JP2000073688A - Cutter device of shield excavation machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change over a roller cutter to a protruded position or a retracted position to a teeth cutter by supporting the roller shaft of the roller cutter at an eccentric position of a rotary member and rotating the rotary member. SOLUTION: Rotation support members 72, 73 are provided at the upper and lower parts between spoke members 50, 50 of the cutter device 3 to rotatably fit and support a rotary disk 65, and a driving shaft 79 is inserted in a sealed space through a sealing member to be driven by an electric motor through a wormgear. The shaft ends of a roller shaft rotatably supporting a roller cutter 40 are fitted and fixed in a notched recess 66a of the rotary disk 65. Hence, the roller cutter 40 can be changed over to the protruded position or the retracted position to the teeth cutter 44 by rotating the rotary disk. Further, a plurality of roller cutters 40 are rotatably connected by the driving shaft 79, and a locking means is provided in the driving shaft 79 to retain the protruded position and a sensor is provided to detect the rotary position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter device for a shield machine, and more particularly, to a roller cutter eccentrically mounted on a rotating member by rotating the rotating member. Is switched between a projecting position and a retreating position.

[0002]

2. Description of the Related Art Conventionally, a shield excavator used in a shield construction method for excavating the ground to form a tunnel and lining a segment on the inner surface of the tunnel generally excavates a ground containing a large amount of bedrock. When excavating a ground with a large amount of sediment, a cutter device equipped with a plurality of tooth cutters is used. Applied.

A general roller cutter is rotatably supported via a bearing on a roller shaft inserted therein, and both ends of the roller shaft are attached to a cutter frame. Is pressed against the ground in front of the rock (rock), and the cutter frame is driven to rotate, whereby the plurality of roller cutters crush the rock and excavate the rock.

[0004] On the other hand, a general teeth cutter is formed in a block shape having an excavating blade at a tip portion, and a plurality of teeth cutters are pressed against ground (sand) in the front via a cutter frame. Is rotationally driven, the excavation blades of the plurality of tooth cutters cut the earth and sand and excavate the ground.

[0005] By the way, in the case where the section where the tunnel is to be formed between the shafts is a ground containing a large amount of both bedrock layers and earth and sand layers, and the section where the tunnel is to be formed is excavated by one shield excavator, In addition, a composite cutter device in which a cutter frame is equipped with both a plurality of roller cutters and a tooth cutter is applied. Generally, this type of cutter device is designed to be able to cope with either the bedrock layer and the earth and sand layer, and the roller cutter is made to protrude slightly ahead of the tooth cutter, so that the rock bed can be reliably excavated by the roller cutter. I can do it.

On the other hand, Japanese Utility Model Laid-Open No. 5-27197 discloses that
A cutter device capable of switching a roller cutter for excavation provided on an outer peripheral portion of a cutter frame between a protruding position for excavation and a retreat position retracted from the protruding position is disclosed. In this cutter device, a cutter case for rotatably supporting a roller cutter is supported by a cutter frame so as to be able to advance and retreat, and a plurality of hydraulic jacks are provided between the rear end of the cutter case and the cutter frame. The jack is driven, and the roller cutter is driven forward and backward together with the cutter case to switch between the projecting position and the retreating position.

Further, in the cutter device disclosed in Japanese Patent Application Laid-Open No. 9-228781, a roller cutter for excavation provided on the outer peripheral portion of the cutter frame is moved over a protruding position and a retreating position in the same manner as in the above publication. A roller shaft for rotatably supporting the roller cutter, wherein a center axis position of a rectangular cross-sectional end of the roller shaft is eccentric to a rotation axis of the roller cutter. The position of the roller cutter, that is, the position of the roller cutter, is switched by rotating and changing the mounting posture of the frame to the mounting recess by 180 degrees.

[0008]

In a conventional combined cutter device in which a cutter frame is equipped with both a plurality of roller cutters and a tooth cutter, the plurality of roller cutters are configured to hit the ground in front of the tooth cutter. In particular, when excavating earth and sand layers including clay layers, there are problems such as multiple roller cutters hindering excavation, reducing excavation efficiency, and roller cutters hardly functioning and uneven wear. is there.

On the other hand, Japanese Utility Model Laid-Open No. 5-27197,
The cutter device disclosed in Japanese Patent No. 228781 switches a roller cutter for digging provided on an outer peripheral portion of a cutter frame between a projecting position and a retreating position, and excavates a bedrock layer and a soil layer without waste. It is not a technology to do.

Further, in the cutter device disclosed in Japanese Utility Model Laid-Open No. 5-27197, since the cutter case is linearly moved forward and backward, excavated soil or the like is sandwiched between the cutter case and the cutter frame, and the cutter case is smoothly moved forward and backward. In addition, since multiple hydraulic jacks are provided outside the cutter frame, there is a risk that troubles may easily occur in the hydraulic jack, and a hydraulic supply passage for supplying hydraulic pressure to the hydraulic jack is provided inside the cutter frame. It will be installed from the outside, and it is necessary to take measures to stop water, but there is no mention of that.

