JPH10266784A - Movable bit device for shield machine - Google Patents

Abstract

(57) [Problem] To provide a movable bit device of a shield machine that has a simple structure and does not affect the excavating ability. SOLUTION: The shield excavator is installed at the outermost peripheral portion on the front face of a cutter face so as to be rotatable forward,
A cutting bit 25 configured such that a part thereof protrudes outwardly of the cutter face in an upright state, and the protruding portion is retracted inward of the cutter face in a state of being rotated forward.
And a telescopic cylinder 39 for rotating the cutting bit 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting bit used in a shield machine for excavating underground.

FIG. 7 is a sectional view of a conventional shield machine equipped with a slide ring. In the figure, 1 is the main body of the shield machine, 3 is a slide ring attached to the front of the main body 1 so as to be movable in the front-rear direction. It is a moving jack. Reference numeral 7 denotes a drive mechanism which is attached to the main body 1 and rotates a later-described excavation mechanism 11;
Is a central shaft rotated by the drive mechanism 7, and 11 is an excavation mechanism attached to the distal end side of the central shaft 9. The excavating mechanism 11 includes an inner peripheral portion 11 a fixed to the central shaft 9 and an inner peripheral portion 1.
Outer peripheral portion 1 slidably attached to 1a in the radial direction
1b.

[0003] One end 13 is attached to the inner peripheral portion 11a and the other end is attached to the outer peripheral portion 11b.
This is a telescopic jack that moves in the radial direction. 15a, 1
5b is a plurality of cutting bits attached to the front surfaces of the inner peripheral portion 11a and the outer peripheral portion 11b, respectively. In addition, the outer peripheral portion 1
Among the cutting bits attached to 1b, the cutting bit arranged at the outermost periphery is arranged at a position where a diameter larger than that of the main body 1 or the slide ring 3 can be cut to improve propulsion efficiency.

When excavating underground with the conventional shield excavator constructed as described above, the excavating mechanism 11 is rotated by rotating the center shaft 9 by the driving mechanism 7 in the state shown in FIG. To excavate the ground. When the underground connection of the tunnel is performed or when the cutting bits 15a and 15b are replaced, as shown in FIG. 8, the telescopic jack 13 is retracted to move the outer peripheral portion 11b toward the inner peripheral portion 11a.
Next, the movable jack 5 is extended to push the slide ring 3 toward the front side of the main body 1 so as to surround the outer peripheral portion 11b moved to the inner peripheral portion 11a side. In this state, the connection work between the tunnels and the replacement work of the cutting bits 15a and 15b are performed. In addition, without providing the slide ring 3,
There is also a shield excavator having a structure in which the excavating mechanism 11 is retracted and housed in the hood portion at the front of the main body 1, but also in this case, the structure and operation of the excavating mechanism 11 are the same as those described above.

[0005]

As described above, the structure in which the excavating mechanism 11 is composed of the inner peripheral portion 11a and the outer peripheral portion 11b and the outer peripheral portion 11b is moved to the inner peripheral portion 11a side is as follows.
There is a problem that the mechanism for moving the outer peripheral portion 11b becomes large-scale, the machining accuracy is required for the slide mechanism, the amount of machining is large, and the cost is increased. Also, it is difficult to attach a cutting bit to the sliding portion of the outer peripheral portion 11b with the inner peripheral portion 11a, and when the outer peripheral portion 11b is moved in the radially outward direction, the cutting function does not work because there is no cutting bit in this portion. There is also the problem of becoming sufficient.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a movable bit device of a shield machine which has a simple structure and does not affect the excavating ability.

[0007]

A movable bit device for a shield machine according to the present invention is installed on the outermost peripheral portion on the front face of a cutter face of the shield machine so as to be rotatable forward, and is mounted in an upright state. A cutting bit configured so that a part thereof protrudes outward of the cutter face, and the protruding portion is retracted inward of the cutter face in a state of being rotated forward, and a driving unit for rotating the cutting bit. It is provided with.

