JP2882979B2 - Cutter driving method of shield excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving a cutter of a shield excavator.

[0002]

2. Description of the Related Art In a shield type tunnel excavator, generally, a cutter is rotatably mounted on a front end of a shield excavator body, and a drive gear is provided so as to be rotatable integrally with the cutter. The drive gear is configured so that a pinion that is drivingly connected thereto is meshed with the drive gear. An example of such a shield excavator that uses an electric motor to drive a cutter and interposes a clutch with a speed reducer is disclosed, for example, in Japanese Utility Model Publication No. 61-29837. This is low noise by hydraulic motor drive, and
Environmental improvements were made such as the temperature inside the tunnel is unlikely to rise.

[0003]

In recent years, the size of shield-type tunnel excavators has been increasing, and the diameter of cutters has been increasing. Therefore, when transporting the shield tunnel excavator, the cutter, cutter bearing, drive gear, and the like must be divided and transported, and methods and structures for dividing the cutter, cutter bearing, and the like are being studied. However, there is a concern that the strength of the gear of the divided cutter or the like is reduced as compared with the integrated structure at the divided portion. On the other hand, in the case of a cutter with an integral structure, even if a part of the drive gear is lost, this drive gear is an important part of the excavator, so it is necessary to perform a major repair work, replacement work, etc. to return it to a complete one. However, there is also a problem that the working period is required to be several months and the construction of the tunnel whose work period is decided is greatly damaged.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a shield excavator in which the operability of driving a cutter is improved and breakage is prevented.

[0005]

According to the present invention, there is provided a method for driving a cutter of a shield excavator, wherein the cutter is rotatably mounted on a front end of a shield excavator body, and the cutter is integrated with the cutter. Rotatably connected to make multiple circumferential
In a shield excavator having a splittable drive gear, a pinion that meshes with the drive gear and transmits a driving force, and a motor that drives the pinion, the shield excavator usually includes
Without limiting the drive torque of the pinion by the motive.
Maximum transmission torque to the drive gear by pinion
And the rotational position detector causes the drive gear split portion to move forward.
When it is detected that the pinion is engaged with the pinion
The present invention is characterized in that the drive torque of the pinion by the electric motor is limited to adjust the torque transmitted to the drive gear by the pinion.

[0006]

In normal operation, the motor drives the pinion.
Without limiting the torque, the transmission to the drive gear by pinion
Drive torque by the rotational position detector
Is detected at the position of engagement with the pinion
Control the pinion drive torque by the motor.
The transmission torque to the drive gear by the pinion
Normally, the drive gear is driven with the maximum torque.
The split part of the drive gear moves to the position where it meshes with the pinion.
When it is located, the transmission torque to the drive gear is 0,
Is within the allowable range, and the drive gear
A) It is possible to prevent breakage and the like.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic sectional view of a shield excavator for carrying out a cutter driving method for a shield excavator according to one embodiment of the present invention, FIG. 2 is a plan view of a drive gear of the cutter, and FIG. FIG. 4 shows a section taken along line III-III, FIG. 4 shows a section taken along line IV-IV in FIG. 2, FIG. 5 shows a control block, and FIG.

As shown in FIG. 1, in a shield excavator 11 of the present embodiment, a cylindrical shield excavator body 12 is provided.
A cutter 13 is mounted on the front end of the support cylinder 14, and a support cylinder 14 integrated with the cutter 13 is rotatably supported by bearings 15 and 16. A rear portion of the support cylinder 14 of the cutter 13 is supported by a cutter bearing 18 having a drive gear 17 integrally formed on an outer peripheral portion. The cutter bearing 18 includes an outer ring 19, an inner ring 20, and a plurality of balls 21 integrally formed with a drive gear 17, and as shown in FIG.
The inner ring 20 is fixed to the shield excavator body 12 by a plurality of bolts 23, while the inner ring 9 is fixed to the support cylinder 14 of the cutter 13 by a plurality of bolts 22.

The shield excavator body 12 has four drive motors 24 (24a, 24b, 24c, 24d, FIG. 2).
4) are arranged along the circumferential direction, and each drive motor 24 is connected to a speed reducer 26 via a clutch 25 as shown in FIG.
Are pinned, and the pinion 28 is attached to the cutter bearing 18.
Of the driving gear 17 of the motor. Therefore, when each drive motor 24 is driven, its driving force is transmitted to the output shaft 27 via the clutch 25 and the speed reducer 26, and the pinion 28
Is driven to rotate, the drive gear 17 rotates, and the cutter 13 can rotate. The transmission torque (full load transmission torque and permissible transmission torque) is obtained by adjusting the strength of the electromagnetic force by incorporating the clutch 25 into or out of mechanical connection or by incorporating chromium-based fine particles.
Any of the types (powder clutch) that can adjust the pressure may be applied.

