JPH07269291A - Seal device and replacement method of seal sleeve - Google Patents

Abstract

PURPOSE:To reduce the wall thickness of a seal member (seal sleeve) and create a lighter-weight seal member and enable elastic deformation to be available and facilitate its handling and enhance wear-resistant properties as compared with the prior art seal ring and increase the rotary speed of a cutter disk as well. CONSTITUTION:A seal device 10 is laid out between a cylinder-shaped support section 3a and a ring member 4a and the ring member 4a and a cylinder-shaped chamber wall 9a respectively. The seal devices 10 comprise a cross section lip type elastic seal 11 and a metal-made seal sleeve 12 which is slidinsly connected to the tip of the elastic seal 11 where the seal sleeve 12 is made of a thin-walled hoop whose bending elastic properties are high in the radius direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device and a sealing device provided between relative rotary circumferential surfaces or relative axial sliding circumferential surfaces in a tunnel kiln, a shield machine, a rotary kiln, a screw conveyor and the like. The present invention relates to a method for replacing a seal sleeve in an apparatus, mainly in a bearing portion that rotatably supports a cutter disk of a tunnel excavator, and an axial direction (longitudinal direction) of a connection portion of a plurality of divided portions of a shield machine. The present invention relates to a sealing device for a sliding peripheral surface portion.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional seal device for a bearing of a tunnel machine, and as shown in the figure, an annular elastic seal 31 and a circular seal ring 32 with which the elastic seal 31 is in sliding contact provide a seal. The device 30 was constructed. Figure 5
In the tunnel excavator of the present invention, two seal rings 32 are used.
Side and cutter disk 35 side seal holder 36.3
7 are each positioned. Incidentally, not only a tunnel excavator mainly for excavating a tunnel in bedrock but also a shield excavator for excavating a tunnel in gravel, sand, and clay / silt uses a sealing device having a similar structure.

The conventional seal ring is generally made of SS material or carbon steel, has a thickness of 25 mm or more and is not elastically deformable. In other words, the seal ring was not replaceable in the narrow space at the tunnel pit. This is because the distance to be excavated in one tunnel excavation work is short (usually around 1 km), and since the seal ring is not worn during that time, it was not necessary to replace the seal ring during the work.

As a prior art of this type of sealing device, there is a sealing device described in Japanese Utility Model Laid-Open No. 2-89095, which is capable of moving a metal seal sleeve with which an elastic seal member is in sliding contact with the elastic seal. When the sliding contact position of the elastic seal member wears, the position of the seal sleeve is shifted to extend the life.

[0005]

However, recently, the distance to be excavated in one operation has been considerably extended to 2-3 km or more, and therefore, in the above-mentioned conventional sealing device (seal ring). The following inconveniences have occurred.

[0006] The seal ring is an annular one piece,
Since the size is slightly smaller than the inner diameter of the tunnel excavator and the seal ring cannot be easily and reconstituted by elastically deforming it, the seal ring can be carried into the tunnel excavator and installed at the mounting position. It is difficult to integrate into.

[0007] Carbon steel is used for the seal ring, and the surface hardness should be fairly high, but if the excavation distance is greatly extended, it will be worn during the work and unusable.

The seal ring is heavy and inconvenient to handle, and requires a large space for storage and storage.

In the case of the sealing device described in the above publication,
It is expected that the life of the seal sleeve will be extended to some extent (for example, by a factor of 2), but this cannot be dealt with when the excavation distance is greatly extended.

The present invention has been made in view of the above points,
The seal member (seal sleeve), which is equivalent to a conventional seal ring, has been made thinner and lighter, and it can be deformed for easier handling, and can be carried into and out of a narrow space such as in an excavator. It is possible to provide a seal device capable of achieving the following features, enabling replacement, improving wear resistance as compared with a conventional seal ring, and setting a higher relative rotational peripheral speed between seals. Has an aim.

[0011]

In order to achieve the above object, the sealing device of the present invention is provided a) between relative rotating circumferential surfaces or between relative axial sliding circumferential surfaces, and b) The inner peripheral surface side is composed of an annular elastic seal, and c) the outer peripheral surface side, which is in sliding contact with this elastic seal, is composed of a seal sleeve made of thin strip steel having high bending elasticity in the radial direction.