In the cutter device disclosed in Japanese Patent Application Laid-Open No. 9-228781, when changing the mounting posture of the roller shaft end into the mounting recess of the cutter frame in order to switch the position of the roller cutter, the roller shaft end is changed. It must be once removed from the mounting recess and rotated, and in order to remove the roller shaft end from the mounting recess, the support member fixed to the open end side of the mounting recess must also be released and removed. Therefore, the work of switching the position of the roller cutter is very difficult.

An object of the present invention is to make it possible to easily and reliably switch the position of a roller cutter between a projecting position and a retracted position in a cutter device of a shield machine.
Efficient excavation of both bedrock and sediment layers,
The purpose is to prevent wear of the roller cutter and the teeth cutter, and to reliably prevent water, earth and sand, etc. from flowing into the inside of the cutter frame.

[0013]

According to a first aspect of the present invention, there is provided a cutter machine for a shield machine in which a plurality of roller cutters are provided on a cutter frame, wherein the roller cutter is rotatably supported. A rotating member for supporting the shaft is provided, the rotating member is rotatably supported by the cutter frame, and the roller shaft is decentered with respect to the rotating axis of the rotating member to rotate the rotating member. Thus, the roller cutter can be switched between a protruding position for excavation and a retreat position retracted rearward from the protruding position.

In this cutter device, the rotating member is rotatably supported by the cutter frame, the roller shaft of the roller cutter is supported by the rotating member, and when the rotating member is rotated, the rotating member is rotated. The roller shaft of the roller cutter, which is eccentric with respect to the rotation axis, rotates about the rotation axis, and the protrusion position at which the roller cutter is used for excavation and the retreat position at which the roller cutter retreats rearward from the protrusion position. Are switched over.
As described above, since the rotation of the rotation member is not hindered by the rotation of the rotation member and the excavated soil or the like, the roller cutter is moved over the projecting position and the retreating position. Switching can be performed easily and reliably.

[0015] In a cutter device applied when excavating a ground containing both a bedrock layer and a sedimentary layer, a cutter frame is provided with both a plurality of roller cutters and a tooth cutter. The plurality of roller cutters to be excavated are configured to be switchable between the protruding position and the retreating position as described above, and the protruding position is set to a position where the roller cutter protrudes forward from the teeth cutter. By setting the entry position at a position where the roller cutter is retracted behind the tooth cutter, it is possible to excavate the bedrock layer and the earth and sand layer without waste.

That is, when excavating a bedrock layer, when the plurality of roller cutters are switched to the projecting position, the plurality of roller cutters are pressed against the front ground (rock) through the cutter frame, and the cutter frame is cut. Is driven to rotate, the plurality of roller cutters crush the rock and excavate the ground, and when excavating the earth and sand layer, when the plurality of roller cutters are switched to the retreat position, the cutter frame is moved. The plurality of teeth cutters are pressed against the ground (earth and sand) in the front, and the cutter frame is driven to rotate, so that the teeth cutters cut the earth and sand and excavate the ground.

As described above, when excavating a bedrock layer, by switching the plurality of roller cutters to the projecting positions, the plurality of teeth cutters are not obstructed by the excavation, and the plurality of roller cutters function reliably. In addition, when excavating the earth and sand layer, by switching the plurality of roller cutters to the retreat position, the plurality of roller cutters do not interfere with excavation, and the plurality of tooth cutters function reliably. Therefore, both the bedrock layer and the earth and sand layer can be efficiently excavated, and the wear of the roller cutter and the teeth cutter can be prevented as much as possible.

Here, when a plurality of roller cutters are arranged in a line in the axial direction, a plurality of rotating members corresponding to the roller cutters are connected by a shaft member or the like, so that a plurality of rotating cutters are provided. By rotating the moving member integrally, the plurality of roller cutters can be switched to the projecting position and the retreating position at a time, and as a result, the work efficiency of switching the positions of the plurality of roller cutters increases, The structure for switching the position of the roller cutter can be simplified.
In the case of a shield excavator that can be bent mainly, a roller cutter for excavation is also provided on the outer peripheral portion of the cutter frame. It can be configured to be switchable between positions.

According to a second aspect of the present invention, there is provided a cutter machine for a shield machine according to the first embodiment, wherein a plurality of teeth cutters are provided on a cutter frame of the shield machine, and the rotating member is rotated. The present invention is characterized in that the roller cutter is switched between a projecting position in which the roller cutter projects forward from the teeth cutter and a retracting position in which the roller cutter retracts behind the teeth cutter.

