JP2700613B2 - How to replace seal device and seal sleeve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Prior Art FIG. 5 shows a conventional sealing device for a bearing portion of a tunnel machine. As shown in FIG. 5, an annular elastic seal 31 and a circular seal ring 32 with which the elastic seal 31 slides are used. Apparatus 30 was configured. FIG.
In this tunnel excavator, two seal rings 32 are used.
Holder 36.3 on the side of the cutter disk 35
7, respectively. In addition, not only a tunnel excavator for excavating a tunnel in a bedrock, but also a shield excavator for excavating a tunnel in gravel, sand, clay, and silt employs 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 does not have an elastically deformable structure. In other words, the seal ring was not replaceable in the narrow space of the tunnel. This is because the excavation distance in one tunnel excavation operation is short (usually about 1 km), and the seal ring does not wear out during the operation, so that it is not necessary to replace the seal ring during the operation.

As a prior art of this type of sealing device, there is a sealing device described in Japanese Utility Model Laid-Open Publication No. 2-89095, which can move a metal sealing sleeve with which an elastic sealing member slides relative to the elastic seal. When the sliding position of the elastic seal member is worn, 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. Therefore, in the above-mentioned conventional sealing device (seal ring), However, the following inconveniences have occurred.

[0006] The seal ring is an annular one-piece,
It is slightly smaller than the inside diameter of the tunnel excavator, and cannot be easily and resiliently deformed by elastically deforming the seal ring. Incorporation into is difficult.

[0007] Carbon steel is used for the seal ring, and the surface hardness should be quite high. However, if the excavation distance is significantly increased, the seal ring wears out during the operation and cannot be used.

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,
Although the service life of the seal sleeve is expected to be extended to some extent (for example, about twice), it is not possible to cope when the excavation distance is greatly increased.

The present invention has been made in view of the above points,
To reduce the thickness and weight of seal members (seal sleeves) equivalent to conventional seal rings, to make them easier to handle by deforming them, and to carry them into and out of narrow spaces such as inside excavators. To provide a seal device capable of achieving exchangeability, improved wear resistance compared to conventional seal rings, and higher relative rotation peripheral speed between seals. The purpose is.

[0011]

In order to achieve the above object, a sealing device of the present invention is provided between a) a relative rotating circumferential surface or a relative axial sliding circumferential surface; The inner peripheral surface side is constituted by an annular elastic seal, and c) the outer peripheral surface side with which this elastic seal slides has high radial bending elasticity and
Together constitute a sealing sleeve is elastically deformed into a flat form composed of easy thin steel strip, Li said sealing sleeve
It is detachably attached to the inner peripheral surface of the ring-shaped seal holder .

According to a second aspect of the present invention , d) the seal slot is provided.
The thickness of the tube can be 2-3 mm .

[0013]

[0014] As according to claim 3, e) the material of the thin steel strip of the sealing sleeve, it is preferable that the spring steel (containing high steel spring material).

[0015] As according to claim 4, f) when mounted between tunnel boring machine or between relative rotation circumferential surface of the shield machine or relative axial sliding surrounding surface, is particularly effective.

In the replacement of the seal sleeve, as described in claim 5 , 1) a new seal sleeve is elastically deformed and held in a flat shape such as an oval shape by approaching each other at substantially opposing portions. It can be carried out by carrying in as it is to the place where the seal sleeve is mounted, 2) removing the used seal sleeve, and then expanding the diameter of the new seal sleeve to the original form and mounting it.

[0017]

According to the seal device of the present invention having the above-described structure, the seal member on the outer peripheral surface side with which the elastic seal on the inner peripheral surface slides is made of a thin steel strip having high radial bending elasticity. , The thickness is extremely thin as compared with the conventional sealing member, and the weight is reduced. For this reason, even when the bore diameter becomes large, the seal sleeve is carried into a narrow space such as a tunnel excavator or shield excavator by elastically deforming it and maintaining it in a so-called flat shape such as an oval or gourd shape. After it has been carried into the mounting location, simply release its flat shape and the seal sleeve expands its diameter by self-elasticity and returns to its original annular shape. Exchange becomes possible. Further, when storing and storing the manufactured seal sleeve, the space can be reduced by holding the seal sleeve in a flat shape.

