JP3606733B2 - Drive mechanism of shield machine for rectangular section - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, the revolution wall body rotatably supported around the shield axis is supported in the opposite direction to the rotation of the rotation shaft body that is supported at the eccentric position of the revolution wall body and drives the cutter head. The present invention relates to a drive mechanism for a shield excavator for a rectangular section capable of excavating a tunnel having a rectangular section by revolving at a double speed.
[0002]
[Prior art]
Conventionally, for example, in Japanese Patent Laid-Open No. 4-281995 and Japanese Patent Laid-Open No. 5-209497, the revolution body rotatably supported by the shield shaft center is revolved, and the rotation shaft having the cutter head is set to the eccentric position of the revolution body. A shield tunneling machine for excavation of a rectangular cross-section tunnel that excavates a tunnel with a rectangular cross-section by rotating the rotating body in a reverse direction at a speed three times the rotation of the rotating shaft is proposed. Yes.
[0003]
In the shield excavator for rectangular cross section, a rotation drive device for the revolution body and a drive device for the rotation shaft are provided, and the cutter head is driven by controlling the rotation speed of each drive motor.
[0004]
There has also been proposed a planetary gear mechanism that performs revolution and rotation with a single input mechanism.
[0005]
[Problems to be solved by the invention]
However, according to the above-described conventional configuration, the revolution body and the rotation shaft have different loads and rotation speeds, so that there is a problem that the rotation movement and the revolution movement are unstable.
[0006]
According to the latter planetary gear mechanism, the rotation and revolution are stable, but a complex load is applied to the rotation shaft via the cutter head due to the excavation reaction force due to rotation and revolution, and the rotation body alone supports it. There was a problem that was difficult.
[0007]
An object of the present invention is to solve the above-mentioned problems and to provide a rectangular cross-section shield machine capable of stably controlling the rotation of the revolution body and the rotation shaft and capable of reliably supporting the rotation shaft. .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention enables the revolution speed of a revolution body supported rotatably around the shield axis at the front portion of the shield body to freely rotate to a position eccentric from the shield axis of the revolution body. In the drive mechanism of the rectangular cross-section shield machine capable of excavating a rectangular cross-section tunnel by setting the speed to 3 times in the opposite direction relative to the rotation of the rotation shaft to which the cutter head is attached, And a front bearing for rotatably supporting the rotation shaft, an external gear for revolution meshed with a drive gear driven by a cutter drive motor, and an internal gear for rotation fixed to the shield body. The rotating planetary gear meshed with the rotating internal gear is fixed to the rotating shaft, and a revolving support body that revolves in synchronization with the revolving body is disposed at the rear of the revolving body, and this revolving support is provided. body The rear bearing for rotatably supporting the rotation shaft is provided, the rotation shaft by a front bearing and a rear bearing is obtained by configured to support before and after-rotating planet gears.
[0009]
According to the above configuration, the planetary gear mechanism can stably and accurately drive and control the revolution and rotation, and the radial load and thrust applied to the rotating shaft by the revolving motion of the cutter head and the excavation reaction force due to the rotation motion. Even if the load in the direction and its fluctuation are large, it can be reliably supported by the front and rear bearings arranged before and after the planetary gear for rotation, and the internal gear for rotation and the planetary gear for rotation mesh with each other. Can be held well.
[0010]
According to a second aspect of the present invention, in the above configuration, an interlocking gear device for driving the revolution support to revolve is provided between the drive shaft rotated by the cutter drive motor and the revolution support.
[0011]
According to the said structure, a revolution support body can be revolved with the drive source same as a cutter drive, and synchronous drive can be comprised easily and compactly.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Here, an embodiment of a rectangular cross-section shield machine according to the present invention will be described with reference to FIGS.
