JP2566933Y2 - Cutter spoke fixing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a shield excavator having a cutter spoke rotation mechanism for replacing a cutter bit, and mechanically fixing (stopping) the cut spokes.
The present invention relates to a cut-spoke fixing device that secures a fixing function by performing the following.

[0002]

2. Description of the Related Art Recently, demands for ultra-long-distance excavation are rapidly increasing with the use of underground space being expanded. By the way, a large number of cutter bits are provided on the radially arranged cutter spokes on the front surface of the shield machine, but they need to be replaced because they are worn by excavation. Conventionally, when exchanging cutter bits, workers have to remove the soil on the front of the cutter and create cavities by removing the soil in front of the cutter, and then carry out a new cutter operation. Had been replaced with a bit. With such a method, there is a danger of ground collapse or flooding, etc.In addition, a great deal of labor and labor are required for injecting a consolidation agent to stabilize the ground and for discharging soil to secure a work space. Man-hours were required.

[0003] Therefore, as shown in FIGS.
-165395 (conventional example 1) proposes an exchange device for the cutter bit 44. That is, a plurality of cutter spokes 43 are radially provided on the face of the cutter disk 41, and each of the cutter spokes 43 is provided with a shaft 42 provided vertically.
It is rotatably supported around. Cutter spoke 4
3, a cutter bit 44a is provided on the back side of the cutter bit 44 in use, which is exposed on the face side. A bevel gear 45 is mounted at the end of the shaft 42 on the cutter center side of each cutter spoke 43, and another bevel gear 46 meshing with the bevel gear 45 is mounted on the cutter center shaft. A pinion 47 is provided at the end of the center shaft, and a rack 48 that meshes with the pinion 47 is connected to the rod side of a hydraulic cylinder 49. The push-pull operation of the hydraulic cylinder 49 rotates the pinion 47 via the rack 48, and the bevel gears 46, 45 rotate accordingly, so that the cutter spoke 43 rotates around the shaft 42, that is, rotates. . As a result, the rear-mounted cutter bit 44a, which is provided in advance, comes out to the front and is replaced.

Japanese Utility Model Application Laid-Open No. 60-85394 (Conventional Example 2)
Discloses a shield machine in which a spoke with a cutter bit is tilted neutral, left, or right by a tilting mechanism in accordance with the rotation direction and soil quality of the cutter head to improve the life of the cutter.

[0005]

When the cutter mechanism is provided with a rotating mechanism R for rotating the cutter spoke 43 and bringing a new cutter bit 44a to the front surface (excavation surface) as in the conventional example 1, the cutter disk is replaced. When the excavation is performed by rotating 41, an external force acts on the cutter bit 44, and the cutter bit 43 tries to rotate itself. That is, the cutting resistance during excavation causes a force to rotate the Katas spoke 43, and if there is no fixing device in the Katas spoke 43, this force is transmitted to the Katas spoke rotating mechanism R composed of bevel gears and the like. May be damaged. This may hinder the rotation of the cutter spoke 43 and may cause a situation where the cutter bit 44 cannot be replaced. When the cutter mechanism 44 is operated to rotate the cutter spoke 43 when replacing the cutter bit 44, the amount of rotation of the cutter spoke 43 is deviated, so that the position is not constant and the individual cutter bits 44a themselves tilt. (The left and right sides are unevenly exposed on the face). When excavating in this state, the cutter bit 44a wears unevenly in addition to the increase in the rotational force based on the cutting resistance, and the replacement time is hastened. Even if the spare cutter bit 44a is provided on the peripheral surface of the cut-spoke 43, it will not be possible to cope with recent demands for ultra-long-distance excavation.

[0006] Even if the life of the cutter is somewhat improved, the shield excavator of the conventional example 2 does not have a spare cutter bit, so that it cannot cope with long-distance excavation.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to easily and reliably replace a cutter bit in order to respond to recent demands for ultra-long-distance excavation and secure a function of fixing a cut-spoke during excavation. It is to provide a device.

[0008]

In order to achieve the above-mentioned object, the present invention is provided with a cutter bit for replacement on the peripheral surface of a cut-spoke of a shield machine, and the cut-spoke can be rotated around an axis. In this, a part of the cut spoke is formed as a locked member, and a pair of guide members are projected from a cutter disk on both sides of the locked member, and between the guide member and the locked member. Switching means for sandwiching the stopper member, switching the stopper member between a locking position and a releasing position, and mechanical holding means for holding the stopper member at the locking position are provided. It is a cut-spoke fixing device.