Further , the seal sleeve is provided on the seal holder.
Because it can be attached, the thickness of the seal sleeve is quite thin
Thus, the radial bending elasticity can be further increased,
Elastic deformation into a flat shape (such as an oval shape) is facilitated.
In addition, the seal sleeve must be supported by the seal holder.
It can be fixed with a set screw, etc.
It will be easier .

[0019]

According to the third aspect of the present invention, since the seal sleeve itself has a strong spring force, it is reliably fixed to a seal holder or the like, and the surface hardness is higher than that of a conventional carbon steel material. The abrasion resistance of the sliding contact surface (contact surface) of the seal is improved, and the life is extended even if the thickness is reduced.

[0021] The sealing apparatus according to claim 4, but is equipped between the tunnel boring machine or shield between the relative rotational circumferential surface of the excavator or relative axial sliding surrounding surface, the sealing device is improved wear resistance In addition, since the seal sleeve can be replaced, the excavation distance of the tunnel 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 used between the peripheral sliding surfaces in the relative axial direction (the middle bent portion of the excavator or the excavator, the slide connection point), mortar or the like may adhere to the surface, causing scratches, which may lead to flooding. If this is the case, the seal sleeve can be replaced, so that flooding can be prevented.

According to the replacement method of the fifth aspect , even when there is only a narrow space in the tunnel excavator, the seal sleeve can be carried near the cutter disk where the seal sleeve is mounted. It can be restored to an annular shape using the elastic force of the seal sleeve, and can be incorporated into a seal holder or the like.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the 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 cross-sectional view showing an upper half of a front portion of a tunnel excavator provided with a seal device according to the present embodiment. FIG. 2 is a perspective view showing a seal sleeve which is a part of the configuration of the seal device of FIG. 2A shows a normal state (diameter-expanded state), and FIG. 2B shows a state of being elastically deformed into an oval shape. FIG. 3 is an explanatory diagram viewed from the front showing a procedure for assembling the seal holder from a state of being elastically deformed into a gourd shape.

The outline of the tunnel excavator 1 is as follows. As shown partially in FIG. 1, the excavator 1 includes a cutter disk 4 at the front of an excavator body 2 having a cylindrical outer shell (shield wall) 3, thereby cutting a face. A large number of roller cutters 4s are arranged on the front surface of the cutter disk 4, and rotate by using a hydraulic motor 5 provided on the excavator body 2 as a drive source. A front portion of the excavator body 2 is partitioned by a bulkhead 6, and a manhole 7 through which an operator can enter and exit is opened at a central portion of the bulkhead 6, and a door 8 is mounted to be openable and closable so as to close this. 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 freely opened and closed.

In the excavator 1 of this embodiment, a fluid such as water is introduced into the cutter chamber 9 between the bulkhead 6 and the cutter disc 4 and excavated by the cutter disc 4 in order to secure the face pressure by a fluid transport system. The sometimes generated earth and sand is mixed with the water in the chamber 9 and discharged as muddy water. Therefore, although not shown in the drawing, a running water pipe, a sludge pipe, and the like, which communicate with the inside of the chamber 9, are provided.

A ring 4a at the rear end of the cutter disc 4 is inserted into an annular space between the cylindrical support 3a fixed to the outer shell 3 of the excavator body 2 and the cylindrical chamber wall 9a of the cutter chamber 9. , And are rotatably supported via bearings 14. A ring gear 4b is provided at the rear end of the ring body 4a.
Are mounted so as to be integrally rotatable, and mesh with the drive gear 5 a of the hydraulic motor 5. The ring body 4a includes inner and outer double ring portions 4a-0 and 4a-1, and an annular cover plate 4c is detachably mounted on the front surface (front surface) thereof with bolts 4d. The cover plate 4c and the cylindrical support 3 of the excavator body 2
A seal device 21 having a different structure is interposed between the seal device 21 and a in the circumferential direction.

The tunnel excavator 1 is provided 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 member 4a and between the relative rotation circumferential surfaces of the ring member 4a and the cylindrical chamber wall 9a.
Has been deployed. These sealing device 10 includes a resilient seal 11 in cross-section the lip-shaped with an annular, elastic sealing 11
The elastic seal 11 is disposed on the outer peripheral surface side and the seal sleeve 12 is disposed on the inner peripheral surface side so as to face each other. Also,
The elastic seal 11 includes a plurality of rows in the length direction of the excavator 1,
It is fixed with a ring type mounting 13.

