JP2872870B2 - Sealing equipment for shield excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in the technical field of shield excavators, and more particularly to a sealing device between an outer cylinder and an inner cylinder.

[0002]

2. Description of the Related Art A shield excavator has a skin plate, which is in contact with an inner wall surface of an excavated tunnel, and which is slidably guided by an outer cylinder which can advance as the excavation proceeds. And an inner cylinder. A sealing device is provided between the outer cylinder and the inner cylinder to prevent muddy water from entering the inside of the shield excavator.

Conventionally, as shown in FIG. 2 of the accompanying drawings,
The seal device includes a primary seal 3 fixed to a rear end of the outer cylinder 1 and a lip at a tip thereof contacts the inner cylinder 2;
The outer cylinder 1 attached to the outer surface of the inner cylinder 2
And a secondary seal 4 having a lip that contacts an inner surface of the secondary seal.

[0004] The primary seal 3 prevents intrusion of gravel and the like contained in muddy water that fills the outside of the outer cylinder 1 at the rear, and the secondary seal 4 prevents muddy water that intrudes beyond the primary seal 3 from passing through the shield excavator. Prevents intrusion into the interior.

[0005]

The outer cylinder and the inner cylinder repeatedly move relative to each other back and forth. Therefore, the primary seal 3
In addition, the lip of the secondary seal 4 gradually wears, and the sealing effect is reduced. However, the primary seal 3 and the secondary seal 4 are only fixed at fixed positions, and no measures are taken against the wear. Therefore, muddy water enters the inside of the shield machine due to the wear of the seal, which leads to the occurrence of trouble.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sealing device for a shield excavator which can solve such a problem, can easily cope with wear, and can prevent intrusion of muddy water.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an object of the present invention is to provide an outer cylinder which can move in an axial direction in contact with an inner wall surface of a tunnel, and an inner cylinder which is slidably guided by the outer cylinder. A seal member having a lip contacting the inner surface of the outer cylinder and having a tapered inner peripheral surface formed therein, and a taper inner peripheral surface of the seal member. A wedge-shaped member that has a tapered surface that engages with and is supported movably in the axial direction, a pressing member that presses the side surface of the seal member in the axial direction, and the wedge-shaped member and the pressing member with respect to the inner cylinder. And fixing means for fixing at a desired position.

[0008]

In the apparatus of the present invention, the seal member is worn by the lip due to the repeated sliding of the outer tube and the inner tube, and when the amount of wear exceeds an allowable value, the fixing of the fixing means is released. Push in the rear wedge-shaped member. Since the sealing member receives an axial pressing force from the wedge-shaped member on the tapered inner peripheral surface, a radial expansion force having a radially outward component is generated on the tapered inner peripheral surface. By this expanding force, the sealing member expands in diameter, and the lip comes into contact with the outer cylinder with a predetermined contact force. In this state, the positions of the wedge-shaped member and the pressing member are fixed by the fixing member, and that state is maintained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 11 denotes an outer cylinder, which is in contact with a tunnel wall T during excavation. Inside the outer cylinder 11, an inner cylinder 12 is slidably guided by the outer cylinder 1.

At the rear end of the outer cylinder, a ring-shaped primary seal member 13 having a lip on the inner periphery is attached by a fixing ring 13A and a bolt 13B. Contacting with pressure. The primary seal member may be the same as the conventional one, but is preferably an elastic material having excellent wear resistance, such as urethane hard rubber.

The front end of the inner cylinder 12 has a step portion 14 having a smaller outer diameter. A ring-shaped wedge-shaped member 15 is slidably guided in the axial direction on the outer peripheral surface of the step portion 14. I have.
The wedge-shaped member 15 has a tapered surface 16 formed on a rear outer peripheral surface and a flange portion 17 extending radially inward at a front portion. A bolt hole for a bolt 18 is formed in the flange portion 17, and the bolt 18 is screwed into a screw hole of a step portion of the inner cylinder 12. The bolt 18 has a nut 1
9 and 20 are screwed together so that the position of the bolt 18 can be fixed.

On the tapered surface 16 of the wedge-shaped member 15,
Two ring-shaped secondary seal members 21 and 22 are provided. The secondary seal members 21 and 22 are preferably made of an elastic material having excellent wear resistance, like the primary seal member 13 described above, and are made of, for example, urethane hard rubber. A lip having a triangular cross section is formed on the outer periphery of the secondary seal members 21 and 22, and is in contact with the inner surface of the outer cylinder 11. Further, the two secondary seal members 21 and
The inner peripheral surface 2 has a tapered inner peripheral surface that matches the tapered surface 16 of the wedge-shaped member 15.