In this cutter device, by rotating the rotating member, the roller cutter extends between a projecting position in which the roller cutter projects forward from the teeth cutter and a retracting position in which the roller cutter retracts rearward from the teeth cutter. Can be switched reliably. By arranging the plurality of roller cutters so that the positions can be switched between the projecting position and the retreating position, when excavating a bedrock layer, the plurality of roller cutters are made to protrude forward from the tooth cutter. To the projecting position so that the teeth cutters do not hinder the excavation or do not contribute to the excavation. In this case, switch the roller cutters to the retracted position where they are retracted behind the tooth cutter, place the roller cutters out of the way of excavation, and use multiple tooth cutters to remove the sediment layer. Excavation can be performed efficiently and reliably, and wear of the roller cutter and the teeth cutter can be reliably prevented.

According to a third aspect of the present invention, there is provided a cutter device for a shield excavator according to the first or second aspect of the present invention, wherein the rotating member is disposed near a frame member that separates the inside and outside of the cutter frame. And a rotation driving means for driving the rotation member to rotate. In this cutter device, by disposing the rotating member near the frame member that separates the inside and the outside of the cutter frame, the rotating member can be surely rotationally driven by the rotational driving means provided inside the cutter frame. Can be.

According to a fourth aspect of the present invention, there is provided a cutter device for a shield excavator according to the third aspect of the present invention, wherein an opening through which a drive shaft integrated with a rotating member is inserted is formed in the frame member, and from this opening to the inside of the cutter frame. It is characterized in that a seal member for preventing inflow of water and earth and sand is provided. In this cutter device, the rotating shaft is reliably driven to rotate by the rotation driving means inside the cutter frame while the seal member prevents water or earth and sand from flowing into the inside of the cutter frame from the opening. be able to.

When a plurality of roller cutters are arranged in a line in the axial direction, adjacent rotating members of the plurality of roller cutters can be connected by a drive shaft, and the plurality of rotating members can be connected. By rotating one drive shaft of the plurality of drive shafts by the rotation drive means, the plurality of rotation members are integrally driven to rotate, and the plurality of roller cutters are moved to the projecting position and the retreating position. Can be easily and reliably switched at once.

According to a fifth aspect of the present invention, in the cutter apparatus for a shield excavator according to the fourth aspect of the present invention, the rotary member is positioned at a position corresponding to the projecting position of the roller cutter and at a position corresponding to the retracted position of the roller cutter. A positioning means is provided. In this cutter device, by positioning the rotating member at a position corresponding to the projecting position of the roller cutter by the positioning means, the roller cutter is reliably switched to the projecting position, and the rotating member corresponds to the retracted position of the roller cutter. The roller cutter can be reliably switched to the retracted position by positioning the roller cutter at the retracted position.

According to a sixth aspect of the present invention, there is provided a cutter device for a shield excavator according to the fourth or fifth aspect of the present invention, further comprising a locking means for locking the rotating member at a position corresponding to a projecting position of the roller cutter. It is a feature. In this cutter device, the locking member locks the rotating member at a position corresponding to the projecting position of the roller cutter, thereby preventing the rotating member from rotating due to the excavation reaction force acting on the roller cutter. The cutter can be reliably held at the projecting position.

According to a seventh aspect of the present invention, in the cutter apparatus of the shield excavator according to the sixth aspect of the present invention, the rotation drive means rotates a worm wheel provided on the drive shaft, a worm gear meshing with the worm wheel, and a worm gear. It is characterized by having an electric driving device to be driven.

In this cutter device, when the worm gear is rotationally driven by the electric drive, the worm wheel meshing with the worm gear is rotated together with the drive shaft, and the rotating member is driven to rotate. A high reduction ratio can be obtained by the worm gear mechanism having the worm wheel and the worm gear, so that a small-sized electric drive can be applied, and as a result, the space for arranging the electric drive can be easily secured and the manufacturing cost can be reduced. be able to. In a state where the electric drive is not driven, a locking action for preventing the rotating member from rotating by the worm wheel and the worm gear can be obtained.

According to an eighth aspect of the present invention, there is provided a cutter machine for a shield excavator according to the sixth aspect, wherein the rotary drive means has a drive source directly connected to the drive shaft and fixed to a frame member. Is what you do. In this cutter device, the drive shaft is rotated by the drive source, and the rotating member is rotationally driven. The configuration of the rotary driving means is very simple, and it is easy to secure a space for disposing the driving source, which is advantageous in terms of manufacturing cost.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is a shield machine capable of excavating both the bedrock layer and the earth and sand layer,
This is an example of a case where the present invention is applied to a composite type cutter device in which a cutter frame is equipped with a plurality of roller cutters and a tooth cutter. Note that the front, rear, left and right in the direction of excavation of the shield machine are referred to as front, rear, left and right.