Further, in place of the driving means, an urging means for urging the cutting bit in the upright direction is provided.

Further, the shield excavator is installed at the outermost peripheral portion on the front face of the cutter face so as to be slidable in the radially inward and outward directions. And a driving means for moving the cutting bit, the cutting bit being configured to retract into the diameter of the cutter face when the cutting bit is moved.

[0010] Further, the cutting bit is arranged on a side surface of a cutter spoke forming a cutter face.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is an explanatory view of a main part of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. FIG. 1 shows only a part of the shield machine, but the configuration other than the excavation mechanism 20 is the same as the conventional one shown in FIG. In the drawing, reference numeral 20 denotes an excavating mechanism arranged in front of the slide ring 3, and the excavating mechanism 20 includes a plurality of cylindrical spokes 21 radially fixed to a central shaft 9 (not shown).
A plurality of cutting bits 2 fixed to the front surface of each spoke 21
3. It has a pair of movable bits 25 and 27 attached to the distal end side of each spoke 21. As shown in FIG. 2, the pair of movable bits 25 and 27 are arranged on both sides of the front surface of the spoke 21, and the back surfaces thereof are supported by support members 29 and 31 having an L-shaped cross section, respectively.
9 and 31 are connected by a rod 33. The rod 33 is rotatably attached to the spoke 21 and has a bracket 3 extending rearward on the rod.
5, 37 are attached.

Reference numeral 39 denotes a telescopic jack, and the telescopic rod 3
At the end of 9a, a horizontal bar 41 extending left and right around the telescopic rod 39a is attached. And the horizontal bar 41
Holes 35 provided in brackets 35 and 37
a, 37a so as to be rotatable.

Next, the operation of the present embodiment configured as described above will be described. When excavating the ground, the rod of the telescopic jack 39 is retracted as shown in FIG. In this state, the back sides of the support members 29 and 31 to which the movable bits 25 and 27 are attached are in contact with the front surfaces of the spokes 21, and the movable bits 25 and 27 are in an upright state. Next, when the underground connection of the tunnel or the replacement of the cutting bit is performed, the movable bit 25, 27 is moved forward by extending the rod of the telescopic jack 39 and rotating the rod 33, as shown in FIG. Rotate toward. As a result, the movable bits 25 and 27 fall forward, and the outer peripheral end thereof enters inside the outer peripheral end of the spoke 21. When the slide ring 3 is moved forward in this state, as shown in FIG.
The excavating mechanism 20 is housed inside the slide ring 3 without interfering with the excavating mechanisms 5 and 27.

As described above, according to the present embodiment, the projection of the cutting bit disposed on the outermost periphery can be retracted inward from the end of the spoke 21 by a very simple mechanism. Further, since the mounting position of the movable bit may be the same position as the normal one, there is no possibility that the cutting ability is reduced.

Embodiment 2 FIG. 4 is an explanatory view of another embodiment of the present invention, and FIG. 5 is a sectional view taken along line BB of FIG.
In the present embodiment, the movable bits 25 and 27 are arranged on both side surfaces of the spoke 21, and the other configuration is the same as that of the first embodiment, and the same operation and effect can be obtained.

Embodiment 3 In the first and second embodiments, the movable bits 25 and 27 arranged on the outermost periphery are
Is rotated so as not to interfere with the slide ring 3. However, in the third embodiment, as shown in FIG. Along the center axis.

In the figure, reference numeral 51 denotes a movable bit slidably mounted on the front surface of the spoke 21 via a support member 53. The movable bit 51 is configured such that a part thereof projects outward of the spoke 21 when the movable bit 51 moves toward the distal end of the spoke 21, and the projecting portion retracts inside the distal end of the spoke 21 when the movable bit 51 moves toward the proximal end of the spoke 21. Have been. A bracket 55 is attached to the back side of the support member 53 so as to project into the inside of the spoke 21. Reference numeral 57 denotes a telescopic jack installed inside the spoke 21, and the tip of the rod is connected to the bracket 55. Therefore, the movable bit 51 can be slid with respect to the spoke 21 by extending and contracting the rod of the extendable jack 57.

