JPH04158Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention is based on a sharp curve excavation type shield excavator in which the excavation cutter can be slid in a direction perpendicular to the excavation direction. The present invention relates to a sealing device for sealing between spaces.

[Conventional technology] In order to enable tunnel construction with sharp curves,
As shown in FIG. 4, an eccentric cutter type shield excavator has been proposed in which an excavation cutter b is slidably provided on a cylindrical shield frame a in a direction orthogonal to the axis of the shield frame a. 1978
−213995). This excavator is constructed by slidably fitting a slide block d provided on a bearing boss c of a cutter b into a slide groove e provided in a shield frame a. In order to prevent earth and sand water on the face side from entering the excavator through the space between the slide groove e and the slide block d, the face side wall surface of the plate material forming the slide groove e is connected to the fixed side water stop wall. f, and an annular sliding-side water-stopping wall h having a lip seal g in sliding contact with the fixed-side water-stopping wall f on the outer periphery of the bearing boss c.
is provided.

[Problems to be solved by the invention] However, since there is a gap on the sliding surface between the slide groove e and the slide block d to enable sliding, the bearing boss is There was a problem in that the part c was inclined, causing the lip seal g of the sliding side water stop wall h to rise above the fixed side water stop wall f surface, making sealing impossible.

Therefore, the present invention has been devised to effectively solve the above-mentioned problems of the conventional technology.Even if the bearing boss section is inclined, the sealing between the fixed side water stop wall and the sliding side water stop wall is maintained. An object of the present invention is to provide an eccentric part sealing device for a cutter eccentric type shield excavator, which can secure the following properties.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a bearing boss portion of an excavation cutter that is slidably attached to the axial center portion of the cylindrical shield frame in a direction orthogonal to the axial center line. In the cutter eccentric type shield excavator equipped with
An annular fixed-side water-stopping wall is formed on the shield frame along the inner circumferential wall thereof, and an annular sliding plate is provided on the outer periphery of the bearing boss portion to slide on the fixed-side water-stopping wall in a liquid-tight manner. An annular sliding-side water-stopping wall is formed, and the sliding-side waterstopping wall is provided with a pressing means for pressing the sliding plate onto the fixed-side waterstopping wall, and the sliding-side waterstopping wall and the sliding plate are connected to each other. A flexible sealing member is provided to seal the space between the two.

[Function] Since the sliding plate that seals between the fixed side water stop wall and the sliding side water stop wall is always in close contact with the fixed side water stop wall by the pressing means, even if the bearing boss section is tilted, Even if the sliding-side water-stop wall becomes separated from the fixed-side water-stop wall, the sealing performance between the fixed-side water-stop wall and the sliding-side water-stop wall is ensured.

[Embodiment] A preferred embodiment of the present invention will be described below in detail with reference to FIGS. 1 to 3.

In the figure, 1 is a cylindrical shield frame, 2
is an excavation cutter provided at one end of the shield frame 1. One end of a rotating shaft 3 is fixed to the center of the cutter 2, and the rotating shaft 3 is rotatably supported by a cylindrical bearing boss 4 surrounding the rotating shaft 3. A gear 5 is attached to the rear end of the rotating shaft 3 protruding from the bearing boss 4, and this gear 5 meshes with a gear 8 of a motor 7 attached to the rear end of the bearing boss 4 via a bracket 6. has been done.

A rectangular slide block 9 is fixed to the outer periphery of the bearing boss 4 in order to support the bearing boss 4 slidably in a direction perpendicular to the axis of the shield frame 1, particularly in the left and right directions. A slide groove 10 is formed in the shield frame 1 to slidably engage the slide block 9. This slide groove 10 is made up of annular plates 11 and 12 provided in parallel at a predetermined interval within the shield frame 1, and a partition plate 13 provided astride between these plates 11 and 12. The plate material 11 on the face side constitutes a fixed side water stop wall 14. The slide block 9 is slid from side to side along a slide groove 10 by a cylinder 15.