As shown in FIGS. 1 and 2, the shield machine 1 includes a body member 2, a plurality of roller cutters 40 to 43, and a number of tooth cutters 44 provided on a cutter frame 30 provided in front of the body member 2. The cutter device 3, a frame body 4 fixedly provided at the front end portion inside the body member 2, a cutter rotation support mechanism 5 that rotatably supports the cutter device 3 on the frame body 4, and rotationally drives the cutter device 3. A cutter rotation drive mechanism 6 and the like are provided.

The frame body 4 has a first annular frame 10, an opening larger than the first annular frame 10, a second annular frame 11 on the front side of the first annular frame 10, and an outer peripheral portion near the rear surface of the first annular frame 10. The cutter device 3 excavates the space between the second annular frame 11 and the partition 13 formed by the vertical wall at the front end of the disk-shaped frame 12 and the cutter device 3. It is a chamber 14 for collecting excavated soil. Frame body 4
An annular recess 15 having an open front is formed on the front surface of the first annular frame 10, the inner surface of the second annular frame 11, and the outer surface of the disc-shaped frame 12. An agitator 17 for transporting excavated soil collected in the chamber 14 to the outside is provided below the frame body 10.

The cutter rotation support mechanism 5 has a ring frame 21 connected to a plurality of connection frames 20 extending rearward from the cutter frame 30 of the cutter device 3. And is rotatably supported via a ring gear 25 with a bearing provided between the first annular frame 10 and the front surface. Also, the ring frame 21 and the second
Seal members (not shown) are provided between the annular frames 11 and between the ring frame 21 and the outer surface of the disc-shaped frame 12.
Are provided so that water and earth and sand in the chamber 14 do not flow into the annular concave portion 15 behind the ring frame 21.

The cutter rotation drive mechanism 6 includes a ring gear 25 with a bearing fixed to the rear end of the ring frame 21, and a plurality of drive gears 2 meshing with the ring gear 25.
6. It has a plurality of drive motors 27 for respectively driving the plurality of drive gears 26 to rotate. The ring gear 25 and the plurality of drive gears 26 are disposed in the annular concave portion 15 on the rear side of the ring frame 21, and the plurality of drive motors 27 are fixed to the first annular frame 10 of the frame main body 4 so as to be inserted therethrough. , The cutter device 3 is rotationally driven via the plurality of drive gears 26, the ring gear 25, the ring frame 21, and the plurality of connection frames 20.

The rear of the frame body 4 inside the body member 2 is shown in addition to a plurality of rearwardly facing shield jacks 16 mounted at appropriate circumferential intervals along the inner surface of the body member 2. Although not shown, there are also provided an erector device for assembling the segments on the inner surface of the excavated tunnel, a perfect circle holding device for holding the perfect circle of the segments assembled on the inner surface of the tunnel, and the like. When the shield machine 1 is configured to be able to be folded in the middle, the body member 2 is composed of a front body and a rear body that can be folded, and a plurality of center-bending jacks for swinging the front body with respect to the rear body. Is also provided. Since these members and devices are well-known, the description will be omitted.

The cutter device 3 will be described with reference to FIGS. The cutter device 3 includes a cutter frame 30, a plurality of roller cutters 40 to 43 mounted on the cutter frame 30, and a number of tooth cutters 4.
In particular, a plurality of roller cutters 40 and 43 among the plurality of roller cutters 40 to 43 extend over a protruding position for excavation and a retreating position retracted rearward from the protruding position. And can be switched.

The cutter frame 30 has a plurality of (for example, eight) cutter spokes 31 to 33 radially extending radially outward from a central portion thereof, and a plurality of cutter spokes having the same diameter and concentric with the body member 2. A tubular member 34 to which the distal ends of the spokes 31 to 33 are fixed; and a plurality of covers each having a substantially rectangular cross-section and arranged along the cutter spokes 31 to 33 on the rear side of the cutter spokes 31 to 33. It is composed of a frame 35 and the like.

Each cutter spoke 31 (32, 33)
Has a pair of plate-shaped spoke members 50 extending in parallel in the radial direction at predetermined intervals, and between the spoke members 50, a plurality of roller cutters 40 are arranged in a line in the radial direction and axially in the radial direction. It is provided to rotate as a heart. 1
Between the pair of spoke members 50, a plurality of sets of saddles 51 are fixedly provided at predetermined intervals in the radial direction, with one pair of plate-shaped saddles 51 orthogonal to the spoke members 50 as one set,
One roller cutter 40 is provided corresponding to each pair of the saddles 51.

Each saddle 51 is fixed to a pair of spoke members 50 by welding or the like, and a rear end of the saddle 51 is fixed to a front end of the cover frame 35. A pair of frame members 70 (see FIGS. 5 to 7) that partition the inside and outside of the cutter frame 30 are symmetrically fixed to the inner surface of the spoke member 50. FIG.
As shown in FIG. 5, between the pair of saddles 51 in which the roller cutter 40 is disposed, the front wall of the cover frame 35 faces the rear side, and the cover frame 35 and each saddle 5
1, a sediment passage 52 through which excavated soil passes is formed.