On the other hand, the seal sleeve 12 is formed as shown in FIG.
As shown in FIG. 2B, a thin steel strip having high bending elasticity in the radial direction is used. In this embodiment, a spring steel having high strength and excellent spring characteristics is used. The dimensions of the seal sleeve 12 in the present example are 400 mm in width, 2 to 3 mm in thickness, and the outer diameter is slightly larger than the inner diameter of the ring holder 4a-1 and the cylindrical support 3a described later, and 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 formed as a seal holder, and the seal sleeve 12 is provided on the inner peripheral surface of the seal holder 4a-1 with its elastic restoring force. And fixed by a plurality of set screws 15 in the radial direction arranged at intervals in the circumferential direction. Similarly, the outer cylindrical support 3a is also configured as a seal holder, and a seal sleeve 1 is provided on the inner peripheral surface of the seal holder (cylindrical support) 3a.
2 is attached and similarly fixed with a set screw 15. In addition,
A shallow recess is formed at the mounting position of the seal sleeve 12 in each of the seal holders 4a-1 and 3a so that the seal sleeve 12 is fitted.

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

As a premise, it is assumed that the seal sleeves 12, 12 previously mounted on the inner and outer seal holders 4a-1, 3a have to be replaced due to wear and abrasion.

Each of the seal sleeves 12 is elastically deformed into a gourd shape as shown in the left end of FIG. 3, tied up with a band A or the like and held in a flat state. The door 8 is opened, and is carried into the cutter chamber 9 from the manhole 7.

A space is provided between the cutter disk 4 and the excavator body 2. In addition, after the worker who has entered the cutter chamber 9 at the end of the excavation removes the bolt 4d, the excavator body 2 is pulled back together with the ring body 4a after the excavation is completed, or the cutter disk 4 is inserted into the excavator after the excavation is completed. After being retracted together with the main body 2, the cutter disk 4 is moved forward while leaving the ring body 4a.

The worn and worn seal sleeve 12.
At 12, after the set screw 15 is removed, each is cut into an appropriate length, removed from the seal holders 4 a-1 and 3 a, and carried out from the excavator 1.

The band A is removed, and the respective inner and outer seal holders 4 a-1.
3a , inserted and assembled, and fixed with a set screw 15.

The excavator body 2 is moved forward to approach the cutter disk 4, and the operator uses the bolts 4 d to cover the cover plate 4 c
At the same time, the cutter disk 4 is connected to the ring body 4a,
Return to the original state.

FIG. 4 shows a sealing device 10 'according to another embodiment of the present invention. In this embodiment, as shown in FIG.
The tunnel excavator 1 divides the main body 2 back and forth, and inserts the outer shell outer peripheral surface 23 of the rear main body portion 2b into the outer shell inner peripheral surface 22 of the front main body portion 2a. 2
2 and 23 are slidably connected 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, the elastic seal 11 is fixed to the outer peripheral surface 23 side by being sandwiched in the front-rear direction by the 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 a shield wall itself, which forms a relative sliding surface with the elastic seal 11. The sliding surface was considerably softer than the seal sleeve 12. For this reason, the abrasion resistance was inferior, and the backing filler (mortar) adhered to the inner peripheral surface (sliding surface) to cause damage, and the sealing effect with the elastic seal 11 was sufficiently performed. It disappeared and could be flooded inside. However, according to the present embodiment, the hardness of the seal sleeve 12 is large, and the seal sleeve 12 is hard to be damaged. In addition, if there is a possibility that the seal sleeve 12 will be damaged and the water is flooded, the seal sleeve 12 can be replaced. It became possible to do. In addition,
Members common to those in the above-described embodiment are illustrated using common reference numerals, and description thereof is omitted.

Although the two embodiments have been described above, it goes without saying that the sealing device 10 of the present invention can be applied not only to the above-mentioned type in which the cutter disk 4 is supported on the outer periphery, but also to the type in which the cutter disk 4 is supported intermediately. Not only can the drilling method of the machine 1 be applied, that is, a pressurized muddy water method or an open method, but also a shield excavator (not shown) can be implemented in the same manner as the tunnel excavator. Further, the present invention can be applied to a bearing portion and a sliding portion of a rotary kiln and the like. Further, the present invention can be applied not only to the circular ring surface but also to an elliptical shape or the like.

