JP6869762B2 - Swing cable bear structure of shield excavator - Google Patents

Description

The present invention relates to a swivel cable bear structure of a shield excavator (cable bear: registered trademark).

In a shielded excavator, segments are assembled in place on the tunnel wall by an elector device that is swivelly attached to the excavator body. Some such shielded excavators are provided with a swivel cable bear between the excavator body and the erector device. A plurality of cables such as a hydraulic hose and an electric cable connected to the tip side of the elector device are arranged in the swivel cable bear. The swivel cable bear has an arcuate inner peripheral side portion and an outer peripheral side portion connected to each other by a folded portion, and the lengths thereof change with the swivel of the erector device.

For example, in Patent Document 1, one end (the end of the outer peripheral side portion) of the swivel cable bear is fixed to the swivel ring of the erector device, and the other end (the end of the inner peripheral side portion) is fixed to the excavator main body. The bare structure is disclosed.

Japanese Unexamined Patent Publication No. 10-238299

By the way, in the swivel cable bear structure as described above, in general, a plurality of cables arranged in the cable bear are fixed by clamps near both ends of the swivel cable bear. Normally, a plurality of cables are arranged side by side in one stage in the swivel cable.

In recent years, the number and thickness of cables laid out in the swivel cable bear may increase from the viewpoint of increasing the tunnel diameter and explosion-proof specifications for electrical equipment. In this case, it is conceivable to arrange a plurality of cables in the swivel cable bear in at least two stages in the radial direction of the swivel ring.

In such a case, a cable located on the inner side in the radial direction at the folded part of the swivel cable bear (the one having a small radius of curvature at the folded part) and a cable located on the outer side in the radial direction at the folded part (curvature at the folded part). The required length differs depending on the one with a large radius). Therefore, if the cable is fixed by a clamp near both ends of the swivel cable bear, either the inner cable or the outer cable may be forcibly pulled when the elector device is swiveled.

Therefore, the present invention provides a swivel cable bear structure of a shield excavator capable of preventing unreasonable pulling of a plurality of cables arranged in at least two stages in the radial direction of the swivel ring in the swivel cable bear. The purpose is.

In order to solve the above problems, the swivel cable bear structure of the shield excavator of the present invention includes a swivel cable bear having a movable end fixed to the swivel ring of the erector device and a stationary end fixed to the excavator body. Of the plurality of cables arranged in the swivel cable bear in at least two stages in the radial direction of the swivel ring, and the plurality of cables provided near at least one of the movable end and the stationary end. It is characterized by comprising a support mechanism for supporting the cables of each stage so as to be able to slide relative to the cables of the other stages.

According to the above configuration, if the Electa device swivels and attempts to pull either the inner or outer cable, the cable slides. Therefore, it is possible to prevent excessive pulling on the cable.

The support mechanism includes a plurality of pipes accommodating the plurality of cables, a block having a plurality of guide holes through which the plurality of pipes are inserted, and a shaft of the pipes with respect to the block. It may include a plurality of springs urging on both sides of the direction. According to this configuration, when the Elekta device reversely turns from a large swivel state to near a reference position, the urging force of the spring can return the cable to a neutral state in which it can slide in both directions.

According to the present invention, it is possible to prevent unreasonable pulling of a plurality of cables arranged in the swivel cable bear in at least two stages in the radial direction of the swivel ring.

It is sectional drawing of the shield excavator which adopted the swivel cable bare structure which concerns on one Embodiment of this invention. It is a front view of the swivel cable bear and the swivel ring seen along the line II-II of FIG. It is sectional drawing along the line III-III of FIG. It is a figure which shows the state which the Elekta device rotated 210 degrees counterclockwise from the state of FIG. It is a top view of the support mechanism. It is a side view which showed a part of the support mechanism in cross section. It is sectional drawing along the line VII-VII of FIG.

FIG. 1 shows a shield excavator 10 adopting a swivel cable bear structure according to an embodiment of the present invention. The shield excavator 10 includes an excavator main body 1 and an elector device 2.