On the other hand, as shown in FIG. 4, there is no front wall of the cover frame 35 between the saddles 51 where the roller cutter 40 is not provided, and the rear end of each spoke member 50 and the rear end of the saddle 51 are not provided. A cover plate 53 covers the space between the pair of spoke members 50 and the pair of frame members 70, and a face plate 56a is fixed to the front ends of the pair of spoke members 50 and the pair of frame members 70. ) And the inside of the cover frame 35 are in communication with each other.

In each of the cutter spokes 31 (32, 33), a portion of the pair of spoke members 50 from the center in the length direction to the center of the cutter frame 30 and a pair of the spoke members 50 from the center of the length direction. A plurality of teeth cutters 44 are mounted on a pair of plate-like frames 55 provided so as to spread radially outward. The face plate 56 is attached between the adjacent cutter spokes 31 (32, 33), and most of the excavated soil passes through the slit 57 between the face plate 56 and the cutter spokes 31 to 33, and passes through the chamber 14.
Collected inside.

FIG. 5 shows a structure for switching the roller cutter 40 between the projecting position and the retreating position.
This will be described in detail with reference to FIGS. Each roller cutter 4
Reference numeral 0 denotes a roller shaft 60 which is rotatably supported by a roller shaft 60 passing therethrough via a bearing (not shown).
The shaft ends 61 having a rectangular cross section at both end portions of the
5, and a pair of rotating members 65 are rotatably supported by a pair of frame members 70 of the cutter frame 30, respectively.

The roller shaft 60 (the shaft end 61) is eccentric with respect to the rotation axis a of the rotation member 65, and the rotation of the rotation member 65 causes the roller shaft 60 to rotate. Rotating around, the roller cutter 40 is switched between the projecting position and the retracted position. Here, the projecting position is set so that the roller cutter 40 projects forward from the tooth cutter 44, and the retracting position is set so that the roller cutter 40 retracts backward from the tooth cutter 44. Have been.

As shown by the solid line in FIG. 7, the state in which the roller cutter 40 is in the protruding position is changed to the rotation member 65.
When the roller cutter is rotated by 90 degrees, the roller cutter 40 retreats behind the tooth cutter 44 as shown by a chain line in FIG. 7, and the position of the roller cutter 40 may be set to the retreat position. In the case of the mode, the rotating member 65 is rotated by 180 degrees from the state where the roller cutter 40 is located at the projecting position, and the position where the roller cutter 40 is most retracted to the rear side from the teeth cutter 44 is defined as the retracted position.

Each of the rotating members 65 has a notched concave portion 66a whose outer peripheral side is opened, and a block which is engaged with the notched concave portion 66a of the rotating member main body 66 so as to close its open end. A pivot member main body 66
In the state where the shaft end 61 of the roller shaft 60 is fitted in the notch recess 66a, the block piece 67 is engaged with the notch recess 66a, and the shaft end 61 is
In this state, the outer peripheral surface of the rotating member 65 is 36
The outer peripheral surface has the same diameter over 0 degrees.

Each of the frame members 70 has a partition wall 71 for partitioning the inside and the outside of the closed space 54 in the cutter frame 30, and a cutout recess 72 a fixed to a surface of the partition wall 71 on the side opposite to the closed space 54. And a rotation supporting body member 72 having an arc-shaped inner surface 72b connected to the notch recess 72a, and a rotation engaging with the notch recess 72a of the rotation supporting body member 72 and having an arc-shaped inner surface 73a. The support division member 73 is provided.

In a state in which a part of the rotation member 65 is fitted to the inner surface 72b of the rotation support main body member 72, the rotation support division member 73 is engaged with the notch recess 72a of the rotation support main body member 72. At the same time, it is fastened to the rotation support main body member 72 by a plurality of bolts 74, and in this state, an inner surface having a circular cross section is formed by the inner surfaces 72b and 73a.
(b, 73a), the rotating member 65 is slidably rotatably supported. In addition, since the rotating member 65 is fitted inside the frame member 70, the block piece 67 is attached to the rotating member main body 66.
The shaft end portion 61 is securely supported by the rotating member 65 without coming off.

Each of the frame members 70 is provided so that a reaction force from the ground in front thereof can be reliably received during excavation.
The rear end portion is in contact with the block member 75 fixed to the spoke member 50 by welding or the like from the front side and is fixed in this state by welding or the like, and is also fastened by the plurality of bolts 76.

