JP7192596B2 - Cutter bit device and cutter bit changer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter bit device and a cutter bit exchange device that are exchangeably attached to a cutter head of a shield machine.

A shield machine excavates a tunnel by excavating a front face (face) by rotating a cutter head mounted with a cutter bit while being driven forward by a shield jack.

If the cutter bit wears out during excavation of a tunnel and its excavation capacity is reduced, it is necessary to temporarily stop excavation and replace it with a new cutter bit. In recent years, there has been an increase in the number of construction projects in which a single shield machine is used to excavate long distances, and the frequency of replacing cutter bits is increasing.

There are several ways to replace cutter bits, such as constructing a pit for replacement work and pulling out the shield machine, or using ground improvement and pressurization to allow people to enter the face, but the replacement work is extremely burdensome. is time consuming and dangerous. Therefore, a technique has been proposed in which the cutter bit is replaced from behind the cutter head (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2004-197320

However, in the conventional technology, the operator is forced to perform complicated work such as screwing at multiple locations and attaching/detaching the cover member in a narrow working space. Although it is possible to use a robot instead of a worker, it is difficult to secure a work space because a complicated work is required, and a highly functional multi-joint robot with a large robot arm is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cutter bit device and a cutter bit changing device that can easily change a cutter bit in single-axis work.

In order to achieve the above object, the present invention provides a cutter bit device replaceably attached to a cutter head of a shield machine, which can be inserted from the rear side in the axial direction into an attachment hole formed in the cutter head. A cutter pedestal for supporting a cutter bit and a first male thread that is screwed into a first female thread formed in the mounting hole are formed on the outer circumference, and the cutter pedestal is attached to the cutter head by being tightened into the mounting hole. fixing the cutter base around the axis of the mounting hole by means of a first fixing member that is fixed in the radial direction, the circumferential direction, and the axial direction of the mounting hole, and a first fixing member that is fitted into the mounting hole from the rear side in the axial direction. a detent member, and a second fixing member having a second male thread formed on an outer periphery thereof to be screwed into a second female thread formed in the mounting hole, and preventing the detent member from falling off by tightening the detent member into the mounting hole; characterized by comprising
Further, in the present invention, the cutter pedestal has a cylindrical body that extends rearward when being inserted into the mounting hole, and the first fixing member includes an outer peripheral portion formed with the male screw and an outer peripheral portion of the cutter pedestal. A penetrating portion through which the cylindrical body penetrates, and a connecting portion that connects the outer peripheral portion and the penetrating portion may be provided.
Further, in the present invention, a detent processed portion is formed at the free end of the cylindrical body, and a fitted portion to which the detent processed portion is fitted is formed in the detent member. good.
Further, in the present invention, a communication hole may be formed in each of the first fixing member and the second fixing member to communicate a front surface and a rear surface of the cutter head when the cutter head is attached to the attachment hole.
The present invention also provides a cutter bit replacement device for replacing the cutter bit device described above, comprising: a first gripping portion that grips the cutter pedestal or the anti-rotation member; and the cutter gripped by the first gripping portion. With the pedestal inserted into the mounting hole, the gripped first fixing member is rotated around the axis of the mounting hole to be tightened or loosened in the mounting hole, and the first fixing member gripped by the first gripping portion is removed. a second gripping portion that rotates the gripped second fixing member around the axis of the mounting hole and tightens or loosens the gripped second fixing member in the mounting hole in a state where the anti-rotation member is fitted in the mounting hole; and a cylinder for extending and contracting a rod, to which a gripping portion and a second gripping portion are attached to open ends, from a rear side of the mounting hole in the axial direction.

According to the present invention, it is possible to easily replace the cutter bit by uniaxial work from the rear side of the mounting hole, and it is possible to reduce the size of the cutter bit replacement device.