The excavator main body 1 includes a cutter head 11, a front body 12, and a rear body 13. Inside the front body 12 and the rear body 13, a plurality of shield jacks 14 that press the segment 25 to advance the excavator main body 1 are arranged. The erector device 2 is rotatably attached to the skeleton 15 of the rear body 13.

The elector device 2 assembles the segment 25 at a predetermined position on the tunnel wall surface. The erector device 2 has a swivel ring 21 that is rotatably supported along the rear barrel 13 inside the rear barrel 13, and a sliding portion that is attached to the swivel ring 21 and transports the segment 25 to a predetermined position on the tunnel wall surface. It has a grip portion 27 attached to the tip of the sliding portion 26 and gripping the segment 25. The swivel ring 21, the sliding portion 26, and the grip portion 27 are operated by an operator. As shown in FIG. 2, in the present embodiment, the swivel ring 21 is rotatably supported by a plurality of rollers 16 attached to the frame 15 of the rear body 13. However, the swivel ring 21 may be rotatably supported by a turntable bearing.

A swivel cable bear 3 is arranged inside the swivel ring 21. The swivel cable bear 3 has an arcuate inner peripheral side portion and an outer peripheral side portion that face each other in the radial direction. The inner peripheral side portion and the outer peripheral side portion are connected to each other by a folded portion.

In the present embodiment, the end of the outer peripheral side portion of the swivel cable bear 3 is the movable end 32 fixed to the swivel ring 21, and the end of the inner peripheral side portion is the stationary end 31 fixed to the excavator main body 1. is there. The erector device 2 is configured to be able to turn clockwise and counterclockwise to a predetermined angle (for example, 210 degrees) with the position shown in FIG. 2 as a reference position. For example, FIG. 4 shows a state in which the erector device 2 is turned counterclockwise by 210 degrees. However, the swivel cable bear 3 is arranged outside the swivel ring 21, the end of the outer peripheral side portion of the swivel cable bear 3 is fixed to the stationary end fixed to the excavator main body 1, and the end of the inner peripheral side portion is fixed to the swivel ring 21. It may be a movable end.

More specifically, as shown in FIG. 3, the outer peripheral side portion of the swivel cable bear 3 is guided by the outer cable bear receiver 43 having a U-shaped cross section, and the inner peripheral side portion is the inner cable bear receiver having a U-shaped cross section. Guided by 41. In the present embodiment, as shown in FIG. 2, the outer cable bear receiver 43 is divided into two guide pieces 44, and the inner cable bear receiver 41 is divided into three guide pieces 42. However, the outer cable bear receiver 43 may be divided into three or more guide pieces 44, or may be a single member. Further, the inner cable bear receiver 41 may be divided into two or four or more guide pieces 42, or may be a single member.

The outer cable bear receiver 43 is attached to the swivel ring 21 via the bracket 45. On the other hand, the inner cable bear receiver 41 is attached to the rear body 13 via a bracket (not shown).

In the present embodiment, the swivel ring 21 is composed of a narrow outer peripheral plate 22, a wide inner peripheral plate 24 projecting forward from the outer peripheral plate 22, and a pair of connecting plates 23 connecting them, and swivels. The cable bear 3 is arranged at a position closer to the front. However, it goes without saying that the configuration of the swivel ring 21 and the position of the swivel cable bear 3 are not limited to this.

Within the swivel cable bear 3, a plurality of cables (4 in the example) are arranged in at least two stages (two stages in the present embodiment) in the radial direction of the swivel ring 21. For example, the cable 6 is a hydraulic hose or an electric cable that connects from the stationary side (power supply unit, hydraulic supply / discharge unit, etc. in the figure) to the movable side (sliding portion 26, grip portion 27, etc.). However, the cable 6 is not limited to these.