In the closed space 54 inside the cutter frame 30, a rotary drive mechanism 80 for driving the rotary member 65 to rotate is provided. This rotation drive mechanism 80
In each of the cutter spokes 31 (32, 33), the rotating members 65 corresponding to the adjacent roller cutters 40 are connected by a drive shaft 79 by a mechanism common to the plurality of roller cutters 40, and the plurality of rotating members 65 By rotating one drive shaft 79 among the plurality of drive shafts 79 connected to each other, the plurality of rotating members 65 are integrally rotated.

The drive shaft 79 is connected to the adjacent rotating members 65 through the closed space 54.
The opening 71 through which the drive shaft 79 is inserted is
In order to prevent water or earth and sand from flowing into the closed space 54 from the opening 71a, the frame member 70 and the rotating member 65 are provided with seal members 70a and 70a.
0b is attached.

As shown in FIGS. 5 and 6, the rotary drive mechanism 80 includes a worm wheel 81 provided on a drive shaft 79.
Worm gear 82 meshing with the worm wheel 81
And an electric motor 83 that rotationally drives the worm gear 82. Further, one of the pair of rotating members 65 corresponding to the roller cutter 40 is attached to at least one of the plurality of roller cutters 40, and
A lock member 85 is provided as locking means for locking at a position corresponding to the 0 protruding position.

The lock member 85 has an engaging portion 85a at the front thereof which can be engaged with a rectangular shaft 79a having a rectangular cross section fixed to the drive shaft 79. The rear end portion of the lock member 85
By fixing and fixing the saddle 51 to the saddle 51 from the inside of the sealed space 54 with bolts or the like, the engaging portion 85a
a, the rotation of the rotating member 65 together with the drive shaft 79 is prevented, and the rotating member 65 can be locked at a position corresponding to the projecting position of the roller cutter 40. By locking one rotating member 65, the rotation of the integrally connected rotating member 65 can also be locked, so that the plurality of cutter rollers 40 can be held at the protruding positions.

As shown in FIG. 6, for example, a pair of detected parts 90 fixed to one of the plurality of drive shafts 79 and a detection part capable of detecting the detected part 90 A sensor 91 is provided.
The rotation member 65 can be positioned at a position corresponding to the projecting position of the roller cutter 40 and at a position corresponding to the retreat position of the roller cutter 40 by (corresponding to positioning means).

The operation and effect of the cutter device 3 will be described. The rotating member 65 is rotatably supported by the cutter frame 70, and the shaft end 61 of the roller shaft 60 of the roller cutter 40 is supported by the rotating member 65. The roller shaft 60 of the roller cutter 40 eccentric to the rotation axis a of the moving member 65 rotates about the rotation axis a, and the roller cutter 40 switches between the projecting position and the retreating position. Can be As described above, since the rotation of the rotation member 65 is not prevented by merely rotating the rotation member 65 and excavated soil or the like, the roller cutter 40 is moved between the projecting position and the retreating position. Thus, the switching can be easily and reliably performed.

When excavating a rock bed, when the plurality of roller cutters 40 are switched to the projecting position, the plurality of roller cutters 40 are pressed through the cutter frame 30 against the ground in front (rock), and Frame 30
Is driven to rotate, so that a plurality of roller cutters 4
The rocks 0 to 43 crush the rock and excavate the ground. Further, when excavating the earth and sand layer, when the plurality of roller cutters 40 are switched to the retreat position, the plurality of tooth cutters 44 are pressed by the front ground (earth and sand) via the cutter frame 30 and the cutters are cut. When the frame 30 is rotationally driven, the plurality of teeth cutters 44 cut the earth and sand to excavate the ground.

As described above, when excavating a bedrock layer, the plurality of roller cutters 40 are switched to the projecting position,
The plurality of tooth cutters 44 do not hinder the excavation or do not contribute to the excavation, so that the plurality of roller cutters 40 can reliably function. By switching to the retreat position, the plurality of roller cutters 40 are set in a state where they do not hinder excavation, and the plurality of tooth cutters 4
4 can function reliably, so that both the bedrock layer and the earth and sand layer can be efficiently excavated, and the wear of the roller cutter 40 and the teeth cutter 44 can be prevented as much as possible.

A frame member 70 that separates the rotating member 65 from the inside and outside of the closed space 54 of the cutter frame 30.
The rotating member 6 is disposed in the vicinity of the closed space 54.
Since the rotary drive mechanism 80 for driving the rotation of the rotary member 5 is provided, the rotary member 65 can be reliably driven to rotate by the rotary drive means 80. Since the seal members 70a and 70b are provided on the frame member 70 and the rotating member 65, the frame member 7
It is possible to reliably prevent water and earth and sand from flowing into the closed space 54 from the opening 71a.

In each of the cutter spokes 31 (32, 33), a plurality of drive shafts 7 connecting a plurality of rotating members 65 are provided.
9, one of the drive shafts 79 is rotated by the rotation drive mechanism 80, whereby the plurality of rotating members 65 are integrally driven to rotate, and the plurality of roller cutters 40 are moved to the projecting position and the retreating position. Since the switching can be easily and reliably performed at one time, the operation efficiency of switching the positions of the plurality of roller cutters 40 is increased, and the common rotary drive mechanism 80 can be applied, which is very advantageous in terms of cost. .