A plurality of shield jacks 29 are arranged in the circumferential direction in the shield excavator main body 12. The shield jack 29 extends rearward in the direction of excavation of the shield excavator 11, thereby excavating. The shield excavator body 12 is moved forward while being pressed against an existing segment (not shown) constructed on the inner peripheral surface of the tunnel.

In the shield excavator 11 of the present embodiment, the drive gear 17 (outer ring 19) of the cutter bearing 18 is divided into two parts by two divided parts 31 and 32 in the circumferential direction.
An origin detection piece 33 is fixed to the origin position of the drive gear 17 divided into two parts, and an origin detector 34 for detecting the origin detection piece 33 is attached to the shield excavator body 12. I have. The shield excavator body 12 has a tooth number detector 35 for detecting the number of teeth of the drive gear 17.
Are mounted, and the plurality of bolts 22
Are mounted on the outer ring 19 so as to be evenly distributed in the circumferential direction.
A bolt detector 36 for detecting the bolt 22 is attached to the shield excavator body 12. Then, as shown in FIG. 2, when the origin is O, the angles from the origin O to each of the divided portions 31 and 32 in the clockwise direction in FIG. 2 are φ ₁ and φ ₂ , respectively. The angles to the respective pinions 28 in the clockwise direction are θ ₁ and θ, respectively.
_2, θ _3, to set the theta _4.

In the control block of the shield excavator 11, as shown in FIG. 5 , each drive motor 24a, 24b,
24c and 24d are connected to the drive switch 41,
This drive switch 41 is connected to each drive motor 24a, 24b,
ON / OFF of 24c and 24d and a rotation direction can be controlled. Further, each clutch 25a, 25b, 25
c, 25d are connected to a clutch controller 42, and this clutch controller 42 is connected to each clutch 25a, 25b, 2
ON / OFF of 5c and 25d or switching of transmission torque can be performed. The drive switch 41 and the clutch controller 42 are connected to an arithmetic unit 43. The arithmetic unit 43 includes an origin detector 34, a tooth number detector 35,
The bolt detector 36 is connected, and the arithmetic unit 43 controls the clutch controller 42 based on signals input from the detectors 34, 35, 36 and the drive switch 41 to control the clutches 25a, 25b, 25c, The operation of 25d can be controlled.

In order to excavate and form a tunnel, first, the shield excavator body 12 is advanced while operating the plurality of shield jacks 29 in the extending direction and pressing the shield jack 29 against the front side of the existing segment. When the pinion 28 is rotationally driven by the generator 24 via the clutch 25, the speed reducer 26, and the output shaft 27, the drive gear 17 rotates to rotate the cutter 13. Then, the rock in front of the shield excavator body 12 is excavated by the cutter 13,
One of the plurality of shield jacks 29 is operated in the contraction direction to form a space between the existing segment and the new segment, and a new segment is mounted in the space. On the other hand, excavated earth and sand is discharged outside the mine by a conveyor or the like (not shown).

The arithmetic unit 43 previously stores the angle φ from the origin O to each of the divisions 31 and 32 in the clockwise direction in FIG.
₁ and φ ₂ and each pinion 28a, 28b, 2
Angles θ ₁ , θ ₂ , θ ₃ and θ ₄ up to 8c and 28d are set and input. Then, as shown in FIG. 6A, when the drive switch 41 is turned on, each drive motor 24a, 2
4b, 24c, and 24d are driven, the clutch controller 42 puts the clutches 25a, 25b, 25c, and 25d into the connected state (ON), and the drive gear 17 rotates clockwise in FIG. Thereafter, when the origin detector 34 detects the origin detection piece 33, it is input to the calculator 43 to recognize the origin position O, and the number-of-teeth detector 35 detects the number of teeth of the drive gear 17 and the bolt detector 36 detects the bolt 22 and inputs it to the computing unit 43 to recognize the rotation angle position of the drive gear 17, that is, the positions of the divided parts 31 and 32.

