JP2000226989A - Shield drive machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield machine in which a bearing or earth-sand seal can be replaced from the inner side of the shield machine. SOLUTION: This shield machine has a bearing boss 19 equipped with a bearing 10 and earth-sand seal 11 contacting to a drive shaft 6 of a cutter equipment arranged in a freely detachable manner at a boss portion 13 of the bulkhead, a freely slidable slide ring 15 is provided at the cutter boss side on the outer side of the boss portion 13 of the bulkhead, and a push-pull bolt 23 for pushing and pulling the slide ring 15 is provided at the slide ring 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator capable of exchanging bearings and earth and sand seals in contact with a drive shaft of a cutter device from inside the machine.

[0002]

2. Description of the Related Art As shown in FIG.
Is attached to the front of the cylindrical shield body 2.
It has a bulkhead 3 that divides the inside into a chamber 12 side and a gear casing 4 side, and has a gear casing 4 at the center on the back side of the bulkhead 3. A drive shaft 6 having a cutter device 5 attached to the front end thereof is rotatably supported by the bulkhead 3 and the gear casing 4. The drive shaft 6 is rotated by a cutter drive motor 7 attached to the gear casing 4. It has become.
In FIG. 5, reference numeral 8 indicates a cutter boss.

[0003] By the way, when earth and sand seals and bearings are worn out or sudden failures occur during excavation, conventionally,
As shown in FIG. 6, since the bulkhead 3 and the bearing boss 9 are integrated, the bearing 1
0 and earth and sand seal 11 cannot be replaced. Therefore, in order to exchange them, an operation in the chamber 12 is required, which is a very unsafe and large-scale operation.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a bearing and a dirt seal from the inside (the gear casing side) of a shield machine. It is to provide a shield machine that can be replaced.

[0005]

In order to solve the above-mentioned problems, a shield excavator according to the present invention is a shield excavator in which a drive shaft of a cutter device is rotatably supported by a bulkhead. A bearing boss provided with a bearing and a sand seal on the opposite side is detachably provided on the boss portion of the bulkhead, and a slide ring slidable on the cutter boss side is provided outside the boss portion, and
The slide ring is provided with a push-pull bolt for pushing and pulling the slide ring.

According to the above construction, the slide ring provided outside the boss portion of the bulkhead is advanced to the cutter boss side to shut off the chamber side in front of the bulkhead and the gear casing side behind the bulkhead. Can be. Therefore, the bearing boss is pulled out to the gear casing side, and the bearing and the earth and sand seal provided on the inner surface side of the bearing boss can be replaced with a new one.

Here, by providing the seal device on the inner peripheral side of the slide ring, when the slide ring is slid toward the cutter boss, the seal device can seal between the slide ring and the cutter boss.

Further, by providing a screw hole for jack bolt screwing in the flange of the bearing boss, the jack boss can be screwed into this screw hole and the bearing boss can be easily pulled out from the boss portion of the bulkhead.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a bearing boss 19 is mounted on the boss 13 of the bulkhead 3. The bearing boss 19 has a bearing 10 on the side facing the drive shaft 6.
And an earth and sand seal 11. Also, this bearing boss 1
9 is a boss 13 of the bulkhead 3
Attached to.

On the other hand, a slide ring 15 slidable in the front-rear direction is provided outside the boss 13 of the bulkhead 3. The inner diameter of the slide ring 15 is set to a size that can be fitted to the cutter boss 8 and sealable so that earth and sand do not enter the gear casing 4 during work.

FIG. 1 shows a state at the time of excavation. During excavation work, sealing devices 16, 17, and 17 are provided at predetermined locations so that earth and sand and groundwater in the chamber 12 do not enter the gear casing 4 side. 18 and 20 are arranged. Further, the guide ring 21 holding the sealing device 16 is fixed to the bulkhead 3 via the swash plate 22. Sealing device 17
Can be omitted, but in this example, it is installed to increase reliability.

The slide ring 15 can be slid back and forth by uniformly pushing and pulling push / pull bolts 23 provided at several places of the bulkhead 3. In FIG. 1, reference numeral 24 indicates a grease supply hole.