[0009]

In the above construction, when the cutter bit is replaced, when the cutter member is displaced from the locking position to the disengagement position by the switching means and the cutter spoke is rotated, the spare cutter bit is exposed on the face side. Then, the stopper member is again displaced to the locking position by the switching means or the holding means, and the stopper member is sandwiched between the locked member and the guide member of the cutter spoke, and the cutter spoke generated by cutting resistance during excavation is rotated. The force is opposed by the rigidity of the stopper member and the guide member (cutter disk structure), and the rotation of the cut spoke is prevented. Then, even if the hydraulic pressure or the like of the switching means is lost by the mechanical holding means, the stopper member is always held in the locking position to secure the function of fixing the cut spoke.

In a normal case, when the stopper member engages with the member to be locked, the stopper member also exerts the positioning action of the cut spoke.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an arrangement of a cut-spoke, a cutter bit and the like on a front surface (a cutter disk surface) of a shield machine to which the present invention is applied, FIG.
FIG. 3 is an enlarged horizontal sectional view of the cut-spoke fixing device of the present invention, FIG. 4 is a view taken along the line XX in FIG. 3, and FIG.
In the arrow view, the right side shows the disk outer peripheral side, and the left side shows the coring (center) side.

In FIGS. 1 and 2, a cutter disk 1 on the front of a shield machine is provided with cut-spokes 3 radially from a coring 2 side, and a number of cutter bits 4 are arranged along each cut-spoke 3. Has been established. The cutter disc 1 is configured to rotatably shaft O ₁ around the drive motor M provided on board.

As shown in FIG. 3, three positions on the circumferential surface of the cut-spoke 3 formed in a column shape (each having a central angle of 1
The cutter bits 4 are respectively disposed at positions shifted by 20 °). The plurality of cutter bits 4 are provided in advance as replacements when one cutter bit is worn by excavation.

In FIG. 3, 4a and 4b are spare cutter bits.

The rotation mechanism itself of the Kata's spoke is the same as that of the above-mentioned conventional example 1 and will not be described in detail. However, the radius of the Kata's spoke 3 is changed by a rack and pinion drive via a bevel gear transmission mechanism as shown in FIG. rotating the axis O ₂ direction around the self, i.e., is capable of rotating configuration.
Therefore, when the cutter bit 4 in use is worn,
A new cutter bit can be switched by exposing the spare cutter bit 4a or 4b to the excavation (face) side by rotating the cutter spoke 3 by a predetermined angle (120 ° in this example) by a rotation mechanism.

In the present invention, a cutter spoke fixing device F is provided to prevent the cutter spoke 3 from rotating due to the cutting resistance generated when the cutter disk 1 rotates during excavation.

The cut-spoke fixing device F will be described in detail with reference to FIGS. A portion of the cut spokes 3 extending in the radial direction from the center of the shield is formed as a hexagon nut-shaped locked member 5, and a pair of guide members 7 project from the cutter disk 1 on both sides of the locked member 5. Has been established. A stopper member 6 formed in a spanner shape engages with the locked member 5 to lock and fix it. That is, in this embodiment, the stopper member 6 includes the spacer portion 6a and the contact portion 6b.
Is sandwiched between the guide member 7 and the locked member 5, so that the locked function of the locked member 5, that is, the cut-spoke 3, is exhibited. Accordingly, the stopper member 6 does not necessarily need to have the contact portions 6b that contact the two hexagonal surfaces of the locked member 5 as shown in FIG. 3, but has at least spacer portions 6a on both sides, for example, a U-shaped stopper member. It does not matter.

Arms 8 project from both sides of the stopper member 6, and a rod end of a hydraulic jack 9 as switching means is pivotally attached to the arm 8. The base of the hydraulic jack 9 is pivotally mounted on the cutter disk 1 side. The stopper member 6 can advance and retreat by the expansion and contraction operation of the hydraulic jack 9,
That is, it is possible to switch between a locking (fixed) position A and a releasing position B (indicated by a virtual line). Further, a box member 10 is provided so as to surround the entire cut-spoke fixing device F, thereby protecting the device from excavated earth and sand and preventing the fixing function from being hindered. The recess 6c provided in the stopper member 6 and the mounting seat 10a provided in the box member 10
A pressing spring 11 which constitutes a mechanical holding means is provided between the stopper member 6 and the stopper member 6. Has become.