As shown in FIG. 2, in the present embodiment, the support mechanism 5 is provided near both the movable end 32 and the stationary end 31 of the swivel cable bear 3. Each support mechanism 5 supports the cable 6 of each stage of the plurality of cables 6 so as to be able to slide relative to the cable 6 of the other stage. In this embodiment, each support mechanism 5 supports a plurality of cables 6 so that they can slide relative to each other. However, the support mechanism 5 is provided only in the vicinity of either the movable end 32 or the stationary end 31 of the swivel cable bear 3, and a plurality of cables 6 cannot slide relative to each other in the vicinity of the other. A clamp for fixing the cable may be provided.

As shown in FIGS. 5 to 7, each support mechanism 5 includes one rectangular parallelepiped block 8 and the same number of tubes 7 as the cable 6 penetrating the block 8. The tube 7 individually houses the cable 6.

In this embodiment, each tube 7 is divided into a pair of half-pipes 71. Flange 72s are provided at both ends of the half pipe 71, and the flanges 72 are fastened to each other with bolts B2.

The block 8 is directly or indirectly fixed to the cable bear receiver (outer cable bear receiver 43 or inner cable bear receiver 41) by bolts B1.

The block 8 is provided with a plurality of guide holes 8a through which the pipes 7 are inserted. In this embodiment, the guide holes 8a are arranged in a matrix. However, the guide holes 8a may be arranged in a staggered pattern.

In the present embodiment, the block 8 is divided into three block pieces 81 to 83 vertically (in the radial direction of the swivel ring 21) at the center of the guide hole 8a. However, the block 8 may be a single member.

The same number of springs 9 as the cable 6 are arranged on one side and the other side of the block 8. These springs 9 urge the pipe 7 against the block 8 on both sides of the pipe 7 in the axial direction.

More specifically, the spring 9 is a compression coil spring, which is interposed between the flanges 72 and the block 8 of both pipes 7.

As described above, in the swivel cable bear structure of the present embodiment, the elector device 2 swivels due to the action of the support mechanism 5, and the inner cable 6 (the radius of curvature at the folded portion of the swivel cable bear 3 is small). Even if either the outer cable 6 or the outer cable 6 (the one having a large radius of curvature at the folded portion of the swivel cable bear 3) is to be pulled, the cable 6 slides. Therefore, it is possible to prevent an unreasonable pull on the cable 6.

Further, in the present embodiment, since the springs 9 are arranged on both sides of the block 8 of the support mechanism 5, when the erector device 2 reversely turns from a large swivel state to near the reference position, the urging force of the spring 9 causes it. , The cable 6 can be returned to a neutral state where it can slide in both directions.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

For example, the block 8 may be divided into the same number of block pieces as the pipe 7. It is also possible for one tube 7 to accommodate some of the cables 6 in the same stage.

10 Shield excavator 1 Excavator body 2 Electa device 21 Swivel ring 3 Swivel cable bear 31 Static end 32 Movable end 5 Support mechanism 6 Cable 7 Pipe 8 Block 8a Guide hole 9 Spring

Claims (2)

The inner peripheral side portion and the outer peripheral side portion are connected by a folded portion, and the movable end which is one end of the inner peripheral side portion and the outer peripheral side portion is fixed to the swirling ring of the erector device, and the inner peripheral side portion and the inner peripheral side portion are connected. A hollow swivel cable bear (cable bear: registered trademark) in which the stationary end, which is the other end of the outer peripheral side portion, is fixed to the excavator main body,
A plurality of cables arranged in the swivel cable bear in at least two stages in the radial direction of the swivel ring, and
A support mechanism provided near at least one of the movable end and the stationary end, which supports the cable of each stage of the plurality of cables so as to be able to slide relative to the cable of the other stage. ,
The swivel cable bear structure of the shield excavator.
The support mechanism includes a plurality of pipes accommodating the plurality of cables, a block having a plurality of guide holes through which the plurality of pipes are inserted, and a shaft of the pipes with respect to the block. The swivel cable bear structure of a shielded excavator according to claim 1, comprising a plurality of springs urging on both sides of the direction.

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