Since the locking member 85 for locking the rotating member 65 at a position corresponding to the projecting position of the roller cutter 40 is provided, by locking the rotating member 85 at a position corresponding to the projecting position of the roller cutter 40, The rotation member 85 is prevented from rotating by the excavation reaction force acting on the roller cutter 40, and the roller cutter 40 can be reliably held at the projecting position. Each cutter spoke 31 (3
In (2, 33), since the plurality of rotating members 65 are integrally connected, the rotation of one rotating member 65 is locked by the lock member 85, so that the entirety of the integrated rotating members 65 is increased. The rotation of can be locked.

The rotation drive mechanism 80 includes the worm wheel 8
1, a worm gear 82 and an electric motor 83, and a worm gear mechanism having a worm wheel 81 and a worm gear 82 provides a high reduction ratio.
3 can be applied as a small output, and as a result, it is easy to secure a space for arranging the electric motor 83 and to reduce the manufacturing cost. In a state where the electric motor 83 is not driven, the worm gear mechanism turns the rotating member. A locking action for preventing the 63 from rotating can be obtained.

The drive shaft 79 is provided with a pair of detected parts 90,
Since the detection sensor 91 capable of detecting the detected portion 90 is provided, the rotating member 65 can be reliably positioned at the position corresponding to the projecting position of the roller cutter 40 and the retracted position, and the roller cutter 40 can be moved to the projecting position. And the retreat position.

Next, a modification of the above embodiment will be described. 1) In the rotary drive mechanism 80, the worm wheel 81 and the worm wheel 81 may be omitted, and the electric motor 83 may be fixedly provided on the frame member 70 and directly connected to the drive shaft 79. Each cutter spoke 3
1 (32, 33), a plurality of roller cutters 40
When the plurality of rotating members 65 are integrally rotated, the drive shaft 7 extending from the outermost rotating member 65 is used.
9, an electric motor 83 is directly connected.

2) A plurality of rotation driving mechanisms 80 may be provided so that the rotation members 65 corresponding to the respective roller cutters 40 are independently driven to rotate. In this case, as in the above embodiment, a worm gear mechanism may be adopted, or an electric motor may be directly connected to the drive shaft 79. Further, it is of course possible to manually rotate the rotation member 65.

3) Like the roller cutter 40, the plurality of roller cutters 41 and 42 can be configured so that the positions can be switched between a projecting position and a retreating position. Also,
The overcut roller cutter 43 provided on the outer peripheral portion of the cutter frame 30 also has the same structure as described above, although the switching direction is different, and is configured to be switchable between the projecting position and the retreating position. Can be.

It should be noted that the cutter apparatus of the shield machine according to the above-described embodiment and modifications is merely an example, and the shield machine of the shield machine to which various modifications are added without departing from the gist of the present invention is described below. It goes without saying that the present invention is applicable.

[0065]

According to the cutter device of the shield machine according to the first aspect, when the rotating member is rotated, the roller shaft of the roller cutter eccentric with respect to the rotating axis of the rotating member is rotated. The roller cutter rotates about the dynamic axis, and is switched between a projecting position where the roller cutter is used for excavation and a retreating position retracted rearward from the projecting position. As described above, since the rotation of the rotation member is not hindered by the rotation of the rotation member and the excavated soil or the like, the roller cutter is moved over the projecting position and the retreating position. Switching can be performed easily and reliably.

In a cutter device applied when excavating a ground containing both a bedrock layer and a soil layer, a cutter frame is provided with both a plurality of roller cutters and a tooth cutter. The plurality of roller cutters to be excavated are configured to be switchable between the projecting position and the retreating position as described above, and the projecting position is set to a position where the roller cutter protrudes forward from the teeth cutter. The position can be set to a position where the roller cutter retracts behind the teeth cutter.

Therefore, when excavating a bedrock layer, by switching a plurality of roller cutters to the protruding positions, the plurality of tooth cutters are prevented from hindering or contributing to the excavation, and the plurality of roller cutters can be reliably connected. And when excavating sediment,
By switching multiple roller cutters to the retracted position, multiple tooth cutters can function reliably without excavating the multiple roller cutters. Excavation can be performed well, and wear of the roller cutter and the teeth cutter can be prevented as much as possible.

According to the cutter device of the shield machine according to the second aspect of the present invention, by rotating the rotating member, the roller cutter protrudes forward from the teeth cutter and retreats backward from the teeth cutter. It is possible to reliably switch between the retracted position and the retracted position, and the plurality of roller cutters are configured to be switchable between the projecting position and the retracted position. A similar effect is achieved.