1 is a longitudinal sectional view of a shield machine equipped with an embodiment of a cutter bit device according to the present invention; FIG. It is the front view which looked at the cutter head shown in FIG. 1 from the front. 1. It is a four-sided view which shows the state with which the cutter bit apparatus was mounted|worn with the mounting hole of the cutter head shown in FIG. 4A and 4B are four views showing the configuration of a mounting hole shown in FIG. 3; FIG. 4 is a four-sided view showing the configuration of the cutter base shown in FIG. 3. FIG. FIG. 4 is a two-sided view showing configurations of a first fixing member, a detent member, and a second fixing member shown in FIG. 3 ; FIG. 2 is a side view showing the configuration of a cutter bit exchanging device used for exchanging the cutter bit device according to the present invention; FIG. 8 is a diagram showing the configuration of the jig device shown in FIG. 7; FIG. 8 shows a state in which the jig device shown in FIG. 7 grips the anti-rotation member and the second fixing member; FIG. 8 shows a state in which the jig device shown in FIG. 7 grips the cutter base 12 and the first fixing member 13. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a cutter bit device and a cutter bit changing device according to the present invention will be described with reference to the accompanying drawings. It should be noted that, in the following embodiments, the same reference numerals are given to the structures showing the same functions, and the description thereof will be omitted as appropriate.

A cutter bit device 10 of the present embodiment is arranged in a cutter head 2 of a shield machine 1, as shown in FIGS. Referring to FIG. 1, the shield machine 1 has a cylindrical front section 3 and a rear section 4 having substantially the same diameter, which are connected by a connecting shaft (not shown). A rotating ring 5 is rotatably supported on the front portion of the front body portion 3 via a bearing portion such as a bearing. The rotating ring 5 is connected to the cutter head 2 via a connecting beam.

A plurality of cutter turning motors 6 for rotating a rotating ring 5 are mounted on the front body 3 . As a result, when the cutter turning motor 6 is rotationally driven, the cutter head 2 is rotated via the connecting beam.

A partition wall 7 positioned behind the cutter head 2 is provided in the front body portion 3 , and a chamber 8 filled with excavated earth and sand is formed between the cutter head 2 and the partition wall 7 . The excavated earth and sand filled in the chamber 8 is conveyed rearward through the front body section 3 and the rear body section 4 by the screw conveyor 9 .

Referring to FIG. 2, cutter bit devices 10 are replaceably mounted in a plurality of mounting holes 21 formed in the cutter head 2 . Hereinafter, the direction of excavation of the tunnel is defined as the forward direction, the direction of rotation of the cutter head 2 is defined as the direction of rotation, and the direction orthogonal to the direction of rotation is defined as the radial direction.

Referring to FIG. 3, the cutter bit device 10 includes a roller cutter 11 having a cutter bit, a cutter pedestal 12 that rotatably supports the roller cutter 11, and a first cutter that fixes the cutter pedestal 12 to a mounting hole 21 from the rear side. A fixing member 13, a rotation preventing member 14 for preventing rotation of the cutter pedestal 12 around the axis of the mounting hole 21, and a second fixing member 15 for preventing the rotation preventing member 14 from coming off. Although the roller cutter 11 is used as the cutter bit in this embodiment, the cutter bit may be a tooth bit, shell bit, or other shaped bit. In addition, in FIG. 3, (a) is a front view seen from the front side, (b) is a longitudinal sectional view seen from the winding direction, (c) is a rear view seen from the rear side, ( d) is a longitudinal sectional view seen from the radial direction.

The mounting hole 21 is a through hole penetrating from the front surface to the chamber 8, and has a diameter through which the roller cutter 11 supported by the cutter pedestal 12 penetrates from the rear side. Referring to FIG. 4, the mounting hole 21 includes an engaged surface 22 with which the cutter pedestal 12 is engaged from the rear side, a female screw 23 that is screwed with the first fixing member 13, and a rotation prevention member 14 on the rear side. A fitting groove 24 to be fitted through and a female thread 25 to be screwed with the second fixing member 15 are formed in order from the front side. In addition, in FIG. 4, (a) is a front view seen from the front side, (b) is a longitudinal sectional view seen from the winding direction, (c) is a rear view seen from the rear side, ( d) is a longitudinal sectional view seen from the radial direction.

