JPS6349800B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device, and particularly to a sealing device used in a shield tunneling machine.

Usually, a cutter head is rotatably supported at the front end of the shield body of a shield excavator, and a plurality of sealing materials are interposed between the cutter head and the front end of the shield body. By the way, since the shield excavator excavates underground, earth pressure, water pressure, etc. act strongly, so it becomes necessary to increase the seal length. Therefore, conventionally, as shown in FIG. 1, three sealants 3 are sequentially arranged in a stepped manner between the shield body 1 and the cutter head 2, and as shown in FIG. Three sealing materials 3' were successively arranged near the outer periphery of 1'. However, according to the conventional example above,
There is no problem if the shield diameter is small, but when the shield diameter increases to about 7 to 8 m, the machining accuracy of the sealing material attachment surface of the shield body and cutter head becomes worse, and when the cutter head is assembled into the shield body, However, there was a problem that the gap at the part where the sealing material was attached was not constant.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a sealing device capable of eliminating the above-mentioned drawbacks.

That is, the present invention provides an annular fixing member having a concave portion with one side open, an annular rotating member having a convex portion that can be fitted into the concave portion from one side, and an annular rotating member disposed along the inner surface of the concave portion of the annular fixing member. A sealing device characterized by comprising a plurality of sealing materials installed,
According to this configuration, when sealing the fixed body and the rotating body, it is only necessary to attach the annular fixed member to the fixed body side and the annular rotating member to the rotating body side, and the mounting surface of the sealing material can be precisely machined as in the conventional method. This is particularly advantageous for large-diameter shield tunneling machines, as it eliminates the need to do so, and also facilitates centering work during assembly. Further, since the seal portion is formed by a concave portion and a convex portion, a long seal portion can be ensured even though the cross section is small, and the attached device itself can be miniaturized. Furthermore, since the sealing device is compact, the mounting position of the sealing device can be brought closer to the center of rotation, and therefore the circumferential speed of the sealing portion can be reduced, and the life of the sealing material can be extended.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In Figure 3, 11 is a shield tunneling machine,
A cutter head 14 having a pressure chamber 13 inside is rotatably supported at the front end of the shield body 12 via bearings 15 and 16. The cutter head 14 is rotationally driven by a rotary drive device 19 via a ring gear 17 attached to the rear end of the support cylindrical portion 14a and a pinion 18 meshing with the ring gear 17. Reference numeral 20 denotes a sealing device according to the present invention, which is provided between the cutter head 14 and the shield body 12 and at a position slightly outward from the front bearing (swivel bearing) 15 of the cutter head 14. As shown in FIGS. 4 and 5, this sealing device 20 is attached to the seal body 12 side with bolts 21, and has a U-shaped cross section having a recess 22a with one side open on the cutter head 14 side. an annular fixing member 22, and a convex portion 2 that is attached to the cutter head 14 side with a bolt 23 and that can be fitted from one side of the recess 22a of the annular fixing member 22.
An annular rotating member 2 having a rectangular cross-sectional shape having a diameter of 4a.
4, and a plurality of bolts 25 (six in this embodiment) are arranged along the inner peripheral surface of the recess 22a of the annular fixing member 22 to seal the gap a between the annular fixing member 22 and the annular rotating member 24. It is composed of a sealing material 26. Each of the sealing materials 26 has, for example, three fin-like protrusions 26a, and a grease supply hole 2 is provided between the fin-like protrusions 26a, 26a.
6b is bored, therefore, the annular fixing member 2
A grease supply pipe 27 is installed inside 2. Note that 28 is a flexible hose that connects the grease supply source on the side of the shield body 12 and the grease supply pipe 27. Further, the annular fixing member 2
2 and the annular rotating member 24, and for managing the grease temperature in the space a between the space a and the annular rotating member 24, and the sealing device 2 in the space a.
0 and the front bearing 15 of the cutter head 14 are provided with cleaning pipes 29, 30, and 31, respectively. Note that 32 is a dust seal attached to the outer periphery between the annular members 22 and 24.

As mentioned above, since the above sealing device is unitized, when sealing a fixed body and a rotating body, it is only necessary to attach the annular fixed member to the fixed body side and the annular rotating member to the rotating body side. This eliminates the need to precisely process the mounting surface of the sealing material, and also facilitates centering work during assembly, which is particularly advantageous for large-diameter shield tunneling machines. Further, since the seal portion is formed by a concave portion and a convex portion, a long seal portion can be ensured even though the cross section is small, and the attached device itself can be miniaturized. Furthermore, since the sealing device is compact, the mounting position of the sealing device can be brought closer to the center of rotation, and therefore the circumferential speed of the sealing portion can be reduced, and the life of the sealing material can be extended.

Incidentally, FIG. 6 shows a case where the seal device 20' according to the present invention is applied to another type of shield tunneling machine.

Incidentally, in the above embodiment, the case where the seal device is applied to a shield excavator has been described, but it can be used not only for other excavators (horizontal type and rigid type) but also for other mechanical devices.

[Brief explanation of the drawing]

1 and 2 are vertical sectional views of a conventional example, and FIGS. 3 to 5 show an embodiment of the present invention.
4 is an enlarged sectional view of a main part, FIG. 5 is a partially cutaway perspective view of the sealing device, and FIG. 6 is an overall longitudinal sectional view of another embodiment. 11...Shield excavator, 12...Shield body,
14... cutter head, 20, 20'... sealing device,
22... Annular fixing member, 22a... Concave portion, 24... Annular rotating member, 24a... Convex portion, 26... Sealing material, 26
a... Fin-shaped projection, 26b... Grease supply hole.

Claims (1)

[Claims] 1. An annular fixing member having a concave portion with one side open, an annular rotating member having a convex portion that can be fitted into the concave portion from one side, and a plurality of annular fixing members arranged along the inner surface of the concave portion of the annular fixing member. A sealing device comprising: a sealing material.