[0013]
At the front part of the shield body 1 having a rectangular cross section, a cutter head 2 constituted by three spokes 2a whose front end part is located at the apex of an equilateral triangle when viewed from the front is disposed. At the front part of the shield body 1, a revolving partition wall 5, which is a revolving body, is supported by a support partition wall 3 via a revolving bearing 4 so as to be rotatable about a shield axis O. A supporting pressure chamber 6 is formed. Further, a rotating shaft 8 is rotatably supported via a front bearing 7 on an eccentric shaft center Oe that is eccentric from the shield shaft center O by an eccentric amount e by the revolving partition wall 5, and a cutter is attached to a tip portion of the rotating shaft 8. A head 2 is attached. The eccentric amount e of the cutter head 2 is
e = (L / 2) / cos30 °-(L / 2)
Is set to satisfy. Here, L is the length of one side of the equilateral triangle connecting the vertices of the cutter head 2.
[0014]
The cutter head 2 includes a plurality of cutter bits and a plurality of earth and sand intake ports (not shown) as well as a built-in copy cutter device 2b that can expand and contract in the radial direction in each spoke 2a. Reference numeral 9 denotes a soil removal device that is provided in the support partition 3 and discharges excavated sediment from the pressure chamber 6.
[0015]
The cutter head 2 is rotated (spinned) and revolved by a cutter driving device 10 disposed at the rear portion of the revolving partition wall 5. The cutter driving device 10 rotates the cutter head 2 by one rotation of the rotating shaft 8. On the other hand, the revolution partition wall 5 is configured to rotate three times in the opposite direction, and a rectangular cross section can be excavated by the rotation motion and the revolution motion of the cutter head 2.
[0016]
That is, the cutter driving device 10 includes a plurality of (four in the drawing, one in FIG. 2 for simplification) cutter driving motors 11 disposed at predetermined positions on the outer peripheral portion of the revolving partition wall 5 via the rear support wall 20. A drive gear 13 attached to a drive shaft 12 driven by the cutter drive motor 11, a revolving external gear 14 fixed to the outer periphery of the revolving partition 5 and meshed with each drive gear 13, and a revolving partition An internal gear 15 for rotation that is rotatably connected to the outer periphery of the rear portion 5 via a bearing 17 and is fixed to the shield body 1 via a front support wall 18, and an internal gear for rotation that is fixed to the rotation shaft 8. The planetary gear 16 for rotation which meshes | engages with 15 and the revolution partition 5 is revolved through the drive gear 13 and the external gear 14 for revolution by the cutter drive motor 11, and the planetary gear 16 for rotation and the internal gear for rotation are revolved. Biting with 15 Rotating the rotation shaft 8 about its axis by fit, it can be the cutter head 2 is driven to rotate.
[0017]
Further, in the cutter driving device 10, in order to stably support the rotating shaft 8 that receives a complex load via the cutter head 2 due to excavation reaction force due to revolution and rotation, the front bearing 7 provided in the revolution partition wall 5 is provided. In addition, a rear bearing 23 for supporting the rotation shaft 8 is provided on the revolution support wall 22 via a revolution support wall 22 which is a revolution support body. In other words, the revolution support wall 22 is supported on the inner peripheral portion of the rear support wall 20 via the support wall bearing 24 so as to be rotatable about the shield axis O, and is supported by the cutter drive motor 11 via the interlocking gear device 21. The wall 22 is linked and interlocked. In this interlocking gear device 21, an interlocking external gear 25 is attached to the outer peripheral portion of the support wall bearing 24, and the interlocking external gear 25 is attached to the drive shaft 12 of the cutter drive motor 11. Are connected to each other via two idle gears 27A and 27B. The gear ratio of the interlocking gear 26, the two idle gears 27A and 27B, and the interlocking external gear 25 is determined by the revolution of the revolution wall 5. Set to synchronize with.