Referring to FIG. 5 , the cutter pedestal 12 has a pair of supporting portions 121 for rotatably supporting the rotating shaft 111 of the roller cutter 11 and a pair of supporting portions 121 . It has a base portion 122 formed with an engaging surface 122 a that engages with the surface 22 from the rear side, and a cylindrical rod portion 123 extending from the base portion 122 in the direction opposite to the support portion 121 . 5, (a) is a front view seen from the support portion 121 side, (b) is a side view seen from the direction of the rotating shaft 111 of the roller cutter 11, and (c) is the support portion 121. is a rear view seen from the opposite side, and (d) is a side view seen from a direction orthogonal to the rotating shaft 111 of the roller cutter 11.

The rod portion 123 functions as a grasping portion that is grasped when the roller cutter 11 is inserted from the rear side to a predetermined position in the mounting hole 21 . Further, the free end of the rod portion 123 is formed with a detent processed portion 123a. In this embodiment, an example of I-cut processing is shown as the anti-rotation processing portion 123a, but other shapes such as D-cut processing may be adopted.

Referring to FIGS. 6A and 6B, the first fixing member 13 has a cylindrical outer peripheral portion 132 with a male thread 131 formed on the outer peripheral surface thereof, and by screwing it with the female thread 23 of the mounting hole 21, It is a member that fixes the cutter pedestal 12 inserted into the mounting hole 21 from the rear side. The female thread 23 and the male thread 131 are preferably trapezoidal threads. In addition, in FIG. 6, (a), (c) and (e) are side views, and (b), (d) and (f) are front views.

The inner peripheral portion of the first fixing member 13 has a through hole through which the rod portion 123 of the cutter pedestal 12 passes, and the through portion supports the cutter pedestal 12 in the circumferential direction and radial direction in the mounted state shown in FIG. 133 are provided. The central axis of the first fixing member 13 and the central axis of the rod portion 123 coincide with each other when the rod portion 123 penetrates through the penetrating portion 133 . As a result, the first fixing member 13 can be tightened or loosened with respect to the mounting hole 21 with the rod portion 123 penetrating through the penetrating portion 133 .

The outer peripheral portion 132 and the through portion 133 are connected to the connecting portion 134 . The connecting portion 134 also functions as a grip when tightening or loosening the first fixing member 13 with respect to the mounting hole 21 . A communication hole 135 is provided between the outer peripheral portion 132 other than the connecting portion 134 and the through portion 133 to communicate the front surface and the rear surface (chamber 8 ) of the cutter head 2 when the cutter head 2 is mounted in the mounting hole 21 .

6(c) and 6(d), the anti-rotation member 14 is a plate-like member having a fitted portion 141 to which the anti-rotation processed portion 123a formed on the rod portion 123 of the cutter base 12 is fitted. It is a member. Both ends of the anti-rotation member 14 function as fitting portions 142 that fit into the fitted grooves 24 of the mounting hole 21 from the rear side. With this configuration, the rod portion 123 (cutter base 12) is fixed around the axis by the anti-rotation member 14 in the mounted state shown in FIG.

6(e) and 6(f), the second fixing member 15 has a cylindrical outer peripheral portion 152 with a male thread 151 formed on the outer peripheral surface thereof, and is attached by screwing it with the female thread 25 of the attachment hole 21. The anti-rotation member 14 fitted in the fitted groove 24 is fixed in the hole 21 from the rear side to prevent it from coming off. Female thread 25 and male thread 151 are preferably formed of trapezoidal threads.

A through portion 153 having a through hole for accessing the anti-rotation member 14 is provided on the inner peripheral portion of the second fixing member 15 . The outer peripheral portion 152 and the through portion 153 are connected to the connecting portion 154 . The connecting portion 154 also functions as a grip when tightening or loosening the second fixing member 15 with respect to the mounting hole 21 . A communication hole 155 is provided between the outer peripheral portion 152 other than the connecting portion 154 and the through portion 153 to communicate the front surface and the rear surface (chamber 8 ) of the cutter head 2 when the cutter head 2 is attached to the attachment hole 21 .