As described in claim 2, d) the seal sleeve may be detachably attached to the inner peripheral surface of the circular ring-shaped seal holder.

It is desirable that e) the outer diameter of the seal sleeve is slightly larger than the inner diameter of the seal holder.

As described in claim 4, f) it is preferable that the material of the thin strip steel of the seal sleeve is spring steel (including high strength steel for spring material).

It is particularly effective to equip g) between the relative rotating circumferential surfaces of the tunnel excavating machine or the shield excavating machine or between the relative axial sliding peripheral surfaces as described in claim 5.

For replacement of the seal sleeve, as described in claim 6, 1) the new seal sleeves are brought close to each other at substantially opposite positions and elastically deformed into a flat shape such as an oval shape and held. As it is, it can be carried out by carrying in to the place where the seal sleeve is attached, 2) removing the used seal sleeve, and then expanding and attaching the new seal sleeve to the original form.

[0017]

According to the seal device of the present invention having the above-mentioned structure, the seal member on the outer peripheral surface side, which is in sliding contact with the elastic seal on the inner peripheral surface side, is made of a thin strip steel having a high bending elasticity in the radial direction. Since it is configured as described above, the thickness is extremely thin and the weight is lighter than that of the conventional seal member. Therefore, even if the diameter becomes large, by elastically deforming and holding it in a so-called flat shape such as oval or gourd shape, the seal sleeve can be carried in even in a narrow space such as inside a tunnel excavator or shield machine. The seal sleeve expands due to its self-elasticity and returns to the original ring shape by simply releasing the flat shape of the seal sleeve after it has been carried into the mounting location. Can be replaced. Further, when the manufactured seal sleeve is stored and stored, the space can be reduced by holding it in a flat shape.

In the sealing device according to the second aspect, since the seal sleeve is attached to the seal holder, the thickness of the seal sleeve can be considerably reduced to further enhance the bending elasticity in the radial direction, and the flat shape (elliptical shape) can be obtained. Etc.) is easily elastically deformed. Further, since the seal sleeve is supported by the seal holder, it can be fixed by a set screw or the like, which facilitates the attachment / detachment work.

In the sealing device according to the third aspect of the invention, when the seal sleeve is assembled by being abutted against the inner peripheral surface of the seal holder, the seal sleeve receives an appropriate compressive stress in the circumferential tangential direction due to its elastic force, This compressive stress acts on the seal holder as a radial outward force.
Therefore, the seal sleeve is fixed to the seal holder without using a fixing member such as a set screw.

In the sealing device according to the fourth aspect, since the seal sleeve itself has a strong spring force, it is securely fixed to the seal holder and the like, and the surface hardness is harder than that of the conventional carbon steel material. The wear resistance of the sliding contact surface (contact surface) of the seal is improved, and the life is extended even if the thickness is reduced.

The sealing device according to claim 5 is provided between the relative rotating circumferential surfaces of the tunnel excavating machine or the shield excavating machine or between the relative axial sliding circumferential surfaces, but the sealing device has improved wear resistance. In addition, since the seal sleeve can be replaced, the tunnel excavation distance is greatly extended when the seal sleeve is used between the relative rotating circumferential surfaces (the bearing portion of the cutter disk). In addition, when it is used between the relative sliding surfaces in the relative axial direction (broken part of excavator or excavator, broken connection, slide connection point), mortar etc. may adhere to it to cause scratches, which may lead to flooding. In this case, the seal sleeve can be replaced, which prevents water from entering.

According to the exchange method of the sixth aspect, even when the tunnel excavator has only a small space, the seal sleeve can be carried up to the vicinity of the cutter disk where it is attached, and at the time of attachment, The elastic force of the seal sleeve can be used to restore the annular shape, and the seal sleeve can be incorporated into a seal holder or the like.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a sealing device according to the present invention is applied to a tunnel excavator will be described below with reference to the drawings, and a method for replacing a seal sleeve will also be described.