[0018]
In the above configuration, when the cutter driving motor 11 of the cutter driving device 10 is driven, the revolving partition wall 5 is revolved by the drive gear 13 via the revolving external gear 14. Then, the rotation shaft 8 is revolved according to the revolution of the revolution partition wall 5, and the rotation shaft 8 is rotated via the rotation planetary gear 16 meshed with the rotation internal gear 15. Further, while the cutter head 2 is revolving around the shield axis O, the rotation shaft 8 is rotated about the eccentric axis Oe, and the revolving partition wall 5 is revolved three times in the opposite direction with respect to one rotation of the rotation shaft 8. . Accordingly, a tunnel having a rectangular cross section is excavated by the cutter head 2. At the same time, the revolving support wall 22 is rotated in synchronization with the revolving partition wall 5 by the interlocking gear 26 of the interlocking gear device 21 via the idle gears 27A and 27B. The
[0019]
According to the above configuration, since the rotation shaft 8 is supported by the support partition wall 3 and the rear support wall 20 by the front bearing 7 and the rear bearing 23 before and after the planetary gear 16 for rotation, the rotation motion and revolution motion of the cutter head 2 are achieved. The load in the radial direction and the load in the thrust direction acting by the excavation reaction force by can be reliably supported. Moreover, since the revolution support wall 22 is interlocked by the cutter drive motor 11, a separate interlocking drive source is unnecessary and can be simplified. Furthermore, since the revolution support wall 22 is formed in a minimum size including the revolution range of the rotation shaft 8 and is linked and interlocked via the two idle gears 27A and 27B, the whole can be made compact. The space around the revolution support wall 22 can be used effectively.
[0020]
【The invention's effect】
As described above, according to the invention described in claim 1 of the present invention, the planetary gear mechanism can stably and accurately drive and control the revolution and the rotation, and the excavation reaction force due to the rotation and rotation of the cutter head. Therefore, even if the radial load and the thrust load applied to the rotating shaft and their fluctuations are large, they can be reliably supported by the front and rear bearings arranged before and after the planetary gear for rotation. The meshing between the diverting internal gear and the planetary gear for rotation can be maintained well.
[0021]
According to the second aspect of the invention, the revolution support wall can be revolved by the same drive source as the cutter drive, and the synchronous drive can be easily and compactly configured.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a rectangular section shield machine according to the present invention.
FIG. 2 is a schematic configuration diagram showing a cutter head driving device of the rectangular section shield machine.
FIG. 3 is a cross-sectional view taken along the line AA shown in FIG.
[Explanation of symbols]
1 Shield body 2 Cutter head 3 Supporting partition wall 5 Revolving partition wall (revolved body)
7 Front bearing 8 Rotating shaft 10 Cutter driving device 11 Cutter driving motor 12 Driving shaft 13 Driving gear 14 Revolving external gear 15 Rotating internal gear 16 Rotating planetary gear 17 Bearing 18 Front supporting wall 20 Rear supporting wall 21 Interlocking gear device 22 Revolution support wall (revolution support)
23 Rear bearing 24 Support wall bearing 25 Interlocking external gear 26 Interlocking gear 27A, 27B Interlocking gear

Claims (2)

The revolution speed of the revolution body supported rotatably around the shield axis at the front part of the shield body is set so that the revolution axis of the revolution axis, which is rotatably supported at a position eccentric from the shield axis of the revolution body, is attached to the cutter head. In the drive mechanism of the rectangular cross-section shield machine capable of excavating a tunnel with a rectangular cross section by setting the speed three times in the opposite direction to the rotation,
The revolution body is provided with a front bearing for rotatably supporting the rotation shaft and an external gear for revolution meshed with a drive gear driven by a cutter drive motor, and an inner rotation for rotation fixed to the shield body. With tooth gear,
Fixing the planetary gear for rotation meshed with the internal gear for rotation to the rotation shaft,
In the rear portion of the revolution body, a revolution support body that revolves in synchronization with the revolution body is disposed, and a rear bearing that rotatably supports the rotation shaft is provided on the revolution support body,
A drive mechanism for a rectangular cross-section shield machine, wherein the rotation shaft is supported by front and rear bearings before and after a planetary gear for rotation. 2. A drive mechanism for a rectangular cross-section shield machine according to claim 1, wherein an interlocking gear device for driving the revolution support to revolve is provided between the drive shaft rotated by the cutter drive motor and the revolution support. .

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