The replacement work of the cutter bit device 10 is performed using a cutter bit replacement device 30 shown in FIG. The cutter bit changing device 30 includes a material lock 31 provided in the partition wall 7, a cylinder 33 having a rod 32 extending and contracting toward the mounting hole 21 via the material lock 31, and an open end of the rod 32. and a jig device 40 .

The material lock 31 is an airtight chamber having an opening 311 communicating with the chamber 8 and an opening 312 communicating with the front body 3. A first airtight door 313 for opening and closing the opening 311 and a second airtight door 313 for opening and closing the opening 312 A hermetic door 314 is provided respectively.

The material lock 31 is provided at any position in the circumferential direction according to the radial position of the replaceable cutter bit device 10 . Therefore, one material lock 31 can be used to replace cutter bit devices 10 having substantially the same radial position by rotating the cutter head 2 for alignment. Also, the material lock 31 is preferably provided at a position shifted in the left-right direction with respect to the central axis of the cutter head 2, and an opening 312 communicating with the front body portion 3 is formed in the upper portion. In this case, attachment/detachment of the jig device 40 to/from the rod 32 and attachment/detachment of the cutter bit device 10 to/from the jig device 40 can be performed by using a hanging tool. Furthermore, it is more preferable to provide a plurality of sets of openings 312 and first airtight doors 313 at different positions in the radial direction, and to configure the material lock 31 to be movable in the radial direction.

The cylinder 33 is detachably attached to the front body portion 3 so that the central axis of the mounting hole 21 and the central axis of the rod 32 are aligned.

Referring to FIG. 8, the jig device 40 includes a first gripping portion 50 that grips the cutter pedestal 12 and the anti-rotation member 14 and mounts them at predetermined positions in the mounting hole 21, a first fixing member 13 and a second fixing member. A camera 70 and a second grip portion 60 for gripping the camera 15 and mounting it at a predetermined position in the mounting hole 21 . In addition, in FIG. 8, (a) is a front view seen from the front side, (b) is a side view, and (c) is a partial cross-sectional view of (b).

The attachment and detachment of the cutter bit device 10 is divided into two parts: a first attachment/detachment operation of attaching and detaching the cutter base 12 and the first fixing member 13, and a second attachment/detachment operation of attaching and detaching the detent member 14 and the second fixing member 15. done. Therefore, the first attachment/detachment work is performed in a state in which the first gripping portion 50 grips the cutter pedestal 12 and the second gripping portion 60 grips the first fixing member 13 . The second attachment/detachment operation is performed with the first gripping portion 50 gripping the anti-rotation member 14 and the second gripping portion 60 gripping the second fixing member 15 .

The first gripping portion 50 includes an arm portion 51 that grips the rod portion 123 of the cutter base 12 and the first fixing member 13, an arm driving portion 52 that drives the arm portion 51, and is fixed to the free end of the rod 32. A rotary drive unit 53 that drives the drive unit 52 to rotate around the axis of the rod 32 is provided.

The arm portion 51 has a curved shape capable of gripping the rod portion 123 of the cutter pedestal 12 with its central axis aligned with the rod 32 , and the anti-rotation processing portion 123 a of the rod portion 123 and the first fixing member 13 are connected to the rod portion 51 . It has a planar shape that is held in a fixed state around the axis of the portion 123 .

The second gripping portion 60 is configured in a donut shape so as to cover the outer periphery of the first gripping portion 50, and is configured with an arm portion 61 that grips the connecting portion 134 of the first fixing member 13 and the connecting portion 154 of the second fixing member 15. , an arm driving portion 62 for driving the arm portion 61, a rotation driving portion 63 fixed to the free end of the rod 32 and driving the arm driving portion 62 to rotate about the axis of the rod 32, the arm driving portion 62 and the rotation driving portion. 63 and expands and contracts at the same pitch as the internal threads 23 and 25 and the external threads 131 and 151 according to the rotation of the arm drive section 62 .