On the other hand, an annular sliding-side water-stop wall 16 facing the fixed-side water-stop wall 14 is fixed to the outer circumference of the bearing boss 4, and a fixed-side water-stop wall 16 is fixed to the outer periphery of the sliding-side water stop wall 16. An annular sliding plate 17 that slides in liquid-tight contact with the water wall 14 is attached via a flexible seal member 18 and a coil spring 19 serving as a pressing means. The sliding plate 17 is located between the sliding-side water-stopping wall 16 and the fixed-side water-stopping wall 11, and has a flange portion 20 surrounding the outer peripheral edge of the sliding-side waterstop wall 16. A sealing member 18 made of an annular rubber plate is attached to straddle between the portion 20 and the outer peripheral edge of the sliding water stop wall 16.

A circumferentially continuous protrusion 21 that swingably presses the sliding plate 17 is formed on the outer peripheral edge of the sliding water stop wall 16 . In addition, recesses 22 and 23 for accommodating the coil spring 19 are formed facing each other in portions of the sliding side water stop wall 16 and the sliding plate 17 that are located inside the protrusion 21. 2
A coil spring 19 is fitted between 2 and 23 in a compressed state for pressing the sliding plate 17 against the fixed water stop wall 14. Note that a plurality of coil springs 19 are arranged at appropriate intervals in the circumferential direction of the sliding plate 17.

An annular sealing member 24 is attached to the sliding surface of the sliding plate 17 that contacts the fixed water stop wall 14 along its circumferential direction. This seal member 24 includes a plurality of lip seals 25 and these lip seals 25.
It consists of plate-shaped bearings (thrust bushes) 26 placed on the inside and outside of the cylinder, and a dust seal 27 placed on the outermost side. Note that 28 is a dust seal cover, and 29 is an oil supply pipe for supplying lubricating oil to the sliding surface of the sliding plate 17 for both sealing and lubrication.

In the above configuration, when the bearing boss portion 4 is slid to make the cutter 2 eccentric, the sliding plate 17 slides on the fixed side water stop wall 14 accordingly.
In addition, if the bearing boss portion 4 is inclined due to the gap between the sliding surfaces of the slide block 9 and the slide groove 10, the sliding side water stop wall 16 and the fixed side water stop wall 14 will However, since the sliding plate 17 is pressed onto the fixed water stop wall 14 by the coil spring 19, there is no gap between them. Therefore, the space between the sliding side water stop wall 16 and the sliding plate 17 is sealed by the flexible seal member 18, and the space between the sliding side water stop wall 17 and the fixed side water stop wall 14 is sealed. Since they are in close contact, a sufficient seal can be ensured between the sliding-side water-stopping wall 16 and the stationary-side waterstopping wall 14, and intrusion of sand and water into the face can be reliably prevented.

[Effects of the invention] In summary, according to the invention, the sliding plate that slides into contact with the fixed-side water-stop wall formed on the shield frame and the sliding-side water-stop wall formed on the bearing boss portion of the excavation cutter. A flexible sealing member is used to seal between the sliding plate and the fixed-side water-stopping wall, and the sliding plate is brought into close contact with the fixed-side waterstopping wall by a pressing means to seal between the sliding plate and the fixed-side waterstopping wall. An excellent effect is that even if the bearing boss section is tilted and there is a gap between the sliding side water stop wall and the fixed side water stop wall, sufficient sealing performance can be maintained between them. demonstrate.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing one embodiment of the present invention;
The drawings are an enlarged view of part A in FIG. 1, FIG. 3 is a sectional view taken along the line B--B in FIG. 1, and FIG. 4 is a schematic sectional view showing a conventional sealing device. In the figure, 1 is a shield frame, 2 is an excavation cutter, 4 is a bearing boss part, 14 is a fixed side water stop wall, 1
Reference numeral 6 is a sliding side water stop wall, 17 is a sliding plate, 18 is a sealing member, and 19 is a coil spring (pressing means).

Claims (1)

[Scope of utility model registration request] In a cutter eccentric type shield excavator, in which a bearing boss of an excavation cutter is provided on the axis of a cylindrical shield frame in a direction perpendicular to the axis thereof, the bearing boss of the excavation cutter is provided on the axis of the shield frame. An annular fixed-side water-stop wall is formed, and an annular sliding-side water-stop wall is formed on the outer periphery of the bearing boss portion, and has an annular sliding plate that slides in liquid-tight contact on the fixed-side water-stop wall. and a flexible sealing member that provides a pressing means for pressing the sliding plate onto the fixed side water stop wall on the sliding side water stop wall and seals between the sliding side water stop wall and the sliding plate. An eccentric part sealing device for a cutter eccentric type shield excavator, characterized by being provided with.