[0040]

As described above, in the sealing device according to the present invention, the outer peripheral surface of the elastic seal, which is in sliding contact with the seal, is formed of the seal sleeve made of the thin steel strip having high bending elasticity in the radial direction. The following effects are produced.

1) Compared with the conventional sealing member, the thickness is extremely thin and light, and the sealing member can be elastically deformed and held in a flat shape such as an ellipse or a gourd shape. The loading and unloading of the seal sleeve becomes possible. This allows for the replacement of the seal sleeve. Further, for the same reason, the space for storing and storing the seal sleeve can be reduced.

2) Hold the seal sleeve with the seal holder
The seal sleeve can be made even thinner,
It can improve radial bending elasticity and reduce weight.
Can be easily fixed with set screws, etc.
The work of attaching and detaching the sleeve becomes easy .

[0043]

According to the third aspect of the present invention, 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. And the life is extended. In addition, since the wear resistance is improved and the rotational peripheral speed of the sealing device can be increased, the excavation operation with the cutter disk rotated at a high speed becomes possible, and the excavation efficiency is improved.

According to the seal device of the fourth aspect , 5) the excavation distance of the tunnel is greatly extended, and inundation which may occur due to adhesion of mortar or the like can be prevented.

According to the replacement method according to the fifth aspect , 6) even when there is only a narrow space in the tunnel excavator, the seal sleeve is carried into the mounting place, and the sealing is performed by using the elastic force of the seal sleeve when the seal sleeve is mounted. Since it can be incorporated in a holder or the like, replacement work can be performed easily and in a short time.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an upper half of a front part of a tunnel excavator provided with 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 shown in FIG. 1. FIG. 2 (a) shows a normal state (diameter expanded state), and FIG. This shows a deformed state.

FIG. 3 is an explanatory diagram viewed from the front and sequentially shows a procedure of assembling into a seal holder from a state of being elastically deformed into a gourd shape.

FIG. 4 is a cross-sectional view illustrating a part of a tunnel excavator provided 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 conventional tunnel excavator having a general sealing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tunnel excavator 2 Excavator main body 3a Cylindrical support part (seal holder) 4 Cutter disk 4a Ring body 4a-1 Ring part (seal holder) 10.10 'Sealing device 11 Elastic seal 12 Seal sleeve

Continued on the front page (72) Inventor Shigetomo Matsui 3-1-1 Higashi Kawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture Inside the Kobe Plant of Kawasaki Heavy Industries, Ltd. (72) Inventor Takeshi Yamada 3-chome, Higashi-Kawasaki-cho, Chuo-ku, Kobe-shi, Hyogo No. 1 Kawasaki Heavy Industries, Ltd. Kobe Plant

Claims (5)

(57) [Claims] 1. A sealing device provided between relative rotation circumferential surfaces or between relative sliding surfaces in a relative axial direction, wherein an inner peripheral surface side of the sealing device is formed of an annular elastic seal, and an outer periphery with which the elastic seal slides. High radial bending elasticity on the surface side
It is easy to elastically deform into a flat shape and the outer diameter is
Together constitute a sealing sleeve made of thin steel strip which is slightly larger than the inner diameter of the holder was installed, the seal Three
Is detachably attached to the inner peripheral surface of the ring-shaped seal holder.
A sealing device characterized by being attached . 2. The sealing sleeve has a thickness of 2 to 3 mm.
2. The sealing device according to claim 1, wherein: 3. The material of the thin strip steel of the seal sleeve.
Is made of spring steel (including high-strength steel for spring material).
Is the sealing device according to 2 . 4. Phase of a tunnel excavator or shield machine
Equipped between circumferential surfaces against rotation or between sliding surfaces in relative axial direction
The sealing device according to claim 1, wherein 5. The new seal sleeve is substantially opposed.
Place them close to each other at
The seal sleeve is installed at
Place , remove the used seal sleeve, and
Request to expand the seal sleeve to its original form
Item 5. A method for replacing a seal sleeve in a seal device according to any one of Items 1 to 4 .