The camera 70 captures images from the chamber 8 side of the cutter bit device 10 mounted in the mounting hole 21, so that the mounting state of the cutter bit device 10, that is, in particular, the connection portion 134 of the first fixing member 13 and the second fixing member 13 can be viewed. It functions as a mounting state detection section that detects the angle of the connecting section 154 of the member 15 . In addition, in this embodiment, an example in which the camera 70 is attached to the first grip portion 50 is shown, but there is no limit to the location where the camera 70 is attached. Also, a magnetic sensor or an optical sensor may be employed as the mounting state detection unit.

Next, a procedure for replacing the cutter bit device 10 will be described in detail with reference to FIGS. 9 and 10. FIG.

The replacement work of the cutter bit device 10 is performed after the excavated earth and sand in the chamber 8 are replaced with pressure-adjusted water (water adjusted to a pressure against the earth and water pressure of the ground in another plant or the like). While the excavated earth and sand filled in the chamber 8 are carried out by the screw conveyor 9, the pressure-adjusted water is injected into the chamber 8 from a water injection pipe (not shown) to replace the excavated earth and sand in the chamber 8 with the pressure-adjusted water.

First, a procedure for removing the cutter bit device 10 from the mounting hole 21 will be described with reference to FIG.

The cutter head 2 is rotated to move the cutter bit device 10 to be replaced to a position facing the opening 311 of the material lock 31 . Also, the cylinder 33 is mounted so that the central axis of the mounting hole 21 in which the cutter bit device 10 to be replaced is mounted is aligned with the central axis of the rod 32, and the free end of the rod 32 extends into the material lock 31. . The through hole of the material lock 31 through which the rod 32 passes is waterproofed by a sealing member (not shown).

Next, the second airtight door 314 is opened, the jig device 40 is introduced into the material lock 31 through the opening 312 and attached to the open end of the rod 32 .

Next, after closing the second airtight door 314, the material lock 31 is filled with pressure-adjusted water from a water pipe (not shown).

Next, the jig device 40 is introduced into the chamber 8 through the opening 311 by opening the first airtight door 313 and driving the cylinder 33 to extend the rod 32 . By detecting the mounted state of the cutter bit device 10 with the camera 70, the orientation of the arm portion 51 is adjusted by the rotational driving of the rotational driving portion 53, and the orientation of the arm portion 61 is adjusted by the rotational driving of the rotational driving portion 63. 9(a) and 9(b), the arm driving portion 52 is driven so that the arm portion 51 grips the anti-rotation member 14, and the arm driving portion 62 is driven so that the arm portion 61 moves the second The connecting portion 154 of the fixing member 15 is gripped. In FIG. 9, (a) is a front view, and (b) and (c) are side views.

Next, as shown in FIG. 9( c ), while the connecting portion 154 of the second fixing member 15 is gripped by the arm portion 61 , the rotation driving portion 63 is driven to rotate so that the second fixing member is removed from the mounting hole 21 . 15 is loosened.

Next, by driving the cylinder 33 and contracting the rod 32, the anti-rotation member 14 and the second fixing member 15 are recovered in the material lock 31, and after closing the first airtight door 313, the inside of the material lock 31 The pressure regulating water is drained from a drain pipe (not shown).

Next, the second airtight door 314 is opened, and the arm driving section 52 is driven to release the anti-rotation member 14 from being gripped by the arm section 51. The grip is released, and the anti-rotation member 14 and the second fixing member 15 are carried out of the material lock 31 through the opening 312 .

Next, after closing the second airtight door 314, the material lock 31 is filled with pressure-adjusted water from a water pipe (not shown).

Next, the jig device 40 is introduced into the chamber 8 through the opening 311 by opening the first airtight door 313 and driving the cylinder 33 to extend the rod 32 . By detecting the mounted state of the cutter bit device 10 with the camera 70, the orientation of the arm portion 51 is adjusted by the rotational driving of the rotational driving portion 53, and the orientation of the arm portion 61 is adjusted by the rotational driving of the rotational driving portion 63. 10A and 10B, the arm driving portion 52 is driven to grip the rod portion 123 of the cutter pedestal 12 with the arm portion 51, and the arm driving portion 62 is driven to move the arm portion 61. to grip the connecting portion 134 of the first fixing member 13 . In FIG. 10, (a) is a front view, and (b) and (c) are side views.