Then, for example, the divided portion 3 of the drive gear 17
When 1 reaches a position slightly before the pinion 28a, the computing unit 43 instructs the clutch controller 42 to put the clutch 25a into the disengaged state (OFF), and applies a load acting on the dividing portion 31 of the drive gear 17 by the pinion 28a. Reduce. When the divided portion 31 of the drive gear 17 passes the position of the pinion 28a, the drive torque is transmitted with the clutch 25a in the connected state (ON). In this embodiment, the driving gear 1
7 are divided into pinions 28a, 28b, 2
The arrangement of the pinions 28a, 28b, 28c, 28d is taken into consideration so as not to be simultaneously located at the positions 8c, 28d.

When the clutch 25 is a powder clutch, as shown in FIG. 6B, when the drive switch 41 is turned on, each of the drive motors 24a, 24b, 24
c, 24d are driven, and the clutch controller 42 connects each clutch 25a, 25b, 25c, 25d to
And N-1 state, the driving gear 17 in the allowable transmission torque T ₁ is rotated in the clockwise direction in FIG. Thereafter, when the origin detector 34 detects the origin detection piece 33, it is input to the calculator 43 to recognize the origin position O. At this time, each clutch 25a, 25b, 25c, 25d is connected and ON-
And 2 state, the driving gear 17 rotates at full load transmission torque T _2. Then, the number-of-teeth detector 35 detects the number of teeth of the drive gear 17 and the bolt detector 36 detects the bolt 22, which is input to a calculator 43, and the rotational angle position of the drive gear 17, that is, the divided portion The positions of 31 and 32 are recognized.

Then, for example, the divided portion 3 of the drive gear 17
When one reaches slightly before the position of the pinion 28a, the arithmetic unit 43 is changed to the allowable transmission torque T ₁ the clutch 25a as ON-1 state and instructs the clutch control unit 42, the division of the driving gear 17 by the pinion 28a The load acting on the part 31 is reduced. When the divided portion 31 of the drive gear 17 passes the position of the pinion 28a, the clutch 25a is turned on.
Changing the full load torque transmitted T ₂ as a state.

[0019]

As described above, according to the method for driving a cutter of a shield excavator according to the present invention, the cutter rotatably mounted on the front end of the shield excavator body and the cutter are provided. Is connected to the circumference
In a shielded excavator having a drive gear that can be divided into a plurality of directions, a pinion that meshes with the drive gear and transmits a driving force, and an electric motor that drives the pinion, an electric motor is normally used.
To the pinion without limiting the drive torque of the pinion
The rotational torque is detected by maximizing the transmission torque to the drive gear
The splitting part of the drive gear engages with the pinion
When it detects that the location is because by limiting the driving torque of the pinion by the electric motor so as to adjust the torque transmitted to the drive gear by the pinion, usually, the driving gear
Is driven with the maximum torque, and the split part of the drive gear is
Transmission to the drive gear when it is in the meshing position
The torque is set to 0 or within the allowable range, and it is possible to prevent the driving gear from being damaged without stopping the driving of the cutter and to improve the operability of the driving of the cutter.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a shield excavator for performing a cutter driving method of the shield excavator according to one embodiment of the present invention.

FIG. 2 is a plan view of a driving gear of the cutter.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a control block diagram.

FIG. 6 is a time chart of clutch control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Shield excavator 12 Shield excavator main body 13 Cutter 17 Drive gear 18 Cutter bearing 22 Bolt 24 Drive motor 25 Clutch 26 Reducer 28 Pinion 31, 32 Division 33 Origin detection piece 34 Origin detector 35 Number of teeth detector 36 Bolt detection Unit 41 drive switch 42 clutch controller 43 arithmetic unit

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takaharu Miyamoto 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo Prefecture Inside Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (56) , A) (58) Field surveyed (Int. Cl. ⁶ , DB name) E21D 9/08

Claims (1)

(57) [Claims] 1. A cutter rotatably mounted on a front end portion of a shield excavator main body, a drive gear connected to the cutter so as to be rotatable integrally with the cutter and capable of being divided into a plurality of pieces in a circumferential direction , and driven by meshing with the drive gear In a shield excavator equipped with a pinion for transmitting force and an electric motor for driving the pinion,
Normally, the driving torque of the pinion by the electric motor is
Transmission to the drive gear by the pinion without limiting the
Drive torque by the rotation position detector
Make sure that the split part of the gear is in the meshing position with the pinion.
Preparative when was detected, the cutter driving method of the shield excavator, characterized in that to limit the driving torque of the pinion by the electric motor to adjust the torque transmitted to the driving gear by the pinion.