Next, the operation of the present apparatus will be described. When an abnormality occurs in the bearing 10 or the earth and sand seal 11 and it is necessary to replace the bearing, the cutter driving motor 7, the gear casing 4, the internal gears (not shown), etc. of FIG. Disassemble until.

Next, as shown in FIG. 2, grease is sufficiently supplied from the grease supply hole 24 of the bearing boss 19, and the earth and sand in the gap between the cutter boss 8 and the bearing boss 19 is replaced with grease D.

Next, the tightening nut 25 of the push / pull bolt 23 is removed, and each push / pull bolt 23 is pushed in evenly.
The slide ring 15 is slid in the direction of the cutter boss 8 until a predetermined dimension C is reached (see FIG. 3).

In this state, the sealing device 18 attached to the slide ring 15 prevents the earth and sand in the chamber 12 from entering the gear casing 4 side, and at the same time,
The position of a cutter device (not shown) is fixedly supported at the center of the bulkhead 3 via the cutter boss 8.

Next, after removing the bolt 14 (see FIG. 2) of the bearing boss 19, as shown in FIG.
9 screw holes 27 provided in the flange 26
Screw the jack bolt 28 into the jack bolt 2
8, the bearing boss 19 is evenly drawn out to the gear casing 4 side. In this way, even after the bearing boss 19 is removed, the slide ring 15 enables the sealing property and the position of the cutter device (not shown) to be fixed (see FIG. 4).

Thereafter, after replacing the bearing 10 and the earth and sand seal 11 of the bearing boss 19 with a new bearing and earth and sand seal (not shown), the bearing boss 19 is returned to the initial state of FIG. At this time, the bearing boss 19 is returned to the boss 13 of the bulkhead 3 in a procedure reverse to the procedure for pulling out.

As described above, according to the present invention, the earth and sand seals and bearings can be replaced from the inside of the shield machine, and there is no need to enter the chamber during the work, so that the earth and sand seals and bearings can be safely replaced. .

[0020]

As described above, the present invention relates to a shield excavator in which a driving shaft of a cutter device is rotatably supported by a bulkhead, and a bearing provided with a bearing and a dirt seal on a side facing the driving shaft. A boss is detachably provided on the boss portion of the bulkhead, a slide ring slidable on the cutter boss side is provided outside the boss portion, and a push-pull bolt for pushing and pulling the slide ring is provided on the slide ring. , The earth and sand seals and bearings can be safely and promptly replaced from the inside of the shield machine.

Further, by providing a screw hole for screwing a jack bolt on the flange of the bearing boss, the jack boss can be screwed into this screw hole and the bearing boss can be easily pulled out from the boss portion of the bulkhead.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a shield machine according to the present invention.

FIG. 2 is an explanatory view showing a state in which mud between a cutter boss and a bearing boss is replaced with grease.

FIG. 3 is an explanatory view showing a state in which a gap between a cutter boss and a bearing boss is closed by a slide ring.

FIG. 4 is an explanatory view showing a state where a bearing boss is pulled out.

FIG. 5 is a sectional view of a conventional shield machine.

FIG. 6 is an enlarged view of a portion denoted by reference numeral A in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 3 Bulkhead 5 Cutter device 6 Drive shaft 8 Cutter boss 10 Bearing 11 Earth and sand seal 13 Boss part 15 Slide ring 19 Bearing boss 23 Push-pull bolt

Claims (3)

[Claims] In a shield machine in which a drive shaft of a cutter device is rotatably supported by a bulkhead, a bearing boss provided with a bearing and a sediment seal on a side facing the drive shaft is provided on a boss portion of the bulkhead. A shield provided detachably, a slide ring slidable on the cutter boss side outside the boss portion, and a push-pull bolt for pushing and pulling the slide ring is provided on the slide ring. Excavator. 2. The shield machine according to claim 1, wherein a seal device is provided on an inner peripheral side of the slide ring. 3. The shield machine according to claim 1, wherein a screw hole for screwing a jack bolt is provided in a flange of the bearing boss, and a seal device is provided on an outer peripheral surface of the bearing boss.