Next, as shown in FIG. 10( c ), while the connecting portion 134 of the first fixing member 13 is gripped by the arm portion 61 , the rotation driving portion 63 is driven to rotate so that the first fixing member is removed from the mounting hole 21 . 13 is loosened.

Next, by driving the cylinder 33 and contracting the rod 32, the cutter pedestal 12 (roller cutter 11) and the first fixing member 13 are recovered in the material lock 31, and after closing the first airtight door 313, the material The pressure-adjusting water in the lock 31 is drained from a drain pipe (not shown).

Next, the second airtight door 314 is opened, the arm driving section 52 is driven to release the grip of the rod section 123 by the arm section 51, and the arm driving section 62 is driven to grip the connecting section 154 by the arm section 61. , and the cutter pedestal 12 (roller cutter 11 ) and the first fixing member 13 are carried out of the material lock 31 through the opening 312 . This completes the work of removing the cutter bit device 10 .

Next, a procedure for attaching the cutter bit device 10 to the attachment hole 21 will be described with reference to FIG.

The first fixing member 13 is carried into the material lock 31 through the opening 312, and the arm driving section 62 is driven to connect the first fixing member 13 with the arm section 61 as shown in FIGS. After gripping the part 134, the cutter pedestal 12 replaced with the new roller cutter 11 is carried into the material lock 31, and the arm driving part 52 is driven to grip the rod part 123 of the cutter pedestal 12 with the arm part 51. . Note that the cutter pedestal 12 and the first fixing member 13 may be reused.

Next, after closing the second airtight door 314, the material lock 31 is filled with pressure-adjusted water from a water pipe (not shown).

Next, the cutter pedestal 12 and the first fixing member 13 are introduced into the chamber 8 through the opening 311 by opening the first airtight door 313 and driving the cylinder 33 to extend the rod 32 . By further extending the rod 32 by driving the cylinder 33, the roller cutter 11 and the cutter pedestal 12 are inserted into the mounting hole 21, and the engaging surface 122a of the cutter pedestal 12 is aligned with the engaged surface 22 of the mounting hole 21. Engage. Thereby, the roller cutter 11 and the cutter base 12 are positioned within the mounting hole 21 .

Next, as shown in FIG. 10( b ), while the connecting portion 134 of the first fixing member 13 is gripped by the arm portion 61 , the rotation driving portion 63 is driven to rotate so that the first fixing member is inserted into the mounting hole 21 . Tighten 13. After that, the arm drive section 52 is driven to release the grip of the rod section 123 by the arm section 51 , and the arm drive section 62 is driven to release the grip of the connecting section 134 by the arm section 61 . Thereby, the roller cutter 11 and the cutter base 12 are fixed in the mounting hole 21 in the axial direction.

Next, by driving the cylinder 33 and contracting the rod 32, the jig device 40 is returned into the material lock 31, and after closing the first airtight door 313, the pressure adjustment water in the material lock 31 is drained (not shown). Drain the pipe.

Next, the second airtight door 314 is opened, the second fixing member 15 is carried into the material lock 31 through the opening 312, and the arm driving section 62 is driven as shown in FIGS. After the connecting portion 154 of the second fixing member 15 is gripped by the arm portion 61, the anti-rotation member 14 is carried into the material lock 31, and the arm driving portion 52 is driven to grip the anti-rotation member 14 by the arm portion 51. Let Note that the anti-rotation member 14 and the second fixing member 15 may be reused.

Next, after closing the second airtight door 314, the material lock 31 is filled with pressure-adjusted water from a water pipe (not shown).

Next, by opening the first airtight door 313 and driving the cylinder 33 to extend the rod 32 , the anti-rotation member 14 and the second fixing member 15 are introduced into the chamber 8 through the opening 311 . By further extending the rod 32 by driving the cylinder 33 , the anti-rotation member 14 and the second fixing member 15 are inserted into the mounting hole 21 , and the rod of the cutter pedestal 12 is inserted into the fitted portion 141 of the anti-rotation member 14 . A detent processed portion 123a formed on the portion 123 is fitted. Thereby, the roller cutter 11 and the cutter base 12 are fixed in the axial direction.