FIG. 1 is a sectional view showing an upper half of a front portion of a tunnel excavator equipped with a sealing device according to this embodiment, and FIG. 2 is a perspective view showing a sealing sleeve which is a part of the structure of the sealing device shown in FIG. In the figure, FIG. 2A shows a normal state (diameter expansion state), and FIG. 2B shows an elastically deformed state in an oval shape. FIG. 3 is an explanatory view seen from the front, which sequentially shows the procedure for incorporating the seal holder from the elastically deformed gourd shape.

The outline of the tunnel excavator 1 is as follows. As shown in part in FIG. 1, the excavator 1 is provided with a cutter disk 4 at the front of an excavator main body 2 having a cylindrical outer shell (shield wall) 3, by which a cutting face is cut down. A large number of roller cutters 4s are arranged on the front surface of the cutter disk 4, and rotate using a hydraulic motor 5 provided on the excavator body 2 side as a drive source. The front portion of the excavator main body 2 is partitioned by a bulkhead 6, and a manhole 7 through which a worker can enter and exit is opened in the central portion of the bulkhead 6, and a door 8 is attached so as to be openable and closable so as to close the manhole 7. ing. The door 8 is also provided with an opening 8a,
An auxiliary door 8b is attached to the opening 8a so as to be openable and closable.

The excavator 1 of the present embodiment is a fluid transport type, and in order to secure the face pressure, a fluid such as water is introduced into the cutter chamber 9 between the bulkhead 6 and the cutter disk 4, and the cutter disk 4 excavates. The earth and sand that sometimes occurs is mixed with the water in the chamber 9 and discharged as muddy water. Therefore, although not shown in the drawing, a flowing water pipe, a sludge pipe and the like communicating with the inside of the chamber 9 are provided.

The ring body 4a at the rear end of the cutter disk 4 is inserted into the annular space between the cylindrical support portion 3a fixed to the outer shell 3 of the excavator body 2 and the cylindrical chamber wall 9a of the cutter chamber 9. , Are rotatably supported via bearings 14. A ring gear 4b is provided at the rear end of the ring body 4a.
Is integrally rotatably attached and meshes with the drive gear 5a of the hydraulic motor 5. The ring body 4a is composed of inner and outer double ring portions 4a-0 and 4a-1, and an annular cover plate 4c is detachably attached to the front surface of the ring body 4a with bolts 4d. The cover plate 4c and the cylindrical support portion 3 of the excavator body 2
A sealing device 21 having a different structure is interposed in the circumferential direction from a.

The tunnel excavator 1 is equipped with the following sealing device 10. That is, as shown in FIG. 1, the sealing device 10 is provided between the relative rotation circumferential surfaces of the cylindrical support portion 3a and the ring body 4a and between the relative rotation circumferential surfaces of the ring body 4a and the cylindrical chamber wall 9a.
Have been deployed. Each of these sealing devices 10 is composed of an annular elastic seal member 11 having a lip-shaped cross section, and a metallic seal sleeve 12 with which a tip end of the elastic seal 11 slides, and the elastic seal 11 is provided on the outer peripheral surface side. The seal sleeves 12 are arranged on the inner peripheral surface side so as to face each other. Further, the elastic seal 11 is provided in a plurality of rows in the length direction of the excavator 1 and is fixed by the ring-type attachment 13.

On the other hand, the seal sleeve 12 is shown in FIG.
As shown in (b), it is made of thin strip steel having a high bending elasticity in the radial direction. In this example, spring steel having high strength and excellent spring characteristics is used. The seal sleeve 12 in this example has a width of 400 mm, a thickness of 2 to 3 mm, and an outer diameter slightly larger than the inner diameter of the ring holders 4a-0, 4a-1 described later, which is about 3000 mm here. However, the material and dimensions of the seal sleeve 12 are not limited.

In the sealing device 10 inside the ring body 4a, the inner ring portion 4a-1 of the ring body 4a is constructed as a seal holder, and the seal sleeve 12 is attached to the inner peripheral surface of the seal holder 4a-1 by its elastic restoring force. , And then fixed by a plurality of radial set screws 15 arranged at intervals in the circumferential direction. Also, the outer ring portion 4
Similarly, a-0 is also configured as a seal holder, and a seal sleeve 12 is attached to the inner peripheral surface of the seal holder 4a-0 and similarly fixed with a set screw 15. In addition, each seal holder 4
A shallow recess is formed at the mounting position of the seal sleeve 12 in a-0 and 4a-1, and the seal sleeve 12 is fitted therein.

