, the same operational effects as the previous embodiment can be obtained. In the present embodiment, the shape of the rotation stopper plate 29 is not limited to an octagon, and may be another polygon.
[0026]
The rotation prevention structure of the pedestal 11 with respect to the holder 12 can be variously modified in addition to the above-described spline fitting, a polygonal plate, and a key-key groove fitting.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a shield machine equipped with a disk cutter device according to an embodiment of the present invention.
FIG. 2 is a front view of the shield machine according to the present embodiment.
FIG. 3 is a cross-sectional view of the disk cutter device of the present embodiment.
FIG. 4 is a view taken in the direction of arrow A in FIG. 3;
FIG. 5 is an enlarged view of a main part of FIG. 3;
FIG. 6 is a cross-sectional view of a disk cutter device according to another embodiment of the present invention.
FIG. 7 is a view taken in the direction of arrow A in FIG.
FIG. 8 is a diagram showing a conventional disk cutter device.
FIG. 9 is a diagram showing another conventional disk cutter device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield machine 2 Shield main body 3 Cutter head support 4 Bearing 5 Cutter head 6, 6A, 6B, 6C Disc cutter device 7 Bulkhead 8 Chamber 9 Protrusion adjustment mechanism (lifting mechanism)
10 Disc Cutter Body 11 Base 11a Receiving Seat 12 Holder 13, 14, 15 Bolt 16 Spline Teeth 17, 18 Oil Path 19, 20 Chamber 21 Piston Seal 22, 23, 24, 25 U Packing 26, 27 O Ring 28 Screw Conveyor 29 Non-rotating plate 30 bolt

Claims (3)

In the disc cutter device provided on the front surface of the cutter head,
(A) Disc cutter body,
(B) a pedestal having a substantially cylindrical outer peripheral surface to which the disc cutter body is attached;
(C) a holder provided on the outer peripheral portion of the pedestal and supporting the pedestal so as to be slidable in the axial direction; and (d) in a chamber formed between the outer peripheral surface of the pedestal and the inner peripheral surface of the holder. A disc cutter apparatus comprising hydraulic pressure supply means for supplying hydraulic pressure to slide the pedestal relative to the holder. 2. The disk cutter device according to claim 1, further comprising a detent means for preventing the pedestal from rotating relative to the holder in a plane perpendicular to the axis thereof. The disc cutter main body is assembled to the pedestal, and the pedestal is assembled to the holder, and the disc cutter main body, the pedestal and the holder are integrated. The disk cutter device according to claim 1, wherein the disk cutter device is configured to be attached to the cutter head.

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