Next, as shown in FIG. 9( b ), while the connecting portion 154 of the second fixing member 15 is gripped by the arm portion 61 , the rotation driving portion 63 is driven to rotate so that the second fixing member is inserted into the mounting hole 21 . Tighten 15. After that, the arm driving portion 52 is driven to release the gripping of the anti-rotation member 14 by the arm portion 51 , and the arm driving portion 62 is driven to release the gripping of the connecting portion 154 by the arm portion 61 . As a result, the anti-rotation member 14 is fixed in the mounting hole 21 in the axial direction and is prevented from falling off.

Next, by driving the cylinder 33 and contracting the rod 32, the jig device 40 is returned into the material lock 31, and after closing the first airtight door 313, the pressure adjustment water in the material lock 31 is drained (not shown). Drain the pipe. Then, the second airtight door 314 is opened, the jig device 40 is removed, the cylinder 33 is removed, and the installation work of the cutter bit device 10 is completed.

As described above, the present embodiment is a cutter bit device 10 that is replaceably attached to the cutter head 2 of the shield machine 1. A cutter pedestal 12 that supports a roller cutter 11, which is a cutter bit, and a male thread 131 that is screwed into a female thread 23 formed in the mounting hole 21 are formed on the outer periphery of the mounting hole 21. A first fixing member 13 that fixes the cutter pedestal 12 in the radial direction, the circumferential direction, and the axial direction of the cutter head 2 by fitting the cutter pedestal 12 into the mounting hole 21 from the rear side in the axial direction. 21 and a male thread 151 screwed into the female thread 25 formed in the mounting hole 21 are formed on the outer circumference, and the detent member 14 is prevented from coming off by tightening the mounting hole 21. and a second fixing member 15 .
With this configuration, the roller cutter 11 can be easily replaced by a uniaxial operation from the rear side of the mounting hole 21 .

Further, in this embodiment, the cutter base 12 has a rod portion 123 as a cylindrical body extending rearward when inserted into the mounting hole 21, and the first fixing member 13 has an outer peripheral portion 132 formed with a male screw 131. and a through portion 133 through which the rod portion 123 of the cutter pedestal 12 passes;
A connection portion 134 that connects the outer peripheral portion 132 and the through portion 133 is provided.
With this configuration, fixing of the cutter pedestal 12 to the mounting hole 21 in the radial direction, the circumferential direction, and the axial direction of the cutter head 2 can be performed in one operation procedure.

Further, in the present embodiment, the free end of the rod portion 123 is formed with a detent processed portion 123a, and the detent member 14 is formed with a fitted portion 141 into which the detent processed portion 123a is fitted. ing.
With this configuration, fixing of the cutter pedestal 12 to the mounting hole 21 around the axis of the mounting hole 21 can be performed in one operation procedure.

Further, in the present embodiment, the first fixing member 13 and the second fixing member 15 are provided with communication holes 135 and 155, respectively, which communicate the front surface and the rear surface (chamber 8) of the cutter head 2 when being attached to the attachment hole 21. formed.
With this configuration, the mounting hole 21 can be used as a path for guiding the excavated earth and sand to the chamber 8, and the excavation efficiency can be improved.

Further, the present embodiment is a cutter bit exchanging device 30 for exchanging the cutter bit device 10, and includes a first gripping portion 50 that grips the cutter base 12 or the anti-rotation member 14, and a With the cutter pedestal 12 inserted into the mounting hole 21 , the gripped first fixing member 13 is rotated around the axis of the mounting hole 21 to tighten or loosen the mounting hole 21 , and is gripped by the first gripping portion 50 . a second gripping portion 60 that rotates the gripped second fixing member 15 about the axis of the mounting hole 21 to tighten or loosen it in the mounting hole 21 in a state where the anti-rotation member 14 is fitted in the mounting hole 21; The first gripping portion 50 and the second gripping portion 60 are provided with a cylinder 33 for axially expanding and contracting the rod 32 attached to the open end thereof from the rear side of the mounting hole 21 .
With this configuration, the roller cutter 11 can be easily replaced by single-axis work from the rear side of the mounting hole 21, and the size of the cutter bit replacement device 30 can be reduced.