A ring-shaped pressing member 23 is slidably guided by the cylindrical portion at the front cylindrical portion of the wedge-shaped member 15. The pressing member 23 has a front flange 24 facing radially inward and a rear flange 25 facing radially outward. A bolt hole is formed in the front flange 24, and a bolt 26 passed through the bolt hole is screwed into a screw hole of the wedge-shaped member 15. The bolt 26 has a nut 2
7 and 28 are screwed together so that the position of the bolt 26 can be fixed. On the other hand, the rear flange 24 is in contact with the side surface of the secondary seal member 22.

In this embodiment, the adjustment of the seal member is performed in the following manner.

When the secondary seal members 21 and 22 wear and the amount of wear exceeds an allowable value, first, the nuts 19 and 20 fixing the bolt 18 are loosened, and then the bolt 18 is tightened.

By tightening the bolt 18, the wedge-shaped member 15 moves so as to further enter the tapered inner peripheral surfaces of the secondary seal members 21 and 22, and the secondary seal member 2
1 and 22 are expanded in diameter and come into contact with the inner surface of the outer cylinder 11 at a regular pressure. As the wedge-shaped member 15 moves, the pressing member 23 connected to the wedge-shaped member 15 by the bolt 26 also moves.

Next, the nuts 27 and 28 fixing the bolt 26 are loosened, and the bolt 26 is tightened. Then, the rear flange portion 25 of the pressing member 23 presses the side surfaces of the secondary seal members 21 and 22, and the secondary seal members 21 and 22 are pressed.
Is prevented from expanding laterally due to the force in the radial direction. In this state, the nut 2
The bolts 26 are fixed by tightening the bolts 7 and 28. Thus, the adjustment of the sealing member is completed, and the sealing effect is secured.

The present invention is not limited to the illustrated embodiment, but can be variously modified. For example, it is also possible to provide a plurality of lips as one member instead of a two-member secondary seal member, or to divide the seal member into a plurality of members in the circumferential direction without forming the seal member into an integral ring shape, and to form an inner cylinder. A rib for guiding the circumferential end of the split ring may be provided to guide the split ring in the axial direction. Further, the wedge-shaped member or the pressing member may be similarly divided into a plurality in the circumferential direction.

Further, the pressing member and the fixing means may be, for example, those using a hydraulic cylinder or the like, without being limited to the illustrated example. In this case, if the pressure is always applied, the seal member can be pressed so as to always obtain a constant contact pressure without performing the adjustment each time.

[0021]

As described above, according to the present invention, since the diameter of the seal member is increased by pressing the seal member with the wedge-shaped member, it is possible to easily cope with the wear of the seal member and to improve the work efficiency. In addition, the quick response can surely prevent the intrusion of muddy water, so that the function of the shield excavator is not hindered.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an apparatus according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional device.

[Explanation of symbols]

 Reference Signs List 11 outer cylinder 12 inner cylinder 15 wedge-shaped member 23 pressing member 19, 20, 27, 28 fixing means (nut)

Continued on the front page (72) Inventor Sumio Shoka 1-1-1-13 Yamashita, Okayama City, Okayama Prefecture Inside Omotogumi Co., Ltd. (72) Inventor Hiroshi Toida 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Toshiyuki Matsushita 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Junichi Shibano 1-1-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References Japanese Utility Model Sho 59-147790 (JP, U) Japanese Utility Model Sho 53-74126 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 11/00

Claims (1)

(57) [Claims] 1. An outer cylinder which can move in an axial direction in contact with an inner wall surface of a tunnel, and an inner cylinder which is slidably guided by the outer cylinder, wherein a seal can be provided between the outer cylinder and the inner cylinder. A seal member having a lip that contacts the inner surface of the outer cylinder and having a tapered inner peripheral surface, and a taper surface that engages with the tapered inner peripheral surface of the seal member and is movable in the axial direction. A wedge-shaped member supported by the seal member, a pressing member for pressing the side surface of the seal member in the axial direction, and fixing means for fixing the wedge-shaped member and the pressing member at desired positions with respect to the inner cylinder. Characteristic sealing equipment for shield excavators.