Next, an example of a method of replacing the sealing device 10 of the above embodiment will be described.

As a premise, it is assumed that the seal sleeves 12, 12, which were previously attached to the inner and outer seal holders 4a-0, 4a-1, need to be replaced due to wear and abrasion.

Each of the seal sleeves 12 and 12 is elastically deformed into a gourd shape like the left end of FIG. 3 and is tied with a band A or the like to be held in a flat state, held by an operator and passed through the excavator main body 2, The door 8 is opened and the manhole 7 is carried into the cutter chamber 9.

A space is provided between the cutter disk 4 and the excavator body 2. In addition, in the space, after the worker who has entered the cutter chamber 9 in the completed state of the excavation removes the bolt 4d, the excavator main body 2 is pulled backward together with the ring body 4a, and the cutter disk 4 is excavated after the excavation is completed. After being retracted together with the main body 2, the cutter disk 4 is provided by moving it forward with the ring body 4a left.

Worn and worn seal sleeve 12
After removing the set screw 15, the pieces 12 are cut into appropriate lengths, removed from the seal holders 4a-0, 4a-1, and then carried out from the excavator 1.

The band A is removed, and the inner and outer seal holders 4a-0.
4a-1 is inserted and assembled, and fixed with a set screw 15.

The excavator main body 2 is moved forward to approach the cutter disk 4, and the worker uses the bolt 4d to cover the cover plate 4c.
Along with connecting the cutter disk 4 to the ring body 4a,
Restore the original state.

FIG. 4 shows a sealing device 10 'according to another embodiment of the present invention. In this example, as shown in FIG.
The tunnel excavator 1 divides the main body 2 into front and rear, and inserts the outer peripheral surface 23 of the rear main body portion 2b into the outer peripheral surface 22 of the front main body portion 2a. Two
2.23 is connected slidably in the axial direction. An annular mounting groove 22a is formed on the inner peripheral surface 22 side, and the seal sleeve 12 is mounted in the mounting groove 22a. On the other hand, on the outer peripheral surface 23 side, the elastic seal 11 is fixed by being sandwiched in the front-rear direction by annular positioning members 23.
Although illustration is omitted, in the conventional example, the elastic seal 11 is provided on the outer peripheral surface 23 side, but the inner peripheral surface 22 side is the shield wall itself and constitutes a relative sliding surface with the elastic seal 11. The sliding surface was considerably softer than the seal sleeve 12. Therefore, the wear resistance was inferior, and the inner peripheral surface (sliding surface) was scratched by the back-filling injection material (mortar) adhering to the elastic seal 11. There were times when it disappeared and flooded inside. However, according to this example, since the hardness of the seal sleeve 12 is large and the scratches are less likely to occur, and if there is a risk of water leakage due to scratches, the seal sleeve 12 can be replaced, so that water leakage is prevented beforehand. It became possible to do. In addition,
The members common to those in the above-described embodiment are illustrated by using the same reference numerals, and the description will be omitted.

Although two embodiments have been introduced above, it goes without saying that the sealing device 10 of the present invention can be applied not only to the above-mentioned type of supporting the cutter disk 4 on the outer periphery, but also to the type of supporting it intermediately and for tunnel excavation. Not only the excavation method of the machine 1, that is, the pressurized mud type or the open type, can be applied regardless of the method, but also a shield machine (not shown) can be implemented in the same manner as the tunnel excavator. It can also be applied to bearings and sliding parts such as rotary kilns. Further, the present invention can be applied not only to a circular ring surface but also to an elliptical shape or the like.

[0040]

As described above, in the sealing device of the present invention, the outer peripheral surface side on which the elastic seal slidably contacts is constituted by the seal sleeve made of thin strip steel having high bending elasticity in the radial direction. The effect like this occurs.

1) The thickness is much thinner and lighter than the conventional seal member, and since it can be elastically deformed and held in a flat shape such as an oval shape or a gourd shape, it can be attached to a mounting location in a tunnel excavator. Allows loading and unloading of the seal sleeve. This allows replacement of the seal sleeve. Further, for the same reason, the space for storing and storing the seal sleeve can be reduced.