The present invention has been described above based on the embodiments. It should be understood by those skilled in the art that this embodiment is an example, and that various modifications can be made to the combination of each component, etc., and that such modifications are also within the scope of the present invention. For example, the type of the shield construction method and the type of the shield machine 1 (earth pressure type, muddy water type, presence/absence of bending, etc.) are not limited.

1 Shield Machine 2 Cutter Head 3 Front Body 4 Rear Body 5 Rotating Ring 6 Cutter Turning Motor 7 Partition Wall 8 Chamber 9 Screw Conveyor 10 Cutter Bit Device 11 Roller Cutter 12 Cutter Base 13 First Fixing Member 14 Whirl-stop Member 15 Second 2 Fixing member 21 Mounting hole 22 Engaged surface 23 Female thread 24 Fitting groove 25 Female thread 30 Cutter bit changing device 31 Material lock 32 Rod 33 Cylinder 40 Jig device 50 First gripping portion 51 Arm portion 52 Arm driving portion 53 Rotation Drive portion 60 Second grip portion 61 Arm portion 62 Arm drive portion 63 Rotational drive portion 64 Extension/contraction portion 70 Camera 111 Rotating shaft 121 Support portion 122 Base portion 122a Engagement surface 123 Rod portion 123a Detent processing portion 131 Male screw 132 Peripheral portion 133 Penetration portion 134 Connection portion 135 Communication hole 141 Fitted portion 142 Fitting portion 151 Male screw 152 Peripheral portion 153 Penetration portion 154 Connection portion 155 Communication holes 311, 312 Opening 313 First airtight door 314 Second airtight door

Claims (5)

A cutter bit device replaceably attached to a cutter head of a shield machine,
a cutter pedestal for supporting a cutter bit configured to be insertable from the rear side in the axial direction into a mounting hole formed in the cutter head;
A first male thread is formed on the outer periphery to be screwed into a first female thread formed in the mounting hole, and the cutter base is fixed in the radial direction, the circumferential direction, and the axial direction of the cutter head by being tightened to the mounting hole. a first fixing member to
a detent member that fixes the cutter pedestal around the axis of the mounting hole by being fitted into the mounting hole from the rear side in the axial direction;
a second fixing member having a second male thread formed on an outer periphery thereof to be screwed into a second female thread formed in the mounting hole, and preventing the detent member from falling off by being tightened to the mounting hole; A cutter bit device characterized by: The cutter base is
A columnar body extending rearward when inserted into the mounting hole,
The first fixing member is
an outer peripheral portion on which the first male screw is formed;
a penetrating portion through which the cylindrical body of the cutter base penetrates;
The cutter bit device according to claim 1, further comprising a connecting portion that connects the outer peripheral portion and the through portion. A detent processed portion is formed at the free end of the cylindrical body,
3. The cutter bit device according to claim 2, wherein the anti-rotation member is formed with a fitted portion into which the anti-rotation processed portion is fitted. 3. The first fixing member and the second fixing member are formed with communication holes for communicating the front surface and the rear surface of the cutter head when the cutter head is mounted in the mounting hole. cutter bit device. A cutter bit replacement device for replacing the cutter bit device according to any one of claims 1 to 3,
a first gripping portion that grips the cutter pedestal or the anti-rotation member;
With the cutter pedestal gripped by the first gripping portion inserted into the mounting hole, the gripped first fixing member is rotated around the axis of the mounting hole to tighten or loosen the mounting hole. and rotating the gripped second fixing member around the axis of the mounting hole to fasten it to the mounting hole, or a second gripping portion to be loosened;
A cutter bit changing device, comprising: a cylinder for extending and retracting a rod, to which the first gripping portion and the second gripping portion are attached to open ends, from the rear side of the mounting hole in the axial direction.

Images