According to the cutter device of the shield machine according to the third aspect, the rotating member is disposed near the frame member that separates the inside and the outside of the cutter frame, and the rotating member is driven to rotate inside the cutter frame. Since the rotation driving means is provided, the rotation member can be reliably driven to rotate by the rotation driving means provided inside the cutter frame.
The other effects are the same as those of the first or second aspect.

According to the fourth aspect of the present invention, a seal for preventing water or earth and sand from flowing into the inside of the cutter frame from the opening through which the drive shaft integrated with the rotating member is inserted into the frame member. Since the member is provided, the drive shaft is reliably driven to rotate by the rotation driving means inside the cutter frame in a state where water and earth and sand are prevented from flowing into the inside of the cutter frame from the opening by the seal member. can do. The other effects are the same as those of the third aspect.

According to the cutter device of the shield excavator of the fifth aspect, since the positioning means for positioning the rotating member at the position corresponding to the projecting position of the roller cutter and the position corresponding to the retreat position of the roller cutter are provided. In addition, the roller cutter can be reliably switched between the projecting position and the retreating position. The other effects are the same as those of the fourth aspect.

According to the cutter device of the shield excavator of the sixth aspect, since the locking means for locking the rotating member at the position corresponding to the projecting position of the roller cutter is provided, the excavation reaction force acting on the roller cutter is provided. Thus, the rotation member can be prevented from rotating, and the roller cutter can be reliably held at the projecting position. Other effects similar to those of the fourth or fifth aspect are exhibited.

According to a seventh aspect of the present invention, the rotary drive means includes a worm wheel provided on the drive shaft, a worm gear meshing with the worm wheel, and an electric drive for rotating the worm gear. Since a high reduction ratio can be obtained by the worm gear mechanism having the worm wheel and the worm gear, a small-sized electric drive can be applied, and as a result, it is easy to secure a space for arranging the electric drive, and the manufacturing cost is increased. Can also be reduced. In a state where the electric drive is not driven, a locking action for preventing the rotating member from rotating by the worm wheel and the worm gear can be obtained. The other effects are the same as those of the sixth aspect.

According to the cutter device of the shield machine according to the present invention, the rotary drive means has a drive source directly connected to the drive shaft and fixed to the frame member. It is simple, it is easy to secure a space for disposing the drive source, and it is advantageous in terms of manufacturing cost.
The other effects are the same as those of the sixth aspect.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a shield machine according to an embodiment.

FIG. 2 is a front view of the shield machine.

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

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

FIG. 5 is a front view of a main part of the cutter device.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 3 Cutter device 30 Cutter frame 40-43 Roller cutter 44 Teeth cutter 60 Roller shaft 65 Rotating member 70 Frame member 70a, 70b Seal member 79 Drive shaft 80 Rotary drive mechanism 81 Worm wheel 82 Worm gear 83 Electric motor 85 Lock Member 90 Detected part 91 Detection sensor

Claims (8)

[Claims] 1. A shield device for a shield machine in which a cutter frame is provided with a plurality of roller cutters, wherein a rotating member that supports a roller shaft on which the roller cutter is rotatably supported is provided, and the rotating member is a cutter. While being rotatably supported on the frame, the roller shaft is decentered with respect to the rotation axis of the rotation member, and by rotating the rotation member, the projecting position for excavating the roller cutter and the projecting position A cutter device for a shield excavator, wherein the cutter device is configured to be switchable over a retreat position retracted rearward. 2. A plurality of teeth cutters are mounted on the cutter frame, and by rotating the rotating member, a roller cutter projects forward from the teeth cutter and rearward from the teeth cutter. The cutter device for a shield machine according to claim 1, wherein the switching is performed over the retreat position. 3. The rotary member is provided near a frame member that separates the inside and the outside of the cutter frame, and a rotary drive unit that rotates the rotary member is provided inside the cutter frame. A cutter device for a shield machine according to claim 1 or 2. 4. A frame member having an opening through which a drive shaft integrated with a rotating member is inserted, and a seal member for preventing water and earth and sand from flowing into the cutter frame from the opening. The cutter device of a shield machine according to claim 3, wherein 5. The shield according to claim 4, further comprising positioning means for positioning the rotating member at a position corresponding to the projecting position of the roller cutter and at a position corresponding to the retracted position of the roller cutter. Excavator cutter device. 6. The cutter device for a shield machine according to claim 4, further comprising a lock unit for locking the rotating member at a position corresponding to a projecting position of the roller cutter. 7. The rotator according to claim 6, wherein the rotation drive means includes a worm wheel provided on the drive shaft, a worm gear meshing with the worm wheel, and an electric drive for rotating the worm gear. Equipment of a shield excavator. 8. The cutter device for a shield machine according to claim 6, wherein said rotary drive means has a drive source directly connected to said drive shaft and fixed to a frame member.