In this embodiment constructed as described above, the movable bit 51 is connected to the spoke 2 when excavating the ground.
The movable bit 51 is moved to the base end side of the spoke 21 when the underground connection of the tunnel or the exchange of the cutting bit is performed. Also in the present embodiment, similarly to the first embodiment, the protrusion of the cutting bit arranged at the outermost periphery can be retracted inward from the end of the spoke 21 by a simple mechanism.

In the first, second and third embodiments, a pair of movable bits are integrally moved to the left and right of the spoke 21 to avoid the slide ring 3. It is also possible to provide a movable mechanism on the wing. Further, in the above-described embodiment, an example in which the telescopic jack 39 is used as the movable mechanism has been described. However, the present invention is not limited to this, and a general method such as a rack and pinion method can be applied.

In place of the telescopic jack 39 shown in FIG. 1, a spring for constantly urging the brackets 35 and 37 downward may be provided. In this way, when the slide ring 3 is moved forward, the movable bit 2
5 is pushed forward by the slide ring 3 and pivots forward, so that the same operation and effect as those achieved by pivoting with the telescopic jack 39 can be obtained.

Even when the front excavating mechanism 20 is housed in the hood formed at the front of the main body 1 without providing the slide ring 3, the slide ring 3 is formed at the front of the main body 1. If it is regarded as a ring of the hood portion, it is the same as the case where the slide ring 3 is provided. In addition, here, the slide ring 3 has a strong ring-shaped image from the expression of a ring, but the present invention is not limited to such a ring-shaped ring, and the slide ring 3 may be an oval or rectangular ring. The purpose is to include. Further, the present invention is not limited to a ring, and can be applied to a semicircular hood shape.

[0022]

As described above in detail, according to the present invention, only the cutting bit arranged at the outermost periphery of the excavating mechanism is movable (rotated or slid), so that the slide ring has an extremely simple structure. Alternatively, it is possible to prevent interference with the hood at the front of the main body. In addition, since only the cutting bit located at the outermost periphery is equipped with a movable mechanism,
There is almost no restriction on the mounting arrangement of other cutting bits, and the excavating ability of the shield machine is not reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an operation explanatory diagram of one embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating another embodiment of the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is an explanatory diagram illustrating another embodiment of the present invention.

FIG. 7 is a sectional view of a conventional shield machine.

FIG. 8 is an operation explanatory view of the conventional shield machine shown in FIG. 7;

[Explanation of symbols]

 Reference Signs List 3 slide ring 20 excavation mechanism 21 cutter spoke 25 movable bit 35 bracket 39 telescopic cylinder

Claims (4)

[Claims] 1. A shield excavator is provided at an outermost peripheral portion of a front surface of a cutter face so as to be rotatable forward, a part of which protrudes outward from the cutter face in an upright state and rotates forward. A movable bit device for a shield machine, comprising: a cutting bit configured so that the protruding portion is retracted inward of the cutter face in a state in which the cutting bit is rotated; and driving means for rotating the cutting bit. 2. A movable bit device for a shield machine according to claim 1, further comprising an urging means for urging said cutting bit in an upright direction in place of said driving means. 3. A shield excavator is provided at the outermost peripheral portion on the front face of a cutter face so as to be slidable in a radially inward and outward direction. A movable bit device for a shield excavator, comprising: a cutting bit configured so that the protruding portion is retracted into the diameter of the cutter face when the cutting bit is moved; and a driving unit that moves the cutting bit. 4. The movable bit device for a shield machine according to claim 1, wherein the cutting bit is disposed on a side surface of a cutter spoke forming a cutter face.