Thus, when the stopper member 6 is at the locking position A shown in FIG.
Is locked and fixed by the spacer portion 6a and the guide member 7. That is, the cutter spoke 3 is configured to fix the cutter spoke 3 against the rotational force based on the cutting resistance due to the rigidity of the stopper member 6 and the guide member 7 (the cutter disk structure). In the present invention, the pressing spring 1 does not depend on the hydraulic pressure of the hydraulic jack 9 as the switching means.
Since the fixing function is obtained by mechanically holding the stopper member 6 at the locking position A in 1, the rotation preventing function of the cut spoke 3 is exhibited even if the hydraulic pressure is lost due to breakage of the hydraulic pipe or the like. When the worn cutter bit 4 is replaced, the hydraulic jack 9 serving as the switching means is pressed by the pressing spring 11.
After the stopper member 6 is disengaged from the locked member 5 by extending against the spring force of
Is rotated by 120 ° and a new cutter bit 4a or 4b
To the front position. Then, the hydraulic jack 9 is shortened again (in the above embodiment, the stopper member 6 is urged by the spring force of the pressing spring 11), and the stopper member 6 is fitted and locked to the locked member 5 to fix the cut-spoke 3. The operations of the rotary mechanism of the cut-spoke 3 and the hydraulic jack 9 are remotely controlled.

In the above embodiment, the stopper member is urged to the locking position by using a pressing spring as a mechanical holding means. Alternatively, the stopper member is locked by a hydraulic jack for switching. After being brought to the position, a wedge-shaped spacer (fixing member) may be inserted between the stopper member and the box member.

[0021]

According to the present invention, by exchanging cutter bits by the number of spare cutter bits by rotating the cutter spokes, it is possible to excavate for a very long distance, and the following effects are further obtained. During excavation, by receiving the force to rotate the Kata's spoke by the fixing device, it is possible to prevent the Kata's spoke rotating mechanism from being damaged by receiving a load.

In this case, the stopper member engaged with the engaging portion (locked member) of the cut-spoke is directly supported by the guide member of the cutter disk structure, instead of opposing the rotational force by the force of the hydraulic jack. Therefore, the castaspoke can be locked and fixed by the rigidity of the structure itself. Therefore, the fixing force is not affected by the magnitude of the hydraulic pressure of the jack, and the fixing function of the cut spoke can be secured even when the hydraulic pressure is lost.

[Brief description of the drawings]

FIG. 1 is a front view showing an arrangement of a cutter disk, a cutter bit and the like on a cutter disk surface in front of a shield machine to which the present invention is applied.

FIG. 2 is a side sectional view of the same.

FIG. 3 is an enlarged horizontal sectional view of the cut-spoke fixing device of the present invention.

FIG. 4 is a view taken in the direction of arrows XX in FIG. 3;

FIG. 5 is a view taken in the direction of arrows Y in FIG. 3;

FIG. 6 is a front view of a cutter disk showing an arrangement of a cutter spoke having a conventional rotation mechanism.

FIG. 7 is a partially omitted side sectional view of a cutter disk portion showing the rotation mechanism.

[Description of Signs] 1 ... Cutter disk 3 ... Cutter spokes 4 ... Cutter bit 4a, 4b ... (Reserve) cutter bit 5 ... Locked member 6 ... Stopper member 7 ... Guide member 8 ... Arm 9 ... Hydraulic jack (switching means) 11) Pressing spring (holding means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Sakuma 2-4-1, Nishi-Atsujigaoka, Chofu-shi, Tokyo Tokyo Electric Power Co., Inc. (72) Muneo Yoshimura 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. (72) Inventor Yukinobu Sasaki 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Osamu Yoshino 3-1-1 Higashikawasakicho, Chuo-ku, Kobe City, Hyogo Prefecture No. Kawasaki Heavy Industries, Ltd. Kobe Plant (72) Inventor Mitsuo Shimizu 3-1-1, Higashi Kawasaki-cho, Chuo-ku, Kobe City, Hyogo Prefecture Kawasaki Heavy Industries, Ltd. Kobe Plant

Claims (1)

(57) [Scope of request for utility model registration] 1. A cutter drill in which a cutter bit for replacement is provided in advance on a peripheral surface of a cutter spoke of a shield machine, and the cutter spoke is configured to be rotatable around an axis, wherein a part of the cutter spoke is locked. A pair of guide members project from a cutter disk on both sides of the locked member, a stopper member is sandwiched between the guide member and the locked member, and the stopper member is engaged. A cut-spoke fixing device, comprising: switching means for switching between a stop position and a release position; and mechanical holding means for holding at a locking position.