In the sealing device according to the second aspect, since 2) the seal sleeve is held by the seal holder,
The thickness of the seal sleeve can be further reduced, the bending elasticity in the radial direction can be improved, the weight can be reduced, and the seal sleeve can be easily fixed by a set screw or the like.

In the sealing device according to the third aspect of the present invention, 3) When the seal sleeve is incorporated, the elastic force (biasing force) tends to spread outward in the radial direction of the seal sleeve itself.
Since it is attached to the seal holder by using, it can be fixed without using a fixing member such as a set screw.

In the sealing device according to the fourth aspect, 4) the fixing to the seal holder or the like is ensured, and the surface hardness is harder than that of the conventional carbon steel material, so that the sliding contact surface (contact surface) of the elastic seal is resistant to wear. And the life is extended. Further, since the wear resistance is improved and the rotation peripheral speed of the sealing device can be increased, the excavation work can be performed while the cutter disk is rotated at high speed, and the excavation efficiency is also improved.

In the sealing device according to the fifth aspect, 5) the excavation distance of the tunnel is greatly extended, and water infiltration that may occur due to adhesion of mortar can be prevented.

According to the replacement method of claim 6, 6) even when the tunnel excavator has only a small space, the seal sleeve is carried into its mounting location, and the elastic force of the seal sleeve is used at the time of mounting the seal sleeve for sealing. Since it can be installed in a holder etc., replacement work can be performed easily and in a short time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an upper half of a front portion of a tunnel excavator including a sealing device according to an embodiment of the present invention.

2 is a perspective view showing a seal sleeve which is a part of the configuration of the seal device of FIG. 1, FIG. 2 (a) shows a normal state (diameter expansion state), and FIG. 2 (b) shows an elliptical elastic shape. This shows the deformed state.

FIG. 3 is an explanatory view seen from the front, which sequentially shows a procedure for incorporating the seal holder in a state where the seal holder is elastically deformed into a gourd shape.

FIG. 4 is a sectional view showing a part of a tunnel excavator equipped with a sealing device according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing an upper half of a front portion of a tunnel excavator including a conventional general sealing device.

[Explanation of symbols]

 1 Tunnel machine 2 Machine body 4 Cutter disk 4a Ring body 4a-0 ・ 4a-1 Seal holder (ring part) 10 ・ 10 'Seal device 11 Elastic seal 12 Seal sleeve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Ego Kenji, 1-3 1-3 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe headquarters (72) Shigetomo Matsui Chuo-ku, Kobe-shi, Hyogo 3-1-1 Higashikawasaki-cho Kawasaki Heavy Industries, Ltd. Kobe factory (72) Inventor Takeshi Yamada 3-1-1 1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd. Kobe factory

Claims (6)

[Claims] 1. A seal device provided between relative rotating circumferential surfaces or between relative axial sliding peripheral surfaces, the inner peripheral surface side of which is constituted by an annular elastic seal, and the outer periphery with which this elastic seal makes sliding contact. A sealing device, characterized in that the surface side is composed of a sealing sleeve made of thin strip steel having high bending elasticity in the radial direction. 2. The seal device according to claim 1, wherein the seal sleeve is detachably attached to an inner peripheral surface of a circular ring-shaped seal holder. 3. The sealing device according to claim 2, wherein the outer diameter of the seal sleeve is slightly larger than the inner diameter of the seal holder. 4. The material of the thin strip steel of the seal sleeve is spring steel (including high strength steel for spring material).
The sealing device according to any one of 3 above. 5. The sealing device according to claim 1, which is provided between relative rotating circumferential surfaces or between relative axial sliding circumferential surfaces of a tunnel excavator or a shield machine. 6. The new seal sleeves are brought close to each other at substantially opposite positions, elastically deformed and held in a flat shape such as an oval shape, and are carried in to a place where the seal sleeves are attached, and used. The method for replacing a seal sleeve in a seal device according to claim 1, wherein after the seal sleeve is removed, the new seal sleeve is expanded and attached to its original shape.